"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:22824b37-1333-4610-9072-46bb06a172c2","http://resolver.tudelft.nl/uuid:22824b37-1333-4610-9072-46bb06a172c2","A critical assessment and summary on the low carbon energy pile technologies based on the life-cycle perspective: Challenges and prospects","Zhang, Linfeng (Southeast University); Han, Haozhe (The Hong Kong Polytechnic University); Li, Wenxin (Southeast University); Guo, Kewei (Southeast University); Yuan, Minglu (Southeast University); Liu, Zhengxuan (TU Delft Design & Construction Management; Hunan University)","","2024","Energy piles, a technology integrating the heat exchange component within building pile foundations for shallow geothermal energy utilization, have proven economically efficient. They outperform conventional ground source heat pumps by mitigating additional borehole costs and space requirements. This paper systematically examines low-carbon considerations and optimization measures throughout the planning, design, construction, and operation stages of energy piles, considering the entire lifecycle. Furthermore, this paper discusses potential challenges associated with decarbonizing energy piles, offering solutions based on case studies and environmental impact assessments. Through a comprehensive critical review and analysis of existing knowledge, this paper presents a systematic theory and methodology for optimal decarbonization of energy piles, serving as a valuable resource for building practitioners and researchers in this field. The findings not only contribute to a solid theoretical foundation but also provide technical support for the advancement and application of energy pile systems.","Building carbon emissions; Energy piles; Full life-cycle; Low carbonization; Optimize design; Shallow geothermal energy","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-08-01","","","Design & Construction Management","","",""
"uuid:c898a66e-b760-4528-aaa5-e82212694e09","http://resolver.tudelft.nl/uuid:c898a66e-b760-4528-aaa5-e82212694e09","Influence of fiber orientation on the mechanical responses of engineering cementitious composite (ECC) under various loading conditions","Tawfek, Abdullah M. (Shandong University; Sana'a University); Ge, Zhi (Shandong University); Yuan, Huaqiang (Shandong University); Zhang, Ning (Tsinghua University); Zhang, Hongzhi (Shandong University); Ling, Yifeng (Shandong University); Guan, Yanhua (Shandong University); Šavija, B. (TU Delft Materials and Environment)","","2023","The mechanical performance of engineered cementitious composite (ECC) depends greatly on fiber orientation and distribution. In this paper, the effect of fiber orientation on ECC's mechanical properties was investigated using two different casting methods: a flow-induced casting was used to enhance the fiber orientation within ECC mixture and compared with the conventional casting. The fiber orientation was quantified using scanning electron microscope (SEM) and image processing. Mechanical tests on the specimens with various fiber orientations were performed. The failure processes of ECC specimens under compression and tensile tests were analyzed using digital image correlation (DIC) technique. The proposed flow-induced casting enhanced the fiber alignment in the flow direction. Consequently, ECC's mechanical properties were significantly improved with more finer cracks under uniaxial loading. In conclusion, the proposed flow-induced casting can be adopted as an effective approach to improve fiber bridging efficiency in ECC.","Engineering cementitious composite; Fiber orientation; Mechanical behavior; Digital image correlation; Crack width","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Materials and Environment","","",""
"uuid:a8f337ce-885d-4262-af8a-13d3520a3724","http://resolver.tudelft.nl/uuid:a8f337ce-885d-4262-af8a-13d3520a3724","Fishing Behavior Detection and Analysis of Squid Fishing Vessel Based on Multiscale Trajectory Characteristics","Zhang, Fan (Wuhan University of Technology); Yuan, Baoxin (Wuhan University of Technology); Huang, L. (TU Delft Safety and Security Science; Wuhan University of Technology); Wen, Yuanqiao (Wuhan University of Technology); Yang, Xue (National Engineering Laboratory of Application Technology of Integrated Transportation Big Data); Song, R. (TU Delft Safety and Security Science); van Gelder, P.H.A.J.M. (TU Delft Safety and Security Science)","","2023","Accurate fishing activity detection from the trajectories of fishing vessels can not only achieve high-precision fishery management but also ensure the reasonable and sustainable development of marine fishery resources. This paper proposes a new method to detect fishing vessels’ fishing activities based on the defined local dynamic parameters and global statistical characteristics of vessel trajectories. On a local scale, the stop points and points of interest (POIs) in the vessel trajectory are extracted. Voyage extraction can then be conducted on this basis. After that, multiple characteristics based on motion and morphology on a global scale are defined to construct a logistic regression model for fishing behavior detection. To verify the effectiveness and feasibility of the method, vessel trajectory data, and fishing log data collected from Chinese ocean squid fishing vessels in Argentine waters in 2020 are integrated for fishing operation detection. Multiple evaluation metrics show that the proposed method can provide robust and accurate recognition results. Moreover, further analysis of the temporal and spatial distribution and seasonal changes in squid fishing activities in Argentine waters has been performed. A more refined assessment of the fishing activities of individual fishing vessels can also be provided quantitatively. All the results above can benefit the regulation of fishing activities.","fishing behavior; fishery management; statistical features of trajectory sequences; logistic regression; sliding window","en","journal article","","","","","","","","","","","Safety and Security Science","","",""
"uuid:b2e0d0d4-4583-4cdc-b58c-0669560f2652","http://resolver.tudelft.nl/uuid:b2e0d0d4-4583-4cdc-b58c-0669560f2652","Data Background-Based Test Development for All Interconnect and Contact Defects in RRAMs","Xun, H. (TU Delft Computer Engineering); Fieback, M. (TU Delft Computer Engineering); Yuan, S. (TU Delft Computer Engineering); Zhang, Ziwei (Student TU Delft); Taouil, M. (TU Delft Computer Engineering; CognitiveIC); Hamdioui, S. (TU Delft Quantum & Computer Engineering; CognitiveIC)","","2023","Resistive Random Access Memory (RRAM) is a potential technology to replace conventional memories by providing low power consumption and high-density storage. As various manufacturing vendors make significant efforts to push it to high-volume production and commercialization, high-quality and efficient test solutions are of great importance. This paper analyzes interconnect and contact defects in RRAMs, while considering the impact of the memory Data Background (DB), and proposes test solutions. The complete interconnect and contact defect space in a layout-independent RRAM design is defined. Exhaustive defect injection and circuit simulation are performed in a systematic manner to derive appropriate fault models, not only for single-cell and two-cell coupling faults, but also for multi-cell coupling faults where the DBs are important. The results show the existence of unique 3-cell and 4-cell coupling faults due to e.g., the sneak path in the array induced by defects. These unique faults cannot be detected with traditional RRAM test solutions. Therefore, the paper introduces a test generation method that takes into account the DB, which is able to efficiently detect all these faults; hence, further improving the fault/defect coverage in RRAMs.","RRAM; interconnect and contact defects; data background; fault models; test development","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-01-12","","Quantum & Computer Engineering","Computer Engineering","","",""
"uuid:6fab90fe-c63b-4628-b435-9e634a4ffa62","http://resolver.tudelft.nl/uuid:6fab90fe-c63b-4628-b435-9e634a4ffa62","Reverse Recovery Optimization of Multiepi Superjunction MOSFET Based on Tunable Doping Profile","Liu, Ke (Southern University of Science and Technology); Tan, C. (TU Delft Electronic Components, Technology and Materials; Southern University of Science and Technology); Li, Shizhen (Southern University of Science and Technology); Yuan, Wucheng (Southern University of Science and Technology); Liu, X. (TU Delft Electronic Components, Technology and Materials; Southern University of Science and Technology); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials); French, P.J. (TU Delft Bio-Electronics); Ye, H. (TU Delft Electronic Components, Technology and Materials; Southern University of Science and Technology); Wang, S. (TU Delft Bio-Electronics; Southern University of Science and Technology)","","2023","This paper proposes and simulates research on the reverse recovery characteristics of two novel superjunction (SJ) MOSFETs by adjusting the doping profile. In the manufacturing process of the SJ MOSFET using multilayer epitaxial deposition (MED), the position and concentration of each Boron bubble can be adjusted by designing different doping profiles to adjust the resistance of the upper half P-pillar. A higher P-pillar resistance can slow down the sweep out speed of hole carriers when the body diode is turned off, thus resulting in a smoother reverse recovery current and reducing the current recovery rate (d (Formula presented.) /d (Formula presented.)) from a peak to zero. The simulation results show that the reverse recovery peak current (I (Formula presented.)) of the two proposed devices decreased by 5% and 3%, respectively, compared to the conventional SJ. Additionally, the softness factor (S) increased by 64% and 55%, respectively. Furthermore, this study also demonstrates a trade-off relationship between static and reverse recovery characteristics with the adjustable doping profile, thus providing a guideline for actual application scenarios.","superjunction; MOSFET; doping profile; reverse recovery; body diode","en","journal article","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:34a60ef1-ec71-49e5-8593-eadda560bdf0","http://resolver.tudelft.nl/uuid:34a60ef1-ec71-49e5-8593-eadda560bdf0","Transversal optical singularity induced precision measurement of step-nanostructures","Dou, X. (TU Delft ImPhys/Pereira group; Shenzhen University); Zhou, Jiakang (Shenzhen University); Zhang, Yuquan (Shenzhen University); Min, Changjun (Shenzhen University); Pereira, S.F. (TU Delft ImPhys/Pereira group); Yuan, Xiaocong (Shenzhen University)","","2023","Optical singularities indicate zero-intensity points in space where parameters, such as phase, polarization, are undetermined. Vortex beams such as the Laguerre–Gaussian modes are characterized by a phase factor eilθ, and contain a phase singularity in the middle of its beam. In the case of a transversal optical singularity (TOS), it occurs perpendicular to the propagation, and its phase integral is 2π in nature. Since it emerges within a nano-size range, one expects that TOSs could be sensitive in the light-matter interaction process and could provide a great possibility for accurate determination of certain parameters of nanostructure. Here, we propose to use TOSs generated by a three-wave interference to illuminate a step nanostructure. After interaction with the nanostructure, the TOS is scattered into the far field. The scattering direction can have a relation with the physical parameters of the nanostructure. We show that by monitoring the spatial coordinates of the scattered TOS, its propagation direction can be determined, and as consequence, certain physical parameters of the step nanostructure can be retrieved with high precision.","","en","journal article","","","","","","","","","","","ImPhys/Pereira group","","",""
"uuid:159c99ea-b65c-4638-b189-cde385e71e12","http://resolver.tudelft.nl/uuid:159c99ea-b65c-4638-b189-cde385e71e12","Magnetic Coupling Based Test Development for Contact and Interconnect Defects in STT-MRAMs","Yuan, S. (TU Delft Team Bart De Schutter; IMEC-Solliance); Zhang, Z. (TU Delft Industrial Design Engineering); Fieback, M. (TU Delft Computer Engineering); Xun, H. (TU Delft Computer Engineering); Marinissen, E. J. (IMEC-Solliance); Kar, G. S. (IMEC-Solliance); Rao, S. (TU Delft Education and Student Affairs; IMEC-Solliance); Couet, S. (IMEC-Solliance); Taouil, M. (TU Delft Computer Engineering; CognitiveIC); Hamdioui, S. (TU Delft Computer Engineering; CognitiveIC)","","2023","The development of Spin-Transfer Torque Magnetic RAMs (STT-MRAMs) mass production requires high-quality test solutions. Accurate and appropriate fault modeling is crucial for the realization of such solutions. This paper targets fault modeling and test generation for all interconnect and contact defects in STT-MRAMs and shows that using the defect injection and circuit simulation for fault modeling without incorporating the impact of magnetic coupling will result in an incomplete set of fault models; hence, not obtaining accurate fault models. Magnetic coupling introduced by the stray field is an inherent property of STT-MRAMs and may foster the occurrence of additional memory faults. Not considering the magnetic coupling clearly will give rise to test escapes. The paper introduces a compact model for STT-MRAM that incorporates the intra- and inter-cell stray field, uses this model to derive the full set of fault models for interconnect and contact defects, and finally proposes an efficient test solution.","fault modeling; magnetic coupling; stray field; STT-MRAM; test development","en","conference paper","Institute of Electrical and Electronics Engineers (IEEE)","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2024-06-30","Industrial Design Engineering","","Team Bart De Schutter","","",""
"uuid:8646dc40-473d-4213-83d1-4f50a7921e91","http://resolver.tudelft.nl/uuid:8646dc40-473d-4213-83d1-4f50a7921e91","Theoretical investigation on the effect of volume fraction in the optical trapping of gold nanoparticles","Zhu, Z. (TU Delft ImPhys/Urbach group; Shenzhen University); Zhang, Yu Quan (Shenzhen University); Adam, A.J.L. (TU Delft ImPhys/Adam group); Min, Changjun (Shenzhen University); Urbach, Paul (TU Delft ImPhys/Urbach group); Yuan, Xiaocong (Shenzhen University)","","2023","Stable optical trapping of gold nanoparticles is essential and desirable because of its wide applications in nanotechnology. While several factors have been proposed to affect optical trapping stability, the sample's volume fraction during optical trapping has often been neglected. To address this, by utilizing the effective medium theory, we analyze the stability of optical trapping of a gold nanoparticle in human serum albumin solutions, HIV-1,virus solutions, and gold nanoparticle solutions in this article. Our comparative analysis of the optical force and potential on a single gold nanoparticle in solutions of varying volume fractions reveals that both parameters decrease with increasing volume fraction. This finding can aid in more effective control of gold nanoparticles in various applications.","Gold nanoparticle; Optical force; Optical potential well; Optical tweezer","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-11-09","","","ImPhys/Urbach group","","",""
"uuid:43849dd3-7559-4af9-a9df-c7e6f723dd0e","http://resolver.tudelft.nl/uuid:43849dd3-7559-4af9-a9df-c7e6f723dd0e","Nonlinear optical trapping effect with reverse saturable absorption","Zhu, Z. (TU Delft ImPhys/Adam group; Shenzhen University; Zhejiang Lab); Zhang, Y. (TU Delft ImPhys/Optics); Zhang, Shuoshuo (Shenzhen University); Adam, A.J.L. (TU Delft ImPhys/Adam group); Min, Changjun (Shenzhen University); Urbach, Paul (TU Delft ImPhys/Stallinga group); Yuan, Xiaocong (Shenzhen University; Zhejiang Lab)","","2023","Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers. With the gradual increase in optical intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise in sequence and thereby modulate the nonlinear properties of materials. In current nonlinear optical traps, however, the underlying physical mechanism is mainly confined within the SA regime because threshold values required to excite the RSA regime are extremely high. Herein, we demonstrate, both in theory and experiment, nonlinear optical tweezing within the RSA regime, proving that a fascinating composite trapping state is achievable at ultrahigh intensities through an optical force reversal induced through nonlinear absorption. Integrated results help in perfecting the nonlinear optical trapping system, thereby providing beneficial guidance for wider applications of nonlinear optics.","nonlinear optical tweezers; optical force; reverse saturable absorption","en","journal article","","","","","","","","","","","ImPhys/Adam group","","",""
"uuid:36a3fc08-0d3d-4429-bee4-831699c71f7b","http://resolver.tudelft.nl/uuid:36a3fc08-0d3d-4429-bee4-831699c71f7b","Evaluation of the fatigue properties for the long-term service asphalt pavement using the semi-circular bending tests and stereo digital image correlation technique","Cheng, Long (Southeast University); Zhang, Lei (Southeast University); Liu, X. (TU Delft Pavement Engineering); Yuan, Fang (Southeast University); Ma, Yang (Southeast University); Sun, Yinqing (Southeast University)","","2022","Reliable assessment of the fatigue resistance of asphalt pavement with a long-term service is critically crucial for the rational formulation of original pavement utilization strategies in reconstruction and expansion projects. Currently, the pavement performance evaluation indicators are mainly used to guide pavement preventive maintenance, and its applicability in reconstruction and expansion projects of the freeway is limited. This paper aims to propose an evaluation method of fatigue resistance of asphalt concrete utilizing semi-circular bending (SCB) tests and stereo digital image correlation (stereo-DIC) techniques. A total of 27 asphalt concrete cores were drilled from the three freeways (K84, K124, and K165) with a service life of more than 20 years, and the SCB specimens were produced to conduct the SCB fracture and fatigue tests. During the SCB test, the stereo-DIC technique was employed to monitor the evolution process of the strain distribution and crack length for the specimens. K-dimension tree neighbor-searching algorithm (K-d tree algorithm) was used to effectively measure the change of crack length corresponding to each fatigue load cycle. Meanwhile, the strain threshold of asphalt concrete crack initiation was determined by the bilinear softening cohesive zone model (CZM) to ensure the accuracy of the crack length calculated by the K-d tree algorithm. Furthermore, the relationship between crack growth rate and stress intensity, which was used to fit the Paris law parameters, was determined. The CZM and DIC results indicated that the strain threshold of asphalt concrete crack should be set as 2000 με when using the K-d tree algorithm to determine the crack length. With the stress ratio increase, the Paris law parameter A increased wavily, and the parameter n decreased steadily, while the threshold of the stress intensity factor increased steadily. The Paris law master curves could characterize the fatigue performance of various road sections at a wide load range. The residual fatigue life of K84, K124, K165 the road sections were 2.13E + 08, 3.57E + 08, and 1.02E + 07, respectively.","CZM; Fatigue performance; K-d tree algorithm; Paris law; SCB test","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Pavement Engineering","","",""
"uuid:25561465-a7f7-4781-89e0-ce9a005a254c","http://resolver.tudelft.nl/uuid:25561465-a7f7-4781-89e0-ce9a005a254c","Prediction of gas leakage and dispersion in utility tunnels based on CFD-EnKF coupling model: A 3D full-scale application","Cai, Jitao (China University of Mining and Technology (Beijing)); Wu, Jiansong (China University of Mining and Technology (Beijing)); Yuan, S. (TU Delft Safety and Security Science); Kong, Desheng (China University of Mining and Technology (Beijing)); Zhang, Xiaole (ETH Zürich)","","2022","Natural gas compartment accommodated in utility tunnels is beneficial in meeting the pressing demand of energy supply and sustainable urban environment. However, the leaking gas characterized by flammable and explosive can pose a huge threat to the safe operation of the utility tunnel. When an unexpected gas leakage accident happens in the actual situation, the prior information associated with the leakage source is commonly unclear or unknown. Therefore, the absence of an available tool for reasonable leakage and dispersion prediction in the above scenario precludes the timely and appropriate emergency response treatment. In this study, a three-dimensional source term estimation (3D-STE) model with the combination of the computational fluid dynamics (CFD) and ensemble Kalman filter (EnKF) algorithm is proposed to achieve spatiotemporal gas concentration prediction and gas emission source estimation. In the proposed approach, the observation data can be incorporated into the gas dispersion simulations continuously, thus the simulation results can be revised by the observation data and the source term estimation of gas leakage can be achieved by employing the EnKF algorithm. A twin experiment is employed to validate the effectiveness and practicability of the proposed model. The results show that the proposed model can revise the prior errors in the gas leakage rate significantly and obtain an accurate prediction of gas concentration distribution as well as gas leakage rate. A feasible framework is also proposed serving as a good paradigm for the 3D-STE model application. This study helps for consequence assessment and emergency response of gas leakage accidents in utility tunnels.","Computational fluid dynamics; Ensemble Kalman filter; Gas leakage; OpenFOAM; Utility tunnel","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","Safety and Security Science","","",""
"uuid:f6d09e83-b104-480d-81c9-bae95821d498","http://resolver.tudelft.nl/uuid:f6d09e83-b104-480d-81c9-bae95821d498","Joint energy consumption optimization method for wing-diesel engine-powered hybrid ships towards a more energy-efficient shipping","Wang, Kai (Dalian Maritime University); Xue, Yu (Dalian Maritime University); Xu, Hao (Dalian Maritime University); Huang, Lianzhong (Dalian Maritime University); Ma, Ranqi (Dalian Maritime University); Zhang, Peng (Dalian Maritime University); Jiang, X. (TU Delft Transport Engineering and Logistics); Yuan, Yupeng (University of Cambridge; MOST); Negenborn, R.R. (TU Delft Transport Engineering and Logistics); Sun, Peiting (Dalian Maritime University)","","2022","Wing-diesel engine-powered hybrid ships can effectively reduce fuel consumption and CO2 emissions by using wind energy as the auxiliary driving power. The energy optimization management of the hybrid system can further improve the ship's energy efficiency. To achieve this purpose, it is significant to establish an effective energy consumption model for the energy optimization management of the hybrid system. Therefore, an energy consumption model is established based on the energy conversion analysis of the hybrid power system in this paper. This model can effectively describe the energy consumption of the hybrid ship under different navigational environmental conditions. Then, a joint optimization method of the wing attack angle and of the sailing speed for the hybrid ship is proposed by adopting a swarm intelligence optimization algorithm, in order to reduce energy consumption and CO2 emissions of the hybrid ship under different navigational environmental conditions. Finally, the energy consumption optimization potentials by adopting the hybrid power system and the proposed joint optimization method are analyzed. The results show that the energy consumption and CO2 emissions along a typical route can be reduced by about 4.5%. This study provides an important basis for future practical operations of wing-diesel engine-powered hybrid ships.","Carbon neutrality; Energy consumption optimization; Hybrid ship; Low carbon shipping; Wind energy","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-07-29","","","Transport Engineering and Logistics","","",""
"uuid:1f7ee5aa-b2ab-4e76-982d-a1cb4588de7f","http://resolver.tudelft.nl/uuid:1f7ee5aa-b2ab-4e76-982d-a1cb4588de7f","Identification of metro-bikeshare transfer trip chains by matching docked bikeshare and metro smartcards","Ma, Xinwei (Hebei University of Technology); Zhang, Shuai (Hebei University of Technology); Jin, Yuchuan (KTH Royal Institute of Technology); Zhu, Minqing (Hebei University of Technology); Yuan, Y. (TU Delft Transport and Planning)","","2022","Metro-bikeshare integration, an important way of improving the efficiency of public transportation, has grown rapidly during the last decades in many countries. However, most previous analysis of metro-bikeshare transfer trips were based on limited sample size and the number of recognized metro-bikeshare trips were not sufficient. The primary objective of this study is to derive a method to recognize metro-bikeshare transfer trips. The two data sources are provided by Nanjing Metro Company and Nanjing Public Bicycle Company over the same period from 9–29 March 2016. The identifying method includes three steps: (1) Matching Card Pairs (2) Filtering Card Pairs and (3) Identifying Card Pairs. The case study indicates that the Support Vector Classification (SVC) performs best with a high prediction accuracy of 95.9% using seamless smartcards. The identifying method is then used to recognize the transfer trips from other types of cards, resulting in 17,022 valid metro-bikeshare transfer trips made by 2948 travelers. Finally, travel patterns extracted from the two groups of identified transfer trips are analyzed comparatively. The method proposed presents new opportunities for analyzing metro-bikeshare transfer trip characteristics.","Identifying method; Metro-bikeshare integration; Prediction model; Smartcard","en","journal article","","","","","","","","","","","Transport and Planning","","",""
"uuid:f372ca96-ccb6-4c0b-9721-3b49989df788","http://resolver.tudelft.nl/uuid:f372ca96-ccb6-4c0b-9721-3b49989df788","Optical singularity assisted method for accurate parameter detection of step-shaped nanostructure in coherent Fourier scatterometry","Dou, X. (TU Delft ImPhys/Optics; Shenzhen University); Min, Changjun (Shenzhen University); Zhang, Yuquan (Shenzhen University); Pereira, S.F. (TU Delft ImPhys/Optics); Yuan, Xiaocong (Shenzhen University)","","2022","Accurate determination of the physical parameters of nanostructures from optical far-field scattering is an important and challenging topic in the semiconductor industry. Here, we propose a novel metrology method to determine simultaneously the height and side-wall angle of a step-shaped silicon nanostructure. By employing an optical singular beam into a typical coherent Fourier scatterometry system, both parameters can be retrieved through analyzing the intensity profile of the far-field scattering pattern. The use of singular beam is shown to be sensitive to slight changes of the parameters of the step. By changing the relative direction between the singularity and structure, the height and side-wall angle can both be retrieved with high precision. This new method is robust, simple, and can provide valuable means for micro-and-nano- metrologies.","","en","journal article","","","","","","","","","","","ImPhys/Optics","","",""
"uuid:e6c67afb-52fa-4875-9a45-3bda5563e462","http://resolver.tudelft.nl/uuid:e6c67afb-52fa-4875-9a45-3bda5563e462","A review on recovery of extracellular biopolymers from flocculent and granular activated sludges: Cognition, key influencing factors, applications, and challenges","Chen, Xingyu (University of Tsukuba); Lee, Yu Jen (National Taiwan University); Yuan, Tian (University of Tsukuba); Lei, Zhongfang (University of Tsukuba); Adachi, Yasuhisa (University of Tsukuba); Zhang, Zhenya (University of Tsukuba); Lin, Y. (TU Delft BT/Environmental Biotechnology); van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology)","","2022","A reasonable recovery of excess sludge may shift the waste into wealth. Recently an increasing attention has been paid to the recycling of extracellular biopolymers from conventional and advanced biological wastewater treatment systems such as flocculent activated sludge (AS), bacterial aerobic granular sludge (AGS), and algal-bacterial AGS processes. This review provides the first overview of current research developments and future directions in the recovery and utilization of high value-added biopolymers from the three types of sludge. It details the discussion on the recent evolvement of cognition or updated knowledge on functional extracellular biopolymers, as well as a comprehensive summary of the operating conditions and wastewater parameters influencing the yield, quality, and functionality of alginate-like exopolymer (ALE). In addition, recent attempts for potential practical applications of extracellular biopolymers are discussed, suggesting research priorities for overcoming identification challenges and future prospects.","Algal-bacterial aerobic granular sludge; Alginate-like exopolymer; Bacterial aerobic granular sludge; Extracellular biopolymer; Flocculent activated sludge","en","review","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-07-01","","","BT/Environmental Biotechnology","","",""
"uuid:78cd8005-67dc-4545-8d05-8198efda9700","http://resolver.tudelft.nl/uuid:78cd8005-67dc-4545-8d05-8198efda9700","Controllable Shrinking Fabrication of Solid-State Nanopores","Lei, Xin (Beihang University; Tsinghua University); Zhang, Jiayan (Beihang University); Hong, H. (TU Delft Electronic Components, Technology and Materials; Tsinghua University); Yuan, Zhishan (Guangdong University of Technology); Liu, Zewen (Tsinghua University)","","2022","Nanopores have attracted widespread attention in DNA sequencing and protein or biomarker detection, owning to the single-molecule-scale detection accuracy. Despite the most use of naturally biological nanopores before, solid-state nanopores are widely developed with strong robustness, controllable sizes and geometries, a wide range of materials available, as well as flexible manufacturing. Therefore, various techniques typically based on focused ion beam or electron beam have been explored to drill nanopores directly on free-standing nanofilms. To further reduce and sculpt the pore size and shape for nano or sub-nano space-time sensing precision, various controllable shrinking technologies have been employed. Correspondingly, high-energy-beam-induced contrac-tion with direct visual feedback represents the most widely used. The ability to change the pore diameter was attributed to surface tension induced original material migration into the nanopore center or new material deposition on the nanopore surface. This paper reviews typical solid-state nanopore shrinkage technologies, based on the careful summary of their principles and characteristics in particularly size and morphology changes. Furthermore, the advantages and disadvantages of different methods have also been compared completely. Finally, this review concludes with an optimistic outlook on the future of solid-state nanopores.","high energy beam; shrinking fabrication; size and shape control; solid-state nanopores","en","review","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:e939b815-6f5b-4f18-ba29-f8f5d7d7592d","http://resolver.tudelft.nl/uuid:e939b815-6f5b-4f18-ba29-f8f5d7d7592d","A Biocatalytic Platform for the Synthesis of Enantiopure Propargylic Alcohols and Amines","Sang, Xianke (Chinese Academy of Sciences); Tong, Feifei (Chinese Academy of Sciences); Zeng, Zhigang (Hubei University of Science and Technology, Hubei); Wu, Minghu (Hubei University of Science and Technology, Hubei); Yuan, Bo (Chinese Academy of Sciences); Sun, Zhoutong (Chinese Academy of Sciences); Sheng, Xiang (Chinese Academy of Sciences); Hollmann, F. (TU Delft BT/Biocatalysis); Zhang, W. (TU Delft BT/Biocatalysis; Chinese Academy of Sciences)","","2022","Propargylic alcohols and amines are versatile building blocks in organic synthesis. We demonstrate a straightforward enzymatic cascade to synthesize enantiomerically pure propargylic alcohols and amines from readily available racemic starting materials. In the first step, the peroxygenase from Agrocybe aegerita converted the racemic propargylic alcohols into the corresponding ketones, which then were converted into the enantiomerically pure alcohols using the (R)-selective alcohol dehydrogenase from Lactobacillus kefir or the (S)-selective alcohol dehydrogenase from Thermoanaerobacter brokii. Moreover, an enzymatic Mitsunobu-type conversion of the racemic alcohols into enantiomerically enriched propargylic amines using (R)-selective amine transaminase from Aspergillus terreus or (S)-selective amine transaminase from Chromobacterium violaceum was established. The one-pot two-step cascade reaction yielded a broad range of enantioenriched alcohol and amine products in 70-99% yield.","","en","journal article","","","","","","","","","","","BT/Biocatalysis","","",""
"uuid:704bcad1-146f-4645-85ca-acb73fc01f48","http://resolver.tudelft.nl/uuid:704bcad1-146f-4645-85ca-acb73fc01f48","Fresh and hardened properties of self-compacting concrete containing recycled fine clay brick aggregates","Zhang, Hongzhi (Shandong University); Yuan, Huaqiang (Shandong University); Ge, Zhi (Shandong University); Wu, Jiajie (Shandong University); Fang, Cheng (Shandong University); Schlangen, E. (TU Delft Materials and Environment); Šavija, B. (TU Delft Materials and Environment)","","2021","Clay brick is one of the major components of demolition waste, which is generally landfilled. Effective and new uses of recycled clay brick may provide sustainability benefits in terms of landfill reduction. Therefore, this research aims at applying Recycled fine clay brick aggregates (RFCBA) with sizes from 0.075 mm–4.75 mm to prepare Self-compacting concrete (SCC). The effects of RFCBA on fresh and hardened properties of SCC were investigated. Saturated surface dry RFCBA was used to replace Natural fine aggregate (NFA) with the percentage of 25%, 50%, 75% and 100%, respectively, in making the SCC mixes. Although experimental results showed that the flowability, passing ability, and segregation resistance of SCC containing RFCBA (RFCBA-SCC) decreased with the increasing RFCBA content, these properties still satisfy the criteria of SCC. The compressive strength, splitting strength, flexural strength, and elastic modulus of the RFCBA-SCC mixes decreased with an increase of RFCBA content. Due to their porous nature, recycled fine clay brick aggregates may also be a source of additional water for internal curing. The internal curing effect was confirmed by the mercury intrusion porosimetry, X-ray diffraction, and thermogravimetric analysis measurements. Moreover, a significant autogenous shrinkage reduction of SCC is achieved by using the RFCBA due to the release of additional water pre-stored in the RFCBA. Therefore, it can be concluded that the addition of RFCBA to SCC mixtures can provide additional practical benefits in the hardened state.","Recycled fine clay brick aggregate; Selfcompacting concrete; Rheology properties; Mechanical properties; Microstructures; Self-compacting concrete","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public","","2022-01-13","","","Materials and Environment","","",""
"uuid:f6ea009a-fa7d-4e74-8f5d-d6be3e2d43e6","http://resolver.tudelft.nl/uuid:f6ea009a-fa7d-4e74-8f5d-d6be3e2d43e6","Plant traits determining biogeomorphic landscape dynamics: A study on clonal expansion strategies driving cliff formation at marsh edges","Cao, Haobing (East China Normal University; Universiteit Utrecht); Zhu, Zhenchang (Guangdong University of Technology); Herman, P.M.J. (TU Delft Environmental Fluid Mechanics; TU Delft Hydraulic Engineering; Deltares); Temmerman, Stijn (Universiteit Antwerpen); de Smit, Jaco (Universiteit Utrecht); Zhang, Liquan (East China Normal University); Yuan, Lin (East China Normal University); Bouma, Tjeerd J. (Universiteit Utrecht)","","2021","Despite the well-recognized importance of plant traits for biogeomorphic development of landscapes, our understanding remains limited of how species-specific plant traits respond to and serve as drivers for the sedimentary dynamics within a biogeomorphic landscape. By manipulating a series of laboratory experiments, using mesocosms and a flume, we examined how species-specific differences in expansion strategy, i.e., clonal step-length of laterally expanding tillers, both respond to sediment type and drive cliff formation and persistence. We compared three marsh species, with contrasting clonal expansion traits, that are dominant in many estuaries worldwide: Spartina anglica, Scirpus maritimus, and Phragmites australis. Our results revealed that S. anglica tussocks tend to have high shoot density due to a short clonal expansion step-length, whereas S. maritimus tussocks were much more diffuse and tend to have a longer clonal expansion step-length. P. australis showed intermediate traits. Clonal expansion step-length did show within-species variation in response to sediment texture, but species-specific differences remained the most important. Species with smaller clonal step-lengths, such as S. anglica in this study, are more likely to induce cliffs at the marsh edge by driving formation of larger cliff heights and also having lower capacity to grow out from cliffs. Our findings thus illustrate how dynamic landscape features like cliffs at marsh edges depend on the clonal expansion traits of the dominant species. This enhances current understanding of the formation and development of marsh edges, and is instructive for understanding the role of species-specific traits in driving distinct biogeomorphic landscape dynamics.","","en","journal article","","","","","","","","","","Hydraulic Engineering","Environmental Fluid Mechanics","","",""
"uuid:1f7d4796-c759-4b39-8894-c823a313bcf1","http://resolver.tudelft.nl/uuid:1f7d4796-c759-4b39-8894-c823a313bcf1","Transformation towards a carbon-neutral residential community with hydrogen economy and advanced energy management strategies","He, Yingdong (University of California; Hunan University); Zhou, Yuekuan (The Hong Kong University of Science and Technology); Yuan, Jing (University of California); Liu, Zhengxuan (TU Delft Housing Quality and Process Innovation; Hunan University); Wang, Zhe (Lawrence Berkeley National Laboratory); Zhang, Guoqiang (Hunan University)","","2021","Cleaner power production, distributed renewable generation, building-vehicle integration, hydrogen storage and associated infrastructures are promising for transformation towards a carbon–neutral community, whereas the academia provides limited information through integrated solutions, like intermittent renewable integration, hydrogen sharing network, smart operation on electrolyzer and fuel cell, seasonal hydrogen storage and advanced heat recovery. This study proposes a hybrid electricity-hydrogen sharing system in California, United States, with synergistic electric, thermal and hydrogen interactions, including low-rise houses, rooftop photovoltaic panels, hydrogen vehicles, a hydrogen station, micro and utility power grid and hydrogen pipelines. Advanced energy management strategies were proposed to enhance energy flexibility and grid stability. Besides, simulation-based optimizations on smart power flows of vehicle-to-grid interaction and electrolyzer are conducted for further seasonal grid stability and annual cost saving. The obtained results indicate that, the green renewable-to-hydrogen can effectively reduce reliance on pipelines delivered hydrogen, and the hydrogen station is effective to address security concerns of high-pressure hydrogen and improve participators’ acceptance. Microgrid peer-to-peer sharing can improve hydrogen system efficiency under idling modes. Furthermore, the integrated system can reduce the annual net hydrogen consumption in transportation from 127.0 to 1.2 kg/vehicle. The smart operation (minimum input power of electrolyzer and fuel cell at 65 and 80 kW) can reduce the maximum mean hourly grid power to 78.2 kW by 24.2% and the annual energy cost to 1228.5 $/household by 38.9%. The proposed district hydrogen-based community framework can provide cutting-edge techno-economic guidelines for carbon-neutral transition with district peer-to-peer energy sharing, zero-energy buildings, hydrogen-based transportations together with smart strategies for high energy flexibility.","Distributed hydrogen infrastructure; Distributed renewable energy sharing; Flexible energy management strategy; Hydrogen energy storage and economy; Solar energy","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-04-09","","","Housing Quality and Process Innovation","","",""
"uuid:cbf16540-8b2e-4d08-b8cb-3082a1427774","http://resolver.tudelft.nl/uuid:cbf16540-8b2e-4d08-b8cb-3082a1427774","Salt marsh establishment in poorly consolidated muddy systems: effects of surface drainage, elevation, and plant age","Cao, Haobing (East China Normal University; Universiteit Utrecht); Zhu, Zhenchang (Guangdong University of Technology; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)); van Belzen, Jim (Universiteit Utrecht); Gourgue, Olivier (Universiteit Antwerpen); van de Koppel, J. (Universiteit Utrecht); Temmerman, O. Stijn (Universiteit Antwerpen); Herman, P.M.J. (TU Delft Hydraulic Engineering); Zhang, Liquan (East China Normal University); Yuan, Lin (East China Normal University); Bouma, Tjeerd J. (Universiteit Utrecht; Rijksuniversiteit Groningen; NIOZ Royal Netherlands Institute for Sea Research)","","2021","Conservation and restoration of salt marsh ecosystems are becoming increasingly important because of the many ecosystem services they provide. However, the processes controlling salt marsh establishment and persistence, especially on bare tidal flats in muddy areas, remain unclear. As muddy sediments typically experience a restriction of soil drainage, we expect that a surface drainage relief due to a heterogeneity topography, as might occur on the edge of tidal channels, can facilitate the establishment of salt marsh vegetation on muddy tidal flats. By means of a manipulative field experiment, using “Mega-Marsh Organ” mesocosms, we investigated the impact of surface drainage and elevation relative to mean sea level on (1) the survival of Spartina anglica seedlings from three different age classes: 1-yr, 3-month, and 1-week; and (2) the growth performance of mature S. anglica marsh tussocks. S. anglica seedling survival, especially in the establishment phase, was positively affected by better surface drainage, increases of seedling age, and higher elevation relative to mean sea level. That is, the survival rate of S. anglica seedlings at the end of 6th week increased from 0% (at surface water undrained, 1-week, 0 cm elevation) to 94.44% (at surface water drained, 1-yr, 90 cm elevation). In contrast, surface drainage did not affect the performance of large S. anglica marsh tussocks, as only increased elevation relative to mean sea level was shown to affect S. anglica tussock growth in terms of plant height, shoot numbers, and dry biomass. Based on our findings, we proposed a conceptual model to understand how surface drainage-driven feedbacks in a heterogeneous topography may be reinforced to induce salt marsh establishment in muddy systems. Further testing of present hypothesized model would be beneficial for insights into salt marsh establishment on tidal mudflats.","establishment; muddy sediment; plant age; relative elevation to mean sea level; salt marsh; surface drainage","en","journal article","","","","","","","","","","Hydraulic Engineering","","","",""
"uuid:9d9ff795-5300-4f67-9e38-856be956f065","http://resolver.tudelft.nl/uuid:9d9ff795-5300-4f67-9e38-856be956f065","Nonlinearity-modulated single molecule trapping and Raman scattering analysis","Zhang, Shuoshuo (Shenzhen University); Zhang, Yuquan (Shenzhen University); Fu, Yanan (Shenzhen University); Zhu, Z. (TU Delft ImPhys/Optics; Shenzhen University); Man, Zhongsheng (Shandong University of Technology; Shandong Normal University); Bu, Jing (Shenzhen University); Fang, Hui (Shenzhen University); Min, Changjun (Shenzhen University); Yuan, Xiaocong (Shenzhen University)","","2021","Single molecule detection and analysis play important roles in many current biomedical researches. The deep-nanoscale hotspots, being excited and confined in a plasmonic nanocavity, make it possible to simultaneously enhance the nonlinear light-matter interactions and molecular Raman scattering for label-free detections. Here, we theoretically show that a nanocavity formed in a tip-enhanced Raman scattering (TERS) system can also achieve valid optical trapping as well as TERS signal detection for a single molecule. In addition, the nonlinear responses of metallic tip and substrate film can change their intrinsic physical properties, leading to the modulation of the optical trapping force and the TERS signal. The results demonstrate a new degree of freedom brought by the nonlinearity for effectively modulating the optical trapping and Raman detection in single molecule level. This proposed platform also shows a great potential in various fields of research that need high-precision surface imaging.","","en","journal article","","","","","","","","","","","ImPhys/Optics","","",""
"uuid:2ab3045b-03f3-4d8a-9403-e5b708636ac7","http://resolver.tudelft.nl/uuid:2ab3045b-03f3-4d8a-9403-e5b708636ac7","Solder joint reliability risk estimation by AI-assisted simulation framework with genetic algorithm to optimize the initial parameters for AI models","Yuan, Cadmus (Feng Chia University); Fan, Xuejun (Lamar University); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials)","","2021","Solder joint fatigue is one of the critical failure modes in ball-grid array packaging. Because the reliability test is time-consuming and geometrical/material nonlinearities are required for the physics-driven model, the AI-assisted simulation framework is developed to establish the risk estimation capability against the design and process parameters. Due to the time-dependent and nonlinear characteristics of the solder joint fatigue failure, this research follows the AI-assisted simulation framework and builds the non-sequential artificial neural network (ANN) and sequential recurrent neural network (RNN) architectures. Both are investigated to understand their capability of abstracting the time-dependent solder joint fatigue knowledge from the dataset. Moreover, this research applies the genetic algorithm (GA) optimization to decrease the influence of the initial guessings, including the weightings and bias of the neural network architectures. In this research, two GA optimizers are developed, including the “back-to-original” and “progressing” ones. Moreover, we apply the principal component analysis (PCA) to the GA optimization results to obtain the PCA gene. The prediction error of all neural network models is within 0.15% under GA optimized PCA gene. There is no clear statistical evidence that RNN is better than ANN in the wafer level chip-scaled packaging (WLCSP) solder joint reliability risk estimation when the GA optimizer is applied to minimize the impact of the initial AI model. Hence, a stable optimization with a broad design domain can be realized by an ANN model with a faster training speed than RNN, even though solder fatigue is a time-dependent mechanical behavior.","Artificial neural net-work; Generic algorithm; Principle component analysis; Recurrent neural network; Solder joint fatigue risk estimation; Time/temperature-dependent nonlinearity; Wafer level chip-scaled packaging","en","journal article","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:a8ad1db7-0499-43d6-85c9-01eb9a47a7c3","http://resolver.tudelft.nl/uuid:a8ad1db7-0499-43d6-85c9-01eb9a47a7c3","Lyapunov-Equation-Based Stability Analysis for Switched Linear Systems and Its Application to Switched Adaptive Control","Yuan, S. (TU Delft Team Bart De Schutter; Harbin Institute of Technology); Lv, Maolong (TU Delft Team Bart De Schutter); Baldi, S. (TU Delft Team Bart De Schutter; Southeast University); Zhang, Lixian (Harbin Institute of Technology)","","2021","This article investigates the stability of continuous-time switched linear systems with dwell-time constraints. A fresh insight into this established problem is provided via novel stability conditions that require the solution to a family of differential Lyapunov equations and algebraic Lyapunov equations. The proposed analysis, which leads to a peculiar Lyapunov function that is decreasing in between and at switching instants, enjoys the following properties: it achieves the same dwell time as the well-known result in the research 'stability and stabilization of continuous time switched linear systems' by Geromel and Colaneri; it removes the increasing computational complexity of the linear interpolation method; it leads to a straightforward counterpart for discrete-time switched linear systems.We show the application of this methodology to the problem of adaptive control of switched linear systems with parametric uncertainties.","Dwell-time switching; stability analysis; switched adaptive control; switched linear systems","en","journal article","","","","","","Accepted Author Manuscript","","","","","Team Bart De Schutter","","",""
"uuid:f34cfcbb-10ff-421f-8876-974c718b1e79","http://resolver.tudelft.nl/uuid:f34cfcbb-10ff-421f-8876-974c718b1e79","Plasmonic tweezers: for nanoscale optical trapping and beyond","Zhang, Yuquan (Shenzhen University); Min, Changjun (Shenzhen University); Dou, X. (TU Delft ImPhys/Optics; Shenzhen University); Wang, Xianyou (Shenzhen University); Urbach, Paul (TU Delft ImPhys/Optics); Somekh, Michael G. (Shenzhen University); Yuan, Xiaocong (Shenzhen University)","","2021","Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects. More recently, the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods. The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength; with this confinement, the plasmonic field facilitates trapping of various nanostructures and materials with higher precision. The successful manipulation of small particles has fostered numerous and expanding applications. In this paper, we review the principles of and developments in plasmonic tweezers techniques, including both nanostructure-assisted platforms and structureless systems. Construction methods and evaluation criteria of the techniques are presented, aiming to provide a guide for the design and optimization of the systems. The most common novel applications of plasmonic tweezers, namely, sorting and transport, sensing and imaging, and especially those in a biological context, are critically discussed. Finally, we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.","","en","review","","","","","","","","","","","ImPhys/Optics","","",""
"uuid:92364ae0-3458-4bb3-b0e8-47bd8035c025","http://resolver.tudelft.nl/uuid:92364ae0-3458-4bb3-b0e8-47bd8035c025","CFD and EnKF coupling estimation of LNG leakage and dispersion","Wu, Jiansong (China University of Mining and Technology (Beijing)); Cai, Jitao (China University of Mining and Technology (Beijing)); Yuan, S. (TU Delft Safety and Security Science; China University of Mining and Technology (Beijing)); Zhang, Xiaole (ETH Zürich); Reniers, G.L.L.M.E. (TU Delft Safety and Security Science)","","2021","As a kind of clean fuel, increasing quantities of natural gas have been transported as liquefied natural gas (LNG) worldwide. The safety of LNG storage has gained the concerns from the public due to the potential severe consequences that may arise from LNG leakage. In this paper, a three-dimensional model with the combination of computational fluid dynamics (CFD) and the ensemble Kalman filter (EnKF) is proposed to predict LNG vapor dispersion and estimate the strength of the LNG leakage source. The LNG vapor dispersion CFD model is validated by the experimental data with good feasibility, and is further demonstrated with the reasonable modeling of the characteristics of the LNG vapor dispersion in a typical receiving terminal. The effectiveness of the proposed CFD and EnKF coupling model is evaluated and validated by a twin experiment. The results of the twin experiment indicate that the proposed CFD and EnKF coupling model allows the integration of observation data into the CFD simulations to enhance the prediction accuracy of the LNG vapor spatial-temporal distribution and thereby realizing a reasonable estimation of the LNG leakage velocity under complex environments. This study can provide technical supports for safety control, loss prevention and emergency response in case of LNG leakage accidents.","Computational fluid dynamics; Ensemble Kalman filter; LNG leakage; LNG receiving terminal; LNG vapor dispersion","en","journal article","","","","","","","","2024-03-30","","","Safety and Security Science","","",""
"uuid:e545d5f9-be21-4cb6-83be-b8306bd04e10","http://resolver.tudelft.nl/uuid:e545d5f9-be21-4cb6-83be-b8306bd04e10","Determination of steep sidewall angle using polarization-sensitive asymmetric scattering","Dou, X. (TU Delft ImPhys/Optics; Shenzhen University); Pereira, S.F. (TU Delft ImPhys/Optics); Min, Changjun (Shenzhen University); Zhang, Yuquan (Shenzhen University); Meng, P. (TU Delft ImPhys/Optics); Urbach, Paul (TU Delft ImPhys/Optics); Yuan, Xiaocong (Shenzhen University)","","2021","The sidewall angle (SWA) of a nanostructure exerts influence on the performance of the nanostructure and plays an important role in processing nano-structural chips. It is still a great challenge to determine steep SWAs from far field measurements especially when the SWAs are close to 90°. Here, we propose a far-field detection system to determine steep SWA of a cliff-shape step structure on a silicon substrate by combining a split detector with a scanning method. The far-field radiation field is asymmetric due to the scattering of the step structure, and further numerical analysis demonstrates the reliability of this far-field measurement method. In the simulations, two key variables, i.e. the polarization state and the focus position of the incident laser beam, are considered to explore their impacts. By scanning over the structure laterally and longitudinally with both TE and TM polarizations, polarization effects on the far-field occur. These effects show higher sensitivity to steep SWA variation for TM polarization as compared to TE. Furthermore, with a comprehensive longitudinal scanning analysis for the TM polarization case, a feasible focus interval can be optimized to retrieve the steep SWA. As the proposed method is fast, highly sensitive and easy to implement, it provides a powerful approach to investigate the scattering behavior of nanostructures.","optical metrology; Optical scattering; sidewall angle retrieval","en","journal article","","","","","","","","","","","ImPhys/Optics","","",""
"uuid:b4baafb7-9288-4efb-a62f-e5c5d821bf05","http://resolver.tudelft.nl/uuid:b4baafb7-9288-4efb-a62f-e5c5d821bf05","撞击位置与风扇转速对鸟撞过程的影响","Zhang, Junhong (Tianjin University); Liu, Zhiyuan (Tianjin University); Dai, Huwei (Tianjin University); Hedayati, R. (TU Delft Novel Aerospace Materials); Yuan, Y. (TU Delft Sanitary Engineering; State Key Laboratory of Engine; Tianjin University); Zhang, Guichang (Civil Aviation University of China)","","2020","Bird impact on fan blades poses a serious threat to the operational safety of aircraft engines.In this study, a real bird model of mallard duck was developed using the smooth particle hydrodynamics method based on a CT scan of a mallard duck.The accuracy of the real bird model was verified by comparing the simulation results of the impact on a plate of real bird model and simplified traditional bird model with the results of Wilbeck's tests.The transient impact responses of bird body and fan blade as the bird was striking a static and a rotating fan blade were comparatively analyzed.To study the effect of fan rotational speed on the bird-impact process, 836r/min, 1984r/min, 3344r/min, and 3772r/min were selected as fan rotational speed.To study the effects of impact location on the bird-impact process, 1/6, 2/6, 3/6, 4/6 and 5/6 of the blade height were selected as impact locations.The results show that blade rotation has a direct impact on the number of bird block cuts, the mass of a single bird block, and the number of impacted blades.Without considering the blade rotation conditions, the contact force, blade root stress, and blade leading edge stress are significantly lower than that when the blade rotation conditions are considered, which makes the prediction of blade stress and damage conservative and inadequate for use in the design of blade strength.Therefore, the blade rotation motion should be considered in the study of bird impact.The interaction mode between the bird and blade at 836r/min speed obviously differs from that at other rotational speeds.The kinetic energy of the bird decreases at a rotational speed of 836r/min, and increases at other rotational speeds, and the increment of the kinetic energy of the bird increases with increases in rotational speed.The leading-edge peak stress at 836r/min is greater than that at 1984r/min;at other rotational speeds, the peak stress of the leading edge increases with increases in the rotational speed.The contact force and blade root stress increase with increases in the rotational speed.With increases in the impact height, the contact force, kinetic-energy increment of the bird body, peak stress of the blade root, kinetic energy of the bird body, and the stress on the leading edge of blade all increase first and then decrease under the combined action of the relative velocity of the impact point and twist angle of the blade.The peak stress of the leading edge and the increment of the kinetic energy of the bird are greatest when impact occurs at 3/6 blade height, and the peak stress of the blade root and the contact force are greatest when impact occurs at 4/6 blade height.","Bird impact; Fan rotation speed; Impact position; Impact response; Mallard","zh","journal article","","","","","","","","","","","Novel Aerospace Materials","","",""
"uuid:425f3a2d-32f9-4e01-9cfa-f221e4ea3459","http://resolver.tudelft.nl/uuid:425f3a2d-32f9-4e01-9cfa-f221e4ea3459","Dynamic prediction of optical and chromatic performances for a light-emitting diode array based on a thermal-electrical-spectral model","Fan, J. (TU Delft Electronic Components, Technology and Materials; Fudan University; Hohai University; Changzhou Institute of Technology Research for Solid State Lighting); Chen, Wei (Hohai University; Changzhou Institute of Technology Research for Solid State Lighting); Yuan, Weiyi (Hohai University); Fan, X. (TU Delft Electronic Components, Technology and Materials; Lamar University); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials)","","2020","Light-emitting diode (LED) arrays have attracted increased attention in the area of high power intelligent automotive headlamps because of their superiority in disposing of the power limit of an individual LED package and controllably luminous intensity and illumination pattern. The optical and chromatic performances of an LED array do not equal to the sum of individual LED packages’ performances, as the thermal interactions between individual LED packages can’t be ignored in the actual application. This paper presents a thermal-electrical-spectral (TES) model to dynamically predict the optical and chromatic performances of the LED array. The thermal-electrical (TE) model considering the thermal coupling effect in the LED array is firstly proposed to predict the case temperature of each individual LED package, and the Spectral power distributions (SPDs) of individual LED package is then decomposed by the extended Asym2sig model to extract the spectral characteristic parameters. Finally, the experimental measurements of the designed LED arrays operated under usage conditions are used to verify the TES model. Some validation case studies show that the prediction accuracy of the proposed TES model, which is expressed as a quadratic polynomial function of current and case temperature, can be achieved higher than 95%. Therefore, it can be concluded that this TES model offers a convenient method with high accuracy to dynamically predict the optical and chromatic performances of LED arrays at real usages.","","en","journal article","","","","","","","","","","","Electronic Components, Technology and Materials","","",""
"uuid:090bb7ff-12f1-4fc6-b4ed-9208147f6e7b","http://resolver.tudelft.nl/uuid:090bb7ff-12f1-4fc6-b4ed-9208147f6e7b","Water-Soluble Anthraquinone Photocatalysts Enable Methanol-Driven Enzymatic Halogenation and Hydroxylation Reactions","Yuan, Bo (Xi’an Jiaotong University); Mahor, Durga (Xi’an Jiaotong University); Fei, Qiang (Xi’an Jiaotong University); Wever, Ron (Universiteit van Amsterdam); Alcalde, Miguel (Institute of Catalysis, CSIC, Madrid); Zhang, Wuyuan (Xi’an Jiaotong University); Hollmann, F. (TU Delft BT/Biocatalysis)","","2020","Peroxyzymes simply use H2O2 as a cosubstrate to oxidize a broad range of inert C-H bonds. The lability of many peroxyzymes against H2O2 can be addressed by a controlled supply of H2O2, ideally in situ. Here, we report a simple, robust, and water-soluble anthraquinone sulfonate (SAS) as a promising organophotocatalyst to drive both haloperoxidase-catalyzed halogenation and peroxygenase-catalyzed oxyfunctionalization reactions. Simple alcohols, methanol in particular, can be used both as a cosolvent and an electron donor for H2O2 generation. Very promising turnover numbers for the biocatalysts of up to 318 »000 have been achieved.","HOgeneration; halogenation; hydroxylation; peroxyzymes; photobiocatalysis","en","journal article","","","","","","","","","","","BT/Biocatalysis","","",""
"uuid:3bf1505f-d399-43b7-8ca5-d5f8d6616bff","http://resolver.tudelft.nl/uuid:3bf1505f-d399-43b7-8ca5-d5f8d6616bff","Adaptive stabilization of impulsive switched linear time-delay systems: A piecewise dynamic gain approach","Yuan, S. (Harbin Institute of Technology); Zhang, Lixian (Harbin Institute of Technology); Baldi, S. (TU Delft Team Bart De Schutter; Southeast University)","","2019","In the presence of discontinuous time-varying delays, neither Krasovskii nor Razumikhin techniques can be successfully applied to adaptive stabilization of uncertain switched time-delay systems. This paper develops a new adaptive control scheme for switched time-delay systems that can handle impulsive behavior in both states and time-varying delays. At the core of the proposed scheme is a Lyapunov function with a dynamically time-varying coefficient, which allows the Lyapunov function to be non-increasing at the switching instants. The control scheme, guaranteeing global uniformly ultimate boundedness of the closed-loop system, substantially enlarges the class of uncertain switched systems for which the adaptive stabilization problem can be solved. A two-tank system is used to illustrate the effectiveness of the method.","Adaptive control; Impulsive switched linear systems; Mode-dependent dwell time; Time-varying delays","en","journal article","","","","","","Accepted Author Manuscript","","2021-02-23","","","Team Bart De Schutter","","",""
"uuid:42cf101f-a336-4257-830b-b5b4fd5ad689","http://resolver.tudelft.nl/uuid:42cf101f-a336-4257-830b-b5b4fd5ad689","Data driven discovery of cyber physical systems","Yuan, Ye (Huazhong University of Science and Technology); Tang, Xiuchuan (Huazhong University of Science and Technology); Zhou, Wei (Huazhong University of Science and Technology); Pan, W. (TU Delft Robot Dynamics); Li, Xiuting (Huazhong University of Science and Technology); Zhang, Hai Tao (Huazhong University of Science and Technology); Ding, Han (Huazhong University of Science and Technology); Goncalves, Jorge (Huazhong University of Science and Technology; Cavendish Laboratory; University of Luxembourg)","","2019","Cyber-physical systems embed software into the physical world. They appear in a wide range of applications such as smart grids, robotics, and intelligent manufacturing. Cyber-physical systems have proved resistant to modeling due to their intrinsic complexity arising from the combination of physical and cyber components and the interaction between them. This study proposes a general framework for discovering cyber-physical systems directly from data. The framework involves the identification of physical systems as well as the inference of transition logics. It has been applied successfully to a number of real-world examples. The novel framework seeks to understand the underlying mechanism of cyber-physical systems as well as make predictions concerning their state trajectories based on the discovered models. Such information has been proven essential for the assessment of the performance of cyber-physical systems; it can potentially help debug in the implementation procedure and guide the redesign to achieve the required performance.","","en","journal article","","","","","","","","","","","Robot Dynamics","","",""
"uuid:98dc531c-1d1a-4238-85e7-12bf07c9fe65","http://resolver.tudelft.nl/uuid:98dc531c-1d1a-4238-85e7-12bf07c9fe65","Uptake of heavy metal ions in layered double hydroxides and applications in cementitious materials: Experimental evidence and first-principle study","Li, Bo (Wuhan University of Technology); Zhang, Shizhe (TU Delft Materials and Environment); Li, Qiu (Wuhan University of Technology); Li, Neng (Wuhan University of Technology); Yuan, Bo (Wuhan University of Technology); Chen, Wei (Wuhan University of Technology); Brouwers, H.J.H. (Wuhan University of Technology; Eindhoven University of Technology); Yu, Qingliang (Eindhoven University of Technology)","","2019","The uptake mechanism of heavy metal ions in layered double hydroxides (LDHs) is investigated in this paper via solid-solution exchange experiments and first principle study. The uptake capacities of C-LDHs for heavy metal ions from solutions are experimentally investigated and the structures of LDHs doped with various heavy metal ions are revealed. The doped structures of LDHs are further re-established with first principle calculations. The results show that Cu2+ or Cr3+ ions are immobilized in the form of isomorphic substitution for Mg2+ and Al3+ in the plate of the layered structure, respectively, during reconstruction of calcined LDHs, forming a non-stoichiometric structure. The structure of the Cu2+ doped LDHs is identified as [Mg2+ (1−x)(1−z)Cu2+ (1−x)zAl3+ x(OH)2] An− x/n·yH2O, where z is the molar ratio of Cu2+ to Mg2+. The structure of Cr3+ doped LDHs is identified as [Mg2+ 1−x Cr3+ xzAl3+ x(1−z)(OH)2] An− (x+z)/n·yH2O, where z is the molar ratio of Cr3+ to Al3+. The Cu2+ or Cr3+ ions in the hardened cement paste modified with calcined Mg-Al LDHs as immobilizing admixture can be efficiently removed from the pore solution and chemically stabilized in the structure of LDHs.","First principle calculation; Heavy metal ions; Layered double hydroxides; Solid state NMR","en","journal article","","","","","","Accepted author manuscript","","2021-06-21","","","Materials and Environment","","",""
"uuid:2c4c2cff-ca09-432c-998d-2bacbca55ad9","http://resolver.tudelft.nl/uuid:2c4c2cff-ca09-432c-998d-2bacbca55ad9","A modified carrier-to-code leveling method for retrieving ionospheric observables and detecting short-term temporal variability of receiver differential code biases","Zhang, Baocheng (Chinese Academy of Sciences); Teunissen, P.J.G. (TU Delft Mathematical Geodesy and Positioning; Curtin University); Yuan, Yunbin (Chinese Academy of Sciences); Zhang, Xiao (Chinese Academy of Sciences); Li, Min (Chinese Academy of Sciences)","","2018","Sensing the ionosphere with the global positioning system involves two sequential tasks, namely the ionospheric observable retrieval and the ionospheric parameter estimation. A prominent source of error has long been identified as short-term variability in receiver differential code bias (rDCB). We modify the carrier-to-code leveling (CCL), a method commonly used to accomplish the first task, through assuming rDCB to be unlinked in time. Aside from the ionospheric observables, which are affected by, among others, the rDCB at one reference epoch, the Modified CCL (MCCL) can also provide the rDCB offsets with respect to the reference epoch as by-products. Two consequences arise. First, MCCL is capable of excluding the effects of time-varying rDCB from the ionospheric observables, which, in turn, improves the quality of ionospheric parameters of interest. Second, MCCL has significant potential as a means to detect between-epoch fluctuations experienced by rDCB of a single receiver.","Global positioning system (GPS); Ionosphere; Modified carrier-to-code leveling (MCCL); Receiver differential code bias (rDCB); Vertical total electron content (vTEC)","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2018-09-21","","","Mathematical Geodesy and Positioning","","",""
"uuid:c7f8dcad-6f58-43dc-bcc1-7d2817385dac","http://resolver.tudelft.nl/uuid:c7f8dcad-6f58-43dc-bcc1-7d2817385dac","Joint estimation of vertical total electron content (VTEC) and satellite differential code biases (SDCBs) using low-cost receivers","Zhang, Baocheng (Chinese Academy of Sciences); Teunissen, P.J.G. (TU Delft Mathematical Geodesy and Positioning; Curtin University); Yuan, Yunbin (Chinese Academy of Sciences); Zhang, Hongxing (Chinese Academy of Sciences); Li, Min (Chinese Academy of Sciences)","","2018","Vertical total electron content (VTEC) parameters estimated using global navigation satellite system (GNSS) data are of great interest for ionosphere sensing. Satellite differential code biases (SDCBs) account for one source of error which, if left uncorrected, can deteriorate performance of positioning, timing and other applications. The customary approach to estimate VTEC along with SDCBs from dual-frequency GNSS data, hereinafter referred to as DF approach, consists of two sequential steps. The first step seeks to retrieve ionospheric observables through the carrier-to-code leveling technique. This observable, related to the slant total electron content (STEC) along the satellite–receiver line-of-sight, is biased also by the SDCBs and the receiver differential code biases (RDCBs). By means of thin-layer ionospheric model, in the second step one is able to isolate the VTEC, the SDCBs and the RDCBs from the ionospheric observables. In this work, we present a single-frequency (SF) approach, enabling the joint estimation of VTEC and SDCBs using low-cost receivers; this approach is also based on two steps and it differs from the DF approach only in the first step, where we turn to the precise point positioning technique to retrieve from the single-frequency GNSS data the ionospheric observables, interpreted as the combination of the STEC, the SDCBs and the biased receiver clocks at the pivot epoch. Our numerical analyses clarify how SF approach performs when being applied to GPS L1 data collected by a single receiver under both calm and disturbed ionospheric conditions. The daily time series of zenith VTEC estimates has an accuracy ranging from a few tenths of a TEC unit (TECU) to approximately 2 TECU. For 73–96% of GPS satellites in view, the daily estimates of SDCBs do not deviate, in absolute value, more than 1 ns from their ground truth values published by the Centre for Orbit Determination in Europe.","Carrier-to-code leveling (CCL); Global navigation satellite system (GNSS); Precise point positioning (PPP); Satellite differential code biases (SDCBs); Thin-layer ionospheric model; Vertical total electron content (VTEC)","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-02-02","","","Mathematical Geodesy and Positioning","","",""
"uuid:9826f308-6e01-49c6-927c-f284bee4a893","http://resolver.tudelft.nl/uuid:9826f308-6e01-49c6-927c-f284bee4a893","A novel Lyapunov function for a non-weighted L2 gain of asynchronously switched linear systems","Yuan, S. (TU Delft Team Bart De Schutter); Zhang, Lixian (Harbin Institute of Technology); De Schutter, B.H.K. (TU Delft Team Bart De Schutter); Baldi, S. (TU Delft Team Bart De Schutter)","","2018","In this paper, a novel Lyapunov function is proposed to study switched linear systems with a switching delay between activation of system modes and activation of candidate controller modes. The novelty consists in continuity of the Lyapunov function at the switching instants and discontinuity when the system modes and controller modes are matched. This structure is exploited to construct a time-varying Lyapunov function that is non-increasing at time instants of discontinuity. Stability criteria based on the novel Lyapunov function are developed to guarantee global asymptotic stability in the noiseless case. Most importantly, when exogenous disturbances are considered, the proposed Lyapunov function can be used to guarantee a finite non-weighted L2 gain for asynchronously switched systems, for which Lyapunov functions proposed in literature are inconclusive. A numerical example illustrates the effectiveness of the proposed method.","Asynchronously switched linear systems; Dwell time; Lyapunov method; Non-weighted L gain","en","journal article","","","","","","","","2019-11-06","","","Team Bart De Schutter","","",""
"uuid:34d0fa1d-c8be-4075-b1b7-d26c503d0fa8","http://resolver.tudelft.nl/uuid:34d0fa1d-c8be-4075-b1b7-d26c503d0fa8","Switched adaptive control of air handling units with discrete and saturated actuators","Yuan, S. (TU Delft Team Bart De Schutter; Harbin Institute of Technology); Zhang, Lixian (Harbin Institute of Technology); Holub, Ondrej (Honeywell Prague Laboratory); Baldi, S. (TU Delft Team Bart De Schutter)","","2018","This letter introduces a new switched adaptive control mechanism that can cope with parametric uncertainty while using discrete and saturated actuators. Control of air handling units (AHUs), where air and water supply have discrete and saturated characteristics, is the motivational drive behind this letter. We show that the cheap actuation and low computational requirements of building automation installations can be met after recasting the AHU thermal dynamics as a switched linear system with discrete working modes. Adaptive laws with anti-windup compensation and a switching law based on dwell time are introduced to cope with the uncertainties and input constraints of the switched linear system. Tracking performance is shown analytically and demonstrated via a numerical test case.","Air handling units; discrete input; dwell time; input saturation; switched adaptive control","en","journal article","","","","","","Accepted Author Manuscript","","","","","Team Bart De Schutter","","",""
"uuid:449945b8-db7c-4faf-88be-4f98606efd09","http://resolver.tudelft.nl/uuid:449945b8-db7c-4faf-88be-4f98606efd09","Advances in delamination modeling of metal/polymer systems: Atomistic aspects","Van Der Sluis, Olaf (Philips Research; Eindhoven University of Technology); Iwamoto, Nancy (Honeywell Performance Materials and Technologies); Qu, Jianmin (Tufts University); Yang, Shaorui (Apple Inc.); Yuan, C.A. (TU Delft Electronic Components, Technology and Materials; Ichijouriki LS R and D); van Driel, W.D. (TU Delft Electronic Components, Technology and Materials; Philips Lighting Research); Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials)","","2018","Adhesion and delamination have been pervasive problems hampering the performance and reliability of micro-and nano-electronic devices. In order to understand, predict, and ultimately prevent interface failure in electronic devices, development of accurate, robust, and efficient delamination testing and prediction methods is crucial. Adhesion is essentially a multi-scale phenomenon: at the smallest scale possible, it is defined by the thermodynamic work of adhesion. At larger scales, additional dissipative mechanisms may be active which results in enhanced adhesion at the macroscopic scale and are the main cause for the mode angle dependency of the interface toughness. Undoubtedly, the macroscopic adhesion properties are a complex function of all dissipation mechanisms across the scales. Thorough understanding of the significance of each of these dissipative mechanisms is of utmost importance in order to establish physically correct, unambiguous, values of the adhesion properties, which can only be achieved by proper multi-scale techniques. The topic “Advances in Delamination Modeling” has been split into two separate chapters: this chapter discusses the atomistic aspects of delamination, while the preceding chapter deals with the atomistic aspects of interface separation. The chapter starts with a concise overview of molecular simulation strategies. Next, examples are provided which represent actual materials being developed for electronic packaging: (1) the prediction of thermomechanical properties of an epoxy molding compound (EMC) and the adhesion properties of an EMC/copper interface by means of MD and CG MD approaches; (2) the modeling of wetting, adhesion, and reliability cycling of die attach and via fills; (3) model scaling to discrete element modeling (DEM) for understanding underfill flow; (4) CG modeling of an epoxy molding compound which relates to the first example; (5) molecular modeling of silicate layers used in planarization and encapsulant layers for flat panel displays; (6) mesoscale modeling of diffusion of organic bases which is of concern to photoresist poisoning; and (7) the prediction of thermomechanical properties of a low-k dielectric material, SiOC:H.","","en","book chapter","Springer","","","","","","","2021-05-27","","","Electronic Components, Technology and Materials","","",""
"uuid:09192ff6-c894-4862-9ce8-999c9b84f3e6","http://resolver.tudelft.nl/uuid:09192ff6-c894-4862-9ce8-999c9b84f3e6","Potential impact of methyl isobutyl ketone (MIBK) on phenols degradation in an UASB reactor and its degradation properties","Wang, Wei (Hefei University of Technology); Yang, Kai (Hefei University of Technology); Muñoz Sierra, Julian (TU Delft Sanitary Engineering); Zhang, X. (TU Delft Sanitary Engineering); Yuan, Shoujun (Hefei University of Technology); Hu, Zhenhu (Hefei University of Technology)","","2017","Methyl isobutyl ketone (MIBK) as a solvent is extensively used for the phenols extraction from the wastewater, so it is unavoidable to expose in the effluent due to the solubility and leakage problem. The present study evaluated the impact of MIBK on phenols degradation in an UASB reactor and analyzed its degradation properties. The results indicated that the continuous dosing (0.1 g L−1) and impact (10 g L−1) of MIBK had limited effect on phenols removal (1–2% reduction) in the UASB reactor, but the specific methanogenic activity (SMA) values of sludge decreased by 45–75% after MIBK exposure. Anaerobic degradation rate of MIBK fitted well to a pseudo-first-order kinetic equation with respect to the initial concentration of 35 mg L−1 (k = 0.0115 h−1, R2 = 0.9664). Furthermore, the relative methane generation rate constants of MIBK were 0.00816, 0.00613, 0.00273, and 0.00207 d−1 at the initial concentrations of 0.1, 0.5, 5, and 10 g L−1, respectively. MIBK showed higher inhibitory effect on the methanogenesis than on phenols degradation. This study pointed out that the industrial installations should consider the influence of solvent on anaerobic treatment of phenolic wastewater.","Methyl isobutyl ketone; Phenolic compounds; Solvent; Specific methanogenic activity; UASB","en","journal article","","","","","","","","2019-03-22","","","Sanitary Engineering","","",""
"uuid:0d852990-d6f3-4f57-8ecf-a3a2acbd7fb9","http://resolver.tudelft.nl/uuid:0d852990-d6f3-4f57-8ecf-a3a2acbd7fb9","Adaptive tracking of switched nonlinear systems with prescribed performance using a reference-dependent reparametrisation approach","Yuan, S. (TU Delft Team Bart De Schutter); Zhang, F. (Southeast University); Baldi, S. (TU Delft Team Bart De Schutter)","","2017","In this paper, adaptive tracking control of switched nonlinear systems in the parametric strict-feedback form is investigated. After defining a reparametrisation lemma in the presence of a non-zero reference signal, we propose a new adaptive backstepping design of the virtual controllers that can handle the extra terms arising from the reparametrisation (and that the state-of-the-art backstepping designs cannot dominate). The proposed adaptive design guarantees, under arbitrarily fast switching, an a priori bound for the steady-state performance of the tracking error and a tunable bound for the transient error. Finally, the proposed method, by overcoming the need for subsystems with common sign of the input vector field, enlarges the class of uncertain switched nonlinear systems for which the adaptive tracking problem can be solved. A numerical example is provided to illustrate the proposed control scheme.","Adaptive tracking control; arbitrarily fast switching; global ultimate boundedness; switched nonlinear systems","en","journal article","","","","","","","","","","","Team Bart De Schutter","","",""
"uuid:a444d969-7855-4e89-b685-d6e3f772fb65","http://resolver.tudelft.nl/uuid:a444d969-7855-4e89-b685-d6e3f772fb65","A plasmonic spanner for metal particle manipulation","Zhang, Y.; Shi, W.; Shen, Z.; Man, Z.; Min, C.; Shen, J.; Zhu, S.; Urbach, H.P.; Yuan, X.","","2015","Typically, metal particles are difficult to manipulate with conventional optical vortex (OV) tweezers, because of their strong absorption and scattering. However, it has been shown that the vortex field of surface plasmonic polaritons, called plasmonic vortex (PV), is capable of stable trapping and dynamic rotation of metal particles, especially those of mesoscopic and Mie size. To uncover the different physical mechanisms of OV and PV tweezers, we investigated the force distribution and trapping potential of metal particles. In OV tweezers the stronger scattering force causes a positive potential barrier that repels particles, whereas in PV tweezers the dominant gradient force contributes to a negative potential well, resulting in stably trapped particles. Compared with OV, the orbital angular momentum of PV produces an azimuthal scattering force that rotates the trapped particles with more precise radius and position. Our results demonstrate that PV tweezers are superior in manipulation of metal particles.","","en","journal article","Nature Publishers Group","","","","","","","","Applied Sciences","ImPhys/Imaging Physics","","","",""
"uuid:32c461a3-1ffb-46de-990d-752966c5bb60","http://resolver.tudelft.nl/uuid:32c461a3-1ffb-46de-990d-752966c5bb60","Dynamic plasmonic beam shaping by vector beams with arbitrary locally linear polarization states","Man, Z.; Du, L.; Min, C.; Zhang, Y.; Zhang, C.; Zhu, S.; Urbach, H.P.; Yuan, X.C.","","2014","Vector beams, which have space-variant state of polarization (SOP) comparing with scalar beams with spatially homogeneous SOP, are used to manipulate surface plasmon polarizations (SPPs). We find that the excitation, orientation, and distribution of the focused SPPs excited in a high numerical aperture microscopic configuration highly depend on the space-variant polarization of the incident vector beam. When it comes to vector beam with axial symmetry, multi-foci of SPPs with the same size and uniform intensity can be obtained, and the number of foci is depending on the polarization order n. Those properties can be of great value in biological sensor and plasmonic tweezers applications.","","en","journal article","American Institute of Physics","","","","","","","","Applied Sciences","ImPhys/Imaging Physics","","","",""
"uuid:9faceaa8-05c0-4f5d-92ec-53fea48e4fdb","http://resolver.tudelft.nl/uuid:9faceaa8-05c0-4f5d-92ec-53fea48e4fdb","Engineered Tumor Cell Apoptosis Monitoring Method Based on Dynamic Laser Tweezers","Zhang, Y.; Wu, X.; Min, C.; Zhu, S.; Urbach, H.P.; Yuan, X.","","2014","Monitoring the cells’ apoptosis progression could provide a valuable insight into the temporal events that initiate cell death as well as the potential for rescue of apoptotic cells. In this paper, we engineered a novel and robust method for monitoring apoptosis of tumor cells based on dynamic laser tweezers, using A549 and HeLa cell line as typical samples. The entire experiment can be completed in a few hours with small amount of fluid sample, presenting great advantages of celerity, microscaled measurement, and label-free explorations without perturbing experimental conditions in combination with other probes. Validity and stability of this method are verified experimentally in terms of physical parameters of the system. The proposed technique has great potential in improving cancer treatment by monitoring the objective efficacy of tumor cell killing.","","en","journal article","Hindawi","","","","","","","","Applied Sciences","Imaging Physics","","","",""
"uuid:d168a0e7-aa62-4d05-a615-a5a18dc1ec57","http://resolver.tudelft.nl/uuid:d168a0e7-aa62-4d05-a615-a5a18dc1ec57","LES-based numerical analysis of surface-pressure fluctuations and unsteady thrust of a marine propeller","Tian, J.; Yang, H.; Zhang, Z.; Yuan, G.; Rao, Z.; Hua, H.","","2014","","resistance & propulsion","","conference paper","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","Ship Hydromechanics and Structures","","",""
"uuid:46c23c35-30fe-43e0-a4a1-ab9200627d11","http://resolver.tudelft.nl/uuid:46c23c35-30fe-43e0-a4a1-ab9200627d11","Intrinsic self-healing of polymer solid while keeping integrity and load-bearing capability","Rong, M.Z.; Zhang, M.Q.; Yuan, C.E.; Wang, F.","","2013","Generally, intrinsic self-healing polymers based on reversible covalent bonds scission and reconnection would lose their load bearing capability as a result of molecular cleavage during healing process. This shortcoming also results in creep deformation of the products. To solve the problem, we introduce a novel healing mechanism by using dynamically reversible C-ON bonds. Upon heating to a certain homolysis temperature, C-ON bonds in alkoxyamines moieties frequently cleave but immediately recombine. When alkoxyamines are incorporated into polymer chains, C-ON covalent bonds fission and recombination synchronously take place with very high frequency, and the equilibrium tends to the combination side. Cracked parts can thus be restored through chemical exchange reaction of alkoxyamine moieties. More importantly, because a large amount of C-ON bonds remain connection, the possible material deformation in the course of crack remending could be avoided. Here, crosslinked polystyrenes and epoxy with alkoxyamine moieties are synthesized as model polymers to prove feasibility of the above considerations. It is shown that the polymers can repeatedly self-heal cracks without deformation induced by chain scission, and provides the polymer with mechanical stability at elevated temperature as well. Moreover, the healing can be conducted within a wide temperature range when different alkoxyamines moieties are used. Molecular structures of alkoxyamines moieties, as well as thermodynamic behavior of C-ON bonds scission and recombination, etc., are studied in detail to optimize selfhealing behavior of the polymers. Full reversibility can be acquired when only one type of C-ON bond is included in the polymers. Accordingly, synthesis routes, molecular structures, thermally reversible characteristics, self-healing performance and self-healing mechanism, thermal stability and thermal-mechanical properties, etc, have been studied in detail.","polymer solid; intrinsic self-healing; alkoxyamines moieties; thermally dynamic reversible; load-bearing capability","en","conference paper","","","","","","","","","","","","","",""
"uuid:1b335e74-1314-4f29-8a0a-81838aabfa0e","http://resolver.tudelft.nl/uuid:1b335e74-1314-4f29-8a0a-81838aabfa0e","Establishment of the coarse grained parameters for epoxy-copper interfacial separation","Wong, C.K.Y.; Leung, S.Y.Y.; Poelma, R.H.; Jansen, K.M.B.; Yuan, C.C.A.; Van Driel, W.D.; Zhang, G.","","2012","Atomistic coarse grained parameters were calculated from a non-equilibrium molecular dynamics simulation of the separation of an epoxy-copper interface. The methodology to determine the interaction energy and the equilibrium distance between the interfacial materials at a minimum energy is established. The traction-displacement relations of the separation under the influence of time taken for atomic interaction, displacement step, and molecular size have been studied. The study illustrates that the control of the time step in the molecular dynamics models is important to ensure a proper separation simulation. The result shows close matching with the thermodynamics work of adhesion. An analytical scheme to determine the coarse grained parameters from the relations is discussed. The proposed methodology contributes to the interpretation of interfacial adhesion beyond the continuum framework.","adhesion; copper; interface structure; metal-insulator boundaries; molecular dynamics method; resins","en","journal article","American Physical Society","","","","","","","","Delft University of Technology","","","","",""
"uuid:c83f4942-9482-4bb7-96e2-39c185a49b11","http://resolver.tudelft.nl/uuid:c83f4942-9482-4bb7-96e2-39c185a49b11","Molecular modeling of temperature dependence of solubility parameters for amorphous polymers","Chen, X.; Yuan, C.; Wong, C.K.Y.; Zhang, G.","","2011","A molecular modeling strategy is proposed to describe the temperature (T) dependence of solubility parameter (?) for the amorphous polymers which exhibit glass-rubber transition behavior. The commercial forcefield “COMPASS” is used to support the atomistic simulations of the polymer. The temperature dependence behavior of ? for the polymer is modeled by running molecular dynamics (MD) simulation at temperatures ranging from 250 up to 650 K. Comparing the MD predicted ? value at 298 K and the glass transition temperature (T g) of the polymer determined from ?–T curve with the experimental value confirm the accuracy of our method. The MD modeled relationship between ? and T agrees well with the previous theoretical works. We also observe the specific volume (v), cohesive energy (U coh), cohesive energy density (E CED) and ? shows a similar temperature dependence characteristics and a drastic change around the T g. Meanwhile, the applications of ? and its temperature dependence property are addressed and discussed.","glass transition temperature; molecular simulation; solubility parameter","en","journal article","Springer","","","","","","","","Mechanical, Maritime and Materials Engineering","Precision and Microsystems Engineering","","","",""
"uuid:cfb18caf-3625-4d87-82ce-5fc2132b2cd1","http://resolver.tudelft.nl/uuid:cfb18caf-3625-4d87-82ce-5fc2132b2cd1","Evaluation and selection of sensing materials for carbon dioxide (CO2) sensor by molecular modeling","Chen, X.P.; Wong, C.K.Y.; Yuan, C.A.; Zhang, G.Q.","","2011","We report a molecular modeling study to evaluate and select conducting polymers (CPs) as the sensing materials of carbon dioxide (CO2) sensor. The interaction between polymer and gas and the adsorption of the gas molecules in the polymer matrix are investigated. Polymers considered for this work include emeraldine base polyaniline (EB–PANI) and unprotonated sodium polyaniline salt (NaSPANI) with sulfur to nitrogen ratio (S/N) of 0.4, 0.5 and 0.6. Gases studied include CO2, humidity (H2O) and carbonic acid (H2CO3). The interaction energies of polymer-gas and the loading number of the analytes predict that the NaSPAN is more suitable for CO2 sensing than the EB–PANI.","polyaniline; CO2 sensor; grennhouse; molecular modeling","en","journal article","Elsevier","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics","","","",""
"uuid:40870a9c-74ba-429e-b302-2665d21bc630","http://resolver.tudelft.nl/uuid:40870a9c-74ba-429e-b302-2665d21bc630","Forcefields based molecular modeling on the mechanical and physical properties of emeraldine base polyaniline","Chen, X.; Yuan, C.A.; Wong, K.Y.; Zhang, G.Q.","","2010","Molecular dynamics (MD) and molecular mechanical (MM) analysis are carried out to provide reliable and accurate model for emeraldine base polyaniline. This study validate the forcefields and model with the physical and mechanical properties of the polyaniline. The temperature effects on non-bond energy, potential energy and solubility parameter during the transformation from the rubbery to the glassy state have been analysed in this work. A new method using the solubility versus temperature (??T)(??T) curve for predicting the TgTg of polymer are suggested.","Emeraldine base; molecular dynamics; forcefields; glass transition","en","journal article","Elsevier","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics","","","",""
"uuid:9e3cfaa2-7316-4c9d-9148-672c1dbad741","http://resolver.tudelft.nl/uuid:9e3cfaa2-7316-4c9d-9148-672c1dbad741","Molecular simulation strategy for mechanical modeling of amorphous/porous low-dielectric constant materials","Yuan, C.A.; Van der Sluis, O.; Zhang, G.Q.; Ernst, L.J.; Van Driel, W.D.; Flower, A.E.; Van Silfhout, B.R.","","2008","We propose an amorphous/porous molecular connection network generation algorithm for simulating the material stiffness of a low-k material (SiOC:H). Based on a given concentration of the basic building blocks, this algorithm will generate an approximate and large amorphous network. The molecular topology is obtained by distributing these blocks randomly into a predefined framework. Subsequently, a structural relaxation step including local and global perturbations is applied to achieve the most likely stereochemical structure. Thus, the obtained mechanical properties of the low-k materials have been verified with the experimental data.","amorphous state; molecular dynamics method; permittivity; porous materials; silicon compounds","en","journal article","American Institute of Physics","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics & Computer Engineering","","","",""
"uuid:abd01050-f2b4-4202-af1f-469f90f6d7e4","http://resolver.tudelft.nl/uuid:abd01050-f2b4-4202-af1f-469f90f6d7e4","Numerical simulation on the mechanical characteristics of double-stranded DNA under axial stretching and lateral unzipping","Yuan, C.A.; Zhang, G.Q.; Han, C.N.; Chiang, K.N.; Cui, Y.","","2007","The mechanical characteristics of the long-chain double-stranded DNA (dsDNA) molecule under the axial stretching and lateral unzipping are studied by the clustered atomistic-continuum method (CACM). The CACM consisted of the clustered atom method (CAM) and the atomistic-continuum method (ACM). The CAM treats the specific atomic group as the superatom, and the ACM describes the chemical binding energies between (super)atoms by virtual elements. The Newtonian based model of the dsDNA includes the superatoms of the backbones?base pairs and the virtual elements of the stacking energies?hydrogen bonds. The effective properties of the superatoms are numerically extracted from the single-stranded DNA experiments. Good agreements were achieved between the dsDNA numerical results and the single molecular experimental results. Via the simulation of stretching dsDNA, the mechanical responses, including the twisting of the backbone and variation of the elastic deformation energy and stacking energy, can be elucidated. Moreover, the predictive capability of the dsDNA CACM model is then examined. Furthermore, the dsDNA model with sequential information is subjected to the unzipping loading, and the in silico results reveal that the sliding of the backbones and the sequential dependent mechanical responses.","DNA; molecular biophysics; biomechanics","en","journal article","American Institute of Physics","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Microelectronics & Computer Engineering","","","",""
"uuid:c7e71b85-629c-4d1b-9fbf-1e9ba8761081","http://resolver.tudelft.nl/uuid:c7e71b85-629c-4d1b-9fbf-1e9ba8761081","Mechanical Characterization of III-V Nanowire Using Molecular Dynamics Simulation","Dawotola, A.W.; Yuan, C.A.; Van Driel, W.D.; Bakkers, E.P.A.M.; Zhang, G.Q.","","2007","","","en","conference paper","IEEE","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""
"uuid:76b2ee0d-7c39-4426-ad1c-7825965cb4e0","http://resolver.tudelft.nl/uuid:76b2ee0d-7c39-4426-ad1c-7825965cb4e0","The chemical-mechanical relationship of the SiOC(H) dielectric film","Yuan, C.; Van Der Sluis, O.; Zhang, G.Q.; Ernst, L.J.; Van Driel, W.D.; Van Silfhout, R.B.R.; Thijsse, B.J.","","2007","","","en","conference paper","IEEE","","","","","","","","Mechanical Maritime and Materials Engineering","","","","",""