"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:b28ffd2a-809c-4cf7-8bac-59e9baec38ee","http://resolver.tudelft.nl/uuid:b28ffd2a-809c-4cf7-8bac-59e9baec38ee","Analysis of Urban Built Environment Impacts on Outdoor Physical Activities: A Case Study in China","Li, Bo (Central South University China); Liu, Qiuhong (Central South University China); Wang, T. (TU Delft Design & Construction Management); He, He (Central South University China); Peng, You (Eindhoven University of Technology); Feng, Tao (Hiroshima University)","","2022","Outdoor physical activities can promote public health and they are largely influenced by the built environment in different urban settings. Understanding the association between outdoor physical activities and the built environment is important for promoting a high quality of life. Existing studies typically focus on one type of outdoor activity using interview-based small samples and are often lack of systematic understanding of the activities' intensity and frequency. In this study, we intend to gain deeper insight into how the built environment influences physical activities using the data extracted from individual's wearables and other open data sources for integrated analysis. Multi-linear regression with logarithm transformation is applied to perform the analysis using the data from Changsha, China. We found that built environment impacts on outdoor physical activities in Changsha are not always consistent with similar studies' results in other cities. The most effective measures to promote outdoor physical activities are the provision of good arterial and secondary road networks, community parks, among others in Changsha. The results shed light on future urban planning practices in terms of promoting public health","public health; urban planning; GPS tracking; intensity and frequency; trajectory analysis; smart wearables","en","journal article","","","","","","","","","","","Design & Construction Management","","",""
"uuid:fd2252b4-7110-445c-967b-cbdaaf497b94","http://resolver.tudelft.nl/uuid:fd2252b4-7110-445c-967b-cbdaaf497b94","Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved Tube","Liu, Xinxin (Henan Agricultural University); Li, Shuoshuo (Henan Agricultural University); Liu, Liang (Henan Agricultural University); He, Chao (Henan Agricultural University); Sun, Zhuang (University of Tokyo); Özdemir, F. (TU Delft Energy Technology); Aziz, Muhammad (University of Tokyo); Kuo, Po-Chih (University of Tokyo)","","2022","Because of their compact structure, ease of processing and higher heat transfer coefficient, curved-tube heat exchangers are widely applied in various industry applications, such as nuclear power systems, solar-powered engineering, aircraft engine cooling systems and refrigeration and cryogenic systems. Accurate knowledge about the heat transfer characteristics of the supercritical fluids in the tube is critical to the design and optimization of a curved-tube heat exchanger. The available literature indicates that the flow of supercritical fluids flowing in curved tubes affected by the dual effects of the buoyancy force and centrifugal force is more complex compared to straight tubes. Therefore, to obtain insight into their unique characteristics and further research progress, this paper presents a comprehensive review of available experimental and numerical research works on fluids at supercritical pressure flowing in curved tubes. Overall, the secondary flow caused by the curvature enhances the heat transfer and delays the heat transfer deterioration, but it also causes a non-uniform heat transfer distribution along the circumferential direction, and the strengthening performance of the curved tube is damaged. Compared with the more mature theories regarding straight tubes, the flow structure, the coupling mechanism of buoyancy and centrifugal force, and the general heat transfer correlation of supercritical fluids in a curved tube still urgently need to be further studied. Most importantly, studies on the suppression of heat transfer oscillations and heat transfer inhomogeneities specific to curved tubes are scarce. Considering the current status and shortcomings of existing studies, some study topics for supercritical fluids in a curved tube are proposed","heat transfer characteristics; supercritical fluids; curved tube; heat transfer enhancement; buoyancy force; centrifugal force","en","journal article","","","","","","","","","","","Energy Technology","","",""
"uuid:806ab43b-61bf-4838-bb06-596e5ef71468","http://resolver.tudelft.nl/uuid:806ab43b-61bf-4838-bb06-596e5ef71468","Thickness-Independent Capacitive Performance of Holey Ti3C2Tx Film Prepared through a Mild Oxidation Strategy","Guo, R. (TU Delft RST/Storage of Electrochemical Energy; Shaanxi Normal University); Yuan, Peng (Shaanxi Normal University); Han, Xiying (Shaanxi Normal University); He, Xuexia (Shaanxi Normal University); Lu, Jiangbo (Shaanxi Normal University); Li, Qi (Shaanxi Normal University); Dang, Liqin (Shaanxi Normal University); Sun, Jie (Shaanxi Normal University); Liu, Zonghuai (Shaanxi Normal University); Lei, Zhibin (Shaanxi Normal University)","","2022","The Ti3C2Tx film with metallic conductivity and high pseudo-capacitance holds profound promise in flexible high-rate supercapacitors. However, the restacking of Ti3C2Tx sheets hinders ion access to thick film electrodes. Herein, a mild yet green route has been developed to partially oxidize Ti3C2Tx to TiO2/Ti3C2Tx by introducing O2 molecules during refluxing the Ti3C2Tx suspension. The subsequent etching away of these TiO2 nanoparticles by HF leaves behind numerous in-plane nanopores on the Ti3C2Tx sheets. Electrochemical impedance spectroscopy shows that longer oxidation time of 40 min yields holey Ti3C2Tx (H-Ti3C2Tx) with a much shorter relax time constant of 0.85 s at electrode thickness of 25 µm, which is 89 times smaller than that of the pristineTi3C2Tx film (75.58 s). Meanwhile, H-Ti3C2Tx film with 25 min oxidation exhibits less-dependent capacitive performance in film thickness range of 10–84 µm (1.63–6.41 mg cm−2) and maintains around 60% capacitance as the current density increases from 1 to 50 A g−1. The findings clearly demonstrate that in-plane nanopores not only provide more electrochemically active sites, but also offer numerous pathways for rapid ion impregnation across the thick Ti3C2Tx film. The method reported herein would pave way for fabricating porous MXene materials toward high-rate flexible supercapacitor applications.","capacitive performances; controllable oxidation; holey Ti C T; supercapacitors; thick film electrodes","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","","","RST/Storage of Electrochemical Energy","","",""
"uuid:9c48a6a8-5615-4848-8799-738a84baca07","http://resolver.tudelft.nl/uuid:9c48a6a8-5615-4848-8799-738a84baca07","Revealing the Impact of Space-Charge Layers on the Li-Ion Transport in All-Solid-State Batteries","Cheng, Zhu (Nanjing University); Liu, M. (TU Delft RST/Storage of Electrochemical Energy); Ganapathy, S. (TU Delft RID/TS/Instrumenten groep); Li, Z. (TU Delft RST/Storage of Electrochemical Energy); Zhang, Xiaoyu (Nanjing University); He, Ping (Nanjing University); Zhou, Haoshen (Nanjing University; National Institute of Advanced Industrial Science and Technology (AIST)); Wagemaker, M. (TU Delft RST/Storage of Electrochemical Energy); Li, Chau (Nanjing University)","","2020","The influence of space-charge layers on the ionic charge transport over cathode-solid electrolyte interfaces in all-solid-state batteries remains unclear because of the difficulty to unravel it from other contributions to the ion transport over the interfaces. Here, we reveal the effect of the space-charge layers by systematically tuning the space-charge layer on and off between Li xV 2O 5 and Li 1.5Al 0.5Ge 1.5(PO 3) 4 (LAGP), by changing the Li xV 2O 5 potential and selectively measuring the ion transport over the interface by two-dimensional (2D) NMR exchange. The activation energy is demonstrated to be 0.315 eV for lithium-ion exchange over the space-charge-free interface, which increases dramatically to 0.515 eV for the interface with a space-charge layer. Comparison with a space-charge model indicates that the charge distribution due to the space-charge layer is responsible for the increased interface resistance. Thereby, the present work provides selective and quantitative insight into the effect of space-charge layers over electrode-electrolyte interfaces on ionic transport.","2D exchange NMR; interfaces; LAGP; Li-ion diffusion; LiVO; solid-state batteries; space-charge layers","en","journal article","","","","","","","","2021-06-17","","","RST/Storage of Electrochemical Energy","","",""
"uuid:6293181b-1df1-49b0-aeaf-ccae1f092b40","http://resolver.tudelft.nl/uuid:6293181b-1df1-49b0-aeaf-ccae1f092b40","Relational model of accidents and vessel traffic using AIS Data and GIS: A case study of the Western port of Shenzhen City","Li, Mengxia (Wuhan University of Technology; Hubei Key Laboratory of Inland Shipping Technology); Mou, Junmin (Hubei Key Laboratory of Inland Shipping Technology; Wuhan University of Technology); Liu, Rongfang (New Jersey Institute of Technology); Chen, P. (TU Delft Safety and Security Science); Dong, Zhuojian (Hubei Key Laboratory of Inland Shipping Technology; Wuhan University of Technology); He, Yixiong (Hubei Key Laboratory of Inland Shipping Technology; Wuhan University of Technology)","","2019","Following the growth in global trade activities, vessel traffic has increased dramatically in some busy waterways and ports. However, such increments have made it more complex to manage the regional vessel traffic, which can increase the risk of an accident in the area. To model and analyze the relationship between vessel traffic and maritime traffic, this paper proposes a gridded geography information system (GIS)-based relation analysis model using the historical automatic identification system (AIS) data and accident records over a 10-year-span. Firstly, the extent of the hazards posed by a maritime accident in terms of hull loss, fatality, and direct economic loss is quantified using set pair analysis. Consequently, the hazardous degree posed by an accident is obtained. The relative consequence of the regional hazard (RCORH) is then estimated by summing up all the relative hazardous degrees of accidents that have occurred in a certain gridded area. Secondly, the vessel traffic in the gridded areas is analyzed using characteristics such as speed, heading variance, and traffic volume as indicators. Based on the analysis of both the maritime traffic accidents and the vessel traffic, the spatial relationships are analyzed with an overlay between the RCORH and vessel traffic data of each grid, as well as a regression analysis. In a case study of the Western port of Shenzhen City, China, the methodology proves to be effective for vessel traffic management and traffic engineering design.","Collision accident; Maritime safety; Relation model; Set pair analysis; Vessel traffic","en","journal article","","","","","","","","","","","Safety and Security Science","","",""
"uuid:4f87a746-5088-4fc2-b711-15c50be2411b","http://resolver.tudelft.nl/uuid:4f87a746-5088-4fc2-b711-15c50be2411b","Shear capacity of a novel joint between corrugated steel web and concrete lower slab","Wang, Sihao (Tongji University); He, Jun (Changsha University of Science and Technology); Liu, Yuqing (Tongji University); Li, Chuanxi (Changsha University of Science and Technology); Xin, H. (TU Delft Steel & Composite Structures; Tongji University)","","2018","Composite girder with corrugated steel web is one of the promising concrete-steel hybrid structures with superior properties and cost effectiveness widely applied in highway and railway bridges. The connection between concrete slabs and corrugated steel web is an important part of such composite structure. In order to improve pouring quality and durability of concrete for joint structure between corrugated steel webs and concrete lower slab, the validity of placing lower slab on the inner side of corrugated steel webs was confirmed and a new joint structure with perforated plate connectors was proposed. Push-out tests on proposed joint structure with different parameters including the welding width and the plate thickness were carried out to study their shear strength, shear stiffness, failure modes and relative slip characteristics. Subsequently, three-dimensional finite element models taking material non-linearity and nonlinear contact between steel and concrete interface into consideration were built and validated by the push-out tests. Afterwards, parametric studies were performed to further investigate the influences of geometrical parameters (such as width, height and thickness of perforated steel plate) and material parameters including steel yielding strength and concrete compressive strength on ultimate shear strength and failure mode of the joint structure. Analytical results indicate that the shear loading capacity is increased with the thickness, the width and height of perforated plate, and the compressive strength of concrete. However, steel yielding strength, presence or absence of perforating rebar, have a negligible effect on ultimate shear strength of the joint structure. Finally, prediction equations of shear capacity were provided and compared with experimental and numerical results. The calculated shear capacity agrees well with experimental and numerical ones, indicating provided analytical equations can accurately predict shear capacity for such novel joint structure.","Composite girder; Corrugated steel web; Finite element analysis; Joint structure; Push-out tests; Shear capacity","en","journal article","","","","","","","","2020-02-29","","","Steel & Composite Structures","","",""
"uuid:653b09f1-c5c5-4a7c-aeeb-d845dd650302","http://resolver.tudelft.nl/uuid:653b09f1-c5c5-4a7c-aeeb-d845dd650302","Mapping Atlas of Shenzhen - Urban Villages","van Oostrum, Matthijs; Liu, Jiayao; Li, Yishiqin; Hoek, Ruben; Yang, Yidong; He, Zhujun; Buysschaert, Axel; Xiao, Yazhi; Peng, Jiping; van Eijk, Saskia; Yang, Qiao","Qu, L. (editor)","2017","This publication is in response to the call of 2017 Bi-City Biennale of Urbanism\Architecture (Shenzhen) (UABB) “Cities, Grow in Difference”, from the perspective of urbanism: the synthesis of factors that collectively determine the spatial use of the city.
This atlas is based on master graduation theses of Delft University of Technology (TU Delft) from 2013 to 2017. Since 2012, TU Delft collaborated with INTI (International New Town Institute in the Netherlands) for research and education programmes on the development of Shenzhen. In the past 4 years, more than 10 students did their master theses on urban villages in Shenzhen. Materials shown in this atlas are chosen mapping work from these master theses, which visualize the socio-economic and spatial conditions of urban villages in Shenzhen, covering areas from the central urban districts (such as Baishizhou) to the peripheral districts (such as Dalang) and new towns (such as Guangming New Town).","Mapping Atlas; Shenzhen; Urban Village","mul","book","Delft University of Technology","978-94-6186-872-5","","","","","","","","","Spatial Planning and Strategy","","",""
"uuid:71615cd8-8954-431f-8b3c-b145029efcd1","http://resolver.tudelft.nl/uuid:71615cd8-8954-431f-8b3c-b145029efcd1","A Facile Surface Reconstruction Mechanism toward Better Electrochemical Performance of Li4Ti5O12 in Lithium-Ion Battery","Qian, Kun (Tsinghua University); Tang, Linkai (Tsinghua University); Wagemaker, M. (TU Delft RST/Fundamental Aspects of Materials and Energy); He, Yan Bing (Tsinghua University); Liu, Dongqing (Tsinghua University); Li, Hai (Tsinghua University); Shi, Ruiying (Tsinghua University); Li, Baohua (Tsinghua University); Kang, Feiyu (Tsinghua University)","","2017","Through a facile sodium sulfide (Na2S)-assisted hydrothermal treatment, clean and nondefective surfaces are constructed on micrometer-sized Li4Ti5O12 particles. The remarkable improvement of surface quality shows a higher first cycle Coulombic efficiency (≈95%), a significantly enhanced cycling performance, and a better rate capability in electrochemical measurements. A combined study of Raman spectroscopy and inductive coupled plasma emission spectroscopy reveals that the evolution of Li4Ti5O12 surface in a water-based hydrothermal environment is a hydrolysis–recrystallization process, which can introduce a new phase of anatase-TiO2. While, with a small amount of Na2S (0.004 mol L−1 at least), the spinel-Li4Ti5O12 phase is maintained without a second phase. During this process, the alkaline environment created by Na2S and the surface adsorption of the sulfur-containing group (HS− or S2−) can suppress the recrystallization of anatase-TiO2 and renew the particle surfaces. This finding gives a better understanding of the surface–property relationship on Li4Ti5O12 and guidance on preparation and modification of electrode material other than coating or doping.","hydrothermal method; LiTiO; lithium-ion batteries; NaS; surface modifications","en","journal article","","","","","","","","","","","RST/Fundamental Aspects of Materials and Energy","","",""