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de Gouw, Joost A. (author), Veefkind, J.P. (author), Roosenbrand, Esther (author), Dix, Barbara (author), Lin, John C. (author), Landgraf, Jochen (author), Levelt, P.F. (author)
Production of oil and natural gas in North America is at an all-time high due to the development and use of horizontal drilling and hydraulic fracturing. Methane emissions associated with this industrial activity are a concern because of the contribution to climate radiative forcing. We present new measurements from the space-based...
journal article 2020
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An, Tao (author), Mohan, Prashanth (author), Zhang, Yingkang (author), Frey, Sándor (author), Yang, J. (author), Gabányi, Krisztina (author), Gurvits, L. (author), Paragi, Zsolt (author), Perger, Krisztina (author), Zheng, Zhenya (author)
Blazars are a sub-class of quasars with Doppler boosted jets oriented close to the line of sight, and thus efficient probes of supermassive black hole growth and their environment, especially at high redshifts. Here we report on Very Long Baseline Interferometry observations of a blazar J0906 + 6930 at z = 5.47, which enabled the detection of...
journal article 2020
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van der Tuin, M.S. (author), Pel, A.J. (author)
Transport infrastructure owners are moving from reactive toward proactive infrastructure management. This involves computation of costs associated with failure or maintenance, including expected transport delays. These delays are often computed by multiplying additional travel time by the number of travellers. However, this does not reflect...
journal article 2020
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Abdul Madhar, S. (author), Mraz, Petr (author), Rodrigo Mor, A. (author), Ross, R. (author)
Corona is one of the most common forms of partial discharge (PD) occurring in high voltage (HV) energy systems. The corona mechanism in air is not exclusive to the field of energy applications but has also been widely studied by physicists to theorize mechanisms of charge transfer during the different phases of gas discharge. The phases of the...
journal article 2020
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Hoevenaars, A.G.L. (author), Krut, S. (author), Herder, J.L. (author)
The dynamic performance of a parallel manipulator is often limited by its natural frequencies. These frequencies are a result of the controlled actuator stiffness and the mechanical design. Typically, only the lowest natural frequencies are of interest. However, existing methods to analyze natural frequencies of parallel manipulators with...
journal article 2020
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Avallone, F. (author), Ragni, D. (author), Casalino, D. (author)
Lattice-Boltzmann Very-Large-Eddy Simulations of two Diffuser-Augmented Wind Turbines are carried out to investigate the effect of the tip-clearance (TC) ratio on both the flow field and the far-field noise. The DonQi® wind turbine, a three blades ducted rotor with nominal TC of 2.5%, is chosen as reference test case. The second configuration...
journal article 2020
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Ji, Yanjie (author), Ma, Xinwei (author), He, Mingjia (author), Jin, Yuchuan (author), Yuan, Y. (author)
Bike-sharing systems have rapidly expanded around the world. Previous studies found that docked and dockless bike-sharing systems are different in terms of user demand and travel characteristics. However, their usage regularity and its determinants have not been fully understood. This research aims to fill this gap by exploring smart card...
journal article 2020
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Han, Jing (author), Chepuri, Sundeep Prabhakar (author), Leus, G.J.T. (author)
Orthogonal signal-division multiplexing (OSDM) has recently emerged as a promising modulation scheme for underwater acoustic communications. Although providing more flexibility in system design, it suffers from a special interference structure over time-varying channels. To enable reliable OSDM equalization, we propose a joint channel impulse...
journal article 2020
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Cui, Z. (author), Fan, J. (author), van Ginkel, H.J. (author), Fan, Xuejun (author), Zhang, G.Q. (author)
The CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> red phosphor and its silicone/phosphor composite are very promising materials used in the high color rendering white light-emitting diode (LED) packaging. However, the reliabilities of CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> and its composite are still being challenged by phosphor hydrolysis at high...
journal article 2020
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Lai, J. (author), You, X. (author), Dugulan, A.I. (author), Huang, B. (author), Liu, J. (author), Maschek, M. (author), van Eijck, L. (author), van Dijk, N.H. (author), Brück, E.H. (author)
The first-order magneto-elastic transition in the Mn–Fe–P–Si alloys can be tailored by vanadium substitution. Alloys with a suitable V substitution provide an excellent magnetocaloric effect with minor hysteresis in low magnetic fields up to 1.2 T. Mössbauer measurements show that the hyperfine field is reduced by V substitution. Neutron...
journal article 2020
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Ale, B.J.M. (author), Hartford, Des N.D. (author), Slater, David H. (author)
Since Nassim Taleb coined black swan as an event that occurred as a complete surprise for everybody, the metaphor of the black swan has been applied to a much wider variety of events. Black swan events now comprise events that are a surprise for some but not for others, events that have a low likelihood, events that were not believed to be...
journal article 2020
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Ekhtiyari, A. (author), Shokrieh, Mahmood M. (author), Alderliesten, R.C. (author)
The main objective of the present study is to assess the loading rate effects on mode-I delamination growth in glass/epoxy laminated composites. Furthermore, hybrid reinforcement of these composites by incorporating carbon nanofibers (CNFs) was followed to enhance the interlaminar fracture resistance and affect its loading rate sensitivity....
journal article 2020
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Merino Martinez, R. (author), Luesutthiviboon, S. (author), Zamponi, Riccardo (author), Rubio Carpio, A. (author), Ragni, D. (author), Sijtsma, P. (author), Snellen, M. (author), Schram, Christophe (author)
In this paper, the performance of four acoustic imaging methods: conventional frequency domain beamforming (CFDBF), functional beamforming (FUNBF), enhanced high resolution CLEAN–SC (EHR–CLEAN–SC) and generalized inverse beamforming (GIBF), is investigated in terms of accuracy and variability. Three experimental test cases are considered: 1)...
journal article 2020
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Du, Shuoran (author), Hamdi, M. (author), Sue, Hung Jue (author)
Mar is a type of subtle surface damage caused by a sliding object barely visible to human eyes. This minor damage phenomenon has rarely been systematically studied. Significant research efforts for the fundamental understanding of mar behavior in polymers are still needed. In this study, the mar behavior of a series of model amorphous...
journal article 2020
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Deng, Q. (author), Lopes Dos Santos, B.F. (author), Curran, R. (author)
This paper presents a practical dynamic programming based methodology to optimize the long-term maintenance check schedule for a fleet of heterogeneous aircraft. It is the first time that the long-term aircraft maintenance check schedule is optimized, integrating different check types in a single schedule solution. The proposed methodology...
journal article 2020
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Oviedo-Ocaña, E. R. (author), Dominguez, I. C. (author), Celis, J. (author), Blanco, L. C. (author), Cotes, I. (author), Ward, S. (author), Kapelan, Z. (author)
Urban areas are facing challenges for the provision of public services, with water scarcity arising as one of the main problems. A twin track approach of supply and demand management is essential, and water-loss management contributes to reducing water demand. However, small municipalities from developing countries have technical, information...
journal article 2020
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Saleh, M.A.S.N. (author), Saeedifar, M. (author), Zarouchas, D. (author), Teixeira De Freitas, S. (author)
Mechanics of double-lap Steel-to-CFRP adhesively-bonded joints loaded in tension are investigated experimentally using Digital Image Correlation (DIC) and Acoustic Emission (AE), analytically using a one-dimensional closed-form solution and numerically with Finite Element analysis. The double-lap bi-material joints are fabricated of a steel core...
journal article 2020
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Quan, D. (author), Mischo, Chiara (author), Binsfeld, Lucas (author), Ivankovic, Alojz (author), Murphy, Neal (author)
Polyphenylene-sulfide (PPS) veils doped with MWCNTs and graphene nanoplatelets (GNPs) were used as interleaves of a carbon fibre/epoxy composite, aiming to study its effects on the fracture performance. Interlaying original PPS veils significantly improved the mode-I and mode-II fracture toughness of the laminates due to a PPS fibre bridging...
journal article 2020
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Sun, B. (author), van Kampen, E. (author)
A novel adaptive dynamic programming method, called incremental model-based global dual heuristic programming, is proposed to generate a self-learning adaptive flight controller, in the absence of sufficient prior knowledge of system dynamics. An incremental technique is employed for online local dynamics identification, instead of the...
journal article 2020
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Farajzadeh, R. (author), Eftekhari, A. A. (author), Dafnomilis, I. (author), Lake, L. W. (author), Bruining, J. (author)
This work uses pilot examples of CO<sub>2</sub> enhanced oil recovery to analyze whether and under which circumstances it is exergetically favorable to sequester CO<sub>2</sub> through enhanced oil recovery. We find that the net storage efficiency (ratio between the stored and captured CO<sub>2</sub>) of the carbon capture and storage (CCS)...
journal article 2020
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