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Deng, Q. (author)Aircraft maintenance is the process of overhaul, repair, inspection, or modification of an aircraft or aircraft systems, components, and structures, to keep these in an airworthy condition. Airlines must perform regular maintenance on their fleet to keep their aircraft airworthy and, ultimately, prevent any systems or components failures during...doctoral thesis 2021
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Liu, Bangan (author), Zhang, Yuncheng (author), Qiu, Junjun (author), Ngo, Huy Cu (author), Deng, Wei (author), Nakata, Kengo (author), Yoshioka, Toru (author), Emmei, Jun (author), Pang, Jian (author), Someya, T. (author)In this paper, a fully-synthesizable digital-to-time (DTC)-based fractional-N multiplying delay-locked loop,(MDLL) is presented. Noise and linearity of synthesizable DTCs are analyzed, and a two-stage synthesizable DTC is proposed in which a path-selection DTC is used as the coarse stage and a variable-slope DTC is used as the fine stage. To...journal article 2021
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Lin, Richen (author), Deng, Chen (author), Zhang, Wuyuan (author), Hollmann, F. (author), Murphy, Jerry D. (author)Bioelectrochemical technologies such as electro-fermentation and microbial CO<sub>2</sub> electrosynthesis are emerging interdisciplinary technologies that can produce renewable fuels and chemicals (such as carboxylic acids). The benefits of electrically driven bioprocesses include improved production rate, selectivity, and carbon conversion...review 2021
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Deng, Z. (author), He, Qing (author), Chassagne, C. (author), Wang, Zhengbing (author)The variation of the floc population in the Changjiang Estuary has been studied for both winter and summer season as a function of the presence of living (micro)algae. The influence of algae has been characterized through the use of the chlorophyll-a concentration to suspended sediment concentration (CC/SSC) ratio. Two whole tidal cycle...journal article 2021
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Deng, Q. (author), Santos, Bruno F. (author)This paper proposes a lookahead approximate dynamic programming methodology for aircraft maintenance check scheduling, considering the uncertainty of aircraft daily utilization and maintenance check elapsed time. It adopts a dynamic programming framework, using a hybrid lookahead scheduling policy. The hybrid lookahead scheduling policy makes...journal article 2021
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Deng, X. (author), Meerman, C. (author), Boelens, T. (author), De Mulder, T. (author), Salles, P. (author), Schuttelaars, H.M. (author)The existence of morphodynamic equilibria of double-inlet systems is investigated using a cross-sectionally averaged morphodynamic model. The number of possible equilibria and their stability strongly depend on the forcing conditions and geometry considered. This is illustrated by considering a rectangular double-inlet system forced by M<sub...journal article 2021
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van der Weide, Tim (author), Deng, Q. (author), Santos, Bruno F. (author)Long-term heavy maintenance check schedules are crucial in the aviation industry since airlines need them to prepare the required maintenance tools, workforce, and aircraft spare parts. However, most airlines adopt a manual approach to plan the heavy maintenance check schedules in current practice. This manual process relies on the experience of...journal article 2021
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Deng, Z. (author), van Linden, N. (author), Guillen, Elena (author), Spanjers, H. (author), van Lier, J.B. (author)Total ammoniacal nitrogen (TAN) is considered to be a pollutant, but is also a versatile resource. This review presents an overview of the TAN recovery potentials from nitrogen (N)-loaded residual streams by discussing the sources, recovery technologies and potential applications. The first section of the review addresses the fate of TAN...review 2021
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Shen, C. (author), Deng, X. (author), Wei, Z. (author), Dollevoet, R.P.B.J. (author), Zoeteman, A. (author), Li, Z. (author)A singular rail or wheel surface irregularity, such as a squat, insulation joint or wheel flat, can cause large wheelrail impact force. Both the magnitude and frequency content of the impact force need to be correctly modelledbecause they are closely related to the formation, deterioration and detection of such irregularities. In this paper,we...journal article 2021
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Sun, Y. (author), Kang, Xuanwu (author), Deng, Shixiong (author), Zheng, Yingkui (author), Wei, Ke (author), Xu, Linwang (author), Wu, Hao (author), Liu, Xinyu (author)We report a high-performance GaN Schottky barrier diode (SBD) on a sapphire substrate with a novel post-mesa nitridation technique and its application in a high-power microwave detection circuit. The fabricated SBD achieved a very high forward current density of 9.19 kA cm-2 at 3 V, a low specific on-resistance (RON,sp) of 0.22 mO cm2 and...journal article 2021
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Sun, Y. (author), Kang, Xuanwu (author), Deng, Shixiong (author), Zheng, Yingkui (author), Wei, Ke (author), Xu, Linwang (author), Wu, Hao (author), Liu, Xinyu (author)Gallium nitride (GaN) has attracted increased attention because of superior material properties, such as high electron saturation velocity and high electrical field strength, which are promising for high-power microwave applications. We report on a high-performance vertical GaN-based Schottky barrier diode (SBD) and its demonstration in a...journal article 2021
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Witteman, Max (author), Deng, Q. (author), Santos, Bruno F. (author)This paper addresses the scheduling of aircraft maintenance tasks that must be carried out in multiple maintenance checks to keep a fleet of aircraft airworthy. The allocation of maintenance tasks to maintenance opportunities, also known as the task allocation problem (TAP), is a complex combinatorial problem that needs to be solved daily by...journal article 2021
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Liu, D. (author), Song, X. (author), Deng, Fujin (author), Dong, J. (author)High-Temperature superconducting (HTS) generators are being considered as a competitive candidate in large direct-drive (DD) wind turbines because of their features of being lightweight and compact. Normally a large air gap is inevitable in partially HTS generators, sacrificing the torque producing capability. In this paper, multi-phase...journal article 2020
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Deng, Q. (author), Santos, Bruno 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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Fan, J. (author), Wu, Jie (author), Jiang, Changzhen (author), Zhang, H. (author), Ibrahim, M.S. (author), Deng, Liang (author)To make the light-emitting diode (LED) more compact and effective, the flip chip solder joint is recommended in LED chip-scale packaging (CSP) with critical functions in mechanical support, heat dissipation, and electrical conductivity. However, the generation of voids always challenges the mechanical strength, thermal stability, and...journal article 2020
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Li, Jie (author), van Zuylen, H.J. (author), Deng, Yuansheng (author), Zhou, Yun (author)Data recorded by Automated Number Plate Recognition (ANPR) cameras can be used to determine several important traffic characteristics, such as real time travel time, travel time statistics, travel time reliability and OD matrices. In this paper ANPR data collected in Chinese city Changsha have been validated. Travel time extracted from ANPR...journal article 2020
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Deng, Wen Jing (author), Hoekstra, J.S.C.M. (author), Elsinga, M.G. (author)Worldwide, housing is increasingly unaffordable for young people, many of whom rely on intergenerational transfers of assets to enter home ownership. This paper aims to qualitatively analyze the impacts of the welfare state and family reciprocity on young people's opportunity to access home ownership. Evidence from in-depth interviews with...journal article 2020
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Fan, Xiangyu (author), Bai, Peng (author), Huanyu, L. I. (author), Deng, Xiongfeng (author), Lv, Maolong (author)In this paper, the finite-time tracking control problem of a class of multi-agent systems with nonaffine functions and uncertain nonlinearity is investigated, which is different from the existing on high-order multi-agent systems with pure feedback forms. The multi-agent systems considered in this paper, moreover, the nonaffine functions and...journal article 2020
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Deng, X. (author)One goal of this thesis is to study the performance and accuracy of an explicit finite element (FE) method for frictional rolling contact in a wider-range of conditions. The other goal is to reveal the physical phenomena of squats and the mechanisms behind, such as cracking mechanisms and development process. The first part studies the...doctoral thesis 2019
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Yang, Z. (author), Deng, X. (author), Li, Z. (author)The modeling of dynamic frictional rolling contact is crucial for accurately predicting behavior and deterioration of structures under dynamic interactions such as wheel/rail, tire/road, bearings and gears. However, reliable modeling of dynamic frictional rolling contact is challenging, because it requires a careful treatment of friction and...journal article 2019