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Sun, J. (author), Hu, D. (author), Liu, Zewen (author), Middelburg, L.M. (author), Vollebregt, S. (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A micro-scale pressure sensor based on suspended AlGaN/GaN heterostructure is reported with non-linear sensitivity. By sealing the cavity, vacuum sensing at various temperatures was demonstrated. To validate the proposed concept of the AlGaN/GaN vacuum sensor, a 700 µm diameter circular membrane was electrically characterized under applied...journal article 2020
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Li, Huajian (author), Sun, Deyi (author), Wang, Zhen (author), Huang, Fali (author), Yi, Zhonglai (author), Yang, Zhengxian (author), Zhang, Y. (author)Pumping is the most common technique used to transport fresh concrete in construction sites. The large-scale use of concrete all over the world makes the pumping increasingly important. A wide variety of additives and admixtures are incorporated into modern concrete in order for sustainable development. The performance of modern concrete is...journal article 2020
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Sun, J. (author), Sokolovskij, R. (author), Iervolino, E. (author), Liu, Zewen (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)We developed an AlGaN/GaN high electron mobility transistor (HEMT) sensor with a tungsten trioxide (WO<sub>3</sub>) nano-film modified gate for nitrogen dioxide (NO<sub>2</sub>) detection. The device has a suspended circular membrane structure and an integrated micro-heater. The thermal characteristic of the Platinum (Pt) micro-heater and the...journal article 2019
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Zhang, H. (author), Liu, Y. (author), Wang, Lingen (author), Sun, Fenglian (author), Fan, Xuejun (author), Zhang, Kouchi (author)The nanoindentation test was conducted in this paper to investigate the indentation hardness, plasticity and initial creep properties of pressure sintered nanosilver joint at various test temperatures. The effects of strain rate on the indentation hardness were first investigated. Then yield stress of nanosilver sintered joint was studied in...journal article 2019
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Chen, B. (author), Sun, Yubo (author), Jacquemin, Loic (author), Zhang, Shizhe (author), Blom, Kees (author), Lukovic, M. (author), Ye, G. (author)At present, most municipal solid waste incineration (MSWI) bottom ash, as being disposed of as waste, is directly landfilled, raising concern about the environmental issue and potential loss of resources. Given that the natural raw materials used for cement production are being depleted, the recycling of MSWI bottom ash for the application as...conference paper 2019
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Sun, J. (author), Zhan, Teng (author), Liu, Zewen (author), Wang, Junxi (author), Yi, Xiaoyan (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)This paper demonstrates a method to reduce the decay time in AlGaN/GaN photodetectors by a pulsed heating mode. A suspended AlGaN/GaN heterostructure photodetector integrated with a micro-heater is fabricated and characterized under ultraviolet illumination. We have observed that the course of persistent photoconductivity was effectively...journal article 2019
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Sun, Y. (author), Kang, Xuanwu (author), Zheng, Yingkui (author), Lu, Jiang (author), Tian, Xiaoli (author), Wei, Ke (author), Wu, Hao (author), Wang, Wenbo (author), Liu, Xinyu (author), Zhang, Kouchi (author)Gallium nitride (GaN)-based vertical power Schottky barrier diode (SBD) has demonstrated outstanding features in high-frequency and high-power applications. This paper reviews recent progress on GaN-based vertical power SBDs, including the following sections. First, the benchmark for GaN vertical SBDs with different substrates (Si, sapphire, and...review 2019
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Zhang, Youyou (author), Mosallam, Ayman (author), Liu, Yuqing (author), Sun, Yun (author), Xin, H. (author), He, Jun (author)In this study, flexural behaviors of the pultruded composite laminate were evaluated through experiments and theoretical analysis. Three-point flexural tests were performed for pultruded specimens. The typical failure mode for the longitudinal flexural specimens was local crush on the top surface accompanied with local cracks on the bottom...journal article 2019
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Yu, C. (author), Hageman, J.G. (author), Ganapathy, S. (author), van Eijck, L. (author), Zhang, Long (author), Adair, Keegan R. (author), Sun, Xueliang (author), Wagemaker, M. (author)The ultrafast ionic conductivity of Li <sub>6</sub> PS <sub>5</sub> Br, which is higher than 1 mS cm <sup>-1</sup> at room temperature, makes it an attractive candidate electrolyte for the all-solid-state Li-S battery. A simple synthesis route with an easy scale up process is critical for practical applications. In this work, the highest room...journal article 2019
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Sun, B. (author), Fan, J. (author), Fan, Xuejun (author), Zhang, Kouchi (author), Zhang, Guohao (author)In this paper, a physics of failure-based prediction method is combined with statistical models to consider the impact of current crowding and current droop effects on the reliability of LED arrays. Electronic-thermal models of LEDs are utilized to obtain the operation conditions under the influences of current crowding and current droop. A...journal article 2019
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Zhang, H. (author), Liu, Y. (author), Wang, Lingen (author), Sun, Fenglian (author), Fan, Jiajie (author), Placette, Mark D. (author), Fan, Xuejun (author), Zhang, Kouchi (author)Modern power electronics has the increased demands in current density and high-temperature reliability. However, these performance factors are limited due to the die attach materials used to affix power dies microchips to electric circuitry. Although several die attach materials and methods exist, nanosilver sintering technology has received...journal article 2019
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Liu, Y. (author), Zhang, H. (author), Wang, Lingen (author), Fan, Xuejun (author), Zhang, Kouchi (author), Sun, Fenglian (author)Purpose: Crack and stress distribution on dies are key issues for the pressure-assisted sintering bonding of power modules. The purpose of this research is to build a relationship among stress distributions, sintering sequences and sintering pressures during the sintering processes. Design/methodology/approach: Three sintering sequences, S(a)...journal article 2019
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Ge, W. (author), Jiao, Yutie (author), Sun, Heqiang (author), Li, Zongkun (author), Zhang, Hexiang (author), Zheng, Yan (author), Guo, Xinyan (author), Zhang, Zhaosheng (author), van Gelder, P.H.A.J.M. (author)Dam breach has catastrophic consequences for human lives and economy. In previous studies, empirical models are often, to a limited extent, due to the inadequacy of historical dam breach events. Physical models, which focus on simulating human behavior during floods, are not suitable for fast analysis of a large number of dams due to the...journal article 2019
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Sun, J. (author), Zhan, Teng (author), Liu, Zewen (author), Wang, Junxi (author), Yi, Xiaoyan (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A suspended WO<sub>3</sub>-gate AlGaN/GaN heterostructure photodetector integrated with a micro-heater is micro-fabricated and characterized for ultraviolet photo detection. The transient optical characteristics of the photodetector at different temperatures are studied. The 2DEG-based photodetector shows a recovery (170 s) time under 240 nm...journal article 2019
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Sun, J. (author), Sokolovskij, R. (author), Iervolino, E. (author), Santagata, F. (author), Liu, Zewen (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A suspended AlGaN/GaN high electron mobility transistor (HEMT) sensor with a tungsten trioxide (WO 3 ) nanofilm modified gate was microfabricated and characterized for ppm-level acetone gas detection. The sensor featured a suspended circular membrane structure and an integrated microheater to select the optimum working temperature. High working...journal article 2019
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Zhang, Hongyue (author), Sun, Y. (author)Annual cycles in the geocenter motion time series are primarily driven by mass changes in the Earth’s hydrologic system, which includes land hydrology, atmosphere, and oceans. Seasonal variations of the geocenter motion have been reliably determined according to Sun et al. (J Geophys Res Solid Earth 121(11):8352–8370, 2016) by combining the...journal article 2018
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Zhan, X. (author), Liu, Chuang (author), Zhou, Ge (author), Zhang, Zi-Ke (author), Sun, Gui-Quan (author), Zhu, Jonathan J. H. (author), Jin, Zhen (author)The interaction between disease and disease information on complex networks has facilitated an interdisciplinary research area. When a disease begins to spread in the population, the corresponding information would also be transmitted among individuals, which in turn influence the spreading pattern of the disease. In this paper, firstly, we...journal article 2018
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Liu, Yang (author), Zhang, H. (author), Wang, Lingen (author), Fan, Xuejun (author), Zhang, Kouchi (author), Sun, Fenglian (author)The microstructure, thickness, porosity, and shear performance of the silver (Ag) sintering layers under different sintering pressures were investigated. Experimental results demonstrated that the thickness and the porosity of the sintering layer decreased when the sintering pressure varied from 5 MPa to 30 MPa. This densification phenomenon...journal article 2018
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Zhang, H. (author), Liu, Yang (author), Wang, Lingen (author), Fan, Jiajie (author), Fan, Xuejun (author), Sun, Fenglian (author), Zhang, Kouchi (author)High reliable packaging materials are needed for electronics when they work at harsh environments. Among which, the nanosilver material has been widely studied and applied in power electronics due to its low processing temperature and high reliability. This paper investigates the bonding properties of nanosilver sintered hermetic cavity. There...journal article 2018
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Sun, Bo (author), Fan, Xuejun (author), van Driel, W.D. (author), Cui, Chengqiang (author), Zhang, Kouchi (author)In this study, we present a general methodology that combines the reliability theory with physics of failure for reliability prediction of an LED driver. More specifically, an integrated LED lamp, which includes an LED light source with statistical distribution of luminous flux, and a driver with a few critical components, is considered. The...journal article 2018