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377 results on '"Zheng, Hongchao"'

6. Aerospace Microelectronics

Author

Zhao, Yuanfu, Yue, Suge, Zheng, Hongchao, Wang, Liang, Wang, Yangyuan, editor, Chi, Min-Hwa, editor, Lou, Jesse Jen-Chung, editor, and Chen, Chun-Zhang, editor

Published
2024
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13. GTF2H4 regulates partial EndMT via NF-κB activation through NCOA3 phosphorylation in ischemic diseases

Author

Fang, Zheyan, Zhao, Gang, Zhao, Shuang, Yu, Xueting, Feng, Runyang, Zhang, You-en, Li, Haomin, Huang, Lei, Guo, Zhenyang, Zhang, Zhentao, Abdurahman, Mukaddas, Hong, Hangnan, Li, Peng, Wu, Bing, Zhu, Jinhang, Zhong, Xin, Huang, Dong, Lu, Hao, Zhao, Xin, Chen, Zhaoyang, Zhang, Wenbin, Guo, Junjie, Zheng, Hongchao, He, Yue, Qin, Shengying, Lu, Haojie, Zhao, Yun, Wang, Xiangdong, Ge, Junbo, and Li, Hua

Published
2024
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21. Impact of different parameters on the static random access memory under the total ionizing dose

Author

ZHANG Fuqiang, CHEN Qiming, GONG Yihao, XIAO Shuyan, ZHANG Zheng, MA Xu, ZHAO Shuyong, ZHENG Hongchao, ZHANG Jianpeng, and GUO Gang

Subjects
static random access memory, total dose effect, power supply current, feature size, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798, Medical physics. Medical radiology. Nuclear medicine, R895-920
Abstract

The effect of the total ionizing dose (TID) on the static random access memory (SRAM) is conducted on the 60Co radioactive source in the China Institute of Atomic Energy. The study explores the influence of the device process size, dose rate, temperature and total dose on TID. The results indicated that within a certain range, the dose rate had little influence on the TID of the device. The larger the characteristic size of the device, the greater TID effect, while the higher temperature, the weaker the total dose effect. In addition, the typical dose rate and the uniformity of the source are achieved. The research of the paper provide an insight into radiation hardening, particularly in the aerospace and the nuclear industries.

Published
2023
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28. Discovery of Novel Macrocyclic MERTK/AXL Dual Inhibitors

Author

Kong, Deyu, primary, Tian, Qiang, additional, Chen, Zhilong, additional, Zheng, Hongchao, additional, Stashko, Michael A., additional, Yan, Dan, additional, Earp, H. Shelton, additional, Frye, Stephen V., additional, DeRyckere, Deborah, additional, Kireev, Dmitri, additional, Graham, Douglas K., additional, and Wang, Xiaodong, additional

Published
2024
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32. Development and application of a radiation effect evaluation method of aerospace integrated circuits for radiation hardened by design

Author

ZHENG Hongchao, WANG Liang, LI Zhe, GUO Gang, and ZHAO Yuanfu

Subjects
aerospace integrated circuit, single-event effect, radiation hardened by design, radiation test, Nuclear engineering. Atomic power, TK9001-9401
Abstract

Aerospace integrated circuits represent core components of space electronic systems, and anti-radiation hardening is a key technology to ensure the reliable operation of aerospace integrated circuits in the space domain. As the feature sizes of integrated circuits shrink to the nanometer scale, the single-event effect gradually becomes the most critical factor limiting the radiation-hardened performance level of aerospace integrated circuits. In this study, radiation hardened by design is utilized as a method to develop radiation-hardened performance. Based on single-event radiation tests on a heavy ion accelerator, new methods are proposed for the single-event test evaluation of new processes and devices. Consequently, new technique development and radiation effect law research are also undertaken. The effectiveness of the design hardening technology is evaluated, and a single-event radiation damage mechanism is discovered. The proposed technology provides key support for the production of high-reliability and long-lifetime aerospace integrated circuit products.

Published
2023
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34. Deciphering Controls of Pore-Pressure Evolution on Sediment Bed Erosion by Debris Flows

Author

Zheng, Hongchao, Hu, Xinli, Shi, Zhenming, Shen, Danyi, De Haas, Tjalling, Zheng, Hongchao, Hu, Xinli, Shi, Zhenming, Shen, Danyi, and De Haas, Tjalling

Abstract

Pore-fluid pressure (PP) plays an important role in bed erosion, but the mechanisms that control PP evolution and the resulting feedbacks on flow dynamics are unclear. Here, we develop a general formulation, allowing quantification of the propensity for PP evolution of saturated and unsaturated bed sediments. We conduct erosion experiments by systematically varying grain composition and water content of beds, for investigating effects of PP evolution on flow erosion. With increasing water content, PP shows a slight rise in deforming beds with drained behavior but significant larger rise in undrained beds. Regardless of bed composition, the erosion rate of beds presents a synchronous change tendency with PP evolution due to the loss in basal friction. PP instigates positive feedback that induces a remarkable gain of flow velocity and momentum on wet beds with undrained behavior. Our results help explain observations of volume growth and long run out of debris flows.

Published
2024

35. Deciphering Controls of Pore-Pressure Evolution on Sediment Bed Erosion by Debris Flows

Author

Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Zheng, Hongchao, Hu, Xinli, Shi, Zhenming, Shen, Danyi, De Haas, Tjalling, Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Zheng, Hongchao, Hu, Xinli, Shi, Zhenming, Shen, Danyi, and De Haas, Tjalling

Published
2024

48. Characteristics of the Impact Pressure of Debris Flows

Author

Zheng, Hongchao, Shi, Zhenming, de Haas, Tjalling, Shen, Danyi, Hanley, Kevin J., Li, Bo, Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Landdegradatie en aardobservatie, and Landscape functioning, Geocomputation and Hydrology

Subjects
Physics::Fluid Dynamics, Impact pressure, Geophysics, Earth-Surface Processes, Debris flows, Grain segregation
Abstract

Debris flows are common geological hazards in mountainous regions worldwide. Predicting the impact pressure of debris flows is of major importance for hazard mitigation. Here, we experimentally investigate the impact characteristics of debris flows by varying the concentrations of debris grains and slurry. The measured impact pressure signal is decomposed into a stationary mean pressure (SMP) and a fluctuating pressure (FP) through empirical mode decomposition. The SMP of low frequency is caused by the thrusting of bulk flow while the FP of high frequency is induced by the collision of coarse debris grains, revealed by comparing the features of impact pressure spectra of pure slurries and debris flows. The peak SMP and the peak FP first increase and then decrease with the slurry density. The basal frictional resistance is reduced by the nonequilibrium pore-fluid pressure for debris flows with low-density slurry, which can increase the flow velocity and impact pressures. In contrast, the viscous flow of high-density slurry tends to reduce the flow velocity. The peak SMPs are well predicted by the Bernoulli equation and are related to the hydrostatic pressure and Froude number of the incident flow. The peak FPs depend on the kinetic energy and degree of segregation of coarse grains. The maximum degree of segregation occurs at an intermediate value of slurry density due to the transition of flow regime and fluid drag stresses. Our results facilitate predicting the impact pressures of debris flows based on their physical properties.

Published
2022
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49. Quantitative risk assessment of two successive landslide dams in 2018 in the Jinsha River, China

Author

UCL - SST/IMMC/GCE - Civil and environmental engineering, Yang, Jiangtao, Shi, Zhenming, Peng, Ming, Zheng, Hongchao, Soares Frazao, Sandra, Zhou, Jiawen, Shen, Danyi, Zhang, Limin, UCL - SST/IMMC/GCE - Civil and environmental engineering, Yang, Jiangtao, Shi, Zhenming, Peng, Ming, Zheng, Hongchao, Soares Frazao, Sandra, Zhou, Jiawen, Shen, Danyi, and Zhang, Limin

Abstract

Two large successive co-site landslide dams blocked the Jinsha River in the Sichuan Province of China in 2018. A quantitative risk analysis was carried out to quantify potential human and economic losses resulting from the failure of these dams, especially the interaction between the co-site landslide dams, and to further investigate the influence of digging a diversion channel on risk mitigation to better evacuate upstream waters. Flood routing for three scenarios (i.e. after the first dam formation, when the second landslide mass was added, and with a diversion channel after failures) were simulated using HEC-RAS. The human and economic losses were evaluated using a human risk assessment model together with empirical formulations. The results show that the risk of breaching floods had increased significantly after the second co-site landslide dam formation on the pre-existing loose deposits of the first dam. This amplification effect of outburst floods was so great that the peak outflow resulting from the breaching of the second landslide dams was more important, leading to greater economic losses than those resulting from the breaching of the first dam. However, the expected loss of life caused by the breach of the two landslide dams appeared small because of the sufficient time lag provided by the long distance between the residential area and the dam site. The simulations also outline the importance of the diversion channel in decreasing the peak outflow rate and hence downstream risks. A parametric analysis shows that a deep channel with a moderate longitudinal gradient can significantly decrease the peak outflow discharge at the dam site. Flood intensity and risks to downstream towns did not change because of the relatively small attenuation rate of the peak outflow rate. However, a shorter height of the residual dam can be obtained by optimizing the diversion channel, and the amplification effects of such co-site dam can be significantly reduced in the futur

Published
2022

50. Characteristics of the Impact Pressure of Debris Flows

Author

Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Zheng, Hongchao, Shi, Zhenming, de Haas, Tjalling, Shen, Danyi, Hanley, Kevin J., Li, Bo, Landdegradatie en aardobservatie, Landscape functioning, Geocomputation and Hydrology, Zheng, Hongchao, Shi, Zhenming, de Haas, Tjalling, Shen, Danyi, Hanley, Kevin J., and Li, Bo

Published
2022

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