Search Results - "Ren, Zhengyi"

Experimental and numerical investigation on I–II mixed-mode fracture of concrete based on the Monte Carlo random aggregate distribution by Li, Guodong, Yu, Jiangjiang, Cao, Peng, Ren, Zhengyi

“…•Experiment and heterogeneous simulation are combined to study concrete I–II mixed-mode fracture.•Effects of volume fraction & SSA of coarse aggregate on I–II…”
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Application of Steel Slag as an Aggregate in Concrete Production: A Review by Ren, Zhengyi, Li, Dongsheng

“…Steel slag is a solid waste produced in crude steel smelting, and a typical management option is stockpiling in slag disposal yards. Over the years, the…”
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On the Westward Shift and Strengthening of the Atmosphere‐To‐Ocean Bjerknes Feedback in the Tropical Pacific Since 2000 by Li, Zongrong, Ding, Ruiqiang, Mao, Jiangyu, Ren, Zhengyi, Li, Jianping

“…The behavior of the El Niño–Southern Oscillation (ENSO) has undergone significant changes since the year 2000. Meanwhile, a notable westward shift and…”
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Mixed-Mode I-II Fracture Process Zone Characteristic of the Four-Point Shearing Concrete Beam by Li, Guodong, Ren, Zhengyi, Yu, Jiangjiang

“…The size of the fracture process zone (FPZ) has significance for studying the fracture mechanism and fracture characteristics of concrete. This paper presents…”
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Damage Evaluation of Concrete under Uniaxial Compression Based on the Stress Dependence of AE Elastic Wave Velocity Combined with DIC Technology by Li, Guodong, Gu, Jiarui, Ren, Zhengyi, Zhao, Fengnian, Zhang, Yongquan

“…This study presented evaluation of a concrete damage process by the acoustic emission (AE) technique under uniaxial multi-step compressive loading procedure…”
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Mixed-mode I-II mesoscale fracture behavior of concrete determined by the realistic aggregate numerical model by Jiangjiang, Yu, Guodong, Li, Zhengyi, Ren, Wei, Zhang, Jiangqi, Tang, Li, Zhang, Xiaolong, Si, Zhimeng, Zhao

“…•The meso-numerical model, corresponding to the realistic aggregate distribution, was established.•The spatial distribution of the coarse aggregate determines…”
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Simulated and developed an electron impact ionization source for space miniature time-of-flight mass spectrometer by Ren, Zhengyi, Guo, Meiru, Cheng, Yongjun, Sun, Wenjun, Dong, Meng, Li, Gang, Pei, Xiaoqiang, Wu, Chengyao

“…Based on the ions initial distribution and electrodes parameters of electron impact (EI) ionization source, the physical model of miniature EI source is…”
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Vacuum measurement of He based on Fabry-Perot cavity and constant pressure reference by Jia, Wenjie, Xi, Zhenhua, Guo, Meiru, Fan, Dong, Ren, Zhengyi, Cheng, Yongjun

“…In order to reduce the uncertainty of the gas refractive index measurement device based on laser interferometry. A measuring method based on constant pressure…”
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Mixed Mode I-II Fracture Path and Initiation Angle of Concrete at Mesoscale Level by Yu, Jiangjiang, Wang, Zhiyuan, Ren, Zhengyi, Li, Guodong, Zhao, Zhimeng

“…This paper presents the mesolevel numerical simulation and experimental verification of mixed mode I-II fracture for the four-point shearing beam with a…”
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Uniaxial compressive behavior study of normal-strength concrete using waste steel slag aggregate through laboratory tests and numerical simulation by Ren, Zhengyi, Li, Dongsheng

“…Steel slag aggregate concrete (SSAC) is a potentially sustainable construction material. But at present, the lack of a uniaxial compression stress-strain model…”
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Spinning Deformation Criteria of Thin-walled Tubular Part with Longitudinal Inner Ribs by Shuyong, Jiang, Kemin, Xue, Chunfeng, Li, Zhengyi, Ren

“…As a successive and local plastic deformation process, backward ball spinning was applied for the purpose of prodacing thin-walled tubular parts with…”
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Review and prospect on portable mass spectrometer for recent applications by Yang, Zhe, Ren, Zhengyi, Cheng, Yongjun, Sun, Wenjun, Xi, Zhenghua, Jia, Wenjie, Li, Gang, Wang, Yongjun, Guo, Meiru, Li, Detian

“…With the rapid growth of science and technology, portable mass spectrometers have become an essential part of analytical instruments for research. In view of…”
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Study on the provision of traceable flow rate of water vapor for calibrating a time-of-flight mass spectrometer by Geng, Jian, Wang, Xiaodong, Tao, Wenze, Xi, Zhenhua, Zhang, Hai, Li, Lishan, Ren, Zhengyi, Guo, Meiru

“…•A new method called pΔt method was given to measure the conductance of water vapor through an orifice.•The VΔp method and the pΔt method were compared in…”
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A review of the development and application of space miniature mass spectrometers by Ren, Zhengyi, Guo, Meiru, Cheng, Yongjun, Wang, Yongjun, Sun, Wenjun, Zhang, Huzhong, Dong, Meng, Li, Gang

“…This article reviews the recent development and application of four types of space miniature mass spectrometers including magnetic sector mass spectrometer,…”
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Performance evaluation of a miniature LWMA MS designed for in situ lunar investigations by Ren, Zhengyi, Han, Xiaodong, Geng, Jian, Yang, Zhe, Sun, Jian, Li, Gang, Wang, Runfu, Guo, Meiru

“…There is still no direct evidence for the existence of water ice and organic matter on the moon. The main goal of developing a miniature time-of-flight mass…”
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A novel mobile navigation monitoring system based on single photon ionization time-of-flight mass spectrometry: Instrumentation development, performance and application by Ren, Zhengyi, Niu, Hongzhi, Han, Xiaodong, Yang, Zhe, Sun, Jian, Guo, Meiru, Tan, Guobin, Li, Gang

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Miniaturized time-of-flight mass spectrometer for lunar water detection by Sun, Jian, Niu, Hongzhi, Tan, Guobin, Guo, Meiru, Ren, Zhengyi, Li, Gang, Zhang, Jianfeng, Huang, Zhengxu, Zhou, Zhen

“…A Time-of-Flight mass spectrometer (TOF-MS) for lunar water detection is developed concerning miniaturization design. A compact closed ion source is adopted,…”
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Development of a newly compact double-focusing mass spectrometer by Yang, Zhe, Li, Detian, Ren, Zhengyi, Geng, Jian, Sun, Jian, Wang, Xuezhi, Li, Gang, Cheng, Yongjun, Zhang, Hong, Guo, Meiru

“…In recent years, mass spectrometers play an important role in space missions. Based on this, we introduced a newly developed compact double-focusing mass…”
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Research on a miniature Mattauch-Herzog mass spectrometer designed for space exploration by Yang, Zhe, Li, Detian, Ren, Zhengyi, Sun, Jian, Zhang, Huzhong, Cheng, Lian, Wang, Pengwei, Li, Gang, Cheng, Yongjun, Guo, Yonggang, Xu, Hengtong, Guo, Meiru

“…Mass spectrometers have gained increasing importance in recent space missions. This paper presents the development of a miniature Mattauch-Herzog mass…”
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Research on measuring method of pumping speed for miniature sputter ion pump by Geng, Jian, Wang, Xiaodong, Guo, Meiru, Zhang, Shiwei, Cheng, Yongjun, Li, Yongchun, Li, Haitao, Ren, Zhengyi

“…•In this work, a new calibration apparatus has been developed to get the low pumping speed of the miniature sputter ion pump.•The flowmeter method and the…”
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