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Hydraulic fracturing pressure of concentric double-layered cylinder in cohesive soil
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 937-947 doi: 10.1007/s11709-021-0754-4
关键词: hydraulic fracturing pressure layered cavity expansion theory triaxial fracturing test cohesive soil
张梅,张民庆,朱鹏飞,黄鸿健
《中国工程科学》 2009年 第11卷 第12期 页码 13-19
高压富水充填溶腔具有水量大、水压高、规模范围大、充填介质复杂的特征,工程施工风险极高,采用传统的注浆法进行处理,受地层的不均一性、材料选择、技术水平的影响,难免会出现注浆盲区,施工中一旦注浆盲区被高压水击穿,将会发生大规模突水突泥,造成灾害。针对宜万铁路所遇到的高压富水充填溶腔,通过科技攻关,提出采取释能降压新技术进行处治。经现场实践,安全、经济、可靠,并取得了成功。释能降压技术是针对高压富水充填溶腔采取有计划、有目的的精确爆破揭示,从而释放溶腔所存储的能量,降低施工及运营过程中水土压力对隧道形成影响,之后,通过配套处治措施完成溶腔治理。
Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity
Zhaomiao LIU, Chengyin ZHANG, Feng SHEN
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 359-368 doi: 10.1007/s11465-011-0222-2
The flow, bearing, and carrying capacity of the cycloidal hydrostatic oil cavity in hydrostatic turntable systems are numerically simulated, considering the rotation speeds of a turntable from 0 to 5 m/s and different boundary conditions. The vortex effect is weakened, and the stability of the oil cavity is enhanced with the increase in lubricant viscosity. However, the increase in inlet speed, depth, and inlet radius of the oil cavity causes the vortex effect to increase and the stability of oil cavity to reduce. With the increase in the oil film thickness, the carrying capacity of the oil cavity diminishes. The oil cavity pressure increases along the direction of the motion of the turntable; it is distributed unevenly because of the rotation of the turntable. With the increase in turntable speed, the location and size of the vortex scope in the oil cavity flow field and the strength of the vortex near the entrance gradually weaken and move away from the entry. The distribution of pressure is determined by the locations of the vortex. When the vortex is close to the wall, the wall pressure increases at its location. Otherwise, the wall pressure decreases first and then increases after the center of the vortex.
关键词: hydrostatic oil cavity flow state oil cavity pressure stability vortex
Effects of critical geometric parameters on the optical performance of a conical cavity receiver
Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ
《能源前沿(英文)》 2019年 第13卷 第4期 页码 673-683 doi: 10.1007/s11708-019-0630-2
关键词: parabolic collector conical cavity receiver critical geometric parameters optical performance
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
《结构与土木工程前沿(英文)》 2022年 第16卷 第5期 页码 600-614 doi: 10.1007/s11709-022-0821-5
关键词: high-performance concrete cavity conventional triaxial compression pressurized liquid modified power-law criterion
Three-dimensional numerical simulation for plastic injection-compression molding
Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 74-84 doi: 10.1007/s11465-018-0490-1
Compared with conventional injection molding, injection-compression molding can mold optical parts with higher precision and lower flow residual stress. However, the melt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compression and the nonlinear problems caused by non-Newtonian polymer melt. In this study, a 3D simulation method was developed for injection-compression molding. In this method, arbitrary Lagrangian-Eulerian was introduced to model the moving-boundary flow problem in the compression stage. The non-Newtonian characteristics and compressibility of the polymer melt were considered. The melt flow and pressure distribution in the cavity were investigated by using the proposed simulation method and compared with those of injection molding. Results reveal that the fountain flow effect becomes significant when the cavity thickness increases during compression. The back flow also plays an important role in the flow pattern and redistribution of cavity pressure. The discrepancy in pressures at different points along the flow path is complicated rather than monotonically decreased in injection molding.
关键词: injection-compression molding simulation injection molding melt flow cavity pressure
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
《能源前沿(英文)》 2011年 第5卷 第1期 页码 98-103 doi: 10.1007/s11708-010-0019-8
关键词: solar cavity receiver Monte Carlo method heat flux distribution
―Summary of investigations on rotating cavity at IDG, RWTH Aachen University
Dieter BOHN, Jing REN,
《能源前沿(英文)》 2009年 第3卷 第4期 页码 489-497 doi: 10.1007/s11708-009-0040-y
Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO
《能源前沿(英文)》 2019年 第13卷 第2期 页码 284-295 doi: 10.1007/s11708-019-0613-3
关键词: cylindrical cavity receiver 3-D numerical simulation geometric optimization direct normal irradiation
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0676-4
关键词: additional position change deviation correction trajectory earth pressure balance shield mechanical model posture rectification
Yong SHUAI, Xinlin XIA, Heping TAN
《能源前沿(英文)》 2010年 第4卷 第4期 页码 488-495 doi: 10.1007/s11708-010-0007-z
关键词: Monte Carlo method solar energy radiation performance cavity receiver
Combustion instability detection using the wavelet detail of pressure fluctuations
JI Junjie, LUO Yonghao
《能源前沿(英文)》 2008年 第2卷 第1期 页码 116-120 doi: 10.1007/s11708-008-0019-0
关键词: comparison wavelet approximation pressure transducer general pressure consistent
“Partial pressures” of humid air in wide pressure and temperature ranges
Zidong WANG, Hanping CHEN, Shilie WENG
《能源前沿(英文)》 2013年 第7卷 第4期 页码 511-517 doi: 10.1007/s11708-013-0281-7
关键词: partial pressure Dalton’s partial pressure law humid air saturated unsaturated
Non-invasive continuous blood pressure monitoring: a review of current applications
null
《医学前沿(英文)》 2013年 第7卷 第1期 页码 91-101 doi: 10.1007/s11684-013-0239-5
Blood pressure monitoring has come a long way from the initial observations made by Reverend Hales in the 18th century. There are none that deny the importance of monitoring perioperative blood pressure; however, the limited ability of the current prevalent technology (oscillometric blood pressure monitoring) to offer continuous blood pressure measurements leaves room for improvement. Invasive monitoring is able to detect beat-to-beat blood pressure measurement, but the risks inherent to the procedure make it unsuitable for routine use except when this risk is outweighed by the benefits. This review focuses on the discoveries which have led up to the current blood pressure monitoring technologies, and especially the creation of those offering non-invasive but continuous blood pressure monitoring capabilities, including their methods of measurement and limitations.
关键词: non-invasive blood pressure monitoring continuous blood pressure monitoring invasive blood pressure monitoring Riva-Rocci technique oscillometric Pe?áz technique arterial tonometry pulse transit time
《结构与土木工程前沿(英文)》 2021年 第15卷 第6期 页码 1480-1493 doi: 10.1007/s11709-021-0776-y
关键词: seismic active earth pressure partial seepage flow pore pressure anisotropy upper bound theorem
标题 作者 时间 类型 操作
Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity
Zhaomiao LIU, Chengyin ZHANG, Feng SHEN
期刊论文
Effects of critical geometric parameters on the optical performance of a conical cavity receiver
Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ
期刊论文
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
期刊论文
Three-dimensional numerical simulation for plastic injection-compression molding
Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI
期刊论文
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
期刊论文
―Summary of investigations on rotating cavity at IDG, RWTH Aachen University
Dieter BOHN, Jing REN,
期刊论文
Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation
Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO
期刊论文
Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions
期刊论文
Numerical simulation and experiment research of radiation performance in a dish solar collector system
Yong SHUAI, Xinlin XIA, Heping TAN
期刊论文
Combustion instability detection using the wavelet detail of pressure fluctuations
JI Junjie, LUO Yonghao
期刊论文
“Partial pressures” of humid air in wide pressure and temperature ranges
Zidong WANG, Hanping CHEN, Shilie WENG
期刊论文