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Numerical analysis and field monitoring tests onshallow tunnels under weak surrounding rockLIU Jian-hua(刘建华)1, LIU Xiao-ming(刘晓明)2, ZHANG Yong-jie(张永杰)3, XIAO Ting(肖庭)1(1. School of Traffic... province, China and whose surrounding rock is weak. According to its characteristics, the field monitoring tests and numerical analysis were done. The mechanical characteristics of shallow tunnels......
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alloy prepared by weak electromagnetic stirring[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(1): 71-76. [14] BAI Yue-long, XU Jun, ZHANG Zhi-feng, SHI Li-kai. Preparation of semi... frequency on the microstructural evolution of semisolid 2A50 alloy prepared by electromagnetic stirring (EMS) were analyzed, and microstructure evolution of semisolid 2A50 alloy prepared by different......
J. Cent. South Univ. (2019) 26: 3087-3102 DOI: https://doi.org/10.1007/s11771-019-4238-9 Flexural and eigen-buckling analysis of steel-concrete partially composite plates using weak form quadrature... under simply supported and clamped boundary conditions are conducted using the weak form quadrature element method (QEM). Both of the derivatives and integrals in the variational description......
mechanism for non dendritic structure in semi solid metal is proposed, namely mechanism of particle drift and blending compressing. Under vigorous convection caused by intense electromagnetic stirring... processing; non dendritic structure; electromagnetic stirring; Received: 1999-09-20 对于常规铸造形成的组织结构, 经典铸造理论一般从热力学角度按"三个晶区"进行解释, 但这种解释存在许多与实验或生产实际不相符合的地方, 例如对于内部等轴晶区形成的解释......
, and RE elements La and Ce can effectively refine the primary α phase under the condition of short and weak electromagnetic stirring. The refining mechanism of RE on the primary α phase in semisolid A356...): 277-284. [13] LIU Zheng, MAO Wei-min, ZHAO Zhen-duo. Effect of pouring temperature on semi-solid slurry of A356 Al alloy prepared by weak electromagnetic stirring[J]. Transactions of Nonferrous Metals......
that the stirring intensity of austenitic stainless steel should be higher compared with that of plain carbon steel. Electromagnetic stirring affects the macrostructure even if the average magnetic flux density of the electromagnetic stirring reaches 90 mT (amplitude reaches 141 mT) with the frequency of 3-4 Hz. Due to a higher viscosity, rotating speed of molten stainless steel is 20%-30% lower than......
; 文献标志码:A 文章编号:1672-7207(2017)03-0721-08 Weak signal detection system based on Duffing oscillator with linear driven by to-be-detected... that the weak signal detection methods based on Duffing oscillator with periodic driving force signal have the defects that the detection accuracy can be affected by the critical threshold......
with electromagnetic stirring method (EMS DC method) . The effects of EMS DC method technical parameters on the structure of semi solid ZL101A alloy were investigated, and the relationship between the casting... as reported. Keyword: semi solid; electromagnetic stirring; direct chill cast; Received: 2000-03-08 半固态成形 (SSF) 技术是一种介于固态成形与液态成形之间, 融合了铸造和锻造工艺特点的新型金属成形技术......
J. Cent. South Univ. Technol. (2009) 16: 0569-0574 DOI: 10.1007/s11771-009-0095-2 Adsorption of Pb2+ on macroporous weak acid adsorbent resin from aqueous solutions: Batch and column studies...; Abstract: The adsorption properties of a novel macroporous weak acid resin......
