oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 203 )

2018 ( 2222 )

2017 ( 2109 )

2016 ( 2090 )

Custom range...

Search Results: 1 - 10 of 126956 matches for " LI Shuchen "
All listed articles are free for downloading (OA Articles)
Page 1 /126956
Display every page Item
N-(2,3,4-Trifluorophenyl)morpholine-4-carboxamide
Li Jie,Pei Shuchen,Hai Li,Wu Yong
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811051300
Abstract: In title molecule, C11H11F3N2O2, the central –N—C(=O)—N– unit is essentially planar [maximum deviation = 0.013 (2) ] and forms a dihedral angle of 57.33 (9)° with the benzene ring. The morpholine ring is in a chair conformation. In the crystal, molecules are linked into chains along [001] by N—H...O hydrogen bonds.
N-(2,3,4-Trifluorophenyl)pyrrolidine-1-carboxamide
Shuchen Pei,Jie Li,Boyi Qu,Li Hai
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811051385
Abstract: In the title compound, C11H11F3N2O, a urea derivative, the best plane through the pyrrole ring makes a dihedral angle of 9.69 (13)° with the benzene ring. The amino H atom is shielded, so that it is not involved in any hydrogen-bonding interactions.
A REVIEW OF RESEARCH ON ZONAL DISINTEGRATION PHENOMENON IN DEEP ROCK MASS ENGINEERING
深部岩体工程围岩分区破裂化现象研究综述

QIAN Qihu,LI Shuchen,
钱七虎
,李树忱

岩石力学与工程学报 , 2008,
Abstract: 随着经济建设与国防建设的不断发展,深部岩体工程越来越多,如逾千米乃至数千米的矿山(如金川镍矿和南非金矿等)、锦屏二级引水隧洞及辅助洞、核废料的深层地下存储、深部地下防护工程等.深部岩体工程在开挖洞室或巷道时,围岩变形和破坏等出现了一系列新的科学现象.除了岩爆和围岩挤压大变形以外,围岩的分区破裂化现象也吸引了很多岩石力学工作者的关注.基于国外对分区破裂化现象的实验和理论研究,归纳出分区破裂化现象的主要特征参数及其变化规律,揭示分区破裂化现象产生的条件;提出这一领域的研究方向;同时介绍国内在该领域实验和理论方面的研究进展.
3D GEOSTRESS REGRESSION ANALYSIS METHOD AND ITS APPLICATION
三维地应力回归分析方法与工程应用

Qiu Xiangbo,Li Shucai,Li Shuchen,
邱祥波
,李术才,李树忱

岩石力学与工程学报 , 2003,
Abstract: Initial geostress is one of the most important factors in geotechnical design and construction. According to in situ measurement,with 3D FEM regression analysis used,considering the gravity and con- structional stresses of rock mass,and by using multivariate regression analysis principle,the initial stress field of the calculation area can be obtained. The geostress regression analysis results of a highway tunnel indicate that the calculated results are in a good agreement with the in situ measured data and can be used to engineering practice.
STUDY ON FERMENTATION OF 1,13-TRIDECANEDIOIC ACID BY CANDIDA TROPICALIS
十三碳二元羧酸发酵技术的研究

Liu Shuchen,Li Shulan,Fang Xiangchen,
刘树臣
,李淑兰,方向晨

微生物学报 , 2000,
Abstract: A mutant of Candida tropicalis SP-1, SP-UV-56, which can produce 1,13-tride-canedioic acid or 1, 11-dicarboxylic acid (DCA13) 1.25 times as much as its parental strain SP-1, but hardly assimilates nalkane as carbon source for its growth, was obtained by ultraviolet treatments. A fermentation technology with a supplement of acetate at the latter middle of logarithmic growth was developed. Using sucrose as carbon source for its growth and supplying acetate the yield of DCA13 reached 153g/L for 144h incubation in a 13.7L autocontrolled stirred tank, about 29.7 % higher than that obtained in the broth without acetate.An effective technique that can maintain higher yield was provided by enhancing mixing of broth and controlling low DO level. With these techniques the DCA13 yield reached 172g/L in a 20m3 stirred tank, and produced 2.25 tons DCA13 in 15.0m3 broth.
MULTICOMPONENT SEGREGATION ALONG BOUNDARY AND THERMODYNAMICAL ANALYSIS OF Fe-C-Si-Mn ALLOY
Fe—C—Si—Mn晶界多元偏聚研究与热力学分析

LI Shuchen,LIU Shikai Southwestern Jiaotong University,Chengdu,
李树尘
,刘世楷

金属学报 , 1991,
Abstract: 采用Auger谱仪、二次离子质谱仪(SIMS)对Fe-C-Si-Mn合金(475℃等温处理)原始奥氏体晶界C,Si,Mn元素偏聚进行了研究。根据C,Mn正偏聚,Si负偏聚的实验结果,对晶界碳偏聚偏克分子自由能及活度进行热力学计算,结果表明Si,Mn元素促进碳在晶界的偏聚,并降低了它在晶界上的活度。从而使Fe-C-Si-Mn合金上贝氏体等温C曲线右移的现象得到解释。
Development of a Quasi-Periodic Undulator for the HLS
Yufeng Yang,Huihua Lu,Wan Chen,Qika Jia,Shuchen Sun,Zhiqiang Li
Physics , 2014, DOI: 10.1088/1674-1137/38/7/077002
Abstract: China's first quasi-periodic undulator (QPU) has been developed for the Hefei Light Source (HLS). It uses a magnetic configuration with varied thicknesses of NdFeB blocks, based on the QPU of European Synchrotron Radiation Facility (ESRF). Depression of 3rd harmonic radiation is significantly improved over the ESRF QPU, as deduced from the measured magnetic fields. A method of configuring shims of different geometries and sizes, based on a symmetric principle to correct multi-pole field integrals, was demonstrated.
Development of A Modified Quasi-periodic Undulator for HLS
Yufeng Yang,Huihua Lu,Wan chen,Qika Jia,Shuchen Sun,Zhiqiang Li
Physics , 2013,
Abstract: A modified quasi periodic undulator (QPU) is developed and to be installed at Hefei Light Source (HLS).Magnet dimensions optimization is applied. High harmonics contamination is eliminated from the fundamental emission effectively according to the field tests. The depression ratio of 3rd harmonic is increased by an order of magnitude than the current device with other harmonics well reduced simultaneously. The significance of the modification measure is verified practically. The design, measurement and commissioning of the device is described.
APPLICATION OF ELECTRICAL RESISTIVITY TOMOGRAPHY MONITORING SYSTEM TO MINE WATER INRUSH MODEL TEST
电阻率层析成像法监测系统在矿井突水模型试验中的应用

LIU Bin,LI Shucai,LI Shuchen,LI Liping,
刘斌
,李术才,李树忱,李利平

岩石力学与工程学报 , 2010,
Abstract: 为实现矿井突水过程中岩层断裂和渗流通道形成过程的实时监测和前兆信息捕捉,将三维电阻率层析成像法作为一种实时成像监测手段尝试引入到矿井突水模型试验的监测工作中。采用具有自动采集功能的电阻率层析成像监测系统,实现介质电阻率变化数据的实时动态监测。提出优化反演效率的计算方法,利用Cholesky分解法求解电阻率层析成像正演中的大型线性方程组,利用预条件共轭梯度法求解反演方程,由此建立三维电阻率层析成像实时反演方法,实现原始数据的快速反演和动态图像的实时输出。提出以电阻率层析成像法为主,结合原始视电阻率数据分析和关键点数据时程曲线分析的多参数监测分析方法。在试验过程中,利用层析成像法得到防突层裂隙产生、扩展直至贯通的实时动态图像,得到主要裂隙和渗流通道的产生位置、形成过程等信息,与实际情况基本一致。综合3种方法的分析结果,得出防突层发生突水断裂的诱因,并确定捉到确切前兆信息的最早时,该时刻比突水发生时刻提前998 s。模型试验证明,电阻率层析成像系统有效地反映岩层断裂及渗流通道的形成过程,成功地捕捉到一系列前兆信息,为突水灾害的及时预警预报提供重要参考。
COUPLING MESHLESS METHOD AND FINITE ELEMENT METHOD FOR SEEPAGE OF JOINTED ROCK MASS
节理岩体渗流的无网格与有限元耦合方法

LI Shuchen,LI Shucai,SUI Bin,ZHU Weishen,
李树忱
,李术才,隋 斌,朱维申

岩石力学与工程学报 , 2007,
Abstract: The seepage analysis is important to many engineerings including seepage failure of the jointed rock mass,petrolic seepage in the jointed rock mass and waterproof design of the underground engineering.The analytical method can be restricted by some practice factors such as the non-homogenous and anisotropy of the seepage medium for the jointed rock mass,uncertain initial conditions,the boundary condition and the complex geometrical shape etc.The coupling meshless method and finite element method for the seepage of the jointed rockmass are developed in the paper.The seepage problems of the jointed rock mass are mainly solved by the meshless method.The discrete equations and relational computation formula of the method are derived by the variational principle.The boundary conditions are considered by the coupling method.At last,the validity and accuracy of the present coupling method solution are illustrated by two numerical examples.
Page 1 /126956
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.