检索结果-南通市图书馆

Preparation of Dy-Fe Alloy from Dy2O3 Bymolten Salt Electrochemical Process

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第Z1期22卷 332-334页

作者： Lin Jirong Han fujun zhao Liangzhong Zhang Xiuyan zhao Fei Research Institute for Rare Earth Application Technological Baotou 014010 China Research Institute for Rare Earth Application Technological Baotou 014010 China Baotou Huali Rare Earth Co. Ltd.Baotou 014030 China Research Institute for Rare Earth Application Technological Baotou 014010 China Research Institute for Rare Earth Application Technological Baotou 014010 China

Dy-Fe alloy replace dysprosium in the NdFeB permanent material can improve the performance and productivity and cut the *** electrolyte is a binary system of molten *** is cathode and graphite is *** raw material is Dy2O3 *** content of dysprosium is (78 ～85 ) ± 1% in the Dy-Fe alloy made by electrolyzing in the industry *** the course of electrolyzing the efficiency of current, the alloy formation and the productivity of rare earths by studying the formation of electrolyte, the electrolyzing temperature, the standards and the current density of cathode, the anode shape etc were *** conclusion is that we can produce Dy-Fe alloy (the content of dysprosium is (78 ～ 85 ) ± 1% ) in this condition, the efficiency of current is greater than 68 %, and the productivity of rare earth is greater than 92%.The content of oxygen, calcium, wolfram is smaller than the content by reducing.

关键词： electrolyze Dy-Fe alloys experiment rate earths

Protective effects of (-)-epigallocatechin-3-gallate on D-galactose-induced neuronal apoptosis in mice

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2009年第12期4卷 1024-1029页

作者： Miao He Lin zhao Weifan Yao Haishan zhao fujun Chen Minjie Wei Department of Pharmacology Pharmaceutical College of China Medical University Shenyang 110001 Liaoning Province China

BACKGROUND： The neuroprotective effects of （-）-epigallocatechin-3-gallate （EGCG）, the main polyphenolic constituent of green tea, have been widely reported. However, the action mechanisms, in particular in D-galactose-induced aging mice, remain poorly understood. OBJECTIVE： The present study investigated the protective effects of EGCG on D-galactose-induced hippocampus neuronal apoptosis in aging mice, as well as the relationship with expression of p751CD, JNK2, and p53 proteins. DESIGN, TIME AND SETTING： A randomized, controlled, molecular biological, animal experiment was performed at the Laboratory of Pharmacology, Pharmaceutical College of China Medical University, China, from September 2006 to July 2008. MATERIALS： D-galactose and EGCG （Sigma, USA）, as well as terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling （TUNEL） In Situ Cell Apoptosis Detection Kit （Promega, USA）, were used in this study. METHODS： A total of 64 mice were equally and randomly divided into D-galactose model, low-dose EGCG, high-dose EGCG, and control groups. Mice in the D-galactose model, low-dose EGCG, and high-dose EGCG groups were subcutaneously injected with 3% D-galactose （150 mg/kg）, daily for 6 weeks, to establish a mouse model of aging. Mice in the control group were treated with saline （5 mL/kg）. At 3 weeks following injection, mice in the low-dose EGCG and high-dose EGCG groups were orally administered EGCG at a dose of 2 mg/kg and 6 mg/kg, respectively, once a day, for 4 consecutive days. Mice in the control and D-galactose model groups received distilled water （5 mL/kg）. MAIN OUTCOME MEASURES： Memory function was evaluated using a step-through passive avoidance test. Neuronal apoptosis in the mouse hippocampus was detected using TUNEL staining. Expression levels of the intracellular domain of the p75 neurotrophin receptor （p75NTR）-p751CD, JNK2, and p53 proteins in the hippocampus were determined using Western blot analysis. RESULTS： The aging mouse mode

关键词： (-)-epigallocatechin-3-gallate D-galactose neuronal apoptosis aging

Non-linear Torsional Vibration Characteristics of an Internal Combustion Engine Crankshaft Assembly

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第4期25卷 797-808页

作者： HUANG Ying YANG Shouping ZHANG fujun zhao Changlu LING Qiang WANG Haiyan School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081 China

Crankshaft assembly failure is one of the main factors that affects the reliability and service life of *** linear lumped mass method,which has been universally applied to the dynamic modeling of engine crankshaft assembly,reveals obvious simulation *** nonlinear dynamic characteristics of a crankshaft assembly are instructionally significant to the improvement of modeling *** this paper,a general expression for the non-constant inertia of a crankshaft assembly is derived based on the instantaneous kinetic energy equivalence *** nonlinear dynamic equations of a multi-cylinder crankshaft assembly are established using the Lagrange rule considering nonlinear factors such as the non-constant inertia of reciprocating components and the structural damping of shaft *** natural frequency and mode shapes of a crankshaft assembly are investigated employing the eigenvector *** forced vibration response of a diesel engine crankshaft assembly taking into account the non-constant inertia is studied using the numerical integral *** simulation results are compared with a lumped mass model and a detailed model using the system matrix *** of non-linear torsional vibration analysis indicate that the additional excitation torque created by non-constant inertia activates the 2nd order rolling vibration,and the additional damping torque resulting from the non-constant inertia is the main nonlinear *** increased torsional angular displacement evoked by the high order excitation torque relates to the non-constant *** research project is aimed at improving nonlinear dynamics theory,and the confirmed nonlinear parameters can be used for the structure design of a crankshaft assembly.

关键词： internal combustion engine,crankshaft assembly,non-constant inertia,nonlinear vibration torsional vibration characteristics

Fault-alarm-threshold optimization method based on interval evidence reasoning

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第8期62卷 201-203页

作者： Zhijie ZHOU Taoyuan LIU Guanyu HU Wei HE fujun zhao Gailing LI Rocket Force University of Engineering College of Information Science and Technology Hainan Normal University School of Computer Science and Technology Harbin University of Science and Technology

Dear editor,Fault alarm threshold is an important parameter of a system used to monitor the condition of industrial equipment. Therefore, reasonably setting the fault alarm threshold and reducing both false negative and positive rate (FNPR) are vital for improving the efficiency of industrial operations and ensuring the safety and reliable operation of

关键词： Fault-alarm-threshold optimization method based on interval evidence reasoning

A New Genetic Algorithm for Web-based Negotiation Support System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A New Genetic Algorithm for Web-based Negotiation Support Sy...

Numerical experiment rock fragmentation by combined dynamic and static loads under dual-cutter head

2003 International Conference on Natural Language Processing and Knowledge Engineering

作者： Zhou Zhi Ji Jun zhao fujun Deng Qiangang Computer School Wuhan University Administration Department of Graduate the Airforce Logistics college the 3rd Departmentthe Airforce Logistics college

ISBN: (纸本)0780379020

＜正＞Web-based negotiation support system not only should provide the convenience for communication, but also give efficient solution in reasonable time to eliminate conflict and improve the success probability of the ***,in this paper, we construct a multi object combination optimization model that can be handled easily by genetic algorithm for the negotiation problem first,and then, considering the global convergence,concurrency features,we use a new genetic algorithm that hybridize local meta heuristic mechanism to speed the search process,improve the efficiency and overcome shortcomings such as the premature and lacking of diversity ***,we give an example to demonstrate that the proposed method is feasible and efficient.

关键词： Web-based negotiation support system Genetic local search metaheuristic

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Engineering Sciences 2012年第2期10卷 56-60页

作者： zhao fujun Wang Hongyu Shen Peiwen Chen Caixian Xu Yanfei School of Energy and Safety Engineering Hunan University of Science and Technology Xiangtan Hunan 411201 China Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Xiangtan Hunan 411201 China School of Energy and Mining Engineering Liupanshui Normal College Liupanshui Guizhou 553004 China

This paper puts forward a new rock fragmentation loading method of dual-cutter head combined dynamic and static loads. By applying the numerical simulation software - RFPA2D, we have done numerical experiment about the sihstone＇ s crushing effect by dynamic load on single cutter head without confining pressure, dynamic load on single cut- ter head with confining pressure 10 MPa and different dual-cutter heads spacing by combined dynamic and static loads with confining pressure 10 MPa. Experimental results show that the confining pressure can obviously affect the rock frag- mentation effect. Combined dynamic and static loads can greatly improve the rock fragmentation effect. There exists an optimal spacing of dual-cutter head that can make the rock fragmentation achieve the desired effect. Through analyzing the acoustic emission accumulative energy and quantity, the authors make a conclusion that the optimum spacing is 30 mm.

关键词： coupled static and dynamic loads rock fragmentation average degree numerical experiment

在线全文

学校读者我要写书评

暂无评论

哈大客专路基冻胀变形特征及防治措施

铁道建筑 2016年第9期56卷 86-90页

作者：赵富军铁道第三勘察设计院集团有限公司天津300142

以哈大客运专线的无砟轨道路基工程为依托,通过路基冻胀变形观测数据统计、现场勘察、试验等,从冻胀机理和控制因素角度对冻胀变形特征进行分析。总结了季节性冻土区无砟轨道路基设计和施工的经验。实践表明:路基基床表层的级配碎石层... 详细信息

以哈大客运专线的无砟轨道路基工程为依托,通过路基冻胀变形观测数据统计、现场勘察、试验等,从冻胀机理和控制因素角度对冻胀变形特征进行分析。总结了季节性冻土区无砟轨道路基设计和施工的经验。实践表明:路基基床表层的级配碎石层应添加水泥进行改良,深大路堑段应设置渗水盲沟,并适当加深冻结深度。

关键词：客运专线无砟轨道路基季节性冻土冻胀变形病害整治

Mechanical properties of rock under coupled static-dynamic loads

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2009年第1期1卷 41-47页

作者： Xibing Li Zilong Zhou fujun zhao Yujun Zuo Chunde Ma Zhouyuan Ye Liang Hong School of Resources and Safety Engineering Central South University Changsha 410083 China Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines Central South University Changsha 410083 China

Rock drilling machine,INSTRON testing system,and SHPB device are updated to investigate the characteristics of rocks at great depth,with high loads from overburden,tectonic stresses and dynamic impacts due to blasting and *** is verified that these testing systems can be used to study the mechanical properties of rock material under coupled static and dynamic loading condition and give useful guidance for the deep mining and underground cavern *** tests to determine the rock strength,fragmentation behavior,and energy absorption were conducted using the updated testing *** is shown that under coupled static-dynamic loads,if the axial prestress is lower than its elastic limit,the rock strength is higher than the individual static or dynamic *** the same axial prestress,rock strength under coupled loads rises with the increasing strain *** coupled static and dynamic loads,rock is observed to fail with tensile *** shear failure may exist if axial prestress is high *** addition,it is shown that the percentage of small particles increases with the increasing axial prestress and impact load based on the analysis of the particle-size distribution of *** is also suggested that the energy absorption ratio of a specimen varies with coupled loads,and the maximum energy absorption ratio for a rock can be obtained with an appropriate combination of static and dynamic loads.

关键词： rock dynamic testing system coupled static-dynamic loads strength fragmentation energy absorption

Distinctive gene expression of stromal cells from transitional zone and peripheral zone of prostate

在线全文

学校读者我要写书评

暂无评论

Distinctive gene expression of stromal cells from transition...