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The Limit Cycle of Ecosystem with Holling's Type Ⅱ Functional Response and Allee Effect

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生物数学学报 1998年第1期13卷 1-8页

作者： Yang Pinghua Xu Rui Dong Shijie(Shijia zhuang Mechanical engineering college,{2. 050003,P.R.china) Shijia Zhuang Mechanical engineering college Shijiazhuang 050003 P. R. China

This paper studied class of predatorprey system with Holling's type Ⅱ functional response and Allee effect as follows By using qualitative theory of ordinary differential equations,nonexistence,existence and uniquene... 详细信息

关键词： Allee effect limit cycle heteroclinic orbit

Phase transformation refinement of coarse primary carbides in M2.high speed steel

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Progress in Natural Science:Materials International 2011年第2期21卷 180-186页

作者： Fu-sheng PAN~(1,2.,Wei-qing WANG~1,Ai-tao TANG~1,Li-zhi WU~3,Ting-ting LIU~1,Ren-ju CHENG~1 1.college of Materials Science and engineering,Chongqing {2.,Chongqing 400030,china 2.Chongqing Academy of Science and Technology,Chongqing 40112.,china 3.Quality Department,Heye Science and Technology Co.,Ltd.,shijiazhuang 05003.,china [a] college of Materials Science and engineering Chongqing University Chongqing 400030 China [b] Chongqing Academy of Science and Technology Chongqing 401123 China [c] Quality Department Heye Science and Technology Co. Ltd. Shijiazhuang 050031 China

The decomposition of the coarse primary M2. carbide in M2.high speed steel was investigated by using optical microscope,scanning electron microscope,energy dispersive spectrometer and X-ray diffraction *** is indicated that the SEM observation using deeply etched samples can clearly reveal the details of the decomposition products of primary M2. eutectic *** MC is granular and M6C is peanut-shaped in the decomposition products,and the decomposition products are found to be very small in the *** the increase of annealing temperature and duration,part of the peanut-shaped M6C carbides change to simple skeleton-shaped *** phase transformation refinement of primary M2. carbides in M2.steel by the decomposition of metastable M2. carbides at high temperature can be obtained if suitable annealing parameters are *** complete decomposition of M2. to M6C and MC will occur when（1 100℃,4 h） or（1150℃,2.h） annealing treatment is employed in M2.high speed steel.

关键词： high speed steel carbides decomposition phase transformation refinement morphology

Moore-Smith Convergence in L-Fuzzifying Topological Spaces

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Journal of Mathematical Research and Exposition 2011年第5期31卷 770-780页

作者： Wei YAO1,2. Ling Xia LU3 1. college of Mathematics and Information Science, Shaanxi Normal university, Shaanxi 710062. P. R.{2. 2. college of Science, Hebei university of Science and Technology, Hebei 050018, P. R.{2. 3. School of Mathematics and Science, shijiazhuang university of economics, Hebei 05003., P. R.{2. college of Mathematics and Information Science Shaanxi Normal University college of Science Hebei University of Science and Technology School of Mathematics and Science Shijiazhuang University of Economics

This paper presents a definition of L-fuzzifying nets and the related L-fuzzifying generalized convergence spaces. The Moore-Smith convergence is established in L-fuzzifying topology. It is shown that the category of L-fuzzifying generalized convergence spaces is a cartesianclosed topological category which embeds the category of L-fuzzifying topological spaces as a reflective subcategory.

关键词： L-fuzzifying topology L-fuzzifying filter L-fuzzifying net L-fuzzifying generalized convergence space topological category cartesian-closed.

Design Theory of Intellectualized Computer Aided Instruction and Its Applications

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Journal of Systems Science and Systems engineering 2001年第2期13卷 210-217页

作者： CUI Hong-bin 1, WANG Ai-min 2. YU Dong-mei 11.Hebei university of Science and Technology, shijiazhuang 050054,{2.2.Anyang Teachers college, Anyang 455000,{2. Hebei university of Science and Technology Shijiazhuang 050054 China Anyang Teachers college Anyang 455000 China

This paper presents design theory and method of the intellectualized CAI, which includes the organization and expression of the teaching content and the teaching requirement determination in teaching process, and deve... 详细信息

关键词： CAI intellectualization software

Thoughts on the Countermeasures for the Construction of Hebei’s Open Economy

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Thoughts on the Countermeasures for the Construction of Hebe...

Performance of the Cement Matrix Composite Material With Rubber Powder

第十一届全国经济管理院校工业技术学研究会

作者： Yanxiu WANG School of economics and Trade,shijiazhuang economic {2.,HEBEI shijiazhuang,china

When we open the economy to international transactions we have to take into the effects of industrial *** in Hebei has been increasingly open,international trade developed quickly and optimization of Industrial structure has to be achieved by further *** an open economy,the escalation of industrial structure not only depends on its domestic resources,but also on foreign *** open-door policy of Hebei which facilitated free resource mobility and outward investment between the two regions should be *** thesis focuses on the prospects of modulating industrial structure of Hebei in an open economy system and its practical measures through theoretical and statistical analysis.

关键词： Open Economy Industrial Export-Oriented Development Foreign Trade

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Journal of Wuhan university of Technology(Materials Science) 2004年第1期19卷 77-80页

作者：宋少民 Beijing Institute of Civil engineering and Architecture

The effect of the deferent rubber content substituted for fine aggregate on the mortar performance was *** effects of the rubber coated with the coating materials on the mortar compressive strength,bending strength and impact work were *** optimum rubber powder content and the suitable coating material were *** the electrical probe test-BEI,SEI and calcium ion distribution,and the slight crack and the interface between the rubber and cement matrix are *** results show that the rubber powder coated with the surface treatment materials A,B and C has the capability of absorbing a large amount of energy under the compressive and flexural load and the slight cracks of R-C were controlled and restrained.

关键词： rubber powder cement matrix composite material toughness coating material

Research on Typical Faults Test and Simulation for Artillery

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Research on Typical Faults Test and Simulation for Artillery

Suspended sediment flux of river:Wavelet analysis in the Panlong basin of the Upper Red River (Honghe River),china

2.07 8th International Conference on Electronic Measurement & Instruments（ICEMI’2.07）

作者： Cao Lijun 1 Hu Huibin 2.Shao Xinjie 1 Tian Guang 1 1.shijiazhuang Mechanical engineering {2.,shijiazhuang 050003 china,2.shijiazhuang Army Command {2.,shijiazhuang 050084 china

To illustrate the typical fault test and simulation technologies for artillery,three key aspects are discussed in detail,which are selections of characteristic parameters,dynamic fuzzy inference and virtual *** denote and analyze the typical faults,an index system is proposed from mission reliability *** to the deficiencies of traditional fuzzy evaluation method,a new dynamic fuzzy inference method is put forward and adopted into fault forecast *** simulate the typical fault emergence and development process,virtual prototype of large-caliber artillery is established and four groups of fault relationships are given as simulation *** on the fault test and simulation system,severe faults will be predicted and commander can determine corresponding campaign decision and maintenance decision.

关键词： Fault test Fault forecast Virtual prototyping Simulation Artillery

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Chinese Science Bulletin 2007年第A02期52卷 172-179页

作者： DING WenRong~(1,2.) ZHOU Yue~(1,3) L XiXi~4 1 The Faculty of Environment Science and engineering,Kunming university of Science and Technology,Kunming 650093,{2. 2.college of Tourism and Geography Science,Yunnan Normal university,Kunming 650092.{2. 3 Yunnan university of Finance and economics,Kunming 6502.1,{2. 4 Department of Geography,National university of Singapore 1192.0,Singapore Univ Sci and Technol Kumasi Fac Environm Sci and Engn Kunming 650093 Peoples R China.

这份报纸把小浪分析用于检验变化趋势，多时间规模变化，在上面的红河的 Panlong 盆的推迟的沉积流动(SSF ) 的周期、突然的变化特征，中国。结果显示 SSF 从 1951 ～ 1997 增加了，但是自从 1998，衰退了。SSF 的变化把多时间规模特征... 详细信息

这份报纸把小浪分析用于检验变化趋势，多时间规模变化，在上面的红河的 Panlong 盆的推迟的沉积流动(SSF ) 的周期、突然的变化特征，中国。结果显示 SSF 从 1951 ～ 1997 增加了，但是自从 1998，衰退了。SSF 的变化把多时间规模特征和变化在不同时间时期改变了。三周期的时间规模， 4， 7 和 2. 年，被决定。2. 年的周期的时间规模，是在三次规模之中的最明显的，通过整个研究时期延长了，而第 4-a 7 年的时间规模在某些时间时期仅仅是明显的。分别地有 2. 次越过 4 年的时间规模，越过 7 年的时间规模的 16 次和越过 2. 年的时间规模的 5 次的突然的变化。根据统计的聚会和气候数据分析，我们断定人的活动是导致了多时间规模的 SSF，而是特征的变化趋势的主要原因，周期、突然的变化被气候变化主要影响。

关键词：河流中国红河微波分析

Study on Design of Magnetic Flux Leakage Testing Instrument for gun

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微计算机信息 2005年第6期 115-116+82页

作者： Wang,Changlong Fu,Junmei(Institute of Electronic and Information, Xi’an Jiaotong university)Yingwei Xu,Zhangsui(Ordnance engineering {2., shijiazhuang 050003, china)Wang,Changlong Jin,

The paper describes the magnetic Dipole model of magnetic flux leakage(MFL) based on the principle of MFL testing, proposes the effects of surface defect width and depth on MFL field, and presents the peak-peak amplitude algorithm that the features of defect signal are extracted. The peak-peak amplitude and separation, signal gradient variation are used as the distinguish criterions of defects. The principle of instrumental hardware design is also introduced. The introduced gun MFL testing instrument is successfully employed in the nondestructive evaluation of gun.

关键词： magnetic flux leakage defect nondestructive evaluation peak-peak amplitude algorithm hardware design