最新刊期
卷 ， 期 2 ， 2000
- 摘要：The vibration responses of floating drilling vessels in random sea waves are studied in this paper by using the theory of random vibrations.On the basis of analysis of previous mechanical models,a multi degree model with a distributed mass is established.The dynamic responses of the system are obtained by using the spectral analysis method.Furthermore,the computational formulae are given for dynamic loads of hook,heave compensation system and derrick.This work provides theoretical support for fatigue strength and fatigue life analysis of the system.关键词：floating drilling vessels;random dynamic analysis;dynamic loads
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- 90
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发布时间：2022-01-07 - 摘要：In this paper,directing against the insufficiency of present pressure servo valve,a new type of pressure difference valve is designed utilizing the ideas that pressure distribution technique in a capillary tube damper and two freedom of spool.It has characteristics of simple in structure,higher anti polluted,low in price and the digital control can be realized.关键词：hydraulic servo system;pressure valve;pressure distribution in capillary tube damper
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- 127
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发布时间：2022-01-07 - 摘要：The feature based parametrical design by combining drawing elements is presented,in this design method,the parametrical feature based drawing elements base is made according to the information needed by CAPP/CAM,the design procedure of the parts is completed by combining the drawing elements,and establish the foundation for passing information from CAD and CAPP/CAM.
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- 32
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发布时间：2022-01-07 - 摘要：This article gives a method of multiprocessor system realization.First,all characteristic of present methods are compared,and then it gives out a design method of selfdefined parallel bus based on overall point of view.This method realizes communication of multiprocessor using the shared mail box structure and competed bus arbitration.The key technique shared mail box structure and competed bus arbitration.The key technique shared RAM board is emphasized,which makes the device lower price,smaller bulk,and more practical.关键词：shared RAM communication;mail box structure;competed bus arbitration
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- 11
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发布时间：2022-01-07 - 摘要：As one of the advanced manufacturing technologies,high speed cutting is the inexorable trend of manufacturing industries and its application is expected to improve the machining efficiency and machining quality enormously.High speed cutting technology involves not only the high speed machining process and high speed cutting mechanisms,but also a considerable variety of related factors,such as tools and machine tools for high speed cutting.Attention is focused on the research status of various technologies related to high speed cutting in this paper.Moreover,the application prospect of high speed cutting technology is also analyzed.关键词：high speed cutting;cutting mechanisms;tool materials
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- 372
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发布时间：2022-01-07 - 摘要：In unconditionnal minmal value of use Newton mode,at face point of Fessian matrix not positive definite or unusual,this papergive trust region preserve let cout go ahead.关键词：trust region;Hessian matrix;positive definite
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- 65
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发布时间：2022-01-07 -
- 摘要：Global asymptotic stability for a class of the fourth order nonlinear system is studied by constructing Liapunovs’ function.A sufficient condition is given out for global asymptotic stability of the system.关键词：nonlinear system;global asymptotic stability;Liapunov’s function
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- 84
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发布时间：2022-01-07 - 摘要：Quota function is a bridge between microquantities and macroquantities of a system.This article discusses the quota functions of various common systems.关键词：system;quota function;ensemble
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- 950
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发布时间：2022-01-07 - 摘要：This paper describes the propagation models of the transverse electrical wave and current distribution in the superconductor cylindrical waveguide based on superconductor electromagnetic theory and the Meissner model. In the superconductor waveguide,the boundary conditions of conventional metals waveguide are not valid,which must be corrected by Meissner model.Many different electromagnetic properties are found in superconductor cylindrical waveguide because of these new boundary conditions.关键词：Meissner effect;boundary condition;superconductor cylindrical;current distribution
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- 73
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发布时间：2022-01-07 - 摘要：This paper raised the parameters that related the critical velocity when vehicle appeared unstable characters by simplifies the model of the wheel being suffered power,and get a simple equation.关键词：moving stableness;sideslip angle;sideslip force;the theorem of linearly approximate stabilization;critical velocity
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- 89
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- 3
发布时间：2022-01-07 - 摘要：The characteristics of CDA alloy membranes are introduced.The CDA membrane structures can be changed,that the hydrophilicity and stability can be improved by liquid phase blend of CDA/P 2.The main factors influenced CDA/P 2 alloy membranes include the compatibility of CDA/P 2,character of solvent and additive.Therefore,CDA/P 2 blend is an effective method for modifying the membrane materials,optimizing the membrane performances.关键词：cellulose acetate;Alloy membrane;structure and performance of membrane;stability;hydrophilicity;compatibility
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- 280
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发布时间：2022-01-07 - 摘要：The possibility of determining the content of F - in sea water with ISE was investigated and a Simple method of determination of F - was established respectively.The precision is better to ±2.0%.关键词：sea water;determination;F -;ISE
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- 164
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发布时间：2022-01-07 - 摘要：A review on the role of Ca 2+ and CaM in the pollen germination,pollen tube growth,generative nucleus division,synergid degeneration,emhryo develomet and other side.关键词：Ca 2+;CAM;double fertilization;angiosperms
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- 156
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- 2
发布时间：2022-01-07 - 摘要：The article found out concrete curved member normal section design parameter C through extreme value analysis.By C value method design,we didn’t only complete some design in particular conditions easily,but also realized to unite rectangular section and tee section design pattern.It makes it simple and direct in train of thought and means during designing curved member normal section.关键词：simply supported beam;normal section load bearing capacity calculation;C value method.
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- 25
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发布时间：2022-01-07 - 摘要：Unbounded prestressed concrete is one of the new techniques,which are recommended by Department of Construction in the “ninth fives”period.It has highly technical content and is a specialized work.We should strictly take quality control in construction.关键词：unbounded prestressed concrete;unbounded prestressed steel;increased in length of prestressed steel.
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- 23
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发布时间：2022-01-07 - 摘要：In this paper,we discuss the application of the Monte Carlo simulation for structural reliability analysis.We give the expression and confidence interval for failure probability in direct sampling method.关键词：structural reliability;Monte Carlo simulation;direct sampling method;failure probability;confidence interval
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- 638
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发布时间：2022-01-07 - 摘要：A kind of temperature measuring circuit with ADC was introduced,The principles and functions of ADC circuit in temperature compensation were discussed in detail,The measuring circuit with ADC is characterizde by accuracy improvement of temperature compensation and elimination the temperature error.关键词：ADC;temperature compensation;sensor;thermal sensitive element
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- 0
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发布时间：2022-01-07 - 摘要：This paper makes comments on the influence of computerized accounting to the accountancy mode through the areas of assessment methods,programs,and the accornting organization as well as placement of accountants.关键词：computerized accounting;assessment models;information system of computerized accounting
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- 159
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发布时间：2022-01-07 - 摘要：In this paper,the authors combine the produce practice to analysis the development of the Lisi spinning,the procedures of produce process and the main technology measures of very produces procedure.关键词：polyester silk like;lisi spinning;design fabrics;process
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- 58
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发布时间：2022-01-07 - 摘要：In this paper,the authors put forward the feature of the air jet loom,the wide use of it in national and overseas,the problems to be solved in product development.关键词：air jet loom;product development;fabric
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- 26
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发布时间：2022-01-07 - 摘要：With the advancement of sprint speed,more and more stress has been laid on the speed and stamina in sprint events training.This paper,probing into the relevant issues in speed and stamina training in terms of physical and biochemical theory,is to provide evidence for physical education and training.关键词：sprint sports;metabolism with and without oxygen;effcetive factors;advancement methods
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- 176
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发布时间：2022-01-07 - 摘要：This paper outlines the main melodies of Olympic sports the foundation and development of modern Olympic games and the contribution of China to it.关键词：Olympic movement;Olympic;The international Olympic Committee;China Olympic Committee
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发布时间：2022-01-07
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