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等差式液压机械无级变速传动系统分析及其参数优化设计 被引量:1
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作者 刘博 苑士华 郭晓林 《机械传动》 CSCD 北大核心 2006年第6期47-48,69,共3页
液压机械无级传动是一种多功率流无级传动系统,具有无级调速、高效率的特性,是大功率车辆较理想的传动形式。本文介绍了等差式液压机械无级传动的基本原理,探讨了各个组成机构的关系;采用优化理论,对行星排参数、传动比参数进行了优化... 液压机械无级传动是一种多功率流无级传动系统,具有无级调速、高效率的特性,是大功率车辆较理想的传动形式。本文介绍了等差式液压机械无级传动的基本原理,探讨了各个组成机构的关系;采用优化理论,对行星排参数、传动比参数进行了优化设计。计算结果表明本文所采用的优化算法具有较大的实际应用价值。 展开更多
关键词 等差式 液压机械传动 参数优化设计
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液压机械传动中机械变速箱传动比规律研究 被引量:4
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作者 韩兆林 胡纪滨 《机械设计》 CSCD 北大核心 2003年第12期39-42,共4页
提出了液压机械无级传动系统的正相位、反相位和等差式、等比式的概念,明确了等差式液压机械无级传动和等比式液压机械无级传动的一般性组成环节,分析了正相位工况和反相位工况下功率的分流和汇流情况,揭示了功率分流点和汇流点的不同... 提出了液压机械无级传动系统的正相位、反相位和等差式、等比式的概念,明确了等差式液压机械无级传动和等比式液压机械无级传动的一般性组成环节,分析了正相位工况和反相位工况下功率的分流和汇流情况,揭示了功率分流点和汇流点的不同是两类方案具有不同工作特性的根本原因。通过分析各液压机械段纯机械点的输出转速,推导了两类方案机械变速箱传动比的规律及机械变速箱传动比与汇流排机械路传动比的关系。根据各自的特性,等差式液压机械无级传动适用于履带车辆的无级转向系统;等比式液压机械无级传动适用于车辆的直驶推进系统。 展开更多
关键词 液压机械 传动比 等差式 等比 无级传动系统 变速箱
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液压机械无级传动特性分析
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作者 夏永清 《科技创新导报》 2008年第29期89-90,共2页
本文主要介绍了等差式、等比式液压机械无级传动各个组成机构的关系;并对等差式、等比式液压机械无级传动进行了特性分析。
关键词 无级传动 液压机械传动 等差式 等比
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On the Asymptotic Property of Solutions to Some Nonlinear Dissipative Wave Equations 被引量:1
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作者 梁保松 叶耀军 李慧平 《Chinese Quarterly Journal of Mathematics》 CSCD 2002年第4期83-86,共4页
In this paper the decay of global solutions to some nonlinear dissipative wave equations are discussed, which based on the method of prior estimate technique and a differenece inequality.
关键词 nonlinear wave equation asymtotic property global solution
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On a Class of Second Order Differential Inequality with Continuous Distributed Deviating Arguments
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作者 王培光 葛渭高 《Journal of Beijing Institute of Technology》 EI CAS 1999年第4期337-341,共5页
Aim To study properties of solutions to a class of second order differential inequality with continuous distributed deviating arguments. Methods A direct analysis technique was used. Results and Conclusion Some suf... Aim To study properties of solutions to a class of second order differential inequality with continuous distributed deviating arguments. Methods A direct analysis technique was used. Results and Conclusion Some sufficient conditions that ensure a class of second order delay differential inequality having no eventually positive solutions were obtained, which generalized some given results. Using the results, some oscillatory criteria for solutions of the hyperbolic equation with distributed deviating arguments can be established. 展开更多
关键词 INEQUALITY distributed deviating arguments positive solution
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Improvements of Difference Inequalities and Integral Inequalities
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作者 吴述金 郭小林 《Journal of Shanghai Jiaotong university(Science)》 EI 2003年第1期103-106,共4页
A delay difference inequality was studied, and several results were obtained, which improve the known results. Then a typical integral inequality with two independent variables was studied, and some results were obtai... A delay difference inequality was studied, and several results were obtained, which improve the known results. Then a typical integral inequality with two independent variables was studied, and some results were obtained, which extend the known results. 展开更多
关键词 difference inequalities differential inequalities
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An Existent Condition of Error Bounds for Abstract Linear Inequality System
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作者 ZHAI Zhi-chun 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2008年第3期344-348,共5页
We consider the abstract linear inequality system (A, C, b) and give a sufficient condition for the system (A, C, b) to have an error bound, which extends the previous result.
关键词 error bounds abstract linear inequality system quasi*-Bishop-Phelps cones
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生态伦理学的使命与宿命 被引量:7
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作者 李义天 《天津社会科学》 CSSCI 北大核心 2009年第3期27-33,共7页
生态伦理学作为伦理学的一个应用性分支,具备伦理学的所有基本属性。一方面,正如伦理学的使命不是提出道德要求,而是为道德要求提供道德理由一样,生态伦理学的使命也不在于提出"保护生态"这一道德要求,而在于为该要求赋予道... 生态伦理学作为伦理学的一个应用性分支,具备伦理学的所有基本属性。一方面,正如伦理学的使命不是提出道德要求,而是为道德要求提供道德理由一样,生态伦理学的使命也不在于提出"保护生态"这一道德要求,而在于为该要求赋予道德理由和依据。人类中心主义和非人类中心主义正是生态伦理学为完成该使命而形成的两种基本论证方案:前者以"等差式的伦理关联"为理由,而后者以"一致性的伦理关联"为依据。另一方面,生态伦理学同样具有伦理学的根本局限,即,纵然提供了很好的道德理由或依据,也不能担保人们在实践上必然遵循道德要求。因此,针对生态问题的讨论必须突破伦理学层面,而去挖掘那些阻扰人们保护生态的政治症结。 展开更多
关键词 生态伦理学 道德理由 等差式伦理关联 一致性伦理关联
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On the Asymptotic Property of Solution for Some Nonlinear Evolution Equation of Second Order
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作者 叶耀军 《Journal of Mathematical Research and Exposition》 CSCD 北大核心 2004年第1期44-48,共5页
In the article we show the decay of the solution for some nonlinear evolution equation of second order by using a difference inequality.
关键词 nonlinear evolution equation initial-boundary value problem decay property of global solution.
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Sharp large deviation results for sums of independent random variables 被引量:1
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作者 FAN XieQuan GRAMA Ion LIU QuanSheng 《Science China Mathematics》 SCIE CSCD 2015年第9期1939-1958,共20页
We show sharp bounds for probabilities of large deviations for sums of independent random variables satisfying Bernstein's condition. One such bound is very close to the tail of the standard Gaussian law in certai... We show sharp bounds for probabilities of large deviations for sums of independent random variables satisfying Bernstein's condition. One such bound is very close to the tail of the standard Gaussian law in certain case; other bounds improve the inequalities of Bennett and Hoeffding by adding missing factors in the spirit of Talagrand(1995). We also complete Talagrand's inequality by giving a lower bound of the same form, leading to an equality. As a consequence, we obtain large deviation expansions similar to those of Cram′er(1938),Bahadur-Rao(1960) and Sakhanenko(1991). We also show that our bound can be used to improve a recent inequality of Pinelis(2014). 展开更多
关键词 Bernstein’s inequality sharp large deviations Cramér large deviations expansion of BahadurRao sums of independent random variabl
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Some conditional results for conditionally strong mixing sequences of random variables 被引量:1
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作者 YUAN DeMei LEI Lan 《Science China Mathematics》 SCIE 2013年第4期845-859,共15页
The relation between strong mixing and conditionally strong mixing is answered by examples,that is,the strong mixing property of random variables does not imply the conditionally strong mixing property,and the opposit... The relation between strong mixing and conditionally strong mixing is answered by examples,that is,the strong mixing property of random variables does not imply the conditionally strong mixing property,and the opposite implication is also not true.Some equivalent definitions and basic properties of conditional strong mixing random variables are derived,and several conditional covariance inequalities are obtained.By means of these properties and conditional covariance inequalities,a conditional central limit theorem stated in terms of conditional characteristic functions is established,which is a conditional version of the earlier result under non-conditional case. 展开更多
关键词 strong mixing conditionally strong mixing conditional covariance inequality conditional inde- pendence conditional stationarity conditional central limit theorem
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HIGHLY NONCONFORMING FINITE ELEMENT APPROXIMATIONS FOR A FOURTH ORDER VARIATIONAL INEQUALITY WITH CURVATURE OBSTACLE 被引量:1
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作者 SHIDongyang CHENShaochun IchiroHagiwara 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2005年第1期136-142,共7页
The purpose of this paper is to obtain the optimal error estimates of O(h) for the highly nonconforming elements to a fourth order variational inequality with curvature obstacle in a convex domain with simply supporte... The purpose of this paper is to obtain the optimal error estimates of O(h) for the highly nonconforming elements to a fourth order variational inequality with curvature obstacle in a convex domain with simply supported boundary by using the novel function splitting method and the orthogonal properties of the nonconforming finite element spaces.Morley's element approximation is our special case. 展开更多
关键词 variational inequality curvature obstacle nonconforming finite element optimal error estimation
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