共查询到20条相似文献，搜索用时 15 毫秒
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李威 《遵义师范学院学报》1996,(1)
How do children acquire their mother tongue? Are the process in acquiring L1 (first language) and L2 (second language) the same? These questions always arouse the interests of the linguists. For many years, linguists have made a lot of research on first language acquisiton. They have put forward several hypothesis 相似文献
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研究多臂机器人和多机器人构造的动力学．两个或两个以上机械臂夹持物体时可形成一个或更多闭环，故可视为约束多体系统进行研究．可用基于凯恩方程和休斯敦方法的最新程式进行约束多体系统的动力学分析，此程式给出方程的数值解和系统的运动仿真．用上法分析了ＰＵＭＡ７６０和５６２机器人组成的双机器人系统，理论分析和实验结果吻合良好 相似文献
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Li Ji-bin 《蒙自师范高等专科学校学报》1990,(4)
<正> Chaotic motion refers to complicated orbits in dynamical systems.It occurs even in deterministic system governed by simple differential equations and its present has been experimentally verified for many system in several disciplines.In this paper we discuss some of mathematical understanding of chaos. 相似文献
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《邢台学院学报》1994,(4)
When we read Shake speare's tragedies,we can not help feeling thatthe most painful and the most pathetic one might be Othello.For inHamlet,the hero knows his rival olearly to be his uncle clandius,themost vicious,incestus villain,thus he is on guard;in King Lear,theold king is the only victim of human ingratitude;only in othello,thenoble hearted hero is completely in the darkness,unaware of his enemy,and mislays his trust upon the most incomparably ingenious and unscru-pulous villain.He is led by the nose.to believe that his newly weddedwife is not as pure as he has thought before and finally to strangle thesublimely innocent and pure angel upon her wedding sheet,conceiving ofhimself as the agent not of vengeance but of divine justice.This mightbe the cruelest act that has ever happened inhuman history.This tragedyis partly due to the intrigues of the shameless villain Iago,partly dueto the vunerableness of the hero's character. 相似文献
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This paper presents a discussion on a problem suggested by N.Salinas(J.Operator Theory,Vol.10,1983),i.e.,if T=(T_1,T_2,…,T_n)is a commuting n-tuple ofhyponormal operators on a complex Hilbert space,do we have(1)(2)δ(T-μ)=dist(μ,σ_l(T)),μ∈C~n?It is proved that the problems(1)and(2)are both true for some commuting n-tuples ofsemihyponormal operators.In general case,problem(1)has a negative answer.As an ap-plication,we point out that there exists a commuting n-tuple of hyponormal operatorsT(n≥2),such that|λ|<,where σ_T(T)denotes J.L.Taylor'sjoint spectra of T,even if the condition of Taylor's joint spectra of T is given. 相似文献
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We give the sufficient conditions of Retaining Region Theorem and Maximum Modulus principle, The results of this paper are generatizations of rele rant results in [1,2]. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｈｙｓｉｃｓｏｆａｖｏｒｔｅｘｌａｔｔｉｃｅ (ＶＬ)ｉｎｔｙｐｅ ＩＩｓｕｐｅｒｃｏｎｄｕｃｔｏｒｓｈａｓｂｅｅｎｔｈｅｆｏｃｕｓｏｆｉｎｔｅｒｅｓｔｓｉｎｃｅｔｈｅｂｅｇｉｎｎｉｎｇｏｆｈｉｇｈ Ｔｃ ｒｅｓｅａｒｃｈ .Ｉｔｉｓｗｅｌｌ ｋｎｏｗｎｔｈａｔ,ａｆｔｅｒｔｈｅｅｘｔｅｒｎａｌｍａｇｎｅｔｉｃｆｉｅｌｄｅｘｃｅｅｄｓｉｔｓｃｒｉｔｉｃａｌｖａｌｕｅＨｃ1 ,ｔｈｅｍａｇｎｅｔｉｃｆｉｅｌｄｃａｎｐｅｎｅｔｒａｔｅａｔｙｐｅ ＩＩｓｕｐｅｒｃｏｎｄｕｃｔｏｒｉｎ… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｏｔｅｎｔｉａｌｕｓｅｒｏｆｃｏｒｅｃｏｌｌｅｃｔｉｏｎｆａｌｌｓｉｎｔｏｔｈｒｅｅｍａｉｎｇｒｏｕｐｓ:ｐｌａｎｔｂｒｅｅｄｅｒｓｗｈｏｗｉｓｈｔｏｆｉｎｄａｎｄｕｔｉｌｉｚｅｇｅｒｍｐｌａｓｍ ;ｇｅｒｍｐｌａｓｍｓｐｅｃｉａｌ ｉｓｔｓｗｈｏｗｉｓｈｔｏｓｔｕｄｙｇｅｒｍｐｌａｓｍｏｒｇｅｎｅｔｉｃｖａｒｉ ａｔｉｏｎ ;ｃｕｒａｔｏｒｓｗｈｏｒｅｑｕｉｒｅａｓｓｉｓｔａｎｃｅｗｉｔｈｇｅｒｍ ｐｌａｓｍｍａｎａｇｅｍｅｎｔ (Ｍａｃｋａｙ ,1 995) .Ｇｅｒｍ ｐｌａｓ… 相似文献
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ＯＮＴＨＥＣＯＮＶＥＲＧＥＮＣＥＯＦＧＵＭＭＥＬＭＡＰＰＩＮＧＦＯＲＳＴＥＡＤＹ－ＳＴＡＴＥＳＥＭＩＣＯＮＤＵＣＴＯＲＥＱＵＡＴＩＯＮＳＧｕａｎＰｉｎｇ（管平）ＷａｎｇＹｕａｎｍｉｎｇ（王元明）（ＤｅｐａｒｔｍｅｎｔＯｆＭａｔｈｅｍａｔｉｃｓａｎｄＭ... 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＭｏｖｉｎｇｊｅｔｃｏｎｔａｉｎｉｎｇｓｕｓｐｅｎｓｉｏｎｓｉｎｃｌｕｄｉｎｇｃｏａｌｐｏｗｄｅｒ,ｄｒｏｐｌｅｔｓａｎｄｓｏｏｎｗｉｄｅｌｙｅｘｉｓｔｓｉｎｔｅｃｈｎｉｃａｌａｐｐｌｉｃａｔｉｏｎｓｓｕｃｈａｓａｉｒｃｒａｆｔｕｓｉｎｇｆｕｅｌｆｏｒｐｏｗｅｒ.ＬｉｎＪｉａｎｚｈｏｎｇｅｔａｌ.( 2 0 0 0 )ｗｈｏｓｅｓｔｕｄｙｓｈｏｗｅｄｔｈａｔｔｈｅｅｒｏｓｉｏｎｏｆｗａｌｌｓｏｆａｄｅｖｉｃｅｖａｒｉｅｓｗｉｔｈｔｈｅｃｈａｎｇｅｏｆｔｈｅｃｏｈｅｒｅｎｔｓｔｒｕｃｔｕ… 相似文献
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EFFECT OF CORROSION ON BOND BEHAVIOR AND BENDING STRENGTH OF REINFORCED CONCRETE BEAMS 总被引：1，自引：0，他引：1
ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒｅｉｓｇｒｏｗｉｎｇｃｏｎｃｅｒｎｆｏｒｃｏｒｒｏｓｉｏｎｄａｍ ａｇｅｉｎｒｅｉｎｆｏｒｃｅｄｃｏｎｃｒｅｔｅ (ＲＣ)ｓｔｒｕｃｔｕｒｅｓｗｉｔｈｓｅｖｅｒａｌｄｅｃａｄｅｓ’ｓｅｒｖｉｃｅ.Ｔｈｅｒｅｉｎｆｏｒｃｅｍｅｎｔｃｏｒ ｒｏｓｉｏｎｏｆＲＣｃｏｎｓｔｒｕｃｔｉｏｎｓｐｒｏｂａｂｌｙｉｓｔｈｅｍｏｓｔｓｉｇｎｉｆｉｃａｎｔｐｒｏｂｌｅｍａｎｄｏｕｔｗｅｉｇｈｓｏｔｈｅｒｆｏｒｍｓｏｆｄｅｔｅｒｉｏｒａｔｉｏｎ .ＳｔｕｄｉｅｓｂｙＰｅａｔｔｉｅｅｔａｌ.( 1 9… 相似文献
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The transfer matrix of wrist force sensor is important for decoupling theoutput signals and enhancing the precision of wrist force sensor.This paper solves thetransfer matrix from the realization of optimal approximation of polynomial.First,thegeneral transfer matrix algorithm in the sense of L~2 and two kinds of modified algorithmare proposed.Then,starting from uniform approximation,the optimal transfer matrixalgorithm is offered and solved by the use of linear programming.The results of experi-ment and computation prove that these algorithms are effective. 相似文献
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防洪堤坝不仅在河道洪水超过设计泄洪能力时才会发生防洪事故，水力因素的不确定性也会引起洪灾损失。但在大多数水文分析计算及防洪规划设计中，是不考虑这种水力风险的。本文应用风险理论探讨了这种水力风险的大小及其估算方法，为完善现有的防洪理论提供依据，应用结果表明，在防洪标准较低的河道，可以不考虑这种水力风险；而在防洪标准较高的河道，则必须重视这种水力风险，另外还要考虑洪水荷载的偏态分布特征． 相似文献
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孙蔚虹 《淮阴师范学院学报(哲学社会科学版)》1994,(1)
ＴＨＥＩＮＦＬＵＥＮＣＥＯＦＬＡＮＧＵＡＧＥＡＣＱＵＩＳＩＴＩＯＮＴＨＥＯＲＹＯＮＬＡＮＧＵＡＧＥＴＥＡＣＨＩＮＧ孙蔚虹木文阐述并比较第一语言习得中孩子学习母语必须经历的过程及途径，以及第二语言习得中学习者在非课堂环境中经历的习得过程和途径，分析两者... 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＦｏｒｎ≥ 2 ,ｍ≥ 2 ,ｌｅｔＳｎ - 1 ａｎｄＳｍ - 1 ｂｅｔｈｅｕｎｉｔｓｐｈｅｒｅｉｎＲｎａｎｄＲｍｒｅｐｅｃｔｉｖｅｌｙ ,ｅｑｕｉｐｐｅｄｗｉｔｈｔｈｅｎｏｒｍａｌｉｚｅｄｌｅｂｅｓｇｕｅｍｅａｓｕｒｅ .ＬｅｔΩｂｅａｆｕｎｃｔｉｏｎｄｅｆｉｎｅｄｏｎＳｎ - 1 ×Ｓｍ - 1 ｓａｔｉｓｆｙｉｎｇΩ∈Ｌ1 (Ｓｎ - 1 ×Ｓｍ - 1 )ａｎｄ∫ｓｎ-1 Ω(ｕ ,ｖ)ｄｕ =0 ,( ｖ ∈Ｓｍ- 1 )∫ｓｍ-1 Ω(ｕ ,ｖ)ｄｕ=0 ,( ｖ ∈Ｓｎ- 1 ) ( 1 )ＴｈｅｃｏｒｒｅｓｐｏｎｄｉｎｇＭａｒｃｉｎｋｉｅ… 相似文献