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1.
INTRODUCTIONDNAfingerprintingisamethodforproducingtheDNAfragmentbandpattern ,specificforthegenomeofacertainindividual.Theproductionoftheindividualspecificbandpatternisbasedonthesimultaneousdetectionofseveralhighlypolymorphic,repetitivegenomicregions,wh…  相似文献   

2.
1 Introduction Specificationdescribesthebehaviorofthesystemintermsofresults,whereasanimplementationdefinesbehaviorintermsofprocedure.Thisdistinctiongivesrisetotheinformalnotionofdescribingspecificationas“what”asopposedtodescribingimplementationas“ho…  相似文献   

3.
OntheEstrangementinTheMetamorphosisAnApproachfromthePerspectiveofAestheticsofReceptionYangxiangKafkasmasterpiece,TheMetamo...  相似文献   

4.
INTRODUCTIONTheentomophthoraceousfungus,Zoophthoraanhuiensis (Li)Humber,isanaphid specificpathogenonlyknownfromChina .Thisfungalpathogenplaysanimportantroleinthenaturalcontrolofaphidpopulationsinthemiddle lowerreachoftheChangjiangRiverduringautumnandwint…  相似文献   

5.
INTRODUCTIONThemolecule topologyindexandquantumchemistryindex ,twoimportantparametersforstudyonthestructure activityrelationship ,canbeobtainedatdifferentlevelsofmolecularstruc tureexpression ,respectively.Themolecule topologyindexisobtainedfromthemolecul…  相似文献   

6.
NomenclatureAArea(m2)DhHydraulicDiameter(m)EEnergyContent(J)fPressureLossCoeficientαVoidFractionHSpecificEnthalpy(J/kg)IInert...  相似文献   

7.
INTRODUCTIONItisveryimportantforChinatoachievesustainabledevelopmentbecauseoftheprimaryroleofChinaastheadvocateofpeaceintheworldandespeciallyintheAsiaPacificregion.OverthepastseveraldecadesChinahasincreasinglycometorealizetheTechnologicalInnovation(TI…  相似文献   

8.
NomenclaturesAArea(m2)EEnergyControl(J)fPressureLossCoeficientaVoidFractionHSpecificEnthaply(J/kg)IInertance(m)KFrictionLossC...  相似文献   

9.
1 Introduction Inimagecompressioncodingschemes,variousimagecodingtechniquessuchastransformcodinghavebeendeveloped.Whilethesetechniqueshaveledtorelativelyhighqualityreconstructedimagesatbitratesaround1.0b/pixelormore,theysometimesproducespecifictypeof…  相似文献   

10.
Colourwordsarewordsusedtodescribethecoloursofdifferentthings.Besidesindicatingtheirspecificcolours,suchasred ,yellow ,blackandwhite ,theyalsoreflectthedifferentculturalconnota tionsindifferentlanguages.Forexample,Chinesegirlslikewearingreddressesontheirwe…  相似文献   

11.
本文建立了一类两自由度变碰撞面的碰撞振动系统动力学模型,获得了系统的周期响应,推导出系统n-1周期运动的四维Poincaré映射。利用Poincaré映射方法,对系统单碰撞周期运动的稳定性与分岔进行分析,分析了系统n-1周期运动的Hopf分岔、周期倍化分岔及强共振情况下的亚谐分岔,研究了当分岔参数变化时碰撞振动系统由概周期碰撞运动向混沌运动的演化过程,为冲击振动系统的优化设计提供了理论依据。  相似文献   

12.
采用混沌时间序列分析方法分别对以经典混沌信号和地震动为激励的结构响应进行混沌特性分析,从关联维数、Kolmogorov熵及最大Lyapunov指数等定量指标的角度,考察结构自振周期、地震动的类型和幅值等因素对结构地震响应的非线性特性的影响。研究结果表明:在经典混沌信号和地震动作用下,经过结构的放大和滤波作用,结构加速度响应仍然保留了混沌特性,且通过混沌参数的变化程度能够判断结构是否进入弹塑性状态。结构自振周期为结构加速度响应的混沌特性的主要影响因素;幅值对经典混沌信号作用结构下加速度响应的混沌特性影响较为显著;而地震动的类型、幅值等因素对地震动作用下响应的混沌特性影响更为显著。  相似文献   

13.
A unit of study for gifted 4th and 5th graders is described on the subject of mathematical periodicity and chaos and the underlying physical processes which produce these phenomena. A variety of hands-on experiments and the use of various data analysis tools and computer aids provide students with powerful raw material for their analysis, interpretation, and understanding. The concepts of simple periodic motion (e.g., a pendulum), complex superposition of motions (e.g., the vibrations in musical instruments), and chaotic sequences (e.g., stock prices) are covered, with numerous practical examples. Opportunities to involve related activities emphasizing language arts, history, and graphic art are included. The student response to the material is documented.  相似文献   

14.
采用主成分分析法与混沌时间序列分析方法对地震动的非线性特性进行分析,分别从定性与定量的角度考察地震动的非线性特性;探讨了地震动的要素对其混沌特性的影响。结果表明:地震动最大幅值的变化对混沌特性没有影响,而持时、频谱特性、采样频率等要素对混沌的定量指标均产生了影响。  相似文献   

15.
The new chaos control method presented in this paper is useful for taking advantage of chaos. Based on sliding mode control theory, this paper provides a switching manifold controlling strategy of chaotic system, and also gives a kind of adaptive parameters estimated method to estimate the unknown systems' parameters by which chaotic dynamical system can be synchronized. Taking the Lorenz system as example, and with the help of this controlling strategy, we can synchronize chaotic systems with unknown parameters and different initial conditions. Project supported by Doctoral Subject Research Fund of Ministry of Education of China (1999033512) and Science and Technology Plan Fund of Zhejiang Province (991110412)  相似文献   

16.
A 3D continuous autonomous chaotic system is reported, which contains a cubic term and six system parameters. Basic dynamic properties of the new Van der Pol Jerk system are studied by means of theoretical analysis and numerical simulation. Based on the Silnikov theorem, the chaotic characterisitics of the dynamic system are discussed. Using Cardano formula and series solution of differential equation, eigenvalue problem and the existence of homoclinic orbit are studied. Furthermore, a rigorous proof for th...  相似文献   

17.
INTRODUCTIONChaoticmotionisacomplexnonlinearmo tion ,whoseorbitstrajectoryinthephaseplaneisverycomplexbutnotstochastic.Chaosplaysanimportantroleindynamicalsystemsandisap pliedinmanyfieldssuchasphysics ,chemistry,economics,andsoon (Heetal.,2 0 0 2 ;Tongeta…  相似文献   

18.
新Lu混沌系统是一类重要的新混沌系统,它显示了不同于以往混沌系统的复杂的动力学特性.文章主要研究了新Lu混沌系统与统一混沌系统的同步控制问题.基于Lyapunov稳定性定理,利用主动控制和非线性反馈控制均实现了两混沌系统的异结构同步.同时,严格的数学理论分析和数据仿真结果都证明了控制方法的有效性.  相似文献   

19.
通过一系列动力学分析,验证了一个纠缠系统是混沌的.当混沌纠缠实现时,所有的平衡点是不稳定的鞍结点.数值计算显示这个系统有一个正的Lyapunov指数,这表明该系统是混沌的.通过局部放大的分岔图验证了系统由倍周期分岔通向混沌的过程,并分析了该混沌系统的Hopf分岔现象.  相似文献   

20.
对复摆模型的强迫振动方程进行数值求解,显示出复摆运动在外驱动力作用下由倍周期分岔走向混沌,验证了其混沌解的"蝴蝶效应",并得到了复摆作混沌运动的几个奇怪吸引子.  相似文献   

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