Abstract:在合理模拟临跨的静态荷载以及质量影响的基础上.采用三维有限元对南水北调工程洺河大型渡槽典型槽段单跨渡槽进行结构地震动力分析.对于影响渡槽结构动力响应的盆式支座、槽内水体与结构的流固耦合作用以及桩基-土体的动力相互作用,参照相关规范的原则和相关研究成果,在尽可能反映其实际影响和合理简化的基础上进行模拟,研究了结构自振特性、结构各部位的动力位移、应力以及内力响应.计算结果表明:采用不同水体模拟方法和不同计算分析方法得到的动力响应规律是一致的,动力响应值比较接近.

Abstract:Three dimensional coupled aseismatic dynamic analysis of typical single span structure system of Minghe large scale aqueduct in south-to-north water transfer project was carried out,based on the rational thinking of static load and mass coming from the ne

Abstract:Based on the transmitting character of scattered wave,the attenuating wave multi-transmitting artificial boundary(including 2-D and 3-D case) and its reflection coefficient were presented.Compared with the reflection coefficient of non-attenuating wave mu

Abstract:Experiments in compression and bending were done for 10 concrete columns and 5 steel columns with various ratios of axial compressive force to the axial compressive ultimate capacity of the section,and the influence formulae of the ratio of axial compress

Abstract:The Vlazov model was applied to study the dynamic response of beam under moving loads on elastic foundation.The analytical solution of the beam response was obtained by applying the Fourier integral transformation and the residue theorem,followed by a com

Abstract:Three dimensional coupled aseismatic dynamic analysis of typical single span structure system of Minghe large scale aqueduct in south-to-north water transfer project was carried out, based on the rational thinking of static load and mass coming from the n

Abstract:Based on the spatial model,a reliable and accurate calculation method for the shape-finding of self-anchored suspension bridge with spatial cables was studied.On the principle that the shape of the main cable between hangers is catenary,the iteration meth

Abstract:The inhalable particles concentration level is an important inference factor for indoor air quality(IAQ).To investigate the IAQ of under-floor air supply system,this paper analyzed the factors affecting the indoor inhalable particles concentration(IPC) an

Abstract:On the basis of realizing Electrolytic In-process Dressing(ELID) grinding at high speed by using enclosed electrode,this paper studied the mechanism of ELID grinding at high speed for Si3N4 ceramics.By contrasting with non-ELID grinding at high speed,this

Abstract:The problem of continuously dynamic output feedback stabilizing controllers for a class of networked control systems(NCS) was studied.We supposed that the network induced delay was random and less than the sampling period,the plan with a constant delay wa

Abstract:After analyzing the defects of the existing current measurements for transmission line,this paper presented a new method for extra high voltage system current measurement.The new method was based on V-A measurement,and the instrument based on the proposed

Abstract:为了降低开关磁阻(SR)电机的振动和噪声,建立了SR电机径向力计算的有限元(FE)模型,对各典型转子位置和相电流下的SR电机径向力分别进行有限元计算.基于有限元计算结果,应用三次样条插值进一步计算所有转子位置和相电流下的径向力,以保证径向力计算既有一定的精度又有良好的快速性,在此基础上,建立了电压PWM控制方式下SR电机调速系统仿真模型,对开通角、关断角优化组合以降低SR电机径向力及其他性能指标进行了仿真研究.结果表明:样机合适的开通角(θon)和(θoff)关断角分别为0°和22°左右.

Abstract:SiC particles reinforced aluminum alloy matrix composite preformances were prepared by a new Crucible Movable Spray Deposition equipment with a dualcircular atomizer.The capture mechanism and the characteristics of the particles were studied with experime

Abstract:The nano-silica was synthesized through microemulsion and was modified with poly amidoamine(PAMAM) as the co-monomer and the support.Then,the molecular imprinting polymer(MIP),which contained the PAMAM silica,was prepared in a micro suspension process,usi

Abstract:经希夫碱缩合反应,制得水杨醛亚胺配体(3),其Na盐与trans-NiClPh(PPh3)2合成了新型中性镍配合物4{[o-(3-Cyclopentenyl)-(5-Me)C6H2--oC(H)=N-2,6-(i-Pr)2C6H2]2CH2}[Ni(Ph3P)(Ph)]2.经Ni(COD)2活化,配合物4的最高活性达12.12×105gPE/(molNi.h),所得聚合物黏均相对分子质量在1.93×104~9.49×104之间.研究了不同聚合条件对催化性能的影响.配合物4可以作为单组分催化剂催化乙烯聚合,活性高达1.49×105gPE/(molNi.h),所得聚乙稀相对分子质量及其分布分别达到了5.27×104和3.34.

Abstract:Dynamic coagulation experiments and quiescent settling experiments were done by dissolving low concentration dissolvable organic material-anionic surfactants(Sodium Dodecyl Sulfate,SDS),and adding polyaluminium chloride (PAC) and a new water treatment che

Abstract:针对污水处理厂运行时故障数据不平衡性和代价敏感等特点,构造风险泛函RWLOO(α)来改进支持向量机(Support vector machine,SVM);并用遗传算法(GA)对风险泛函求全局最优.在GA对RWLOO(α)寻优过程中,SVM的几个参数以及核函数同时进行最优化.结果表明:用改进的SVM对污水处理厂的故障数据进行分类时,比未经改进的SVM错分类率低16.5%.

Abstract:Some new exact solitary wave solutions of an auxiliary ordinary differential equation were obtained by the trial method.By utilizing the auxiliary ordinary differential equation and its solutions,the first kind and second kind of KdV equation with variabl

Abstract:定义了一种新形式的格——闭格以及一种新的交结构——拓扑交结构,并证明闭格与有上界的拓扑交结构是一一对应的,闭半格与拓扑交结构也是一一对应的.从范畴的观点来看,闭格构成的范畴TL与有上界的拓扑交结构所构成的范畴TTS是范畴等价的;闭半格所构成的范畴TSL与拓扑交结构所构成的范畴TS也是范畴等价的.

Abstract:Based on RAROC loan pricing model,we propose and demonstrate the comparative advantage principle of the commercial bank loan pricing.Considering any two banks with their own fixed RAROC,we find that the commercial banks have the loan pricing comparative a

Abstract:There are lots of factors affecting modern rural logistics.Gray correlative degree analysis shows that,first,infrastructure construction plays a decisive role at the initial stage of rural logistics development;second,natural disaster is an important fact

Abstract:The large-scale vehicle routing problem was considered,and an integer programming mathematic model was proposed.The large-scale vehicle routing problem(VRP) was partitioned into two sub-problems: the generalized assignment problem and vehicle routing prob