Abstract:Based on Hamilton's law of variation principle,the high accuracy incompatible formulation of finite dynamic element that increased internal degree of freedom was established.The relationship between the derived formulation and the conventional finite dyna

Abstract:采用非线性连续介质力学的有限变形理论和内力屈服面塑性流动理论,对空间钢框架结构体系进行了二阶弹塑性稳定极限承载力分析,同时分析了主弯曲、非对称水平荷载对空间钢框架极限承载力的影响.经算例分析得知:如果非对称水平荷载比在0.5~2.0之间,则水平荷载的非对称性对结构的极限承载力影响很小;主弯曲对钢框架整体极限承载力的影响随结构层数的增加而减小.

Abstract:The toughness of steel decreases as temperature drops,its breakage transfers from plasticity to brittleness and the loading capacity is controlled by the toughness,not the strength.This paper experimented with the fracture behavior of steel structures at

Abstract:Red stratum rock mass is a familiar rock mass in rock engineering.It always contains clay mine,for example,kaolinite,montmorilonite and illite.One main character of red stratum rock mass is the rock mass swelling and collapse after clay mine absorbs water

Abstract:This paper discussed the Reissner's plates on elastic foundation.The elastic foundation model was considered as Vlazov's two-parameter elastic foundation model and its effect on medium-thick plates were taken into account with a set of governing different

Abstract:A new potential analysis index,Pressure Differences Pascal Hours for natural ventilation(PDPH),was proposed and a new model of NVP in residential buildings was developed.With this model and the weather data of Typical Meteorological Year in Guangzhou city

Abstract:A dynamic mathematical model of an air source heat pump water chiller/heater(ASHPWCH) under frosting was developed by connecting several of its component models according to principles of mass,momentum and energy conservation.The performances such as air

Abstract:Based on Bernoulli equation,the mechanism of solid-fluid interaction was analyzed,and the free vibration equations of solid-fluid interaction rectangular containers with elastic bottoms were established.The free vibrations of the system were disposed as o

Abstract:Based on the perturbation theory,it was proved that the change of frequencies was due to the function of structure damage location and damage levels. The formula of damage location was obtained with some function transformation.The formula obtained was si

Abstract:Based on the multi-body pedestrian model with advanced knee structure developed by Prof.Yang J.K.,which has been proved to have a good biofidelity,a car-pedestrian impact simulation model was developed.By changing the structure,such as bumper and hood,the

Abstract:Based on the process test of high speed grinding,this paper analysed the influence of various process parameters,such as wheel speed,wheel depth of cut,and workpiece velocity on the grinding force,surface roughness and the rate of material removal,and rev

Abstract:The stability of high-speed vehicle under side wind is directly connected with the safety of vehicle and passengers.In order to analyze the impact of side wind upon vehicle,A 3-DOF nonlinear vehicle dynamic model considering side wind was established.A Mo

Abstract:Contactless mobile power is a device which supplies electrical power for moving equipments or other equipments with some special requirements for electrical power.Some useful ways to improve the efficiency of power transmission were studied.A circuit topo

Abstract:Based on the analysis of three special wavelets,we constructed new circuits to implement the special continuous wavelet transform(CWT) both in time domain and frequency domain.We realized the system of CWT with the share constructs by using the new design

Abstract:传统的或改进型的中值滤波器,很难在图像噪声滤除和细节保留两方面兼顾与平衡.本文基于粗神经元构建了一种粗集神经网络,该粗集神经网络对5×5中值滤波器和多级FIR中值混合滤波器MFMHF(Multilevel FIR-Median Hybrid Filter)的处理结果进行融合.由于粗神经元的不可微性,BP算法不再适用,因此本文采用遗传算法GA来进行网络权值的学习,同时融入具有局部搜索能力的爬山法改善了进化后期的计算效率.仿真试验表明,粗集神经网络在图像融合滤波方面的性能优于BP网络和一般的中值滤波器.

Abstract:With in mind the inverse model identification problems in inverse system method,this paper studied the realization of inverse system identification and control using support vector machines(SVM),and proposed a compound control strategy combing SVM inverse

Abstract:In order to improve the therapeutic efficacy of retinoid carboxylic acids,a symmetric type of methylene diester was designed and synthesized by coupling two molecular retinoid carboxylic acids with one molecular dibromomethane.The synthetic procedure and

Abstract:利用微波等离子体沉膜技术和溶胶-凝胶法在载玻片上制备同时掺Fe3 和N的TiO2膜,经500℃焙烧后所得光催化剂性能较好.分别以紫外和可见光为光源,光催化降解茜素红,结果发现:掺铁量均为0.1%的Fe-N/TiO2较Fe/TiO2的光催化活性好,而且可见光的利用率明显增强;UV-Vis扫描显示掺铁0.1%的Fe-N/TiO2紫外吸收峰较其他TiO2光催化剂强且明显红移.XRD谱图结果表明,分别在500℃和550℃焙烧后的0.1?-N/TiO2,均为锐钛矿型,晶体粒度分别为15.3 nm和20.6 nm,XPS谱图显示Fe-N/TiO2有N1s谱峰.

Abstract:(α-氟-α-乙氧羰基)甲基膦酸二乙酯在正丁基锂作用下,生成二乙氧膦酰基和乙氧羰基稳定的碳负离子;该碳负离子对全氟酸酐进行亲核取代反应得到全氟酰基膦酸酯;不需分离,直接用不同的Grignard试剂进攻原位产生的全氟酰基膦酸酯,立体选择性地合成以Z-式或E-式为主的β-全氟烷基-α-氟-α,β-不饱和酸酯,总产率为43%~80%.

Abstract:从自制的SiO2和SiC涂层/三维碳纤维编织体出发,采用溶胶浸渍-原位分解法得到三维碳纤维编织体/涂层/Al2O3陶瓷复合材料.采用等温氧化失重、XRD、SEM、电子拉伸试验等测试手段研究了涂层对碳纤维编织体抗氧化性、复合材料力学性能的影响及复合材料的强韧化机理.结果表明:涂层可明显提高碳纤维编织体的抗氧化性能;梯度SiC涂层可明显改善纤维与陶瓷颗粒的界面结合性能,使复合材料的强度、断裂韧性和弹性模量分别增加5~10倍,材料的断裂呈层间紧密的复合断裂;裂纹扩展和断口分析表明,复合材料的强韧化机理为Cf的拔出、桥接和诱导裂纹偏转.

Abstract:研究了Mn部分替代DyFe11Ti中的Fe对化合物结构和磁性的影响.利用真空电弧熔炼和真空热处理制备了DyFe11-xMnxTi(1.0≤x≤5.0)化合物样品.X-射线衍射和热磁曲线测量表明:用Mn部分取代DyFe11 Ti中的Fe仍保持ThMn12型结构,且具有较好的单相性;晶格常数a和单胞体积V随Mn含量的增加而增大;在DyFe7Mn4Ti化合物的热磁曲线上观察到了补偿点;随着Mn含量的增加,化合物在4.4 K温度下的饱和磁化强度逐渐减小,在某一成分点为零.而后随Mn含量的继续增加而增大.

Abstract:通过力学性能测试、金相和透射电镜观察等手段研究了热挤压态Cu-0.12Al2O3弥散强化铜合金的组织与性能.结果表明:挤压态Cu-Al2O3弥散强化铜合金的主要强化机制是细晶强化和弥散强化.细小的Al2O3相钉扎位错,强烈抑制基体的再结晶,造成材料小晶粒、多晶界效应,其平均亚晶粒大小仅为2~4μm.同时对不同强制机制对合金强度的贡献进行了定量计算,计算值与实验值吻合较好.

Abstract:Al-Cu-Ni ternary alloy powders were fabricated with a new solid-liquid reaction milling technology.Al_7Cu_4Ni powder were obtained by milling w_(Al)33.2%w_(Cu)(mass friction)eutectic alloy melt at 893 K for 12 or 24 hours,and Al_7Cu_4Ni powder were also p

Abstract:Uncertainties in urban ecological planning mainly result from the following aspects: uncertainty in the planning process and uncertainty in decisionmaking and analysis.To decrease the uncertainties in urban ecosystem,the following theories and methodologi

Abstract:Under the same extractable conditions,EDTA,HNO_3 and CaCl_2 were used as the extractants to remove Pb,Zn and Cd from the tailing soils.The distribution of Pb,Zn and Cd were determined using the optimized BCR sequential extraction procedures before and aft

Abstract:This paper proposed a new partition testing method based on execution profiles filtering.It startd with a large universe of executions filtered to find subsets,which consisted of unusual failure-causing execution behaviors.These executions were then repla

Abstract:Fair exchange is the basis of security in electronic commerce. This paper first analyzed a fair exchange protocol based on certificate authentication mechanism. We showed that there was an operational error of cryptographic algorithm when devising this pr

Abstract:A multimodality medical image registration method based on hybrid optimization algorithm was proposed to solve the problem of the mutual information function containing many local maxima.When dealing with multimodality medical images,we investigated the b

Abstract:According to the characteristics that two-word words are abundant in Chinese,this paper put forward a new dictionary mechanism,which added two-word-bitmap into the data structure.The speed of word segmentation can be improved by using this two-word-bitmap

Abstract:This paper introduced a method based on spectral analysis.With the basic message of data packet transmitted from the router gathered by the NetFlow in cisco equipment as a sample,the orders of the time series models have been determined with the sample au

Abstract:Based on the properties of bisymmetric matrices,a class of constrained inverse eigenproblem and associated approximation problem for bisymmetric matrices were essentially decomposed into the same kind of subproblems for real symmetric matrices with smalle

Abstract:The maximal multilinar commutator generated by the Bochner-Riesz operator and the BMO functions were introduced,and the weighted boundedness for the commutator on the Hardy type spaces were obtained by using the atomic decompositions.

Abstract:This paper introduced the concept of right stable,which generalized the concept of S-prine.We verified that the S-right stable elements in quantales were exactly the S-prine elements under some given conditions.Meanwhile,we studied some properties of subq

Abstract:In normal conditions,there is a consistency between individual's effectiveness and his work performances,and the individual performs best only when his effectiveness,which is closely related to his reward,has been utilized to the maximum.Due to the charac

Abstract: