Abstract:To maximally decrease the effect of the springback on sheet stamping, a computation program for sheet stamping and the springback was developed by adopting the 2D-shell element put forward by Hughes and Liu, which is fit for nonlinear problems. Based on

Abstract:Based on the human head-neck anatomic structure,this paper presented a head-neck 3D finite element model,which consisted of skull, brain, cervical vertebra, disks, facet joints, ligaments, and muscles. The model has 17 758 nodes and 21 803 elements. The w

Abstract:In order to make the data processing results of the auto crash test system satisfy the requirement of the CMVDR 294 regulation, the key technology in the data processing was studied.First, the amplitude-frequency properties of the filter were simulated a

Abstract:The fracture of sheets is caused by the instability of loading. To determine whether materials are instable or not, Hill's totalized instability theory and Swift's diffusion instability theory, which are based on continuous mechanics, were applied to isot

Abstract:Based on UG Secondary Development, Windows XP System and Microsoft Visual Studio. NET, this paper developed a parameter design system for form tool according to its design theories. The system applied the methods of cutting the shape of work piece and cr

Abstract:This paper established a multi-degree vibration system model for a three-axis truck equipped with the equilibratory suspension system and the fully suspended cab. In order to employ the real mode superposition technique to perform the random vibration

Abstract:Genetic algorithm was applied to the comprehensive load modeling of the power system. To be specific, this paper used the 3-order induction motor as the comprehensive load model, the parameters to be identified as the unknown vector, and the square sum of

Abstract:A new approach for online measurement of fouling in condensers was proposed. In this approach, the condensation pressure was chosen to reflect the state of fouling, and fuzzy modeling was applied to separate the influences of the fouling and off-design co

Abstract:Through the combination of recursive formulas of Volterra Series and Block-Pulse Function Tranform (BPFT), a new method of hybrid model identification was proposed for a class of nonlinear dynamic networks, and the corresponding expressions and the soluti

Abstract:Constant-ductility strength demand spectrum is often applied to the construction of structural demand curve. The difference in the conception and calculation of constant-ductility strength demand spectrum and constant-strength ductility demand spectrum wa

Abstract:The current capillary simulation models usually have a contradiction between simulation accuracy and simulation speed. After analyzing the current models, a simplified model was developed by applying the non-linear analysis capacity of artificial neural n

Abstract:Based on the finite-deformation theory of continuum mechanics, the stiffness matrix of steel space frame was derived. And by using Kishi-Chen power model to describe the nonlinear behavior of semi-rigid connections, the stiffness matrix for semi-rigid spa

Abstract:To solve the problem of the settlement of high rock-filled embankments during and after construction for the roads in Southwest China, the settlement of subgrade was calculated by considering the nonlinear character of the subgrade under high stone fill

Abstract:The finite element method was employed to automatically produce shear bands in reinforced slopes and to simulate the progressive failure, and the calculation results agreed well with the observations in direct shear tests on reinforced soil and centrifuge

Abstract:This paper studied the behavior of lightweight steel-concrete composite beams subjected to standard fire. The finite element method was applied to calculate the temperature field of lightweight steel-concrete composite beams. By using a numeric method, th

Abstract:通过小试，研究了氧化沟膜生物反应器对城市污水的处理效果与运行特性．结果表明，在水力停留时间(HRT)为4h，曝气/停曝时间为90min／30min等试验条件下，氧化沟膜生物反应器对城市污水中的DOC，CODc，，NH4-N，T—N和T—P等的平均去除率分别达到75％，90％，95％，80％和50％；氧化沟膜生物反应器具有较强的抗冲击负荷能力，当进水CODCr由265mg／L增加到1000mg／L时，出水CODCr仍能维持在100mg／L以下；在停运30d后，这种膜生物反应器去除有机物的性能在2d内可恢复，去除氨氮的性能在8d内可恢复；在3种膜清洗方法中，化学清洗效果最好，水力清洗效果次之，曝气清洗效果最差．

Abstract:在优化卷烟烟气试样前处理技术的基础上，采用毛细管气相色谱分离一质谱检测一选择离子监测模式方法(GC/MS SIM)建立了一种同时测定卷烟烟气中15种多环芳烃的分析方法．各多环芳烃在20～1000μg／L范围内有线性关系，且苯并[k]荧蒽的最低检测限达到0．32μg／L，远低于文献值．并利用该方法对国产卷烟样品进行了分析．

Abstract:A mathematical model for determining the breakthrough curves of acetone adsorption on fixed bed was presented. Firstly,the breakthrough curves that Acetone passed through the activated carbon bed and took on different consistency of the influent sample

Abstract:The effects of the technological parameters of evaporation on the metal evaporation rate, the yield rate,the mean size and the particle morphologies of powders were investigated with a self-designed ultrafine powder collector, which used induction curre

Abstract:In order to reduce the production cost, a self-propagating high temperature synthesis ( SHS) technique was used to prepare the cathode materials of solid oxide fuel cells(SOFC). Four kinds of SHS reaction systems and nine reaction formulas were studied to

Abstract:Selective laser sintering (SLS) processing parameters affect the density of the sintered parts, which affects the strength of the sintered parts. This paper presented a prediction model for the relationship between the processing parameters and the part d

Abstract:By means of the sandwich model, this paper established the nonlinear equations of the creep buckling for a compressed column with two-end movable hinge and initial imperfection. These equations involved only time function and could be easily solved appro

Abstract:Based on the Call Process Model made by Use Case Map, a Non-Deterministic Feature Interaction Filtering Method for intelligent networks was presented. To overcome the two shortcomings of the filtering method presented by Nakamura, which involves excessive

Abstract:Based on the Minimum Output Energy (MOE) multiuser detection, this paper proposed an improved space-time multiuser detection algorithm by combining the subspace decomposition. Comparisons were performed between the output Signal Noise Ratio (SNR) of the

Abstract:This paper put forward a trust management prototype based on the generalized transitive closure. In the model, we obtained the trust evaluation according to the evaluated value of trust relationship and trust experience, then used it to compute trust by c

Abstract:就给定的整数s1，s2，…,sk，1≤s1≤s2≤…≤sk，给出了一种简单的方法来计算Cn^21,s2,…,sk中生成树个数的渐近性质，证明了该渐近性可以归结为求解一个次数为2sk-2的多项式，并将这种计算方法应用到若干个循环图作为例子．

Abstract:Matlab is a powerful computer software and has found wide application in automation control, mechanical, electrical and civil engineering and economic management. This paper proposed a generalized assignment problem, and proved the theorem that the optima

Abstract:证券市场上收益率分布存在严重的偏峰厚尾现象；同时风险价值方法本身不符合次可加性．这使得进行组合优化时它的局部最优解并非全局最优．针对这些问题，我们从一致性风险度量理论出发，提出了一种新的风险度量技术——一致性风险价值——来度量投资组合的信用风险，在此基础上建立了一致性风险价值的投资组合优化模型，并运用线性规划技术进行组合优化．最后我们通过实证研究，发现运用基于一致性风险价值的优化模型进行投资组合的结果，优于运用基于风险价值的优化模型．