Abstract:Some solid catalysts were prepared by supporting various active ingredients such as H~+,Ni~(2+),Fe~(3+),Mb~(2+),Al~(3+),M_x~(2+),Sn~(4+) on catalyst carriers,which included strong acidity cation exchange resin ,active alumina and active white soils. The

Abstract:This paper studied the process for synthesizing methyl N-methoxyl-N-2-methylphenylcarbamate from o-nitrotoluene by reduction,acetation and methylation. This paper also investigated the effects of different solvents and temperatures on the reducing reacti

Abstract:建立了多层喷射沉积制备管坯的雾化过程热流模型，并对耐热铝合金熔滴在雾化飞行过程中与雾化气流的动能和热能交换进行了计算和分析．计算结果表明：①小直径熔滴在飞行过程中的平均冷却速度较大，其凝固可以在较短时间内完成；②不同直径熔滴飞行过程中的平均冷却速度均随飞行距离的增加而减小；③在0～0．2m的雾化距离内，直径为10～220μm的耐热铝合金熔滴平均冷却速度可以达到10^4K／s以上．

Abstract:A novel patented technology, termed as solid-liquid reaction milling, was adopted to prepare the Fe-Zn and Fe-Sb nano-crystalline intermetallics powders. The effect of some elemental powders with the same composition as the milling medium on the reaction

Abstract:A two-dimension model for the flow field in catalytic converter was established, and the steady state flow was simulated with the computational fluid dynamics (CFD) code. Based on the model, the flow distribution and pressure loss in catalytic converters

Abstract:Based on the STEP standard and CORBA technique, the architecture of collaborative automobile design is proposed. The architecture contains four layers: data layer, communication layer, negotiation and management layer, and application layer. The data laye

Abstract:This paper discussed how to optimize the layout graphics, which were produced by the Auto-arranged system, by using the mutually optimized method. After analyzing the mutual optimization process, we provided a method which could reconstruct the nesting gr

Abstract:In the design of metric device of screw volume, a functional system graph was obtained through establishing transition between the scheme design and overall design in packaging machinery design, by using the methodology of functionalism, by deepening the

Abstract:在分析铸轧辊套传热特征的基础上，对铸轧辊套温度场进行了数学描述．根据铸轧辊套温度场的特点，运用Galerkin方法，实现了铸轧辊套温度场的近似解析求解．实例计算表明，所得结果与实测结果相吻合．对铝合金超常铸轧工况下的辊套温度场进行了仿真分析，结果表明：与常规铸轧相比，超常铸轧工况下的辊套内、外表面最大温差及外表面最大温差显著降低，且辊套温度分布趋向均匀化．

Abstract:Using the rotor d-q reference frame of the brushless doubly-fed machine(BDFM),a mathematical model for the power was derived, and the power control scheme was primary designed. Computer simulation showed that when the power winding acted as generator, the

Abstract:提出了用Volterra频域核(传递函数)作为故障特征对非线性定常动态网络进行故障诊断的方法，即计算出网络响应在各种常见故障状态下的Volterra级数解的各阶频域核(3～4阶即可)，并将其输入给BP神经网络(BPNN)．利用BPNN的分类功能建立故障字典，对实测的故障网络的各阶频域核进行测试样本分类，实现故障诊断．给出了各阶频域核的统一递推算式，并讨论了Volterra频域核的实验测量方法以及基于人工神经网络(ANN)的求解方法．

Abstract:This paper presented a method to reject and to calculate the mistake error of remote monitoring and management system for the transformer /low-voltage users, and designed a remote monitoring and management system based on the method. The paper also discu

Abstract:This paper proposed a complete set of laboratory direct shear experimental process and discussed its details about the rheological property of the soft clay, such as the loading method, the preservation of the test sample, the data acquisition and so on.

Abstract:The general calculation methods of time-dependent reliability were outlined. Based on some rational assumption and by using the direct integral method, an improved calculation formula was derived. Using the improved formula and the direct integral method,

Abstract:根据某移动通讯铁塔倒塌现场的破坏特征，采用通用的有限元程序对铁塔进行了受力性能分析计算；从塔上截取6根杆件进行了材性试验．试验及分析结果表明，不合理的截面设计和连接是该塔发生倒塌的主要原因．对铁塔设计提出了几点建议．

Abstract:考虑土和结构物的动力相互作用时，两者之间的接触状态必然对基础和结构反应产生影响．通过假定桩土接触面薄层单元本构关系特征，人为地在两种不同材料交界面上引入一种位移间断面，并采用有限元方法将其位移及刚度反应到桩土子结构中．文中给出了桩-土-上部结构动力有限元平衡方程．计算分析表明，考虑薄层单元接触效应与假定桩土位移一致协调条件下所得的动力反应结果是有一定差异的

Abstract:This paper introduced an intelligent encryption method for computer software. By using a 8-bit single-chip and a PCI bus structure, a hardware encryption card was devised, which was directly inserted in the bus. The encryption program was designed as an i

Abstract:Fair document exchange in real-time plays a key role in e-commerce activities nowadays. This paper presents a fair document exchange protocol that can achieve strong fairness in real-time. Based on RSA algorithm, the protocol is constructed by means of ce

Abstract:根据国内外绿地规划指标，结合岳阳市的实际，对岳阳市城市绿地规划指标体系进行了较详尽的研究．认为用城市人均公共绿地面积、城市绿地率和城市绿化覆盖率三项指标来衡量城市绿地系统建设，无法正确地反映出城市绿地系统建设的水平，也不能真实地反映出城市绿地的生态效益和绿化质量．因此城市绿地指标除原有的这三项指标外，还应包括生态、环境、景观、园林、分布的均匀度、植物结构、配置模式以及规划和管理等方面的内容．

Abstract:社会转型期中国城市中长期规划性质发生的根本变化，使生态城市指标体系面临种种不确定性因素的挑战．近年来国内外生态城市指标体系的相关研究在不断增加，但多半集中在城市确定性目标上，对不确定性因素考虑较少．本文分析了生态城市指标体系的不确定性特征，以及在制定过程的不同阶段，例如确定指标种类、域值以及贡献率量化等过程中可能遇到的不确定性，结合目前国内城市的现实情况，提出基于不确定性的生态城市指标体系的建构原则，特别是“弹性”原则，它包括“弹性范围”以及“时空性”两个特征．以长沙生态城市建设规划为例，采用层次分析法(AHP)等，选择操作性强、可量化的“弹性”要素构建该市生态城市指标体系．

Abstract:研究了一类M／PH／2排队的队长的几种遍历性．对于M／PH／2排队系统，其队长L(t)不是一个马氏过程．虽然它的嵌入链是一马氏链，但对于l-遍历、几何遍历、多项式一致遍历和强遍历成立的条件却不能借助于它的嵌入链而得到．利用服务相位J(t)，使得L(t),J(t)，t≥0}是一马氏链(且是一拟生灭过程)．Neuts解决了{L(t)，J(t)，t≥0}的(普通)遍历性问题．本文给定了M／PH／2队长的l-遍历、几何遍历、多项式一致遍历和强遍历行之有效的判别准则．

Abstract:讨论了二元生成Mǒbius子群(f，g)的离散性、初等性与三元数组(β(f)，β(g)，γ(f，g))的关系，得到了集合E的一些性质，给出了集合D∩E1的具体刻划，并利用代数方法证明了集合E和D∪E是C^3上的闭集．

Abstract:采用恒电流沉积法，在含有NdCl3的酸性镀液中获得了不同Nd含量的Fe-Nd-P合金镀层．利用电子显微分析、能谱分析研究了镀层的形貌及成分．测得从H3PO3镀液中获得Fe-Nd-P合金镀层中稀土元素Nd的质量分数高达71．51％．通过测试镀层的沉积速率，研究了水溶液电沉积Fe—Nd—P工艺中金属盐、络舍剂浓度、电流密度、镀液pH值、温度等对镀层沉积速率的影响，确定了最佳镀液配方及工艺条件．

Abstract:用玻色子1／N展开技术研究了6个钨同位素的能谱和约化电磁跃迁概率B(E2)．结果表明，展开式的高阶项十分重要，6个核的能级能量的理论值和实验值的方均根差，最大的是154keV，最小的只有11keV，符合得令人满意．而且理论能正确地符合实验方面跃迁概率的“回弯”现象．

Abstract:In some Multiple Degrees of Freedom (MDOF) vibration systems, the damping matrices of the systems are definitive, but the modes of the systems are not orthogonal with respect to the damping matrices. So this kind of matrices can not be converted into dia

Abstract:用规范形理论共轭算子法研究了含平方项非线性系统，获得了方程的稳态渐近解．然后用普适开折理论分析了含平方项非线性Duffing系统的分岔响应方程，分析了余维2分岔，得到了转迁集和分岔图．得到的结果与数值模拟结果相一致．

Abstract:This paper establishes two models, mean-CaR model and mean-UaR model, of continuous time for portfolios in Black-Scholes market and give their explicit solutions. By comparing this two models and mean-variance model, it is concluded that mean-CaR model i

Abstract:This paper derived a three-stage game model among hi-tech enterprises in R&D cooperation, R&D expenditures and product market competition, and pointed out whether or not hi-tech enterprises carried through their R&D cooperation was determined by their