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Abstract: Simulated annealing and multigroup parallel evolution are two helpful methods which can improve the performance of genetic algorithm.These two ideas are well combined in this paper,and a new algorithm is derived,that is the multigroup parallel g
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文摘:模拟退火和多种群并行遗传进化是两种较好的改进遗传算法性能的方法.将这两种思想有机地结合起来,提出了一种基于模拟退火机制的多种群并行遗传算法.仿真结果表明,该算法不仅能增强算法的全局收敛性,还能加快遗传进化速度,得到满意的全局最优值. |
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Abstract: Since 1996, In ZF Friedrichshafen AG, Environmental management system based on the international standard ISO14001 have been installed.
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文摘:自1996年起，在ZF，建立在ISO14001基础上的环境管理系统已经完成。 |
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Abstract: Since commercial function is a mainstay of modern urban development, the overall conception of commerce reconstruction should be outlined through the characteristics and trend of urban development, then seeking the countermeasure on the basis of
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摘要：商业功能是现代都市发展中的一个重要支撑因素，为此，就需要从都市发展的特征与趋势中去勾勒商业功能再造的整体构想，并在商业功能再造条件的基础上去探寻对策路径。 |
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Abstract: Since lake eutrophication was first taken into consideration, scientists had managed to simulate the appearance of lake eutrophication, predict the response of lakes to different management through mathematical models, thereby determining the pr
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文摘:自从湖泊富营养化引起人类注意以来，科学家们就设法通过使用数学模型来模拟湖泊富营养化的发生，预测湖泊对不同管理措施的响应，以便找出合理的治理措施。 |
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Abstract: Since piezoelectric resonant filter can not effectively prohibit higher-frequency harmonic,the mechanism of this problem has been discussed by means of a specific example which shows that there exists lots of undesirable resonant frequencies of
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文摘:提出压电谐振滤波器不能很好地滤除高频谐波的问题,结合一个具体例子理论推导了压电谐振滤波器存在许多干扰谐振频率,从而不能有效滤除一些特定频率的干扰信号.为了解决这个问题,提出一种改进型的静电激励谐振滤波器.为了说明其可行性,具体分析了改进型双端固支微梁静电激励谐振滤波器,理论推导证实基于双端固支微梁的各阶振型正交的原理,通过适当调整激振电容的间距,双端固支微梁的高阶振动模态受到很好的抑制,因此这种谐振滤波器可以有效阻止滤波器中心频率的高频谐波的通过. |
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Abstract: Since the 20th century, a great progress has been made in research on infiltration and runoff yield.
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文摘:20世纪以来，入渗与产流研究取得了长足进展。 |
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Abstract: Six compounds were isolated from the whole herb of Phyllanthus urinaria L..On the basis of physical and chemical properties and spectra data,they were identified as ethyl brevifolincarboxylate(1),brevifolin(2)，corilagin(3)，protocatechuic acid(4)
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文摘:从叶下珠中分离得到6个化合物，根据理化数据和光谱方法鉴定为短叶苏木酚酸乙酯(1)、短叶苏木酚(2)、柯里拉京(3)、原儿茶酸(4)、没食子酸(5)和鞣花酸(6).其中(1)、(3)、(4)为本种植物中首次分离.根据2D-NMR修正了文献中化合物(1)和(2)的部分碳信号归属错误，归属了化合物(3)的碳氢谱数据. |
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Abstract: Six quasi-ternary liquid-liquid equilibria systems between benzene, toluene, p-xylene, n-heptane, methyl-cyclohexane and N-formylmorpholine(NFM)+water have been determined at normal pressure and 60 ℃; the conjugate phase compositions and the con
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文摘:用液液平衡釜测定了常压，60℃下加水N-甲酰吗啉和苯、甲苯、对二甲苯、正庚烷、甲基环己烷组分间6个拟三元体系的液液平衡，得到了拟三元液液平衡体系的共轭相组成和分配曲线；实验数据用UNIQUAC和NRTL模型进行了关联；用共轭相作图拟合法和模型参数推算法获得了各体系的褶点数据；并求得了溶剂对溶质的选择性和分配系数。 |
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Abstract: So far as market economic countries are concerned, negotiable securities marke t has two main functions: the fusion of enterprise capital and better dispositio n in resources.
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文摘:对市场经济国家而言，证券市场主要有两个功能：企业融资和优化资源配置。 |
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Abstract: Software reusability and workspace management are two key factors for the large scale scientific computations and application development.Workspace management framework system is based on an object-oriented hierarchical model and provides applic
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文摘:大型科学计算领域需要良好的应用开发和管理环境，以提高应用组件可复用性为目标，规范应用软件开发过程和计算工作流程.科学计算工作空间管理框架将应用组件作为基本对象，对其进行层次式管理，同时为应用组件开发过程提供有效的管理工具、可复用的应用框架以及基于可视语言的工作流编辑服务.它的可直接操纵的参数界面，基于对象的应用组件管理模式和数据流驱动的任务调度机制使其具有鲜明的特点. |
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Abstract: Soil and water conservation in suburbs has different purposes and its benefits vary with its purposes.
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文摘:由于城郊水土保持目的的多样性，其水土保持效益分析也存在着复杂性。 |
