Higher-order duality for a class of nondifferentiable multiobjective programming problems involving generalized type I and related functions

This paper extends the class of generalized type I functions introduced by Aghezzaf and Hachimi(2000) to the context of higher-order case and formulate a number of higher-order duals to a non-differentiable multi-objective programming problem and establishes higher-order duality results under the higher-order generalized type I functions introduced in the present paper. A special case that appears repeatedly in the literature is that the support function is the square root of a positive semi-definite quadratic form. This and other special cases can be readily generated from these results.     

现代城市公共空间的发展趋势

城市公共空间是城市的精髓所在，一个城市最主要的特质就是通过城市公共空间来表现的。城市公共空间的发展趋势代表着城市的发展趋势，因此研究城市公共空间的发展具有重要意义。现代城市公共空间的发展趋势是与现代城市发展息息相关的，它具体表现出大众化、生态化、立体化、室内化、综合化等主要趋势。     

玻璃化转变的分子串模型中分子串弛豫动力学的计算机模拟

基于玻璃化转变的分子串模型的分子串哈密顿量(Hamiltonian),提出了模拟分子串的弛豫动力学的蒙特卡罗(Monte Carlo)模拟方案.模拟得出的直分子串的弛豫时间,与分子串模型的弛豫方程所预言的第一弛豫模式的弛豫时间完全一致,即理论预期和模拟结果相互印证.这不仅说明分子串模型的分子串弛豫方程至少是第一弛豫模式的理论预言的正确性,同时也说明本文所提出的模拟方法的正确性,并进一步明晰了分子串中分子的随机涨落和跃迁运动的图像,也为三态甚至是多态的分子串弛豫动力学研究,以及对进一步模拟分子串之间的复杂相互作用提供了依据与思路.     

Bi0.04Sr0.94TiO3铁电陶瓷的合成与变温介电谱研究

采用固相反应一次烧结成型的方法制备了Bi0.04Sr0.94TiO3弛豫铁电陶瓷,着重研究了烧结条件对陶瓷的外形和介电性能的影响.结果表明,适当的压力和粉末湿度能促进样品压制成型,较慢的升降温速率有利于样品受热均匀,优化陶瓷的外形,改善微观结构.变温低频介电谱测量分析表明,所合成的Bi0.04Sr0.94TiO3陶瓷样品的主相的确是弛豫铁电相,而且性能稳定.     

数字绘画情景下的装饰纹样元素运用

中国传统文化渊源流长,古人在很早的时候就开始记载了图形图象.由写实的、生动的、多样化的动植物形象转化为抽象的、符号的、规范化的几何纹饰.文章是对数字绘画的图象含义进行深入了解,以及结合传统图形装饰纹样的形式与现代信息符号设计之间的关系探讨.重点在探寻数字绘画和传统装饰纹样、现代图形、图象形式美感之间关系的协调;形式美服从内容美,同时又具有相对独立性的价值.     

带分布时滞具有阶段结构捕食系统全局渐近性质

讨论了二种群的捕食与被捕食数学模型.首先给出解的存在及惟一性,再用上下解方法研究耦合半线性抛物方程组的动力学行为,并给出了解的全局渐近性质.     

BP网络技术在液滴粒度分布中的应用研究

将ＢＰ网络技术应用到液滴粒度的测量当中，实现了ｈ（Ｓ）与ｆ（Ｄ）之间的映射关系，从而提高了测量精度，并做到了实时测量。     

柑桔病叶片中叶绿体的超微结构

柑桔感染炭疽病后叶片细胞叶绿体结构被破坏，片层系统解体，消失，只剩下嗜锇颗粒和淀粉粒。     

Genome-wide patterns of genetic variation among elite maize inbred lines

We have resequenced a group of six elite maize inbred lines, including the parents of the most productive commercial hybrid in China. This effort uncovered more than 1,000,000 SNPs, 30,000 indel polymorphisms and 101 low-sequence-diversity chromosomal intervals in the maize genome. We also identified several hundred complete genes that show presence/absence variation among these resequenced lines. We discuss the potential roles of complementation of presence/absence variations and other deleterious mutations in contributing to heterosis. High-density SNP and indel polymorphism markers reported here are expected to be a valuable resource for future genetic studies and the molecular breeding of this important crop.     

Copula-based risk management models for multivariable RMB exchange rate in the process of RMB internationalization

This paper investigates the dependence of the exchange rate of onshore Renminbi (RMB) and offshore RMB against US dollar (i.e., CNY and CNH) based on copula models. Eleven different copulas were selected to construct multivariate distribution and estimate the value-at-risk for RMB exchange rate. Empirical results show that time-invariant Student-t copula is the best model to fit the sample data. The positive upper and lower dependence indicates that CNY and CNH series tend to move in the same direction. Moreover, the dependence between the two exchange rates is asymmetric, which means that traditional models, such as Pearson’s correlation, are inappropriate to measure the correlations between these markets. The best fitted model is chosen to estimate the financial risk, which can help business practitioners and policymakers track risk evolution and make good decisions.