On a New Lower Order Exact Penalty Function

For the inequality constrained nonlinear programming problem, the antnors propose a new lower order penalty function, which combines the classical l1 penalty function and the lower order exact penalty function introduced in thoy some papers, and then illustrate that it has the merits of the two penalty functions. In additional, we propose a solution method for solving the inequality constrained nonlinear programming problem and prove its global convergence.     

遥感区域大小对森林蓄积估测影响规律的研究

该文将 1幅TM遥感图像分别分成 1 4及 1 2幅 ,通过实例分析了 1 4,1 2及整幅TM图像所能达到的几何精校正精度 .然后 ,以样地对应的遥感和GIS信息为影响森林蓄积估测的变量 ,采用最小二乘原理及岭迹分析 ,研究了上述 3种不同面积幅值图像对应林区影响森林蓄积估测的主要变量 .由 3种不同面积遥感区域蓄积估测方程中所含变量的个数、种类及预报精度 ,详细分析了遥感区域大小对蓄积估测的影响规律     

云顶山草本植物功能群研究

植物功能群是植被生态学研究的重要领域之一。通过对植物功能群的研究有助于揭示植物群落的结构和功能,了解植物群落的物种多样性、功能多样性、谱系多样性和演替规律,同时,可为植被恢复和重建提供科学依据。根据野外样方的调查资料,采用Fisher精确检验和Spearman秩相关系数检验,并结合聚类分析对山西云顶山自然保护区草本植物优势种的植物功能群进行了研究。结果表明:1)Fisher's精确检验结果表明,有46个种对正关联极显著(P＜0.01),有5个种对负关联极显著(P＜0.01);有24种对正关联显著(P＜0.05),有10个种对负关联显著(P＜0.05);有996个种对关联不显著(P>0.05)。2)Spearman秩相关系数检验有72个种对正相关极显著(P＜0.01),有9个种对负相关极显著(P＜0.01);有33种对正关联显著(P＜0.05),有8个种对负关联显著(P＜0.05);有959个种对相关不显著(P>0.05)。3)经Fisher精确检验关联不显著(P>0.05)的种对(996)占总种对的92.14%,而经Spearman秩相关系数检验相关不显著(P>0.05)的种对(959)占总种对的88.71%,这意味着草本植物优势种间的生态位存在较为明显的分化。4)综合Fisher精确检验和Spearman秩相关系和聚类分析的结果,将云顶山自然保护区草本植物划分为5个功能群:亚高山草甸植物功能群、中山草丛植物功能群、低山草丛植物功能群、森林和灌丛植物功能群和森林植物功能群。云顶山植物功能群与植物群落类型、生境、植物生活型和生态位等有密切关系。      

刍议中职艺术设计教改

新世纪人才的竞争和挑战,对艺术设计职业教育提出了前所未有的新要求,要使艺术设计专业教育与时代同步,转变教育观念,准确专业定位势在必行,优化课程体系,培养创新人才,是艺术设计专业生存和发展的基础和前题。     

Exact Integration of Constant Element of Elastomer in Boundary Element Method

The boundary integral in Boundary Element Method affects the precision and the speed of the method. If the boundary integral with constant element, the nonsingular integrals are popularly calculated by the Gauss numerical integral, and the singular integrals are popularly calculated by the analytical integral. This paper presents an alternative way with Gauss formula to transform the double integral in elastic problem on 3-d into the linear integrals on the boundary of each subdomains, so that all the singular integrals and nonsingular integrals are calculated by analytical method. The example indicates that this method makes the precision and the speed of BEM improve.     

精确罚函数求解约束优化问题的布鲁丹族拟牛顿算法

对于含约束不等式的优化问题,构造双参数精确罚函数并给出精确罚定理,提出了一个求解这种罚函数问题的布鲁丹族拟牛顿算法,研究了算法的收敛性与收敛速度,并进行了数值试验,证明了可行性.     

一类无散射偏微分方程组的变换和精确解

将3个非线性物理方程组通过近似约化，转化为一类无散射的偏微分方程组，然后通过变换，化为一阶拟线性双曲型方程。利用拟线性双曲型方程的解，得到无散射偏微分方程组的精确解。参6     

带锯制材工艺优化设计问题研究

针对目前带锯制材工艺设计中存在的几个问题进行分析和研究，合理地解决了制材工艺设计中下锯锯口数量、锯口分配、贮存台大小计算和运输设备运行速度计算等问题，并对工艺方案的评价和优选进行了探讨。     

Evidence of non-site-specific agricultural management effects on the score of visual soil quality indicators

This study investigates 11 agricultural management practices (AMPs) and their effects on seven visual soil quality indicators and soil aggregate stability. The survey carried out across eight pedoclimatic zones in Europe and China was based on visual soil assessments (New Zealand VSA method) performed on soils subject to different soil management practices and nearby similar soils, under similar farming features, without the distinctive soil management practice (control). Fisher's exact test was used to test if the management treatment was independent of the score of each visual soil quality indicator and to test if the management treatment produced a higher frequency of the score ‘good’. The results showed a statistically significant (α < .05) higher frequency of the score ‘good’ for ‘soil structure and consistency’ and/or ‘soil porosity’ for six AMPs. For no-till AMP, the null hypothesis can also be rejected for ‘susceptibility to erosion’ and ‘soil stability’ and for ‘mulching + permanent soil cover’ AMP, for the ‘presence of tillage pan’ and ‘soil colour’. The hypothesis that the management treatment was independent of the score of each indicator was rejected for ‘soil structure and consistency’ of three AMPs, for ‘soil porosity’ of three AMPs, for ‘soil colour’ of one AMP and for the ‘presence of tillage pan’ of one AMP. This study demonstrates that farming systems sharing a common influential soil management practice at different locations and with different soil types significantly affect the score of some visual soil quality indicators.