几种石蒜属花卉观赏性状的灰色评价

以灰色关联度对14种石蒜属花卉的观赏性状进行了评价．结果表明石蒜(Lycoris radiata)的加权关联度Ri为最大(0．713 888)，即观赏效果最好，这与实际运用效果相符；其次是安徽石蒜(L．anhuiensis)，Ri=0．708 429；排在第三位的是长筒石蒜(L．longituba)，Ri=0.703032．其他由大到小次序为夏水仙(L.squamigera)、玫瑰石蒜(L．rosea)、陕西石蒜(L．shaanxiensis)、乳白石蒜(L．albiflora)、短蕊石蒜(L．caldwellii)、麦杆黄石蒜(L．straminea)、肉红石蒜(L．incornata)、中国石蒜(L．chinensis)、换锦花(L．sprengeri)、忽地笑(L．aurea)、江苏石蒜(L．houdyshelii)．从灰色关联度分析结果看，花形整齐、奇特(雄蕊长于花被片，花被片强烈皱缩反卷)，花色稀有和秋冬出叶的，灰色关联度大,14种石蒜均适合作地被，但以秋冬出叶、花葶较矮的种更为适宜，如石蒜、玫瑰石蒜、麦杆黄石蒜、江苏石蒜等。     

C-半群的拟Lie-Trotter乘积公式

讨论了Banach空间中两C-个半群T(t)t≥0，S(t)t≥0的拟Lie-Trotter乘积公式[T（t/n）S（t/n）]^n收敛的条件。     

Atomic-scale computer simulation for early precipitation process of Ni75Al10V15 alloy

The kinetic model for a ternary system is introduced based on the microscopic diffusion form of the phase-field equations for a binary alloy. The equation is solved in the reciprocal space. This model is used to investigate the early precipitation process of Ni75-Al10V15 by simulating the atomic pictures of the two ordered phases and calculating the order parameters of γ′(Ni3Al) phase. Simulation results show that the γ′ ordered phases precipitate from the disordered matrix by a non-classical nucleation mechanism, and the nonstoichiometric γ′ ordered phase appears first and then transforms into the stoichiometric one. Clusters of V atoms appear at the γ′ phase boundaries followed by the formation of the nonstoichiometric θ ordered phase. The farther the location from γ′ phase boundary is, the lower the order degree of θ phase is. There exist two kinds of DO22 ordered domains: a horizontal one and a vertical one, related to their adjacent γ′ phase boundaries. The model could describe the atomic ordering and composition clustering simultaneously, and any a priori assumption about the new phase structure and precipitation mechanism etc. is unnecessary.     

Comments on scaling effect of reciprocity in BRDF study

Reciprocity principle is a common theory in electromagnetics and optics. It is also one of the general principles of the radiation transformation theory. However, in many remote sensing studies, this principle cannot be always supported by experimental data, especially when the scaling effect of the remote sensing image pixel is considered. The debate over the issue of whether the reciprocity principle can be used as a fundamental standard in evaluating the effectiveness of remote sensing observations has lasted for years. Using geometrical optics model, Li and Wan proved the existence of the scaling effect in applying the reciprocity principle to a remote sensing image pixel in 1998. In 2002, Snyder challenged Li's proof, and attempted to prove that reciprocity principle is universally valid without any scale limitation. In this paper, we will argue with Snyder's theory and point out that Snyder's theory had neglected an important condition used in Li's proof and, as a result, drawn the wrong conclusion. Here we will restate Li's condition in his demonstration and offer a further proof to verify that reciprocity principle cannot be applied unconditionally to the study of bi-directional reflectance distribution function (BRDF) of land surfaces in field or satellite remote sensing observation scale.     

lonApollonian度量及其应用(英文)

利用变换和模给出了Apollonian度量的解析表达式 ,建立了Apollonian度量与双曲度量的联系 ,得到了拟圆的一个充分条件。最后 ,作为应用给出了著名的Koebe’s 14 定理的一个新证明     

目标数量折扣下的供应链协调分析

目前国内一些行业的公司在销售渠道中常用目标数量折扣的契约模式。本文通过一个两阶段一对一的供应链模型分析了在这种契约下供应链的协调性，以及它对供应链利润分配的影响。最后针对某品牌型号的手机进行了实证分析。     

基于努力程度的创业投资最优股权分配模型

主要围绕与创业投资有关的股权分配及激励兼容问题，将创业资本家努力因素引入收益函数，建立了在创业资本家和创业企业家均衡努力情况下的最优股权分配模型。通过分析得出了创业资本家在创业企业中所占股权是随其努力重要程度λ的变化同向变化的，而不是绝对地按投资阶段递增或递减的结论。文章还讨论了创业企业潜力、股票市场等因素对最优股权分配的影响。     

供应链间的横向竞争与并购效应

基于企业竞争模式逐渐转变为供应链间竞争模式的观点,研究了供应链间的横向竞争和并购效应,重点考察了以可观察与不可观察合约为主导的供应链间竞争模式,及其横向并购后的供应链与各个环节的利润和市场变化情况。这些研究为企业并购决策,以及并购后的供应链整合提供了理论基础和决策指导。     

多载波CDMA中的多用户判决反馈检测器

提出了基于多载波的最小均方误差(minimummean squarederror,MMSE)多用户判决反馈检测器(deci sion feedbackdetector,DFD)。MMSEDFD具有结构比较简单且性能优于线性多用户检测器(LMMSE)的特点。多载波系统相对于传统的单载波系统能够有效地消除频率选择性衰落。在多载波的合并上,采用了等增益合并(equalgaincombination,EGC)和最大比合并(maximalratecombination,MRC)方式。仿真表明,MC DS/CDMA系统中的MMSEDFDEGC接收机和MMSEDFDMRC接收机相对于LMMSE接收机可以提高系统性能,特别是MMSEDFDMRC接收机能够明显提高系统性能。     

改进遗传算法及其在背包问题中的应用

介绍了一种改进的遗传算法,给出了应用该算法的具体步骤。该算法通过使用二元染色体编码方式,利用基因处于不同状态的概率来表示等位基因,既使染色体具有了更多的信息量,又能够保证遗传算法的收敛性。通过旋转变换实现了染色体的进化,提高了算法的全局搜索能力和收敛速度。并利用组合优化中典型的背包问题对算法进行了验证,并和基本遗传算法的结果进行了比较,验证了算法的有效性