Incomplete split plot designs

We propose an incomplete split plot design where levels of one factor (say A) are applied to the wholeplots and levels of the other (say B) to subplots, and where the number of subplots in each wholeplot may be less than the number of levels of factor B.The t levels of factor A are arranged in a completely randomized design. The s levels of factor B are arranged in a connected and proper incomplete block design within each level of factor A, by considering the wholeplots as blocks.     

Phylogenetic Diversity Over an Abelian Group

There is a natural way to associate to any tree T with leaf set X, and with edges weighted by elements from an abelian group G, a map from the power set of X into G—simply add the elements on the edges that connect the leaves in that subset. This map has been well-studied in the case where G has no elements of order 2 (particularly when G is the additive group of real numbers) and, for this setting, subsets of leaves of size two play a crucial role. However, the existence and uniqueness results in that setting do not extend to arbitrary abelian groups. We study this more general problem here, and by working instead with both, pairs and triples of leaves, we obtain analogous existence and uniqueness results. Some particular results for elementary abelian 2-groups are also described. Received July 13, 2005     

回载可分的闭环供应链配送中的多车辆运输策略

本文从车辆路径的角度研究了具有一个配送中心、多台车辆结合前向物流配送和逆向物流回载的闭环供应链运输策略,考虑回收产品的不同形态和可分批运输的特点,引入库存限制和成本惩罚,建立并分析了问题的数学模型．通过引入参数2σ原则构造了先分组后组内运用基于TSP的插入算法进行优化调整的启发式求解方法．算例分析表明该策略是合理有效的．     

二维负磁导率材料中的缺陷效应

研究了以金属铜六边形开口谐振环为基元的二维负磁导率材料的缺陷效应.利用电路板刻蚀 技术制备了二维负磁导率材料样品.采用波导法测量了点缺陷和线缺陷对二维负磁导率材料X 波段(8—12GHz)微波透射行为的影响.实验发现，无缺陷的二维负磁导率材料样品存在一个 谐振频率，在稍大于该谐振频率的极窄区域内表现为负磁导率.点缺陷和线缺陷SRR的引入导 致材料主谐振峰的强度下降、谐振频率发生移动，品质因数Q显著下降.缺陷的存在破坏 了材料的周期性结构，从而引起其谐振峰的谐振强度和谐振频率发生变化.缺陷效应的研究 不 关键词： 负磁导率 缺陷效应 开口谐振环     

Facets of Descent, II

Methods of internal-category theory are applied to show that the split epimorphisms in a category C are exactly the morphisms which are effective for descent with respect to any fibration over C (or to any C-indexed category). In the same context, composition-cancellation rules for effective descent morphisms are established and being applied to (suitably defined) locally-split epimorphisms.     

叶绿素丙酮溶液中热致暗空间光孤子实验

设计了热致暗空间光孤子的实验光路和偶边界条件的实施方案，在叶绿素丙酮溶液中实现了热致暗空间光孤子实验，并采用分步傅里叶变换法进行了数值模拟，发现两者的结果一致。     

一维负磁导率材料中的缺陷效应

理论和实验已经表明，金属开口谐振环（split ring resonators,简称SRR）可以实现材料的有效磁导率μeff在某一频率范围内为负.采用波导法实验研究了不同几何尺寸的六边形SRR在X波段微波作用下的近邻相互作用.实验发现，相同尺寸的六边形SRR周期性排列而成的一维负磁导率材料存在一个谐振频率；当缺陷谐振环引入一维负磁导率材料时，主谐振频率和缺陷环谐振频率同时发生移动；主谐振频率和缺陷环谐振频率的移动量随缺陷与双环谐振频率之差的增加而减小，当缺陷环谐振频率与双环谐振频率接近时，环间的相互作用增强，频率的移动量增大. 关键词： 负磁导率 缺陷效应 开口谐振环     

用角分辨光电子能谱研究Co/Cu(111)外延超薄膜的电子结构

利用同步辐射角分辨光电子能谱研究了分子束外延生长的Co/Cu(111)超薄膜电子结构的变化.Cu(111)的位于表面布里渊区Γ点的表面态在覆盖度为两单层时仍然可以分辨,说明薄膜生长模式不是二维层状生长.在一单层和二单层时,动量沿Cu体布里渊区ΓΛL方向变化,Co的最明显的峰包有能量色散.在覆盖度从一单层到两单层的变化过程中,固定光子能量测谱发现Co的能带的能量调整.实验测得的Co膜的电子结构与已有理论计算的结果对比,初步确定Co原子在生长初期阶段为两层岛生长,而且在一单层时已经具有铁磁性.     

THE SOLUTION FOR TRANSIENT TWO-PHASE FLOW BY SPLIT FLUX VECTOR METHOD

In this paper the transient two-phase flow equations and their eigenvalues are first intreduced. The flux vector is then split into subvectors which just contain a specially signed eigenvalue. Using one-sided spatial difJerence operators finite difference equations and their solutions are obtained. Finally comparison with experiment shows the predicted results produce good agreement with experimental data.     

Study of Hard-sealed,Tunable,Photoelastic Birefringent Dual-frequency Lasers

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