植被排列方式及坡度对坡面流Fr影响的试验研究

为探究植被的排列方式及坡度大小对坡面流弗劳德数Fr的影响,以期揭示坡面流弗劳德数Fr的内在规律。利用人工模拟试验,系统研究了6个坡度、3种植物排列方向与水流方向呈不同走向角的条件下Fr与单位底面积的空间摩阻表面积K值的特征关系。表明在非淹没状态下,Fr与K值的关系为随K值的增大Fr呈现先减小后趋于平稳的趋势;Fr的取值随坡度的增大而增大;在一定的坡度范围内,同一坡度下,当Fr1时,同一K值下,走向角越大对应的Fr值越小,当Fr1时则相反;同一走向角下,在同一K值下,坡度越大对应的Fr就越大。得出在坡度一定的条件下,坡面植被的排列方式不同,弗劳德数Fr的取值也不相同;坡度是影响Fr取值范围的重要因素之一。     

重钙装置改产磷铵后氨化造粒机内部构件的配置研究

重钙装置改产磷铵后,造粒机内的物料行为发生了变化,即“料浆涂布－水分蒸发－氨化反应”这一物理化学过程。喷氨孔与水平线的夹角是影响这一过程的重要因素,本文对夹角的确定进行了理论分析。在实验基础上,对造粒机预中和料浆喷头位置、氨分布管的长度和角度进行了重新配置。生产表明,重新配置的造粒机内部构件具有很好的造粒效果。     

MDI子窗体最佳层叠平铺算法及程序实现

针对VB 6.0编程软件界面不够美观,需要使用第三方皮肤系统进行界面美化,以及Skinsharp等高效的皮肤控件对MDI窗体的支持不够稳定,经常出现移动窗体后无法对窗体重新排列的问题,提出了模拟VB对MDI窗体的排列效果,实现与VB类似的MDI窗体平铺算法,实现了层叠、水平和垂直三种排列效果,并在此基础上增加了弹性层叠功能和固定窗体次序功能。所用方法解决了加载皮肤后子窗体无法排列的问题。结果表明：所用算法的执行效率不高,只有VB方法的二分之一,特别是加上皮肤后层叠的效率下降较多;但当窗体数量较少时,所用算法具有一定实用性,可以作为加载皮肤系统时VB默认排列的替代方法。     

纤维取向的研究进展及应用

主要阐述了短切纤维增强复合材料的纤维取向的广泛应用及其研究进展；简单描述了纤维取向的计算方法以及对于纤维取向在各个方面的概述；展望了纤维取向在塑料工业的应用。     

Unique molecular aggregation of novel naphthalocyanine (near IR absorbing dye)

A series of organic-soluble naphthalocyanine derivatives (Y_mMNcX₄) have been synthesized. Their spectroscopic properties in organic solutions and in thin films were studied. MNcX₄ such as MNc(t-Bu)₄ (5a-5c) and MNc(On-Bu)₄ (5j) formed H-aggregates even in dilute solutions. MNc(CO₂R')₄ (5d-5i) had much stronger H-aggregation properties compared with those ofMNc(t-Bu)₄ and MNc(On-Bu)₄. Especially, MNc(CO₂R')₇ complexes (M=Cu, Pd and Ni) existed exclusively without monomers in the aggregated state even in highly dilute solutions. MNcX₄, which has strong H-aggregation properties, showed merely H- aggregate absorption maxima in thin films. In contrast, Y₂MNcX₄ (4), which has sterically hindered Y groups, showed monomerically pure characteristics in solution. However, thin films of Y₂MNcX₄ have a J-type molecular arrangement, exhibiting a red shift of Q-band absorption. The monomeric properties of Y₂MNcX₄ in solutions and J-type molecular arrangement in thin films arise from steric hindrance of two Y groups, such as R₃SiO-in Y₂MNcX₄, which prevents strong H-aggregation of naphthalocyanine.     

基于SOA架构服务组合技术研究与实现

传统的软件系统和业务流程的紧耦合,使得系统不能为新的业务需求提供容易的、快速的、动态的支持,尤其是跨部门、跨系统的业务需求。针对这种现状,提出了基于SOA架构下的服务组合技术,并在此基础上,利用WS-BPEL实现基于工作流的服务组合,使得建立的业务流程具有高度的松耦合性、服务的重用性和高度的敏捷性,满足新的业务需求变化需求.     

NBA常规赛同部不同区的球队的比赛安排

NBA常规赛同部不同区球队的比赛有的队赛3场有的队赛4场,故NBA常规赛同部不同区球队的比赛安排是整个赛程安排的难点。笔者分别以公平性及观赏性为目标,作出了NBA常规赛中同部不同区的球队的比赛安排。且用行、列追逐法对赛3场时的主、客场作出了安排。     

中美大学思想政治教育课程设置比较分析

通过比较中关两国大学各自的思想政治教育课程设置状况,分析了二者在思想政治教育课程设置上的共性与特性,探讨了美国高校有益经验对中国高校思想政治教育的启示。     

Membrane proteins: from sequence to structure

The prediction of protein structure from sequence has been along-standing goal of molecular biology. Integral membrane proteins,once abhorred by protein chemists and crystallographers becauseof their insolubility and stubborn refusal to yield good crystals,now appear to hold great promises for efficient structure predictionand engineering. This is mainly due to the constraints on permissiblestructures imposed by the lipid environment, and to the apparentuncoupling between an initial membrane targeting and insertionprocess which determines the overall topological arrangementof the transmembrane segments and a subsequent –condensation—of these segments into a unique folded state. Recent work suggeststhat the membrane insertion process is controlled by simplesequence elements composed of different combinations of longhydrophobic regions and flanking charged residues. In this reviewwe sketch the most unportant structural rules relating aminoacid sequence to membrane insertion to fully folded molecule,and their use for prediction and protein-engineering purposes.     

Low-complexity optimal spatial channel pairing for AF-based multi-pair two-way relay networks

This paper considers a multi-pair two-way relay system with multi-antenna users and proposes a low-complexity optimal spatial channel pairing （SCP） strategy at the relay station （RS） for such a system. The proposed SCP scheme, following the BD-like beamformer at RS, pairs the uplink spatial subchannels of each user pair with the corresponding downlink spatial subchannels by maximizing sum-rate （Max-SR）. Furthermore, a new mathematical inequality （arrangement inequalities of a product） is developed and applied to obtain sufficient and necessary conditions for achieving Max-SR-SCP. This also yields a simple low-complexity implementation of the proposed SCP in contrast to the NP-hard complexity of the original Max-SR-SCP problem. Simulation results illustrate that the proposed Max-SR-SCP achieves substantial sum-rate gains over other pairing schemes.