小麦液泡膜H~ -ATPase的Ca~(2 )激活特性

纯化小麦液泡膜H -ATPase,测定了纯化的小麦液泡膜H -ATPase 受Mg2 和Ca2 双重激活的特性及两种激活状态下酶的特性. Mg2 激活时酶水解活性受DCCD的抑制,受磷脂酰丝氨酸(PS)影响明显,ATP水解和泵质子活性相偶联.而在Ca2 激活时酶水解活性不受DCCD抑制,受PS影响微弱,Ca2 激活时ATP水解与泵质子活性解偶联. Mg2 和Ca2 对小麦液泡膜H -ATPase的激活作用不具有叠加效应.     

土木工程投标报价风险补偿费用的研究

基于模糊集理论，AHP原理以及土木工程投标承包的系统性和程序性特点，建立起工程风险之间存在可依赖性的风险分析模型，为风险补偿费用的确定提供较为科学的依据。     

四苯骈卟啉锌纯化和脱锌的研究

通过系统研究,改进了四苯骈卟啉锌的纯化和脱锌的方法,发现用浓硫酸脱锌时绿色物质的生成与温度有关. 纯化方法经改进,产率和纯度均有所提高.     

多帧融合处理技术在运动模糊图像复原中的应用

运动模糊图像是电视监控中常见的退化图像 ,也是图像处理和检验工作中的难题。针对电视摄像的特点 ,多帧融合处理技术从图像时间序列中提取景物的运动信息 ,构造复原滤波器 ,通过频率域反转滤波方式复原模糊图像。这项技术能够有效地增强电视监控中存在的运动模糊图像 ,并且适用于数字视频图像处理     

Oxidative carbonylation of phenol to diphenyl carbonate catalyzed by palladium complexes bridged with N,N‐ligands over functionalized silica

Heterogeneous palladium catalysts anchored on functionalized silica were prepared by sol–gel methods and their catalytic properties for the oxidative carbonylation of phenol to diphenyl carbonate (DPC) were investigated. The catalysts were characterized by means of IR, XPS, EA and BET. The Pd loading in the heterogeneous catalysts and leaching in solution were detected by atomic absorption. The effects of different reaction parameters such as temperature, solvent and inorganic cocatalyst on the yield of DPC and Pd leaching were also studied. It was found that Cu₂O and tetrahydrofuran (THF) were the best partners with these heterogeneous catalysts. In the presence of 3 Å molecular sieves as dehydrating agent, the heterogeneous palladium catalyst prepared from 2‐acylpyridine revealed excellent catalytic performance and stability at 110 °C for 5 h, giving 13.7% yield of DPC based on phenol and 4.0% Pd loss in solution. The heterogeneous catalyst was more active and stable compared with traditional supported Pd? C catalyst under the same reaction conditions. Copyright © 2005 John Wiley & Sons, Ltd.     

Transverse spin structure of the nucleon from lattice-QCD simulations

We present the first calculation in lattice QCD of the lowest two moments of transverse spin densities of quarks in the nucleon. They encode correlations between quark spin and orbital angular momentum. Our dynamical simulations are based on two flavors of clover-improved Wilson fermions and Wilson gluons. We find significant contributions from certain quark helicity flip generalized parton distributions, leading to strongly distorted densities of transversely polarized quarks in the nucleon. In particular, based on our results and recent arguments by Burkardt [Phys. Rev. D 72, 094020 (2005)], we predict that the Boer-Mulders function h(1/1), describing correlations of transverse quark spin and intrinsic transverse momentum of quarks, is large and negative for both up and down quarks.     

基于logistic模型的企业和谐劳动关系影响因素研究

选取广东省佛山市顺德区国家级和谐劳动关系综合试验区162家企业为样本,以劳动合同、薪酬福利与社会保障、劳动安全卫生保护、员工发展与民主管理、劳动争议及调处等作为劳动关系评价的5个维度.从企业、高管及员工层面基于logistic回归模型研究和谐劳动关系的影响因素.研究结果表明:企业层面,企业的所有权登记状态以及生产方式属性对劳动关系有显著影响.高管层面,年龄、教育程度、是否本企业的业主之一、是否企业的开创者、本行业工作的年限、现企业工作的年限、担任高管职位的年限对劳动关系有显著影响.员工层面,年龄、文化程度、婚姻状况对劳动关系有显著影响.据此,提出了改善劳动关系的具体建议,这对正确认识和处理新时代劳动关系的和谐运行具有一定现实意义.     

BBO，LBO，KDP晶体光参量啁啾脉冲放大特性的比较研究

 对BBO，LBO，KDP晶体I类非共线匹配下的光参量啁啾脉冲放大的相位匹配、参量范围、增益特性等进行了理论分析，重点对BBO和LBO的光参量啁啾脉冲放大特性进行了比较。结果表明对于以光参量啁啾脉冲放大系统代替800nm中心波长的Ti:sappire再生放大系统，用BBO晶体可获得更宽的增益带宽，而对1 053nm中心波长的种子光用LBO晶体更好。     

有矩形脉冲内热源的平板中非傅里叶导热研究

 对矩形激光短脉冲能量以内热源形式在有限厚绝热平板内释放所导致的非傅里叶导热过程进行了理论研究，利用格林函数与有限积分变换方法求得了绝热平板内温度分布的解析解,分析了平板内热波传播与反射行为以及温度场的特征。研究结果表明，温度波动频率取决于平板厚度和材料的热弛豫时间，而其幅值则与内热源释放区域的大小和脉冲宽度的长短有关。