谈公共图书馆公益性讲座的专业化发展道路

阐述了图书馆讲座工作的核心价值和定位,介绍了公益性讲座的作用,指出公益性讲座要走以人为本和专业化道路.     

高师《美术教学论》课程资源的开发和利用

目前,课程资源的开发和利用已成为新一轮基础课改的热门话题.通过对上海师范大学美术学院《美术教学论》一个学期的观摩教学,对高师美术课程资源的开发及利用获得了一些启示.     

河南省畜牧业竞争力时空差异分析

畜牧业竞争力是一个地区畜牧业发展水平的综合体现,以河南省为例,运用主成分分析和聚类分析的方法,选取综合反映畜牧业综合竞争力水平的38个指标,通过分类对比对河南省18个省辖市的畜牧业竞争力进行了分析.从18省辖市畜牧业竞争力得分排名,可以看出从1999年到2008年18个省辖市畜牧业竞争力的动态变化特征,并可分为几种区域...     

Coupled 142Nd-143Nd evidence for a protracted magma ocean in Mars

Resolving early silicate differentiation timescales is crucial for understanding the chemical evolution and thermal histories of terrestrial planets. Planetary-scale magma oceans are thought to have formed during early stages of differentiation, but the longevity of such magma oceans is poorly constrained. In Mars, the absence of vigorous convection and plate tectonics has limited the scale of compositional mixing within its interior, thus preserving the early stages of planetary differentiation. The SNC (Shergotty-Nakhla-Chassigny) meteorites from Mars retain 'memory' of these events. Here we apply the short-lived 146Sm-142Nd and the long-lived 147Sm-143Nd chronometers to a suite of shergottites to unravel the history of early silicate differentiation in Mars. Our data are best explained by progressive crystallization of a magma ocean with a duration of approximately 100 million years after core formation. This prolonged solidification requires the existence of a primitive thick atmosphere on Mars that reduces the cooling rate of the interior.     

"校园一卡通"系统的设计

文章在对高校使用"校园一卡通"进行分析[1]的基础上,以IC卡为信息载体,对校园消费、管理系统的组成、硬件的构成及网络系统进行了设计.     

激光热应力切割玻璃实验与分析

CO２激光器平均输出功率为１００W时,通过聚焦光路在玻璃表面形成圆型的聚焦点。玻璃强烈地吸 收１０畅６μm的激光,激光能量被玻璃表面１５μm厚的吸收层吸收,形成局部的应力纹样分布（设定的切割线）。 介绍了淬火气嘴将冷空气吹到玻璃表面对受热区域进行快速淬火;１００W的激光能量照射玻璃表面,产生高于玻 璃软化的温度;吹气冷却形成应力集中的热应力层,使玻璃从切开的断口沿切割线断开,断口光洁。实验证明, 激光热应力切割玻璃的最佳速度是４００mm桙s。     

中国公共安全科技问题分析与发展战略规划研究

在给出公共安全系统性定义的基础上提出了公共安全综合指数的概念,讨论了不确定性的特点和系 统非优分析的方法,同时建立了公共安全运行体系。基于安全指数给出了公共安全控制能力指数,并且讨论了 不确定因素的分析方法。研究表明,公共安全科技贡献率是科技发展战略研究的关键,建立了科技投入与公共 安全目标函数,并且讨论了科技贡献增长率的投入产出关系。     

Operational properties and matrix representations of quantum measures

Denoted by M(A), QM(A) and SQM(A) the sets of all measures, quantum measures and subadditive quantum measures on a σ-algebra A, respectively. We observe that these sets are all positive cones in the real vector space F(A) of all real-valued functions on A and prove that M(A) is a face of SQM(A). It is proved that the product of m grade-1 measures is a grade-m measure. By combining a matrix M _μ to a quantum measure μ on the power set A _n of an n-element set X, it is proved that μ ≪ ν (resp. μ ⊥ ν) if and only if M _μ ≪ M _ν (resp. M _μ M _ν =0). Also, it is shown that two nontrivial measures μ and ν are mutually absolutely continuous if and only if μ·ν∈QM(A _n ). Moreover, the matrices corresponding to quantum measures are characterized. Finally, convergence of a sequence of quantum measures on A _n is introduced and discussed; especially, the Vitali-Hahn-Saks theorem for quantum measures is proved.     

超声辅助萃取-高效液相色谱法测定牛奶中9种β-内酰胺抗生素残留

 建立了一种采用超声辅助萃取-高效液相色谱法检测牛奶中9种β-内酰胺抗生素残留的方法.牛奶样品经过乙腈沉淀蛋白,磷酸盐缓冲溶液为提取液,20kHz超声处理5min,离心处理,固相萃取小柱净化,采用Agilent TC C18 (150mm×4.6mm,5μm)色谱柱,选用磷酸盐-甲醇作流动相进行梯度洗脱,流速1.0mL/min,220nm检测,在22min内分离检测.方法可用于牛奶中上述抗生素残留的同时检测.     

Borel归约与Banach空间之间的有穷(M1/M2)嵌入

对一个可分的Banach空间X以及一个在0点满足△2条件的Orlicz函数M,考察了XN上的等价关系E(X,M):(x,y)∈E(X,M)(=)∑M(n∈N)(‖ y(n)-x(n)‖)＜∞,给出了E(X,M1)能够Borel归约到E(y,M2)的一个充分条件与一个必要条件.