无后处理钢铁常温发黑新工艺及机理

本文介绍无后处理钢铁常温发黑剂的组成，作用及工艺，综合测试了发黑膜的性能及氧化还原的动电位曲线和发黑过程的电位－时间曲线，借助电镜扫描分析了发黑膜的形貌，提出了可能的机理。     

我国移动通信量差异的人口学分析

引人了地理迁移关系模型和社会网络人类动力学模型,将前一个模型中的“1个原型网络系统和2个变形网络系统”转换为演变过程的原始状态、迁移及适应3个阶段,将后一个模型中的“社会网络的典型特征——较高的集聚和较短的平均路径”分解为2个类型(非群体类型和群体类型),作为我国移动通信量人口学分析的研究方法.构建了我国各省的包括3个人口迁移指标、4个人口技术构成指标在内的人口学数据系统,针对3个重要的移动通信指标,分别解释人口学要素与移动通信量的内在联系.研究发现:1)应用地理迁移关系模型可以较好地描述不同演变阶段人口迁移对移动通信使用的影响,这种影响是通过保持原有链接、构建产生新链接而完成的;2)应用社会网络人类动力学模型可以较好地描述人口技术构成因素对移动通信使用的影响.     

Relationship between prospective memory and vigilance: Evidence from ERP

Event-related potentials (ERPs) were used in this study to investigate the neural correlates of prospective memory (PM) and vigilance. Twenty college or graduate students participated in this study. They were administered a PM and a vigilance task and physiological data were collected at the same time. Behavioral results showed that the RT associated with PM cues was longer than those associated with vigilance targets. ERP results showed that PM cues and vigilance targets did not show significant difference in the N2 but PM cues evoked greater N300 than vigilance targets, and vigilance targets evoked greater parietal positivity/P3 than PM cues, suggesting vigilance and PM have similar but also distinctive neural basis.     

监测奶牛无线传感器网络的连通支配集构造

基于一个对奶牛行为特征监测的自组织无线传感器网络,构造骨干网以解决节点多跳通信问题,并采用图的连通支配集来实现。提出了一个基于极大独立集的最小连通支配集的分布式构造算法,并证明了该算法的正确性。采用计算机程序仿真的实验结果表明,此算法简单有效、适应于节点移动和网络拓扑变化的环境、且构造的连通支配集占节点的比例为30%左右,有效减少冗余的转发节点,可节省宝贵的网络资源。     

A small-molecule screen in C. elegans yields a new calcium channel antagonist

Small-molecule inhibitors of protein function are powerful tools for biological analysis and can lead to the development of new drugs. However, a major bottleneck in generating useful small-molecule tools is target identification. Here we show that Caenorhabditis elegans can provide a platform for both the discovery of new bioactive compounds and target identification. We screened 14,100 small molecules for bioactivity in wild-type worms and identified 308 compounds that induce a variety of phenotypes. One compound that we named nemadipine-A induces marked defects in morphology and egg-laying. Nemadipine-A resembles a class of widely prescribed anti-hypertension drugs called the 1,4-dihydropyridines (DHPs) that antagonize the alpha1-subunit of L-type calcium channels. Through a genetic suppressor screen, we identified egl-19 as the sole candidate target of nemadipine-A, a conclusion that is supported by several additional lines of evidence. egl-19 encodes the only L-type calcium channel alpha1-subunit in the C. elegans genome. We show that nemadipine-A can also antagonize vertebrate L-type calcium channels, demonstrating that worms and vertebrates share the orthologous protein target. Conversely, FDA-approved DHPs fail to elicit robust phenotypes, making nemadipine-A a unique tool to screen for genetic interactions with this important class of drugs. Finally, we demonstrate the utility of nemadipine-A by using it to reveal redundancy among three calcium channels in the egg-laying circuit. Our study demonstrates that C. elegans enables rapid identification of new small-molecule tools and their targets.     

Evaluation of Woven Fabrics for Comfort Properties in Children’s Summer Wear

This paper evaluates the comfort properties of eightkinds of woven fabric commonly used for children'ssummer wear in Hong Kong,China.Due to the expan-sion of children's wear market and the quality require-ment for parents,objective and subjective measurementsare the main methods used to evaluate the chosen fabricsfor garment deslgners and consumers as reference. Objective measurement was carried out through ex-periments by means of the Kawabata Evaluation Systemfor Fabrics(KES-F).Experimental tests on fabrics in-clude compression,surface,bending,air permeability,thermal and tensile.Subjective measurement was con-ducted by a market research on consumers' opinions onfabrics for children's summer wear in the form of ques-tionnaire survey.These two ways of measurement onfabrics were analyzed and compared. It was found that Fabric Sample 6 which is com-posed of polyester and cotton fibre has the best perfor-mance in terms of its comfort properties.Besides,Sam-ple 4 composes of rayon and cotton fibre also ha     

中药发酵技术及其在畜牧业中的应用

中药作为中华民族的瑰宝,在防治人类和动物疾病方面做出了巨大贡献.但是,中药成分和结构复杂,有效成分含量较低,且人工不易合成,加之中药的人工栽培成本高、周期也长,所以很难达到工业化生产的要求,远远不能满足市场的需求.近年来,中药发酵制药技术为实现中药现代化开辟了新的思路和途径.本文拟从中药发酵技术、中药发酵的特点和优势以及发酵中药在畜牧业中的应用等几个方面进行阐述.