Synthesis and properties of hyper-dispersants

The synthesis and properties of three kinds of hyper-dispersants are studied in this paper, which are non-terminated, carboxyl-terminated and polyethylene imine grafted poly(hydroxyl carboxylic acid) ester. The hyper-dispersants are synthesized by the materials of 12-hydroxy-stearic acid, stearic acid and polyethylene imine, which are used to improve the dispersion properties of nano titanium dioxide (nano-TiO₂) in low-concentration resin solution system. The influences of hyper-dispersants on the viscosity and stability of the system are studied. It is found that polyethylene imine grafted hyper-dispersant has the best dispersion performance in nano-TiO₂ dispersion system, and the optimal content of the hyper-dispersant is 4%. Project supported by the Shanghai Leading Academic Disciplines (Grant No.T0105), and the Key Laboratory of Science & Technology of Eco-Textile (Donghua University), Ministry of Education of China     

我国高校劳动合同制人员管理现状分析

随着我国高校规模的迅猛发展,近年来高校劳动合同制人员数量激增,并已成为高校教职工队伍的重要组成部分。本文在对劳动合同制人员界定的基础上,对劳动合同制人员产生的原因、特点及目前管理存在的问题进行分析,为今后高校相关政策规定的制定提供借鉴。     

压强公式的延伸及应用

所谓创造性提问,就是指教师在教学中,根据实际需要,提出一些没有唯一标准答案的开放性问题,让学生运用发散思维能力,产生多样、新奇、独特的反应.它重视容多纳异,鼓励学生通过想象、发散转化等各种方式,产生多种不同的想法,并希望能有突破常规的方法.     

Basic fibroblast growth factor alleviates brain injury following global ischemia reperfusion in rabbits

The aim of this study was to explore the protective effect of basic fibroblast growth factor (bFGF) on brain injury following global ischemia reperfusion and its mechanisms. Brain injury following global ischemia was induced by four vessels occlusion and systemic hypotension. Twenty-four rabbits were randomized into three groups: group A, only dissection of vessels; group B, intravenous infusion of normal saline after reperfusion for 6 h; group C, 30 μg/kg bFGF injected intravenously at the onset of reperfusion, then infused with 10 μg/(kg·h) for 6 h. Serum neuron specific enolase (NSE), S-100B, tumor necrosis factor-α(TNF-α), interleukin-1 (IL-1), interleukin-8 (IL-8) were measured before ischemia, 30 min after ischemia, 0.5, 1, 3, 6 h after reperfusion. Brain water content was determined and cerebral histopathological damages were compared. NSE and S-100B were increased 1 h after reperfusion and reached their peaks 6 h after reperfusion, but were much higher in group B than those in group C 3, 6 h after reperfusion. In groups B and C, TNF-a was increased after ischemia and IL-1 and IL-8 were increased significantly 0.5 h after reperfusion, then reached their peaks 6 h, 3 h, 6 h after reperfusion respectively. TNF-a and IL-8 at the time points of 1 h and 3 h and IL-1 at 3 h and 6 h in group C were correspondingly lower than those in group B. These indices in group A were nearly unchanged. There were less severe cerebral histopathological damages in group C compared with group B, but no difference in brain water content. It could be concluded that bFGF alleviates brain injury following global ischemia and reperfusion by down-regulating expression of inflammatory factors and inhibiting their activities.     

Gene editing in plants: progress and challenges

The clustered regularly interspaced short palindromic repeat (CRISPR)-associated protein 9 (Cas9) genome editing system is a powerful tool for targeted gene modifications in a wide range of species, including plants. Over the last few years, this system has revolutionized the way scientists perform genetic studies and crop breeding, due to its simplicity, flexibility, consistency and high efficiency. Considerable progress has been made in optimizing CRISPR/Cas9 systems in plants, particularly for targeted gene mutagenesis. However, there are still a number of important challenges ahead, including methods for the efficient delivery of CRISPR and other editing tools to most plants, and more effective strategies for sequence knock-ins and replacements. We provide our viewpoint on the goals, potential concerns and future challenges for the development and application of plant genome editing tools.     

浅谈网络经济对高职电子商务专业发展的影响

近年来,伴随着信息技术的迅猛发展,网络经济正以前所未有的速度在我国扩展,也给高职电子商务专业带来更多的活力和发展,同时也逐渐暴露出一些值得关注的问题。本文针对网络经济定义,对网络经济全球化环境中电子商务发展趋势的现状予以分析,指出我国高职电子商务专业发展中存在的问题,以探究相应的对策以及今后的发展。     

从专利统计数据看我国民营企业的自主创新

本文以2005年国家知识产权局开展的全国企业专利状况调查为基础,通过对调查所获得的我国民营企业专利状况的综合分析,从专利保护的角度阐述了我国民营企业进行自主创新的基本特点.希望用第一手翔实的数据为政府制定相关政策提供依据.     

劳动和社会保障部下发《关于推动高级技工学校技师学院加快培养高技能人才有关问题的意见》

为贯彻落实《中共中央办公厅、国务院办公厅印发（关于进一步加强高技能人才工作的意见）的通知》（中办发[2006]15号）精神，劳动和社会保障部近日下发《关于推动高级技工学校技师学院加快培养高技能人才有关问题的意见》，对高级技工学校和技师学院加快高技能人才培养有关事项提出了相关意见，摘录如下：     

互联网知识传播网络结构计量研究

本文首先梳理分析了网络结构计量的相关学科理论:图论、复杂网络、社会网络、信息计量,认为图论等相关数学知识是研究网络结构计量的基础.然后,将不同学科的研究还原到最原始的图,按照"点→边→子图→图"的分析思路建立了包含个体级、局部级、全局级三层指标的网络结构计量框架,进而结合互联网知识传播的特点构建了互联网知识传播网络结构计量指标体系.最后,借助于UCINET社会网络分析软件,针对小木虫论坛数据进行了互联网知识传播网络结构计量实证分析,提炼总结了现实互联网知识传播可能表现出的一些规律、现象以及存在的相关问题.     

一种网上电子投搞系统的设计与实现

利用ASP技术为《工业工程》杂志开发了一种网上电子投稿系统，作者能够通过Internet上的Web网页和E－mail投稿，缩短了稿件投寄周期，节省了时间和费用，简要介绍动态网页开发技术ASP，并详细阐述网上电子投稿系统的设计和实现过程.