准确快捷的氧化膜阻变(碱斑)试验

本文详细介绍了铝合金阳极氧化膜,在碱性介质条件下,铝合金阳极氧化膜与铝合金之间电阻变化较大的特点,记录了碱液对氧化膜穿透时间。实践证明氧化膜阻变(碱斑)试验不仅准确快捷,操作方便而且成本低,具有很好的推广价值。     

铝合金微弧氧化技术的研究及其应用

本文介绍了铝合金微弧氧化技术的工艺特点和氧化物陶瓷膜层性能。比较了微弧氧化技术和阳极氧化技术的工艺特点及其性能特征。分析了国内外微弧氧化技术的研究进展及其应用前景。     

浅谈我国水处理中的高级氧化技术

从羟基自由基无选择性地氧化有机物出发,综述了我国水处理中的高级氧化技术,包括化学氧化、Fenton法、电化学阳极氧化、光化学氧化、湿式空气氧化、超临界水氧化及超声波技术等.介绍了各种技术的机理,讨论了它们的优缺点及其在废水处理中的处理效果.     

2A97铝锂合金硫酸阳极化工艺适用性研究

按铝合金现有的硫酸阳极化工艺对2A97铝锂合金进行硫酸阳极氧化处理和涂漆,通过膜层的膜重、耐蚀性及涂层结合力等性能指标的测试进行2A97铝锂合金硫酸阳极化适用性的研究。     

铝合金表面改性技术研究进展

综述了近年来铝合金表面改性技术取得的研究进展,重点介绍了激光熔覆、阳极氧化和等离子体微弧氧化等方法在铝合金表面制备膜层的原理、特点及研究成果,并对等离子微弧氧化技术提出了展望。     

氯酸盐电化生产过程的反应模型

利用氧阴极与ＤＳＡ阳极组装成一种新型氯酸盐电解槽。在分析阳极表面ＯＣｌ－氧化反应途径的基础上改进了阳极表面的反应模型，对扩散层内氯的水解分率进行了计算，并讨论了活性氯转化反应的活化能、阳极表面流体的流动状态以及氯酸盐浓度与电流效率的关系。     

浅谈我国水处理中的高级氧化技术

从羟基自由基无选择性地氧化有机物出发，综述了我国水处理中的高级氧化技术，包括化学氧化、Fenton法、电化学阳极氧化、光化学氧化、湿式空气氧化、超临界水氧化及超声波技术等。介绍了各种技术的机理，讨论了它们的优缺点及其在废水处理中的处理效果。     

TRIZ理论在制备多孔阳极氧化铝模板过程中的应用

多孔阳极氧化铝模板(Anodic Aluminum Oxide,AAO)由于具有制备廉价,成品结构高度有序性、组装方法多样等特点,在纳米材料、功能材料等领域已被广泛地研究和应用。制备AAO的过程中需要在电解液中进行阳极氧化,氧化过程容易出现铝(氧化铝)被击穿的现象。TRIZ理论正是解决各种工程及生产问题的方法,基于TRIZ理论,进行了功能分析,技术矛盾分析,并利用阿奇舒勒矩阵以及标准解,最终找到了避免AAO在氧化过程中被击穿的可行方案。     

钛合金阳极氧化工艺对环境的潜在危害

基于钛合金阳极氧化工艺流程,对工序中可能对环境产生影响的关键环节进行了分析;从"三废"角度系统分析了工艺流程中产生的废水、废气、废渣的成分,并提炼出对环境、人体有严重危害的化学物质及其潜在危害途径;针对工艺流程中产生的废水中的酸碱、重金属、氰化物,废气中的含尘气体、酸碱雾,废渣等提出了合理的防治、处理措施,力求减少钛合金阳极氧化工艺流程中产生的有害物质对环境及人体的危害。     

铝阳极氧化挂具的革命

铝合金阳极氧化和化学氧化中一般要使用挂具进行装夹和导电,传统的挂具是使用铝丝或专用铝制挂具,本文根据航空产品小批量、多品种的特点,研制一种新型铝合金装挂挂具钛制万能挂具,方便、实用、效率高。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

Low doses of a red wine ingredient figh diabetes in mice

Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Molecular motor assembly of a biomimetic system

Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence