共查询到20条相似文献，搜索用时 482 毫秒
1.
节能降耗是当前我国工业实现可持续发展的必然要求,作为资源消耗大户的炼钢生产必须深入研究节能降耗技术。文章介绍了电弧炉炼钢几种节能技术及工艺特点和效率。 相似文献
2.
介绍了在用电弧炉生产特殊钢过程当中一些相关技术情况,重点介绍铁水热装技术,采用优质耐火材料大幅度提高炉衬寿命,强化冶炼提高电弧炉生产率,电弧炉炼钢过程中脱碳操作技术,以及强化用氧技术。 相似文献
3.
传统的电弧炉氧化法炼钢在还原期的冶炼时间长,不仅增加电耗且降低炉寿。随着高功率电弧炉的出现,用沉淀脱氧法为主的复合脱氧取代传统还原期进行的扩散脱氧法的单渣法冶炼正在被逐渐采用,其综合冶炼质量指标可达到或超过用传统三期熔炼法生产的钢的品质。本文就在超过功率电弧炉下对单渣法冶炼低合金钢冶炼工艺进行了阐述,并根据本人的经验提出了建议。 相似文献
4.
5.
电炉炼钢设备广泛应用于目前的大中钢厂,通过电炉进行粗炼、精炼炉进行精炼,从而生产出符合工艺规程和各项指标的合格铸锭产品.炼钢过程中温度高、震动大、噪音大、维修条件差、能量耗损巨大,如果发生突发事件,极易对炼钢产生的铸锭品质造成非常大的影响,或者造成后续的精炼过程耗费的流程更长,花费的费用更高.针对服务单位炼钢用电弧炉在炼钢过程中导电横臂前端面和电极卡头结合面之间的漏水问题,基于TRIZ理论对炼钢用电弧炉导电横臂供回水方式优化设计改造,以保证炼钢的顺利. 相似文献
6.
技术扩散是技术创新大过程中的一个后续子过程，但同时。它又是一个完整独立的技术与经济结合的运动过程。传统的技术扩散理论停留在对技术采用者的分析上。而在我国，许多条件约束外商直接投资企业技术在我国的扩散。 相似文献
7.
21世纪，“节能减排”成为全球性话语，当世界各国的有识之士都在为地球和人类的未来疾呼奔走、出谋划策的时候．有这样一位教授．着眼于炼钢过程的节能减排．经过多年潜心研究．找到了一种节能低污染型的炼钢操作方法。如果采用这种生产模式．按我国转炉钢产量5亿吨／年计算，将减少冶金石灰生产约2500万吨／年．其带来的大量污染可消除； 相似文献
8.
9.
技术引进、创新和扩散的双向循环：—论我国的“技术与市场联动”策略 总被引：7，自引：0，他引：7
本文就当今世界经济发展的特点，结合我国经济发展现状及经验，提出了“技术与市场联动”策略，并从技术引进、技术创新和技术扩散的双向循环着手，对其进行了系统的论，同时详细分析了双向循环中的各关键环节及主要要素，最后结合我国现阶段实际情况给出技术与市场联动的总体框架。 相似文献
10.
技术创新、技术扩散与技术进步关系新论 总被引：20，自引：2，他引：20
本文引用物理学中关于势能、势差、能量转换及转移的概念，来探讨技术经济系统中从技术创新、技术扩散、到技术进步的机理。论述了技术势的形成及其特征、技术势差与技术扩散过程、技术创新引起的技术能量积聚与技术创新本身相互具有正作用关系，以及技术扩散是实现社会总体技术进步的充分必要条件。 相似文献
11.
A research 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 in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
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. 相似文献
12.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
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. 相似文献
13.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US 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 the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
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. 相似文献
14.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
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. 相似文献
15.
Active biological molecules 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 therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
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. 相似文献
16.
《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
17.
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. 相似文献
18.
《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
Puay Tang 《The Information Society》1998,14(1):19-31
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. 相似文献