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沧东电厂单台日制淡水量为10000t/d（共两台）低温多效海水淡化装置,自2006年3月投运以来,运行一年半时间,受到海水预处理及其他方面的影响,运行中的问题逯渐暴露出来,主要表现在板式换热器效率降低,海水淡化造水比下降,根据运行中对数据及解体检查分析,采取必要的改进措施,使海水淡化蒸发装置稳定运行,降低蒸发器结垢腐蚀情况。从而延长设备使用寿命,降低维护成本,进一步提高安全可靠稳定性,进行必要的改进试验,提高海水淡化装置的有效利用率,使低温多效海水淡化装置得到广泛的应用和发展,同时为港区供水提供可靠保证。 相似文献
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机械蒸汽再压缩热泵技术是一项高效环保的节能技术,广泛应用于化工、轻工、食品、制药、海水淡化、污水处理等领域的溶液蒸发工艺过程中.国外热泵蒸发技术成熟,在民用行业和放射性废液处理领域应用广泛.我国热泵技术与国外相比应用差距明显,虽然在制盐、化工等民用行业应用日趋普遍,但在放射性废液处理领域尚未有应用实例,中国原子能科学研究院于2021年首次实现了热泵技术在放射性废液处理领域的国产化. 相似文献
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本文应用连续流循环模型研究传热的不可逆性和工质的内不可逆性对高温吸收式热泵性能的影响，导出高温吸收式热泵的两个重要性能参数——最大供热率及其所对应的供热系数．并对传热面积及有关性能作了优化分析，得到一些有意义的新结果． 相似文献
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将太阳能集热系统与空气源热泵系统结合起来,通过板式换热器耦合,构建太阳能-空气源热泵系统,计算系统传热的有效能消耗率,充分利用太阳能,降低系统的能耗.从不可逆过程有效能消耗率分析出发,定义传热有效能消耗率为总有效能消耗率与总输入或输出有效能之比.给出有效能消耗率方程,有效能消耗源强度以及有效能消耗率最小原理,比较了有效能消耗率与熵产率和煅耗散率的关系,实现太阳能-空气源热泵系统传热有效能消耗率的精准计算.通过对比实验验证本文方法的有效性.实验结果表明,所提方法计算结果准确,计算速度较快,对优化太阳能-空气源热泵系统供热效率具有重要作用. 相似文献
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为了评估不同工况下冰箱换热器的性能,以R134a为工质以开发的冰箱换热器性能测试系统为平台,研究不同工况下换热器的换热性能和压降。测试蒸发器为全铝翅片管式风冷蒸发器。实验研究的制冷剂质量流量范围为0.75～2.04g/s,蒸发压力为0.13～0.26Mpa,蒸发干度分别为0.2、0.3、0.4、0.5。实验表明干度和饱和压力对蒸发器的换热性能和压降有较大影响. 相似文献
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<正>随着淡水资源日益增长的需求和日渐稀缺,人们不断寻求探索产生淡水的其它技术手段来解决淡水稀缺的问题,其中我国沿海地带具有丰富的海水资源,海水淡化成为解决该问题的首选。海水淡化技术工艺繁杂,包括多级闪蒸法、低温多效蒸馏法、反渗透法、电渗析法、冻结法及离子交换法等。鉴于技术成熟度和经济成本的制约,目前取得商业化应用成功的技术主要有三种,分别是多级闪蒸（MSF）、低温多效蒸馏（MED）和反渗透（RO）。低温多效蒸馏海水淡化技术具有节能、海水预处理要求低、海水淡化水品质高等优点。本文针对低温多效蒸馏海水淡化技术在中国的专利申请量、主要申请人、专利法律状态等方面进行专利分析。 相似文献
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热泵蒸发技术是一种对废热进行回收再利用的技术,在对废热进行蒸发的过程中会产生携带一定量的放射性液沫的二次蒸汽。这种二次蒸汽具有较高的污染指数。但除沫分离器是组成热泵蒸发装置的重要设备,该设备可以有效去除蒸汽水肿携带的液滴,从而降低冷凝水的放射性。本文对放射性废液热泵蒸发装置去污效率进行了研究,希望对相关人员有帮助。 相似文献
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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
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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
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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
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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
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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
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Milton Mueller 《The Information Society》2001,17(3):151-163
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. 相似文献
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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.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
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. 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<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 相似文献
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Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
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WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献