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目的：建立硝苯地平缓释胶囊的释放度检查方法。方法：以盐酸溶液（9→100mL）1000mL溶出介质,转速为60r.min-1,取样时间为1h,4h,8h,采用释放度第一法,溶出度第二法测定。结果：硝苯地平在1.834-22.008μg.mL-1的浓度范围内,线性相关性良好。线性方程为：A=70580.3C-4008.4（r=0.9999）;平均回收率为100.4%,（RSD=1.14%）;6批样品在1h,4h,8h的释放量分别为标示量的15%-40%,30%-65%,50%-80%。结论：本方法便捷、准确、重现性好,可用于硝苯地平缓释胶囊的质量控制。 相似文献
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用煤矸石及硫铁矿烧渣作原料制备了一种高效复合混凝剂聚硅酸铝铁（PSAF）,并将其用于制革废水的处理。结果表明：在pH值6～9范围内,PSAF混凝剂对废水有较好的处理效果。在常温、pH值7～8、PSAF混凝剂用量为70mg/L条件下,S2-、SS、CODCr和Cr3＋的去除率分别为90.4%、87.5%、84.5%和80.6%。与传统混凝剂Al2（SO4）3和FeCl3相比,PSAF混凝剂具有混凝沉降速度快、处理废水后水中残余量低、处理废水费用低等特点。 相似文献
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目的：用高效液相色谱法同时测定复合制剂铃兰欣成分注射用头孢哌酮钠和舒巴坦钠的含量。方法：本法以外标法为基础，色谱条件：以ODS-3反相柱作为分析柱，流动相组成为0．005mmol／L四丁基氢氧化铵-乙腈（825：175，V／V），磷酸调整PH=5．0，流速为1．2ml／min，再自外检测器272nm进行检测。结果：本法注射用头孢哌酮钠和舒巴坦钠的最低检出浓度分别为10mg／L和5mg／L，在20-1000mg／L范围内呈线形，注射用头孢哌酮钠和舒巴坦钠的绝对回收率分别为99．4％-102．9％和95．0％～105.3％，批内和批间RSD分别为1.4％1．5％和1.8％1．9％，结论：此方法简便、快速、准确，可作为测定复合制剂铃兰欣含量方法. 相似文献
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半乳甘露寡糖和金霉素对育肥猪生长性能、屠宰性能、血清生化指标和猪肉品质的影响 总被引：5，自引：0，他引：5
将48头育肥猪（杜×长×大）随机分为两组，每组三个重复，在同一玉米－豆粕型基础日粮中分别添加0.1%半乳甘露寡糖(GMOS)和50mg/Kg 金霉素(CTC)，进行了46天的对比试验。饲养试验结束后从两个处理的每个重复分别选择一头阉公猪屠宰，结果表明1）生长性能：基础日粮添加0.1% GMOS与添加50mg/Kg CTC相比较，平均日增重提高10.2%（P<0.05），平均日采食量降低25.2%（P<0.01），料肉比下降13.2%（P<0.01）；2）屠宰性能：基础日粮添加 0.1%的GMOS与添加50mg/Kg的CTC相比较，背膘厚下降了15.6%，皮厚下降了11.5%，瘦肉率提高了2.94%，但经统计分析，差异均不显著(P>0.05)；3）血清生化指标：与添加50mg/Kg的CTC相比，基础日粮添加0.1%的GMOS可使育肥猪血清中的血糖水平升高120%（P<0.05），胆固醇水平下降3.86% (P>0.05)，甘油三脂水平下降42.6% (P>0.05)；4）猪肉品质：与添加50mg/Kg的金霉素相比，基础日粮添加0.1%的GMOS可显著降低肉中吲哚的含量（P<0.05），对其它肉质指标无显著影响。 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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《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
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《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
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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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Leah A. Lievrouw 《The Information Society》1998,14(2):83-96
The main premise of this article is that in information societies generally, and in virtual social contexts particularly, a distinctive style of interaction to facilitate the communication of difference, heterotopic communication , has emerged. It rests on two cultural foundations: an ideological belief in the positive, socially integrating power of communication, and a prevailing ethic of instrumental rationality, subjective individualism, and strategically practiced self-interest. The former is demonstrated by the use of simulation and spectacle as sources of information; exhibitionism/voyeurism as a communicative style; and the awareness of surveillance. The latter is seen in the competitive use of knowledge as a commodity; a surface globalism masking deep parochialism; lateral as well as vertical information inequity; and the use of public versus private as strategies for engagement rather than as spaces. Those who engage in heterotopic communication resort to their 'own devices' both in the sense of personal agendas, strategies, interests, and interpretations, and in the form of the telecommunication tools that help realize them. These personal and technological devices allow individuals with the right educational and technical resources to avoid exposure to disagreement, difference, or other information that does not serve their direct purposes or reflect their particular views of the world; yet they also help convey the appearance of openness, availability, and cooperation. This style of interaction is used strategically in combination with information and communication technologies to gain social or economic advantages, but it may encourage social separatism and parochialism, inhibit the negotiation of disputes, and emphasize competing interests. 相似文献