三碘苯酚乙基纤维素微球的制备     

刘瑞丽  姜庆军  刘士远  李文新 《中国科学院研究生院学报》2005,1(5):575-578

为提高造影剂的颗粒度,减少血池造影剂透过血管壁向组织间质渗出,影响血池造影剂的造影效果,采用液中干燥法( in-liquid drying method)制备了三碘苯酚乙基纤维素微球，研究了三碘苯酚与乙基纤维素的比例对微球成球性，粒径以及载药量的影响，发现两者的比例为1：2时成球性最好，所得微球为规整的球形，微球粒径最小，平均粒径D50为3.68um, 载药量为41.4%。  相似文献   

上海市2004年冬季城市大气气溶胶含Pb单颗粒物的来源查证   总被引：1，自引：0，他引：1  

李晓林  包良满  刘江峰  岳伟生  李燕  张桂林 《中国科学院研究生院学报》2007,24(5):688-691

采用质子微探针技术，分析单个大气气溶胶颗粒物。将微束质子激发X射线分析(Micro-PIXE)同计算机模式识别技术结合，查证上海市2004年冬季城市大气气溶胶PM10中含Pb单颗粒物的来源。结果在上海大气气溶胶PM10中识别出七种铅污染排放源，它们分别是：汽车尾气，钢铁工业排尘，燃煤烟尘，土壤扬尘，柴油车尾气，助动车尾气和水泥尘。其中，钢铁工业排尘和燃煤排尘是禁止使用有铅汽油后上海市地区大气铅污染的最主要排放源。  相似文献   

Alternate Broyden’s method for solving linear least squares problem with multiple right-hand sides     

Guiding Gu 《上海大学学报(英文版)》1997,1(3):196-201

In this paper, we extend the alternate Broyden’s method to the multiple version for solving linear least-square systems with multiple right-hand sides. We show that the method possesses property of a finite termination. Some numerical experiments are given to illustrate the effectiveness of the method.  相似文献   

An experimental setup for study of photoresponse of high T c superconductors     

Jiashan Bao  Kexi Xu  Shiping Zhou  Keqing Wu 《上海大学学报(英文版)》1997,1(1):15-19

We have developed an experimental setup that has been proven suitable for the study of photoresponse of high T _c superconductors. The distinguish feature of this experimental setup lies mainly in the data acquisition system which is equipped with computer as well as the IEEE-488 interface bus, which ensures the accuracy to experimental results. Using the experimental setup, the optical response to laser radiation in high-T _c superconductors has been examined, both of bolometric effect and nonequilibrium optical response are revealed. The project was supported by the National Natural Science Foundation of China  相似文献   

对企业研发合作动因的再认识     

王建华  闻燕  王海峰 《预测》2007,26(5):36-41,47

本文主要借用古诺模型的变换与讨论,对企业研发合作的动因问题进行了较为深入的分析,得出了企业开展研发合作不仅是“共摊费用、共担风险、共享成果”的需要,同时也是企业在竞争中获取“先发优势”、出清市场的重要手段等相应结论,进而对促进我国企业对外研发合作的发展问题提出了积极的建议。  相似文献   

神光Ⅱ高功率激光实验装置研制   总被引：1，自引：0，他引：1       下载免费PDF全文

朱健强 《中国科学院院刊》2005,20(1):42-44,85

惯性约束聚变(ICF)研究的长远目标,是实现可控核聚变,为人类提供理想的能源。神光Ⅱ高功率激光装置是由中国科学院、中国工程物理研究院、国家“863”计划支持的大科学工程项目。该装置是目前我国规模最大、国际上为数不多的高性能高功率固体激光装置,是我国中近期惯性约束聚变重要实验平台。  相似文献   

期刊全流程数字出版探索与实践 ——以《光学学报》为例     

何卓铭  王晓琰  宋梅梅  李瑞娟  马沂  王晓峰  杨蕾 《编辑学报》2020,32(3):242-246

随着互联网技术的不断发展,科技期刊面临重要转型。如何推动科技期刊数字化出版建设、媒体融合发展,快速提升期刊的影响力成为一个重要课题。本文以融媒体技术手段为依托,详细总结了期刊在选题策划、稿件处理、多模式出版、融媒体服务等方面的数字化建设经验,以供其他科技期刊学习和借鉴。  相似文献   

Development of a space cold atom clock     

Wei Ren  Tang Li  Qiuzhi Qu  Bin Wang  Lin Li  Desheng Lü  Weibiao Chen  Liang Liu 《国家科学评论(英文版)》2020,7(12):1828

Atomic clocks with cold atoms play important roles in the field of fundamental physics as well as primary frequency standards. Operating such cold atom clocks in space paves the way for further exploration in fundamental physics, for example dark matter and general relativity. We developed a space cold atom clock (SCAC), which was launched into orbit with the Space Lab TG-2 in 2016. Before it deorbited with TG-2 in 2019, the SCAC had been working continuously for almost 3 years. During the period in orbit, many scientific experiments and engineering tests were performed. In this article, we summarize the principle, development and in-orbit results. These works provide the basis for construction of a space-borne time-frequency system in deep space.  相似文献   

Enzyme dynamic study on calmodulin Ca++-Mg++-ATPase system of red blood cells inhibited by α-anordrin and probimane     

Dayong Lu  Enhong Chen  Jingyi Cao  Bin Xu 《上海大学学报(英文版)》1998,2(1):81-83

To clarify the possible mechanisms of α-anordin and probimane on calmodulin Ca⁺⁺-Mg⁺⁺ ATPase system, enzyme dynamic study was carried out by determining three dynamic parameters [the substrate concentration (ATP)-response curve, dose (inhibitors)-response curve and time-response curve]. Our data have shown that the inhibitory rates of α-anordrin and probimane are unrelated to substrate (APT) concentrations, but related to calmodulin concentrations. The inhibition of α-anordrin and probimane is very quick that is completed within 1 to 5 min and can maintain more than 1 hr in the same inhibitory rates. So it is possible that α-anordrin and probimane are calmodulin competitors with calmodulin-like binding whose actions can occur by affecting the reaction balance of substrate and product on target enzymes of calmodulin (Ca⁺⁺-Mg⁺⁺-ATPase).  相似文献   

Gravitational Perturbation of Hydrogen Spectrum in the Space Curved by Intense Laser Pulses     

Ji Peiyong Zhu Shitong * Shen Wenda 《上海大学学报(英文版)》1998,2(3):198-203

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