检索结果-南通市图书馆

Synthesis and Luminescence Properties of Pr^(3+) Doped Ca_xBa_(1-x)TiO_3 (0.3≤x<1) Fine Particles

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2009年第5期24卷 689-693页

作者：何声太 College of Materials Science and Engineering Tianjin Polytechnic University

CaxBa1-xTiO3 （CBT） fine particles doped with red luminescence center of Pr3＋ ions （Pr： CBT） were successfully synthesized by salt assisted spray pyrolysis （SASP） process. Scanning electronic microscope （SEM） and laser scattering analysis demonstrate that salt can be removed from the surface of particles by washing with Milli-Q water and the particles can be further separated by ball-milling to get well-dispersed Pr^3＋ ions doped CBT fine particles. The luminescence properties, such as photoluminescence （PL） and mechanoluminescence （ML）, of as-synthesized Pr： CBT particles were investigated. For Pr： CBT fine particles with different Ca molar ratios, all the samples show one emission at 612 nm, with increasing Ca molar ratio, PL intensity of Pr： CBT fine particles become stronger and stronger. When pressure was loaded on the Pr： CBT pellet, mechanoluminescence（ML） emission was measured. The results show that the ML intensity is proportional to the applied pressure.

关键词： synthesis luminescence mechanoluminescence photoluminescence Pr^3+ doped CaxBa1-xTiO3 fine particles

在线全文

学校读者我要写书评

暂无评论

动态环境下的单元化制造的数学建模

同济大学学报（自然科学版） 2003年第5期31卷 581-585页

作者：马玉敏陈炳森张为民同济大学CIMS研究中心上海200092 同济大学现代制造技术研究所上海200092

单元构建的数学建模是单元化制造研究中的一个研究热点 .针对以往研究中存在的不足 ,建立了动态环境下的单元化制造的数学模型 ,在所建模型中融入了零件的工艺柔性 ,并且考虑了零件需求的不确定性 ,使模型在实际应用中更具有指导意义 .

关键词：单元化制造数学建模动态环境

Production of Poly(3-Hydroxybutyrate)by Fed-Batch Culture of Alcaligenes Eutrophus at Phosphorus Limitation in 50 L fermenter

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 1999年第4期7卷 368-371页

作者：李红旗沈忠耀 ParkByungGeon ChangYongKeun ChangHoNam DepartmentofChemicalEngineering TsinghuaUniversityBeijing100084 BioprocessEngineeringresearchcenterandDepartmentofChemicalEnineering KoreaAdvancedInstituteofScienceandTechnologyTaejon305-701Korea

Poly(3-hydroxybutyrate) (PHB) is an intracellular carbon and energy storage material accumulated by many kinds of microorganism under unfavorable growth conditions. For the production of PHB, Alcaligenes eutrophus has been widely used because it is easy to grow, and its physiological and biochemical changes during the PHB synthesis is understood in details. A very high concentration and productivity of PHB could be obtained by fed-batch culture of Alcaligenes eutrophus with phosphate limitation in 50 L fermenter.

关键词： poly(3-hydroxybutyrate) Alcaligenes eutrophus scale-up fermentation

T1 theorem for Besov and Triebel-Lizorkin spaces

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2005年第5期48卷 657-665页

作者： DENG Donggao & HAN Yongsheng Department of Mathematics, Zhongshan university, Guangzhou 510275, China Department of Mathematics, Auburn university, Alabama, 36849, usa Dept. of Math. Zhongshan Univ. Guangzhou 510275 China Dept. of Math. Auburn Univ. Alabama 36849 United States

Using the discrete Calderon type reproducing formula and the PlancherelPolya characterization for the Besov and Triebel-Lizorkin spaces, the T1 theorem for the Besov and Triebel-Lizorkin spaces was proved.

关键词： T1 theorem Besov and Triebel-Lizorkin spaces Calderon reproducing formula Plancherel-Polya inequalities.

STUDY ON THE INFRARED TRANSMITTING As_2Te_3-BASED CHALCOHALIDE GLASSES

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 1995年第2期10卷 64-69页

作者：李新菊赵宏声陈文梅尹宏兵赵修建 WUHAN UNIV TECHNOL ADV MAT RES INSTDEANS OFFWUHAN 430070PEOPLES R CHINA WUHAN UNIV TECHNOL ADV MAT RES INSTOPT FIBER SENSORS RES CTRWUHAN 430070PEOPLES R CHINA

This paper reports the formation and some properties of a new class of chalcohalide glasses in the As2Tef iodide systems. The As2Te3-Pb12, As2Te3-HgI2, As2Te3-CitI and As2Te3-AgI systems can form stable bulk glasses in wide composition regions ?and no bulk glass formation was found in the As2Te3-TH sys-tem. As2Te3-based glasses have glass transition tempera-

关键词： As2Te3-based glasses Chalcohalide Iodides. Glass formation and Glass properties.

The progress of study on pathogenesis in ovarian cancer

在线全文

学校读者我要写书评

暂无评论

沈阳药科大学学报 2008年第S1期25卷 70-71页

作者： JI Yu-bin1,2,3,LI Hai-jiao1,YU Lei1,2,3,LIU Guang-da1,PANG Lin-lin1,YANG Hai-fan1(1.center of research and Development on Life Sciences and Environmental Sciences,Harbin university of Commerce,Harbin 150076,China 2.Institute of Materia Medica and Postdoctoral Programme of Harbin university of Commerce,Harbin 150076,China 3.Engineering research center of Natural Anticancer Drugs,Ministry of Education,Harbin 150076,China)

Ovarian cancer is one of the three malignant tumors in female reproductive system,the death rate locates in the first place of gynecological *** patients are already at the advanced stage when examine their bodies,five-year survival rate are only about 20% to 30%.So gynecological cancer has become one of tumor which the most waiting to be *** happens refer to the incidence of chromosomal abnormalities,cancer gene *** inactivation of tumor suppressor gene,inhibitor of apoptosis and other genetic changes,the imbalance in the regulatory network due to the interaction of multiple genes and their *** abnormalities play an important role in the development of ovarian cancer,the chromosomes of common characteristic and non-random changes are 1,3,5,6,7,8,11,12,15,17,18,20,22 *** gene including K-ras,c-erb-B2/HER-2,D1(CyclinD1),AIB1 etc.K-ras coded protein p21 is activated through point mutation,cause the enzyme activity deprivation of GMP,slowed down the speed of GTP degrdn into GMP,activate target molecule persistently,make cells proliferate persistently,then leading to ***-2 gene amplification result in the over expression of HER-2 protein,made cells over proliferate,Protein over expression convey the strong signal of proliferation,over activate the early transcription factor and certain gene in the nuclear,then promote the occurrence of *** D1 promote cells enter from S to Gl phase,thus contribute to the proliferation of cell division,then ***1 gene over express,will cause tumor cells *** suppressor gene,such as BRCA1、p53、p73、p16 *** expression depl of BRCA1 protein in ovarian Cystadenocarcinoma prompt that the reduction of BRCA1 protein synthesis,resulting in apoptosis decreased,the cell proliferation disinhibit,then disorder and proliferate,thus leading to cancer.p53 mutation happened in about 30 percents to 80 percents of ovarian cancer patients.p73 play a role in the tumor

关键词： ovarian cancer pathogenesis gene

Determination of Selenium Speciation in Selenium-enriched Corn and Yeast by HPLC-UV-HG-AFS

在线全文

学校读者我要写书评

暂无评论

Determination of Selenium Speciation in Selenium-enriched Co...

Lorenz混沌系统的近似有限时间稳定控制

第一届硒与环境和人体健康国际会议

作者： Wei Wang~(1 2) Houqi Liu~2 Yuanyuan Zhu~(1 2) Shoufeng Liu~2 Shoubiao Zhou~3 and Xuebin Yin~(1 2*) 1 advanced Laboratory of Environmental research and Technology Joint advanced research center USTC-CityU Suzhou 215123 China 2 Environment Science Division School of Earth and Space Science university of Science and Technology of China Hefei 230026 China 3 College of Life Science Anhui Normal university Wuhu 241000 China

＜正＞Introduction Selenium（Se） toxicity and nutrition depends on its total amount and chemical speciation presented in ***,organic Se can be more easily absorbed by organisms including *** containing Se and Se-met,Se-cys are the appropriate chemical forms for human daily intake from foods （Wang et al.,2000;Chen et al.,2007）.Up to now, Se-enriched yeast is used widely in China as supplement in feedstuff and in *** this study, corn flour collected from high Se area-Enshi and Se-enriched yeast were *** aim of this paper was to study their Se speciation in Se-enriched corn and yeast.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

物理学报 2011年第10期60卷 15-23页

作者：赵建利王京魏伟北京科技大学高效轧制国家工程研究中心北京100083

针对Lorenz混沌系统,研究其有限时间稳定控制问题.考虑系统存在不确定非线性,提出一种可使受控Lorenz系统实现近似有限时间稳定的控制方法.改进并设计一种扩张状态观测器,解决了受控Lorenz系统中不确定非线性未知问题.通过引入奇异扰动... 详细信息

针对Lorenz混沌系统,研究其有限时间稳定控制问题.考虑系统存在不确定非线性,提出一种可使受控Lorenz系统实现近似有限时间稳定的控制方法.改进并设计一种扩张状态观测器,解决了受控Lorenz系统中不确定非线性未知问题.通过引入奇异扰动性理论,分析了闭环系统的近似有限时间稳定性.仿真实验结果验证了该控制方法及扩张状态观测器的有效性.

关键词： Lorenz混沌系统近似有限时间稳定扩张状态观测器奇异扰动

Study of capacitive coupling effect and decoupling technology in frequency domain IP

在线全文

学校读者我要写书评

暂无评论

Study of capacitive coupling effect and decoupling technolog...