检索结果-南通市图书馆

Rietveld refinement and optical properties of srWO_4:Eu^(3+) powders prepared by the non-hydrolytic sol-gel method

Journal of Rare Earths 2015年第2期33卷 113-128页

作者： P.F.s.Pereira I.C.Nogueira E.Longo E.J.Nassar I.L.V.Rosa L.s.Cavalcante Chemistry Institute University of the State of Sao Paulo Julio de Mesquita Filho-UNESP Francisco DegniAraraquara-SP 14800-900 Brazil LIEC-Chemistry Department Federal University of Sao Carlos Via Washington Luis Km 235Sao Carlos-SP 13565-905 Brazil University of Franca-UNIFRAN Via Dr.Armando Sales de OliveiraNo.201 Franca-SP 14404-600 Brazil CCN-DQ-GERATEC University of the State of Piauí Joao Cabral 2231 P.O.Box 391Terezina PI 64002-150 Brazil

We investigated the effect of annealing time on the structure and optical properties of sr WO4：Eu^3＋ powders prepared by the non-hydrolytic sol-gel method and heat treated at 800 ℃ for 2,4,8 and 16 *** and differential thermal analyses revealed that sr WO4：Eu^3＋ powders were obtained at about 800 ℃.X-ray diffraction patterns and Rietveld refinement data confirmed that all powders had a scheelite-type tetragonal ***-Raman and Fourier transform infrared spectra indicated structural order at short range and anti-symmetric stretching vibrations of O-W-O bonds associated with tetrahedral[WO4]*** properties were investigated by ultraviolet-visible（UV-vis）diffuse reflectance,and photoluminescence（PL）data which provided the evolution of quantum efficiency（η）and lifetime（τ）.UV-vis spectroscopy evidenced intermediate energy levels within the band gap of sr WO4：Eu^3＋ *** properties validated that the Eu^3＋ electric-dipole（^5D0→^7F2）transition in PL emission spectra was dominant which proved that Eu^3＋ ions were positioned in a site without an inversion center.[（^5D0→^7F2）/（^5D0→^7F1）]band ratios showed that Eu^3＋ ions were located in a low symmetry *** PL emission,ηandτproved the dependence on the annealing time in the behavior of sr WO4：Eu3＋powders with a higher relative emission PL intensity as well as higherηandτvalues related to other samples when heat treated at 800℃ for 8 h.

关键词： srWO4 Rietveld refinement optical band gap Eu^(3+) +-rare earth luminescence

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

WEIGHTED HOLOMORPHIC BEsOV sPACEs AND THEIR BOUNDARY VALUEs

引用

Analysis in Theory and Applications 2005年第2期21卷 143-156页

作者： V.s.Guliyev University of Alabama

We study weighted holomorphic Besov spaces and their boundary values. Under certain restrictions on the weighted function and parameters, we establish the equivalent norms for holomorphic functions in terms of their b... 详细信息

关键词： holomorphic Besov space weighted Lebesgue space Poisson kernel singular integral weighted Besov space

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

China's Foreign Direct Investments:Challenges of Due Diligence and Organizational Integration

引用

Economic and Political studies 2015年第2期3卷 112-143页

作者： ABDOL s.sOOFI Economics from University of Wisconsin

This paper critically reviews Chinese companies' foreign direct investment practices of recent years. Using case studies involving overseas Greenfield as well as merger and acquisition(M&A) of Chinese enterprises, we aim to draw lessons from these experiences. However, because of increasing importance of outbound acquisitions by Chinese companies, this paper focuses on Chinese M&A activities. After presenting the theoretical discussions of post-acquisition organizational integration, this paper identifies factors that have contributed to less than expected performances of Chinese foreign investments. Three main factors are identified as the plausible causes of the less than satisfactory outcomes: inadequate due diligence, not considering political and country risks, and cultural differences. In all cases, inexperience of Chinese enterprises in foreign direct investment, either in Greenfield form or M&A, has attributed to the problems. Therefore, summing the experiences of the Chinese enterprises that have foreign direct investment is essential for those Chinese investors that intend to invest overseas. Conduct of meaningful, in-depth due diligence before serious negotiations for investment or acquisition, inclusion of risk premium for political risk in cash flow analysis, and early post-merger integration planning are essential for avoidances of bitter outcomes many Chinese investors experienced overseas.

关键词： China’s cross-border direct investment China’s M&A

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

sensitivity of UK Covid-19 deaths to the timing of suppression measures and their relaxation

引用

Infectious Disease Modelling 2020年第1期5卷 525-535页

作者： John s.Dagpunar Department of Mathematical sciences University of SouthamptonUniversity RoadSouthamptonSO171BJUnited Kingdom

In this paper I examine the sensitivity of total UK Covid-19 deaths and the demand for intensive care and ward beds,to the timing and duration of suppression periods during a 500-day *** is achieved via a sEIR *** an expected latent period of 4.5 days and infectious period of 3.8 days,R0 was first estimated as 3.18 using observed death rates under unmitigated spread and then under the effects of the total lockdown(R0-0.60)beginning 23 *** case fatality rate given infection is taken as 1%.Parameter values for mean length of stay and conditional probability of death for ICU and non-ICU hospital admissions are guided by Ferguson et al.(2020).Under unmitigated spread the model predicts around 600,000 deaths in the *** with one exposed person at time zero and a suppression consistent with an R0 of 0.60 on day 72,the model predicts around 39,000 deaths for a first wave,but this reduces to around 11,000 if the intervention takes place one week *** the initial suppression were in place until day 200 and then relaxed to an R0 of 1.5 between days 200 and 300,to be followed by a return to an R0 of 0.60,the model predicts around 43,000 *** would increase to around 64,000 if the release from the first suppression takes place 20 days *** results indicate the extreme sensitivity to timing and the consequences of even small delays to suppression and premature relaxation of such measures.

关键词： Covid-19 sEIR model Lockdown suppression Halving time Doubling time

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Growth promoting effect of microbial inoculants on Acacia nilotica grown under nursery conditions

引用

studies in Fungi 2021年第1期6卷 400-407页

作者： Dash s Gupta N Plant Pathology and Microbiology Division Regional Plant Resource CentreBhubaneswar-751015 OdishaIndia

Present study was carried out on Acacia nilotica seedlings grown under different bioinoculation treatments by using laboratory grown liquid cultures of 10 fungal isolates,11 Rhizobium isolates and 5 other bacterial *** cultures were screened for their effects on growth of Acacia nilotica grown in greenhouse *** selected microbial inoculants were assessed as considering their individual performance or in combination with the other inoculants in specific *** higher performance was shown with the combination of Penicillum chrysogenum Thom.1,B 5 bacterial isolate,R10 and/or R11 isolates of ***,it was observed that the above microbial mixed culture inoculation was promoted plant growth specifically number of leaves and the leaf ***,nursery application of mixed microbial inoculants,specifically as above could be beneficial for the production of quality planting material(QPM)of Acacia nilotica and subsequent field applications.

关键词： Acacia nilotica Aspergillus Growth Penicillium Phosphate solubilization Rhizobium

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Cadmium on the Hatching ofMetaphire posthuma Cocoons

引用

Biomedical and Environmental sciences 1999年第1期12卷 50-53页

作者： s·K·GUPTA R·C·MURTHY 等 IndustrialToxicologyResearchCentre

Earthworms are considered ideal soil organisms for use in terrestrial ecotoxicology. Due to theirsusceptibility of heavy metals, the effect of cadmium on the hatching of M. posthuma cocoons wasstudied. The hatching was observed by the water incubation method and the doses of Cd were 0,1.25, 2.5, 5.0, 10.0 and 40.0ppm. The0 and 1.25 ppm treated cocoons hatched within 45-60 days at 20℃ with 80% hatching rate and one juvenile per cocoon; no hatching was observed athigher concentrations. Furihermore, there was a linear increase in Cd residue in the treated co-coons. These results are apparently ill effects of Cd on embryonic development of the earthworms

关键词： Animals Cadmium Oligochaeta soil Pollutants

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reordberend in Old English Poetry

引用

Journal of Foreign Languages and Cultures 2019年第2期3卷 138-146页

作者： Carolyn s.Gonzalez Iowa state University

A peculiar term appears in five Old English *** term is“reordberend,”which translates to“speech-bearers”in modern *** reordberend are described in Dream of the Rood,Daniel,Andreas,the Christ poems,and *** is the defining characteristic of humanity in these poems,an intrinsic part of what it is to be ***,objects also speak in Old English poetry and therefore,the ability to express thoughts and feelings by articulating sounds is not a skill that belongs exclusively to *** often surrounds the reordberend despite the significance of speech in each *** reordberend bear speech as an ability,as the potential to carry out speech in the future;this is quite different from actively *** lack of conversation from the speech-bearers is ironic and *** how speech occupies each poem and examining the moments in which the reordberend appear in apocalyptic and prophetic Anglo-saxon poetry reveals a complicated message concerning humanity’s ability to participate in God’s activity in the world.

关键词： Old English poetry reordberend speech Dream of the Rood silence

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Do the Experimental Violations of Bell Inequalities Require a Non-Local Interpretation of Quantum Mechanics？

引用

量子光学学报 2006年第B8期12卷 66-67页

作者： Edward s. Fry Department of Physics Texas A＆M University College Station TX 77843.-4242 USA

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application of Multimedia and Internet Technology in Learning Mould Design

引用

厦门大学学报（自然科学版） 2002年第S1期41卷 295-296页

作者： simon s P shum Department of Multimedia and Internet Technology

With the use of multimedia which combines the use o f text, sound, images, motion video and animation, it is more efficient for studen ts to learn mould design interactively. A program is created using several multi media software to simulate the mechanism of moulding processes in order to let s tudents understand the concept of mould design. In addition, students can even access the program through the Internet. Therefore, the software is defined as Multimedia and Internet Technology (MIT) program. The MIT program consists of four sections: (i) simulation of mould mechanisms, ( ii) cooling system, (iii) material information and (iv) games for tutorials. sec tion One covers the basic operations of different types of moulds such as two-p late mould, three-plate mould, split mould, side-core mould and mould with und ercuts. section Two introduces different types of cooling systems such as bubble r, baffle, cooling circuits, etc. section Three provides some useful material in formation for mould design. section Four contains games of matching mould compon ents, mould design problem finding and multiple choice questions to test student s how much they understand mould design concept. Multimedia is highly effective particularly in teaching and learning. It changes the nature of learning itself. It makes reading dynamic by giving words an impo rtant new dimension. It allows students to see, hear and do simultaneously, thus significantly reducing average learning time. Furthermore, through cooperative learning on Internet, students can access the program, share data or search info rmation anytime anywhere. Therefore, Multimedia and Internet Technology is one o f the vital aspects to speed up the realization of information age in society.

关键词： Application of Multimedia and Internet Technology in Learning Mould Design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

When the People speak: Deliberative Democracy and Public Consultation Har/DVD

引用

2009年

作者： James s. Fishkin

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：