Medieval and renaissance glass technology in Valdelsa (Florence). Part 1: raw materials, sands and non-vitreous finds     

U. Casellato  F. Fenzi  P. Guerriero  S. Sitran  P. A. Vigato  U. Russo  M. Galgani  M. Mendera  A. Manasse 《Journal of Cultural Heritage》2003,4(4):337-353

A significant number of archaeological finds of the 13th–16th century from the Tuscan sites of Germagnana and Gambassi in Valdelsa—FI, was studied by different physico-chemical investigations (SEM–EDS, ICP, Mössbauer spectroscopy, XRD, XRF, TG-DTA) in order to contribute to clarify the production methodology and the pre-industrial glass manufacture technology. The studied samples are mainly non-vitreous finds as production waste, refractory materials, crucibles and raw materials; also vitreous finds as frits, skims, glasses (glass masses, glass working waste and finished products) have been taken into consideration. The obtained petrographic and physico-chemical data strongly suggest that both Gambassi and Germagnana glass manufactures were strictly connected with the sources of vitrifiable materials, situated in Tuscan sand quarries. In particular a comparison between sands from the neighbouring quarries and appropriate finds of the two archaeological sites evidences that the employed vitrifiable materials possibly belong to La Casina La Cava resort. The archaeological classification, based on macroscopic observation and stratigraphic position, was compared and verified with the scientific classification of the examined finds of Germagnana and Gambassi sites based on their composition, morphology and physico-chemical properties.  相似文献   

Understanding the Information Needs of Academic Scholars in Agricultural and Biological Sciences   总被引：4，自引：0，他引：4  

Pali U. Kuruppu  Anne Marie Gruber   《The Journal of Academic Librarianship》2006,32(6):609-623

This study investigates the information needs of faculty and graduate students in agricultural and biological sciences. Qualitative research methods, interviews and focus groups, were used to examine what types of information these scholars need for their research, teaching and learning, how they seek that information, and perceptions. The implications for library service are discussed.  相似文献   

In vitro study on ribozyme against hepatitis C virus     

Chen Zhi  Liu Yong  Liu Ke-zhou  R. H. Dennin  Dou Jun  U Reinhard 《浙江大学学报(A卷英文版)》2001,2(1):100-103

Objective: To determine the effective nucleotide sites of ribozymes against HCV, and obtain a highly effective, nontoxic and inexpensive antisense ribozyme specific for HCV. Methods: Two effective ribozymes, targeted to HCV 5’NC region and C region, were designed and synthesized. Eukaryotic expression vectors, pSV2-gpt. CD-SR (, containing either HCRZNC or HCRZC were constructued and transfected into MT-2 cells, which had been infected by HCV. Quantitative PCR and hydridization were used to determine the effect of inhibition of HCV by ribozymes. Results: HCRZNC and HCRZC suppressed the replication of HCV by 54.7% and 62.1%, respectively. Furthermore, when both ribozymes were cotransfected into cells, they suppressed replication by 78.8%. Conclusion: Two specific antisense ribozymes have strong inhibitory effects on the replication of HCV in cultured cells, and have better effect when used together.  相似文献   

The effects of electronic portfolio tools on online students' perceived support and cognitive load   总被引：1，自引：0，他引：1  

Craig E. Shepherd  Doris U. Bolliger 《The Internet and Higher Education》2011,14(3):142-149

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The computer revolution: friend or foe to FE college staff     

Elfneh U. Bariso 《British journal of educational technology : journal of the Council for Educational Technology》2003,34(1):85-88

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我国专科教育现状分析及发展战略构想     

吕炳君 《沧州师专学报》2002,18(1):44-46

本首先分析了当前我国专科教育所面临的发展困境与成因，进而提出了改革我国专科教育体制、建立新型专科教育运行机制的构想与相关的政策性建议。作认为，作为高等教育的一个重要组成部分，专科教育为我国的社会主义教育事业作了重要贡献，但目前又进入到一个新的发展转型期，挑战与发展的机遇关存；改革计划管理的约束的体制，寻求办学效益和社会效益的统一，建立起与社会主义市场经济体制相适应的专科教育体制与机制，实现教育体制与学校功能的战略性调整，是现阶段专科教育改革发展的必然趋势和重要条件。  相似文献   

Cultural problems in minority education: Their interpretations and consequences—Part one: Theoretical background     

John U. Ogbu 《The Urban Review》1995,27(3):189-205

Culture has featured prominently in minority educational research, policies, and intervention since the early 1960s. It is receiving even more attention today in minority education discourse due to the emergence of cultural diversity and multicultural education as popular national issues. A careful analysis of the new discourse suggests, however, that the issue has shifted from how cultural differences enhance or deter the school adjustment and academic performance of minority children to the problem of cultural hegemony and representation in school curriculum and other domains of education. But cultural diversity and multicultural education are only a partial solution to the problems of culture in minority education. This essay is in two parts. In part one I argue for a reconsideration of the earlier question about how culture affects minority school adjustment and academic performance. I also proposecultural frame of reference as a new level of analysis of the cultural problems that confront minority students at school. In part two I illustrate my points with two case studies from Minority Education Project in Oakland, California.  相似文献   

Evaluation of ovulisa: An indigenous ELISA kit for detection of ovulation     

G. M. Sankolli  M. I. Khatkhatay  M. P. Desai  D. K. Pardhe  P. C. Ishrad  U. M. Joshi 《Indian journal of clinical biochemistry : IJCB》1992,7(1):71-74

Aprototype kit for the detection of occurrence of ovulation based on urinary pregnanediol glucuronide estimations by ELISA was developed in our laboratory. This kit was sent for evaluation at 4 centres in Bombay and Pune, India. The diagnosis of ovulation/anovulation based on the results of the kit is comparable with that based on reference parameters commonly used (ultrasonography of ovarian follicles and serum progesterone estimations). The accuracy of the test was 93.5%, specificity was 87.5% and sensitivity was 95.7%. This rapid indigenous test can be very useful in assessing ovulatory status of the woman by the clinicians in their offices.  相似文献   

A biochemical study on the effect of Riboflavin on cataractous rat lenses. II Proteins and Glutathione     

Rita R. Vani  U. M. Rawal 《Indian journal of clinical biochemistry : IJCB》1994,9(2):96-97

Proteins and glutathione (GSH) levels were estimated in the experimental groups. Levels of both proteins and glutathione in the control and the treated groups were found to be significantly decreased compared to the normal group. The results show that supplementation of riboflavin has beneficial effect by alleviating the oxidant injuries to GSH and proteins, which are involved in the maintenance of transparency and protection of thiol groups of the lens. Thus, riboflavin has an active role in the lens metabolism and has a potential to improve the metabolic activity of the cataractous lenses.  相似文献   

我国各地区现代化进程研究   总被引：4，自引：0，他引：4  

田杰  吴殿廷  李雁梅  武聪颖 《中国软科学》2002,(6):98-101

本文根据国际通行的现代化指标体系计算了中国大陆31个省市区的各项现代化指标的重分，采用主成分分析法和聚类分析法评估了各省市区的现代化水平及其分级和分类特征，并在此基础上分析了我国现代化水平的整体特点及地域分异特点。  相似文献