Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.)最新文献_第3页

STUDIES ON NEPHRITE AND JADEITE JADES BY FOURIER TRANSFORM INFRARED (FTIR) AND RAMAN SPECTROSCOPIC TECHNIQUES 傅里叶变换红外(ftir)和拉曼光谱技术对软玉和硬玉的研究

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-12-01 DOI: 10.1142/S0219607713500031

T. L. Tan, L. Ng, L. C. Lim

{"title":"STUDIES ON NEPHRITE AND JADEITE JADES BY FOURIER TRANSFORM INFRARED (FTIR) AND RAMAN SPECTROSCOPIC TECHNIQUES","authors":"T. L. Tan, L. Ng, L. C. Lim","doi":"10.1142/S0219607713500031","DOIUrl":"https://doi.org/10.1142/S0219607713500031","url":null,"abstract":"The mineralogical properties of black nephrite jade from Western Australia are studied by Fourier transform infrared (FTIR) spectroscopy using both transmission and specular reflectance techniques in the 4000–400 cm-1 wavenumber region. The infrared absorption peaks in the 3700–3600 cm-1 region which are due to the O–H stretching mode provides a quantitative analysis of the Fe/(Fe+Mg) ratio in the mineral composition of jade samples. The Fe/(Fe+Mg) percentage in black nephrite is found to be higher than that in green nephrite, but comparable to that of actinolite (iron-rich nephrite). This implies that the mineralogy of black nephrite is closer to actinolite than tremolite. The jade is also characterized using Raman spectroscopy in the 1200–200 cm-1 region. Results from FTIR and Raman spectroscopic data of black nephrite jade are compared with those of green nephrite jade from New Zealand and jadeite jade from Myanmar. Black nephrite appears to have a slightly different chemical composition from green nephrite. Spectra from FTIR and Raman spectroscopic techniques were found to be useful in differentiating black nephrite, green nephrite, and green jadeite jades. Furthermore, data on refractive index, specific gravity, and hardness of black nephrite jade are measured and compared with those of green nephrite and of jadeite jade.","PeriodicalId":80753,"journal":{"name":"Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.)","volume":"23 1","pages":"47-56"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82001076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

PROTEIN DYNAMICS IN PHOSPHORYLATION-MEDIATED ALLOSTERY PROBED BY AMIDE EXCHANGE MASS SPECTROMETRY 酰胺交换质谱法探测磷酸化介导变构的蛋白质动力学

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-12-01 DOI: 10.1142/S0219607713300014

Madhubrata Ghosh, G. Anand

引用次数: 0

FTIR SPECTROSCOPIC STUDIES ON CROSS LINKING OF SU-8 PHOTORESIST su-8光刻胶交联的红外光谱研究

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-12-01 DOI: 10.1142/S021960771350002X

S. Kalaiselvi, T. L. Tan, R. Rawat, P. Lee, S. P. Heussler, M. Breese

{"title":"FTIR SPECTROSCOPIC STUDIES ON CROSS LINKING OF SU-8 PHOTORESIST","authors":"S. Kalaiselvi, T. L. Tan, R. Rawat, P. Lee, S. P. Heussler, M. Breese","doi":"10.1142/S021960771350002X","DOIUrl":"https://doi.org/10.1142/S021960771350002X","url":null,"abstract":"The usage of chemically-amplified, negative tone SU-8 photoresist is numerous, spanning industrial, scientific and medical fields. Hence, in this study, some preliminary studies were conducted to understand the dosage and heat treatment requirements of the SU-8 photoresist essential for pattern generation using X-ray lithography. In this work, using Synchrotron as the X-ray source, SU-8 photoresist was characterized for X-ray lithography in terms of its process parameters such as X-ray exposure dose, post exposure bake (PEB) time and temperature for various photoresist thicknesses which is considered worthwhile in view of applications of SU-8 for the fabrication of very high aspect ratio micro structures. The process parameters were varied and the resultant cross linking of the molecular chains of the photoresist was accurately monitored using a Fourier Transform Infra-Red (FTIR) spectrometer and the results are discussed. The infrared absorption peak at 914 cm-1 in the spectrum of the SU-8 photoresist was found to be a useful indicator for the completion of cross linking in the SU-8 photoresist. Results show that the cross linking of the SU-8 photoresist is at a higher rate from 0 J/cm3 to 30 J/cm3 after which the peak almost saturates regardless of the PEB time. It is a good evidence for the validation of dosage requirement of SU-8 photoresist for effective completion of cross linking, which in turn is a requirement for efficient fabrication of micro and nano structures. An analogous behavior was also observed between the extent of cross linking and the PEB time and temperature. The rate of cross linking declines after a certain period of PEB time regardless of PEB temperature. The obtained results also show a definite relation between variation of the absorbance area of the peak at 914 cm-1 and the X-ray exposure dose.","PeriodicalId":80753,"journal":{"name":"Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.)","volume":"9 1","pages":"37-46"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89552450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

SPECTROSCOPIC STUDY OF DEEP LEVEL EMISSIONS FROM ACCEPTOR DEFECTS IN ZnO THIN FILMS WITH OXYGEN RICH STOICHIOMETRY 用富氧化学计量学研究ZnO薄膜中受体缺陷的深能级发射

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-12-01 DOI: 10.1142/S0219607713500043

U. Ilyas, R. Rawat, T. Tan

引用次数: 0

HIGH-RESOLUTION FOURIER TRANSFORM INFRARED SPECTRUM OF THE ν2 + ν12 BAND OF ETHYLENE (12C2H4) 乙烯(12c2h4) ν2 + ν12波段的高分辨率傅里叶变换红外光谱

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-12-01 DOI: 10.1142/S0219607713500018

G. Lebron, T. L. Tan

引用次数: 0

Editorial — Molecular Spectroscopy and Microscopy 编辑-分子光谱学和显微镜

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-12-01 DOI: 10.1142/S0219607713020011

T. Wohland, A. T. Lee

引用次数: 1

Fifth Grade Students Engaged in a Cooperative Learning Environment: Evaluating Their Ability to Determine the Status of Their Own Conceptions about Matter 参与合作学习环境的五年级学生:评估他们确定自身物质概念状态的能力

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-06-26 DOI: 10.1142/S0219607712500061

D. M. Lewis, D. Treagust, A. Chandrasegaran

引用次数: 3

Message from Guest Editors — COSMOS Special Issue on Science Education 《宇宙》科学教育特刊特邀编辑寄语

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-06-26 DOI: 10.1142/S0219607712020016

L. Tan, R. Subramaniam

引用次数: 0

PHYSICS TEACHERS' PROFESSIONAL DEVELOPMENT IN THE PROJECT "PHYSICS IN CONTEXT" “情境中的物理”项目下物理教师的专业发展

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-06-26 DOI: 10.1142/S0219607712500085

Silke Mikelskis-Seifert, R. Duit

引用次数: 4

GLOBALIZATION AND SCIENCE EDUCATION 全球化与科学教育

Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.) Pub Date : 2013-06-26 DOI: 10.1142/S021960771250005X

J. Bencze, Lyn Carter, M. Chiu, R. Duit, S. Martin, Christina Siry, J. Krajcik, Namsoo Shin, Kyunghee Choi, Hyunju Lee, Sungwon Kim

{"title":"GLOBALIZATION AND SCIENCE EDUCATION","authors":"J. Bencze, Lyn Carter, M. Chiu, R. Duit, S. Martin, Christina Siry, J. Krajcik, Namsoo Shin, Kyunghee Choi, Hyunju Lee, Sungwon Kim","doi":"10.1142/S021960771250005X","DOIUrl":"https://doi.org/10.1142/S021960771250005X","url":null,"abstract":"Processes of globalization have played a major role in economic and cultural change worldwide. More recently, there is a growing literature on rethinking science education research and development from the perspective of globalization. This paper provides a critical overview of the state and future development of science education research from the perspective of globalization. Two facets are given major attention. First, the further development of science education as an international research domain is critically analyzed. It seems that there is a predominance of researchers stemming from countries in which English is the native language or at least a major working language. Second, the significance of rethinking the currently dominant variants of science instruction from the perspectives of economic and cultural globalization is given major attention. On the one hand, it is argued that processes concerning globalization of science education as a research domain need to take into account the richness of the different cultures of science education around the world. At the same time, it is essential to develop ways of science instruction that make students aware of the various advantages, challenges and problems of international economic and cultural globalization.","PeriodicalId":80753,"journal":{"name":"Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.)","volume":"128 1","pages":"139-152"},"PeriodicalIF":0.0,"publicationDate":"2013-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74083857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14