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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
Pub Date : 2013-12-01 DOI: 10.1142/S0219607713500031
T. L. Tan, L. Ng, L. C. Lim
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.
利用傅里叶变换红外光谱(FTIR)技术,在4000 ~ 400 cm-1波数范围内研究了西澳大利亚黑软玉的矿物学性质。在3700 ~ 3600 cm-1区域由于O-H拉伸模式产生的红外吸收峰可以定量分析玉石样品矿物组成中的Fe/(Fe+Mg)比值。黑色软玉的Fe/(Fe+Mg)比值高于绿色软玉,但与放线石(富铁软玉)相当。这表明黑软玉的矿物学特征更接近于放线石而不是透闪石。利用拉曼光谱在1200-200 cm-1区域对玉石进行了表征。对黑软玉的红外光谱和拉曼光谱数据与新西兰绿软玉和缅甸玉进行了比较。黑色软玉的化学成分似乎与绿色软玉略有不同。FTIR光谱和拉曼光谱技术可用于区分黑软玉、绿软玉和绿翡翠。测定了黑软玉的折射率、比重和硬度,并与绿软玉和硬玉进行了比较。
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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
Pub Date : 2013-12-01 DOI: 10.1142/S0219607713300014
Madhubrata Ghosh, G. Anand
A major goal of molecular biology is to correlate molecular structure with function. Since most enzymes and biological catalysts are proteins, the focus for correlating 'form' with 'function' has been entirely on protein macromolecular structure. It is obvious that any understanding of protein function must come through an understanding protein dynamics. Furthermore, all of the regulatory reactions are through changes in dynamics brought about by post-translational modifications, the most important of which is phosphorylation. This review highlights the important role of covalent phosphorylation and noncovalent phosphates in regulating allosteric effects and function through a study of protein dynamics. Mass spectrometry is a relatively new and increasingly important tool for describing protein dynamics. All examples described in this review have been studied by amide hydrogen/deuterium exchange mass spectrometry.
分子生物学的一个主要目标是将分子结构与功能联系起来。由于大多数酶和生物催化剂都是蛋白质,因此将“形式”与“功能”联系起来的重点完全放在蛋白质大分子结构上。很明显,任何对蛋白质功能的理解都必须通过对蛋白质动力学的理解。此外,所有的调节反应都是通过翻译后修饰带来的动力学变化,其中最重要的是磷酸化。本文从蛋白质动力学的角度综述了共价磷酸化和非共价磷酸化在调节变构效应和功能中的重要作用。质谱法是一种相对较新的、越来越重要的描述蛋白质动力学的工具。本文所述的所有例子都已通过酰胺氢/氘交换质谱法进行了研究。
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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
Pub Date : 2013-12-01 DOI: 10.1142/S021960771350002X
S. Kalaiselvi, T. L. Tan, R. Rawat, P. Lee, S. P. Heussler, M. Breese
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.
化学放大,负色调的SU-8光刻胶的使用是众多的,跨越工业,科学和医疗领域。因此,在本研究中,进行了一些初步研究,以了解使用x射线光刻技术生成图案所需的SU-8光刻胶的用量和热处理要求。本文利用同步加速器作为x射线源,对SU-8光刻胶的x射线曝光剂量、曝光后烘烤(PEB)时间和不同厚度光刻胶的温度等工艺参数进行了表征,认为SU-8光刻胶在制作高宽高比微结构方面具有一定的应用价值。利用傅里叶变换红外光谱仪(FTIR)对不同工艺参数下光刻胶分子链的交联进行了精确监测,并对结果进行了讨论。发现SU-8光刻胶光谱中914 cm-1处的红外吸收峰是表征SU-8光刻胶交联完成的有效指标。结果表明,从0 J/cm3到30 J/cm3, SU-8光刻胶的交联速率较高,此后,无论PEB时间如何,峰值几乎饱和。这是一个很好的证据,证明了SU-8光刻胶的剂量要求是有效完成交联的,而交联又是有效制备微纳结构的必要条件。在交联程度与PEB时间和温度之间也观察到类似的行为。无论PEB温度如何,经过一定时间的PEB处理后,交联速率下降。所得结果还表明,914 cm-1处峰吸收面积的变化与x射线照射剂量有一定的关系。
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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
Pub Date : 2013-12-01 DOI: 10.1142/S0219607713500043
U. Ilyas, R. Rawat, T. Tan
This paper reports the tailoring of acceptor defects in oxygen rich ZnO thin films at different post-deposition annealing temperatures (500–800°C) and Mn doping concentrations. The XRD spectra exhibited the nanocrystalline nature of ZnO thin films along with inconsistent variation in lattice parameters suggesting the temperature-dependent activation of structural defects. Photoluminescence emission spectra revealed the temperature dependent variation in deep level emissions (DLE) with the presence of acceptors as dominating defects. The concentration of native defects was estimated to be increased with temperature while a reverse trend was observed for those with increasing doping concentration. A consistent decrease in DLE spectra, with increasing Mn content, revealed the quenching of structural defects in the optical band gap of ZnO favorable for good quality thin films with enhanced optical transparency.
本文报道了在不同沉积后退火温度(500-800℃)和Mn掺杂浓度下富氧ZnO薄膜中受体缺陷的裁剪。XRD光谱显示ZnO薄膜的纳米晶性质,晶格参数变化不一致,表明结构缺陷的激活依赖于温度。光致发光光谱揭示了以受体存在为主要缺陷的深能级发射(DLE)的温度依赖性变化。随着温度的升高,天然缺陷的浓度增加,而随着掺杂浓度的增加,天然缺陷的浓度呈相反的趋势。随着Mn含量的增加,DLE光谱持续下降,表明ZnO光学带隙中的结构缺陷被淬灭,有利于形成高质量的薄膜,提高光学透明度。
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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
Pub Date : 2013-12-01 DOI: 10.1142/S0219607713500018
G. Lebron, T. L. Tan
The high-resolution Fourier transform infrared absorption spectrum of the ν2 + ν12 combination band of normal ethylene (12C2H4) in the 3050–3105 cm-1 region was recorded at a resolution of 0.0063 cm-1 and at an ambient temperature of 296 K. Upper state rovibrational analysis was carried out using a standard Watson's Hamiltonian in asymmetric reduction in Ir representation. The band center, rotational constants and centrifugal distortion constants up to quartic terms of the upper ν2 + ν12 = 1 state were determined from the final fit that included 102 infrared transitions. The root-mean-square deviation of the fit was 0.000729 cm-1.
在3050 ~ 3105 cm-1范围内,以0.0063 cm-1的分辨率记录了普通乙烯(12C2H4) ν2 + ν12组合带的高分辨率傅里叶变换红外吸收光谱,环境温度为296 K。在Ir表示中,采用不对称还原的标准沃森哈密顿量进行了上态旋转振动分析。通过102次红外跃迁的最终拟合,确定了上ν2 + ν12 = 1态的带中心、旋转常数和离心畸变常数,直至四次项。拟合的均方根偏差为0.000729 cm-1。
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引用次数: 0
Editorial — Molecular Spectroscopy and Microscopy 编辑-分子光谱学和显微镜
Pub Date : 2013-12-01 DOI: 10.1142/S0219607713020011
T. Wohland, A. T. Lee
The nine scientific societies under the aegis of the Academy are: Institute of Physics Singapore; Singapore Association for the Advancement of Science; Singapore Institute of Biology; Singapore Mathematical Society; Singapore National Institute of Chemistry; Singapore Institute of Statistics; Singapore Society for Microbiology & Biotechnology; Singapore Society for Biochemistry & Molecular Biology; and Science Teachers Association of Singapore. Editorial
新加坡科学院下属的9个科学学会是:新加坡物理学会;新加坡科学促进会;新加坡生物研究所;新加坡数学学会;新加坡国家化学研究所;新加坡统计研究所;新加坡微生物与生物技术学会;新加坡生物化学与分子生物学学会;和新加坡科学教师协会。编辑
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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
Pub Date : 2013-06-26 DOI: 10.1142/S0219607712500061
D. M. Lewis, D. Treagust, A. Chandrasegaran
This study integrated cooperative learning methods in classroom instruction to investigate the effects on achievement and conceptual change in matter concepts involving 70 fifth grade students after 10 weeks of instruction. Data obtained from the administration of two achievement tests indicated that there were significant differences between the pre-test and post-test mean scores on the Matter Unit Test as well as on the Matter Diagnostic Test. Since the notion of status is fundamental to the Conceptual Change Model (Posner, Hewson, Strike & Gertzog, 1982) this study also investigated the students' ability to determine the status of their own conceptions. Analysis of the students' use of written descriptors provided varied evidence of their ability to use technical language (intelligible, plausible, or fruitful) and effectively determine the status of their own conceptions.
摘要本研究以70名五年级学生为研究对象,在课堂教学中整合合作学习方法,探讨经过10周教学后,合作学习对学生成绩及物质概念观念转变的影响。从两个成绩测试的管理中获得的数据表明,在物质单元测试和物质诊断测试的测试前和测试后的平均分数之间存在显著差异。由于状态概念是概念变化模型的基础(Posner, Hewson, Strike & Gertzog, 1982),本研究还调查了学生确定自己概念状态的能力。对学生使用书面描述符的分析提供了各种证据,证明他们使用技术语言的能力(可理解的、合理的或富有成果的),并有效地确定他们自己概念的状态。
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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
Pub Date : 2013-06-26 DOI: 10.1142/S0219607712020016
L. Tan, R. Subramaniam
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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
Pub Date : 2013-06-26 DOI: 10.1142/S0219607712500085
Silke Mikelskis-Seifert, R. Duit
Developing teachers' ways of thinking about "good" instruction as well as their views of the teaching and learning process is generally seen as essential for improving teaching behaviour and implementation of more efficient teaching and learning settings. Major deficiencies of German physics instruction as revealed by a nationwide video-study on the practice of physics instruction are addressed. Teachers participating in the project are made familiar with recent views of efficient instruction on the one hand and develop context-based instructional settings on the other. The evaluation resulted in partly encouraging findings. However, it also turned out that a number of teachers' ways of thinking about good instruction did only develop to a somewhat limited degree. The most impressive changes occurred for teachers who enjoyed the most intensive coaching.
发展教师对“好”教学的思考方式以及他们对教学和学习过程的看法通常被视为改善教学行为和实施更有效的教学环境的必要条件。通过一项全国性的物理教学实践视频研究,指出了德国物理教学的主要缺陷。参与该项目的教师一方面熟悉了有效教学的最新观点,另一方面开发了基于情境的教学设置。评价结果部分令人鼓舞。然而,结果也表明,许多教师对良好教学的思考方式只发展到某种有限的程度。最令人印象深刻的变化发生在那些接受了最密集辅导的教师身上。
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引用次数: 4
GLOBALIZATION AND SCIENCE EDUCATION 全球化与科学教育
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
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.
全球化进程在世界范围内的经济和文化变革中发挥了重要作用。近年来,越来越多的文献从全球化的视角重新思考科学教育的研究与发展。本文从全球化的视角对科学教育研究的现状和未来发展进行了批判性的概述。主要关注两个方面。首先,批判性地分析了科学教育作为一个国际研究领域的进一步发展。研究人员似乎主要来自以英语为母语或至少是主要工作语言的国家。其次,从经济和文化全球化的角度重新思考目前占主导地位的科学教学变体的意义得到了重点关注。一方面,科学教育全球化作为一个研究领域需要考虑世界各地不同科学教育文化的丰富性。同时,发展科学教学方式,使学生认识到国际经济和文化全球化的各种优势、挑战和问题是必要的。
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引用次数: 14
期刊
Bulletin - Cosmos Club. Cosmos Club (Washington, D.C.)
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