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Characterization of a-Si:H/SiN multilayer waveguide polarization using an optical pumping application—LED 总被引：1，自引：1，他引：0
Mohd Saiful Dzulkefly Zan Isamu Kato Mohammad Syuhaimi Ab-Rahman Seri Mastura Mustaza 《浙江大学学报(A卷英文版)》2009,10(10):1421-1427
This paper describes the fabrication of a waveguide and the analysis of its polarization characteristics by applying light-emitting diode （LED） pumping lights to its surface. By using double tubed coaxial line （DTCL） microwave plasma chemical vapor deposition （MPCVD） equipment, an a-Si：H/SiN multilayer waveguide was fabricated whose thickness could be controlled at nanometer order. The main structural material of the waveguide sample consisted of a combination of layers of amorphous silicon hydrogen and silicon nitrate. Once the sample was ready, another major objective of the experiment was to analyze the polarization characteristics of the fabricated waveguide. The idea of the experiment was to analyze how the waveguide reacts when three types of LED （blue, yellow, and red） are radiated onto its surface. The results showed that the fabrication of the a-Si：H/SiN sample is successful. Most effective transmission results, which accord with the polarization characteristics analysis, were obtained. 相似文献
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Language and theory of mind: meta-analysis of the relation between language ability and false-belief understanding 总被引：1，自引：0，他引：1
Numerous studies show that children's language ability is related to false-belief understanding. However, there is considerable variation in the size of the correlation reported. Using data from 104 studies (N=8,891), this meta-analysis determines the strength of the relation in children under age 7 and examines moderators that may account for the variability across studies--including aspect of language ability assessed, type of false-belief task used, and direction of effect. The results indicate a moderate to large effect size overall that remains significant when age is controlled. Receptive vocabulary measures had weaker relations than measures of general language. Stronger effects were found from earlier language to later false belief than the reverse. Significant differences were not found among types of false-belief task. 相似文献
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天然植物色素可以作为研制染料敏化太阳能电池的一种颜料(光敏剂)。西藏核桃果皮富含丰富色素,本文利用萃取、色谱分离技术提取了西藏林芝核桃果皮色素。用蒸馏水从500g干核桃果皮中提取获得了21.03g色素,产率达4.21%。用四氯化碳从500g鲜核桃果皮中提取获得了0.35g色素。利用紫外可见光度计对以上两种萃取流程获得的色素进行了吸光度测定。结果显示核桃果皮色素对波长越短的光吸收能力越强。紫外区有最大的吸光度,然后随着波长的增大,吸光度逐渐变小。为今后研制色素增感型太阳能电池提供了萃取色素颜料技术。 相似文献
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Amin L Ahmad J Jahi JM Nor AR Osman M Mahadi NM 《Public understanding of science (Bristol, England)》2011,20(5):674-689
Despite considerable research in advanced countries on public perceptions of and attitudes to modern biotechnology, limited effort has been geared towards developing a structural model of public attitudes to modern biotechnology. The purpose of this paper is to identify the relevant factors influencing public attitudes towards genetically modified (GM) soybean, and to analyze the relationship between all the attitudinal factors. A survey was carried out on 1,017 respondents from various stakeholder groups in the Klang Valley region. Results of the survey have confirmed that attitudes towards complex issues such as biotechnology should be seen as a multifaceted process. The most important factors predicting support for GM soybean are the specific application-linked perceptions about the benefits, acceptance of risk and moral concern while risk and familiarity are significant predictors of benefit and risk acceptance. Attitudes towards GM soybean are also predicted by several general classes of attitude. 相似文献
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ABSTRACTChronic absenteeism is often referred to as a problem hidden in plain sight (Chang & Romero, 2008). In recent years, more communities around the United States have been intentional on improving student attendance and limiting the impact of chronic absenteeism. Using qualitative interviews, we sought to understand how one community was implementing strategies to engage a variety of stakeholders in an effort to decrease chronic absenteeism. Findings suggest that when it comes to increasing attendance, districts and schools should consider partnering with organizations to leverage their expertise and knowledge. This article concludes with implications for policy and practice, and concludes with a research framework for studying solutions and interventions around chronic absenteeism. 相似文献
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Jessica L. Martin Timothy R. Hess Stacie C. Ain Dana L. Nelson Benjamin D. Locke 《Journal of College Counseling》2012,15(3):247-261
Many college counseling centers do not collect client data at each session because of perceived burdens. This study explored 55 clients’ and 16 doctoral counselor trainees’ experiences collecting and using data on client distress at each session over the course of counseling at a large public university's counseling center. Results indicated that the majority of both clients and counselors found the process convenient and clinically useful. Findings, clinical implications, and future directions are discussed. 相似文献
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Aqilah Nawwarah H.A. Rajak Dk. Nurul Najiah Pg Abu Bakar Nur Dina Azyyati Lajim Nurul Hikmatull Su’aidah Haji Kamarulzaman Siti Nur Fakhrinah Haji Karim Mohammad Nabil Almunawar 《Education and Information Technologies》2018,23(6):2341-2361
This research studies on the e-learning services acceptance in higher education institutions in Brunei Darussalam. This research has seven hypotheses, relating to independent, intermediary, and dependent variables. The independent variables include lecturer’s characteristics, design of learning contents, teaching materials, and playfulness; while the intermediary variables are perceived benefits and perceived ease of use. On the other hand, the dependent variable in this research is the intention to use e-learning. Multiple regression analysis were conducted to test the hypotheses proposed. Data analysis from this research has confirmed that the lecturer’s characteristics, teaching materials, perceived ease of use and the intention to use e-learning corresponds to the perceived benefits. Meanwhile, the design of learning content and the intention to use e-learning are positively related to the perceived ease of use and lastly, the variable playfulness is positively related to the intention to use e-learning. 相似文献
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Academic leaders in Indonesian universities share a concern about the quality of teaching and learning in common with their colleagues in Western universities. Attention to the reform of teaching immediately raises questions of strategy.
Short courses in teaching skills and curriculum development have been conducted in the past but it is argued that the continuation of these alone will not have the desired impact on quality in Indonesian universities in the short‐term. A distinctive and profoundly unsatisfactory feature of universities around the world is that the majority of teaching staff have no training or qualifications in teaching. Means of addressing this issue, and the university culture that supports it, include the creation of educational development centres to provide a continuing focus for development and change, a reconsideration of what it means to be an Indonesian academic, and the careful linking of institutional needs, planning, and change with the professional development of all staff. 相似文献