Effect of deposition parameters on mechanical properties of TiN films coated on 2A12 aluminum alloys by arc ion plating (AIP)     

AWAD Samir Hamid 《重庆大学学报(英文版)》2005,4(1)

1 Introduction Weight saving materials such as aluminum and its alloys are becoming increasingly important and have been attracting increasing attention over the past decade, specially in the automotive, aerospace and chemical industries, and electrical devices because of their high strength-to-weight ratio, high electrical and thermal conductivities, processability and recyclability and good resistance to degradation in some corrosive environments [1,2]. In the automotive industry, there is d…  相似文献   

Policies of global English tests: test-takers’ perspectives on the IELTS retake policy     

M. Obaidul Hamid 《Discourse: Studies in the Cultural Politics of Education》2016,37(3):472-487

Globalized English proficiency tests such as the International English Language Testing System (IELTS) are increasingly playing the role of gatekeepers in a globalizing world. Although the use of the IELTS as a ‘policy tool’ for making decisions in the areas of study, work and migration impacts on test-takers' lives and life chances, not much is known about its own policy and policy logic. With the growing call for listening to test-takers' voices, specific policy aspects of the test have recently been scrutinized. This article seeks to contribute to this area by drawing on test-takers' perspectives on the IELTS retake policy and developing an understanding of how policies of global English tests are perceived, interpreted and given new meanings by its key stakeholders. Although the truth-value of the emic views of test-takers may be debated, their experiences and perceptions problematize the reliability claims of the testing agency by locating commercial motives at the center of their policy and thereby raising theoretical, professional and ethical questions.  相似文献   

The benefits of educational technology. Roshd,magazine of educational technology,by mohammad reza afzalnia. 1988, vol. 4, no. 2, pp. 772–774     

M. Reza Afzalnia 《Educational technology research and development : ETR & D》1990,38(3):93-94

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Using Computer Assisted Instruction to Compare the Inventive Model and the Radical Constructivist Approach to Teaching Physics     

Rezaei  Ali Reza  Katz  Larry 《Journal of Science Education and Technology》2002,11(4):367-380

This paper introduces a new way of evaluating instructional strategies by using computers. Two basic theories, instructivism and constructivism, are discussed and critically evaluated in terms of their effectiveness in conceptual learning. Despite the current popularity of constructivism, the radical form of it is criticized in this paper. The advantages and limitations of these two approaches, especially the radical forms of constructivism, are outlined. After borrowing some ideas from other effective conceptual change models, an integrative model for conceptual learning (the Inventive Model) is introduced. Two versions of multimedia physics software are developed by the authors. The first version is based on the Inventive Model and the second version based on a radical constructivist model. The effectiveness of the Inventive Model was compared with the radical constructivist approach and conventional science instruction. Students' log files were analyzed to investigate the nature and the processes of the conceptual change. A conceptual test and a knowledge test were used to compare the groups. The quantitative results showed the superiority of the Inventive Model over the other models in conceptual learning and the superiority of conventional instruction in learning the basic knowledge. The qualitative analysis showed that only the Inventive Model lead to coherent conceptual learning. It was concluded that the process of conceptual change is gradual and continuous. Analysis of students' log files revealed no moments of dramatic change in students' conceptions.  相似文献   

The art of self-making: identity and citizenship education in late-modernity     

Reza Gholami 《British Journal of Sociology of Education》2017,38(6):798-811

Taking the English National Curriculum as its main example, this article argues that an overly nationalistic, normative and ‘fact-based’ citizenship education curriculum is failing to engage the dimensions of young people’s identities which they experience as deeply meaningful. There is thus a chasm – albeit a false one – between official discourses and pedagogies of citizenship and what young people consider to be their ‘real’ selves. I argue that citizenship education must develop a more sophisticated understanding of the complexities of how identities are formed and performed, especially in light of globalisation and increasing migration. I also make a somewhat unorthodox argument for conceptualising ‘relating-to-otherness’ in the same way that we think of music consumption. This has implications for how we experience, interpret, value and create ‘others’. The article also makes some recommendations for how these ideas can begin to be implemented in educational settings.  相似文献   

Assessing industry's needs: Business requirements versus classroom preparations     

Reza T. Ahmadi 《Assessment Update》1996,8(2):6-7

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The spread of private tutoring in English in developing societies: exploring students’ perceptions     

M. Obaidul Hamid  Asaduzzaman Khan  M. Monjurul Islam 《Discourse: Studies in the Cultural Politics of Education》2018,39(6):868-886

ABSTRACT

Although research on private tutoring has gained visibility in recent years, private tutoring in English (PT-E) has not received notable attention. This paper examines students’ perceptions of PT-E in Bangladesh in terms of its necessity and helpfulness, peer pressure in PT-E participation and ethicality of PT-E practice and government intervention. Our analysis of survey data (N?=?572) leads to characterising PT-E and explaining the reasons for its popularity. As a popular learning space beyond formal schooling, PT-E is available in various forms and quality catering to the purchasing power of different social groups. We argue that students may resort to PT-E not because of its proven effectiveness but because of their declining faith in school English teaching. The paper contributes to our understanding of the complex interactions between the curricular (school) and non-curricular (PT-E) settings and family socioeconomic resources in the teaching of English as a globally desired language.  相似文献   

Data-based modeling and estimation of vehicle crash processes in frontal fixed-barrier crashes     

Zuolong Wei  Kjell G. Robbersmyr  Hamid R. Karimi 《Journal of The Franklin Institute》2017,354(12):4896-4912

As a complex process, vehicle crash is challenging to be described and estimated mathematically. Although different mathematical models are developed, it is still difficult to balance the complexity of models and the performance of estimation. The aim of this work is to propose a novel scheme to model and estimate the processes of vehicle-barrier frontal crashes. In this work, a piecewise model structure is predefined to represent the accelerations of vehicle in frontal crashes. Each segment in the model is corresponding to the energy absorbing component in the crashworthiness structure. With the help of Ensemble Empirical Mode Decomposition (EEMD), a robust scheme is proposed for parameter identification. By adjusting the model structure and parameters according to the initial velocity, crash processes in different conditions are estimated effectively. The estimation results exhibit good agreement with finite element (FE) simulations in three different cases. It is shown that, the proposed model keeps low complexity. Furthermore, the structure information of vehicle is involved in improving the accuracy and ability of crash estimation.  相似文献   

Florida public hurricane loss model: Research in multi-disciplinary system integration assisting government policy making     

Shu-Ching Chen  Min Chen  Na Zhao  Shahid Hamid  Kasturi Chatterjee  Michael Armella 《Government Information Quarterly》2009

Homeowner insurance rate making is an important public policy issue in the State of Florida. The State of Florida has over 2 trillion dollars of residential properties exposed to hurricane risk. The State has declared that it shall adopt public policy to encourage the use of sophisticated actuarial methods to assure that consumers are charged lawful insurance rates (Section 627.0628(1)(a)). To that effect, the State's insurance regulatory agency, the Florida Office of Insurance Regulation (OIR), sponsored the development of a Florida Public Hurricane Loss Model (FPHLM) to assess the risk and project insured residential losses. The FPHLM is an open and public model that has been developed primarily by university experts without influence from either the insurance industry or the state regulators. It is open to public scrutiny and provides an understandable baseline to check the assumptions as well as the outputs of the proprietary models. The FPHLM thus makes the rate evaluation process more objective and less political. It enables the state to justify rejecting or accepting rate increases based on an independent and transparent model, rather than a process that can be influenced politically. As a multi-disciplinary large scale research project with an iterative and incremental development cycle, the FPHLM system development and integration faced numerous challenges varying from technical factors to project management aspects. This paper will discuss the research experiences accumulated during the development of the FPHLM and the impact it has had on the homeowner insurance rate filing process in the State of Florida.  相似文献   

The impact of electronic media on faculty evaluation     

Reza Barkhi  Paul Williams 《Assessment & Evaluation in Higher Education》2010,35(2):241-262

With the proliferation of computer networks and the increased use of Internet‐based applications, many forms of social interactions now take place in an on‐line context through Computer‐Mediated Communication (CMC). Many universities are now reaping the benefits of using CMC applications to collect data on student evaluations of faculty, rather than using paper‐based surveys in Face‐To‐Face (FTF) classroom settings. While the relative merits of CMC versus FTF student evaluations have been researched extensively, there is limited research published about the ways students respond to the questions from either mode of data collection. This paper reports on a research study to analyse the communication differences between student scores from FTF student evaluations and CMC evaluation questions from end of semester evaluations from a university in the Middle East region. In addition to the questions about communication mode differences between two evaluation questions, several demographic variables were measured to determine any interaction effects. The results of our study suggest that the type of communication channel mitigates the responses that students make on CMC evaluations vis‐à‐vis FTF evaluations of faculty. In particular, even though there were significant differences found at the aggregate level between CMC and FTF evaluations, when the course and instructor are controlled for, there were no significant differences reported. In addition, several differences were noted depending on the type and level of the course being studied. Also, we found that students are more likely to express more extreme responses to scale questions in CMC than FTF evaluations. Administrators should consider these potential differences when implementing on‐line evaluation systems.  相似文献