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81.
Median noise barriers, like parallel noise barriers, can be employed to reduce the impact of traffic on roadside communities via the direct propagation path. The performance of different shapes of median barriers was compared using reactive and passive surfaces and a 2D boundary element method (BEM). In the case of reactive surfaces, quadratic residue diffusers (QRDs) and primitive root diffusers (PRDs) were used on the top and stem surfaces of median barriers. To introduce passive barriers, two different absorbent materials including fibrous material and a grass surface with flow resistivity of 20 000 and 2500 kg/(s·m2), respectively, were similarly applied. The effect of thin absorptive barriers was similar at lower frequencies and better at mid and high frequencies to that of their equivalent rigid barriers. More improvement was achieved by covering the top surface of thick barriers with grass rather than with fibrous material. The performance of QRD and PRD barriers where the diffuser was located on the top surface was more frequency dependent than that of barriers coated with fibrous material. A comparison of the average A-weighted insertion loss in the thick barriers showed that the greatest improvement (2.59 dB (A)) was achieved using a barrier of 30-cm thickness covered with grass. 相似文献
82.
Student populations in higher education in Australia and elsewhere in the developed world have experienced significant diversity over the past two decades. The existing literature has provided limited clarity about the effects of this diversity on the dimensions underpinning students' study philosophy domain. Based on a large data set from a leading Australian university, this paper analyses students' study philosophy, beliefs and attitudes towards teaching and learning. Factor analysis explored themes (or dimensions) within the survey. Multivariate analysis of variance used these dimensions as dependent variables with age, sex, ethnicity, study discipline, study level, academic performance and sex/ethnicity interaction as grouping variables to identify significant sources of variations. Deep learning, expediency and responsibility reflected the students' study philosophy domain. Deep learning and responsibility varied with ethnicity and academic performance. Expediency differed according to ethnicity, study discipline and academic performance. Students in business-related disciplines displayed greater expediency than peers elsewhere, treating education like any other commodity. The contribution of this study lies in its rigorous analysis of the impact of the diversity of the student population on the study philosophy domain, compared to the existing literature. 相似文献
83.
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
84.
Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature 总被引:2,自引:0,他引:2
Khakwani AA Shiraishi M Zubair M Baloch MS Naveed K Awan I 《Journal of Zhejiang University. Science. B》2005,6(5):389-395
INTRODUCTION Rice (Oryza sativa L.) is one of the most im-portant crops in Pakistan. It is the third largest crop interms of area and production after wheat and cotton.Although rice in Pakistan is consuming large acreage,Pakistan is still far behind other rice producingcountries. The average yield is very low (2 t/ha) ascompared to Egypt (8.4 t/ha) and USA (6.6 t/ha).There are many reasons for this low yield. The mostimportant are high temperature (40?50 °C), low hu-midity at … 相似文献
85.
AbstractThe purpose of this paper is to examine librarians' perceptions of knowledge management, including its concept, potential applications, benefits and major challenges of its applications in Indian academic libraries. A structured questionnaire, containing both open and close-ended questions, was sent by postal mail to 30 librarians of academic libraries in India of which 15 questionnaires were returned. Respondents were asked to define knowledge management and answer questions on its potential applications, benefits and major challenges of implementation in academic libraries. Respondents were also allowed to specify their own views on the subject. The findings of the study show that the levels of understanding of KM concepts among librarians are varied and most of them view KM as the management of information resources, services and systems using technology or specific processes for the capture and use of explicit knowledge, rather sharing and using tacit knowledge. They have positive attitudes towards the applications of knowledge management into academic library practice, and not only because this can bring academic libraries closer to their parent organization, but also because it may help them to survive in an increasingly challenging environment. Although, librarians in the present study acknowledged that they are involved in the practices of knowledge management but these were perceived as basic information management activities. Lack of understanding of knowledge management concepts and its benefits, knowledge sharing culture, top management commitment, incentives and rewards, financial resources and information technology infrastructure are perceived as the major barriers for incorporating knowledge management into academic library practice. 相似文献
86.
87.
An extended discrete particle swarm optimization algorithm for the dynamic facility layout problem 总被引:2,自引:0,他引:2
Hassan Rezazadeh Mehdi Ghazanfari Mohammad Saidi-Mehrabad Seyed Jafar Sadjadi 《浙江大学学报(A卷英文版)》2009,10(4):520-529
We extended an improved version of the discrete particle swarm optimization (DPSO) algorithm proposed by Liao et al.(2007) to solve the dynamic facility layout problem (DFLP). A computational study was performed with the existing heuristic algorithms, including the dynamic programming (DP), genetic algorithm (GA), simulated annealing (SA), hybrid ant system (HAS), hybrid simulated annealing (SA-EG), hybrid genetic algorithms (NLGA and CONGA). The proposed DPSO algorithm, SA, HAS, GA, DP, SA-EG, NLGA, and CONGA obtained the best solutions for 33, 24, 20, 10, 12, 20, 5, and 2 of the 48 problems from (Balakrishnan and Cheng, 2000), respectively. These results show that the DPSO is very effective in dealing with the DFLP. The extended DPSO also has very good computational efficiency when the problem size increases. 相似文献
88.
A. Aziz Khater Ahmad M. El-Nagar Mohammad El-Bardini Nabila M. El-Rabaie 《Journal of The Franklin Institute》2018,355(14):6390-6415
In this paper, an adaptive Takagi–Sugeno (T–S) fuzzy controller based on reinforcement learning for controlling the nonlinear dynamical systems is proposed. The parameters of the T–S fuzzy system are learned using the reinforcement learning based on the actor-critic method. This on-line learning algorithm improves the controller performance over the time, which it learns from its own faults through the reinforcement signal from the external environment and tries to reinforce the T–S fuzzy system parameters to converge. The updating parameters are developed using the Lyapunov stability criterion. The proposed controller is faster in learning than the T–S fuzzy that parameters learned using the gradient descent method under the same conditions. Moreover, it is able to handle the load changes and the system uncertainties. The test is carried out based on two mathematical models. In addition, the proposed controller is applied practically for controlling a direct current (DC) shunt machine. The results indicate that the response of the proposed controller has a good performance compared with other controllers. 相似文献
89.
The effect of student teaching experience on preservice elementary teachers’ self-efficacy beliefs for technology integration in the UAE 总被引:1,自引:0,他引:1
Hamed Mubarak Al-Awidi Iman Mohammad Alghazo 《Educational technology research and development : ETR & D》2012,60(5):923-941
This study examines the effect of the student teaching experience on preservice elementary teachers?? self-efficacy beliefs and the sources of their beliefs about technology integration in teaching in the UAE. The participants were 62 pre-service elementary teachers at the United Arab Emirates University. Pre- and post-survey was administered to examine participants?? self-efficacy beliefs for technology integration prior to and at the end of the teaching experience. Additionally, a purposeful subset of the sample (n?=?16) were interviewed based on their high self-efficacy belies to explore the sources of the high self-efficacy beliefs. Results showed a significant effect of student teaching experiences on participants?? judgment of their self-efficacy about technology integration. Mastery experience and vicarious experience reported to be the most influential sources of self-efficacy to integrate technology among preservice elementary teachers. 相似文献
90.
This paper addresses the issue of how games can reshape education by describing current educational practices. It argues that there are conservative camps that emphasize structure and development of basic literacy and numeracy skills in education as well as liberal camps that emphasize immersion, and notices that both camps fail to train students able to address the crisis of innovation. A post-progressive pedagogy that integrates both structure and immersion to address this innovation crisis is described in the paper. It is also emphasized that epistemic games can serve as excellent tools at the hand of this post-progressive pedagogy. 相似文献