Engaging Schooling Subjectivities Across Post-Apartheid Urban Spaces. Fataar,A. Cape Town,South Africa: Stellenbosch University Press, 2015. (paperback).     

Yunus Omar 《Educational Studies A Journal of the American Educational Studies Association》2016,52(1):78-82

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Impact of carbohydrate mouth rinsing on time to exhaustion during Ramadan: A randomized controlled trial in Jordanian men     

Mo’ath F. Bataineh  Ali M. Al-Nawaiseh  Mohammad H. Abu Altaieb  David M. Bellar  Omar S. Hindawi 《European Journal of Sport Science》2018,18(3):357-366

Mouth rinsing using a carbohydrate (CHO) solution has been suggested to improve physical performance in fasting participants. This study examined the effects of CHO mouth rinsing during Ramadan fasting on running time to exhaustion and on peak treadmill speed (V_peak). In a counterbalanced crossover design, 18 sub-elite male runners (Age: 21?±?2 years, Weight: 68.1?±?5.7?kg, VO_2max: 55.4?±?4.8?ml/kg/min) who observed Ramadan completed a familiarization trial and three experimental trials. The three trials included rinsing and expectorating a 25?mL bolus of either a 7.5% sucrose solution (CHO), a flavour and taste matched placebo solution (PLA) for 10?s, or no rinse (CON). The treatments were performed prior to an incremental treadmill test to exhaustion. Three-day dietary and exercise records were obtained on two occasions and analysed. Anthropometric characteristics were obtained and recorded for all participants. A main effect for mouth rinse on peak velocity (V_peak) (CHO: 17.6?±?1.5?km/h; PLA: 17.1?±?1.4?km/h; CON: 16.7?±?1.2?km/h; P?η_p²?=?0.49) and time to exhaustion (CHO: 1282.0?±?121.3?s; PLA: 1258.1?±?113.4?s; CON: 1228.7?±?98.5?s; P?=?.002, η_p²?=?0.41) was detected, with CHO significantly higher than PLA (P?P?P?>?.05). Energy availability from dietary analysis, body weight, and fat-free mass did not change during the last two weeks of Ramadan (P?>?.05). This study concludes that carbohydrate mouth rinsing improves running time to exhaustion and peak treadmill speed under Ramadan fasting conditions.  相似文献   

Principal change leadership competencies and teacher attitudes toward change: the mediating effects of teacher change beliefs     

Tai Mei Kin  Omar Abdull Kareem  Mohamad Sahari Nordin  Khuan Wai Bing 《International Journal of Leadership in Education》2018,21(4):427-446

This study investigates the relationship between Principal Change Leadership Competencies, Teacher Change Beliefs and Teacher Attitudes toward Change. A total of 936 teachers from 47 High Performing Secondary Schools in Malaysia completed the survey. Structural equation modelling was applied to test the models. Firstly, the results showed that Principal Change Leadership Competencies was significantly related to Teacher Change Beliefs and implied that if school principals equipped themselves with sufficient Principal Change Leadership Competencies, Teacher Change Beliefs can certainly be enhanced. Secondly, Teacher Change Beliefs was significantly related to Teacher Attitudes toward Change whereby the stronger the Teacher Change Beliefs, the greater the enhancement of Teacher Attitudes toward Change. Thirdly, Teacher Change Beliefs was indeed a total mediator in the relationship of Principal Change Leadership Competencies and Teacher Attitudes toward Change. Put simply, via Teacher Change Beliefs, the impact of Principal Change Leadership Competencies on Teacher Attitudes toward Change was relatively strong as Teacher Change Beliefs greatly facilitated the influence of Principal Change Leadership Competencies on Teacher Attitudes toward Change. Thus, in-depth enhancing Teacher Change Beliefs is one of the effective ways to increase the likelihood of teachers to embrace change. Fourthly, Principal Change Leadership Competencies was more influential than teachers’ self-influence in enhancing Teacher Attitudes toward Change. Therefore, concerted effort must be given to prioritize the continuous development of principal change leadership in effective change management. The study encourages a fresh look at change leadership development and ultimately alters the traditional approach of school principals in managing change.  相似文献   

基于PLC和Visual Basic的串行通信技术的实现     

吾买尔.吐尔逊  张德虎  张占  严继松 《中国科技信息》2008,(5):119-121

监控系统对工业生产非常重要,可编程控制器PLC和可视化程序设计语言Visual Basic以其优越的性能应用到这一领域。在Visual Basic与PLC串行通信的基础上,实现了PLC对发电机电网频率的测试和对集水井水位的控制,并开发了基于Visual Basic的监控系统。  相似文献   

Bond graph formulation of an optimal control problem for linear time invariant systems   总被引：1，自引：0，他引：1  

Wilfrid Marquis-Favre  Omar Mouhib 《Journal of The Franklin Institute》2008,345(4):349-373

A recent communication has proposed a conjectural procedure for representing a category of optimal control problems in bond graph language [W. Marquis-Favre, B. Chereji, D. Thomasset, S. Scavarda, Bond graph representation of an optimal control problem: the dc motor example, in: ICBGM’05 International Conference of Bond Graph Modelling and Simulation, New Orleans, USA, January 23-27, 2005, pp. 239-244]. This paper aims at providing a fundamental theory for proving the effectiveness of this procedure. The class of problem that the procedure can deal with has been extended. Its application was formerly restricted to linear time invariant siso system. The systems considered now are linear time invariant mimo systems. The optimization objective is the minimization of dissipation and input. The developments concerning the optimal control problem are based on the Pontryagin maximum principle and the proof of the effectiveness of the procedure makes a broad use of the port-Hamiltonian concept. As a result, the bond graph representation of the given optimization problem enables the analytical system, which provides the optimal solution, to be derived. The work presented in this paper is the first step in research with perspectives towards formulating dynamic optimization problems in bond graph and, towards coupling this formulation with a sizing methodology using bond graph language and a state-space inverse model approach. This sizing methodology, however, is not the topic of this paper and thus is not presented here.  相似文献   

The LRXs-RALFs-FER module controls plant growth and salt stress responses by modulating multiple plant hormones     

Chunzhao Zhao  Wei Jiang  Omar Zayed  Xin Liu  Kai Tang  Wenfeng Nie  Yali Li  Shaojun Xie  Yuan Li  Tiandan Long  Linlin Liu  Yingfang Zhu  Yang Zhao  Jian-Kang Zhu 《国家科学评论(英文版)》2021,8(1):35-50

Salt stress is a major environmental factor limiting plant growth and productivity. We recently discovered an important new salt tolerance pathway, where the cell wall leucine-rich repeat extensins LRX3/4/5, the RAPID ALKALINIZATION FACTOR (RALF) peptides RALF22/23 and receptor-like kinase FERONIA (FER) function as a module to simultaneously regulate plant growth and salt stress tolerance. However, the intracellular signaling pathways that are regulated by the extracellular LRX3/4/5-RALF22/23-FER module to coordinate growth, cell wall integrity and salt stress responses are still unknown. Here, we report that the LRX3/4/5-RALF22/23-FER module negatively regulates the levels of jasmonic acid (JA), salicylic acid (SA) and abscisic acid (ABA). Blocking JA pathway rescues the dwarf phenotype of the lrx345 and fer-4 mutants, while disruption of ABA biosynthesis suppresses the salt-hypersensitivity of these mutants. Many salt stress-responsive genes display abnormal expression patterns in the lrx345 and fer-4 mutants, as well as in the wild type plants treated with epigallocatechin gallate (EGCG), an inhibitor of pectin methylesterases, suggesting cell wall integrity as a critical factor that determines the expression pattern of stress-responsive genes. Production of reactive oxygen species (ROS) is constitutively increased in the lrx345 and fer-4 mutants, and inhibition of ROS accumulation suppresses the salt-hypersensitivity of these mutants. Together, our work provides strong evidence that the LRX3/4/5-RALF22/23-FER module controls plant growth and salt stress responses by regulating hormonal homeostasis and ROS accumulation.  相似文献   

Pre-service teachers’ difficulties in reasoning about sampling variability     

Abu-Ghalyoun  Omar 《Educational Studies in Mathematics》2021,108(3):553-577

Educational Studies in Mathematics - Past studies have documented some pre-service teachers’ (PSTs) difficulties in reasoning about sampling variability. This study adds to the body of...  相似文献   

Relationship between teachers' change in attitudes toward science and some professional variables     

Omar E. Hasan  Victor Y. Billeh 《科学教学研究杂志》1975,12(3):247-253

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The Efficacy of the LearningRx Cognitive Training Program: Modality and Transfer Effects     

Oliver W. Hill  Zewelanji Serpell  M. Omar Faison 《Journal of Experimental Education》2016,84(3):600-620

This article describes two studies testing the efficacy of a commercial one-on-one cognitive training program (LearningRx) and its computer-based version (Brainskills) in laboratory and school settings. Study 1 tested Brainskills in a laboratory setting with 322 middle school students. Paired t-tests revealed significant gains on all cognitive measures and math performance after 3 weeks of training. Study 2, a randomized control study, included 225 high school students randomly assigned to one of three conditions: LearningRx, Brainskills, or study hall (control) in a school setting for a 15-week training period. Univariate ANCOVAs revealed significantly higher scores for the treatment groups compared with controls on working memory, logic and reasoning, and three of four math attitude measures but not for math performance. Implications for school-based interventions are discussed.  相似文献   

Postgraduate conception of research methodology: implications for learning and teaching     

Ben Daniel  Vijay Kumar  Noritah Omar 《International Journal of Research & Method in Education》2018,41(2):220-236

This qualitative inquiry investigates postgraduate students’ conceptions of research methodology and how it contributes to their learning. It explores factors likely to motivate student choice of research methodology and challenges in understanding research methods. The research was carried out at research-intensive universities in New Zealand and in Malaysia with similar postgraduate programmes. Participants were enrolled in Masters and Ph.D. programmes. Findings revealed that participants share a recognition that research methodology is a significant body of knowledge in postgraduate education. However, there were noticeable differences in perspectives regarding what constitutes research methodology and whether or not it should be conceived as a discipline. To some participants, learning research methodology is less of a discipline but rather an acquisition of a set of isolated facts and skills without necessarily acquiring a deeper understanding of research. Furthermore, postgraduate students choose research methodology based on a number of factors such as familiarity with a method, methodological orientation of the primary supervisor, the domain of study, and the nature of research problems pursued. Participants reported that the key challenges they face in understanding research methodology include framing research questions, understanding the theory or literature and its role in shaping research outcomes, and difficulties in performing data analysis.  相似文献