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This paper discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined torsion and bending loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and relative crack depths, a/D, ranging from 0.1 to 0.6 were considered. Since the loading was non-symmetrical for torsion loadings, a whole finite element model was constructed. Then, the individual and combined bending and torsion loadings were remotely applied to the model. The equivalent SIF method, F*EQ, was then used explicitly to combine the individual SIFs from the bending and torsion loadings. A comparison was then carried out with the combined SIF, F*FE, obtained using the finite element analysis (FEA) under similar loadings. It was found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results determined from the different approaches occurred when F III was involved. It was also noted that the predicted F*FE using FEA was higher than the F*EQ predicted through the equivalent SIF method due to the difference in crack face interactions.  相似文献   
2.
The effect of solute Cu and Cu precipitates on the wear behavior of ferritic iron under an unlubricated condition was investigated. The specific wear rate of Cu-containing steel abruptly decreased up to 50 N of load, and then gradually decreased with further increased load. The specific wear rate of the as-quenched specimen, in which Cu was in a solid solution, was the lowest among all the specimens at low loads, and all specimens had almost the same specific wear rate at high loads. Subsurface observation showed that the hardness increments of all specimens decreased with increased depth below the worn surface. The as-quenched specimen had a relatively large depth of deformed region than the other specimens even though the increments in hardness were almost the same for all specimens at low loads. With the same hardness at an unworn state, the as-quenched and over-aged specimens exhibited a substantial increase in hardness and large deformed regions below the worn surfaces. This finding indicated that the enhancement in plastic deformation and work hardening led to the decrease in the specific wear rate of the as-quenched specimen at low loads and the improvement in the wear resistance of all specimens at high loads.  相似文献   
3.
Although the early development of children's number sense is a strong predictor of their later mathematics achievements, it has been overlooked in primary schools in Malaysia. Mainly attributable to underdeveloped number sense of Malaysian primary and secondary school children, their inability to handle simple mathematics tasks, which require the understanding of basic mathematical concepts, numerical estimation, and mental computation, is a cause for worry. To enhance the perception of curriculum designers and mathematics teachers about why and how number sense ought to be developed, this article serves as a review of essential components, theoretical framework, and test of number sense.  相似文献   
4.
This paper reviews recent progress in electrophoretic deposition (EPD), particularly in solid oxide fuel cells (SOFCs). EPD is a simple, cost-effective, and geometrical flexible colloidal process. With its excellent control of thickness and other morphological characteristics, it is favored for the fabrication of SOFCs because each component layer of an SOFC has different requirements. However, the effectiveness of EPD is closely related to the suspension stability and EPD processing parameters. Maintaining a stable suspension and optimizing the EPD processing parameters are essential to achieve a dense and uniform deposition layer. Key parameters in maintaining the suspension stability are generally categorized into colloidal related parameters, including particle size and solid loading, and suspension media related parameters, including dielectric constant and conductivity. The effects of these parameters are often reflected by the zeta potential of the suspension, which can be manipulated by using charging agents to maintain a stable state. The deposition time and applied voltage are key parameters in optimizing the EPD process through their effects on the deposition rate. The effects of these parameters on particle surface charges and on the EPD mechanism are discussed.  相似文献   
5.
Due to the increasing workloads for supervisors and the challenges in research proposals for postgraduates, the study focused on engaging 15 postgraduates in a Malaysian public university in a peer research group. The data was collected from observations of the group meetings, video-recorded peer feedback and follow-up interviews. The qualitative analysis of the data indicates that the research group supported the postgraduates through peer feedback practices, learning how to present proposals and defend themselves and finding directions in research proposals. Although their engagement was challenged by initial reservations of some postgraduates to present their proposals and provide feedback and issues related to provision, reception and reliability of peer feedback, these challenges were minimized through mentoring and instructional strategies. While peer research groups represent a valuable pedagogical support that complement supervisors’ support to postgraduates in developing their research proposals, the value should be maximized by integrating supervisors in research groups.  相似文献   
6.
Abstract

The aims of this study were to establish the physical and physiological attributes of elite and sub-elite Malaysian male badminton players and to determine whether these attributes discriminate elite players from sub-elite players. Measurements and tests of basic anthropometry, explosive power, anaerobic recovery capacity, badminton-specific movement agility, maximum strength, and aerobic capacity were conducted on two occasions, separated by at least one day. The elite (n = 12) and sub-elite (n = 12) players' characteristics were, respectively: mean age 24.6 years (s = 3.7) and 20.5 years (s = 0.7); mass 73.2 kg (s = 7.6) and 62.7 kg (s = 4.2); stature 1.76 m (s = 0.07) and 1.71 m (s = 0.05); body fat 12.5% (s = 4.8) and 9.5% (s = 3.4); estimated VO2max 56.9 ml · kg?1 · min?1 (s = 3.7) and 59.5 ml · kg?1 · min?1 (s = 5.2). The elite players had greater maximum absolute strength in one-repetition maximum bench press (P = 0.015) compared with the sub-elite players. There were significant differences in instantaneous lower body power estimated from vertical jump height between the elite and sub-elite groups (P < 0.01). However, there was no significant difference between groups in shuttle run tests and on-court badminton-specific movement agility tests. Our results show that elite Malaysian male badminton players are taller, heavier, and stronger than their sub-elite counterparts. The test battery, however, did not allow us to discriminate between the elite and sub-elite players, suggesting that at the elite level tactical knowledge, technical skills, and psychological readiness could be of greater importance.  相似文献   
7.
This study investigates cognitive and metacognitive strategies in learning oral Arabic among students at Universiti Teknologi MARA (UiTM), Malaysia. The concept of these strategies was derived from the self-regulated learning framework, which consists of five components, namely rehearsal, elaboration, organization, critical thinking, and metacognitive strategies. The purposes of this study are to investigate the level of cognitive and metacognitive strategies used (1) among UiTM students; (2) between students with different prior experiences, namely, some of them had an experience of 5 years in learning Arabic in secondary school (abbreviated by SWE) and some of them did not have any experience at all (abbreviated by SNE); (3) between students of different gender; and (4) between students with the interaction of different gender and prior experience. The sample of this study consists of 183 students and employs a questionnaire adapted from the Motivated Strategies for Learning Questionnaire (MSLQ). The study revealed that (1) all UiTM students used cognitive and metacognitive strategies at a moderate level; (2) SWE scored significantly higher than SNE in all five components of cognitive and metacognitive strategies; (3) females scored significantly higher than males in rehearsal, organization, and metacognitive strategies; and (4) there were no statistically significant differences noted in all components between students with the interaction of prior experience and gender. This study had some classroom implications. It suggested that some improvement and changes in learning oral Arabic should be made in terms of selecting learning materials, implementing oral Arabic activities, and learning tasks, which will stimulate the use of all strategies, as well as conducting proficiency tests instead of achievement tests. Students should also be exposed to the learning techniques which used all these strategies extensively and collaborative activities may be carried out among students with mixed prior experience and gender.  相似文献   
8.
Current cognitive screening tests are difficult to use due to their deficit in cultural and conceptual significance and translation into other languages. The purpose of this study was to translate the Loewenstein Occupational Therapy Cognitive Assessment for Geriatrics (LOTCA-G) into Malay language and test its reliability and validity for assessing cognitive deficit among institutional elderly who undergo occupational therapy. The study was based on a single group test–retest design of 52 selected subjects (among the elderly). Cronbach's alpha values were used to examine the reliability of the instrument. Convergent validity was also assessed by comparing the adapted Malay version to the original English version for any inconsistencies and abnormality in interpretation. This study concluded that the Malay version of the Loewenstein Occupational Therapy Cognitive Assessment for Geriatrics is reliable as the overall Cronbach's alpha value was more than .90. This study also indicated that both the adapted Malay version and the original English versions of the instruments were consistent in their performance in cognitive components. The findings pointed out that the Malay version of the Loewenstein Occupational Therapy Cognitive Assessment for Geriatrics is appropriate and reliable in identifying deficits in cognitive components in relation to occupational performance for the Malaysian elderly population.  相似文献   
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