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Junaidi Syarif Agung Iswadi Mariyam Jameelah Ghazali Zainuddin Sajuri Mohd Zaidi Omar 《浙江大学学报(A卷英文版)》2013,14(12):906-914
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
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Mohammad Abd-Alrahman Mahmoud Abushariah Raja Noor Ainon Roziati Zainuddin Assal Ali Mustafa Alqudah Moustafa Elshafei Ahmed Othman Omran Khalifa 《Journal of The Franklin Institute》2012,349(7):2215-2242
This paper presents our work towards developing a new speech corpus for Modern Standard Arabic (MSA), which can be used for implementing and evaluating Arabic speaker-independent, large vocabulary, automatic, and continuous speech recognition systems. The speech corpus was recorded by 40 (20 male and 20 female) Arabic native speakers from 11 countries representing three major regions (Levant, Gulf, and Africa). Three development phases were conducted based on the size of training data, Gaussian mixture distributions, and tied states (senones). Based on our third development phase using 11 hours of training speech data, the acoustic model is composed of 16 Gaussian mixture distributions and the state distributions tied to 300 senones. Using three different data sets, the third development phase obtained 94.32% and 8.10% average word recognition correctness rate and average Word Error Rate (WER), respectively, for same speakers with different sentences (testing sentences). For different speakers with same sentences (training sentences), this work obtained 98.10% and 2.67% average word recognition correctness rate and average WER, respectively, whereas for different speakers with different sentences (testing sentences) this work obtained 93.73% and 8.75% average word recognition correctness rate and average WER, respectively. 相似文献
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Zamzami Zainuddin Corinne Jacqueline Perera 《Journal of Further & Higher Education》2019,43(1):115-126
This study aimed at identifying the differences between a flipped classroom and a non-flipped classroom instructional model, based on the Self-Determination Theory (SDT). This study employed a mixed-method research approach, using post-tests, questionnaires and focus group interviews during the data collection process. Sixty-one students were the respondents involved in a non-randomised experiment with a control group design, while 10 representative students participated in a focus-group discussion. The results reported that post-test 1 showed no significant difference between the two groups of flipped and non-flipped classroom instruction (t = 1.68, p = .474), while post-tests 2 and 3 were significantly different (t = 5.54, p = .007 < .05) and (t = 10.17, p = .001 < .05). This finding shows that students in the flipped learning environment were more competent handling online tasks and activities, and were able to control their learning outcomes. The survey results showed that the flip-class setting fostered better peer interaction and autonomous learning skills among the students. The flip-class environment had also a positive influence on students’ intrinsic motivation. The qualitative findings from the students’ interviews revealed that students were motivated by the video-recorded lectures, self-regulated learning environments, engagement in class activities and peer interaction. Conclusions from this study showed that the flip-class setting had successfully established the basic psychological needs of SDT, namely: competency, autonomy and relatedness in a flipped classroom model. 相似文献
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