排序方式： 共有9条查询结果，搜索用时 16 毫秒
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Renawi Abdulrahman Alnajjar Fady Parambil Medha Trabelsi Zouheir Gochoo Munkhjargal Khalid Sumaya Mubin Omar 《Education and Information Technologies》2022,27(4):4753-4770
Education and Information Technologies - Monitoring students' attention and engagement levels in classrooms are critical in promoting an interactive teaching process. Therefore, in addition to... 相似文献
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Usama Umer Jaber Abu Qudeiri Mohammad Ashfaq Abdulrahman AL-Ahmari 《浙江大学学报(A卷英文版)》2016,17(11):873-885
Chip morphology predictions in metal cutting have always been challenging because of the complexity of the various multiphysical phenomena that occur across the tool-chip interface. An accurate prediction of chip morphology is a key factor in the assessment of a particular machining operation with regard to both tool performance and workpiece quality. Although finite element (FE) models are being developed over the last two decades, their capabilities in modeling correct material flow around the tool tip with shear localization are very limited. FE models with an arbitrary Lagrangian Eulerian (ALE) approach are able to simulate correct material flow around the tool tip. However, these models are unable to predict any shear localization based on material flow criteria. On the other hand, FE models with a Lagrangian formulation can simulate shear localization in the chip segments; they need to make use of a mesh-based chip separation criterion that significantly affects material flow around the tool tip. In this study a mesh-free method viz. smoothed particles hydrodynamics (SPH) is implemented to simulate shear localization in the chip while machining hardened steel. Unlike other SPH models developed by some researchers, this model is based on a renormalized formulation that can consider frictional stresses along the tool-chip interface giving a realistic chip shape and material flow. SPH models with different cutting parameters are compared with the traditional FE models and it has been found that the SPH models are good for predicting shear localized chips and do not need any geometric or mesh-based chip separation criteria. 相似文献
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We investigated relations between 4- and 7-year-olds’ (N = 58) autobiographical memory and their use of self-regulatory private speech in a non-mnemonic context (a cognitive planning task). Children's use of self-regulatory private speech during the planning task was associated with longer autobiographical narratives which included specific rather than general memories and which were recalled with greater narrative cohesion and more evaluative information. Children's use of private speech that served no regulatory function was unrelated to all memory variables. The relations between self-regulatory private speech and autobiographical memory were independent of children's age, general verbal ability, and gender. Our findings are discussed in the context of the social interaction perspective on autobiographical memory development. 相似文献
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From passive to active: The impact of the flipped classroom through social learning platforms on higher education students' creative thinking 
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下载免费PDF全文 Abdulrahman M Al‐Zahrani 《British journal of educational technology : journal of the Council for Educational Technology》2015,46(6):1133-1148
This study aimed to investigate the impact of the flipped classroom on the promotion of students' creative thinking. Students were recruited from the Faculty of Education at King Abdulaziz University in Saudi Arabia during the first semester of 2014. A multiple method research design was used to address the research questions. First, a two‐group quasi‐experimental design was implemented. The first group utilised the lecture‐based strategy (n = 28), while the second group utilised the flipped classroom (n = 27). Second, a survey questionnaire was distributed to assess the students' views about the flipped classroom, its role in the promotion of creativity and the difficulties students experienced with this strategy. The findings suggest that the flipped classroom may promote students' creativity, especially with regard to fluency, flexibility and novelty. Furthermore, the students viewed the flipped classroom as an approach that may significantly facilitate their creativity. However, several difficulties were associated with the flipped classroom, especially the students' limited preparation for this strategy. Accordingly, students must be prepared to utilise the flipped classroom and be provided with adequate e‐learning tools. In addition, it is important to consider students' study load and to provide meaningful in‐class activities. 相似文献
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Abdulrahman Essa Al Lily 《The Information Society》2013,29(5):407-413
This article investigates the possibility that many users of the mobile phone communication apps communicate with one another but do not necessarily convey or receive any information, that is, anything that informs. A qualitative and quantitative investigation was carried out in Saudi Arabia, looking at how informative the messages were that Saudi society exchanged over mobile phone communication apps. The main finding was that a large number of the messages exchanged among Saudi users conveyed no actual information or only trivial information. In other words, with the increasing ease of digital communication, users may overuse technology merely to communicate for the sake of communication, with no interest in actually being informed by anything, thus suffering from “information thinness.” 相似文献
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