Bücher von Mohamed Ibrahim

Informed by the cognitive theory of multimedia learning, this study examined the effects of three multimedia design principles on undergraduate students¿ learning outcomes and perceived learning difficulty in the context of learning entomology from an educational video. The principles were segmenting the video into smaller units, signaling to direct students¿ attention to relevant information, and weeding to remove any nonessential content (SSW). This study used a between-subjects design to measure the effect of SSW (independent variables) on four dependent variables: perceived learning difficulty, knowledge retention, transfer of knowledge, and structural knowledge acquisition. Prior knowledge and metacognitive awareness were included in the model as covariates. Results of the study demonstrate that participants in the SSW group outperformed the non-SSW group on the tests of knowledge transfer and structural knowledge acquisition and reported lower levels of learning difficulty. These findings support the use of segmenting, signaling, and weeding to help novice learners organize and integrate knowledge from complex, dynamic audio-visual media like video.

Gabel Nusab El Balgum is located in the northern part of Bir Safsaf Area Southwestern Desert, Egypt (about 600 km southwest of Aswan City) and covers an area of about 40 km2. A few workers have investigated the Nusab El Balgum Area from the mineralogical and geochemical point of view. The area consists mainly of Devonian sandstone, PermöTriassic volcanic rocks, altered granitic rocks and post-granitic dykes. The altered granitic rocks (silici¿ed and kaolinized) have undergone several hydrothermal alteration processes and were subjected to different types of alteration (hematitization, carbonatization, kaolinization, sericitization and silici¿cation) and are characterized by extreme enrichment in rare metals (such as Zr, Nb, Y and REEs). Bastnaesite, parisite, fergusonite, columbite, hydrothermal zircon, monazite and xenotime are common in the silici¿ed and kaolinized granites

This book describes novel hardware security and microfluidic biochip design methodologies to protect against tampering attacks in cyberphysical microfluidic biochips (CPMBs).