Remarks on the tensor degree of finite groups

The present paper is a note on the tensor degree of finite groups, introduced recently in literature. This numerical invariant generalizes the commutativity degree through the notion of nonabelian tensor square. We show two inequalities, which correlate the tensor and the commutativity degree of finite groups, and, indirectly, structural properties will be discussed.Comment: 5 pages; to appear with revisions in Filoma

An adaptive educational system that caters for combination of two models of learning styles

This thesis aimed to explore the affect of combining two models of learning styles (VARK, and Honey and Mumford) in terms of students‘ learning gains and satisfaction. VARK focuses on how the students perceive learning, while Honey and Mumford examines how an individual would like to learn. A web-based educational system was built to test the combination of the two models of learning styles. A study to examine the feasibility of the system was carried out on 129 participants to explore whether the system presented tutorials according to their individual learning styles. A second study to investigate learning gains and user satisfaction was carried out on 149 participants. Satisfaction was divided into three main concepts: usability, preference and perception of learning. Learning gains were tested by giving participants a pre-test, a post-test and a confirmatory test. Participants were divided into four groups and had the lesson presented according to one learning style of either the VARK or Honey & Mumford model, both of the participants‘ learning styles or with no personal customization. The results found that participants who used the two models of learning styles showed higher learning gains and had higher levels of satisfaction across all three factors; compared to those using only one or no learning style. Furthermore, those using only one learning style showed higher learning gains and had higher levels of satisfaction than those with no learning style. The application of these findings would be of benefit to educational institutions‘ decision makers, educators, students and e-learning designers. Adaptation is a key feature of the system of research. It is intended for future work; preliminary research has shown that the users profile and learning item will change over time. This important finding is worth exploring in future research

Incidence rate of non-Hodgkin's lymphomas among males in Saudi Arabia: an observational descriptive epidemiological analysis of data from the Saudi cancer registry, 2001-2008

Background: This study describes epidemiological data of non-Hodgkin's lymphoma (NHL) diagnosed from 2001 to 2008 among Saudi men. Materials and methods: Retrospective data from all NHL cancer cases among Saudi men recorded in the Saudi Cancer Registry (SCR) between January 2001 and December 2008 were used. Descriptive statistics, analysis of variance, Poisson regression, and simple linear regression were also used. Results: In total, 2,555 new cases of NHL were recorded between January 2001 and December 2008. The region of Riyadh, Saudi Arabia had the highest overall age-standardized incidence rate (ASIR) at 7.8, followed by the Eastern region at 6.8, and Makkah at 6.1 per 100,000 men; however, Jazan, Hail, and Baha had the lowest average ASIRs at 2.5, 3.7, and 3.9 per 100,000 men, respectively. The incidence-rate ratio for the number of NHL cases was significantly higher in Riyadh (4.68, 95 confidence interval CI 4.11-5.32), followed by Makkah (4.47, 95% CI 3.94-5.07), and the Eastern region of Saudi Arabia (3.27, 95% CI 2.90-3.69) than that in the reference region of Jazan. Jouf had the highest changes in the ASIRs of NHL among Saudi men from 2001 and 2008 (5.0 per 100,000 men). Conclusion: A significant increase in the crude incidence rate and ASIR for NHL in Saudi Arabia between 2001 and 2008 was found. Riyadh, the Eastern region, and Makkah had the highest overall ASIR in Saudi Arabia. Jazan, Hail, and Baha had the lowest rates. Additionally, Riyadh, Makkah, and the Eastern region had the highest incidence-rate ratio for the number of NHL cases. Finally, Jouf had the highest changes in crude incidence rate and ASIR from 2001 to 2008. Further analytical studies are needed to determine the potential risk factors of NHL among Saudi men. © 2014 Alghamidi et al

Corrosion Fatigue Crack Growth Behavior At Notched Hole In 7075-T6 Under Different Biaxial Stress Ratios

This thesis presents the results of a study to quantify the effects of biaxial loading on fatigue crack behavior in both air and saltwater (3.5% NaCl) environments from pre-cracked notched circular hole in a 7075-T6 cruciform specimen using a fracture mechanics approach. With stress ratio of R = 0.5, the crack growth behavior was investigated under fatigue loading with 0.5, 0, -0.5, and -1 biaxial stress ratio lambda. The crack propagation was monitored using optical microscopy. Finite Element Analysis was performed using the different stress ranges and stress ratios with various crack sizes to compute of stress intensity factors (delta K) at the crack tips. It was observed from the study that negative biaxiality has a very pronounced effect on the crack growth rate. The crack propagates faster with negative biaxiality and also the saltwater environment accelerates the crack propagation due to corrosion

Using Concept MappingPattern Matching to Develop a Conceptual Framework for Successful Transition of First Year Saudi Students into Postsecondary Education

This study identified the future ideal functions of PYP and developed a conceptual framework for the program at King Saud University. Four research questions were answered in this study including: 1) Using the Concept Mapping/Pattern Matching methodology, how do Saudi male and female postsecondary stakeholders conceptualize the future ideal functions of Preparatory Year Deanship to help students successfully transition into their first year of college/university?; 2) Does this Concept Mapping/Pattern Matching conceptualization compare and contrast with the current working model of the Preparatory Year Program at King Saud University?; 3) Does this Concept Mapping/Pattern Matching conceptualization compare and contrast with King Saud University\u27s explicit strategic plan?; and 4) When conducting a Concept Mapping/Pattern Matching conceptualization, how do the results for males compare and contrast with the results for females?;The Concept Mapping/Pattern Matching methodology advanced by (Trochim 1989a, 1989b; Kane & Trochim, 2007) utilized for data collection and analyzing. Fourteen male including 2-PYP students, 1-Medicine College Faculty, 1-Business Administration College Faculty, 1-Engineering College Faculty, 4-PYP Faculty, 1-Academic Advising Faculty at PYP, 1-Students Affairs Faculty at KSU, 1- Students Affairs at PYP, and 2-Educational Company and nine female including 3-PYP\u27 students, 1- Pharmacy College Faculty, 2-PYP Faculty, 2-Parents, and 1-Educational Company participated in two separate brainstorming sessions. The male participants generated 48 statements and the female group generated 36 statements. The participants in each group sorted the generating statements individually into groups and rated them based on a five-point scale for relative importance and institutional efficacy.;For each group male/female the Multidimensional Scaling and Hierarchical Cluster Analysis were conducted to create various concept maps, the final one being a seven-cluster and six-cluster concept map for male and female, respectively, representing the stakeholders\u27 conceptualization of the field being studied. Following the creation of the concept maps for each group, the resulting priorities and their conceptualization schema were both compared and contrasted to the current working model of PYP and the explicit strategic plan of KSU (KSU2030) for similarities and differences in a qualitative document analysis. The male and female perceptions were also compared and contrasted.;The study revealed three main dimensions for developing PYP at KSU including Organizational design and structure, Pedagogical functionality, and Student services. Further, seven foundational principles may be embraced to develop the three dimensions previously mentioned including: 1) adopting a talent philosophy to first meet student\u27s needs and then the institution\u27s mission; 2) a flexible PYP model to meet individual student\u27s needs; (3) applying a pedagogical on theory-based; (4) reorganizing PYP\u27s tasks and centralizing student\u27s services; (5) involving KSU\u27s colleges; (6) supporting non- filtering program; and (7) adopting self-operation. The significance of this study for the educational policymaker, planner, and developer, is that the findings can be used as a model to make student\u27s transition into postsecondary education successful