3D Woven Composites: From Weaving to Manufacturing

Manufacturing near-net shape preforms of fibre-reinforced composites has received growing interest from industry. Traditionally, a preform was made from 2D fabrics, but recently, it has been shown that 3D textiles can be used with success; with weaving being the predominant technology for carbon fibre composites. In 3D weaving, weft, warp and binder fibres run across, along and through the fabrics in the X, Y and Z directions, respectively. Producing a unitised single-piece fabric and subsequently reducing the takt time required for rapid composite manufacturing are two of the main advantages of using 3D woven preforms. Weaving of 3D fabrics, manufacturing of 3D composites, physical characterisation and mechanical testing of infused composites samples are discussed in this chapter. Finally, a large automotive composite made of single-piece 3D woven preform was manufactured and presented for demonstration

Experimental and numerical study on the aerodynamics and stability characteristics of a canard aircraft

Modern day fighter aircrafts are mostly canard configured because of its advantages over conventional configuration. The primary objective of this work is to investigate the low speed aerodynamic and stability characteristics of a canard configured aircraft. Using CFD -ANSYS Fluent package, numerical flow simulations were carried out for a typical canard configuration such as Burt Rutan’s VariEze, a composite homebuilt canard aircraft. To validate the numerical results, wind tunnel testing of a scaled model was carried out. Finally the effect of horizontal location of canard on the aerodynamics and stability characteristics was studied

Brain lateralization and self-reported symptoms of ADHD in a population sample of adults:A dimensional approach

Many clinical studies reported a compromised brain lateralization in patients with Attention-Deficit/Hyperactivity Disorder (ADHD) without being conclusive about whether the deficit existed in the left or right hemisphere. It is well-recognized that studying ADHD dimensionally is more controlled for comorbid problems and medication effects, and provides more accurate assessment of the symptoms. Therefore, the present study applied the dimensional approach to test the relationship between brain lateralization and self-reported ADHD symptoms in a population sample. Eighty-five right-handed university students filled in the Conners’ Adult ADHD Rating Scales and performed a lateralization reaction time task. The task consists of two matching conditions: one condition requires nominal identification for letters tapping left hemisphere specialization (Letter Name-Identity condition) and the other one requires physical and visuospatial identification for shapes tapping right hemisphere specialization (Shape Physical-Identity condition). The letters or shapes to be matched are presented in left or right visual field of a fixation cross. For both task conditions, brain lateralization was indexed as the difference in mean reaction time between left and right visual field. Linear regression analyses, controlled for mood symptoms reported by a depression, anxiety and stress scale, showed no relationship between the variables. These findings from a population sample of adults do not support the dimensionality of lateralized information processing deficit in ADHD symptomatology. However, group comparison analyses showed that subjects with high level of inattention symptoms close to or above the clinical cut-off had a reduced right hemisphere processing in the Shape Physical-Identity condition

Evaluation of The Living Escherichia coli-O78 Deleted aroA Vaccine Against Homologous and Heterologous E. coli Challenge in Broiler Chickens

To determine whether the immunization using commercially available living Escherichia coli-O78 aroA deleted vaccine (Poulvac®E. coli) is protective against APEC challenges or not. Ninety chicks were divided into six groups (15 birds/each); two groups were vaccinated at day 1 by spray and drinking routes then challenged intratracheally with homologous E. coli O78 at day 21, the other two groups were similar to the previously mentioned groups but challenged with heterologous E. coli O1 in parallel with the four challenged-vaccinated groups there were two positive control (challenged-not vaccinated) groups; one challenged with O78 and the other one with O1 at day 21 using intratacheal route. The best obtained results were recorded to the vaccinated-challenged group with the homologous strain and vaccinated by spraying method which exhibited decreases in organ lesion scores in comparison to the other groups (non-vaccinated challenged chickens and groups of chickens either homologous challenged-vaccinated through drinking water or heterologous challenged-vaccinated groups). These findings suggest that vaccine is a suitable for minimizing lesion scores against homologous challenge using spraying method that could lead to minimizing the time for treatment and cases of condemnation in processing plants

A hidden cause of infertility in hypothyroid patients

Methylene tetrahydrofolate reductase (MTHFR) gene mutations could be the cause of infertility in hypothyroid patients. Hence, it is worthy to screen for MTHFR gene mutations in infertile hypothyroid females and their partners if infertility persists after optimizing thyroid function

Perceptions of library and information science community towards open source software adoption in libraries of Oman

This paper undertake a focus group research approach to investigate the perceptions of LIS community towards open source software adoption in libraries of Oman. The motivation of the study comes as a result of E-Oman strategy to uplift the information and communication technology services in Oman. The focus group approached applied in this study was carried out by means of inviting participants from seven institutions in Oman, to participate in a workshop about OSS adoption in libraries. During the workshop, focus groups were established. After the workshop, each group participates in responding to their perception towards OSS adoption in libraries. The results of their responses were analyzed. It was discovered that there are lack of awareness and readiness toward adoption of open source software in libraries of Oman

The implementation of social accountability in medical schools in Eastern Mediterranean region:A scoping review

Objectives: Social Accountability is a relatively new approach in medical education, Information about its implementation is scarce in the Eastern Mediterranean Region. The objective of this scoping review was to investigate the patterns and trends in reporting the social accountability (SA) of medical schools in the Eastern Mediterranean region (EMR). Methods: Using the Arksey and O'Malley approach, we conducted literature searches between 1995 and 2022 in the following databases: Scopus, Web of Sciences, CINAHL, PubMed, and Google Scholar using the search terms social accountability, medical school, faculty of medicine, Eastern Mediterranean Region, EMRO region. Using qualitative theme analysis, the extracted, coded, and analyzed data were reported. Results: The screening of various databases revealed 164 articles, 26 articles were finally included in the review. The 26 included articles originated from only seven out of the 22 EMR countries: Iran, Sudan, Kingdom of Saudi Arabia (KSA), United Arab Emirates, Egypt, Morocco, and Pakistan. The articles included were categorized under six themes: defining the SA and compliance with SA values and concepts, accreditation, educational program, perceptions of faculty and students, admission of students, and measurement of social accountability. Conclusions: The publications related to SA from the EM regions countries revealed similarities with other parts of the world in that the SA concept is not effectively translated into real day-to-day activities in medical schools. More work is needed from leaders in education and health systems to examine SA enablers and improve the uptake of the concept.</p