Study Of The Effect Of Sintering Parameters On Characteristics Of W-Bronze Composites Prepared Via Different Densification Techniques

W-bronze composites are very promising MMC material. It has high potential in military and industrial applications and it can replace lead in different fields where the density is of main consideration. In this study, since tungsten metal and bronze alloy are almost completely immiscible in both solid and liquid phases, different approaches and techniques were utilized to attain highly dense and homogenously structured composites. Super-solidus liquid phase sintering with 2 to 3 wt.% Fe additions improved the hardness by two folds and the sintered density by 5 % to 10%. Mechanical alloying of the W, Cu and Sn powder precursors by two-step process yielded composite particles of W impregnated in Cu-Sn matrix. The outcome after sintering was a composite of 85 to 95% of their theoretical density with excellent corrosion and wear resistance properties. By the implementation of a proposed new shell-on-core densification technique, composites of different compositions with 95-99% of their theoretical density were attained. The different W-bronze composite materials produced, were subjected to different laboratory testing and examinations to assess their microstructural, fractural, mechanical, chemical and physical properties

A curriculum to teach medical students to care for people with disabilities: development and initial implementation

<p>Abstract</p> <p>Background</p> <p>Lack of knowledge and skills, and negative attitudes towards patients with disabilities, may adversely affect the services available to this group and negatively affect their health outcomes. The objective of this paper is to describe the development and initial implementation of a curriculum for teaching medical students to care for patients with disabilities.</p> <p>Methods</p> <p>We followed the six-step approach for developing curricula for medical education: general needs assessment, specific needs assessment, defining goals and objectives, determining the educational strategies, planning the implementation, and developing an evaluation plan.</p> <p>Results</p> <p>The curriculum has well defined goals and objectives covering knowledge, attitudes and skills. It employs both traditional and non-traditional teaching strategies. The implementation is planned over the four-year medical school curriculum in collaboration with a number of academic departments and specialized community-based agencies. The curriculum evaluation includes an attitudinal survey which is administered using a controlled design (pre- and post- exposure to the curriculum). The initial implementation of the curriculum has been very successful.</p> <p>Conclusion</p> <p>We have developed a longitudinal curriculum to teach medical students to care for people with disabilities. A rigorous evaluation of the impact of the curriculum is needed.</p

Elderly patients admitted to secure forensic psychiatry services

In a study of admissions to medium- and high-security from 7 of 14 health regions over a 7-year period, less than 2% were aged 60 years or over. These patients were atypical and highly selected, and half had committed homicide. Depressive illness, delusional disorder and dementia were the most prevalent diagnoses. The patients aged 60 and over had fewer previous convictions than younger patients, and were older when first admitted to psychiatric hospitals, usually in the context of their offending behaviour. The study suggests that some admissions to specialist services reflect an absence of more suitable provision for elderly patients at a lower level of security. Forensic psychiatry services were not involved with the growing number of elderly prisoners who are serving longer prison sentences and the needs of this group require further study

Motion Analysis-Based Application for Enhancing Physical Education

Physical education plays an important role in positively influencing students to develop a good learning process and a healthy lifestyle. Moreover, physical education assists students and athletes in developing muscular strength, maintaining fitness, and improving cardiovascular health. Issues arise when the lack of actual pattern of movement of children in sports leads to difficulties in implementing the correct movement, thereby decreasing the interest of students in physical education and students may suffer from muscular injury if they make the wrong movement. In this study, a human motion analysis method is utilized to overcome the abovementioned issues. Human motion analysis supports physical education in analyzing human movement behavior or patterns in conducting physical activities. Thus, this paper aims to develop an application for teaching students to perform the correct movement during physical education courses using motion analysis, which can help reduce the threats to physical education and solve its main issue, which is injury in athletes. The proposed application is expected to increase the interest and participation levels of students in physical education courses

Overview on Case Study Penetration Testing Models Evaluation

Model evaluation is a cornerstone of scientific research as it represents the findings' accuracy and model performance. A case study is commonly used in evaluating software engineering models. Due to criticism in terms of generalization from a single case study and testers, deciding on the number of case studies used for evaluation and the number of testers has been one of the researchers’ challenges. Multiple case studies with multiple testers can be difficult in some domains, such as penetration testing, due to the complexity and time needed to prepare test cases. This study aims to review the literature and examine the evaluation methods used pertaining to the number of case studies and testers involved. This study is beneficial for researchers, students, and penetration testers as it provides case study design steps that are useful to determine the appropriate number of test cases and testers required. The paper's findings and novelty highlight that a single case study with a single tester is enough to evaluate a model. It also strikes a balance between what is enough for the evaluation and the need to reduce criticisms of a single case study by using two case studies with a single tester.   Doi: 10.28991/ESJ-2023-07-03-025 Full Text: PD

Advantages of the Green Solid State FSW over the Conventional GMAW Process

The present work is an experimental comparison between the friction stir welding (FSW) and the conventional gas metal arc welding (GMAW) in joining of Al alloys. Two sets of 3 mm thick aluminum strip pairs were friction stir welded in a regular butting joint configuration. Two rotational speeds of 1750 rpm and 2720 rpm were utilized to perform the FSW process. The axial force and the transverse speed were kept constant at 6.5 KN and 45 mm/min, respectively. Cylindrical tool shoulder and pin geometry were selected. Strip pairs of other similar sets were butt jointed using the conventional GMAW. The welding quality, power input, and macrostructure and microstructure of the butted joints were examined. The types of the fumes and the amount of the released gases were measured and compared. The results showed that the solid state FSW is green, environment-friendly, and of superior welding properties compared to the conventional GMAW