Development of positioning jig for glass capillary bending mechanism

In a bending mechanism for glass capillary, the positioning jig to hold the capillary in place is one of the most important components to ensure the bending quality. The tapered shoulder of the capillary is used as the positioning reference. Since the dimension of the shoulder of individual capillaries varies slightly, the geometry of the capillaries is studied to identify the desired positioning spot on the shoulder. Upon determination of the positioning spot, a positioning jig is designed, which is composed of positioning, holding, and clamping units. A prototype is made and assembled onto the bending mechanism for testing. The testing results show that the mechanism is able to achieve the desired functionalities demanded by the delicate bending process.

Positioning, linguistic theory and Orwell's short nonfiction

It is argued, making reference to an Orwell text sample, that linguistic theory illuminates "positioning" (as term and concept), that positioning's flexibility contributes to critical textual analysis and to attempts to understand complex human processes, but how far language may constrain as well as facilitate such understanding must remain open.

Reflective positioning : the impact of conversations in the social and cultural environment of midwifery practice settings on professional learning for students

Literature reviews on the topic of reflection and reflective practice encompassed midwifery, nursing, medicine, allied health, education and professional education. This investigation also included socio-psychological theories by leading authors such as Benner (nursing), Schön (professional education) and positioning theory by Harré and others. Positioning is a psycho-sociological ontology in which individuals metaphorically position themselves within three entities: people, institutions, and societies, where conversations are constructed and make an impact upon the social world. The social and cultural structures and interactions developed in Archer’s morphogenesis were examined in terms of the impact of possible encounters and the transformational effects of learning experiences in practice settings. These bodies of work provided the theoretical framework for the author’s research of students’ experiences in midwifery education for postgraduate students from which selected excerpts with three participating students and their supervising midwives are presented. These excerpts are related to reflective practices and the professional conversations conducted between students and midwives. It was found that reflective positioning applied in midwifery education by students can serve as an analytical tool in explaining social and cultural elements of clinical placements to influence and transform their learning. The potency of conversations that occur in everyday moment-to-moment interactions do contribute to students’ induction in professional midwifery practice and their identity formation as a midwife.

Positioning people with intellectual disabilities as the experts : enhancing pre-service teachers’ competencies in teaching for diversity

The need for graduate teachers to own their professional responsibilities to engage successfully with students with special educational needs (SENs) in mainstream classrooms has been recognised in educational policies and programmes in many countries for well over two decades. Despite wide-ranging research, questions remain as to how pre-service education courses can help beginning teachers to develop the required commitment, knowledge and pedagogies to feel confident in teaching students with disabilities. Challenges to find new ways to enhance pre-service teachers’ familiarity with special needs children, overcome resistance from some towards including SEN students in mainstream classrooms and develop a sense of efficacy in teaching are common to many programmes. In this paper, we report on a pilot study where adults with intellectual disabilities, as members of a community theatre, were positioned as the experts and explored their schooling experiences and personal biographies with soon-to-be graduate teachers in a 3 h workshop. Taking the lead and working collaboratively with the workshop participants, members of Fusion Theatre used drama activities to develop understandings of strategies that helped them to learn. By challenging the traditional power relationships between those labelled as ‘disabled’ and those who would be teachers, the workshop helped the participants to engage on many levels. Here, we report on the data, analyse the findings and discuss implications for other pre-service programmes.

Greater auricular nerve neuropraxia with beach chair positioning during shoulder surgery

Neuropraxia of the greater auricular nerve is an uncommon complication of shoulder surgery, with the patient in the beach chair position. The greater auricular nerve, a superficial branch of the cervical plexus, is vulnerable to neuropraxia due to its superficial anatomical location. In this case series, we present three cases of neuropraxia associated with direct compression by a horseshoe headrest, used in routine positioning for uncomplicated shoulder surgery. We outline the risk of using devices of this nature and discourage the use of similar headrest devices due to the potential complications in headrest devices that exert pressure on the posterior auricular area to maintain head position during surgery.

Global positioning systems in the AFL : worthwhile or waste of time?

Global Positioning Systems (GPS) in the Australian Football League (AFL) are the big-ticket item that sees clubs trying to gain any competitive advantage over their opposition that they can. This paper explores whether the current application of GPS by clubs is worthwhile or a waste of time from three core perspectives: technical, organisational and personal. Issues include poor data storage and analysis, inaccurate units, lack of appropriate business processes in place, and resistance to use. Although many of these issues can be addressed through improved technology, resolving the organisational and personal issues will require a change in mindset to ensure the use of GPS in the AFL is a worthwhile endeavour. The paper concludes that the current use of GPS devices in the AFL is a waste of time.

Effects of tool positioning on joint interface microstructure and fracture strength of friction stir lap Al-to-steel welds

Friction stir lap welding (FSLW) experiments have been conducted to study the effects of tool positioning on microstructures formed in the Al-to-steel interface region and on joint strength, defined as maximum applied force over the width (F m/w s) of the test sample, of the welds. Various pin positioning and speed conditions were used in the FSLW experiments followed by microstructure examination on the interface regions and tensile-shear testing on the welds, including an examination on crack propagation in mixed stir zone. It was found that when the pin was close to the bottom steel piece, Al-to-steel reaction occurred resulting in intermetallic outbursts formed along the interface. This represents the case of incomplete metallurgical joint. When the pin was lowered to just reach the steel, a thin and continued interface intermetallic layer formed. Evidences and consideration on growth kinetics have suggested that the layer could only remain thin (≤2.5 μm) during FSLW. This layer could bear a high load during tensile-shear testing and the adjacent aluminium deformed and fractured instead. The resulting F m/w s was high. When the pin penetrated to steel, F m/w s reduced due to brittle fracture being dominant inside mixed stir zone. Evidences have shown that the amount of penetration and speed condition during FSLW do not have large effects on F m/w s.