Performance of nano-structured multilayer PVD coating TiAlN/VN in dry high speed milling of aerospace aluminium 7010-T7651

A low-friction and wear resistant TiAlN/VN multilayer coating with TiAlN/VN bilayer thickness 3 nm has been grown by using the combined cathodic arc etching and unbalanced magnetron sputtering deposition on high speed steel tools for dry cutting of aluminium alloys. In this paper, in-lab and industrial high speed milling tests have been performed on an aerospace aluminium alloy 7010-T7651. The results show that the TiAlN/VN coated tools achieved lower cutting forces, lower metal surface roughness, and significantly longer tool lifetime by three times over the uncoated tools as a result of the low friction and eliminated tool-metal adhesion. Under the same conditions, a TiAlN based multicomponent coating TiAlCrYN also increased the tool lifetime by up to 100% despite the high cutting forces measured

A multimedia-based clinical decision support system for graduate nurses entering the workforce

This paper focuses on the design and development of a prototype of a clinical decision support system which incorporates critical aspects of workplace related education on a multimedia CD-ROM for use by graduate nurses in preparation for their entry into the workforce. This learning environment is innovative because of its use of 'casebased reasoning' as a design architecture. The significance of this innovation to nursing is that it complements the existing support programs such as Preceptor and Graduate Nurse Programs put in place for enhancing the transition of new graduates into the workforce. This paper outlines the development of this self-paced multimedia learning environment that has been designed to facilitate the transition of graduating nurses into the workplace. The environment uses an authentic case to simulate the complexities of life in a typical hospital ward, and placegraduating nurses in the role of decision-makers and problem-solvers. Problem solving in the simulation is based on a rich repertoire of cases and stories that have been extracted from the experiences of expert practitioners. This case-based reasoning architecture reflects a model of learning where graduating nurses are coached in the development of decision-making skills within the context of a contrived but an authentic scenario with a presenting problem. To this end, the goal of our developmental prototype is to enhance the coping skills of new graduates thereby enabling them to make the necessary transition to the workplace

Myopericytoma: a unifying term for a spectrum of tumours that show overlapping features with myofibroma. A review of 14 cases

BACKGROUND: Myopericytoma (MPC) is a recently proposed term to describe a group of tumours that originate from perivascular myoid cells and show a range of histological growth patterns. Only a small number of series describing MPC have been reported. MPC is frequently misdiagnosed as a sarcoma. AIMS: To document the clinical and histopathological findings of a series of MPCs, to describe the range of growth patterns and morphological spectrum, and to compare MPC with myofibroma (MF). PATIENTS/METHODS: Fourteen patients with features of MPC and/or MF were identified from the archival files of the department of anatomical pathology, Royal Prince Alfred Hospital, Sydney, Australia. RESULTS: There were six female and eight male patients. The mean and median patient ages were 37 and 35.5 years, respectively. The tumours were located in the skin, subcutis, or superficial soft tissues of the distal extremities (13 patients) or the head and neck region (one patient), and showed a spectrum of morphological appearances. They were divided into two groups based upon the predominant growth pattern corresponding to MPC (seven cases) and MF (seven cases). The feature most suggestive of MPC was the presence of a concentric perivascular arrangement of plump spindle shaped cells. The presence of a zonation/biphasic appearance was most characteristic of MF. CONCLUSIONS: MPC exhibits a spectrum of growth patterns that overlap with MF. Tumours can be designated as MPC or MF depending on the predominant growth pattern