NASA Numerical and Experimental Evaluation of UTRC Low Emissions Injector

Computational and experimental analyses of a PICS-Pilot-In-Can-Swirler technology injector, developed by United Technologies Research Center (UTRC) are presented. NASA has defined technology targets for near term (called "N+1", circa 2015), midterm ("N+2", circa 2020) and far term ("N+3", circa 2030) that specify realistic emissions and fuel efficiency goals for commercial aircraft. This injector has potential for application in an engine to meet the Pratt & Whitney N+3 supersonic cycle goals, or the subsonic N+2 engine cycle goals. Experimental methods were employed to investigate supersonic cruise points as well as select points of the subsonic cycle engine; cruise, approach, and idle with a slightly elevated inlet pressure. Experiments at NASA employed gas analysis and a suite of laser-based measurement techniques to characterize the combustor flow downstream from the PICS dump plane. Optical diagnostics employed for this work included Planar Laser-Induced Fluorescence of fuel for injector spray pattern and Spontaneous Raman Spectroscopy for relative species concentration of fuel and CO2. The work reported here used unheated (liquid) Jet-A fuel for all fuel circuits and cycle conditions. The initial tests performed by UTRC used vaporized Jet-A to simulate the expected supersonic cruise condition, which anticipated using fuel as a heat sink. Using the National Combustion Code a PICS-based combustor was modeled with liquid fuel at the supersonic cruise condition. All CFD models used a cubic non-linear k-epsilon turbulence wall functions model, and a semi-detailed Jet-A kinetic mechanism based on a surrogate fuel mixture. Two initial spray droplet size distribution and spray cone conditions were used: 1) an initial condition (Lefebvre) with an assumed Rosin-Rammler distribution, and 7 degree Solid Spray Cone; and 2) the Boundary Layer Stripping (BLS) primary atomization model giving the spray size distribution and directional properties. Contour and line plots are shown in comparison with experimental data (where this data is available) for flow velocities, fuel, and temperature distribution. The CFD results are consistent with experimental observations for fuel distribution and vaporization. Analysis of gas sample results, using a previously-developed NASA NOx correlation, indicates that for sea-level takeoff, the PICS configuration is predicted to deliver an EINOx value of about 3 for the targeted supersonic aircraft. Emissions results at supersonic cruise conditions show potential for meeting the NASA goals with liquid fuel

Informed consent for research involving people with dementia: A grey area

Research involving people with dementia has been flagged as a key priority by Alzheimer's International. Dementia has been an Australian National Health Priority since 2005, yet there are no clear guidelines for seeking and obtaining informed consent from people with dementia to participate in observational research. Informed consent is an ethical requirement for the conduct of research involving humans. Although many people with dementia are able to express a desire to be involved in research, the insidious progression of the disease reduces a persons ability to understand and appreciate the consequences of involvement. This paper explores the author's journey of seeking and obtaining informed consent for a mixed methods study which involved the observation of older people with dementia. Copyright © eContent Management Pty Ltd

Caring for older people with dementia in residential care: nursing students' experiences

Aim. This paper is a report of selected findings from two projects aimed at improving nursing students' experiences of caring for older people in elder care settings. Background. With a growing number of older people the prevalence of dementia is rapidly increasing, such that it is now a primary reason for admission to residential care. This has implications for the preparation and support of nursing students on clinical placements as people with dementia represent a key focus of their nursing activities. Method. Two projects were conducted in Tasmania between 2001 and 2005, involving 87 second year Bachelor of Nursing students who participated in 3-week clinical placements in eight residential elder care facilities. During the placements, students and their mentors participated in a series of weekly focus group discussions to explore their experiences of caring for residents with dementia. Thematic analysis of the data was conducted. Findings. Staff in the facilities struggled to support students effectively and often failed to recognize that students found residents' behaviour disturbing. Despite having some theoretical understanding of dementia, students reported being unsure of how to respond to residents and often felt scared and intimidated. Conclusion. Better preparation and support are needed for students on placements involving residents with dementia. Feasible strategies for more effective support include increased curriculum content about caring for people with dementia, and improved collaboration between university schools of nursing and settings for care of older people. © 2007 The Authors. Journal compilation 2007 Blackwell Publishing Ltd

Nurses under threat: a comparison of content of 28 aggression management programs

Staff who work in the health service are now recognized as a high-risk group for assault in the workplace. Recently, professional and industrial organizations have begun to suggest appropriate curricula for training staff in aggression management. However, there is currently a plethora of aggression management training programs (AMP) available, varying both in content and in duration. In this paper, 28 programs were evaluated against 13 major content areas derived from the recommendations made from key professional and industrial organizations, and what may be today considered appropriate/ideal content areas for AMP. Information on programs available in English was sought via standard databases, the Internet, program providers, and through networking with colleagues and professional organizations. The majority of the programs reviewed covered personal safety issues for staff and patients, together with legal issues. The use of restraint, pharmacological management of aggression and seclusion were features of programs specifically addressing the needs of health care staff in mental health settings. Most programs appeared not to address the psychological and organizational costs associated with aggression in the workplace. This is surprising since the literature suggests that the effects of violence are wide and varied, including increased absenteeism and sick leave, property damage, decreased productivity, security costs, litigation, workers' compensation, reduced job satisfaction together with recruitment and retention issues. Also, few programs were based on a systematic evaluation of their outcomes. Suggestions for program development and their teaching are discussed

Physically aggressive behaviours exhibited by people with dementia: Observational data versus staff reports

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Student nurses' experiences of the body in aged care

Little is known about how student nurses deal with 'old bodies' in the process of providing nursing care to nursing home residents. It was an issue raised by student nurse participants involved in a pilot research project designed to develop support structures for students on placement in aged care settings. During the research discussions, where students explored their experiences of working in aged care, it became apparent that the process of providing 'hands on' care to residents with 'old wrinkly bodies' was very confronting. However, in the context of the research project, students had an opportunity to share stories of their experiences of providing care to residents and critically reflect on the issues raised. Participation in these critically reflective discussions facilitated a process whereby students could challenge taken for granted understandings of older people and their bodies and develop a new appreciation of aged care. This was most evident in a significant positive shift in their attitude to working in the sector following graduation

Ranking behaviours of concern in dementia

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Building connections in aged care - facilitating student nurse placements in residential care facilities

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Using the WWW to teach undergraduate nurses clinical communication

On-line learning is increasingly being used in nursing education. Nevertheless, there is still insufficient evidence to demonstrate: whether students respond positively when this form of learning is used to teach relatively practical or clinical subjects; whether it is effective; and whether it is fair to students with less access to, or familiarity with, computers and the internet. In 2003, an on-line Unit on clinical communication was developed for Australian undergraduate nurses in partnership between an Australian School of Nursing and the a Department of Clinical Psychology. Students were overwhelmingly positive in their evaluation of the Unit although some regretted the lack of face-to-face contact with tutors and peers. The best aspects of the Unit included the content and structure being perceived as interesting, fun and informative, the relevance of the material for them as nurses, flexibility to work independently, promotion of critical thinking and gaining an understanding of client issues. Neither their evaluation nor their final grades were related to students' age or whether they preferred on-line or traditional learning. Students who had readily available computer access, however, had better final grades. Also, students' grades were correlated with how often they accessed the Unit. © 2006 Elsevier Ltd. All rights reserved