30 research outputs found
Complete Break Up of Ortho Positronium (Ps)- Hydrogenic ion System
The dynamics of the complete breakup process in an Ortho Ps - He+ system
including electron loss to the continuum (ELC) is studied where both the
projectile and the target get ionized. The process is essentially a four body
problem and the present model takes account of the two centre effect on the
electron ejected from the Ps atom which is crucial for a proper description of
the ELC phenomena. The calculations are performed in the framework of Coulomb
Distorted Eikonal Approximation. The exchange effect between the target and the
projectile electron is taken into account in a consistent manner. The proper
asymptotic 3-body boundary condition for this ionization process is also
satisfied in the present model. A distinct broad ELC peak is noted in the fully
differential cross sections (5DCS) for the Ps electron corroborating
qualitatively the experiment for the Ps - He system. Both the dynamics of the
ELC from the Ps and the ejected electron from the target He+ in the FDCS are
studied using coplanar geometry. Interesting features are noted in the FDCS for
both the electrons belonging to the target and the projectile.Comment: 14 pages,7 figure
Research in Medical Education: Balancing Service and Science*
Since the latter part of the 1990âs, the English-speaking medical education community has been engaged in a debate concerning the types of research that should have priority. To shed light on this debate and to better understand its implications for the practice of research, 23 semi-structured interviews were conducted with âinfluential figuresâ from the community. The results were analyzed using the concept of âfieldâ developed by the sociologist Pierre Bourdieu. The results reveal that a large majority of these influential figures believe that research in medical education continues to be of insufficient quality despite the progress that has taken place over the past 2 decades. According to this group, studies tend to be both redundant and opportunistic, and researchers tend to have limited understanding of both theory and methodological practice from the social sciences. Three factors were identified by the participants to explain the current problems in research: the working conditions of researchers, budgetary restraints in financing research in medical education, and the conception of research in the medical environment. Two principal means for improving research are presented: intensifying collaboration between PhDâs and clinicians, and encouraging the diversification of perspectives brought to bear on research in medical education
The interpersonal communication approach to HIV/AIDS prevention: strategies and challenges for faith-based organizations.
This study examines the interpersonal communication approach to HIV/AIDS prevention within Faith-Based Organizations (FBOs) in Jamaica. Applying concepts from the social influence and social learning theories, the study examines communication strategies, challenges and concerns that religious leaders face in their communication efforts. Data gathered qualitatively through focus groups and in-depth interviews indicate that FBOs are social and cultural entities with potential to influence knowledge,attitude and behaviour for HIV/AIDS prevention. However, issues related to content, context, culture,
the prevailing AIDS-related stigma alongside religious leadersâ personal characteristics hamper their communication initiatives. Capacity building of leaders as HIV/AIDS communicators and behaviour change facilitators and a collaborative effort between FBOs and health organizations would enhance their HIV/AIDS response
âI am not someone who gets skin cancerâ: Risk, time and malignant melanoma
âDelayâ is a term used in the cancer literature since the 1930s to describe the period between self-detection of a concerning sign of possible disease and presentation to a health professional. This linguistic choice carries an implication of blame for apparent failure to manage a risk appropriately, drawing attention away from the contemporaneous perspectives of those who respond to suspicious indicators more or less quickly. We present findings from a grounded theory study of accounts given by 45 patients about their slower or quicker journeys to a diagnosis of cutaneous malignant melanoma, a cancer which can âhide in plain sightâ. There has been little research exploring in qualitative detail patientsâ perspectives on their decision-making about what subsequently turn out to have been signs of this most risky of skin cancers. The findings frame referral time-lapses in terms of normalisation of symptoms, sometimes buttressed by reassurance derived from health promotion messages, disconfirmation of patientsâ concerns by their general practitioners and prioritisation of other life concerns. We argue that a shared sense of urgency surrounding melanoma self-referral derives from a clinical representation of current knowledge which conceals numerous evidential uncertainties
A Call for Qualitative Power Analyses
Abstract. The purpose of this paper is to emphasize the importance of sampling and sam-ple size considerations in all qualitative research. Such considerations would help qualita-tive researchers to select sample sizes and sampling designs that are most compatible with their research purposes. First, we discuss the importance of sampling in qualitative research. Next, we outline 24 designs for selecting a sample in qualitative research. We then discuss the importance of selecting a sample size that yields data that have a realistic chance of reaching data saturation, theoretical saturation, or informational redundancy. Based on the literature, we then provide sample size guidelines for several qualitative research designs. As such, we provide a framework for making sampling and sample size considerations in inter-pretive research