N-dimensional electron in a spherical potential: the large-N limit

We show that the energy levels predicted by a 1/N-expansion method for an N-dimensional Hydrogen atom in a spherical potential are always lower than the exact energy levels but monotonically converge towards their exact eigenstates for higher ordered corrections. The technique allows a systematic approach for quantum many body problems in a confined potential and explains the remarkable agreement of such approximate theories when compared to the exact numerical spectrum.Comment: 8 pages, 1 figur

Attitudes Surrounding a Community-Based Fitness Intervention at an Urban FQHC

BACKGROUND AND OBJECTIVES: The population surrounding an urban federally qualified health center (FQHC) in Philadelphia has poorer health than Philadelphia overall. Community residents identified aerobics and dance classes as very important services or programs that an FQHC might provide. We sought to measure the impact of participation in a resident physician-led, patient-centered fitness and nutrition class on participants’ attitudes, knowledge, and self-efficacy regarding their health. METHODS: An urban line dancing class and brief healthy eating intervention for adults was held at a YMCA adjacent to a residency-affiliated FQHC weekly for 8 weeks. Pre/postsurveys were administered to assess attitudes and confidence toward physical activity and healthy lifestyles. RESULTS: Participants’ self-assessment of health and levels of physical activity improved. Confidence in performing everyday activities, doing regular exercise and exercising without making symptoms worse increased. A significant decrease in participants’ physical activity gratification was observed. Participants’ confidence improved in reading food labels for health, but confidence in eating a balanced diet did not improve. CONCLUSIONS: A resident-led fitness and nutrition class, tailored to perceived community needs, generated significant interest and sustained participation. This pilot study furthered development of community infrastructure addressing health, nutrition, and overall fitness, and the results reflect opportunities and challenges of engaging communities in physical fitness

Magnetism and its microscopic origin in iron-based high-temperature superconductors

High-temperature superconductivity in the iron-based materials emerges from, or sometimes coexists with, their metallic or insulating parent compound states. This is surprising since these undoped states display dramatically different antiferromagnetic (AF) spin arrangements and N$\rm \acute{e}$el temperatures. Although there is general consensus that magnetic interactions are important for superconductivity, much is still unknown concerning the microscopic origin of the magnetic states. In this review, progress in this area is summarized, focusing on recent experimental and theoretical results and discussing their microscopic implications. It is concluded that the parent compounds are in a state that is more complex than implied by a simple Fermi surface nesting scenario, and a dual description including both itinerant and localized degrees of freedom is needed to properly describe these fascinating materials.Comment: 14 pages, 4 figures, Review article, accepted for publication in Nature Physic

Do physician outcome judgments and judgment biases contribute to inappropriate use of treatments? Study protocol

<p>Abstract</p> <p>Background</p> <p>There are many examples of physicians using treatments inappropriately, despite clear evidence about the circumstances under which the benefits of such treatments outweigh their harms. When such over- or under- use of treatments occurs for common diseases, the burden to the healthcare system and risks to patients can be substantial. We propose that a major contributor to inappropriate treatment may be how clinicians judge the likelihood of important treatment outcomes, and how these judgments influence their treatment decisions. The current study will examine the role of judged outcome probabilities and other cognitive factors in the context of two clinical treatment decisions: 1) prescription of antibiotics for sore throat, where we hypothesize overestimation of benefit and underestimation of harm leads to over-prescription of antibiotics; and 2) initiation of anticoagulation for patients with atrial fibrillation (AF), where we hypothesize that underestimation of benefit and overestimation of harm leads to under-prescription of warfarin.</p> <p>Methods</p> <p>For each of the two conditions, we will administer surveys of two types (Type 1 and Type 2) to different samples of Canadian physicians. The primary goal of the Type 1 survey is to assess physicians' perceived outcome probabilities (both good and bad outcomes) for the target treatment. Type 1 surveys will assess judged outcome probabilities in the context of a representative patient, and include questions about how physicians currently treat such cases, the recollection of rare or vivid outcomes, as well as practice and demographic details. The primary goal of the Type 2 surveys is to measure the specific factors that drive individual clinical judgments and treatment decisions, using a 'clinical judgment analysis' or 'lens modeling' approach. This survey will manipulate eight clinical variables across a series of sixteen realistic case vignettes. Based on the survey responses, we will be able to identify which variables have the greatest effect on physician judgments, and whether judgments are affected by inappropriate cues or incorrect weighting of appropriate cues. We will send antibiotics surveys to family physicians (300 per survey), and warfarin surveys to both family physicians and internal medicine specialists (300 per group per survey), for a total of 1,800 physicians. Each Type 1 survey will be two to four pages in length and take about fifteen minutes to complete, while each Type 2 survey will be eight to ten pages in length and take about thirty minutes to complete.</p> <p>Discussion</p> <p>This work will provide insight into the extent to which clinicians' judgments about the likelihood of important treatment outcomes explain inappropriate treatment decisions. This work will also provide information necessary for the development of an individualized feedback tool designed to improve treatment decisions. The techniques developed here have the potential to be applicable to a wide range of clinical areas where inappropriate utilization stems from biased judgments.</p

In the eye of the beholder: Communicating CSR through color in packaging design

Consumers have become much more attentive and demanding about corporate social responsibility (CSR), and companies are now gradually becoming aware that receiving consumer favor could depend on conducting business in a sustainable manner. Moreover, in order to gain returns from their CSR investments, such as company reputation, customer loyalty and customer–company identification, firms must also provide effective communication of their CSR efforts to the consumers. This study explores the potential of packaging color for conveying CSR to consumers, focusing in particular on consumer packaged goods. For this purpose, a quantitative study was conducted on a representative sample of consumers (n = 2000) in the form of a structured questionnaire, administered using face-to-face interviews. Three different stimuli were created through fictitious images of a nonexistent brand product. Only the color of the packaging varied, while all the other graphic elements were left unchanged. The results show that, despite the prevailing association of green with the concepts of sustainability and CSR, it is not the most suitable color to clearly and credibly convey a CSR message to consumers. Thus, it is important to examine whether different colors could serve better to improve the clarity and credibility of CSR claims