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Search Results: 1 - 10 of 326440 matches for " S. Reid "
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rural medicine as a sub-specialty: Could rural medicine be regarded as a specialty, or sub-specialty, in its own right? This article is intended to generate discussion and debate, and makes no apologies for being provocative
S Reid
Continuing Medical Education , 2011,
The African Family Physician
S Reid
South African Family Practice , 2007,
Abstract: A group of 8 South African academics in Family Medicine met recently at a workshop in Kampala, Uganda, with some 20 colleagues from a number of sub-Saharan African countries in order to promote the development of Family Medicine throughout the continent. While this seems a lofty goal, the practitioner on the ground may ask: “What for?” Well, this is one response South African Family Practice Vol. 49 (9) 2007: pp. 3
The retention of community service officers for an additional year at district hospitals in KwaZulu-Natal and the Eastern Cape and Limpopo provinces
A Rose, S Reid
South African Family Practice , 2009,
Abstract: Background: Community service (CS) is an effective recruitment strategy for underserved areas, using legislation as the driver; however, it is not a retention strategy. By the end of each year, most CS officers working in district hospitals (DHs) are skilled, valued and valuable members of the health team, able to cope with the demands of working in the public health service within the resources available at DHs. Their exodus at the end of each annual cycle represents a net loss of valuable skills and experience by the public service, measured by the time and effort required to orientate and induct the following cohort of CS officers. This in turn has a negative effect on the level of service delivery and the quality of patient care. This study sought to gain understanding of the motivations of CS officers to continue working at the same DH for a subsequent year after their obligatory year was over. The objectives were to determine the number of CS officers who actually remained at the same DH after completing their CS in 2002, the major factors that influenced them to remain and factors that would encourage the 2003 cohort of CS officers to remain at the same DH for an additional year. Methods: A descriptive cross-sectional study design was employed using qualitative methods with the cohort of CS officers who had completed their compulsory CS year in 2002 and who were still working at the same DH in July 2003. This was followed by a quantitative survey of CS officers doing their CS at DHs in KwaZulu-Natal (KZN), the Eastern Cape (EC) and Limpopo Province (LP) in November 2003. Results: Twenty-two out of 278 (8%) of the 2002 cohort of CS officers in KZN, EC and LP remained at the same DH in the year following their CS. The reasons given, in order of decreasing priority, were that they were close to home, had been allocated as part of their CS, had been personally recruited, had bursary commitments, had heard about the hospital from friends, had visited the hospital prior to starting CS and had visited as a medical student. Four CS officers did not specify reasons. In the larger quantitative study 150 out of 221 questionnaires were returned. More than 80% of the respondents felt that there had been opportunities to develop confidence in their own ability to make independent decisions, that they had had good relations with the hospital staff and that they had been able to make a difference in health care delivery. Between 67% and 76% of respondents felt that they were providing a good standard of care, that there were learning opportunities, that they were doing worthwhile work and that CS provided excellent work experience. However, only 52% of respondents felt that there had been opportunities for personal growth, 38% felt that appropriate equipment was available, 37% had a supportive mentor figure and 29% felt that there were adequate levels of staffing at the hospital. In total 24 (16%) of the 150 officers who responded to the questionnaire ind
James Clerk Maxwell's class of 1856/57
John S. Reid
Physics , 2015,
Abstract: James Clerk Maxwell is known for his outstanding contributions to fundamental physics. These include providing the equations that govern electric and magnetic fields, establishing the basis of modern colourimetry, finding important relationships in thermodynamics, molecular science, mechanics, optics and astronomy. In his first Professorial chair in 1856 at the Marischal College and University of Aberdeen he undertook a substantial amount of teaching that laid the foundation for his later pedagogic output. This paper examines whom he taught, where his first students came from and what they did in later life, drawing material from a privately published memoir. Thumbnail portraits are included for 70% of his class. The analysis complements the usual emphasis on educational method and content. The data provide an interesting sociological survey of what Scottish University education was achieving in the middle of the 19th century and is presented as raw material for a wider enquiry.
A decadal regional and global trend analysis of the aerosol optical depth using a data-assimilation grade over-water MODIS and Level 2 MISR aerosol products
J. Zhang,J. S. Reid
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010,
Abstract: Using the ten-year (2000–2009) Data-Assimilation (DA) quality Terra MODIS and MISR aerosol products, as well as 7 years of Aqua MODIS, we studied both regional and global aerosol trends over oceans. This included both operational and data assimilation grade versions of the products. After correcting for what appears to be aerosol signal drift from the radiometric calibration of both MODIS instruments, we found MODIS and MISR agreed on a statistically negligible global trend of ±0.003/per decade. Our study also suggests that AODs over the Indian Bay of Bengal, east coast of Asia, and Arabian Sea show increasing trends of 0.07, 0.06, and 0.06 per decade for MODIS, respectively. These regional trends are considered as significant with a confidence level above 95%. Similar increasing trends were found from MISR, but with less relative magnitude. These trends reflect respective increases in the optical intensity of aerosol events in each region: anthropogenic aerosols over the east coast of China and Indian Bay of Bengal; and a stronger influence from dust events over the Arabian Sea. Negative AOD trends, low in confidence levels, are found off Central America, the east coast of North America, and the west coast of Africa, which indicate that longer periods of observation are necessary to be conclusive.
Low-mass spectroscopic binaries in the Hyades: a candidate brown dwarf companion
I. N. Reid,S. Mahoney
Physics , 2000, DOI: 10.1046/j.1365-8711.2000.03598.x
Abstract: We have used the HIRES echelle spectrograph in the Keck I telescope to obtain high-resolution spectroscopy of 51 late-type M dwarfs in the Hyades cluster. Cross-correlating the calibrated data against spectra of white dwarfs allows us to determine heliocentric velocities with an accuracy of +/- 0.3 km/s. Twenty seven stars were observed at two epochs in 1997; two stars, RHy 42 and RHy 403, are confirmed spectroscopic binaries. RHY 42 is a double-lined, equal-mass system; RHy 403 is a single-lined, short-period binary, P ~ 1.275 days. RHy 403A has an absolute magnitude of M_I = 10.85, consistent with a mass of 0.15 M(Sun). The systemic mass function has a value of 0.0085, which, combined with the non-detection of a secondary peak in the cross-correlation function, implies 0.095 > M_2 > 0.06 M (Sun), and the strong possibility that the companion is the first Hyades brown dwarf to be identified. Unfortunately, the maximum expected angular separation in the system is only 0.25 mas. Five other low-mass Hyads are identified as possible spectroscopic binaries, based either on repeat observations or comparison between the observed radial velocity and the value expected for Hyades cluster members. Combined with HST imaging data, we infer a binary fraction between 23 and 30 . All of the stars are chromospherically active. RHy 281 was caught in mid-flare and, based on that detection, we estimate a flaring frequency of 2.5% for low-mass Hyades stars. Nine stars have rotational velocities, v sin(i), exceeding 20 km/s and most of the sample have detectable rotation. We examine the H-alpha emission characteristics of low-mass cluster members and show that there is no evidence for a correlation with rotation.
Papillary Muscle Function Does Not Predict Mitral Regurgitation in Patients with Normal Left Ventricular Systolic Function: A Transesophageal Echocardiographic Study  [PDF]
Ernest C. Madu, Dainia S. Baugh, Edwin Tulloch-Reid, Chiranjivi Potu
International Journal of Clinical Medicine (IJCM) , 2011, DOI: 10.4236/ijcm.2011.22030
Abstract: Objective: To evaluate LV papillary muscles (PM) function using transesophageal echocardiography (TEE), and to determine the relationship between PM function and mitral regurgitation in patients with normal left ventricular sys-tolic function. Design: TEE examinations were prospectively performed. End diastolic and end systolic PM lengths were obtained from the transgastric long axis views and fractional systolic shortening (FS) was calculated. LV ejection fraction was determined using modified Simpson rule and mitral regurgitation was determined using regurgitant jet area by color flow. Setting: Tertiary Center. Patients: 85 consecutive adult patients (51 with mitral regurgitation and 34 without) with normal LV chamber dimensions and LV systolic function, meeting enrollment criteria. Results: The % FS in patients with mitral regurgitation was 21.7 ± 3.6% for anterior PM (APM) and 18.7 ± 4.6% for posterior PM (PPM). In those without mitral regurgitation, the values were as follows; 22.6 ± 5.4% (APM) and 19.5 ± 3.8% (PPM). In a subgroup of patients with severe mitral regurgitation (n = 23), the values for PM FS were 20.3 ± 6.8 (APM) and 18.4 ± 6.9 % (PPM). There was no statistically significant difference in PM fractional shortening between the groups. Anterior papillary muscle length was longer in those patients with mitral regurgitation compared to those without [(End-diastolic length (cm): 3.38 ± 0.61 v 2.88 ± 0.47(p: 0.008) and end-systolic length of 2.46 ± 0.51 v 2.17 ± 0.33 (p: 0.04)]. These differences are more pronounced in those with severe mitral regurgitation (p: 0.002 and 0.004 for EDL and ESL respectively. Conclusion: In patients with normal LVEF, PM contraction is similar in those with and without MR. In patients with MR however, anterior PM length (ED & ES) is significantly increased. Our data suggests that in patients with normal LVEF, PM dysfunction appears to play no significant role in the causation of MR. Anterior papillary muscle length however, appears to be a major determinant of mitral regurgitation in such patients.
Masses and Gravities of Blue Horizontal Branch Stars Revisited
U. Heber,S. Moehler,I. N. Reid
Physics , 1997,
Abstract: Previous spectroscopic analyses of Blue Horizontal Branch (BHB) stars in six globular clusters revealed too low masses in four clusters when compared to canonical evolutionary theory, while the masses of the BHB stars in NGC 6752 and M 5 are found to be consistent with theory. We recalculated BHB star masses using new cluster distances derived by Reid (1997a,b) from HIPPARCOS parallaxes of local subdwarfs by main sequence fitting. The new distances are larger than previous estimates resulting in larger masses for the BHB stars. Since the increase in distance is small for NGC 6752 and M 5, the agreement with predicted masses persists. For M 15 and M 92 the masses now come into good agreement with theoretical predictions, while for NGC 288 and NGC 6397 the mass deficit is reduced but the BHB star masses remain slightly too low. Previous spectroscopic analyses also highlighted the problem of too low gravities for some BHB stars. The gravities and absolute magnitudes of BHB stars are revisited in the light of new evolutionary Horizontal Branch models.
Entanglement evolution of two remote and non-identical Jaynes-Cummings atoms
S. Chan,M. D. Reid,Z. Ficek
Physics , 2008, DOI: 10.1088/0953-4075/42/6/065507
Abstract: A detailed treatment of the entanglement dynamics of two distant but non-identical systems is presented. We study the entanglement evolution of two remote atoms interacting independently with a cavity field, as in the double Jaynes-Cummings (JC) model. The four-qubit pairwise concurrences are studied, allowing for asymmetric atom-cavity couplings and off-resonant ineractions. Counter to intuition, imperfect matching can prove advantageous to entanglement creation and evolution. For two types of initial entanglement, corresponding to spin correlated and anti-correlated Bell states \Phi and \Psi, a full, periodic and directed transfer of entanglement into a specific qubit pair is possible, for resonant interactions, depending on the choice of relative couplings. Furthermore, entanglement transfer and sudden death (ESD) can be prevented using off-resonant interactions, although for some initial states, detunings will trigger an otherwise frozen entanglement, to allow a full entanglement transfer. We confirm a conservation rule governing the pairwise entanglement between the non-interacting systems, that for the initial state \Psi the sum of the square of these concurrences (SSC) is conserved. For \Phi, the total SSC is reduced periodically, even to zero in some cases, to reveal a complete and abrupt loss of all non-local pairwise entanglement.
Conservation rules for entanglement transfer between qubits
S. Chan,M. D. Reid,Z. Ficek
Physics , 2008,
Abstract: We consider an entangled but non-interacting qubit pair a_{1} and b_{1} that are independently coupled to a set of local qubit systems, a_{I} and b_{J}, of 0-bit value, respectively. We derive rules for the transfer of entanglement from the pair a_{1}-b_{1} to an arbitrary pair a_{I}-b_{J}, for the case of qubit-number conserving local interactions. It is shown that the transfer rule depends strongly on the initial entangled state. If the initial entanglement is in the form of the Bell state corresponding to anti-correlated qubits, the sum of the square of the non-local pairwise concurrences is conserved. If the initial state is the Bell state with correlated qubits, this sum can be reduced, even to zero in some cases, to reveal a complete and abrupt loss of all non-local pairwise entanglement. We also identify that for the nonlocal bipartitions A-b_{J} involving all qubits at one location, with one qubit b_{J} at the other location, the concurrences satisfies a simple addition rule for both cases of the Bell states, that the sum of the square of the nonlocal concurrences is conserved.
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