Micrometeoroids and debris on LDEF

Two experiments within the French Cooperative Payload (FRECOPA) and devoted to the detection of cosmic dust were flown on the Long Duration Exposure Facility (LDEF). A variety of sensors and collecting devices have made possible the study of impact processes on dedicated sensors and on materials of technological interest. Examination of hypervelocity impact features on these experiments gives valuable information on the size distribution and nature of interplanetary dust particles in low-Earth orbit (LEO), within the 0.5-300 micrometer size range. However no crater smaller than 1.5 microns has been observed, thus suggesting a cut-off in the near Earth particle distribution. Chemical investigation of craters by EDX clearly shows evidence of elements (Na, Mg, Si, S, Ca, and Fe) consistent with cosmic origin. However, remnants of orbital debris have been found in a few craters; this can be the result of particles in eccentric orbits about the Earth and of the 8 deg offset in the orientation of LDEF. Crater size distribution is compared with results from other dust experiments flown on LDEF and with current models. Possible origin and orbital evolution of micrometeoroids is discussed. Use of thin foil detectors for the chemical study of particle remnants looks promising for future experiments

Never been industrialized: a tale of African structural change

Africa is a case of structural change without industrialization and without diversification. Agriculture�s decline was matched by an increase in services and non-manufacturing industry, with manufacturing remaining low and stagnant throughout the post-colonial period. To what extent do these patterns of structural change account for the weak growth dynamics observed in the continent? We provide evidence that what is damaging for growth in Africa is not the expansion in services, but rather the reallocation of economic activity from agriculture to non-manufacturing industry. Because non-manufacturing industry is mainly mining, our results point to a form of resource curse.

Study of cosmic dust particles on board LDEF: The FRECOPA experiments AO138-1 and AO138-2

Two experiments, within the French Cooperative Payload (FRECOPA) and devoted to the detection of cosmic dust, were flown on the LDEF. A variety of sensors and collecting devices have made possible the study of impact processes on materials of technological interest. Preliminary examination of hypervelocity impact features gives valuable data on size distribution and nature of interplanetary dust particles in low earth orbit, within the 0.5 to 300 micrometer size range. Most of the events detected on the trailing face of LDEF are expected to be the result of impacts of meteoritic particles only. So far, chemical analysis of craters by EDS clearly shows evidence of elements (Na, Mg, Si, S, Ca, and Fe) consistent with cosmic origin. Systematic occurrence of C and O in crater residues is an important result, to be compared with the existence of CHON particles detected in P-Halley comet nucleus. Crater size distribution is in good agreement with results from other dust experiments flown on LDEF. However, no crater smaller than 1.5 micron was observed, thus suggesting a cutoff in the near earth particle distribution. Possible origin and orbital evolution of micrometeoroids is discussed

Future career plans of Malawian medical students: a cross-sectional survey.

BACKGROUND: Malawi has one of the lowest physician densities in the world, at 1.1 doctors per 100,000 population. Undergraduate training of doctors at the national medical school has increased considerably in recent years with donor support. However, qualified doctors continue to leave the public sector in order to work or train abroad. We explored the postgraduate plans of current medical students, and the extent to which this is influenced by their background. METHODS: A self-administered questionnaire was developed after discussion with students and senior staff. This included questions on background characteristics, education before medical school, and future career plans. This was distributed to all medical and premedical students on campus over 1 week and collected by an independent researcher. One reminder visit was made to each class. Chi-squared tests were performed to investigate the relationship of student characteristics with future career plans. RESULTS: One hundred and forty-nine students completed the questionnaire out of a student body of 312, a response rate of 48%. When questioned on their plans for after graduation, 49.0% of students plan to stay in Malawi. However, 38.9% plan to leave Malawi immediately. Medical students who completed a 'premedical' foundation year at the medical school were significantly more likely to have immediate plans to stay in Malawi compared to those who completed A-levels, an advanced school-leaving qualification (P = 0.037). Current premedical students were slightly more likely to have immediate plans to work or train in Malawi compared to medical students (P = 0.049). However, a trend test across all the years was not significant. When asked about future plans, nearly half of students intend to work or train outside Malawi. CONCLUSIONS: The majority of respondents plan to leave Malawi in the future. The effectiveness of the substantial upscaling of medical education in Malawi may be diminished unless more medical students plan to work in Malawi after graduation

Global public health training in the UK: preparing for the future.

BACKGROUND: Many major public health issues today are not confined by national boundaries. However, the global public health workforce appears unprepared to confront the challenges posed by globalization. We therefore sought to investigate whether the current UK public health training programme adequately prepares its graduates to operate in a globalized world. METHODS: We used mixed methods involving an online cross-sectional survey of UK public health trainees on the international content of the Faculty of Public Health's written examination, a qualitative review of the Faculty's 2007 training curriculum and a questionnaire survey of all training deaneries in the UK. RESULTS: We found that global health issues are not addressed by the current training curriculum or in the written examination despite trainee interest for this. Many of the deaneries were also unreceptive to international placements. CONCLUSIONS: Despite the recognized educational legitimacy of global health placements and the favourable UK policy context, the opportunities and international content of public health training remain limited. In order to retain its position as a leader in the field of public health, the UK needs to adapt its training programme to better reflect today's challenges

Erosion Impacts from Recreation in the Enchanted Tower Climbing Area, New Mexico

There is a threat to the health of watersheds beyond natural occurrences. This threat results from human recreational impacts. There are many ways in which watersheds can be managed and protected to better meet human needs for water, food, and other natural resources, including management of recreational activities, both today and tomorrow. In Thompson Canyon along Forest Road 59A, a rock climbing area has received national and international recognition. It is heavily used during all seasons. The National Forest Service writes, This use has had a negative impact on surrounding areas. There are several concerns regarding the Thompson Canyon Rock Climbing area: campers have denuded much of the adjacent meadow area, a potential health hazard exists because there are no sanitary facilities, there is no right of way on Forest Road 59A, there are threatened and endangered species concerns, and a lack of developed parking (CNF 2000). Typical land uses in National Forests include wildlife habitat, hunting, livestock grazing, agriculture, mining, timber production, recreational opportunities and aesthetic virtues. National forest land is generally managed under a multi-use concept. The objective of multi-use concept is to manage the various natural resources for the most beneficial combination of present and future uses (Brooks, et al., 1997). Likewise, the Thompson Canyon Watershed has been managed under the Cibola National Forest. Since 1987, when land uses in the canyon began to drastically change, Management was never updated or reformed to meet these changing conditions. Simple management techniques can considerably reduce erosion rates to more sustainable levels, without compromising the recreational values that this canyon beholds

There is Always Hope: The Essence of Spiritual Care

There Is Always Hope: The Essence of Spiritual Care: Tessie Mandeville, Chaplain, PeaceHealth St Joseph\u27s Medical Center Objectives: Understand a working definition of spirituality and how it is an essential component of wholeness Distinguish between “hope”, “cure”, and “optimism” Describe recent articles on the science of hope and how hope protects the brain Conclude that there is reason (and science) for hop