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201.
Roger Launius 《Astropolitics》2013,11(3):277-322
The loss of the Space Shuttle Columbia on 1 February 2003 brought to the fore the sad history of the Space Shuttle's origins, evolution, operation, and the continuing challenge of space access. The crisis that emerged in human access to space because of the accident was greater than any experienced since the end of the Apollo program more than thirty years earlier. This essay explores the origins and operations of the Space Shuttle, the varied efforts to build a successor vehicle versus upgrading the shuttle fleet, and suggests that the first decade of the twenty-first century promises to offer both serious challenges and enormous potential for the development of new launch vehicles that may finally achieve the long-held dream of reliable, affordable access to space. The essay ends by asking whether or not the half-hearted quest for a shuttle replacement might not portend the demise human spaceflight for the United States. 相似文献
202.
Roger Sibeon 《政治学》1999,19(3):139-144
It is appropriate that social scientists should develop explicit conceptualisations of agency, structure and social chance, these being three major dimensions of social and political life. The agency–structure debate, which refers to theoretical and ontological issues that tend not to be explicitly discussed by political scientists, is an important interdisciplinary starting point for conceptual and empirical work involving collaboration between political scientists and sociologists. Following a theoretical review of agency, structure and chance, it is argued that empirical research concerned with the study of politics and policy – indeed, social scientific research on any topic – should employ an ontology and methodology that focuses on the dynamics of interaction between agency, structure and social chance. 相似文献
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Journal of Youth and Adolescence - 相似文献
207.
Roger Williams David V. Bates 《Canadian public administration. Administration publique du Canada》1976,19(4):603-632
Abstract. The paper focuses on Canadian decisions involving technical issues. The inherent difficulties associated with the application of technical advice and the need to secure public accountability for related government action are both discussed. It is suggested specifically that although there has been a significant governmental response to the problem of man-made hazards, much remains to be achieved. The general difficulties with the concepts of ‘public accountability’ and ‘technical advice’ are reviewed, and some observations are made on the idea of ‘risk’ The particular Canadian problems dealt with include those derived from the constitutional and overall political situation. The case of asbestos is introduced especially to illustrate inter-provincial inadequacies. Intra-provincial shortcomings are brought out by reference to the dangers resulting from lead. Note is taken of the limitations imposed by the legal system, and of the issues precipitated by Canada's industrial structure. The foreign policy dimension is recognized. The vinyl chloride issue is used to illustrate the long-term and yet fundamental nature of many risks. Recommendations are finally made concerning the roles of the Environmental Advisory Council and of the National Research Council's Associate Committee on Scientific Criteria for Environmental Quality, and an attempt is made to identify the detailed responsibilities which should fall to the federal government, both in regard to general and occupational standards covering man-made hazards, and more generally in regard to all the ways in which the general and specific publics can be safeguarded. Sommaire. L'auteur traite plus particulièrement des décisions relatives aux questions techniques. Il expose les difficultés inhérentes à l'application des conseils techniques et le besoin d'assurer le droit de regard du public sur les mesures gouvernementales. Il considère en particulier, qu'en dépit de la réaction positive du gouvernement face au problème des risques d'origine humaine, il reste encore beaucoup a faire. Il examine les difficultés générales que présentent les concepts du « droit de regard du public » et des « conseils techniques » et il présentent certaines observations sur la notion de » risque ». Les problèmes plus particulièrement canadiens dont il s'occupe sont la consequence de la situation constitutionnelle et de la situation politique générale. Il utilise le cas de l'amiante pour illustrer les carences interprovinciales. Ces mêmes carences sont évidentes, également, si l'on considère les dangers que présente le plomb. Il prend note des limites imposées par la loi et les problèmes posés par la structure industrielle du Canada. Il reconnait aussi la dimension politique étrangère. L'auteur se sert de la question du chlorure de vinyle pour illustrer le caractère à long terme et pourtant fondamental d'un grand nombre de dangers. Il fait des recommandations quant aux rôles du Conseil consultatif sur l'environnement et du comité du cnr sur les normes scientifiques pour la qualité de l'environnement. Il dégage enfin les différentes responsabilités du government fédéral, quant aux normes générales et professionnelles couvrant les risques créés par l'homme et, d'une façon plus large, quant aux moyens de protéger le public, qu'il s'agisse du grand public ou de groupes particuliers. 相似文献
208.
Retrospective review of hanging suicides in individuals aged ≤ 17 years was undertaken at Forensic Science South Australia, Australia, over two 5-year periods: 1995-1999 and 2005-2009. Seven cases of hanging suicides were identified from 1995 to 1999, with a further 14 cases from 2005 to 2009, an increase of 100% (p < 0.001). Hanging accounted for 33.3% of all suicides in this age group (7/21) from 1995 to 1999, compared with 93.3% of the total number of suicides (14/15) in the second 5-year period. In contrast, Australian national data from 1998 and 2008 showed a 30% decrease in hanging suicides in the young, from one case/100,000 population in 1998 to 0.7 in 2008. Cluster suicides occur in the young and are often initiated by direct communication. As it is possible that Internet-based social sites may facilitate this phenomenon, investigations should include an evaluation of the victim's Internet access given the potential risk of similar actions by peers. 相似文献
209.
Systemic lupus erythematosus is an autoimmune connective tissue disorder that affects multiple organs. While the clinical manifestations may vary in intensity over time and be associated with chronic disease, occasional cases occur where sudden and unexpected death has occurred. Cardiovascular disease is common, with accelerated atherosclerosis, intravascular thrombosis associated with antiphospholipid syndrome, and hypertensive cardiomegaly. Vasculitis with superimposed thrombosis may result in critical reduction in blood to vital organs, such as the heart and brain with infarction. Mesenteric ischemia may be caused by vasculitis, thrombosis, and accelerated atherosclerosis and may result in lethal intestinal infarction. Other diverse causes of sudden death include myocarditis, epilepsy, pulmonary hypertension, pulmonary thromboembolism, and sepsis. The autopsy evaluation of such cases requires careful examination of all organs with extensive histological sampling to include blood vessels, and microbiological sampling for bacteria, viruses, and fungi. 相似文献
210.
To determine whether vitreous humor sodium levels might be of use in evaluating deaths associated with immersion, samples of vitreous humor were prospectively evaluated at autopsy over a 4-year period from 2006 to 2009. There were 19 cases of saltwater immersion (age range 9-76 years; mean age 44 years; M:F, 2.8:1) and 16 freshwater immersions (age range 2-81 years; mean age 27 years; M:F, 2.2:1). In the group of saltwater drownings, vitreous humor sodium levels were elevated, ranging from 145 to 184 mM (mean = 160.2 ± 9.9 mM), and in the cases of freshwater drowning, the levels were reduced, ranging from 73 to 148 mM (mean = 129.8 ± 17 mM; p < 0.0001). Alterations in electrolyte levels may have been because of hemoconcentration or dilution from electrolyte fluxes in the lungs, or from passive diffusion during immersion. This study has demonstrated that vitreous sodium level is an easily performed test that may be a useful adjunct to the investigation of possible immersion deaths. 相似文献