PubMed · 14325129
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J H MARKS. FLAIL CHEST.. https://pubmed.ncbi.nlm.nih.gov/14325129/
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Accidental release and dispersion of toxic gases were always major hazards for public health and safety that process industries had to deal with. Real terrain dispersion simulation for risk analysis purposes poses specific difficulties related to complex turbulence phenomena development, especially when obstructions are found into the flow region. In this paper, several turbulence models are tested and compared against experimental data of dense vapor dispersion, in order to decide for their suitability for simulating such flows. Computations were carried out using the computational fluid dynamics (CFD) code CFX 5.6, while experimental data were obtained from Thorney Island large scale field trials. Computational results showed good agreement with experimental measurements indicating that CFDs provide a reliable means of estimating gas dispersion in real terrains.
BACKGROUND: Alcohol-related diseases and injuries pose a significant burden on hospital emergency departments (EDs). Recognized limitations of self-reported data suggest that previous single-year national studies may have underestimated the magnitude of this burden. METHODS: Data were obtained from the National Hospital Ambulatory Medical Care Survey for 1992 through 2000. Thirty-seven alcohol-related diagnoses and their corresponding alcohol-attributable fractions (AAFs) were used to estimate the number of ED visits attributable to alcohol. Diagnoses with an AAF of 1 were analyzed by age, sex, and race. Disposition to inpatient settings and alcohol screening also were examined. RESULTS: During these 9 years, there were an estimated 68.6 million (95% confidence interval [CI], 65.6 million to 71.7 million) ED visits attributable to alcohol, a rate of 28.7 (95% CI, 27.1-30.3) per 1000 US population. The number of alcohol-related visits increased 18% during this period. Visit rates for diagnoses with AAFs of 1 were highest for those who were aged 30 through 49 years, male, and black. From 1992 to 2000, these disparities remained stable for age group but significantly changed for sex (+22%) and race (-76%). Most patients with diagnoses with AAFs of 1 were not admitted to an inpatient unit, and the percentage of patients who underwent blood alcohol concentration testing was substantially lower than corresponding AAFs. CONCLUSIONS: Alcohol-related ED visits are approximately 3 times higher than previous estimates determined by physician documentation or patient disclosure of alcohol involvement. Rising trends, changing disparities, and suboptimal ED management of such visits are a call to action.
Antarctic exploration and research have led to some significant although localized impacts on the environment. Human impacts occur around current or past scientific research stations, typically located on ice-free areas that are predominantly soils. Fuel spills, the most common occurrence, have the potential to cause the greatest environmental impact in the Antarctic through accumulation of aliphatic and aromatic compounds. Effective management of hydrocarbon spills is dependent on understanding how they impact soil properties such as moisture, hydrophobicity, soil temperature, and microbial activity. Numbers of hydrocarbon-degrading bacteria, typically Rhodococcus, Sphingomonas, and Pseudomonas species for example, may become elevated in contaminated soils, but overall microbial diversity declines. Alternative management practices to the current approach of "dig it up and ship it out" are required but must be based on sound information. This review summarizes current understanding of the extent and effects of hydrocarbon spillage on Antarctic soils; the observed physical, chemical, and biological responses of such soils; and current gaps in knowledge.