排序方式: 共有28条查询结果,搜索用时 201 毫秒
1.
淮河流域多闸坝河流COD综合衰减系数测算 总被引:4,自引:0,他引:4
提出在多闸坝河流上,利用枯水期断面化学需氧量同步监测数据测算COD综合衰减系数的方法,用该方法测算河南省辖河流域部分河流COD综合减系数在0.08-0.341/d。并用实际监测结果进行检验。 相似文献
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介绍广东核电站厂址降水特性分析的方法学,给出降水的气侯学统计以及降水率、降水持续时间的分布特征. 相似文献
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Isotopic measurements of the 34 m3/s discharge from the Fall River Springs of northern California indicate recharge from 50 km upgradient in high elevation regions of Medicine Lake Volcano. Age determinations suggest less than 20-year travel time. Data demonstrate Klamath Basin further north cannot be a recharge source. Mass balance calculations support that annual precipitation on the volcano supplies observed spring discharge, requiring 50%–75% recharge rates. Radiocarbon and δ13C of dissolved inorganic carbon indicate 30%–40% is derived from magmatic CO2. Measured excess 3He is also consistent with the presence of magmatic gas derived from the Quaternary Age Medicine Lake Volcano. 相似文献
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应用分形理论,研究了煤矿顶板运动过程中所表现的分形特征,提出了用顶板下沉速度的分数维值的变化预报顶板来压、冒落的方法,使得预报顶板来压、冒落的指标定量化成为可能,预报更加科学,把预报的理论与方法推进到新阶段。这对保障煤矿生产安全具有重要的应用价值。 相似文献
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针对一起电动单梁起重机吊具冲顶并引发起升电机坠落的起重作业事故,分析了事故起重机电气控制系统和现场紧急处置中存在的问题,指出了导致事故发生的直接原因和主要原因;并从完善起重机电气控制系统本质安全性和加强起重机械使用安全管理的角度提出了相应建议和意见,对预防类似事故的发生具有借鉴作用。 相似文献
6.
Introduction
Falls in older Australians are a significant public health issue with one in three older people falling one or more times each year.Method
Many fall prevention randomized controlled trials have been conducted in Australia as well as across the world.Results
The findings of these studies now constitute a substantial evidence base that can provide direction for health and lifestyle interventions for preventing falls in older people. This research evidence has contributed to health policy in Australia to some extent, but is yet to be widely implemented into practice. This opinion piece overviews previous policy initiatives and describes a new Partnership research program funded by the Australian National Health and Medical Research Council (NHMRC), which seeks to further influence health policy and address the ongoing research-practice gap. 相似文献7.
Rubenstein LZ Vivrette R Harker JO Stevens JA Kramer BJ 《Journal of Safety Research》2011,42(6):493-499
Background
Falls are a common, serious, and often unrecognized problem facing older adults. The objective of this study was to provide an initial clinical and statistical validation for a public health strategy of fall risk self-assessment by older adults using a Fall Risk Questionnaire (FRQ).Methods
Adults age 65 + (n = 40) were recruited at a Los Angeles Veterans Affairs (VA) medical facility and at a local assisted living facility. Participants completed the FRQ self-assessment and results were compared to a “gold standard” of a clinical evaluation of risks using the American/British Geriatrics Society guidelines to assess independent predictors of falls: history of previous falls, fear of falling, gait/balance, muscle weakness, incontinence, sensation and proprioception, depression, vision, and medications. For the comparison, we used an iterative statistical approach, weighing items based on relative risk.Results
There was strong agreement between the FRQ and clinical evaluation (kappa = .875, p < .0001). Individual item kappa values ranged from .305-.832. After dropping one FRQ item (vision risk) because of inadequate agreement with the clinical evaluation (kappa = .139, p = .321), the final FRQ had good concurrent validity.Conclusions
The FRQ goes beyond existing screening tools in that it is based on both evidence and clinical acceptability and has been initially validated with clinical examination data. A larger validation with longitudinal follow-up should determine the actual strength of the FRQ in predicting future falls. 相似文献8.
乡镇铝厂大气氟污染对区域冬小麦生长影响的研究 总被引:2,自引:0,他引:2
通过对郑州市某乡镇电解铝厂附近的参气,土壤及冬小麦等生态因素含氟量的分析与研究,表明:(1)铝厂所排放的化物是造成冬小麦减产的主要原因:(2)冬小麦各部位器官含量与距污染源的距离呈负相关;(3)对电解铝生产过程排放的气态氟化物应采取相应的治理和防护措施。 相似文献
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10.
Susan M. Moore William L. Porter Patrick G. DempseyAuthor vitae 《Journal of Safety Research》2009,40(6):455-460