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检验环境影响预测准确度统计方法的研究近况 总被引：2，自引：0，他引：2
开展环境影响评价工作近二十年来,国内外对预测结果准确度的检验尚无制定统一标准,而预测结果的准确与否,又直接影响到环境影响报告书的质量。为此,本文将国内外这方面的研究状况作以评论,以供从事环境影响评价和后评估的专业人员参考 相似文献
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金竹山土朱煤矿开采地表沉降规律与灰色预测模型研究 总被引：4，自引：1，他引：3
针对金竹山矿业公司土朱煤矿煤层赋存条件,依据采动理论的裂缝垂直分带模型,分析地表沉降和塌陷的机理;提出在采煤活动阶段应进行地表实际位移观测,经数据处理后得到地面沉降曲线,以确保地面人类活动的安全;在采煤活动后阶段则实施灰色预测地面沉降,即通过采煤活动阶段的地表实际观测数据为历史原始数据序列,建立灰色Logistic模型;并对采煤活动后阶段的地面沉降进行预测.精度检验表明:灰色Logistic模型预测精度高,利用该模型预测地面沉降可减少地面沉降监测经费和实时提供预警信息,以确保开采区域内人们生命财产安全. 相似文献
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Isabel María García‐Snchez María‐Elena Gmez‐Miranda Ftima David Lazaro Rodríguez‐Ariza 《Corporate Social Responsibility and Environmental Management》2019,26(6):1392-1406
Aware of the information needs of stakeholders, and of the important deficiencies often present in corporate social responsibility (CSR) reports on economic, social, and environmental issues, companies leading in sustainability have initiated a new communication strategy in which their CSR reports take into account both the Global Reporting Initiative (GRI) guidelines and the International Finance Corporation (IFC) Performance Standards, in an approach termed the GRI‐IFC disclosure strategy. We examine whether this innovative practice provides a better reflection of a firm's social and environmental dimensions and therefore improves the forecasts made by financial analysts, who are significant stakeholders in this respect. Our analysis of an unbalanced sample of 750 international companies, located in 19 countries and operating in 22 business sectors during the years 2011–2016, in which a logistic regression is applied to the panel data, reveals the existence of a two‐way relationship between the adoption of the GRI‐IFC disclosure strategy and the level of analyst coverage. Moreover, the use of this strategy, and the resulting increase in coverage, has a positive impact on the accuracy of analysts' forecasts. 相似文献
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Ram B. Jain 《毒物与环境化学》2016,98(1):137-148
National Health and Nutrition Examination Survey (NHANES) uses two tobacco use surveillance questionnaires. One is administered during an at-home interview (HI) and the other, during an examination session at a mobile examination center (MEC). NHANES data for the years 1999–2012 were used to evaluate the consistency of responses to tobacco surveillance questions in HI and MEC interview. In addition, accuracy of self-reported smoking status was evaluated. Of those who reported to be daily cigarette smokers during HI, 18.7% reported to be either some-day smokers or nonsmokers during MEC interview. Of those who reported to be some-day cigarette smokers during HI, 22.1% reported to be daily smokers and 17.5% reported to be nonsmokers. Also, 4.1% of those who reported to be nonsmokers during HI reported to be either daily or some-day smokers during MEC interview. Using serum cotinine measurements taken during MEC interview, 27.1% were found to be smokers and 72.9% were found to be nonsmokers. In general, a moderate to high agreement, as measured by the κ statistic, was found between the self-reported responses to tobacco use questions during the home and MEC interviews as well as between smoking statuses based on self-reported and serum cotinine measurements. 相似文献
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采用碱性过硫酸钾消解紫外分光光度法测定水中总氮时常出现空白值偏高、样品平行性较差、实验准确度不高等现象.为此,从总氮的测定过程出发,探讨了影响总氮测定的主要因素,有利于提高水质总氮测定的准确度.结果表明,分析试剂纯度、实验用水水质、器皿的清洗程度等对总氮的测定均有一定影响,适当延长消解时间与提高消解温度也有利于降低总氮的空白值.因此可通过优化各实验条件来提高实验的准确性,以保证实验室的设备仪器、检测人员和环境等条件满足分析要求. 相似文献
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准确测定高锰酸盐指数考核样的方法 总被引：1，自引：0，他引：1
根据长期的实际操作经验，要准确测定高锰酸盐指数值，在样品分析中，水浴时间不能少于35min；K值在0．980-1．010；滴定时温度保持在70℃。以提高测定结果的准确度。 相似文献