"青龙奇迹"传播现象分析及其准确度探讨

在地震灾难频发及网络媒体迅速发展的背景下,"青龙奇迹"引起了公众的广泛关注和争议,其社会舆论影响不容忽视.以此为切入点,笔者一行利用2010年暑期社会实践在河北省青龙县、抚宁县进行了实地调研走访,结合学者论述、新闻报道,从灾难社会学和传播学角度,分析"青龙奇迹"传播现象,并对其准确度进行了探讨.     

基于粗糙集和IPA的煤矿生产物流系统安全影响因素分析

针对煤矿生产物流系统安全影响因素众多、各因素对煤矿安全影响作用复杂的问题,提出基于粗糙集和IPA定位分析法的煤矿生产物流系统安全影响因素分析模型。首先运用粗糙集属性重要度思想对煤矿安全影响因素进行排序,然后采用IPA定位分析法识别不同安全状态煤矿安全生产的制约因素,最后通过对河南义马煤业集团跃进煤矿进行实证分析验证模型的可行性。结果表明,各因素对煤矿安全影响的重要度由大到小排序为通风设施、通风安全监控、通风技术管理、排水设备配置、机电安全管理、排水技术人员配备(采掘关系)、采掘机械、排水机构设置、安全运输、应急救援、采掘技术管理,且对于不同安全状态等级的煤矿而言,制约其安全的主要因素也不相同。     

便携式X-荧光分析土壤的准确度和质量控制研究

测定标土能反映便携式X-荧光光谱仪的准确度,采用便携式X-荧光光谱仪测定了国内外七种标准土样,计算了测定结果的相对误差,直观地反映了便携式X-荧光光谱仪的准确度和灵敏度.借鉴EPA对便携式X-荧光光谱仪测定结果的质控要求,分析了部分测定结果得不到质量控制要求的原因,结合中国土壤环境质量标准一、二、三级标准,分析了便携式X-荧光光谱仪测定值在不同标准限值时的准确度和灵敏度.选取了铅冶炼周围的土壤,分析了现场测定由于土壤的不均匀性、粒度效应以及湿度给结果带来的误差.为便携式X-荧光光谱仪的质量控制和数据的准确恒量提供了依据.     

流动注射在线UV消解测定环境水体中的总氮研究

采用San++流动分析仪在线UV消解测定环境水体中的总氮,样品浓度在0.00~5.0 mg/L与峰高有良好的线性关系(r=0.999 6)。进行了标准样品考核和实际水样的流动注射法和国标方法的比对分析。实验结果表明:采用流动注射在线消解测定水中TN,其标样测定值均在保证值范围内,相对标准偏差小于3%;两种方法测定实际水样的结果无显著性差异且具有很好的一致性,加标回收实验的回收率在90.0%~97.7%之间,能满足地表水及排放废水中TN监测要求。     

4阶导数光谱法同时测定酚类及芳胺的统计性检验

介绍４阶导数光谱法同时测定污水中酚类及芳胺方法的统计性检验，通过样品加标回收实验以及Ｆ检验和ｔ检验证明该方法的精密度和准确度均优于国家环保局推荐的４－氨基安替比林先度法删酚和萘乙二胺偶氮光度法测芳胺的实验方法。     

THE INFLUENCE OF (x,y) UNCERTAINTY ON PREDICTION ERROR AND CONTOUR LINES FROM A THREE-DIMENSIONAL SURFACE1

ABSTRACT: In geohydrology, three-dimensional surfaces are typically represented as a series of contours. Water levels, saturated thickness, precipitation, and geological formation boundaries are a few examples of this practice. These surfaces start as point measurements that are then analyzed to interpolate between the known point measurements. This first step typically creates a raster or a set of grid points. In modeling, subsequent processing uses these to represent the shape of a surface. For display, they are usually converted to contour lines. Unfortunately, in many field applications, the (x, y) location on the earth's surface is much less confidently known than the data in the z dimension. To test the influence of (x, y) locational accuracy on z dimension point predictions and their resulting contours, a Monte Carlo study was performed on water level data from northwestern Kansas. Four levels of (x, y) uncertainty were tested ranging in accuracy from one arc degree-minute (± 2384 feet in the x dimension and ± 3036 feet in the y dimension) to Global Positioning Systems (GPS) accuracy (± 20 feet for relatively low cost systems). These span the range of common levels of locational uncertainty in data available to hydrologists in the United States. This work examines the influence that locational uncertainty can have on both point predictions and contour lines. Results indicate that overall mean error exhibits a small sensitivity to locational uncertainty. However, measures of spread and maximum errors in the z domain are greatly affected. In practical application, this implies that estimates over large regions should be asymptotically consistent. However, local errors in z can be quite large and increase with (x, y) uncertainty.     

FLOOD WARNINGS AND FLOOD RESPONSES FOR THE RED RIVER OF THE NORTH1

ABSTRACT The flooding conditions in the basin of the Red River of the North are reviewed in terms of the accuracy of the flood forecasts and the response of both the floodplain occupants and government agencies to these forecasts. The flood prediction methods in Canada and the United States are compared. The accuracy of these prediction measures for the major floods in recent history is reviewed. The differences between the way in which the American and Canadian authorities approach the flood emergencies are outlined. The accuracy of the forecasts are plotted against a number of parameters which reflect the efficiency of the flood fighting measures initiated by those flood forecasts. The significant features of these plots are discussed.     

全自动淋洗-智能蒸馏联合技术检测土壤中阳离子交换量

针对土壤中阳离子交换量检测国标方法的不足,介绍了一种全自动淋洗法结合自动智能一体化蒸馏的联合技术。通过对实际样品和6种土壤标样的比较实验,表明,淋洗时间设置为20 min、乙醇洗涤次数设置为4次、蒸馏液质量设置为130 g较佳,在该条件下,土壤标样及实际样品的相对标准偏差(0.87%~1.07%)远小于行业标准方法的标准偏差(3.87%~5.18%),方法准确度也均在保证值范围内。该方法自动化程度高、可操作性强且检测结果的准确度、精密度及重现性都符合标准规定,可满足大批量土壤样品分析要求。     

Gold Mining in the Greek “Village of Gaul”: Newspaper Coverage of Conflict and Discursive Positioning of Opposing Coalitions

The present study analysed media discourse on a gold mining controversy in Greece. Social actors shaped a pro-mining and an anti-mining coalition. The “village of Gaul” was a discursive resource used to depict conflict and it could denote either “resistance,” for anti-mining advocates, or “anarchy,” for pro-mining advocates. The same actor could be found to perform both the role of a powerful majority as well as the role of a repressed minority, which engaged varying scales of reference. Discursive positioning allowed for a switching among majority and minority roles. Each camp attempted to transform incalculable hazards into calculable risks and this was accompanied by a discursive appropriation of the past and the future of the study area. Social divide seems to have advanced discursive positioning of coalitions in a spiral-logic of interactionist confrontation at the cost of losing any common ground. Implications for environmental communication and environmental governance are discussed.