Impact of the FTSE4Good Index on firm price: an event study

This paper examines whether corporate financial performance is affected by public endorsement of environmental and social performance. Event study methodology, which relies on the notion of market efficiency, is used to examine the relationship between positive and negative announcements and changes in share prices or daily returns. Inclusion in and deletion from the FTSE4Good UK Index is used as a proxy measure for good (poor) corporate social responsibility. The abnormal or unexpected daily returns associated with an event are calculated and their significance tested. The results show a trend towards positive and negative announcements having the expected effects on daily returns. But these movements are not significant and the data do not suggest that a firm's presence on the index brings it any significant financial return for signalling its corporate social responsibility.     

四川西昌盆地下二叠统层序特征及充填模式

四川西昌盆地下二叠统的地层划分对比争议较大,油气勘探程度低。本文通过详细的露头层序地层学研究,结合层序地球化学方法和原理,对西昌盆地下二叠统进行了层序划分和对比,结果表明：西昌盆地下二叠统地层可划分为1 个二级层序、2 个层序组和6 个三级层序;P₁q 层序组构成下二叠统二级层序的LST 和TST,层序4 下部发育的（茅口组底部）凝缩层相当于二级层序的最大海泛面,而P₁m 中上部（包括层序4 中上部、层序5、6）则构成HST;西昌地区下二叠统层序发育形成过程,总体表现为海平面上升和盆地不断向古陆超覆;沉积序列、古氧相含量、锶含量、碳氧同位素和TOC 的变化旋回揭示西昌盆地早二叠世经历了六次三级海平面变化旋回（六个三级层序）,在华南地区乃至全球范围内均可进行对比;建立的层序充填模式揭示出早Hessian 早期全球海平面上升,盆地不断向古陆超覆,奠定了早二叠世西昌海域盆地的轮廓,Roadian 早期海平面上升达到最高位,并沉积一套整个华南均可对比的眼球状灰岩或页状藻灰岩,Capitanian 晚期全球构造海平面下降,结束了西昌地区克拉通盆地的演化阶段。     

量化计算在爆炸危险区域划分中的应用

爆炸危险区域附加2区的划分是国标强制性要求,介绍了泄漏计算的模型和关键参数的选取,利用泄漏扩散计算模型对爆炸危险区域附加2区的划分作出判断,通过计算示例解释模型的应用。     

太湖西岸典型控制单元污染物排放核定研究

文章现以宜兴市为例,进行太湖西岸典型控制单元污染物排放核定的研究.结合水污染管理现状,完成了可操作的、面向排污许可证实施的宜兴流域控制单元划分、污染物排放量核定、水质响应关系建立和水环境容量测算与分配等水质目标管理体系,为宜兴市及整个太湖流域的水污染控制与治理方案提供方法论的指导.     

A Sediment Budget for an Urbanizing Watershed, 1951‐1996, Montgomery County, Maryland,U.S.A.1

Abstract: Despite widespread interest, few sediment budgets are available to document patterns of erosion and sedimentation in developing watersheds. We assess the sediment budget for the Good Hope Tributary, a small watershed (4.05 km²) in Montgomery County, Maryland, from 1951‐1996. Lacking monitoring data spanning the period of interest, we rely on a variety of indirect and stratigraphic methods. Using regression equations relating sediment yield to construction, we estimated an upland sediment production of 5,700 m³ between 1951 and 1996. Regression equations indicate that channel cross‐sectional area is correlated with the extent of development; these relationships, when combined with historical land use data, suggest that upland sediment yield was augmented by 6,400 m³ produced by enlargement of first‐order and second‐order stream channels. We used dendrochronology to estimate that 4,000 m³ of sediment was stored on the floodplain from 1951‐1996. The sediment yield from the watershed, obtained by summing upstream contributions, totals 8,100 m³ of sediment, or 135 tons/km²/year. These results indicate that upland erosion, channel enlargement, and floodplain storage are all significant components of the sediment budget of our study area, and all three are approximately equal in magnitude. Erosion of “legacy” floodplain sediments originally deposited during poor agricultural practices of the 19th and early 20th Centuries has likely contributed between 0 and 20% of the total sediment yield, indicating that these remobilized deposits are not a dominant component of the sediment yield of our study area.     

长江,嘉陵江重庆城区段流管划分及其水力学参数的确定

用作水流平面图的方法来计算河流累积流量，根据确定的流管系数对累积流量曲线进行分割，求得二维水质数学模型所需的流管宽度，水深和平均流速等水力学参数。     

岸线资源评估、空间管控分区的理论与方法——以长江岸线资源为例

岸线资源由于其所处水陆交互带的特殊地理位置,成为国土空间和国土资源的重要组成部分,逐步引起各界的重视和关注。而依托于长江黄金水道长江岸线资源发挥着重要的经济价值,随着长江大保护战略实施其生态价值愈加凸显。从岸线资源的概念内涵和特征分类出发,构建岸线资源价值评估的理论框架和指标体系,以长江岸线为例开展岸线资源经济功能价值和生态功能价值评价,并探索岸线资源分区管控方案,提出空间管控分区对策建议,以期丰富和拓展自然资源理论体系及研究范例,为长江经济带及全国其他地区岸线资源调查评估及管控分区提供参考借鉴。     

县域棉花信息遥感提取与棉田精确化管理分区研究

棉田信息化的精确管理是提高棉花生产管理水平及我国数字农业发展的客观需求。论文以山东省夏津县为研究区,选取棉花4个不同生长期的HJ-1卫星遥感影像,通过物候历分析和主要农作物的光谱特征,确定棉花识别最佳时相,建立提取模型,获取棉花种植区信息。建立棉花花铃期遥感影像的特征光谱指数,并与实测的5种主要土壤养分数据结合,运用相关分析、 主成分分析和K均值聚类分析方法,划分棉花管理区,并对分区结果的合理性进行差异显著性评价分析。结果显示:棉花种植区提取的最佳时相为蕾期,提取精度达到93%以上;优化土壤调节植被指数(OSAVI)能够较好地反映棉花的长势信息,同时与土壤养分具有显著的相关性;利用主成分分区指标将研究区棉田划分为3个管理区:管理一区占总棉田面积的24.67%,土壤有机质和氮磷钾含量最高,棉花长势旺盛;管理二区占47.02%,土壤养分含量中等,棉花长势一般;管理三区占28.31%,土壤肥力最低,棉花长势较差;各管理分区内土壤养分的变异系数都显著减小,分区间土壤养分和光谱指数均值差异显著,显示了分区的合理性。该研究可为实时准确的棉花栽培管理与决策提供科学依据。     

Effects of uncertainty, transmission type, driver age and gender on brake reaction and movement time

PROBLEM: Braking time (BT) is a critical component in safe driving, and various approaches have been applied to minimize it. This study analyzed the components of BT in order to assess the effects of age, gender, vehicle transmission type, and event uncertainty, on its two primary components, perception-reaction time and brake-movement time. METHOD: Perception-reaction time and brake-movement time were measured at the onset of lights for 72 subjects in a simulator. The six experimental conditions were three levels of uncertainty conditions (none, some, and some + false alarms) and two types of transmission (manual and automatic). The 72 subjects, half male and half female, were further divided into three age groups (mean of 23, 30, and 62 years). Each subject had 10 trials in each of the three levels of uncertainty conditions. RESULTS: Transmission type did not significantly affect either perception-reaction time or brake-movement time. Perception-reaction time increased significantly from 0.32 to 0.42 s (P < .05) as uncertainty increased but brake-movement time did not change. Perception-reaction time increased (from 0.35 to 0.43 s) with age but brake-movement time did not change with age. Gender did not affect perception-reaction time but did affect brake-movement time (males 0.19 s vs. females 0.16 s). IMPACT ON INDUSTRY: At 90 km/h, a car travels 0.25 m in 0.01 s. Consequently, even such small effects multiplied by millions of vehicle-kilometers can contribute to significant savings in lives and damages.     

大西南旅游资源的评价与开发

大西南的旅游资源丰富而独特，但开发程度低、经营粗放、发展整体性差、组合效益低．本文根据近年来的研究，从大西南的整体对其旅游资源进行分区及评价、并分析其开发的市场条件，提出了开发途径。