司家营铁矿区两期褶皱及控矿作用分析

通过司家营铁矿区地质构造的理论分析和实践验证,得出整个矿区的褶皱构造轮廓和构造形式。根据此理论,在2008年补勘中,铁矿石增加上亿吨储量,为经济的发展提供了更多的动力,并且对以后矿山生产开发具有重要意义。     

Life Expectancies for Small Areas: A Bayesian Random Effects Methodology

Monitoring small area contrasts in life expectancy is important for health policy purposes but subject to difficulties under conventional life table analysis. Additionally, the implicit model underlying conventional life table analysis involves a highly parametrized fixed effect approach. An alternative strategy proposed here involves an explicit model based on random effects for both small areas and age groups. The area effects are assumed to be spatially correlated, reflecting unknown mortality risk factors that are themselves typically spatially correlated. Often mortality observations are disaggregated by demographic category as well as by age and area, e.g. by gender or ethnic group, and multivariate area and age random effects will be used to pool over such groups. A case study considers variations in life expectancy in 1 118 small areas (known as wards) in Eastern England over a five-year period 1999–2003. The case study deaths data are classified by gender, age, and area, and a bivariate model for area and age effects is therefore applied. The interrelationship between the random area effects and two major influences on small area life expectancy is demonstrated in the study, these being area socio-economic status (or deprivation) and the location of nursing and residential homes for frail elderly.     

LED简介及其在汽车灯具设计中的作用

随着广大汽车消费者审美水平的不断提高,汽车不再是单纯的代步工具,还是时尚和潮流的最好的体现。汽车灯具作为车身画龙点睛之笔,对于汽车整体造型的完美体现起到至关重要的作用,而在灯具的设计过程中,光源的选择在一定程度上限制着灯具整体设计的自由度。文章简单介绍了LED应用于汽车灯具的优势,概述了LED在车灯行业的发展趋势。     

Strategies for online communities

This study examines the participation of firms in online communities as a means to enhance demand for their products. We begin with theoretical arguments and then develop a simulation model to illustrate how demand evolves as a function of interpersonal communication and a firm's chosen strategy. In this model, the firm's strategy involves allocating advocates who promote its product in online communities. Our model results point to some key parameters informing firms' strategies when social learning processes shape demand. Copyright © 2008 John Wiley & Sons, Ltd.     

Estimating the Half-life of Advertisements

The effectiveness of an advertisement wears out over time; eventually, it becomes totally ineffective. The author proposes a concept for measuring the lifetime of an advertisement and derives closed-form expressions for it under certain conditions. In addition, the author distinguishes the proposed concept, the half-life of an advertisement, from the prevalent notion of the duration of advertising effects. More importantly, the information on the half-life of ads is actionable from a managerial standpoint, whereas that on the duration of advertising effect is hypothetical. To enable advertisers to estimate the half-life of their ads, the author describes an estimation approach and illustrates its use by applying it to the advertising of the Dockers® brand of Levi Strauss and Company. Substantively, the lifetime of advertisements for the Dockers® brand is about three months. Thus, advertisers are well-advised to periodically estimate the half-life of their ads, so that they can plan the timing to replace worn out advertisements.     

监管制度、行业属性与企业环境投资——基于行业差异的影响因素识别与解析

本文运用固定效应模型和随机效应模型,对行业监管制度、行业属性与企业环境投资之间的关系进行实证研究,剖析基于行业差异的企业环境投资驱动因素。结果表明行业监管制度对于提升企业环境投资水平的作用未得到充分发挥,重污染企业并没有比非重污染企业投入更多的环保资金,重污染行业属性未增强监管制度对企业环境投资的促进作用;企业环境投资水平会随着企业规模的壮大、发展能力的提升而显著提高,盈利能力、盈余质量较好的企业环境投资水平相对较高,成长性较好的企业环境投资水平反而较低;非重污染行业中,营运能力与企业环境投资正相关,发展能力与重污染企业环境投资负相关,与非重污染企业正相关,偿债能力对企业环境投资的影响有限。     

Does engagement in corporate social responsibility provide strategic insurance‐like effects?

Research summary : This study examines whether the stock and bond prices of firms engaging in corporate social responsibility (CSR) can benefit from insurance‐like effects during occurrences of negative events. Our results suggest that in the face of negative events, engagement in CSR on a continuous, long‐term basis provides insurance‐like effects on both the stock and bond prices of firms. Nevertheless, the effects are found to quickly disappear following the occurrence of a second, or subsequent, negative event. Although our results clearly indicate that firms need to allocate some of their available resources to long‐term strategic CSR activities, managers must also realize that in a crisis communication, they will probably be able to use their CSR claims on one occasion only. Managerial summary : The purpose of this article is to examine whether firms engaging in corporate social responsibility (CSR) can benefit from insurance‐like effects during occurrences of negative events. We find that on the occurrence of a negative event, long‐term CSR engagement does have insurance‐like effects. We also find that these insurance‐like effects may quickly disappear following the occurrence of a second negative event. Managers of firms with a long history of CSR activities need to realize that in a crisis communication, they can probably use their claims of adherence to CSR only once. Copyright © 2015 John Wiley & Sons, Ltd.     

Shareholder perceptions of the changing impact of CEOs: Market reactions to unexpected CEO deaths, 1950–2009

Research summary : Despite a number of studies highlighting the important impact Chief Executive Officers (CEOs) have on firms, several theoretical and methodological questions cloud existing findings. This study takes an alternative approach by examining how shareholders' perceptions of CEO significance have changed over time. Using an event study methodology and a sample of 240 sudden and unexpected CEO deaths, we show that absolute (unsigned) market reactions to these events in U.S. public firms have increased markedly between 1950 and 2009. Our results indicate that shareholders act in ways consistent with the belief that CEOs have become increasingly more influential in recent decades. Managerial summary : With Chief Executive Officers (CEOs) facing increased scrutiny and receiving ever‐increasing pay packages, substantial debate exists about their overall contribution to firm outcomes. While prior research has sought to calculate the proportion of firm outcomes attributable to the CEO, this study takes an alternative approach by using the “wisdom of the crowds” to assess how shareholders think about the importance of CEOs. Our study finds that shareholders, perhaps the most financially motivated stakeholder, view CEOs as increasingly important drivers of firm outcomes, good and bad, versus their peers from decades earlier. Notably, market reaction to the unexpected death of a CEO has increased steadily over the last six decades, highlighting the importance of succession planning and supporting, at least partially, the increased compensation given today's top executives. Copyright © 2016 John Wiley & Sons, Ltd.     

Inducing value and institutional learning effects in stated choice experiments using advanced disclosure and instructional choice set treatments

This article analyses the effect of inducing institutional and value learning in a choice experiment survey concerning food safety. Respondents were subjected to two types of treatments, namely, Advance Disclosure (ADV) and Instructional Choice Set (ICS). Employing a split‐sample setup, we test the effect of providing ICS and ADV in two treatment groups relative to a control group where learning is not induced. We further test and compare the effects of ADV and ICS directly against each other. We find some evidence that ICS reduces institutional uncertainty as intended. Moreover, the results suggest that both ICS and ADV could potentially remove a gender‐specific status‐quo bias.     

黄土高原土地利用变化特征及其环境效应

研究目的:基于黄土高原近30余年来土地利用/植被覆盖变化(LUCC),分析该地区LUCC及其环境效应,为区域生态环境与社会经济的可持续发展政策提供科学依据。研究方法:地统计和趋势分析等。研究结果:(1)黄土高原土地利用结构整体上未发生变化,仍以草地、耕地和林地为主,但植被覆盖度提升显著;(2)黄土高原LUCC受气候变化和人类活动共同影响,影响程度存在区域性差异,其中黄土高原中部丘陵沟壑区主要由人类活动导致;(3)黄土高原LUCC对地表径流、土壤侵蚀、土壤水分及碳循环等生态环境过程将产生长期的影响,植被恢复在发挥生态效益的同时对区域生态环境产生消极的作用。研究结论:黄土高原植被生产力已接近水资源承载力阈值,提升人工植被稳定性、促进水资源平衡仍为现阶段促进黄土高原可持续发展的主要课题。