Do Tighter Restrictions on Density Retard Development?

Williams (1991) builds a real-options model to investigate the timing and the scale decisions of property development. Williams asserts that tighter restrictions on density retard development. This article finds that there are some typos in Williams’s article such that his assertion does not hold in general. In particular, his assertion will not hold as long as the density restrictions are not set too low relative to the density level that would be chosen by landowners in the absence of any regulation.     

On the Out-of-Sample Importance of Skewness and Asymmetric Dependence for Asset Allocation

Recent studies in the empirical finance literature have reportedevidence of two types of asymmetries in the joint distributionof stock returns. The first is skewness in the distributionof individual stock returns. The second is an asymmetry in thedependence between stocks: stock returns appear to be more highlycorrelated during market downturns than during market upturns.In this article we examine the economic and statistical significanceof these asymmetries for asset allocation decisions in an out-of-samplesetting. We consider the problem of a constant relative riskaversion (CRRA) investor allocating wealth between the risk-freeasset, a small-cap portfolio, and a large-cap portfolio. Weuse models that can capture time-varying moments up to the fourthorder, and we use copula theory to construct models of the time-varyingdependence structure that allow for different dependence duringbear markets than bull markets. The importance of these twoasymmetries for asset allocation is assessed by comparing theperformance of a portfolio based on a normal distribution modelwith a portfolio based on a more flexible distribution model.For investors with no short-sales constraints, we find thatknowledge of higher moments and asymmetric dependence leadsto gains that are economically significant and statisticallysignificant in some cases. For short sales-constrained investorsthe gains are limited.     

Books Reviewed

Vosti, Stephen A., and Thomas Reardon, eds. Sustainability, Growth, and Poverty Alleviation: A Policy and Agroecological Perspective.
Swinbank, Alan, and Carolyn Tanner. Farm Policy and Trade Conflict: The Uruguay Round and CAP Reform.
Frisvold, George, and Betsey Kuhn, eds. Global Environmental Change and Agriculture: Assessing the Impacts.     

搞好核电投资控制工作

论述了核电投资控制的特点。项目投资大及投资控制在核电建设中所起的重要作用,并从核电投资的各个阶段对投资控制工作进行了分析,同时探讨了一些控制方法。     

外来颗粒尺寸、级配和浓度影响的动态模拟实验研究

采用岩心流动试验，研究了微粒运移堵塞的几个重要规律；介绍了关于微粒在多孔介质中运移堵塞规律方面的实验研究：采用室内模拟流体流动试验，研究了颗粒粒径、浓度对低渗透性砂岩（9～11md和19～21md）堵塞规律。     

核磁共振成像测井的质量控制及应用

核磁共振成像测井资料的取得是一个比较复杂的系统工程，合格资料的取得更是需要许多环节的紧密配合，广义的核磁共振成像测井质量控制包括很多方面，比如测前设计，仪器刻度与校验，资料采集，数据处理等。根据核磁共振成像测井质量控制的一般原则，重点探讨了MRIL-Prime型仪器的质量控制影响因素，阐明了质量控制的方法，提出了核磁测井参数设计的一般要求，以及核磁测井质量控制的一个应用实例。     

重力法在油罐含水和罐存测量中的应用

结合油田实际，提出了一种利用重力法测量油罐含水和罐存的方法，这种方法能够实时地监测油田成品油罐的含水、罐存等参数状态，方便管理，适应油田生产的需要。     

核恐怖事件及其后果的处置研究

本文从核恐怖事件的特征和潜在影响出发,分析了核恐怖事件的危机处置与后果处置间的区别与联系,给出了处置方法。重点对危机处置与后果处置的内容与方法进行了探讨。     

企业防范核事故风险的法律责任分析——以日本“福岛核事故”为视角

核能的开发利用在给人类带来巨大利益的同时也伴随着各种潜在的风险。对于核能产生的各种风险，政府、企业、国际组织和公众都有防范的责任。从福岛核事故的发生和发展情况来看，核企业在预防和应对核能风险方面负有不可推卸的责任。对企业防范核事故风险责任的适用原则和构成进行规范是我们尽量避免和减少核事故风险发生的有效手段。     

Standing out in the crowd: The effect of information clutter on consumer attention for front-of-pack nutrition labels

Whether and how information density on front-of-pack design affects consumers’ attention for nutrition labels is explored. The main manipulation concerned the number and type of nutrition labels (directive-, semi-, and non-directive), chromaticity (monochrome vs. traffic light color-coded scheme); number and type of additional design elements; and the distance between the label and additional design elements. Attention was measured by performance in visual search task. Performance was slower with increasing number of additional design elements, and when the label appeared in a dense rather than non-dense area. These effects were modulated by label type and chromaticity. The results show that information density is a key factor for consumer attention to (nutrition) information. Implications for policy makers and food producers who want to optimize package design layout and thus help consumers easily to find nutrition information displayed front of the pack are discussed.