Assessing Health Risks Associated with DDT Residues in Soils in California: A Proposition 65 Case Study

Population growth in California has increased the pressure to convert agricultural land to commercial, industrial, or residential uses. In the ensuing property transactions, buyers and sellers must address the presence of toxic materials in soils such as pesticides, several of which are known to the State of California to cause cancer under Proposition 65. While this statute does not specifically address soil contaminants, the potential scope of its enforcement is sufficiently broad that owners of former agricultural properties may be obliged to provide warning of exposure to potential buyers, occupants, or construction workers about exposure to residues in soil from pesticide applications. However, Proposition 65 provides no guidance on how to assess exposures to chemicals in soil. The U.S. EPA Risk Assessment Guidance for Superfund (RAGS) provides a method for assessing soil-related exposure pathways that is consistent with the intent of Proposition 65. Using this approach, we have calculated the lifetime average concentrations of DDT in soil corresponding to the no-significant-risk level stipulated under Proposition 65 (1 × 10⁻⁵) for a hypothetical residential exposure scenario. The concentration of DDT in soil corresponding to a no-significant-risk ranges from 7.9-18.8 mg/kg, depending upon which exposure pathways are deemed to be complete for residential land use. It is argued that Proposition 65 forces the assessment and possible cleanup of such a situation through the threat of creating a health risk perception that could affect the market value of a property.     

中共八大邓小平关于党的纯洁性建设理论探索和启示简

邓小平同志在中共八大上所作的《关于修改党的章程的报告》,总结了建国七年以来执政党建设的经验,并根据党所面临的形势和任务,对如何保持党的思想纯洁、作风纯洁、组织纯洁、队伍纯洁等若干问题进行了理论探索。这对于当前进一步加强党的纯洁性建设具有重要的启示意义。主要包括：保持党的纯洁性,思想教育是基础,加强监督是关键,制度建设是保障。     

Impacted publics’ perceptions of crisis communication decision making

This study focused on qualitative analysis utilizing the grounded theory approach to explore how impacted publics connected to an organization’s business interests perceive the complexities of crisis communication decision making. Referencing the Boeing 737 MAX 8 crashes in October 2018 and March 2019, respectively, the researcher conducted interviews with participants either affiliated with Boeing publics or affiliated with an organization within the same industry that could conceivably be connected in a similar hypothetical context. Coding resulted in the emergence of Publics’ Expectations, which are those expectations that an impacted public has in an organizational crisis situation where it is affected by the crisis communication of a central organization, as the core category. This was further subcategorized into Cognitive Empathy (impacted public empathizes or understands elements that introduce central organization reluctance to communicate), Crisis Communication (impacted public expectations of central organization communication), and Decision Making (impacted public expectations of complicated decision making), with corresponding components for each subcategory. Although the findings support many of the prevailing notions in Situational Crisis Communication Theory (SCCT) and other crisis communication theories, this study found that impacted publics might have higher levels of empathy for organizational realities than previously understood that reframes culpability as responsibility for the plight of your publics, not necessarily immediate outright responsibility for the crisis. This offers insights for a practical approach to crisis communication that is inclusive of publics, yet still fair to the organization that has to also represent its own interests.     

Les gagnants et les perdants de l'emploi informel en Indonésie

Dans la plupart des études, les travailleurs de l’économie informelle sont présentés comme un tout homogène. Les auteurs considèrent pourtant qu'il peut y avoir parmi eux des gagnants et des perdants. En utilisant des régressions quantiles sur distribution non conditionnelle et des données issues d'une enquête auprès des ménages indonésiens (IFLS), ils estiment l’écart de rémunération entre travailleurs formels et travailleurs informels à différents points de la répartition des gains. Ils montrent que la pénalité de revenu aux dépens des travailleurs informels, manifeste et sensible pour certains d'entre eux, n'est pas systématique, confirmant ainsi la thèse de Fields (1990 et 2005) sur l'emploi informel hétérogène.     

THE TRADEOFF BETWEEN PERFORMANCE AND QUITTING IN HIGH POWER TOURNAMENTS

Tournaments may be characterized by the performance they induce as well as by the rate of quitting and dropouts of participants. Although most of the attention in the literature is on the performance induced by high power incentives, there are many daily situations in which dropouts and quitting are a major concern. Using a field experiment in schools and a model of dynamic tournament we examine the effect of different levels of rewards on the rate of quitting. Our experiment indicates that there is a possible tradeoff between performance and quitting. Strong incentives tournaments induced participants to exert more effort and exhibit a better performance but, at the same time, it induces a higher rate of quitting. We present a multi‐stage tournament model that gives rise to a similar characterization.     

社会主义市场经济下的分配结构与激励体系

斯蒂格利茨认为 ,苏联东欧社会主义失败的原因具有微观经济的特征 ,即缺乏有效的经济激励 ,本文称之为“斯蒂格利茨命题”。这一命题对中国经济具有警示意义 ,即要提高经济运行的效率 ,必须在建立有效激励结构方面进行科学的制度安排 ,使激励制度作用于效率的提高。建立有效激励结构的关键是建立有效率的分配制度的体系。目前在分配制度上要解决的关键问题是 ,在坚持按劳分配制度的前提下正视按劳分配的效率区间 ,并通过建立和完善要素分配制度弥补按劳分配制度的非效率区间 ,同时注重相关经济主体的行动协调 ,使其行动围绕组织目标———劳动效率和资源配置效率的提高而运行。     

A comparative study on a permutation statistic

We studied asymptotic distribution and finite sample properties of a randomly weighted permutation statistic. The asymptotic normality and the finite sample simulations derived from our studies provided theoretical and numerical justifications for distributional assumption of many useful test statistics used in identifying spatial autocorrelations of mapped data. We compared a new method in computing the mean and the approximated variance of the randomly weighted D statistic, a special permutation statistic, with the Walter’s conditional method. In the numerical illustration of the method, we calculated the standardized values of the D statistic by subtracting the mean from the D statistic and dividing the difference by the standard deviation for the standardized mortality ratios (SMRs) and the life expectancies among the 48 states of the continental USA. Spatial autocorrelations of the SMRs and the life expectancies were found to be statistically significant.     

The Social Benefits of Expedited Risk Assessments

The present regulation of carcinogens is quite slow; hundreds of substances that have tested positive for carcinogenicity in animal bioassays have not been addressed by the U.S. regulatory system. This carries with it unappreciated social, economic, and public health costs. However, there are readily available expedited approximation procedures for assessing the potency of carcinogens whose use has substantial benefits that outweigh any costs from less science-intensive and less extensively documented assessments. These benefits can be seen by using a model to suggest the magnitude of social costs in regulating carcinogens by current conventional methods compared with expedited procedures for assessing the potency of known carcinogens. Two scenarios, one in accordance with current agency presumptions and one which assumes extreme unreliability in animal data and in the accuracy of potency assessments, compare conventional science-intensive and expedited procedures. On both, the total social costs of expedited procedures are lower than conventional procedures across a wide range of values assigned for individual mistakes of under regulation and over regulation. It appears better to evaluate a larger universe of known carcinogens somewhat less intensively for each substance than to evaluate a small proportion of that same universe very carefully and delay considering the rest.     

Sociology of “primitive societies,” evolutionism,and Africa

Sociology of primitive societies has revised its earlier views about kinship, lineage, or lineage mode of production. It attempts now to show that lineage did not pervade African precolonial societies and that other relations, such as capitalist and class relations, were also present. This article seeks to reestablish, contrary to the revisionist view, the centrality of lineage in African precolonial societies to allow for a paradigmatic shift that repudiates evolutionism and brings precolonial societies back to the center of the African debate. Because in such a reoriented debate Africa ceases to be marginalized and on the fringes of other historical experiences, the shift allows, paradoxically, the integration of scholarship on Africa into universal social theory.     

简论“我把你这个NP!”

汉语“我把你这个 NP”句式 ,有许多严格的限制条件 ,从句法、逻辑语义结构和语境、语用方面动态地立体地考察该句式 ,其基本语用功能是使用者在特定语境中通过评议表明态度 ,突出感情 ,示意处置