天峻县地质灾害类型、分布特征及防治措施

通过对天峻县地质灾害的详细调查,分析研究出地质灾害在空间分布、时间、地形地貌上的分布特征,提出针对性强,易操作的预防及治理的各项具体措施。     

公共聚集场所火灾隐患及预防对策

近几年来公共聚集场所建筑日益增多,其建筑规模、装修规模、容纳人员数量的迅速发展,使得火灾危险性大大增加,暴露出的火灾隐患愈加凸现,全国在公共聚集场所发生火灾的次数在总的火灾次数中所占的比例明显增大,造成的损失也越来越严重。     

二氧化硫的职业危害及四氯汞钾-盐酸副玫瑰苯胺分光光度法的探讨

文章阐述二氧化硫的职业危害性,并对采用四氯汞钾-盐酸副玫瑰苯胺分光光度法在实际实验过程出现的问题进行探讨。     

构建“强县扩权”改革的制度基础——基于对潜在隐患的规避

"强县扩权"改革是我国社会经济发展和现阶段国家宏观政策推动下提高政府行政效率的一种大胆尝试,但基于我国目前的社会资本存量和政府权力运行现状,我们不能不担虑"强县扩权"改革可能产生潜在隐患.只有通过选任制度改革、绩效管理、目标管理等方面着手强化信息对称和共识建设,同时改善舆论环境、加强群众监督,才能为"强县扩权"改革奠定权力良性运行的基础.     

Re-conceptualizing community in risk research

Community is an important concept for determining the factors that influence peoples’ perceptions of and actions surrounding risk. However, there are multiple and conflicting definitions for the concept of community and scholars operationalize it in various ways. In this paper, we argue for a renewed focus on community as a guiding consideration in discussions of risk management and the related concepts of resilience, vulnerability, and adaptive capacity. We outline classic and current conceptions of community to articulate how its conceptualization in ongoing risk research might lead to different outcomes, foci, or recommendations about collective adaptation. This includes a discussion of how historic and emerging methodological approaches for studying risk make implicit choices about what community is or how it influences collective response. We close by providing a set of potential axioms that can help researchers better integrate the complexity of community into studies of risk and understand how populations respond to it. Better integrating community into studies of risk could promote policies and communication that are tailored to the unique local context of diverse populations. Such tailoring is more likely to promote adoption of risk mitigations among local populations and perpetuate adaptation as a part of local culture. We contend that a more holistic and systematic approach to documenting local context better encompasses the variable influences that community can have on collective ability to respond to risks.     

A Non-Proportional Hazards Model with Hazard Ratio Functions Free from Covariate Values

A brief survey on methods to handle non-proportional hazards in survival analysis is given with emphasis on short-term and long-term hazard ratio modelling. A drawback of the existing model of this nature is that except at time zero or infinity, the hazard ratio for a unit increase in the value of a covariate depends on the starting value. With two or more covariates, the hazard ratio for a unit increase in one covariate with other covariates held fixed depends in an unintended way on the values of the other covariates. We propose an alternative way to model short-term and long-term hazard ratios without the above drawbacks through a judicious choice of covariate-time interactions. Under the new model, it is easier to describe the time-varying effect of each covariate on the hazard. Nonparametric maximum likelihood estimation for the new model can be carried out in the same way as for the existing model. We also propose a product version of the existing model, which overcomes its second drawback but not the first. The advocated covariate–time interaction model provides a better fit to the Veterans Administration lung cancer data set than the original and product versions of the existing model.     

The extent and magnitude of formalin adulteration in fish sold in domestic markets of Bangladesh: a literature review

Bangladesh has been suffering from rampant food adulteration for the last few decades. Dishonest businessmen use formalin illegally as preservative to prevent spoilage and increase shelf‐life of fish. Prolonged consumption of formalin adulterated fish may cause serious health hazards (i.e. cancers) which lead to increased morbidity and mortality. The aim of the review was to examine the extent and magnitude of illegal formalin treatment in fish sold in domestic markets of Bangladesh. A systematic review was conducted using conventional databases and non‐conventional approaches to identify the relevant studies. Out of nine studies, eight confirmed the presence of formalin in fish collected from the markets of four main cities. Large and imported fishes were found to be mainly affected. Formalin adulterated fish was reported in seven studies. The fish were tested using a locally developed kit, and the amount of formalin treated fish ranged between 0.5 and 50%. Two other studies used the spectrophotometric method and reported specific formalin levels. The study conducted in Dhaka found mean levels of formalin to be 402.35 mg/kg in imported fishes and 118.60 mg/kg in local fishes which were much higher than the WHO recommended levels. In another study conducted in Mymensingh, formalin levels ranged between 1.4 and 7.3 mg/kg in both marketed and freshly caught pond fishes. The use of accurate, simple, specific and sensitive techniques is therefore highly recommended. The government and other agencies should address the issue as a priority basis by formulating effective policies and programs to safeguard the health of the public.     

Linear rank tests for comparing treatments with a control when data are subject to unequal patterns of censorship

A class of asymptotically distribution-free tests is considered for comparing several treatments with a control when the, data are subject to unequal right-censorship. A particular member of this class is proposed for use in practice and an illustrative numerical example is given. A general result for the Pitman efficacy of a test based on an asymptotically normal test statistic is proved for the multiparameter case and using this result the efficacy of the proposed class of tests is obtained under sequences of translation and proportional hazards alternatives. Simulation studies are conducted to compare the performance of the proposed test, in terms of power, with some other tests.     

Surviving Chapter 11 Bankruptcies: Duration and Payoff?

Three of the authors previously developed a model to predict the duration of Chapter 11 bankruptcy and the payoff to shareholders ( Partington et al ., 2001 ). This work augments that study using a much larger sample to re-estimate the model and assess its stability. It also provides an opportunity for out-of-sample testing of predictive accuracy. The resulting models are based on Cox's proportional hazards model and the current article points to the need to test two important assumptions underlying the model. First, that the hazards are proportional and, second, that censoring is independent of the event studied. Using the extended data set, all the previously significant accounting variables drop out of the model and only two covariates of the original model remain significant. These are the market wide credit spread and the market capitalization of the firm, both measured immediately prior to the firm's entry to Chapter 11. Receiver operating characteristic curves are then used to assess the predictive accuracy of the original and extended models. The results show that Lachenbruch tests can provide a misleading indication of predictive ability out of sample. Using the Lachenbruch method of in-sample testing, both models show predictive power, but in a true out-of-sample test they fail dismally. The lessons of this work are relevant to better predicting the gains and losses likely to accrue to shareholders of companies in Chapter 11 bankruptcy and in similar administrative arrangements in other jurisdictions.     

金融发展影响了公司成熟度与现金股利政策的关系吗?

选取留存收益股权比反映公司成熟度,研究不同金融发展水平下,公司成熟度与现金股利的关系,实证结果显示,伴随公司成熟度的提高,公司实施积极现金股利政策的动机会显著提升;金融发展在提高公司成熟度与现金股利支付倾向正向关系的同时,由于提供更多的投资机会,却弱化了公司成熟度与现金股利支付水平的正向关系。进一步研究发现,金融发展水平的提升能够推迟成熟公司首次对外支付现金股利的时机;其对公司成熟度与现金股利政策关系的影响作用主要源于金融发展的"治理效应"路径;将金融发展分为信贷市场发展和股权市场发展,发现与信贷市场促进公司成熟度与现金股利支付倾向正相关关系不同,股权市场抑制了公司成熟度与现金股利支付倾向及支付水平的正相关关系。