生态学马克思主义对西方环境主义的批判和启示

西方环境主义认为人类在地球上的频繁活动将导致地球整个生态系统的破坏，要想解决环境问题就必须限制人类活动，缩小经济发展规模，避免人口过剩；而生态学马克思主义则指出，生态危机产生的根源是由于资本主义私有制的存在，环境污染和人口过剩是资本主义剥削自然和剥削人类的结果，只有建立生态社会主义社会，绿色环境主义者和马克思主义者的可持续发展理想才能实现。     

Analysis of Regional Scale Risk of Whirling Disease in Populations of Colorado and Rio Grande Cutthroat Trout Using a Bayesian Belief Network Model

Introduction and spread of the parasite Myxobolus cerebralis, the causative agent of whirling disease, has contributed to the collapse of wild trout populations throughout the intermountain west. Of concern is the risk the disease may have on conservation and recovery of native cutthroat trout. We employed a Bayesian belief network to assess probability of whirling disease in Colorado River and Rio Grande cutthroat trout (Oncorhynchus clarkii pleuriticus and Oncorhynchus clarkii virginalis, respectively) within their current ranges in the southwest United States. Available habitat (as defined by gradient and elevation) for intermediate oligochaete worm host, Tubifex tubifex, exerted the greatest influence on the likelihood of infection, yet prevalence of stream barriers also affected the risk outcome. Management areas that had the highest likelihood of infected Colorado River cutthroat trout were in the eastern portion of their range, although the probability of infection was highest for populations in the southern, San Juan subbasin. Rio Grande cutthroat trout had a relatively low likelihood of infection, with populations in the southernmost Pecos management area predicted to be at greatest risk. The Bayesian risk assessment model predicted the likelihood of whirling disease infection from its principal transmission vector, fish movement, and suggested that barriers may be effective in reducing risk of exposure to native trout populations. Data gaps, especially with regard to location of spawning, highlighted the importance in developing monitoring plans that support future risk assessments and adaptive management for subspecies of cutthroat trout.     

Asymptotic approximations to the distribution of Kendall's sample τ

This paper provides a saddlepoint approximation to the distribution of the sample version of Kendall's τ, which is a measure of association between two samples. The saddlepoint approximation is compared with the Edgeworth and the normal approximations, and with the bootstrap resampling distribution. A numerical study shows that with small sample sizes the saddlepoint approximation outperforms both the normal and the Edgeworth approximations. This paper gives also an analytical comparison between approximated and exact cumulants of the sample Kendall's τ when the two samples are independent.     

基于循环经济理论的产业集群生态化发展评价研究

引入循环经济理念,建立科学评价产业集群生态化发展的体系和方法,对引导产业集群合理有序的发展具有十分重要的意义。从经济效益、环境效益和社会绩效三个方面着手,构建符合循环经济特征的产业集群生态化发展评价指标体系,计算出各指标的评价值及其在评价体系中的权重以后,采用线性加权求和法求得产业集群生态化发展的综合评分值,既可对产业集群某一时期生态化发展水平及三个维度间的关系作出客观的评价,找到存在的问题和差距。     

Discovering hidden statistical issues through individual-level models in ecological studies

ABSTRACT

In ecological studies, individual inference is made based on results from ecological models. Interpretation of the results requires caution since ecological analysis on group level may not hold in the individual level within the groups, leading to ecological fallacy. Using an ecological regression example for analyzing voting behaviors, we highlight that the explicit use of individual-level models is crucial in understanding the results of ecological studies. In particular, we clarify three relevant statistical issues for each individual-level models: assessment of the uncertainty of parameter estimates obtained from a wrong model, the use of shrinkage estimation method for simultaneous estimation of many parameters, and the necessity of sensitivity analysis rather than adhering to one seemingly most compelling assumption.     

地铁对城市现代化的影响

地铁是城市发展现代化的一个重要标志。本文分析了国内外城市地铁的构建、运营以及地铁在城市化进程中的作用，进而系统阐释了地铁对广州城市发展、社会生活及生态环境的影响和意义。     

基于社区视角下的农村环境管理探讨

市场机制对农村环境管理具有灵活性、低成本性,但是由于环境问题的外部性,市场失灵容易发生.运用政府管制手段可以加强环境管理的公平性,但是由于环境治理的政府主导型特征,政府失灵容易发生.社区作为介于政府与市场之间的第三部门,可以运用其独特的社会资本参与环境管理,以其自身所具有的灵活性、低成本性、信息优势和高效性,克服市场失灵和政府失灵现象.     

社会主义生态文明建设的重要内容: 生态消费模式

当前，我国消费伴随着经济的快速发展日益被异化为“病态式消费”模式，这使得国民经济的协调发展遭到了严重破坏，甚至生态系统也面临着崩溃的危险。我国新富群体缺乏正确的消费观念，加上西方消费主义影响，引发了诸多的社会问题。实践证明，只有树立正确的消费观念、克制消费欲望、调整消费行为，才能建立生态消费模式，才能符合社会主义生态文明的要求，实现人与自然的协调发展。     

江苏省宿迁市耕地生态足迹初探

运用生态足迹模型和相关统计年鉴数据，计算了宿迁市2006年的耕地生态足迹。结果表明：2006年宿迁市耕地生态足迹为0.73332hm2/人，而耕地生态承载力为0.38504hm2/人，生态赤字为0.34828hm2/人，这说明宿迁市的耕地利用已经超出了生态承载力的范围，处于不可持续发展的状态。     

Improved likelihood inferences for Weibull regression model

A general procedure is developed for bias-correcting the maximum likelihood estimators (MLEs) of the parameters of Weibull regression model with either complete or right-censored data. Following the bias correction, variance corrections and hence improved t-ratios for model parameters are presented. Potentially improved t-ratios for other reliability-related quantities are also discussed. Simulation results show that the proposed method is effective in correcting the bias of the MLEs, and the resulted t-ratios generally improve over the regular t-ratios.