洞庭湖湿地自然保护区规划的基本问题

湿地自然保护区具有生产、承受、信息、调节等多种生态功能 ,科学规划和建设湿地自然保护区 ,对于合理利用自然资源 ,保持良好的生态环境 ,具有重要意义。岛屿生物地理学和景观生态学理论对于湿地自然保护区规划 ,包括保护区网设计、保护区规模的确定等都有重要的指导意义。     

Professional discourse in winning images: objectivity and professional boundaries in environmental news images in the World Press Photo contest, 1992–2011

This article applies the ecological theory of professions to analyze professional discourse in the World Press Photo (WPP) contest, an international photojournalism contest held in Amsterdam, the Netherlands. The article analyzes the content of 148 photojournalism works that received environmental awards in the period 1992 to 2011, the two decades after the 1992 Earth Summit in Rio de Janeiro. The article seeks to understand the representation and negotiation of objectivity and the claims of professional boundaries by the media of both developed and developing countries as well as non-governmental organizations (NGOs). It also seeks to interpret the professional discourse of the WPP in relation to ideologies and power dynamics in both journalism and global environmental politics. The results suggested that the media of developed countries dominated the discourse, and the conventional notion of journalistic objectivity remained intact. However, the results also showed that global environmental politics and the situation of journalism created openings for the media of developing countries and NGOs to enlarge jurisdictional claims in the area of natural disaster reporting and to challenge the conventional notion of objectivity. The results also showed that the conventional notion of objectivity did not necessarily hinder explanations of the complexity of environmental issues, which was made possible by choosing unique angles of storytelling, planning multiple shots, and using richly suggestive, naturalistic images.     

论生态意识、资源忧患与生态经济观

本文从生态环境及其危机意识入手,论证了生态经济观认知逻辑的起点,阐述了资源忧患的经济本质及其为生态经济观赋予的科学使命。文章指出,生态经济观的形成有望摆脱传统经济观念的窠臼,从而构建出谋求生态、经济、社会的全面均衡、持续发展的理念。     

马克思辩证法次生态衍义之应然意蕴与可然诠释

近年来，在对马克思辩证法做“原生态”解读与超越的衍义进程中，出现了某种程度上的偏离马克思辩证法本真精神的倾向。笔者对马克思辩证法衍义的“应然”与“可然”意蕴作了尝试性的阐释，旨在还原马克思辩证法的本来面目。     

A comparison of classification models to identify the Fragile X Syndrome

The main models of machine learning are briefly reviewed and considered for building a classifier to identify the Fragile X Syndrome (FXS). We have analyzed 172 patients potentially affected by FXS in Andalusia (Spain) and, by means of a DNA test, each member of the data set is known to belong to one of two classes: affected, not affected. The whole predictor set, formed by 40 variables, and a reduced set with only nine predictors significantly associated with the response are considered. Four alternative base classification models have been investigated: logistic regression, classification trees, multilayer perceptron and support vector machines. For both predictor sets, the best accuracy, considering both the mean and the standard deviation of the test error rate, is achieved by the support vector machines, confirming the increasing importance of this learning algorithm. Three ensemble methods - bagging, random forests and boosting - were also considered, amongst which the bagged versions of support vector machines stand out, especially when they are constructed with the reduced set of predictor variables. The analysis of the sensitivity, the specificity and the area under the ROC curve agrees with the main conclusions extracted from the accuracy results. All of these models can be fitted by free R programs.     

社会生态视角下未成年人网络痴迷的成因

随着网络的普及,未成年人网络痴迷已成为一个不容忽视的社会问题。本文从社会生态理论的视角,结合社会调查的数据分析,将影响未成年人痴迷于网络的原因分为微观、中观和宏观三个方面加以分析,为未成年人网络痴迷问题的研究提供一个新的视角和理论依据。     

Case study for evaluating campus sustainability: nitrogen balance for the University of Minnesota

American ecologists recently began to address the ecology of cities. Concurrently, higher education institutions have developed sustainability education programs and instituted sustainability policies and projects. This paper draws together these two disparate areas by examining the nitrogen (N) budget of the Twin Cities campus of the University of Minnesota. We addressed the question: what were the annual inputs, outputs and internal cycles of N on the University of Minnesota Twin Cities campus? We found that 508 Mg N yr-1 were brought into the campus and 494 Mg N yr-1 were emitted from the University of Minnesota campus. The largest N inputs were abiotic fixation (conversion of N₂ to NO_x by combustion) and food for humans and animals. The largest N output was NO_x, followed by wastewater. Our results expand the understanding of the ecology of institutions within an urban area and provide an opportunity for improving urban ecology education and environmental policy at educational institutions.     

关于我国林产品安全问题的思考

产品安全问题是我国经济领域的热点问题。本文讨论了林产品安全的概念与内涵，认为林产品安全既包括质量安全又包括生态安全。在此基础上，文章论述了当前我国林产品质量安全与生态安全的现状及发展动向。最后，文章得出了我国林产品总体上尚处于不安全状态的初步结论。     

American Indian Perceptions of Paternal Responsibility

Using data from the Fragile Families and Child Wellbeing Study, this study examined the issue of American Indian nonresident father rights and obligations. Findings revealed that both American Indian mothers and fathers supported visitation rights, but decision-making rights were not highly supported unless the father was paying child support. Both American Indian parents were similar in their views regarding paternal responsibilities. Therefore, while general father involvement intervention strategies may work for American Indians, it is important for practitioners to explore how American Indians define paternal involvement and to what extent they are willing to allow the nonresident father to participate in all aspects of the child's life.     

对可持续发展的伦理思考

可持续发展是人类为了克服一系列环境、经济和社会问题 ,特别是全球性的环境污染和广泛的生态破坏 ,以及它们之间关系失衡所作出的理性抉择。可持续发展包括生态、经济和社会三方面的发展 ,本文试从这三方面对可持续发展作一探讨 ,从而在伦理上给人们树立一种新的价值导向