Visualization of the Malleability of the Rubber Core of Rubber Particles from Parthenium argentatum Gray and Other Rubber-Producing Species Under Extremely Cold Temperatures

Rubber particles from Parthenium argentatum Gray (guayule) were frozen in liquid nitrogen (–196°C), fractured, and visualized using cryo-scanning electron microscopy. We observed that the rubber polymer core of the rubber particles was still malleable at this extremely cold temperature, and the core stretched substantially during separation of the fracture planes. This malleability was observed in situ in tissue sections, as well as in purified rubber particles, and was found to be independent of purification procedure, guayule line, tissue age, or season. The malleability or stretching phenomenon suggests that P. argentatum rubber has some unique properties because rubber particles from Hevea brasiliensis Müll. Arg. and Ficus elastica Roxb. were brittle at this temperature, fractured cleanly, or showed only tiny threads of material pulling out of the core.     

"十五"期间黑龙江省自然灾害的特点及减灾对策

分析了黑龙江省"十五"期间自然灾害的发展趋势及其3种不同类型地区灾害的特点,提出减灾工作的重点是防御洪涝、干旱、低温冷害等8大灾种。根据40多年来黑龙江省减灾工作的主要经验,对每种灾害提出了切实可行的防御对策。     

陕西省自然灾害综合预报回顾与展望

对陕西省自1990年以来开展的自然灾害综合预报及其服务情况,作了全面的分析总结,发现综合预测的准确率达73%以上,各单项自然灾害的预测准确率也都较高。文章并对如何进一步做好自然灾害综合预测提出了设想。     

关于灾害、灾害学和灾害研究方法若干问题的浅见

对灾害、灾害学和灾害研究方法等问题做了简短的讨论,提出了一些个人的看法。笔者认为,灾害可以分为两大类,即自然灾害与人为灾害。对两类灾害的可能的研究方法做了概述和评论。     

防洪减灾观念的理论进展--灾害双重属性概念及其科学哲学基础

提出灾害的双重属性概念,是国际减灾十年活动中的重要理论进展之一,已被国家防洪减灾主管部门所采纳,被认为是防洪减灾方针转变的理论基础.作者总结了多年来的研究心得,论述了灾害双重属性概念的实质,以及它和工程与非工程相结合的减灾措施之异同.论述了这个科学概念系来源于我国传统治水理念和西方现代防洪减灾思想,并阐述了这一概念的科学和哲学基础.     

中国自然灾害应急管理研究进展与对策

从中国自然灾害应急管理的现状出发,系统分析了自然灾害应急管理领域的研究进展,指出了中国自然灾害应急管理在理论和实践方面存在的问题.在此基础上,提出了中国自然灾害应急管理框架,认为建立适合中国国情的自然灾害应急管理体制是提高中国自然灾害应急管理的基础;应急预案的制定和实施是规范灾害应急管理,提高灾害紧急救援能力的关键措施;灾害信息快速准确的获取和评估是灾害应急管理的有效保障;建立实际可用的应急管理系统是提高灾害应急管理水平和工作效率的根本出路.     

浅谈伊犁地区山地天然林资源的保护和发展

伊犁地区林牧区生态系统的保水功能受到畜牧业生产活动的影响已明显下降,尤其是山地天然林资源的生态总体质量和生态功能都同步处于下降趋势。伊犁地区的生态建设重点应放在山地天然林分布区。保护和大力发展山地天然林资源是伊犁地区生态产业发展的核心内容。大力营造山地人工林,是目前条件下保护和发展山地森林资源的最有效手段。每年营造山地人工林不少于0 3×104hm2,才能够基本保持山地森林生态系统在资源总量和生态效能上的稳定,才能够基本维持伊犁地区以往良好的生态形象。建议自治区人民政府继续启动实施天山、阿尔泰山百万亩山林再造工程。     

Natural Behavior, Animal Rights, or Making Money – A Study of Swedish Organic Farmers' View of Animal Issues

A questionnaire study was performed among Swedish organic livestock farmers to determine their view of animal welfare and other ethical issues in animal production. The questionnaire was sent to 56.5% of the target group and the response rate was 75.6%. A principal components analysis (exploratory factor analysis) was performed to get a more manageable data set. A matrix of intercorrelations between all pairs of factors was computed. The factors were then entered into a series of multiple regression models to explain five dependent variables. Respondents were well educated and had long experience of farming. 81% were full-time farmers. They generally had a very positive attitude towards organic animal husbandry. They considered allowing animals their natural behavior a central aim, which is in accordance with organic philosophy. Farmers tended to be less approving of concepts like animal rights, dignity, and intrinsic value. When analyzing correlations between the factors, two groups of farmers emerged that were only partially correlated, representing different attitudes and behavioral dispositions. These may be interpreted as two subpopulations of organic livestock farmers in Sweden: those who saw organic farming as a lifestyle (``pioneer attitude') and entrepreneurs, who considered making money and new challenges more important. Their view of animal welfare differed. While the pioneers considered natural behavior a key issue, this was less important to the entrepreneurs, who also had a more approving attitude towards invasive operations such as castration and were more critical of the organic standards.     

Implementing Sustainability: the Use of Natural Channel Design and Artificial Wetlands for Stormwater Management

Sustainability is a concept that has been widely embraced both politically and intellectually but has not been addressed in terms of practical application. In most resource sectors, the features of a sustainable future remain unclear and there are few examples that give practical expression to sustainability. This is especially true in the case of water resources management which has been conspicuous in its absence from the majority of the literature. This paper attempts to address this deficiency on two counts. First, it provides a discussion of sustainability and the application of the concept to the management of water resources. Second, the paper illustrates how the concept can be utilized for the management and planning of urban stormwater. The paper concludes by offering research opportunities to investigate the feasibility of adopting natural channel design and artificial wetlands for sustainable stormwater management.     

福建省自然灾害特点及背景分析

本文根据福建省历史上自然灾害事例概括出洪涝、干旱、地震、水土流失、冰雹、寒害等自然灾害特点。并从地理位置、环流因素、地形、地质构造、人为因素等方面分析了福建自然灾害形成的背景原因。最后针对福建省自然灾害特点提出了减灾建议。