内布拉斯加州第四记冰碛年龄

<正> 北美第四纪沉积物曾有过一段漫长而有趣的历史。内布拉斯加州的第四纪沉积物是很重要的,因为许多经济活动都依赖于这些堆积物上发育的土壤和从沉积物中汲出的水,建筑材料也采自这些沉积物。从某种意义上说,几乎所有从事陆地上工作的人都是第四纪研究者,农民注意各种土类的差异和散布于内布拉斯加东部冰川作用区周围的奇特“外来石”景观,打井工人都熟悉这些沉积地层和埋藏在古河道中呈“脉状”     

指导环保事业发展的纲领性文件

在"十一五"即将起步之时,在全面建设小康社会的关键时期,国务院发布了<关于落实科学发展观加强环境保护的决定>(以下简称<决定>),这是深入贯彻十六届五中全会精神,落实科学发展观,构建社会主义和谐社会,指导我国经济、社会与环境协调发展的一份纲领性文件.深入学习贯彻<决定>,对于广泛调动全社会力量,加快推进环保事业发展,实现全面建设小康社会的宏伟目标将产生巨大的推动作用.     

联合起来共创更加舒适的职安条件

现在全球的职业种类正在改变,这些改变在职业安全健康(劳动保护)方面给我们提出了新的挑战。这些挑战要求我们找出新的解决方法,这一切都是因为全球经济一体化发展促使我们拥有共同的利益和需求。我们的解决方案必须充分考虑差别甚     

Science in the public process of ecosystem management: lessons from Hawaii, Southeast Asia, Africa and the US Mainland

Partnerships and co-operative environmental management are increasing worldwide as is the call for scientific input in the public process of ecosystem management. In Hawaii, private landowners, non-governmental organizations, and state and federal agencies have formed watershed partnerships to conserve and better manage upland forested watersheds. In this paper, findings of an international workshop convened in Hawaii to explore the strengths of approaches used to assess stakeholder values of environmental resources and foster consensus in the public process of ecosystem management are presented. Authors draw upon field experience in projects throughout Hawaii, Southeast Asia, Africa and the US mainland to derive a set of lessons learned that can be applied to Hawaiian and other watershed partnerships in an effort to promote consensus and sustainable ecosystem management. Interdisciplinary science-based models can serve as effective tools to identify areas of potential consensus in the process of ecosystem management. Effective integration of scientific input in co-operative ecosystem management depends on the role of science, the stakeholders and decision-makers involved, and the common language utilized to compare tradeoffs. Trust is essential to consensus building and the integration of scientific input must be transparent and inclusive of public feedback. Consideration of all relevant stakeholders and the actual benefits and costs of management activities to each stakeholder is essential. Perceptions and intuitive responses of people can be as influential as analytical processes in decision-making and must be addressed. Deliberative, dynamic and iterative decision-making processes all influence the level of stakeholder achievement of consensus. In Hawaii, application of lessons learned can promote more informed and democratic decision processes, quality scientific analysis that is relevant, and legitimacy and public acceptance of ecosystem management.     

Distribution of fission products in dust samples from the region of Thessaloniki, Greece, after the Chernobyl nuclear accident

The distribution of the fission products (95)Zr, (95)Nb, (103)Ru, (106)Ru (determined through (106)Rh), (125)Sb, (129m)Te, (134)Cs, (137)Cs, (140)Ba, (140)La, (141)Ce and (144)Ce has been determined in dust samples from the region of Thessaloniki, Greece, after the nuclear accident at Chernobyl. The samples studied also included (110m)Ag, not belonging to the products of (235)U fission. Samples showing higher concentrations of radionuclides also show a higher content in clay minerals, whereas samples having low concentrations of radionuclides usually contain large amounts of quartz and feldspars. Desorption and leaching experiments using solutions of chlorides of sodium, potassium, calcium and magnesium (0.5 N), as well as distilled and tap water, were also performed. Sodium and potassium chloride solutions were found to be efficient in desorbing and/or leaching of caesium and ruthenium isotopes to an extent of about 30%.