全文获取类型
收费全文 | 203篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 20篇 |
废物处理 | 1篇 |
环保管理 | 19篇 |
综合类 | 85篇 |
基础理论 | 13篇 |
污染及防治 | 12篇 |
评价与监测 | 29篇 |
社会与环境 | 5篇 |
灾害及防治 | 24篇 |
出版年
2022年 | 3篇 |
2021年 | 4篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 8篇 |
2014年 | 11篇 |
2013年 | 18篇 |
2012年 | 7篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2009年 | 21篇 |
2008年 | 16篇 |
2007年 | 10篇 |
2006年 | 2篇 |
2005年 | 7篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 7篇 |
1992年 | 9篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1987年 | 5篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有208条查询结果,搜索用时 140 毫秒
131.
Arzarello M Marcolini F Pavia G Pavia M Petronio C Petrucci M Rook L Sardella R 《Die Naturwissenschaften》2007,94(2):107-112
Some flint lithic artifacts were discovered in the fissure fillings of the well-known Pirro Nord site (Apulia, Southern Italy).
The lithic industry, composed by three cores and some flakes, has been found to be associated to an Early Pleistocene vertebrate
fossil assemblage. The fossil association contains a wide range of micromammals, including Allophaiomys ruffoi and Episoriculus gibberodon and large mammals including Bison degiulii and Equus altidens together with African elements as the gelada baboon Theropithecus and the saber-toothed cat Megantereon whitei. It defines the latest Villafranchian chronological unit (Pirro Nord Faunal Unit) in the Western European mammal biochronology.
The lithic industry of Pirro Nord represents the oldest occurrence of the genus Homo in Europe as it is attributable to a chronological interval between 1.3 and 1.7 Ma. This supports the hypothesis that the
genus Homo, with Oldowaian technology, extended its range in Europe, probably from western Asia, during the first half of the Early
Pleistocene. The new discovery from Pirro Nord changes the chronology of the first arrival of hominids in Europe and offers
new perspectives in the debate about the human dispersal in the Early Pleistocene. 相似文献
132.
133.
Lisa Leimar Price Astrid Björnsen Gurung 《Environment, Development and Sustainability》2006,8(4):507-517
The paper presents a methodology that guided several ethnoentomological research projects and goes on to examine and compare the results from two independent research locations in Asia. The first location is in the Philippines, a Green Revolution area that has been heavily impacted by extension messages and insecticide use. The second location is in Nepal which has a traditional subsistence orientation and has remained widely unaffected by agricultural modernization. The paper emphasizes the differences and similarities of the results from the two sites and discusses the role of the methodology and methods used in capturing ethnoentomological knowledge, particularly with regard to insect pests in rice. The results of both investigations share the importance of agronomic criteria among farmers in insect classification and sorting criteria, thus highlighting the relevance of functional criteria. Farmers at both research sites have difficulties in identifying the lifecycles of insects. We discuss the issues of tradition and change in farmer entomological knowledge and providing support to the knowledge base of farmers though programs like IPM-Farmer Field Schools as opposed to broad-based recommendations for crop pest management.Article type: MS-ENVI-SI ETHNOSCI MS04 Contribution to Environment, Development & Sustainability, special issue ‘Bridging the gap between natural resources and their human management for the future using ethnoscience’. 相似文献
134.
135.
Current “business as usual” projections suggest greenhouse gas emissions from industrialized nations will grow substantially
over the next decade. However, if it comes into force, the Kyoto Protocol will require industrialized nations to reduce emissions
to an average of 5% below 1990 levels in the 2008–2012 period. Taking early action to close this gap has a number of advantages.
It reduces the risks of passing thresholds that trigger climate change “surprises.” Early action also increases future generations'
ability to choose greater levels of climate protection, and it leads to faster reductions of other pollutants. From an economic
sense, early action is important because it allows shifts to less carbon-intensive technologies during the course of normal
capital stock turnover. Moreover, many options for emission reduction have negative costs, and thus are economically worthwhile,
because of paybacks in energy costs, healthcare costs, and other benefits. Finally, early emission reductions enhance the
probability of successful ratification and lower the risk of noncompliance with the protocol. We discuss policy approaches
for the period prior to 2008. Disadvantages of the current proposals for Credit for Early Action are the possibility of adverse
selection due to problematic baseline calculation methods as well as the distributionary impacts of allocating a part of the
emissions budget already before 2008. One simple policy without drawbacks is the so-called baseline protection, which removes
the disincentive to early action due to the expectation that businesses may, in the future, receive emission rights in proportion
to past emissions. It is particularly important to adopt policies that shift investment in long-lived capital stock towards
less carbon-intensive technologies and to encourage innovation and technology development that will reduce future compliance
costs. 相似文献
136.
This paper examines the ways residents in the Grampians area in the Australian state of Victoria used their local and their state and national based media before, during and after the 2006 bushfires (wildfires). The researchers were particularly concerned to understand how residents evaluated media sources as trustworthy and credible in relation to bushfire warnings and information about the fires delivered in the media.Analysis of data derived from two separate focus group sessions conducted by the researchers reveals four main themes. (1) The media are perceived as part of a broader information gathering process. (2) Local knowledge is the most important aspect in broadcast information. (3) Members of small communities can feel disenfranchised and resentful of the media when media coverage focuses on larger towns, and (4) the effects of media reporting, including specific warnings, are both immediate and long lasting.The paper explores some of the tensions that result from the ways rural residents use and distinguish between local/regional and metropolitan and out-of-state bushfire information; and it encourages better use of the local/regional media to increase community safety and awareness in relation to bushfire mitigation, preparedness and crisis management issues before, during and after the fires. It is suggested that risk communications professionals need to understand that when mediated risk-related communications are provided, a key evaluative criterion is whether or not those media and the messages represent and reflect local knowledge. 相似文献
137.
The flood defence agency in England and Wales has been pursuing a programme of flood warning system enhancement, engaging householders at risk in improving their warning responses. The immediate aim of this paper is to test and revise a model of economic benefits of warnings, but the survey data also generate insights into the constraints acting upon flood warning responses. Damage saving is less than previously anticipated: warning reliability and householder availability problems limit savings. Warnings are less likely to be received by those in lower social grades, and flood warning lead time is a factor in avoiding damage. The survey data indicate the complexities involved in improving flood warning response, and provide policy pointers. 相似文献
138.
Simon McCarthy Sylvia Tunstall Dennis Parker Hazel Faulkner Joe Howe 《Environmental Hazards》2007,7(3):179-192
Risk communication in flood incident management can be improved through developing hydrometeorological and engineering models used as tools for communicating risk between scientists and emergency management professionals. A range of such models and tools was evaluated by participating flood emergency managers during a 4-day, real-time simulation of an extreme event in the Thamesmead area in the Thames estuary close to London, England. Emergency managers have different communication needs and value new tools differently, but the indications are that a range of new tools could be beneficial in flood incident management. Provided they are communicated large model uncertainties are not necessarily unwelcome among flood emergency managers. Even so they are cautious about sharing the ownership of weather and flood modelling uncertainties. 相似文献
139.
青海省牧区雪灾预警模型研究 总被引:4,自引:0,他引:4
对青海省牧区各气象站的积雪深度、积雪日数等气象资料进行了统计分析,结合青海省牧区积雪状况和草场特点,建立了雪灾预警模型。 相似文献
140.