全文获取类型
收费全文 | 22776篇 |
免费 | 152篇 |
国内免费 | 115篇 |
专业分类
安全科学 | 374篇 |
废物处理 | 1112篇 |
环保管理 | 3234篇 |
综合类 | 4192篇 |
基础理论 | 6158篇 |
环境理论 | 7篇 |
污染及防治 | 5060篇 |
评价与监测 | 1584篇 |
社会与环境 | 1255篇 |
灾害及防治 | 67篇 |
出版年
2018年 | 1576篇 |
2017年 | 1477篇 |
2016年 | 1362篇 |
2015年 | 285篇 |
2014年 | 218篇 |
2013年 | 985篇 |
2012年 | 764篇 |
2011年 | 1733篇 |
2010年 | 991篇 |
2009年 | 978篇 |
2008年 | 1298篇 |
2007年 | 1674篇 |
2006年 | 460篇 |
2005年 | 358篇 |
2004年 | 394篇 |
2003年 | 456篇 |
2002年 | 433篇 |
2001年 | 487篇 |
2000年 | 343篇 |
1999年 | 222篇 |
1998年 | 168篇 |
1997年 | 155篇 |
1996年 | 183篇 |
1995年 | 181篇 |
1994年 | 213篇 |
1993年 | 185篇 |
1992年 | 187篇 |
1991年 | 185篇 |
1990年 | 216篇 |
1989年 | 198篇 |
1988年 | 170篇 |
1987年 | 165篇 |
1986年 | 150篇 |
1985年 | 168篇 |
1984年 | 164篇 |
1983年 | 169篇 |
1982年 | 164篇 |
1981年 | 163篇 |
1980年 | 149篇 |
1979年 | 150篇 |
1978年 | 147篇 |
1977年 | 133篇 |
1976年 | 136篇 |
1975年 | 114篇 |
1974年 | 142篇 |
1973年 | 126篇 |
1972年 | 125篇 |
1971年 | 105篇 |
1970年 | 106篇 |
1967年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
Kumar Shalender Rajesh Kumar Yadav 《Environment, Development and Sustainability》2018,20(6):2587-2607
The purpose of the research is to identify the critical challenges that are impeding the adoption of e-mobility in India. It also aims to give a roadmap how to address these challenges while taking into considerations concerns of all the relevant stakeholders. Based on an in-depth literature review, an exploratory research design is employed to delve deep into various aspects of e-mobility. This is followed by a three-phase Delphi technique to identify and rate the e-mobility challenges in the Indian context. The study successfully identifies four different categories of challenges and proposes integrative framework for e-mobility. Further, the research goes on to lay out the future roadmap for mass adoption of electric vehicles (EVs) in India. The research is novel in terms of presenting a holistic viewpoint on e-mobility in India. Its originality lies in identifying the major inhibitors obstructing EVs adoption in India and then suggesting the roadmap how to overcome these impediments for mass adoption of e-mobility. 相似文献
3.
4.
5.
Frank Eierdanz Joseph Alcamo Lilibeth Acosta-Michlik Dörthe Krömker Dennis Tänzler 《Regional Environmental Change》2008,8(4):197-205
This paper presents the technical aspects of a new methodology for assessing the susceptibility of society to drought. The
methodology consists of a combination of inference modelling and fuzzy logic applications. Four steps are followed: (1) model
input variables are selected—these variables reflect the main factors influencing susceptibility in a social group, population
or region, (2) fuzzification—the uncertainties of the input variables are made explicit by representing them as ‘fuzzy membership
functions’, (3) inference modelling—the input variables are used to construct a model made up of linguistic rules, and (4)
defuzzification—results from the model in linguistic form are translated into numerical form, also through the use of fuzzy
membership functions. The disadvantages and advantages of this methodology became apparent when it was applied to the assessment
of susceptibility from three disciplinary perspectives: Disadvantages include the difficulty in validating results and the
subjectivity involved with specifying fuzzy membership functions and the rules of the inference model. Advantages of the methodology
are its transparency, because all model assumptions have to be made explicit in the form of inference rules; its flexibility,
in that informal and expert knowledge can be incorporated through ‘fuzzy membership functions’ and through the rules in the
inference model; and its versatility, since numerical data can be converted to linguistic statements and vice versa through
the procedures of ‘fuzzification’ and ‘defuzzification’. 相似文献
6.
Tanay B. Yıldırım Tutku Ak Zuhal Ölmez 《Environment, Development and Sustainability》2008,10(6):871-881
While the world is going into different tourism expectations, the tourism understanding in Turkey is defined as tourism in the sea-sand-sun triangle. However, it is possible to contribute to the income and local development of the indigenous people by developing nature-based tourism. Besides, with the sustainable use and preservation of the natural-cultural assets, the damage of the traditional tourism industry on the natural and cultural environment could be reduced. In this study, it is aimed to bring up the nature-based tourism concept in Çanakkale by evaluating the nature-based tourism industry in the general of Turkey and assessing the natural-cultural resources that Çanakkale comprehends. The most important areas that have a nature-based tourism potential in Çanakkale and the tourism activities that are most suitable for these areas have been determined. 相似文献
7.
8.
E.W. Lees 《Natural resources forum》1993,17(4):288-293
Energy efficiency is often stated to be the most cost-effective measure for satisfying our energy demand with minimal environmental damage. However, the potential energy savings attainable in 'the real world' are frequently overestimated, as is shown in an industrial case study of the glass industry. Nevertheless, there are significant energy savings to be realized, and the role of new technologies in this is important. However, the key to the effective use of new technology for improved energy efficiency is good management and. for best effect, it must be integrated into the normal resource management activities of a company. 相似文献
9.
Critics of the Endangered Species Act have asserted that is protects an inordinate number of subspecies and populations, in addition to full species, and that the scientific rationale for listing decisions is absent or weak. We reviewed all U.S. plants and animals proposed for listing or added to the endangered species list from 1985 through 1991 to determine the relative proportion of species, subspecies, and populations, and their rarity at time of listing. Approximately 80% of the taxa added to the list were full species, 18% were subspecies, and 2% were distinct populations segments of more widespread vertebrate species. The proportion of subspecies and populations was considerably higher among birds and mammals than among other groups. The median populations size at time of listing for vertebrate animals was 1075 individuals; for invertebrate animals it was 999. The median population size of a plant at time of listing was less than 120 individuals. Earlier listing of declining species could significantly improve the likelihood of successful recovery, and it would provide land managers and private citizens with more options for protecting vanishing plants and animals at less social or economic cost. 相似文献
10.