全文获取类型
收费全文 | 27961篇 |
免费 | 240篇 |
国内免费 | 179篇 |
专业分类
安全科学 | 563篇 |
废物处理 | 1394篇 |
环保管理 | 4337篇 |
综合类 | 4629篇 |
基础理论 | 7419篇 |
环境理论 | 11篇 |
污染及防治 | 6023篇 |
评价与监测 | 1898篇 |
社会与环境 | 1991篇 |
灾害及防治 | 115篇 |
出版年
2019年 | 126篇 |
2018年 | 1757篇 |
2017年 | 1674篇 |
2016年 | 1509篇 |
2015年 | 387篇 |
2014年 | 309篇 |
2013年 | 1446篇 |
2012年 | 933篇 |
2011年 | 2036篇 |
2010年 | 1284篇 |
2009年 | 1234篇 |
2008年 | 1643篇 |
2007年 | 2089篇 |
2006年 | 647篇 |
2005年 | 566篇 |
2004年 | 542篇 |
2003年 | 680篇 |
2002年 | 651篇 |
2001年 | 562篇 |
2000年 | 427篇 |
1999年 | 313篇 |
1998年 | 248篇 |
1997年 | 201篇 |
1996年 | 245篇 |
1995年 | 247篇 |
1994年 | 259篇 |
1993年 | 241篇 |
1992年 | 247篇 |
1991年 | 220篇 |
1990年 | 254篇 |
1989年 | 230篇 |
1988年 | 193篇 |
1987年 | 195篇 |
1986年 | 186篇 |
1985年 | 203篇 |
1984年 | 206篇 |
1983年 | 217篇 |
1982年 | 194篇 |
1981年 | 213篇 |
1980年 | 186篇 |
1979年 | 166篇 |
1978年 | 162篇 |
1977年 | 145篇 |
1976年 | 147篇 |
1975年 | 127篇 |
1974年 | 147篇 |
1973年 | 134篇 |
1972年 | 131篇 |
1971年 | 116篇 |
1967年 | 121篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Rudra P. Pradhan Mahendhiran S. Nair Mak B. Arvin John H. Hall 《Natural resources forum》2023,47(3):435-483
This article postulates strong endogenous relationships in lower income countries between institutional quality, financial development and sustained economic growth. These associations were investigated using the vector-error correction model (VECM) and Granger causality method for a sample of 79 countries from 2005 to 2022. The findings show that (1) these variables reinforce each other in the short run. (2) In the long run, both institutional quality and financial development can fuel economic growth. (3) The positive effect of institutional quality on economic growth is greater than that of financial development. Policy implications of these findings are that careful attention should be paid to co-development policies to enhance the institutional quality and the financial system in these economies. Policies should also consider economic growth strategies to enable sustainable economic growth rates. 相似文献
2.
Mughal Nafessa Kashif Maryam Arif Asma Guerrero John William Grimaldo Nabua Wilson C. Niedbała Gniewko 《Environmental science and pollution research international》2021,28(46):65116-65126
Environmental Science and Pollution Research - This study aims to re-examine the impacts of monetary and fiscal policy on environmental quality in ASEAN countries from 1990 to 2019. We utilized the... 相似文献
3.
4.
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
5.
Chad L. Hewitt Marnie L. Campbell Ronald E. Thresher Richard B. Martin Sue Boyd Brian F. Cohen David R. Currie Martin F. Gomon Michael J. Keough John A. Lewis Matthew M. Lockett Nicole Mays Matthew A. McArthur Tim D. O'Hara Gary C. B. Poore D. Jeff Ross Melissa J. Storey Jeanette E. Watson Robin S. Wilson 《Marine Biology》2004,144(1):183-202
Port Phillip Bay (PPB) is a large (1,930 km2), temperate embayment in southern Victoria, Australia. Extensive bay-wide surveys of PPB have occurred since 1840. In 1995/1996 the Commonwealth Scientific and Industrial Research Organization (CSIRO) Centre for Research on Introduced Marine Pests (CRIMP) undertook an intensive evaluation of the region with the aims of developing a comprehensive species list of native and introduced biota and contrasting previous bay-wide assessments with a current field survey in order to detect new incursions and discern alterations to native communities. Two methods were used to meet these aims: a re-evaluation of regional museum collections and published research in PPB to identify and determine the timing of introductions; and field surveys for benthic (infauna, epifauna and encrusting) organisms between September 1995 to March 1996. One hundred and sixty introduced (99) and cryptogenic (61) species were identified representing over 13% of the recorded species of PPB. As expected, the majority of these are concentrated around the shipping ports of Geelong and Melbourne. Invasions within PPB appear to be increasing, possibly due to an increase in modern shipping traffic and an increase in aquaculture (historically associated with incidental introductions); however the records of extensive biological surveys suggest that this may, in part, be an artefact of sampling effort. In contrast to Northern Hemisphere studies, PPB (and Southern Hemisphere introductions in general) have significantly different suites of successfully invading taxa. PPB is presented as one of the most invaded marine ecosystems in the Southern Hemisphere.Communicated by M.S. Johnson, Crawley 相似文献
6.
Large Estimates of Minimum Viable Population Sizes 总被引:2,自引:0,他引:2
7.
8.
The periodicity of fires in larch forests of Evenkia and their relationship with landscape elements have been studied. Cross-sections with “burns” in them caused by past fires have been analyzed in 72 test plots; the fire chronology encompassed the period from the 15th to the 20th century. The between-fire intervals (BFIs) have been calculated by two methods: (I) on the basis of burns alone and (II) on the basis of burns and the start of growth of the new generation of larch after the earliest fire. The BFI depends on local orographic features; it is 86 ± 11 (105 ± 12), 61 ± 8 (73 ± 8), 139 ± 17 (138 ± 18), and 68 ± 14 (70 ± 13) years for northeastern slopes, southwestern slopes, bogs, and flatlands, respectively. The mean BFIs calculated by methods I and II are 82 ± 7 and 95 ± 7 years, respectively. The permafrost horizon rises at a mean rate of 0.3 cm per year after a forest fire. It has been shown that the number of fires regularly peaks at periods of 36 and 82 years. There is also a temporal trend in fire frequency: the mean BFI was approximately 100 years in the 19th century and 65 years in the 20th century. 相似文献
9.
10.