全文获取类型
收费全文 | 12611篇 |
免费 | 184篇 |
国内免费 | 316篇 |
专业分类
安全科学 | 364篇 |
废物处理 | 621篇 |
环保管理 | 2154篇 |
综合类 | 1741篇 |
基础理论 | 3017篇 |
环境理论 | 5篇 |
污染及防治 | 3078篇 |
评价与监测 | 922篇 |
社会与环境 | 1112篇 |
灾害及防治 | 97篇 |
出版年
2023年 | 82篇 |
2022年 | 148篇 |
2021年 | 149篇 |
2020年 | 95篇 |
2019年 | 158篇 |
2018年 | 213篇 |
2017年 | 236篇 |
2016年 | 321篇 |
2015年 | 263篇 |
2014年 | 360篇 |
2013年 | 1216篇 |
2012年 | 451篇 |
2011年 | 611篇 |
2010年 | 492篇 |
2009年 | 525篇 |
2008年 | 635篇 |
2007年 | 646篇 |
2006年 | 526篇 |
2005年 | 447篇 |
2004年 | 464篇 |
2003年 | 463篇 |
2002年 | 428篇 |
2001年 | 415篇 |
2000年 | 315篇 |
1999年 | 208篇 |
1998年 | 159篇 |
1997年 | 149篇 |
1996年 | 179篇 |
1995年 | 195篇 |
1994年 | 156篇 |
1993年 | 149篇 |
1992年 | 161篇 |
1991年 | 133篇 |
1990年 | 131篇 |
1989年 | 113篇 |
1988年 | 100篇 |
1987年 | 112篇 |
1986年 | 95篇 |
1985年 | 103篇 |
1984年 | 105篇 |
1983年 | 104篇 |
1982年 | 96篇 |
1981年 | 115篇 |
1980年 | 92篇 |
1979年 | 68篇 |
1978年 | 57篇 |
1977年 | 54篇 |
1976年 | 48篇 |
1973年 | 51篇 |
1972年 | 57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.
5.
S. N. Goroshkevich 《Russian Journal of Ecology》2008,39(3):168-175
A statistical analysis of interannual variation in a set of vegetative and generative characters over 13 years has been performed to characterize the growth and seed production dynamics of the Siberian stone pine (Pinus sibirica Du Tour) in the southeast of the forest zone in western Siberia. The results have shown that the range of fluctuations in most of vegetative characters is ordinary and their distribution is close to normal. The range of fluctuations in many generative characters is enormous (from 0 to +∞), and the distribution of their values is usually skewed, with low values being recorded several times more frequently than high values. Most variable are the proportion of abortive cones and other characters that are determined mainly in the spring of the pollination year. These characters account for a very high level of variation in the total seed production. 相似文献
6.
Collections made in the course of long-term field studies on ecology of the northern mole vole Ellobius talpinus Pall. in the Ural Region and neighboring areas (more than 2000 individuals from 24 points of the species range) were used
to analyze geographic variation in its coat color (color morphs). On the basis of long-term observations (1985–1999) on marked
animals from a polymorphic population (Kurtamyshskii raion, Kurgan oblast), the life spans of males and females and the dependence
of life span on population density and structure were estimated in animals of different color morphs. Each color morph of
E. talpinus was shown to have specific features of the seasonal dynamics of age structure and migrations. 相似文献
7.
8.
9.
10.