全文获取类型
收费全文 | 17946篇 |
免费 | 148篇 |
国内免费 | 112篇 |
专业分类
安全科学 | 432篇 |
废物处理 | 673篇 |
环保管理 | 1976篇 |
综合类 | 5452篇 |
基础理论 | 3773篇 |
环境理论 | 3篇 |
污染及防治 | 4252篇 |
评价与监测 | 931篇 |
社会与环境 | 650篇 |
灾害及防治 | 64篇 |
出版年
2018年 | 216篇 |
2017年 | 211篇 |
2016年 | 307篇 |
2015年 | 236篇 |
2014年 | 333篇 |
2013年 | 1197篇 |
2012年 | 400篇 |
2011年 | 550篇 |
2010年 | 522篇 |
2009年 | 577篇 |
2008年 | 615篇 |
2007年 | 638篇 |
2006年 | 563篇 |
2005年 | 484篇 |
2004年 | 521篇 |
2003年 | 488篇 |
2002年 | 463篇 |
2001年 | 630篇 |
2000年 | 431篇 |
1999年 | 292篇 |
1998年 | 207篇 |
1997年 | 198篇 |
1996年 | 197篇 |
1995年 | 244篇 |
1994年 | 249篇 |
1993年 | 214篇 |
1992年 | 228篇 |
1991年 | 238篇 |
1990年 | 256篇 |
1989年 | 236篇 |
1988年 | 187篇 |
1987年 | 187篇 |
1986年 | 183篇 |
1985年 | 186篇 |
1984年 | 208篇 |
1983年 | 190篇 |
1982年 | 202篇 |
1981年 | 215篇 |
1980年 | 175篇 |
1979年 | 189篇 |
1978年 | 153篇 |
1977年 | 150篇 |
1976年 | 150篇 |
1974年 | 148篇 |
1973年 | 146篇 |
1968年 | 157篇 |
1967年 | 184篇 |
1966年 | 154篇 |
1965年 | 148篇 |
1964年 | 151篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
291.
H. Hensel 《Die Naturwissenschaften》1974,61(8):369-369
292.
293.
294.
Mitigation and adaptation synergy in forest sector 总被引:1,自引:1,他引:1
N. H. Ravindranath 《Mitigation and Adaptation Strategies for Global Change》2007,12(5):843-853
Mitigation and adaptation are the two main strategies to address climate change. Mitigation and adaptation have been considered
separately in the global negotiations as well as literature. There is a realization on the need to explore and promote synergy
between mitigation and adaptation while addressing climate change. In this paper, an attempt is made to explore the synergy
between mitigation and adaptation by considering forest sector, which on the one hand is projected to be adversely impacted
under the projected climate change scenarios and on the other provide opportunities to mitigate climate change. Thus, the
potential and need for incorporating adaptation strategies and practices in mitigation projects is presented with a few examples.
Firstly, there is a need to ensure that mitigation programs or projects do not increase the vulnerability of forest ecosystems
and plantations. Secondly, several adaptation practices could be incorporated into mitigation projects to reduce vulnerability.
Further, many of the mitigation projects indeed reduce vulnerability and promote adaptation, for example; forest and biodiversity
conservation, protected area management and sustainable forestry. Also, many adaptation options such as urban forestry, soil
and water conservation and drought resistant varieties also contribute to mitigation of climate change. Thus, there is need
for research and field demonstration of synergy between mitigation and adaptation, so that the cost of addressing climate
change impacts can be reduced and co-benefits increased. 相似文献
295.
本文使用由不同的全球模拟所产生的区域性耦合海洋-大气模型,通过数值模型试验探讨了波罗的海气候未来可能的物理状况.将一些情景以及近来的一些气候模拟情况作了比较,以估计气候变化.海面温度总体平均明显地增高2.9℃.平均年平均增温的水平模式主要可由冰盖的减少解释.由大气向波罗的海的热输送表现出季节性变化周期秋季热损失减少,春季热吸收增加,夏季热吸收减少.年际间海面温度的变化一般是在增加.这与北部一些中平滑的频率分布有关.全部热收支表示出海面太阳辐射在增加,而太阳辐射增加由热通量其他组成成分的变化所平衡. 相似文献
296.
Torvanger Asbjørn Rypdal Kristin Kallbekken Steffen 《Mitigation and Adaptation Strategies for Global Change》2005,10(4):693-715
Carbon dioxide (CO2) capture and storage is increasingly being considered as an important climate change mitigation option. This paper explores
provisions for including geological CO2 storage in climate policy. The storage capacity of Norway's Continental Shelf is alone sufficient to store a large share
of European CO2 emissions for many decades. If CO2 is injected into oil reservoirs there is an additional benefit in terms of enhanced oil recovery. However, there are significant
technical and economic challenges, including the large investment in infrastructure required, with related economies of scale
properties. Thus CO2 capture, transportation and storage projects are likely to be more economically attractive if developed on a large scale,
which could mean involving two or more nations. An additional challenge is the risk of future leakages from storage sites,
where the government must take on a major responsibility. In institutional and policy terms, important challenges are the
unsettled status of geological CO2 storage as a policy measure in the Kyoto Protocol, lack of relevant reporting and verification procedures, and lack of decisions
on how the option should be linked to the flexibility mechanisms under the Kyoto Protocol. In terms of competitiveness with
expected prices for CO2 permits under Kyoto Protocol trading, the relatively high costs per tonne of CO2 stored means that geological CO2 storage is primarily of interest where enhanced oil recovery is possible. These shortcomings and uncertainties mean that
companies and governments today only have weak incentives to venture into geological CO2 storage. 相似文献
297.
298.
299.
300.