全文获取类型
收费全文 | 1209篇 |
免费 | 75篇 |
国内免费 | 366篇 |
专业分类
安全科学 | 86篇 |
废物处理 | 70篇 |
环保管理 | 88篇 |
综合类 | 683篇 |
基础理论 | 178篇 |
环境理论 | 1篇 |
污染及防治 | 402篇 |
评价与监测 | 54篇 |
社会与环境 | 52篇 |
灾害及防治 | 36篇 |
出版年
2023年 | 26篇 |
2022年 | 85篇 |
2021年 | 73篇 |
2020年 | 53篇 |
2019年 | 36篇 |
2018年 | 42篇 |
2017年 | 67篇 |
2016年 | 53篇 |
2015年 | 67篇 |
2014年 | 102篇 |
2013年 | 138篇 |
2012年 | 107篇 |
2011年 | 105篇 |
2010年 | 86篇 |
2009年 | 63篇 |
2008年 | 87篇 |
2007年 | 60篇 |
2006年 | 56篇 |
2005年 | 34篇 |
2004年 | 30篇 |
2003年 | 32篇 |
2002年 | 32篇 |
2001年 | 30篇 |
2000年 | 32篇 |
1999年 | 28篇 |
1998年 | 21篇 |
1997年 | 22篇 |
1996年 | 17篇 |
1995年 | 16篇 |
1994年 | 13篇 |
1993年 | 17篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有1650条查询结果,搜索用时 176 毫秒
871.
Weng HX Yan AL Hong CL Qin YC Pan L Xie LL 《Environmental geochemistry and health》2009,31(3):401-411
Radioactive iodide (125I) is used as a tracer to investigate the fate and transport of iodine in soil under various leaching conditions as well as
the dynamic transfer in a soil–plant (Chinese cabbage) system. Results show that both soils (the paddy soil and the sandy
soil) exhibit strong retention capability, with the paddy soil being slightly stronger. Most iodine is retained by soils,
especially in the top 10 cm, and the highest concentration occurs at the top most section of the soil columns. Leaching with
1–2 pore volume water does not change this pattern of vertical distributions. Early breakthrough and long tailing are two
features observed in the leaching experiments. Because of the relatively low peak concentration, the early breakthrough is
really not an environmental concern of contamination to groundwater. The long tailing implies that the retained iodine is
undergoing slow but steady release and the soils can provide a low but stable level of mobile iodine after a short period.
The enrichment factors of 125I in different plant tissues are ranked as: root > stem > petiole > leaf, and the 125I distribution in the young leaves is obviously higher than that in the old ones. The concentrations of 125I in soil and Chinese cabbage can be simulated with a dual-chamber model very well. The biogeochemical behaviors of iodine
in the soil-cabbage system show that cultivating iodized cabbage is an environmentally friendly and effective technique to
eliminate iodine deficiency disorders (IDD). Planting vegetables such as cabbage on the 129I-contaminated soil could be a good remediation technique worthy of consideration. 相似文献
872.
Pan Jiahua 《中国人口.资源与环境(英文版)》2011,9(2):28-38
The fundamental way of satisfying the basic needs of human development is to secure the basic needs,limit luxurious and wasteful emissions,and ensure the fulfillment of climate targets,so as to achieve intra-and intergenerational equity.In this paper,the author discusses and analyzes a series of challenges that the development has to face,such as poverty elimination,urbanization,and industrialization,and the problems of increased consumption that is brought about by the improvement of living standards;the author distinguishes the stock emission,which does not need annual updating,and the flow emission of regular consumption;the author also defines the standards of energy consumption and carbon emissions that can meet the basic needs.On this basis,the author proposes the concept and method of carbon budget,compares this method with other means,and in particular,studies and analyzes the implications of international equity and sustainability of carbon budget as part of the international climate regime design. 相似文献
873.
Climate change has become a hot topic in international environmental negotiations.For post-Kyoto international climate regime negotiations,many countries have proposed a variety of frameworks to share the emission reduction responsibilities and allocate carbon emission rights,and have tried to quantify the emission reduction obligations of all countries based on the perspectives of international equity and individual equity.In this paper,the authors have distinguished the concepts of carbon emissions rights based on these two perspectives respectively,have analyzed the relationship between carbon emissions per capita and economic development,and have calculated and compared the proportion of cumulative emissions per capita of different countries in history and future,and then authors conclude that emission reduction obligations should be allocated based on each country’s conditions,including historical emissions,development stage,and future demands.Developed countries should take the initiative to significantly reduce their emissions because they have already accomplished their industrialization process.However,developing countries are still in the process of industrialization,which requires more emission rights to meet their development needs.For China,the concept of carbon emissions based on individual equity can be used as a theoretical tool for the allocating the international carbon emissions rights. 相似文献
874.
Geng Chen Yong Chi Chunpeng Pan Jian-hua Yan Ming-jiang Ni 《Journal of Material Cycles and Waste Management》2011,13(3):219-224
An experimental study of methane–benzene binary mixture purification in a bench-scale reverse flow reactor is carried out.
Results for catalytic oxidation of the two hydrocarbons with remarkably discrepant chemical properties show that autothermal
catalytic combustion of very lean combustible concentration can be achieved with periodic feed reversal. Benzene is well removed,
but methane conversion is relatively low and mainly determined by the thermal level of the reactor. If methane is added as
auxiliary fuel to maintain autothermal operation when the volatile organic compound (VOC) concentration in the contaminated
air is too low, an excess amount is needed. The influences of gas superficial velocity, cycle period, and methane-to-benzene
ratio are discussed. A mathematical model is developed and solved using a FORTRAN code, with good correspondence being observed
between the two approaches. Results of experimental and numerical study indicate that, during catalytic oxidation of lean
VOCs in reverse flow reactor, the mutual inhibition effect between different kinds of hydrocarbon can be neglected. 相似文献
875.
As human populations expand and nonhuman animals decline, understanding the interactions between people and wildlife is essential.
For endangered species, appreciating the effect of human disturbance can be important for their conservation. However, a human
disturbance angle is often absent from ecological research, despite growing evidence of the negative impact of nonfatal human
interference. Here, we monitored Hainan Eld’s deer living within a reserve and translocated animals living amongst villagers.
We show that translocated deer deviated from a crepuscular activity pattern and became increasingly nocturnal, and most active
when villagers were not. It appears that translocated deer adapted over time to human disturbance and this pattern is similar
to that of other species during periods of hunting. People do not pose an actual threat to Eld’s deer, but their presence
triggered a response akin to predator avoidance and may be interfering with broader aspects of their biology and conservation. 相似文献
876.
电解絮凝法处理老龄垃圾渗滤液的实验研究 总被引:2,自引:1,他引:1
为考察简便低耗的电解材料处理效果,采用铸铁阳极电解絮凝法对老龄垃圾渗滤液进行了处理,通过正交实验和单因素实验考察了电解液浓度、电流密度、pH、极板间距对处理效果的影响.结果表明,电解絮凝法对该老龄垃圾渗滤液有较好的处理效果,当电流密度为50 mA/cm2、pH值为9、极板间距为2 cm、电解75 min后,COD和NH... 相似文献
877.
878.
879.
880.
Distribution of perfluorochemicals between sera and milk from the same mothers and implications for prenatal and postnatal exposures 总被引:1,自引:0,他引:1
Kim SK Lee KT Kang CS Tao L Kannan K Kim KR Kim CK Lee JS Park PS Yoo YW Ha JY Shin YS Lee JH 《Environmental pollution (Barking, Essex : 1987)》2011,159(1):169-174
The levels of six perfluorocarboxylates (PFCAs), four perfloroalkylsulfonates (PFASs), and one sulfonamide were measured in paired samples of maternal serum, umbilical cord serum, and breast milk. The maternal and cord sera were strongly correlated with each other for all measured compounds (r > 0.5 and p < 0.01). Nevertheless, there was a significant difference in compound composition profile between the two sera matrices, with a more depletion of the longer chain compounds in cord serum. The transfer efficiency values from maternal to cord serum (TFCS/MS) decreased by 70% with each increasing unit of -CF2 chain within a PFCA group, and for perfluorooctanesulfonate (PFOS), by a half compared to perfluorooctanoate (PFOA). In contrast to the strong correlation in concentrations between the two sera matrices, the pattern of compounds in breast milk differed considerably with those in sera. Accordingly, compound- and matrix-specific transfer must be considered when assessing prenatal and postnatal exposure. 相似文献