全文获取类型
收费全文 | 1473篇 |
免费 | 54篇 |
国内免费 | 147篇 |
专业分类
安全科学 | 111篇 |
废物处理 | 17篇 |
环保管理 | 210篇 |
综合类 | 572篇 |
基础理论 | 154篇 |
污染及防治 | 233篇 |
评价与监测 | 337篇 |
社会与环境 | 35篇 |
灾害及防治 | 5篇 |
出版年
2024年 | 4篇 |
2023年 | 38篇 |
2022年 | 26篇 |
2021年 | 42篇 |
2020年 | 36篇 |
2019年 | 33篇 |
2018年 | 29篇 |
2017年 | 42篇 |
2016年 | 57篇 |
2015年 | 53篇 |
2014年 | 48篇 |
2013年 | 79篇 |
2012年 | 51篇 |
2011年 | 86篇 |
2010年 | 49篇 |
2009年 | 116篇 |
2008年 | 92篇 |
2007年 | 104篇 |
2006年 | 75篇 |
2005年 | 59篇 |
2004年 | 44篇 |
2003年 | 47篇 |
2002年 | 66篇 |
2001年 | 53篇 |
2000年 | 51篇 |
1999年 | 50篇 |
1998年 | 40篇 |
1997年 | 37篇 |
1996年 | 32篇 |
1995年 | 23篇 |
1994年 | 28篇 |
1993年 | 16篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 5篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1982年 | 7篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 4篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1674条查询结果,搜索用时 15 毫秒
221.
Surficial sediment samples were wet digested (HNO3‐HCI‐HF) and analysed by atomic absorption spectroscopy. The background values in the area, and the Pollution Index Load in the sampling points were calculated. Metal inputs of continental origin are specially important in Deva, Oria and Urola river mouths. 相似文献
222.
Relationships between toxicities of substituted aromatic hydrocarbons to Daphnia magna and to Fathead minnows or Photobacterium phosphoreum were studied based on structure‐activity equations we established. Good relationships between toxicities of chemicals to Daphnia magna and to Fathead minnows, Photobacterium phosphoreum were found for a wide range of chemicals. The toxicity data of fish can be predicted by the toxicity data of Daphnia magna or Photobacterium phosphoreum. It is probable that the toxicities of chemicals to the three organisms are similar. 相似文献
223.
224.
225.
This study examines the relationship between air pollution, social deprivation and health in the city of Leeds, UK under a baseline and three distance-based road user charging (RUC) scenarios set at 2 pence, 10 pence and 20 pence/km. Through application of a series of linked models of traffic, emission and pollutant dispersion, air quality was modelled in response to RUC scenarios. The pollutant modelled were NO(2), PM(10), CO, benzene and 1,3-butadiene, though results of NO(2) are used in this study. The RUC scenarios were compared with the 'base' scenario, all set for the year 2005. The RUC initiatives result in the differences in ambient concentrations of NO(2). The study correlates NO(2) concentrations with derived indices of social deprivation and health. The study concludes that positive but weak relationship exists between air quality and social deprivation, and indicates that deprived population groups are disproportionately exposed to higher NO(2) levels. The relationship between air quality and health status of the population is weak. There is a strong relationship between social deprivation and health status of the population. The study concludes that RUC scenarios result in reducing disparity between affluent and deprived populations. 相似文献
226.
Michael Henry German PardoTsugio Nishimura Yoshitaka Kato 《Resources, Conservation and Recycling》2011,55(11):1060-1069
This paper investigated the effect of various amounts of low-grade recycled aggregates in concrete containing mineral admixtures at three different water-binder ratios on mechanical and environmental performance. The balance between durability and environmental impact for a given strength level similar to normal-use concrete was also examined using analytic hierarchy process. Results showed that increasing the water-binder ratio and volume of recycled aggregates reduced compressive strength and increased air permeability and drying shrinkage relative to normal aggregates. However, compared to normal-use concrete similar or better performance could be achieved, which was attributed to improvement of low-grade recycled aggregate performance when combined with fly ash. Similarly, CO2 emissions and volume of raw materials were lower than the normal-use concrete for all mixes. Concrete mixes with low air permeability and low CO2 footprint had the best balance of durability and environmental impact, as decreasing raw material volume tended to more greatly reduce durability. 相似文献
227.
228.
Growth and pollution convergence: Theory and evidence 总被引:3,自引:0,他引:3
C. Ordás Criado S. Valente T. Stengos 《Journal of Environmental Economics and Management》2011,62(2):199-214
Stabilizing pollution levels in the long run is a pre-requisite for sustainable growth. We develop a neoclassical growth model with endogenous emission reduction predicting that, along optimal sustainable paths, pollution growth rates are (i) positively related to output growth (scale effect) and (ii) negatively related to emission levels (defensive effect). This dynamic law reduces to a convergence equation that is empirically tested for two major and regulated air pollutants – sulfur oxides and nitrogen oxides – with a panel of 25 European countries spanning the years 1980–2005. Traditional parametric models are rejected by the data. More flexible regression techniques confirm the existence of both the scale and the defensive effect, supporting the model predictions. 相似文献
229.
Trade, technology, and the environment: Does access to technology promote environmental regulation? 总被引:2,自引:0,他引:2
Mary Lovely 《Journal of Environmental Economics and Management》2011,61(1):16-35
Focusing specifically on regulation of coal-fired power plants, we examine how technological innovation by early adopters influences the timing of new environmental regulation in non-innovating countries. We build a general equilibrium model of an open economy to identify the political-economy determinants of regulation. With a newly created dataset of SO2 and NOx regulations for coal-fired power plants and a patent-based measure of the technology frontier, we estimate the determinants of environmental regulation diffusion. Our findings support the hypothesis that international economic integration eases access to environmentally friendly technologies and leads to earlier adoption, ceteris paribus, of regulation in non-innovating countries. However, we also find evidence that domestic trade protection promotes earlier adoption allowing shifts of regulatory costs to domestic consumers. Furthermore, international market power permits large countries to shift costs to foreign consumers. Other political economy factors, such as the quality of domestic coal, are also important determinants. 相似文献
230.
汞的毒性、环境行为、生物有效性不仅跟其浓度有关,还决定于其化学形态,因此汞的形态分析在环境科学中具有重要意义。样品前处理几乎是汞形态分析研究中不可或缺的步骤,而色谱和光谱/质谱联用技术是目前普遍采用的分离检测方法。文章对近十年来这些方面的研究进展进行了综述,主要包括样品的前处理方法如酸/碱溶剂萃取、微波辅助萃取、固相萃取、固相微萃取、单滴微萃取、分散液液微萃取等,以及色谱(液相色谱、气相色谱)和毛细管电泳与光谱/质谱(紫外可见光谱、原子吸收光谱、原子荧光光谱、等离子体质谱等)的联用技术在汞化合物形态分析中的应用情况。最后提出今后应重点研究建立高效、简便的前处理方法,发展高分离度、高灵敏度、高速度的分离检测联用技术,以便更好地对汞的形态进行分析监测。 相似文献