全文获取类型
收费全文 | 865篇 |
免费 | 97篇 |
国内免费 | 276篇 |
专业分类
安全科学 | 33篇 |
废物处理 | 83篇 |
环保管理 | 83篇 |
综合类 | 592篇 |
基础理论 | 124篇 |
污染及防治 | 195篇 |
评价与监测 | 95篇 |
社会与环境 | 23篇 |
灾害及防治 | 10篇 |
出版年
2024年 | 1篇 |
2023年 | 23篇 |
2022年 | 35篇 |
2021年 | 38篇 |
2020年 | 26篇 |
2019年 | 32篇 |
2018年 | 37篇 |
2017年 | 37篇 |
2016年 | 35篇 |
2015年 | 46篇 |
2014年 | 41篇 |
2013年 | 49篇 |
2012年 | 35篇 |
2011年 | 72篇 |
2010年 | 59篇 |
2009年 | 57篇 |
2008年 | 68篇 |
2007年 | 49篇 |
2006年 | 46篇 |
2005年 | 38篇 |
2004年 | 36篇 |
2003年 | 37篇 |
2002年 | 35篇 |
2001年 | 62篇 |
2000年 | 31篇 |
1999年 | 36篇 |
1998年 | 32篇 |
1997年 | 38篇 |
1996年 | 22篇 |
1995年 | 18篇 |
1994年 | 10篇 |
1993年 | 7篇 |
1992年 | 13篇 |
1991年 | 12篇 |
1990年 | 8篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1238条查询结果,搜索用时 93 毫秒
11.
This paper describes a method for determining reductions of SO2 emissions from coal- and oil-fired power stations, oil refineries and large industrial units in the UK taking into account their pollution potential. The method is based on the use of two gridded data sets: critical loads, which represent the sensitivity of the environment to acid deposition and modelled estimates of total (wet + dry) sulphur deposition for 646 point sources within the UK. An iterative method is used to identify and subsequently reduce emissions from point sources that contribute most to areas of critical loads exceedance. This paper demonstrates how the method may be used to determine an optimal allocation of emissions across the UK which yields the maximum amount of environmental protection per unit of emission.The paper then goes on to consider the changes that will have to take place within the UK power generation industry in order to meet the revised EC Large Combustion Plant Directive which comes into force on 1 January 2008. Particular emphasis is placed upon proposed emissions trading schemes and the environmental implications of allowing trading between stations with high and low pollution potentials. The paper concludes by suggesting that the emissions trading process should take into account the pollution potential of each source, irrespective of whether the proposed emission is within the plant's agreed emission limit. An approach based entirely on minimizing environmental damage rather than one which takes cost into account, as in current integrated assessment modelling, could provide an interesting approach across the rest of Europe. 相似文献
12.
确定不同保证率下的中国酸沉降临界负荷 总被引:6,自引:0,他引:6
在进行中国酸沉降临界负荷区划时 ,通常以 1°× 1°(经纬度 )的网格为单位进行计算 ,难以反映网格内不同生态系统对酸沉降敏感性的差异 .为了便于决策者根据临界负荷确定酸沉降控制对策 ,也为了使 1°× 1°的结果更具代表性和实用性 ,本研究确定了 0 1°× 0 1°网格为单位计算的中国酸沉降临界负荷 ,并在此基础上通过引入保证率的概念 ,得到了一系列与一定的经济技术水平相适应的、允许有一定损失的 1°× 1°的中国酸沉降临界负荷图 .利用累积分布函数 ,本研究还确定了不同保证率下的中国酸沉降超临界负荷分布和各省、市、自治区的酸沉降临界负荷 . 相似文献
13.
介绍寒冷地区小型硫磺回收的设计特点,包括选用一、二、三级冷凝器同壳、低噪音鼓风机;试生产中的改进经验,包括过程气用蒸汽夹套保温,带有硫封的被硫储罐. 相似文献
14.
This paper deals with the release of base cations and Al3+ at the treatment with simulated acid rain (SAR) in main soil types collected from South China. Results showed that the amounts of base cations increased obviously when the pH value of simulated acid rain was lower than 3.0 or 3.5. Compared with the leaching of K+ and Na+, the leaching of Ca2+ and Mg2+ was affected by the pH value of SAR. Only when the amounts of base cations leached from soils exceeded the cation exchange capacity, the pH value of leaching solutions decreased sharply and the amounts of released Al3+ increased. The H+ buffering mechanisms, which were affected notonly by the pH values of SAR, but also by the types and solid components of soils, were proposed for the main soils studied. 相似文献
15.
ThebufferingeffectsofaquaticsedimentsagainstacidicdepositionLiaoBohan;TangHongxiao(ResearehCenterforEco-EnvironmentalSciences... 相似文献
16.
针对沈阳市区二氧化硫污染现状 ,结合本市经济发展的实际 ,就如何削减二氧化硫的排放量 ,提出了 5项对策及有关的监督控制管理措施。 相似文献
17.
18.
本文分析了重庆市大气污染(SO_2、NO_x、TSP)的特征,报导重污染区儿童唾液溶菌酶含量明显低于相对污染区(P<0.00001),污染区儿童体内免疫功能下降;发现暴露于两种或两种以上因素(酸沉降物、被动吸烟、燃煤)时,对儿童唾液溶菌酶含量的影响远大于它们单一因素的作用(P<0.00001),经逐步回归分析,得Y=401.6869-68.1306X_5-42.3868X_1-20.8466X_4(r=0.7681,F值=185.08,P<0.00001);并针对重庆市大气污染的具体情况,提出一些有意义的建议措施。 相似文献
19.
Hao Jiming Li Guang Zhang Yang Xu Kangfn Ban Ling Wen Weimin Yang Jinlan Liu Ning 《环境科学学报(英文版)》1990,2(3):35-49
A deterministic linear programming model which optimizes the abatement of each SO2 emission source, is extended into a CCP form by introducing equations of probabilistic constrained through the incorporation of uncertainty in the source-receptor-specific transfer coefficients. Based on the calculation of SO2 and sulfate average residence time for Liuzhou City, a sulfur deposition model has been developed and the distribution of transfer coefficients have been found to be approximately log-normal. Sulfur removal minimization of the model shows that the abatement of emission sources in the city is more effective, while control cost optimization provides the lowest cost programmes for source abatement at each allowable deposition limit under varied environmental risk levels. Finally a practicable programme is recommended. 相似文献
20.