全文获取类型
收费全文 | 12326篇 |
免费 | 1130篇 |
国内免费 | 5004篇 |
专业分类
安全科学 | 455篇 |
废物处理 | 326篇 |
环保管理 | 1982篇 |
综合类 | 10331篇 |
基础理论 | 1790篇 |
环境理论 | 6篇 |
污染及防治 | 1778篇 |
评价与监测 | 1302篇 |
社会与环境 | 445篇 |
灾害及防治 | 45篇 |
出版年
2024年 | 95篇 |
2023年 | 396篇 |
2022年 | 592篇 |
2021年 | 672篇 |
2020年 | 665篇 |
2019年 | 608篇 |
2018年 | 538篇 |
2017年 | 610篇 |
2016年 | 711篇 |
2015年 | 727篇 |
2014年 | 741篇 |
2013年 | 1045篇 |
2012年 | 932篇 |
2011年 | 1040篇 |
2010年 | 814篇 |
2009年 | 785篇 |
2008年 | 674篇 |
2007年 | 872篇 |
2006年 | 865篇 |
2005年 | 626篇 |
2004年 | 566篇 |
2003年 | 645篇 |
2002年 | 530篇 |
2001年 | 481篇 |
2000年 | 425篇 |
1999年 | 327篇 |
1998年 | 244篇 |
1997年 | 224篇 |
1996年 | 198篇 |
1995年 | 144篇 |
1994年 | 144篇 |
1993年 | 97篇 |
1992年 | 87篇 |
1991年 | 69篇 |
1990年 | 42篇 |
1989年 | 23篇 |
1988年 | 16篇 |
1987年 | 32篇 |
1986年 | 16篇 |
1985年 | 13篇 |
1984年 | 8篇 |
1982年 | 15篇 |
1981年 | 18篇 |
1980年 | 13篇 |
1979年 | 10篇 |
1978年 | 16篇 |
1977年 | 6篇 |
1973年 | 8篇 |
1972年 | 9篇 |
1971年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
131.
132.
孙炳科 《安全.健康和环境》2012,12(5):35-38
对炼油企业恶臭污染源现状进行调查和分析,提出相应的控制对策,对目前存在的环保问题,提出整改措施. 相似文献
133.
周洪春 《辽宁城乡环境科技》2012,(4):46-47
无机氮和活性磷酸盐是营口近岸海域的特征污染物,对营口近岸海域造成了一定程度的污染。通过对营口近岸海域污染调查分析,提出了控制改善这种状况的建议和措施。 相似文献
134.
Carroll S Goonetilleke A Thomas E Hargreaves M Frost R Dawes L 《Environmental management》2006,38(2):286-303
Onsite wastewater treatment systems (OWTS) are becoming increasingly important for the treatment and dispersal of effluent
in new urbanised developments that are not serviced by centralised wastewater collection and treatment systems. However, the
current standards and guidelines adopted by many local authorities for assessing suitable site and soil conditions for OWTS
are increasingly coming under scrutiny due to the public health and environmental impacts caused by poorly performing systems,
in particular septic tank-soil adsorption systems. In order to achieve sustainable onsite wastewater treatment with minimal
impacts on the environment and public health, more appropriate means of assessment are required. This paper highlights an
integrated risk based approach for assessing the inherent hazards associated with OWTS in order to manage and mitigate the
environmental and public health risks inherent with onsite wastewater treatment. In developing a sound and cohesive integrated
risk framework for OWTS, several key issues must be recognised. These include the inclusion of relevant stakeholders throughout
framework development, the integration of scientific knowledge, data and analysis with risk assessment and management ideals,
and identification of the appropriate performance goals for successful management and mitigation of associated risks. These
issues were addressed in the development of the risk framework to provide a generic approach to assessing risk from OWTS.
The utilisation of the developed risk framework for achieving more appropriate assessment and management techniques for OWTS
is presented in a case study for the Gold Coast region, Queensland State, Australia. 相似文献
135.
Soil pollution with Cd is an environmental problem common in the world, and it is necessary to establish what Cd concentrations
in soil could be dangerous to its fertility from toxicity effects and the risk of transference of this element to plants and
other organisms of the food chain. In this study, we assessed Cd toxicity on soil microorganisms and plants in two semiarid
soils (uncultivated and cultivated). Soil ATP content, dehydrogenase activity, and plant growth were measured in the two soils
spiked with concentrations ranging from 3 to 8000 mg Cd/kg soil and incubated for 3 h, 20 days, and 60 days. The Cd concentrations
that produced 5%; 10%;, and 50%; inhibition of each of the two soil microbiological parameter studied (ecological dose, ED,
values) were calculated using two different mathematical models. Also, the effect of Cd concentration on plant growth of ryegrass
(Lolium perenne, L.) was studied in the two soils. The Cd ED values calculated for soil dehydrogenase activity and ATP content were higher
in the agricultural soils than in the bare soil. For ATP inhibition, higher ED values were calculated than for dehydrogenase
activity inhibition. The average yields of ryegrass were reduced from 5.03 to 3.56 g in abandoned soil and from 4.21 to 1.15
g in agricultural soil with increasing concentrations of Cd in the soil. Plant growth was totally inhibited in abandoned and
agricultural soils at Cd concentrations above 2000 and 5000 mg/kg soil, respectively. There was a positive correlation between
the concentration of Cd in the plants and the total or DTPA-extractable concentrations of Cd in the soil. 相似文献
136.
ABSTRACTInteraction of environmental pollution between peripheral areas has become a central topic in the field of resources and environment but little is known about the actual impact on peripheral areas in the current literature. This paper sets out a simultaneous equation model to investigate the spillover effect of environmental pollution between China’s peripheral areas utilizing the panel data of 218 cities in China. Making use of indicators for measuring the impact on environmental pollution, it identifies that environmental pollution between cities of China has a significant two-way spillover effect. After standardization of variables, it is found that the spillover effect of peripheral areas on urban environmental pollution cannot be neglected. Nearly, a third of the environmental pollution level in a city is induced by the environmental pollution in peripheral areas. If the indicator of environmental pollution in peripheral areas is missing, wrong conclusions will be drawn. Therefore, government should shift the emphasis of environmental regulation from local to global, and improve the overall environmental quality through coordinated management of regional environment. 相似文献
137.
红壤稻田系统有机物循环再利用潜力及增产作用 总被引:7,自引:0,他引:7
10年田间试验结果表明:红墩妥田系统有机养分循环再利用潜力大,水稻收获,年均从稻田系统中输出NPK的总量最大可达到224.7,53.0和271.4kg/hm^2,有机物循环再利用,年均可归N,P,K量最大分别为115.1,35.8和231.5kg/hm^2,占系统输总量的51.2%,67.5%g和85.3%,保持稻田系统内有机物循环再利用可提高系统生产力,在不施化肥的情况下,增产3056kg/hm^2,增施N肥,增产2753kg/hm^2,增施N,P肥,增产1543kg/hm^2;NPK配合,增产984kg/hm^2;有机物循环再利用还可增强稻田系统的稳产性能,降低稻谷产量的年际变异系数;有机物循环再利用对水稻的增产有着明显的残效叠加作用,在施用N,P,K化肥基础上圾机物养分循环再利用水稻增产率在试验期间的前5年为7.2%,后5年平均为9.4%。 相似文献
138.
Cr(Ⅵ)污染土壤的热解还原无害化处理 总被引:4,自引:2,他引:2
提出了用热解还原法对含铬土壤进行无害化处理的新技术,研究了热解温度、热解时间及土壤有机质对铬无害化处理的影响,分析了热解前后土壤中铬的元素形态的变化.同时还探讨了热解还原过程中Cr(Ⅵ)的无害化机制.结果表明,土壤中的有机质在热解还原过程中产生的挥发分对Cr(Ⅵ)的无害化起核心作用;在200~600℃范围内,Cr(Ⅵ)的还原量随着热解温度升高而增大,500.0℃最适合于经济有效地实现Cr(Ⅵ)的热解还原处理;Cr(Ⅵ)的热解还原过程较快.铬的形态分析结果表明,热解后可交换态和碳酸盐结合态铬量大大降低,大部分铬转化成了活性低的残渣态,极大地降低了铬的危害. 相似文献
139.
铁炭微电解预处理电路板废水 总被引:3,自引:0,他引:3
采用铁炭微电解法预处理电路板废水.结果表明,在进水pH为2.00、铁炭质量比为4:1、振荡时间为20 min的铁炭微电解静态实验最佳条件下,絮凝出水COD去除率为30%;在进水pH为2.00、铁炭质量比为4:1、水力停留时间为50 min的铁炭微电解柱动态实验最佳条件下,连续曝气.絮凝出水COD为11021 mg/L,COD去除率约为34%,BOD5/COD从0.12上升到0.32,可生化性提高,Cu2+质量浓度从9.11 mg/L下降至0.76 mg/L,降低了废水的生物毒性,为生化处理创造了条件. 相似文献
140.
江河水源地突发性水污染事故风险评价 总被引:5,自引:0,他引:5
近年来,我国江河饮用水水源地突发性水质污染事故频发,成为我国面临的最严重的环境问题之一.江河水源地突发性水质污染事件的风险评价是确保饮用水源地水质安全的重要手段,对突发性水质污染事故,采取适当的应急处理措施. 相似文献