全文获取类型
收费全文 | 9999篇 |
免费 | 878篇 |
国内免费 | 2592篇 |
专业分类
安全科学 | 403篇 |
废物处理 | 188篇 |
环保管理 | 1863篇 |
综合类 | 7213篇 |
基础理论 | 1305篇 |
环境理论 | 7篇 |
污染及防治 | 913篇 |
评价与监测 | 1090篇 |
社会与环境 | 425篇 |
灾害及防治 | 62篇 |
出版年
2024年 | 79篇 |
2023年 | 281篇 |
2022年 | 384篇 |
2021年 | 445篇 |
2020年 | 442篇 |
2019年 | 401篇 |
2018年 | 311篇 |
2017年 | 425篇 |
2016年 | 433篇 |
2015年 | 510篇 |
2014年 | 510篇 |
2013年 | 700篇 |
2012年 | 674篇 |
2011年 | 736篇 |
2010年 | 592篇 |
2009年 | 585篇 |
2008年 | 490篇 |
2007年 | 658篇 |
2006年 | 668篇 |
2005年 | 488篇 |
2004年 | 445篇 |
2003年 | 482篇 |
2002年 | 414篇 |
2001年 | 402篇 |
2000年 | 364篇 |
1999年 | 263篇 |
1998年 | 220篇 |
1997年 | 186篇 |
1996年 | 159篇 |
1995年 | 119篇 |
1994年 | 116篇 |
1993年 | 85篇 |
1992年 | 79篇 |
1991年 | 60篇 |
1990年 | 44篇 |
1989年 | 18篇 |
1988年 | 15篇 |
1987年 | 29篇 |
1986年 | 16篇 |
1985年 | 11篇 |
1984年 | 8篇 |
1982年 | 16篇 |
1981年 | 18篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 16篇 |
1977年 | 5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
51.
52.
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
53.
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
54.
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
55.
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
56.
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
57.
面对日益突出的水污染问题,我国现行《水污染防治法》难以适应水污染防治的要求,《水污染防治法》的修订及相关立法问题在国家立法机构、行政部门和环境法学界因而备受关注。对当前我国环境法理论界和实践部门关于水污染防治立法的观点和主张以及相关研究进展和成果进行了系统分析和整理,从为完善我国《水污染防治法》提供立法参考的目的出发,运用概括、分类和归纳的方法,对我国水污染防治立法理念、机制和制度创新进行了分析和归纳,并提出了具体的立法建议。 相似文献
58.
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
59.
学龄儿童肺功能水平影响因素的研究 总被引:1,自引:0,他引:1
用逐步回归分析方法对与室内、外空气污染和机体状况等有关的因素对广州市学龄儿童肺功能 (FVC、FEV1 、PEFR和 FEF2 5~ 75 )水平的影响进行研究。结果提示 ,影响肺功能水平的主要因素是内因 ,身高的影响最明显 ,呼吸系统疾病或症状发生与肺功能水平下降有关 ;室外空气污染使肺功能水平下降 ,SO2 、NOx 和 PM2 .5 的影响明显 ,PM2 .5 的影响明显大于 PM1 0 和 TSP;居室或厨房通风不良、家庭烹饪用不洁燃料对儿童肺功能的生长不利 ;被动吸烟对女性儿童肺功能有不利影响。对各种影响因素 ,PEFR和 FEF2 5~ 75 比 FVC和 FEV1 更为敏感 相似文献
60.
天津市中心城区空气污染物时间变化规律的研究 总被引:5,自引:0,他引:5
根据空气质量标准,分析了SO2、NO2和PM103项污染物不同季节,不同时期,不同时段变化规律、达标状况以及为制定相应的防治措施提供参考依据。 相似文献