全文获取类型
收费全文 | 1457篇 |
免费 | 214篇 |
国内免费 | 620篇 |
专业分类
安全科学 | 299篇 |
废物处理 | 35篇 |
环保管理 | 123篇 |
综合类 | 912篇 |
基础理论 | 581篇 |
污染及防治 | 173篇 |
评价与监测 | 64篇 |
社会与环境 | 28篇 |
灾害及防治 | 76篇 |
出版年
2024年 | 9篇 |
2023年 | 36篇 |
2022年 | 71篇 |
2021年 | 82篇 |
2020年 | 61篇 |
2019年 | 103篇 |
2018年 | 93篇 |
2017年 | 107篇 |
2016年 | 112篇 |
2015年 | 110篇 |
2014年 | 100篇 |
2013年 | 255篇 |
2012年 | 133篇 |
2011年 | 135篇 |
2010年 | 102篇 |
2009年 | 111篇 |
2008年 | 76篇 |
2007年 | 112篇 |
2006年 | 88篇 |
2005年 | 80篇 |
2004年 | 42篇 |
2003年 | 42篇 |
2002年 | 45篇 |
2001年 | 32篇 |
2000年 | 25篇 |
1999年 | 18篇 |
1998年 | 23篇 |
1997年 | 17篇 |
1996年 | 14篇 |
1995年 | 15篇 |
1994年 | 11篇 |
1993年 | 7篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有2291条查询结果,搜索用时 15 毫秒
191.
调查了两个果园15~20年树龄的苹果树在连续用福美胂喷涂7~10年后树根、树皮、枝条、叶片、果实和土壤的砷含量,并和未使用福美胂的果树含量做了比较。结果表明,果实中有砷积累,但未超过食品卫生标准。使用福美胂的树皮、技条、叶片中砷含量比未使用福美胂的高儿倍~十几倍,树皮和短梢叶含量最高。枝条和叶片与树皮的砷含量有密切正相关。土壤表层虽有轻度积累,但不会对土壤生态环境有太大影响。 相似文献
192.
Sang-Woo Lee Ju-Yong Kim Jong-Un Lee IlWon Ko Kyoung-Woong Kim 《Environmental geochemistry and health》2004,26(3-4):403-409
In order to investigate the optimum conditions for the application of soil flushing of arsenic, a batch test was carried out using EDTA at various concentration and pH levels. Based on the optimum condition derived from the batch test, a column test was conducted to examine the feasibility of the soil-flushing technology under field-equivalent conditions. In this column test, a low flushing solution flow rate showed a significantly higher As removal efficiency (71.6%) than a high flow rate (56.3%). TCLP (toxicity characteristic leaching procedure) and a seed germination test were carried out to monitor the toxicity both during and after the treatment. The finally treated tailings were shown to be significantly remediated, having a reduced toxicity by both the TCLP and seed germination tests. 相似文献
193.
194.
This paper identifies newer areas of arsenic contamination in the District Kanker, which adjoins the District Rajnandgaon where high contamination has been reported earlier. A correlation with the mobile phase episodes of arsenic contamination has been identified, which further hinges on the complex geology of the area. Arsenic concentrations in both surface and groundwater, aquatic organisms (snail and water weeds) soil and vegetation of Kanker district and its adjoining area have been reported here. The region has been found to contain an elevated level of arsenic. All segments of the ecoysystem are contaminated with arsenic at varying degrees. The levels of arsenic vary constantly depending on the season and location. An analysis of groundwater from 89 locations in the Kanker district has shown high values of arsenic, iron and manganese (mean: 144, 914 and 371 μg L−1, respectively). The surface water of the region shows elevated levels of arsenic, which is influenced by the geological mineralised zonation. The most prevalent species in the groundwater is As(III), whereas the surface water of the rivers shows a significant contamination with the As(V) species. The analysis shows a bio-concentration of the toxic metals arsenic, nickel, copper and chromium. Higher arsenic concentrations (groundwater concentrations greater than 50 μg L−1) are associated with sedimentary deposits derived from volcanic rocks, hence mineral leaching appears to be the source of arsenic contamination. Higher levels of arsenic and manganese in the Kanker district have been found to cause impacts on the flora and fauna. A case study of episodic arsenical diarrhoea is presented. 相似文献
195.
Effect of natural organic matter on arsenic release from soils
and sediments into groundwater 总被引:6,自引:0,他引:6
Arsenic (As) contamination in groundwater has received significant attention recently. Natural and anthropogenic sources contribute to the worldwide occurrence of As contamination. As speciation is an important factor related to its toxic and mobile behavior. The release of As from soils and sediments into groundwater is governed by several geophysicochemical processes, of which, As sorption behavior is of principle significance. This review paper summarizes existing information regarding the effects of natural organic matter (NOM) on the fate and mobility of As species in the environment. NOM may enhance the release of As from soils and sediments into the soil solution, thereby facilitating As leaching into the groundwater. The main influencing mechanisms include competition for available adsorption sites, formation of aqueous complexes, and/or changes in the redox potential of site surfaces and As redox speciation. NOM may also serve as binding agents, thereby reducing As mobility. However, comparably little research has been performed on this aspect. Since most investigations have been done on purified minerals under laboratory conditions, further research involving various geological materials under natural environmental conditions is required. Development of proper geochemical conceptual models may provide means of predicting the role of NOM in arsenic leaching and/or immobilization. 相似文献
196.
197.
198.
Our study examines how personality and coping influence soldiers' psychological health among 648 US Army personnel who were at that time deployed in Iraq at the height of an insurgency. Conscientiousness, neuroticism, and extraversion were associated with different coping behaviors, and these were in turn related to psychological distress. Conscientiousness was positively associated with problem‐focused coping and negatively with avoidance coping, whereas neuroticism was most positively associated with avoidance coping. Extraversion was positively related to both seeking social support and avoidance coping. As expected, avoidance coping was positively associated with psychological distress. Coping style explained more variance in the relationship between personality and distress among soldiers who perceived higher levels of threat, thus supporting a moderated mediation hypothesis. We discuss implications for facilitating the stress coping of workers who face acute and potentially traumatic stress exposures. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
199.
In order to obtain the characteristics of in situ stress field in outburst mining area, using the hollow inclusion (HI) technique to measure the in situ stress of coal and gas outburst mining area. The measurement sites located in northeast, middle and east of china, which include eight mining areas such as Fuxin, Pingdingshan, Hebi and Huainan. Base on the analysis of measurement data from outburst mining area, conclusions could be obtained as follow: (a) major principal stress and minor principal stress is horizontal stress and interim principal stress is vertical stress, and the type of outburst area’s stress field is dynamic stress field; (b) the major principal stress and minor principal stress are higher than other regions and the tectonic stress is outstanding; and (c) the ratio of major principal and vertical stress is decrease with the increase of depth and the type of stress field is likely transfer dynamic to static. Thus, in situ stress plays a key role during the occurring and development of coal and gas outburst, which is an important reason of severe outburst in China. 相似文献
200.
基于电荷监测技术预测矿山动力灾害试验研究 总被引:2,自引:1,他引:1
为提高矿山动力灾害预测准确率,应用自主研制的电荷传感器,将标准煤样置于三轴压力室内进行应力-电荷试验。分析围压对煤样压缩破坏过程中电荷信号的影响。结合现场测试,揭示工作面开挖过程中煤体应力与煤壁表面感应电荷的时间和空间变化规律。试验结果表明,煤体压缩过程中电荷信号的变化与煤体所处的应力水平关系密切,处于应力集中区域和应力松弛区域的煤体有明显脉冲状电荷信号,原始应力区电荷信号平稳,电荷信号的变化超前于煤体应力的变化,围压对电荷信号有延缓、强化的作用。 相似文献