全文获取类型
收费全文 | 1278篇 |
免费 | 107篇 |
国内免费 | 395篇 |
专业分类
安全科学 | 118篇 |
废物处理 | 54篇 |
环保管理 | 115篇 |
综合类 | 717篇 |
基础理论 | 177篇 |
污染及防治 | 321篇 |
评价与监测 | 142篇 |
社会与环境 | 89篇 |
灾害及防治 | 47篇 |
出版年
2024年 | 6篇 |
2023年 | 28篇 |
2022年 | 84篇 |
2021年 | 54篇 |
2020年 | 61篇 |
2019年 | 46篇 |
2018年 | 40篇 |
2017年 | 65篇 |
2016年 | 63篇 |
2015年 | 76篇 |
2014年 | 95篇 |
2013年 | 107篇 |
2012年 | 113篇 |
2011年 | 123篇 |
2010年 | 86篇 |
2009年 | 104篇 |
2008年 | 96篇 |
2007年 | 70篇 |
2006年 | 75篇 |
2005年 | 55篇 |
2004年 | 29篇 |
2003年 | 53篇 |
2002年 | 46篇 |
2001年 | 38篇 |
2000年 | 35篇 |
1999年 | 28篇 |
1998年 | 11篇 |
1997年 | 26篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 11篇 |
1992年 | 8篇 |
1991年 | 2篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有1780条查询结果,搜索用时 15 毫秒
71.
河流上游的污水排放口或倒虹管等污水构筑因有可能发生事故出流而对下游的取水口存在着潜在的威胁,常规的单参数模型不能就事故出流对下游的影响作出公正评价。本文以QUAL-Ⅱ模型为骨架,以生动形象的动画形式演示出在整个排污过程中多个水质参数沿河道分布的变化全过程,并且,在模型中融入隶属度BP神经网络综合评价水质的模块,用它来对发生事故出流时下游取水口水域的水质变化进行综合评价,最后通过一个例子说明了该方法的优越性和合理性。 相似文献
72.
73.
74.
75.
Jiang HJ Ma Y Qiu GJ Wu FL Chen SL 《Journal of environmental science and health. Part. B》2011,46(8):703-708
The nicotine-degrading bacterium HZN1 was isolated from activated sludge and identified as Shinella sp. based on its physiological characteristics and analysis of 16S rDNA gene. Strain HZN1 is capable of using nicotine as the sole carbon source in the mineral salts medium. The optimum temperature and pH for strain HZN1 growth and nicotine degradation were 30°C and 7.0, respectively. It could degrade approximately 100 % of 0.5 g L(-1) of nicotine within 9 h. Three intermediate metabolites were produced by the strain HZN1 and identified as cotinine, myosmine and nicotyrine using gas chromatography-mass spectrometry. This is the first report of nicotine-degrading strain from the genus of Shinella. The results showed that strain HZN1 could be potentially employed in bioremediation of nicotine. Our findings would provide a new insight into the biodegradation of nicotine. 相似文献
76.
One hundred Cu-resistant-endophytic bacteria were isolated from Cu-tolerant plants grown on Cu mine wasteland, of which, eight Cu-resistant and 1-aminocyclopropane-1-carboxylate (ACC) deaminase-producing endophytic bacteria were obtained based on the ACC deaminase activity of the bacteria and characterized with respect to metal resistance, production of ACC deaminase, indole-3-acetic acid (IAA) as well as siderophores and mineral phosphate solubilization. Ralstonia sp. J1-22-2, Pantoea agglomerans Jp3-3, and Pseudomonas thivervalensis Y1-3-9 with higher ACC deaminase activity (ranging from 213 to 370 μM α-ketobutyrate mg(-1)h(-1)) were evaluated for promoting plant growth and Cu uptake of rape grown in quartz sand containing 0, 2.5, and 5 mg kg(-1) of Cu in pot experiments. The eight bacteria were found to exhibit different multiple heavy metal resistance characteristics, to show different levels of ACC deaminase activity and to produce indole acetic acid. Seven bacteria produced siderophores and solubilized inorganic phosphate. Pot experiments showed that inoculation with the strains (J1-22-2, Jp3-3, and Y1-3-9) was found to increase the biomass of rape. Increases in above-ground tissue Cu contents of rape cultivated in 2.5 and 5 mg kg(-1) of Cu-contaminated substrates varied from 9% to 31% and from 3 to 4-fold respectively in inoculated-rape plants compared to the uninoculated control. The maximum Cu uptake of rape was observed after inoculation with P. agglomerans Jp3-3. The results show that metal-resistant and plant growth promoting endophytic bacteria play an important role in plant growth and Cu uptake which may provide a new endophytic bacterial-assisted phytoremediation of Cu-contaminated environment. 相似文献
77.
78.
Phthalic acid and its photochemical degradation has been determined in snow and rainwater samples collected during winters (2003-2010) in the Southeast of Massachusetts using capillary gas chromatography (GC) with flame ionization and mass spectrometric detection. Water samples were dried using a rotary evaporator and derivatized with a 14% BF3/methanol reagent before GC analysis. The developed method proved simple and accurate. Phthalic acid was found in snow samples collected in a concentration range of 7.22-76.5 nM. The photodegradation of phthalate was carried out under 300 nm UV light. The direct photodecomposition of the acid is slow (5% h−1). However, the addition of dissolved Fe(III) species at 2.0 μM accelerated the light-induced degradation of phthalic acid by 3.5 times in the atmospheric water samples. Photodegradation rates of phthalic acid increases with decreasing pH value of water samples in the range of pH 2.8-4.5. 相似文献
79.
简述近年来可移动危险源的严重事故及惨痛教训,究其重要原因之一就是缺乏对可移动危险源的动态安全监控,指出开展可移动危险源动态安全监控的迫切性;从而对建立可移动危险源动态安全监控体系的指导思想与功能设计进行了比较深入的探索,利用全球移动通信系统(GSM),全球定位系统(GPS),地理信息系统(GIS)和计算机网络技术相结合,对可移动危险源实施动态安全监控,以实现对其严重事故的有效控制,并对完善可移动危险源动态安全监控体系作了进一步的展望。 相似文献
80.
采用振荡平衡法对富里酸(FA)吸附TNT的主要环境影响因素以及其热力学特性进行了研究。结果表明:随着pH值的升高,FA对TNT的吸附量先减少后增加,pH=7.0时吸附量最小;随着离子强度(IS)的增大,FA对TNT的吸附量逐渐增加;随着温度的升高,FA对TNT的吸附量逐渐减少;ΔH0=-5.62 kJ/mol、ΔG0 S0 < 0,表明FA对TNT的吸附为自发的放热反应,且吸附过程中系统的无序性降低。FA对TNT的吸附机制主要包括范德华力、疏水作用、偶极作用力以及氢键力,并且范德华力和疏水作用会随着温度的升高逐渐减弱。 相似文献