全文获取类型
收费全文 | 970篇 |
免费 | 64篇 |
国内免费 | 293篇 |
专业分类
安全科学 | 52篇 |
废物处理 | 70篇 |
环保管理 | 76篇 |
综合类 | 547篇 |
基础理论 | 177篇 |
污染及防治 | 288篇 |
评价与监测 | 39篇 |
社会与环境 | 29篇 |
灾害及防治 | 49篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 39篇 |
2021年 | 22篇 |
2020年 | 27篇 |
2019年 | 21篇 |
2018年 | 33篇 |
2017年 | 42篇 |
2016年 | 31篇 |
2015年 | 49篇 |
2014年 | 63篇 |
2013年 | 73篇 |
2012年 | 54篇 |
2011年 | 65篇 |
2010年 | 57篇 |
2009年 | 48篇 |
2008年 | 72篇 |
2007年 | 51篇 |
2006年 | 57篇 |
2005年 | 47篇 |
2004年 | 28篇 |
2003年 | 40篇 |
2002年 | 37篇 |
2001年 | 51篇 |
2000年 | 41篇 |
1999年 | 43篇 |
1998年 | 45篇 |
1997年 | 31篇 |
1996年 | 28篇 |
1995年 | 27篇 |
1994年 | 22篇 |
1993年 | 21篇 |
1992年 | 10篇 |
1991年 | 8篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1973年 | 1篇 |
排序方式: 共有1327条查询结果,搜索用时 765 毫秒
391.
Leachate recirculation: moisture content assessment by means of a geophysical technique 总被引:1,自引:0,他引:1
Guérin R Munoz ML Aran C Laperrelle C Hidra M Drouart E Grellier S 《Waste management (New York, N.Y.)》2004,24(8):785-794
Bioreactor technology is a waste treatment concept consisting in speeding up the biodegradation of landfilled waste by optimizing its moisture content through leachate recirculation. The measurement of variations in waste moisture content is critical in the design and control of bioreactors. Conventional methods such as direct physical sampling of waste reach their limits due to the interference with the waste matrix. This paper reviews geophysical measurements such as electrical direct current and electromagnetic slingram methods for measuring the electrical conductivity. Electrical conductivity is a property, which is linked to both moisture and temperature and can provide useful indications on the biodegradation environment in the waste mass. The study reviews three site experiments: a first experimentation shows the advantages (correlation between conductive anomaly and water seepage) but also the limits of geophysical interpretation; the two other sites allow the leachate recirculation to be tracked by studying the relative resistivity variation versus time from electrical 2D imaging. Even if some improvements are necessary to consider geophysical measurements as a real bioreactor monitoring tool, results are promising and could lead to the use of electrical 2D imaging in bioreactor designing. 相似文献
392.
A sensitivity analysis is performed to evaluate river temperature variations in response to changes in hydraulic and meteorological conditions. The effects of instream flow, river geometry, and weather factors on daily mean and daily maximum river temperatures are quantified by analytical solutions to a simplified model. The influence coefficient method is used to determine river temperature sensitivity. The sensitivity analysis presents quantitative evidence that river temperatures are more sensitive to instream flowrate, upstream inflow temperature, air temperature, humidity and solar radiation than to other parameters including wind speed and channel geometry and morphometry. It is found that the sensitivity of river temperatures to flow is as significant as that to weather. Daily maximum river temperature is more sensitive to flowrate than daily mean temperature. Adapting the concept of 'diminishing returns', a critical instream flowrate is identified, which divides high and low sensitivity of water temperatures to flowrate. The critical flowrate can be used to determine practically achievable and economically feasible flow requirements for summer river temperature control. The sensitivity results can assist in streamflow management and reservoir operation for protections of habitat and aquatic environment. 相似文献
393.
394.
不锈钢板卷生产过程中的危险因素及对策 总被引:1,自引:0,他引:1
根据国内的不锈钢板卷生产工艺状况 ,分析并指出了生产过程中可能出现的危险和有害因素 ,同时对生产性粉尘、噪声和高温进行了劳动条件分级 ,从而提出了相应的对策。 相似文献
395.
Ji-Guang Gu Shu-Pei Cheng Jianhua Liu Ji-Dong Gu 《Journal of Polymers and the Environment》2000,8(4):167-174
An electrochemical impedance spectroscopy (EIS) technique was evaluated for monitoring microbial degradation of electronic packaging polyimides. The microbial inoculum was a mixed culture of fungi isolated previously from deteriorated polyimides. The active fungal consortium comprised Aspergillus versicolor, Cladosporium cladosporioides, and a Chaetomium species. After inoculation, fungal growth on the polyimides resulted in distinctive EIS spectra indicative of polymer insulation failure, which directly related to polymer integrity. Degradation appeared to occur in a number of steps and two distinctive stages in the decline of film resistance were observed in the inoculated EIS cells within the 2 and 10 weeks after inoculation. The early stage of resistance decrease may be related to the ingress of water molecules and ionic species into the polymeric materials, whereas the second stage probably resulted from partial degradation of the polymers by fungal growth on the polymer film. The relationship between changes of impedance spectra and microbial degradation of the polymer was further supported by scanning electron microscopy (SEM) observations of fungi growing on the surface of the inoculated polyimides. Our data indicate that the EIS can be used in detection of early degradation of resistant polymers and polyimides that are susceptible to biodeterioration. 相似文献
396.
依据回顾性环境影响评价的内涵,结合其发展过程和作用,总结了回顾性环境影响评价工作的主要特点,并探索了今后该项工作的发展趋势。 相似文献
397.
研究了5%锐颈特县浮剂与95%马拉硫磷文替使用对麦穗鱼(Pseudorasbora paroa)乙酰胆碱酯酶(AChE,EC3.1.1.7)活性的影响。结果表明,0.2mg/L,锐颈物与2mg/L马拉硫磷交替使用均影响被抑制的AChE活性恢复。文中还探讨了研究农药影响对于合理评价农药环境毒性的意义。 相似文献
398.
系统分析、核定了沈阳市铁西区水污染物排放总量,通过对排污总量的可靠性分析和度量,提出了提高系统信息可靠性的监测与改进建议.认为加强泵站信息的监测与调查有利于对重金属类污染物实施总量控制;而且,在此基础上追加细河黄蜡坨子断面的监测不仅可以清晰识别细河入浑河的排污量,而且可以对有机污染物进行总量控制作出有针对性的、及时的反应. 相似文献
399.
Combined amendment reduces soil Cd availability and rice Cd accumulation in three consecutive rice planting seasons 总被引:1,自引:0,他引:1
Wenjun Yang Shilong Wang Hang Zhou Min Zeng Jingyi Zhang Fang Huang Shiping Shan Zhaohui Guo Hongwei Yi Zhiguang Sun Jiaofeng Gu Bohan Liao 《环境科学学报(英文版)》2022,34(1):141-152
The scientific application of stabilized materials has been considered an effective method for the in situ remediation of Cd-contaminated soil. This study aimed to investigate the persistence of the effect of a combined amendment of limestone and sepiolite(LS) on soil Cd availability and accumulation in rice grown in a mildly Cd-contaminated paddy field(0.45 mg/kg of Cd) over three consecutive rice seasons. 1125–4500 kg/ha of LS was applied to the soil before the first rice planting season and 5... 相似文献
400.
Guélat J Jaquiéry J Berset-Brändli L Pellegrini E Moresi R Broquet T Hirzel AH Perrin N 《Ecology》2008,89(7):2033-2042
Recent developments in metacommunity theory have raised awareness that processes occurring at regional scales might interfere with local dynamics and affect conditions for the local coexistence of competing species. Four main paradigms are recognized in this context (namely, neutral, patch-dynamics, species-sorting, and mass-effect), which differ according to the role assigned to ecological or life-history differences among competing species, as well as to the relative time scale of regional vs. local dynamics. We investigated the patterns of regional and local coexistence of two species of shrews (Crocidura russula and Sorex coronatus) sharing a similar diet (generalist insectivores) over four generations, in a spatially structured habitat at the altitudinal limit of their distributions. Local populations were small, and regional dynamics were strong, with high rates of extinction and recolonization. Niche analysis revealed significant habitat differentiation on a few important variables, including temperature and availability of winter resting sites. In sites suitable for both species, we found instances of local coexistence with no evidence of competitive exclusion. Patterns of temporal succession did not differ from random, with no suggestion of a colonization-competition trade-off. Altogether, our data provide support for the mass-effect paradigm, where regional coexistence is mediated by specialization on different habitat types, and local coexistence by rescue effects from source sites. The strong regional dynamics and demographic stochasticity, together with high dispersal rates, presumably contributed to mass effects by overriding local differences in specific competitive abilities. 相似文献