全文获取类型
收费全文 | 1118篇 |
免费 | 10篇 |
国内免费 | 37篇 |
专业分类
安全科学 | 56篇 |
废物处理 | 90篇 |
环保管理 | 96篇 |
综合类 | 94篇 |
基础理论 | 174篇 |
环境理论 | 1篇 |
污染及防治 | 429篇 |
评价与监测 | 154篇 |
社会与环境 | 61篇 |
灾害及防治 | 10篇 |
出版年
2023年 | 30篇 |
2022年 | 143篇 |
2021年 | 106篇 |
2020年 | 46篇 |
2019年 | 48篇 |
2018年 | 58篇 |
2017年 | 73篇 |
2016年 | 66篇 |
2015年 | 33篇 |
2014年 | 44篇 |
2013年 | 143篇 |
2012年 | 48篇 |
2011年 | 64篇 |
2010年 | 45篇 |
2009年 | 30篇 |
2008年 | 32篇 |
2007年 | 28篇 |
2006年 | 23篇 |
2005年 | 12篇 |
2004年 | 19篇 |
2003年 | 10篇 |
2002年 | 8篇 |
2001年 | 8篇 |
2000年 | 8篇 |
1999年 | 5篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1970年 | 1篇 |
1964年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有1165条查询结果,搜索用时 15 毫秒
991.
A sequencing batch reactor (SBR) seeded with flocculated sludge and fed with synthetic wastewater was operated for an enhanced biological phosphorus removal (EBPR) process. Eight weeks after reactor startup, sludge granules were observed. The granules had a diameter of 0.5 to 3.0 mm and were brownish in color and spherical or ellipsoidal in shape. No significant change was observed in sludge granule size when operational pH was changed from 7 to 8. The 208-day continuous operation of the SBR showed that sludge granules were stably maintained with a sludge volume index (SVI) between 30 to 55 mL/g while securing a removal efficiency of 83% for carbon and 97% for phosphorus. Fluorescent in situ hybridization (FISH) confirmed the enrichment of polyphosphate accumulating organisms (PAOs) in the SBR. The observations of sludge granulation in this study encourage further studies in the development of granules-based EBPR process. 相似文献
992.
Ali I Khan TA Asim M 《Environmental science and pollution research international》2012,19(5):1668-1676
Purpose
Arsenic, a toxic metalloid in drinking water, has become a major threat for human beings and other organisms. In the present work, attempts have been made to remove arsenate from the synthetic as well as natural water of Ballia district, India by electrocoagulation method. Efforts have also been made to optimize the various parameters such as initial arsenate concentration, pH, applied voltage, processing time, and working temperature.Method
Electrocoagulation is a fast, inexpensive, selective, accurate, reproducible, and eco-friendly method for arsenate removal from groundwater. The present paper describes an electrocoagulation method for arsenate removal from groundwater using iron and zinc as anode and cathode, respectively.Results
The maximum removal of arsenate was 98.8% at 2.0?mg?L?1, 7.0, 3.0?V, 10.0?min, and 30°C as arsenate concentration, pH, applied voltage, processing time, and working temperature, respectively. Relative standard deviation, coefficient of determination (r 2), and confidence limits were varied from 1.50% to 1.59%, 0.9996% to 0.9998%, and 96.0% to 99.0%, respectively. The treated water was clear, colorless, and odorless without any secondary contamination. The developed and validated method was applied for arsenate removal of two samples of groundwater of Ballia district, U.P., India, having 0.563 to 0.805?mg?L?1, arsenate concentrations.Conclusions
The reported method is capable for the removal of arsenate completely (100% removal) from groundwater of Ballia district. There was no change in the groundwater quality after the removal of arsenate. The treated water was safe for drinking, bathing, and recreation purposes. Therefore, this method may be the choice of arsenate removal from natural groundwater. 相似文献993.
Ali N Dashti N Al-Mailem D Eliyas M Radwan S 《Environmental science and pollution research international》2012,19(3):812-820
Introduction
Transconjugant bacteria with combined potential for hydrocarbon utilization and heavy metal resistance were suggested by earlier investigators for bioremediation of soils co-contaminated with hydrocarbons and heavy metals. The purpose of this study was to offer evidence that such microorganisms are already part of the indigenous soil microflora. 相似文献994.
Nosrati R Olad A Maramifar R 《Environmental science and pollution research international》2012,19(6):2291-2299
PURPOSE AND METHOD: ZnO/polyaniline nanocomposite in core-shell structure was prepared by the synthesis and adsorption of polyaniline chains on the structure of ZnO nanoparticles. Fourier transform infrared and ultraviolet-visible (UV-Vis) spectroscopy, X-ray diffraction patterns, field emission scanning electron microscopy, and transmission electron microscopy were used to characterize the composition and structure of the nanocomposite. The nanocomposite was used as an active photocatalyst for photodegradation and removal of ampicillin in aqueous solution. RESULTS: UV-Vis spectroscopy studies showed that ZnO/polyaniline nanocomposite absorbs visible light irradiation as well as ultraviolet spectrum, and therefore, it can be photoactivated under visible and ultraviolet lights. The photocatalytic activity of ZnO/polyaniline nanocomposite in degradation of ampicillin molecules in aqueous solution under natural sunlight irradiation was evaluated and compared with that of ZnO nanoparticles and pristine polyaniline. The ZnO/polyaniline core-shell nanocomposite exhibited higher photocatalytic activity compared to ZnO nanoparticles and pristine polyaniline. The effect of operating conditions (pH, ZnO/polyaniline nanocomposite dosage, and ampicillin concentration) in the photocatalytic degradation of ampicillin using ZnO/polyaniline nanocomposite was investigated. The optimum conditions for maximum efficiency of ampicillin degradation under 120 min sunlight irradiation were found as 10 mg L(-1) dosage of ZnO/polyaniline nanocomposite, ampicillin concentration of 4.5 mg L(-1), and solution pH?=?5. Under optimum operating conditions, degradation efficiency was reached to 41% after 120 min of exposure to the sunlight irradiation. 相似文献
995.
Ghasem Sargazi Daryoush Afzali Ali Mostafavi S. Yousef Ebrahimipour 《Journal of Polymers and the Environment》2018,26(5):1804-1817
In this study, we have showed a facile route for fabrication of a novel microporous material based on chitosan (CS) and poly(vinyl alcohol) (PVA) biodegradable nanofibers that have high specific surface area, considerable porosity, and small diameter. Scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area analysis, and CHNS/O elemental analyser were applied to characterize the fabricated CS/PVA composite nanofibers. Moreover, the influences of spinning conditions including concentration, voltage, electrospinning distance, and flow rate, on size distribution and pore diameter of the final product were systematically studied using 2k?1 factorial design experiments, and the response surface optimization was used for determining the best synthesis parameter. The results obtained from 2K?1 factorial design experiments showed that electrospinning parameters influenced the size distribution and pore diameter of the CS/PVA microporous material. Based on the response surface methodology, the CS/PVA product could be obtained with a high microporous diameter of 1.8 nm and a small diameter distribution of 15.0 nm under optimized conditions. The obtained results showed that the fabricated samples could be utilized in different applications. 相似文献
996.
Aslam Rabia Sharif Faiza Baqar Mujtaba Nizami Abdul-Sattar Ashraf Uzma 《Environmental science and pollution research international》2023,30(4):8682-8697
Environmental Science and Pollution Research - Air pollution levels rise as a result of industrial and vehicular emissions, epidemiological issues such as asthma become more prevalent in Lahore,... 相似文献
997.
Shoaib Muhammad Zhang Shengzhong Ali Hassan 《Environmental science and pollution research international》2023,30(6):14029-14049
Environmental Science and Pollution Research - The emergence of the underlying blockchain technology of bitcoin has gained extensive attention from researchers and practitioners. As distributed... 相似文献
998.
Richard A. Valdez Colleen Cunningham Ali Effati Deborah L. Freeman 《Journal of the American Water Resources Association》2023,59(5):1084-1098
Warmwater fish habitat in the San Juan River of the southwestern United States has been reduced by over 30% as a result of water depletion, reservoir inundation, and cold-water dam releases combined with drought-related changes in hydrology. This reduction and a suite of other factors have contributed to declines in native fish populations including the federally endangered Colorado Pikeminnow (Ptychocheilus lucius) and Razorback Sucker (Xyrauchen texanus). Conservation efforts for these species include determining flow needs; protecting, managing, and augmenting habitats; and stocking hatchery fish. But the young of stocked fish have low survival due largely to a paucity of nursery habitat not being reformed and maintained under current conditions. Flow recommendations for Navajo Dam releases designed to mimic the river's natural hydrograph have not been met due to water shortages, and the desired outcomes of increased channel complexity and enhanced fish habitat have not been observed. Forecasted hydrology that includes ongoing drought shows that achieving the flow targets through further dam reoperations is unlikely. Mechanical construction of early life-stage habitats is a highly recommended complement to flow management for offsetting the effects of flow reduction and habitat loss. Habitats with features that are effective and resilient under a range of flows are important in counterbalancing the effects of climate change. 相似文献
999.
Shahid Muhammad Rizwan Wakeel Abdul Ishaque Wajid Ali Samia Soomro Kamran Baksh Awais Muhammad 《Environment, Development and Sustainability》2021,23(8):11310-11334
Environment, Development and Sustainability - Crop production is highly sensitive to climate. It is affected by long-term trends in average rainfall and temperature, inter-annual climate... 相似文献
1000.
Abd-Elkader Mahmoud Rabee Kabbash Ibrahim Ali El-Sallamy Rania M. El-Sawy Hossam Gad El-Sayyed Abdel-Hameed 《Environmental science and pollution research international》2020,27(30):37549-37556
Environmental Science and Pollution Research - Tramadol abuse is an increasingly alarming phenomenon among Egyptian Community especially among workers and drivers. Study profile and factors... 相似文献