全文获取类型
收费全文 | 173篇 |
免费 | 3篇 |
国内免费 | 1篇 |
专业分类
废物处理 | 9篇 |
环保管理 | 22篇 |
综合类 | 11篇 |
基础理论 | 35篇 |
污染及防治 | 54篇 |
评价与监测 | 24篇 |
社会与环境 | 22篇 |
出版年
2023年 | 3篇 |
2022年 | 12篇 |
2021年 | 9篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 10篇 |
2017年 | 11篇 |
2016年 | 8篇 |
2015年 | 3篇 |
2014年 | 8篇 |
2013年 | 11篇 |
2012年 | 12篇 |
2011年 | 7篇 |
2010年 | 7篇 |
2009年 | 7篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1973年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有177条查询结果,搜索用时 46 毫秒
141.
Angana Sarkar Sufia K Kazy Pinaki Sar 《Environmental science and pollution research international》2014,21(14):8645-8662
Ten different Gram-negative arsenic (As)-resistant and As-transforming bacteria isolated from As-rich groundwater of West Bengal were characterized to assess their role in As mobilization. 16S rRNA gene analysis confirmed the affiliation of these bacteria to genera Achromobacter, Brevundimonas, Rhizobium, Ochrobactrum, and Pseudoxanthomonas. Along with superior As-resistance and As-transformation abilities, the isolates showed broad metabolic capacity in terms of utilizing a variety of electron donors and acceptors (including As) under aerobic and anaerobic conditions, respectively. Arsenic transformation studies performed under various conditions indicated highly efficient As3+ oxidation or As5+ reduction kinetics. Genes encoding As3+ oxidase (aioA), cytosolic As5+ reductase (arsC), and As3+ efflux pump (arsB and acr3) were detected within the test isolates. Sequence analyses suggested that As homeostasis genes (particularly arsC, arsB, and acr3) were acquired by most of the bacteria through horizontal gene transfer. A strong correlation between As resistance phenotype and the presence of As3+ transporter genes was observed. Microcosm study showed that bacterial strain having cytosolic As5+ reductase property could play important role in mobilizing As (as As3+) from subsurface sediment. 相似文献
142.
One of the major challenges in developing an effective phytoremediation technology for 2,4,6-trinitrotoluene (TNT) contaminated soils is limited plant uptake resulting from low solubility of TNT. The effectiveness of urea as a solubilizing agent in increasing plant uptake of TNT in hydroponic systems has been documented. Our preliminary greenhouse experiments using urea were also very promising, but further characterization of the performance of urea in highly-complex soil-solution was necessary. The present study investigated the natural retention capacity of four chemically variant soils and optimized the factors influencing the effectiveness of urea in enhancing TNT solubility in the soil solutions. Results show that the extent of TNT sorption and desorption varies with the soil properties, and is mainly dependent on soil organic matter (SOM) content. Hysteretic desorption of TNT in all tested soils suggests irreversible sorption of TNT and indicates the need of using an extractant to increase the release of TNT in soil solutions. Urea significantly (p < 0.0001) enhanced TNT extraction from all soils, by increasing its solubility at the solid/liquid interface. Soil organic matter content and urea application rates showed significant effects, whereas pH did not exert any significant effect on urea catalysis of TNT extraction from soil. The optimum urea application rates (125 or 350 mg kg−1) for maximizing TNT extraction were within the limits set by the agronomic fertilizer-N rates used for major agricultural crops. The data obtained from this batch study will facilitate the optimization of a chemically-catalyzed phytoremediation model for cleaning up TNT-contaminated soils. 相似文献
143.
Investigation into atmospheric deposition through precipitation studies at New Delhi (India) 总被引:6,自引:0,他引:6
U.C. Kulshrestha A.K. Sarkar S.S. Srivastava D.C. Parashar 《Atmospheric environment (Oxford, England : 1994)》1996,30(24):4149-4154
Rain water samples were collected during the monsoon of 1994, using automatic wet-only and manual bulk collectors at a height of 30 m above the ground at the National Physical Laboratory, New Delhi. The average pH of the rain water was 5.7 and its chemical composition was dominated by NH4 and SO4. The free acidity of the rain water was found to be due to S04 rather than N03 and it was mainly neutralized by NH4 and Ca. Calculation of sea salt fraction and enrichment factor revealed that this site is free for marine influence. On an average the bulk samples had 13% higher concentration than that of wet-only samples which may be due to the deposition of soil-derived particles during the 24 h period of exposure. The higher neutralization factors of Ca and Mg in bulk samples and highest dry deposition rates for Ca in comparison to other components, indicated the positive interference of dust particles in neutralization. 相似文献
144.
Singh Mandeep Sarkar Binoy Hussain Sabir Ok Yong Sik Bolan Nanthi S. Churchman Gordon Jock 《Environmental geochemistry and health》2018,40(1):563-563
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published. The author’s affiliation is... 相似文献
145.
Sarkar Aratrika Rajarathinam Ravikumar Venkateshan Ranganathan Budhi 《Environmental science and pollution research international》2021,28(13):15923-15933
Environmental Science and Pollution Research - Nitrogen and phosphorous are important nutritional regulators for the growth of cyanobacteria, thereby having a significant impact in bloom formation... 相似文献
146.
Meththika Vithanage Mihiri Seneviratne Mahtab Ahmad Binoy Sarkar Yong Sik Ok 《Environmental geochemistry and health》2017,39(6):1421-1439
Rapid surge of interest for carbon nanotube (CNT) in the last decade has made it an imperative member of nanomaterial family. Because of the distinctive physicochemical properties, CNTs are widely used in a number of scientific applications including plant sciences. This review mainly describes the role of CNT in plant sciences. Contradictory effects of CNT on plants physiology are reported. CNT can act as plant growth inducer causing enhanced plant dry biomass and root/shoot lengths. At the same time, CNT can cause negative effects on plants by forming reactive oxygen species in plant tissues, consequently leading to cell death. Enhanced seed germination with CNT is related to the water uptake process. CNT can be positioned as micro-tubes inside the plant body to enhance the water uptake efficiency. Due to its ability to act as a slow-release fertilizer and plant growth promoter, CNT is transpiring as a novel nano-carbon fertilizer in the field of agricultural sciences. On the other hand, accumulation of CNT in soil can cause deleterious effects on soil microbial diversity, composition and population. It can further modify the balance between plant-toxic metals in soil, thereby enhancing the translocation of heavy metal(loids) into the plant system. The research gaps that need careful attention have been identified in this review. 相似文献
147.
Anaya Ghosh Biswajit Debnath Sadhan Kumar Ghosh Bimal Das Jyoti Prakas Sarkar 《Journal of Material Cycles and Waste Management》2018,20(4):1969-1985
Worldwide solid waste generation is nearly 1.3 billion tonnes/year, whereas in India 62 million tonnes of solid waste is generated per year by 377 million urban people. The increasing amount of solid waste in India, nearly 50% of which is organic matter, is the major concern for treatment and waste management. Several technologies are already in practice for the treatment of organic fraction of municipal solid waste (OFMSW) in India. It is important to assess the sustainability of these processes. In this study, the existing OFMSW technologies in India were examined. Case-study approach was taken for this purpose along with some published secondary reports. It was found that the selection of technology quite depends on the composition of the OFMSW. Food waste rich fractions are recommended for biomethanation, whereas the fractions rich in market waste and household waste are suitable for composting. Fractions rich in lignin and lignocellulosic materials are suitable for pyrolysis and gasification, whereas the rejects are to be sent for RDF preparation. Based on the findings, a sustainable framework has also been proposed, implementation of which may result in better waste management. 相似文献
148.
Saumya Sarkar Hillary N. Yonce Ann Keeley Timothy J. Canfield Jonathan B. Butcher Michael J. Paul 《Journal of the American Water Resources Association》2019,55(2):497-510
A total maximum daily load for the Chesapeake Bay requires reduction in pollutant load from sources within the Bay watersheds. The Conestoga River watershed has been identified as a major source of sediment load to the Bay. Upland loads of sediment from agriculture are a concern; however, a large proportion of the sediment load in the Conestoga River has been linked to scour of legacy sediment associated with historic millpond sites. Clarifying this distinction and identifying specific segments associated with upland vs. channel sources has important implications for future management. In order to address this important question, we combined the strengths of two widely accepted watershed management models — Soil and Water Assessment Tool (SWAT) for upland agricultural processes, and Hydrologic Simulation Program FORTRAN (HSPF) for instream fate and transport — to create a novel linked modeling system to predict sediment loading from critical sources in the watershed including upland and channel sources, and to aid in targeted implementation of management practices. The model indicates approximately 66% of the total sediment load is derived from instream sources, in agreement with other studies in the region and can be used to support identification of these channel source segments vs. upland source segments, further improving targeted management. The innovated linked SWAT‐HSPF model implemented in this study is useful for other watersheds where both upland agriculture and instream processes are important sources of sediment load. 相似文献
149.
K.M.M. Hasan G. Sarkar M. Alamgir Q.H. Bari G. Haedrich 《Waste management (New York, N.Y.)》2012,32(11):2046-2055
This study is concerned with the performance of a Demo Compost Plant for the development of acceptable composting technology in Bangladesh. The Demo Compost Plant was setup at the adjacent area of an existing compost plant located at Khulna city in Bangladesh. Four different composting technologies were considered, where Municipal Solid Waste (MSW) were used as a raw material for composting, collected from the adjacent areas of the plant. Initially the whole composting system was conducted through two experimental setups. In the 1st setup three different types of aerators (horizontal and vertical passively aerator and forced aerator) were selected. For a necessary observation four piles, using only MSW as the input materials in the first three compost pile, the fourth one was the existing Samadhan’s compost pile. Based on the analysis of the experimental findings, the horizontal passively aerated composting technique is suitable for Bangladesh as it had better performance for reducing composting period than that of the others. It was being observed from the quality parameters of compost in the both 1st and 2nd setup that as the waste directly come from kitchen, degradation rate of waste shows a positive result for reducing this waste and there is no possibility of toxic contamination, when it would be used as a soil conditioner. Though there is no significant improvement in the quality of the final product in the 2nd setup as comparing with the 1st setup but it fulfills one of the main objectives of this study is to reduce the whole composting period as well as immediate management of the increasing amount of waste and reducing load on landfill. Selfheating tests reveal that degree of stability of compost with respect to maturation period was remained in the acceptable level, which was further accelerated due to the use of organic additives. 相似文献
150.
Anindita Sarkar Sucharita Sen Animesh Kumar 《Environment, Development and Sustainability》2009,11(4):751-763
There is a general contention among scholars that first, wheat–paddy cropping pattern is largely responsible for declining
ground water table in Punjab and secondly, that the wheat–paddy cropping system is becoming unsustainable over time as the
yield levels of these two major crops are stagnating. However, the existing evidences do not throw adequate insight into the
stage of groundwater depletion during which the wheat–paddy cycle becomes unsustainable. The paper strengthens the existing
empirical base of sustainability status of this cropping cycle in Punjab. A comparison of irrigation systems in terms of both
trends in yield and stability for wheat and paddy has been attempted to arrive at a holistic appraisal of sustainability aspects
of crop specialization in Punjab. It is observed that the canal dependent irrigation system has performed better as compared
to the overexploited groundwater irrigation system in terms of most of the parameters used in the study.
相似文献
Animesh KumarEmail: |