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81.
Sorption of selenium anionic species on apatites and iron oxides from aqueous solutions 总被引:3,自引:0,他引:3
Duc M Lefevre G Fedoroff M Jeanjean J Rouchaud JC Monteil-Rivera F Dumonceau J Milonjic S 《Journal of environmental radioactivity》2003,70(1-2):61-72
The sorption of selenite and selenate ions from aqueous solutions was investigated on hydroxyapatite, fluorapatite, goethite and hematite, in order to simulate the behavior of radioactive selenium in natural or artificial sorbing media. Correlation studies with acido-basic properties and solubility of the solids were also performed. The sorption is pH dependant, but these solids are very efficient for retaining selenite at pH values generally encountered in natural waters, with however higher K(d) values for oxides than apatites. Selenate ions are much less sorbed than selenite. Several methods such as electron microscopy and spectroscopic techniques were used to identify the sorption mechanisms. In the case of hydroxyapatite, sorption proceeds by substitution of phosphate groups in the lattice of the apatite crystal in the superficial layers of the solid. In the case of goethite and hematite, sorption can be interpreted and modeled by a surface complexation process, but there is a discrepancy between sorption site densities for selenite and for protons. 相似文献
82.
Do Thu Nga Vu Van Tu Pham Duc Phuc Hung Nguyen-Viet 《Journal of Material Cycles and Waste Management》2018,20(1):167-175
Material flow analysis (MFA) has been applied to assess the environmental impact of human activities on nutrient flows at the commune scale. This paper reports the assessment of human excreta and animal manure as a nutrient source for paddy fields and fishponds in Hoang Tay commune, Ha Nam province, Vietnam. The quality of MFA model was confirmed through modified uncertainty analysis, then was used to originally quantify and visualize the interlinks of livestock with the environmental sanitation and agricultural system in terms of nutrients. Currently, half of the pig manure was collected to the biogas, and the remainders were freely discharged to the commune’s drainage system (25%) or directly reused in the paddy fields (25%). While wastewater in the drainage system was the biggest source of nitrogen (contributed 46%), paddy field was the biggest source of phosphorous (contributed 55%) discharged to the Nhue River, totaling 57 ± 9 ton N and 29 ± 6 ton P, annually. Consequently, mitigation measures for nutrient resource management were proposed, and reducing half of chemical fertilizers applied and reusing all excreta and manure in the paddy fields were the most effective option. 相似文献
83.
Hiep Nguyen Duc Lisa Tzu-Chi Chang Merched Azzi Ningbo Jiang 《Environmental monitoring and assessment》2018,190(7):428
Environmental monitoring and modelling, especially in the regional context, has seen significant progress with the widely usage of satellite measurement in conjunction with local meteorological and air quality monitoring to understand the atmospheric dispersion and transport of air pollutants. This paper studies the application of these data and modelling tools to understand the environment effects of a major bushfire period in the state of New South Wales (NSW), Australia, in 2013. The bushfires have caused high pollution episodes at many sites in the greater Sydney metropolitan areas. The potential long-range transport of aerosols produced by bushfires to other region and states has been seen by regulators as a major concern. Using data and images collected from satellites, in addition to the results obtained from different simulations carried out using HYSPLIT trajectory model and a regional meteorological model called Conformal Cubic Atmospheric Model (CCAM), we were able to identify at least 2 days on which the smoke aerosols from bush fires in NSW has been transported at high altitude to the northern state of Queensland and the Coral Sea. As a result, widespread high particle concentration in South East Queensland including the Brisbane area, as measured by nearly all the air quality monitoring stations in this region, occurred on the day when the smoke aerosols intruded to lower altitude as indicated by the CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) Lidar measurements on the CALIPSO (Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation) satellite. The use of meteorological or air quality modelling to connect the ground-based measurements with satellite observations as shown in this study is useful to understand the pollutant transport due to bushfires and its impact on regional air quality. 相似文献
84.
Ian Christoplos Le Duc Ngoan Le Thi Hoa Sen Nguyen Thi Thanh Huong Lily Salloum Lindegaard 《Disasters》2017,41(3):448-467
How do disasters shape local government legitimacy in relation to managing climate‐ and disaster‐related risks? This paper looks at how local authorities in Central Vietnam perceive their social contract for risk reduction, including the partial merging of responsibilities for disaster risk management with new plans for and investments in climate change adaptation and broader socioeconomic development. The findings indicate that extreme floods and storms constitute critical junctures that stimulate genuine institutional change. Local officials are proud of their strengthened role in disaster response and they are eager to boost investment in infrastructure. They have struggled to reinforce their legitimacy among their constituents, but given the shifting roles of the state, private sector, and civil society, and the undiminished emphasis on high‐risk development models, their responsibilities for responding to emerging climate change scenarios are increasingly nebulous. The past basis for legitimacy is no longer valid, but tomorrow's social contract is not yet defined. 相似文献
85.
一株耐镉细菌的分离及其富集Cd的机理 总被引:4,自引:0,他引:4
从重金属镉污染土壤中筛选到一株对镉具有较强抗性和富集能力的细菌RC。经形态学观察和生理生化鉴定以及16SrDNA序列分析,RC为蜡状芽孢杆菌(Bacillus cereus)。在不同镉浓度液体培养条件下研究了菌体的生长曲线,并探讨了RC菌株对Zn、Cu的抗性,结果显示RC对不同重金属的抗性机制存在一定的差异。利用扫描电镜、透射电镜观察了镉在RC胞内外的沉积作用及分布情况,结果表明,在镉浓度为150 mg/L时菌体细胞壁及其内部可见大量的高电子密度颗粒,同时在菌体表面也有沉淀物附着。因此,胞内外沉积作用可能是该菌对高浓度镉的抗性和富集作用的重要途径。通过红外光谱探讨了RC积累镉前后细胞壁表面化学基团的变化情况,结果发现RC的细胞壁上参与积累作用的化学官能团主要有—OH、—NH、—CO和—CO—NH—等。 相似文献
86.
Thanigaivel S. Rajendran Saravanan Gnanasekaran Lalitha Chew Kit Wayne Tran Dang Thuan Tran Hoang-Dung Nghia Nguyen Khoi Show Pau Loke 《Environmental Chemistry Letters》2023,21(2):821-837
Environmental Chemistry Letters - Fossil fuel depletion and carbon dioxide emissions are calling for carbon neutral energies such as algal biofuels, yet actual production of agal biofuels is... 相似文献
87.
Zhengqing Cai Xiao Zhao Jun Duan Dongye Zhao Zhi Dang Zhang Lin 《Frontiers of Environmental Science & Engineering》2020,14(5):84
88.
Ngo Thanh Huy Van Dieu-Anh Tran Hoai Le Nakada Norihide Tanaka Hiroaki Huynh Trung Hai 《Environmental science and pollution research international》2021,28(10):12082-12091
Environmental Science and Pollution Research - This study evaluated the occurrence of PPCPs in Cau River (Vietnam). Surface water and sediment samples were collected to determine PPCP... 相似文献
89.
Nguyen Van-Truc Vo Thi-Dieu-Hien Tran Thanh-Dai Nguyen Thi-Nhu-Khanh Nguyen Thanh-Binh Dang Bao-Trong Bui Xuan-Thanh 《Environmental science and pollution research international》2021,28(45):63558-63571
Environmental Science and Pollution Research - The occurrence of arsenic (As) in groundwater (drilled well water) that were used for drinking, cooking, and personal hygiene and its risks to human... 相似文献
90.
Cong Fan Chuling Guo Junhui Zhang Cui Ding Xiaofei Li John R. Reinfelder Guining Lu Zhenqing Shi Zhi Dang 《环境科学学报(英文版)》2019,31(6):218-228
Schwertmannite is an amorphous iron(III)-oxyhydroxysulfate that forms in acid mine drainage(AMD) environments. The characteristic of high heavy metal adsorption capability makes schwertmannite a potentially useful, environmentally friendly material in wastewater treatment. Unstable schwertmannite is prone to recrystallization.Understanding the mechanisms that induce schwertmannite labilization and affect its capacity to remove heavy metals are of great environmental and geochemical significance.Thiocyanate(SCNˉ) is a hazardous pseudohalide that is also normally found in AMD.However, little is known about the impact of Fe(III)-binding ligand SCNˉ on schwertmannite stability and its subsequent capacity to bind trace elements. Here, we investigated the adsorption of SCNˉ on schwertmannite and subsequent mineral transformation to characterize this little-known process. The appearance of Fe2+indicated that the interactions between schwertmannite and SCNˉ may involve complexation and reduction reactions. Results showed that the majority of the adsorbed-SCNˉ was immobilized on schwertmannite during the 60-days transformation. The transformation rates of schwertmannite increased with increasing concentrations of SCNˉ. Goethite was detected as the dominant transformation product with or without SCNˉ. The mechanisms of SCNˉ-promoted dissolution of schwertmannite can be described as follows:(1) formation of Fe(III)–NCS complexes on the schwertmannite surface and in solution, a process which increases the reactivity of solid phase Fe(III);(2) the extraction of Fe(III) from schwertmannite by SCNˉ and subsequent schwertmannite dissolution; and(3) the formation of secondary minerals from extracted Fe(III). These findings may improve AMD treatment strategies and provide insight into the use and potential reuse of schwertmannite as a trace element sorbent. 相似文献