全文获取类型
收费全文 | 555篇 |
免费 | 4篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 27篇 |
废物处理 | 28篇 |
环保管理 | 104篇 |
综合类 | 63篇 |
基础理论 | 101篇 |
污染及防治 | 154篇 |
评价与监测 | 58篇 |
社会与环境 | 35篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 11篇 |
2022年 | 22篇 |
2021年 | 18篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 19篇 |
2017年 | 16篇 |
2016年 | 21篇 |
2015年 | 13篇 |
2014年 | 25篇 |
2013年 | 58篇 |
2012年 | 14篇 |
2011年 | 28篇 |
2010年 | 26篇 |
2009年 | 20篇 |
2008年 | 24篇 |
2007年 | 24篇 |
2006年 | 22篇 |
2005年 | 13篇 |
2004年 | 17篇 |
2003年 | 18篇 |
2002年 | 17篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 4篇 |
1998年 | 9篇 |
1997年 | 10篇 |
1996年 | 9篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 9篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1979年 | 4篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1964年 | 2篇 |
1963年 | 2篇 |
1958年 | 2篇 |
1957年 | 2篇 |
1956年 | 4篇 |
1955年 | 4篇 |
排序方式: 共有574条查询结果,搜索用时 17 毫秒
221.
Roy M. Harrison Casimiro A. Pio 《Journal of the Air & Waste Management Association (1995)》2013,63(7):784-787
In recent years, the EPA has moved toward a risk assessment/risk reduction framework for making regulatory decisions. The Agency has taken a number of steps to assure the quality and consistency of the risk assessment component of those decisions. The first, and perhaps most important of these steps, is the development of Agency-wide risk assessment guidelines. Five guidelines have been published. They are: carcinogenicity, mutagenicity, developmental toxicity, chemical mixtures, and exposure. The provisions of the five guidelines are discussed in the context of the four components of risk assessment. Other activities designed to assure quality and consistency in risk assessments, reduce uncertainty in risk assessment, ensure a more efficient information exchange about risk and risk assessment, and develop the appropriate oversight mechanisms are also discussed. These include additional guidelines, the Risk Assessment Forum, risk assessment research, the Integrated Risk Information System, the Hazard Assessment Notification System, and the Risk Assessment Council. 相似文献
222.
Saikat Chowdhury Nanthi S. Bolan Balaji Seshadri Anitha Kunhikrishnan Hasintha Wijesekara Yilu Xu Jianjun Yang Geon-Ha Kim Donald Sparks Cornelia Rumpel 《Environmental science and pollution research international》2016,23(8):7099-7110
Co-composting biowastes such as manures and biosolids can be used to stabilize carbon (C) without impacting the quality of these biowastes. This study investigated the effect of co-composting biowastes with alkaline materials on C stabilization and monitored the fertilization and revegetation values of these co-composts. The stabilization of C in biowastes (poultry manure and biosolids) was examined by their composting in the presence of various alkaline amendments (lime, fluidized bed boiler ash, flue gas desulphurization gypsum, and red mud) for 6 months in a controlled environment. The effects of co-composting on the biowastes’ properties were assessed for different physical C fractions, microbial biomass C, priming effect, potentially mineralizable nitrogen, bioavailable phosphorus, and revegetation of an urban landfill soil. Co-composting biowastes with alkaline materials increased C stabilization, attributed to interaction with alkaline materials, thereby protecting it from microbial decomposition. The co-composted biowastes also increased the fertility of the landfill soil, thereby enhancing its revegetation potential. Stabilization of biowastes using alkaline materials through co-composting maintains their fertilization value in terms of improving plant growth. The co-composted biowastes also contribute to long-term soil C sequestration and reduction of bioavailability of heavy metals. 相似文献
223.
Saidur Rahman Chowdhury Ernest K. Yanful Allen R. Pratt 《Environmental science and pollution research international》2014,21(17):10096-10107
In this study, recycled Ni smelter slag has been used as a reactive medium for arsenic (As) removal from aqueous solutions. The results of the study showed that 10.16–11.43-cm long columns containing 451–550 g of slag operated for at least 65 days were able to remove 99–100 % As species from continuously flowing contaminated water at an initial As concentration of 10 mg/L. The removal capacities were found to be 1.039 to 1.054 mg As per g of slag. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy data also showed that electrostatic attraction and oxidation–reduction reactions between As species and mixed iron oxides present in the slag were the main mechanisms for the removal of arsenic from aqueous solutions. Theoretical multiplet analysis of XPS data revealed that the amount of goethite in the slag increased from 22 to 60 % during arsenic removal by adsorption and the percentage of magnetite decreased from 50 to 40 %. These changes indicate that redox-mediated reactions occurred as part of the As(V) removal process. Raman spectroscopy studies confirmed that, in addition to surface reactions, internal interactions between the slag and arsenic also occurred. The findings of the study suggest that recycled Ni smelter slag could be an effective low-cost reactive medium for a subsurface remediation system, such as a permeable reactive barrier. Recycling of waste material (slag) for the removal of another waste (arsenic) can significantly reduce the environmental footprint of metallurgical operations and hence contribute to sustainable development. Such recycling also decreases slag disposal costs and eliminates the need to purchase commercial reactive material or obtain expensive natural material for remediation purposes. 相似文献
224.
Koji Yachiguchi Noriko Matsumoto Yuki Haga Motoharu Suzuki Chisato Matsumura Masahiro Tsurukawa Toshihiro Okuno Takeshi Nakano Kimi Kawabe Kei-ichiro Kitamura Akira Toriba Kazuichi Hayakawa Vishwajit S. Chowdhury Masato Endo Atsuhiko Chiba Toshio Sekiguchi Masaki Nakano Yoshiaki Tabuchi Takashi Kondo Shigehito Wada Hiroyuki Mishima Atsuhiko Hattori Nobuo Suzuki 《Environmental science and pollution research international》2014,21(10):6365-6372
To analyze the effect of polychlorinated biphenyl (PCB) 118 on fish bone metabolism, we examined osteoclastic and osteoblastic activities, as well as plasma calcium levels, in the scales of PCB (118)-injected goldfish. In addition, effect of PCB (118) on osteoclasts and osteoblasts was investigated in vitro. Immature goldfish, in which the endogenous effects of sex steroids are negligible, were used. PCB (118) was solubilized in dimethyl sulfoxide at a concentration of 10 ppm. At 1 and 2 days after PCB (118) injection (100 ng/g body weight), both osteoclastic and osteoblastic activities, and plasma calcium levels were measured. In an in vitro study, then, both osteoclastic and osteoblastic activities as well as each marker mRNA expression were examined. At 2 days, scale osteoclastic activity in PCB (118)-injected goldfish increased significantly, while osteoblastic activity did not change significantly. Corresponding to osteoclastic activity, plasma calcium levels increased significantly at 2 days after PCB (118) administration. Osteoclastic activation also occurred in the marker enzyme activities and mRNA expressions in vitro. Thus, we conclude that PCB (118) disrupts bone metabolism in goldfish both in vivo and in vitro experiments. 相似文献
225.
Heavy metals are dangerous to aquatic organisms and it can be bioaccumulated in the food chain leading to diseases in human.
Cumulative effects of metals or chronic poisoning may occur as a result of long-term exposure even to low concentrations.
The accumulation of heavy metals varies depending upon the species, environmental conditions, and inhibitory processes. Concentrations
of zinc, copper, lead, and cadmium were determined in finfish and shellfish species in the Gangetic delta using a PerkinElmer
Sciex ELAN 5000 ICP mass spectrometer and expressed as milligrams per kilogram of dry weight. In finfish and shellfish species
the concentrations of Zn, Cu, Pb, and Cd were comparatively higher at stations 1 and 2 than the permissible level of WHO.
The concentration of metals exhibited significant spatial variation and followed the order station 1 > station 2 > station
3 > station 4, which may be related to different degree of contamination in different location. The metal accumulation exhibited
species specificity. 相似文献
226.
Sophie?GourguetEmail author Olivier?Thébaud Sarah?Jennings L.?Richard?Little Catherine?M.?Dichmont Sean?Pascoe Roy?A.?Deng Luc?Doyen 《Environmental Modeling and Assessment》2016,21(3):371-389
Fisheries management must address multiple, often conflicting objectives in a highly uncertain context. In particular, while the bio-economic performance of trawl fisheries is subject to high levels of biological and economic uncertainty, the impact of trawling on broader biodiversity is also a major concern for their management. The purpose of this study is to propose an analytical framework to formally assess the trade-offs associated with balancing biological, economic and non-target species conservation objectives. We use the Australian Northern Prawn Fishery (NPF), which is one of the most valuable federally managed commercial fisheries in Australia, as a case study. We develop a stochastic co-viability assessment of the fishery under multiple management objectives. Results show that, due to the variability in the interactions between the fishery and the ecosystem, current management strategies are characterized by biological and economic risks. Results highlight the trade-offs between respecting biological, economic and non-target species conservation constraints at each point in time with a high probability and maximizing the net present value of the fishery. 相似文献
227.
Ashis Bhattacharjee Haradhan Mandal Madhusudan Roy Joachim Kusz Wolfgang Hofmeister 《Environmental monitoring and assessment》2013,185(10):8673-8683
This paper deals with the physical nature of the fly ashes obtained from two thermal power plants, situated in West Bengal, India. The fly ash samples are characterized by using comprehensive techniques with an emphasis on their ultrafine nature. The particle sizes of the samples are estimated using scanning electron microcopy (SEM) and found to lie within 0.18–5.90 μm. For morphology and compositional analysis, we also use SEM coupled with energy dispersive X-ray spectrometry. From X-ray study of the fly ashes the nature of conglomeration is seen to be crystalline, and the major components are mullite (Al6Si2O13) and quartz (SiO2). The magnetic measurement of the fly ash samples was carried out by SQUID magnetometer. 57Fe Mössbauer spectra are obtained using a conventional constant-acceleration spectrometer with a 57Co/Rh Mössbauer source. The hyperfine parameters obtained, in general, support the findings as made from XRD analysis and provide a quantitative measure of different iron ions present in the samples. The paper presents experimental data on the physical aspects of the fly ash samples of the thermal power plants which comprise coarse, fine, and ultrafine magnetic particulate materials and attempts to provide an exhaustive analysis. 相似文献
228.
Maity S Roy S Chaudhury S Bhattacharya S 《Environmental pollution (Barking, Essex : 1987)》2008,151(1):1-7
The aim of this study was to provide fundamental data on the biochemical analysis of antioxidant defences in the earthworm exposed to low levels (75, 150, 300 mg kg(-1) soil) of Pb and Zn. In order to attain this objective, adult Lampito mauritii were exposed to different doses of Pb and Zn separately for 28 days and the concentrations of oxidized and reduced glutathione, activities of glutathione-S-transferase, glutathione peroxidase and glutathione reductase were assessed. Dose-dependent perturbations were observed in the glutathione-glutathione-S-transferase system and other antioxidant enzymes during the early phase of the exposure to Pb. In the Zn exposed earthworm, the glutathione-glutathione-S-transferase system remained stable and the stimulation of glutathione peroxidase and glutathione reductase activities occurred significantly only on day 14 at 300 mg Zn kg(-1). It is concluded that the antioxidants are directly involved in the adaptive response of Lampito mauritii for survival in metal contaminated soil. 相似文献
229.
The Science of Nature - 相似文献
230.