全文获取类型
收费全文 | 20172篇 |
免费 | 174篇 |
国内免费 | 169篇 |
专业分类
安全科学 | 472篇 |
废物处理 | 923篇 |
环保管理 | 2252篇 |
综合类 | 3130篇 |
基础理论 | 5725篇 |
环境理论 | 5篇 |
污染及防治 | 5209篇 |
评价与监测 | 1439篇 |
社会与环境 | 1263篇 |
灾害及防治 | 97篇 |
出版年
2022年 | 188篇 |
2021年 | 149篇 |
2020年 | 122篇 |
2019年 | 145篇 |
2018年 | 373篇 |
2017年 | 390篇 |
2016年 | 579篇 |
2015年 | 364篇 |
2014年 | 561篇 |
2013年 | 1398篇 |
2012年 | 980篇 |
2011年 | 1088篇 |
2010年 | 740篇 |
2009年 | 705篇 |
2008年 | 821篇 |
2007年 | 878篇 |
2006年 | 736篇 |
2005年 | 965篇 |
2004年 | 1072篇 |
2003年 | 940篇 |
2002年 | 578篇 |
2001年 | 730篇 |
2000年 | 522篇 |
1999年 | 297篇 |
1998年 | 192篇 |
1997年 | 224篇 |
1996年 | 210篇 |
1995年 | 257篇 |
1994年 | 250篇 |
1993年 | 187篇 |
1992年 | 211篇 |
1991年 | 198篇 |
1990年 | 213篇 |
1989年 | 196篇 |
1988年 | 154篇 |
1987年 | 164篇 |
1986年 | 154篇 |
1985年 | 159篇 |
1984年 | 149篇 |
1983年 | 144篇 |
1982年 | 126篇 |
1981年 | 120篇 |
1980年 | 116篇 |
1979年 | 126篇 |
1978年 | 101篇 |
1977年 | 113篇 |
1975年 | 90篇 |
1974年 | 89篇 |
1973年 | 97篇 |
1972年 | 89篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
991.
Scheutz C Samuelsson J Fredenslund AM Kjeldsen P 《Waste management (New York, N.Y.)》2011,31(5):1009-1017
A double tracer technique was used successfully to quantify whole-site methane (CH4) emissions from Fakse Landfill. Emissions from different sections of the landfill were quantified by using two different tracers. A scaled-down version of the tracer technique measuring close-by to localized sources having limited areal extent was also used to quantify emissions from on-site sources at the landfill facility, including a composting area and a sewage sludge storage pit. Three field campaigns were performed. At all three field campaigns an overall leak search showed that the CH4 emissions from the old landfill section were localized to the leachate collection wells and slope areas. The average CH4 emissions from the old landfill section were quantified to be 32.6 ± 7.4 kg CH4 h−1, whereas the source at the new section was quantified to be 10.3 ± 5.3 kg CH4 h−1. The CH4 emission from the compost area was 0.5 ± 0.25 kg CH4 h−1, whereas the carbon dioxide (CO2) and nitrous oxide (N2O) flux was quantified to be in the order of 332 ± 166 kg CO2 h−1 and 0.06 ± 0.03 kg N2O h−1, respectively. The sludge pit located west of the compost material was quantified to have an emission of 2.4 ± 0.63 kg h−1 CH4, and 0.03 ± 0.01 kg h−1 N2O. 相似文献
992.
Municipal solid waste generation in municipalities: quantifying impacts of household structure, commercial waste and domestic fuel 总被引:1,自引:0,他引:1
Waste management planning requires reliable data concerning waste generation, influencing factors on waste generation and forecasts of waste quantities based on facts. This paper aims at identifying and quantifying differences between different municipalities' municipal solid waste (MSW) collection quantities based on data from waste management and on socio-economic indicators. A large set of 116 indicators from 542 municipalities in the Province of Styria was investigated. The resulting regression model included municipal tax revenue per capita, household size and the percentage of buildings with solid fuel heating systems. The model explains 74.3% of the MSW variation and the model assumptions are met. Other factors such as tourism, home composting or age distribution of the population did not significantly improve the model. According to the model, 21% of MSW collected in Styria was commercial waste and 18% of the generated MSW was burned in domestic heating systems. While the percentage of commercial waste is consistent with literature data, practically no literature data are available for the quantity of MSW burned, which seems to be overestimated by the model. The resulting regression model was used as basis for a waste prognosis model (Beigl and Lebersorger, in preparation). 相似文献
993.
Karin S. Holland Raymond E. Lewis Karina Tipton Stella Karnis Carol Dona Erik Petrovskis Louis P. Bull Deborah Taege Christopher Hook 《补救:环境净化治理成本、技术与工艺杂志》2011,21(3):7-38
The US Sustainable Remediation Forum (SURF) created this Framework to enable sustainability parameters to be integrated and balanced throughout the remediation project life cycle, while ensuring long‐term protection of human health and the environment and achieving public and regulatory acceptance. Parameters are considerations, impacts, or stressors of environmental, social, and economic importance. Because remediation project phases are not stand‐alone entities but interconnected components of the wider remediation system, the Framework provides a systematic, process‐based approach in which sustainability is integrated holistically and iteratively within the wider remediation system. By focusing stakeholders on the preferred end use or future use of a site at the beginning of a remediation project, the Framework helps stakeholders form a disciplined planning strategy. Specifically, the Framework is designed to help remediation practitioners (1) perform a tiered sustainability evaluation, (2) update the conceptual site model based on the results of the sustainability evaluation, (3) identify and implement sustainability impact measures, and (4) balance sustainability and other considerations during the remediation decision‐making process. The result is a process that encourages communication among different stakeholders and allows remediation practitioners to achieve regulatory goals and maximize the integration of sustainability parameters during the remediation process. © 2011 Wiley Periodicals, Inc. 相似文献
994.
Minakshi?Sultania Deepak?SrivastavaEmail author 《Journal of Polymers and the Environment》2011,19(4):950-956
Diglycidyl ether of bisphenol—A (DGEBA)—based epoxy resin was blended in the ratio of 3:1 (weight basis) with cycloaliphatic
epoxy (CAE) resin. The prepared blend sample was further blended with different weight percentages of carboxyl-terminated
butadiene acrylonitrile copolymer (CTBN) ranging between 0 and 25 wt% with an interval of 5 wt% and cured with stiochiometric
amounts of 4, 4’- diamino diphenyl sulphone (DDS) cure agent. Structural changes during blending were studied by Fourier-transform
infra-red (FTIR) spectroscopic analysis. The kinetic parameters, viz., order of decomposition reaction (n), activation energy (E), pre-exponential factor (Z) and rate decomposition constant (k), for the decomposition of the samples were calculated by applying Coats-Redfern equation over thermogravimetric (TG) data.
The degradation of each sample followed second-order degradation kinetics, which was calculated by Coats-Redfern equation
using best-fit analysis. This was further confirmed by linear regression analysis. The validity of data was checked by t-test
statistical analysis. Further, the blend sample had higher initial degradation temperature and activation energy than its
respective pure epoxy resin indicating that the CTBN acted as thermal stabilizer for epoxy resin which improved the thermal
stability. 相似文献
995.
M. Jawaid H. P. S. Abdul Khalil P. Noorunnisa Khanam A. Abu Bakar 《Journal of Polymers and the Environment》2011,19(1):106-109
In this research, hybrid composite materials were prepared from combination of oil palm Empty fruit bunches (EFB) fibre and
jute fibre as reinforcement, epoxy as polymer matrix. This study intended to investigate the effect of jute fiber hybridization
and different layering pattern on the physical properties of oil palm EFB-Epoxy composites. Water absorption and thickness
swelling test reveal that hybrid composite shows a moderate water absorption which is 11.20% for hybrid EFB/Jute/EFB composite
and 6.08% for hybrid Jute/EFB/Jute composite. The thickness swelling and water absorption of the hybrid composites slightly
increased as the layering pattern of hybrid composites changed. Hybrid composites are more water resistance and dimensional
stable compare to the pure EFB composites. This is attributed to the more hydrophilic nature of EFB composites. Hybridization
of oil palm EFB composites with jute fibres can improve the dimensional stability and density of pure EFB and Jute fibre reinforced
composites has higher density of 1.2 g/cm3 compared to all other composites. 相似文献
996.
Lilian D. Steckert William E. Furtado Gabriela T. Jerônimo Scheila A. Pereira Gabriel F. A. Jesus José Luiz P. Mouriño 《Journal of environmental science and health. Part. B》2019,54(4):237-246
Fish may bioaccumulate contaminants from the aquatic environment and extend them to the food chain provoking risks to human health. This study evaluated the microbiological parameters of the pond´s water and trace elements concentrations in samples of water, sediment, feed and muscle of farmed Nile tilapia used for human consumption in southern Brazil. A total of 240 fish were collected from 12 tilapia farms. Sediment, tank water and dry ration used in the animals' diet were collected for analysis. Analysis were performed by Energy Dispersion X-ray Fluorescence (EDXRF), Inductively Coupled Plasma Mass Spectrometer (ICP-MS), Induced Coupled Plasma Optical Emission Spectrometer (ICP-OES), and Atomic Absorption Spectrometer (AAS-VGA). In addition, the microbiological analysis of the water was carried out. The concentrations of Se, I, Fe, Cu and Zn in fish muscle were higher than the recommended by the Brazilian legislation, considering the advised daily intake for adults. The arsenic element had concentrations above the limit stipulated by the present Brazilian legislation, observed in all samples of muscle, sediment and tank water highlighting a possible environmental and fish contamination by the toxic element. Moreover, the arsenic concentration in the water presented a positive correlation (ρ?=?0.33) with arsenic in the muscle, suggesting that tilapia is a good environmental bioindicator, once they properly reflect the levels of arsenic in the water. It is suggested to perform an arsenic speciation for quantification of the inorganic form and accurate assessment of the degree of toxicity in the muscle samples and risks it can bring to human health. Regarding the other potentially toxic elements (Hg, Pb and Cd), and microbiological analysis of water it was verified that the consumption of the fish in question does not raise risks, since the values are within a quality benchmark established by law. The concentration of total and fecal coliforms in pond´s water in the facilities was in agreement with the microbiological indexes required by the legislation of CONAMA class II. Western region presented the lowest concentrations of fecal coliforms when compared to the other regions. There was no significant difference in the microbiological counts of total heterotrophic bacteria, Vibrio spp. and Pseudomonas spp. among the regions. 相似文献
997.
es Ruiz de Arcaute Celeste Ossana Natalia A. Pérez-Iglesias Juan Manuel Soloneski Sonia Larramendy Marcelo L. 《Environmental science and pollution research international》2019,26(20):20485-20498
Environmental Science and Pollution Research - Pesticides might increase the production of reactive oxygen species (ROS). Dicamba (DIC) and 2,4-dichlorophenoxyacetic acid (2,4-D) are auxinic... 相似文献
998.
Filgueiras Ana Virginia Gago Jesús Campillo Juan Antonio León Víctor Manuel 《Environmental science and pollution research international》2019,26(21):21264-21273
Environmental Science and Pollution Research - Microplastics (MPs) are widely recognised as a contaminant of emerging concern in the marine environment. This work provides original data of the... 相似文献
999.
Solimeno Alessandro Gómez-Serrano Cintia Acién Francisco Gabriel 《Environmental science and pollution research international》2019,26(25):25855-25868
Environmental Science and Pollution Research - A new set up of the integral mechanistic BIO_ALGAE model that describes the complex interactions in mixed algal-bacterial systems was developed to... 相似文献
1000.
Costa José Arnaldo S. Sarmento Victor H. V. Romão Luciane P. C. Paranhos Caio M. 《Environmental science and pollution research international》2019,26(25):25476-25490
Environmental Science and Pollution Research - The rice husk ash (RHA) was used as an alternative source of silica for the synthesis of the functionalized mesoporous material, which was used in the... 相似文献