全文获取类型
收费全文 | 764篇 |
免费 | 181篇 |
专业分类
安全科学 | 97篇 |
废物处理 | 70篇 |
环保管理 | 272篇 |
综合类 | 27篇 |
基础理论 | 321篇 |
污染及防治 | 93篇 |
评价与监测 | 7篇 |
社会与环境 | 2篇 |
灾害及防治 | 56篇 |
出版年
2022年 | 1篇 |
2021年 | 9篇 |
2020年 | 10篇 |
2019年 | 37篇 |
2018年 | 56篇 |
2017年 | 35篇 |
2016年 | 56篇 |
2015年 | 44篇 |
2014年 | 57篇 |
2013年 | 229篇 |
2012年 | 30篇 |
2011年 | 41篇 |
2010年 | 49篇 |
2009年 | 31篇 |
2008年 | 33篇 |
2007年 | 25篇 |
2006年 | 24篇 |
2005年 | 16篇 |
2004年 | 22篇 |
2003年 | 23篇 |
2002年 | 28篇 |
2001年 | 21篇 |
2000年 | 20篇 |
1999年 | 11篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1979年 | 2篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1965年 | 1篇 |
1933年 | 1篇 |
1925年 | 1篇 |
排序方式: 共有945条查询结果,搜索用时 15 毫秒
921.
This research work was performed to evaluate ozonation and granular activated carbon adsorption processes from the view‐point of controlling the formation of disinfection by products (DBPs). Both the humic acid and raw water were first preozonated and then adsorbed on the activated carbon to assess the potency for removal of total organic carbon (TOC) and DBPs. The disinfection by‐product including THMs and HAAs, in principle, can be successfully removed through a use of the ozonation and granular activated carbon (GAC) adsorption processes. However, in practice dealing with the raw water, it is necessary to introduce the pilot‐plant to obtain the design and operation guidelines for the water treatment plant through the ICA (Instrumentation Control and Automation) program in our future research work. 相似文献
922.
Trace analysis of airborne toluene diisocyanate (TDI) vapor was accomplished by measuring the derivative using gas chromatography with electron‐capture detector after collecting gas samples with a microimpinger containing 2 ml toluene, 1 μl pentafluorobenzyl alcohol, and 1 μl triethylamine. The sampling efficiency was determined to be 99.4% for short‐term exposure level of TDI and the 2,4‐ and 2,6‐isomers of TDI were well separated. The derivative was identified to be a new compound with a molecular weight of 570 by mass spectrometry in fast atomic bombardment mode and nuclear magnetic resonance spectrometry. This method is convenient and can be applied in the field where airborne TDI is in vapor form. 相似文献
923.
M. E. Alvarez Piñeiro M. A. Lage Yusty J. Simal Lozano S. T. Carril Gonzalez‐Barros 《毒物与环境化学》2013,95(1-4):31-36
PCB and PCT residues were measured in free‐living (FM) and cultivated mussels (CM) from ten sites in Galicia by gas chromatography with electron capture detector and capillary column. The level of PCB1260 and PCT5460 in FMs increases going from Muros‐Noya to Vigo estuarine bay. There was a trend of increase from north to south. 相似文献
924.
Butyltin compounds (BTs) and organochlorine residues (OCs) were determined in green mussel (Perna viridis L.) collected along the coastal waters of India in 1994 and 1995 to elucidate their contamination levels and distribution. BTs were detected in all of the mussel samples, ranging from 2 to 378 ng/g wet wt, which indicated that BTs are widely distributed, with elevated concentrations in intense boating areas. BTs concentrations in green mussels were lower than those reported for developed nations as well as developing countries such as Thailand. Concentrations of OCs were much lower than those of BTs. Among OCs examined, DDTs were found to be greatest, followed by HCHs, PCBs, CHLs and HCB. Considering the fact that the usage of tributyltin (TBT), DDTs and HCHs are not controlled in India, their contamination in the aquatic environment may increase unless regulatory measures are imposed. To our knowledge, this is a first report on the detection of BTs in Indian mussels. 相似文献
925.
A laboratory experiment was used to investigate the mobilization kinetics of heavy metals from the sediment of a contaminated river located in northern Taiwan with varied concentrations of NTA and EDTA. We found that there were two stages of desorption in the mobilization of heavy metals from the sediment. As the concentrations of NTA and EDTA ranged 0–3.9 x 10‐4M (0–100mg/l) and 0–2.7 x 10‐4M (0–100mg/l) respectively, the mobilization percentages of heavy metals were proportional to the logarithm values of the concentrations of NTA and EDTA. The physical meaning of the multiple first‐order reaction was significant for the actual condition, but occasionally, it had more errors for Cu and Zn in the initial phase. The two‐constant model was most appropriate for describing the rates of mobilization of Pb, Cu, Zn, and Cr. The agreement between the diffusion model and the experimental data was satisfactory for Pb, Cu, Zn, and Cr only in the initial 5 h. 相似文献
926.
The aim of the present study was to investigate the effect of several β‐adrenergic blockers and related compounds with respect to generation of reactive oxygen species, especially hydroxyl radicals. Measurements were done using a chemiluminescence technique and the Co(II)‐EDTA + H2O2 system as a source of active oxygen species. 相似文献
927.
Guor‐Cheng Fang Cheng‐Nan Chang Yuh‐Shen Wu Ding‐Guor Yang Chia‐Chium Chu 《毒物与环境化学》2013,95(3-4):341-355
Aerosol samples of particulate and chemical species for PM10 (particulate matter with aerodynamic diameters less than 10 μm) collected by Universal sampler were studied from June to August 1998 in the suburban area of central Taiwan. The ratios of PM2.5/PM2.5–10 displayed that the fine particles (particle size < 2.5 μm) are prevailing in the suburban site. Ion Chromatography was used to analyze for the water‐soluble ions: sulphate and nitrate in the Universal samples. Also, the collected samples were analyzed by atomic absorption spectrophotometry for the elemental analysis of Ca, Fe, Pb, Cu and Cr. The results indicated that the crustal elements (Ca and Fe) and resuspended matters were dominated in the coarse particulate mode while the anthropogenic elements (Cr, Pb, Cu) and sulphate components are mainly in the fine particle fraction. The results also showed that the sulphate and nitrate make the largest portion of the chemical species collected by Universal sampler (PMio). The concentrations of heavy metals in THU are generally high, owing to the higher motor vehicle and industrial density nearby. The degree of pollution from this source differs from day to day, depending on the motor vehicle density. 相似文献
928.
Quantitative structure‐activity relationships of hydrophobic organic chemicals were studied based on equations we established. Results showed that observed toxicity of hydrophobic organic chemicals were correlated to two physical‐chemical parameters: reaction equilibrium constant of target molecule‐organic chemical; octanol/water partition coefficient. Regression results showed that the molecular connectivity index of first‐order was an ideal parameter instead of the equilibrium constant. Good relationships between toxicity data and the two parameters were found for three aquatic organisms with a wide range of chemicals. 相似文献
929.
Jeng‐Hsiang Lin 《Disasters》2018,42(2):392-404
Flat earthquake premiums are ‘uniformly’ set for a variety of buildings in many countries, neglecting the fact that the risk of damage to buildings by earthquakes is based on a wide range of factors. How these factors influence the insurance premiums is worth being studied further. Proposed herein is a risk‐based approach to estimate the earthquake insurance rates of buildings. Examples of application of the approach to buildings located in Taipei city of Taiwan were examined. Then, the earthquake insurance rates for the buildings investigated were calculated and tabulated. To fulfil insurance rating, the buildings were classified into 15 model building types according to their construction materials and building height. Seismic design levels were also considered in insurance rating in response to the effect of seismic zone and construction years of buildings. This paper may be of interest to insurers, actuaries, and private and public sectors of insurance. 相似文献
930.
Importance of Accounting for Detection Heterogeneity When Estimating Abundance: the Case of French Wolves 总被引:1,自引:0,他引:1
SARAH CUBAYNES ROGER PRADEL RÉMI CHOQUET CHRISTOPHE DUCHAMP JEAN‐MICHEL GAILLARD JEAN‐DOMINIQUE LEBRETON ERIC MARBOUTIN CHRISTIAN MIQUEL ANNE‐MARIE REBOULET CAROLE POILLOT PIERRE TABERLET OLIVIER GIMENEZ 《Conservation biology》2010,24(2):621-626
Abstract: Assessing conservation strategies requires reliable estimates of abundance. Because detecting all individuals is most often impossible in free‐ranging populations, estimation procedures have to account for a <1 detection probability. Capture–recapture methods allow biologists to cope with this issue of detectability. Nevertheless, capture–recapture models for open populations are built on the assumption that all individuals share the same detection probability, although detection heterogeneity among individuals has led to underestimating abundance of closed populations. We developed multievent capture–recapture models for an open population and proposed an associated estimator of population size that both account for individual detection heterogeneity (IDH). We considered a two‐class mixture model with weakly and highly detectable individuals to account for IDH. In a noninvasive capture–recapture study of wolves we based on genotypes identified in feces and hairs, we found a large underestimation of population size (27% on average) occurred when IDH was ignored. 相似文献