全文获取类型
收费全文 | 738篇 |
免费 | 9篇 |
国内免费 | 23篇 |
专业分类
安全科学 | 35篇 |
废物处理 | 76篇 |
环保管理 | 68篇 |
综合类 | 51篇 |
基础理论 | 132篇 |
环境理论 | 1篇 |
污染及防治 | 246篇 |
评价与监测 | 120篇 |
社会与环境 | 36篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 11篇 |
2022年 | 92篇 |
2021年 | 72篇 |
2020年 | 16篇 |
2019年 | 30篇 |
2018年 | 37篇 |
2017年 | 44篇 |
2016年 | 48篇 |
2015年 | 33篇 |
2014年 | 41篇 |
2013年 | 96篇 |
2012年 | 40篇 |
2011年 | 50篇 |
2010年 | 23篇 |
2009年 | 33篇 |
2008年 | 17篇 |
2007年 | 17篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 9篇 |
2003年 | 7篇 |
2002年 | 4篇 |
2001年 | 2篇 |
1999年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 4篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1973年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有770条查询结果,搜索用时 15 毫秒
121.
Amini Hassan Haghighat Gholam Ali Yunesian Masud Nabizadeh Ramin Mahvi Amir Hossein Dehghani Mohammad Hadi Davani Rahim Aminian Abd-Rasool Shamsipour Mansour Hassanzadeh Naser Faramarzi Hossein Mesdaghinia Alireza 《Environmental geochemistry and health》2016,38(1):25-37
Environmental Geochemistry and Health - There is discrepancy about intervals of fluoride monitoring in groundwater resources by Iranian authorities. Spatial and temporal variability of fluoride in... 相似文献
122.
Reza?Parsa Morteza?KolahdoozanEmail author Mohammad?Reza?Alavi?Moghaddam 《Environmental Fluid Mechanics》2016,16(4):833-844
An experimental program was conducted to investigate vertical oil dispersion of surface oil spills under non-breaking regular waves. The variation in oil concentration caused by oil dispersion in a water column was studied to determine the vertical oil dispersion profile. The experiments were performed using different waves characteristics for different volumes of oil spill to evaluate the variation in oil concentration at three depths at two sampling stations. The correlations between oil concentration and the main parameters of wave characteristics, oil spill volume, sampling depth, and distance of sampling stations to spill location were assessed. The results revealed that the trend of variation in oil concentration versus wave steepness is linear. The results obtained from experimental measurements indicated that the oil concentrations at mid-depth were 44–77 % and the concentrations near the flume bed were 12–33 % of the concentration near the water surface. 相似文献
123.
Mudassar Khan Ashiq Mohammad Karam Ahad Athanasios Katsoyiannis Salman Akbar Malik Muhammad Abdullaha Azhar Rashid Mauro Fasola Alamdar Hussain Habib Bokhari Syed Ali Musstjab Akber Shah Eqani 《Environmental geochemistry and health》2014,36(3):375-384
We investigated selected chlorinated pollutants (β-HCH, γ-HCH, DDDs, DDEs, o,p′-DDT, p,p′-DDT, heptachlor, aldrin, dieldrin, and endrin) in the Lahore and the Sialkot districts of Pakistan, using eggs of cattle egret (Bubulcus ibis) collected during May and June 2007. The pollutant with highest level and frequency was ΣDDT, followed by β-HCH, γ-HCH, heptachlor, aldrin, dieldrin, and endrin in descending order. The concentration(s) were significantly higher in Sialkot heronry for all the pollutants (except p,p′-DDT) than in Lahore. The values for DDTs, β-HCH, γ-HCH, and heptachlor were significantly higher (p < 0.05) in the egg(s) than in sediment(s) and in the chicks’ diet, due to biomagnification. Among DDTs analogues, p,p′-DDD was the major contaminant with >60 % of total DDT burden, reflecting the widespread aged as well as recent use of DDT as well as anaerobic degradation (DDD/DDE > 1 in many cases) in the nearby paddy soils. In few samples, p,p′-DDT/(DDD + DDE) > 0.5 suggested the recent emission patterns from surrounding contaminated areas of demolished DDT units and obsolete pesticide stores. The higher levels of HCHs (i.e., β-HCH) in the samples collected from Sialkot indicate exposure from long-term agricultural use. Overall, concentrations of all studied POPs were less than the threshold levels known to affect reproduction. Nevertheless, total DDTs and/or HCHs burdens in some eggs contained concentrations of greater than what would educe adverse effects on birds. This is among few studies on OCPs exposure to avian species, which provide the evidence of Pakistan’s contribution toward the Global POPs emission. 相似文献
124.
Mohammad Mohammadi Mohammad Salehi J. N. K. Rao 《Environmental and Ecological Statistics》2014,21(2):351-371
Perez and Pontius (J Stat Comput Simul 76:755–764, 2006) introduced several bootstrap methods under adaptive cluster sampling using a Horvitz–Thompson type estimator. Using a simulation study, they showed that their proposed methods provide confidence intervals with highly understated coverage rates. In this article, we first show that their bootstrap methods provide biased bootstrap estimates. We then define two bootstrap methods, based on the method of Gross (Proceeding of the survey research methods section. American Statistical Association, Alexandria, VA, pp 181–184, 1980) and Bootstrap With Replacement, that provide unbiased bootstrap estimates of the population mean with bootstrap variances matching the corresponding unbiased variance estimator. Using a simulation study, we show that the bootstrap confidence intervals based on our proposed methods have better performance than those based on available bootstrap methods, in the sense of having coverage proportion closer to the nominal coverage level. We also compare the proposed intervals to empirical likelihood based intervals in small samples. 相似文献
125.
Gholamreza GHASEMZADEH Mahdiye MOMENPOUR Fakhriye OMIDI Mohammad R. HOSSEINI Monireh AHANI Abolfazl BARZEGARI 《Frontiers of Environmental Science & Engineering》2014,8(4):471-482
Nanotechnology has revolutionized plethora of scientific and technological fields; environmental safety is no exception. One of the most promising and well- developed environmental applications of nanotechnology has been in water remediation and treatment where different nanomaterials can help purify water through different mechanisms including adsorption of heavy metals and other pollutants, removal and inactivation of patho- gens and transformation of toxic materials into less toxic compounds. For this purpose, nanomaterials have been produced in different shapes, integrated into various composites and functionalized with active components. Nanomaterials have also been incorporated in nanostructured catalytic membranes which can in turn help enhance water treatment. In this article, we have provided a succinct review of the most common and popular nanomaterials (titania, carbon nanotubes (CNTs), zero-valent iron, dendrimers and silver nanomaterials) which are currently used in environmental remediation and particularly in water purification. The catalytic properties and functionalities of the mentioned materials have also been discussed. 相似文献
126.
Shadpour Mallakpour Fatemeh Zeraatpisheh Mohammad R. Sabzalian 《Journal of Polymers and the Environment》2012,20(1):117-123
In this paper we studied the synthesis of biodegradable optically active poly(ester-imide)s containing different amino acid
residues in the main chain. These pseudo-poly(amino acid)s were synthesized by polycondensation of N,N′-(pyromellitoyl)-bis-l-tyrosine dimethyl ester as a diphenolic monomer and two chiral trimellitic anhydride-derived diacid monomers containing s-valine and l-methionine. The direct polycondensation reaction of these diacids with aromatic diol was carried out in a system of tosyl
chloride (TsCl), pyridine (Py) and N,N′-dimethylformamide (DMF) as a condensing agent. The structures and morphology of these polymers were studied by FT-IR, 1H-NMR, powder X-ray diffraction, field emission scanning electron microscopy (FE-SEM), specific rotation, elemental and thermogravimetric
analysis (TGA) techniques. TGA profiles indicate that the resulting PEIs have a good thermal stability. Morphology probes
showed these polymers were noncrystalline and nanostructured polymers. The monomers and prepared polymers were buried under
the soil to study the sensitivity of the monomers and the obtained polymers to microbial degradation. The high microbial population
and prominent dehydrogenase activity in the soil containing polymers showed that the synthesized polymers are biologically
active and microbiologically biodegradable. Wheat seedling growth in the soil buried with synthetic polymers not only confirmed
non-toxicity of polymers but also showed possibility of phyto-remediation in polymer-contaminated soils. 相似文献
127.
Mohammad Fareed Manoj Kumar Pathak Vipin Bihari Mohana Krishna Reddy Mudiam Devendra Kumar Patel Neeraj Mathur 《毒物与环境化学》2013,95(10):1919-1928
The aim of this study was to examine the hematological and cholinesterase (ChE) activity levels of pesticide sprayers employed in mango plantations at Lucknow. Fifty-two sprayers from mango plantations who regularly spray mixtures of pesticides including organochlorines (OC), organophosphates (OP), and carbamates were included as exposed group. Twenty residents living close to mango plantations, but not involved in pesticide spraying were taken as controls. Pesticide residues for OC were analyzed in blood by gas chromatography with electron capture detector. There was a significant decrease in acetylcholinesterase and butyrylcholinesterase activities in pesticide sprayers (n?=?52) relative to the control group (n?=?20). A significant difference in the frequency distribution of hematological variations in red blood cell, white blood cell, monocytes, neutrophils, mean corpuscular volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, and platelet count was observed. Residues of OC pesticides including α-hexachlorocyclohexane (HCH) and total HCH were found to be significantly higher in the blood of sprayers compared to controls. Hematological variations were quantitatively more frequent among the sprayers with 5 years of pesticide exposure compared to the controls and to subjects with less than 5 years of exposure group. Hematological abnormalities in sprayers were correlated with pesticide exposure as evidenced by lower ChE activity as well as the presence of OC pesticides in blood. The poorly controlled use of pesticides in the plantation appeared to have produced sub-clinical intoxication in the sprayers and indicated the need for training and implementation of proper, safer hygiene practices. 相似文献
128.
A heteropolyacid Zr(IV) tungstate-based cation exchanger has been synthesized. An amorphous sample, prepared at pH 1.2 and having a Na+ ion exchange capacity of 0.92?meq?g?1, was selected for further studies. Its physicochemical properties were determined using Fourier transform infrared spectrometer, X-ray diffraction, thermogravimetric, and scanning electron studies. To understand the cation exchange behavior of the material, distribution coefficients (K d) for metal ions in various solvent systems were determined. Some important binary separations of metal ions, namely Mg2+–Bi3+, Cd2+–Bi3+, Fe3+–Bi3+, Th4+–Bi3+, and Fe3+–Zn2+, were achieved on such columns. The practical utility of these separations was demonstrated by separating Fe3+ and Zn2+ ions quantitatively in commercial pharmaceutical formulation. The cation exchanger has been successfully applied also for the treatment of industrial wastewater and a synthetic mixture. All the results suggests that Zr(IV) tungstate has excellent potential for the removal of metals from aqueous systems using packed columns of this material. 相似文献
129.
Ali Almasi Mehdi Omidi Mehdi Khodadadian Razieh Khamutian Mohammad Bagher Gholivand 《毒物与环境化学》2013,95(4):660-671
The biosorption potential of processed walnut shell for Pb(II) and Cd(II) ions from aqueous solutions was explored. The effects of pH, contact time, initial ion concentration, and amount of dried adsorbent were studied in batch experiments. The maximum adsorption was achieved within the pH range 4.0–6.0. The equilibrium data were well fitted by the Langmuir isotherm model. The maximum monolayer adsorption capacities were found to be 32?g?kg?1 and 11.6?g?kg?1 for Pb(II) and Cd(II) ions, respectively. Kinetic data were best described by the pseudo-second-order model. The structural features of the adsorbent were characterized by Fourier transform infrared spectroscopy, which confirmed the involvement of hydroxyl (–OH), carboxyl (–COO–), and carbonyl (C=O) groups in metal sorption. This readily available adsorbent is efficient in the uptake of Pb(II) and Cd(II) ions from an aqueous solution and could be used for the treatment of wastewater streams bearing these metal ions. 相似文献
130.
Adnan M. Massadeh Wail A. Hayajneh Abdullah Shorman Mohammad Y. Gharaibeh Moh'd Mohanad A. Al-Dabet 《毒物与环境化学》2013,95(7):1244-1255
A total of 200 Jordanian children were classified into two groups: 100 Fe replete and 100 Fe deficient with ages ranging between 3.0 and 12.0 years (6.9 ± 2.7 years). All participants were chosen according to proper selection criteria followed by the sample collection: the samples were analyzed for hemoglobin and red blood cells; ferritin, an immunoassays-based instrument; and levels of Pb, Cu, and Zn. There were no significant differences between genders regarding Fe-deficiency (p = 0.57 and χ2 = 0.33), with a significant association of younger individuals (3.0–9.1 years) with Fe-deficiency (p < 0.05 and χ2 = 22.7).In addition, there is a significant positive correlation between Fe-deficiency with blood levels of Pb, Cu, and Zn (p < 0.05), (r = 0.43, 0.35, and 0.42, respectively) as compared to control group, this findings supported, by comparing the levels of the examined metals in both groups, in individuals whom close to heavy metals source (highway traffic or oil gas station), and found that the mean of the heavy metals level in close Fe-deficient group higher than in close Fe-replete group. 相似文献