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排序方式: 共有107条查询结果,搜索用时 15 毫秒
61.
Assessment of anticipated performance index of some deciduous plant species under dust air pollution
Javanmard Zeinab Kouchaksaraei Masoud Tabari Hosseini Seyed Mohsen Pandey Ashutosh Kumar 《Environmental science and pollution research international》2020,27(31):38987-38994
Environmental Science and Pollution Research - Green vegetation improvement is an economical strategy to mitigate dust air pollution. The anticipated performance index (API) is considered a main... 相似文献
62.
Sadullah Mir Tariq Yasin Humaira Masood Siddiqi Ghulam Murtaza 《Journal of Polymers and the Environment》2017,25(4):1011-1020
In this study water soluble sodium carboxymethyl cellulose (CMC) was blended with high density polyethylene (HDPE) by peroxide-initiated melt compounding technique. The compatibility of the blended polymers were carried out by silane crosslinking agent. A series of blends were prepared by varying the CMC contents up to a maximum of 50 phr. The physical properties of non-crosslinked and crosslinked blends were investigated in detail. FTIR analysis of crosslinked blend confirmed the presence of Si–O–Si and Si–O–C absorption peaks at 1050 and 1159 cm?1. Thermal stability of crosslinked blends improved as compared to its non-crosslinked congener. Rheological study of crosslinked blends illustrated high complex viscosity and dynamic shear storage modulus. The tensile strength of virgin polyethylene was 8.1 MPa whereas the maximum tensile strength of 19.6 MPa was observed in crosslinked blend. Similarly lower deformation was observed in crosslinked blends under static load. Scanning electron microscopy of crosslinked formulations also showed strong adhesion between the polymers interface. The compatibility of HDPE and CMC is attributed to both free radical and condensation reactions. 相似文献
63.
Hosseini Beinabaj Seyyed Mahdi Bazargan Alireza Sanei Emad 《Journal of Material Cycles and Waste Management》2023,25(5):2835-2844
Journal of Material Cycles and Waste Management - The hydrolysis of organic waste in anaerobic digestion is slow and time-consuming. Pretreatment of the waste can potentially improve hydrolysis and... 相似文献
64.
Water level in aquifer plays the main role in groundwater modeling as one of the input data. In practice, due to aspects of
time and cost, data monitoring of water levels is conducted at a limited number of sites, and interpolation technique such
as kriging is widely used for estimation of this variable in unsampled sites. In this study, the efficiency of the ordinary
kriging (OK) and adaptive network-based fuzzy inference system (ANFIS) was investigated in interpolation of groundwater level in an unconfined aquifer in the north of Iran. The results showed
that ANFIS model is more efficient in estimating the groundwater level than OK. 相似文献
65.
66.
S. M. Hosseini S. Sobhanardakani M. Batebi Navaei M. Kariminasab S. M. Aghilinejad J. M. Regenstein 《Environmental science and pollution research international》2013,20(8):5839-5843
Caviar (fish roe of sturgeon) may contain high levels of contaminants. An inductively coupled plasma-optical emission spectrometer and a direct mercury analyzer were used to assess the contents of four heavy metals (Hg, Se, Sn, and Ba) in caviar of wild Persian sturgeon sea foods. The levels of Hg ranged from 1.39 to 1.50 μg?g?1, Se from 0.90 to 1.10 μg?g?1, Sn from 0.23 to 0.33, and Ba from 0.71 to 1.17 μg?g?1. Evaluation of these levels showed that except for Hg, the average concentrations of other metals are significantly lower than adverse level for the human consumption when compared with Food and Agricultural Organization of the United Nations and World Health Organization permissible limits. Therefore, their contribution to the total body burden of these heavy metals can be considered as negligibly small given that caviar is a luxury product. 相似文献
67.
Shahla Hosseini Bai Steven M. Ogbourne 《Environmental science and pollution research international》2016,23(19):18988-19001
Glyphosate has been the most widely used herbicide during the past three decades. The US Environmental Protection Agency (EPA) classifies glyphosate as ‘practically non-toxic and not an irritant’ under the acute toxicity classification system. This classification is based primarily on toxicity data and due to its unique mode of action via a biochemical pathway that only exists in a small number of organisms that utilise the shikimic acid pathway to produce amino acids, most of which are green plants. This classification is supported by the majority of scientific literature on the toxic effects of glyphosate. However, in 2005, the Food and Agriculture Organisation (FAO) reported that glyphosate and its major metabolite, aminomethylphosphonic acid (AMPA), are of potential toxicological concern, mainly as a result of accumulation of residues in the food chain. The FAO further states that the dietary risk of glyphosate and AMPA is unlikely if the maximum daily intake of 1 mg kg?1 body weight (bw) is not exceeded. Research has now established that glyphosate can persist in the environment, and therefore, assessments of the health risks associated with glyphosate are more complicated than suggested by acute toxicity data that relate primarily to accidental high-rate exposure. We have used recent literature to assess the possible risks associated with the presence of glyphosate residues in food and the environment. 相似文献
68.
Environment, Development and Sustainability - The outbreak of the novel coronavirus (COVID-19) forced the governing bodies across the world to ban all kinds of travel involving the movement of... 相似文献
69.
Selecting a binary Markov model for a precipitation process 总被引:1,自引:0,他引:1
This paper uses rth-order categorical Markov chains to model the probability of precipitation. Several stationary and non-stationary high-order
Markov models are proposed and compared using BIC. The number of parameters increases exponentially by adding the Markov order.
Several classes of high-order Markov models are proposed which their increase of number of parameters are modest. For example
models that use the number of precipitation days in a period prior to date, temperature of the previous day and sines/cosines
periodic functions (to model the seasonality) are considered. The theory of partial likelihood is used to estimate the parameters.
Parsimonious non-stationary first order Markov models with few seasonal terms are found optimal using BIC and temperature
does not turn out to be a useful covariate. However BIC seems to underestimate the number of seasonal terms. We have also
compared the results with AIC in some cases which tends to pick parsimonious models with more seasonal terms and higher order.
We also show that ignoring seasonal terms result in picking higher order Markov chains. Finally we apply the methods to build
confidence intervals for the probability of periods with no precipitation or low number of precipitation days in Calgary using
historical data from 1980 to 2000. 相似文献
70.
Ganie Showkat Ali Ali Akbar Mir Tariq Ahmad Mazumdar Nasreen 《Journal of Polymers and the Environment》2022,30(2):504-515
Journal of Polymers and the Environment - Niacin, an essential B-complex vitamin, used in the treatment of nonalcoholic fatty liver disease is the first perceived lipid regulating medication,... 相似文献