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101.
Allam Nanis G. El-Sheekh Mostafa M. Sarhan Naglaa I. Alfakharany Ghada S. 《Environmental science and pollution research international》2021,28(2):1555-1564
Environmental Science and Pollution Research - Liver toxicity is affected by several factors, including certain medications, fumes emission from factories, materials used in industries, and... 相似文献
102.
Shafiey Dehaj Mohammad Ahmadi Mehdi Zamani Mohiabadi Mostafa 《Environmental science and pollution research international》2021,28(5):5316-5331
Environmental Science and Pollution Research - This research was designed to experimentally study the influence of using three metal oxide nanofluids at different high flow rates with various mass... 相似文献
103.
Y Kooch SM Hosseini C Zaccone H Jalilvand SM Hojjati 《Journal of environmental monitoring : JEM》2012,14(9):2438-2446
Following the ratification of the Kyoto Protocol, afforestation of formerly arable lands and/or degraded areas has been acknowledged as a land-use change contributing to the mitigation of increasing atmospheric CO(2) concentration in the atmosphere. In the present work, we study the soil organic carbon sequestration (SOCS) in 21 year old stands of maple (Acer velutinum Bioss.), oak (Quercus castaneifolia C.A. Mey.), and red pine (Pinus brutia Ten.) in the Darab Kola region, north of Iran. Soil samples were collected at four different depths (0-10, 10-20, 20-30, and 30-40 cm), and characterized with respect to bulk density, water content, electrical conductivity, pH, texture, lime content, total organic C, total N, and earthworm density and biomass. Data showed that afforested stands significantly affected soil characteristics, also raising SOCS phenomena, with values of 163.3, 120.6, and 102.1 Mg C ha(-1) for red pine, oak and maple stands, respectively, vs. 83.0 Mg C ha(-1) for the control region. Even if the dynamics of organic matter (OM) in soil is very complex and affected by several pedo-climatic factors, a stepwise regression method indicates that SOCS values in the studied area could be predicted using the following parameters, i.e., sand, clay, lime, and total N contents, and C/N ratio. In particular, although the chemical and physical stabilization capacity of organic C by soil is believed to be mainly governed by clay content, regression analysis showed a positive correlation between SOCS and sand (R = 0.86(**)), whereas a negative correlation with clay (R = -0.77(**)) was observed, thus suggesting that most of this organic C occurs as particulate OM instead of mineral-associated OM. Although the proposed models do not take into account possible changes due to natural and anthropogenic processes, they represent a simple way that could be used to evaluate and/or monitor the potential of each forest plantation in immobilizing organic C in soil (thus reducing atmospheric C concentration), as well as to select more appropriate species during forestation plan management at least in the north of Iran. 相似文献
104.
105.
106.
Khairy MA Kolb M Mostafa AR El-Fiky A Bahadir M 《Environmental science and pollution research international》2012,19(3):794-811
Introduction
In Egypt, the picture of threats to humans and the environment from the exposure to organic pollutants is still incomplete. Thus the objectives of this study were to assess the occurrence and distribution of polychlorinated biphenyls (PCBs), organochlorine pesticides, and chlorpyrifos in sediments and mussels of Abu Qir Bay and their risks for environment and human health. 相似文献107.
Mahla Hosseini Vardei Abdolrasoul Salmanmahiny Seyed Masoud Monavari Mir Masoud Kheirkhah Zarkesh 《Environmental monitoring and assessment》2014,186(11):7335-7347
Population growth, during the twentieth century, has increased demand for new farmlands. Accordingly, road networks have rapidly been developed to facilitate and accelerate human access to the essential resources resulted in extensive land use changes. The present study aims at assessing cumulative effects of developed road network on tree cover of Golestan Province in northern Iran. In order to detect changes over the study period of 1987–2002, the LULC map of the study area was initially prepared from the satellite images of Landsat TM (1987) and ETM+ (2002) using maximum likelihood supervised classification method. Afterwards, a total number of seven landscape matrices were selected to detect cumulative effects of the developed road network on woodland cover. The obtained results indicated that the fragile patches are mainly located at a distance of 171–342 m from the roadside. Furthermore, the majority of the patches affected by cumulative effects of development activities are situated at a distance of 342–684 m from the roadside, over an approximate area of 55 ha. The analysis of landscape metrics revealed that the developed road network has increased the landscape metrics of “the number of patches” and “patches perimeter-area ratio”. It has also followed by a decrease in metrics such as “patches area”, “Euclidean nearest neighbor distance”, “patches proximity”, “shape index”, “contiguity”, and “mean patches fractal dimension”. The road network has also increased the “number of patches” and decreased the “mean patches area” representing further fragmentation of the landscape. With identification of highly affected wooldland cover patches, it would be possible to apply adaptive environmental management strategies to preserve and rehabilitate high-priority patches. 相似文献
108.
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
109.
Imprinted polymer particles have been developed as a novel adsorbent for the adsorption of copper from aqueous solution. This
method has received much attention in various fields because of their high selectivity for template molecules. In this work,
separation of copper from water and biological samples by batch solid phase extraction based on molecular imprinting technique
is presented. Copper-imprinted polymer was prepared by free radical solution polymerization in a glass tube containing CuSO4, morin, 4-vinylpyridine as a functional monomer, ethyleneglycoldimethacrylate as a cross-linking monomer, 2,2′- azobisisobutyronitrile
as an initiator. The polymer block obtained was ground and sieved, and the Cu-morin complex was removed from polymer particles.
The synthesized polymer particles both prior to and after leaching have been characterized by IR and X-ray diffraction studies.
The effect of different parameters, such as pH, adsorption and desorption time, type and least amount of the eluent for elution
of the complex from polymer were evaluated. The limit of detection of the proposed method was 0.12 μg L−1. The method was applied to the recovery and determination of copper in water and biological real samples. 相似文献
110.
Abukhadra Mostafa R. Mostafa Merna Jumah May N. Bin Al‑Khalawi Nora Alruhaimi Reem Saleh Salama Yasser F. Allam Ahmed A. 《Journal of Polymers and the Environment》2022,30(10):4500-4500
Journal of Polymers and the Environment - 相似文献