排序方式: 共有146条查询结果,搜索用时 234 毫秒
91.
Iman Zarei Alireza Pourkhabbaz Reza Bashiri Khuzestani 《Environmental monitoring and assessment》2014,186(10):6047-6060
The aim of this study was to assess the pollution status of metals in sediments of Hara Biosphere Reserve using pollution indicators. For this purpose, sediment samples from nine locations were collected and characterized for metal content (Pb, Cr, Zn, Cu, and Fe) using the total digestion technique. Comparison of metal concentrations with that of sediment quality guidelines (SQGs) demonstrated no association with negative biological effects for Cu and Zn, while the values of Pb and Cr mainly illustrated to have association with negative biological effects. The results of the geo-accumulation index (I geo) indicated no contamination for Cr, Cu, Zn, and Fe, while the values of Pb demonstrated to have moderate contamination based on I geo values. The analysis of the enrichment factor (EF) showed no enrichment for Cu and Zn and minor enrichment for Pb and Cr. Similar results were also found for quantification of contamination (QoC) analysis, where the values of Cu and Zn demonstrated to have a geogenic source of contamination, while the values of Pb and Cr mainly illustrated to have an anthropogenic source of contamination. According to EF and QoC calculations, the values of Cu and Zn were derived mainly from natural processes and exposure of material from the earth’s crust, while the values for Pb and Cr were enriched by anthropogenic activities. The results of the contamination factor (C f i ) demonstrated low contamination levels for Fe, Cr, Zn, and Cu and moderate contamination levels for Pb. The pollution load index (PLI), showing the overall contamination of metals, demonstrated moderate pollution status in the study area. 相似文献
92.
From Iran: Does Improvement in Corporate Environmental Performance Affect Corporate Risk Taking?
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Superior corporate environmental performance (CEP) has become essential to the competitive advantage and financial success of businesses. However, the main reasons managers pay attention to environmental performance are improved reputation in the capital market and profitability, as well as reductions in operating costs and risks. This article describes the findings of a study that examines the relationship between CEP, using a reduction of carbon dioxide (CO2) emissions as a measure, and corporate risk taking. In addition to indicating a significant negative relationship between CEP and firm risk, the study results also show that a 1% improvement of CEP decreases corporate risk by 3%. 相似文献
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Alireza Khataee Mahdie Safarpour Behrouz Vahid Amaneh Akbarpour 《Environmental science and pollution research international》2014,21(14):8543-8554
In this paper, degradation of a mixture of three azo dyes was studied by the photo-assisted electrochemical process using an O2-diffusion cathode containing carbon nanotubes and boron-doped diamond (BDD) anode. The concentration of three textile dyes (C.I. Acid Orange 8 (AO8), C.I. Acid Orange 10 (AO10), and C.I. Acid Orange 12 (AO12)) was determined simultaneously despite the severe overlap of their spectra. For this purpose, partial least square (PLS), as a multivariate calibration method, was utilized based on recording UV–Vis spectra during the decolorization process. Moreover, the central composite design was used for the modeling of photo-assisted electrochemical decolorization of the aqueous solutions containing three dyes. The investigated parameters were the initial concentration of three dyes, applied current and reaction time. Analysis of variance (ANOVA) revealed that the obtained regression models match the experimental results well with R (Khataee et al. 2010, Clean-Soil Air Water 38 (1):96–103, 2010) of 0.972, 0.971, and 0.957 for AO8, AO10, and AO12, respectively. Three-dimensional surface and contour plots were applied to describe the relation between experimental conditions and the observed response. The results of TOC analysis confirmed good ability of proposed photo-assisted electrochemical process for degradation and mineralization of textile industry wastewater. 相似文献
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Mirsalari Seyyedeh Atefeh Nezamzadeh-Ejhieh Alireza 《Environmental science and pollution research international》2021,28(31):41651-41662
Environmental Science and Pollution Research - A ternary CdS/AgBr/Ag3PO4 coupled system was prepared, characterized by different techniques, and used for the photodegradation of methylene blue... 相似文献
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Kashani Homa Nakhjirgan Pegah Hassanvand Mohammad Sadegh Shamsipour Mansour Yunesian Masud Farzadfar Farshad Naddafi Kazem Mesdaghinia Alireza 《Environmental science and pollution research international》2021,28(3):2608-2625
Environmental Science and Pollution Research - Every year, almost eight million people die from tobacco-related diseases, among which around 1.2 million die from secondhand smoke (SHS) exposure.... 相似文献
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Mehdi Bidabadi Saeedreza Zadsirjan Seyed Alireza Mostafavi 《Journal of Loss Prevention in the Process Industries》2013,26(4):862-868
This study investigates the impact of radiation heat transfer and heat conduction on dust cloud combustion. Radiation plays a very important role in the stability of dust cloud flame, and increasing the amount of radiation drastically raises the possibility of instability and explosion in a dust cloud mixture. Flame speed, which is a function of mixture characteristics, can exhibit a fluctuating behavior. By using the discrete heat source method, it would be possible to study the transient propagation of dust flames. Thus, the propagation speed of flame can be obtained, and as time goes by, the transient speed of dust flame will reach its steady state value. By considering the radiation effect, better agreement is observed between the obtained results and experimental data. 相似文献
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Alireza Ashori Yahya Hamzeh Fatemeh Amani 《Journal of Polymers and the Environment》2011,19(1):297-300
This work investigates the potentials of lemon balm (Melissa officinalis L.) stalk (LBS), a massive waste part of medicinal plant, for pulp and papermaking by assessing its fiber characteristics
and chemical composition. In addition, LBS properties were compared with some important agro-residues such as bagasse stalk
(BS), cotton stalk (CS) and tobacco stalk (TS). There is no information about suitability of the LBS in the open literature.
Chemically, LBS fibers contain a relatively high percentage of alpha-cellulose (32.7%), but a low percentage of lignin (25%),
which benefits pulping and bleaching. The hemicelluloses in LBS are mainly glucose and xylose. Ash content was about 6%, superior
to the average value corresponding to woods, which makes pulping difficult. It was verified that the chemical compositions
of the studied agro-residues vary significantly. Morphologically, the LBS fibers are comparable to those of hardwoods. Rather
a significant amount of parenchyma cells was found in LBS. The TS has the highest average fiber length, while the LBS has
the least, and the lengths of BS and CS fibers fall in between. In general, based on the results of this study, some propositions
can be made about the possible applications of LBS as a non-wood renewable source of natural products for use in the production
of pulp and paper. 相似文献
100.
Esmaeildoost Fatemeh Shahrousvand Mohsen Goudarzi Alireza Bagherieh-Najjar Mohammad B. 《Journal of Polymers and the Environment》2022,30(10):4271-4286
Journal of Polymers and the Environment - Semi-interpenetrating networks (semi-IPNs) of Xanthan gum/poly (acrylic acid) containing Cloisite 15A were prepared via radical polymerization using a... 相似文献