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Performance of fluoride adsorption by snail shell in aqueous
Ghorban Asgari,AbdolMotaleb Seid Mohammadi,Jamal Mehralipour,Adel Ahmadzadeh
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Fluoride in low concentration is essential for human but in high concentration is very hazardous for human health. The efficacy of Snail Shell (SS) was investigated in this research work as an adsorbent for the elimination of fluoride from aqueous.Material and Methods: In this experimental study, the capability of SS to adsorb fluoride ions was conducted using a series of batch tests in a shaker-incubator instrument. For each batch run, 100 mL of solution containing a known initial concentration of Fluoride and with the preferred level of pH was shacked. The effects of selected parameters such as pH (3-11), reaction time (5–60 min) cyanide concentrations (5–10 mg/L) and the adsorbent dosage (0.25–2.5 g/L) were investigated on the removal fluoride as a target contaminate. Chemical composition SS were analyzed using a Philips model XL-30 scanning electron microscope (SEM) with energy-dispersive X-ray microanalysis (EDX). The concentration of Fluoride in solution before and after treatment was determined using the HACH method.Results: Analysis of the SS component using the EDX technique showed that the main part of it consisted of calcium and its other components were magnesium, aluminum and silicate. The experimental data showed that the maximum fluoride removal occurred at pH of 7, adsorbent dose (0.5 g/L) and 30 min contact time and 5 mg/lit initial concentration. The kinetic evaluation indicated that the pseudo-second-order kinetic had the best fit to the experimental results predicting a chemisorption process. The equilibrium adsorption of fluoride onto SS was well represented by the Langmuir equation.Conclusion: As a result, SS was revealed as a very efficient and low-cost adsorbent and a promising option for removing fluoride from industrial wastewaters.
Removal of cyanide by eggshell as low-cost adsorbent
Ghorban Asgari,AbdolMotaleb Seid Mohammadi,Amir Shabanlo,Jamal Mehr Ali Pour
Pajouhan Scientific Journal , 2013,
Abstract: Introduction: Cyanides as carbon-nitrogen radicals are very toxic compounds and highly harmful to humans and aquatic organisms. The efficacy of eggshells (ES) was investigated in this research work as an adsorbent for the elimination of cyanide from polluted streams.Material and Methods: In this experimental study, the capability of ES to adsorb cyanide ions was conducted using a series of batch tests in a shaker-incubator instrument. For each batch run, 100 mL of solution containing a known initial concentration of cyanide and with the preferred level of pH was shacked. The effects of selected parameters such as pH (3-11), reaction time (5–60 min) cyanide concentrations (50–150 mg/L) and the adsorbent dosage (0.25–2 g/L) were investigated on the removal cyanide as a target contaminate. Chemical composition ES were analyzed using a Philips model XL-30 scanning electron microscope (SEM) with energy-dispersive X-ray microanalysis (EDX). The specific surface and pore size distributions of ES were measured via Brunauer-Emmett-Teller (BET) isotherm and Barrett-Joyner-Halenda (BJH) methods using a Micrometrics particle size analyzer. The concentration of cyanide in solution before and after treatment was determined using the titrimetric method as described in the standard methods.Results: Analysis of the ES component using the EDX technique showed that the main part of it consisted of calcium and its other components were magnesium, iron, aluminum and silicate. The experimental data showed that the maximum cyanide removal occurred at pH of 11, adsorbent dose (0.5 g/L ) and 40 min contact time. The kinetic evaluation indicated that the pseudo-second-order kinetic had the best fit to the experimental results predicting a chemisorption process. The equilibrium adsorption of cyanide onto ES was well represented by the Langmuir equation.Conclusion: As a result, ES as waste materials was revealed as a very efficient and low-cost adsorbent and a promising option for removing cyanide from industrial wastewaters.
Toeplitz graph decomposition
Samira Hossein Ghorban
Transactions on Combinatorics , 2012,
Abstract: Let $n,t_1,...,t_k$ be distinct positive integers. A Toeplitz graph $G=(V, E)$ denoted by $T_n$ is a graph, where $V ={1,...,n}$ and $E= {(i,j) : |i-j| in {t_1,...,t_k}}$.In this paper, we present some results on decomposition of Toeplitz graphs.
The Relationship between Students’ Conceptions of Learning and Their Academic Achievement  [PDF]
Ghorban Hemati Alamdarloo, Shahram Moradi, Gholam Reza Dehshiri
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.41006
Abstract:

This study investigates the relationship between pre-university students’ conceptions of learning with their academic achievement. The sample consisted of 309 students (165 males and 144 females) in Tehran city. Among them, 104 individuals were in Mathematics, 110 in Experimental Science, and 95 in Literature (Humanities). The participants were selected through multistage cluster sampling. To assess their conceptions of learning, Purdie and Hattie’s (2002) questionnaire was used, and to measure their academic achievement, the total mean of high school diploma was considered. The results showed a significant relationship between students’ conceptions of learning and their academic achievement. There is also a meaningful relationship between students’ number of conceptions of learning and their academic achievement.

Many-body effects in low dimensional electron liquids
R. Asgari
Iranian Journal of Physics Research , 2008,
Abstract: This review article is about the role of electron-electron interactions in low dimensional systems and its transport properties in nano-structures. It begins with a review of the pair-distribution function theory of electron liquid systems taking into account the electron-electron interactions. We extend the theory for highly correlated system such two- and one-dimensional electron liquids. We then review the microscopic theory of the local-field factors and calculate the quasiparticle properties in two-dimension electron liquid and compare our results with those measured by recent experiments. The physics of two-dimension bilayer structures are revised and are immediately applied to the study of charged Coulomb drag effects in a bilayer electron-electron system and results are compared with experimental data. As a final application, the Luttinger theory is discussed and we compare our recent calculations with those obtained from quantum Monte Carlo simulation for one dimensional electron liquid.
The Compatibility of Cultural Value in Iranian EFL Textbooks
Azadeh Asgari
Journal of Language Teaching and Research , 2011, DOI: 10.4304/jltr.2.4.887-894
Abstract: One of the major issues in critical linguistics and language education is analyzing the ideological content of textbooks. The dialectical connection between language and culture has always been a concern of L2 teachers and educators. Therefore, in this paper, the researcher has looked for the cultural values depicted in EFL books and tried to find their influence on Iranian learners as well as, the differences between cultural and language among learners and assesses the relative importance of language. In this study, one set of textbooks -interchange series- that are taught in English language institute in Iran are analyzed. The cultural values portrayed in these books were extracted, defined and exemplified in this paper. This study depicts that new interchange series do contain cultural values. However, shows that cultural impact does not occur through one book only. On the other word, the results found by the researcher indicated that these cultural values did not influence learners studying these books differently from those who study English through another set of books.
Role of MicroRNAs in Insect Host–Microorganism Interactions
Sassan Asgari
Frontiers in Physiology , 2011, DOI: 10.3389/fphys.2011.00048
Abstract: MicroRNAs (miRNAs) have appeared as important regulators of various biological processes including development, cancer, immunity, and host–microorganism interactions. Accumulating evidence demonstrates the differential expression of host miRNAs upon infection by various microorganisms and the involvement of microorganism-encoded miRNAs in host manipulation. Some of these alterations could be part of a host response to an infection to limit replication and dissemination of the microorganism or, conversely, due to manipulation of the host miRNA pathway by the microorganism to facilitate its replication. Insights into the role of miRNAs in host defense responses and host manipulation by microorganisms will enable a better understanding of host–microorganism interactions.
Elastic free-energy of wormlike micellar chains: theory and suggested experiments
Meisam Asgari
Physics , 2015,
Abstract: The extensive application of surfactants motivates comprehensive and predictive theoretical studies that improve our understanding of the behaviour of these complex systems. In this study, an expression for the elastic free-energy density of a wormlike micellar chain is derived taking into account interactions between its constituent molecules. The resulting expression incorporates the sum of a quadratic term in the curvature and a quadratic term in the torsion of the centerline of wormlike micelle and thus resembles free-energy density functions for polymer chains and DNA available in the literature. The derived model is applied on a wormlike micelle in the shape of a circular arc, open or closed. A detailed application of the derived model on wormlike micelles of toroidal shape, along with employing necessary statistical-thermodynamical concepts of self-assembly, is performed, and the results are found to be consistent with the ones available in the literature. Steps towards obtaining the material parameters through experiments are suggested and discussed.
Ground-state properties of the one dimensional electron liquid
R. Asgari
Physics , 2007, DOI: 10.1016/j.ssc.2006.12.018
Abstract: We present a theory of the pair distribution function $g(z)$ and many-body effective electron-electron interaction for one dimensional (1D) electron liquid. Our approach involves the solution of a zero-energy scattering Schr\"odinger equation for $\sqrt{g(z)}$ where we implemented the Fermi hypernetted-chain approximation including the elementary diagrams corrections. We present numerical results for $g(z)$ and the static structure factor $S(k)$ and obtain good agreement with data from diffusion Monte Carlo studies of the 1D system. We calculate the correlation energy and charge excitation spectrum over an extensive range of electron density. Furthermore, we obtain the static correlations in good qualitative agreement with those calculated for the Luttinger liquid model with long-range interactions.
Agronomic and Quality Characteristics of High-Yielding Rice Lines
Ghorban Ali Nematzadeh,Ghaffar Kiani
Pakistan Journal of Biological Sciences , 2007,
Abstract: This study is a part of rice cultivar development program in north of Iran with the aim of yield potential increase and attention to eating quality. Thirteen lines developed from the crosses between high yielding cultivars with aromatic low yield ones based on pedigree breeding method. These lines along with two controls (Neda and Sang-e-Tarom) were evaluated for agronomic and quality traits in a randomized complete block design during 2005. Farm and laboratory tests showed that lines 33-DN-1, 33-DN-18 and 32-DN-6 were superior in yield (more than 5.5 t ha-1) and had suitable eating quality in comparison with Sang-e-tarom as a local control.
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