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Alireza Asghari,Bahram Mohammadi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
A green, novel and efficient solid phase extraction method based on the use of nano-alumina (nano-Al2O3) coated with sodium dodecyl sulfate (SDS) and modified with 4-(2-Pyridylazo) resorcinol (PAR) asa new adsorbent was developed for separation and preconcentration of trace amounts of Ni, Pb, Cu andZn ions prior to determination by inductively coupled plasma-optical emission spectrometry (ICP-OES). Under the optimum conditions (eluent: HNO3, 4.0 mL, 3.0 mol L-1; adsorbent: 0.8 g of nano-Al2O3,40 mg of SDS, 8.6 mg of PAR; and sample: pH 6, flow rate 2.0 mL min-1), adsorption capacity of nano-Al2O3-SDS-PAR, enrichment factors and limits of detection for the analytes were 8.7–12.9 mg g-1, 125–250, and 0.12–0.71 mg L-1, respectively. The proposed method presented excellent repeatability withrelative standard deviations less than 1.6% (n = 10), and calculated calibration curves gave good level oflinearity with correlation coefficient values between 0.989 and 0.999. Finally, the feasibility of themethod was evaluated by extraction and determination of Ni, Pb, Cu and Zn ions in rice seed, apple juice,coriander, lettuce and tap water samples.
Asghari-Rad, Peyman,Sathiyamoorthi, Praveen,Bae, Jae Wung,Moon, Jongun,Park, Jeong Min,Zargaran, Alireza,Kim, Hyoung Seop Elsevier 2019 Materials science & engineering. properties, micro Vol.744 No.-
<P><B>Abstract</B></P> <P>In the present study, V<SUB>10</SUB>Cr<SUB>15</SUB>Mn<SUB>5</SUB>Fe<SUB>35</SUB>Co<SUB>10</SUB>Ni<SUB>25</SUB> (at%) high-entropy alloy (HEA) of a single phase face-centered cubic structure with various grain sizes was fabricated. The influences of grain size on the work-hardening behavior and deformation mechanisms were investigated. The fine-grained and coarse-grained samples showed different work hardening behaviors during room temperature tensile deformation. Microstructural analysis revealed the presence of a high-density tangled dislocation structure without any mechanical twinning in the fine-grained sample, while mechanical twinning was observed to be the additional deformation mechanism in the coarse-grained sample.</P>
Modeling Geographical Anycasting Routing in Vehicular Networks
( Alireza Amirshahi ),( Morteza Romoozi ),( Mohammad Ali Raayatpanah ),( Seyyed Amir Asghari ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.4
Vehicular network is one of the most important subjects for researchers in recent years. Anycast routing protocols have many applications in vehicular ad hoc networks. The aim of an anycast protocol is sending packets to at least one of the receivers among candidate receivers. Studies done on anycast protocols over vehicular networks, however, have capability of implementation on some applications; they are partial, and application specific. No need to say that the lack of a comprehensive study, having a strong analytical background, is felt. Mathematical modeling in vehicular networks is difficult because the topology of these networks is dynamic. In this paper, it has been demonstrated that vehicular networks can be modeled based on time-expanded networks. The focus of this article is on geographical anycast. Three different scenarios were proposed including sending geographic anycast packet to exactly-one-destination, to at-least-one-destination, and to K-anycast destination, which can cover important applications of geographical anycast routing protocols. As the proposed model is of MILP type, a decentralized heuristic algorithm was presented. The evaluation process of this study includes the production of numerical results by Branch and Bound algorithm in general algebraic modeling system (GAMS) software and simulation of the proposed protocol in OMNET++ simulator. The comprehension of the result of proposed protocol and model shows that the applicability of this proposed protocol and its reactive conformity with the presented models based on presented metrics.
Ostadrahimi, Alireza,Ziaei, Jamal Eivazi,Esfahani, Ali,Jafarabadi, Mohammad Asghari,Movassaghpourakbari, Aliakbar,Farrin, Nazila Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.14
Background: Breast cancer is the most common female malignancy in the world. Beta glucan can be a hematopoietic and an immune modulator agent in cancer patients. The aim of this trial was to determine the effect of beta glucan on white blood cell counts and serum levels of IL-4 and IL-12 in women with breast cancer undergoing chemotherapy. Materials and Methods: This randomized double-blind placebo-controlled clinical trial was conducted on 30 women with breast carcinoma aged 28-65 years. The eligible participants were randomly assigned to intervention (n=15) or placebo (n=15) groups using a block randomization procedure with matching based on age, course of chemotherapy and menopause status. Patients in the intervention group received two 10-mg capsules of soluble 1-3, 1-6, D-beta glucan daily and the control group receiving placebo during 21 days, the interval between two courses of chemotherapy. White blood cells, neuthrophil, lymphocyte and monocyte counts as well as serum levels of IL-4 and IL-12 were measured at baseline and at the end of the study as primary outcomes of the study. Results: In both groups white blood cell counts decreased after 21 days of the intervention, however in the beta glucan group, WBC was less decreased non significantly than the placebo group. At the end of the study, the change in the serum level of IL-4 in the beta glucan group in comparison with the placebo group was statistically significant (p=0.001). The serum level of IL-12 in the beta glucan group statistically increased (p=0.03) and comparison between two groups at the end of the study was significant after adjusting for baseline values and covariates (p=0.007). Conclusions: The findings suggest that beta glucan can be useful as a complementary or adjuvant therapy and immunomodulary agent in breast cancer patients in combination with cancer therapies, but further studies are needed for confirmation.
Maryam Rajabi,Bahram Mohammadi,Alireza Asghari,Behruz Barfi,Mahdi Behzad 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A green and highly selective solid phase extraction was employed for simultaneous preconcentration and determination of lead and zinc ions in complex real samples by differential pulse anodic stripping voltammetry. The presented method is based on the adsorption of zinc and lead ions on SDS-coated nano-alumina modified with sodium salicylaldehyde-5-sulfonate (SAS). The influence of effective parameters on the separation and preconcentration of the analytes, such as amount of adsorbent, pH and flow rate of sample, volume and concentration of eluent, and effect of possible matrix ions was investigated. Under the best conditions (eluent: HNO3, 3.0 mL, 3.0 mol L-1; adsorbent: 0.7 g of nanoalumina, 30 mg of SDS, 9.4 mg of SAS; and sample: pH 5), adsorption capacity, enrichment factors, and limits of detection for metal ions were 7.8–8.5 mg g-1, 83–167 and 0.0046–0.026 mg L-1, respectively. Calibration graphs were linear in the range of 0.01–100 and 0.08–150 mg L-1 for Pb (II) and Zn (II), respectively. At the end, the proposed method was successfully applied for determination of the analytes in tap water and different food samples such as rice seed, apple juice, coriander and lettuce.
Zolfaghari, Mahdieh,Arab, Ali,Asghari, Alireza The Korean Electrochemical Society 2020 Journal of electrochemical science and technology Vol.11 No.3
Some nano structured bimetallic NiPd electrocatalysts were electrodeposited on glassy carbon electrodes using a double potential step chronoamperometry. The morphology of the electrodeposited samples was investigated by field emission-scanning electron microscopy, while their compositions were evaluated using energy dispersive X-ray spectroscopy. It was observed that the electrodeposited samples contained a low Ni content, in the range of 0.80 - 7.10%. The electrodeposited samples were employed as the anode electro-catalysts for the oxidation of sodium borohydride in NaOH solution (1.0 M) using cyclic voltammetry, chronoamperometry, rotating disk electrode, and impedance spectroscopy. The number of exchanged electrons, charge transfer resistances, apparent rate constants, and double layer capacitances were calculated for the oxidation of borohydride on the prepared catalysts. According to the results obtained, the NiPd-2 sample with the lowest Ni content (0.80%), presented the highest catalytic activity for borohydride oxidation compared with the other NiPd samples as well as the pure Pd sample. The anodic peak current density was obtained to be about 1.3 times higher on the NiPd-2 sample compared with that for the Pd sample.
Marjan Esmaelian,Farideh Nabizadeh Chianeh,Alireza Asghari 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
A novel Ti/nanoSnO2-MWCNT electrode was prepared by electrophoretic deposition method forciprofloxacin (CIP) treatment. The electrochemical characterization indicated that the electrochemicalactivity of Ti/nanoSnO2-MWCNT electrode was superior to the Ti/nanoSnO2 and Ti electrodes. To obtainmaximal CIP removal efficiency; pH, current density, electrolysis time and electrolyte concentration werechosen as independent variables in central composite design. Under the optimal conditions, the maximalvalues 89.61% and 86.30% were achieved for CIP and chemical oxygen demand removal efficiencies,respectively. Based on the results, the good electro-catalytic performance of Ti/nanoSnO2-MWCNTelectrode makes it low-cost and promising anode for electrochemical oxidation of drug pollutants.