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- 저자 : M. Salehi (검색결과 27 건)
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Performance of CNT-CNP aerogel as electrode in capacitive deionization system
Tabrizi N. Salman,Taleghani M. Salehi 한국탄소학회 2023 Carbon Letters Vol.33 No.4
In this study, hybrid aerogels containing carbon nanoparticles (CNP) and multi-walled carbon nanotubes (MWCNT) were synthesized via sol–gel method using resorcinol/formaldehyde precursors through a hydrolysis-condensation reaction mechanism. Porous carbonaceous structures were achieved by freeze-drying of the organic gels followed by controlled carbonization under an inert gas. The samples were characterized by various techniques such as FTIR, BJH, FESEM, CV, and EIS. The specific surface area and total pore volume of the aerogel sample were measured to be as high as 452 m2/g and 0.782 cm3/g, respectively, thus enhancing the electric double-layer formation. Electrochemical tests on the samples showed a large specific capacitance (212 F/g) and an excellent cyclic stability over 3000 cycles. Performance of the synthesized structures was subsequently assessed as electrodes in a capacitive deionization (CDI) process. At the operating conditions of 1.6 V voltage, flow rate of 20 mL/min, and NaCl concentration of 1000 mg/L a promising adsorption capacity around 42.08 mg/g was achieved.
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M. Rezaiee-Pajand,M. Ghalishooyan,M. Salehi-Ahmadabad 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.6
This paper consists of two parts, which broadly examines solution techniques abilities for the structures with geometrical nonlinear behavior. In part I of the article, formulations of several well-known approaches will be presented. These solution strategies include different groups, such as: residual load minimization, normal plane, updated normal plane, cylindrical arc length, work control, residual displacement minimization, generalized displacement control, modified normal flow, and three-parameter ellipsoidal, hyperbolic, and polynomial schemes. For better understanding and easier application of the solution techniques, a consistent mathematical notation is employed in all formulations for correction and predictor steps. Moreover, other features of these approaches and their algorithms will be investigated. Common methods of determining the amount and sign of load factor increment in the predictor step and choosing the correct root in predictor and corrector step will be reviewed. The way that these features are determined is very important for tracing of the structural equilibrium path. In the second part of article, robustness and efficiency of the solution schemes will be comprehensively evaluated by performing numerical analyses.
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M. Salehi,A. Salem 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.2
The influence of sintering conditions on the reliability of a special ceramic packing namely a Raschig ring, was investigated. The special kaolin used in the industrial ceramic Raschig rings manufacturing process was shaped by an extrusion method and sintered at 1200 and 1250oC using different soaking times, ranging from 30 to 180 minutes. The physico-chemical properties of specimens such as shrinkage, water absorption, bulk density, porosity, microstructure and mineralogical composition, were studied. According to the obtained results, the best sintering conditions were determined. The diametrical compressive strength of fired samples was measured on suitable specimens. The differences found in the strength data were evaluated using Weibull theory. The statistical results show that the maximum Weibull modulus is obtained when ceramic Raschig rings are fired at a lower sintering temperature and longer soaking time to reach the minimum total porosity. However, the soaking time needs to be optimized to realize the maximum strength and reliability during the fabricating process at a given temperature. The influence of sintering conditions on the reliability of a special ceramic packing namely a Raschig ring, was investigated. The special kaolin used in the industrial ceramic Raschig rings manufacturing process was shaped by an extrusion method and sintered at 1200 and 1250oC using different soaking times, ranging from 30 to 180 minutes. The physico-chemical properties of specimens such as shrinkage, water absorption, bulk density, porosity, microstructure and mineralogical composition, were studied. According to the obtained results, the best sintering conditions were determined. The diametrical compressive strength of fired samples was measured on suitable specimens. The differences found in the strength data were evaluated using Weibull theory. The statistical results show that the maximum Weibull modulus is obtained when ceramic Raschig rings are fired at a lower sintering temperature and longer soaking time to reach the minimum total porosity. However, the soaking time needs to be optimized to realize the maximum strength and reliability during the fabricating process at a given temperature.
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An Upper Bound Solution for Twist Extrusion Process
M. Seyed Salehi,N. Anjabin,김형섭 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.5
Twist extrusion, a promising severe plastic deformation technique for grain refinement down to ultrafine/nanocrystalline microstructures, was introduced as an attempt to provide large plastic deformation conditionssimilar to those in high pressure torsion while allowing large workpiece dimensions for industrialapplications. As a relatively new severe plastic deformation technique, twist extrusion requires in-depthinvestigation of its plastic deformation characteristics. In this study, the twist extrusion process with asquare shape die cavity has been analyzed using an upper bound solution to estimate the required power,deformation pattern, and optimum process condition. The analysis has been performed based on two kinematicallyadmissible velocity fields while the effects of friction condition, die geometry, and mean equivalentstrain have been considered. The results indicate that the die geometry and process parameters candramatically change the deformation pattern and extrusion power.
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M. Rezaiee-Pajand,M. Ghalishooyan,M. Salehi-Ahmadabad 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.6
In part I of the article, formulation and characteristics of the several well-known structural geometrical nonlinear solution techniques were studied. In the present paper, the efficiencies and capabilities of residual load minimization, normal plane, updated normal plane, cylindrical arc length, work control, residual displacement minimization, generalized displacement control and modified normal flow will be evaluated. To achieve this goal, a comprehensive comparison of these solution methods will be performed. Due to limit page of the article, only the findings of 17 numerical problems, including 2-D and 3-D trusses, 2-D and 3-D frames, and shells, will be presented. Performance of the solution strategies will be considered by doing more than 12500 nonlinear analyses, and conclusions will be drawn based on the outcomes. Most of the mentioned structures have complex nonlinear behavior, including load limit and snap-back points. In this investigation, criteria like number of diverged and complete analyses, the ability of passing load limit and snap-back points, the total number of steps and analysis iterations, the analysis running time and divergence points will be examined. Numerical properties of each problem, like, maximum allowed iteration, divergence tolerance, maximum and minimum size of the load factor, load increment changes and the target point will be selected in such a way that comparison result to be highly reliable. Following this, capabilities and deficiencies of each solution technique will be surveyed in comparison with the other ones, and superior solution schemes will be introduced.
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Maximun Flow in Self-Similar Flow Networks
H. Salehi Fathabadi,M. Toloo 한국경영과학회 2002 Management Science and Financial Engineering Vol.8 No.1
Special structure of flow networks can reduce the order of the relative existent algorithms. In this paper a special structure of flow network called self-similar flow networks is introduced. After describing such networks an efficient algorithm for finding maximum flow is presented. It is shown that this algorithm runs in O(m) time.<br/> <br/>
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Polymorphism of Bovine Lymphocyte Antigen DRB3.2 Alleles in Iranian Native Sarabi Cows
Pashmi, M.,Ghorashi, S.A.,Salehi, A.R.,Moini, M.,Javanmard, A.,Qanbari, S.,Yadranji-Aghdam, S. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.6
Sarabi cows (n = 136) from the Sarabi Breeding Station were genotyped at bovine lymphocyte antigen (BoLA)-DRB3.2 locus by a genotyping system that used the polymerase chain reaction and restriction fragment length polymorphism. Genomic DNA was extracted from whole blood samples. A two-step polymerase chain reaction was carried out in order to amplify a 284 base-pair fragment of target gene. Nested-PCR products were digested with three restriction endonuclease enzymes RsaI, BstYI and HaeIII. Digested fragments were analyzed by polyacrylamide gel electrophoresis. Twenty-six BoLA-DRB3.2 alleles were identified with frequencies ranging from 0.4 to 15.1%. Six new allele types observed in this study have not been reported previously. Identified alleles include: BoLA-DRB3.$2^*1$, $^*2$, $^*4$, $^*6$, $^*8$, $^*12$, $^*13$, $^*14$, $^*15$, $^*16$, $^*17$, $^*23$, $^*24$, $^*25$, $^*28$, $^*32$, $^*34$, $^*35$, $^*36$, $^*37$, $^*42$, $^*46$, $^*51$, $^*kba$, $^*laa$ and $^*vaa$. Their frequencies were found to be 0.4, 0.4, 0.7, 11.4, 1.1, 1.8, 2.9, 2.2, 4.4, 9.6, 1.1, 13.6, 0.4, 0.4, 1.1, 0.7, 0.4, 6.2, 2.2, 3.7, 1.1, 7.7, 1.5, 15.1, 2.6 and 7.3% respectively. The six most frequent alleles (DRB3.2 $^*6$, $^*16$, $^*23$, $^*46$, $^*kba$ and $^*vaa$) accounted for 64.7% of the alleles in the population of this herd. Numerous studies on this locus, covering different breeds, has revealed the existence of various alleles in this locus, and new investigations have introduced novel alleles. With respect to the high number of the observed alleles in this survey and the novelty of some alleles with no previous record of reporting, it is plausible to conclude that the BoLA-DRB3.2 locus is highly polymorphic in Iranian native Sarabi cows.
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