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Oxidative Desulfurization of Non-hydrotreated Kerosene Using Hydrogen Peroxide and Acetic Acid

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Chinese Journal of Chemical Engineering 2009年第5期17卷 869-874页

作者： asghar molaei dehkordi Mohammad Amin Sobati Mohammad Ali Nazem Department of Chemical and Petroleum Engineering Sharif University of Technology Tehran Iran

The oxidative desulfurization of a real refinery feedstock (i.e.,non-hydrotreated kerosene with total sulfur mass content of 0.16%) with a mixture of hydrogen peroxide and acetic acid was *** influences of various operating parameters including reaction temperature (T),acid to sulfur molar ratio (nacid/nS),and oxidant to sulfur molar ratio (nO/nS) on the sulfur removal of kerosene were *** results revealed that an increase in the reaction temperature (T) and nacid/nS enhances the sulfur ***,there is an optimum nO/nS related to the reaction temperature and the best sulfur removal could be obtained at nO/nS=8 and 23 for the reaction temperatures of 25 and 60°C,*** maximum observed sulfur removal in the present oxidative desulfurization system was 83.3%.

关键词： oxidative desulfurization kerosene hydrogen peroxide acetic acid oxidation extraction

Deletion of Salmonella enterica serovar typhimurium sipC gene

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Asian Pacific Journal of Tropical Biomedicine 2015年第12期5卷 987-991页

作者： Maryam Safarpour dehkordi Abbas Doosti asghar Arshi Biotechnology Research Center Islamic Azad University Shahrekord Branch

Objective:To construct a novel plasmid as Salmonella enterica serovar typhimurium(***)sip C gene knockouts ***:In this research,50upstream and 30downstream regions of *** sip C gene and kanamycin gene were PCR *** of these DNA fragment was cloned into p GEM T-easy *** construct was confirmed by PCR and restriction ***:PCR amplified 320,206 and 835 bp DNA fragments were subcloned into p ET-32 vector resulting with a plasmid called p ET-32-sip C up-kan-sip C ***:The new plasmid(p ET-32-sip C up-kan-sip C down)is useful for genetic engineering and for future manipulation of *** sip C gene.

关键词： Salmonella enterica serovar typhimurium sip C gene

Authenticated Key Agreement Protocol

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China Communications 2010年第5期7卷 1-8页

作者： Massoud Hadian dehkordi Reza Alimoradi Department of Mathematical Sciences Iran University of Science and Technology Narmak Tehran Iran Research Center of Intelligent Signal Processing Tehran Iran

Key agreement and identification protocols are much applicable among current protocols in cryptography. These protocols are used for a secure communication through an insecure channel in a network like Internet. Challenge-response identification protocol is an important identification method. In this paper, by making some slight changes in the public-key-based challenge-response identification protocol, we have introduced a new scheme in which the users in addition to authenticating each other can also agree on multiple keys. Then, this protocol＇s security from both aspects regarding the identification and key agreement will be analyzed. At the end, we will prove our scheme has a high security and efficiency in comparison with some famous and similar protocols.

关键词： identification multiple key agreement pairing challenge-response strong security

IMPACT EVALUATION OF HAIZUKA DAM ON ITS UP STREAM A CASE STUDY IN HIROSHIMA PREFECTURE, JAPAN

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Chinese Geographical Science 2004年第4期14卷 350-354页

作者： Forood AZARI dehkordi Nobukazu NAKAGOSHI Graduate School for International Development and Cooperation Hiroshima UniversityHigashi Hiroshima 739-8529 JapanGraduate School for International Development and Cooperation Hiroshima UniversityHigashi Hiroshima 739-8529 Japan

Japan ranks fifth in the world for the number of large dams. Environmental impacts of large dams are known, such as enormous losses of water or disruption of fish spawning, however, impacts of the dams on their up streams are functions of topography of the up stream. Haizuka Dam is located in Hiroshima Prefecture, Japan and its implementation will start in 2006. This large dam influences its up stream through dam making activities, which occurs in order and with different spatial presences that were categorized into chronological and spatial impacts. In this case study, spatial impacts were further divided into horizontal and vertical ones. The horizontal impacts were identified as new roads, diversion tunnel, dam lake, and submerged cultivated land, while vertical impacts were recognized as submerged historical monuments, slope protections, dam body, and deforested area in the reservoir. There were convergences of spatial and temporal impacts, however, the extent of the impacts was limited to the lake boundary.

关键词： dam impact up stream Haizuka Dam Japan

NUMERICAL SIMULATION OF FLOW OVER TWO CIRCULAR CYLINDERS IN TANDEM ARRANGEMENT

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Journal of Hydrodynamics 2011年第1期23卷 114-126页

作者： dehkordi Behzad Ghadiri MOGHADDAM Hesam Sarvghad JAFARI Hamed Houri Department of Mechanical Engineering School of EngineeringTarbiat Modares University

In this article,the 2-D unsteady viscous flow around two circular cylinders in a tandem arrangement is numerically simulated in order to study the characteristics of the flow in both laminar and turbulent *** method applied alternatively is based on the finite volume method on a Cartesian-staggered *** great source term technique is employed to identify the cylinders placed in the flow *** apply the boundary conditions,the ghost-cell technique is *** implemented computational method is firstly validated through simulation of laminar and turbulent flows around a fixed circular ***,the flow around two circular cylinders in a tandem arrangement is simulated and *** flow visualization parameters,the Strouhal numbers,and drag and lift coefficients are comprehensively presented and compared for different cases in order to reveal the effect of the Reynolds number and gap spacing on the behavior of the *** obtained results have shown two completely distinct flow characteristics in laminar and turbulent regimes.

关键词： circular cylinders tandem arrangement vortex shedding hydrodynamic forces

A novel and efficient multiparty quantum secret sharing scheme using entangled states

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1828-1831页

作者： MASSOUD Hadian dehkordi ELHAM Fattahi School of Mathematics Iran University of Science and TechnologyTehran ***Iran

We proposed a novel and efficient multiparty quantum secret sharing scheme using entangled state which in that the number of parties can be arbitrary *** state which we used,has special properties that make our scheme simple and *** operations which are needed to recover secret message,are only exclusive-or addition and complement *** it is shown that this scheme is secure against *** this scheme provides the best quantum bit efficiency compared with some famous quantum secret sharing schemes.

关键词： quantum secret sharing entangled state multiparty quantum cryptography

Numerical solutions of two-dimensional nonlinear integral equations via Laguerre Wavelet method with convergence analysis

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Applied Mathematics(A Journal of Chinese Universities) 2021年第1期36卷 83-98页

作者： K.Maleknejad M.Soleiman dehkordi School of Mathematics Iran University of Science and TechnologyNarmakTehran 16844Iran.

In this paper,the approximate solutions for two different type of two-dimensional nonlinear integral equations:two-dimensional nonlinear Volterra-Fredholm integral equations and the nonlinear mixed Volterra-Fredholm integral equations are obtained using the Laguerre wavelet *** do this,these two-dimensional nonlinear integral equations are transformed into a system of nonlinear algebraic equations in matrix *** solving these systems,unknown coefficients are ***,some theorems are proved for convergence *** numerical examples are presented and results are compared with the analytical solution to demonstrate the validity and applicability of the proposed method.

关键词： he two-dimensional nonlinear integral equations the nonlinear mixed Volterra-Fredholm inte-gral equations two-dimensional Laguerre wavelet Orthogonal polynomial convergence analysis the Darboux problem.

Novel in silico EST-SSR markers and bioinformatic approaches to detect genetic variation among peach(Prunus persica L.)germplasm

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Journal of Forestry Research 2020年第4期31卷 1359-1370页

作者： Mehrana Koohi dehkordi Tayebeh Beigzadeh Karim Sorkheh Department of Agronomy Faculty of AgriculturePayame-Noor UniversityP.O.Box 19395-3697TehranIran Department of Agronomy and Plant Breeding Faculty of AgricultureShahid Chamran University of AhvazP.O.Box 61355/144AhvazIran

Because there are thousands of peach cultivars,cultivar classification is a critical step before starting a breeding *** molecular markers such as simple sequence repeats(SSRs)can be *** this study,67 polymorphic primers produced 302 *** values for SI index(1.903)suggested higher genetic variability in the genotype under *** values for observed alleles(Na),expected heterozygosity(He),effective alleles(Ne),Nei’s information index(h),and polymorphic information content(PIC)were 4.5,0.83,5.45,0.83,and 0.81,*** dendrogram constructed based on Jaccard’s similarity coefficients outlined four distinct clusters in the entire *** addition,an analysis of molecular variance(AMOVA)showed that70.68%of the total variation was due to within-population variation,while 29.32%was due to variation among *** to this research,all primers were successfully used for the peach *** EST-SSR markers should be useful in peach breeding programs and other research.

关键词： Expressed sequenced tags(EST) Simple sequence repeats(SSR) Prunus persica L. Genetic diversityl

SEFIDROOD RIVER SUB-WATERSHED-DAM-ESTUARY AND DEGRADATION MODEL:A HOLISTIC APPROACH IN IRAN

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Chinese Geographical Science 2003年第4期13卷 328-333页

作者： Forood AZARI dehkordi Majid F MAKHDOUM Nobukazu NAKAGOSHI Graduate School for International Development and Cooperation Hiroshima University Higashi Hiroshima739-8529JapanGraduate School for International Development and CooperationHiroshima University Higashi Hiroshima739-8529JapanGraduate School for International Development and CooperationHiroshima University Higashi Hiroshima739-8529Japan

The major concern of this article is to address the shortcoming and outgoing effects of the human activities on the landscape patterns and their consequences in the Sefidrood River watershed in Iran. A flow of data includes three inputs; each of them belongs to one part of three zones of a fluvial system. The three parts of the Sefidrood River fluvial system include Zone 1,a sub-watershed as degradation modeling site,Zone 2,Sefidrood Dam as dam site,and Zone 3,17km away from the Sefidrood River path to the Caspian Sea as ending point site. The degradation model in the Zone 1 provides a suitable mean for decision support system to decrease the human impacts on each small district. The maximum number for degradation coefficient belongs to the small district with the highest physiographic density,relatively cumulative activities,and a lower figure for the habitat vulnerability. The human degradation impact were not limited to the upstream. The investigation to the Sefidrood Dam and ending point of the Sefidrood River depicts that sedimentation continues as a significant visual impact in the Sefidrood Dam reservoir and the estuary.

关键词： degradation modeling sefidrood river watershed sefidrood dam iran