SpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Numerical solution of Reynold’s equation governing noncircular gas bearing system using radial basis function389397255510.22099/ijsts.2014.2555ENH. Rasooli ShoorokiFaculty of Mathematics, Yazd University, Yazd, IranR. Rashidi MeybodiDepartment of Mechanical Engineering, Payame Noor University, Tehran, IranS. M. KarbassiFaculty of Advanced Education, Islamic Azad University, Yazd Branch, Yazd, IranG. B. LoghmaniFaculty of Mathematics, Yazd University, Yazd, IranJournal Article20130130In this paper, the static characteristics of two-lobe, three-lobe and four-lobe noncircular gas journal bearing systems are
studied in detail. The Reynold’s equation governing the noncircular gas bearing systems are analyzed by using Radial Basis
Functions (RBF). The solutions are obtained numerically by solving systems of algebraic equations. The equilibrium position
of the rotor is obtained without using the trial and error method; which is the merit of our method.http://ijsts.shirazu.ac.ir/article_2555_85c60ec37dc6ac51bf5b56b645f983b6.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222A NSFD scheme for Lotka–Volterra food web model399414255610.22099/ijsts.2014.2556ENS. ZibaeiDepartment of Mathematics, School of Mathematical Sciences, Vali-e-Asr
University of Rafsanjan, Rafsanjan, IranM. NamjooDepartment of Mathematics, School of Mathematical Sciences, Vali-e-Asr
University of Rafsanjan , Rafsanjan, IranJournal Article20140422A nonstandard finite difference (NSFD) scheme has been constructed and analyzed for a mathematical model that <br /><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">describes Lotka</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">–</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">Volterra food web model. This new discrete system has the same stability properties as the</span></span> <br />continuous model and,on the whole, it preservesthe same local asymptotic stability properties. Linearized stability <br /><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">theory and Schur</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">–</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">Cohn criteria are used for local asymptoticstability of this discrete time model. Numerical</span></span> <br />results are given to support the results.http://ijsts.shirazu.ac.ir/article_2556_15485c9c4d6bac19c0ab1d9049d4345b.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222E1, E2 and M1 transitions between n=3 levels in magnesium-like tungsten415421255710.22099/ijsts.2014.2557ENG. Günday KonanDepartment of Physics, Sakarya University, 54187, Sakarya, TurkeyS. KabakçıDepartment of Physics, Sakarya University, 54187, Sakarya, TurkeyL. ÖzdemirDepartment of Physics, Sakarya University, 54187, Sakarya, TurkeyJournal Article20130913
<span style="font-size: xx-small;">Electric dipole (E1) transitions of 3s-3p and 3p-3d, and electric quadrupole (E2) and magnetic dipole (M1) transitions between fine structure levels of 3s3p and 3p</span><span style="font-size: xx-small;">2 </span><span style="font-size: xx-small;">in Mg-like tungsten (W</span><span style="font-size: xx-small;">62+</span><span style="font-size: xx-small;">) have been studied by multiconfiguration Hartree-Fock (MCHF) method. Multielectron ions of high-Z elements are of interest in atomic structure theory. In this work Breit-Pauli relativistic contributions and correlation effects have been considered. The magnesium-like tungsten lines obtained from this work are compared with other theoretical and experimental results. </span>
http://ijsts.shirazu.ac.ir/article_2557_96a6195489c4d481880b2c0965522a90.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Analytical solutions for the fractional nonlinear telegraph equation using a modified homotopy perturbation and separation of variables methods423433255810.22099/ijsts.2014.2558ENH. KheiriDepartment of Applied Mathematics, Faculty of Mathematical Sciences, University of Tabriz, Tabriz, IranS. Irandoust-PakchinDepartment of Applied Mathematics, Faculty of Mathematical Sciences, University of Tabriz, Tabriz, IranM. JavidiDepartment of Applied Mathematics, Faculty of Mathematical Sciences, University of Tabriz, Tabriz, IranJournal Article20140219
<span style="font-size: xx-small;">In this paper, first a new homotopy perturbation method for solving a fractional order nonlinear telegraph equation is introduced. By applying the proposed method, the nonlinear equation is translated to linear equations for per iteration of homotopy perturbation method. Then, the obtained problems are solved with separation method. In the examples, it is illustrated that the exact solution is obtained in one iteration by conveniently separating source term of equation. </span>http://ijsts.shirazu.ac.ir/article_2558_19fcab0c6999ed50cf09038e2fc4e390.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222A new model for vulnerability assessment of drought in Iran using Percent of Normal Precipitation Index (PNPI)435440255910.22099/ijsts.2014.2559ENM. MasoudiDepartment of Natural Resources and Environment, College of Agriculture, Shiraz University, IranS. HakimiDepartment of Natural Resources and Environment, College of Agriculture, Shiraz University, IranJournal Article20130801
<span style="font-size: xx-small;">The Percent of Normal Precipitation Index (PNPI) is a widely used drought index to provide good estimations about the intensity, magnitude and spatial extent of droughts. The objective of this study was analyzing spatial pattern of drought by PNPI index. In this paper, according to the data of 40 stations in Iran, during 1967-2009, the pattern of drought hazard is evaluated. Influenced zone of each station was specified by Thiessen method. An attempt was made to create a new model of drought hazard using GIS. Three criteria for drought were studied and considered to define areas under vulnerability. Drought hazard criteria used in the present model include: maximum severity of drought in the period, trend of drought, and the maximum number of sequential arid years. Both the vulnerability indicator map and also final hazard map are classified into 5 hazard classes of drought: None, slight, moderate, severe and very severe. The final drought vulnerability map was prepared by overlaying three criteria maps in the GIS and the final hazard classes were defined on the basis of hazard scores arrived at by the mean of the main indicators, deploying the new model. The final vulnerability map shows that severe hazard areas (58% of the country) which are observed more in the northwestern, southeastern and central parts of the country are much more widespread than areas under other hazard classes. </span>http://ijsts.shirazu.ac.ir/article_2559_258f784e4a2bec508730c626b6028437.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Numerical modeling of the temporal response of back-gated metalsemiconductor- metal photodetector in an equilibrium condition441444256010.22099/ijsts.2014.2560ENA. HabibpourDepatment of physics, Islamic Azad University, Kazerun Branch, Kazerun, IranN. DasDepartment of Electrical and Computer Engineering, Curtin University, AustraliaH. R. MashayekhiFaculty of Science, University of Kerman, Kerman, IranJournal Article20130726
<span style="font-size: xx-small;">We have simulated the carrier concentration and temporal response characteristics of a Back-Gated Metal- Semiconductor-Metal (BG-MSM) photodetector in one dimension as a function of optical pulse position on the active region in an equilibrium condition (without bias voltage to the photodetector). We have adopted a nonlinear ambipolar transport model to simulate the behavior of photo-generated carriers in the active region of the BG-MSM photodetector. From the simulation results, it is observed that for optical pulse positions in the cathode region, the magnitude of the response current is exactly the same but opposite that of the anode region. The response of the photodetector is zero when a pulse is positioned at the center of the active region. This important feature of the device could make it attractive for micro-scale positioning of highly sensitive instruments. Our simulation results agreed well with the experimental results. </span>http://ijsts.shirazu.ac.ir/article_2560_78a43199e054cf68aafc6f8dc1f77ee6.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Structure of quasi ordered ∗-vector spaces445453256110.22099/ijsts.2014.2561ENG. H. EsslamzadehDepartment of Mathematics, College of Sciences, Shiraz University, Shiraz 71454, IranM. Moazami GoodarziDepartment of Mathematics, College of Sciences, Shiraz University, Shiraz 71454, IranF. TaleghaniDepartment of Mathematics, College of Sciences, Shiraz University, Shiraz 71454, IranJournal Article20131019
<span style="font-size: xx-small;">Let </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">(𝑋,𝑋</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">+</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">) </span></span><span style="font-size: xx-small;">be a quasi ordered </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">∗</span></span><span style="font-size: xx-small;">-vector space with order unit, that is, a </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">∗</span></span><span style="font-size: xx-small;">-vector space </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">𝑋 </span></span><span style="font-size: xx-small;">with order unite together with a cone </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">𝑋</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">+</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">⊆𝑋</span></span><span style="font-size: xx-small;">. Our main goal is to find a condition weaker than properness of </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">𝑋</span></span><span style="font-size: xx-small;">, which su</span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">ffi</span></span><span style="font-size: xx-small;">ces for fundamental results of ordered vector space theory to work. We show that having a non-empty state space or equivalently having a non-negative order unit is a suitable replacement for properness of </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">𝑋+</span></span><span style="font-size: xx-small;">. At first, we examine real vector spaces and then the complex case. Then we apply the results to self adjoint unital subspaces of unital </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="KO">∗</span></span><span style="font-size: xx-small;">-algebras to find direct and shorter proofs of some of the existing results in the literature. </span>http://ijsts.shirazu.ac.ir/article_2561_38b0fd0cff8b3aaffb439bd8ee4cc2e6.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Existence solutions for nonlocal fractional differential equation with nonlinear boundary conditions455461256210.22099/ijsts.2014.2562ENN. NyamoradiDepartment of Mathematics, Faculty of Sciences, Razi University, 67149 Kermanshah, IranH. Alaei DizajiDepartment of Mathematics, Payame Noor University, IranJournal Article20130306
<span style="font-size: xx-small;">In this paper, by employing the Guo-Krasnoselskii fixed point theorem in a cone, we study the existence of positive solutions to the following nonlocal fractional boundary value problems </span>
<span style="font-size: xx-small;">{ </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝐷</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">0</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">+ </span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝛼 </span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝑢(𝑡) = 𝑓(𝑡, 𝑢(𝑡)), 𝑡 ∈ (0,1), 𝑢𝑡 + 𝑢′(0) = 12 [𝐻1(𝜑𝑢) + ∫ 𝐻2 𝐸(𝑠 𝑢𝑠)𝑑𝑠 , 𝑢1) + 𝑢′(1) = 0, </span></span><span style="font-size: xx-small;">c </span>
<span style="font-size: xx-small;">where </span><span style="font-size: xx-small;">c</span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝐷0</span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">+ </span></span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝛼</span></span><span style="font-size: xx-small;">is the standard Caputo derivative of order </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝛼 1 < 𝛼< 2, 𝐸⊆ (0,1) </span></span><span style="font-size: xx-small;">is some measurable set. We provide conditions on </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝑓 𝐻1, 𝐻2 </span></span><span style="font-size: xx-small;">and </span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;" lang="JA">𝜑</span></span><span style="font-size: xx-small;">such that the problem exhibits at least one positive solution. </span>http://ijsts.shirazu.ac.ir/article_2562_89c639061537ef57883fe24a62f10c88.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Friedel–Crafts acylation of aromatic compounds463471256310.22099/ijsts.2014.2563ENA. R. HajipourPharmaceutical Research Laboratory, Department of Chemistry, Isfahan
University of Technology, Isfahan 84156, IranS. H. NazemzadehPharmaceutical Research Laboratory, Department of Chemistry, Isfahan
University of Technology, Isfahan 84156, IranH. KarimiPharmaceutical Research Laboratory, Department of Chemistry, Isfahan
University of Technology, Isfahan 84156, IranJournal Article20141222
<span style="font-size: xx-small;">An efficient method for the Friedel–Crafts acylation of a wide range of aromatic compounds in good to excellent yields under solvent-free conditions, using iron zirconium phosphate (ZPFe) was investigated. The catalyst is easy to prepare and shows interesting catalytic properties. The catalyst was characterized by some instrumental techniques such as XRD, ICP-OES, SEM and TEM. A wide variety of benzene derivatives reacted easily with benzoyl chloride and some of its derivatives to afford the corresponding aromatic ketones in clean and good yields with the para isomer predominating typically using 3mol% of catalyst. The use of inexpensive materials, simple and clean work-up, short reaction times in most cases and good yields are the main advantages of this method. This work introduces a new application of this catalyst, not described in the literature until now. Also, the catalyst can be recovered and reused for three times without a significant loss in its activity and selectivity. </span>http://ijsts.shirazu.ac.ir/article_2563_12abf4a75c21b1b2ed8a550b3c2bbe21.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Numerical technique for integro-differential equations arising in oscillating magnetic fields473479256410.22099/ijsts.2014.2564ENM. GhasemiDepartment of Applied Mathematics, Faculty of Mathematical Sciences,
Shahrekord University, P.O. Box 115, Shahrekord, IranJournal Article20130726
<span style="font-size: xx-small;">In this paper, we propose the Chebyshev wavelet approximation for the numerical solution of a class of integro-di</span><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;"><span style="font-family: Cambria Math,Cambria Math; font-size: xx-small;">ff</span></span><span style="font-size: xx-small;">erential equation which describes the charged particle motion for certain configurations of oscillating magnetic fields. We show that the Chebyshev approximation transform an integral equation to an explicit system of linear algebraic equations. Illustrative examples are included to demonstrate the validity and applicability of the new technique. </span>http://ijsts.shirazu.ac.ir/article_2564_460fcd2e3895b13df5b4ce1025525b93.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Effective workflow for optimization of intelligent well completions481487256510.22099/ijsts.2014.2565ENT. BehrouzInstitute of Petroleum Engineering (IPE), School of Chemical Engineering,
Faculties of Engineering, University of Tehran, Tehran, IranM. R. RasaeiInstitute of Petroleum Engineering (IPE), School of Chemical Engineering,
Faculties of Engineering, University of Tehran, Tehran, IranR. MasoudiInstitute of Petroleum Engineering (IPE), School of Chemical Engineering,
Faculties of Engineering, University of Tehran, Tehran, IranJournal Article20131214 <br /><span style="font-size: xx-small;">Intelligent wells provide the ability for monitoring and control of downhole environment of the wells. Downhole monitoring is achieved through sensors while control is realized with downhole valves. Recovery from intelligent wells can be improved by proper selection of candidate wells/fields and optimizing the number, location and performance of the installed Interval Control Valves. Design criteria, however, suffer from incomplete understanding of the precise determination of these parameters, their interaction and combined effects. </span> <br />Having known the candidate well, we presented a new workflow to optimize the number, location and performance of Interval Control Valves as the main element of intelligent wells. This is a very computationally demanding and time consuming task; therefore a proxy model is developed and applied to speed up the process. Primary evaluations show that optimization of each parameter independently is not the best practice because of their interrelation and combined effects on objective function. An integrated optimization approach is therefore developed in which all the Interval Control Valves’ parameters are optimized together during the process. Considerable improvement in cumulative oil production and control of produced water is achieved by applying this method on real field data.http://ijsts.shirazu.ac.ir/article_2565_bf062ef8fb77d7f45954165c1a95757a.pdfSpringerIranian Journal of Science and Technology (Sciences)1028-627638420141222Synthesis and characterization of new acyclic octadentate ligand and its complexes489497256610.22099/ijsts.2014.2566ENF. H. A. Al-JebooriMinistry of Science and Technology, Baghdad, IraqK. k. HammudMinistry of Science and Technology, Baghdad, IraqM. J. Al-JebooriCollege of Education-Ibn-Al-Haitham, Baghdad University, Baghdad, IraqJournal Article20140117
<span style="font-size: xx-small;">The reaction of an equivalent of 2- mercaptoethyl ammonium chloride with an equivalent of 2,6-diformyl -4- methyl phenol produced monoamine which was reacted with half equivalent of 1,2-diamine ethane to produce ethylene-bis-6-(2-mercapto-ethyl-imine)-methyl -4- methyl phenol [H</span><span style="font-size: xx-small;">4</span><span style="font-size: xx-small;">L]. The ligand was reacted with metal ions[Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II)] at reflux ethanol, under nitrogen at atmosphere. The ligand and derivative 2,6-diformyl-4-methylphenol and metal ion complexes were characterized by elemental microanalysis, IR, UV, (</span><span style="font-size: xx-small;">1</span><span style="font-size: xx-small;">H, </span><span style="font-size: xx-small;">13</span><span style="font-size: xx-small;">C, </span><span style="font-size: xx-small;">1</span><span style="font-size: xx-small;">H-</span><span style="font-size: xx-small;">1</span><span style="font-size: xx-small;">H, </span><span style="font-size: xx-small;">1</span><span style="font-size: xx-small;">H-</span><span style="font-size: xx-small;">13</span><span style="font-size: xx-small;">C)NMR and mass spectroscopies and suggested structures and octahedral for the complexes [Cr, Mn, Co, and Ni] while complexes of [Fe, Zn, Cd, and Hg] suggested tetrahedral geometry and a distorted square planar geometry around copper complex. </span>http://ijsts.shirazu.ac.ir/article_2566_7e6b8b7d40182dd87f66611188880820.pdf