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Journal of Materials Science & Technology 2014年第2期30卷 134-138页

作者： G.Faraji p.yavari S.Aghdamifar M.Mosavi Mashhadi Department of Mechanical Engineering University College of EngineeringUniversity of Tehran Department of Mechanical and Aerospace Engineering Science and Research BranchIslamic Azad University

Ultra-fine grained （UFG） cylindrical tubes were produced via recently developed tubular channel angular pressing （TCAp） process through different passes from as-cast AZ91 magnesium alloy. The microstructure and mechanical properties of processed tube through one to four passes of TCAp process at 200℃ were investigated. Microhardness of the processed tube was increased to 98.5 HV after one pass from an initial value of 67 Hr. An increase in the number of passes from one to higher number of passes has no more effect on the microhardness. Yield and ultimate strengths were increased by 4.3 and 1.4 times compared to those in as-cast condition. Notable increase in the strength was achieved after one pass of TCAp while higher number of passes has no more effect. Microstructural investigation shows notable decrease in the grain size to around 500 nm from the primary value of - 150 μm. Dissolution and distribution of hard MglTAI12 phase in the grain boundaries of dynamically recrystallized UFG AZ91 with a mean grain size of - 500 nm was an interesting issue of TCAp processing at 200 ℃ compared to other severe plastic deformation processes.

关键词： Severe plastic deformation Tubular channel angular pressing AZ91 Grain refinement Mechanical behaviour

Exact Solutions of the Equilibrium Shape Equations in a General WLC Model for DNA Forms

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Communications in Theoretical physics 2013年第1期59卷 125-130页

作者： Morteza yavari Department of physics Islamic Azad University

In this letter,we are going to use a geometrical approach to describe the free energy of DNA *** exact solutions of the equilibrium shape equations in a general WLC model for DNA forms by using the Feoli’s formalism [***,et al.,***.B 705(2005) 577] are ***,the free energy of transition between Band Z-DNA is calculated in this formalism.

关键词： equilibrium shape equation general WLC model Feoli’s formalism B-to Z-DNA transition

Energy Distribution for a power Model of the plane Symmetric Spacetime in f (R) Gravity

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Communications in Theoretical physics 2013年第9期60卷 323-327页

作者： Morteza yavari Islamic Azad University Kashan Branch

The study of the energy localization in f(R)theories of gravity has attracted much interest in recent *** this paper,the vacuum solutions of the modified field equations for a power model of plane symmetric metric are studied in metric f(R)gravity with the assumption of constant Ricci ***,we determine the energy-momentum complexes in f(R)theories of gravity for this spacetime for some important *** also show that these models satisfy the stability and constant curvature conditions.

关键词： plane symmetric spacetime power model generalized Landu-Lifshitz energy-momentum f(R)gravity

Synthesis of alkyl bis(dimethylamino)methylenecarbamodithioates from 1,1,3,3-tetramethylguanidine,CS_2 and oxiranes

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Chinese Chemical Letters 2012年第6期23卷 699-702页

作者： Sima yavari Samira Nasiri-Gheidari Avat(Arman)Taherpour Issa yavari Department of Chemistry Arak BranchIslamic Azad UniversityArakIran Department of Chemistry Tarbiat Modares UniversityP.O.Box 14115-175Tehranlran Department of Chemistry Tarbiat Modares UniversityP.O.Box 14115-175TehranIran

An efficient synthesis of alkyl bis（dimethylamino）methylenecarbamodithioates via a one-pot reaction between 1,1,3,3- tetramethylguanidine, carbon disulfide and substituted oxiranes, in good yields, is described.

关键词： Carbamodithioate Oxirane Tetrarnethylguanidine Carbon disulfide One-pot reaction Solvent free

Landau damping in a dipolar Bose–Fermi mixture in the Bose–Einstein condensation(BEC) limit

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Chinese physics B 2016年第12期25卷 367-376页

作者： S M Moniri H yavari E Darsheshdar Department of physics University of Isfahan

By using a mean-field approximation which describes the coupled oscillations of condensate and noncondensate atoms in the collisionless regime, Landau damping in a dilute dipolar Bose-Fermi mixture in the BEC limit where Fermi superfluid is treated as tightly bounded molecules, is investigated. In the case of a uniform quasi-two-dimensional （2D） case, the results for the Landau damping due to the Bose-Fermi interaction are obtained at low and high temperatures. It is shown that at low temperatures, the Landau damping rate is exponentially suppressed. By increasing the strength of dipolar interaction, and the energy of boson quasiparticles, Landau damping is suppressed over a broader temperature range.

关键词： Landau damping mixtures of Bose and Fermi superfluids dipole-dipole interaction

Tandem synthesis of functionalized hexaalkyl benzoisoquinolinopyrrolonaphthyridine-hexacarboxylate, via isoquinoline based multi-component reaction

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Chinese Chemical Letters 2013年第11期24卷 979-983页

作者： Mohammad piltan Issa yavari Loghman Moradi Department of Chemistry Sanandaj Branch Islamic Azad University Chemistry Department Tarbiat Modares University Department of Chemistry Faculty of Science University of Kurdistan

An expedient,synthetic method to fused polycyclic derivatives of isoquinoline is described via tandem reaction of isoquinoline,dialkyl acetylenedicarboxylates and dialkyl chloromalonate.

关键词： Isoquinoline Tandem reaction Acetylenic esters Dialkyl chloromalonate

Synthesis of functionalized azadienes from aminobenzothiazole,acetylenic esters and isocyanides

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Chinese Chemical Letters 2012年第1期23卷 49-52页

作者： Issa yavari Samira Arab-Salmanabadi Ali Aminkhani Department of Chemistry Science and Research BranchIslamic Azad UniversityTehranlran

The reaction between 2-aminobenzothiazole with dialkyl acetylenedicarboxylates in the presence of isocyanides,leads to functionalized azadienes in good yields.

关键词： Aminobenzothiazole Azadiene Isocyanide Zwitterionic intermediate

Retractable Compact Directed Complete poset （Acts）

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Algebra Colloquium 2017年第4期24卷 625-638页

作者： M. Mehdl Ebrahiml Mojgan Mahmoudi Mahdieh yavari Department of Mathematics Shahid Bebeshti University G.C. Tehran 19839 lran

Taking domains in the one hand and actions of a semigroup （automaton） on the other, as two crucial notions in mathematics as well as in computer science, we consider the notion of compact directed complete poset （acts）, and investigate the interesting notion of absolute retractness for such ordered structures. As monomorphisms and embeddings for domain acts are different notions, we study absolute retractness with respect to both the class of monomorphisms and that of embed- dings for compact directed complete poset （acts）. We characterize the absolutely retract compact dcpos as complete compact chains. Also, we give some examples of compact di- rected complete poset acts which are （g-）absolutely retract （with respect to embeddings） and show that completeness is not a sufficient condition for （g-）absolute retractness.

关键词： action of a monoid directed complete poset compact absolutely retract

Isoquinoline-mediated 5-vinylation and N-vinylation of benzo[d]oxazole-2-thiol and benzo[d]thiazole-2-thiol

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Chinese Chemical Letters 2012年第1期23卷 5-8页

作者： Issa yavari Samira Nasiri-Gheidari Anvar Mirzaei Department of Chemistry Tarbiat Modares UniversityPO Box 14115-175TehranIran

An effective route to 5-vinylated and N-vinylated benzo[d]oxazole-2（3H）-thiones and benzo[d]thiazole-2（3H）-thiones is described via reaction of acetylenic esters and benzo[d]oxazole-2-thiol and benzo[d]thiazole-2-... 详细信息

关键词： S-Vinylation N-Vinylation Acetylenic esters Benzo[d]oxazole-2-thiol Benzo[d]thiazole-2-thiol Isoquinoline

Biodegradation of natural and synthetic estrogens in moving bed bioreactor

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Chinese Journal of Chemical Engineering 2018年第2期26卷 393-399页

作者： Mohammad Mehdi Amin Bijan Bina Karim Ebrahim Zeynab yavari Farzaneh Mohammadi Environment Research Center Research Institute for Primordial Prevention of Non-communicable Disease Isfahan University of Medical Sciences Department of Environmental Health Engineering School of Health Isfahan University of Medical Sciences Student Research Committee Isfahan University of Medical Sciences

Estrogen hormones as a group of endocrine disruptive compounds （EDC） can interfere with endocrine system in humans and animals. The goal of this study was to investigate the elimination rate of Estrone （El）, 17β-estradiol （E2） and 17α-ethinyl estradiol （EE2） in Moving Bed Bioreactor （MBBR）. These analytes extracted by Dispersive Liquid-Liquid Microextraction （DLLME） technique, followed by derivatization, and detected by GC/MS. Estrogen removal efficiency in MBBR improved at high solid retention times （SRTs）, which notion is owing to development ofnitrification. Estrogenspecificremovalratewasbetween 0,22-1.45μg.（gVSS） 1.d -1 for natural and synthetic hormones. The adsorption rate was 0.9%-3.2% 0-1.3%, and 0.7%-5.7% for E1, E2, and EE2, respectively. In addition, the biodegradation rates were more than 95% for these compounds. These results illustrated that in MBBR, the hiodegradation and the adsorption to biomass are considered as two significant routes for elimination of estrogenic compounds. As a whole, the deterioration rate of estrogens enhanced by MBBR compared to other biological wastewater treatment processes such as conventional activated sludge.

关键词： Estrogen hormones Adsorption Biodegradation Nitrification