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Health 2016年第11期8卷 1120-1127页

作者： Abbas Sadeghi Mahboubeh Hosein Zadeh gholam hossein niayfar Setareh Azizi Department of Counselling University of Guilan Rasht Iran Department of Professional Health Rasht Iran Department of General Psychology Rasht Iran Department of Clinical Psychology Rasht Iran

The main aim of the research is survey of relationship between personality characteristics with academic staffs’ job satisfaction and mental health in the University of Guilan. The statistic population was all these academic staffs in the year of 2014 (500). 196 individuals have selected by Kerjecy & Morgan (1970) and random sampling method. The research instruments were personality characteristics (NEO), General Health Questionnaire (GHQ) and self-made questionnaires. Pearson’s Correlation, Multiple Regression and Multiple Variant (Manova) have used for analyzing data. Results showed that there was a relationship among neurotic and settlement’s personality characteristics with job satisfaction and neurotic, openness, extroversion personality characteristics and settlement with mental health. Some of personality characteristics had been anticipators of mental health and job satisfaction and personality characteristics with mental health and job satisfaction had differenced depend on sociologic variances relationships.

关键词： Job Satisfaction Mental Health Personality Characteristics Academic Staff

Mechanical characterization of Mg-B4C nanocomposite fabricated at different strain rates

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 252-263页

作者： gholam hossein Majzoobi Kaveh Rahmani Mechanical Engineering Department Bu-Ali Sina University

Magnesium has wide application in *** main purpose of this investigation was to improve the properties of magnesium by reinforcing it using B4C *** reinforced nanocomposites were fabricated using a powder compaction technique for 0,1.5vol%,3vol%,5vol%,and 10vol% of *** compaction was conducted using a split Hopkinson bar(SHB),drop hammer(DH),and Instron to reach different compaction loading *** compressive stress–strain curves of the samples were captured from quasi-static and dynamic tests carried out using an Instron and split Hopkinson pressure bar,*** revealed that,to achieve the highest improvement in ultimate strength,the contents of B4C were 1.5vol%,3vol%,and 3vol% for Instron,DH,and SHB,*** results also indicated that the effect of compaction type on the quasi-static strength of the samples was not as significant,although its effect on the dynamic strength of the samples was *** improvement in ultimate strength obtained from the quasi-static stress–strain curves of the samples(compared to pure Mg)varied from 9.9% for DH to 24% for *** dynamic strength of the samples was improved(with respect to pure Mg)by 73%,116%,and 141%for the specimens compacted by Instron,DH,and SHB,*** improvement in strength was believed to be due to strengthening mechanisms,friction,adiabatic heating,and shock waves.

关键词： powder compaction B4C magnesium strain rate ultimate strength sintering

Perfect GMR effect in gapped graphene-based ferromagnetic normal ferromagnetic junctions

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Chinese Physics B 2015年第4期24卷 405-410页

作者： hossein Karbaschi gholam Reza Rashedi Department of Physics University of Isfahan

We investigate the quantum transport property in gapped graphene-based ferromagnetic/normal/ferromagnetic （FG/NG/FG） junctions by using the Dirac-Bogoliubov-de Gennes equation. The graphene is fabricated on SiC and BN substrates separately, so carders in FG/NG/FG structures are considered as massive relativistic particles. Transmission prob- ability, charge, and spin conductances are studied as a function of exchange energy of ferromagnets （h）, size of graphene gap, and thickness of normal graphene region （L） respectively. Using the experimental values of Fermi energy in the normal graphene part （EFN - 400 meV） and energy gap in graphene （260 meV for SiC and 50 meV for BN substrate）, it is shown that this structure can be used for both spin-up and spin-down polarized current. The latter case has different behavior of gapped FG/NG/FG from that of gapless FG/NG/FG structures. Also perfect charge giant magnetoresistance is observed in a range of E FN - mv 2 F〈h〈E FN＋mv 2 F.

关键词： graphene spin-polarized current giant magnetoresistance nanoscale structures

Maximum mass of a hot neutron star with a quark core

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Research in Astronomy and Astrophysics 2011年第4期11卷 471-481页

作者： Tayebeh Yazdizadeh gholam hossein Bordbar Islamic Azad University Bafgh Branch Department of Physics Shiraz University Research Institute for Astronomy and Astrophysics of Maragha

We have considered a hot neutron star with a quark core, a mixed phase of quark-hadron matter, and a hadronic matter crust and have determined the equation of state of the hadronic phase and the quark phase. We have then found the equation of state of the mixed phase under the Gibbs conditions. Finally, we have computed the structure of a hot neutron star with a quark core and compared our results with those of the neutron star without a quark core. For the quark matter calculations, we have used the MIT bag model in which the total energy of the system is considered as the kinetic energy of the particles plus a bag constant. For the hadronic matter calculations, we have used the lowest order constrained variational formalism. Our calculations show that the results for the maximum gravitational mass of a hot neutron star with a quark core are substantially different from those of a neutron star without the quark core.

关键词： dense matter -- equation of state -- stars fundamental parameters(masses, radii, temperatures)

A Cu-Cr alloy with nano and microscale Cr particles produced in a water-cooled copper mold

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 629-634页

作者： Seyyed Mohammd hossein Hejazi Fatemeh Majidi gholam hossein Akbari Mining Industries Research Center Shahid Bahonar University of Kerman Department of Material Science and Engineering Faculty of Engineering Shahid Bahonar University of Kerman

Microstructures have profound effects on the hardness and strength of Cu-Cr alloys. The microstructures of a Cu-Cr alloy cast in a water-cooled copper mold were studied in the present work. The scanning electron microscopy （SEM） results show that there are the copper matrix saturated with chromium, spherical precipitates of chromium separated from liquid phase during cooling before the initiation of so- lidification, and a eutectic phase in grain boundary areas. To investigate the effect of age-hardening treatment on the microstructures and properties of the material, some samples were subsequently age-hardened in a salt bath and investigated by transmission electron microscopy （TEM）. The results show that coherent precipitates with the diameter of 11 nm are detectable in the samples before and after the age-hardening stage. Of course, the volume fraction of coherent precipitates is higher after the aging process.

关键词： copper alloys chromium molding precipitation hardening nanoparticles

Calculation of the structural properties of asymmetrical nuclear matter

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Research in Astronomy and Astrophysics 2012年第3期12卷 345-358页

作者： gholam hossein Bordbar Hamideh Nadgaran Department of Physics Shiraz University Research Institute for Astronomy and Astrophysics of Maragha

The structural properties of asymmetrical nuclear matter have been calculated,employing the AV 18 potential for different values of proton to neutron *** calculations have also been made for the case of symmetrical nuclear matter with the UV14,AV14 and AV 18 *** our calculations,we used the lowest order constrained variational method to compute the correlation function of the system.

关键词： stars:neutron—dense matter—equation of state

The effects of strong magnetic fields on neutron star structure:lowest order constrained variational calculations

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Research in Astronomy and Astrophysics 2013年第2期13卷 197-206页

作者： gholam hossein Bordbar Zeinab Rezaei Department of Physics Shiraz University Center for Excellence in Astronomy and Astrophysics(CEAA-RIAAM)-Maragha

We investigate the effects of strong magnetic fields upon the large-scale properties of neutron and protoneutron stars. In our calculations, the neutron star mat- ter was approximated by pure neutron matter. Using the lowest order constrained vari- ational approach at zero and finite temperatures, and employing AV18 potential, we present the effects of strong magnetic fields on the gravitational mass, radius, and gravitational redshift of neutron and protoneutron stars. It is found that the equation of state for a neutron star becomes stiffer with an increase of magnetic field and tem- perature. This leads to larger values of the maximum mass and radius for the neutron stars.

关键词： dense matter -- equation of state -- stars magnetic fields -- stars fundamental parameters (masses, radii, temperatures)

The effect of dynamical quark mass on the calculation of a strange quark star's structure

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Research in Astronomy and Astrophysics 2012年第5期12卷 540-550页

作者： gholam hossein Bordbar Babak Ziaei Department of Physics Shiraz UniversityShiraz 71454Iran Research Institute for Astronomy and Astrophysics of Maragha P.O.Box 55134-441Maragha 55177-36698Iran

We discuss the dynamical behavior of strange quark matter components, in particular the effects of density dependent quark mass on the equation of state of strange quark matter. The dynamical masses of quarks are computed within the Nambu-Jona-Lasinio model, then we perform strange quark matter calculations em- ploying the MIT bag model with these dynamical masses. For the sake of compar- ing dynamical mass interaction with QCD quark-quark interaction, we consider the one-gluon-exchange term as the effective interaction between quarks for the MIT bag model. Our dynamical approach illustrates an improvement in the obtained equation of state values. We also investigate the structure of the strange quark star using Tolman- Oppenheimer-Volkoff equations for all applied models. Our results show that dynamical mass interaction leads to lower values for gravitational mass.

关键词： Stars dense matter - equation of state - ISM structure -- supemova remnants

MCM-41 anchored sulfonic acid (MCM-41-R-SO_3H):A mild,reusable and highly efficient heterogeneous catalyst for the Biginelli reaction

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Chinese Chemical Letters 2008年第12期19卷 1435-1439页

作者： gholam hossein Mahdavinia Hamid Sepehrian Department of Chemistry Islamic Azad University-Marvdasht BranchMarvdashtIran Jaber lbn Hayan Research Laboratories Nuclear Science and Technology Research InstituteAEOIP.O.Box 11365/8486TehranIran

An efficient three-component synthesis of 3,4-dihydropyrimidinones using MCM-41 anchored sulfonic acid （MCM-41-R-SO3H） as a mild, heterogeneous catalyst for Biginelli reaction in CH3CN under reflux condition is desc... 详细信息

关键词： One-pot MCM-41-R-SO3H Heterogeneous Biginelli reaction Multicomponent

Computation of the structure of a magnetized strange quark star

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Research in Astronomy and Astrophysics 2011年第7期11卷 851-862页

作者： gholam hossein Bordbar Ali Reza Peivand Department of Physics Shiraz University Research Institute for Astronomy and Astrophysics of Maragha Department of Physics Tafresh University

We have calculated some properties of spin polarized strange quark matter（SQM） in a strong magnetic field at zero temperature using the MIT bag *** showed that the equation of state of spin polarized SQM is stiffer than that for unpolarized *** have also computed the structural properties of a spin polarized strange quark star（SQS） and found that the presence of a magnetic field leads to a more stable SQS when compared to the structural properties of an unpolarized SQS.

关键词： dense matter—equation of state—magnetic field