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LOCV calculation of the equations of state and properties of rapidly rotating neutron stars

Chinese Physics C 2018年第6期42卷 128-133页

作者： A.H.Farajian m.bigdeli S.Belbasi Department of Physics University of Zanjan

In this paper, we have investigated the structural properties of rotating neutron stars using the numerical RNS code and equations of state which have been calculated within the lowest order constrained variational（LOCV）approach. In order to calculate the equation of state of nuclear matter, we have used UV（14）＋TNI and AV（18） *** have computed the maximum mass of the neutron star and the corresponding equatorial radius at different angular velocities. We have also computed the structural properties of Keplerian rotating neutron stars for the maximum mass configuration, mK, RK, fK and jmax.

关键词： LOCV method neutron star matter equation of state rotating neutron star

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Silica supported perchloric acid(HClO_4-SiO_2):A mild,reusable and highly efficient heterogeneous catalyst for the synthesis of amidoalkyl naphthols

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Chinese Chemical Letters 2008年第10期19卷 1171-1174页

作者： Gholam Hossein mahdavinia mohammad A.bigdeli majid m.Heravi Department of Chemistry Islamic Azad University-Marvdasht BranchMarvdashtIran Faculty of Chemistry Teacher Training University49 Mofateh StreetTehranIran Department of Chemistry School of SciencesAzzahra UniversityVanakTehranIran

An efficient and direct procedure has been developed for the preparation of amidoalkyl naphthols by a one-pot condensation of aryl aldehydes, 2-naphthol and urea or amides, in the presence of HClO4-SiO2 as a heterogeneous catalyst. The reactions were carried out under reflux and solvent-free conditions. The present methodology offers several advantages such as excellent yields, simple procedure, easy work-up and ecofriendly reaction condition. The catalyst is easily prepared, stable, reusable and efficient under the reaction conditions.

关键词： One-pot HClO4-SiO2 Heterogeneous catalyst Amidoalkyl naphthol multicomponent reaction

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A Novel Cooperative Spectrum Sharing Algorithm Based on Optimal Cognitive Radio User Selection

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International Journal of Communications, Network and System Sciences 2012年第1期5卷 7-16页

作者： mohammad bigdeli Bahman Abolhassani 不详

In this paper, we consider the problem of cognitive radio (CR) user selection to maximize overall CR network (CRN) throughput when the available spectrum bandwidth is less than the demand by all CR users. We formulate optimal CR user selection problem. Then, based on approximation of the average received signal to interference plus noise ratio (SINR) and adaptive modulation and coding (AmC), we estimate the required bandwidth of CR users with different required quality of services (QoSs). Using the principle of optimality, we propose a novel cooperative spectrum sharing algorithm for a CRN. The proposed algorithm not only achieves exhaustive search performance but also its complexity is in the order of N × m versus 2N for exhaustive search, where N is the number of CR users, and m is the spectrum pool size. Extensive simulation results illustrate that the proposed algorithm significantly outperforms the existing algorithms that ignore optimal CR user selection. Also, these results illustrate a better fairness criterion than those of previous works.

关键词： Cognitive Radio Network (CRN) Spectrum Sharing Spectrum Pool Principle of Optimality

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