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Effect of magnetic Field on Internal Energy and Entropy of a Parabolic Cylindrical Quantum Dot

Communications in Theoretical Physics 2013年第5期59卷 655-660页

作者： R. Khordad m.a. sadeghzadeh A. mohamadian Jahan-abad Department of Physics College of SciencesYasouj University Department of Physics College of SciencesYazd University

In the present work, the entropy and internal energy of a GaAs cylindrical quantum dot in the presence of an applied magnetic field is studied. For this purpose, the Tsallis formalism is applied to obtain internal energy and entropy. It is found that entropy and internal energy are continuous function and they are zero at special temperatures. Entropy maximum increases with increasing dot radius. Internal energy increases by increasing magnetic field.

关键词： quantum dot entropy magnetic field internal energy

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Growth of TiO_2 Nanorods by Sol-gel Template Process

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Journal of materials Science & Technology 2007年第5期23卷 611-613页

作者： A.sadeghzadeh Attar Sh.mirdamadi F.Hajiesmaeilbaigi m.Sasani Gham.a.i Department of metallurgy and materials Engineering Iran University of Science and TechnologyTehranIran Solid State Laser Research Group Laser Research Center11365-8486TehranIran

In this work, TiO2 nanorods with uniform diameter of about 100 nm.a.d a length of several micrometers were successfully prepared by the sol-gel template method. Also the influence of molar ratios of precursor on the morphology and structure of TiO2 nanorods has been investigated. The prepared samples were characterized by Fourier transform infrared spectroscopy （FTIR）, X-ray diffraction （XRD） and scanning electron microscopy （SEm）. The XRD results indicated that the TiO2 nanorods were crystallized in the anatase and rutile phases, after annealing to 400-700℃ up to 2 h.

关键词： TiO2 nanorods Sol-gel process Template-based growth

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Nanospheroidal particles as convenient nanoantenna elements

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Chinese Optics Letters 2013年第11期11卷 96-99页

作者： m.Khosravi R.A.sadeghzadeh m.S.Abrisham.a. Department of Electrical and Computer Engineering K. N. Toosi University of Technology

A highly tunable optical nanoantenna element is proposed through gradual transformation from.a.sphere to a prolate spheroid. This new element induces field enhancement and an increase in resonance frequency. Rather than a purely metallic material, we propose the use of a metal-coated dielectric spheroid as a nanoelement because of its flexibility. We show that a spheroidal element enhances the near-field better than its rod and sphere counterparts. As such, spheroidal elements are good candidates for improving solar-cell performance.

关键词： Nanospheroidal particles as convenient nanoantenna elements

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Preparation and Properties of Carrageenan-g-Poly(Acrylic Acid)/Bentonite Superabsorbent Composite

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Journal of Biomaterials and Nanobiotechnology 2011年第3期2卷 311-317页

作者： H. Hosseinzadeh m. sadeghzadeh m. Babazadeh 不详

A novel biopolymer-based superabsorbent hydrogel composite based on kappa-carrageenan (κC) have been prepared via graft copolymerization of acrylic acid (AA) in the presence of bentonite powder using methylenebisacrylamide (m.a. as a crosslinking agent and ammonium persulfate (APS) as an initiator. The hydrogel structure was confirmed using FTIR spectroscopy and the morphology of the samples was examined by scanning electron microscopy (SEm). The affecting variables onto graft polymerization (i.e. AA, m.a.and APS concentration, as well as the bentonite amount) were systematically optimized to achieve a hydrogel with swelling capacity as high as possible. The results of Brunauer–Emmett–Teller (BET) analysis showed that the average pore diameter of the synthesized hydrogel was 11.5 nm. The effect of various salt media and solutions with different pHs on the swelling of the superabsorbent was also studied.

关键词： Carrageenan Bentonite Poly(acrylic acid) Hydrogel Composite

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Implementation of An Efficient Hybrid method for the Analysis of Interference in High Frequency Circuits

Implementation of An Efficient Hybrid Method for the Analysi...

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2007 5th International Conference on microwave and millimeter Wave Technology(ICmmT’2007)

作者： m.Bahadorzadeh R.A.sadeghzadeh m.Naser moghaddasi Electrical Eng.Dept.Islamic Azad University Science & Research CampusTehran-IRAN

A new method for Analysis of interference in high frequency has been used for evaluation of the interference of two loop *** method is based on the Transmission Line matrix (TLm) method augmented with a timedomain integral equation formulation to account for the radiation of equivalent sources and to evaluate the interfering electromagnetic fields.A com.a.ison between This method which is referred as the IRIS method (Interference and Radiation of Internal surfaces) and Different Approaches for the Analysis of Interference has been *** result of classical TLm.a.alysis and the IRIS method analysis for Interfering of loop antennas has been represented.

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New Synthesized （3-（3,4-dimethoxyphenyl）isoxazole-5- yl） methanol as Corrosion Inhibitor on Steel in 1 m HCI

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Journal of Chemistry and Chemical Engineering 2012年第9期6卷 803-808页

作者： Ladan Edjlali Roghayeh sadeghzadeh Hossein Babazadeh Darabi moham.a. Taghi Vardini Department of Applied Chemistry Faculty of Science Tabriz Branch Islamic Azad University Tabriz 1655 Iran

The inhibition of corrosion of steel in molar hydrochloric acid solution by new synthesized DmI （（3-（3,4-dimethoxyphenyl）isoxazole-5-yl） methanol） compound is studied by weight loss and electrochemical polarization m.a.urements. The two methods give consistent results. The polarization curves indicate that the DmI compound acts as mixed-type inhibitor. This compound is efficient inhibitor. The inhibition efficiency increases with the increase of inhibitor concentration to reach 96% at 10-3 m for DmI. The temperature effect on the corrosion behavior of steel in 1 m HCI with and without the DmI compound at 10-3 m is studied in the temperature range from 298 to 318 K. The adsorption of inhibitor on the steel surface is found to obey the Frumkin adsorption isotherm model. From the adsorption isotherm, some thermodynamic data for the adsorption process （f, K and △Gads） are calculated and discussed.

关键词： Isoxazolc inhibitor steel corrosion electrochemical polarization

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