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The C–V and G/ω–V Electrical Characteristics of ^(60)Co γ-Ray Irradiated Al/Si_(3)N_(4)/p-Si (mIS) Structures

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Chinese Physics Letters 2013年第7期30卷 193-197页

作者： S.Zeyrek A.Turan m.m.bülbül Department of Physics Faculty of Arts and SciencesDumlupınar University43100KütahyaTurkey Department of Physics Faculty of SciencesGazi University06500BeşevlerAnkaraTurkey

The influence of ^(60)Co(γ-ray)irradiation on the electrical characteristics of Al/Si_(3)N_(4)/p-Si(mIS)structures is investigated using capacitance-voltage(C–V)and conductance-voltage(G/ω–V)*** mIS structures are exposed to a ^(60)Coγradiation source at a dose of 0.7 kGy/h,with a total dose range of 0–100 *** C–V and G/ω–V properties are measured before and after ^(60)Coγ-ray irradiation at 500 kHz and room *** is found that the capacitance and conductance values decrease with the increase in the total dose due to the irradiation-induced defects at the *** results also indicate thatγradiation causes an increase in the barrier height Фb,Fermi energy EF and depletion layer width W_(D).The interface state density(N_(ss)),using the Hill–Coleman method and dependent on radiation dose,is determined from the C–V and G/ω–V measurements and decreases with an increase in the radiation *** decrease in the interface states can be attributed to the decrease in the recombination centers and the passivation of the Si surface due to the deposition insulator layer(Si_(3)N_(4)).In addition,it is clear that the acceptor concentration NA decreases with increasing radiation *** profile of series resistance Rs for various radiation doses is obtained from forward and reverse-biased C–V and G/ω–V measurements,and its values decrease with increasing radiation dose,while it increases with increasing voltage in the accumulation region.

关键词： capacitance interface attributed

ON SOLVAbILITY OF A bOUNDARY VALUE PRObLEm FOR THE POISSON EQUATION WITH A NONLOCAL bOUNDARY OPERATOR

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Acta mathematica Scientia 2015年第5期35卷 970-980页

作者： b.J.KADIRKULOV m.KIRANE Tashkent State Institute for Oriental Studies Laboratoire de mathématiques Image et Applications Université de La Rochelle NAAm Research Group Department of Mathematics Faculty of ScienceKing Abdulaziz University

In this work, we investigate the solvability of the boundary value problem for the Poisson equation, involving a generalized Riemann-Liouville and the Caputo derivative of fractional order in the class of smooth functions. The considered problems are generalization of the known Dirichlet and Neumann oroblems with operators of a fractional order.

关键词： operator of fractional integration and differentiation solvability boundary value problem Riemann-Liouville operator Caputo fractional derivative Poisson equation Dirichlet and Neumann problems

EmDEN-FOWLER TYPE SYSTEm:NOETHER SYmmETRIES AND FIRST INTEGRALS

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Acta mathematica Scientia 2012年第5期32卷 1959-1966页

作者： b.muatjetjeja C.m.Khalique International Institute for Symmetry Analysis and mathematical modelling Department of Mathematical SciencesNorth-West UniversityMafikeng CampusPrivate Bag X 2046Mmabatho 2735Republic of South Africa

We classify a generalized coupled singular Emden-Fowler type system ＋a（t）vn=0,v＋b（t）um=0 with respect to the standard first-order Lagrangian according to the Noether point symmetries which it *** integrals of the various cases which admit Noether point symmetries are then *** system was discussed in the literature from the view-point of existence and uniqueness of positive solutions.

关键词： Lagrangian Noether symmetry first integrals Emden-Fowler type system Gauge function

First Principles Simulation of molecular Oxygen Adsorption on SiC Nanotubes

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Communications in Theoretical Physics 2010年第4期53卷 742-748页

作者： m.D.Ganji b.Ahaz Department of Chemistry Islamic Azad University

We study the binding of molecular oxygen to a （5, 0） single walled SiC nanotube, by means of density functional calculations. The center of a hexagon of silicon and carbon atoms in sites on SiCNT surfaces is the most stable adsorption site for 02 molecule, with a binding energy of -38.22 eV and an average Si-O binding distance of 1.698 A. We have also tested the stability of the 02-adsorbed SiCNT/CNT with ab initio molecular dynamics simulation which have been carried out at room temperature. Furthermore, the adsorption of 02 on the single walled carbon nanotubes has been investigated. Our first-principles calculations predict that the 02 adsorptive capability of silicon carbide nanotubes is much better than that of carbon nanotubes. This might have potential for gas detection and energy storage.

关键词： adsorption oxygen molecule DFT SiCNTs CNTs sensors

An Investigation on Rotating bending Fatigue behavior of Nanostructured Low-Temperature bainitic Steel

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Acta metallurgica Sinica(English Letters) 2014年第2期27卷 233-238页

作者： b.R.Shendy m.N.Yoozbashi b.Avishan S.Yazdani Faculty of materials Engineering Sahand University of Technology University of Applied Science and Technology Faculty of Engineering Azarbaijan Shahid Madani University

The aim of this work is to investigate the fatigue behavior of a new class of nanostructured, low-temperature bainitic steels, where rotating bending fatigue tests were conducted on samples isothermally transformed at 300, 250, and 200 ℃, after which, fracture surfaces were examined using scanning electron microscopy. Results showed that, fatigue limits of about 820, 945, and 1,005 mPa were achieved for the samples transformed at each transformation temperature, respectively. moreover, according to the SEm micrographs, secondary crack initiation was observed in the high carbon retained austenite blocks for samples transformed at 300 ℃ and at the interface of blocky austenite-bainitic ferrite for samples transformed at 250 and 200 ℃.

关键词： Fatigue bainitic ferrite Retained austenite Fractography

Correlation of the meishucunian Stage in South Asia

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Acta Geologica Sinica(English Edition) 1989年第1期63卷 1-9页

作者： m.D.brasier b.Hamdi Department of Geology University of Hull Hull Hu6 7RX England. Geological Survey of Iran P. O. Box 1964. Teheran Iran.

The determination of boundary points and their correlation are prerequisites for defining the PrecambrianCambrian boundary and the intercontinental correlation. A large number of good Precambrian-Cambrian boundary sections in South Asia not only possess the conditions for selection of a boundary stratotype, but also provide the basis for the long-distance correlation of those boundary sections.Through a detailed study of the latest data obtained from the typical sections in South China, the Lesser Himalaya mountains and the Alborz mountains. the locations of boundary points have been defined, and a correlation scheme is proposed, which contributes to the solution of the problem of worldwide correlation of boundary sections.

关键词： Correlation of the meishucunian Stage in South Asia

Performance Enhancement of PV based boost Cascaded Fifteen Level Inverter for AC Loads

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Computer Systems Science & Engineering 2022年第7期42卷 165-181页

作者： m.P.Viswanathan b.Anand Department of Electrical and Electronics Engineering Hindusthan College of Engineering and TechnologyCoimbatore641032India

In this research work,single-stageﬁfteen levels cascaded DC-interface converter(CDDCLC)is proposed for sun arranged photovoltaic technology(PV)*** proposed geography is joined with help DC chopper and H-associate inverter to upgrade the power converter to accomplish the diminished harmonic proﬁ*** assessment with the customary inverter structures,the proposed system is used with diminished voltage stress,decreased switch count and DC source *** proposed research work with cascaded DC link conver-ter design requires three DC sources for combiningﬁfteen-level AC *** investigation structure switching technique is phase opposition and disposition pulse width modulation technique(POPD)which results in improved quality of obtained output AC power with 6.73%THD and also determinedly recommended for power converters used in UPS and drive applications since it is extremely affordable.A simulation and prototype model ofﬁfteen-level CDDCLC system is deployed and its performance is analyzed for various operating conditions.

关键词： Cascaded DClinkconverter(CDDCLC) modified phaseopposition and disposition(mPOPDPWm) photovoltaic(PV) DCinterfaceboostconverter

STAbILITY AND RESONANCES OF mULTISTEP COSINE mETHODS

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Journal of Computational mathematics 2012年第5期30卷 517-532页

作者： b. Cano m.J. moreta Departamento de matemdtica Aplicada IMUVA. Facultad de Ciencias. Paseo Belen 7 CP 47011 Valladolid Spain Departamento de Fundamentos del Andlisis Econdmico I. Universidad Complutense de madrid. Campus de Somosaguas Pozuelo de Alarcdn 28223 Madrid Spain

In a previous paper, some particular multistep cosine methods were constructed which proved to be very efficient because of being able to integrate in a stable and explicit way linearly stiff problems of second-order in time. In the present paper, the conditions which guarantee stability for general methods of this type are given, as well as a thorough study of resonances and filtering for symmetric ones （which, in another paper, have been proved to behave very advantageously with respect to conservation of invariants in Hamiltonian wave equations）. What is given here is a systematic way to analyse and treat any of the methods of this type in the mentioned aspects.

关键词： Exponential integrators multistep cosine methods Second-order partial dif-ferential equations Stability Resonances

Nonlinear static response of piezoelectric plates considering electro-mechanical coupling

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Journal of Central South University 2012年第5期19卷 1182-1188页

作者： b.behjat m.R.Khoshravan mechanical Engineering Department Tabriz UniversityTabrizIran

Nonlinear static analysis of piezoelectric plates has been carried out using nonlinear finite element method considering electro-mechanical coupling,The geometrical nonlinearity has been taken into account and electric potential is assumed to be quadratic across the plate thickness,The governing equations are obtained using potential energy and Hamilton's principle that includes elastic and piezoelectric *** finite element model is derived based on constitutive equation of piezoelectric material accounting for coupling between elasticity and electric effect using higher order plate elements,Results are presented for piezoelectric plate under different mechanical boundary conditions,Numerical results for the plate are given in dimensionless graphical *** of boundary conditions on linear and nonlinear response of the plate are also *** numerical results obtained by the present model are in good agreement with the available solutions reported in the literature.

关键词： piezoelectric plate nonlinear finite element method static analysis of plate geometrical nonlinearity