检索结果-南通市图书馆

All-Optical Switching between Optical Bistability and Multistability via Exciton Spin Relaxation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2015年第1期63卷 71-76页

作者： Asadpour Seyyed Hossein Rahimpour soleimani Hamid Department of physics University of Guilan

All-optical coherent control of optical bistability （013） and optical multistability （OM） in the 4.8 nm ZnSe single-quantum well based on excitons and biexciton transitions is investigated. By applying a pair of phase-locked laser pulses all-optical coherent control can be obtained. Theoretical analysis with density matrix and Maxwell equations then yield the optical bistability ~nd optical multistability. It is shown that by controlling the coherent and incoherent processes, the intensity threshold of OB and OM can be modified. Also, it is found that the switching between OB and OM or vice versa can be occurred for some controllable parameters.

关键词： optical bistability exciton spin relaxation quantum well nanostructure

Solubility prediction of disperse dyes in supercritical carbon dioxide and ethanol as co-solvent using neural network

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第4期24卷 491-498页

作者： Ahmad Khazaiepoul M. soleimani S. Salahi Faculty of Water and Environmental Engineering Shahid Beheshti University Tehran Iran Amol University of Special Modern Technologies Amo146168-49767 Iran Chemical Engineering Department Islamic Azad University Shahrood Branch Shahrood Iran

Nowadays artificial neural networkS （ANNs） with strong ability have been applied widely for prediction of non- linear phenomenon. In this work an optimized ANN with 7 inputs that consist of temperature, pressure, critical temperature, critical pressure, density, molecular weight and acentric factor has been used for solubility predic- tion of three disperse dyes in supercritical carbon dioxide （SC-C02） and ethanol as co-solvent. It was shown how a multi-layer perceptron network can be trained to represent the solubility of disperse dyes in SC-C02. Numeric Sensitivity Analysis and Garson equation were utilized to find out the degree of effectiveness of different input variables on the efficiency of the proposed model. Results showed that our proposed ANN model has correlation coefficient, Nash-Sutcliffe model efficiency coefficient and discrepancy ratio about 0.998, 0.992, and 1.053 respectively.

关键词： SolubilityDisperse dyesSupercritical carbon dioxideNeural networksCo-solvent

Assessment of seismic amplification factor of excavation with support system

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2019年第3期18卷 555-566页

作者： Hamidreza Tavakoli Saman soleimani Kutanaei Seyed Hossein Hosseini Department of Civil Engineering Babol University of Technology P.O. Box 484 Babol Iran Department of Civil Engineering Rouzbahan Institute of Higher Education Sari Iran Department of Civil Engineering Hamedan Branch Islamic Azad University P.O. Box 65181-15743 Hamedan Iran

Retaining walls have been used in many construction projects such as for road and inclined surfaces protection. The damage caused by an earthquake depends on the fundamental frequency, amplitude and the duration of the seismic motion. These parameters strongly depend on the seismic properties of the layers that are near the surface. In the study of retaining walls, in addition to the infl uence of soil, the infl uence of topography is also important. In the present study, site response analysis is performed by using fi nite element software pLAXIS to obtain the eff ect of various factors such as embedded length of the sheet pile, underground water table, length and angle of the nail, shear wave velocity of soil on site eff ect and dynamic response. Moreover, for better understanding of the eff ect of the above parameters, the stability analysis was performed by using shear reduction method. The results show that an increase in the embedded length of the sheet pile and the length of nailing causes an increase in the amplifi cation factor. Moreover, for shear-wave velocity in the range of 200- 600 m/s, the amplifi cation factor increases with increase of the shear-wave velocity due to the decrease of nonlinear behavior.

关键词： amplifi cation factor safety factor shear wave velocity nailing sheet pile

Stability results of properties related to the Bishop-phelps-Bollobás property for operators

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2021年第5期64卷 1011-1028页

作者： Maria D.Acosta Maryam soleimani-Mourchehkhorti Facultad de Ciencias Departamento de Analisis MatematicoUniversidad de GranadaGranada 18071Spain School of Mathematics Institute for Research in Fundamental Sciences(IPM)Tehran 19395-5746Iran

We prove that the class of Banach spaces Y such that the pair(l_(1),Y)has the Bishop-phelps-Bollobás property for operators is stable under finite products when the norm of the product is given by an absolute *** als... 详细信息

关键词： Banach space operator Bishop-phelps-Bollobás theorem Bishop-phelps-Bollobás property

phonon-dependent transport through a serially coupled double quantum dot system

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第5期23卷 510-515页

作者： M.Bagheri Tagani H.Rahimpour soleimani Department of physics University of Guilan

Using Keldysh nonequilibrium Green function formalism and mapping a many-body electron-phonon interaction onto a one body problem, the electron transport through a serially coupled double quantum dot system is analyzed. The influence of the electron-phonon interaction, temperature, detuning, and interdot tunneling on the transmission coefficient and current is studied. Our results show that the electron-phonon interaction results in the appearance of the side peaks in the transmission coefficient, whose height is strongly dependent on the phonon temperature. We have also found that the inequality of the electron-phonon interaction strength in two dots gives rise to an asymmetry in the current-voltage characteristic. In addition, the temperature difference between the phonon and electron subsystems results in the reduction of the saturated current and the destruction of the step-like behavior of the current. It is also observed that the detuning can improve the magnitude of the current by compensating the mismatch of the quantum dots energy levels induced by the electron-phonon interaction.

关键词： quantum dot electron-phonon interaction Keldysh nonequilibrium Green function formalism,current-voltage characteristic

phase Control of Transient Optical properties of Quantum-Dot Nanostructure via Terahertz Signal Radiation

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2014年第11期31卷 77-80页

作者： Seyyed Hossein Asadpour H. Rahimpour soleimani Department of physics University of Guilan Rasht Iran

We theoretically analyze the transient properties of a probe field absorption dispersion in a quantum-dot nanos- trueture driven by terahertz signal radiation. Here a four-level quantum-dot nanostructure is designed numerically by Schrodinger and poisson＇s equations. We show that in the presence of the THz signal, the medium becomes phase dependent and the absorption dispersion can be dramatically influenced by the relative phase between applied fields.

关键词： Quantum dots Nanostructured materials Submillimeter waves Schrödinger equation physics research

performance analysis of a tuned point absorber using SpH calm water and wave tank simulations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2024年第5期9卷 409-436页

作者： Kaveh soleimani Mohammad Javad Ketabdari Department of Maritime Engineering Amirkabir University of TechnologyTehranIran

In this paper,two smoothed particle hydrodynamics(SpH)models,namely SpH-W and SpH-C were used to evaluate the motion response of a point absorber wave energy converter(WEC).In the SpH-W model,a long wave flume was constructed and a long simulation was performed to obtain the motion response of the *** the SpH-C model,the SpH method is only used to find the hydrodynamic coefficients of the device by analysing a few seconds of free-decaying motion of WEC in calm water in a much smaller numerical ***,these coefficients were inserted in the equation of motion of a heaving WEC that was solved using a 4th order Runge-Kutta(ODE45)solver in ***,the energy conservation property of the WCSpH model was examined through a standing wave benchmark ***,the wavepoint absorber interaction was *** the simulation time for SpH-C model is much smaller than that of SpH-W,it gave almost similar results for the motion response of *** two models were used to evaluate the effects of the control force and the draft of a cone-cylinder point absorber on its hydrodynamic *** results showed that compared to the effect of the supplementary inertia,changes in the draft of the WEC have a small influence on its hydrodynamic *** buoy draft has an inverse relationship with both added mass and damping ***,increasing the supplementary mass increases the added mass and decreases the hydrodynamic damping coefficients.

关键词： point absorber power take-off Control forces SpH wave tank test SpH calm water test DualSpHysics

On the higher-order thermal vibrations of FG saturated porous cylindrical micro-shells integrated with nanocomposite skins in viscoelastic medium

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第8期18卷 1416-1434页

作者： Zeinab soleimani-Javid Ehsan Arshid Saeed Amir Mahdi Bodaghi Department of Solid Mechanics Faculty of Mechanical EngineeringUniversity of KashanKashanIran Department of Engineering School of Science and TechnologyNottingham Trent UniversityNottinghamNG118NSUK

Since the multi-layered structures are widely used nowadays, and due to interesting applications of cylindrical shells, this study is dedicated to analyzing free vibrational behaviors of functionally graded saturated porous micro cylindrical shells with two nanocomposite skins. Based on Biot's assumptions, constitutive relations for the core are presented and effective properties of the skins are determined via the rule of mixture. A sinusoidal theory is used to capture the shear deformation effects, and to account for the scale effects, the modified couple stress theory is employed which suggests a material length-scale parameter for predicting the results in small-dimension. With the aid of extended form of Hamilton's principle for dynamic systems, differential equations of motion are extracted. Fourier series functions are used to obtain natural frequencies and after validating them, a set of parametric studies are carried out. The results show the significant effects of porosity and Skempton coefficient, pores placement patterns, CNTs addition and distribution patterns, temperature variations, material length-scale parameter and viscoelastic medium on the natural frequencies of the microstructure. The outcomes of this work could be used to design and manufacture more reliable micro cylindrical structures in thermo-dynamical environments.

关键词： Vibration analysis Cylindrical shells Saturate porous materials Nanocomposite materials Carbon nanotubes Sinusoidal shear deformation theory Viscoelastic medium

Variability of Soil properties as Affected by Geological Formations in Southwestern Iran

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 244-245页

作者： Reza soleimani Agriculture and Natural Research Center

parent material is the most important soil forming ***,relation between geological forma- tion and soil properties was investigated in southwestern ***,geological formations of Asmari,

关键词： soil geological formations Iran