检索结果-南通市图书馆

Nonlinear Vibration Analysis of Functionally GradedNanobeam Using Homotopy Perturbation Method

在线全文

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2017年第1期9卷 144-156页

作者： Majid Ghadiri mohsen Safi Faculty of Engineering Department of MechanicsImam Khomeini International UniversityQazvinIran

In this paper, He’s homotopy perturbation method is utilized to obtainthe analytical solution for the nonlinear natural frequency of functionally gradednanobeam. The functionally graded nanobeam is modeled using the Eringen’s nonlocalelasticity theory based on Euler-Bernoulli beam theory with von Karman nonlinearityrelation. The boundary conditions of problem are considered with both sidessimply supported and simply supported-clamped. The Galerkin’s method is utilizedto decrease the nonlinear partial differential equation to a nonlinear second-order ordinarydifferential equation. Based on numerical results, homotopy perturbationmethodconvergence is illustrated. According to obtained results, it is seen that the second termof the homotopy perturbation method gives extremely precise solution.

关键词： Homotopy perturbation method Lindstedt-Poincare method analytical solution nonlocal nonlinear free vibration functionally graded nanobeam

A low-power high-throughput link splitting router for NoCs

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 Zhejiang University-Science A(Applied Physics & Engineering) 2008年第12期9卷 1708-1714页

作者： mohsen SANEEI Ali AFZALI-KUSHA Zainalabedin NAVABI Nanoelectronics Center of Excellence School of Electrical and Computer EngineeringUniversity of TehranTehranIran

In this paper, we propose a technique for lowering the latency of the communication in a NoC （network on chip）. The technique, which can support two qualities of service （QoS）, i.e., the guaranteed throughput （GT） and best effort （BE）, is based on splitting a wider link into narrower links to increase throughput and decrease latency in the NoC. In addition, to ease the synchronization and reduce the crosstalk, we use the l-of-4 encoding for the smaller buses. The use of the encoding in the proposed NoC architecture considerably lowers the latency for both BE and GT packets. In addition, the bandwidth is increased while the power consumption of the links is reduced.

关键词： Low-power Latency Throughput Network on chip (NoC) Delay-insensitive Router

Global stability and optim al control of a two-patch tuberculosis epidemic model using fractional-order derivatives

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2020年第3期13卷 1-27页

作者： Hossein Kheiri mohsen Jafari Faculty of Mathematical Sciences University of Tabriz TabrizIran

In this paper,we propose a fractional-order and two-patch model of tuberculosis(TB)epidemic,in which susceptible,slow latent,fast latent and infectious individuals can travel freely between the patches,but not under treatment infected individuals,due to medical *** obtain the basic reproduction number Ro for the model and extend the classical LaSalle's invariance principle for fractional differential *** show that if R0l,we obtain sufficient conditions under which the endernic equilibrium is unique and globally asymptotically *** extend the model by inclusion the time-dependent controls(effective treatment controls in both patches and controls of screening on travel of infectious individuals between patches),and formulate a fractional optimal control problem to reduce the spread of the *** numerical results show that the use of all controls has the most impact on disease control,and decreases the size of all infected compartments,but increases the size of susceptible compartment in both ***,also,investigate the impact of the fractional derivative order a on the values of the controls(0.7≤α≤1).The results show that the maximum levels of effective treatment controls in both patches increase when a is reduced from l,while the maximum level of the travel screening control of infectious individuals from patch 2 to patch 1 increases when o limits to 1.

关键词： Patch models fractional optimal control global stability tuberculosis epidemic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2021年第1期34卷 327-335页

作者： Roholah VAHDANI Hossein KHALEGHI BIZAKI mohsen FALLAH JOSHAGHANI Department of Electrical arid Computer Engineering Maleke Ashtar University of TechnologyTehran 1774-15875Iran

In this paper,a new correlated covariance matrix for Multi-Input Multi-Output(MIMO)radar is proposed,which has lower Side Lobe Levels(SLLs)compared to the new covariance matrix designs and the well-known multi-antenna radar designs including phased-array,MIMO radar and phased-MIMO radar *** is shown that Binary Phased-Shift Keying(BPSK)waveforms that have constant envelope can be used in a closed-form to realize the proposed covariance ***,there is no need to deploy different types of radio amplifiers in the transmitter which will reduce the cost,*** proposed design allows the same transmit power from each antenna in contrast to the phased-MIMO ***,the proposed covariance matrix is full-rank and has the same capability as MIMO radar to identify more targets,*** of the proposed transmit covariance matrix including receive beampattern and output Signal-to-Interference plus Noise Ratio(SINR)is simulated,which validates analytical results.

关键词： Beampattern Correlated MIMO radar Covariance matrix design Sidelobe level Signal-to-Interference Plus Noise Ratio(SINR)

Quantification of grain boundary effects on the geometrically necessary dislocation density evolution and strain hardening of polycrystalline Mg-4Al using in situ tensile testing in scanning electron microscope and HR-EBSD

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第5期12卷 1815-1829页

作者： Eunji Song mohsen Taheri Andani Amit Misra Department of Materials Science and Engineering University of MichiganAnn ArborMI 48109USA Department of Mechanical Engineering University of MichiganAnn ArborMI 48109USA Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA

In situ tensile testing in a scanning electron microscope(SEM)in conjunction with high-resolution electron backscatter diffraction(HR-EBSD)under load was used to characterize the evolution of geometrically necessary dislocation(GND)densities at individual grain boundaries as a function of applied strain in a polycrystalline Mg-4Al *** increase in GND density was investigated at plastic strains of 0%,0.6%,2.2%,3.3% from the area including 76 grains and correlated with(i)geometric compatibility between slip systems across grain boundaries,and(ii)plastic *** develop expressions for the grain boundary GND density evolution as a function of plastic strain and plastic incompatibility,from which uniaxial tensile stress-strain response of polycrystalline Mg-4Al are computed and compared with experimental *** findings in this study contribute to understanding the mechanisms governing the strain hardening response of single-phase polycrystalline alloys and more reliable prediction of mechanical behaviors in diverse microstructures.

关键词： Mg-Al alloys Grain boundaries Geometrically necessary dislocations Strain gradient plasticity HR-EBSD

Optimal control of a fractional-order model for the HIV/AIDS epidemic

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2018年第7期11卷 59-81页

作者： Hossein Kheiri mohsen Jafari Faculty of Mathematical Sciences University of Tabriz TabrizIran

In this paper,we present a general formulation for a fractional optimal control problem (FOCP),in which the state and co-state equations are given in terms of the left fractional *** develop the forward-backward sweep method (FBSM)using the Adamstype predictor-corrector method to solve the *** present a fractional model for transmission dynamics of human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS)with treatment and incorporate three control efforts (effective use of condoms,ART treatment and behavioral change control)into the model aimed at controlling the spread of HIV/AIDS *** necessary conditions for fractional optimal control of the disease are derived and *** numerical results show that implementing all the control efforts increases the life time and the quality of life those living with HIV and decreases significantly the number of HIV-infected and AIDS ***,the maximum levels of the controls and the value of objective functional decrease when the derivative order a limits to 1(0.7≤a <1).In addition,the effect of the fractional derivative order a (0.7≤a <1)on the spread of HIV/AIDS epidemic and the treatment of HIV-infected population is *** results show that the derivative order a can play the role of using ART treatment in the model.

关键词： Fractional optimal control diseases modeling numerical simulation HIV/AIDS dynamics

Complementary Inequalities to Improved AM-GM Inequality

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第12期33卷 1609-1616页

作者： Hamid Reza MORADI mohsen Erfanian OMIDVAR Department of Mathematics Mashhad Branch Islamic Azad University Mashhad Iran

Following an idea of Lin, we prove that if A and B are two positive operators such that 0 〈 mI 〈 A 〈 m＇I ≤ M＇I ≤B 〈 MI, then Ф^2（A＋B/2）≤K^2（h）/（1＋（logM＇/m＇）^2/8）^2Ф^2（A#B）,and Ф^2（A＋B/2）≤K^2（h）/（1＋（logM＇/m＇）^2/8）^2（Ф（A）#Ф（B））^2,where K（h） = （h＋1）2 /4h and h = M and Ф is a positive unital linear map.

关键词： Operator inequalities positive linear maps operator norm Kantorovich inequality Wielandt inequality

Loss of offsite power (LOOP) accident analysis by integration of deterministic and probabilistic approaches in Bushehr-1 VVER-1000/V446 nuclear power plant

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第5期33卷 39-52页

作者： mohsen Esfandiari Gholamreza Jahanfarnia Kamran Sepanloo Ehsan Zarifi Department of Nuclear Engineering Science and Research BranchIslamic Azad UniversityTehranIran Reactor and Nuclear Safety School Nuclear Science and Technology Research Institute(NSTRI)TehranIran

The results of an accident analysis for the loss of offsite power(LOOP)scenario in a reference Bushehr-1 VVER-1000/V446 nuclear power plant(NPP)are presented in this *** study attempted to provide a better analysis of LOOP accident management by integrating deterministic and probabilistic *** RELAP5 code was used to investigate the occurrence of specific thermal–hydraulic *** probabilistic safety assessment of the LOOP accident is presented using the SAPHIRE *** accident data were extracted from the Bushehr NPP final safety analysis reports and probabilistic safety analysis reports.A deterministic approach was used to reduce the core damage frequency in the probabilistic analysis of LOOP *** probabilistic approach was used to better observe the philosophy of defense in depth and safety margins in the deterministic analysis of the LOOP *** results show that the integration of the two approaches in LOOP accident investigations improved accident control.

关键词： Loss of offsite power Deterministic Probabilistic Integration RELAP5 SAPHIRE

New results for a Lasota-Wazewska model

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2019年第2期12卷 143-162页

作者： Farouk Cherif mohsen Miraoui MaPSFA LR11ES35ISSATUniversity of Sousse4002 SousseTunisia IPEIK University of Kairouan3100 KairouanTunisia LR11ES53Faculty of Sciences of Sfax University of SfaxTunisia

In nature there is no phenomenon that is purely periodic,and this gives the idea to consider the measure pseudo almost periodic *** this paper,by employing a suitable fixed point theorem,the proper ties of the measure pseudo almost periodic functions and differential inequality,we investigate the existence and uniqueness of the measure pseudo almost periodic solutions for some models of Lasota-Wazewska equation with measure pseudo almost periodic coefficients and mixed *** suppose that the linear part has almost periodic and the nonlinear part is assumed to be measure pseudo almost ***,the global attractivity and the exponential stability of the measure pseudo almost periodic solutions are also considered for the *** application,an illustrative numerical example is given to demonstrate the effectiveness of the obtained results.

关键词： Lasota Wazewska model measure pseudo almost periodic function fixed point theorem