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International Journal of Hydromechatronics (7 papers in press)
Temperature dependence of the states of interface and energy distributions of Au/n-type GaAs Schottky Structures by ?ükrü KARATA?, Ya?ar ASLAN Abstract: The purpose of this paper is to characterise states density of interface of Au/n-type contacts of GaAs Schottky over a wide temperature range. Temperature dependent of the distribution of energy of states density of interface (NSS) profile calculated by the characteristics of forward bias I-V. The heights of barrier calculated by C2-V plots at high frequency reduced linearly with enhancing temperature. It is found that the mean NSS enhances with the temperature enhancing. The results present that states densities of interface are very significant parameters that affects the electrical properties of Au/n-GaAs diodes of Schottky. Keywords: Temperature dependence; Au/GaAs structures; interface states density; Schottky contacts. DOI: 10.1504/IJHM.2019.10021515
The influence of pressure difference at the valve port of hydraulic throttle cone valve on the luminescence of hydraulic oil by Bosong Duan, Jihai Jiang, Che Mingyang, Zhang Jian, Hu Zhidong Abstract: In the hydraulic system, when the hydraulic oil flows through the valve port and the pressure difference between the front and back of the valve port is large, a large number of bubbles will be produced, and the phenomenon of luminescence of hydraulic oil may even occur. In this paper, the influence of the pressure difference before and after the port of the hydraulic throttle cone valve on the luminescence of hydraulic oil is studied using simulation analysis and experiments. It is found that, with the increase of pressure difference, the luminescence phenomenon of hydraulic oil becomes more obvious. Keywords: hydraulic oil; throttle cone valve port; luminescence; bubble; pressure difference. DOI: 10.1504/IJHM.2019.10021516
Buckling analysis of piezoelectric cut out nanoplates using numerical method by Kong Fah Tee, Reza Kolahchi Abstract: Buckling analysis of the nanocomposite piezoelectric nanoplate with cut out resting in elastic foundation is presented in this article. In order to enhance mechanical properties of nanoplate with central cut out, carbon nanotubes (CNTs) are distributed as uniform distribution (UD) through thickness. For defining the shape function of cut out, the domain decomposition method and orthogonal polynomials are used. At last, to obtain critical buckling load of system, Rayleigh-Ritz method is provided. The impacts of the length and width of nanoplate, dimension of square cut out and elastic medium on the piezoelectric nanoplate are presented in this study. The results show that considering cut out in nanoplate, the buckling load is decreased. Keywords: Analytical buckling; Nanoplate; Central square hole; Winkler foundation; Domain decomposition method; Rayleigh-Ritz method. DOI: 10.1504/IJHM.2019.10021517
Telescopic Shearing of Non-Newtonian Fluids with a Saturation Stress by Sergei Alexandrov, Elena Lyamina, Van Manh Dinh, Dinh Kien Nguyen Abstract: A closed form solution for quasi-static telescopic shearing of non-Newtonian fluids between two concentric cylinders is derived and then analysed. The paper focuses on qualitative features of the solution. In particular, it is shown that the qualitative behaviour of the solution in the vicinity of the inner friction surface is controlled by the dependence of the quadratic invariant of the stress tensor on the quadratic invariant of the strain rate tensor as the latter approaches infinity. In particular, no solution at sticking may exist if the quadratic invariant of the stress tensor approaches a finite value as the quadratic invariant of the strain rate tensor approaches infinity. In this case, it is necessary to construct the solution at sliding. This solution is singular, and the exact asymptotic representation of the quadratic invariant of the strain rate tensor in the vicinity of the friction surface depends on the exact dependence of the quadratic invariant of the stress tensor on the quadratic invariant of the strain rate tensor as the latter approaches infinity. Keywords: sticking; sliding; singularity; saturation stress; non-Newtonian fluids. DOI: 10.1504/IJHM.2019.10021518
Numerical method for frequency response in visco-embedded nanoplate by M. Cinefra Abstract: Numerical solutions for frequency analysis of smart classic nanoplates located at viscoelastic medium are discussed by developing the Galerkin distributed strip transfer method of function. Utilising the non-local theory for piezoelectric materials and principle of Hamilton, the final equations and boundary conditions are first obtained, where external electric voltage, viscoelastic foundation, piezoelectric effect and non-local effect are considered simultaneously. Subsequently, the numerical method is developed to solve the final equations for the frequencies. Results from the model are also indicated to show the influences of non-local and viscoelastic medium and geometric dimensions on vibration responses of the plate. Keywords: Nonlocal piezoelectric plates; Vibration characteristics; Viscoelastic foundation. DOI: 10.1504/IJHM.2019.10021519
Analysis of buckling in concrete beams containing nanoparticles utilizing numerical approach by Mohsen Nasihatgozar Abstract: The buckling analysis of concrete beam containing silica oxide (SiO2) nanoparticles is investigated by Timoshenko beam model. The agglomeration effects are assumed by Mori-Tanaka approach. The beam is located in soil medium with spring and shear elements. The final equations are derived by Hamiltons principle and energy method. The equations are solved by a numerical approach and the buckling load is calculated and the influence of nanoparticles agglomeration and percent as well as geometrical parameters of the beam are investigated. The results show that the agglomeration of nanoparticles can reduce the buckling load of the beam. Keywords: Buckling of beam; Agglomeration of nanoparticles; Numerical approach; SiO2. DOI: 10.1504/IJHM.2019.10021763
Development of a novel Measurement and actuation system for a high pressure falling body viscometer by Marcel Rückert, Olivier Reinertz, Katharina Schmitz Abstract: The paper deals with the development of a novel electromechanical system for actuation and position measurement inside a high pressure falling body viscometer. The measurement principle of falling body viscometers is introduced. After a literature review on electromechanical systems used in such viscometers and state of the art stroke sensors, a novel principle is deduced aiming at higher measurement accuracy and smallest building space. After the explanation of the necessary electronics and data processing for the designed system, the paper concludes with experimental results showing the achieved high resolution and accuracy of the measurement system as well as some sample measurement results of the high pressure falling body viscometer. Keywords: Viscometer; Flux simulation; LVDT; High pressure; Electro-magnetic system design; sensor actuator fusion. DOI: 10.1504/IJHM.2019.10021765