Papers by Keyword: Hopping Model

Abstract: The Monte Carlo approach is used to calculate carrier mobility in molecular copper phthalocyanine (CuPc) with applied electric field in the range of 0.5 to 20 × 10³ kV/cm. Density functional theory (DFT) is employed to derive the molecular interaction between neighboring molecules with various applied electric fields. The result of DFT calculation to evaluate transfer integral that used to calculate hopping rate in the range of applied electric fields. The charge transfer rate between adjacent molecules can be estimated by using the Marcus–Levich–Jortner (MLJ) formalism. The charge is assumed to be localized on the donor and then transferred to the acceptor. Tunneling is modeled by including selected vibration modes at the quantum mechanical level. The result of hopping rate is in ordered of 10¹⁵ s^-1 for hole hopping in direction of applied electric field on the contrary hopping rate in ordered of 10¹⁴ s^-1. The result of mobility can be calculated in range of 0.44 - 10.0 cm²/Vs decrease as a function of applied electric field that calculated by simple hopping model.

Abstract: In this study, we present the effects of design parameters on the performance of a hopping robot. In particular, we focus on the effects of torsional stiffness and preload on a hopping model with two-segment legs having passive knee joints with torsional stiffness. One of the objectives for a field robot is the ability to travel quickly with energy efficiency [1]. Therefore, it is important to determine what range of each design variable is proper to realize not only the high forward speed for great mobility, but also the low torque consumption for energy efficiency. Accordingly, we describe both the analogy simulation of a hopping gait with two-segment legs and the results of this simulation.

Abstract: We propose a multi-element hopping model, which shows the flux equations of various cations under high electric field. The model is applied to the initial oxidation of binary alloys which produces a homogeneous single layer solid solution oxide film. The flux equations by this model for two kinds of cations were substituted to the oxidation growth rate definition equation. Finally, it is shown that the initial oxidation rate law of dilute binary alloys can be obtained as a type of inverse logarithmic rate law.