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According to our former investigation on space charge properties of two layers of oil-impregnated-paper and oil, the interface charge between oil and paper showed different properties with Maxwell-Wagner theory in which macroscopic conductivity and permittivity were only taken into consideration. It is assumed that the charge barrier existing at interface was responsible for the interfacial charge...
In order to investigate the distributed semiconductor device high frequency operation, we are developing a 2D/3D time-domain electromagnetic physical simulator. It is based on a self-consistent solution of both the Maxwell equations and the free carrier macroscopic conservation equation sets issued from the Boltzmann general transport equation. Its large potential application field presently concerns...
A novel algorithm for a reduction of the computational burden associated to the time-dependent simulation of quantum transport with pure states is presented. The algorithm is based on using the superposition principle and the analytical knowledge of the free timeevolution of an initial state outside of the active region, together with absorbing layers. It is specially suited to study (many-particle...
A discretization method is proposed for continuous-time, non-autonomous, and nonlinear systems. The concept of continualization is used to derive a sufficient condition for a given discrete-time system to be an exact discretization of a continuous-time system. The proposed discretization method is based on an approximate solution to this condition, which is computed using Peano-Baker series. As an...
Partial trade credit is widely used in practice since there exit distinctions between trading partners in financial status, the level of cooperation and negotiation power etc. In this paper, we consider a periodic-review inventory control problem where a retailer with cash flow constraints sells a single product to the market with random demand. In each period, the retailer, offered partial trade...
Heat exchangers are thermal fluid systems that are basic components in many industrial devices. Heat exchangers are modeled by coupled hyperbolic and parabolic partial differential equations and the structure of these equations depends on the geometry of the heat exchanger. In this paper we consider approximation methods for optimal control of a counter flow heat exchanger. We show the system is well-posed...
This paper presents an analytic dynamic model and a geometric numerical integrator for spacecraft with reaction wheel assemblies. According to Lagrangian mechanics on an abstract Lie group, Euler-Lagrange equations are derived without any restrictive assumptions on the configuration of reaction wheels. This yields the most generalized reaction wheel dynamic model, that can possibly include the effects...
The automatic management of barrage controlled river segments tries to ensure easy and safe navigation and at the same time suppress large water discharge variations. The predominant local PI based control solution used in Moselle river barrages can only guarantee a steady water level at the cost of possibly amplifying inflow disturbances. To balance these contradicting goals, a model predictive controller...
This paper presents the real time modeling of a proton exchange membrane fuel cell stack using two different real time platforms: RT-Lab and dSPACE. Simulation results are compared with a 500 W fuel cell and show very good agreement with experimental results. The model is suitable for real time simulation which is a key issue in many applications such as hardware in the loop applications (HIL). Indeed,...
In this study we present a Porchet infiltrometer experiment monitored by a Ground Penetrating Radar (GPR). The modeled radargram is compared with experiment and a first step into retrieving hydraulic parameters is shown. The experiment was carried out in a quarry of Fontainebleau sand, using a Malå RAMAC system with antennae centered on 800 MHz. Numerical models of the infiltration were made using...
The vane support system (VSS) causes less distortion to the rear fuselage. It is an ideal support mechanism for large aircraft wind tunnel tests. Investigating on its support interference will contribute much to the conduction and development of VSS tests. This paper presents a numerical investigation on the support interference of VSS in high speed wind tunnel using Ty154 model. CFD results are compared...
The present work is a sequel of our paper [1] where a Bayesian unnormalised smoother was proposed for the so-called class of partially observed reciprocal chains (RC). Within this Bayesian setting, an issue remained unsolved concerning practical implementation due to the unnormalised feature of the smoother. Here a normalised Bayesian smoother is developed for a class of signals even more general...
Collaborative spectrum sensing in Cognitive Radio Networks is vulnerable to Spectrum Sensing Data Falsification (SSDF) attack. Many existing SSDF attack defending algorithms need the assistance of reference sensing devices with high spectrum sensing performance, which are difficult and costly to be implemented in reality. Most of other existing approaches are based on statistic characteristics of...
The article gives a general analysis of the most common international practice models of electromagnetic processes disadvantages in current transformers. On the basis of these results, the authors have proposed more simpler and practical mathematical models and algorithms. These models make it possible to consider the residual magnetic induction in the current transformer, to determine all the necessary...
Random dense deployment of heterogeneous networks (HetNets), consisting of macro base stations (BS) and small cells (SC), can provide higher quality of service (QoS) while increasing the energy efficiency of the cellular network. In addition, it is possible to achieve lower deployment cost and, therefore, maximize the benefits for the network providers. In this paper, we propose a novel method to...
A simple control model for beam in RFQ channelis considered. This model is based on the previously developed approach [1]and allowsto perform optimization of the RFQ channelin acceptable time.1. O.I. Drivotin, D.A. Ovsyannikov. Modelingof high intensity charged particle beams. St. Petersburg, St. Petersburg State Univ., 2003.
In frequency reuse one networks, the inter-cell interference (ICI) is severe especially for cell edge user equipments (UEs). Statistical information of ICI is helpful to design interference mitigation schemes. This paper proposes a statistical model for the uplink ICI in orthogonal frequency division multiple access (OFDMA) networks with power control. The distance-dependent attenuation and correlated...
Using TK-2D software, a 2-D tidal current numerical model of Zhanjiang Bay is set up. On the basis of model verification, numerical simulation of tidal current field is carried out, and a reclamation project to the north of Donghai Island is numerically simulated. According to the simulation results, the tidal current characteristics of Zhanjiang Bay are analyzed and the feasibility of the reclamation...
A three-dimensional numerical model has been developed in the present paper with an aim to simulate suspended sediment transport under waves and currents. The modelling system consists of two coupled model components: (i) the NS equations for the hydrodynamic model, including wave effects, (ii) the advection-diffusion equation for the suspended sediment transport model. In this work, the derivation,...
In this paper we use a numerical simulation to analyze the time evolution of the net spin magnetization in diffusion weighted MRI. We compare the integer and fractional cases by simulating the Bloch-Torrey equation for several different types of gradient pulses. This generalization of the diffusion process is based on the Continuous Time Random Walk (CTRW) model, where the order of the fractional...
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