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Simulation of graphene-GaAs Schottky junction solar cell with graphene gate is performed by using finite difference method. Poisson and driftdiffusion equations are solved self-consistently to capture carrier dynamics in the solar cell. Our algorithm is verified by comparing with experimental results. The Schottky barrier between graphene and GaAs can be tuned by graphene gate, and hence the open...
The emergence of virtual reality technology enriches people's entertainment life. In the virtual world, we can have a full immersion of sensory experience in shopping, traveling, playing games and watching movies. However, just the same as many other human-computer interaction technologies, the use of virtual reality also leads to various issues in security and privacy, further brings ethical issues,...
Memory is very important in the present era of Internet of Thing (IoT) and Big Data, while Resistive Random Access Memory (RRAM) is a key member in the family of non-volatile memory. However, in the development of high density RRAM memory array, self-heat effect (SHE) as well as thermal crosstalk must be understood and controlled during its operation. In this paper, simulation of electrothermal effects...
Electrothermal characterization of the advanced SOI FinFETs is performed in this paper, which is based on some analytical equations as well as in-house developed finite difference algorithm. The temperature-dependent properties of thermal conductivities of all materials involved are considered in our simulation, with results validated by the commercial software ANSYS and other analytical solution...
Monolayer MoS2 photodetectors are modeled and simulated by self-consistently solving diffusive transport equations in the presence of light illumination with the two-dimensional (2-D) Poisson equation. The simulated results indicate that very high photoresponsivity (PR) of ∼1000A/W observed in others' experiments is due to strong electrostatic effect of pile up of optically generated holes, and efficient...
The clutter removal is a vital procedure in the target detection with Ground-Penetrating Radar (GPR). In this paper, we present morphological component analysis (MCA) based clutter removal method adapted to the migrated data. Firstly, the received B-scan data is migrated by using phase-shift migration method. In the migrated B-scan, the clutter appears as horizontal stripes and the hyperbolic reflecting...
A FDTD method with the conformal modification is proposed to study electromagnetic properties of multilayer graphene (MLG). The vector fitting technique is employed to change the MLG conductivity model into an appropriate form for the FDTD implementation by an auxiliary differential equation formulation. Some numerical results are presented with the accuracy of our developed algorithm validated by...
In this paper, vertically aligned single-walled carbon nanotube (SWCNT) contacted phase change memories are modelled and simulated by three-dimensional time-dependent finite element method (TDFEM). Thermal coupling between adjacent cells, which can cause current leakage and reliability degradation, is studied for different variations in space caused by fabrication process. In particular, thermal response...
In order to overcome the disadvantages of boarding bridge's collapse and scraping the plane without early warning, a design of wireless fault early warning and monitoring system combining ZigBee wireless communication technology and variable sensors which are used to detect vibration, position, and faults, was proposed. The structure of network, the design of hardware and the software modules of the...
In this paper, we introduce the l1/2 constraint into the morphological component analysis (MCA) to solve the problem of cartoon and texture separation, inpainting and super-resolution for images. The newly proposed iterative half thresholding algorithm is recast in an analysis formulation, and can be well embedded in the MCA framework. Other constraint, such as total variation (TV), can also be combined...
The recent progress of compressive sensing (CS) theory shows that perfect reconstruction is possible when the data are sampled randomly and compressed greatly. This revolutionary theory strongly advocates the irregular sampling pattern in the process of seismic data acquisition, leading to a highly reduced acquisition cost. The complete seismic record can be reconstructed from the sparsely few sampled...
This paper is on the use of the framelet transformation for noise surpression of geophysical data. The main contribution lies in the application of the transformation for geophysical data. The results of the proposed approach are compared to the use of f−x deconvolution filtering and the curvelet transformation for the same purpose on seismic data. Visually, an improvement in noise reduction is detected.
With the development of seismic attribute analysis technique, the fidelity of waveform and amplitude becomes important to wavefield separation method. In this paper, we present a zero-offset vertical seismic profiling (VSP) wavefield separation method with good fidelity. The method is based on singular value decomposition(SVD) filtering and have four stage: first, aligning events of downgoing wave...
In ground-penetrating radar (GPR) surveys, the GPR data are always contaminated by high-amplitude clutter noise which consists of the director transmitter to receiver signal (also called crosstalk) and antenna ringdown. The crosstalk and antenna ringdown overlay severely the shallow reflection signals. The commonly used approach to filter out the clutter noise is to subtract the mean trace which can...
We propose a seismic discontinuities detecting method based on wavelet transform in this paper. First we do 1DCWT to seismic cube to obtain instantaneous phase cubes for three interested scale. Then we use 3D CWT as a novel tool to detect seismic discontinuities on these three instantaneous phase cubes. The result on synthetic signal and real field data show our method's depicting ability of large...
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