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Time filter

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Dalian, China

Dalian Polytechnic University is a university in Dalian, Liaoning. Wikipedia.


Zhang X.,Dalian University of Technology | Zhang X.,Dalian Polytechnic University | Quan X.,Dalian University of Technology | Chen S.,Dalian University of Technology | Yu H.,Dalian University of Technology
Applied Catalysis B: Environmental | Year: 2011

Graphene (Gr)/InNbO4 composite with visible light response was fabricated by a facile one-step hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and diffuse reflectance UV-vis spectra (DRS), respectively. The results indicated that InNbO4 particles with monoclinic type mainly distributed on the Gr sheet uniformly. The samples had good visible light response. Photocatalytic degradation of Methylene Blue (MB) was conducted under the visible light irradiation (>400nm) in order to evaluate the photoactivity of this photocatalyst. The kinetic constant of MB removal with Gr/InNbO4 (0.0346min-1) was 1.87 times that with InNbO4 (0.0185min-1). The enhanced photocatalytic performance of Gr/InNbO4 was attributed to the improved adsorption performance and the separation efficiency of the carriers. With Gr/InNbO4 as the photocatalyst the OH radicals be another type of oxidant in the photocatalytic process in addition to holes and electrons on Gr transporting from InNbO4 participated the oxidation of MB adsorbed on Gr. Overall, the result of this work could provide a new way of the construction of a visible-light-driven photocatalyst with high performance. © 2011 Elsevier B.V. Source


Deng T.-B.,Toho University | Qin W.,Dalian Polytechnic University
Signal Processing | Year: 2013

Although the coefficient-relation of the even-order sub-filters in the Farrow structure has been revealed and adopted in the weighted-least-squares (WLS) design of even-order finite-impulse-response (FIR) variable fractional-delay (VFD) digital filters in the literature, it has never been exploited in implementing low-complexity VFD filters. This paper aims topropose a low-complexity implementation structure through exploiting the coefficient-relation such that the coefficient-relation is not only utilized in the design process, but also utilized in the low-complexity implementation; formulate the minimax design of an even-order VFD filter through exploiting the coefficient-relation;propose a new two-stage scheme called increase-then- decrease scheme for optimizing the sub-filter orders so as to minimize the VFD digital filter complexity.With the above three advances, an even-order VFD filter can not only be designed and but also be implemented efficiently by exploiting the coefficient-relation. We will use a design example to illustrate the low complexity and high design accuracy. © 2012 Elsevier B.V. All rights reserved. Source


Deng T.-B.,Toho University | Qin W.,Dalian Polytechnic University
Signal Processing | Year: 2014

This paper presents a bi-minimax method for designing an odd-order variable fractional-delay (VFD) finite-impulse-response (FIR) digital filter such that both the peak errors of its variable frequency response (VFR) and VFD response can be simultaneously suppressed. The bi-minimax design iteratively minimizes a mixed error function involving both the VFR-peak-error and VFD-peak-error subject to the second-order-cone (SOC) constraints on the VFR errors and linear-programming (LP) constraints on the VFD errors. As compared with the existing SOC-based minimax design that minimizes the VFR-peak-error only, this odd-order bi-minimax design suppresses the VFD-peak-error and flattens both the VFR errors and VFD errors simultaneously. Consequently, both the two errors are made nearly equi-ripple (bi-equiripple). An example is given for showing the simultaneous suppression of the two kinds of peak errors and verifying the effectiveness of the odd-order bi-minimax design approach. © 2013 Elsevier B.V. Source


Guo L.,Dalian Polytechnic University
Multimedia Tools and Applications | Year: 2016

The main content of this paper is the embedded multimedia terminal circuit design and the research and implementation of video image correlation algorithm based on Embedded Multimedia processor. The specific research contents include the design of embedded multimedia design, driving circuit of embedded multimedia DSP and the real-time performance of the algorithm based on the DSP program design. In this paper, the design of multimedia terminal circuit embedded multimedia DSP based on FPGA structure, including the design, multimedia DSP driver design and implementation of video algorithm. The embedded multimedia terminal with embedded multimedia DSP and FPGA structure, multimedia DSP as the main control CPU, responsible for functions such as audio and video collection, video display, signal processing and network communication; FPGA is used to realize the control logic and VGA and composite video switching circuit and video format conversion function. The embedded multimedia terminal has two video input; a video VGA and composite video optional output; stereo audio input and output; Ethernet communication function. © 2016 Springer Science+Business Media New York Source


Chen L.F.,Dalian Polytechnic University
Advanced Materials Research | Year: 2013

Gadolinium-doped ZnO nanocrystalline powders were prepared by hydrothermal method using ionic liquid (1-heptyl-3-methyl imidazole bromide) as template. The crystal structure, grain size and optical properties of the samples were characterized by X-ray diffractometry, scanning electron microscopy and UV-Vis spectroscopy. The photocatalytic degradation of KN-R dye under simulated sunlight was chosen as a model reaction to evaluate the photocatalytic activities of the undoped and doped ZnO nanocrystalline catalysts. It was shown that Gadolinium was successfully doped into ZnO powders, and thus showing enhanced performance in degradation of KN-R. © (2013) Trans Tech Publications, Switzerland. Source

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