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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Theoretical Derivation of the Kramers-Kronig Relationship Based on the Fourier Transform SU Hongmei Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 48-51.   DOI: 10.13438/j.cnki.jdzk.2022.03.008 Abstract （653）      PDF（pc） （323KB）（448）       Knowledge map    Save From the causal law of physical experimental facts,without concrete microscopic physical model, this paper discusses the physical mechanism and theoretical derivation of the Kramers-Kronig relationship based on Fourier transform,dispersion theory,and residue theorem. Reference | Related Articles | Metrics | Comments（0） Select Design of Controller for Pure Electric Bus Based on STM32 WANG Guoyi, YUAN Tao, YU Xingguo, LI Hao Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 52-56.   DOI: 10.13438/j.cnki.jdzk.2022.03.009 Abstract （437）      PDF（pc） （610KB）（244）       Knowledge map    Save A pure electric bus controller based on STM32 is designed through analyzing the function and running state of pure electric bus control. The function of each module of the controller is analyzed,and the power supply circuit and voltage detection circuit are designed. The controller adjusts the speed of the DC motor through outputting pulse width modulation with different duty cycles.The information collected by the sensor is transmitted to the microprocessor in real time through the CAN bus,and the microprocessor analyses the collected information and sends commands through CAN bus to control the running state of the bus safely,accurately and in real time. Reference | Related Articles | Metrics | Comments（0） Select Dynamical Dissipative Cooling of a Cavity Opto-Mechanical Oscillator MI Xian-Wu, LI Xiu-Hong journal6    2015, 36 (1): 21-27.   DOI: DOI:10.3969/j.issn.1007-2985.2015.01.007 Abstract （2254）      PDF（pc） （811KB）（1253）       Knowledge map    Save The dynamical cooling process of a cavity opto-mechanical system is investigated by a master equation.The mean phonon number is calculated using the covariance approach.Firstly,the effect of different cavity dissipation rate on the mean phonon number is discussed in the strong coupling system.Then the variation of mean phonon number changing with different parameters in the weak and strong coupling system is compared.For strong coupling regime,the mean phonon number oscillates periodically with the increase of coupling strength and it decreases fast as the cavity dissipation rate increases.Finally,it reaches a cooling limit.In the weak coupling regime,the mean phonon number increases fast as the cavity dissipation rate increases and it reaches equilibrium in the end. Reference | Related Articles | Metrics | Comments（0） Select Algorithm for Detecting Feature Points of Circle Image LI Piao, YANG Tian-Long, LIAO Jian-Guo, ZHAO Qian-Cheng journal6    2015, 36 (1): 28-34.   DOI: DOI:10.3969/j.issn.1007-2985.2015.01.008 Abstract （2943）      PDF（pc） （1134KB）（2548）       Knowledge map    Save In order to improve the accuracy and stability of circular image feature point detection,an algorithm is put forward based on the gray-scale symmetry of circular image center.Through this algorithm,the edge of circular image is firstly detected by Sobel operator;then gray-scale qualitative method is used to determine the center of the circular image;and finally gray-scale symmetry factor is introduced to obtain the sub-pixel coordinates of the feature points of circular image.Projection simulation experiment and measuring experiment are adopted to evaluate the precision of this algorithm,and the experiment results show that the precision of this method is around 0.2 pixels. Reference | Related Articles | Metrics | Comments（0） Select Logistics Information Management System Based on Android Mobile Platform LI Ying-Jiu journal6    2015, 36 (1): 35-39.   DOI: DOI:10.3969/j.issn.1007-2985.2015.01.009 Abstract （2685）      PDF（pc） （3107KB）（1955）       Knowledge map    Save Android mobile intelligent device platforms are applied to logistics procedure.A logistics routing planning algorithm based on mobile platforms is proposed.A corresponding logistics information management system is researched and implemented.The logistics information is collected，saved，transferred，identified，tracked and queried using wireless mobile access and electronic map provided by Android system.This method can control logistics procedure of vehicle and cargo，achieving efficiency and cost reduction. Reference | Related Articles | Metrics | Comments（0） Select Multi-scale Retinex Algorithm for the Foggy Image Enhancement Based on Sub-band Decomposition SHU Ting, LIU Yao-Feng, DENG Bo, TAN Ya-Peng, CHEN Bing-Quan journal6    2015, 36 (1): 40-45.   DOI: DOI:10.3969/j.issn.1007-2985.2015.01.010 Abstract （3024）      PDF（pc） （3547KB）（1495）       Knowledge map    Save A kind of Multi-Scale Retinex (MSR) algorithm based on sub-band decomposition for image enhancement was proposed.First,the improved MSR algorithm was used to deal with the foggy image.Then,the gain of the different foggy image was obtained by the sub-band decomposition method.After that,the clear and enhanced image was obtained by the image fusion technology.At the same time,the simulation results of the algorithm was analyzed by using the mean value,standard deviation,entropy and mean square error (MSE) and peak signal-to-noise ratio (PSNR).The simulation and evaluation results show that the contrast of image is increased,the useful information of the original image is retained,the degree of distortion is small,and the clarity of the image can be improved. 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