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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Quantitative Analysis of Thermal Performance Parameters of Layered Semiconductors MoSe2 and WSe2 PENG Chun, YANG Xuexian, HUANG Yonggang, WANG Xiaoyun, PENG Jinzhang Journal of Jishou University(Natural Sciences Edition)    2020, 41 (5): 32-36.   DOI: 10.13438/j.cnki.jdzk.2020.05.007 Abstract （682）      PDF（pc） （1380KB）（336）       Knowledge map    Save Based on bond order-length-strength theory and local bond average approach, the thermal parameters of the transition metals MoSe2 and WSe2 were quantitatively analyzed, and the functional relations of thermal expansion coefficient (TEC), lattice constant, thermal strain and temperature were established.It reveals the physical mechanism of the temperature effect of the thermal parameters of the layered semiconductor material: TEC is directly proportional to the Debye temperature and specific heat capacity, and is inversely proportional to the atomic cohesive energy. The lattice constant, thermal strain and temperature are linear when the temperature is higher than one third of the material's Debye temperature. Debye temperatures of MoSe2 and WSe2 were 276, 260 K. Reference | Related Articles | Metrics | Comments（0） Select Image Registration Based on Spatial Adaptive Total Variation ZHANG Qunyi, YANG Fenlin Journal of Jishou University(Natural Sciences Edition)    2020, 41 (5): 37-40.   DOI: 10.13438/j.cnki.jdzk.2020.05.008 Abstract （808）      PDF（pc） （489KB）（297）       Knowledge map    Save A discrete spatially adaptive total variation image registration model is established by introducing spatial adaptive regularization parameters, and an effective fixed point method is given by combining the first-order Taylor expansion. Experimental results show that the image obtained from the spatial adaptive total variation registration model has better quality and requires less iterative time than the total variation registration model. Reference | Related Articles | Metrics | Comments（0） Select A New Discrete TVp Model PENG Ying, YANG Fenlin Journal of Jishou University(Natural Sciences Edition)    2020, 41 (5): 41-44.   DOI: 10.13438/j.cnki.jdzk.2020.05.009 Abstract （848）      PDF（pc） （1515KB）（313）       Knowledge map    Save The adaptive TVp model can effectively avoid the staircase effect of TV model, but the nonlinear degree of the model is relatively high, so it is difficult to solve it. In order to solve this problem, a new discrete TVp model is established by using the geometric mean of the forward and backward difference of the gradient of each pixel to define the gradient mode of the pixel. The model can effectively reduce the nonlinear degree of TVpmodel, and the image recovered has better quality and higher signal-to-noise ratio than the TVp model. Reference | Related Articles | Metrics | Comments（0） Select Spectral Line Absence about Grating Diffraction YE Fu-Qiu, PENG Shan-Qiong journal6    2014, 35 (3): 44-48.   DOI: 10.3969/j.issn.1007-2985.2014.03.010 Abstract （3539）      PDF（pc） （455KB）（2406）       Knowledge map    Save With incident light of  different angles,the conditions for the phenomenon of spectral line absence occuring and being observed are theoretically deducted.By the means of numerical simulation,the condition for the phenomenon of spectral line  absence under the vertical incidence  is verified.And  with incident light of with different angles the spectral line  absence   is compared.The results show that the phenomenon meets  j=kd/b.The difference between the two incidences is that the observed range of the spectral line’s absence striation is different to some extent under the same experimental conditions. Reference | Related Articles | Metrics | Comments（0） Select The Design of Visual Attendance Management System Based on Web LI Yu journal6    2014, 35 (3): 49-53.   DOI: 10.3969/j.issn.1007-2985.2014.03.011 Abstract （3094）      PDF（pc） （1039KB）（2322）       Knowledge map    Save The architecture design pattern of attendance data visualization is be given in this paper,and the attendance information in Web system was real-time rendering outputted by modifying the calendar chart controls of ExtJS framework.By using the technique of combining JavaScript and ExtJS,the Web visualization problems of students training attendance in Security Training Management Platform have been solved. Reference | Related Articles | Metrics | Comments（0） Select Crop Pest Monitoring and Warning System Based on SOA WANG Qing-Ren, PENG Qiong-Qiong, WU Yun-Zhi, GU Li-Chuan, LIU Ping, LE Yi, ZHANG You-Hua journal6    2014, 35 (3): 54-58.   DOI: 10.3969/j.issn.1007-2985.2014.03.012 Abstract （2886）      PDF（pc） （397KB）（1986）       Knowledge map    Save Crop pests and diseases monitoring and forecasting is an important part of the key to agricultural disaster prevention and mitigation,and to ensure that effective supply of major agricultural products.At present,it is widespread phenomenon that the accuracy and timeliness of work pest monitoring and early warning is greatly restricted because of “Information isolated island”.“AHP-based CBR Warning Decision” model was proposed,which using Web Service technology,designed and developed a monitoring and warning system based on SOA structure in Anhui Crop pests and diseases,and put it into application.This early warning system has achieved collecting standardized,transmission networking,analysis standardized,graphical processing,publishing visualization,reporting institutionalized,management automation,intelligent decision-making of Anhui crop pest data work.The practical result of six years showed significant efficiency at all levels of Anhui plant protection stations,in terms of accuracy and timeliness of decision-making in early warning. Reference | Related Articles | Metrics | Comments（0） Select Relativistic Quantum Mechanics and Dark Matter,Negative Matter ZHANG Yi-Fang journal6    2014, 35 (2): 41-47.   DOI: 10.3969/j.issn.1007-2985.2014.02.010 Abstract （3550）      PDF（pc） （445KB）（2939）       Knowledge map    Save First,dark matter and dark energy are introduced.Next,it is pointed out that both positive and negative energy must exist in the relativistic quantum mechanics,and accordingly  the negative matter is proposed.The negative matter may be the simplest dark matter.Furthermore,a possible representation of dark matter in quantum field theory is proposed.Then the universe and the negative matter are discussed.Finally,some problems are summarized. Reference | Related Articles | Metrics | Comments（0） Select Comparison Aamong the Negative Refraction Imaging Effects and Imaging Resolution Based on the Two-Dimensional Sonic Crystals GUAN Jun-Jun, LI Bo, DENG Ke, ZHAO He-Ping journal6    2014, 35 (2): 48-51.   DOI: 10.3969/j.issn.1007-2985.2014.02.011 Abstract （2366）            Knowledge map    Save FEM(Finite Elemeat Method) is used to study the relationship between the negative refraction of sonic crystal plate and the plate thickness.It is thus concluded that imaging quality can be improved by cascaded stack of SC sheets. Reference | Related Articles | Metrics | Comments（0） Select Defogging Algorithm Based on the Prior Dark-Channel and Theory of Retinex SHU Ting, DENG Bo, CHEN Bing-Quan, LIU Yao-Feng journal6    2014, 35 (2): 52-56.   DOI: 10.3969/j.issn.1007-2985.2014.02.012 Abstract （3524）      PDF（pc） （926KB）（4003）       Knowledge map    Save To improve the sharpness of the hazy image，utilizing the prior dark-channel method and the multiscale Retinex (MSR) algorithm，a defogging algorithm based on the prior dark-channel and the theory of Retinex is proposed in this paper.First of all，the prior dark-channel method is applied to dehaze the original image in physically，and the detail of image is thus enhanced.Then，the image obtained is treated as the originated input of the MSR algorithm.After that the contrast and average brightness of the final image are improved.Simulation shows that the contrast of hazy image is increased，the average brightness of image is moderate，and the overall effect is good.Furthermore，the clarity of hazy image can be improved in some extent. 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