Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2012, 33(3):197-201,206. DOI: 10.7535/hbkd.2012yx03001
Abstract:By using Krasnoselskii fixed point theorem in a cone, the existence of positive solutions for nonlocal forth order boundary value problem systems with integral boundary conditions is studied. By defining a completely continuous operator in a Banach space, the sufficient condition under which the above problem has at least one positive solution is derived.
2012, 33(3):202-206. DOI: 10.7535/hbkd.2012yx03002
Abstract:A mathematical method is provided to get the combination solution of variables in the encircling of Karnaugh map. Based on the basic theory of K-map, two key points of the method are:Ascertaining the complementary variables by the differences of the corresponding decimal indexes of the two miniterms; Eliminating the complementary variables from the corresponding miniterm in the encircling and qetting get the combination results. The method provides more efficient and accurate way to simplify logic functions based on K-map.It can also be applied to Karnaugh map of any number of variables and to simplification by K-map with computer assistance.
2012, 33(3):207-209,227. DOI: 10.7535/hbkd.2012yx03003
Abstract:The pricing of European bi-direction option when the underlying assets follows fractional jump diffusion is mainly studied. By using the risk neutral valuation principle, the pricing formula of standard European call option, put option and European bi-direction option are obtained when the underlying stock price is depicted by fractional jump diffusion process.
2012, 33(3):210-214,273. DOI: 10.7535/hbkd.2012yx03004
Abstract:Ag/Polypyrrole/titanium dioxide (Ag/PPy/TiO2) nanocomposite particles were prepared by sol-gel method with tetrabutyl titanate, silver nitrate and pyrrole as materials. The effects of PPy monomer dosage, the ratio of raw materials and sintering temperature on the preparation of the nanocomposite particles were investigated. The nanocomposite particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Results show that Ag/PPy/TiO2nanocomposite particles have rod-shaped core-shell structure. Ag and TiO2nanopartticles are coated by PPy.
2012, 33(3):215-219. DOI: 10.7535/hbkd.2012yx03005
Abstract:Synergistic inhibition effect of sodium nitrate and dodecylbenzenesulfonic acid sodium(DBSAS) on aluminum alloy in 100mg/L chlorine dioxide solution was studied by method of weight loss,polarization curves and SEM. The results show that NaNO3has little inhibition effect on aluminum alloy corrosion, and the corrosion inhibition efficiency is only 55.58%. DBSAS has better inhibition effect on aluminum alloy corrosion, and the corrosion inhibition efficiency is up to 89.33%. The complex of NaNO3and DBSAS has good synergistic inhibition effects. When the mass ratio of NaNO3to DBSAS is 3∶7, the complex shows best inhibition effect on aluminum alloy corrosion, and the corrosion inhibition efficiency reaches 96.28%.
2012, 33(3):220-223,230. DOI: 10.7535/hbkd.2012yx03006
Abstract:This paper studies the microstructure of Zeron100duplex stainless steel by using electronic backscatter diffraction (EBSD) technology. When using EBSD to rapidly identify Zeron100duplex stainless steel and analyze the phase distribution in heat treatment, it is found that as the hot-exposed time goes on (the heating temperature is 850℃), the ferrite materials in content decreases and brittleness intermetallic increases, thus improving the brittleness material and reducing corrosion resistance. Moreover, EBSD is used to analyze the orientation relationship between austenite and ferrite of Zeron100duplex steel. It shows that the two phases accord with Kurdjumov-Sachs (K-S) orientation. Deviation distributes from 0~4degrees, with the most concentrates in 1~2degrees. The analysis result and the theoretical calculation results are in good conformity.
2012, 33(3):224-227. DOI: 10.7535/hbkd.2012yx03007
Abstract:After analysing the actual rolling process and the spline finite strip theory, the paper puts forward the dynamic chain model of the rolling process, researches into the practical rolling process and the corresponding relation of the chain structure, and provides the hole pattern stress and strain mathematics description type of chain structure node. Furthermore it presents the node intelligence structure based on the above. The paper provides the general format for the knowledge process and the reasoning method in each Agent, and presents the basic intelligence modification method for node parameter.
2012, 33(3):228-230. DOI: 10.7535/hbkd.2012yx03008
Abstract:Special revolving milling cutters are important and necessary tools in producing special moulds and in the use of digital control system. Aiming at several problems in researching into special revolving milling cutters, this paper shows the corresponding mathematical model and then obtains the solution. It offers some reference for the design of cutter''s curve and machine process schemes.
2012, 33(3):231-236,282. DOI: 10.7535/hbkd.2012yx03009
Abstract:The gas rotary wire-feeding lance is developed for the present steel-making equipment. The lance can be used directly with the guide pipe. Water simulation and pressure water simulation are carried out. In water simulation, the vortex on the surface, the cavity and the recirculatory and rotary are observed. The characteristic curves of the lance coupled with different wires are disclosed in pressure water simulation. According to the test data from Pfizer,the recovery of calcium will be over 30% when using the gas rotary lance under ideal processing parameters.
2012, 33(3):237-243. DOI: 10.7535/hbkd.2012yx03010
Abstract:Aiming at cascading overload phenomenon in power network, a method for portioning correlate areas based on clustering algorithm is proposed. By using DC flow algorithm,the correlate factors between the initial failed branch and the other branches in the power network is analyzed, and a factor that represents the correlation between the initial failed branch and the other branches is picked up. Then, based on that factor, a correlate matrix representing the correlation between any initial failed branch and the other branches is proposed. In order to evaluate the severity of a cascading overload event, an evaluation index is proposed, and based on the evaluation index, a matrix that represents the severity raised by any initial failed branch to other branches is proposed, and a matrix that marks the results of cascading overload is proposed. Then by using the correlate matrix, the severity matrix and the marking matrix, and from the view of subjecting cascading overload and actuating cascading overload,the algorithm for portioning correlate areas in power network under the condition of cascading overload is proposed. The algorithm can take the correlation between the initial failed branch and the other branches into account and can take the operation state of the power system into account. Because the cascading overload phenomenon is related to the correlation between the initial failed branch and the other branches, and related to the operation state of the power system, so the algorithm is a comprehensive one. Some examples show the rationality of the algorithm.
2012, 33(3):244-247. DOI: 10.7535/hbkd.2012yx03011
Abstract:Rockbolt non-destructive detecting system is designed based on ARM, Windows CE operating system and FFT. In hardware design, the signal acquisition module, A/D conversion module, LCD module and the power module are introduced respectively. In software design, the Windows CE operating system is customized and the program is designed. FFT and the design method are introduced.
2012, 33(3):248-252,269. DOI: 10.7535/hbkd.2012yx03012
Abstract:An adaptive chaos control method is proposed, using compressed sensing to identify equations and parameters of chaotic systems based only on the output time series, and using negative feedback control of chaotic system to set goals. Lorenz and the Rssler system is used to illustrate the identfication and control of equations and parameters of the time-varying structure system. First the Lorenz system is controlled to a fixed point or periodic oscillations. When the structure changes to Rssler, the new structure and its parameters is recognized, and the system retruns to the control objectives again. The results show that, compared to least-squares method, the method can be realized with less data, while the model structure and parameters are estimated with high accuracy. Then negative feedback can be used to control rapidly the system to the set goals.
2012, 33(3):253-257. DOI: 10.7535/hbkd.2012yx03013
Abstract:A new method of adaptive backstepping sliding mode controller for robotic manipulator position tracking is introduced. The sliding surface is gained by using the position errors and velocity errors of robotic manipulator joints, and then the backstepping sliding mode controller is designed based on backstepping theory. Furthermore, an adaptive law is proposed to compensate automatically the external disturbance, so as to reduce the control system''s sensitivity to disturbance and control the chattering effectively. At last, the system stability is proved by Lyapunov principle. The simulation result shows better performance.
2012, 33(3):258-262. DOI: 10.7535/hbkd.2012yx03014
Abstract:With TMS320LF2407DSP as control core of a digital space voltage vector control system, this paper expounds the basic principle of SVPWM and control method, and then according to the load characteristics of induction motor and the analysis of switch loss and harmonic characteristic, an optimization strategy suitable for load of induction motor is proposed. Finally, simulations are made for asynchronous motor SVPWM control system by using the Simulink in the MATLAB. The simulation results show that this system has a lot of advantages which can improve energy utilization and reduce harmonic. The structure is simple and easy to control, and has the characteristics of small torque ripple, low noise, and high utilization rate of voltage.
2012, 33(3):263-265. DOI: 10.7535/hbkd.2012yx03015
Abstract:Subjective item marking system has been a study focus.The common method is to contrast the answers with the reference answers to form a score.This paper uses the technology of natural language processing participle to divide a sentence into the assemble of phrases, and then get the score by computing a sentence similarity degree with improved semantic similarity algorithm.
2012, 33(3):266-269. DOI: 10.7535/hbkd.2012yx03016
Abstract:In this paper, the MapReduce programming ideas are applied to Chinese word segmentation processing in Hadoop platform to apply Chinese word segmentation in the cloud computing environment. The research could effectively improve Chinese word segmentation processing speed on the basis of ensuring the accuracy of word segmentation.
2012, 33(3):270-273. DOI: 10.7535/hbkd.2012yx03017
Abstract:Image binarizing process is the prerequisite of error measurement in automatic testing system for steel tape. Because standard steel tape image is greatly influenced by material and environmental factor, images in different quality can not be binarized automaticaly by common method. An improved image binarization method based on Bernsen algorithm is presented. It is proved that the result is satisfactory, and has good adaptability to steel tape picture with nonuniform illumination.
2012, 33(3):274-278. DOI: 10.7535/hbkd.2012yx03018
Abstract:This paper describes a multipurpose method of utilizing peroxid micro-etching waste liquid, and prepars basic copper carbonate by using micro-etching waste, crude copper oxide and sodium carbonate under the process of neutralization, iron removing and reaction. The experiment shows that iron impurities can be absorbed by metatitanic acid. When absorption time is 1hour and the metatitanic acid is 250g per liter micro-etching waste, the appropriate reaction condition of preparing basic copper carbonate is 70℃ and pH 8.5. Under that condition, the quality of the product can meet the chemical purity standards of HG 3-1075—77.
2012, 33(3):279-282. DOI: 10.7535/hbkd.2012yx03019
Abstract:According to the feature of bus line network optimization and adjustment, the cluster evaluation indexes for public traffic network in traffic regions and each bus line are established respectively. Then the features of the public traffic network and each bus line are analyzed by using cluster method. The features of various kinds of lines are summarized, and the unreasonable lines and their causes are determined. Based on this, the measures to improve the existing public traffic network are suggested.