Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2009, 30(4):285-289. DOI: 10.7535/hbkd.2009yx04001
Abstract:Taking a class of uncertain parameters Rossler system for example, the design method of adaptive chaos controller is investigated. Firstly, based on adaptive backstepping algorithm, single controller is designed. Secondly, due to Lyapunov function, two controllers are designed. Validity of two different methods is verified numerically for controlling uncertain parameters systems.
2009, 30(4):290-293. DOI: 10.7535/hbkd.2009yx04002
Abstract:We researched a modified DY method with nonmonotone line searches. Under proper conditions, we proved the global convergence of modified DY conjugate gradient method with the nonmonotone line searches for nonconvex functions. And according to the numerical results, the algorithm is effective.
2009, 30(4):294-297,378. DOI: 10.7535/hbkd.2009yx04003
Abstract:Support vector regression (SVR) is a new method for data mining. This paper presents one condition for second order sufficient property of support vector classification to hold. The condition is so weak that support vector classification meets it easily. The theory provides an important foundation for sensitivity analysis of SVR.
2009, 30(4):298-301,322. DOI: 10.7535/hbkd.2009yx04004
Abstract:Based on the finit-U Anderson model, we use Keldysh nonequilibrium Green′s function to calculate the DOS (Density of State) in a Kondo resonace quantum dot. Because of interference between the resonant tunneling and the non-resonant tunneling path, the DOS varies with the non-resonant tunneling strength or Coulomb interaction energy prominently, the resonant peaks can be enhanced or reduced, and novel resonant structure may be induced.
2009, 30(4):302-304,313. DOI: 10.7535/hbkd.2009yx04005
Abstract:We describe a class of theories of dielectric polarization and use the theories to describe a species of solitons. The solitons, made entirely out of the polarization field, have quantized values of the electric charge and can be interpreted as electrons and holes. A soliton-antisoliton pair is an exciton. We present numerical evidence that the elementary soliton is stable.
2009, 30(4):305-309. DOI: 10.7535/hbkd.2009yx04006
Abstract:A novel method is proposed to characterize and differentiate tea samples by using three-dimensional fluorescence spectroscopy(TDFS),contour fingerprint plot and principal component analysis(PCA) technique. Compared with conventional fluorescence spectroscopy techniques,TDFS can show more fluorescence characteristics. Multi-peaks of spectrum are regarded as variables, fluorescence intensities corresponding to these peaks are observed. The main factors can be determined by contribution-plot.The method was validated by experiment on 15tea samples and it can be adopted by factories for tea quality monitoring.
2009, 30(4):310-313. DOI: 10.7535/hbkd.2009yx04007
Abstract:The binding of Pb2+ to human serum albumin(HSA) or bovine serum albumin (BSA) has been studied by equilibrium dialysis at pH 6.3. Scatchard analysis indicates that there are 1.6and 1.8strong binding sites for Pb2+ in BSA and HSA, respectively. The successive stability constants for the Pb2+-HSA and Pb2+-BSA systems are determined by non-linear least-square method fitting Bjerrum formula. Of these stability constants, K1and K2are obviously higher than the values of the other stability constants. The analysis of Hill plot indicates that there exists weak negative cooperative effect in both Pb2+-HSA and Pb2+-BSA systems.
2009, 30(4):314-318. DOI: 10.7535/hbkd.2009yx04008
Abstract:The relationship between external testing pressure coefficient and the two factors,the buckling safety factor and the fuzzy reliability range was quantitative analyzed based on the random-fuzzy probability model. The researching results show that:1)For the fuzzy reliability range of critical strength in buckling for steel thinness wall cylinder, the range should be 0.9997091~0.9999992822under external barometrical pressure test, the range should be 0.998411~0.9991836under external hydraulic pressure test,and the range should be 0.9999992822~0.99999999864during normal operation; the normal buckling safety factor should not be less than 2.60; the external testing pressure coefficient of the cylinder should not be less than 1.08 and greater than 1.16for barometrical pressure tests,and not less than 1.08and not greater than 1.61for hydraulic pressure tests;2)Fifty-five group testing data proves the validity of the method.
2009, 30(4):319-322. DOI: 10.7535/hbkd.2009yx04009
Abstract:A program for computation of heat transfer and flow resistance is compiled based on heat transfer model and resistance characteristic of the automobile radiators.Effects of the geometric structure of the radiators are evaluated. The results show that the ribbon space of the radiators has significant influence on heat transfer and flow resistance, namely with the decrease of ribbon space,heat release increases, so bigger fins should be selected to ensure heat transfer condition.
2009, 30(4):323-327. DOI: 10.7535/hbkd.2009yx04010
Abstract:A novel passive resonance soft-switching boost DC-DC circuit topology is given, and its seven working status and waveforms are particularly analyzed. The main power switch and diode are working in soft-switching, by appending some L,C,D parts in basic boost circuit. The developed converter''s efficiency and reliability are improved. The circuit is emulated with Pspice software and switch waveform of 90kW DC-DC converter developed based on the topology is given. The converter is successfully used in the first domestic fuel cell city bus and the technical index is fulfilled.
2009, 30(4):328-329,343. DOI: 10.7535/hbkd.2009yx04011
Abstract:For the relationship of wavelength change of narrow linewidth fiber laser and thermal tuning, experiments present that laser wavelength continuously change when the temperature changes, and the output power is undulating slightly, and mode hopping is not observed on the spectrometer.Self heterodyne of some temperature spots was measured, and the change of 3dB band width is smaller than 1kHz. Excellent spectrum properties and wavelength stability of fiber laser selected by fiber grating etalon are demonstrated.
2009, 30(4):330-332,339. DOI: 10.7535/hbkd.2009yx04012
Abstract:As one of the important content of RRM(Radio Resource Management) in TD-SCDMA system, AC is based on the measure of capacity on a cell, so it has become important to find a method to reckon the capacity on a cell. Starting with concept of AC and capacity on a cell and so on, algorithms for used to recon capacity on Uplink and Downlink are proposed . Algorithm for Uplink is based on the control over noise degradation, for it can be effective to measure interference in system. Algorithm for Downlink comes from the total power of BS, which has an intuitionistic meaning. The relationship between the cell and adjacent cells is analyzed furthermore, providing a theoretic basis for the optimization of network. Several important simulation results over important variables are provided to verify the algorithms proposed in this paper.
2009, 30(4):333-339. DOI: 10.7535/hbkd.2009yx04013
Abstract:Based on the former research on IP flows arrival distribution, this paper analyzed the interarrival time distribution and the autocorrelation of IP flows coming from different large-scale networks. It is found that the IP flows'' interarrival time distribution follows Weibull distribution whose parameter α is close to 1.0as the scale of network becomes larger, so the Weibull distributions degrades to exponential distribution. And the autocorrelation parameter becomes less as the IP flows'' length increases—when the flow length of a IP flow increases to 100,its arrival becomes irrelevant to others.
2009, 30(4):340-343. DOI: 10.7535/hbkd.2009yx04014
Abstract:In order to monitor network transmission effectively and safely and detect suspicious behavior in the network,the intrusion detection software is solidified in embedded hardware development board which is based on SBC84620.The system adopts real-time Linux operating system which is used widely in the field of industries,achieves real-time detection and prevention to hacking attack including port scans,buffer overflow attacks,backdoor attacks, DOS attacks and other information-gathering network,and reduces development costs and increases data processing speed.
2009, 30(4):344-346,357. DOI: 10.7535/hbkd.2009yx04015
Abstract:A carbon steel inhibitor in chlorine dioxide system was developed. The electrochemical properties of A3steel in chlorine dioxide solution (with chlorine dioxide mass fraction of 200×10-6) and the inhibiting ability of inhibitor to the A3steel were investigated by static weight-loss measurement and electrochemical methods. Results show that the combination of 0.20g GL and 0.15mL HEDP can reduce the corrosive rates of A3steel, and corrosion degree is reduced from heavy corrosion to mildly corrosion. The research in inhibitor has actual value for A3steel used in chloride dioxide system.
2009, 30(4):347-349,369. DOI: 10.7535/hbkd.2009yx04016
Abstract:Maleic anhydride grafting polyethylene(PE-g-MAH)was prepared by solution method and aluminum hydroxide(ATH) was modified with the PE-g-MAH in liquid phase .The relationships of graft ratio of maleic anhydride onto PE with initiator content and maleic anhydride content were investigated. The effects of surface modification on property of composite of PE /ATH were discussed as well. The experimental data regarding to the composites indicates that the melt equilibrium torque decreases and the mechanical properties increases when ATH is treated with PE-g-MAH of right dosage (the mass ratio of PE-g-MAH /ATH is about 2% in this paper).
2009, 30(4):350-353. DOI: 10.7535/hbkd.2009yx04017
Abstract:Poly(N-vinylcaprolactam)(PNVCL) was synthesized by radical solution polymerization of N-vinylcaprolactam, with iso-propanol used as solvent and azobisiobutyronitrile (AIBN) as initiator. The effect of reaction conditions on poduct yield was investigated. The structure and thermo-sensitive properties of PNVCL were characterized by Vis, FT-IR and NMR. Results show that the PNVCL yield is up to 91.8% under the conditions of N-vinylcaprolactam 6g, iso-propanol 30mL, AIBN 0.04g, reaction time 14h and temperature 65℃. The effect of PNVCL concentration and addition of mineral salts were studied. The results reveal that the LCST of PNVCL decreases with the increase of PNVCL concentration and the addition of mineral salts.
2009, 30(4):354-357. DOI: 10.7535/hbkd.2009yx04018
Abstract:Thermal balance method was used to analyze the adjustment methods for household heat metering system, and the concept of heating-coefficient and heating-time were put forward, then the formula between them was deduced. By using this formula the data relation table about the different heating-coefficient and heating-time under certain outside and indoors temperature conditions was figured out.
2009, 30(4):358-361. DOI: 10.7535/hbkd.2009yx04019
Abstract:In order to study the feasibility of recycling filter backwash water in Liuwan waterworks,this paper carried out the coagulating sedimentation test by means of motor stirrer with PAM(polyacrylamide) as the coagulant. The test results show that cationic PAM should be used as coagulant with the optimum dosage of 1mg/L,and with 5min sediment the turbidity of supernatant is 1.48,obviously lower than that of raw water. Therefore,the filter backwash water could be directly recycled into raw water.
2009, 30(4):362-364,373. DOI: 10.7535/hbkd.2009yx04020
Abstract:Through comparing barreled drinking water and direct drinking water, we choose direct water supply mode. And through water supply technical and economic evaluation of three methods, including engineering and technical difficulty, total investment of the project, the extent of secondary pollution and the cost of running and management, we select dual water supply method. The technical indicators are discussed.
2009, 30(4):365-369. DOI: 10.7535/hbkd.2009yx04021
Abstract:How to assess the performance of knowledge-based staff reasonably is what many software enterprises concern.Based on the relevant literature review, the index system of performance evaluation has been built with the examples of the staff characteristics and assessments of key indices in Founder; assessments and analyses are made on the indices with analytic hierarchy process; in the end, implementation methods of performance examinations and advices on exertion of results are put forward, which are practical and worth promotion in performance examinations of software enterprises.
2009, 30(4):370-373. DOI: 10.7535/hbkd.2009yx04022
Abstract:Relationship between higher education and regional economy was studied.The contribution model of higher education to regional economy was given, and the positive relativity between them was verified. Then the contribution rate of the higher education to the regional economy of Hebei province was calculated, which shows that the mathematic model is reasonable.
2009, 30(4):374-378. DOI: 10.7535/hbkd.2009yx04023
Abstract:The strengths, weaknesses, opportunities and threats in regard to SMEs technology innovation in Hebei province were analyzed by SWOT method. The SWOT analysis table for technology innovation model selection was drawn and the present model choice was discussed.