Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2010, 31(5):385-389,395. DOI: 10.7535/hbkd.2010yx05001
Abstract:This paper is concerned with the multi-point boundary value problems of delay differential equations with one-dimensional p-Laplacian. By using a generalization of Leggett-Williams fixed-point theorem due to Avery and Peterson, we provide sufficient conditions for the existence of at least three positive solutions to the boundary value problems.
2010, 31(5):390-395. DOI: 10.7535/hbkd.2010yx05002
Abstract:Differential equations, for its profound and vivid actual background, play an important role in many fields, so the research in the existence of positive solutions of boundary value problems for differential equations has become a focus. In this paper, by using a new fixed point theorem, we obtain pseudo-symmetric solutions for three-point p-Laplacian boundary value problems with dependence on the first order derivative.
2010, 31(5):396-398,426. DOI: 10.7535/hbkd.2010yx05003
Abstract:The dynamic evolvement of the magnetic field in the solar photosphere plays key role in the eruptions which occurred in solar corona. Current helicity, induction electric field and Poynting flux of the solar magnetic field have been considered as appropriate representations of the magnetic non-potenciality. The contribution of them to the transverse and relax of the non-potential energies have been analyzed. As an example, the magnetic field of active region NOAA10488has been studied here. The distributions of current helicity, induction electric field and Poynting flux have been calculated, then their relationship with the flare have been discussed. It is found that the distribution of both the current helicity and the Poynting flux correlate closely to the flare, while the correlation of the induction electric field needs further investigation.
2010, 31(5):399-402,432. DOI: 10.7535/hbkd.2010yx05004
Abstract:According to molecular dynamics, the process of tension and compression of Si13 cluster is calculated by using Stillinger-Weber (SW) potential at the temperatures of 300K,50K and 5K. The force-strain relation curve of tension and compression of Si cluster is obtained. The mechanical properties of Si13 at different temperatures and the differences between tension and compression are analyzed. The result shows that the relation between force and strain is linear at the initial phase of tension and compression. The force is increased when temperature is higher in the tension. It is on the contrary in the compression. The tensile force is greater than the compressive force in the same strain. When the tensile strain reaches the limit load, if the cluster is still drawn, the force will suddenly become very small. Then the force and strain show the same linear relationship with the initial phase, which is a phenomenon unique to nano-rods and blocks.
2010, 31(5):403-405. DOI: 10.7535/hbkd.2010yx05005
Abstract:The method for simultaneously determining icariin and stilbene glycoside in anshenbunaoye was established. The method is based on the HPLC separation with DAD detection. The chromatography analysis was performed on DIKMA DiamonsilTM C18 column(4.5mm×250mm, 5μm) by gradient elution with acetonitrile and water at a flow-rate of 1.0mL·min-1. Detection was done by spectrophotometry at 350nm and the column temperature was 30℃. The linear range of icariin was 1.07~9.63 μg·mL-1 (r=0.9995), and the mean recovery was 102.2% with RSD of 2.7%. The linear range of stilbene glycoside was 10~90μg·mL-1 (r=0.9998), and the mean recovery was 99.72% with RSD of 2.3%. The method was accurate,reliable with good repeatability and can be used for the quality control of anshenbunaoye.
2010, 31(5):406-408. DOI: 10.7535/hbkd.2010yx05006
Abstract:To the marked value in the sample,the method has been developed for the determination of KCl in compound bendazol and hydrochlorothiazide capsules by flame atomic absorption spectrometry. The sample was treated in electrothermal stove to incinerate, and dissolved in HCl solution. The sample solution was prepared with water, and sodium chloride was added to eliminate interference.The linear range and formula were 0.5~4.0mg/L and y=0.1262x+0.0013respectively. The precision and recovery rate were 0.39% and 99.98%. The method is simple, rapid, accurate and practical.
2010, 31(5):409-412. DOI: 10.7535/hbkd.2010yx05007
Abstract:Ag/Polypyrrole (Ag/PPy) nanocomposites were prepared with silver nitrate and pyrrole as materials by one-step method and the effects of the monomer dosage and the ratio of raw materials on nanocomposite microspheres were surveyed. The nanoparticles were characterized by UV-visible spectra, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Results show that Ag/PPy nanocomposite microspheres are all of core-shell structure, and the average size is 300~500nm; silver nanoparticles are in the face-centered cubic crystal structure. In the synthesis system the more appropriate molar ratio of PPy and AgNO3is 0.9︰1.
2010, 31(5):413-418,432. DOI: 10.7535/hbkd.2010yx05008
Abstract:The research develops the gastric floating sustained release tablet of vitamin C, studies its behavior of floating and release characteristics and determines the optimal prescription. According to the nature of adjuvant and quality of preparation and through the single factor experiments the main parameters which impact the properties of the vitamin C gastric floating tablet were determined, and then through the orthogonal experiment the optimum prescription and experimental conditions were determined. Tablets were prepared by direct compression with dry powder. Study of its floating properties in the artificial gastric juice was conducted and the dissolution of the gastric floating tablet of vitamin C was detected by titration method. The beginning floating time of vitamin C intra-gastric floating sustained release tablets is less than 5min,duration of floating is more than 12h, and the total drug release in 8h is more than 80percent. Tablets prepared have good behavior of floating and release characteristics.
2010, 31(5):419-422,446. DOI: 10.7535/hbkd.2010yx05009
Abstract:Three pesticide microcapsule formulations of 20% chlorpyrifos microcapsule, 2.5% micro-cyhalothrin and 1.8% abamectin microcapsule were prepared by method of preemulsification-emulsion polymerization in this paper. Particle sizing analysis denoted that they were uniformly dispersed and the droplet size of each kind of microcapsule was less than 1.2μm. The stability of three microcapsules accorded with requirements of pesticide industry whatever storing conditions. The formulations were free of benzene and aromatic derivative additives, free of irritating odor and low intoxicity to human and animal. The microcapsule suspentions are novel environmentally friendly pesticide formulations.
2010, 31(5):423-426. DOI: 10.7535/hbkd.2010yx05010
Abstract:It executes error assessment for developed elevator rail straightness measurement system. The assessment effect explains how it is applied in measuring the top straightness of elevator rail, and provides the more accurate data for the elevator rail factory. This paper introduces system composition and the measurement principle, analyses the reasons of measurement error and elimination methods, and introduces in detail the process of error assessment by accumulation method.
2010, 31(5):427-432. DOI: 10.7535/hbkd.2010yx05011
Abstract:In order to study the correlation of the electromagnetic radiation susceptibility test in a reverberation chamber and a GTEM cell. The physical model of a reverberation chamber and a GTEM cell is established separately by using the electromagnetic simulation software FEKO. Eight frequencies (80,0, 200,0, 400,0, 600,0MHz) are chosen in the common work frequency band (range of 80MHz to 1GHz) of the reverberation chamber and the GTEM cell. At each frequency the induced current on the electrically small monopole antenna which is put in the reverberation chamber and the GTEM cell is calculated. The electric field strength in the relevant position is also calculated at the same time. The data are statistically analyzed. It is concluded that the correlation of the maximum of the normalized induced current on the monopole in the reverberation chamber and the GTEM cell is the best, the correlation of the average value is better, and the correlation of the minimum is the worst.
2010, 31(5):433-436. DOI: 10.7535/hbkd.2010yx05012
Abstract:Traditional edge detection methods are very sensitive due to much noise of the aerial image, therefore an improved edge detector based on mathematical morphology is proposed. First, a compound mathematical morphology filter is applied by weighting. Then through considering structure element sets and determining the weight by self-adaptive method, a new methematical morphology gradient edge detection algorithm with noise suppressed is presented. The experiment results show the method is superior to some old methods, and effectively inhibit the noise.
2010, 31(5):437-441,478. DOI: 10.7535/hbkd.2010yx05013
Abstract:This paper presents an off-line reconfigurable method for FPGA based on micro control unit (MCU) and U disk. By using this method, a new hardware modulation platform in SDR is designed. With the help of modulation IP core, the method can achieve multiple modulations for different kinds of baseband signal and off-line reconfiguration for a large number of configuration data. By scanning the keys, the MCU calls the corresponding configuration data in the U disk to achieve on-line reconfiguration of the FPGA. Based on the refactoring data, FPGA deal and send the baseband signal to the DUC to achieve the output of the modulation signal. Modulation result was sent to MCU and displayed on the LCD. Compared with the traditional methods, this method has the advantages of flexible operation, easy upgrade, multiply modulation, and supporting off-line dynamic reconfiguration, thus having a higher value in engineering.
2010, 31(5):442-446. DOI: 10.7535/hbkd.2010yx05014
Abstract:The control of the time-delay chaotic system is studied when the system model, the location of the unstable fixed point and the local dynamics at the point are unknown. A neural predictive control method is proposed to control the chaotic motion in an unknown time-delay chaotic system onto the unstable fixed point. The proposed control system includes a watcher, a regularized neural predictor and an on-line trained linear neural predictive controller. We analyze the stability of the control system. The proposed algorithm is simple and its convergence speed is higher than that of existing similar algorithm. The simulations demonstrate the effectiveness of the control method.
2010, 31(5):447-450. DOI: 10.7535/hbkd.2010yx05015
Abstract:BP (back propagation) neural network is a supervised neural network learning algorithm, but the original algorithm has a slow convergence rate and low accuracy, and the training process of which is easier to fall into local minimum value. In this paper, we impoved the BP neural network algorithm, which partially overcomes the above drawbacks. An improved BP algorithm is completed with the C programming language. We examined the improved BP algorithm with real data about the employment of students. As is shown, the modified algorithm is effective. And it is also a decision support algorithm for the employment ability of college students.
2010, 31(5):451-454. DOI: 10.7535/hbkd.2010yx05016
Abstract:Based on the study of Matlab/RTW function, a real-time experiment simulation system is designed. On this platform, data transmission between practical process and Matlab workshop is carried out by an I/O card supported by Matlab, so that the practical system is imported to the simulation loop to realize the integration of system modeling, analysis, digital simulation and goal implementation. The simulation result shows that the system has good real-time performance, and parameters can be modified online.
2010, 31(5):455-457. DOI: 10.7535/hbkd.2010yx05017
Abstract:Task assignment of extended enterprise in networked manufacturing is influenced by many factors. Considering delivery date, cost and number of member enterprise, a mathematical model of task assignment with multi-objective was presented.
2010, 31(5):458-462. DOI: 10.7535/hbkd.2010yx05018
Abstract:The elementary binary searching algorithm and some improved algorithms are compared and analyzed, and an anti-collision searching algorithm based on bit-shield is proposed for the first time. The algorithm adopts the method of "back mechanism" to decrease the total times of search, and by using known information and not sending and responding reduplicated information decreases the bits between the reader and the tags. The total times of command and the length of parameter of every command are decreased effectively, and the efficiency and speed of tags identification is improved.
2010, 31(5):463-467. DOI: 10.7535/hbkd.2010yx05019
Abstract:The temporal information that includes natural language expressions is the key to the medical information system. However, how to process the indeterminate temporal information in the natural languages remains unsolved. According to the need of the medical information system, the current research technologies of the temporal data model and some classical indeterminate temporal medical information data model are studied in this paper. This paper proposes an indeterminate temporal data model, named NLTM, based on natural language expressions, to deal with the above problems in the medical information system and extends all sorts of temporal primitive types to support time indeterminacy according to the attributes definition of NLTM.
2010, 31(5):468-471. DOI: 10.7535/hbkd.2010yx05020
Abstract:Aiming at the varied spans of 24m, 27m and 30m for the bulk grain storehouse, the mechanical calculations of the bent frame columns with different grain height of 4.5m, 5.0m and 5.5m were respectively performed. The main findings are that the reinforcement of columns rises rapidly with the increasing grain height. However, under the invariable grain height the reinforcement of columns has little variance with increasing span. Those findings are helpful to the construction of provincial grain storehouse.
2010, 31(5):472-478. DOI: 10.7535/hbkd.2010yx05021
Abstract:Because of special section shape, the joints with specially shaped columns under high axial compression ratio will damage more seriously than the joints with ordinary rectangular columns when suffering earthquakes. Through the low frequency cyclic loading experiment of an exterior joint and a middle joint with specially shaped column, the development and destruction of concrete cracks of the joints with specially shaped columns under high axial force were analyzed, the shearing strength of the joints core were calculated by experiment data, and the shear mechanism of the joints with specially shaped column was investigated combined with the stirrup strain distributed in joint core. It is shown that the joint with specially shaped column under high axial force have larger shear, and the concrete in web of joint core will be cracking more seriously, so joints become the weakness site of the structure with specially shaped columns, thus restricting the storey height of structure.
2010, 31(5):479-482. DOI: 10.7535/hbkd.2010yx05022
Abstract:In caprolactam wastewater treatment process, as the wastewater containing acetate enters ENSBR reactor, the operating characteristics of ENSBR reactor change. Through analysis of the changes, we found that in the case of high concentration of organic matter, nitrification can occur quickly and acetate favours nitrification of high nitrogen concentration organic wastewater.
2010, 31(5):483-486. DOI: 10.7535/hbkd.2010yx05023
Abstract:This experiment constructed genetically engineered bacteria with salt tolerance by using technology of molecular biology, studied the effect of salinity and inducer on its growth, and explored the affecting factors for the degradation of acid red B. The results suggested that the salt-tolerant ability of genetically engineered bacteria is better than E. Coli BL21, and the optimal conditions for the degradation of acid red B is pH=6.5,5℃. At 10% salinity conditions, 5kinds of azo dyes were better degraded by genetically engineered bacteria than E. Coli BL21.