Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2011, 32(1):1-7. DOI: 10.7535/hbkd.2011yx01001
Abstract:By using scattering matrix theory, the electron transport in a two-dimensional system containing multi-rectangular scattering impurities is studied. At zero temperature, the conductance shows the quantum phenomena which increases with the increase of electron energy and with the decrease of the width of scattering impurities. The impurity makes the conductance decrease rapidly at its small length, and at large length the conductance shows periodic oscillation. In the multi-scattering system, the conductance no longer decreases rapidly but oscillates with increasing number of scattering impurities. The increase of temperature makes the conductance stages tilt and the quantum phenomena disappear gradually.
2011, 32(1):8-10,102. DOI: 10.7535/hbkd.2011yx01002
Abstract:For the M/M/1queuing model, this paper researches into the uncertainty of its input rate. The gray parameters are introduced into input rate, so the gray input rates are formed, and its basic model is given. Furthermore, the paper studies its gray stationary distribution and gray indicators. Every gray indicator is whitened, and the whitening values are obtained.
2011, 32(1):11-14. DOI: 10.7535/hbkd.2011yx01003
Abstract:In this paper, a new construction of A2-codes based on projective geometry is given, and the parameters are computed. Assuming that the probability distribution of all the rules are uniform, the probabilities of successful attacks are also computed.
2011, 32(1):15-19,42. DOI: 10.7535/hbkd.2011yx01004
Abstract:Using five functions fixed point theorem, we prove the existence of at least three positive solutions to second-order systems with p-Laplacian under three kinds of boundary conditions, respectively. We give an example to illustrate our result.
2011, 32(1):20-25. DOI: 10.7535/hbkd.2011yx01005
Abstract:HS-SPME-GC-FPD method was developed for the determination of tributyltin in sea water. The samples were derivatived by NaBH4, extracted by headspace solid phase micro-extraction and measured by gas chromatograph with flame photometric detector. The calibration curve for tributyltin is linear in the range of 40～200ng/L and the correlation coefficient is 0.9868 for tributyltin. On the three spiked levels of 100ng/L, 140ng/L and 200ng/L, the range of recovery is 81.0%～121.0% and RSD is 16.98%. The detection limit of tributyltin is 15ng/L. The method is simple and feasible for the determination of organic compounds in sea water with satisfactory results.
2011, 32(1):26-29. DOI: 10.7535/hbkd.2011yx01006
Abstract:In view of the disadvantage of the traditional SCR phase-control rectification hydrogen preparation power supply, a new diode rectification with multiplex chopper topology is introduced, which is used in large capacity hydrogen preparation power. DSP+FPGA controller is designed, with a variety of failure protective and display functions. Then a multiplex large capacity hydrogen preparation system is developed. The simulink and the running states are very good.
2011, 32(1):30-33,42. DOI: 10.7535/hbkd.2011yx01007
Abstract:We analyzed the mechanism of detecting the inter-turn short-circuit in rotor winding fault with detecting coil, and extracts the signal feature with wavelet transform algorithm. Hybrid programming of MATLAB and VC++ is used, embedding ding M document of MATLAB into the VC and making them run normally without MATLAB. The signal collecting, system frame constructing and interface drawing can be carried out by adopting VC++ graphical interface as the front-stage, while using COM builder technology to implement communication between MATLAB and VC++. With MATLAB as the back-stage, the inter-turn short-circuit in rotor windings fault can be judged through the data analysis and calculation. The results show that the system has a good effect in practical application.
2011, 32(1):34-38. DOI: 10.7535/hbkd.2011yx01008
Abstract:The modulate factor is an important parameter in analog FM station. The instantaneous frequency of the FM signal is the result of module factor and FM signal working together, and the module factor can be calculated by instantaneous frequency. But the calculation precision of instantaneous frequency is easily affected by the noise of the received signal. When the SNR(Signal Noise Ratio) is higher than 20dB, the relative error between modulate factor and real value will be lower than 1%. The common ways to calculate instantaneous frequency include:time-frequency analysis; short time Fourier transformation and so on. The calculation precision is easily affected by the factors of cross term, window choices and noise. Besides, because of using two-dimension transformation, the calculated amount is larger and the property of real-time is not so good. So a new algorithm of particle filtering is given in this paper, which can reduce the noise and operation amount and improve the precision of estimation. The simulation experiment verifies the efficiency of the algorithm.
2011, 32(1):39-42. DOI: 10.7535/hbkd.2011yx01009
Abstract:The paper introduced the methods of household meter data transmission and control through internet of things. By using M-Bus as field bus network, MSP430embedded MCU as cell site network, GPRS wireless data transmission as means of communication between cell site network and urban household meter management center, an internet of things of household meters with characteristics of data sharing, remote control and fault diagnosis is built.
2011, 32(1):43-46. DOI: 10.7535/hbkd.2011yx01010
Abstract:In order to construct the scientific systematization of knowledge of recursion in data structure, this paper analyzed the recursion essence of common data structure and the components of recursive algorithm, then proposed the general principles of the conversion from recursion to non-recursion. Based on the classifications of the recursion algorithm, it also designed the conversion model whose practical is verified.
2011, 32(1):47-51,56. DOI: 10.7535/hbkd.2011yx01011
Abstract:Complex industrial process has the characteristics of uncertainty, nonlinear, non-Gaussian, large delay and strong coupling, so it is difficult to build linear control model. Particle filter (PF) algorithm can be used in global optimization of nonlinear, non-Gaussian system, making the model reflect the real system state accurately. This paper proposed a partical filter based radial basis function (RBF) neural network method, and applies it to the study of synthetic ammonia decarbornization production process. The synthetic ammonia decarbornization process is a complex industrial production process, whose on-line control model is difficult to establish. Some simulation study with the synthetic ammonia decarbornization has shown that after using PF it has better performance than using only fuzzy neural network. The result also shows that the system is more effectively controlled after using PF algorithm. It provides an efficient way for the complex system modelling and optimization control research.
2011, 32(1):52-56. DOI: 10.7535/hbkd.2011yx01012
Abstract:An exciting type of data-integrated application based on Web is sprouting up all across the Internet, which is called Mashup application. At the same time, some new technologies and social challenges reveal themselves sequentially. This paper researches in Mashup application from a perspective of security, discusses how to assess the risks of Mashup application, and puts forward a risk evaluation model and some possible metrics for the actual assessment.
2011, 32(1):57-59. DOI: 10.7535/hbkd.2011yx01013
Abstract:The gear case is designed based on Pro/E three-dimensional parametric technology based parts library modeling system. The system uses feature modeling and parametric design to create universal models, then by modifying the component parameters, generates the corresponding component model, instead of creating every single model, which greatly improves design efficiency, reduces design effort, and thereby shortens the product development cycle.
2011, 32(1):60-63. DOI: 10.7535/hbkd.2011yx01014
Abstract:In this paper, the hydrogen storage in pretreated carbon nanotubes is studied. The results indicate that there exists an uptake maximum at certain pressure between 0~12MPa, and this maximum is related with the kind and the treatment of the samples. For different quantity and different kinds of alkali-doped samples, the alkalis plays different roles. High-temperature activation is effective for adsorption. At room temperature, under 9MPa, the highest uptake is about 4.48%(mass ratio). Increasing ambient temperature properly benifits adsorption．
2011, 32(1):64-68,97. DOI: 10.7535/hbkd.2011yx01015
Abstract:The second generation of ferrocenyl-terminated polyamidoamine dendrimer (G2-PAMAM-Fc) has been successfully obtained by a reductive ammonification reaction between ferrocene formaldehyde and the third generation of hyperbranched polyamidoamine (G2-PAMAM). The thermal properties and the glass transition temperature have been investigated by thermal gravimetry (TG)-derivative thermal gravimetry (DTG), differential scanning calorimetry (DSC) techniques. The maximum graft degree of ferrocene on PAMAM is 78% according to UV/visible spectra determined spectrophotometrically at 438nm. The glass transition temperature of G2PAMAM-Fc is higher than that of G2PAMAM. PAMAM- Fc is more thermally stable than G2-PAMAM. The incorporation of ferrocene into dendrimer could efficiently improve its thermal stability. The probable mechanism of thermal stability is discussed.
2011, 32(1):69-74,97. DOI: 10.7535/hbkd.2011yx01016
Abstract:Our aim is to optimize the formula of gastroretentive floating tablets of berberine hydrochloride and to evaluate its buoyant and drug release characteristics in vitro. In accordance to the nature of adjuvant and the quality of preparation and by using the single factor experiments to determine the main parameters which impact the properties of the gastroretentive floating tablets of berberine hydrochloride, the optimum prescription and experimental conditions were determined. Tablets were prepared by direct compression with dry powder. The floating properties in the artificial gastric juice was studied and the UV-visible spectrophotometry was used to detect the release volume of the gastroretentive floating tablets of berberine hydrochloride. Results show that the optimum prescription includs HPMC(K15M) 35mg, NaHCO320mg, CMS-Na 47mg and PEG600015mg. The tablet begins to float in 1min, and the floating time is over 12h.The total drug release in vitro in 12h is more than 80percent. The prepared tablets have good behavior of floating and release characteristics, and the preparation is simple.
2011, 32(1):75-77,81. DOI: 10.7535/hbkd.2011yx01017
Abstract:A high performance capillary zone electrophoresis method was established for the determination of marbofloxacin drug substance. An untreated fused-silica capillary was used with 15mmol/L sodium borate buffer (pH 9.2) as running buffer at the detection wavelength of 295nm, separation voltage of 20kV and the injection volume of sample for 10s. The calibration curve for marbofloxacin is linear in the concentration range of 10~100μg/mL. The average recovery is 100.2% with RSD of 0.97%.
2011, 32(1):78-81. DOI: 10.7535/hbkd.2011yx01018
Abstract:To prepare gastric mucoadhesive pellets of domperidone and study the release behaviour and adhesive in vitro, carbopol, hydroxypropyl cellulose(HPC) and PVP are used as the main adhesive materials, 30% NaCl(mass ratio) solution is used to be a wetting agent of soft wood, and extrusion-spheronization method is used to prepare pellets. Taking adhesion in vitro and sustained release behavior of the pellets as indicators, through orthogonal design, we optimized and verified the best prescription.The mass ratio of carbopol, hydroxypropyl cellulose(HPC) and PVP is 80∶80∶15.In vitro test data show that domperidone adhesion sustained-release pellets have good adhesion and release effect.The formulation and process developed in the study is convenient, repeatable and suitable for mass production.
2011, 32(1):82-87. DOI: 10.7535/hbkd.2011yx01019
Abstract:Due to the special section of T and L-shaped columns, the web and the flange will bear pressure or tension under forward and reverse load. The shear capacity and deformation capacity are different under forward and reverse load, and when the shear-span is lower the difference is more obvious. Through low frequency cyclic loading experiment of T and L-shaped columns while the shear-span is 2.5, this paper investigated the failure characteristic, shear capacity, deformation capacity and rigidity degeneracy of the T and L-shaped columns with low shear-span ratio. The results show that the shear capacity and deformation capacity of the T and L-shaped columns are obviously different under forward and reverse load. The web concrete in column foot will be damaged seriously under pressure, which reduces the section stiffness and shear capacity, so the column foot may become the weak position of specially shaped columns.
2011, 32(1):88-91. DOI: 10.7535/hbkd.2011yx01020
Abstract:Expanded poly-styrene(EPS) is a new material to reduce the subsidence of the bridgehead of soft embankment. Traditional design and material selection of EPS embankment does not take into account the basic characteristics of creep. Creep tests of EPS specimens in varied density and pressure are performed. Results are as follows:Uniaxial compressive strength and anti-deformation ability of EPS linearly rise up with increasing density; creep deformation of EPS depends on the stress factor. Creep deformation increases closely linearly with the stress factor and becomes stable fast when the factor is less than 0.6. However the creep deformation increases nonlinearly and rapidly and becomes unstable when the factor is more than 0.6. Conclusion from the creep test can determine the design value of compressive strength of EPS and the corresponding density requirements. The relation between the creep deformation and time follows the hyperbolic curve, and the corresponding constitutive creep relation is presented. The method to obtain the parameters is introduced. Case studies show that the constitutive relation of EPS presented better reflects the creep behaviors of EPS.
2011, 32(1):92-97. DOI: 10.7535/hbkd.2011yx01021
Abstract:This paper presents the theory of measuring attitudes and analyses the lag of acceleration bias measurement when the vehicle rolls and the sensor drifts, using kinematic Kalman filter with one-antenna GPS/INS measurement system, then brings forward the way to measure directly the vehicle sideslip angle and sensor drift with tow-antenna GPS/INS measurement system, which is used to estimate the vehicle sideslip angle, tire slip angle and tire cornering stiffne ss. The result of experiment shows that the estimation of slip angles and tire cornering stiffness with two-antenna GPS/INS measurement well match the theoretical value, which means the two-antenna GPS/INS measurement as a direct measure method has high estimation accuracy. It can be confirmed that the technology shows unique superiority in the application of future vehicle security systems.
2011, 32(1):98-102. DOI: 10.7535/hbkd.2011yx01022
Abstract:One dominant strain of Mucor BFL-5was separated and cultivated, and used as test organism. Alginate embedding method was used to immobilize fungi, which was activated before Terramycin wastewater treatment test. The COD removal rate is more than 80%, and oxytetracycline degradation rate is up to 95%. Microscopic observation results show the fungi embedded in alginate are immobilized living cells. Embedded spores grow into mycelia by activating, thus their oxytetracycline degradation ability is significantly increased.