• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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2004 Vol. 17, No. 6

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Research on Transport Operation Mode of Wuhan-Guangzhou Passenger Special Line
PENG Qi-yuan, YANHai-feng, WEI De-yong
2004, 17(6): 703-708.
[Abstract](1426)
Abstract:
By combining quantitative calculation and qualitative analysis, the transport operation mode and its feasibility, and the off-line train running scheme of Wuhan-Guangzhou passenger special line were investigated. The research shows that a multi-speed transport mode should be adopted in the passenger...
Influence of Vertical Skylight on Carrying Capacity of Railway Lines
YIN Yong, YANHai-feng, ZHOU Yong
2004, 17(6): 708-711.
[Abstract](1635)
Abstract:
Based on the analysis of the structure of train diagrams, freight train painting schemes in influencing timeslice before and after a vertical skylight were discussed, a mathematics model was proposed for the deduction of carrying capacity of railway lines resulted from vertical skylights. The analys...
Generation of Turbulent Kinetic Energy and Severe Clear Air Turbulence in Flight
WANG Yong-zhong
2004, 17(6): 712-715.
[Abstract](1446)
Abstract:
Based on the tendency equation of turbulent kinetic energy, its simplified equation including only wind shear and air stability was derived. In addition, this simplified equation was tested using the environmental technical application (ETA) mode and the data of 100 cases of clear air turbulence (CA...
Optimal Model of Daily Freight Plan of Railway Sub-administration Dispatch Based on Benefit Mechanism
ZHOU Yong, PENG Qi-yuan, LI Shi
2004, 17(6): 716-720.
[Abstract](1542)
Abstract:
In order to get the maximum transportation benefit under the limited traffic resources, an optimal model of daily freight plans of railway sub-administration dispatch was established based on the benefit mechanism and the exact mathematics descriptions of traffic restrictions such as capability of s...
Research of Value Evaluation Method for Growth Enterprises
TU Qiao-ping, HUPei, WEI Ya-qing
2004, 17(6): 720-724.
[Abstract](1317)
Abstract:
The evaluation methods for growth enterprises were investigated respectively from the angles of certain investment and uncertain investment. An evaluation model characterizing the growth features of different stages was put forward through analyzing the shortcomings of one-step growth evaluation mod...
Prediction and Analysis of Environmental Kuznets Curve Based on Fuzzy Neural Network
CHUHai-lin, LIJun
2004, 17(6): 725-729.
[Abstract](1421)
Abstract:
To provide a basis for regional economics decision-making, based on the theory of fuzzy neural networks (FNN) an environmental Kuznets curve (EKC) was investigated quantitatively by predicting the coordination degree of environment and economic development. As an example, the coordination degree of ...
Computation of Flexural Rigidity of Steel Reinforced Concrete Beam
ZHAO Shi-chun, SHIJian-ping
2004, 17(6): 730-733.
[Abstract](1420)
Abstract:
Based on the assumptions that a plane section before bending remains a plane after bending and no relative movement takes place between steel and concrete, an expression for the flexural rigidity of steel reinforced concrete (SRC) beams as a function of the rigidities of steel and concrete was deriv...
Research on Free Vibration Properties of Membrane Structure
YUZhi-xiang, ZHAO Lei
2004, 17(6): 734-739.
[Abstract](1243)
Abstract:
By taking two typical tensile membrane structures as examples, the free vibration properties of membrane structures were investigated using the Block Lanczos method, and the effects of stiffness of strengthened cables, prestress on membrane, ratio of rise to span and mass of membrane were discussed....
Identification of Static Coefficients of Bridge Section with Artificial Neural Network
LI Lin, LI Qiao, LIAO Hai-li
2004, 17(6): 740-744.
[Abstract](2013)
Abstract:
Based on enough samples obtained by model experiments in wind tunnel, two BP artificial neural networks (ANNs) were constructed with the MATLAB toolbox of ANN. Then the two ANNs were used to train static coefficients in two different coordinate systems.i.e.body and wind coordinate systems, and train...
Numerical Simulation of Segment Joint Bending Stiffness of Metro Shield Tunnel
ZENG Dong-yang, HE Chuan
2004, 17(6): 744-748.
[Abstract](1651)
Abstract:
The numerical simulation of segment joints of Nanjing metro shield tunnel was carried out with 3D FEM (finite element method). The deformation, rotational angle and bending stiffness of a segment joint under different working conditions were investigated, and the varying law of rotational angle and ...
Compressional Creep Test of High Embankment Settlement
LIUHong, LI Pan-feng, ZHANG Zhuo-yuan
2004, 17(6): 749-753.
[Abstract](1253)
Abstract:
By taking the embankment, with a height of 104 m, of Jiuzhai-Huanglong airport as an example, similar conditions of compressional creep tests simulating the high embankment using filling material of sandy gravel were investigated. The research results show that the compressional creep tests with rig...
Rough Set Algebra and Lattice Implication Algebra
QIN Ke-yun, TU Wen-biao
2004, 17(6): 754-757.
[Abstract](1297)
Abstract:
The relation between rough set algebra and lattice implication algebra was studied, and the method of constructing lattice implication algebra from rough set algebra was presented. Based on the atoms and congruence relations of approximation algebra, it is proved that rough set algebra becomes latti...
Smoothness of the Global Weak Solutions for a Kind of Nonlinear Fourth Order Wave Equations
CHEN Yong-ming, XIEHai-ying, YANG Han
2004, 17(6): 758-760.
[Abstract](1017)
Abstract:
The initial boundary value problem of a kind of nonlinear fourth-order wave equations describing beam vibrations was studied. With Galerkin method, it is proved that the smoothness of the global weak solution can be improved if the smoothness of the initial value is improved. By virtue of Sobolev s ...
Homoclinic Orbits for a Singular Second Order Planar Hamiltonian System
YANG Shou-jian
2004, 17(6): 761-763.
[Abstract](1301)
Abstract:
The existence of a homoclinic orbit for a singular second order planarHamiltonian system is proved by using variational methods. The main assumptions are the strong force condition and the uniqueness of a global maximum of a singular potential. The functional corresponding to the approximate problem...
Distributed Security Auditing System Based on BAS
GOUXian-tai, JIN Wei-dong
2004, 17(6): 764-767.
[Abstract](1446)
Abstract:
A broadband access server (BAS) was used as auditing agent to implement a distributed security auditing system on metropolitan area network (DSASMAN). A new packet filter mechanism based on hardware packet filter (HPF) was proposed. The mechanism of routing and forwarding in BAS was modified from“ro...
Performance Analysis of Multi-code CDMA ALOHA System
PAN Su, LIU Shu-guang, QIU Bo
2004, 17(6): 768-771.
[Abstract](1279)
Abstract:
Based on the multi-code CDMA (code division multiple access) and ALOHA techniques, a multi-code CDMA ALOHA system to support multi-rate data services was proposed. The throughput performance of the proposed system under an additive white Gaussian noise (AWGN) channel was analyzed and simulated. The ...
Adaptive Error Concealment Algorithm Based on H.26L
LIUHai-bo, PENG Qiang
2004, 17(6): 772-775.
[Abstract](1145)
Abstract:
An adaptive error concealment algorithm based on H.26L was proposed by making use of the feature and parameters of decoded frames. The algorithm uses three concealment algorithms, namely, boundary matching algorithm (BMA), spatial interpolation ( SI) and frequency interpolation (FI), adaptively acco...
Quasi-synchronous Scheme for Frequency Hopping System Based on No-Hit-Zone Hopping Code
FENG Li-fang, WANG Xiao-ning, YE Wen-xia, PENG Dai-yuan
2004, 17(6): 776-779.
[Abstract](1292)
Abstract:
According to the characteristics of No-Hit-Zone (NHZ) hopping code, a multi-access quasi-synchronous scheme based on NHZ hopping code for frequency hopping communication system was proposed. Simulation results prove that the scheme assured the frequency hopping system to work within NHZ hopping code...
Construction of Complete Combinatorial Keyboard Circuit
JIN Wei, XIAO Bo, WUZhi-quan
2004, 17(6): 780-783.
[Abstract](1421)
Abstract:
A new method for constructing keyboard circuit, namely, completely combinatorial keyboard circuit, was proposed. The new key board is composed ofnbidirectional interfaces based on the principle of permutation and combination. It allows the maximum number of 2n-1+n (2n-1- 1) keys to be implemented on...
Demodulation of Frequency-Shifting Signals of Automatic Block System with PLL
XIANG Jun
2004, 17(6): 784-787.
[Abstract](1224)
Abstract:
Signal demodulation of automatic block with audio frequency shift modulated track circuits was implemented with phase-locked loop (PLL) technique and a singe chip microcomputer. Experiment showed that the demodulation system can not only reduce the low-frequency pulses from the received signals, but...
Analysis and Application of Dynamic Spectrum of Friction-Induced Noise
GAO Pin-xian, WU Chuan-hui, GAO Xiang-ling
2004, 17(6): 788-791.
[Abstract](1217)
Abstract:
Dynamic spectrum was applied to analysis of friction-induced noises. The result indicates that a dynamic spectrum contains rich information about time-variation, frequency spectrum structure and dynamic range of friction-induced noises. Experiments prove that dynamic spectrum is very sensitive to th...
Response Localization of Asymmetrical Plate-type Structure in Still Water
FAN Chen-guang, LU Li, YANG Yi-ren
2004, 17(6): 792-796.
[Abstract](1463)
Abstract:
To study the forced response localization phenomenon of asymmetric plate-type structures in still water, the assumption mode method was used to derive the vibration model. The analysis was focused on the asymmetric length of the structure and low order natural frequencies. The results show that the ...
Modeling Uniaxial Saturated Ratcheting Strain for 1Cr18Ni9Ti Stainless Steel
YE Yu-ming, CAI Li-xun
2004, 17(6): 797-801.
[Abstract](1260)
Abstract:
A set of uniaxial ratcheting tests for 1Cr18Ni9Ti stainless steel were carried out at room and elevated temperatures. The effects of peak stress, mean stress, low cyclic stressing histories and temperature on saturated ratcheting (SR) strain were investigated. Based on the parabolic relation between...
New Method for Prediction of High Cycle Fatigue Life
HAO Yu-long, DAI Zhen-yu, HUANG Yu-zhong
2004, 17(6): 801-804.
[Abstract](1465)
Abstract:
Randomly distributed models of micro-plastic strains were used to calculate the micro- plastic deformation produced at each cycle of the steel under high cycle fatigue test. The micro- plastic strains are determined by combining the true fracture ductility of the steel under test. For 40Cr steel, th...
Preparation of Nano-scale PEG/Fe3O4Ferrofluids
HU Shu-chun, ZHOUZuo-wan, CHU Long-sheng
2004, 17(6): 805-808.
[Abstract](1353)
Abstract:
Nano-scale ferrofluids of PEG (polyethylene glycol)/Fe3O4were preparedviathe technology for synchronously preparing magnetic particles and covering surfactant and using water as the working fluid and PEG as the surfactant, and the effect of PEG content on the micromorphology and size of PEG/Fe3O4col...
Aluminum Species and Flocculating Mechanism of Polymeric Aluminum Silicate Sulfate
LIU Ying, ZHANG Dai-jun
2004, 17(6): 809-814.
[Abstract](999)
Abstract:
A series of polyaluminum silicate sulfate (PASiS) with different basicities, Al/Si molar ratios and silicic acid polymerization degrees was prepared by the copolymerization (COPOLY) and composite polymerization (COMPOLY) techniques. The distribution of aluminum species in PASiS, the charged characte...
Measure Regulation of the Sakyamuni Pagoda in Yingxian County, Shanxi Province
XIAO Min
2004, 17(6): 815-818.
[Abstract](1141)
Abstract:
By analyzing the measure data of the Sakyamuni pagoda in Yingxian County, Shanxi Province, a new measure regulation was put forward based on the former viewpoints. According to the new measure regulation, the change in the side length of each span of each story can be further explained. The research...

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