西南交通大学学报

Groundwater Age Determined with Environmental Tritium in Qinling Tunnel Area

LIU Dan, LI Qi-bin

2002, 15(6): 601-605.

[Abstract](1318)

Abstract:
Groundwater residence time is quantitatively determined with environmental tritium and an isotopic mathematical model in Qinling extra-long tunnel area. The mean age of all the groundwater is over 43 years, and even up to 70 years in the ridge zone, obviously older than that of shallow groundwater a...

An Analysis on Trend and Technology Demanded of Urban Rubbish in China

YU Su-jun, YANG Li-zhong, LI Xiao

2002, 15(6): 606-609.

[Abstract](1085)

Abstract:
A analysis on the actualities and a certain problems dealing with headstream, sanitary fill, cremating process and composting process in treatment and disposal of urban refuse in China is conducted. And in accordance with such situation some viewpoints are rendered including that headstream should f...

Characteristics of Seepage Water Quality of Baisha Filter Well in Chongqing

LI Xiao, YANG Li-zhong, YU Su-jun

2002, 15(6): 610-614.

[Abstract](1358)

Abstract:
Analyses of the seepage water quality in the filter well constructed by Baisha waterworks in Jiangjin, Chongqing reveal that, through infiltration of sandy gravel in the river bed, the micro- polluted, high turbid river water can be converted into seepage water with suspended substances and bacteria...

Influences of Rail Creep on the Longitudinal Forces and Displacements of Welded Turnout

WANG Ping, GUO Li-kang

2002, 15(6): 615-619.

[Abstract](1469)

Abstract:
Moving wheel loads will cause creep and additional temperature stress in continuously welded rails (CWR). The difference in the structure of frog and frog heel will result in different transmission mechanism of the longitudinal forces in welded turnouts. Therefore, the welded turnouts with different...

Laying 60 kg/m Rails on Sharp Curves along Guiyang-Nanning Line

LI Cheng-hui, GUO Li-kang, GAO Feng

2002, 15(6): 620-622.

[Abstract](1626)

Abstract:
A mechanical analytic model is built to study the lateral force acting on the rail fastenings and the track geometry error in sharp curves during laying 60 kg/m rails in sharp curves. Computation and analysis are made based on a curve with the smallest radius of 177.1 m along Guiyang-Nanning line. T...

Determination of Partial Coefficients of Structural Reliability Design

YAN Song-hong, ZHOUJia-mei, GAO Bo

2002, 15(6): 623-627.

[Abstract](1519)

Abstract:
Based on the geometrical meaning of the reliability index b and the basic concept of partial coefficients, the calculation method for the partial coefficient in the structure limit states design equation is discussed under the objective reliability index bnom by constructing a virtual limit state ca...

Experimental Study on Erosion Stability of Thick Layer Base Material Spraying Bio-Slope-Engineering

ZHANG Jun-yun, ZHOU De-pei

2002, 15(6): 628-631.

[Abstract](1005)

Abstract:
The erosion stability of base material mixture is one of the important indices of evaluating thick layer base material spraying bio-slope-engineering. Based on artificial rainfall experiments, the effect of base material mixtures with different compositions on its erosion modulus is studied. The res...

Real-Time Generation of Dynamic Terrain Based on Adaptive Quadtree

PENG Yi-pu, ZHAN Wen-hua

2002, 15(6): 632-636.

[Abstract](1363)

Abstract:
A multiresolution and real-time terrain generation model based on adaptive quadtree is presented. The algorithm of the model includes the adaptive inputting and static culling of raw data, renewing of error evaluation criterion, and frame-to-frame coherence. Experimental results show that this algor...

The Feasibility of Trigonometric Height Survey for Replacement of Order Levelingin Wide Network of Rivers

HAO Chuan-cai, LIU Cheng-long

2002, 15(6): 637-641.

[Abstract](1180)

Abstract:
Based on a statistics analysis of the experimental data of trigonometric leveling networks at four extra-long bridges such as the Humen bridge, etc., comparisons are made in forward and backward altitude differences, loop closures, the third-and the fourth-grade-leveling surveys difference limitatio...

An Isotropic Viscoelastic Model Coupled with Hydrothermal Effects

WANG Jun, YANG Fan, CHEN Da-peng

2002, 15(6): 642-646.

[Abstract](1269)

Abstract:
To characterize the behavior of polymers and the mutual influences among moisture, temperature, and stress in polymers, a constitutive equation for isotropic viscoelastic materials, with a coupling among behaviors of moisture diffusion, heat conduction and mechanical deformation, is developed using ...

A Monte-Carlo Stochastic FEM Based on Conjugate Gradients Method

YANG Jie, CHEN Qiu

2002, 15(6): 647-650.

[Abstract](1656)

Abstract:
An improved Monte-Carlo stochastic FEM based on polynomial preconditioners is established through introduction of the conjugate gradients method into the traditional Monte-Carlo stochastic FEM. In the improved FEM, a certain characteristic sample is obtained first; then, using it as a preconditioner...

The Coupling Relation Between Structural Parameters and Dynamic Indexes of Gantry Crane

CHENG Wen-ming, WANG Jin-nuo, DENG Bin

2002, 15(6): 651-654.

[Abstract](1392)

Abstract:
According to the characteristics of the existing serial elastic dynamic vibration model of three masses and three degrees of freedom for a gantry crane with elastic trolley frame, the numerical solutions to the dynamic behaviors of the system are obtained through modal analysis. The coupling relatio...

Calculation of Stress Intensity Factors for Cracked Diesel Engine Crankshafts

WANG Guang-qin, LI Xing-ren, GAO Qing

2002, 15(6): 655-658.

[Abstract](1408)

Abstract:
Astress analysis of a diesel engine crankshaft is made by FEM based on dynamics analysis to determine the position of the initial crack and its propagation direction. The stress intensity factors of the cracks at various depths are calculated using displacement method on a substructure model, thereb...

Selection of the Learning Samples of Neural Networks for Internal-Combustion Engine Emission

ZHOU Bin, LI Yu-mei, SHIGA Seiichi

2002, 15(6): 659-663.

[Abstract](1501)

Abstract:
According to the variation characteristics of the operating condition of internal- combustion engines, an improved orthogonal design method which considers the changes on factor boundary is proposed to choose learning samples of neural networks. The results show that the forecasting precision of the...

Dynamic Performances of the Bogie with Magnetic Fluid Coupled Wheelsets

CHI Mao-ru, WANG Kai-wen, ZHANG Wei-hua

2002, 15(6): 664-668.

[Abstract](1716)

Abstract:
A dynamic calculation model for vehicles with magnetic fluid coupled wheelsets is established. Using numerical method, a dynamic simulation is made of the dynamic performances of a bogie equipped with magnetic fluid coupled wheelsets, and the influences of the front and rear magnetic fluid wheelsets...

A Distributed Visual Simulation System for Train Simulators

SUHu, ZHOU Mei-yu

2002, 15(6): 669-672.

[Abstract](1399)

Abstract:
A multi-channeled visual simulation system is developed for train simulators. In the system, the real-time rendering of three channel output images of the scenes a train passes by is performed through the parallel computation on three networked PCs. The structure, implementation and experimental res...

New Approaches for Improving Detection Efficiency of Intrusion Detection Systems

DAI Yun, FANPing-zhi

2002, 15(6): 673-676.

[Abstract](1473)

Abstract:
The growth of network bandwidth requires that intrusion detection systems (IDSs) have higher performances than ever. In this paper, two efficiency detecting approaches of IDSs are presented. One is to use an IDS traffic controller managed by an appropriate traffic control strategy to perform payload...

An Immune Optimal Algorithm and Its Application

SU Cai-hong, ZHUXue-feng, MAO Zong-yuan

2002, 15(6): 677-680.

[Abstract](1389)

Abstract:
An immune algorithm of a mathematically optimal structure model is derived based on the natural immune system mechanism. The algorithm combines the evolution function of traditional genetic algorithms and the density mechanism in creatures’immune procedure. The adjustment of antibodies is realized b...

A Precise Analysis of Performances of Receivers in CDMA Systems

LIU Wei, ZHU Chang-qian

2002, 15(6): 681-683.

[Abstract](1113)

Abstract:
Considering the limitation of the method based on Gaussian approximation for analysis of multi-user systems, a precise analysis is made of the performances of the receivers in CDMA systems, and the curves of bit error rate (BER) are obtained for the systems. A numerical simulation shows that the pre...

Taylor Series Expansion Method and Its Performance Analysis

LI Li, DENG Ping, LIU Lin

2002, 15(6): 684-688.

[Abstract](1217)

Abstract:
The channel model suitable for TDOA techniques is discussed, and the typical location TDOA algorithm, Taylor series expansion method, is analyzed. The traditional Taylor series expansion method is improved by solving its convergence problem. Then, the performances of the improved method are simulate...

Microwave Image Reconstruction of a Perfectly Conduction Cylinder by Real-Coded Genetic Algorithm

ZHONG Xuan-ming, LIAO Cheng, YANG Dan, YANG Zhou-bing, MENG Fan-bao

2002, 15(6): 689-692.

[Abstract](1447)

Abstract:
A microwave imaging approach based on real-coded genetic algorithm for a perfectly conduction cylinder in free space is presented. The contour of the cylinder is expressed by a shape function which is approximated by trigonometric series. The scattering problem is simulated by point-matching moment ...

Parameter Analyses in the Model of Profit Sharing and Valuation of Technical Assets

FAN Li-li, WUNa, MA Yue

2002, 15(6): 693-697.

[Abstract](1355)

Abstract:
The accuracy of the income allotment algorithmic model used for evaluation of technical assets is dependent on the determination of each parameter, and this is also a problem that is easy to arouse controversies. A way for calculating the income allotment proportion in the pricing model of income se...

A Multidimensional Game Model and Its Equilibrium in Bertrand Duopoly

TAN De-qing, HUPei, OUYANG Yan-kun

2002, 15(6): 698-702.

[Abstract](1318)

Abstract:
According to the phenomena of games among corporations in economic activities, the paper puts forwards a concept of multidimensional game, then describes its characteristics and strategy forms and extends the Nash equilibrium to the multidimensional Nash equilibrium. Meanwhile, a two-dimensional sta...

Evaluation of the Scientific and Technological Advancement of Western China

LUO Li, HUXiu-qiang

2002, 15(6): 703-708.

[Abstract](1075)

Abstract:
An improved DEA (Data Envelopment Analysis) method is used to evaluate the scientific and technological advancement of western China. The advancement rates of production technology, efficiency, and science and technology in different regions of western China from 1997 to 1999 are calculated, and the...

Customer Satisfaction Based on Limited Rationality and the Strategies

CHENXu, WUZhen-ye

2002, 15(6): 709-714.

[Abstract](1355)

Abstract:
Customer satisfaction is an important measure to improve the competitive power of enterprises. This paper begins with a summary of theoretical researches on customer satisfaction at home and abroad, followed by a discussion on the essential implication of customer and customer satisfaction based on ...

Rational Number of Station Tracks in Single-Track Railway

WANG Jian-jun, JIAHua-qiang

2002, 15(6): 715-718.

[Abstract](1548)

Abstract:
Using the simple analysis model, queuing analysis model and simulation analysis model respectively, analyses are made of the number of tracks in various types of stations such as technical service stations, the two stations at the ends of a limiting section, and the general passing stations. It is c...

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2002 Vol. 15, No. 6