西南交通大学学报

On Developing H igh-Speed Evacuated Tube Transportation in China

SHEN Zhi-yun

2005, 18(2): 133-137.

[Abstract](1474)

Abstract:
The necessity and feasibility of evacuated tube high-speed transportation were discussed. The fundamental problems of this technology, e. g. pressure in the tube, coefficient of coverage and other related techniques, were analyzed in detai.l More discussed were the strategy and technical choice ofde...

Experimental Investigation on Reducing Gounding-Resistance in PerennialFrozen SedimentAreas

WUGuang-ning, ZHANG Jun, FULong-hai, WANGHao

2005, 18(2): 138-142.

[Abstract](1061)

Abstract:
To solve the problem ofgrounding for lighting along theQinghai-Tibetrailway, experiments were conducted in an perennial frozen sediment area, where there were similar environments as the sections of theQinghai-Tibetrailway. The factors affecting the resistivity of frozen soilswere discussed, and som...

Simple Adaptive Control for Constant Tension of Double Stand Revere Cold-RollingM ill

AN Shi-qi, SUN Yi-kang, WANG Jing

2005, 18(2): 142-146.

[Abstract](1359)

Abstract:
A simple adaptive control system was designed for constant tension of double stand revere cold rolling mil.l This system contains two inner loops for current and velocity control using PI regulators; its outer loop is for tension control using simple adaptive controller. Simulation results indicate ...

M odel and Algorithm for Train Operation Adjustment on Single-Track Railways Based on Genetic Algorithm

ZHANG You-shi, JINWei-dong

2005, 18(2): 147-153.

[Abstract](1682)

Abstract:
The conceptof“adjacent train”was introduced to build a new model for train operation adjustmenton single-track railways based on their operational characteristics. Since the solution space of themodel is too large to be searchedwith conventionaloperational research (OR) technique, a new algorithm ba...

Improvement ofTransientResponse Performances of M icroprocessor Voltage Regulator

WANG Feng-yan, XU Jian-ping, WU Song-rong, XU Jun-feng

2005, 18(2): 153-157.

[Abstract](1322)

Abstract:
The transient responses of voltage regulator (VR) to sudden load changes and the parameters of aVR affecting the transient response of output voltage were analyzed to achieve a VR with fast transient responses. The analyses show that using a low equivalent series resistance (ESR) capacitorwith a car...

OperationalEquation and Setting ofDifferentialProtection for Impedance-M atching Balance Transformer

LUTao

2005, 18(2): 158-162.

[Abstract](1245)

Abstract:
If impedance matching coefficientKZ≠3 + 1 for an impedance-matching balance transformer with differential protection based on phase current on primary side, there is inherent differential curren,t andmay result inmal-operation. Thisproblem was solved by taking the differences in phase currenton prim...

NeuralChebyshev OrthogonalPolynom ialEqualizer and ItsAdaptive Algorithm

DENGXiao-hong, ZHANG Jia-shu

2005, 18(2): 163-168.

[Abstract](1383)

Abstract:
A new structure of nonlinear equalizer-neural Chebyshev orthogonal polynomial adaptive equalizerwasproposed. It is composed ofa nonlinearneuraladaptive filterand aChebyshev orthogonal polynomial filter. The corresponding adaptive algorithm was derived based on the steepest descent method. Simulation...

Vision Subsystem and Identification Algorithm for M iroSotLarge Field Soccer-Robot System

PENG Qiang, JIANGHao

2005, 18(2): 168-172.

[Abstract](1387)

Abstract:
Tomeet the high controlaccuracy of the vision subsystem ofaMiroSot(Micro-RobotWorld SoccerTournament) large league system, a computer vision subsystem and a robot/ball identification algorithm were described. The vision subsystem was developed forMiroSotLarge League 11 vs. 11 for FIRA (Federation of...

Sparse Decomposition Based on StructuralProperties ofAtom Dictionary

YIN Zhong-ke, WANG Jian-ying, SHAO Jun

2005, 18(2): 173-178.

[Abstract](1452)

Abstract:
A new sparse decomposition algorithm was proposed bymodifyingmatching pursuit (MP) andmaking fulluse of the structural properties of the over-complete atom dictionary in signal sparse decomposition. The new algorithm deliberately balances the computing speed and required memory. The speed of the new...

H igh-DimensionalAffine Codes

LIUXiu-feng, ZHANG Ai-li

2005, 18(2): 179-183.

[Abstract](1266)

Abstract:
High-dimensional affine codes were constructed using weak block designs, where thes- dimensional cosetofs-dimensional affine geometryG (m, p)over a finite fieldFpwas taken as an informationalbi,t and everys-dimensional coset family corresponding each elementwas regarded as a check line. The codes ar...

GDOP Performance Analysis ofCellular Location System

DENG Ping, YULi-jian

2005, 18(2): 184-188.

[Abstract](1129)

Abstract:
The relation betweenGDOP (geometry dilution ofposition) and BS (base station) number at the center of a polygon was derived with and without the correlativity between TDOA ( time difference of arrival) measurements considered. A GDOP method for computing TDOA and TDOA/ AOA (angle of arrival) under N...

Multi-Intersected Copy Replication Based on ParallelLink

KOUWei-hua, JIAXing-min, XU Yang

2005, 18(2): 189-194.

[Abstract](1258)

Abstract:
To eliminate overlapping data spreading repeatedly and nonupdated data spreading, and to replicatemulti-intersected copy in parallel links, based on the state of copy replication on every node in parallel links, the following three strategies were proposed: twice-spread once-replication, twice- spre...

Analysis for Dynam ic Properties ofM odelArch Structure ofConcrete-Filled SteelTube

XIONG Feng, LIUHao-wu

2005, 18(2): 195-199.

[Abstract](1467)

Abstract:
The natural frequencies of amodel arch structure of concrete-filled steel tube were got by shaking table tests. In addition, a structural analysis software SAP2000 and the finite elementmethod were used to obtain the natural frequencies and vibration modes of the structure. In the numerical analysis...

Stationary Stochastic Response ofCFST Arch Bridge to Multi-component Seism ic Excitation

ZHAO Can-hui, ZHOUZhi-xiang

2005, 18(2): 200-204.

[Abstract](1676)

Abstract:
The response of concrete-filled steel tube (CFST) arch bridges tomulti-componentseismic excitation and its calculation were investigated using the theory of random vibration. A pseudo- excitation method for multi-component seismic excitation was proposed, the stationary stochastic response ofCFST ar...

Stress Increment ofExternally Pre-stressed Tendons of Three-Span Continuous Concrete Beam swith Varying Section

YANG Li, ZHAO Ren-da, ZHANGXiao-yong

2005, 18(2): 205-209.

[Abstract](1484)

Abstract:
Based on the experimental resultof4 three-span externally pre-stressed concrete continuous beamswith different pre-stress degrees, reinforcement ratios and sections, the stress increment of externally pre-stressed tendonswas investigated. The result shows that the stress increment is directly propor...

Reliability Calibration ofComposite Beam Section Based on European Standard

XUHai-qing

2005, 18(2): 210-215.

[Abstract](1360)

Abstract:
The necessary safety factor ofcomposite beam section in an ultimate limitstate (ULS) was investigated for the goal reliability indexβ= 4. 7. A composite beam section designed according to European standard EC 4 (Euro code 4) was calibrated and its actual safety factor in the ultimate limit statewas ...

LongitudinalCurve Design ofCable Saddles in Suspension Bridge

WEIJian-dong, XUWei-guo, LIUZhong-yu

2005, 18(2): 215-219.

[Abstract](1448)

Abstract:
To reasonably design the longitudinal curves of cable saddles and improve the control precision in construction, the design of longitudinal curves composed of compound arcswas developed based on the analytical solutions for elastic catenary. Under the condition of given distances or horizontal dista...

Dynam ic StressM easurement and Analysis of Subgrade-Culvert Transition Section on Q inhuangdao-Shenyang Passenger SpecialLine

HUANG Wan-qing, LU Yang, LUO Shu-xue, CHEN Cheng-die

2005, 18(2): 220-223.

[Abstract](1607)

Abstract:
Dynamic soil stress of a subgrade-culvert transition section from DK49+689. 0 toDK49+ 700. 7 on theQinhuangdao-Shenyang passenger special linewasmeasured and its influencing factors, including train speed, structural changes and soil depth, were analyzed. The results indicate that dynamic earth pres...

Effects ofCrosswinds on Curve Negotiation ofH igh-Speed Power Cars

WANG Yong-guan, CHENKang

2005, 18(2): 224-227.

[Abstract](1681)

Abstract:
The aerodynamic lift forces, lateral forces and rolling moment on high-speed power cars were investigated experimentally to study the effects of crosswinds on the aerodynamics of EMU (electricmultiple unit). The dynamics of curve negotiation ofhigh-speed power carunder crosswinds was analyzed using ...

Experimental Investigation on Spalling ofRailway CarW heels

WANG Wen-jian　LIUQi-yue

2005, 18(2): 228-231.

[Abstract](1293)

Abstract:
Spalling and wear behaviors of four kinds of wheel steels with different carbon concentrationswere investigated on JD-1 wheel-rail simulating testmachine underHertzian contact condition. The results show tha,t with an increase in carbon concentration, thewear volume ofwheel decreases; but the degree...

Starting Control ofAMT with Adaptive Temperature Compensation

YINXiao-feng, TAN Jing-xing

2005, 18(2): 232-236.

[Abstract](1425)

Abstract:
The engagement-speed of clutch was determined with a weighted method based on the starting performance indices of AMT (automated mechanical transmission) and torque-transferring characteristics of clutch. In the method, the driver s intention and the requirements of starting performances are taken i...

Positioning ofM oving Table for Checking Screw Holes of Nuclear Reactor Pressure Vessel

TANG Lan, CHEN Chong, LISheng

2005, 18(2): 237-240.

[Abstract](1334)

Abstract:
To inspect the defects on the screw hole surfaces of nuclear reactor pressure vessel in nuclear power station, an automatic moving table was designed to carry sophisticated inspecting devices. Its precise positioningwas successfully realized by determining the positionsof the screw holes in the flan...

Optim ization ofM ilitary Transportation Routes Based on Genetic Algorithm

SHIYu-feng, SU Shi, PENG Qi-yuan

2005, 18(2): 241-243.

[Abstract](1597)

Abstract:
On the basis of establishing the optimalmodel ofmilitary transportation routes, a genetic algorithm was designed to obtain the routewith aminimum generalized weigh.t To solve the problems of“necessity-nodes”,i. e., the nodes amilitary transportation routemustpass, and order preserving ofnodes, the r...

ForecastM odel ofRoad Section Traffic Flow Based onM aximum Likelihood Estimation

LIU Shi-chao

2005, 18(2): 245-248.

[Abstract](1514)

Abstract:
Based on analyzing the shortcoming of present traffic flow forecasting, the maximum likelihood estimationwasused to forecastthe traffic flow ofroad sections. The essence of thismethod is thatupstream observationalvariables in a successional time region are looked as explanatory variables, and the ma...

User-Based Structure Configuration of Comprehensive Transportation Corridor

LIDe-gang, LUO Xia

2005, 18(2): 249-253.

[Abstract](1232)

Abstract:
The limitations of the traditionalmethods of corridor structure configuration were analyzed based on the characters ofdemand and supply ofusers in a comprehensive transportation corridor. The corridor structure was defined from point of view of users, a multidimensional Logit function of transportat...

JointOptimalDecision-M akingM odel Based on Supply ChainM anagement

TIAN Jun

2005, 18(2): 254-258.

[Abstract](1619)

Abstract:
To encourage the firmswithmerits and prevent the enterprises from gaining colossalprofits, the problem of jointoptimal decision-making of supply chain constructed by cooperative suppliers and submitters in the situation ofhaving no discountwas discussed. A jointoptimaldecision-makingmodel of the sup...

Strategic Information System s Planning Method Based on Core Competence

XUZuo-ning, LITao, WUZhen-ye

2005, 18(2): 259-263.

[Abstract](1303)

Abstract:
A new strategic information systems planningmethodwas put forward to raise the efficiency and effectiveness of planning. Based on the core competence theory of competitive advantage, this method insists thatbusiness strategies planning should be integrated with strategic information systems planning...

W eight Syncretizing forMultiattribute Decision- M aking withoutDecision Attribute

JIANMing, HUANG Ding-xuan, WUZhen-ye

2005, 18(2): 264-268.

[Abstract](1641)

Abstract:
A syncretized weight allocation method was proposed to overcome the limitations of two weight allocation methods of multiattribute decision-making without decision attribute,i. e., the impersonal method and the subjective method. To obtain the optimal weight integration between subjectiveweights and...

Lattice Ordering of Incomplete Lattice

GUO Chun-xiang, GUO Yao-huang

2005, 18(2): 269-272.

[Abstract](1214)

Abstract:
A problem in the lattice orderdecision-making theory,i. e., the structure of lattice order is incomplete, was investigated. By defining the regulation ofdetermining key elements and theminimal decision se,t a method was given to directly work out join-and meet-irreducible elements of the smallest co...

Solving Herm ite Interpolation Functionswith theM ethod ofDivided Difference at the Same Node

FENG Tian-xiang

2005, 18(2): 273-277.

[Abstract](1273)

Abstract:
To solve cubic-Hermite interpolation functions, the method of divided difference at same nodewas used, and the result similar toNewton s interpolation function was obtained. The proposed method ismuch simpler comparedwith Lagrange interpolationwith base function. An error formula for cubic-Hermite s...

Research onM onitoringM ethod for Nitrite and Nitrate in EnvironmentalW ater

GONG Zheng-jun, ZHANG Zhu-jun

2005, 18(2): 277-280.

[Abstract](1350)

Abstract:
An experiment shows that nitrate can be reduced to nitrite by spongiform zinc-cadmium reducer. Based on the experimental resul,t the chemiluminescence of hydrogen dioxide and luminol solutionwas used to the on-line analysis ofnitrite and nitrate. As a resul,t a new chemiluminescence method for the s...

Callus Induction and PlantRegeneration from Bulbs of Fritillaria thunbergiiM iq.

YUAN Yi, LINHong-hui, WANG Wan-jun, LIPing

2005, 18(2): 281-284.

[Abstract](1018)

Abstract:
The effects ofmediums, phytohormones and phytohormone combinations on induction of calluses and protocorm-like bodies (PLBs) from the explants of bulbs ofFritillaria thunbergiiMiq.. The induction ofcalluses and PLBs is closely related tomedium, hormone combination and the type of the explants. The b...

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2005 Vol. 18, No. 2