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15 October 2007, Volume 26 Issue 5 Previous Issue    Next Issue

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Seismic Response Analysis of Long-Span CFST Deck--Type Arch Bridge ZHAO Can-hui ，ZHOU Zhi-xiang 2007, 26(5): 1-4.  Abstract ( )   PDF (279KB) ( )   Seismic response behaviors of long-span concrete filled in steel tube(CFST)deck-type arch bridge were investigated.The free vibration specialty between half-through CFST arch bridge and CFST deck-type arch bridge was contrasted.The seismic response behaviors of CFST deck-type arch bridge subjected to longitudinal excitation，vertical excitation and lateral excitation were analyzed by time-history analysis method.The effect of multi-support excitation was also discussed，and the seismic response specialty was contrasted between CFST deck-type arch bridge and CFST half-through arch bridge. References | Related Articles | Metrics

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Analysis of Shrinkage and Creep on Self-Anchored Suspension Bridge HU Jian-hua ，TANG Mao-lin ,LIU Rong ，WANG Zhong-bin 2007, 26(5): 5-8.  Abstract ( )   PDF (285KB) ( )   Because the self-anchored suspension bridge adopts reinforced concrete or prestressed concrete members and its cables are anchored on the stifening girder，the shrinkage and creep of stifening girder and bridge tower will induce the changes of internal forces of cables and hangers，which results in the redistribution of action efects and reactions and the transformation of structure state.So the influence of concrete shrinkage and creep must be taken into account in the design of stmcture.The initial strain method was adopted to deduce the finite element expression of shrinkage and creep efects on the structure while taking the age of loading into account，and a programme was compiled by FORTRAN.Taking Pingsheng Bridge of Guangdong as an examples，the analysis of shrinkage and creep on self-anchored suspension bridge was carried on after bridge finished. References | Related Articles | Metrics

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Effect of Diaphragm on Distortion of Steel Box Girder LIU Xiao-yu，SUN Tong-ling 2007, 26(5): 9-12.  Abstract ( )   PDF (233KB) ( )   When applying the load onto the girder，its section may be distorted，and the girder may lead to partial flection，web plate crumple，and so on due to the reason that the top plate，bottom plate and web plate of the steel box girder are very thin.In that case，in order to improve the carrying capacity of the steel box girder，itg better to set enough stifening rib in the box girder.The distort efect of the diaphragm on the steel box girder was discussed. References | Related Articles | Metrics

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Application of Neural Network Method to Parameters Identification of Shibanpo Bridge in Chongqing LI Xi，GU An-bang，QIAO Wei-guo 2007, 26(5): 13-16.  Abstract ( )   PDF (275KB) ( )   With the capacity of adaptive self-study，non-linear representation，good robusticity and error tolerance as well as rapid convergence，BP neural network could efectively solve the core problem of parameters identification in the construction of continuous rigid flame bridge.Through the example，a conclusion is drawn that the result of parameters estimation using BP network is very identical with the measure，which has practical significance with satisfactory accuracy.If the accuracy in the classic method is rather low especially in problems with non-linear and uncertain system control and SO on，the BP neural network can be used well. References | Related Articles | Metrics

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Determination of Cable Forces in Completion State with ANSYS WANG Wei-sheng,ZHAO Rong-gao,LI Feng-hui 2007, 26(5): 17-20.  Abstract ( )   PDF (205KB) ( )   A comprehensive method to determine cable forces was put forward.The cable forces in completion state was determined with the method using the APDL in ANSYS.There Was little diference between the forces and designed results. References | Related Articles | Metrics

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Spatial Simulation Analysis of PC Continuous Rigid Frame Bridge Construction WANG Yun-tao，WANG Wei-hong，CHEN Yu-feng，GU An-bang 2007, 26(5): 21-24.  Abstract ( )   PDF (263KB) ( )   The box girder bridge is a spatial structure resisting a combination of tension，compression，bending，shear，and torsion forces，whose deformation and stress are very complex，especially in the long-span PC continuous rigid frame bridges. The authors have achieved the spatial simulation analysis of the construction of the Baiguodu Jialing River Bridge，which is located at Hechuan in Chongqing.Under the secondary development in ANSYS program.It's very useful in further understanding the similar bridge's actual stress distribution. References | Related Articles | Metrics

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Analysis of Bridge Impact Coefi cient Influence Factor and the Deviation Formation WANG Hai-cheng，SHI Shang-wei 2007, 26(5): 25-28.  Abstract ( )   PDF (231KB) ( )   The influence factors of vehicles impacting the bridges are complicated.At present，it rather dificult to solve the problem just by theory analysis.Before the analyzing method based on the probability theory accomplishing and the statistice work according on the coeficient finishing.it's better to adopt the experiment to reflect the results approxinately through expe- riential“impact coefficient”formula.In terms of a dynamic test upon a typical arch bridge，the imfluence factors that cause the exceptional impact coefficient are analyzed and discussed，the reasons why there is obvious diference between the measured value and standard one are discussed，with the hope to give some useful reference. References | Related Articles | Metrics

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Anti-Seismic Analysis and Anti—Seismic Measures for Yuxi Bridge GUO Xiang-ming，XIAO Sheng-xie，SUI Yan-chun，HAO Yan-guang 2007, 26(5): 29-31.  Abstract ( )   PDF (155KB) ( )   The model for Yuxi bridge was constructed on the basis of ANSYS.The research for the dynamic characteristics was made by mode analysis.Taking the arch crown and quarter section of the arch ring as key sections，by exerting Taft seis- mic wave on the bridge，the stress，displacement and the maximal moment of key sections were computated by the time-history analysis and the TMD equipment was used to reduce the seismic intensity. References | Related Articles | Metrics

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Probability-Based Bridge Deterioration Model and Maintenance Strategy Relations SHAO Xu-dong ，LIU Xin-hua ，LIU Dai-quan ，PENG Jian-xin 2007, 26(5): 32-36.  Abstract ( )   PDF (328KB) ( )   Bridge structure resistance always reduces as time goes by under atmospheric attacks，and its performance deteriorates gradually in the service time.The non-linear exponential deterioration model of reliability index and the non-linear deterioration modd of condition index were proposed.They could reflect the higher mode change rule in the deteriorated process.A series of formulas of reliabihty index and condition index were derived by considering two different cyclical preventive maintenanee strategies.The interaction between the bridge reliability index and condition index was investigated.This work can be taken as basis for bridge life assessment and prediction.and for making reasonable maintenance decisions. References | Related Articles | Metrics

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Concrete Creep Coeficient Fitting and Conjugate Gradient Method Solving ZHOU Shui-xing ，LI Feng-hui ，CHEN Shan-lin 2007, 26(5): 37-39.  Abstract ( )   PDF (161KB) ( )   According to the creep characteristic of concrete，the exponential function was selected as base function，which could construct the prevalent Diriehlet series so as to fit creep coeficient．For the actual variables more than unknown ones， conjugate gradient method Was adopted to solve the equations．Furthermore，the creep experiment data from reference were fitted by this method．The results showed that the fitted values were in good agreement with the experimental data．At last， the choice method of initial value in Dirichlet series was discussed． References | Related Articles | Metrics

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Stability Analysis of Concrte—Filled Steel Tube Arch Bridge in Construction Stage XIAO Guang-hong ，ZHANG Qiu-1ing 2007, 26(5): 40-43.  Abstract ( )   PDF (205KB) ( )   The model of Yonghe Bridge was built and the comparison between linear analysis an d non-·linear analysis was con-· ducted by the software MSC Nastran．The results show that it is practical to evaluate the stability of the concrete-filled steel tube arch bridge with non-linear analysis． References | Related Articles | Metrics

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Study on Construction Orders of Simply Supported-Continuous System MA Wen-yan，XIANG Zhong-fu，CHEN Shan-qin 2007, 26(5): 44-48.  Abstract ( )   PDF (306KB) ( )   The constructing procedure of the monolithic layer and the wet joints of the girders and the orders of straining the pre·stress force are the key orders of the simply supported-continuous system．The orders of the monolithic layer and the wet joints of the girders are studied with practical project，and a limited element model was established to analyse the order of the wet joints of the girders and straining pre-stress force to the structure．Through the contrasting analysis，an elementary discus- sion of mechanics and construction Was made towards the prc·-stress simply supported·-continuous system with the hope to better serve the pmject． References | Related Articles | Metrics

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Evaluation of Cutting and Tunnel Alternative for Freeway Project through Red-Bed Soft Rock Region in Western China LIU Yan ，WU Guo-xiong ，ZHU Xiao-rong ，LIU Jian-feng 2007, 26(5): 49-52.  Abstract ( )   PDF (273KB) ( )   Considering the engineering performance of the red-bed soft rock，based on a wide investigation and a technical and economic study of existing freeway project in several provinces in western China red-bed soft rock area，a comprehensive evaluation indicator system was established for cutting and tunnel ahernative assessment with gray relational analysis method． The objective of the research is mainly to get the critical height between cutting and tunnel in order to determine which alternative could be used rationally between cutting and tunne1．The result provides helpful reference for decision-making in freeway design and construction in red-bed soft rock area along a cutting segment． References | Related Articles | Metrics

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Application of Fuzzy Mathematics to Alignment Optimization Design of Interchange Ramp ZH0U Lin 2007, 26(5): 53-55.  Abstract ( )   PDF (208KB) ( )   Applying the conceptions and principles of fuzzy mathematics to the alignment design of interchange ramp，the circle curve and relaxation curve was considered as align ment units which constitute interchange alignment.The driving condition，align ment geometry，superelevation and fuzziness of the factors that influenced the determination of the parameters were considered too．A fuzzy optimization design method is put forward which is more reasonable than traditional design methods.The fuzzy optimization model and its solution are estabhshed． References | Related Articles | Metrics

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Proportion Designing Method for Pavement Concrete Added with Mineral Admixtures WANG Rui-yan ；WU Guo-xiong ，YOU Feng 2007, 26(5): 56-57.  Abstract ( )   PDF (160KB) ( )   By establishing plural linear equation，the influences of diferent kinds and quantities of mineral admixtures on the flexural strength of pavement were evaluated．This will have a good guiding function to ratio designing of road concrete added with mixtures． References | Related Articles | Metrics

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Study on Fire Resistance Design Parameters of RC Structure WANG Xiao-dong ，LU Ai-ben ，YANG Xiao-bo ，LABA Dun-zhu 2007, 26(5): 58-60.  Abstract ( )   PDF (217KB) ( )   By analyzing the randomness and the sensitiveness of design parameters on the fire resistance ability of RC structure， that the thickness of covering layer is the most sensitive parameter is indicated，and also the stochastic finite element re． 1iability computing method is introduced． References | Related Articles | Metrics

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Fracture Mechanism and Simulation of Cracks on the Bottom of Concrete Slab under Water Pressure Effect ZHANG Tie-Fu ，YANG Qing-guo ，YI Zhi-jian ，ZHAO Chao-hua ，GU Jian-Yi 2007, 26(5): 61-63.  Abstract ( )   PDF (219KB) ( )   With the action of trafic load and temperature，defects and cracks emcee on the bottom of tile concrete pavement slabs．Accompanied with the failure of the stuffing，water may be accumulated under the slabs，and because of tile high speed traffic load，the water pressure will reach to a large extent．To the cracks on tile bottom of the slabs，the efect of water is just like the uniform forces assigned on the crack face which lead to the cracks to split．With fracture mechanics，the prin- ciples of the split effect of water was disclosed；meanwhile ，from the view point of stress，the split efect of water pressure through plane finite element method was evaluated．The conclusion is useful and helpful to analyze the fracture of concrete slab． References | Related Articles | Metrics

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Application of Multi-Head Breaker Rubblization Technology to Existing Concrete Pavement Rehabilitation Reconstruction HE Ming ，GAO Yan-long ，HUANG Xin 2007, 26(5): 64-67.  Abstract ( )   PDF (329KB) ( )   Based on a test road construction which the author participated in，by testing multiple test indices such as settle- ment，deflection，modulus of resilience，and by using advanced testing instruments such as surface wave meter and radar，the multiple head bleaker technology is described and evaluated．A deep and thorough exploration on the application of multiple head breaker technology to old concrete pavement retrofitting and crushing is achieved，which provides strong support for sci- entific research，design and construction on old concrete pavement retrofitting． References | Related Articles | Metrics

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Research on Construction of Synchronous Crushed Stone Seal CHEN Fu-qiang，FAN Tong-jiang，JIA Jing-peng，ZHANG Yang，XU Dong-liang 2007, 26(5): 68-71.  Abstract ( )   PDF (359KB) ( )   Synchronous crushed stone seal technology and its main performance are introduced．Based on an experimental engineering，the construction principles and some serious problems are analyzed．Meanwhile，some advices are showed to improve the construction of synchronous crushed stone sea1．It aims to help in further studies of syn chronous crushed stone sea1． References | Related Articles | Metrics

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Applied Research on Modified Asphalt Friction Surface HU Si-wei ，YUAN Wan-jie 2007, 26(5): 72-76.  Abstract ( )   PDF (294KB) ( )   According to the service conditions of modified asphalt friction surface in rainy humid areas of the south，the aggregate grading design range applicable for modified asphalt friction surface is put forward，which conforms to the aggregate grading range of the type AC-13 in Technical Specifications for Construction of Highway Asphalt Pavements(JTJ F40-2004)．At the same time．the basic design method of aggregate grading and the appropriate construction technology are presented to increase the water stability and the surface texture depth of asphalt friction surface． References | Related Articles | Metrics

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Studies on Performance and Storage Stability of Modified Asphalt Emulsion MA Yu 2007, 26(5): 77-79.  Abstract ( )   PDF (253KB) ( )   A method for preparing the modified emulsified asplmh of styrene butadiene styrene periodic copolymer(SBS)was developed with colloidal mil1．The penetration，softening point，ductility and elastic recovery of the residue on evaporation of the mod ified emulsified asphalt were determined． The microcosmic form and the storage stability of the emulsion were re． searched．The results showed that：the perform ance of the prod uct of this method was very god and conform ed to the standard of heavy tra~ c road：with the content of SBS at 3％ ，the modified asphalt emulsion was wel distributed，the middie size was smaler，an d the store stability was satisfied． References | Related Articles | Metrics

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Stability Analysis of Embankment Reinforced with Geosynthetics JIANG Xin ，LING Jian-ming ，QIU Yan-jun 2007, 26(5): 80-83.  Abstract ( )   PDF (312KB) ( )   Stability analysis of embankment reinforced with geosyntheties has been a great concern for highway engineers．To overcome some disadvantages of traditional limit equilibrium method(LEM)，based on the shear strength reduction method (SSRM)，Phase7．V6．0，a commercial software written for geotechnieal engineering Was performed to analyze the slide be- havior of embankment reinforced with geosyntheties． References | Related Articles | Metrics

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Analysis of Anti-Cracking And Tenacity Increasing Mechanism of Flexible Fiber Cemen-Stabilized Material Semi-Rigid Base MA Yin-hua，YI Zhi-jian，YANG Qing-guo 2007, 26(5): 84-86.  Abstract ( )   PDF (280KB) ( )   In virtue of fracture mechanics，the authors analyzed the anti-cracking and tenacity increasing mechanism of flexi- ble fiber in flexible fiber cement-stabilized material semi-ri6d base，and carried out a relevant experimental study.The analysis and experimental stray show that the flexible fiber cement-stabilized material is a new semi-rigid base with eminent anti- crack，anti-shrinkage，anti-fatigue，anti-impact performance and good tenacity.Application of this new style base will resolve the early age cracking of the existing bases efectively，improve the service-life of pavement structure impressively and have a notable impact on economic eficiency and social importance. References | Related Articles | Metrics

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Site Test and Numerical Analysis of Dynanlic Consolidation Method for High Earth Fill ZHOU Shi-liang ，WANG Duo-yin ，WU You-ren 2007, 26(5): 87-91.  Abstract ( )   PDF (425KB) ( )   A site test of dynamic consolidation for high earth fill of Chongqing Jiangbei Jialing River flood embankment engi- neering was introduced，and the process of dynamic consolidation was simulated by FEM．The numerical an alysis results are basically consistent with those of site tests．It could be seen that a biggish settlement deformation Was produced in soil by dynamic consolidation，and the consistency and bearing capacity of soil advanced to a great extent．At the Salne time，it indicates that numerical analysis for dynamic consolidation by FEM is feasible，and it could preferably simulate the elasto-plastic dynamic response of higll each fill ranlmed by impact load． References | Related Articles | Metrics

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Classification of High-Cutting Slope along Road and Its Failure Models CHEN Hong-kai，YANG Shi-sheng，YE Si-qiao，LI Ming 2007, 26(5): 92-96.  Abstract ( )   PDF (325KB) ( )   At present，there isn't a uniform classification on the high-cutting slope along road．Therefore，this induces confu- sion in analyzing its failure models and reduces the pertinence and validity in governing the high-cutting slope along road．Ac- coming to control of rock fissure and easy identification in-situ，the authors classfied high-cutting slope along road 8．8 three big kinds and nine small kinds，and analysed the possible hflure models of every kind of high-cuting slope by lithology and its combination，rock fabric，rock intension，space between fissures，the relationship of fissures and slopes tend，the rela· tionship of fissures and slope's obliquity etc．Then four complex failure models of high-cutting slope are given：cuniform body-plane slide failure model，collapse-slide failure model，slide·tipping failure model，slide·crushing failure mod e1．These provide directions on stability analysis and recognizing of its failure fissures． References | Related Articles | Metrics

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Discussion on Confirming Shear Parameters of Rock Discontinuities of Slope LIU Ming-wei ,ZHENG Ying-ren 2007, 26(5): 97-102.  Abstract ( )   PDF (351KB) ( )   The shear parameters are often confirmed by the combination method of practical classification and engineer experi- ence．The national standard Technique Code for Building Slope Engineering(GB 50330-2002)is a practical classification method using willy，and it provides the shear parameters of rock discontinuities of slope．With the increasing in depth of re- searches into experiments of discontinuities and the wide application of the code．this practical classification method needs to be improved．Based on wide surveys，field tests and laboratory tests，the modification suggestion is proposed．The suggestion call make the method more reasonable to supervise the rock slope design． References | Related Articles | Metrics

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FEM Analysis of Sliding Face Crossing over Sinking Pile TANG Fen 2007, 26(5): 103-107.  Abstract ( )   PDF (357KB) ( )   The short anti-slide pile is one kind of special pile situated between the anti-slide tie and the long pile．On the suit- able position，sink piles may establish the safety coeficient which the design requests．Comparing with long pile，its internal force has lowered；therefore sinking pile has good applied foreground in the economical and experiencing force aspects．But the sliding body may follow crossing over pile and lose steady shear probably．the engineering ma y fail．The application would b_e greatly restricted then．Taking the land slide in Dazu Bank in Yunyang County betwen Taigongtuo and Yu Jiabao Bankas an ex- ample．the Strength Reduction FEM was applied to test whether the sliding face crossed over the pile with the short sinking piles． References | Related Articles | Metrics

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Technical Specification Adoption for Rural Road in Mountain Area of Chongqing FENG Xiao ，QIN Bo ，XU Yong 2007, 26(5): 108-111.  Abstract ( )   PDF (251KB) ( )   According to the survey of rural road and terrain，geological and economic conditions of mountain area in Chongqing，the technical specification adoption for rural road of mountain area in Chongqing are discussed and some prinei- ples for the adoption of technical specification are put forward． References | Related Articles | Metrics

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Study on Systematic Road Traffic Safety Management Mode YOU Hong，LUO Jun ，GAO Jian-ping 2007, 26(5): 112-116.  Abstract ( )   PDF (372KB) ( )   With the development of society and improvement of living standards，road trafic safety issues are getting more and more considerable．However，as one main part of road traffic，effqcient highway traffic safety management systems have not been established．Considering the current state of highway safety management in China，based on analysis of safety relation factors。and from the standpoint of curent status of highway trafic safety management，the systematic management mode is required.It contains three components：safety program leadership，operations manager and technical support，and implementation． The implementation of road safety management systems is also explored． References | Related Articles | Metrics

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Optimal In，centive for Transportation Management under Asymmetric Information LI Jian-zhang 2007, 26(5): 117-121.  Abstract ( )   PDF (266KB) ( )   Regarding the government as the principal，the transportation man ager as the agent，applying principal-agent theory of information economics，the optimal incentive mechanism was studied in the setup with adverse selection and moral hazard simultaneously．By constructing the model to nonlinear programming and using the Kuhn-Tucker theorem ，the explicit solution of the optimal incentive wage contracts was obtained in the situation which the less ability agents can catch up the more ability ones by working hard．These pool contracts indicate the incentive efect of the po st wage． References | Related Articles | Metrics

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Construction of Efi cacy Function in Engineering Cost Risk Estimation HUANG Xian-gui 2007, 26(5): 122-124.  Abstract ( )   PDF (185KB) ( )   The meaning of evaluating the accurate degree of risk estimation is analyzed．The author puts forward that the risk predictability should be regarded as an index to measure the degree of accuracy of predicting risk and the efect theories should taken as the foundation to construct the efect function of risk．Th e predictive result is evaluated too．which verifies the accuracy and the credibility of the risk estimate． References | Related Articles | Metrics

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Review of Studies on Filling and Emptying System of High Head Lock WANG Jun ，YANG Bin ，CHEN Ming-dong ，YANG Zhong-chao 2007, 26(5): 125-128.  Abstract ( )   PDF (272KB) ( )   River lock development is gradually developing towards the high-head lock．The authors review the studies on filing and emptying layout，hydraulic characteristic，pattern of energy dissipater，key technology ，and also introduce the construetive experiences and results on filling and emptying system of navigation lock in China，U.S.A.，Russia，etc． References | Related Articles | Metrics

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Stability Analysis of Protection Plate under the Action of Wave on Reservoir Bank XU Guang-xiang 2007, 26(5): 129-133.  Abstract ( )   PDF (254KB) ( )   By comparing the stability analysis of antiskid，antidumping and against floatation of protection plate between wave action and non-wave action in small wave height deep reservoir，the author found that the stability of protection plate under the action of wave significantly decreased．This is mainly caused by wave uplift pressure induced by wave current drawdown． Then the method of computing concrete slab thickness is brought forth． References | Related Articles | Metrics

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Corrosion Efect on Bridges Caused by Acid Fall in Three Gorges Reservoir Area ZHOU Fu-chun 2007, 26(5): 134-137.  Abstract ( )   PDF (259KB) ( )   Through the research on natural environment of Three Gorges Reservoir Area，some conclusions are drawn：acid fall is very frequent；some environment~ctors(especially hmnidity)of reservoir area may accelerate corrosion efect on bridges； the steel of bridges is corroded easily；the types of steel corrosion include the steel reinforcement corrosion of general concrete， the steel reinforcement corrosion of prestressed concrete and the COrOsion of other steel materials．In addition，concrete material of bridges occurs corosion efect with acid medium of its environment． References | Related Articles | Metrics

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Numerical Simulation of Flow Field around Three-Car Platoon WANG Jing yu ，LIU Chang ，LI Sheng ，HU Xing-jun 2007, 26(5): 138-141.  Abstract ( )   PDF (316KB) ( )   Based on auto—control，the MIRA simplified model was used as the object of Intelligent Vehicle System research， and the flow field around single car and three—car platoon were numerically simulated respectively，while the ground efect Was simulated by the moving wall boundary condition．The pressure distributions in symmetry section are shown．Comparing with the distribution of a single car，the situations are similar，but the positive pressure area of the two back cars’front part is evidendy weakened．There are two types of positions，the salne space and different space．Th e analysis of aerodynamics resistances shows that the two back cars’resistances are smaller than the leading car'S resistance and the average resistance fals a litde contrasting with the single car's resistance．The numerical simulations of flow field around three—car platon were carried out by changing the distance of cars．The rule of aerodynamics resistances of three cars platon influenced by space is found．It establishes the base for the latter research． References | Related Articles | Metrics

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Automobile AMT Electronic Throttle Fuzzy Control Based on Self-Tuning Function ZHANG Xiang，YANG Zhi-gang 2007, 26(5): 142-144.  Abstract ( )   PDF (187KB) ( )   The electronic throttle in the automobile AMT possesses the characteristics of being nonlinear，uncertain，etc．The electronic throttle is required to obtain accurate real-time control under different work circumstances and in different vehicles． Th e intelligent fuzzy control theory and control algorithm are presented based on self-tuning function and additional integral itern．Simulation verifies the algorithm's validity， References | Related Articles | Metrics

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Spatial-Temporal Variance Analysis of Urban Land-Use Intensity in Chongqing NIE Zun-xian，ZHOU Zhi-yue 2007, 26(5): 145-148.  Abstract ( )   PDF (312KB) ( )   With improved entropy method，the urban land-use intensities between 1997 and 2005 in Chongqing were analyzed on the basis of urban land-use intensity evaluating factor system．From the results of evaluation of urban land-use intensities of counties in Chongqing，the rules and driving factors for spatial-temporal variance of urban land-use intensity were concluded． Then some proposals for improving urban land-use intensity in the future are put f0rward． References | Related Articles | Metrics

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Theoretic Kernel and Planning Golden Rule of Urban Planning ZHANG Chun-xiao ，LONG Tian-yu ，ZHANG Zhi 2007, 26(5): 149-152.  Abstract ( )   PDF (364KB) ( )   The authors formulate the reflection on the aspect of the urban ecology and environment under city planning，and sum up that the theoretic kernel of urban planning is mostly the urban ecology and environment and the evaluating principle of systemic city planning．To the landscape city alongside mountainous region and waterscape，because of the particularity of its physical geography，the nmurul eco-geography and anthropogeography about lan dscape becomes the characteristic theoretic kernel of the landscape city planning．Finally，according to the frame of reference anent this characteristic theoretic kernel， the six special~atures with regard to the golden nile of the landscape city planning are point out． References | Related Articles | Metrics

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Empirical Research on Corporate Performance and Directorate Government Characteristics for Public Companies HONG Wei，CHENG Jian 2007, 26(5): 153-157.  Abstract ( )   PDF (328KB) ( )   Directorate government characteristics are very important for improving the corporate performance.Based on the four key indicators.an empirical research on the relationship between corporate performance and directorate govemment characteristics for Chinese Public company was conducted by the data from 2003 to 2005.The public companies need to establish reasonable scale of board of directors. References | Related Articles | Metrics

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G—FC—KKM Type Theorems in FC—Spaces WANG Tong 2007, 26(5): 158-160.  Abstract ( )   PDF (124KB) ( )   A new notion of finite continuous topological space(FC—space)without convexity structure was introduced in 2005． Many topological spaces with abstract convexity structure are all FC—spaces．G—FC—KKM(S-G—FC—KKM)type mappings ale in— troduced．By using the continuous partition of unity theorem，some G—FC—KKM(S-G—FC—KKM)type theorems ale proved in FC—spaces．These theorems generalize some results in recent literature． References | Related Articles | Metrics

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Permanence and Periodic Solution of a Model with Holling II Functional Response YU Pei 2007, 26(5): 161-163.  Abstract ( )   PDF (124KB) ( )   Through investigating a system of three species mixed model with HoUing Ⅱ type functional response，that the systern is perm anent under appropriate conditions is proved．Furtherm ore，if the model is a periodic system，there exist a unique positive periodic solution which is globally asymptotically stable under appropriate conditions． References | Related Articles | Metrics

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Necessary and Sufficient Condition of Strong Convergence of an Implicit Iteration Process for a Finite Family of Nonexpansive Mappings TANG Jing-tong 2007, 26(5): 164-166.  Abstract ( )   PDF (129KB) ( )   A new two—step interative alogorithms is put forward in a uniformly convex Banach space．The necessary and sufficient condition of strong convergence of the implicit iteration process for a finite family of nonexpansive mappings is proved． The results may extend and improve some recent corresponding results． References | Related Articles | Metrics