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Seismic Response of Piers in Deep Water Considering Hydrodynamic Pressure Zhang Jie,Zhu Dong-sheng,Zhang Yong-shui,Zeng Jin-ming 2012, 31(3): 357-361.  DOI: 10.3969/j.issn.1674－0696.2012.03.01 Abstract ( )   PDF (1474KB) ( )   The additional mass method of water was used to demonstrate the effect of hydrodynamic pressure on the bridge pier． With the help of ANSYS finite element software，a single pier model was established to analyze the seismic response of the bridge pier in deep water． The results show that the hydrodynamic pressure effect changes the seismic response characters of the pier and increases displacement of pier top and the internal force of pier bottom，and the hydrodynamic pressure role is also connected with structure itself and the cycle． Through actual analysis of continuous bridge and continuous rigidframe bridge，the hydrodynamic pressure function has been connected with structure of the innate cycle． Along with the increase of the innate cycle，the influence of the hydrodynamic pressure on the structure decreases． References | Related Articles | Metrics

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Equivalent Rigidity Analysis of Steel-Concrete Composite Beam with Shearing Slip Effect Li Wei-feng 2012, 31(3): 362-365.  DOI: 10.3969/j.issn.1674－0696.2012.03.02 Abstract ( )   PDF (849KB) ( )   The slip effect between steel and concrete in composite beam has an evident contribution to the deformation of the beam． An analytic method was proposed on the basis of elastic theory，considering shearing slip，to calculate the equivalent rigidity for composite beam with arbitrary cross-section． The results show the rules of equivalent rigidity changing from shearing slip and rigidity effects; and the difference value of the rigidity and reduced rigidity when the stud spacing is huge． The composite beam deflection caculated by this method has a good agreement with those obtained from experiment． References | Related Articles | Metrics

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Simplified Method of Beam Bridge Calculation Model Based on Grillage Theory Tan Shang-yu,Liang Yue-hua,Tao Qing-dong,Xiao Sheng-xie 2012, 31(3): 366-368.  DOI: 10.3969/j.issn.1674－0696.2012.03.03 Abstract ( )   PDF (1794KB) ( )   Based on the principles of grillage model，the boundary conditions and the advantages and weaknesses of grillage method compared with the shell or solid element analysis were summarized． The points to simplify grillage model were illustrated from grillage meshing and sectional characteristic，and the effectiveness and applicability were verified after comparing the analysis of a bridge example with the results of load test． References | Related Articles | Metrics

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Nonlinear Aerostatics Analysis of Long-Span Cable-Stayed Bridge Yang Shang-qing,Jiang Yu-chuan,Zeng Zhong 2012, 31(3): 369-372.  DOI: 10.3969/j.issn.1674－0696.2012.03.04 Abstract ( )   PDF (1906KB) ( )   On the basis of linear theory of the static wind stability，a method which was used to solve wind-induced lateral torsional buckling problem for long-span cable-stayed bridges was proposed． Nonlinear influences caused by structure and aerostatic load were included in this method，which can aviod overestimating of static wind resistance． The ANSYS /APDL programming language was used to analyze static wind stability of a long span cable-stayed bridge and show the nonlinear influence on aerostatic stability in wind speed increasing process． References | Related Articles | Metrics

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Reinforcement Effect Evaluation of Arch Bridge Based on Co-Section Analysis Method Huang Can,Liu Si-meng,Zhou Jian-ting,Zhou Lei,Wu Heng 2012, 31(3): 373-376.  DOI: 10.3969/j.issn.1674－0696.2012.03.05 Abstract ( )   PDF (977KB) ( )   On the basis of secondary stress characteristics of arch bridge，the arch ring of internal force distribution of composite section after reinforcement was analyzed． The load exchange rate and utilization of reinforcement layer respectively were used to analyze the original arch ring and the reinforcement of arch ring in order to complete strengthening effect assessment． Based on the actual engineering，finite element analysis was confirmed by section analysis evaluation method of arch bridge to be rational and intuitive． It has the certain reference value for the same type of bridge reinforcement effect evaluation． References | Related Articles | Metrics

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Randoms Analysis of Bridge Impact Coefficient Shi Shang-wei,Du Song,Li Ying-xue 2012, 31(3): 377-379.  DOI: 10.3969/j.issn.1674－0696.2012.03.06 Abstract ( )   PDF (1453KB) ( )   The influence factors of vehicles impact on the bridges include the vehicle-bridge frequency coupling，the bridge deck unevenness，the randomness of the driving test and size of dynamic loading efficiency． Based on a dynamic test upon a typica three span continuous box girder bridge，through the dynamic deflection schedule signal under the action of road test， the randomness of bridge impact coefficient，the correlation between impact coefficient and dynamic loading efficiency were analyzed． Studies have shown that the impact coefficient is quite random; the impact coefficient has close relation with dynamic loading efficiency． References | Related Articles | Metrics

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Numerical Analysis of Surrounding Rock Pressure on Shallow Buried Tunnel Xiang Yu-zhou,Wang Cheng,Zheng Ying-ren,Wu Sheng-fan 2012, 31(3): 380-384.  DOI: 10.3969/j.issn.1674－0696.2012.03.07 Abstract ( )   PDF (1112KB) ( )   Based on the limiting equilibrium theory and elastic-plastic theory，surrounding rock pressure on shallow buried tunnel was calculated by the numerical analysis software ANSYS and FLAC3D． The soil strength parameters should be reduced before calculation，then nodal force was applied in the opposite direction of the gravity on the vault after excavation of tunnel with no-lining; then the nodal force was adjusted to get the limit state of the tunnel destruction，that was，the limit equilibrium． In the calculation，the convergence reflected whether the tunnel was destroyed． The method not only takes into account the speciality of soil material，but also has strict mechanics basis． The calculating result is more coincident with the reality，and this method offers a new way to calculate the surrounding rock pressure on shallow buried tunnel． References | Related Articles | Metrics

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Emergency Evacuation Simulation Model of Chongqing's Light Rail Station Yu Pei 2012, 31(3): 385-388.  DOI: 10.3969/j.issn.1674－0696.2012.03.08 Abstract ( )   PDF (1469KB) ( )   Personnel evacuation problem is a hot spot in security field research． In-depth systematically research for emergency evacuation，especially by modern simulation technology to achieve personnel evacuation operations，has great significance to improve the scientific decision-making of urban rail traffic safety． References | Related Articles | Metrics

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Numerical Analysis of Intersection of Long-Span Subway Station Wang Xian-yi,Peng Bo,Wu Wen-zhong 2012, 31(3): 389-393.  DOI: 10.3969/j.issn.1674－0696.2012.03.09 Abstract ( )   PDF (1276KB) ( )   The constructing station of Gaoyikou，which is a part of matching traffic engineering for Western International Convention and Exhibition Centre in Chongqing，was took as the object of study． The finite element software-ANSYS was used to simulate the cross site between the long-span subway station and the inward and outward channels． At the circunstances of entrances and no entrances，the mechanical behavior of the rock and initial support near the station intersection were compared． At the same time，the displacement of surrounding rock in the tunnel construction process was monitored， the variation of the surrounding rock displacement over time was analyzed，and the reliability of numerical analysis was verified． The result shows that the excavation of import and export has a significant impact on the displacement and stress of rock within rigion of intersection，especially，the displacement of the vault and bottom，and the stress in the vault，haunch and bottom changes significantly． References | Related Articles | Metrics

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Study on Microtexture Structure of Asphalt Pavement Coarse Aggregate Liu Tao,Li Zhi,Sun Yang-yong,Zhong Ru-biao 2012, 31(3): 394-397.  DOI: 10.3969/j.issn.1674－0696.2012.03.10 Abstract ( )   PDF (1213KB) ( )   The five different stone materials were chose to measure their microscopic texture curve with self-developed laser texture meter．By the fractal dimension of the box theory counting method，MATLAB programming was used to calculate different coarse aggregate fractal dimension quickly． The results show that the evaluation method can accurately evaluate the micro-texture of coarse aggregate，and provide more extensive selection of tools and scientific basis for selecting the sliding surface layer． References | Related Articles | Metrics

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Influence of Specimen Thickness on Shear Performance of Asphalt Mixture in Uniaxial Penetration Test Chen Hao,Fan Tong-jiang,Fan Fang-fang 2012, 31(3): 398-401.  DOI: 10.3969/j.issn.1674－0696.2012.03.11 Abstract ( )   PDF (292KB) ( )   Different thickness core samples drilled from the wheel tracking plate for AC-13 ，AC-16 and AC-20 asphalt mix- tures were experimented by using Uniaxial Penetration Test Methods in which diameter 28． 5mm head was used in order to study the effect of the different height core samples on shear strength properties of asphalt mixtures． The results showed that when the specimen height for AC-13 ，AC-16 and AC-20 were equal to or greater than 5cm，6cm and 7cm，the shear stress and shear strain were closed to a constant，and no longer subjected to the change of the specimens height． Therefore，the thickness of specimen，which matched the structure layer thickness with nominal maximum aggregate size obtained by wheel tracking test，was reasonable to be adopted in uniaxial penetration test References | Related Articles | Metrics

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Finite Element Analysis of Reinforced Embankment Based on PLAXIS Yang Wei,Wang Chang-xian 2012, 31(3): 402-405.  DOI: 10.3969/j.issn.1674－0696.2012.03.12 Abstract ( )   PDF (1596KB) ( )   Based on the finite element software PLAXIS，the effect and mechanism of reinforced embankment were analzed． The effect of geogrid axial stiffness and the reinforcement spacing on the internal force distribution，horizontal displacement of slope toe and the vertical displacement in the center foundation were discussed． The results indicate that the lateral displacement can be controlled by the geogrid effectively． The geogrid has a homogenization on the foundation settlement and can control the ground upheaval ，so as to improve the stability of the subgrade.In order to improve the reinforced effect effectively， the geogrid should be placed in small space and has a large stiffness． References | Related Articles | Metrics

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Culvert Model Design and Analysis Based on Centrifugal Model Test Qi Yong-zheng,Liu Xiang-dong,Lv Jia,Lu Li-na 2012, 31(3): 406-410.  DOI: 10.3969/j.issn.1674－0696.2012.03.13 Abstract ( )   PDF (1288KB) ( )   Two culvert centrifuge model tests were accomplished for low embankment on soft foundation.The process of culvert model making and lots of problems were introduced concretely.Culvert models were designed with the necessary simplified means and alternative materials.The composite modulus conversion method was used in model pile design. At the same time，the conversion methods related with road surface and traffic load were considered. The results show that，for low embankment on soft foundation sections，the cement mixing pile composite foundation in culvert can reduce the absolute settlement， but the road surface longitudinal differential settlement increased. For reducing vehicle jump phenomenon and increasing traffic comfort，the culvert design of low embankment on soft foundation should control the uneven settlement primarily and the absolute settlement secondarily． References | Related Articles | Metrics

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Peak Particle Vibration Velocity of Collapse under Excitation Effect Wang Zhi,Tang Hong-mei 2012, 31(3): 411-415.  DOI: 10.3969/j.issn.1674－0696.2012.03.14 Abstract ( )   PDF (1659KB) ( )   The failure mechanism of massive perilous rock needs to consider the interaction among perilous rock masses. The excitation effect of collapse has an important meaning to adjacent perilous rock masses． The vibrating signal of collapse experiment was integral transformed．Meanwhile，for the falling perilous rock,a physical model for the excitation effect of collapse was established and a calculating method for the particle vibration velocity spread equably from the inner vibration source to outside under the excitation effect of collapse was constructed according to the conservation of energy． Through the example analysis，it is basically consistent with the experimental conclusion,and the production provides some scientific basis for the further research on the failure and evolvement mechanism of perilous rock． References | Related Articles | Metrics

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Design and Application of Mini-Roundabouts on Rural Road Zhao Guanghui,Li Feng,Liu Tangzhi,Mo Zhifan 2012, 31(3): 416-420.  DOI: 10.3969/j.issn.1674－0696.2012.03.15 Abstract ( )   PDF (1454KB) ( )   In allusion to rural road intersection become accident-prone point，the mini-roundabouts，which were widely used abroad to improve rural road traffic safety were introduced，and the mini-roundabout form for rural road and the design method， which have certain guidance meaning to improve the rural road traffic safety，were put forward． References | Related Articles | Metrics

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Research on Validity Evaluation Indices of Safety Facilities in Rural Highways Mi Xiao-yi,Zhai Ning-qun,Wu Jing-mei,Li Jin-hai 2012, 31(3): 421-424.  DOI: 10.3969/j.issn.1674－0696.2012.03.16 Abstract ( )   PDF (1432KB) ( )   In order to evaluate the validity of safety facilities in rural highways，five indices including speed，driving trajectory， physiology，traffic accidents and Satisfaction were proposed and the applicabilities were analyzed． Using field investigation datum，two analysis examples were given to illustrate the application of speed index and driving trajectory index． The results show that speed index and driving trajectory index can be used to evaluate the validity of some micro-level safety facilities in rural highways in a short time． Physiology index，traffic accidents index and satisfaction index can be used to evaluate the validity of safety facilities from macroscopic and microcosmic levels，but there are some limitations in application． References | Related Articles | Metrics

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Critical Techniques and Strategies for US Workzone Transportation Management Wang Zhong-ren 2012, 31(3): 425-431.  DOI: 10.3969/j.issn.1674－0696.2012.03.17 Abstract ( )   PDF (1827KB) ( )   Transportation management plan (TMP) during construction is essential for successful project delivery． A general perspective of workzone (lane closure) transportation management plan in the United States was presented，starting with an introduction of the fundamental traffic analysis techniques used in lane closure management． The five critical strategies for transportation management during construction were described． These strategies include public information，traveler’s information， incident management，construction strategies，and demand management． In the end，the lessons learned on workzone transportation management were presented，which will provide beneficial references for similar practices in China． References | Related Articles | Metrics

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Application of Gray Weighted Incidence Analysis in Highway Network Evaluation Zeng Kun,Zeng Sheng 2012, 31(3): 432-434.  DOI: 10.3969/j.issn.1674－0696.2012.03.18 Abstract ( )   PDF (1425KB) ( )   Aiming at the evaluation of highway network problems，the gray weighted incidence analysis method was proposed． This method determined the weighting coefficients by maximizing deviations and using the same index optimal value as the ideal plan.Evaluation plan was ordered according to its weighted incidence degree to ideal plan． The method has been applied to evaluate highway network.The result shows that the evaluation result is more objective and just． References | Related Articles | Metrics

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Study on Reader Anti-Collision Algorithm in RFID System Li Xue,Lu Bai-chuan ,Li Zheng 2012, 31(3): 435-438.  DOI: 10.3969/j.issn.1674－0696.2012.03.19 Abstract ( )   PDF (1545KB) ( )   To solve the problem of multireaders’collision，an optimization algorithm of neural network based on Probabilistic Power Control was proposed． In the algorithm each reader’s transmitter power changed with the dynamic distribution of β， then the sensors were adopted to determine the similarity of readers’power on the basis of the Probabilistic Power Control， which can enable the readers work under best conditions． The experimental results show that the interference between multiple readers greatly reduced，and the distance between their identification labels can get the desired value． References | Related Articles | Metrics

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Image Enhancement Method of Vehicle Plate Based on Canny Edge Detection Zhang Si-jun,Wang Le-le,Lu Zhen-yu 2012, 31(3): 439-442.  DOI: 10.3969/j.issn.1674－0696.2012.03.20 Abstract ( )   PDF (1537KB) ( )   Based on Canny operator，a method of plate edge detection was proposed.It was suitable for different occasions as its parameters can be adjusted to recognize different edge features,and particularly suitable for images with the feature of closed such as license plate numbers.However,the speed was slow in real-time image processing． References | Related Articles | Metrics

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Application of a New Data Model Based on Carriageway Network Guo Peng,,Sun Yan-ling,Cui Tiejun,Ma Shou-feng,Chen Xiao-ling 2012, 31(3): 443-447.  DOI: 10.3969/j.issn.1674－0696.2012.03.21 Abstract ( )   PDF (1929KB) ( )   According to the requirements of transportation management,a new carriageway-based road network data model by selecting carriageway as minimum modeling unit was built. In the model，geometry network and logical network were used to separate geometry features and connectivity relationships of road network; two-level network structures were built to satisfy the multi-scale representation of road network. Finally,a spatial-temporal data management method for mobile objects was introduced based on the above data model and an example was presented to verify the presented model． References | Related Articles | Metrics

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Grey Evaluation of Transport Hub in Economic Cycle Based on Rough Set Theory Zhang Bing,Deng Wei 2012, 31(3): 448-454.  DOI: 10.3969/j.issn.1674－0696.2012.03.22 Abstract ( )   PDF (1782KB) ( )   Transport hub comprehensive evaluation in the economic cycle has the problems of the information uncertainty and too many evaluation indicators． The traditional evaluation methods are simple and direct but can be easily interfered of many subjective factors. So the method of grey analysis comprehensive evaluation based on rough sets was put forward． This evaluation method combined the indicators weight based on rough set theory and the grey comprehensive evaluation method，and got the objective weight of indicators from filtering the original indicators and standardizing the importance degree of indicators． Then，comprehensive evaluation model and corresponding arithmetic were summed up.Finally,the sample illuminated the validity and feasibility of this comprehensive evaluation method． References | Related Articles | Metrics

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Study on Waiting Service Level at Bus Stop Based on Fuzzy Evaluation Zhu Rui,Li Lin-bo,Wu Bing 2012, 31(3): 455-460.  DOI: 10.3969/j.issn.1674－0696.2012.03.23 Abstract ( )   PDF (1790KB) ( )   Based on Fuzzy Synthetic Evaluation，SP survey was used to calibrate the waiting service level at bus stop model． The relationship of the target，the factors and the elements was established，the factors affecting the level of service of waiting service were combined，and the evaluation criteria of waiting service at the bus stop was established． The waiting service level of public transportation used by respondents was took as an example to show the application of the model and the weakness of the bus stops were proposed based on application result． References | Related Articles | Metrics

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Estimation Methods of Bus Sub-periods Emission Rate Based on Test Data Lin Yi-qing,Zhong Zhi-hong,Peng Mei-chun,Liang Xiao-feng 2012, 31(3): 461-464.  DOI: 10.3969/j.issn.1674－0696.2012.03.24 Abstract ( )   PDF (1645KB) ( )   The operating data of buses generated by traffic management system and the data obtained by emission tests were used． With speed range as data fusion channel，the data were joined together by data fusion method． The emission rate( g / s) of HC，CO and NOx emissions of sub-periods and toltal emission of a day were calculated． The principle of the data fusion and the related issues such as fusion channel selection，applicability，representative were discussed． Combined with vehicle flow data，the method presented can be further used to estimate temporal and spatial distribution of motor vehicle emissions． References | Related Articles | Metrics

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Research on Aerodynamic Characteristics During Speeding and Overtaking Processes in Tunnel Gao Long,Zhou Haichao 2012, 31(3): 465-468.  DOI: 10.3969/j.issn.1674－0696.2012.03.25 Abstract ( )   PDF (1890KB) ( )   By virtual of advanced CFD dynamic mesh technology，the 2-D transient simulation of vehicle’s speeding process and overtaking process were realized，and the vehicles’s aerodynamic characteristics were obtained． A comparison of aerodynamic characteristics between the road tunnel and non-tunnel road was presented． The results show that the flow field and pressure field change greatly; the aerodynamic effect is larger than in non-tunnel condition; the safety performance of the vehicles is reduced during the process of speeding and overtaking in tunnel． References | Related Articles | Metrics

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Application on Fuzzy Neural Network Expert System in Fault Diagnosis Wang Lijun 2012, 31(3): 469-472.  DOI: 10.3969/j.issn.1674－0696.2012.03.26 Abstract ( )   PDF (1891KB) ( )   According to the fuzziness and complexity of variety of vehicle electric control engine malfunctions，Fuzzy-neural network-expert system，combined the characters of fuzzy logic，neural network and expert system，was set up to complete electric control engine fault diagnosis.Visual Basic 6.0，MATLAB 7.0 and Access database were adopted to design system frame，analysis and research all system flow.Research turns out this diagnosis system diagnose fault of electric-control engine fast and accurately． References | Related Articles | Metrics

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Problems and Countermeasures of CKZ6991EB Bus Powertrain Liu Jianxun,Yu Song 2012, 31(3): 473-476.  DOI: 10.3969/j.issn.1674－0696.2012.03.27 Abstract ( )   PDF (1683KB) ( )   Powertrain system of CKZ6991EB type of CNG bus of Chongqing does not match the actual operating conditions and its operating efficiency is low. The driving axle ratio，which used genetic algorithm based on MATLAB while maintaining the original vehicle transmission assembly on the basis of the same，was optimized.The results show that the driving axle ratio of 7.51 can significantly improve the operating efficiency of passenger cars，and economy will be improved when bus running in high-density areas ramp． References | Related Articles | Metrics

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Research on Engaging Control of AMT Clutch for Starting Process Xia Changgao,Zhang Meng,Wang Jilei,Zhang Zhenyu 2012, 31(3): 477-481.  DOI: 10.3969/j.issn.1674－0696.2012.03.28 Abstract ( )   PDF (2037KB) ( )   The clutch engaging process was analyzed in detail and the main factors which influenced the engaging performance were found out，and the optimal engagement law was established from the the automobile’s service requirements． On this basis， the fuzzy control strategy which was used for synthetic control of all stages of clutch engaging process was formulated，the inputs of control system were throttle opening，the speed difference between the clutch active disc and the clutch slave disc and the displacement of clutch; the output was the engaging speed． The simulation model of the control of clutch during vehicle starting was established by MATLAB/SIMULINK.The simulation results show that the control strategy could meets the requirements of vehicle． References | Related Articles | Metrics

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Fuzzy Control of Semi-active Suspension with Variable Stiffness and Damping Fan Fangqiang,Pan Gongyu 2012, 31(3): 482-485.  DOI: 10.3969/j.issn.1674－0696.2012.03.29 Abstract ( )   PDF (1849KB) ( )   On the purpose of improving ride comfort，a new four degree-of-freedom semi-active suspension with variable stiffness and damping was established． And a common fuzzy control system and a variable universe fuzzy control system were designed according to the fuzzy control theory． The passive suspension model and the semi-active suspension models with two different fuzzy control systems were built and simulated with random road input of integral white noise in MATLAB/SIMULINK． The results of the simulation show that，the vehicle’s vertical acceleration and pitch angular acceleration of the semiactive suspension with variable stiffness and damping are much smaller than the accelerations of passive suspension，and the ride comfort is effectively improved.The results also show that the variable universe fuzzy controller is better than the common fuzzy controller on decreasing vibration． References | Related Articles | Metrics

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Stress Optimization of FEA Truck Cab Floor Based on Switching Mechanism Zhang Aijun,Tan Jijin,Liang Huiren,Xu Yinsheng,Zhang Yi 2012, 31(3): 486-488.  DOI: 10.3969/j.issn.1674－0696.2012.03.30 Abstract ( )   PDF (1844KB) ( )   For solving the problem of crack on a light truck cab floor，road test and cab switch test had done for the track． As a result，the main factor which brought about its crack was found.The finite element model of the cab was built． The prestress of cab was obtained from the switching mechanism analysis.The structure strengths of the cab at different operation cases were analyzed and compared，and a reliable result was gained.Based on the results obtained in this work，some corresponding improving schemes were recommended． References | Related Articles | Metrics

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Dynamic Performance of EFI Engine Using Substitute Fuels Li Xinguang,Han Bingyuan,Wang Xinyu 2012, 31(3): 489-492.  DOI: 10.3969/j.issn.1674－0696.2012.03.31 Abstract ( )   PDF (1733KB) ( )   Dynamic performance of EFI engine experiments were carried out by using 93gasoline、M15、M30、E10、E20 and LPG under full load speed． The results showed that the unchanged engine that used Ethanol fuel ( E10、E20) retained its high dynamics performance compared to the 93#gasoline，however，the engine used M15 and M30 was lower than the E10 and E20． The engine used LPG was the lowest than the other fuels when the engine was changed to the dual fuels system． References | Related Articles | Metrics

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Practical Stability of Submarine Motion under Sloshing Impacts Xiong Xianwei,Wei Zhuobin,Xiang Chengan 2012, 31(3): 493-496.  DOI: 10.3969/j.issn.1674－0696.2012.03.32 Abstract ( )   PDF (1789KB) ( )   The tank sloshing can have an enormous impact on the ship and may cause the instability of ship motion． The practical stability of the submarine motion under the sloshing impact was studied． Numerical simulations of sloshing in the submarine tank were performed using the commercial computational fluid dynamics code． The coupling effects of tank sloshing and submarine motion were analyzed based on the results of the simulations，and the model of the submarine roll motion under sloshing impact was constructed． The practical stability of a typical submarine roll motion system was analyzed based on a numerical simulation.Therefore，the feasibility of the approach was verified． References | Related Articles | Metrics

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Application of Ultrasonic Flow Meter in Detecting and Locating Ship Pipeline Leakage Han Xuefeng,Zhang Jie,Peng Zhongbo 2012, 31(3): 497-500.  DOI: 10.3969/j.issn.1674－0696.2012.03.33 Abstract ( )   PDF (1781KB) ( )   Ship pipeline leakage can be detected and located by utilizing ultrasonic flow meter based on negative pressure waves and flow equilibrium method． An experiment platform was created on the basis of the operating principle and application characteristics of ultrasonic flow meter，the utilization of negative pressure waves in ship pipeline leakage and location system． Then the application of ultrasonic was verified，moreover，it showed that small leakage can be more easily detected and the frequency of false alarms during the normal operating of the pump valve can also be effectively decreased if ultrasonic flow meter based on negative pressure waves and flow equilibrium method was utilized in ship pipeline leakage detection and location， thus the practical applicability and feasibility of this method were demonstrated． References | Related Articles | Metrics

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Discussion on Similarity of Abnormal Ship Model in Hydraulic Model Cai Ruzhe,Li Cheng,Lu Zheng 2012, 31(3): 501-505.  DOI: 10.3969/j.issn.1674－0696.2012.03.34 Abstract ( )   PDF (1796KB) ( )   For the abnormal ship model application in the abnormal hydraulic model experiment，it’s necessary to analysis the abnormal ship model state of motion theoretically.The abnormal ship model，should meet certain regularities under the water as normal ship model，including geometric similarity，kinematic similarity and dynamic similarity and maneuverability similarity． The similar regulation of abnormal ship model under hydraulic model was discussed on the basis of the similar regulation of hydraulic model． References | Related Articles | Metrics

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Effect Factors of Newbuilding Price Based on Double-log-linear Regression Model Zhu Mo,Zhang Qiang 2012, 31(3): 506-511.  DOI: 10.3969/j.issn.1674－0696.2012.03.35 Abstract ( )   PDF (1743KB) ( )   Newbuilding price is a very important factor considered by investors in shipping market． There are many factors influencing the newbuilding price． Some of them just can be qualitatively analyzed，but several key factors can be quantitatively analyzed.In order to find the key factors affecting newbuilding price，double-log-linear regression model was established to analyze the influencing degree of each factor based on the relationship between price and influencing factors． It is found that，for Capesize bulk carrier，the ship building cost affects newbuilding price most significantly，next is the secondhand ship price and ratio of orderbook and fleet． References | Related Articles | Metrics

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Relationship Between Sediment Size and Heavy Mental Pollutions in Yangtze River and Jialing River of Chongqing Urban City Chen Jing,Wang Pingyi,Yang Yanmei,Zhang Xiufang 2012, 31(3): 512-516.  DOI: 10.3969/j.issn.1674－0696.2012.03.36 Abstract ( )   PDF (1865KB) ( )   Relationships between sediment and heavy metal pollutions of eight cross sections(Lijiatuo，Egongyan，Huangshaxi， Shanhuba，Dafosi(Cuntan) ，Huanghuayuan，Hualongqiao，Ciqikou) in Chongqing urban section were investigated and analyzed.The results show that the relationship between particle size and pollution content is not apparent when the particle size is above 0.08 mm; when the particle size is less than 0.08 mm，the contaminant contents increase with particle size of sediment decreasing apparently． References | Related Articles | Metrics

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Chamfering Stability Study on Waterway Regulation Project Tan Kun,Yang Xiangfei,Sun Zhentao,Hai Tao,Zhang Junfeng 2012, 31(3): 517-520.  DOI: 10.3969/j.issn.1674－0696.2012.03.37 Abstract ( )   PDF (1807KB) ( )   Dredging and chamfering are important measures for waterway regulation． Different forms of chamfering section have different characteristics of water-sediment movement，which can influence the chamfering stability． Through generalized model test and theoretical analysis，the influence on sedimental bed load movement，the chamfering plane layout and the chamfering stability caused by chamfering flow characteristics and different chamfering sections were studied． The results show that narrow deep type section is better for stability of dredging and chamering; BOD B/H should be between 17.8 ～ 21.5 while flow speed( 1.1 ～ 1.3) Vc ． References | Related Articles | Metrics

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Simulation Analysis of Block Length Influence on Container Terminal Handling Efficiency Wang Xiaobian,Han Xiaolong 2012, 31(3): 521-524.  DOI: 10.3969/j.issn.1674－0696.2012.03.38 Abstract ( )   PDF (1830KB) ( )   Reasonable yard layout can improve the operating efficiency of terminal mechanical，reduce shipping waiting time and the cost of terminal operation，and improve the comprehensive competitiveness of container terminal． Based on analysis of the terminal operation process，the FlexsimCT software was adopted to establish simulation model． The influence of different kinds of block length on the operating efficiency of terminal mechanical was discussed; the appropriate resources allocation ratio of quays，gantry cranes，and trucks under the different block length and the best block length under the maximum efficiency of quay crane were worked out.These conclusions can provide significant guidance for the actual operation of container port in future． References | Related Articles | Metrics

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Leakage Volume Estimation in Rural Water Pipe Network Based on GIS Qiang Yue,,Zhao Mingjie,Lin Junzhi,Zhao Xiaolian 2012, 31(3): 525-527.  DOI: 10.3969/j.issn.1674－0696.2012.03.39 Abstract ( )   PDF (1772KB) ( )   The type of leakage network in water pipe network was introdued． The leakage volume model and estimation methods of pipe network node were analyzed． A new leakage volume estimation method was established based on the tool of GIS network． The study focused on pipeline networks topology relation． The amount of pipe network node leakage volume was estimated by using DEM to caculate network nodes elevation and the leakage model method.It was proved that it was an efficient way to estimate the amount of leakage based on GIS pipeline network nodes by example． References | Related Articles | Metrics

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Evaluation on Environment Friendliness of Poplar Powder-based Composites Made by Warm Self-bonding Compaction Wu Qingding,Liang Sheng,Yi Lin 2012, 31(3): 528-534.  DOI: 10.3969/j.issn.1674－0696.2012.03.40 Abstract ( )   PDF (2887KB) ( )   Based on the TD-GC/MS online technique，the volatiles total ion current chromatogram of poplar powder composites which were formed by warm self-bonding compaction were analyzed at 40 ℃，60 ℃，90 ℃ and 160 ℃． The peak area normalization method was used to identify the retention time and peak area of poplar powder-based composites at each temperature， then the environment friendliness of poplar powder-based composites was evaluated． The results show that in the volatiles of poplar powder-based composites，the beneficial component content is significant higher than that of harmful component at each temperature． The beneficial components are 6 times higher than harmful components at 40 ℃，60 ℃ and 90 ℃，and the corresponding value at 160 ℃ is 29 times，so the environment friendliness is good． The total volatiles kinds， beneficial components kinds and harmful components kinds of poplar powder-based composite are approximately quite to that of poplar raw powder，but the beneficial component content increases evidently and the harmful component content decreases significantly． It shows that not only the warm self-bonding compaction process of poplar powder-based composites have environment friendliness，but also the preparation and application processes are environment friendly． References | Related Articles | Metrics

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Design of Mobile Terminal Positioning System Based on CORS Linghu Jin,Zhang Yuan,Jiang Hao 2012, 31(3): 535-538.  DOI: 10.3969/j.issn.1674－0696.2012.03.41 Abstract ( )   PDF (1820KB) ( )   The necessity and feasibility about the establishment of mobile terminal positioning system were analyzed to put forward a method of improving the accuracy of the mobile terminal positioning． The basic content and system framework about the mobile terminal positioning system basing on the CORS were elaborated． Through the mobile phone solution and a server solution two kinds of mode were realized． References | Related Articles | Metrics