bluuebunny/crossref_metadata_2025 huggingface dataset:
Absolute Roughness of Trunk Natural Gas Transmission Pipeline with Mechanics Properties and Material Properties
Authors: Zhou Ying , Liu Yu Feng , Chen Feng , Li Jiang , Cheng Jiang , Yang Han Qing , Yang Ying
Published: December 2012

The absolute roughness of pipeline is of great importance on the process calculation of trunk gas transmission pipelines. The software package Pipeline Studio is used to build the West-to-East Gas Pipeline, the Second West-to-East Gas Pipeline, Shan-Jing Gas Pipeline and the Second Shan-Jing Gas Pipeline simulation models, and the pipe segment between the valve chambers is the minimum element. The pipeline absolute roughnesses are inverse calculated with using the simulation models and 38 groups of realistic operation parameters. The results show there is no significant association between the absolute roughness and seasons as well as flow rate. The absolute roughness of the trunk Gas Pipeline is about 0.240mm within one year after commissioning, and the absolute roughness of the trunk gas pipeline will be gradually reduced with the growth of the running time, and the roughness will maintain about 0.009-0.014mm after 3 years from commissioning.
Dynamic Analysis of Steelwork of the Small Capacity and Economic Mechanical Parking System
Authors: Li Hai Ying , Wu Hua Liang , Chen Xiao Hong , Xie Sheng Jian
Published: December 2012

By using finite element software, the paper establishes the steelwork analysis model of the small capacity and economic mechanical parking system and provides the modal analysis of steelwork in both cases of no-load and full load. In this paper, it provides a theoretical basis for the design of mechanical parking system steelwork.
Structural Optimization of Packer’ Cone with Material Properties and Mechanics Parameters Based on ANSYS
Authors: Guo Zhi Ping , Guo Wei , Wang Yan Fei , Li Guan Fu , Lu Yan Zheng
Published: December 2012

Cone is one part of a packer. To understand the seal effectiveness of the packer, mechanical analysis must be made for it. The finite element model of packer is set up and packer minimum setting load changes are calculated under different climb angle of cone. Results show that reduce the cone angle of climb can make the packer sealing load significantly lower.The calculation results provide the theoretical basis for the real operation.
Enhanced the Dielectric and Tunable Properties of BZNT Thin Films through Adjusting Annealing Process
Authors: Sun Xiao Hua , Hou Shuang , Luo Zhi Meng , Huang Cai Hua , Hu Zong Zhi
Published: December 2012

Bismuth zinc niobate titanium (Bi1.5Zn0.5 Nb0.5Ti1.5O7) (BZNT) thin films were deposited on PtTiSiO2Si substrates by radio frequency (rf) magnetron sputtering. The microstructure, surface morphology, stress, dielectric and tunable properties of thin films were investigated as a function of initial annealing temperature. It’s found that high initial annealing temperature increases the grain size, dielectric constant and tunability of BZNT films simultaneously and decreases the tensile stress in films. The BZNT thin film annealed from 500 °C to 700 °C shows the highest FOM value of 45.67 with the smallest dielectric loss and upper tunability.
Investigation on some Properties of RenshapeTM SL7545 Type Photosensitive Resin and its Application for Stereolithography Material
Authors: Huang Bi Wu , Cheng Gui Liang , Deng Chong , Zou Huai Hua
Published: December 2012

In the paper, RenshapeTM SL7545 type photosensitive resin for stereolithography material was characterized by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy, showing the presence of epoxy and acrylic functional groups, as well as aromatics and aliphatic ether groups. The experimental results showed that its viscosity at 30°C was 350mPa.s, its critical exposure (Ec) was 10.4mJ/cm2, its penetration depth (Dp) was 0.17mm, the tensile strength of its cured product was 41.5MPa, the tensile modulus was 1561MPa, the elongation at break was 14.7%. With the photosensitive resin as the processing material, the part of an active pincers was fabricated using the Stereolithography Apparatus (HRPL-I), and the quality of the fabricated part was good.
A Prototype of Electrostatic Membrane Reflector with Composite Properties of Membrane Material
Authors: Shi Guang Feng , Zhang Peng
Published: December 2012

Membrane reflector is light enough and deployable for launching into the space for large aperture telescope. Processes of design, computation, analysis, assembly, control, and measurement of a prototype of electrostatic polyimide reflector are introduced in this paper. And, a numerical control algorithm and a measurement algorithm based on the phase-shift and incoherent imaging method are developed for this prototype. The measurement results are analyzed and the trial experience is concluded, which is very helpful for further research work in membrane reflector in the future in China.
Density Functional Theory Study of P-Type Transparent Conducting 2H-CuAlO2 Oxide
Authors: Liu Wen Ting , Luo Yuan Yuan , Liu Zheng Tang , Wei Zhi Min
Published: December 2012

CuAlO2is an important p-type transparent conductive oxide (TCO) material. Thus, in this paper, the structure and properties of 2H-CuAlO2are calculated using the plane-wave ultrasoft pseudopotential technique based on the first-principles density functional theory. The calculated equilibrium lattice parameters is in good agreement with experimental and reported values. The energy band gap of 2H-CuAlO2has been calculated and the results shows that 2H-CuAlO2has an indirect band gap. The density of state for 2H-CuAlO2has also been calculated.
Study on Corrosion Behavior of the 304 Stainless Steel in the Heavy Oil with High Salt, High Sulfur and High Acid Value
Authors: Wang Xiao Hong , Wei Yu , Shao Chun Yun , Shi Yi Jun , Xue Wei , Zhu Jian Feng
Published: December 2012

The uniform corrosion and localized corrosion of 304 stainless steel in heavy oil with high salt, high sulfur and high acid value were researched by weight loss method and electrochemical method. The corrosion morphology of samples with and without corrosion product films and the compositions of the corrosion product films were observed using SEM and EDS. The results show that the 304 stainless steel is inapplicable to the refinery equipment of this heavy oil because of the severe local corrosion even if the uniform corrosion rate is as low as 0.0107mm/a. The salt corrosion and sulfur corrosion occur on the local surface of 304 stainless steel because of the chloride ion formed by hydrolysis of salt in the small emulsifying water. The water soluble iron naphthenate produced by chemical reaction between naphthenic and ferrous sulfides impel the local corrosion of the 304 stainless steel.
Analysis of China's Iron and Steel Industry Development of Circular Manufacturing for Environment
Authors: Cui Xiao Jie , Zhao Ding Guo , Zhao Yan Xia , Lei Zhen Hai
Published: December 2012

The environment is a human living space. The harmonious development of the human with the natural environment is the basis for sustainable development. With the improvement of society development and human creativity, environmental pollution and ecological destruction has exacerbated the environmental carrying capacity continued to decline. Accompanied to industrialization and urbanization and society growth, ecological environment continues to worsen. Human existence was under the challenge from the natural world. The obvious contradiction was between society development and environmental protection. Environmental issues were restraining the further development of the global economy.
Study on the Features of Production Decline Law in Oil Manufacturing System in Wangyao Block
Authors: Yan Qing Hui , Xiao Han Min , Sun Ling Hui , Liu Wei Dong , Hu Jun Cheng
Published: December 2012

Features of production decling determines the deployment of development project in oilfield, which has heavy influence on the oil manufacturing system. Eq.(17)and (18) have shown the final results. The characteristics of oil and water percolation, presented by Figure.1, are the primary factors for decline law. Oil-water relative permeability equations of WangYao Block, in AnSai oilfield, was deducted, and the oil-water relative permeability curves were drawn according to the equations. The oil phase curve presents a change from a linear relationship to an exponential relationship with the increase of the water saturation, which means an exponential decrease and a harmonic decrease of the single well production.
The Necessary Condition for the Existence of Periodic Solutions of Certain Three Dimensional Nonlinear Dynamical Systems
Authors: Quan Ting Ting , Li Jing , Sun Min
Published: December 2012

In this paper, we investigate a class of three dimensional nonlinear dynamical systems whose unperturbed systems have a family of periodic orbits. Firstly, we establish the moving Frenet Frame on these closed orbits. Secondly, the successor functions are defined by the orbits which go through the normal plane. Finally, by judging the existence of solutions of the equations obtained from the Successor functions, we obtain the necessary condition for the existence of periodic solutions of these three dimensional nonlinear dynamical systems. The result has important significance for the basic research of applied mechanics.
Rational Position of Apparatus for Removing Cotton Foreign Fiber in Dynamic Equilibrium
Authors: Wang Guan Jun , Gao Gai Li , Li Dao Liang , Hu Bao Lin , Liu Jun
Published: December 2012

Cotton processing technology in an automatic production line was presented. A pipeline used to set an apparatus for removing the foreign fiber was chosen in the cotton processing technology. The distribution and velocity of the cotton in five positions of the central plane of the pipeline were simulated by the Fluent software. The simulated curves of the cotton distribution and velocity were obtained. According to the curves, there is the optimal length of the cotton conveyed pipeline with a certain cross-section area to set the apparatus for removing the foreign fiber. There is no the steady zone if the pipeline length is shorter than the optimal value, and if longer than it, the pipeline will waste the material and space. The steady zone is determined by the forces. In the certain position of the straight pipeline away from the curved pipeline, the various forces, which act on the cotton or foreign fiber, are in the dynamic equilibrium, and the distribution and velocity of the cotton are steady. For the rectangular pipeline with the cross-section area 2960×120mm , its total length should be 7000mm, the steady zone length of the cotton distribution is about 2500mm, and the steady zone of its velocity is 1000mm. In the common part of their steady zones the apparatus for removing the foreign fiber may be setting rationally.
Numerical Simulation of Influence of Vegetation on Atmospheric Diffusion of Radon Emanating from Uranium Tailings Impoundment
Authors: Peng Xiao Yong , Xie Qing Fang , Wan Fen , Huang Shuai , Zhang Xin
Published: December 2012

Using the numerical simulation method, this thesis studies the radon concentration distribution in downwind area of the flat ground uranium tailings impoundment with and without vegetation on the beach face under the wind speed of 0.5, 1.0, 2.0 and 4.0m/s. The numerical results show that the radon concentration decreases gradually with the increasing wind speed and distance from uranium tailings impoundment. As the wind speed is 0.5m/s, the radon concentration is higher in downwind area of uranium tailings impoundment, and accumulation range is larger and local pollution also becomes more serious. However, radon concentration and accumulation range falls rapidly with wind speed increased to 4.0m/s. At the same wind speed, radon concentration under the condition of beach face with vegetation is higher than the one without vegetation within 600m range of uranium tailings impoundment along the downwind direction, but radon concentration is lower under the condition of beach face with vegetation out of 600m range. It illustrates that vegetation can inhibit radon diffusion to some extent.
A New Monitoring and Early-Warning System on Large Range Road Using IPv6 Network
Authors: Cheng Yong Chun , He Kun
Published: December 2012

According to the actual situation of large range road disasters in seasonal frozen area, the road safety can reflect by the slope stability, the subgrade stability, the bridge safety and the ice(snow) on the road.The objective of this paper is to present a new monitoring and early-warning system, which can be used on the large range road in seasonal frozen area. The system consists of four parts, which are slope monitoring system, subgrade monitoring system, bridge monitoring system and ice(snow) monitoring system. In this system, the small world theory is used to build an IPv6 p2p network structure and semi-structured data is used to store any type of early-warning data. In addition, a bridge in western Changchun City in Jilin Province was selected as the case study example. Monitoring and early-warning results show that the system is stable and efficient , also can improve the scalability and reduce the dependence on central server in IPv6 network.
The Study on Expressway Reconstruction Project of China
Authors: Yuan Chun Yi
Published: December 2012

Though the study on the tendency of expressway expansion at home and abroad, the paper analyses expressway reconstruction Project from macro levels of highway net optimization and micro levels of comparing with construction and expansion. And it finally raises some suggestions about optimizing reconstruction projects of expressway by making conclusion of current cases of existing expressway.
Road Network Pyramid Model
Authors: Cai Xian Hua , Bai Chun Guang , Dou Wen
Published: December 2012

It is a challenge in the research field of GIS-T and ITS to design a road network model that can well express the full range of transportation information. The existing Multi-hierarchy road network models often have some defaults, such as repeated storage of data, high degree of redundancy, difficult to analyze network, etc. Based on the analysis of image pyramid model and road feature hierarchy, a road network pyramid model has been proposed in this paper. This model has the adaptive ability to express multi-scale information and can descript road network the most detailedly with comprehensive road characteristic of all hierarchies. Low degree of redundancy of spatial and topologic data is another advance of the model. So this model is more suitable for multi-hierarchy analysis of road network.
A New Evaluation Model of Response Ability to Railway Dispatching Emergency
Authors: Qu Si Yuan , Xu Xing Fang
Published: December 2012

The emergency response ability plays a decisive role in the railway dispatching emergency disposal process and the evaluation of response ability is particularly important. Based on the establishment of evaluation system, the evaluation of response ability to dispatching emergency by interval number theory of uncertainty in mathematics was studied. With using [0,1] interval evaluation and taking three mean value to calculate index attribute and using weight method, the paper establishes the evaluation method of response ability to dispatching emergency. At last, taking the evaluation response ability to dispatching emergency of Shanghai Railway Bureau as example, it is proved that the proposed method is effective, simple and feasible. The new evaluation model would provide the reference for improving level of railway dispatching emergency disposal.
To Promote the Development of Container Rail-Sea Intermodal Transport in China Through Optimization of Railway Transport Organization
Authors: Huang Xiao , Xing Ran
Published: December 2012

To compare the proportion of container rail-sea intermodal transportation in container transportation at home and abroad, this paper analyzed the reasons of container rail-sea intermodal transportation development was relative lag in China were mainly shown on that trunk railway transport capacity was in shortage, the connection between ports and railway lines weren’t close, railway tariff mechanism was irrational, ports and railway stations were lacking in information sharing, and operation organization mode was imperfect, etc. In order to seek highly effective and economical modes of container rail-sea intermodal transportation and strive to develop the significant advantages of railway freight transport compared with other transport modes, in view of the above problems this paper proceeds from the railway transport organization and puts forward several programs, e.g. establish sea-rail intermodal transport channels, improve cargo sources organization, construct rail-port through transport mode and the passengerized transport organizing of container train, etc.
Forecasting Model of Maritime Accidents Based on Influencing Factors Analysis
Authors: Wang Dong , Yin Chao Zhong , Ai Jian
Published: December 2012

The factors affecting the maritime accidents are complicated. Digging up the factors and finding out the inherent laws,maritime accidents can be forecast in a short-term and medium-and-long-term.The paper analyzes the factors and discusses the BP neural network modeling process of maritime accidents based on influence factors. Through the validation, the forecast model of maritime accidents is feasible.
Ecological System Theory in Planning and Design: Ecological Conception and Level Analysis
Authors: Sun Ke Zhen
Published: December 2012

Ecological System Theory in planning and design is discussed in this paper. The article studies the composition of urban, landscape and building ecosystem, integrated ecology and design, integrated uses in urban and landscape area, the method of interdisciplinary working. System theory is involved in this paper to discuss relevant questions. In addition to these, the article gives account of ecological engineering in all-around, including ecological denotation and connotation analysis, the wider sense and the narrow sense, the general level and the high level about ecological engineering. This article argues the problem of ecological strategies in the landscape design and planning, and the main contents of ecological strategies. It includes the strategy of landscape sustainable development, which is in conflict with rapid economies and historic preservation, ecological conservation.
Lane-Based Road Network Model and its Application in Simulation Road Network Modeling
Authors: Huang Min , Rao Ming Lei , Li Min , Niu Zhong Ming
Published: December 2012

Traffic road network is one of the fundamental components in Intelligent Transportation System (ITS). This paper analyses the requirement for traffic road network in ITS, and constructs a lane-based road network model. The model which describes traffic network from different levels is composed of 5 kinds of elements: link, node, arc, lane and lane connector. In level-1, the basic unit of the model is link or arc, which represents the road section with the constant traffic organization. That means the number of lanes, the attributes of lane and the topological relationship between lanes in link or arc are constant. In level-2, lane and lane connector give the detail information of the network based on arcs. This model can support various research and application fields in ITS. Finally, we take the network modeling in traffic simulation as an example. The simulation traffic network in TransModeler is extracted automatically from the traffic network database that is constructed on the lane-based network model.
Exploration Interactive Development between Mountain Towns Ecological Security and Tourism Industry − Take Ye Sanguan as Example
Authors: Li Gui Yuan , Yu Fei Fei
Published: December 2012

Based on the ecological security perspective, because of the natural resource endowment, the industrial layout of mountain towns was combined mode of specialty agriculture and mountain tourism. According to elaborating the concept and connotation of ecological safety of the mountain town, combing the mountain town development as well as the characteristics of the mountain complex ecosystem, taking examples to analyze the characteristics of natural resources of mountainous towns and urban development in Western Hubei, this paper has researched interactive development strategy between mountain towns ecological security and tourism industry from the theory of urban science, ecology and other disciplines ,and it aims to promote development of settlements environment construction ,which is more healthy and orderly.
Studying the Effect of Coordination on the Drivers Behavior during Signal Change Intervals at a Typical Intersection in Tokyo, Japan ~ Detailed Methodology and Hypotheses
Authors: Ahmed Rasheed Mirza , Tanaka Shinji , Oguchi Takashi , Hong Sungjoon
Published: December 2012

The traffic flow at approaches to signalized intersections is determined by a multitude of factors. This results in randomness in the parameters that have to be estimated in order to calculate the signal change intervals. If factors influencing the distribution of these parameters can be identified, less safety margins may be feasible. In this way the approach capacity may be increased without compromising safety at the intersection. In this research, it is considered that the coordination of signals is a determining factor to set the signal change intervals. Thus, this research is an effort to study the effect of signal coordination and the arrival patterns generated from it on the driver’s behavior at the onset of yellow indication. It is hypothesized in this research that the vehicles generally require different signal change intervals in case of coordinated approaches compared to if the approaches were un-coordinated. Field surveys will be conducted in order to study the driver’s behavior under different conditions of coordination. After completing the extraction of data, analysis will be performed on various driver behavior parameters deemed essential for this study in order to establish the difference in the behavior of drivers for the two different cases of coordination and arrival patterns that were under observation. It is expected that the research results will lead to a potential to improve the signal coordination strategies and to achieve safe and efficient design for signal change intervals.
A Signal Priority Algorithm for BRT Based on Intersection Resource Integration
Authors: Yang Zhao Sheng , Tian Chun Lin , Liu Song Nan
Published: December 2012

Real-time scheduling and signal priority strategies play a critical role in improving the service quality of Bus Rapid Transit (BRT) system. The delays of public passengers and social vehicles are essential factors that should be considered for signal priority control. This paper proposes a signal priority algorithm for BRT based on intersection resource integration from the angle of intersection time and space combinatorial optimization, which combined optimize lane functional partitioning and green ratio allocation. The results of the data validation proves that the optimization model can significantly reduce the BRT vehicle delay at the intersection, while reducing the adverse effects of social vehicles.
Exploration on the Impact of Traditional Chinese Philosophy on Urban Planning in Ancient China
Authors: Liao Qi Peng , Yang Shu Lan
Published: December 2012

The political system in ancient China based upon Confucian philosophy and the advocation of Taoist philosophy once had profound influence on the urban planning and construction in ancient China, and a relatively complete urban planning and construction system had been developed accordingly. Under the “ritual system” in Confucianism, the central axis of urban roads, spatial sequence of architecture, rigid urban layout reflected the rigid hierarchy and ethical order of the society. Taoist philosophy emphasized the harmony between humankind and nature, and highly valued the protection of ecological environment during the urban construction process. These traditional urban planning system and thought summarized the experience in urban planning and construction in ancient China. We should discard the dross and assimilate the fine essence, and develop the unique cultural characteristics of urban construction in China.
Improved Genetic Algorithm for Capacitated Vehicle Routing Problem
Authors: Ren Chun Yu
Published: December 2012

This paper studies capacitated vehicle routing problem. Since the standard genetic algorithm is short of convergent speed and partial searching ability as well as easily premature, improved genetic algorithm is then adopted as an optimized solution. Firstly, sequence of real numbers coding is used to simplify the problem; it may construct the initial solution pertinently in order to improve the feasibility. The individual amount control choice strategy can guard the diversity of group. The combined hill-climbing algorithm can strengthen the partial searching ability of chromosome. Finally, comparing to a set of standard test problems, simulation results demonstrate the effectiveness and good quality.
Improved Heuristic Search Algorithm for Multi-Cargo Loading Problem
Authors: Ren Chun Yu
Published: December 2012

The paper is focused on the Multi-cargo Loading Problem (MCLP). And solve this type of problems utilizing improved Heuristic Search Algorithm from the overall situation. According to the features of the problem, the essay centered the construct initial solution to construct neighborhood structure. For the operation, 1-exchange and 2-opt* were applied, it can also fasten the speed of convergence, and boost the search efficiency. Finally, the good performance of this algorithm can be proved by experiment calculation and concrete examples.
An Integrated Predicting Model of New-Built Regional Logistics Center’s Demand Based on the Artificial Neural Network
Authors: Luo Jian Feng , Ma Tian Shan
Published: December 2012

In order to predict the scale of logistics demand for a new-built regional center, economic indicators and the other related measuring indicator of the scale for logistics demand is studied. The factor analysis and back propagation (BP) artificial neural network theory are applied to set up a model for predicting the scale of the logistics center’ s demand. The factor analysis is applied to this model to reduce the number of indicators of the input layer in the BP artificial neural network, and to reduce complexity. Then model is introduced to fit historical data of the scale of new –built a regional logistics center’ s demand .Finally,a third-layer BP artificial neural network is constructed. This model was applied to predict the scale of the logistics demand in an example and the forecasting result shows that forecasting accuracy of the model is good. It also provides a new way of a new-built regional logistics center’ s demand forecast.
Research on Key Elements of the Regional Logistics Capability Considering Integration of Evaluation, Prediction and Planning
Authors: Zhang Yan , Wu Gang , Wang Zheng Bin
Published: December 2012

So far, most of the existing researches regard the key elements of the regional logistics capability as an isolated object and neglect the logical relationship and interdependence among links of regional logistics development’s process. This will slow down the developing speed of the regional logistics. Considering the impelling and linking relationship between the evaluation, prediction and planning of the regional logistics capability, this paper, guiding by the idea “integration”, studies the definition, the main participants, the goal and the key elements of the regional logistics capability, and then proposes that the result of evaluation and prediction as well as the implement measures of planning should be one-to-one correspondence with each key element.
Planning and Design for Nanjing Logistics Park of Automobile and Auto Parts
Authors: Xue Liang
Published: December 2012

Logistics Park is the highest level of the logistics node in the City logistics system. The planning and design of this Logistics Park strives to meet the requirements of different levels as well as effectively integrate from the perspective of spatial the existing logistics resource, yielding the maximize benefit socially, economically and ecologically. This paper refers to the general impression currently in Nanjing that the distribution of the Auto 4S shop and automotive spare-parts shop is scattered thinly, and the shortage of auto and spare-parts happens oftentimes, then proceeds with systematically planning and detailed feasibility studies from market analysis, strategic positioning, functional design, layout design and business plan, and then provides a scientific and theoretical basis for the planning in building this logistics park in Nanjing.
Asymmetric Effect on Jamming Transition in Biham-Middleton-Levine Traffic Model
Authors: Zhang Guo Xin , Kuang Hua , Fan Yan Hong , Kong Ling Jiang , Li Xing Li
Published: December 2012

Asymmetric effect on the dynamical jamming transition in Biham-Middleton-Levine (BML) model with random sequential update rule is studied. The numerical simulations show that under periodic boundary condition, the system exhibits a sharp transition from freely moving phase to completely jamming phase, and the critical density is smaller than that of original BML model with synchronous update rule. For the asymmetry of system size, it can be found that the critical density is independent of the system size only when the width W and the length L are larger than some critical values respectively. Furthermore, the phase diagram shows that the asymmetric effect of the number of vehicles in two different directions plays a key role in reducing the occurrence of jam, and the underlying mechanism is analyzed.
The Evaluation of Highway Collapse Hazard Based on the Fuzzy Comprehensive Evaluation Method
Authors: Yan Jian Long , Cheng Yong , Zhang An Hu , Zhao Yun Gang
Published: December 2012

Highway collapse hazard is the combined result of many factors. Based on the formation mechanism of the road collapse hazard and main the factors, they are selected from three aspects of risk assessments master factor: the regional geological structure, slope characteristics, and regional environmental characteristics, also ultimately select the spacing of the joints, slope lithology, slope structure, slope height, slope gradient, rainfall (rainfall in 24 hours to ≥ 25mm of days), the vegetation coverage degree and earthquake strong eight main control factors, above all these factors, they established a road collapse hazard evaluation index system. Based on the fuzzy comprehensive evaluation method, it establishes a road collapse hazard evaluation model. Analytic Hierarchy Process is used to determine the evaluation index system of layers in index weight values. Risk index is based on the evaluation criteria. Finally, an empirical study of two highway projects instances.
Road Traffic Crash Accident Distribution Law Analysis in China
Authors: Li Yao Ping , Cao Zhe , Feng Long , Yang Zheng Gao
Published: December 2012

This paper is to reveal the distribution rules of highway traffic accident in China. Using statistics data, this paper discusses highway traffic accident frequency and severity distributions by various factors, including temporal dimension, road factors (such as road classes or functions, geometric alignment, etc.), vehicles factors, and drivers’ factors in details. The distributions of highway traffic accident type and highway traffic accident causes are also examined in the paper. A series of useful and interesting conclusions are available for domestic and overseas traffic policy-makers and road safety engineers.
Effect of Multi-Slowdown Sections on Traffic Flow
Authors: Fan Yan Hong , Kuang Hua , Zhang Guo Xin , Kong Ling Jiang , Li Xing Li
Published: December 2012

Based on the NS model, an extended cellular automaton model is proposed to simulate complex characteristics and energy consumption of traffic flow with some slowdown sections on a highway by considering the number, speed limit and distribution of slowdown sections. The simulation results show that the present model can exhibit a multi-phase coexistence phenomenon, i.e., the freely moving phase, the maximum flow phase and the jamming phase coexist in traffic system. The fundamental diagram shows that the number of slowdown section has no influence on the mean velocity and flow. However, energy consumption increases with increase of the number of slowdown section at low density. In addition, it can be found that the speed limit and distribution of different slowdown sections have an important effect on traffic flow and energy consumption, and the underlying mechanism is also analyzed.
Feasibility Study of Traffic Signals at Intersections in Peshawar, Pakistan
Authors: Khan Rawid , Dastagir Ghulam , Shahid Omar , Ahmed Zeeshan , Alam Bashir
Published: December 2012

The paper is part of an ongoing research project on traffic management strategies for Peshawar Pakistan. Traffic data collected and warrant tests checked at selected intersections. Peak hour vehicular volume warrant test selected and performed at intersections. Signal timing capacity and delay analysis performed and level of service determined for selected intersection. It was found that “for the same width of the road” the delay and level of service is different at different locations and the corresponding signal time is also different. Some data also analysed in 3D micro simulation.
Traffic Incident Duration Prediction Based on K-Nearest Neighbor
Authors: Wen Yuan , Chen Shu Yan , Xiong Qin Yuan , Han Ru Bi , Chen Shi Yu
Published: December 2012

Prediction of incident duration is very important in Advanced Intelligent Traffic Incident Management and the accuracy of prediction can provide exact information for travellers. It is widely used in the area of ITS. In this paper, K-Nearest neighbor (KNN) is employed to predict the incident duration, which puts forward a new distance metric and weight determination method. This KNN model is created based on the incident data set collected by DVS-Center for Transport and Navigation, Ministry of Transport, Public Works and Management, the Netherlands. Moreover, a simulation based on Matlab is used for incident duration prediction and optimizing the best k value. Finally, an error analysis is made based on this simulation. As a result, this method (KNN) obtains high accuracy and has a better effect than Bayesian Decision Method-Based Tree Algorithm. So it can be effectively applied to intelligent traffic incident detection and clearance systems.
An Evaluation Model for Traffic Guidance Measures of the Urban Central Commercial District and its Application
Authors: Cui Miao , Cheng Tie Xin , Chen Jing Zhu
Published: December 2012

As the city’s economic and cultural center, the urban Central Commercial Districts (CCDs) are rapidly developing, which always brings the heavy traffic jam in the city. In this paper, the traffic flow of CCDs was analyzed, and the traffic flow guidance evaluation model was established. Firstly, according to the travel time function, traffic flow was allocated to the road network of the CCDs by the dynamic assignment model, and the heavy-traffic roads were identified. Then, traffic flow guidance measures mainly including forbidding straight, left turn, or right turn were given, and the evaluation model above was applied to select the optimal measure. Finally, with VISSIM simulation software, the model was applied to the Tianjin Binjiangdao CCD, which illustrated that the satisfied guidance measure can be selected effectively.
Research and Evaluation on the Coordinated Control System in Urban Trunk Road Contained Pedestrian Crossing
Authors: Chang Hai Tao , Bi Jun
Published: December 2012

We analyze the road environment of the present urban main road and the motor vehicle traffic conditions firstly, from which we see that crosswalks should be added and some intersections should be signal control optimized. Then using the timing linear control system theory which is suitable for China, the paper optimizes the crosswalk and intersection signal timing. Simulation is conducted with simulation software of VISSIM in the end, obtaining that after arterial road coordination, although a crosswalk is added in optimized arterial road, the total stop delay and the travel time of the mainstream vehicles are effectively reduced. The program satisfies the need for pedestrian crossing, and obtains better green wave band of arterial road.
Road Accident Analysis Factors
Authors: Esmaeeli Hamed , Abbaszadehfallah Iman , Bin Chepuan Othman , Hosseini Seyed Hossein
Published: December 2012

A large number of fatalities on road are occurred by vehicle accident. One of most significant causes of accident on road is increasing car ownership in last decade. The study is conducted to determine a relationship between car ownership and accident rate. The most effective parameters on increasing accident rate in developed countries are studied. This paper investigates a model that forecast the rate of accident on based on previous collected car ownership data. Meanwhile, those parameters can change the rate of car ownership such as income, distance between residential area and work zone, the number of employee over family size and registered car over employee are studied. The study is conducted on based on Australia data and Robust- regression techniques are used to analyse the data. The result shows robust regression reached the most effective coefficient to reduce fatalities on road.
Location Model of Public Parking Facilities Basing on the Optimal Total Social Cost
Authors: Ni Xun You , Ma Xiao Dan , Xia Xiao Mei
Published: December 2012

In order to optimize the location of public parking facilities based on the optimal total social cost, location selection and scale settings are considered as the main contents. By analyzing the cost factors and the restrictions, a location model of public parking facilities is formulated with the objective to minimize the total social cost. Under the assumption that the requirement distribution of the public parking is agreed to the Gravity Model, the optimization algorithm of the schemes selection is proposed to fully search the solution space. Finally, a numerical example is carried out to illustrate the proposed model and the algorithm.
Speculation of the Barrier-Free Design about Humanization and Generalization in Urban Transportation Hubs
Authors: Zhang Xiao , Li Chao Yang
Published: December 2012

The barrier-free design of transportation hubs is the embodiment of modern civilization and the requirement for the city development. The barrier-free design of urban transportation hubs in Singapore has implemented the people-oriented concept and built a systematic, delicate, harmonious public barrier-free environment. By analyzing the barrier-free design of transportation hubs in Singapore and taking into consideration the speeding population aging and the growing demand of disabled people to integrate into society in our country, the enlightenment is summarized, which will provide reference to the establishment of barrier-free system of our urban transportation and the development of harmonious society.
The Research of Public Traffic Safety Evaluation System
Authors: Chen Pei , Liu Xuan , Qiao Jian Gang
Published: December 2012

In order to improve the security of public traffic, In the road engineering, traffic engineering facilities for basic theory,analyze the factors that affect public transport safety,and then conduct extensive questionnaire,analyze the degree that the major transport facilities affect the safety of traffic,determine the evaluation index and use the analytic hierarchy construct public transport safety evaluation system.Finally,applicate evaluation system to determine the best time for preventive maintenance of road markings,and also provide a new way of thinking for the study of traffic safety.
The Optimization Method to Transfer Bus Routes for Rail Transit Terminal Station
Authors: Zhang Sheng , Liu Wu Sheng
Published: December 2012

The optimization model is framed with a goal to minimize overall consumption of travel time for passengers. A variety of constrains are considered, including time, capacity, stop number, profit and so on. According to the features of the model, the hill-climbing algorithm is adopted to obtain the initial solution, which reduces the time of optimization. Meanwhile, direct order encoding method, namely node method, is introduced for encoding, construct a Hybrid Genetic Algorithm for the solution. The results show that adapter value is more steady and the model result is preferable when the variation rate is increased while the number of iteration is decreased.
Study on the Interaction of Urban Planning Factors and Traffic Mobility in Gifu City by Using Historical Map, Statistics and Person Trip Survey Data
Authors: Guo Min , Kurauchi Fumitaka
Published: December 2012

Rapid urbanization and growing economic prosperity had brought a higher rate of motorization in developed countries and now in developing countries also. History can provide valuable information and lessons on the interplay of factors that shape urban growth and development. This study examines changes in urban planning factors especially in transportation system and traffic mobility of Gifu City during the late 20th century when Japan was in the high economic growth period. And by looking at the result, in Gifu, with development of motorization, as the same time as policy planning was made that attached importance to construct road network and the withdrawal of city tram, the land use development was also focused in surrounding area and suburban area. As the result, Motorization grew more and more in Gifu city and Gifu city is being plagued by the doughnut phenomenon. It is important to find the relationship of urban planning factors to give experience for future urban planning and transport planning.
Study on Vehicles Speed Discreteness on the Road of Urban-Rural Ecotone
Authors: Li Yan
Published: December 2012

Urban-rural ecotone is separate geographical unit, and it is in the parallel connecting area of the city and countryside. With the rapid economic development, traffic accidents in the area showing a significant increase in the trend. Because of vehicles in urban-rural ecotone of many types, traffic is more complex, speed variations and high frequency of speed changes, a greater impact on such sections of road traffic safety. Therefore, this article by the typical section of the survey, combined with the traffic simulation software, using grey relation entropy analysis method to analyze speed discrete of the urban-rural ecotone road, so as to clear the characteristics of various types of vehicles speed.
Traffic Behaviors Simulation under Congestion Pricing Revenue Redistribution Strategy
Authors: Zhao Ze Bin , Tian Yu
Published: December 2012

On the basis of behavioral model under congestion pricing revenue redistribution, this paper proposes the general idea, process of the simulation and designs the essential simulation module of congestion pricing revenue redistribution based on the Multi-Agent technology and Starlogo. Traffic behaviors are simulated under the situation that congestion pricing revenue is used to raise the level of bus service and extend the road capacity. Also the simulation is compared with other two situations with and without congestion pricing. The results demonstrate that this method overcomes the localization of the traditional micro traffic flow simulation model, and the traffic flow of congesting section can be effectively reduced and distributed more optimal.
Study of the Effectiveness of Metro Transfer System in Beijing Based on the Result of SP Survey
Authors: Ji Xun , Shao Chun Fu , Shen Xiao Peng , Zhao Yi
Published: December 2012

Based on the result of SP survey, the transfer problems are classified and analyzed in detail. Then this paper conducts research on the passenger demand for metro transfer system. By using the Multinomial Logistic Model, the transfer impact factor is analyzed which could provide basical support for the improvement, planning and construction of public transit transfer system.
A Multi-Input FFFB Control Algorithm for Railway Rapid Transit Vehicle Speed Regulation
Authors: Lin Chiu Feng , Cheng Chii Chung
Published: December 2012

The purpose of this research is to develop a multi-input control algorithm for the speed regulation of railway transit vehicle. The Taipei railway transit vehicle is chosen as the simulation object in this research. This transit vehicle has three carts and is push-pull type; only the first and the last carts are empowered. The control algorithm is to calculate the appropriate driving forces for the power units such that vehicle can follow a specified speed pattern. A feed-forward and feed-back control algorithm is designed to achieve this purpose. In the system, a dynamics variable observer is also developed to reduce required sensors for the controller. The results show that the developed controller is suitable for this purpose and the observer achieves acceptable observation quality for the controller application.
A Rectangular Energy Absorbing Box with Better Energy Absorption Effect and the Study of its Energy Absorption Factors
Authors: Lin Cheng , Zhang Xiu Hua
Published: December 2012

Based on the characteristics of the better energy absorbing effect of octagonal energy absorbing box with multi edges , we put forward a rectangular energy absorbing box is stamped with certain depth waveform in the length direction to improve the ability of energy absorbing, else, the affection of stamping depth、stamping width、fillet radius、rectangular aspect ratio and placement mode on energy absorbing is studied. The conclusion of the thesis is hoped to provide some reference for some related researchers and manufacturing enterprises and apply to practical production early.
The Running Comparative Analysis of the LNG Bus and the Fuel Oil Automobile in Plateau Region
Authors: Cao Zhe , Li Yao Ping , Sun Feng Shou , Feng Long , Gong Hang
Published: December 2012

Liquid Natural Gas liquefaction can greatly save storage space and cost, and has the calorific value big performance higher characteristic. Through the test, 1 # LNG test bus and 2 # diesel test bus, 3 # gasoline test bus operation compared fuel costs saving rate were 20.86%, 21.63%; CO, HC emissions decreased obviously. However, the main problem of LNG bus is power ratio decreased significantly and lack of power during climbing acceleration.
The Turning Radius Analysis for Pneumatic Beam Transport Trailer of Principal and Subordinated Vehicle Model with Combination of Four-Wheel Steering and Articulated Frame
Authors: Sun Zhen Jun , Yan Xiao Fei , Han Li Jun
Published: December 2012

This paper put forward a struction model of pneumatic beam transport trailer of principal and subordinated vehicle model with combination of four-wheel steering and articulated frame. Its steering conditions are analyzed. The steering condition and the method of determining of the minimum turning radius and the calculation formula of turning radius are obtained.
Design and Simulation on the Powertrain of Plug-in Hybrid Electric Vehicle
Authors: Tan De Rong , Dong Chun Ying , Jing Wang
Published: December 2012

In this paper, according to actual power demands of the bus, its powertrain was designed. In this process, the lowest oil consumption was the goal on the foundation of meeting basic power need. The co-simulation with Plug-in vehicle model was realized in Cruise, using the control strategy model which was established by the Stateflow in Simulink. Simulation results indicated that modified Plug-in hybrid electric bus not only can reach the expectant power indictors, but also improve the fuel economy. So, this research played a leading role in the design and research of hybrid buses’ parameters