bluuebunny/crossref_metadata_2025 huggingface dataset:
Studies on the Residual Settlement of CFG Pile Composite Foundation of the Wuhan-Guangzhou High Speed Railway
Authors: Zhang Feng , Xu Zhao Yi , Li Zhi Yi
Published: June 2012

Wuhan-Guangzhou passenger special line is the most important backbone of China high speed railway net. The line span is 968 km, among of them; roadbed is 388 km, occupied 40.1% of the total line. Due to the rigorous residual settlement of the roadbed, the CFG (Cement Flayash Gravel) pile is used as the composite foundation to enforce the intensity of roadbed and reduce the post-settlement. The paper studies on CFG pile composite foundation at the Wuhan experimental section, using the finite element numerical simulate the interaction of the pile and pile surrounding soil under the permanent load conditions. The results show that the stimulation model has the more accordance with the actual observation results. The residual settlement comes from the soil layer is bigger than the pile length.
A Method for Temperature Correction of HMA Dynamic Modulus
Authors: Ye Ya Li , Zhuang Chuan Yi , Zhang Ren Feng
Published: June 2012

HMA dynamic modulus is one of key inputs to the Mechanistic-Empirical Pavement Design Guide. In order to analyze and evaluate bearing capacity of asphalt concrete pavement and to determinate the rules of pavement deterioration of modulus of asphalt layer under repeated wheel load and ambient, temperature correction for HMA is applied to the modulus so as to compare them with the same temperature. In order to get temperature correction coefficients for HMS moduli, a method of temperature correction for HMA moduli was put forward. In this method, the specimen of asphalt mixture or HMA cores from in-situ pavements were tested by Superpave Simple Performance Tester(SPT), or falling weight deflection(FWD) was tested on the site of in-situ pavements. The correlation between HMA dynamic modulus and temperature was regressed, and then dynamic modulus regression model was put forward. Results show that exponential function was fitted to the data to determine and adjust the modulus to a reference temperature, the recommendation regression equation can reflect the features of asphalt mixture at the reference temperature.
Study on the Performance of Graded Gravel Roadbase in Freeway Asphalt Pavement
Authors: Wei Lian Yu , Liu Jing Li , Ma Shi Bin , Wang Qing Zhou
Published: June 2012

The elastic modulus of graded gravel material has a paricular characteristics of nonliner. The objective of this study is to discusses the performance of graded gravel roadbase in freeway pavement using KENLAYER computer program. Asphalt Institute (AI) and Shell design methods have been considered using equivalent standard axle load (ESAL) and spectrum of axle methods of incorporating traffic for the design period. Design life in years is determined using fatigue cracking models and rutting models in KENLAYER computer program, which is feasible in the life forecast of graded gravel roadbase. It is beneficial to graded gravel roadbase′s popularization and application in freeway pavement.
The Study of Solar Photovoltaic Building Integration Design Methods
Authors: Zhao Zhi Qing , Tao Li
Published: June 2012

Today the energy crisis is increasingly tense, because the solar building has the advantages of ecology and sustainability, it has broadly prospects for development, and it is increasingly becoming a new architectural concepts and methods. The paper systematically described the experience of BIPV technology applications, forecast the development trends, discussed the key issues needing to dispose and put forward a viable development strategy. Through specific examples, this paper carried out in-depth study and conducted a comprehensive discuss about the relevant issues. This is very meaningful to solve the global energy crisis and establish a low-carbon world.
Study of Traffic Accessibility in Poyang Lake Economic Zone Oriented by High-Speed Railway
Authors: Yin Hong Yan
Published: June 2012

The high-speed railway framework can promote the harmonious development in the unbalanced regions. Based on construction experiences and spatial development of high-speed railway, the spatial effects were analyzed in traffic economic belt, regional balance, spatial organization reconfiguration and urban environment improvement. According to the high-speed rail plan of China, the traffic accessibility of spatial organization in Poyang lake economic zone were discussed in internal traffic accessibility and external traffic accessibility. The study results showed that the hub-and-spoke patterns of the spatial traffic organization reconfiguration in Poyang Lake agglomeration can realize the regional balance oriented by the high-speed railway. The patterns can be also applied to other underdeveloped and unbalanced regions.
Urban Traffic Management and Urban Planning
Authors: Liu Ji Peng , Tang Zhen Xing
Published: June 2012

At present, traffic problem has become one of the biggest problems about the development of urban city in China. Faced with this problem, it is important for traffic planning to keep traffic be in accordance with the city. It is a challenge to urban planning, especially to the traditional method by land utilization planning. To relieve traffic congestion and other issues blocking, we can not only enhance road construction, but also make some innovation about the new thoughts and methods for the functional departments of the government. This is the key to solve the urban traffic problem for the time being.
Steering Transportation Planning into Sustainable Development Strategy
Authors: Li Tie Jun , Chen Kuan Min
Published: June 2012

The primary purpose of this paper is to introduce the performance approach to assess the adaptability level of transportation system to urban development requirement. Thirty six single measures belonging to ten fields are selected to construct the evaluation index through weighted linear integrated processing, and then weight of expert matrix is estimated by a SVD based AHP method to improve the required precision of matrix with acceptable consistency and amend the significant elements via distance and proximity so as to improve the whole consistency. Taking Xi’an city for the case study, analysis results indicate that the adaptability performance of transportation system to urban development requirement is in a decreasing state, which provides robust and deep insight for decision-makers working on a range of problems and in various circumstances.
The Study on Vehicle EHA Active Suspension with Time-Delay Control
Authors: Kou Fa Rong
Published: June 2012

A new vehicle active suspension with Electro-Hydrostatic Actuator (EHA) is suggested. The system consists of two parts: spring and actuator with variable control force. The actuator includes hydraulic cylinder, hydraulic pump, controller, etc. According to bond graph principle, bond graph model of EHA active suspension are built. For vehicle active suspension system, unavoidable time delay may appear in the controllable course. Time-delay influence on the dynamic performance of vehicle active suspension is analyzed. Physical prototype and experimental rig for EHA active suspension is built. Then the tests of suspension prototype with time-delay control are carried out on the developed test rig. The results show that the sprung mass acceleration of the active suspension with time-delay compensation significantly declines by 11.56% under the road input of 1.1Hz and by 12.8% under the road input of 1.5Hz
Study on Running Performance of Train and Index of Traffic Safety of Shangbaipu Bridge
Authors: Zhou Zhi Hui , Qian Zhi Dong , Liu Guo , Wen Ying , Zeng Qing Yuan
Published: June 2012

The running performance of train on Shangbaipu bridge is analyzed with energy random analysis theory for derailment. The calculated result shows that the running safety of train cannot be ensured with the existing operation condition, and the measurement of rate-limiting or reinforcement is needed to be taken for this bridge. A method for establishing index of traffic safety for railway bridge is proposed, and the detailed contents are as follows. The lateral amplitude on the middle of beam is determined as index for traffic safety for beam-pier system. The critical beam-pier system with which the running performance of train can be guaranteed is determined. The lateral amplitude of critical beam-pier system is calculated and determined as limit value for traffic safety. The limit value of lateral amplitude for traffic safety for Shangbaipu bridge is determined as L/4000.
Process Optimization for Welding Stainless Steel Clad Material Based on Orthotropic Bridge Plates
Authors: Fang Ji , Li Yong Zhi
Published: June 2012

Clad plates welding of stainless steel welding on interlayer between grass roots and the transition layer is a key technology.Structure and properties of welded joints is very uneven,and there have often welding repair cracks. Clad plates of stainless steel material is used to weld under construction in the Southern link’s railway bridge for the first time at home .However, there occurs welding warpage of the convex parts and roughness appears excessive on the overall clad plates and severe deformation, and the quality of railway bridge is affected seriously. Reasons of the impacting welding quality are analyzed and specific measures to control them are proposed and the construction program is optimized.the efficiency and quality of welding can be improved ,a good foundation for the compound plates welding is layed,it will be contribute to ensure the overall quality of the welding quality of railway bridge especially the use of clad plates.
Finite Element Analysis of Thermal Stress for Cable-Stayed Bridge Tower with Cracks
Authors: Feng Zhong Ren , Shen Jian , Wang Xiong Jiang
Published: June 2012

The application of ABAQUS in thermal stress analysis of mass reinforced concrete, focusing on the temperature field, crack propagation, ABAQUS modeling, finite element analysis approaches of thermal stress, is reviewed first in this paper. Then, based on the observation of one cable-stayed bridge pylon, a finite element analysis of existing crack tips in temperature stress is done, and the simulation results are compared with the measured ones to verify the validity and accuracy of the finite element calculation.
Technical and Economic Analysis on Self-Insulation Schemes of 65 Percent Energy Efficiency for Residential Buildings in Hot Summer and Cold Winter Zone
Authors: Lin Hui , Feng Xiao Ping , Zhang Pen Fei , Han Yu
Published: June 2012

With the further promotion to the energy conservation of buildings, the standard of 65 percent energy efficiency is gradually popularized. Because of some existing problems in external insulation Technology, such as security, durability and seepage, Self-insulation technique has been more and more concerned. In this paper, a kind of external insulation scheme and three kinds of Self-insulation schemes are designed for a typical residential building in Wuxi region. These schemes are simulated for energy consumption calculation and Economic Analysis by BECS software. The results show that self-insulation schemes not only meet the standard of 65 Percent Energy Efficiency, but also have more economic benefits than external insulation schemes.
Investigation of Dynamic Load Test of an Existed Reinforced Concrete Rigid-Frame Arch Bridge
Authors: Liang Tian , Dong Jun , Yang Liang Liang , Yan Dong Hai
Published: June 2012

For an existed reinforced concrete rigid-frame arch bridge in reconstruction project, reinforcement effects of the bridge are studied and discussed while the original load grades are maintaining and it is based on dynamic load test including scheme, execution and FEM analysis in this paper. In our investigations, such characteristics as dynamic flexibility, impact coefficient, natural vibrations and dynamic responses are analyzed. All the investigations show that the bridge meets the original-designed-loading requirement, which behaves well in dynamic characteristics after being strengthened and whose stiffness also satisfies requirement.
Analysis of Temperature Effect on Cable-Stayed Bridge at Construction Stage Corrected
Authors: Yang Ji Xin , Yang Ming Chao
Published: June 2012

Temperature in the concrete box girder caused by sunshine has a significant influence on the deflection, stress and strain of the beam. Based on the Xinjiang Bridge, through measuring the deflection, temperature, stress and strain at the largest cantilever stage,then compare the measured results with finite element analysis results to investigate the impact of temperature gradient on the construction of cable-stayed bridge.
The Study on Bearing Capacity Influence for the Steel Tube Deformation in CFST Arch Bridge
Authors: Zeng De Rong , Wang Tie Jun
Published: June 2012

The theoretical formulas of the ultimate bearing capacity and critical stress of the deformed steel tube in a CFST arch bridge are gotten by the local section steel tube analysis and the elastic buckling analysis of steel tube, At the same time, the ultimate bearing capacity and critical stress of the deformed steel tube are computed by using ANSYS finite element analysis software and compared, which verifies the theoretical formulas are correctness and feasibility. Finally, a reduction factor formula of the ultimate bearing capacity of the tube before and after deformation is gotten; it directly reflected the reduction level of the ultimate bearing capacity of the deformed steel tube.
Reinforcement Experiment of a Hollow Slab Bridge by External Prestressing
Authors: Li Xiao Long , Wang Fu Ming , Li Xiao Nan , Zhong Yan Hui
Published: June 2012

Simply supported hollow slab bridge is widely used in highway network of China. Under overload vehicles, the concrete hinges of such bride are easily damaged, which usually causes single slab bearing and tremendously reduces the bridge’s load capacity. It is necessary to take some reinforcement measures to enhance the carrying capacity of such impaired bridge for traffic safety. In this paper, a field reinforcement experiment of an actual hollow slab bridge, which has experienced a destructive test with its transverse connections seriously damaged, was performed by applying external transverse and longitudinal prestress to it. The strengthening scheme adopted in this experiment was detailed. By means of static truck load test, the variation of deflections of the bridge before and after strengthening was obtained. The test results showed that the proposed strengthening method can effectively enhance the damaged hollow slab bridge’s transverse stiffness and improve its bearing capacity.
The Finished Product of Rubber Bearing Mechanical Performance Analysis in the Low Temperature
Authors: Yu Tian Lai , Yuan Dong Ye , Sun Xiao Long
Published: June 2012

In this paper, an experiment is carried out on compressive elastic modulus, shear modulus, silicon fat consistency and peel strength of synthetic rubber bearing and cold type natural rubber bearing produced in Shanghai Rubber Factory under low temperature condition. The experiment reveals the mechanical property of rubber bearing and change law of cooling temperature difference which offers reference and guidance for the selection of rubber bearing products under low temperature condition.
An Investigation into the Dynamic Mechanical Behaviors of Special-Shaped Arch Bridges
Authors: Kou Chang Huan , Kao Chin Sheng , Yang Ming Chang , Wu Tsung Ta , Ma Shih Wei
Published: June 2012

By building a finite element model of a special-shaped arch bridge, this paper discusses the effects of the changes of the geometric shape, and the skewed angle of the girder and arch on the dynamic characteristics. During the free vibration characteristics analysis, changes in the rise-span ratio had a relatively significant impact on the special-shaped arch bridge’s free vibration frequency since the basic frequency would increase as the rise-span ratio decreased. Changes to the rise-span ratio had a relatively minimal effect on the in-plane vibration status, while it had a significant effect on the out-plane vibration status. This difference is because at the in-plane, the curved structure receives a significant amount of axial force, while at the out-plane, the transverse load response is stronger.
Stochastic Responses of Vehicle-Bridge Coupling System
Authors: Lin Min , Zhang Xiang Wei , Chen Si Yuan
Published: June 2012

In this paper,we want to obtain the research of virtual vehicle-birdge coupling system, a vehicle-bridge coupling model was established based on the multi-point Pseudo Excitation Method model, and then the simulation result was gained by ANSYS. First,a detailed multi-body dynamic model of the vehicle was established by using ADAMS/VIEW software package; secondly, a stochastic controller was designed for active suspension system and worked out by means of Matlab/Simulink, the proposed control algorithm was integrated with the multi-body dynamic vehicle model and the coupling system simulations could be performed repeatedly until a satisfactory controller was achieved, the system was compared with a conventional passive one. Simulation results showed that the proposed active suspension considerably improved both the ride and handling performance of the vehicle.
Performance-Based Seismic Design of Long-Span Railway Arch Bridge
Authors: Shao Chang Jiang , Yang Hua Ping , Qian Yong Jiu
Published: June 2012

New requirement is claimed for the seismic design method of long-span railway bridges with the rapid development of high-speed railway construction in China during the last decade. However, the present design code of our country seems not keep pace with the engineering practice. The existing method, although embodying the philosophy of performance-based earthquake resistance design framework, in ‘the seismic design code of railway engineering’ is only applicable to those girder bridges with spans smaller than 150m. Therefore, the authors introduce the anti-seismic design measures of highway bridges from the Current China Specification to check the seismic safety of a long-span railway arch bridge as an applying example. Different seismic fortification criterions and property objects of the structural system and components are supplied in order to optimize the anti-seism performance of this bridge. The numerical results show that this kind of approach is helpful to improve the dynamical properties and seismic performances of large span railway bridges.
Comparative Study on the Vertical Dynamic Responses of Simply Supported Beam Subjected to Two Typical Vehicle Models
Authors: Shan Chun Sheng , Ye Wei , Li Heng , Li Xiao Zhen
Published: June 2012

A novel simplified vehicle model i.e. arbitrary moving mass-spring systems model, which can be simplified into moving loads model, is put forward and proved to be capable of analyzing the vertical dynamic responses of bernoulli-euler beam. Based on the matlab platform, a simply supported beam with a span of 40 m serviced in Beijing-Shanghai High-speed Railway is selected as the case study. The similarities and differences of vertical dynamic responses of the bridge based on this two vehicle models are compared. On this basis, the effects of vehicle speed and bridge damping ratio on the bridge’s dynamic magnification factor is studied. The computation results show that this new vehicle model is effective and reliable in its practical application.
Automatic Identification of Fundamental Frequency for Tied Arch Bridge Suspender Tension Monitoring
Authors: Li Yi , Xiang Yi Qiang , Chen Bao Chun
Published: June 2012

For the reliable assessment of bridge health and safety conditions, it is crucial to identify fundamental frequencies of suspender real time and automatically from random vibration signal that is weak and interfered with noise when suspender tension is measured online by frequency method. According to the characteristics of vibration signal spectrum, auto-power spectrum combined with autocorrelation function method which result was periodic distribution of spectral information in frequency domain. Plus from the spectrum the resonant peak of suspender was highlighted to reduce the noise disturbance which helped identify fundamental frequency and improved identification effect and result precision. In addition a field experiment in a tied arch bridge was carried out to analyze the collected vibration data. The practical application shows that this kind of measurement method is feasible and useful.
Based on ANSYS the Application of Virtual Crack Close Technique in the Calculation of Strain Energy Release Rate in Interface Crack
Authors: Cheng Chen , Wan Shui
Published: June 2012

Computation of the energy release rate, based on the FEA software ANSYS, with the virtual crack close technique, is studied. To reduce post-processing workload, the spring element is imposed at the cracktip. In practical applications, COMBIN14 spring elements are adopted to set up the finite element model. Then, the numerical analysis method is applied in interface crack. But the calculaed strain energy release rates are pseudo values, and only the total strain energy release rate convergences. At last, two numerical experiments are presented to validate this method. The results show that the calculated values of the total strain energy release rate are well with the theoretical values. This numerical analysis method is an efficient and accurate numerical analysis method.
Study on the Influencing Factors of the Durability of Urban Reinforced Concrete Bridges in Hebei Province
Authors: Bi Quan Chao , Zhu Shou Qin , Cui Hong Huan
Published: June 2012

As one of the important traffic facilities in cities, reinforced concrete bridges provide necessary services for the traffic in cities, but bridges that have been built in cities do not meet the requirements in durability aspect. We conduct a study about the durability of urban concrete bridges in Hebei province by this paper,analyse influencing factors of the durability of urban reinforced concrete bridges,provide measures and suggestions for the design and construction of bridges.
Research on Structure Design of Cable-Stayed Bridge
Authors: Li Xi , Cai Ting Ting
Published: June 2012

Bridge is a kind of structure that is common in our daily life, it connect both sides of rivers, lakes, and even channels, also sometimes it is used to solve transportation problem, just like overpasses. Cable-Stayed Bridge because of its special advantages (large-span with fewer piers) is playing an increasingly important role now. In this work we made some research on structure design of Cable-Stayed Bridge, static analysis, dynamic analysis and Construction of the structure was proposed.
Phasing Sequence and Signal Spacing Based Progression Bandwidth Optimization Technique
Authors: Zhao Yi , Tian Zong
Published: June 2012

This study provided quantitative analyses about the influence of phasing sequences and the impact of intersection spacing. A large number of signal system scenarios were randomly generated to represent the real-world traffic systems. Based on simulation result, it was concluded that Leading and Lagging left turn phasing were more likely to be involved in progression bandwidth solution of signal systems with randomly distributed spacing. And the number of signals has significant impact on bandwidth attainability. Further conclusions were drawn from the fitting curve that it is impossible to obtain any two-way bandwidth solutions when more than 16 signals were involved in the system.
Study on Vehicle Speed in Pore Water Pressure of Rigid Pavement Base Using Poro-Elasticity
Authors: Li Hai Bin , Sheng Yan Ping
Published: June 2012

Water in pavement is a major contributor to pavement failure. Fine aggregates are pumped out near the joint of rigid pavement and cause the erosion of the base layer. In order to analyze the phenomenon, a two dimensional model using Finite Element Method (FEM) and Porous elasticity theory is developed to calculate the pore water pressure development in the base layer underneath joints. The model contains three parts, two cement concrete surface plates separated by a joint gap and a base layer with relatively small stiffness and large permeability. The constitutive behavior of porous medium material used in the model is introduced. Nodes along the depth direction of the base layer underneath the joint are analyzed to investigate the erosion of the base. Distributed loading is applied at the part area near the joint to simulate vehicle passing through the rigid pavement surface. Excess pore water pressure along the depth caused by external loading are calculated. The influence of vehicle speed on the base material is analyzed by adding a tire contacting with surface of the cement concrete. The results of the study show that vehicle speed does not only influence the magnitude but also the dissipation of the pore water pressure.
Research on the Service Mode of Tele-Taxi
Authors: Yao Xin Sheng , Cui Yan , Qu Jian Hua , Zhang Cai Xia
Published: June 2012

With the development of society and economy, taxi service requirement is increasing, but the taxi traditional operation mode depending on chance has the obvious shortage, such as vehicle low efficiency, low customer service level, high empty driving rate, high fuel consumption, which already became an urgent problem to be solved for taxi management department. By the technology integration of the vehicle location, in-vehicle equipment, communication network and data platform, the Tele-taxi mode can realize the information linking and business coordination between the passengers and taxis.
Location of Logistic Distribution Center Supported by ArcGIS
Authors: Yang Yan Zhen
Published: June 2012

Based on GIS technology, location of logistic distribution center is realized. More factors, which effect the location of logistic distribution center, such as terrain, land use type, area etc., have been considered. Moreover, as an example, a case is given in the paper. In the case, the process of location of logistic distribution center has been realized based on ArcGIS. The results show that the location of logistic distribution center by using GIS technology is more intuitive and scientific than traditional method, and can provide the more scientific basis for relational work of logistic enterprise.
Mobile Information System for Sustainable Project Management
Authors: Fathi Mohamad Syazli , Rawai Norshakila , Abedi Mohammad
Published: June 2012

The construction industry is an information-based industry, the progression of which requires the most effective and efficient tools in management, more specifically in managing the information flow between project team members. These tools become essential to a project management team dealing with the complexity and changing needs in the construction industries. Advances in information and communication technologies (ICT), especially mobile phones, offer an alternative way to overcome the limitation on effective collaboration in construction projects. A review of previous research, case studies and also technology reports shows how mobile information technology has the potential to provide improvements in construction communication and information collaboration. This paper discusses the implications of mobile information systems in sustainable project management. The findings show that there is a high potential for improving sustainability projects, the effects on construction resources and the potential impact of improving sustainable project management in construction industries.
Multi-Scenarios Vehicle Traces Modeling in Co-Simulation of Vehicular Ad-Hoc Networks
Authors: Wang Jiang Feng , Nie Shuo , Yan Xue Dong , Xiang Wang
Published: June 2012

Vehicular ad hoc networks (VANETs) form when vehicles are equipped with devices capable of short-range wireless communication. Realistic vehicle trace modeling for VANETs simulations is a challenging task, which requires the reliable characterization of vehicular mobility. In this study, three different vehicle scenarios are proposed to analyze the difference between vehicle traces in multi-scenarios: city road, expressway and highway. Common trace modeling tools and characters of the scenarios are explored. Furthermore, three experimental scenarios are established using VanetMobiSim to produce vehicle traces. The experimental results show that the trend of the average speed versus the number of vehicles is different, and the vehicular density distribution demonstrates the realism of vehicle trace under multi-scenarios.
Hierarchical Regression Model for Analyzing Truck Freight Demand
Authors: Wang Hui Li , Shi Zhong Ke
Published: June 2012

Trucks play a significant role in transporting freight through the ground transportation systems, and it is important to be able to estimate and predict the amount of freight in a highway network. In this study, truck weight and volume data, obtained from Weigh-in-Motion stations in California, are analyzed to examine temporal and seasonal patterns. Then coupled with socio- economic variables, a hierarchical regression model is established for estimating freight demand. The model reveals that truck freight demand can be estimated by the truck annual average daily traffic along with the population, number of firms and median income at that county level. What is more, it has a predicting capability of freight weight where no truck weight data is measured. Therefore it can be served for practitioners to predict the growth of freight demand in a freeway network, and is useful to achieve the optimal flows design of cargo at all segments, regardless of whether or not weight data is available.
Discussion on Indoor Formaldehyde Treatment
Authors: Xia Chun Feng
Published: June 2012

The paper summarizes the major indoor air formaldehyde pollution sources and major pollutants, introduces the harm of indoor formaldehyde, the interior decoration, decoration, and so brought about by the invisible pollution day and night against the people's health, briefly introduces several method of reducing indoor formaldehyde concentration and analyzing advantages and disadvantages to the different treatment methods.
An Evaluation Method for the Estimated Travel Speed and Travel Time by Taxi Floating Car Data
Authors: Fu Hai Wei , Qu Lin Chi
Published: June 2012

Floating car data (FCD, also called probe vehicle, PV) system is a new and based on a certain percentage of all vehicles in the traffic which are equipped with a location and data communication device transmitting experienced traffic flow parameters to a traffic information center. Then the link travel status can be estimated using these large sample dada. In this paper, an evaluation and analysis method for FCD system in Ningbo was introduced. Firstly, a mathematical statistical method is used to compute the minimum probe vehicles number on one segmental road. Then, the original GPS data was analyzed on several aspects, including PV-GPS data coverage and average probe vehicle number of covered links. Based on the minimum probe vehicles number, we can evaluate overall quality of FCD system and improve it accordingly. Finally, the obtained traffic state information was validated with test drives of independent vehicles driving on a long loop route with many intersections. A valuable conclusion is obtained, and would be a valuable basis for developing FCD system in the further work.
Application of Particle Damping in Vibration and Noise Isolation of Drum Brake
Authors: Xia Zhao Wang , Qin Jian Wei , Pan Hong Ren
Published: June 2012

Particle damper comprises granular particle enclosed in a container within a vibrating structure. It may be applied in extreme temperature environments where most conventional dampers would fail. In this paper, the feasibility of an application of particle damping to the noise and vibration control of a drum brake is analyzed. A coupling simulation algorithm based on the discrete element method and finite element method is presented. This method makes it possible to consider parameters of particle damper such as the particle size, ratio and particle material and so on. The validity of this numerical method is examined by a comparison of the experimental results. And the results show that the presented particle damping is effective and the analyses of dynamic feature of a drum brake with particle dampers are reasonable.
Research on a New Type of Elevator Safety Catch
Authors: Zhang Zi Yi , Tan Miao Miao , Tian Hong Yu , Duan Kai Lu
Published: June 2012

Safety Catch device is the most important mechanism in an elevator. It provides safety protection in case that driving cable of an elevator suddenly breaks. A new type of Safety Catch mechanism with simple structure is provided in this research. When driving device of an elevator failed to function, safety catch device acts automatically, this will prevent elevator cabin from falling down. To compare with conventional ones, this new type safety catch device has the feature of lower impact and simple in structure. In this paper, structure of this new type of safety catch device is detailed; design and related calculation are discussed.
Airside Pressure Drop Mechanism of Automobile Air-Conditioner Evaporator Plating with Hydrophilic Film
Authors: Ouyang Qin
Published: June 2012

A mathematical model of airside pressure drop was established, and calculations were conducted respectively under dry condition and wet condition for evaporators with hydrophilic treatment and without hydrophilic treatment. Experimental results demonstrate the proposed model. The results reveal a significant improvement of hydrophilic treatment, and air resistance drops to 53% when relative humidity is 50%, while it drops to 50% when relative humidity is 90%.
A Heuristic Algorithm for Solving Crew Rostering Problem
Authors: Zhao Ming Yu , Wang Zhen Yu , Liu Qiong
Published: June 2012

Crew rostering is one of the most important scheduling problems for large airlines. In this study, a LP resolving algorithm in the B&B tree context and a heuristic for the IP solution of the crew rostering problem were proposed. The efficiency mainly comes from the special structure of the crew rostering problem. The computational experiments on the real-world problems showed that the time of the proposed resolving algorithm doesn't exceed 30% of that solves from scratch although the problem has largely changed, and the heuristic for the IP solution can rapidly get a sufficiently good scheme for all crew.
Effects of Eco-Driving on Driving Performance
Authors: Yang Xiao Yu , Li Dan , Zheng Peng Jun
Published: June 2012

This paper investigates the effects of two driving behaviors on driving performance, the driving with eco-driving support and the general driving. Through observing and analyzing these driving behaviors in a variety of situations, driving performance under conditions of with and without eco-driving was evaluated. Based on the measurements on fuel consumption, speed control and gear use, it was found that eco-driving device can guide drivers to take proper driving behavior, such as in which way to drive and how to drive in order to achieve energy saving. The paper revealed the effects of eco-driving and how to drive efficiently.
Study on Detailed Mass Estimation of Aircraft
Authors: Chen Xiao Jie
Published: June 2012

The Aircraft mass estimation and the associated 'balancing' of the layout are two of the main decision areas in the project phase of the design. The initial crude 'guesstimates' at the aircraft take-off weight will be progressively refined as more details of the aircraft configuration and systems are settled. How the mass estimation process is progressed and how details of the configuration and systems are related to the total aircraft mass is discussed. After an initial explanation of the factors which affect mass, a simplified method to determine the first estimate of aircraft take-off mass is presented together with an example calculation. A more detailed mass estimation method is then described together with formulae and expressions to predict each of the main components of the aircraft. After this, the items is list in a standardized mass statement for the aircraft. The form of this list is described and the various sub-groupings is shown.
Performance of Urban Rainwater Retention by Green Roof: A Case Study of Jinan
Authors: Ma Liang , Qin Bing , Zuo Chang Qing
Published: June 2012

Green roof can significantly reduce runoff volume and delay the duration of rainwater compared to a conventional roof; however there is insufficient research in China regarding rainwater retention performance. In this research, a comparison of a green roof with a conventional roof on rainwater retention is quantified. Results suggest that the specified sedum green roof delays the start and end time of runoff for 3 –13 and 4 –8 minutes. Artificial rainfall runoff retention ranged from 52.86% to 71% for the green roof. On the retention efficiency, potential 3141.77 ×104m3rainwater could be retained by urban green roof in Jinan. The green roof is demonstrated an optional measure to reduce the quantity of rainwater entering already overburdened city drainage systems with great huge economic and environmental benefits.
The Study on Public Motivation Policies Concerning Construction of Urban Ecological Environmental Infrastructure
Authors: Cui Jing Hua , Li Hao Yan
Published: June 2012

With the rapid improvement of urbanization and the acceleration of urban-rural integration, environmental problems in China call for urgent actions. One of the important factors of non-effective treatment of Chinese urban pollution is due to the lagging of construction of urban environmental infrastructure. By analysis, this paper concludes that the limited number of investment entities, rare amount of capital investment and poor investment effectiveness account for the slow pace of construction of urban environmental infrastructure in China. Considering this, the government should allocate a larger share of fiscal capital investment, adopt preferential taxation policy and green financial policy, and perform public-private cooperation to smoothen the construction of urban environmental infrastructure.
Optimization Design of Courtyard Sunspace Passive Solar House
Authors: Chen Ming Dong
Published: June 2012

Courtyard sunspace passive solar house is designed according to architecture structure characteristics of rural courtyard, which is a composite of direct absorption, collected wall and attached greenhouse solar house. Architectural optimization design is carried out in order to improve energy saving effect of courtyard sunspace passive solar house, and evaluation standard of thermal performance test and energy consumption of building test is determined to analyze indoor thermal environment of courtyard sunspace passive solar house. It will provide theoretical foundation to construct courtyard sunspace passive solar house in rural area.
Microwave-Assisted Zeolite Hydrothermal Synthesis from Coal Fly Ash and its Application
Authors: Cui Hong Mei , Ke Ling Fei , Li Fang , Kang Ti
Published: June 2012

Zeolite from coal fly ash is hydrothermal synthesis by microwave-assisted, and it is used to process wastewater. Through the XRD analysis, we discovered that many kinds of zeolites were synthesized in the experiment. The influence factor of zeolite sythesis is chemical composition, activator, temperature, time,etc. This kind of zeolite is used in processing wastewater, removed some positive ions from wastewater, like NH4+,Cu2+,Fe2+,Mn2+,and so on. Meanwhile some PO43+ and CODCr were removed. The main principle of zeolite processing wastewater is cation exchanging. There are physical-chemistry adsorption and the chemical precipitation in this process.
Health Risk Assessment of Wastewater with Carbinol in Gas Field
Authors: Jin Peng Kang , Ning Xing Wang , Jin Xin , Wang Xian Bao
Published: June 2012

The carbinol in wastewater from inhalation and direct contact present more risk to human health, as well as cause hazard to ecological environment through waste water emission directly and soil infiltration. In this paper, health risk assessment of wastewater with carbinol in gas field is performed using mathematical models of non-carcinogenic health risk assessment. The results show that the non-carcinogenic health risks caused by wastewater with carbinol are in the range of 6.33×10-5 to 9.20×10-5, which are much higher than the acceptable risk level 7.00×10-5. Through the calculation of the threshold of the carbinol concentration in the wastewater, the carbinol concentration in the wastewater is less than 24500mg/L, not on human body risks. However, the carbinol concentration in the wastewater is much than 24500mg/L, it is a health risk to human body, which provides the scientific basis for the prevention and mitigation of wastewater with carbinol health risks.
Treatment of Wastewater Containing Disused Extractant by Advanced Oxidation Processes
Authors: Xiang Ying Hong , Song Jun Ke , Li Xiang Dong , Wang Jing
Published: June 2012

The spent fuel can be treated by solvent extraction. In the process of extraction, the performance of the extraction will be serious deterioration by the effect of radioactive radiation, chemical reaction, light and heat, it will be a new waste and harm human being and pollute environment seriously. In this paper, four different advanced oxidation processes (UV/H2O2,UV/Fenton,O3 and O3/Fenton)were used to treat the wastewater containing extractant. All of these four methods, at presumed conditions, could result in high COD removal efficiencies, and the removal rate of COD reached 80% or above when the wastewater was treated 3 hours.When the wastewater was treated by pretreatment/O3/Fenton, the COD and removal efficiency of the effluent were 247mg/L,94.5% respectively, at the O3 dose of 1000 mg/L with 72 ml/L H2O2.
Optimizing the Step-Feed Ratio and Modeling the Effluents of Aerobic Tank with ASM1 in ECOSUNIDE Process
Authors: Li Ruo Gu , Zhang Yan Qiu
Published: June 2012

The step feed model based on the Activated Sludge Model No.1 (ASM1) and the optimum model of the ammonia nitrogen (SNH) removal in wastewater were established. Four aeration tanks under the different step feed ratios were simulated by Matlab Simulink. The results show that single-feeding is conducive to the removal of readily biodegradable substrate (SS) and the growth of heterotrophic organisms (XBH), and to lower the biodegradable substrate (XS) at the same time. The SS, XS, and SNH concentrations are 1.36, 5.98, and 3.02 mg/L respectively in effluent. However, the step-feeding is conducive to the SNH removal, and the autotrophic bacteria (XBA) growth. Under the step feed ratio (25/25/25/25%), the SS, XS, and SNH concentrations are 2.64, 10.79, and 2.61 mg/L respectively. Under the optimum ratio (28.7/23.6/20.4/27.2%), step-feeding could further facilitate the removal of SNH and hinder the removal of organic matter, their concentrations are 2.70, 10.98, and 2.47 mg/L respectively.
Research on Removal of SiO2 from Heavy Oil Wastewater
Authors: Xu Jing Li , Liang Li , Wang Jun , Xu Yian , Luo Li Xin
Published: June 2012

For heavy oil wastewater from Henan oilfield, removal of silica has been investigated under the condition of different flocculants and reaction time when magnesia has been used as a desilica agent. An optimum method has been determined by conditional experiments, 63% of silica could be removed.
Synthesis of HS/NH2-Bi-Functional Mesoporous Silica and its Adsorption of Co(II) and Mn(II) in Dilute Solutions
Authors: Yao Qing Xu , Jia Ming Chun , Men Jin Feng
Published: June 2012

Bi-functional mesoporsous silica adsorbents, functionalized via the introduction of chelating agents (mercaptopropyl and aminopropyl groups) were prepared to adsorb Co2+ and Mn2+ in dilute solutions. The molar ratio of MPTMS/APTMS in grafting process seemed to have great effected on the mesostructure of adsorbents, and the appropriate value was considered to be 2/1. The modified silica gels at that ratio showed well-ordered property as well as its high infinity of the two metal ions. The pseudo-second-order equation was applied to describe the adsorption kinetics. And the influence of interferential ions Ca2+ and Mg2+ was also studied.
Detection of COD in the Wastewater Treatment Process Based on Fluorescence Excitation-Emission Matrix Spectrometry
Authors: Du Shu Xin , Wu Yuan Qing , Yuan Zhi Bao
Published: June 2012

In the wastewater treatment process, it is necessary to detect the concentrations of organic matter in order to monitor the operation and adjust the process parameters. Based on fluorescence excitation-emission matrix spectrometry, Chemical oxygen demand (COD) of effluent wastewater in the primary sedimentation tank, the secondary sedimentation tank and the final sedimentation tank of Hengdian Wastewater Treatment Plant, Zhejiang Province, is detected respectively based on fluorescence excitation-emission matrix spectrometry. In order to compare the modeling performance, principal component regression (PCR), partial least squares (PLS), parallel factor analysis (PARAFAC) and multi-way partial least squares (N-PLS) are respectively used to build the calibration models between the fluorescence spectrometry and COD. Experimental results show PLS is better than PARAFAC and N-PLS in the aspect of modeling performance for detecting COD in the wastewater.
The Study of Hospital Wastewater Treatment by Combined Pure-Oxygen Aeration and A/O Process
Authors: Yu Wei Wei , Zhang Zhi , Chen Shi Ling , Wang Tao , Zhang Teng Can
Published: June 2012

The field in which pure oxygen aeration is applied to sewage treatment is extensive. In actual application it is more suitable for the degradation of industrial sewage. Pure oxygen aeration has unique merit compared with common air aeration. This article introduced the effect by pure oxygen aeration. The study shows pure oxygen aeration is an effective pollutant removal mechanism, and at the same time proposes the best dissolved oxygen is at 3 mg/l. The average removal rates of CODcr, NH3-N, TN are 73%, 50%, 55% respectively. The conclusion is that pure oxygen aeration for hospital wastewater the CODcr removing rate is higher than ammonia nitrogen and total nitrogen efficiency.
Surface Modified Magnetic Silica Particles for the Immobilization of Laccase and its Use for Pentachlorophenol Removal in Water
Authors: Wang Ying , Zhang Di , Li Xue , Li Bo
Published: June 2012

Magnetic Cu2+-chelated silica particles using polyacrylamide (PAM) as a metal-chelating ligand were developed and used for the immobilization of laccase by coordination. The particles were characterized by (XRD). The effect of Cu2+ and PAM concentrations on the enzymatic activity and the catalytic capacity for pentachlorophenol (PCP) degradation were evaluated. The results showed that the optimum Cu2+ and PAM concentrations were 0.2 mol/L and 2 g/L, respectively. The immobilized laccase prepared in this work exhibited a good catalytic capacity for PCP removal from aqueous solutions.
Comparative Studies on Solar Combisystem by Different Auxiliary Heat Sources
Authors: Yan Qiu Hui , Li Ning
Published: June 2012

This paper proposes a solar combisystem model with biomass boiler as its auxiliary heat source. Taking specific constructions of towns into consideration, solar combisystems with four different auxiliary heat sources——gas boiler, electric boiler, coal boiler and biomass boiler are compared from the aspects of comprehensive energy price, CO2 emissions and social benefits. The results show that, compared with the solar combisystems with conventional energy boilers as their auxiliary heat sources, the system with biomass boiler as its auxiliary heat source has favorable economic, social and environmental benefits.