bluuebunny/crossref_metadata_2025 huggingface dataset:
Cross-Directional Basis Weight Measure and Control System Based on CARMA Model Predictive Function Control Algorithm
Authors: Xiao Zhong Jun , Liu Xing Ping , Hou Bao Xia
Published: November 2012

According to the analysis of papermaking process, combined with the principle of cross-directional basis weight(BW) detecting and controlling, predictive function control based on CARMA(Controlled Auto Return Integral Moving Average Model) model is proposed to solve the problem of time delay, nonlinearity and uncertainty of the multi-dimension system. Simulations show that multivariable predictive functional control algorithm for fast tracking velocity, good dynamic performance, and it can effectively reduce the mutual coupling effects between variables. The method has the feasibility of applying to practical papermaking process.
Vacuum Brazing of Inconel 718 to Waspaloy Superalloy Using BNi2 Brazing Filler
Authors: Yu Zhi Shui , Li Rui Feng , Shi Kun
Published: November 2012

Inconel 718 and Waspaloy superalloy was vacuum brazed using BNi2 filler. The effect of joint clearance and brazing temperature on the interfacial microstructure, element and microhardness distribution were studied systematically. The microstructure of the brazed joints is both mainly solid solution when the brazing clearance is 30μm at 1080 °C and 100μm at 1140 °C. The results show that the elements diffusion of nickel based filler is more active with the decrease of the joint clearance and increase of brazing temperature. The peak of microhardness is shown at the centerline of brazing seam.
Using TRIZ-Based Conflicts-Solving Approaches for Product Life Management (PLM) of Innovative 3C Consuming Product
Authors: Yeh Chi Hao , Wu Ful Chiang , Wang Ming Jaan
Published: November 2012

The aim of this paper is to show how to apply TRIZ to resolve conflicts in management area, especially in product life management (PLM) in desinging and manfacturing smart-phone. TRIZ has been well-known as a creative and innovative thinking theory in solving engineering and technology contradictions in the last two decades. However, few studies and practical usage were proposed in management area. Conflicts occurring in product life management including schedule, budget, and risk ones at smart phone R&D process are discussed to demonstrate the ideas guided by 39 TRIZ management parameters, 40 TRIZ innovative principles, and contradiction matrix. The results show that TRIZ is able to provide direct, quick and effective alternatives to resolve the conflicts in PLM. In this manner, huge effort and cost can be saved in further project execution stage. In this paper, an innovative 3C consuming product such as smart-phone is utilized as a case study to describe the proposed TRIZ-based conflicts-solving approaches at PLM stage.
Effects of Nano-Particles on Properties of Electronic Solders
Authors: Du Chang Hua , Tang Ming , Gan Gui Sheng , Wang Tao , Huang Wen Chao , Cao Ming Ming , Li Chun Tian
Published: November 2012

It is analyzed that the mechanisms of nano-particles impact on melting temperature, wet ability, and mechanical properties of electronic solders, based on the characteristics of nano-particles, the crystal lattice structure and the interaction between particles and the matrix. The results indicates that if the interface between nano-particles and the matrix is low-energy state, it increases melting temperature of composite solders on ignoring the dissolution of nano-particles, conversely, the high-energy state reduces it. When nano-particles form appropriate frame structure in the liquid solder, the emergence of capillary adsorption can enhance the wettability, the strengthening mechanisms of nano-particles on solder include the Phase II enhancement, grain boundary strengthening and solid-solution strengthening. During the brazing process, nano-particles hinder the diffusion of atoms and reduce the dissolution rate of base materials in liquid solders, to inhibit the growth of the intermetallic compounds (IMC) of interface, thereby enhancing the strength and reliability of joints.
Research on Pricing Strategy of the Closed-Loop Supply Chain in Heterogeneous Market
Authors: Jiang Hong Wei
Published: November 2012

This paper constructs a closed-loop supply chain system with the manufacturer recycling waste products from the retailer based on game theory in heterogeneous market in which the price of the new product is different from that of the remanufactured product. The optimal pricing decisions of the supply chain without remanufacturing and the closed-loop supply chain with remanufacturing are obtained. Through theoretical analysis and numerical simulation, we obtain the optimum production and pricing strategies, and analyze the impact of the consumers’ acceptance for the remanufactured product on product pricing, which provides a basis for the closed-loop supply chain’s production decisions.
Ontology Modeling of Aircraft Fault Knowledge
Authors: Zhou Yang , Zeng Zhao Yang , Tian Bin , Jia Zhi Yu , Guo Xiao
Published: November 2012

With consideration of the actual requirement of fault knowledge management in current aviation maintenance, ontology-based knowledge representation method of aircraft fault is studied. Knowledge sources of aircraft fault ontology are analyzed based on ontology modeling primitives. Ontology construction method of aircraft fault knowledge is proposed learning from software engineering and the essence of the existing ontology construction methodology. On the basis of the above study, aircraft fault ontology which is consist of Fault Core sub-ontology, Product domain sub-ontology, Case domain sub-ontology, and Diagnosis domain sub-ontology is build, and it represents aircraft fault knowledge completely and consistently, and also lays the foundation for knowledge management of aircraft fault.
Research on Manufacturing Process Planning Based Double Main Spindles of Chuck for Mill-Turn Machine
Authors: Yao Zhuang , Yu Dong , Tian Jun Feng , Hu Yi , Li Qing
Published: November 2012

This paper provided the manufacturing process planning method of the double main spindles for the turn-mill machine based on model volume. Firstly, the cross section information of the 3D grid data model was obtained by using the algorithms of extracting partitions plane information. Secondly, differentiated the cross section shape to recognize the milling and turning process according to extracting partitions plane information. Then, it computed the treated volume in order to obtain equal division plane by extracting partitions plane information. According to readjusting the equal division plane defined the process machining boundary. The boundary divided the complex process workpiece into main and sub spindle process for the double spindles. At last, the machining experiment verifies the adaptability and accuracy of the process planning method.
Research of Kinematics Simulation of TBM Segment Erector Based on Virtual Prototype
Authors: Li Gang , Zhu Li Da , Yang Jian Yu , Wang Wan Shan
Published: November 2012

In order to solve the problems such as more restriction conditions, complicated interference and longer design periods in the design process of segment erector for Tunnel Boring Machine, it is necessary to study on the kinematics simulation of TBM segment erector. First of all, the kinematics characteristics of segment erector are analyzed; the 3-D model is designed in Pro/E environment; the model is imported into ADAMS and the dynamic simulation is finished finally. After the analysis of simulation of this mechanism, the curves of the speed for the driving parts are obtained and the maximum speeds of driving parts are identified with the method of space search technology. The kinematics characteristics of TBM segment erector are obtained. The simulation results provide an important reference for the mechanism design and type selection design for the power system and design cycle is shortened for TBM segment erector.
Influence of Welding Sequence on the Welding Residual Distortion for Laser Welded Sandwich Structures Used in Shipbuilding Industry
Authors: Chen Shu Ling , Yang Song Lin
Published: November 2012

Based on the classical theory of welding structure, the welding residual distortion for laser welded sandwich structure was simulated using finite element method(FEM). The results showed that welding front all and then to back may lead to a relatively high welding residual distortion. The maximum distortion in Z-direction is higher than 0.5mm. The distortion can be obviously decreased when the welding sequence is welded from front to back and then back to front alternatively. The maximum distortion in Z-direction is less than 0.1 mm.
Adaptive Regulation of Tracking Servo for Next Generation Optical Data Storage Systems
Authors: Peng Fei , Wu Zhi Zheng , Wang Lu
Published: November 2012

The tracking servo control has played an important role in the data storage servo systems. In the next generation optical data storage systems, i.e. the near-field recording system, the tracking error of the servo system should be below 10 nanometers under various unknown situations. However, higher data transfer rate and higher data density make it difficult to maintain the desired tracking precision during normal disk operation. It is proposed in this paper to use an adaptive regulation approach to maintain the tracking error below its desired value, despite unknown track eccentricity and external force disturbance. The performance of the proposed control approach is analyzed and simulation results are presented to illustrate the capability of the proposed adaptive regulator to achieve and maintain the desired tracking precision.
Research on Remote Virtual Assembly Technology of Plug Valve Based on VRML
Authors: Jiao Pei Gang
Published: November 2012

In this paper, three-dimensional plug valve was created. The function of virtual assembly was achieved using virtual reality modeling language. Network virtual assembly can operate, browse and assemble plug valve remotely by embedding virtual assembly in web pages. The virtual assembly method presented in this paper can be easily extended to deal with many other problems in complex engineering system if control parameters are modified properly.
The Data Fusion of Chess-Playing Robot Based on SERCOS
Authors: He Ji Lin , Li Dong
Published: November 2012

This paper presents a data fusion system of chess-playing robot based on SERCOS. Owing to the environment of Windows NT + RTX, especially the SERCOS bus interface card, the control system is excellent in real-time property, more importantly, the highly efficiency of data fusion and image processing is guaranteed and therefore the good interaction between people and robot is ensured.
Image Surface Defects Extraction Technology Based on Watershed Segmentation and Texture Analysis
Authors: Zhu Zheng Tao , Yang Gang , Zhang Bo
Published: November 2012

Images of glass product that are captured under poor light usually make defected regions covered by dark pixels because of refraction and scattering brought about by defects on glass. On the other hand, image texture makes it unlikely to effectively identify defects accompanied by some texture by using commonly-used image segmentation and defects extraction algorithms. Watershed segmentation algorithm is proposed in this paper to extract catchment basin where defects characteristics in each image region will be calculated with the twofold application of gray level co-occurrence matrix(GLCM) and parameters characteristics . Defects will be finally identified using shape operator.
Structural Damage Identification Based on Acceleration Response Vibration Transmissibility
Authors: Diao Yan Song , Zhang Qi Liang , Meng Dong Mei
Published: November 2012

When the frequency response function (FRF) and Back-propagation (BP) neural network are used to identify the structural damage, problems such as the excitation information can not be got easily, the network is difficult to converge and the network stability is poor as the oversize input vectors. So, in this paper, two node acceleration responses of the structure under the white noise are directly used to construct the vibration transmissibility, and principal component analysis (PCA) is pursued to the amplitude of the vibration transmissibility for dimensionality reduction. The combinations of principal component variation before and after damage are used as the damage characteristic vectors, and which are input into the BP neural network for damage identification, the influences of the different degrees of noise during the damage identification are considered simultaneously. The results of numerical simulation and model experiment of offshore platform show that the method can identify the different degrees of structural damage.
A Study on Objects Information Compatibility between BIM Softwares for Building Thermal Load Analysis
Authors: No Sang Tae , Hong Seung Hun , Kim Jae Yeob
Published: November 2012

The objective of this study is to investigate the file exchange compatibility of BIM based building energy simulation tools, especially focusing on various irregular building geometry shapes. As a base building modeling software, AUTOCAD Revit was selected and various building geometry shapes were created using Revit, such as curved and pitched walls, roofs, slabs with various air-conditioning zones. And these various shaped building zones were imported to ECOTECT, IES/VE and Openstudio for EnergyPlus, which are professional building energy simulation tools. Through this create-import process, the deformation of building shapes, change of zone volume, and compatibility to each simulation engine were investigated and analyzed.
Recovery of Lead from Lead Oxide Ore from Kazakhstan by Gravity Separation Combined with Flotation
Authors: Zhao Wen Juan , Liu Dian Wen , Zhang Xiao Lin , Feng Qi Cheng , Song Kai Wei , Wen Ya , Mao Ying Bo
Published: November 2012

The test had been carried out on a lead oxide ore (18.57% Pb) from Kazakhstan, which had a high oxidation ratio (above 95%) and complexly intergrowed with plenty of alkaline gangue minerals such as calcite and dolomite. A joint flowsheet that combined the gravity separation with flotation was developed to recover the lead, during which flowsheet, a new effective slurry regulator was used. Compared with the joint flowsheet, the concentrates of the single gravity separation and the single flotation were achieved with a lower Pb recovery of 53.80% and 56.06%, and the Pb grade of 62.00% and 66.28%, respectively. Finally, a concentrate by the joint flowsheet was obtained with a Pb recovery of 89.12% and a Pb grade of 58.90%. The tailing from the joint flowsheet had a low Pb grade of 1.59%, with a loss of 5.50% of Pb. The experimental results show that the joint flowsheet was better than the single flowsheet for this lead oxide ore, which greatly improves both the performance and economic benefit for the concentrator.
Research of the Interference of Surface Plasmon in an Enhanced Two-Slit Structure
Authors: Gao Yan Duan , Gang Song , Li Yu
Published: November 2012

A modified two-slit structure is provided to investigate surface plasmon (SP) interference. It’s based on a novel structure, implemented by adding a metal film on the input port of the T-shape slit. The affection of metal film for SP interference is investigated by simulation. Results show that the interference phenomenon can be more obvious with the metal film II than without it. With our structure, the added metal film can enhance transmission energy of SPs and improve interference effect. The results will give a theoretical guidance for development of nano-scale photonics devices.
Medical Auto-Injector Design
Authors: Hou Jie , Tang Jing Jun , Zuo Jun , Fan Wen Hui , Chen Shu Wang
Published: November 2012

A kind simple structure and convenient operation of automatic injector is designed in the paper. It can be placed on the desk with the friendly interface. Its core components are AT89C51 and stepping motor. SCM can be controlled by the corresponding key to send the logic control signal through software programming. In order to achieve the automatic injection function under different speeds at 20 ml, 30 ml and 50 ml liquid level, automatic injector is drove by the different statuses of stepping motor, such as open and stop, acceleration and deceleration, turning and reversal, etc. For driving stepping motor more better, the drive chip ULN2003 is used. The speed, the turning direction and the injection dose of stepping motor is displayed with LED. It realizes the well-proportioned injection, avoids the error caused by artificial operation and uncertainty, and reduces the pressure of the medical staff.
Effects of Architecture Design on Safety Level of Airborne Electronic Systems
Authors: Yan Fang
Published: November 2012

Safety level is the key input to the development process and assurance process of airborne electronic system, and is influenced by both the safety effect and the architecture used. The paper focuses on the determination of principle how the architectures influence the level assignment. The relationship between system safety objectives and assurance process was discussed; six architectures were studied in aspects of capability of common error limitation, and the concept of independence was introduced to characterize the architectures. The method to assign levels considering architectures influence was proposed using architecture independence concept, and a yaw damper system was studied for assurance level assignment to verify the principal.
Research on Customer Churn Model with Least Square Support Vector Machine
Authors: Xia Tai Wu
Published: November 2012

China telecommunications market is becoming more competitive, the operators are facing the severe costumer churn problem, and how to predict and effectively reduce the costumer churn directly concerns the survival and development of every operator. Therefore, the least squares support vector machine(LS-SVM) algorithm is adopted to build customer churn model, mainly including data cleaning, normalization, building forecasting model, model prediction, etc. The case study shows that the customer churn prediction using the LS-LSV has high precision, small error and remarkable effect.
Face Recognition Using Local Variation
Authors: Liu Jing Jing , Shen Wei Guo , Gao Quan Xue , Hao Xiu Juan
Published: November 2012

In this paper, a novel approach, namely local variation projection (LVP), is presented for face recognition. LVP defines an adjacency graph to model the variation among nearby face images, which includes the within-class variation and between-class variation, also called margin. In order to better detect the discriminant structure, we assign a small weight to the variation among nearby face images from the same class. Based on this content, a concise feature extraction criterion is built for dimensionality reduction. Experiments indicate the effectiveness of our proposed approach.
Pattern Synthesis of Circular Array Antenna by Improved Genetic Algorithm
Authors: Ren Gong Wei , Zhou Cheng Hua
Published: November 2012

Propose an application of multi-objective genetic algorithm (GA) for pattern synthesis of circular arrays with equally spaced isotropic elements. Aim at reduce the side-lobe level and deep the null of array antenna patterns, adopt improved real-coded genetic algorithm, which modify the crossover operator and mutation operator compare with standard GA, both the crossover and mutation probability adjustable in accordance with the generation numbers, in the final, the approach for antenna pattern synthesis can suppress interferences by deep the nulls at directions of interfering sources and placing main beam in direction of desired signal by controlling amplitude weights. Numerical results show effectiveness of the procedure proposed.
Design of a Novel Tag Antenna Mountable on the Side of Cigarette Carton
Authors: Cao Qian , Li Jian Xiong , Mao Lu Hong
Published: November 2012

The growing interest of Radio Frequency Identification (RFID) applications has seen problems emerging in the identification of object, especially those that contain conductive material. A low-cost novel tag antenna for a RFID tag which could be mounted on the side of cigarette carton is proposed in this paper. Since the cigarette carton contains conductive material, radiation properties of the antenna could be affected significantly. The specific parameters of the antenna were optimized based on the Finite Element Method (FEM). The performance of the tag antenna design affixed to the cigarette carton containing metallic foil is verified with read range measurements. The proposed antenna has a simulated bandwidth from 863 MHz to 943 MHz ( < -10 dB) for conjugate-matching with a commercial tag chip.
Design of a Robust Model Reference Adaptive Control System
Authors: Zhao Xiu Chun , Xu Guo Kai , Zhang Tao , Ge Ping Su
Published: November 2012

This paper addresses a robust adaptive control system based on Popov hyper-stability theory, which has strong robustness for the particular structure. Introducing the error between model and controlled object into adaptive controller, the system has accurate tracking capability and the convergence even in the presence of external disturbances and uncertainties. Simulations results are given to illustrate the effectiveness of the proposed robust adaptive control law in comparison with PID control.
Experimental Research on the Influence of Grain Size of Coarse Aggregate on Pebble Concrete Compressive Strength
Authors: Xie Wei , Jin Ya Nan , Li Shu Shan
Published: November 2012

To discuss the influence of coarse aggregate size, water cement ratio and ages on the concrete compressive strength，the compressive strength tests were carried out by 54 cubic specimens of pebbles concrete in dimensions of 150mm, 18 cubic specimens with dimensions of 200mm and 72 specimens with size of 150mm×150mm×300mm. The results show that the maximum size of coarse aggregate rises with the decrease of the concrete compressive strength; Concrete compressive strength of coarse aggregate size affects more apparently as the ratio of water-cement decrease; with the increasing of age, concrete compressive strength of the aggregate size effect has no significant changes.
Influence of Aggregate Gradation of Coarse Aggregates on Concrete Strength
Authors: Xie Wei , Yuan Deng Kui , Li Shu Shan
Published: November 2012

Concrete is widely used in engineering construction, and studying how to improve the strength of concrete is particularly important. The coarse aggregate is one of the elements in concrete, its property affects the strength of concrete prominently. The effect of coarse aggregate size distribution on the development process of concrete strength was studied, while keeping the constant content of coarse aggregate and altering the size distribution of coarse aggregate and the water to cement ratio. The experimental results show that when the maximum aggregate size is 10mm, 20mm and 30mm respectively, the compressive strength of concrete will be increased, and the flexural strength of concrete will be reduced.
Effect of Silica Fume on Workability and Water Impermeability of Concrete
Authors: Wang Fu Hua , Li Sen
Published: November 2012

A designed experimental study has been conducted to investigate the effect of silica fume on workability and water impermeability of concrete, a large number of experiments have been carried out in this study. The results indicate that the addition of silica fume has adverse effect on the workability of concrete composite. The slump and flowability of the concretes containing silica fume is less than that of the concrete without silica fume, and a considerable decrease for the slump and flow of the concrete was observed by increasing the dosage of silica fume. Besides, the addition of silica fume can improve the water impermeability of the concrete composite evidently, and the water impermeability is becoming better and better as the silica fume content is increasing gradually.
A Review of Stee-Polypropylene Hybrid Fiber Reinforced Concrete
Authors: Li Xiao Ke , Sun Li , Zhou Y.Y. , Zhao Shun Bo
Published: November 2012

The steel-polypropylene hybrid fiber reinforced concrete can take full advantages of macro-scale crack resistance and toughening effect on the concrete matrix of steel and polypropylene fibers. The shortcomings of concrete are improved and there is a wide prospect application in engineering. This paper summarizes the enhancement theories of hybrid fiber reinforced concrete to explain its strengthening mechanism. The research status is reviewed including mix proportion design, working performance of fresh concrete, mechanical behaviors, durability (impermeability, shrinkage and others), and engineering applications etc. Some further researches are forecasted. It would be very useful to apply and popularize steel-polypropylene hybrid fiber reinforced concrete.
3D Finite Element Analysis of Concrete Face Rockfill Dam
Authors: Zhang Jian Wei , Cheng Sheng Zhao , Yuan Shu Fang , Zhao Yu
Published: November 2012

Concrete face rockfill dam has the certain superiority in the construction of dam. Duncan-Chang nonlinear elastic model is selected as the dam materials in ABAQUS, which is an nonlinear finite element analysis software. Stresses and deformations of the concrete face rockfill dam are analyzed during its completion, operation and water level drawdown periods. Study shows that all results meet the requirements of the project, and have referenced value for other similar engineering.
Temperature Control of RCC Dam in Yongding Project
Authors: Xu Xiang Dong , Yue Jin Chao
Published: November 2012

Yongding RCC gravity dam with large project scale is in the construction all over the year, and the big temperature stress is a key factor for construction quality and progress. The temperature of the RCC dam in typical season with and without control conditions was analyzed by FEM, the temperature situation in typical season of RCC dam was controlled by the embedded cooling water pipes by practical method. Key points in concrete temperature control during high temperature season are found out, the counter measures and issues to be noticed are put forward.
S-Transform Analysis on Pulsating Water Pressure Acting on the Stop Log Gate
Authors: Huang Hu , Xu Xin Yong , Zhang Jian Wei
Published: November 2012

The vibration of sluice gate may lead to the damage of the hydraulic structure, based on the S-transform, the frequency and the phase distribution of the pulsating water pressure. The results show that as the water level increases, the frequency of the pulsating water pressure is small, the pulsating power acting on the bottom of the gate is decreasing, the components of frequency are rich, the power is wide, although the amplitude of frequency is decreasing, the whole power of pulsation is not changed; there is an obvious wave about the phase as the time changes, the phase distribution map is symmetry and periodically changes, and the velocity of wave may increase as the frequency increases.
Application of MIKE21 MODEL on Flood Routing in the Lower Yellow River from Gaocun to Sunkou
Authors: Zhang Xiao Lei , Guo Shao Lei
Published: November 2012

The 2-D water flow mathematical model based on MIKE 21 software which reflects flood routing in the reach from Gaocun to Sunkou has been developed in this paper. Through the numerical simulation of the “96.8” typical flood, the simulating results in the condition of present topography are agreement with the measured ones. It shows that this model is basically reasonable in the selection aspects of river terrain, boundary treatment, roughness and water flow parameters, and the model has a reference value for simulating flood routing in the Lower Yellow River.
Application of High Pressure Jet Grouting Technology in Seepage Prevention of ChuLou Reservoir
Authors: Zhang Shi Bao , Wen Jie
Published: November 2012

In view of the existing permeable sand layer and the leakage risk which threaten the earth dam foundation of Chulou reservoir, the high pressure jet grouting measure was applied to block leakage passage to solving the leakage problems of earth dam foundation. This paper mainly describes the high pressure jet grouting impermeable wall construction, including construction equipment, technological process, construction parameters and method, and wall quality detection. The test results show that the indexes such as wall depth, continuity, compressive strength, permeability coefficient meet the design requirements. The quality of impermeable wall is accepted.
Application of BOTDA in Mass Concrete Temperature Monitoring
Authors: Xiong Ju Hua , Wang Lu Jie , He Wen Yong , Xing Hao Feng
Published: November 2012

In order to study the application of distributed optical fiber in temperature monitoring of mass concrete, monitoring instruments are embedded in pile cap to carry out the field experiment. The results show that the distributed temperature fiber which is based on brillouin optical time-domain analysis (BOTDA) has the superiority of anti-jamming, corrosion resistance, high precision and continuous measurement. It can accurately reflect the temperature change, effectively guide the construction, and play a positive role in preventing the emergence of concrete cracks caused by temperature change. What’s more, optical fiber has small volume and less influence on engineering, which make it have a good application prospect.
The Influence of Concentration of Pore Water Solution on the Swelling Characteristics of Expansive Soils
Authors: Jia Jing Chao , Li Huan , Bi Qing Tao
Published: November 2012

The influences of pore water solution concentration on the swelling properties of expansive soils were studied using the constant volume swelling pressure experiments and swelling ratio experiments under load. The results indicate that the swelling pressures decrease with the increase of solution concentration. Two specimens made by the same solutions concentration were immersed into solutions with two various concentrations to prepare specimen, one is smaller than the concentration of solution, and the other is same to that. The results show that the swelling pressures and the swelling strains of two specimens are very close. The analysis on the exist state of the pore water shows that the experimental results are agree with the osmotic pressure theory.
The Development of Low-Carbon Economy for Realizing Urban Sustainable Development: Taking the Example of Baotou
Authors: Zhang A. Lin , Zhang Hai Yan
Published: November 2012

As the urban new developing strategy and mode, low-carbon economy meets the requirements for the sustainable development in the urban area. On the basis of development analysis for the low-carbon economy home and abroad, this paper illustrates the challenges that urban area meets in the process of low-carbon economy and sustainable development by taking the example of Baotou, as well as making proposals and suggestions accordingly.
Cold Recycling Technology Application of Old Asphalt Pavement in Rural Road Alteration Engineering
Authors: Guo Zhi Dong , Liu Jia , Li Cang Bo
Published: November 2012

Cold recycling technology of old asphalt pavement is a relatively new technology which has important application in the road surface treatment. Combining with the application of the cold recycling technology in rural old asphalt pavement, this paper analyzes and elaborates its construction technology and experience approach. The existing old asphalt pavement material is used in accordance with the new design requirements to form a special pavement structure surface. On rolling forming sections, the test is conducted for compaction, smoothness, bending and sinking and drill-core sampling for compressive strength. The results show that this process meets the general requirements of pavement base, and the quality is good with the advantages of saving costs and reducing waste damaging the environment.
Study of Natural Disasters Contract Conditions Based on the FIDIC Criteria
Authors: Guo Zhang Lin , Zhang Hua
Published: November 2012

In the trend of global warming, storms, hurricanes, high temperature and other extreme weather phenomena occur frequently. In the field of project construction, the assets value of the building is exposed, so the construction projects are very vulnerable to natural disasters causing huge losses. Who bears in the both sides of engineering contract, the reasons and consequences of the loss and the specific responsibilities are ambiguous without clearly defined. This paper states the importance to grasp the principle of appropriate risk sharing and explain both responsibilities clearly in natural disasters, how to choose appropriate method to evaluate the natural disaster risk and select suitable building construction contract.
Research on Secondary Stress for Steel-Pipe Truss under the Influence of Geometric Parameters
Authors: Wang Hui
Published: November 2012

Based on FEA software ANSYS, 26 steel-pipe truss models with hinge joints or rigid joints are presented, the distributions of total structure secondary stress are analysed under the influences of the mechenical behavior of total structure. The results indicate that the secondary stresses on several links have reached the certain value, and changed regularly following the change of geometric parameters. These changes should be considered in engineering design.
Manufacturing Technology of High-Strength Continuous Compound Spiral Hoop
Authors: Guan Jun Feng , Zhang Qian
Published: November 2012

This paper proposes the use of high-strength continuous compound spiral hoop in avoiding various weaknesses, such as steel wastes from conventional hooped reinforcement, overcrowding of hoop at reinforcement areas, and difficulties in concrete vibration and construction. It also analyzes the advantages of high-strength continuous compound spiral hoop in construction processes, operational key points, and quality control. It shows that the high-strength continuous compound spiral hoop can prevent various weaknesses in conventional hooped reinforcement, minimize the consumption of steel and improve work efficiency.
Key Design and Construction Techniques for Collisionproof Steel Cofferdam for Large Span Cable-Stayed Bridge
Authors: Li Wei Zhou , Feng Zhong Ju , Hu Zhong Chao , Xun Dong Liang , Zeng Jian , Peng Qiang
Published: November 2012

As an example, the design and construction technology of the anti-ship collision suspended steel cofferdam in Shanghai Changjiang River Bridge has been discussed. Design analysis shows that: by using the anti-ship collision suspended steel cofferdam the bridge pier can be protected and adopted lots of collision energy. At the same time, the collision injury degree of the vessel could be reduced. By using the finite element method, the deformation and strain state under the stage of construction and floating-transportation had been analyzed. Considering both the anti-ship collision and the construction, the anti-ship collision suspended steel cofferdam has been designed. In construction stage, the following methods had been developed: the integrally manufacturing method in factory, launching method to river in slideway, fioating-transportion method to the pier position in long distance and set-to-place method by synchronous lifting of two floating cranes. These results listed in this paper are beneficial to the design and construction of the anti-ship collision suspended steel cofferdam.
Monitoring Analysis on Tunnel Portal Shallow Burying Segment of Center Diaphragm Construction Method
Authors: Zhou Fei , Xie Yong Li , Lai Jin Xing
Published: November 2012

Combined with highway tunnel monitoring measurement work of Bijia Mountain, the contents and methods of site monitoring and the analyzing methods for collected data of highway tunnel construction were studied. A comparative way was used to analyze the different curves of displacement with time on the two typical segments of ground settlement convergence and vault crown settlement. The result shows that the site monitoring curves of displacement with time can be divided into normal type and abnormal one. This article puts forward some feasible suggestions about how to guide the safe construction through the two types of curve. The aim of this article is to explore the changing of the abnormal curve before the dangerous accident occur, and give the causes of the reasonable analysis after collapse happened.
Numerical Simulation by CGM for Moving Force Identification
Authors: Chen Zhen , Han Jun Ling
Published: November 2012

The conjugate gradient method (CGM) is compared with the time domain method (TDM) in the paper. The numerical simulation results show that the CGM have higher identification accuracy and robust noise immunity as well as producing an acceptable solution to ill-posed problems to some extent when they are used to identify the moving force. When the bending moment responses are used to identify the time-varying loads, the identification accuracy is more obviously improved than the TDM, which is more suitable for the time-varying loads identification.
Safe and Sustainable for the Structural Silicone Sealant in Ultra High-Rise Building Curtains
Authors: Zhang Hai Long , Quan Ling
Published: November 2012

The properties of the structural silicone sealant under standard condition and after aging conditions were characterized. The results showed that the structural silicone sealant had very good ability to resist the ultraviolet in the long time. In the other aging environment conditions, the different failure time for the structural silicone sealant were appeared. The value of the maximum strength under the different mechanical aging factors obviously existed in the structural silicone sealant with different compositions. The residual strength that the attenuation ratio is more than 75% standard strength would keep the ultra high-rise building curtains safe and sustainable.
Feasibility of Vs Liquefication Evaluation Methods by Bachu Xinjiang Earthquake Data
Authors: Zhao Qian Yu , Sun Rui , Li Yu Run , Wang Wei Ming
Published: November 2012

A discrimination model for soil liquefaction is established by analyzing the liquefied and non-liquefied sites in the Bachu Xinjiang earthquake, based on 44 shear wave velocity data. One of them is based on the Code for seismic design of buildings, which is a linear model. The model is brief and convenient, while the evaluation success rate is 80%. But compared with the nonlinear model, the linear model is not advanced enough. The other model is based on probability analysis, and the evaluation success rate can reach up to 93%. And the discrimination results are high in reliability rely on real data analysis.
The Application Research on the Carbon Fiber Sheet Reinforcement Technique in the Frame Beamstrengthening
Authors: Xu Ling , Gao Wei Ze
Published: November 2012

In this paper,the author is according to aengineering example,to the problem of Reinforced Concrete Frame Structureis shortage of bearing capacity of beamson the Increment of Storey,according tothe requirement of the specifications of the concrete structure reinforcement design,through comparing the different reinforcing method of reinforcement design,take Carbon fiber sheetreinforcement and strengtheningmeasures,Make frame beams achieve the capacity design requirements,realize reasonable Increment of Storey, Further discusses the application of carbon fiber sheet in reinforcement.
Distributed Landsilde Mornitoring by Wireless Sensor Nodes
Authors: Hu Cheng , Zhang Shui Bao , Xu Shou Zhi , Xu Bo
Published: November 2012

Wireless Sensor network (WSN) is an emerging technology widely applied in environmental disasters monitoring. With the constraint of computation resource, it face big challenge of stability and reliability of monitoring network. A statistical model of strain data and distributed monitoring algorithm for landslide based on WSN is studied in this paper. The strain data is modeled using variable mean of Gaussian process. Miss alarm rate and false alarm rate are introduced as critical performance parameters of landslide prediction. Comparing with centralized monitoring method, simulation result shows that distributed monitoring algorithm performs better than centralized monitoring.
The Application of Elastic Wave Reflection Method in the Pile Foundation Inspection
Authors: Liu Jia Sheng
Published: November 2012

The pile foundations are used widely in the construction engineering, so the nondestructive inspection applied in the pile foundation is especially important. This article, based on the basic principle of elastic wave propagation in the pile, elaborates the application of the elastic wave reflection method in the non-destructive inspection of the pile foundation.
Modal Parameter Identification Method for Structural Health Monitoring Benchmark Model
Authors: Li Cheng , Yu Ling
Published: November 2012

Structural modal parameters can be identified using both output responses and input excitations or only using output responses of structures. When the input excitations are known, some frequency response functions (FRF) can be obtained and further used to accurately identify the modal frequencies and mode shapes of structures, but the identified modal damping ratio is often lack of reliability. Under ambient excitations, the peak picking method (PP) is often used to quickly identify the modal parameters of structures, but some vibration modes are missed sometimes, particularly when the dense modes or subjective errors may appear around the peaks picked. Modal parameters can be identified using the stochastic subspace identification method (SSI) based on statistical data, however, the SSI method easily produces false modes in practice. In order to compensate the deficiencies of SSI method, the PP and the SSI methods are combined to identify the modal parameters of the benchmark structure which proposed by the International Association for Structure Control and the task group of American Society Civil Engineers (IASC-ASCE) in this paper. The illustrated results show that this combination method can accurately identify the modal parameters of the benchmark structure with some application prospects.
Optimal Sensor Placement Based on MAC and SPGA Algorithms
Authors: Fu Yong Ming , Yu Ling
Published: November 2012

In order to solve the problem on sensor optimization placement in the structural health monitoring (SHM) field, a new sensor optimization method is proposed based on the modal assurance criterion (MAC) and the single parenthood genetic algorithm (SPGA). First, the required sensor numbers are obtained by using the step accumulating method. The SPGA is used to place sensors, in which the binary coding is adopted to realize the genetic manipulation through gene exchange, gene shift and gene inversion. Then, the method is further simplified and improved for higher computation efficiency. Where, neither the individual diversity of initial population nor the immature convergence problem is required. Finally, a numerical example of 61 truss frame structure is used to assess the robustness of the proposed method. The illustrated results show that the new method is better than the improved genetic algorithm and the step accumulating method in the search capacity, computational efficiency and reliability.
Impact Assessment on the Ore Body under the Tower Footing of 500kV Transmission Line
Authors: Zhang Chen , Yan E Chuan , Zhou Yi , Wang Ya Jun
Published: November 2012

Zhangjiaba-Enshi 500kV Transmission Line is a backbone network in the West to East Power Transmission Project of China, which passes through the factory area of Chongqing Sanxing Iron Mine Factory. According to solving the additional stress on foundation rock produced by tower load based on the Boussinesq theory and the redistribution of surrounding rock stress resulting from iron mining computed by using the calculation formula for redistribution stress on circular chamber in rock mass, this paper analyzes and demonstrates the impact of Zhangjiaba-Enshi Line N327 tower footing pressure mine on mining within the range of mining scheme, and determines that there is no mutual impact between the Zhangjiaba-Enshi Line N327 tower and exploitation of Sanxing ore horizon.
Energy-Saving Experimental Study on Reflective Material Auxiliary Tunnel Lighting Based on Visual Effect
Authors: Liang Bo , Pan Guo Bing , Pi Yu Hang , Li Wen Yang
Published: November 2012

Applying visual performance method, use reaction time measurement system to measure the small target which randomly appears inside the tunnel and analyse the measured data processing results then obtain the relationship between reaction time and the inner wall material、tunnel light and background luminance. We hold that human eyes on different luminance levels in tunnel lighting and visual characteristics of reflection reflection materials obeys Purkinje phenomenon. According to the visual performance theory, we put forward that reflective material assisting tunnel lighting will achieve good effect in energy saving. The study on reflective materials applied in tunnel lighting energy saving play an important guiding significance.
Illumination Energy Conservation Analysis of Reflective Material on the Tunnel Sidewall
Authors: Pan Guo Bing , Shi Ling Na , Liang Bo , Pi Yu Hang
Published: November 2012

This paper endeavors to analyze road lighting quality with the influence of luminous coefficients of the tunnel wall, with lighting design software DIALUX which simulates tunnel lighting, by improving the reflection coefficient of the tunnel wall materials. The result of Analysis shows that high-tunnel side wall reflection coefficient not only helps to improve the tunnel intensity of illumination, but also improves the luminance of the tunnel; under certain circumstances of the road surface luminance, high reflective coefficient of the tunnel walls is helpful to tunnel lighting energy consumption reduction.
Calculation of Underground Tunnels' Safety Factor Based on the Strength Reduction Technique
Authors: Shi Cun Peng , Feng Xia Ting , Jiang Quan
Published: November 2012

The safety of underground tunnels is a key problem of large substructure engineering during excavation and design. A new method to calculate the general safety factor of underground multi-tunnel is put forwarded based on the strength reduction theory. By the way of reducing rock material strength parameters (cohesion strength C and friction angle φ) step by step, the general safety of tunnels is got when the calculated result of excavation simulation shows that the equivalent plastic strain of rock wall becomes connection exactly. Engineering application indicates that the method of underground tunnels strength reduction is very useful for analysis quantitatively the general stability of tunnels and design of substructure.
Study on Foundation Structure for Comprehensive Power Generation of Offshore Renewable Energy
Authors: Wang Na , Chen Da , Liao Ying Di
Published: November 2012

The offshore renewable energy includes offshore wind, wave and tidal current energy. The power generation system of offshore renewable energy uses single form in recent year. It has caused low power efficiency, big power fluctuation and high cost of the foundation structure which will seriously hamper the development of offshore renewable energy. Firstly, a summary about the common form of foundation structure was made. Then basing on the different characteristics of a single energy power generation foundation structure, two different comprehensive power generation foundation types were put forward, and the power generation devices were optimized and reasonably arranged, which are formed a system for comprehensive offshore energy power generation. In addition, the connection, the load and structural features of each comprehensive power generation foundation structure were discussed. The results provide a basis for the design of foundation structure for comprehensive power generation of offshore renewable energy.