bluuebunny/crossref_metadata_2025 huggingface dataset:
Tool Path Generation for Machining Point Cloud Data by Least Squared Projection
Authors: Xu Jin Ting , Zhang Lei , Wang Yu Jin
Published: September 2014

Point cloud has been used as representation model for tool path planning. However, for point cloud machining, there are few tool path generation strategies but iso-planar method. In this paper, a method of generating tool paths from point cloud for three-axis machining is presented. A simple base surface, such as plane or cylindrical surface, etc., is first created according to the shape of the point cloud. On this base surface, the guide curves of tool path are rapidly designed, and then are projected onto the point cloud surface to generate the final tool path by using the least squared projection method. Finally, this method is tested on a sample surface to demonstrate its validity.
Parametric Design of ITER Outer-Cryostat Based on Application Development of CATIA
Authors: Tian Jie , Dong Zhe Ming , Zhang Ye , Xie Ren Ting , Tong Hua Hai
Published: September 2014

Outer-cryostat is one of the important equipments of the International Thermonuclear Experimental Reactor (ITER). It is the outer part of ITER Tokomak that can offer the vacuum to avoid the great quantity of thermal force influencing the magnet system. In order to improve the efficiency of designing and modifying the system of the outer-cryostat, this paper will research on the exploitation of a sort of software which is based on the CATIA that can conquer the field of parametric design of the outer-cryostat, facing to the complex construction of outer-cryostat with numerous parts.
Rapid NC Machining Technology for Hole and Groove Parts Based on UG Feature Recognition
Authors: Liu Hong Jun , Kou Lin Feng , San Lei , Cao Ning Jiang
Published: September 2014

Based on the UG 6.0 platform, with the three dimensional digital technology, combined with UG CAM template customization, this paper is about the research and development of hole groove class feature extraction module, automatically selecting hole groove parts feature information, through reasoning, to implement the corresponding processing template calls, with the aid of process parameters of knowledge database to realize automatic processing of information given, then to realize the automatic generation of NC program, and to realize the seamless integration of CAD/CAM.
Integration of 3D Mechanical and 2D Electronic Design Based on Open CASCADE
Authors: Zhuo Yong , Zhan Hui Xian , Wu Xuan , Chen Jun Fa , Pan Jun Hao
Published: September 2014

The mechatronic technology raises a new requirement for the product design process which is both mechanical and electrical design need to be more interactive, collaborative and integrated.. In order to satisfy the requirement, in this paper, a new integrated CAD system has been developed based on the 3d modeling kernel Open CASCADE. The main 3D mechanical and 2D electronic digital design functions are developed and integrated in the system. In addition, the electromechanical parts library, which was built in the system, includes not only mechanical information such as 3D package geometry structure but also electronic properties of electronic components. The circuit logical design can be carried out in the 2D logical design module of the system, and next important electromechanical design process is PCB layout and optimazation with mechanical structure are integrated in 3D environment. At last, an example is shown to illustrate the system, which can support the design of mechatronic products, decrease the interactive work and data exchange between mechanical and electronic information and improve the design efficiency.
Catering Revenue Metering System and its Application
Authors: Gu Ya Yin , Deng Xi Dong
Published: September 2014

Revenue metering is one of the most important profit growth modes in services. This paper study the issue based on the Analytical Hierarchy Process (AHP) analyzes, the results show that the revenue metering constitute indicators of the degree of impact on revenue metering, its from the index layer constituting hotel revenue metering to explore the impact of the implementation of the effect of a short board, to establish a perfect hotel revenue metering system to provide a more reliable basis and achieve the desired results.
Research of Airflow Level Posture Sensor Wire Thermal Structure
Authors: Yang Qi Rui , Piao L.H.
Published: September 2014

In order to compare and research the performance of airflow level posture sensor two wire structure and three-wire structure. By using FLUENT-CFD software, through modeling, meshing, solving and other methods, Respectively, the airflow level posture sensor of two-wire structure and three-wire structure are simulated in the sensitive of the velocity field of different tilt angles and different heat source temperatures. The results showed that the tilt sensitivity to changes of velocity of three-wire structure airflow level posture sensor is 0.3831·10-3m/s/0, and the two-wire structure is 0.2487·10-3 m/s/0, and the measurement range of three-wire structure airflow level posture sensor is 00 to 300, the two-wire structure is 00 to 200. The rate of change of three-wire structure airflow level posture sensor’s sensitive internal velocity difference change with the hot source temperature is 1·10-5m/s/0C, and the two-wire is 3.5·10-5m/s/0C. The performance of three-wire structure airflow level posture sensor in inclination and temperature is better than the two-wire structure’s.
Research of DC Panel Battery Fault Detection Method
Authors: Gong Mao Fa , Ge Hui Ting , Gong Zheng , Lin Yu Qing , Liu Bing Qian , Yang Ning Xia
Published: September 2014

This paper elaborates the DC screen and battery DC screen fault detection method. The method of measuring battery’s internal resistance and voltage is analyzed and studied in this paper, and the two methods are optimized. Besides, the structure of the battery internal resistance, internal resistance equivalent principle and other aspects are also introduced in this paper. The optimal measurement scheme can be chosen by comparing the internal resistance measurement of DC discharge method and the AC signal injection method.
Signal Processing Circuit Design Based on SOPC Technology for the Electric Field Type Time Grating Sensors
Authors: Zheng Fang Yan , Chen Zi Ran , Yu Zhi Cheng
Published: September 2014

Signal processing circuits are proposed for the electric field type time grating sensors. The proposed design scheme integrates sampling function and processing function into a signal field programmable gate array (FPGA) based on system on programmable chip (SOPC) technology. Employing NiosII technology and adding self-defined instructions improve data processing speed for time grating sensors. The proposed signal processing circuits are simple and stabile. The proposed signal processing circuits are applied to electric field type linear time grating sensors, the experiments results that the peak-to peak measuring error is 0.3um within 200mm without any corrections.
Structure Analysis of a Pre-Stressed Six-Axis Force Sensor
Authors: Wang Zhi Jun , He Jing , Liu Wan Yu , Xian Li Zhan
Published: September 2014

This study proposes a pre-stressed dual-layer six-axis force sensor with eight limbs, and discusses the structure analysis of the sensor. The number of measuring limbs is determined and the structure characteristics are introduced. Force distribution analysis of the sensor is presented based on the mathematical model and force mapping matrix. The forces on the measuring limbs are decomposed into particular solution and homogeneous solution. The results of the paper are useful for the development and further research of the pre-stressed six-axis force sensor.
Research on Jet Flame Extinguishing Process
Authors: Guo Wen Liang , Guo Zheng
Published: September 2014

The flame used in combustion flame spraying is typical of a high-temperature free jet. The flow fields of free jets are multi-phase flows that couple the mass and heat transfer. This work develops an analytical method to describe free combustion spray jets. The aim of the research is to develop a fully understanding of the characteristics of free-flame jets. Experimental measurements were carried by a unique high-speed continuous CCD camera.
Application on State Evaluation of the Grounding Conductor Based on Fault Diagnosis Method
Authors: Wang Da Xing , Liu Shou Bao , Gan De Gang , He Bin
Published: September 2014

In this paper, fault diagnosis model of grounding grid is established combining electrical network theory with sensitivity analysis. A new method which is used to select the node pairs to calculate the corrosion situation of grounding grid is presented. Based on this method, the fault branch of grounding grid can be efficiently judged through topology diagram and port resistance without power failure and the excavation of large area. Field test was carried out at 220 kV electrical substations using the diagnosis method. The conductors diagnosed as severely corroded was excavated. The result was identical to the diagnosis results, indicating that this diagnosis method has engineering practicality.
The Application and Research of Order Analysis in Gearbox Fault Diagnosis
Authors: Yue Xiao Feng , Zhu Cheng Wei
Published: September 2014

This paper researched the failure mechanism of the gearbox and resample algorithm in order analysis. For diagnosing the types of gearbox’s fault by analyzing the acquisition of vibration signal and extracting the fault characteristics of the gear. A function that relation gearbox vibration signal amplitude to order and shaft speed and transform from the time domain signal to angular domain signal was deduced. The MQ250 gearbox model was applied for the experimental analysis in this paper, the fault mechanism function of this gearbox has been successfully verified and the gearbox fault characteristic information has been extracted.
A Method of Calculation and Optimization Concerning the Dynamic Parameters of Joint Surface
Authors: Guo Tao , Jin Xin , Zhang Zhi Jing , Xu Zhi Yao
Published: September 2014

In this paper, we propose a method of calculation and optimization concerning the dynamic parameters including its normal stiffness and tangential stiffness. We establish a contact model and a dynamic model based on Hertz contact theory, deriving and calculating its normal stiffness and tangential stiffness. Based on the dynamic parameters obtained, we complete the finite element analysis (FEM) and make the modal experiment. verify the correctness and feasibility of the theory model and the FEM model through comparing the theoretical results with the experimental results. On this basis, we establish the dynamic parameters optimization model based on the ANSYS and MATLAB, and successfully obtain more accurate parameters which provide reliable data for the subsequent analysis.
Data Aggregation Based on Saving Energy and Preserving Privacy in Wireless Sensor Networks
Authors: Shan Gui Jun
Published: September 2014

Privacy preserving plays an important role in application of the Internet of Things (IoT). As apart of the IT, Wireless Sensor Networks (WSNs) should provide the privacy preserving in data aggregation. This paper presents a novel energy-saving private-preserving aggregation scheme (ESPART) for Wireless Sensor Networks, which uses characteristic of the data aggregation tree structure to reduce communication overhead. It assigns the random time pieces to nodes with aim to avoid collision, and limits the scope of collusion data to reinforce data—loss resilience. Compared with the SMART algorithm have less communication overhead. ESPART uses data-dependent fusion characteristics of the tree structure to eliminate SMART algorithm for unnecessary communication node, so that in case of the same privacy protection security, the data transmission amount is reduced to about 48% of SMART.
Development of Key Reliability Tester
Authors: He Yue Jun
Published: September 2014

This paper aims to describe the characteristics of the hardware and software control systems of the key reliability tester, including the mechanical design and design method. The tester adopts STC89C51 as the control core. It can be run separately, as well as used as the slave, which utilizes the standard MODBUS-RTU communication protocol through the RS-485 bus and PC machine (host) to form a MODBUS network. Furthermore, it is combined with the host monitoring platform to form a MODBUS network in order to achieve network control. The control software of the key reliability tester includes a master control program and a communication program. The communication program will be described in detail.
The Fault Diagnosis Method of Diesel Based on Wavelet Pocket and BP Neural Network
Authors: Sun Hong Hui , Xu Jun , Zhang Qing Hua , Wang Hong Xia
Published: September 2014

Because of the well time-frequency spectrum disposal capability of wavelet packet, the wavelet packet algorithm is used to analyze the time - frequency characteristics of diesel vibration signals. The signal energy distributing characteristics based on wavelet packet transform. are extracted and taken as diagnostic characteristic vector, then improved BP neural network algorithm that connects additional momentum with self-adaptive learning rate was used to classify and recognize faults of diesel valves. The experimental results show the fault diagnosis method of diesel based on wavelet pocket and BP neural network is effective and feasible.
Study on Inversion Surface Parameters of Remote-Sensing Information Serving Vegetation-Surface
Authors: Wang Hao Peng , Li Xiao Jing , Zhang Jing
Published: September 2014

The paper studied on the inversion surface parameters of remote-sensing information serving for vegetation surface. First, presented the inversion of surface temperature based on four parts: calculation of brightness temperatureyntax of L-systems, calculation of atmospheric transmissivity, calculation of surface emissivity, and D. Precision evaluation on inversion result. Secondly, calculating the atmospheric transmissivity .
Experimental Research on Energy Spectrum Analysis on Chips from Aeroengine Oil System
Authors: Li Chun Guang , Ma Xiao Ming , Tang Hai Jun
Published: September 2014

Inspection on chips from oil system is an important method for modern aeroengine condition monitoring. Energy spectrum analysis technique is the most widely used and effective method in inspection on metal chips. In this method, size and quantity of chips are observed by scanning electronic microscope and qualitative and quantitative analysis of element contents are finished by energy dispersive spectrometer. Through above experiments, material type of metal chips can be analyzed and material mark can be determined by comparison with the materials list used in the aeroengine. In this article, characteristics and advantages of energy spectrum analysis technology are systematically introduced and typical appearance feature and energy spectrum curve of common l chips are summarized in engineering practice. In addition, problems and prospects of energy spectrum analysis technique are proposed.
Defect Inspection for SMD Inductors
Authors: Chang Chun Li , Wu Wen Hong , Weng Rui Cian , Hwang Chi Hung
Published: September 2014

This paper presents a machine vision inspection method for winding high frequency inductors, which affects the reliability and quality of the electronic products. This paper proposes how to quickly and correctly improve the quality of component detection, an important issue for surface mounted device (SMD) inductors manufacturers. SMD components easily damage the phenomenon of the electrode, and the brightness of the brightness of the damaged area of the electrode close to normal, not easy to be precise defect area separated from the electrode area.
Image Adaptive Denoising Method Based on Compressive Sensing
Authors: Zhang Lin , Zeng Xia Ling , Li Sun
Published: September 2014

We present a new adaptive denosing method using compressive sensing (CS) and genetic algorithm (GA). We use Regularized Orthogonal Matching Pursuit (ROMP) to remove the noise of image. ROMP algorithm has the advantage of correct performance, stability and fast speed. In order to obtain the optimal denoising effect, we determine the values of the parameters of ROMP by GA. Experimental results show that the proposed method can remove the noise of image effectively. Compared with other traditional methods, the new method retains the most abundant edge information and important details of the image. Therefore, our method has optimal image quality and a good performance on PSNR.
The Static Load Test Analysis of One Bonded Prestressed Concrete Box Beam
Authors: Rong Xian , Zhao Yu Ting , Zhang Qing Wen
Published: September 2014

This paper selected one bonded prestressed concrete box beam which was No.33-2 in the left picture of shahe bridge of one highway project as a test beam. We tested the deformation (deflection, residual deformation), strain(stress), cracking condition and cracking width under three cycles loading at the middle of span through the static load test. We compared and analyzed the tested values with the theoretical calculating values, then we get the security of the bonded prestressed concrete box beam can be guaranteed.
The Thermal Stress Analysis of Concrete Bridge Tower
Authors: Shen Jian , Liu Xiao Yun
Published: September 2014

Based on a 125 - days natural environment temperature changing observation of one cable-stayed bridge in zhejiang province and the reasonable simplification of the thermal field and stress distribution of concrete bridge tower, the bridge tower thermal stress finite element analysis is done through the first kind boundary condition and the third kind boundary condition. It is confirmed that the deviation of thermal stress between the first kind boundary condition and the third kind boundary condition is below 6% because the outside temperature change range is limited in the practical engineering case. Using the first kind boundary condition can meet the accuracy requirement of the project at the same time greatly simplify the calculation process.
High-Temperature Closure Control Technology of Concrete Arch Bridge Using Cable-Stayed Buckle and Cantilever Construction Method
Authors: Tian Zhong Chu , Peng Wen Ping , Zhou Chao
Published: September 2014

The problem of high temperature closure of concrete arch bridge using cable-stayed buckle and cantilever method was resolved by pre-jacking force and counterweight in the arch rib closure port. The arch closure status effect of temperature difference was error array, the unit pre-jacking force and unit counterweight were impact parameter array. The impact matrix was the arch closure status effect of unit pre-jacking force or unit counterweight. The matrix equation was established on the error and the impact of parameters. Then, the pre-jacking force and additional counterweight value were solved by the least square method. Finally, the control method was verified by the calculation and analysis of Mupeng bridge. It was applied to achieve the closure of arch bridge using cable-stayed buckle and cantilever in any high temperature conditions.
The Time-Dependent Effect of Corrosion of Steel Strands on Prestressed Concrete Beam Bridges
Authors: Wang Peng , Zhang Li , Wang Fu Min , Zhang Zan Peng , He Yun
Published: September 2014

Based on the concrete carbonization theory, we analyze the time when prestressed steel strands begin to corrode, and put forward the degradation time-dependent model for cross-sectional area of a corroding steel strand; with the comparison of existing research results, we propose the degradation time-dependent model for mechanical properties of corroded steel strands, including the nominal ultimate strength and nominal elastic modulus. We deduce a time-dependent model for the prestressing loss due to steel strand corrosion. Taking a prestressed concrete hollow slab bridge as an example, we analyze the time-dependent effect of the corroded strands on the concrete stress at serviceability limit state and flexural bearing capacity at ultimate limit state. Research shows that the bottom edge stress and flexural bearing capacity at mid-span of the beams will reduce sharply if the prestressed strands corrode, even corrosion can damage the safety of bridge in just a few years. These results can be for information of further experiments and researches.
Dynamic Load Test and Data Analysis of Tiansheng Bridge
Authors: Ao Hai Xia , Zhang Yue , Yue Yu Ping
Published: September 2014

This test took dynamic strain detection method depending on time history curve of the dynamic deflection or the dynamic strain analysis of moving load in the control section to obtain impact factor. Using the method of environmental random vibration testing tested vibration response signals of L / 4 section of bridge test span , the cross section and 3 L / 4 section to identify the dynamic characteristics parameters of the overall vibration of Bridge, so that to determine current situation of application , assess the carrying capacity of bridge and test design load bearing capacity. According to the results of load test,the bearing capacity of Tiansheng bridge meets the requirements of "road - grade I" load level.
Static Load Test and Data Analysis of Tiansheng Bridge
Authors: Ao Hai Xia , Zhang Yue , Yue Yu Ping
Published: September 2014

The static load test schemes of Tiansheng bridge are briefly discussed . Through the comparative analysis of the theory values and the measured values , understand the actual work condition of bridge structure under test load and evaluate the bearing capacity of bridge structure .Through comparison of modeling datas and the measured values , test correctness of testing program, providing a scientific basis for the bridge safety and research in great depth.
A Study on the Technique for Fire Smoke Control in Urban Traffic Link Tunnel
Authors: Zhu Jie , Wu Jian Bo , Zhang Zhi Gang , Li Xiao Ju
Published: September 2014

Urban traffic link tunnels (UTLT) have a complex design and are a significant fire hazard. Due to the circular nature of the tunnels, smoke can easily spread through the tunnel during a fire and form a circulation loop, severely hampering safe evacuation and rescue. In this paper, the 2.8km long UTLT in Sichuan, China's Dayuan central business district (CBD) was the study subject. Fire dynamics and similarity theory were employed to perform theoretical calculations and numerical simulations targeting four different mechanical smoke extraction methods under typical fire conditions. Smoke movement was quantitatively analyzed, thus determining which of the four plans was the optimal smoke control technique: semi-transverse ventilation combined with sinking-courtyard air compensation, with ventilation beginning in the fire zone and the two flanking smoke control zones at a rate of 20 ventilations/hour. Our result provides a theoretical basis for designing and running a smoke control system in relevant projects at home and abroad, and serves as both a theoretical and a constructive practical ground for formulating regulations related to UTLT.
Influencing Factors Analysis on Sunken Greenbelt Design of Urban Road
Authors: Zhang Hu Zhu , Li Hui Min
Published: September 2014

In order to provide scientific basis for the design parameters’ selection of sunken greenbelt of urban road, computational formulae of critical sunken depth and sunken greenbelt plant’s submergence time were derived based on the storage-infiltration analysis of sunken greenbelt. And then the influence of various factors on the sunken greenbelt design of urban road were computed and analyzed. Results show that: soil infiltration coefficient, design recurrence interval of storm and sunken greenbelt plant’s submergence time are the key influencing factors on the sunken greenbelt design. Under the same condition, critical sunken depth decreases linearly with the increase of soil infiltration coefficient, and increases nonlinearly with the increase of design recurrence interval of storm. Sunken greenbelt plant’s submergence time is proportional to sunken depth of sunken greenbelt, and it is inversely proportional to soil infiltration coefficient. When the value of soil infiltration coefficient is greater than 10-6m/s and the sunken depth range from 0 to 0.25 meters, submergence time of sunken greenbelt plants is all within 70h, and the sunken greenbelt can most infiltrate the rainfall storage in 1d. Considering all the influencing factors, soil infiltration coefficient of sunken greenbelt of urban road should be greater than10-6m/s and the appropriate sunken depth should be range from 0 to 0.25 meters.
Literature Review of Recycled Concrete Aggregate
Authors: Xu Feng
Published: September 2014

Make old cement concrete as recycled aggregate can not only protect environment, saving resources, but also can reduce the project cost, and promoting the sustainable development. This paper based on the related recycled concrete aggregate (RCA Recycled Concrete Aggregate) literature, mainly involve its properties, preparation and performance of RCA concrete, construction application etc..This has got a lot of reliable conclusions, so as to give some inspiration and help to the related scholars.
Stress and Strain Analysis of Asphalt Pavement Impacted by Temperature and Load
Authors: Li Jian
Published: September 2014

Temperature and load are the major factors of road surface deformation. This paper studies how the temperature causes the road surface deformation and what the deformation trend is. A simplified model of the pavement structure and double round load loading mode were adopted respectively to analyze the stress and strain changes of road surface result of the load and the coupling effect of temperature and load. The major conclusions drew on this study are: stiffness modulus of asphalt mixture attenuates rapidly as the temperature increases, and thereby results in a significant shear deformation of asphalt pavement. At the same temperature, compressive stress decreases with the increasing of load and the deepening of the pavement structure. The influence of coupling effect of temperature and load is more significant than a single temperature or load factor. Under different coupling effect of temperature and load circumstances, the pavement structure influenced mostly by the shear stress is located 3-9cm underneath the surface.
Study on Methods of Lateral Deviation of Track for Static Inspecting in High-Speed Railway
Authors: Li Yang Teng Long , Cen Min Yi , Bai Xuan
Published: September 2014

According to the critical factor of railway track geometric irregular, the deformations of track can be controlled. The lateral deviation is the key to determine the railway track irregularity. Currently, in the static inspected methods, the combined method of geodetic surveys and track surveying trolleys (inspecting instruments for static geometry parameter of track) is widely used in high-speed railway. Depending on some tests, the model of track irregularity in track surveying trolleys can be reconstructed by another method. According to the special features of track of high-speed railway, it is necessary to study on the accurate and effective lateral deviation algorithm which is suitable for the precise track inspection of high-speed railway. Based on some existing methods of construction layout in highway, the primary contents of this paper are: (1) reduces those methods to three algorithms, such as the Longitudinal Deviation Algorithm with Composite Simpson rule (LDACS), the Distance Function Algorithm of Newton’s method (DFAN) and Normal Perpendicular to Tangent Algorithm of Newton’s method (NPTAN), and (2) completes the algorithm steps of DFAN and NPTAN on circular curve, and proves the results of two algorithms on circular curve same, and (3) proposes the three algorithms to calculate lateral deviation and mileage of any rail detection points for inspecting the static geometric state of track in high-speed railway. Depending on some simulation data, the experimental results are: (1) the calculations of DFAN, NPTAN and LDACS, in which the number of subintervals of equal greater than or equal to five, meet the accuracy of the precise track detection of high-speed railway, and (2) the difference mileage and lateral deviation between DFAN and NPTAN are less than 0.001 mm, and (3) the efficiency of those algorithms is very considerable and the efficiency of DFAN is basically the same with NPTAN and higher than LDACS, and (4) the longer the transition curve is, the lower the efficiency and accuracy of DFAN and NPTAN are. The bigger the radius is, the higher the accuracy of LDACS is. According to the measurement data of the Chengdu Dujiangyan Railway Line (Cheng Guan Line), the above mentioned results of (1) and (2) can be proved correctly.
Three Dimensional Modeling and Visual Analysis on Slope Multiple Information of Hurongxi Highway, China
Authors: Zhou Peng , Li Shao Jun , Tang Wen , Xiao Guo Feng
Published: September 2014

The construction of Hurongxi highway is the one of the most difficult highway in the world. Slopes of Hurongxi highway are studied in this paper. Comprehensive three-dimensional (3D) modeling and visual analysis technique based on rock stratum model and skirt weathering model are put forward. The comprehensive model consists of slope multi-information, such as 3D accurate terrain, excavation, engineering measures, monitoring facilities, underground water, bridges and tunnels. An information analysis system of slopes along the highway is established combining database platform. It provides an effective visualization support platform for the analysis of the geological conditions of slope during the construction, decision making of excavation and protection and deformation warning, meanwhile, it also contributes a lot to some other similar slope engineering.
3D Stability Model Test on Revetment Instability and Optimization
Authors: Jiang Yun Peng , Zheng Zi Long
Published: September 2014

2D wave model test was in common use for the verification of structure stability in coastal design in past decades. However, only positive wave could be simulated in 2D model and in practical many coastal engineering were damaged by oblique wave. The revetment stability was tested through 3D wave physical model for a coastal engineering in Dalian city. The result show that wave height in shallow water area would be larger than that in deep area under specific terrain. The stability of revetment armor block in shallow area may be worse than deep area under action of breaking wave in surf zone. The blocks in bottom fail in stability first and then the upper slide down. Oblique wave is more dangerous than positive wave. The necessity of 3D stability model test on verification and optimization of revetment design is reflected once more in this research.
An Ecological Shoreline Protection for Coastal Erosion
Authors: Zheng Yan Na , Liu De Xing , Cheng Liang , An Hong Wei
Published: September 2014

China has been the country which is suffering serious coastal erosion that primarily caused by the increase of hydrodynamic force and the unbalance between input and output sediment. Comparing with the traditional revetment, most of which were made of reinforced concrete, the ecological shoreline protection can prevent coastal erosion in an ecological method. In this article, a biodegradable coastline protection mat (BCP-mat) was proposed and different arrangement methods direct to various areas was presented to solve the problems such as high cost, complicated construction caused by existing ecological method. In the end, the existing technology problems and promotion difficulties was discussed in the perspective of design and management.
Numerical Study on Deform Properties of Transverse Bent Frame under Berthing Loads
Authors: Li Yu Chen , Shi Wei Qi , Shi Rui Long , Zhai Qiu
Published: September 2014

The finite element software ABAQUS is employed to study the force of transverse frame of piled wharves under the berthing loads. Several setups of the foundation of piles, single, double, triple piles and transverse bent, are modeled and the deformation and deflection under different setups are calculated. The deformation properties of transverse bent are analyzed under the berthing loads.
Study on Synthesized Wind in the Numerical Simulation of Wind Waves
Authors: Jin Luo Bin , Li Yuan , Liang Lian Song
Published: September 2014

Numerical simulations are made for 10 storm wave processes during the period of 2008-2010, based on SWAN, with the Myers wind field, CCMP wind filed and the combination of the two as the storm driving wind field respectively. The results are compared with the observations from Jason-1 satellite altimeter during tropical cyclones (TCs). It indicates that Myers wind field makes a good agreement with measured values near the TC center, while CCMP wind field makes a good agreement with measured values far away from the TC center. Synthesis of the wind field combines the merit of the Myers wind field and CCMP wind field, and it is more in line with the wind field distribution; the simulation results of synthesized wind field make a good agreement with the measured results, with maximum deviation of -0.62m, mean deviation of -0.11m.
Wave Spectrum Analysis of Kerry Deepwater Port Sea in Cameroon
Authors: Xiao Hui , Zhang Yi Feng , Zhao Hong Bo
Published: September 2014

According to the measured wave data for one year in Kerry deepwater port sea area, Cameroon, the wave spectrum characteristics calculate using fast Fourier transform method; the result shows that the bimodal spectrum is given priority to this sea area, and the big wave appears in summer and autumn, the long period wave influence is opposite bigger that should be pay attention.
A Comparison of Fatigue Design Recommendations for Welded Details
Authors: Zhao Er Nian , Qu Wei Lian
Published: September 2014

The fatigue strength of weldments is remarkably different form smooth specimens due to the welding. To deal with the fatigue assessment of the various types of the weldments, the weld detailing catalog is widely adopted in the fatigue recommendations. This paper focuses on the comparison of fatigue design recommendations for welded details. Meanwhile the resent development method in the fatigue assessment is also discussed.
Durability in Cold Area of Prefabricated Concrete Structures
Authors: Wang Ya Bo , Qian Lei , Dou Gao Feng , Xi Chuan Hao , Liu Han Ting
Published: September 2014

The factors affecting durability of concrete structures is described in This paper .It is pointed out here that is the concept of durability in prefabricated concrete structure , the influencing factors and failure mechanism in cold regions. It is proposed which are the methods and corresponding measures to enhance the durability of concrete structures.
Fabrication and Coagulation Phenomena of ZnO Microsphere Particles
Authors: Yan Gang Yin
Published: September 2014

The uniform ZnO microsphere particles with a diameter of 390nm were synthesized by two-step method (also named seed solution method) projected by Eric W. Seelig. The chemical reaction details in the container were analyzed and the generation mechanism of ZnO microsphere particles was studied. ZnO films were prepared by vertical deposition. Coagulation phenomena occurred during the reaction process. The reaction conditions of coagulation phenomena were summarized and given reasonably explanations.
Influence of Calcined CaSO4 Whisker and Dispersion Method on Bending Strength of Gypsum Board
Authors: Chen Chang , Wang Yu Bin , Zhang Wei , Xue Xiao Yu , Liu Lei , Song Yi
Published: September 2014

The hydration ability of CaSO4 whiskers calcined under the condition of 475-500 °C for 10-60 min was researched by X-ray diffraction and scanning electron microscope. The optimal calcined CaSO4 whiskers were added into building gypsum and the bending strength of gypsum board was influenced by different dispersion methods. The results show that the whiskers calcined under 475 °C for 30 min begin to hydrate and the aspect ratio of whisker calcined under 500 °C and 525 °C has no changed for 1 h of hydration time. The bending strength value of gypsum board with ultrasonic dispersed whisker is lower than that of gypsum board with directly mixed whisker.
Nano-Indentation for Measurement on Mechanical Property of Building Integrated Amorphous Silicon Thin-Film PV Cell
Authors: Li Shun Mei , Mei Jun , Liu Yu , Yao Yong , Lan Lin Gang , Li Ming , Yang Xiao Pan
Published: September 2014

Amorphous silicon thin-film PV cell(AST) generally consists of a few – micron thick silicon film on a glass substrate, which has difficulty for being accurately measured by using a conventional testing method to obtain its elastic modulus and hardness. In our study, we are applying nanoindentation for the measurement purpose and divide the sample into five regions for studying. Both of peak load - and loading rate - dependences supervise us to more accurately measure the mechanical properties of silicon layer through defining the peak load at 9000μN and loading rate at 1000μN/s. It was also observed that across the whole sample measurements on the elastic modulus have much better consistence than those on the hardness. We therefore propose a method of partitioning the sample into two parts for counting the different hardness measurements.
Research on Sodium Polyacrylate and its Effects on Mechanical Properties of Slag-Based Geopolymer
Authors: Chen Xiao , Chen Li Shun , Xu Jian Tong
Published: September 2014

This report mainly studied the influence of dosage of the sodium polyacrylate on mechanical properties of slag-based geopolymer, and secondary studied the effects on mechanical properties of polyacrylic acid. The analyzing results indicate that compare to the polyacrylic acid, sodium polyacrylate has obvious effects on mechanical properties of slag-based geopolymer. And it’s mainly reflects on the nature of the 28 d, it’s early effects is not obvious. The mechanical properties of slag-based geopolymer doesn’t change with the dosage of sodium polyacrylate increase linearly, but overall mechanics properties is significantly superior to the blank sample.
Study on Mechanical Properties of Concrete under High Temperature
Authors: Wang Li , Zhang Yao Jun
Published: September 2014

The resistance ability of concrete structure imminent. This paper synthesizesdomestic and foreign literature on data to study theproperties of concrete under high temperature, the more consistent view, point out the shortcomings of this research, puts forward the problems need to be solved further, proven direction for the study on hightemperature properties of concrete.
Experimental Characterization of Carbon Nanotubes on the Stainless Steel Substrate from the Controllable Flame
Authors: Liu Yuan Chao , Che Jun Tie , Ren Jing Hao
Published: September 2014

Preparation of carbon nanotubes from the controllable flame is a kind of new method. Experimental apparatus is including controllable flame burner, temperature measuring instrument, mass flow meter and catalyst preparation system, etc. The sampling substrate is the growth platform of carbon nanotubes in the flame. The type316 stainless steel is selected as sampling substrate in the experiment. Carbon monoxide provides carbon source and hydrogen/helium premixed gas acts as protection gas. Characterization of the carbon nanotubes on the stainless steel substrate from the controllable flame is by scanning electron microscope (SEM) and transmission electron microscope (TEM). It was found in the experimental that the iron-based catalyst particles are mainly distributed in the ends of the carbon nanotubes. The experimental results reveal that the growth of carbon nanotubes will be very exuberant if the sampling time is controlled within ten minutes.
Preliminary Collapse Simulation of a Reinforced Concrete Flat Plate Substructure Using Spring Connection Modelling
Authors: Xue Hui Zhong , Guan Hong , Li Yi
Published: September 2014

To investigate progressive collapse behavior of reinforced concrete (RC) flat plate structures, a reliable and efficient numerical approach is developed in this study using spring connection modelling. This connection unit aims to simulate complicate punching shear behavior at critical regions surrounding the columns. Five springs are used as the connection elements: two for flexural and integrity steel bars and three for concrete contributions. The flexural and integrity steel bars embedded in the columns are modeled explicitly, which enables the model to present the structural behavior post punching shear failure. Bending and shear actions are represented by two concrete springs. The third concrete spring is assigned axial action property to restrain two end nodes of the connection on the model. In particular, the punching shear spring controls the connection unit when punching shear failure occurs. To apply the connection unit, the regions of slab-column connections are partitioned from the slab regions according to the critical shear surfaces. Then the connection unit links two corresponding nodes on the two edges formed from the partition. A physical experiment of a RC flat plate substructure under progressive collapse is simulated. Result comparison demonstrates that the numerical model has the capability to capture the structural behavior in progressive collapse. However, further improvement of the modelling technique is necessary to enhance numerical accuracy.
Effect of Phosphogypsum on the Properties of Over-Sulfur Phosphogypsum–Ground Granulate Blast-Furnace Slag Cement
Authors: Lv Zhi Jiang , Lin Zong Shou , Wang Hao Jie
Published: September 2014

Over-sulfur phosphogypsum(PG)–ground granulate blast-furnace slag(GGBFS) cement paste is utilized by GGBFS, Portland cement clinker(PCC), additive, water and modificated phosphogypsum paste(MPG), produced by milling PG mixed with a certain proportion of steel slag(SS), GGBFS and water. The effect of PG on the properties of over-sulfur PG– GGBFS cement was investigated. The mechanical performances and hydration mechanism of the cement with different kinds, proportions and particle size of PG were analyzed based on setting time, volume stability, strength test, XRD and SEM analyses. The experimental results show that,the optimum mixture of PG amount in the binder was 45%. Overdose of PG may caused strength deterioration. The optimum grinding time of MPG in the binder was 20min. The soluble phosphorus content of PG in the binder was under 0.05%.
Application of Precast Concrete Shear Wall Structure in Residential Projects
Authors: Wang Yong , Xia Xiao Xi
Published: September 2014

In order to adapt to the development of housing industrialization and the construction of energy-saving emission reduction requirements, research and application of precast concrete shear wall structure is becoming the hotspot in structural engineering. The DiJie international city B Neighborhood Project No. 8 residential building the form of engineering structure for precast shear wall structure. According to the practical application of prefabricated wall panels, balcony board, air conditioning board and stairs in residential projects, Introduced the key technology of component production, installation, cast structure node connection construction process using prefabricated in shear wall structure. In order to provide the reference for precast concrete shear wall high-rise residential design in the future.
Research of Polypropylene Concrete’s Pavement Performance
Authors: Zhang Ting , Zhou Yi Tang , Li Luo Ke , Fan Xiu Ying
Published: September 2014

Emergence of commodity concrete and pumping concrete is a major development of modern concrete technology, it has high efficiency, high homogeneity and good environmental effects, etc. But, use of modern high performance concrete make the difficulty of controlling the early cracks increased, considering this problem, use of polypropylene fibers to test concrete shrinkage cracks, come to regularity of polypropylene fiber affect concrete shrinkage cracks early, in order to serve the synthetic fibers used in concrete better.
Microstructure Analysis of Ti-Al Intermetallic Compound Aluminized Layer Generated in Low Temperature
Authors: Wang Xiu Chun , Wei Jun , Zhang Lin Lin , Yi Xi Bin , Zhang Jing , Li Mu Sen
Published: September 2014

By using mechanical energy aided aluminizing process, an aluminized layer of 20~180μm was obtained on titanium plate at a low temperature of 650~700°C for 3 hours. The aluminized layer consists of an outer layer of single-phase aluminium, an inner layer of (Al,Si)3Ti intermetallic compound and aluminium bipolar layer, the silicon element is riched in the Al3Ti intermetallic compound.
Effect of Polyacrylic Acid on Retarding Action and Property of Gypsum Plasters
Authors: Zhan Jia Yu , Li Wan Min , Luo Ning , Gu Jun
Published: September 2014

Polyacrylic acid was synthesized and used as a retarder additive to prolong the setting time of gypsum plasters. The gypsum paste with the polyacrylic acid at the concentration of 0, 0.1%, 0.2%, 0.3%, 0.4% and 0.5% was studied. The water/gypsum mass ratio was 0.56. The influence of polyacrylic acid concentration on the initial and finial setting time, hydration temperature, morphology of hardened gypsum and mechanical property were extensively investigated. The results show that polyacrylic acid is favorable to increase the setting time which was associated with the reaction of carboxylic group and calcium from the hemihydrate dissolution. The morphology of hardened gysum varied when polyacrylic acid is used. The increase concentration of polyacrylic acid results in a decrease in hydration heat release, flexural and compressive strength.
Modal Analysis for the Vibration Isolator of the Laminated Curved Plate
Authors: Huang Hui Rong , Li Jie
Published: September 2014

Based on the APDL parametric design language, the models of the first to the tenth-order for the vibration isolator of the laminated curved plate were analyzed. The natural frequencies and maximum deformation for resonance of all modes were obtained .Then the curves of the influences on the natural frequency which was influenced by the thickness of the curved plate were concluded. The result shows that the thicker curves plate is, the smaller the value of the natural frequency is.
Fabrication Processes of Residential Building Adopted Cruse Housing System
Authors: Shin Jae Min , Kim Gwang Hee
Published: September 2014

In South Korea, the need for residential modular buildings has highlighted, due to the increase in demand for small housing and the high land price in urban area. Thus, the cruse housing system (CHS) was developed to build high-rise residential buildings. The object of this study is to analyze the characteristics and fabrication processes of CHS residential buildings when the in-fill construction method is adopted. The result of this study showed that there is the potential to utilize the fabrication processes of CHS in-fill construction system to build high-rise modular buildings.
The Study on Fire Control Facilities Problems of Large Underground Garage
Authors: Han Fan Yuan
Published: September 2014

With the development of social economy, the car has been gradually into the ordinary families. Now Chinese car ownership are increasing year after year and simultaneously the shortage of parking lot are increasingly prominent, so we need to construct large underground garage to better solve the problem of parking space nervous, and then the fire safety of underground garage will be a problem. According to the characteristics of the underground garage fire, the paper analyzes the application conditions of several kinds of fire control facilities commonly used in practice and puts forward the integrated design concept of fire control system and by promoting the combined automatic sprinkling and foam system, the paper also provides some useful reference for city fire protection design of underground garage.