bluuebunny/crossref_metadata_2025 huggingface dataset:
Requirement Analysis and Countermeasures of Health Monitoring and Safety Management for Mobile Cranes
Authors: Zhou Xu Sheng , Peng Ren Dong , Ma Wen Bo , Chen Jia Bin
Published: June 2013

With good performance of mobility, mobile cranes are widely used in various industries of the national economy. However, the work locations of mobile cranes are not fixed, the management personnel and operation personnels qualities are not high, and the management systems are not perfect currently. A considerable part of mobile cranes can not get timely inspection and supervision, some even operating with injuries. So the personal injury and equipment damage accidents often happened, with great loss of people's lives and properties. Therefore, it is necessary to study the measures for strengthening health monitoring and safety management of mobile cranes, aiming to reduce the possibility of accidents. The common types of accidents and their causes are summarized in this paper. The main damage modes of mechanical structure are analyzed. Based on the analysis, countermeasures to the health monitoring and safety management of mobile cranes are put forward.
Research on the Influence of MPS to the Nuclei Population Density of Copper Electrocrystallization
Authors: Wang Qing Mei , Sun Feng Yan
Published: June 2013

In this file, the influence of the concentration of additive MPS on the Nuclei Population Density of copper electrocrystallization on a glass carbon electrode (GCE) with different potentials has been studied. The exponential curve has been used to fit test data. From this function, the most nuclei population density of copper electrocrystallization can be estimated under certain experimental condition. From analysis results, we can see that with different potentials, the nuclei population density has different limitations. When the potential is about-0.8 Volt, the largest value of the limitation of the nuclei population density can be achieved.
Research of On-Line System of Structure Health & Safety Monitoring and Warning for Cranes (SHSMW)
Authors: Li Xia , Liu Wen Feng , Xu Kai Hua
Published: June 2013

At present, many cranes in our country are in the extended service. They make rising & descending, rotating and luffing very frequently. They are in the complex and adverse operating conditions and harsh climate and environment, structure failure and accidents often occurred which will cause serious result. Up till now, they are routinely maintained and breakdown repaired. The device and way for failure detection and repair both need to be improved. In this paper the on-line system of structure health & safety monitoring and warning for cranes is developed with the actual situation based on the research both at home and abroad. The operating conditions, the overall property of the structure, vibration, strains on main nodes and members, and the force in the cable are on-line monitored and warned in order to improve reliability of the structure and reduce security risks to avoid serious accident, and greatly improve the efficiency of loading and unloading.
Optimization of the Feedback and Control Module for Light Source of High-Speed Vision Inspection System
Authors: Jia Feng Long , Shao Shuang Yun
Published: June 2013

The situations of insufficient or too much exposure of lights often happen in high-speed vision inspection system. In order to improve the ability to adapt to environment, the feedback and control system is used. If we use the processing method of integral threshold value, the control of light source wont work. Besides, the former feedback system has the stoboflash problem, so optimization design is needed. A new feedback signal extraction method is put forward and the program of source control is optimized, and the adaptability of the diction system to the change of the environment light is improved, it works out the function of controlling the LED light source automatically and steadily under the effects of environment light and the problem of stroboflash.
Comparison Analysis of Fiber Bragg Grating and Resistance Strain Gauge Used in Quayside Container Crane Structural Health Monitoring
Authors: Li Xiang Dong , Li Shi Lin , Zhong Shao Long , Ge Sen
Published: June 2013

Fiber Bragg grating and resistance strain gauge have been used to test the stress change in key parts of structure of 61t-55m quayside container crane under the same testing conditions. The testing data and stress-time history diagrams obtained by the resistance strain gauge and fiber Bragg grating have been analyzed. The results verify good real-time property and high reliability of the structural health monitoring system based on fiber Bragg grating system.
Sensors Distribution Strategies in Guided Wave Sparse Arrays Based on Defects Scattering Properties
Authors: Wu Bin , Zhang Ye Chi , Zheng Yang , He Cun Fu
Published: June 2013

Most of imaging algorithms used in guided wave arrays share the same assumption that the signal scattered from defects will propagate uniformly in all directions. However, some recent researches on scattering properties of guided wave in defects demonstrate that the scattered signal is un-uniform even for a circular hole. Scattering properties of defects were studied and effects of sensors distribution strategies were presented in this paper. A 3D FE model was employed to study the sensor arrangement method and two basic imaging methods ellipse and hyperbola algorithm was used. Experiment was implemented in a 3mm aluminum plate with piezoelectric elements. Results show that for crack-like defects and through-hole, both ellipse and hyperbola imaging algorithms were valid. The number and position of transducers affect the accuracy of crack imaging. To detecting different kinds of defect the preferable array arrangement should be set according to the scattering characterization of defect.
Camera Calibration Method Based on OpenCV
Authors: Qiao Yu Jing , Liu Zhong He , Hu Da Xun , Xu Jing Wei
Published: June 2013

A new calibration method is proposed on the basic of OpenCV camera model and existing calibration method. The method can be accomplished in three concerted steps. Firstly, standardization homography matrix is obtained through camera linear model namely normalized the elements in lower right corner of the original matrix, then the intrinsic parameters matrix and external parameter initial value of camera can be calibrated through solving the statically indeterminate equations with the least square method. Secondly, concerning lens distortion, nonlinear model is obtained, and using intersection point coordinate of chess board and initial value of the first step, initial value of distortion parameters is given through the least square method. Finally, all the camera parameters will nonlinear optimized.
Bamboo, Thermoplastic, Thermosets, and their Composites: A Review
Authors: Rassiah Kannan , Ahmad M.M.H. Megat
Published: June 2013

This paper reviews the topic of bamboo mechanical properties in thermoplastic and thermosets polymer composite. It highlights previous work done in bamboo fiber in terms of the reinforcement composite material. Mechanical testing with experimental has been studied. This literature study will be a good source for those who are interested in doing research for this topic. An overall 62 references have been cited for the further investigation.
Application of Electronic Horizontal Beam and Remote Automatic Monitoring System in the Railway Protection Projects
Authors: Gao Zhan , Xu Kai
Published: June 2013

The paper will introduce the composition and its working principle of the electronic horizontal beam and the remote automatic monitoring system. Subsequently, the author will illustrate specific project to elaborate the monitoring function of the system when people try to control railway track deformation. When tunnel shield crosses under railway, the system can carry on real-time processing, data analysis and then feedback these information to the construction party so as to guide the construction to ensure the security and stability of the railway. This system is applied in the Shanghai subway 9th line crossing project which crosses Shanghai-Hangzhou special railway. With the system, the normal operation of the railway is safeguarded in the process of crossing.
A Novel Self-Healing Optical Fiber Network
Authors: Zhou Zhi , He Jian Ping , Ou Jin Ping , Xiao Hai
Published: June 2013

The safety and reliability of critical civil infrastructures have been a major concern in all countries around the world. However, structural health monitoring (SHM) still faces a number of challenges, particularly in the area of in-and post-disaster monitoring. In addition, due to the large scale in dimension and complexity in geometry of a typical civil structure, a large number of embedded sensors are required to measure various structural and environmental parameters under normal and extreme conditions. To enhance the survivability of a sensor network for life-cycle structural health monitoring (SHM), this paper presents a novel self-healing sensor network. One Spider Orb-Web or network and one hybrid optical fiber (OF) system by combining the local and distributed OF technologies are designed to enhance the functionality of self-healing. Furthermore, three local self-healing sensor nodes, which use light switches or couplers, are designed to maintain the measuring connectivity at hot stress point. Finally, A simple Brillouin sensing network with self-healing nodes is constructed and then validated by the strain measurements of a three-point bend beam. The results show that by using self-healing sensors nodes, the stress state of the RC beam can be successively detected, even when some sensors fail or when the sensing line is broken.
Research on Calculation Methods of Urban Rail Transit Station Ticket Gates Load Degree
Authors: Zhang Chen Chen , Zhang Xu , Wang Yan Hui , Zhu Ling Xi
Published: June 2013

There are many ticket gates at the subway station. The managers are quite careful about the load degree of the ticket gates. This paper studies two different methods to calculate the load degree of the ticket gates. One is based on the station ticket gates group as the research object, and the other one is based on the volume of passenger flow passing in and out of the station as the research object. Then we use the data investigated at Chaoyangmen station in Beijing to test and verify both of the methods. At last, we can get the conclusion that we can get the same result by the two methods, but the method of based on the volume of passenger flow passing in and out of the station is more reasonable.
Multiple Cracks Interaction Model under Creep Conditions
Authors: Si Jun , Xiao Biao , Luo Xiao Ming , Xuan Fu Zhen
Published: June 2013

Multiple flaws are often found in many high-temperature structural components. The interaction and coalescence of multiple cracks may significantly influence the service lives of these high-temperature components. In this paper, the interaction effect on multiple cracks is investigated under creep conditions. At the same time, interaction is considered during crack growth calculation by including the appropriate magnification factors in the calculations of creep fracture parameters. Based on these analyses, the assessment method of high-temperature structure containing multiple flaws is developed.
Research and Optimization of Thermal Power Unit's Automatic Control Based on Frequency Regulation Ability of Power Grid
Authors: Li Jun , Li Wei Wei
Published: June 2013

Wind power and other new energy connected to power grid bring new challenges to optimal operation of power systems. The stability of power grid mainly depends on primary frequency compensation and secondary frequency compensation of thermal power units. By analyzing the theory and practice of DEH and coordinated control system (CCS) of thermal power units, combined with the insufficient of actual primary frequency compensation and automatic power generation control (AGC) strategy response to frequency of accidents, the optimization of primary frequency compensation and AGC of thermal power units automatic control were offered. The practical application results show that the proposed control strategy can effectively control the thermal power units to achieve the stability of power grid frequency.
A Framework Design of Automatic Fault Diagnosis System
Authors: Hu Wei , Deng Yi Bing , Feng Hong Qi , Wu Qing E , Tang Bin , Zou Jian Hua
Published: June 2013

To resolve a lasting suitable cabin environment for the astronauts, this paper proposes an effective framework design for automatic fault diagnosis system. This framework can implement a real-time online diagnosis and decision support for fault, and carry out an early diagnosis for weak fault. Finally, this paper achieves an online automatic fault diagnosis system by using neural networks self-learning characteristics and expert knowledge. In two-men-two-days simulated manned space flight test, the software of diagnosis system framework worked well, which has been assessed and verified comprehensively.
Synthesis of Parallel Manipulator with Single DOF
Authors: Yu Chung Huang , Chung Wen Yeuan
Published: June 2013

This paper proposed a new manipulator design concept which leads to a single DOF system. The system composed of a moving platform and several supporting legs. It can execute the tasks of 3D body guidance or path generation and thus replace expensive manipulators with high DOF in some conditions. There are mainly two steps in designing this manipulator. The first step is type synthesis to determine the number and types of legs. Dimensional synthesis is then executed based on the movement requirements and geometrical constraints. In this study the reduction of the DOF is also analyzed for various legs added between the moving platform and the ground. A numerical example of executing 3D body guidance is given to verify the proposed new concept.
Dynamics Simulation of Multi-Mechanism Operation Parameterization Bridge Crane Modeling Based on Rigid-Flexible Coupling System
Authors: Wu Feng Qi , Xu Hai Xiang , Tang Xiao Ying , Yao Wen Qing , Jiang Yu , Zhang Tao
Published: June 2013

The rigid-flexible coupled system modeling of parameterization bridge crane is conducted based on Pro/E, Multi-body systems dynamics simulation & Finite element analysis software, simulation of multi-mechanism operation process is performed as well. The results of dynamic simulation were analyzed and summarized, which is essential to complete crane fatigue strength calculation.
Finite Element Analysis for Coupling Vibrations of Liquid-Filled Pipe and Support Structure System
Authors: Wang Hai Lin , Zhang Nong , Cao Di
Published: June 2013

t is made the system vibration analysis complexity that the coupling between the fluid-filled pipes and its support structure. Based on the finite element method, the liquid-filled pipe and a supporting structure are firstly modeled respectively. The obtained two sub-system models are then combined using their common nodes displacement. Based on the combined system, the coupled vibration characteristics of the liquid-filled pipe and the supporting structure system are analyzed. The analysis results show that, the strong coupling vibration modes are existed in the support structure and liquid-filled pipe system. If we change the mass and stiffness of pipe, some orders of vibration performance will change obviously, especially for those controlled by the pipe. However, for the vibration decided by the support structure, it is uselessly to change the mass matrix or stiffness matrix of the pipe.
Sensing of Damage in Glass Fiber Composites by Adding Carbon Nanotubes
Authors: Gao Li Min , Qing Xin Lin
Published: June 2013

Advanced fiber-reinforced polymer composites are known to possess outstanding specific strength and stiffness and their use in structural applications continues to expand. Most structural composites are susceptible to the formation of micro-scale damage in polymer matrix under adverse conditions which has significant implications on the durability and performance of fiber composites. Thus, it is imperative to detect the initiation and evolution of damage in composites long before their catastrophic failure. In this report, our recent research in sensing of micro-crack in matrix in situ and in real time for glass fiber composites was reviewed. Carbon nanotubes were dispersed into glass fiber composites by three roll mill technique. A resistance parameter was utilized to quantitatively characterize damage initiation and propagation. Damage mechanisms and development were investigated under tension, fatigue loadings. This research demonstrates the feasibility and benefits of electrical resistance measurements in the sensing of micro-scale damage for fiber composites using carbon nanotubes and offers the potential for in-service health monitoring of composite structures.
Optimal Design of Advanced Grid Stiffened Composite Cylindrical Shell
Authors: Lim Kang Hee , Li Xing , Guan Zhi Dong
Published: June 2013

Advanced Grid Stiffened (AGS) composite cylindrical shells are widely used in aerospace industry. Firstly, the buckling loads for various types of grid structures of AGS composite cylindrical shells were analyzed, and Iso-grid AGS type was selected as a study object which has generally good performance for all conditions. In this study, whole structure weight of the Iso-grid cylindrical shell was kept constant, in which condition the design variables such as grid angle, number of grids, grid height and grid thickness were controlled. Secondly, these variables were optimized by Optimal Latin Hypercube of the DOE method, using Isight. There has two objective functions, one is weight of the structure (for target value), and the other is buckling load (for maximum value). This study was performed through finite element analysis using Abaqus and the accuracy of the analysis was verified by previous studies. Finally, based on the result of numerical simulation, a variable of the skin thickness was added and analyzed whole scale of the AGS composite cylinder. The result shows the influence of each variable on the structure, which can be applied to the optimization of grid structure design, and is also very helpful for reducing the computational cost and obtaining optimization values more accurately.
Optimization of a Reinforcing-Rib Design for ABS and High Glossy Surfaces of Plastic Parts
Authors: Jeong Seong Won
Published: June 2013

The goal of this study is to determine the optimum value of design variables in mixed conditions of the thickness, height and draft angle of reinforcing ribs within an objective limit in ABS resin and a high glossy surface. For this purpose, we investigated the actual depths of sink marks on the surface of the specimen that was manufactured with an injection mold specifically for this study. A response surface methodology with the Box-Behnken design was used to analyze the real depths with combinations of the thickness, height and draft angle of the ribs. The result shows that the most influential factor to increase the shrinkage is the thickness of ribs and that the optimum value of the rib thickness is a multiple of 0.31 of the section thickness. It was found that the rib height and rib draft angle are not factors that can change the sink amount.
The Development Study of Special Equipment Management Information System Based on 3D Visualization
Authors: Zhang Wei Shuai , Han Yun Peng
Published: June 2013

This paper analyzes the management problem about special equipment, and puts forward the special equipment management information system which is based on 3D visualization. Then the paper analyzes and studies the 3D platform construction in-depth, and expounds design ideas of the core module of system.
Development of Quality Cost Model within a Supply Chain Environment
Authors: Aniza Lutfi , Wang Michael H. , Rieger Fritz
Published: June 2013

Determining the quality cost is one of the best ways that can assist industrial or business organizations to know clearly the investment and return of their quality improvement efforts. The information provided by accurate quality cost calculation is also a significant tool that can assist our assessment of the effectiveness of quality management system, as well as identification of quality issues within the organization and creation of opportunities for improvement. The purpose of this paper is to show the development of a quality cost model that includes all possible quality cost components such as Prevention, Appraisal and Failure (P.A. F) costs. Based on reviewing and analyzing various quality cost models, a generic quality cost model is developed. The proposed model can be used as a tool to calculate various quality costs. In addition, it can be used to determine the most serious failure cost. A case study has used to validate the proposed model. In this case, the implementation showed that the model is able to identify and quantify the hidden cost related to the quality in electronic assembly plant. Also, it is used to identify the potential improvement opportunities within the plant.
Optimization of EDM Parameters in Machining AISI D3 Tool Steel by Grey Relational Analysis
Authors: Belgassim Othman , Abu-Saada Abdurahman
Published: June 2013

This study presents optimization of multiple performance characteristics [material removal rate (MRR), surface roughness (Ra), and overcut (OC)] of hardened AISI D3 tool steel in electrical discharge machining (EDM) using Taguchi method and Grey relational analysis. Machining process parameters selected were pulse current Ip, pulse-on time Ton, pulse-off time Toff and gap voltage Vg . Based on ANOVA, pulse current is found to be the most significant factor affecting EDM process. Optimized process parameters simultaneously leading to a higher MRR, lower Ra, and lower OC are then verified through a confirmation experiment. Validation experiment shows an improved MRR, Ra and OC when Taguchi method and grey relational analysis were used.
Thermal Analysis of Inductive Coils Array against Cylindrical Material Steel for Induction Heating Applications
Authors: Samran Santalunai , Thanaset Thosdeekoraphat , Chanchai Thongsopa
Published: June 2013

This paper presented the heating of inductive coil which is 3 elements array. The induction heating coil improve the variations heating that it is increased the system efficiency. By means of the inductive coil has the diameter of 2, 3 and 4 cm and divide the coil as 2 types. There are the inverses and reverse inductive coil arrays, with heating test by cylindrical steel material. Then, this paper considers the heating efficiency simulation of 2 types by CST EM studio 2009. In addition, the experimental of the inductor heating is use the full bridge inverter circuit, the power of 200 W at 28 kHz resonant frequency. Moreover, the distance between coils is coincided of simulation and experimental results, the inverse type at the diameter of 2 cm can be provide the maximum heater.
Evolution of Triz Application for Manufacturing Industries
Authors: Nagappan Annamalai , Shahrul Kamaruddin , Ishak Abdul Azid , Yeoh T.S.
Published: June 2013

The company mission is to be clear choice for affordable technology and manufacturing. Its strategies go with maintaining the technology leadership, deliver manufacturing excellence, exceed customer expectation, be the work place of choice and relentlessly pursue shareholder value. The objective would be delivering leading edge technology at affordable cost, be perceived as the cost leader in manufacturing, and exceeds the customer quality, responsiveness and the product performance expectations. The company businesses use numerous problem solving methods to achieve operational excellence.
The research paper will discuss on the improvement and breakthrough of TRIZ application to address the key problem statement, which is lack of details in problem definition stage, and problem characterization is not really carried out to understand in depth on the area of problem.
Moisture Effects on Cellulose Fiber Reinforced Concrete Properties
Authors: Chen Yu , Bloomquist David , Crowley Raphael
Published: June 2013

ASTM C78, the Flexural Strength tests were conducted on Cellulose Fiber Reinforced Concrete (CFRC) samples subjected to difference moisture-levels to quantify the effect of moisture on them. Results indicated that modulus elasticity did not change along the increase in moisture. However, flexural strength and yield strength appeared to be affected under certain conditions.
Study on the Sustainable Development of Vehicle Ro-Ro Transportation in the Three-Gorge Reservoir
Authors: Xie Shi Ping , Chu Peng Jie
Published: June 2013

The Truck Ro-Ro transportation in the Three-Gorge Reservoir in the Yangtze river, following its first10 years' rapid development, is facing the external competition from coastal expressway and railway freight transportation and experiencing the internal challenge of changing the shipping organization. Ro-Ro transportation enterprises should take full advantage of the macro policy of the overall scheme of Yangtze river gold waterway construction during the "1025" period, concentrate on the development of automobile Ro-Ro shipping route for Ro-Ro hanging transportation, transportation of heavy loads and dangers goods, make the transformation of transport mods in time and promote its sustainable development.
The Properties and Structure Stability of Martensite-Bainite Dual Phase Structure in Bearing Steel
Authors: Lei Tian , Kong Guan Hong , Cui Xue Ying , Feng Rui , Li Sheng Li
Published: June 2013

The Martensite-Bainite (M/B) dual phase structure has excellent combined processing properties which can be applied to the bearing steel. Frequently, the service conditions of rolling mill bearings are so harsh that the organization and performance of the bearing materials may change during the using process. The study of structural stability of martensite-bainite dual phase structure is extremely essential. This paper determined the superiority of Martensite-Bainite (M/B) dual phase structure applied to G55SiMoV by contrasting the properties of single martensite and M/B dual phase structure. temper resistance is discussed by testing the change of organization and performance after temper.The results show that the combination property of the M/B dual phase structure are better than the martensitic structure. The G55SiMoV steel with martensite-bainite dual phase structure has a greater temperature range to ensure the tempering stability.
Dynamic Load Identification Theoretical Summary and the Application on Mining Machinery
Authors: Wang Peng , Yang Guo Lai , Xiao Hui
Published: June 2013

This paper is devoted to describe a new dynamic load identification method about mining machinery structural; Frist, reviews the background of structural dynamic load identification theory; Then, introduce some familiar dynamic load identification methods, including frequency domain method, time domain method and some other new methods; Describe the steps about dynamic load identification method used in mining machinery engineering structures; Last, practice shows that the method is profitable.
Effect of Combustion Chamber Geometry on In-Cylinder Flows and Equivalence Ratio Spread in a Direct Injection Engine - A CFD Analysis
Authors: Harshavardhan B. , Mallikarjuna J.M.
Published: June 2013

In this study, a CFD analysis to evaluate effect of combustion chamber geometry on in-cylinder fluid flows and equivalence ratio spread in a Direct Injection Spark Ignition Engine (DISI) during intake and compression stroke has been carried out. The analysis has been carried out using “STAR-CD es-ice” software for four piston top profiles viz., flat piston, flat piston with a centre bowl, dome piston with a central bowl and pentroof type piston with an offset bowl at an engine speed of 1000rpm. For meshing the geometric model, polyhedral trimmed cell are adopted. The solution is obtained by solving conservation of mass, momentum and energy equations using SIMPLE algorithm. From the results, it is found that for DISI engine, flat piston is best suitable.
Mould Structure Optimization of the Biomass Molding Machine
Authors: Meng Jian Feng , Feng Bai Tao , Dong Yu Ping
Published: June 2013

Biomass is a renewable energy. Its curing and molding technology is one of the key technologies and mould structure is a important factor. A model is set based on ANSYS to simulate the molding, and using curve fitting, the relationship between maximum equivalent stress and mould parameter is founded. Then the optimization model is set and mould parameter is optimized.
A Simulated Annealing to Solve Four-Stage Open Shops with Parallel Machines
Authors: Chou Fuh Der , Wang Hui Mei
Published: June 2013

This paper considers the scheduling problem of the four-stage open shop with parallel machines per stage observed in the chip sorting operation of light emitting diode (LED) testing. In this operation, each job (epiwafer) should be processed by the four working stages without predetermined processing route in order to separate specific LED grades. The considered problem is one of hard combinatorial optimization problems which have not been received much attention in the literature. Due to its computational complexity, in this study, two simulated annealing (SA) algorithms with different initial solutions are proposed to minimize total weighted completion times of jobs. A set of twenty benchmark solutions from a five-job problem is used to evaluate the performances of two SAs. Computational results reveal that the algorithms perform efficient and effective whatever the dimensions of problems are small or large.
A Cost Effective and Efficient Storm Water Gutter and a Novel Honeycomb Wall Using Pre-Cast Elements
Authors: Patil Rajendra K.
Published: June 2013

This paper discusses two innovative designs involving pre-cast concrete elements.The first design, described in Section 1, is of storm water gutters assembled from pre-cast elements that reduce construction time and total cost. Simple and optimum interlocking elements used to build these gutters permit ease of stacking and transport of elements, quick assembly, and possibility of dismantling the gutters if and when necessary. The bottomless design lets water seep into the ground to achieve water harvesting. A table of comparison of the present design with state of the art pre-cast and masonry gutters clearly shows the advantage of the former on many accounts.The second design, described in Section 2, is of a pre-cast slotted block as a unit for constructing cost effective honeycomb walls that provide ventilation and light yet resisting entry of rain water.
Relative Importance of Hazards at Construction Sites
Authors: Torghabeh Zahra Jabbarani , Hosseinian Seyyed Shahab , Ressang Aziruddin
Published: June 2013

Construction hazard identification is one of the fundamental steps in construction safety management therefore identifying hazards and determining their severities of consequences are extremely important. The aim of this study is to investigate and rank the construction hazards in order of the severity of consequences. The data for this study were collected using a questionnaire survey, distributed among respondents randomly selected from construction sites within Malaysia. The results of this study indicated that the most critical construction hazards are Awkward postures, Forceful exertions and Physical injury hazards which originate from process of work and manual handling of operations and equipments. On the contrary Blue green algae and Fungi are the least critical construction hazards which are not critical threats to the safety and health of construction workers. In addition to training and educational purposes, the results of this study can be used in preparing appropriate construction safety and health plans.
A Statistical Study on Structural Characteristics of RC Building Stock of Dhaka City for Seismic Loss Assessment Application
Authors: Alam Mohammd Shafiqual , Sajjad M. Rafi , Yasir Zeeshan , Haque Fuad M. Moinul
Published: June 2013

Dhaka is one of the most seismically hazardous cities in the world and several studies indicate Dhaka to have one of the highest values of earthquake disaster risk index (EDRI) mainly due to its inherent vulnerability of building infrastructure, high population density, and poor emergency response and recovery capability. Assessment of the seismic vulnerability of the building stock of Dhaka is of growing importance since such information is needed for reliable estimation of the losses that possible future earthquakes are likely to induce. The principal aim of this paper is to provide statistical information on geometrical, functional and material properties of the Dhaka building stock for use in risk and loss assessment models, and other types of statistic-or probability-based studies. To achieve this goal, the existing reinforced concrete (RC) stock has been classified as dual (frame-wall) or frame structures. In addition to the statistical parameters such as mean values, standard deviations, etc., probability density functions and their goodness-of-fit have also been investigated for all types of parameters. Concrete properties of existing and recently constructed buildings and characteristics of 40 ksi and 60 ksi types of steel commonly used in constructions have been also documented.
Using Finite Element Method and Support Vector Machine to Evaluate Scour Bridge Condition
Authors: Feng Chung Wei , Huang Hsun Yi
Published: June 2013

Scouring around bridge piers is one of the major reasons for bridge failures and makes disaster since it tends to occur suddenly and without prior warning. However, the mechanism of water flow around the pier structure is complicated, which makes it is very difficult to develop a generic model to evaluate the scour bridge condition and provide a safety level. In this study, an integrated model that combines support vector machine (SVM) and finite element simulation technology is introduced to estimate the scour depth and determinate the safety level of scour bridge by using the natural frequency of the bridge structure. The proposed model in this study provides effective way to have a prior understanding of scour bridge condition and avoid the disaster of bridge failure.
Japan TAF Epoxy Asphalt Concrete Design and Steel Bridge Deck Pavement Construction Technology
Authors: Zhu Cheng
Published: June 2013

The TAF epoxy asphalt concrete (EAC) is a new steel bridge deck pavement materials , the application of the TAF EAC is increasing in China. But the research for some of it's performance and construction technology is not throughly, which results in the useful life of the bridge deck paving materials greatly reducing. This paper focuses on the design and construction methods of the Japanese TAF epoxy asphalt concrete, and take the Humen bridge steel bridge deck pavement repair project in December 2011 for example.
Predicting Annual Heating Demand under Sensitivity Analysis
Authors: Geletka Vladimír , Sedláková Anna
Published: June 2013

The quality of most buildings may be affected during the initial phase of architectural design. It is therefore to optimize input parameters, which significantly influence energy efficiency. In principle it is possible to speak of a deterministic approach, which consider the input parameters to be fixed or a stochastic approach, which takes a wider set of input parameters into account. A single-storey house is evaluated in terms of energy performance in the initial phase of building design, where input parameters are changed in order to determine a correlation coefficient. The methodology is based on a sensitivity analysis (SA) and MonteCarlo simulation based on a stochastic random selection. Regression (RA) were written to express the impact architectural design has on energy performance. Feedback from the regression model estimates annual heating demand of single storey house.
Free Vibration Analysis the Cracked FGM Beam under Bending-Torsion Loading, Using GDQ Method
Authors: Daneshmehr Alireza , Inman D.J. , Fakhar A. Mohammadi
Published: June 2013

This paper presents a theoretical investigation of free vibration analysis of a functionally graded beam (FGM) under the bending-torsion loading using a classical elasticity theory. The FG beam is assumed to have an open edge crack. It is assumed that the material properties of the simply-supported cracked beam, vary along the beam thickness following a polynomial distribution in the thickness direction. This analysis is based on the linear fracture mechanics. First of all, governing equations and boundary conditions of the FG beam are derived using Hamilton's principle. The governing equations are solved using generalized differential quadrature (GDQ) method. By applying GDQ method, the governing differential equations convert to a linear system of algebraic equations. Then solving the eigenvalue problem, natural frequencies of the FG beam can be found. The results indicate that natural frequencies in the presence of a crack are affected by the crack ratio and location.
Study on Compressive Strength of Semantan Bamboo Culm (Gigantochloa Scortechinii)
Authors: Jusoh Noor Zuraida , Ahmad Mansur , Azmi Ibrahim
Published: June 2013

Bamboo is well known as the oldest structural material that posses unique anatomical structure and superior mechanical properties. It has become a subject of interest worldwide and research is being conducted for its structural applications. Structural applications pay more attention on safety, durability and mechanical properties. Many studies carried out previously indeed have shown superior strength of bamboo. In this study, the compressive strength of Semantan bamboo culm (Gigantochloa scortechinii) was determined. Semantan bamboo was harvested from a local bamboo plantation in Malaysia. Prior to drying, bamboo culms were cross cut into shorter length. Specimens from four different locations namely top, middle top, middle bottom and bottom were chosen. They were further group into two portions (node and internode). The comparison of compressive strength between bamboo with skin and bamboo without skin were also carried out. The tests were conducted in parallel direction. The compressive strength at different location is significantly different from each other. Middle top with skin at internode portion has the highest value for ultimate compression stress, compression modulus of elasticity and compression stress at proportional limit.
Analysis of Ultrasonic Signals Generated by Pulsed Laser Action on a Metal Plate
Authors: Song Yan Xing , Wang Jing , Feng Qi Bo , Chen Shi Qian
Published: June 2013

An approach of detecting ultrasonic signals generated by pulsed laser is studied. The influence factors are analyzed on the received signals. Based on pulsed laser generating ultrasonic, a metal plate is used as a detected target. The ultrasonic is induced by way of combining high-power pulsed laser with optical attenuation unit, and then received by a piezoelectric ultrasonic transducer. The difference between ablation regime and thermo elasticity with different pulsed laser input parameters are compared. Moreover the ultrasonic propagation under different thickness of metal plate and the impacts of relative position of stimulating point and detection point on ultrasonic signal is researched. The validity of this method is demonstrated through these experiments and the laser input parameters are determined when in thermo elasticity.
A Mixed Denoising Method Based on Median Filter and Lifting Wavelet Technology for Sewage Sensing Signal Treatment
Authors: Fan Ai Ai , Wang Guang Long
Published: June 2013

Digital signals are often contaminated by noise during signal acquisition and transmission for sewage sensing signal treatment such as aeration volume, oxygen content and water transparency etc. Sometimes, noise is a mixed one of gaussian noise and impulse noise. Unfortunately, existing denoising algorithms are often designed for removing single gaussian noise or impulse noise. In this paper, an efficient algorithm for mixed noise removal in signal is proposed, including space impulse noise removal and wavelet Gaussian noise removal. An impulse noise detection algorithm based on median filter is given to filter impulse signal, also a lifting wavelet was constructed by lifting original wavelet. The threshold based on lifting wavelet transform for signal was applied to denoising gaussian noise. Simulations are conducted on the presented algorithm, and the simulation result shows that this algorithm can remove mixed Gaussian and impulse noise in signal efficiently.
Harmonic Analysis Based on Blackman-Harris Self-Convolution Window
Authors: Qu Jing Wen , Gong Mao Fa , Wang Xiao Yu
Published: June 2013

This paper presents a method of harmonic analysis -- Blackman-Harris self-convolution window harmonic analysis method. Self-convolution window has lower side lobe and decays faster, analyze its performance and compare it with Blackman Window, Blackman-Harris window and Hanning window, calculation formula of frequency, amplitude and initial angle of the fundamental wave and every harmonic are deduced with the phase difference correction algorithm. Blackman-Harris self-convolution window has an excellent side lobe performance, which can effectively suppress the effect of spectrum leakage, embedded systems is easy to implement with spectrum phase difference correction algorithm. Simulation results show that: for Blackman-Harris self-convolution window function, there is a good effect of suppressing spectral leakage, the accuracy of harmonic parameters analysis is better than the classical window function.
Circular Construction of Iris Feature Vectors for Human Iris Recognition Systems
Authors: Na Li , Widatama Danu , Mulia Tony , Kusumoputro Benyamin
Published: June 2013

In this paper, the authors propose a new method to construct feature vectors of human iris based on circular technique. Since an iris has a circular shape, the circular construction of the iris feature vector is expected to have higher ability to capture iris characteristics. Different from the conventional method which constructs iris feature vectors through left to right scanning process, the circular technique scans the pixel-intensity value of iris circularly. As the result, the length of the constructed feature vectors is dependent on the length of iris radius. In the experiments, various recognition methods of feature vectors were compared. The iris recognition results show that the proposed system with Statistical Euclidean Distance method gives the highest recognition accuracy with 84.5%.
Research on the Nondestructive Detection of Ultrasonic Guided Wave Based on the Time Reversal Method
Authors: Lv Wen Chao , Zhou Shao Ping , Cui Ai Qiang
Published: June 2013

Because there are many mode transformations when the ultrasonic guided waves run into defects in the pipeline, the reflected signals got by means of the traditional ultrasonic guided wave technique are complex and the amplitudes are small. The time reversal method is a way to intercept the reflected signals in the initial results with a certain bandwidth and excite the time reversal guided waves on the corresponding nodes. In this way, energies of the guided wave are focused in time and space. By comparing the accuracy of defects identification in the straight pipes and the bent pipes with the traditional ultrasonic guided wave method and the time reversal method, this paper proves that the time reversal method has many advantages over the tradition ultrasonic guided wave method. The time reversal method overcomes disadvantages of the traditional guided wave technique and improves the identification degree and accuracy of defects effectively. It lays the foundation for the final defect identification.
Mechanism of the Oxidation of Iron
Authors: Zhang Ming Huan , Shao Qing , Yuan Lu , Zhou Guang Wen , Wang Yi Qian
Published: June 2013

A layered structure of different iron oxides was produced by thermal oxidation of iron. The structure and microstructure of different layers were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Selected area electron diffraction (SAED) was used to identify the structures of the different oxide layers. Two different structures of Fe2O3were found to co-exist. Based on our observation, a possible oxidation mechanism for iron was proposed. The results shed light on the oxidation process of metals and provide insight into the synthesis of iron oxides.
Slow-Release Behaviors of Poly(vinyl alcohol)/Poly(N, N-diethylacrylamide-co-methacrylic acid) Semi-IPN Materials
Authors: Li Xiao Qi , Zhang Nai Yan , Li Yang Xue , Li Hong Jin
Published: June 2013

A series of semi-interpenetrating polymer materials of poly (vinyl alcohol)/poly (N, N-diethylacrylamide-co-methacrylic acid)(PVA/PDM) were synthesized by free radical copolymerization techniques and semi-interpenetrating polymer network techniques at room temperature with ammonium persulfate and N,N,N',N'-tetramethylethylene diamide as initiators and N,N'-methylenebisacrylamide as a crosslinker. The interior morphology by scanning electron microscopy (SEM) revealed that PVA introduced PDM materials have interconnected porous network structures. The release behaviors of the model drug, aminophylline, are found dependent on material composition and environmental temperature, which suggests that these materials have potential application as intelligent release carriers.
Study of Properties of Nanostructured and Conventional WC-12Co Coatings Deposited by HVO/AF
Authors: Zha Bai Lin , Qiao Su Lei , Huang Ding Yuan , He Wei , Zha Zhi Hong , Li Xiang Bin
Published: June 2013

The three kinds of WC-12Co coatings were sprayed by High Velocity Oxygen/Air Fuel Spray (HVO/AF) in three different spray conditions, HVOF、HVO-AF and HVAF. The high velocity flame flow was produced by HVO/AF with the burning of kerosene and propellant which was mixed by oxygen and air at different ratio, it can be controlled from 1400°C to 2800°C.The microstructure was investigated by SEM, the phase composition was tested by XRD, and the microhardness and elastic modulus of coatings were investigated. The results indicate that the coatings with better adhesive strength and little porosity than conventional ones are dense and have a large value of elasticity and a high microhardness which is 0.4 times harder than the conventional coatings. The coatings are mainly composed of WC and Co, and there are also traces of W2C and Co6W6C. As temperature decreased, the decomposition of WC is being reduced.
First-Principle Calculations for Magnetism of Mn-Doped Graphene
Authors: Liu Jia Jia , Lei Tian Min , Zhang Yu Ming , Ma Pei Ting , Zhang Zhi Yong
Published: June 2013

Mn doped graphene-based dilute magnetic semiconductors (DMS) are investigated using the first-principle calculation based on density functional theory. In this paper, the Mn-C bond length, formation energy and magnetic moment are calculated in different doping systems and their density of states is made a detailed analysis. It is found that Mn-doped graphene has strong ferromagnetic properties and the magnetic moments of graphene supercells are different with the impurity concentrations. These supercells of a Mn atom substituting a C atom are increasingly stable with extending cells and the 11×11 supercell possesses the biggest magnetic moment of 3.8μB in these systems. The analysis of the density of states indicates the magnetic properties of Mn-doped graphene derive from the p-d exchange mechanism.
Performance of Newdal Blended Knitted Fabrics
Authors: Yang Qing Bin , Xu Gang
Published: June 2013

The basic properties of the 3 Newdal knitted fabrics are measured with different instruments. Testing standards are tensile, wear resistance, pilling property and bending properties. By the analysis of the results, the following conclusions can be deduced: Among the 3 fabrics, the mechanical properties of the blended knitted fabrics Newdal /Polyester is the best.