bluuebunny/crossref_metadata_2025 huggingface dataset:
Organized Assembly and Morphologies of Aromatic Schiff Base Compounds in Organized Molecular Films
Authors: Xiao Yong
Published: June 2013

A novel aromatic Schiff base ligand has been designed and its interfacial phase behavior as well as the in situ coordination with Cu(II) ion was investigated. A series of measurement methods, such as surface pressure-area isotherms and atomic force microscopy measurement, have been used to characterize the deposited monolayer and multilayer films. It has been found that both the ligand and the corresponding complex formed stable monolayer or multilayer films at the air/water interface, which could be subsequently transferred onto solid substrates to construct Langmuir-Blodgett films. It was interesting to note that there existed a novel phase transition when the ligand was spread on pure water surface. During this phase transition, the two dimensional flat film changed into a three dimensional fiber-like nano-architectures. However, upon coordinating with Cu(II) ions, only flat films were obtained. Such distinct difference was suggested to be mainly due to the change of molecular conformation and/or the hydrophobicity in the process of supramolecular assembly at the air/water interface.
Loose Detecting of Tower Crane Bolts Based on Time Series Analysis
Authors: Wang Sheng Chun , Tian Yan , Song Shi Jun , Wang Qing
Published: June 2013

This paper deals with the loose detecting of tower crane bolts which is one of the core issues of the tower crane structure health monitoring. Based on the time series model ,we make research on the method of extracting the structure damage factor of tower crane. First, we establish an AR model with the detecting data, use AIC criterion to get AR model order,and then select the residual variance of AR model as the damage sensitive factor. Furthermore, we carry out a single-limb experiment on tower crane and analyze the single-limb experiment state. Good condition and injure state are compared using the above approach. It was found that the approach could effectively judge the healthy and injury states of the tower crane structure with an application value of real-time online damage diagnosis for early warning.
Design of the Post-Processor for Rotors Dynamics Based on the STEP Standard
Authors: Liu Bao Guo , Hua Hai Feng , Yue Long Wang , Xu Xiao Ding
Published: June 2013

The STEP standard is an international standard for data expressing and exchanging during the whole life cycle of the product, the neutral file is an universal data exchange form for the data exchanging. In order to develop a STEP post-processer for the rotor dynamics analysis software-Rotors Dynamics, the author elaborates the lexical analysis module and data mapping module, studies the rotor model parameter extraction based on STEP neutral file, and realizes the seamless connectivity between the Rotors Dynamics and the rotor’s CAD model.
Human Motion Tracking Based on B-Spline Snake Algorithm
Authors: Wang Qun Long
Published: June 2013

A new method for tracking of moving human objects is presented. The developed algorithm is based on B-spline Snake model. The Snake algorithm accesses the object contour through minimizing the energy; the object contour in each frame is presented through three B-spline curve. This approach gets the change image with double thresholds image segmentation between the neighboring frames, it could detect moving human objects with high quality and locate objects approximately. The contour extracts from the last frame put at the approximate position as the B-spline Snake model initialization. It accomplishes the tracking of moving human objects.
Implementing Sparse Matrix Ordering Using Hypergraph Partitioning
Authors: Yao Lu , Yang Yi , Wang Zheng Hua , Cao Wei
Published: June 2013

Matrix ordering is a key technique when applying Cholesky factorization method to solving sparse symmetric positive definite system Ax = b. Much effort has been devoted to the development of powerful heuristic ordering algorithms. This paper implements a sparse matrix ordering scheme based on hypergraph partitioning. The novel nested dissection ordering scheme achieve the vertex separator by hypergraph partitioning. Experimental results show that the novel scheme produces results that are substantially better than METIS.
Design and Implementation of Multiple Linked Lists Sharing the same Memory
Authors: Gao Yong Ping , Zhang Jun
Published: June 2013

In some languages, because there is no pointer data type, so the single linked list is described by the use of the array. When there are multiple nodes of the same type list, these lists can share the same static linked list of memory, so it can mutually adjust the remaining places to reduce the overflow space. To solve practical problems, this paper is designed from the static linked list sharing the same storage space, the constructor, inserting operations, deleting operations, and it puts up forward a suggestion of its specific implementation and analyzes time complexity of algorithms and its significances.
Software Tool Used for Transformer Design in AutoCAD Environment
Authors: Liu Gao Jun , Fu Chun Hua , Wang Chun , Liao Ying Hua
Published: June 2013

The paper presents a software tool used for designing transformer in AutoCAD environment. The application allows the user to generate 2 serials of transformer easily. DSTool application has been developed using OpenDCL and VisualLISP environment and runs in the AutoCAD environment. The user can input some key parameters into the dialog provided by DSTool, more than 200 dwg files could be generated in 3 minutes.
The Parametric Design and FEA of SolidWorks Based on the VB
Authors: Cao Kan , Han Peng Biao , Liu Qing Hua , Li Chao , Geng Jian Pu
Published: June 2013

Parametric design is an important application of the secondary development of SolidWorks. The characteristics of parametric design and the methods and the process of the secondary development of SolidWorks are introduced. The secondary development of SolidWorks realized the parametric design and FEA for the lower support plate of bridge bearing.
Aviation Oil Demand Combination Forecasting Based on Vectorial Angle Cosine
Authors: Wang Jun , Sun Zhi Hong , Zhang Li
Published: June 2013

According to the individual forecasting of aviation oil consumption, with taking the minimum value of the angle between the actual value vector and the predicted value vector as a target, we established a combination forecasting model based on the vectorial angle cosine. Through the analysis of an actual example, from the perspective of the effect evaluation indicators of prediction reflect that this combination forecasting model is advantage compared to each single forecasting model.
Characteristics Analysis of Plane Processing of Sapphire Corundum Crystals
Authors: Wang Ning
Published: June 2013

In order to solve the problems of plane processing of the sapphire corundum crystals, an orthogonal test design was put forward to investigate the key factors that influencing the quality of grinding and polishing, and the optimal plane processing parameters were obtained by visual analysis. The samples of the sapphire corundum crystals were processed using the optimal plane processing parameters, and the surface roughness was also detected using Mahr roughness instrument, the test results show that the plane quality is improved dramatically.
Flight Safety Assessment of Airlines Based on Analytic Hierarchy Process
Authors: Wen Xing Zhong
Published: June 2013

Risk assessment to flight safety is an effective measure to ensure safe operation of airline companies. There are many factors affecting the flight safety, so the analytic hierarchy process (AHP) is introduced to assess the risk. In this paper, an index system of airline company flight safety risk assessment is established. A model of airline company flight safety risk assessment based on analytic hierarchy process (AHP) is also set up. An example is used to show the application of this method. The result shows that this method is rational and pragmatic in airline company flight safety risk evaluation.
Research on the Construction Method of ERP System Structure of Lu Brocade Enterprises
Authors: Yang Li Na
Published: June 2013

ERP (Enterprise Resources Planning) is a kind of management software system which makes a balance and coordination of the overall planning and utilization of all resources on the supply chain, value chain and information chain of the enterprises. It is a management concept concerning the market orientation of production manufacturing. Lu brocade enterprises should construct the ERP system according to the actual needs. The design principle for the ERP system and benefits brought about with the implementation of the ERP system for Lu brocade enterprises in their scale operation.
The Application Status of Weapons Fault Diagnosis Technology
Authors: Zhong Meng Chun , Zhang Chun Lin , Li Hua
Published: June 2013

based on the explanation of the connotation of the fault diagnosis technique, this paper introduced the application status of the main fault diagnosis technology of the weapons in both domestic and overseas, also points out the single fault diagnosis technology showed great limitations to the maintenance of the modern weapons. Researching and using the hybrid fault diagnosis technology is a development trend for the weapon maintenance both at present and in the future.
The Analysis of Categories of Users in Car Design
Authors: Li Ke , Li Hao , Liu Jian Hua
Published: June 2013

Based on the concept of humanization design, some classification and analysis about user groups from user's age, gender, value, interests and economy were made in this paper. Due to the differences in ages, genders, values, interests and economy, different groups of users will have different styles and preferences. But users want to meet their psychological pursuit in the process of using the product. As the carrier of user groups, car design that can meet user’s demand has been discussed. Classify and categorize for users were made form user groups first, then design products that can mostly suitable for different user group and that the most they really demand for.Through taking full account of the needs of user groups and meeting user's emotional needs maximize, this products designed will be the products users wanted.
Preparation and Structure Characterization of Poly(lactide-co-ethylene carbonate) Microspheres
Authors: Cheng Chun Sheng , Yang Ji Yi , Qin Yu Yue , Fan Jian , Zhao Tian Rui , Yuan Ming Long
Published: June 2013

The purpose of this study was to prepare and characterize tinidazole-loaded poly (lactide-co-ethylene carbonate) (PLEC) microspheres. These biodegradable microspheres were prepared by solvent evaporation method. The effect of selected emulsifier, polymer type, and ratio of tinidazole to PLEC were investigated. An aqueous gelatin solution used as emulsifier resulted in uniform microspheres with spherical surfaces. The PLEC microspheres exhibited rough surface and porous internal structures when compared with the PLA microspheres. The ratio of tinidazole to PLEC (1/10) exhibited higher encapsulation efficiency and drug loading of tinidazole. The introduction of hydrophilic PEC content influenced the structure and encapsulation efficiency of microspheres. These results suggest that the novel PLEC microspheres can be useful for drug delivery systems.
Study on Atmospheric Pressure Plasma Processing of Fused Silica
Authors: Wang Dong Fang
Published: June 2013

In order to get ultra-smooth surface without subsurface damage efficiently for fused silica, the atmospheric pressure plasma processing (APPP) is developed. It is based on chemical reaction between active radicals excited by plasma and workpiece surface atoms, so the subsurface damage caused by contact stress can be avoided and atomic-level precision machining can be achieved. In this paper, the influence on material removal function by the key factors of APPP including the flow rate of reaction gases, input power, and processing distance are discussed. In addition, by the regression model a quantitative mathematical model of the material removal function of the atmospheric pressure plasma processing on fused silica is established. And this model is verified by experimental data.
Study on Preparation and Tribology Behaviors of Ni-P Electroless Deposited Nanocrystalline Coating
Authors: Zhang Jing Yao , Xiong Dang Sheng
Published: June 2013

Ni-P nanocrystalline and amorphous coating were fabricated by electroless deposition technique in the same bath except for varying complexing agent. Heat treatment at lower temperature was carried out to the two kinds of coatings above. The phosphorus content and organize structure of the as-deposited coatings was determined by means of inductively coupled plasma atomic emission spectrometry, X-ray diffractometer and transmission electron microscope. Moreover the effects of heat treatment and structure on microhardness and tribology property of coatings were studied by means of microhardness tester, friction and wear tester and scanning electron microscope. Outstanding tribology property of Ni-P nanocrystalline coating compared with the amorphous one owed to the fine nickel grains with a size of several nanometers. While the proper heat treatment process was found to be responsible for improved property of both coatings.
Chiral Separation of Amlodipine and its Enantiomer on a Molecularly Imprinted Polymer-Based Stationary Phase
Authors: Li Zhi Wei , Jia Xing , Xu Chun Mei , Liu Lei , Fu De Cai
Published: June 2013

A new chiral stationary phase for amlodipine (3-ethyl 5-methyl-2 -[(-2-(aminoethoxymethyl)-4-(2-chlorophenyl)-1,4-dihydro-6-methyl-3,5-pyridinedicarboxylate) based on a molecularly imprinted polymer has been prepared by radiation polymerization method and used for chromatographic separation of the chiral enantiomers. The effects on the separation of mobile phase and flow rate were investigated, and the optimum conditions for HPLC were shown to be: mobile phase, chloroform; flow rate, 0.3 ml min-1; at room temperature. The results has shown that the amlodipine-imprinted polymer was capable of recognizing the enantiomeric difference between the template and its R-enantiomer, whereas the non-imprinted and thermal polymerization polymer have no chiral recognition ability for the enantiomers.
The Structures and Features of Atomic Defects in Fe-Al Alloys
Authors: Zhou Zheng Cun , Wang Qing Zhou , Du J. , Yan Y.J. , Gu S.Y. , Yang H.
Published: June 2013

The formation and characteristics of atomic defects in Fe-Al alloys and their influences on order-disorder and vacancy-hardening are investigated and discussed in this paper.
The Temperature Field Test and Numerical Simulation of Steel’s Friction Stir Welding Process
Authors: Wang Xi Jing , Lu Yong Xin , Zhang Zhong Ke , Liang Jian Li , Guo Ting Kai
Published: June 2013

For the friction stir welding technology of the low carbon steel, according to the character of the friction stir welding process, the researchers build a simplified heat input numerical model, and use the finite element analysis software ANSYS to simulate the transient temperature field distribution and the feature points of thermal cycle curve of the 4 mm Q235A steel in the butt joint. Comparing the simulation results and the feature point temperature curve measured by the thermocouple, the researchers verify the heat input model and simulation method is correct. It provides the scientific basis to select the right experimental parameters.
Application of New Ecological Clothing Materials in Green Design for Dressing
Authors: Wang Xiao Man , Wang Xue
Published: June 2013

Under the guidance of ecological civilization, the research field of clothing materials has also started to advocate “ecological clothing materials” and promote “environmental protection”. The most fundamental solution for clothing textiles to satisfy the requirements of environmental protection is to choose environmental materials. New ecological clothing materials developed in these years cover continuous development and innovation of natural materials and regenerated fiber materials which have been substantially used in modern clothing design and promoted the development of modern clothing design toward the new concept of environmental protection. Property advantages of ecological and regenerated fiber materials will be introduced in this paper and its development and application in clothing design will be further illustrated.
Research and Application of Warm Extrusion Forming Technology for Internal Combustion Engine Piston Head
Authors: Yang Li Quan , Lv Qing Qing , Zhao Lei
Published: June 2013

In order to improve the performance of the piston head on the existing conditions, and the warm extrusion forming technology was put forward based on the internal combustion engine piston head traditional production process. The warm extrusion process scheme and finite element boundary conditions was designed reasonable based on research the piston head forming process, the thermal-mechanical coupling model was established. The numerical simulation of the warm extrusion forming was carried out on the DEFORM software platform. The distributions of warm extrusion forming process strain field, stress field and temperature field were forecasted through the theoretical calculation and simulation. And the production equipment tonnage and die structure form were determined preliminarily. The possible problems of forming process were discussed, and the countermeasures were also put forward, provide the reliable reference for internal combustion engine piston head forming process improvement.
Study on the Drying Mechanism and Dynamics of Palygorskite
Authors: Wang Shi Long , Wang Li Na
Published: June 2013

Palygorskite had large applications in chemical, environmental protection, medicine processes and so on. However, since the mineral limitations of natural palygorskite, both improving its quality and meeting the need of industry, palygorskite usually needs to be activated before using it. The influences of activation during the drying process were studied, as well as the drying kinetics of the non-activated of palygorskite. The results showed that the drying rate of palygorskite increased at first，and then came to a constant value, and kept that value for some time. After that, drying rate decreased with time going. Compared with drying curves of the non activated palygorskite, the samples made some changes after activation. The drying process of non activated palygorskite could be described as the equation of MR=exp(-ktn).The diffusion activation energy (E) of non activated palygorskite was equal to 17.14kJ.mol-1, former factors of Arrhenius was equal to 4.19×10-5 m2.s-1.
Comparative Study on Nonlinear Earthquake Response of Girder Isolated Bridges with LRB and Model Shaking Table Test
Authors: Zhan Jie Dong , Li Xin Tong , Li Yang
Published: June 2013

Abstract: The thesis is aimed to study the characteristics nonlinear seismic response of the isolated continuous girder bridges with LRB. Inorder to achieve the aim, force- deformation properties of the LRB is considered as bilinear first, the bouc-wen model is adopted to imitate the force nonlinear deformation behavior of LRB, and by using Finite element method, the motion equation of the Isolation system of continuous girder bridge is established, then some shaking table tests towards the model of isolated continuous girder bridges with LRB is done. On this basis of it, by comparing the experimental results and calculation results, such as the acceleration and displacement of deck, vertical force of bearing, and the relationship between the Isolation layer displacement and the Level force displacement of the Bearing, we can see that the difference between the analytical results and the experimental results are very small. The results show that the calculation method can analyze Nonlinear Seismic Response of isolated continuous girder bridges with LRB efficiently. But when the vertical earthquake component is larger ,whether the results of the Vertical tension are produced or not, designing the Rubber bearings should be considered.
Experimental Study of Self-Stressing and Static Load on Self-Compacting Concrete Filled Steel Tubular
Authors: Yuan Bo , Lu Zhean , Xiong Rui , Yuan Xiao Hui , Chen Wei Guo
Published: June 2013

In order to achieve the optimal interface composite properties between the inner wall of steel tube and the core concrete as well as evaluate the expansion properties of concrete filled steel tubular rationally, the mechanical properties of 5 CFST specimens were tested in this paper with different dosage of expanding agent measured from zero to 28d curing age. Besides, this research also examined the validity and accuracy of homemade concrete stress box. The result proved that the test results coincide with the calculated value of theoretical analysis perfectly, which provided experimental and theoretical basis for the expansion mechanism of self-stressing concrete in steel tube constraint and the designing goals of expansion properties in concrete filled steel tubular.
The Current Using Situation of SBS Modified Asphalt in China and a New Method of Monitoring SBS Modifier Dosage
Authors: Song Jia Le , Ye Chang Yong , Wang Bai Lin , Zhou Zhi Mi , Xiao Yan , Hao Peng Wei , Ye Chao Qiang , Li Wei Guang
Published: June 2013

The relationship between the SBS modifier types and asphalt components on the effect of modified asphalt properties was discussed in this paper. Higher block ratio, higher molecular weight and star-like structure of SBS can improve modified asphalt high temperature properties. Colloid content decrease leading the processing easier, result stability decline. Our research group invented a chemical titration combined with fluorescence microscopic analysis detection method monitoring SBS modifier dosage. This method applied in highway construction site, the effect is significant.
Accuracy-Complexity Trade-Off for the Signal Reconstruction of Multifunctional Sensors
Authors: Fan Xian Guang , Wang Xin , Wu Jing Lin , Zuo Yong
Published: June 2013

The on-chip signal reconstruction method based on B-spline approximation and Extended Kalman Filter (EKF) for multifunctional sensors has been studied previously. In this paper, we focus on the design for reducing the complexity of the reconstruction method without significant loss of reconstruction accuracy. The two-objective optimization design framework is proposed, where the reconstruction accuracy and complexity are considering as two conflicting costs to be decreased jointly. Genetic Algorithm (GA) is presented to achieve the accuracy-complexity trade-off by optimizing the B-spline structure parameters, i.e. the dimensions of knot vectors. The experimental results show that the proposed method provides a good improvement to the B-spline and EKF based on-chip signal reconstruction method.
An Echo-Based Gait Phase Determination Method of Lower Limb Prosthesis
Authors: Wang Wen Jun , Li Juan , Li Wei Da , Sun Li Ning
Published: June 2013

The gait phase determination is the basis of the control of intelligent prosthesis. The prosthetic usually determines the gait phase according to its own motion parameters, which will cause the asymmetry gait of the prosthesis wearer during level walking due to the lack of contralateral motion information. By using of a variety of sensors installed in the healthy leg and prosthesis, the gait phase determination method based on echo control can achieve good symmetry, but at the same time also made calculation difficult. Based on the existing echo method, a gait phase determination method by utilize of the contralateral motion parameters is proposed. According to gait test data collected from healthy subjects, motion parameters and their relation can be obtained. Then the proposed method can determine its gait phase and contralateral phase. Preliminary experiment is conducted and verified the effective of the method.
Application Research of ARM Embedded System in the Vision System of Chip Mounters
Authors: Teng Yong Hui , Zhou De Jian
Published: June 2013

Chip mounters are the important equipment on Surface Mounting Technology (SMT) production line, and with continuous improvement of the requirement on the mounting speed and mounting accuracy of micro-electronic components, high-speed and high-precision chip mounters have become important goals pursued by many companies and manufacturers of SMT equipment. As there is great difference in the shape, size, shape and number of pins of the components to be mounted by chip mounters, higher technical requirements on the mounting components identification and visual system must be put forward. The traditional mounter vision system controls and handles the light source system and the image acquisition system by personal computer (PC). However, in the practical application, the visual system has disadvantages such as large volume and high cost, which will lead to the shortcomings of bulky volume of the production equipment, inconvenient assembling, expensive price, difficult upgrading, etc. In this paper, to overcome these deficiencies of mounter vision system, based on the advantages of embedded system such as small size, fast response, reliable operation and relatively low prices, etc., the application of Advanced RISC Machines (ARM) embedded system in SMT machine vision system is researched, and the whole system and the module design is done with the modular design thought, which is conductive to the development and later maintenance, updating, and upgrade of the system.
Biped Walking Robot Gait Planning Research
Authors: Chen Hai Long , Wu Xiao , Du Jun , Tang Jin Ping
Published: June 2013

This paper uses biped walking robot as the research object, and designs robots original system, based on the requirements of Biped Walking Robot Competition of China. According to the biped walking robots characteristics of multi-joints, many degrees of freedom, multivariable, strong coupling and nonlinearity [, we can build system model using the Denavi - Hartenberg coordinate, describe the system model by the homogeneous coordinate transformation theory, and then plan on system gait based on ZMP stability . Finally, we can solve for the joint trajectory of the system by using computer-aided software.
Blind DOA Estimation Based on Single Acoustic Vector Hydrophone
Authors: Xiao Da Wei , Cheng Jin Fang , Zhang Jing Zhuo
Published: June 2013

In this paper a blind direction of arrival (DOA) estimation method based on single acoustic vector hydrophone is presented according to the characteristics of underwater acoustic waves. With no priori assumptions about the structure of steering vector, the vector hydrophone array manifold is estimated by the joint approximate diagonalization of eigen-matrices (JADE) algorithm. Simultaneously, acoustic waves are reconstructed by the separation matrix and signal vector. Finally, with the orthogonality of the components of particle velocity the DOA are estimated. Simulation experiment proves the effectiveness and correctness of this new method.
Design of a Portable Formaldehyde Meter
Authors: Meng Fan Shuo , Chen Ai Guo
Published: June 2013

This paper describes the design of a portable formaldehyde detector instrumentation which is based on the C8051F021 microcontroller. Using the Dart sensors for detection of formaldehyde and AD8571 precision operational amplifier for signal amplification, this meter will achieve real-time detection of formaldehyde in the air. The instrument's low power consumption, intelligent and portable features are suitable for the rapid detection of formaldehyde in indoor air.
Design of Fuzzy PID Controller Based on Adaptive Particle Swarm Optimization with Cloud Theory
Authors: Ying Ming Feng , Zai Li Xin , Wang Hai Xiang
Published: June 2013

Researching optimization problems of controller is need of industrial process control ,in which PID controller is widely used,which its parameters can be equivalent to optimization problems. In the industrial control the PID controller is widely used in excitation control system to improve its control performance.In order to find the optimal PID controller parameters effectively ,a kind of Adaptive Particle Swarm Optimization method (CAPSO) based on Cloud Theory is applied to fuzzy PID controller. Through the establishment of particle swarm algorithm of fuzzy PID controller parameters optimization model, which it can be used to optimize the membership function of fuzzy PID controller. Particle code adopts real coding. Particle dimension is related with the number of the input variables divided by fuzzy set and the number of control rules of whole fuzzy control system, thus the parameters of PID control are optimized on real time. The result from the simulation shows that compared with PID control and fuzzy control this system has several advantages which are small overshoots ,fast response ,and good stable performance to improve the control performance of excitation control system.
Design of Lightweight RFID Middleware for Warehouse Management System
Authors: He Hong , Xu Hong Yang , Zhang Zhi Hong
Published: June 2013

With the development of computer network automation and the rapid development of e-commerce, more and more enterprises need to update their own warehouse management system to adapt to the change of technology. RFID technology is widely used all over the society due to its rapid, real-time, accurate sampling and processing information ability. This paper applies RFID technology in the warehouse management system to put forward the lightweight RFID middleware architecture for the warehouse management system .According to the ALE standard launched by the EPC global, the paper mainly realizes the function of basic middleware which has the ability to receive and process data. Meanwhile, the middleware uses Mysql database to select useful things for application software system. The middleware designed in the paper is simple in structure and powerful in function which will do well for small and medium-sized enterprises.
Effect of Equal Channel Angular Pressing and Annealing on Corrosion Resistance of Cu-Zn Alloy
Authors: Fang D.R. , Liu F.F. , Liu Chun
Published: June 2013

Cu-32wt.%Zn alloy was subjected to equal channel angular pressing (ECAP) and subsequent low temperature annealing treatment, and the corrosion resistance of the samples was investigated by potentiodynamic polarization measurements in 3.5% NaCl solution. The results show that the corrosion rate of the ultrafine-grained alloy decreases, in comparison with the coarse-grained alloy. Meanwhile, it is noted that the corrosion resistance of the sample subjected to ECAP can be further improved by relief annealing.
Evolvement of Research in Impedance-Measuring Device for Structural Health Monitoring
Authors: Zhang Yu Xiang , Zhou Yun , Chen Shi Yi
Published: June 2013

tructural health monitoring based on piezoelectric technology has the features that are sensitive to early damage, insensitive to the environment, low cost and suitable for monitoring on-line. It has received more and more attention. In this thesis, the actualities of Impedance-based structural health monitoring are introduced for future reference.
Hardware Design of Microcomputer Relay Protection Device Based on ARM&DSP
Authors: Zuo Li Xia , Di Rong Guang
Published: June 2013

In order to ensure electrical railway’s safe and stable operation, a kind of microcomputer feeder protection device based on a double "ARM+DSP" CPU framework is designed. The hardware design can not only Improve protection performance, but also realize IEC61850 communication protocol. According to electromagnetic compatibility and anti-interference requirements, the whole hardware circuit is designed in detail, the debugging effect is good and can fully meet the demand of the system.
High Performance and Full Digitalization Design of Brushless DC Motor Control System
Authors: Wei Min , Wei Juan
Published: June 2013

In this paper, a fresh digital intelligent control system is designed. The overall project design, hardware principle and control strategy of the control system are presented particularly. The design scheme of the paper is tested and the sample has been manufactured, which shown that the system have such characteristics as small in size, simple construction, good portability, high reliability and stability and suitable for small power brushless DC motor control.
On Study of High Speed Permanent Magnet Synchronous Motor without Iron Core
Authors: Liu Ji Zhu , Wang Yang Jun , Chen Tao , Pan Ming Qiang , Chen Li Guo , Sun Li Ning
Published: June 2013

Iron loss will be rapidly increased when the permanent magnet iron core synchronous motor runs at a high speed, which makes the motor produce so much heat that causes low efficiency of the motor and even burns out the motor. The iron-core-free permanent magnet synchronous motor remedies this defect and has a high efficiency at high speed. This article makes a comparative analysis on the iron-core-free permanent magnet synchronous motor torque density with different slot engagement classifications. The paper puts forward an optimized model of permanent magnet synchronous motor without the iron core. The technology of the permanent magnet synchronous motor without iron core is studied based on this model which provides a method to design and manufacture the iron-core-free permanent magnet synchronous motor.
Progress in Lamb Wave Testing and Research Based on PZT
Authors: Zhang Yu Xiang , Chen Shi Yi , Zhou Yun
Published: June 2013

Lamb Wave testing based on PZT has features that are sensitive to plate thickness direction, low cost and suitable for long distance. It has received more and more attention. In this thesis, the principle of Lamb Wave testing method is introduced, research status and image processing technology is summarized, and future work is outlook.
Remote Localization of Underwater Magnetic Target
Authors: Huan Ying Chun , Lin Chun Sheng , Tan Bin
Published: June 2013

The model of remote underwater magnetic target was set up by the single magnetic dipole. A closed formula that describes the distributing of magnetic dipoles at arbitrary position was gained by means of extracting the transfer matrix. The location and magnetic moment equation of magnetic dipole was set up by using the formula. Then a calculation result for the location and magnetic moment of target at arbitrary position was acquired. The location method in this paper need not know the magnetic moment of target in advance, so it provides a new practical method for the remote location of underwater magnetic target.
Research on Visualization of Cutting Tools' Wear Measurement of Shield
Authors: Guo Jing Bo , Zhang Ning , Liu Jin Zhi , Niu Jiang Chuan
Published: June 2013

In this paper the principle and method of the ultrasonic thickness measurement are introduced, and a kind of thickness measurement system based on single chip microcomputer is set forth, which is used for shield cutters’ wear measurement. besides, the collected data is processed by way of MATLAB software which can display the intuition image of the present situation of the tool wear and provide the reliable guarantee for real-time detection of the cutting tool.
Self-Identification Method and Application of Measuring Equipment under Conditions of Close Arrange Stations
Authors: Qian Ke Chang
Published: June 2013

An effective method to improve and self-identify equipment measured precision is the method of error model best estimate of trajectory(EMBET).Under circumstances of several sets of photoelectric, radar equipment involved in measurement, correlation of error model coefficients was enhanced, accuracy of self-identification and orbit determination was dropped because of close arrange station. This paper uses a method of EMBET based on principal components estimate, and a method of screening method of optimal characteristic roots based on function of residual sum of squares to improve the efficiency of the characteristic root screening, the morbid phenomenon of matrix inversion was effectively eliminate, and the accuracy of self-identification and orbit determination was improved.
Study of the Secondary Phases in Inconel 718 Aged Superalloy Using Thermodynamics Modeling
Authors: Caliari Felipe Rocha , Guimarães Nara Miranda , Reis Danieli Aparecida Pereira , Couto Antônio Augusto , de Moura Neto Carlos , Candioto Kátia Cristiane Gandolpho
Published: June 2013

The evaluation of stability of secondary phases in superalloys is of great importance because of its application under high homologue temperatures. The precipitation hardening Inconel 718 superalloy has high stress rupture and creep resistance, good LCF behavior and high corrosion resistance. Those properties can be obtained due to the high stable matrix based on Ni, Fe and Cr, as well as secondary phases promoters elements such as Ti, Al and Nb. This study aims to analyze the phase stability among a range of temperature from 500°C to approximately 1400°C. The thermodynamic modeling has a high importance to predict the behavior of alloys among equilibrium transition. The microstructure of the system was evaluated using Thermo-Calc software and the selected databases: SSOL4 and TTNI6. This analysis made possible the prediction of the phases presented, compositions and amounts. Results from SEM analysis were used to compare the results obtained, showing good coherence between them.
Influence of Oil Lubrication and Heat Treatment on Wear Resistance of Thermally Sprayed Molybdenum Coating
Authors: Laribi M. , Vannes A.B. , Treheux Daniel
Published: June 2013

To date, efforts forwarding to develop thermal spray coatings technology have been focused on increasing the durability and integrity of the coating. Improvement of mechanical characteristics such as wear resistance of the deposit, minimizing residual stress levels and reducing porosity are the main objectives of these works. The specific aim of this paper is to determine the wear resistance of molybdenum coating thermally sprayed on a steel substrate. This behavior has been determined using a simple ball-on-plate tribometer. Attention was given on the influence of a post-annealing at 850°C for one hour in vacuum and oil lubrication conditions.
Graphene Nanoribbon Based Gas Sensor
Authors: Kiani Mohammad Javad , Ahmadi M.T. , Akbari E. , Karimi H. , Che Harun F.K.
Published: June 2013

Mono layer graphene (MLG) as a new kind of advanced material is in our focus. MLG indicates a twodimensional structure with quantum confinement effect in its thickness. The MLG based nanomaterial has remarkable potential on electrochemical catalysis and bio-sensing applications. Recently inter sheet sensing systems for graphene sensor have been reported which will be used in our model as well. We provide a new idea of electrochemical sensors based on the graphene application. In this paper carrier the concentration on the sensor as a function of gas concentration is reported. A field effect transistor (FET) base structure as a modeling platform is proposed. Gate voltage representing the gas concentration on the sensor, or in other words the gate voltage as a function of gas concentration can be employed. Finally the proposed model is used in simulation studies and evaluated by experimental result.
Improvement of the Adhesive Wear Resistance and Mechanical Properties of Low-Carbon Steel by Solid Carbonization
Authors: Dabo M. Noor. I. , Aldlemey M.S.
Published: June 2013

Wear is one of the problems that occurs in moving parts, whether rolling or sliding. Since the wear resistance is closely linked to the hardness of the involved surfaces, this research studies the possibility of increasing the hardness of low carbon steel, which is used extensively because its ductility and its shock resistance and being one of the inexpensive metals. A lot of mechanical parts require an external hard surface, resistant to wear, and at the same time high resistance to shocks. The main hardening process used in this research is the increase of the carbon proportion on the external surfaces of the equipment made of low carbon steel and thus, to make the heat treatments necessary to obtain the required properties of these surfaces such as hardness and high resistance to shocks. The study of the process of carbonization by using the solid carbonization as one of the ways of hardening the surface at temperatures in the austenite range of low carbon steels give an impression about the possibility of improvement in the qualities of hardness and resistance to wear. In order to obtain a variable thickness of the carbonated layer, a carbonization process was performed at different temperatures and times to demonstrate the effect of these two important factors to the amount of diffused carbon to the surface of the solid and thus the extent of its influence to obtain the required properties of the process. The mechanical and microscopic tests conducted on samples proved the success of the carbonization process to achieve the purpose and goal of the preparation of this paper. Finally experimental results have shown good correlation between the wear resistance and mechanical properties with temperature and carbonization time. The analysis of the variance of the results in this study indicated that the best mechanical properties are achieved when one performs the process of carbonization at 975°C for 20 hours.
Cladding of Advanced Al Alloys Employing Friction Stir Welding
Authors: van der Stelt A.A. , Bor T.C. , Geijselaers Bert , Akkerman R. , van den Boogaard Ton
Published: June 2013

Friction stir welding (FSW) is a relatively new solid-state joining technology for metals. It shows no solidification-related joint imperfections which makes it utmost suitable for hard-to-weld highly alloyed aerospace aluminium grades, like AA 2xxx and AA 7xxx. These alloys are often cladded with a thin layer of pure aluminium for corrosion protection. Friction stir welding of such materials requires removal of the clad layer prior to welding to prevent weakening of the joint by the soft clad material. This leaves the welded region vulnerable to corrosion after the joining process. Post-weld restoration of the clad layer is required to restore the protective action of the clad layer and as such to enhance the life expectancy of the welded construction. In this work the deposition of thin layers of pure aluminium on AA 2xxx and AA 7xxx alloys is studied employing an innovative FSW tool. The tool shoulder is equipped with strategically placed internal channels that allow delivery of filler type of material into the weld zone. Depending on the channel architecture used, filler material can be deposited on top of the work piece surface and/or mixed with the work piece surface region. The cladding is done in the solid state avoiding many problems with solidification and interface reactivity often observed with other surface modification techniques, such as laser surface engineering, plasma spraying or casting. Here, the filler material is deposited on top of the work piece; the modified tool is not equipped with a tool pin. The work comprises an in depth study of the influence of process conditions on the microstructural changes in the underlying work piece and on the quality of the bonding of the clad material (99.5 % aluminium) to the work piece material. Apart from the usual process conditions, such as tool rotation speed, translation speed, down force and tool angle also the delivery pressure and rate of the filler supply system can be varied. The influence of the usual process conditions on the microstructure of the underlying work piece is similar to that observed with “traditional” FSW. Changes in hardness can be related to the amount of heat generated by the welding process. Shape and dimensions of the microstructural zones found are typical for welds made without a tool pin. The effect of the small amount of clad material deposited on top of the work piece on the temperature distribution is small. The amount of heat required to heat it up is negligible to the heat required to heat up the work piece and the tool. The quality of the bonded clad layer is dependent on the amount of heat and plastic deformation generated at the interfaces between the tool, the filler material and the work piece. Tool angle, tool shape and supply rate of the filler supply system determine the layer thickness.
Influence of Parameters in a Hybrid Joints (SPR/Bonded) GFRP-Aluminum
Authors: Di Franco Giuseppe , Fratini Livan , Pasta Antonino
Published: June 2013

Self-Piercing Riveting (SPR) is receiving more recognition as a possible and effective solution to join body panels and structures. For example self-piercing riveting is still the first choice for the most well-known automotive car industries when considering the intensive use of aluminum alloy. To combine the advantages of the two joints techniques, in the last years hybrid joints combining a classical mechanical fastening (riveting) and a classical adhesive bonding, or a co-cured joint, have attracted great interest.In the present paper the static behavior of single-lap hybrid joints (SPR-bonded) between GFRP and aluminum through experimental tests. In particular, tensile strength, energy absorption and failure modes of studied joints were investigated through tensile tests.
Crystal Plasticity Modeling of the Through-Thickness Texture Heterogeneity in Heavily Rolled Aluminum
Authors: Delannay Laurent , Mishin Oleg
Published: June 2013

Textures of rolled sheets are typically orthotropic along the mid-thickness plane, where the material undergoes plane strain compression. At the surface and in the subsurface layers, however, the achievement of the orthotropic symmetry can be impeded due to friction between the sheet and the rolls. The through-thickness strain distribution and texture have been found to also depend on the rolling draught [1], the load exerted on the rolls, the temperature and the rolling speed. Valid predictions of the influence of the shear deformation on the development of the microstructure and texture are not only important for controlling structural characteristics of the as-deformed material, but are also a pre-requisite to the investigation of the recrystallization process upon annealing. A recent experimental study of the texture development in heavily rolled aluminum revealed that the texture in each subsurface layer was dominated by one of the symmetric variants of the “copper” component. To investigate the conditions under which such variant selection is expected, a crystal plasticity theory combined with several mean-field as well as full-field scale-transition schemes is applied in the present work. Model predictions are compared to the texture development measured by EBSD in samples rolled to high and ultrahigh strains.
Activation Energy for Hot Deformation of 15-5 PH Stainless Steel
Authors: Muñoz-Andrade Juan Daniel
Published: June 2013

±Abstract. By applying the new quantum mechanics and relativistic mathematical model, proposed by Muñoz-Andrade, on the experimental results reported previously by Aghaie-khafri and Adhami [5], the true activation energy for hot deformation of 15-5 PH stainless steel is obtained over the temperature range of 900-1150°C and strain rates varying between 0.001 and 0.5s-1. It is interesting to contrast the results of this theoretical work with the main results of the apparent activation energy obtained for the same data, but applying the common methodology. It is shown that the true activation energy increased as the hot deformation is increased. Moreover, the true activation energy decreased as the strain rate is increased. The mean value of the true activation energy (289 kJ/mol) at high strain rate, ξ=0.5s-1, for dynamic recrystallization over the temperature range of 900-1150°C is in a closed agreement with the value of activation energy for self-diffusion in γ iron (280 kJ/mol) in dissimilarity of the result of the apparent activation energy (49221 kJ/mol) obtained beforehand by Aghaie-khafri and Adhami [5]. The results obtained in this work by the quantum mechanics and relativistic mathematical model are widely satisfactory; because essentially they are over the crucial limitations of the common methodology to obtain the activation energy at each thermo-mechanical metalworking condition. Keywords: Activation Energy, Hot Deformation, Dynamic Recrystallization, Quantum Mechanics, Special Relativity Theory.