bluuebunny/crossref_metadata_2025 huggingface dataset:
Thermodynamics Analysis of Microalloying Technology for Developing High Strength Cold Rolled Structural Steel Sheet
Authors: Ma Chun Yu , Wang Chang , Shen Ke Ya , Yuan Jun Ping
Published: September 2013

According to thermodynamics of materials, selection of microalloying composition for developing cold rolled structural steel sheet with different strength levels was investigated, by comparing and analyzing the solid solubility and lattice constant of microalloying elements V, Nb and Ti, ideal microalloying composition-niobium and titanium compound additives was obtained, and then process parameters including reheating temperature and annealing process were discussed.
Design and Experiment on Flank Type of Cropland Plot Breeding Wheat Drying Car
Authors: Dai Fei , Zhao Wu Yun , Zhang Feng Wei , Han Zheng Sheng
Published: September 2013

In order to meet the drying demand of breeding wheat in China, the flank type of cropland plot breeding wheat drying car was designed, which was equipped with the solar collector automatically adjusting device and ensured that with the sun azimuth maximum angle of radiation, increased heat collecting efficiency in effective time. Used alternate partition drying storehouse and double duct W type corrugated plate collector to increase the effective contact time and heating effect about dry hot air with the breeding wheat, so improved the drying efficiency of wheat seed. The test results showed that the flank type of cropland plot breeding wheat drying car could easy to move within the cropland plot, when conducive to the breeding wheat drying operations, the average drying rate was 1.471%/h, and compared with the traditional drying methods, the average drying time was relatively reduced by 36.4%.
Design and Research of Wind Tunnel Test for Deflectable Nose
Authors: Zhang Bo , Wang Shu Shan , Cao Meng Yu , Xu Yu Xin
Published: September 2013

A wind tunnel test is designed to study aerodynamic effects of one individual rocket with deflectable nose. The test measures pressure with U-bend tube which is cost effective. Using rubber tubes in different lengths to measure pressure distributions of a flat-plate, and calculating how rubber tube affects the measurement, in order to modify the measured surface pressure of the nose. The surface pressure varies on different points while yawing angle and attack angle changes, the changing regularity could provide data for following numerical simulation and trajectory control.
Optimal Design of the Fluid System on Special Fuel Filling Equipment
Authors: Yang Chu Chun , Li Wei , Ye Yong , Shen Gang
Published: September 2013

To realize miniaturization design for special fuel filling equipment, based on analyzing workflow of special fuel filling equipment, an optimal scheme of the fluid road system is put forward aiming at requirement of the fluid road system. By multi-function pump, bothway metering device and the three-way electric valve,fluid road flow is built, which could realize forward and backward working and bothway output. Under the premise of ensurfing the technical technical support task, fluid road flow is optimized and service efficiency is improved, which lays a technical foundation for realizing miniaturization design of the filling equipment.
The Applied Research of the Super Capacitor in the Maximum Power Tracking of Photovoltaic Systems
Authors: Guo Yun Bo , Ren Xin
Published: September 2013

Through analyzing the working principle of the technology of maximum power point tracking in the photovoltaic system, the maximum power tracking circuit is designed. In the hybrid energy storage devices of the super capacitor and battery, the super capacitor is a secondary storage device. Through photovoltaic controller is connected with the photovoltaic cells, photovoltaic cells can achieve the status of the maximum power point tracking. Through the bi-directional DC-DC converting circuit connecting with the battery, the battery can effectively decrease the times of the charging and discharging and works stably. It improves the working efficiency and life of the system.
Effect of Load on the Tribology Behavior of Cu-Based Self-Lubricating Composite
Authors: Zheng Run Guo , Zhang Xin Xing
Published: September 2013

Sliding wear behavior of the (NbSe2+SiC)/Cu composite was studied on a pin-on-disc wear tester under various electrical currents and applied loads. The worn surfaces were characterized using scanning electron microscopy and energy dispersive spectroscopy to probe the wear mechanisms. Experiment results show that the friction coefficient and wear rate of (NbSe2+SiC)/Cu composite increased with increasing of the normal load. Adhesive wear, abrasive wear and fatigue wear were the main wear mechanism during the sliding process.
Hybrid Algorithm for Face Recognition Using an Evolutionary Software Engineering
Authors: Vargas Hector , Martinez Aldo
Published: September 2013

The principal aim was the construction of a face recognition system in order to be implemented in the service robot Donaxi, delimited by the Who is who test which is part of the RoboCups tests set, using an evolutionary development strategy of triple iterations. A two phase hybrid algorithm was developed, the first phase aim was the face detection using the Haar classifiers for face search in an image and the second phase is based on a decision tree whereby the faces characteristics were evaluated by the comparison techniques of phase correlation and histogram comparison. The needed characteristics were identified in order to develop this work as a software engineering project which allowed the algorithm construction and implementation through an evolutionary approach and a personal development process. The evolutionary strategy allowed the prototyping development with functionality and the tracking of the final system construction. A three iterations total was realized during which the needed metrics were registered (time, defects and sizes). The final analysis of results (algorithm and methods) allowed concluding and visualizing the employment advantages of a software engineering formal technique for research and robotics projects realization when improving estimations and software production quality.
The Design of High-Precision Temperature Measurement System Based on C8051F350 and PT100
Authors: Liu Long , Zhang Yun Cui , Hua Shen , Xiao Jun , Huang Li Jia
Published: September 2013

This article describes the design of High-Precision Temperature Measurement System based on C8051F350 and PT100. The system consists of the control circuit, temperature sensors, signal amplification circuit, field bus interface circuit. The system adopts constant current source method and a differential measurement circuit. A 24-bit A/D built in the CPU is used to sample the data and Non-linear compensation by software algorithms for it. The design improves the accuracy of the temperature measurement system.
Research on Optical Properties of Ga1-xAlxN with Different Al Component
Authors: Yang Ming Zhu , Guo Jing , Wang Mei Shan
Published: September 2013

As advanced semiconductor materials, Ga1-xAlxN alloys are widely used. In order to research the optical properties of Ga1-xAlxN with different Al component, we built models of GaN, Ga0.875Al0.125N, Ga0.750Al0.250N, Ga0.625Al0.375N, and AlN, and calculated the optical properties of the five crystals based on first principle calculations. Results show that the static dielectric constant decreases when the Al component increases, and the absorption peak shifts to higher energy. The threshold wavelength of Ga1-xAlxN is lower and lower when the Al component increases, and the Ga1-xAlxN material owns “solar blind” property when the Al component is higher than 0.25.
Automatic Point Clouds Registration Method Based on Mesh Segmentation
Authors: Fan Li Hua , Liu Bo , Xie Bao Ling , Chen Qi
Published: September 2013

This paper proposes an automatic point clouds registration method based on High-Speed Mesh Segmentation. The proposed method works fast for doing an initial registration and extracting point clouds region feature. First, the features of the point region are used for matching point cloud regions. Second, matched regions sets are classified for calculating transform matrix of initial registration. Based on the initial registration result the Iterative Closest Point (ICP) algorithm which had been used for accuracy registration to composite point cloud pairs will be applied. The proposed registration approach is able to do automatic registration without any assumptions about their initial positions, and avoid the problems of traditional ICP in bad initial estimate. The proposed method plus with ICP algorithm provides an efficient 3D model for computer-aided engineering and computer-aided design.
Ceramic Microstructure Image Segmentation by Mean Shift
Authors: Cai Hua Hui , Cheng Yan , Liu Bing Xiang
Published: September 2013

In order to effectively assist the researchers conduct quantitative analysis of ceramic microstructures, a segmentation algorithm based on mean shift is used for the ceramic microstructure image. Since the collection and transfer process of microscopic image will inevitably be subject to uneven distribution of light, electronic noise and other interference factors which make the image quality deterioration, it is necessary to reduce noises and enhance edges for ceramic microscopic image processing at first. Therefore, the median filter is used to remove the noises in the ceramic microstructure images. Then the component with similar feature is separated and merged by the mean shift segmentation algorithm. Experiments show the proposed algorithm of using median filter and mean shift clustering gives satisfactory results.
An Insect Song Signal Feature Extraction Method Based on the Wavelet Packet Analysis
Authors: Xie Jun , Wang Hong Wei , Zhao Mei , Yang Kai Yu
Published: September 2013

The wavelet packet decomposition method was used to two common insects song signal. Frequency decomposition and feature extraction were made, the feature vectors, eigenvalues and the sound quality evaluation parameter vectors were constructed, then the correlation analysis calculation were made between the eigenvalues and the sound quality evaluation parameter vectors. The results show that the correlation coefficients are good, the average correlation coefficients of cricket and grasshopper song signals are 0.8875 and 0.6942, the results of cricket is much better than grasshopper, it proved that the proposed algorithm is more suitable for cricket song signals analysis, a new and effective sound quality evaluation method for typical insect with friction sound mechanism is provided.
Remote Communication System for Transmission Line Monitoring Based on CMA
Authors: Wang Wei , Deng Hui , Shen Wen , Yao Qi Gui , Wang Xiang Qun
Published: September 2013

This paper studied application of fiber-optic and wireless communication technology in remote communication system for transmission line based on CMA and proposed the typical design scheme for different applications. The design of CMA which realized monitoring data centralized and upload had been given. The remote communication system used OPGW communication scheme had been constructed and run well, which has important significance for the construction of transmission line monitoring system.
Design of Outdoor Unit for Wireless Microwave Transmission System
Authors: Huang Bin Wen , Jiao Yuan
Published: September 2013

As a high-frequency, broadband wireless transmission system, wireless microwave transmission system is still paid attention by the whole world. The construction and function of wireless microwave transmission system is introduced in this paper. This paper focuses on the design of outdoor unit for wireless microwave transmission system.
A New Routing Method Based on Hybrid Algorithm
Authors: Chen Jian Hui , Tang Yu Lan
Published: September 2013

A new routing algorithm is proposed for FPGA to improve the increasing transformation cost of pseudo-Boolean Satisfiability algorithm in the routing process. The approach combines advantages of pseudo-Boolean Satisfiability and geometric routing algorithm. First, Frontier-one of geometric routing algorithm is chosen for FPGA routing. Then pseudo-Boolean Satisfiability algorithm is used when the process of Frontier is not successful. Technique of static symmetry-breaking is also adding to carry out pretreatment of pseudo-Boolean constraints, detecting and breaking the symmetries in the routing flow. The advantage is that the search path is pruned, and the cost is consequently reduced. Preliminary experiments results show that the hybrid method have no adverse affect on overall program. It has also reduced the runtime observably, and sped up the solving process.
Complete Design of Circuit Board Based on Altium Desinger Summer 09
Authors: Zhang Li , Peng Xiao Feng , He Li , Wan Wen Lue
Published: September 2013

Altium Desinger summer 09 is a circuit board design software with more perfect software function, quick operation and strong rationality. To make the beginner grasp the PCB design process well, this paper will describe the whole process and analyze every step with a circuit example
Algorithm Design of Gravity and Magnetic 3D Parallel Inversion Based on Multithreading Technology
Authors: Wu Wen Li , Liang Meng , He Wei
Published: September 2013

To design parallel algorithm for gravity and magnetic 3D forward and inversion, we used multithreading technology. Calculation process was decomposed into two major parts: forward program and inversion program, and the amount of two-part calculation can be equally distributed to computing threads. The results show that algorithm can increase calculation efficiency, and this process is reliable and efficient.
Real-Time Solution of Inverse Kinematics for 6R Robot Manipulators Using Digital Signal Processor
Authors: Chen Lin , Pan Hai Hong , Mao Han Ling
Published: September 2013

It is a challenge to get real-time solutions for the inverse kinematics problem of 6R robot. In this study, a digital signal processor (DSP) was adopted as the central processor for the algorithm inverse kinematics. Based on it, the robot end-effector carried out the interpolation of point-to-point spatial straight line, and the inverse kinematics solving of 6R robot manipulators end-effector was achieved. The deflection variations of the 6 joints were acquired during the interpolation in a Cartesian coordinate. The results show that inverse Kinematics solution for each interpolation point only cost 0.06588 millisecond using DSP 6711. This hard structure can ensure the real-time performance of control for robot and content the real-time control performance expected of industrial manipulators.
Research on the Double-Loop Robust Control Technology for the Electric-Hydraulic Servo System
Authors: He Tian Peng , Li Shu , Li Xiao Long
Published: September 2013

With the electro-hydraulic servo mechanism is more and more widely used in aerospace, manufacturing industry and agricultural machinery, its control performances are required by process environment with more and more expectations, which include increasing response speed and improving tracking accuracy. Because the traditional PID controller possesses large overshoot, long conversion time, bad robustness and other shortcomings, the double-loop robust control algorithm is proposed. Simulation results show that, compared with traditional PID control scheme, the proposed control scheme can achieve accurate tracking of electro-hydraulic servo system quickly. Therefore, it enhances product performance, optimizes the design process, and also possesses a high application value.
Project Donaxi@HOME Service Robot
Authors: Vargas Hector S. , Olmedo Edson , Martinez Aldo Daniel , Poisot Victor , Perroni Agustin , Rodriguez Andres , Granillo Omar , Merino Carlos , Peto Carlos , Antonio Wesli , Carbonel Carlos , Orozco Aldo
Published: September 2013

Donaxi is a prototype to improve their different capacities in the area of service robotics. This paper describes the functional architecture design and the different modules that integrate it of the service robot Donaxi of UPAEP. Novel results are presented here in the area of face recognition; we propose theHybrid Algorithm to Human-Face Detection and Tracking UnrestrictedandIdentification of People on the Floor Due to a Fall or Other Accident. The robot Donaxi is used as a vehicle for research in control of movement and human-robot interaction. The at Home League of RoboCup provides an ideal tested for such aspects of dynamic in motion indoor, skills to manipulate objects, aptitudes to intergesticulate with the persons in natural language and more. A modular software architecture as well as further technologies have been developed for efficient and effective implementation and test of modules for sensing, planning, behavior, and actions of service robots.
Research and Implementation of Speed Controlling Algorithm on Intelligent Racing Car
Authors: Dong Zeng Wen , Zeng De Quan , Liu Ji Zhong , Xiong Gen Liang , Ou Hai Yan
Published: September 2013

The key technology of controlling intelligent racing car is speed control. Currently contestants mainly employ the experience of control algorithm to control the speed. Intelligent car modeling and theoretical analysis of the algorithm will help to improve the controlling effect. This paper, on the basis of mathematical modeling of the intelligent car and simulation comparison, sums up the advantages and disadvantages of the algorithms, and finally accomplished the algorithm. The research provides the theory basis and experimental reference for improving controlling of intelligent racing car.
Applicability Study on Simulating Interference of Mixed Traffic at Signalized Intersections Using VISSIM
Authors: Li Cheng Hua , Li Shan Shan
Published: September 2013

The applicability of the interference of mixed traffic of VISSIM is inspected indexed by the rate of interference, delay and the average speed of right turn vehicles. This paper took Jiaoda east road and Xueyuan south road intersection (Hereinafter referred to as Sidaokou) as an example, established the simulation platform. Then the actual running condition of vehicles and simulation results were compared. The error between the measured values of each index and simulation values are in the range of 20%, which shows that it is applicable to use the simulation software VISSIM to simulate the interference between mixed traffic at signalized intersection.
Facial Diagnosis of CHB Clinical Syndromes Based on Computer Technology
Authors: Wang Zhi , Zhou Rui , Li Fu Feng , Qian Peng , Sun Zhu Mei
Published: September 2013

To objectively describe the facial features of different clinical syndromes of chronic hepatitis B (CHB) with the computer visual and extraction technologies and analyze the changes of facial indexes in facial diagnosis of Traditional Chinese Medicine (TCM). Methods: We used Chinese medicine face consultation digital detection system to acquire face-on photos and analyze the complexion and gloss features. Results: (1) Compared with the normal people, the patients with CHB have different facial indexes. (2)There are differences for facial indexes of patients with CHB of varied clinical syndromes. Conclusion: We extracted objective facial indexes by computer technology, which is a useful method for clinical diagnosis of disease and provides a new thought and method for TCM diagnosis.
Correlations of Bcl-2 and Survivin Gene Protein Expressions in Colorectal Cancer
Authors: Ma Yue , Wang Hong Sheng
Published: September 2013

Objective: In this study, immunohistochemical streptavidinbiotin-peroxidase (S-P method) was used to detect the correlation of gene proteins related to apoptosis, such as Bcl-2 and Survivin in colorectal carcinoma. Methods: Pathological specimens from 46 colorectal cancer patients and 8 normal tissues around the tumor specimens were selected. Immunohistochemical streptavidin-biotin-peroxidase assay was used to detect the expression of Bcl-2 and Surviving protein. Results: In 25 cases of Bcl-2 positive expression, there were 24 cases of Survivin positive expression, accounting for 96%; while there were 8 cases of Survivin positive expression in 21 cases of Bcl-2 negative expression, accounting for 38.1%, showing the expression of Bcl-2 and the expression of Survivin was positively correlated (Pearsons R= 0.627, P<0.01). In 15 cases of well-differentiated colorectal cancer tissues, there were 6 Cases of Survivin positive expression, and the positive rate was 40%; in 17 cases of moderately differentiated colorectal cancer tissues, there were 17 cases, and the positive rate was 100%; in 14 cases of poorly differentiated colorectal cancer tissues, there were 9 cases, and the positive rate was 64.29%. The statistical analysis showed that the Survivin positive expression in the three colorectal cancer tissues presented a significant difference (P <0.01). Results: The positive expression of Survivin protein was directly correlated to that of Bcl-2, which suggested that both of them acted on different stages of apoptosis to promote jointly the development of colorectal cancer in a synergistic way.
An Electrolyte Additive for Use in High-Voltage Lithium-Ion Batteries
Authors: Liu Ai Fang
Published: September 2013

A new compound was successfully synthesized as an additive in electrolyte used for high-voltage lithium-ion batteries, owing to its unique structure with the sulfone group that can increase conductivity and broaden the electrochemical window of existing electrolyte. Its lowest unoccupied molecular orbital (LUMO) is-2.686 eV, respectively. The lower LUMO value results in formation of solid electrolyte interface (SEI) film on anode surface which is prior to other solvents and can impede the electrolyte composition. Through the electrochemical test, the electrolyte having this additive (0.2 wt%) showed wider voltage window, enduring the potential up to 5.5V higher than that of 4.8V performed by available commercial high-voltage electrolytes. The additive to electrolyte was effective not only for Li/Li3V2(PO4)3 cell but also for Li/LiMn2O4 cells with a cut-off range of 3.0-4.8 V.
Quasi-Static Out-of-Plane Compression of Hollow Integrated Woven Textile Sandwich Composites
Authors: Su Wei , Xiang Yong , Jiang Yi Fan , Huang Shi Qing , Fan Hua Lin , Liu Ren Huai
Published: September 2013

In order to investigate the anti-crush properties and the corresponding deformation mechanism of hollow integrated woven textile sandwich composites (IWTSCs), the quasi-static out-of-plane compression experiments are carried out. A set of typical deformation curves with a relative stable deformation plateau are obtained. The coupled compression-shear deformation and the ductile failure mechanism of IWTSC is discussed. Combining with qualitative analysis, comparisons between three kinds of IWTSC panels with piles of different density and thickness reveal the key to design a ductile IWTSC.
Simulation Experimental Study on the Permeability of Coal Rock in Deep Mine
Authors: Zhou Gang , Yu Yan Bin , Cheng Wei Min
Published: September 2013

By means of MTS electro-hydraulic servo system, specimens from deep coal mine rock are conducted the permeability characteristics experiment under the condition of the stress-strain process and high pore-water pressure, also the results show that both the permeability rate and volumetric strain curves are V shaped, which link the dynamic changes of the microscopic fracture porosity and corresponds with the stress-strain. Meanwhile, under certain external conditions, whether the change of the pore-water pressure can improve the permeability properties or not, it depends on the critical threshold, moreover, the permeability properties under pore-water pressure higher than critical threshold have been improved several times than that at low pore-water pressure, and the peak of strain-permeability rate has a corresponding change with the peak of stress-strain curve, which shows a hysteretic characteristic. The higher the pore-water pressure is, the lower peak strength is needed, the more distinctive effects of dilatation emerge, and the more strain is needed for the appearance of permeability peak, This article provides the basis for the employment of high pore-water pressure to improve the permeability and disaster prevention of coal rock water injection.
The Structure and Mechanical Properties of Me/MeN/TiAlN Trilaminar Coatings Deposited by a Hybrid PVD Coating Technique
Authors: Xian Guang , Zhao Hai Bo , Fan Hong Yuan , Du Hao
Published: September 2013

The purpose of this study is to investigate the microstructure, mechanical properties and adhesion of Ti/TiN/TiAlN and Zr/ZrN/TiAlN trilaminar coatings, which were deposited on the high-speed steel substrate and cement carbide substrate by a hybrid PVD coating technique. X-ray diffraction technique (XRD) was used to reveal the structure of coatings. The fracture appearance of coatings was presented by scanning electron microscopy (SEM) and the element content was characterized by energy dispersive X-ray (EDX). Hardness and Yong's modulus were measured by using a nanoindentation technique and the adhesion of coatings was carried out with Rockwell HRC indentations. The results showed that all the coatings present a fcc B1 (NaCl type) structure and the TiN (111) is the dominant orientation. The TiAlN coatings with Ti/TiN interlayer presented a typical columnar structure, while the columnar structure became ambiguous in TiAlN coatings with Zr/ZrN interlayer. The chemical composition of TiAlN coatings is almost unacted on the inner interlayer. The hardness of the coatings on CC substrate is greater than that of on HSS substrate. However, the Ti/TiN/TiAlN coatings on HSS substrate has the maximum theH3/E*2ratio at 0.178 with a lowest hardness. The adhesion of Ti/TiN/TiAlN and Zr/ZrN/TiAlN coatings on CC substrate is remarkable greater than the adhesion of same coatings on HSS substrate.
The Protective Effect of the Intumescent Coating on the Fire Resistance Performance of Cable
Authors: Wang Ji , Song Wen Hua , Shu Zhong Jun , Zhang Miao
Published: September 2013

The failure time of polyvinylchloride (PVC) insulated power cables was studied using an infrared radiation heating furnace and insulation resistance measurements. The temperature-time curve inside the furnace was similar to that of the ISO 834 standard. Two popular fire protection methods were employed for the cables; one method applied fire-retardant coatings directly on the cable surface, and the other inserted the cables into metal conduits coated with structural steel fire-retardant coating. The results showed that for both protection methods, the failure time of the cable increased with the thickness of the coating. However, if the cable coatings were thicker than 1.5 mm, the coating will crack in the case of cable movement. When the steel structural coating was thinner than 1 mm or thicker than 3 mm, the protective effect was not remarkable for the relatively small expansion multiple. For the longest failure time of the cables, less than 10 minutes in these tests, neither of the two methods was effective in protecting the electrical cables that supply power (on transmit a signal) to equipment required to operate over a relatively long duration in fire conditions.
Detecting Cold Weld Defects in HDPE Piping Thermal Fusion Welds Based on Microwave Technique
Authors: Pan Jin Ping , Zhu Xin Wei , Tan Lian Jiang
Published: September 2013

In the present paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipelines based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds containing cold weld defects caused by insufficient heating time were examined by frequency sweep within the range of 9.2-9.9 GHz. At the frequencies that were most sensitive to the cold weld defects, the measured reflection coefficient S11 showed greatly different values between the good weld and those containing cold weld defects. The readily detectable differences in S11 value make the detection of the cold weld defects possible and feasible. This work provides insights for non-destructive testing of technical defects in HDPE piping welds.
Analysis of Low Molecular Weight Components in Disposable Food Contact Materials
Authors: Chi Hai Tao , Liu Wei Li , Hu Guang Hui , Gao Xia , Zhao Ting , Zhou Ming Qiang
Published: September 2013

Harmful low molecular weight substances in fifteen commercially available disposable cups were qualitatively analyzed. Contents of several suspected low molecular weight substances containing 2,6-Di-tert-butyl-4-methylphenol,Oleamide, Dibutyl phthalate in 15 disposable cups were quantitatively analyzed. The amount of igration of low molecular weight substances (DBP) in three food simulants was analyzed.
Efficient Analysis of the Electromagnetic Energy in Dispersive Composite Materials
Authors: Tan Kang Bo , Song Yi Chao , Su Tao , Fan F. F. , Lu Hong Min
Published: September 2013

This paper presents an analysis for electromagnetic energy in dispersive composite media based on classical electrodynamics. An investigation of the relation between reactance rate and electromagnetic energy derived from the Fosters theorem is conducted. The material energy of this kind is discussed in the frequency band of the left handed property. It is illustrated that the time average electromagnetic energy density is still positive even after an effect of dissipation is cancelled in the left handed band, which is reasonable in physics.
Effects of Air Bending Parameters on Spingback Using Finite Element Analysis
Authors: Li Xie
Published: September 2013

Springback is a common phenomenon in air bending of sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading. It has been recognized that springback is essential for the design of the air bending. Traditionally, the values of springback is obtained for air bending parameters from handbook tables or springback graphs. However, the handbook tables or springback graphs are obtained using experiments and it is a time consuming processes. In this paper, a finite element model has been used to analyze the air bending process. Some experiments are carried out on ST12 materials, and the finite element model is validated comparing with experiments. In the present research the influence of process variables such as punch radius, die radius and die on springback are discussed using finite element analysis. Thus, the presented results of this research provide a basis of design to improve forming quality.
Carrier Aggregation and its Application in 230MHz Power Industry Spectrum
Authors: He Qing Su , Huo Da Wei , He Jin Hong , Xiao Yan Jiang , Yu Bin
Published: September 2013

Carrier aggregation technology is a key technology of LTE-Advanced,which is proposed by 3GPP organization as a 4G technology. This paper describes its application within 230MHz power industry existing authorized spectrum, aggregate the discrete narrowband, combine with some other technologies, such as OFDM, to build an innovative 230MHz power radio broadband communication system to achieve broadband transmission of power data. The laboratory theoretical simulation and pilot project verify that this application effectively take advantage of the power existing spectrum, can fully meet the bandwidth needs of power data transmission, presents a thought to solve the status of existing discrete authorized spectrum and its restriction on power radio data transmission.
Designing and Implementation of RFID Reader Based on Nios II
Authors: Ren Wen Ping , Shao Chun Lin , Li Gen
Published: September 2013

For the Current, the design of RFID reader based on SCM has large size and not easy to upgrade. This paper conducts a research work on the new design scheme of RFID based on Nios II soft core. The advantage of the design mentioned in the paper is according to the requirements of increasing or decreasing peripheral components. In this design, the System hardware is described in detail and also introduced the control method of RC500.
A Simulation Research of Binary Anti-Collision Algorithms in RFID System
Authors: Liu Jin Hua , Jian Cha Sheng
Published: September 2013

An Anti - collision Algorithms technique would be required in RFID system to reduce conflicts and identify several tabs very quickly and accurately.Binary Search algorithm in a TDMA system is the most usual type of Anti - collision Algorithms in RFID System. This paper puts forward programming and simulating by using MATLAB based on EPCs Binary Search algorithm .Finally the results are compared and analyzed at the end of the paper and the author gives some pieces of advice.
Widening Frequency Band of Uniform SPL Distribution Using Adaptive Genetic Algorithm
Authors: Huang Zhao Xin , Ma Sai , Wang Hui
Published: September 2013

Uniform sound pressure level (SPL) distribution of linear phased loudspeaker array is limited by frequency. This paper widens the applicable frequency band of uniform SPL distribution in a linear listening area. By using an improved adaptive genetic algorithm (which contains a novel objective function, modified genetic operators and parameter setups) to control the directivity pattern details accurately, uniform distribution of SPL on a linear listening line in a wider frequency is achieved. The simulation and experimental results show that the SPLs on the test listening line are basically uniform from 200Hz to 500Hz, which demonstrates that the improvement of adaptive genetic algorithm is effective.
Matching Characteristic of Constant Voltage Source Excited Filter in Power System
Authors: Kang Wei , Zhang Li Xia , Wan Ji Bo
Published: September 2013

Filters between voltage source converter and the batteries in power system can be categorized into constant voltage source excited filters. The paper discusses the importance of the matched structure and parameters for power filters. The relation between matched structure and filters output characteristic is demonstrated and the design principle is introduced. The work above proved that even if the filters are designed for the same transfer function, so long as filters load resistance is different, their designed parameters are also different. Traditional power system filter seldom consider its both ends load matching characteristic. When the difference between filter's load characteristic and practical system equivalent impedance are large, the actual filtering effect becomes worse, current loss arises and even there may be the possibility of resonance. As the lack of energy resource and energy crisis is gradually becoming a serious problem, energy conservation is important. Constant voltage source excited circuit configuration model is established through the simulation and test. The results show the validity and feasibility of the method that filter should be designed the according to its load characteristic in practical application.
Synchronization of Chaotic Gyro Systems via Sliding Mode Control with Cooperative Weights Neural Network
Authors: Che Yan Qiu , Yang Ting Ting , Li Xiao Qin , Li Rui Xue
Published: September 2013

In this paper, a sliding mode control (SMC) with a cooperative weights neural network (CWNN) is proposed to realize the synchronization of two chaotic Gyro systems with nonlinear uncertainties and external disturbances. By the Lyapunov stability method, the overall closed-loop system is shown to be stable and chaos synchronizationis obtained. The simulation results demonstrate the effectiveness of the proposed control method.
A New TIGBT Device with Hole Bypass Emitter and Simulationuse
Authors: Xiong Yan , Shu Lai Yu
Published: September 2013

In this paper, a new TIGBT device with Hole Bypass Emitter was proposed. Compared with traditional TIGBT, the new structure introduce a P+ hole bypass region under trench metal emitter. Simulation results by SILVACO show that the new structure suppress latch-up effectively and allow wider Safe Operation Area (SOA) as well as higher security current without latch-up and have better temperature stability. In addition, all the impurity implantations in this structure need no extra mask, it is very convenient for fabrication.
Research on Continuous Emission Monitoring System in Thermal Power Plant
Authors: Shi Bing , Ma Zheng Hua , Jiang Jian Ming , Duan Suo Lin
Published: September 2013

The system aims to collect reliable emission data in real time, provide the operator with real-time emission parameters, and guide the optimization of unit operation and control of pollutants in flue gas emissions. One kind of continuous emission monitoring system is designed based on PROFIBUS-DP protocol in power plant, the architecture of system is presented and the principle is described in detail.
Estimation on State of Charge of Power Battery Based on the Grey Neural Network Model
Authors: Du Lu Lu , Li Bei , Zhang Huai De
Published: September 2013

The state of charge (SOC) of power battery is an important parameter of battery state, and it plays a vital role in real-time accurate estimation, condition monitoring, improving battery life, and ensuring the safety of power supply. This paper presents the grey neural network model of the relation between the battery SOC and rebound voltage, discharge current. Based on this model, a new on-line SOC detection method using rebound voltage and discharge current in the discharge process is proposed. From the testing results, the model and algorithm were proved to be feasible and effective, and the estimated error is controlled within a range of ±8%.
Reverse Modeling of Vehicle Suspension Control Arm
Authors: Zhang Hai Bo , Chang Ying , Zhang Rui Jun , Fan Hong Yuan
Published: September 2013

Reverse modeling of vehicle suspension control arm is studied. Firstly, the data of vehicle suspension control arm is acquired. Secondly, the scanning point cloud data is processed. Then 3D model of vehicle suspension control arm is reconstructed. Finally, models deviation is analyzed to find out the deficiencies and to improve the accuracy of the model. Reverse modeling based on CATIA can make up the shortage of traditional modeling method and solve the problem of gaining the data of complex curved surface parts. It also can shorten the innovation and improvement cycle of the vehicle suspension control arm and reduce the production cost and enhance enterprise competitiveness.
Non-Linearization Simulation Research of Linear Active Disturbance Rejection Controller
Authors: Zheng En Rang , Yang Hao , Wang Shi Chen
Published: September 2013

The characteristics of PID controller, Active Disturbance Rejection Controller (ADRC) and Linear Active Disturbance Rejection Controller (LADRC) are introduced in the paper, then the parts which can be improved are analyzed, which leads to the topic of balancing linear and nonlinear elements in controller. LADRC with FFTD is used as an example in simulation experiment operated in Matlab7.0.The results shows that the control effect of LADRC with FFTD is better than other three controllers above. The simulation results and perspectives in paper offers reference for combining linear and nonlinear controller and balancing difficulty and performance.
Low Cost Wear Leveling for High-Density SPI NAND Flash in Memory Constrained Embedded System
Authors: Liu Gen Xian , Wang Dong Sheng
Published: September 2013

SPI NOR Flash is widely used in embedded system for its compact package and simple interface. It is suitable to medium scale data storage. Now, industry provides higher density NAND Flash with the same interface and package as SPI NOR Flash. But the erase/program circles of NAND Flash is less than that of NOR Flash. The lifetime of NAND Flash is becoming the critical issue. Wear leveling algorithms prevent NAND Flash from prematurely retiring by mapping the logical block to different physical blocks. To our knowledge, most wear leveling algorithms need several kilobytes of RAM for keeping the mapping data structures, which is costly for the resource constrained micro controller. This study first proposes a no RAM required design with presetting lifetime, and then presents an adaptive design which requires only 2 kilobytes RAM with elasticity lifetime. The proposed design can be adapted in most of embedded systems based on low cost micro controller.
Grid-Based Cluster Head Selection Algorithm in Wireless Sensor Networks
Authors: Chen Cun Xiang , He Zun Wen , Kuang Jing Ming , Sun Hong Mei
Published: September 2013

Although low-energy adaptive clustering hierarchy (LEACH) protocol adopts distributed clustering algorithm and randomized rotation of Cluster Heads (CHs) mechanism to reduce energy consumption, election of CHs without residual energy and position information of each nodes brings about irregular distribution of CH, low network coverage and short lifecycle. In order to avoid these shortcomings, a Grid-based Cluster Head Selection (GCHS) is proposed. Referring to sensing distance, network is divided into several grids equivalent to independent clusters which can meet network coverage and connectivity. Furthermore, CH is selected ground on residual energy level of each node. Simulation taking full advantage of concept mentioned above manifests that it achieves a significant improvement in network coverage and lifecycle.
Optimization of LDPC Codes by Extrinsic Information Transfer Chart
Authors: Zhang Jing Xi
Published: September 2013

The optimization of degree profiles of low-density parity-check (LDPC) code in additive white Gaussian noise (AWGN) multiple access channel (MAC) by fitting the transfer characteristics of variable nodes detector (VND) and that of check nodes detector (CND) is discussed. Extrinsic information transfer (EXIT) characteristics are used for determining the degree profiles based on curve fitting. The convergence the optimized LDPC code is ensured by the EXIT characteristics of VND and CND. Degree profiles are obtained and check matrix is constructed. Simulation results show that the method is variable in designing LDPC code degree profiles in MAC with reduced complexity compared with density evolution based on Gaussian approximation.
Image Retrieval Using Mutual Information
Authors: Wang Ya Fen , Zhang Feng Zhen , Liu Shan Jian , Huang Meng
Published: September 2013

In this paper, we study an information theoretic approach to image similarity measurement for content-base image retrieval. In this novel scheme, similarities are measured by the amount of information the images contained about one another mutual information (MI). The given approach is based on the premise that two similar images should have high mutual information, or equivalently, the querying image should convey high information about those similar to it. The method first generates a set of statistically representative visual patterns and uses the distributions of these patterns as images content descriptors. To measure the similarity of two images, we develop a method to compute the mutual information between their content descriptors. Two images with larger descriptor mutual information are regarded as more similar. We present experimental results, which demonstrate that mutual information is a more effective image similarity measure than those have been used in the literature such as Kullback-Leibler divergence and L2 norms.
Mirror Transform to Conquer Deception for Particle Swarm Optimization
Authors: Xu He Ming , Wang Ying Lin , Xu Xin
Published: September 2013

Particle swarm optimization meets difficulties when handling deceptive problems, because the local optimal attractors misguide the particles and pull them away from the global optimum. Function transform that changes the shape to make it easier for the algorithm to optimize is an efficient way to change the original attraction, but the existing strategies cannot conquer deception. Therefore we propose the mirror transform by simply reversing the original attraction. Experimental results validate the efficiency of our strategy.
Research on the Satisficing Policy of the Secretary Problem
Authors: Wu Xin Lin , Zhao Yong
Published: September 2013

The methods for determining optimal policies are core problems in the standard secretary problem. The optimal policies are based on the hypothesis of complete rationality. However, some experimental researches showed that decision makers in reality often stopped searching earlier. In this paper, some assumptions of the standard secretary problem are weakened and a satisficing policy based on the hypothesis of bounded rationality is proposed to describe the choice behavior of a decision maker. Moreover, the possibility degree of the decision-maker to choose the satisfactory item is calculated.
Improved Particle Swarm Optimization Algorithm and its Application Based on the Aggregation Degree
Authors: Zhang Zhong Rong , Liu Jin Peng , Fei Ke De , Niu Zhao Shan
Published: September 2013

The aim is to improve the convergence of the algorithm, and increase the population diversity. Adaptively particles of groups fallen into local optimum is adjusted in order to realize global optimal. by judging groups spatial location of concentration and fitness variance. At the same time, the global factors are adjusted dynamically with the action of the current particle fitness. Four typical function optimization problems are drawn into simulation experiment. The results show that the improved particle swarm optimization algorithm is convergent, robust and accurate.
An Experimental Study on Improved Production Process of Large-Diameter Cylinder Assembly
Authors: Zeng Hui Fan
Published: September 2013

Post-welding annealing and aging treatment are commonly used to reduce welding residual stress and post-welding deformation. However, both show their limited effect in the application of large workpieces. Present study attempts to explore the residual stress state and post-welding deformation law of large workpieces by improving the production technology of the important workpieces of certain engineering equipment a large cylinder assembly. It is proposed that the deformation induced by post-welding residual stress can be effectively compensated by increasing the dimensional accuracy in cutting processing. In this way, aging process is replaced and qualified products can be obtained in a much shorter production cycle.
Study of Highway Crack Diagnosis Based on Cellular Neural Network
Authors: Yao Sheng Zhuo , Li Guo Dong , Zhang Fu Xin , Ge Lin
Published: September 2013

Road quality information detect system is an important component in architecture quality detect system, also is the basement of successfully working of other related project for the whole country. The study of detecting the road crack is the key to insure the security of accurately detect the road quality in transportation system. In this paper, we come up with a fixed way of road undersized rift image detection by using cellular neural networks. By image processing, building rift networks and details networks and adding the model of similarity undersized rift networks. It can avoid the problem that can not accurately detect undersized crack by only taking the crack feature value. The experiment proved that fixed crack detect computing is easy to do, more accurate to detect the undersized cracks on the road and can reach the standard level of current detect technique.
The Realization of Random Frequency Modulation Pulse Compression Signal Based on AD9858
Authors: Huang Shi Zhao , Liu Yong Feng , Wei Zhe
Published: September 2013

A scheme producing non-linearity frequency-modulated signal which can be updated on-line based on AD9858 is mentioned. A method to design NLFM signal using immediate data update is introduced. Circuit structure is designed. Major factor that impacting data is analyzed and its solution is presented. Experiments certify that this method can generate broadband and narrow pulse width non-linearity frequency-modulated signal, whose frequency spectrum can be updated on-line in real time.