bluuebunny/crossref_metadata_2025 huggingface dataset:
A Cutting Algorithm Based on the Tin Stratigraphic Model
Authors: Liu Jia , Li Wei Bo , Chen Yao Hua , Dong Lin
Published: November 2012

This paper researched the cutting algorithm on the basis of the stratigraphic Tin model. Different from the traditional grid cutting method which was a single plane cut, the paper designed a polygon prisms cutting method for simulating geological boundary and mining boundary by the interactive analysis of the stratum model. This method improved on partitioning the triangle nets and reconstructing the stratum, which was able to realize cutting stratigraphic with the arbitrary polygonal prisms. Finally, the test result showed the cut graphics by the method of polygon prisms cutting stratum model in OpenGL 3d graphics library.
Judgement Research on the Dump Truck Frame Intensity-Mass Relationship Based on Fuzzy Theory
Authors: Yang Chun Hui , Zhang Wen Ming , Yang Jue
Published: November 2012

During the frame optimization design, according to fuzzy integrated evaluation theory, fuzzy mathematical models of intensity coefficient and mass coefficient and intensity-mass ratio coefficient of dump truck frame were established. Based on those, in terms of Sugeno fuzzy discursion method, fuzzy discursion model about frame intensity-mass relationship rationality was established, too. Through checkout of three dump truck frames of 170t and 85t and 42t, validation results were the same as the fact. So, it was concluded that the fuzzy integrated evaluation model and the fuzzy discursion model gave helpful guidance on frame designing work.
Decision Tree Classification Algorithm within Concept Similarity
Authors: Ju Chun Hua , Mao Li Li
Published: November 2012

Data stream mining has been applied in many domains, but the concept drifts of data streams bring great obstacles to data mining. Current researches about classification algorithm for streaming data with concept drift have achieved many successes, while they pay little attention to the iterancy of data streams, namely, the situation of the historical concept reappears. For this characteristic, this paper puts forward that it utilizes the classifier model of the historical concepts or high similarity concepts through calculating the concept similarity to classify and predict. In this way, we don’t need training any more. Meanwhile, it reduces the cost of update model, speeds up the classification of the rate and improves the prediction efficiency.
Development of High-Speed Memory Interface Application Based on FPGA
Authors: Zhou Xiao Bo , Li Rui Jing , Zhao Qiang
Published: November 2012

In order to make a convenient interface to the complexity of the timing of high-speed, high-capacity storage medium applications, a new design has been proposed for the interface device of storage media with FIFO feature based on DDRII SDRAM by this thesis. At first, the principles and implementation of DDRII SDRAM controller are introduced. Then the memory interface module has been designed based on the time-sharing technique of DDRII SDRAM. Finally, the principles of the interface controller module have been deeply analyzed and implemented by functional simulation through the Quartus II software and FPGA hardware verification. Through stimulation and verification, the high-speed memory interface controller module based on DDRII SDRAM implemented the bi-directional data transfer and interaction between DDRII memory and FPGA, which has a certain value of practical application.
The Weighted Localization Algorithm Based on RSSI Calibration
Authors: He Ning Hui , Li Hong Sheng , Bian Guang Rong
Published: November 2012

This paper introduces the first wireless sensor network node localization in two ways, one is based on the RSSI ranging approach, and the other is based on the weighted centric location algorithm, as a result of environmental factors, the same RSSI value the distance ，but the corresponding values are not always the same, these two methods do not consider the environmental impact to the RSSI value. Therefore, we consider combining the distance and signal strength information as a reference to correct each beacon node weights， in order to improve positioning accuracy.
A Gain-Schedule Adaptive LQG Control for Networked Systems with Time Delay and Packet Dropout
Authors: Wu Li Zhen , Hao Xiao Hong
Published: November 2012

This paper studies the coordinate optimization control problem of networked control systems (NCSs) with random time delay and packet dropout. A discrete-time system model of NCSs with time-delays and data packet dropout is proposed. A method of state estimation base on extra kalman filter is given. Then a gain-schedule adaptive LQG control strategy base on effective delay-estimation online is proposed. The result illustrate that the effectiveness of the proposed controller design and the satisfactory performance of the system.
Microstructures and Properties of Y2O3/La2O3/Cu Composite by Internal Oxidation
Authors: Wang Song , Xie Ming
Published: November 2012

The 1.5%Y2O3/1.5%La2O3/Cu composite was prepared by oxygen and nitrogen atomization spray deposition technique and internal oxidation. The microstructures, hardness, strength, electrical conductivity and arc erosion surface of the composite were investigated by optical light microscope, scanning electron microscope, micro-hardness tester, tensile test and arc erosion experiment. The results show that, with the increasing of internal oxidation temperature, the grains of the composite grow up obviously. When the internal oxidation reaches to 1000°C, the matrix grains begin to appear annealing twins. The micro-hardness was 436HV, the ultimate tensile strength was 580MPa, yield tensile strength was 503MPa, elongation of alloy was 8.7% and the electrical conductivity was 87% IACS of the composite by internal oxidation at 1000°C for 2h.The arc erosion surface shows a large number of paste-like coagulum and bubbles. Introduction
Enhanced Provably Secure NTRU Encryption Based on Hard Learning over Rings
Authors: Fang Wu Yan , Huang Zheng , Cheng Wang Li , Yan Wen Qiao
Published: November 2012

Since the presentation of NTRU public-key cryptosystem by Hoffstein, Pipher and Silverman, its favorable properties, such as easily created keys, high speed, excellent performance and conjectured resistance to quantum computers, have made it to be of great use. This paper proposes an enhanced scheme based on the hard learning with error over ring (R-LWE) problem to improve the security of the modified NTRUEncrypt presented by Stehle and Steinfled. We used part of the padding ideas of Fujisaki and Okamoto to obtain this scheme. It is semantically secure in strong sense of indistinguishability against adaptive chosen-ciphertext attacks in the random oracle model assuming the quantum hardness of standard worst-case problem over ideal lattices. It is also possible to arbitrarily decrease the error probability, and even to eliminate it completely. We gave the detailed analysis using the known results from classic works. Furthermore, this scheme owns many advantages such as the uniformity of public key, usual assumptions and the freedom for coding messages.
Improved Embedded Micro-PSO for High-Dimensional Optimization Problems
Authors: Han Wen Hua , Zhu Chang Dong
Published: November 2012

This paper presents a novel optimization technique called embedded micro-particle swarm optimization (EMPSO) to solve high-dimensional problems with continuous variables. The proposed EMPSO adopts a population memory which is divided into two portions as the source of diversity, and an external memory to collect particles performing well in an embedded PSO with a very small population size. However, the fact that the new method doesn’t excel in all of the benchmark functions highlights the necessity of developing improvement. Thus an adaptive mutation operator is introduced into EMPSO to remedy the issue. The experimental results show that the improved EMPSO has good performance for solving large-scale optimization problems.
The Relationship between Temperature and Levitation Stiffness of YBCO Bulk for Maglev Vehicle
Authors: Jing Hua , Jiang Ming , Wang Su Yu
Published: November 2012

In order to make the levitation performance of the high temperature superconducting (HTS) magnetic levitation (Maglev) vehicle more stable and safer, in this paper, using a cryogenic measurement system, we measured the levitation forces of YBCO bulk above halbach-type permanent magnet guideway (Halbach PMG) in the temperature range from 77 K to 60 K, then in the condition of deep cryogenic, the levitation forces of YBCO bulk at different field cooling heights (FCHs) were also measured, according to which the levitation stiffness were calculated. The results show that the levitation stiffness of HTS/PMG Maglev system is better at lower temperature. Moreover, when the temperature of YBCO bulk decreases from 77 K to 73 K, the levitation stiffness largely increases in any FCHs. However, after the temperature of the bulk decreases to 73 K, the rate of the levitation stiffness increased gradually reduces. The results are helpful to HTS Maglev vehicle application.
Research on Automatic Judgement of Wheelset Press-Fit Curve
Authors: Xiao Jun , Han Jian Bin , Cheng Xin , Fang Rong
Published: November 2012

This paper presents an automatic judgement method for wheelset press-fit curve, in which thirteen technical conditions are examined for qualified wheelset assembly or not. In order to meet the requirements of Criterion of inspection and repair - railway vehicles [2007]95, some algorithms are designed to identify several traits on press-fit curve, such as force zoom, force decrease, flat line, concave-up shape and so on. In accordance with the Criterion 95 and the algorithms, a quality judgement software attaching to the computer control system in a wheelset assembly machine is developed. The practical application shows that the software’s judgement accuracy is up to 99.4%. Compared with artificial approach, the accuracy, reliability and efficiency of the new judgement method all improve greatly. It also avoids influences of personal factors and makes great sense to the assurance of press-fit quality and transportation security.
Design of Power Control System on Medium Frequency Induction Furnace Using Microcontroller
Authors: Zhu X.X. , Hu J.F. , Xiong C.R.
Published: November 2012

The medium frequency induction furnace power control system of industrial grade includes the microcontroller STC89C52RC, power converters, data amplifiers, analog to digital converter, stepper motor and excitation regulator, etc. The medium frequency generator’s output voltage and current signals are passed to the power converter to transform the millivolt DC signal into a linear relationship. The outputs from the power amplifier controlled by the data conversion single-chip are input through the ADC. The signals are compared with the power base value set by the user to calculate the control commands, to control the stepper motor action and control the stepper motor to forward or reverse, as well as to adjust the excitation current. Therefore, the medium frequency generator output power is stable. The heating temperature of the work pieces are precise controlled. A detailed description of the system's hardware and software composition and design methods are illustrated in this paper.
Low-Alkali Cement Composition Using the Green Tea and Industrial-by Products
Authors: Yoon Seung Joe , Jung Jae Ho , Kim Young Min
Published: November 2012

This research aims at examining how to decrease the absolute amount of cement so as to reduce CO2 generated in theprocess of cement production. Accordingly, this research examines the production of mortar by using a non-cement-type ofinorganic powders through industrial by-products such as blast-furnace slag and fly ash, investigates the pH-reducing effect ofcement products by using green tea, and checks the possibility to reduce pH.Inorganic powders were used for mixture of mortar, and experiments were conducted to measure the mortar’s compressivestrength, reduced amount of CO2, and pH concentration. From the test, first, it was found that the compressive strength was similar to the level of OPC when asmall amount of cement was added to inorganic powders, so in terms of compressive strength, the mortar with inorganicpowders was considered to be a good substitute for cement. Second, with regard to the reduction of CO2, CO2 emission was 20to 35 percent of that of cement when inorganic powders were used, which showed they would help greatly alleviate theenvironmental burden on the cement industry. Third, the older the material age was, the lower the pH concentration became,and the pH concentration got lower when GT was added to each type. In addition, mortar with inorganic powders is expected to be an environmentally friendlysubstitute for cement in that its compressive strength was similar to OPC’s and it can reduce emission of CO2.
Finite Element Modeling Method of 3D Braided Composites Based on ICT Technique
Authors: Wang Shu Yong , Fu Jian , Wang Qian Li
Published: November 2012

A finite element modeling method based on industrial computed tomography (ICT) technique is proposed to address the insufficient accuracy of traditional grinding method for the meso-structure analysis of composite materials. In this method, the slice images of 3D composites are first acquired by ICT technique. And then, the internal meso-structure images of composite materials are obtained through the digital image processing to the slice images. Finally the meso-structure images are converted to vector format and inputted ANSYS to build the finite element model for the analysis of the mechanical properties. The experimental results show that this method can establish the finite element model and reveal the internal structure and the inherent mechanical properties of composite materials. These researches provide a reference for the manufacture processing of 3D braided composites, and the theoretical basis for the optimal design and performance evaluation. It would be of significance for the improvement of the composites mechanical properties.
Estimate of Flying Projectile Attitude Based on MEMS Gyroscope Measurements
Authors: Niu Chun Feng , Liu Shi Ping , Wang Zhong Yuan
Published: November 2012

To estimate the flight attitude angles of Guided Projectile rapidly and accurately to realize the precise control, angular motion equations and MEMS gyroscope measurements were used to build the state equation and the measurement equationcombined withthe ballistic priori knowledge. Based on the unscented kalman filter for nonlinear system, an approach of estimating the attitude angles of Guided Projectile was proposed. Taking a certain type of Guided Projectile as an example, the data of triaxial angular velocities with the measurement noise was considered as the output signal of MEMS gyros, and considered the calculated ballistic data as the ballistic priori knowledge. Through the approach proposed in this paper, the above were used to obtain the estimates for attitude angles. The results indicate that, it’s feasible to obtain the attitude angles by angular motion equations and gyros. On account of the actual random noise signal of gyros, the accuracy of the estimated attitude angles can meet the requirement of trajectory control system for Guided Projectile.
The Research of Permanent Magnetic Field Treatment on the Iron & Steel Industry Circulating Water Impacts of Stability Index
Authors: Li Dong Kui , Jiang Li Li , Zuo Hai Bin , Tan Zan Lin
Published: November 2012

Iron & steel industrial circulating water system there is a scaling and corrosion problems, the system fouling or corrosion may be judged by monitoring the water quality Stability index. In this paper, we use the magnetic treatment equipment developed by us in the laboratory to simulate the physical treatment process of magnetic field on the industrial circulating water system, and the experimental data is analysis by two-way ANOVA. We have found that: when the circulating water is tap water: (1) if water velocity is 0.6m/s, the magnetic field intensity, magnetic treatment time has a significant influence on the PSI, PSI decline with the magnetic field processing time to increase , and the PSI as well as the time have a good linear relationship; (2) if water velocity is 1.2m/s, the magnetic field strength has a significant influence on the PSI; (3) if water velocity is 2.3m/s, the magnetic field intensity and time has a significant effect for the PSI; when the magnetic field strength is 3.4T, and reaction time is 5 h, PSI is close to 6, water quality is stable; (4) speed and the magnetic field there is an interaction for PSI, that the magnetic field strength and speed of circulating water changes in the PSI also. When the circulating water is CaCl2 and Na2CO3 aqueous solution configuration: as water velocity is 1.2m/s and well as 2.3m/s, the magnetic field strength and time has a significant effect on the PSI .The results show that: iron & steel industrial circulating water system be deal with by proper the magnetic field treatment can control the PSI. The appropriate range PSI of the circulating water can reduce the fouling and corrosion damage, it is significant to develop circulating water system quality control model.
Analysis to the Influence of Rendering Intents on Image Reproduction
Authors: Chen Lin Lin , Chen Guang Xue , Chen Qi Feng , Xu Rui Xin
Published: November 2012

Rendering intent is one of the key elements of color management, which has a great influence on image reproduction. Matching principles of four kinds of rendering intents in ICC are elaborated. Based on the color management workflow of ICC, the chromaticity of the color patches are measured with the spectrophotometer. And then the color difference and color gamut volume of the color patches are calculated and analyzed. The experimental results play an instructive role in the choice of rendering intents and the implementation of the color management.
A Zebra-Crossing Detection Algorithm for Intelligent Vehicles
Authors: Li Hua , Feng Ming Yue , Wang Xiao
Published: November 2012

This paper describes a robust algorithm for detecting zebra crossings to provide information for intelligent vehicles’ autonomous navigation in urban environment. First, transform images framed by the camera to the top view by an Inverse Perspective Mapping (IPM); extract the region of interest (ROI) from IPM image by local threshold segmentation. Then, extract datum band from RIO by analysis of every region’s length, direction, as well as mutual relations between the bands; finally, extract all bands belonging to the zebra crossing. The zebra crossing’s distance and direction are easily calculated in the IPM image. Experiments from 6000 street scenes with and without crossings demonstrate the robustness of the proposed algorithm.
A Method to Predict Disc Cutter Specific Energy for TBM Based on CSM Model
Authors: Li Gang , Zhu Li Da , Yang Jian Yu , Wang Wan Shan
Published: November 2012

By using fracture mechanics theory of rock, the rock fragmentation mechanism of tunnel boring machine (TBM) cutters is analyzed and the analysis of forces of cutter is carried out. A new method to predict disc cutter specific energy for TBM is developed in this study. By using the dynamic models of TBM cutters interaction with the rock, specific energy prediction model for TBM cutter head is developed. The data from the actual tunnel construction is analyzed by using an example of Qinling tunnel and the comparison is made with the field data. The results indicate that the model developed in this study could not only replace the experiment to disc cutter specific energy for TBM, but also provide a theoretical basis for the performance prediction and optimal design of cutter head for TBM.
Contact Analysis of HSK Toolholder-Spindle Interface
Authors: Liu Xue Mei , Luo Jian Wei , Li Ai Ping
Published: November 2012

This study was undertaken to analytically investigate factors which influence the performance of the HSK toolholder-spindle connection. The change of contact area and the contact stress distribution of HSK-A63 toolholder-spindle interface were analyzed with the finite element software ANSYS. The analysis results showed that the contact area and contact stress are significantly affected by clamping force and spindle speed, and that enough magnitude of interference can offset the gap between spindle and toolholder under high rotational speed and also affect the clamping force assigned to the flange face.
Resistance to Impact Load Analysis of a Novel Magnetorheological Damper
Authors: Huang Lin , Huang Xue Gong
Published: November 2012

In this paper a new MR damper presents, every stage coil connection is independent. The fluid channel congestion and single axial magnetic field problems, existing on the old MR damper worked under the high impact load were solved. With this connection type, MR damper can generate an axial time–varying magnetic field with different input current every stage. The MR damper’s electromagnetic model was built, and the simulation analysis of new and old MR damper under impact load based on the PID control algorithm was finished. According to the simulation results, compared the anti-impact-load performance between new and old damper. The results show that working on the same impact load, the newly designed MR damper can reduce the displacement and the energy consumption simultaneously compared to the prior damper.
The Lightweight Design of CNC Lathe Spindle Box Based on Topology Optimization
Authors: Zhang Guo Tai , Yin Zhi Hong
Published: November 2012

In this paper,the mechanical properties of a certain type of CNC lathe spindle box are analyzed by the finite element software HyperWorks. On this basis, the topology optimization of the CNC lathe spindle box is done by the variable density method. where the spindle box relative density is taken as the design variable and the minimum volume of the spindle box as the objective function, its static deformation and the low modes as constraints．That is to find the optimal layout of the structure,and then the size optimization of the spindle box is done to make further amendments of the topology optimization results. This design method achieves the lightweight design of the spindle box, reduces manufacturing costs,and provides a theoretical basis for enterprises to improve the structure of CNC lathe spindle box.
3D Reconstruction of Weld Pool Surface by a Biprism Stereo System
Authors: Zhang Ya Dong , Liang Zhi Min , Wang Dian Long , Wang Jun
Published: November 2012

3D shape of the weld pool surface can be used to infer the penetration state of the weld pool, which has an importance influence on weld quality. In this paper, a novel stereo camera system that used only one camera and a biprism placed in front of the lens was applied to capture virtual image pair of the weld pool surface. The most advantage of the system setup is that corresponding points lie on the same scan line automatically, i.e. the stereo image pair is self rectified. The calibration of the system was done using plane pattern by Zhang’s algorithm and the standard SSD stereo matching algorithm was applied to find the corresponding points in the left and right image. The reconstructed 3D shape of the weld pool surface during base current period of P-GMAW by the system has shown that the technique has potential application for control of weld process
Fault Diagnosis Mechanism Based on FTA and Bayesian for Large-Scale CNC Equipments
Authors: Liu Jin Fei , Chen Ming , Li Ying Lei
Published: November 2012

In view of the disadvantage of current FAT-based fault diagnosis method in large-scale complicated system, fault diagnosis method of heavy NC machine based on FTA and Bayesian is discussed. Firstly, building fault trees with the help of reachability matrix, and to set the determinate conditions at every node of fault tree combining FTA with rule reasoning, the minimum cut set of fault reasons are determined as a result of step by step screening fault tree from top-down; Secondly, Bayesian method is integrated into the fault tree diagnostic method to calculate the posterior probability triggered by each fault tree in order to locate the fault tree where the fault had occurred and ensure high efficiency of fault diagnosis; Finally, B/S based intelligent fault diagnosis system for large-scale CNC equipments is developed, and the feasibility and efficiency of this method are proved in an example of fault diagnosis of Φ 160 NC boring and milling machine.
Intelligent Temperature Controlling System Based on Single Chip Microcomputer
Authors: Xie Fei , Zhong Fei , Ding Shan Ting , Wang Xuan Ze
Published: November 2012

Based on the principle of integral circuit and thermal element, the present study considers the application of 80C51 single-chip micro-computer into the design of intelligent temperature control system. In this paper, the main approach is to make the ambient temperature change in accordance with the pulse width variation. The process is realized through the integral circuit consisting of the thermal resistor, capacitor and operational amplifier. In this way, with the pulse width measurement, we can detect the ambient temperature as well as control the external circuit. The experiment indicated that the system simplifies the temperature measurement with high reliability, great convenience and wide applications.
Influence of Surface Pretreatment on Carbon Coating of Cutting Tools Using PVD
Authors: Shri D.N. Awang , Ramli J. , Alang N.A. , Mahat M.M.
Published: November 2012

Alumina (Al2O3) cutting tools have been coated with carbon coating using physical vapor deposition (PVD) to improve its wear resistance. The cutting tools were subjected to surface pretreatments namely blasting and acid etching to improve the coating adhesion onto the substrates. The effects of pretreatments on the cutting tools topography prior to deposition were investigated using atomic force microscopy (AFM) while the surface morphology was investigated using scanning electron microscopy (SEM). The rake angle of the coated cutting tool and surface roughness of the cutting edge were investigated using infinite focus microscope. The adhesion strength of the carbon coating was investigated using microscratch. This study shows that although the coating were deposited evenly on all samples, the cutting tool that was blasted prior to deposition has better adhesion strength when compared to acid etching and no-pretreatment.
Design of the Human-Machine Interactive System of Double Twister Based on WinCE
Authors: Yuan Song , Zhang Jian Yi , Yuan Yan Hong
Published: November 2012

By analyzing the control principle of distributed control systemon thedouble twister, this paper designed the human-machineinteractive system of double twister based on WinCE. After researching embedded WinCEOS and remote control based on Web servers, and designing the application programs for human-machineinteraction onembedded hardware&software platform, the intelligent control and remote control of double twister were realized. The experimental results show that the system can meet the requirement of double twister intelligent controlling, and is representative of a new height of double twister intelligent controlling.
Bioinformatics Analysis and Characteristics of UL19 Protein of Duck Plague Virus
Authors: Dai Bi Hong , Cheng An Chun , Wang Ming Shu
Published: November 2012

he DPV UL19 protein encoded by UL19 gene was identified in our laboratory. In this article, we report some information about the structures and functions of this protein by using bioinformatics software or website online. The prediction indicated that DPV UL19 protein had no signal peptide and no transmembrane region, and could be a protein outside the membrane. It might contain many potential epitopes and functional sites. According to the prediction of 3D structure, a high reliability model was found in this protein. These works would be useful for further structural and functional studies of the DPV UL19 protein but experiments are needed to check the predicted results.
The Theory and Methods of Mineral Resources Quantitative Forecast and Evaluation
Authors: Xin Jiang , Xu Gui Hong
Published: November 2012

The author carefully analyzed the theoretical basis and means with reading articles and books about the quantitative forecast for mineral resources evaluation.And completely summarizes the new theoretical frontiers, such as metallogenic series, metallogenic system, the origin of the model and so on, as well as about the methodology, gis, geochemical blocks and so on.
A Novel Harmonic Control Circuit Based on Composite Right/Left Handed Transmission Lines
Authors: Gao Juan Juan , Lu Gui Zhen
Published: November 2012

A novel harmonic control circuit based on the composite right/left-handed transmission lines (CRLH TLs) is presented to suppress the harmonic components of the dielectric resonator oscillator (DRO). Firstly, the principles of left-handed transmission lines (LH TLs) are introduced. Then, the design of the proposed harmonic circuit is presented and the simulated results are shown. The second- and third- harmonic components are suppressed, and the output-power at fundamental frequency has increased.
Numerical Simulation of Inner Support for Excavation Based on FEM Software ABAQUS
Authors: Sun Yue , Chen Yue Nan , Wang Zhi Yun
Published: November 2012

In two-dimensional space, an elasto-plastic finite element computational model was established to simulate inner support for excavation on the basis of the general-purpose finite element software ABAQUS. The soil was assumed to be a uniform and normally consolidated clay layer and strut was discreted by spring element. Compared with published case study, it can be concluded that FEM software AQAQUS can present one reliable simulation progress of inner support for excavation.
The Study of Retroreflective Material Based on Mesopic Vision Theory
Authors: Zhu Chuan Zheng , Yang Yong , Wang Lei
Published: November 2012

The coefficient of retroreflection is considered as the most important parameter of retroreflective material, the value of which is tested by photopic detector now. In fact this material were usually used under mesopic vision condition, and through the test of retroreflective spectra, the mesopic spectral luminous efficiency Vmes(λ) and equivalent brightness were calculated. The result show that at different brightness the retroreflective light present unlike spectrum distribution, and white, blue material with higher retroreflection value under mesopic vision, red material own lower value, this phenomenon is more apparent with the decrease of brightness.
Independent Technology of CBTC System and Management Innovation in Urban Rail Transit
Authors: Ding Shu Kui
Published: November 2012

This paper introduces two technical innovations in the signal demonstration project of Beijing Subway Yizhuang Line: the “free wave antenna + waveguide” combined transmission and the "minimum system" simulation. It also summaries the demonstration project management concepts and innovative practice experiences. Analyzing the technology and management innovation, we expect to provide a reference for the progress of the autonomy of the other rail transport high-end and core technology.
Simple and Rapid Synthesis of LiFePO4/C Composite for Lithium Rechargeable Batteries by Microwave-Solvothermal Method Assisted with Short Time Post-Treatment Process
Authors: Su Chang , Liu Jun Lei , Xu Li Huan , Wang Ling Min , Huang Qi Fei , Zhang Cheng
Published: November 2012

A simple and rapid technique to synthesize LiFePO4 by microwave-solvothermal method assisted a short time post-treatment was described. The crystal structure and the charge-discharge performance of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge-discharge testing. The results indicated that this rapid synthesis technique by microwave-solvothermal method combined short time post-treatment was an effective way to obtain LiFePO4 with a single olivine-type crystal structure and small particle size. The electrochemical research indicated that the resulting LiFePO4/C composite could deliver 141.7mAh•g-1 at 0.1C at 25 °C and showed good stability retaining 97% after 45 cycles.
Study on Wind Speed Prediction Based on Rbf Neural Network
Authors: Wang Feng , Tan Zhi Zhong , Liu De You , Qian Xiang Dong
Published: November 2012

This paper analyzes the importance of the wind farm wind speed prediction, as well as the different forecasting methods in various fields. And established the RBF neural network forecasting model can forecast one hour ahead of the wind farm wind speed, and the results meet the actual forecast requirements. By reconstructing the wind speed time series, wind speed can be predicted one day in advance, the prediction accuracy and one hour ahead of forecast accuracy is similar. The method can predict a longer period of time the wind speed, and provide important reference for the wind farm power generation scheduling.
Comparing Level Set Method and Canny Algorithm for Edge Detection to Tongue Diagnosis in Traditional Chinese Medicine
Authors: Chen Yen Sheng , Chen Chung Hua , Chang Yuh Ming , Chang Chun Chih
Published: November 2012

The tongue diagnosis is an important diagnostic method in Traditional Chinese Medicine (TCM). Human tongue is one of the im¬portant organs which contain the information of health status. In order to achieve an automatic tongue diagnostic system, an effective segmentation me¬thod for detecting the edge of tongue is very important. We mainly compare the Level Set Method and Canny algorithm for edge segmentation. The segmentation using Canny algorithm may produce many false edges after cutting; thus, it is not suitable for use. But, Level Set Method can produce better edge contour. Therefore, it may be useful in clinical automated tongue diagnosis system. Experiments show the results of these techniques.
A New Slope SOI-LDMOS High-Voltage Power Device
Authors: Yang Xiao Ming , Cai Yu , Li Tian Qian
Published: November 2012

A slope SOI-LDMOS power device is proposed for high-voltage. When a positive bais is applied to the drain electrode, holes are induced and astricted by the slope buried oxide layer. So a high density positive charge layer is formed on the buried oxide layer. The electrical field in the buried oxide is improved as well as vertical breakdown voltage by the layer. Because the thickness of the drift region linearly increases from the source to the drain, the surface electric field is optimized, resulting in increase of lateral breakdown voltage. In this paper, the electric characteristics of the new device are simulated by Medici softerware. The result is shown that above 600 V breakdown voltage is obtained at 1μm thick buried oxide layer. The breakdown voltage is higher by three times than that of conventional SOI LDMOS.
Research on Interfacial Assembly and Coordination of Two Bolaform Schiff Base Compounds with Aromatic Spacer
Authors: Jiao Ti Feng , Zhou Jing Xin
Published: November 2012

wo bolaform Schiff bases derivatives with aromatic spacer have been designed and their interfacial phase behaviors and coordination with Cu(II) ions were investigated. It has been found that on the subphase containing Cu(II) ions, both Schiff bases can coordinate with Cu(II) in situ in the spreading films. The in situ Cu(II)-coordinated films could be transferred onto solid substrates and subsequently characterized by various spectroscopic methods such as UV-vis and Fourier transform infrared spectra as well as the morphological characterization with atomic force microscopy measurement. Depending on the different headgroups, both amphiphiles showed different aggregation behaviors in the Langmuir-Blodgett films.
The Design and Implementation of LCD Electronic Clock Based on Renesas MCU
Authors: Zhu Miao Miao , Niu Guo Feng
Published: November 2012

An electronic clock display system was designed by the paper with LCD display based on Renesas 78K0R serial MCU. The system completely took the energy-saving MCU production and LCD Panel as the core and was accomplished with C depending on specified integration platform. It can be applied in people’s daily life and manufacture, and will have the good application and promotion prospects.
Embedded Monitoring System of Progressing Cavity Pump Operating Conditions
Authors: Xu Jun , Gong Ren , He Xin , Li Xin Lei
Published: November 2012

The monitoring system for progressing cavity pump operating conditions based on dual-microcomputer is developed to fit the electronic parameters measurement characteristic and requirement of progressing cavity pump. By measuring the electronic parameters of progressing cavity pump driving motor and combining the internal losses of electrical motor, the torque and speed of progressing cavity pump polished rod are calculated accurately, to make correct decision for the oil wells working condition. Using the modular design method, the acquisition, storage, human-computer interaction and other necessary hardware is presented. The program flow charts of host-slave is designed respectively, Parameters calibration and communication module are mainly elaborated, in the meanwhile, computer’s data processing and fault diagnosis software are designed. The designed system has been successfully applied in oilfield, realizing the monitoring of screw pump’s working condition,ensuring the efficient operation of oil production system.
A PSO-Based UWB Pulse Waveform Design Method
Authors: Jia Zhan Biao , Li Bin , Xia Bin
Published: November 2012

The pulse waveform design method for ultra wideband (UWB) communication based on particle swarm optimization (PSO) technique is discussed, and the performance of UWB system with designed pulse is analyzed. According to analysis, the design of pulse is transformed into a process of finding the minimal solution of a function about weighting coefficient. The weighting coefficients are made certain based on PSO algorithm. The properties such as bit error rate (BER) performance in both single link and multi-user, link budget of the UWB system employing the designed pulse are simulated. Compared with Scholtz’s monocycle and random combined pulse, the results showed that the pulse designed based on the PSO algorithm has better BER performance and communication performance.
A Dynamic Threshold Optimization Algorithm for Spectrum Sensing with Energy Detection in Cognitive Radio
Authors: Wang Wei Ran , Wang Shu Bin , Zhao Xin Yan
Published: November 2012

In order to improve an efficiency of energy detection for a spectrum sensing in cognitive radio (CR), this paper proposes a dynamic threshold optimization algorithm. The traditional energy detection algorithm uses a fixed threshold, and can't guarantee always the optimal sensing performance in any environment. The improvement for sensing performance need to minimize the undetected probability and the probability of false alarm, and it is dissimilar for different CR users to accept these two errors. We improve the traditional energy detection algorithm, and firstly introduce a preference factor to characterize CR users’ different requirements for these two errors, then, propose a dynamic threshold optimization algorithm by minimizing integrated detection error for different signal-to-noise ratio (SNR). The simulation results show that the proposed algorithm effectively reduces the integrated spectrum sensing error, and increases the probability of detection, especially in low SNR.
Traffic-Aware Adaptive Discontinuous Receiving Scheme for Power Saving in Cellular Networks
Authors: Xiao Lin , Zhang Tian Kui
Published: November 2012

In the cellular networks, a new adaptive Discontinuous Receiving (DRX) scheme is proposed to improve the power saving. In the traditional DRX, the channel monitoring period is fixed, it will waste some energy to monitor channel when there is no data in a long period of time. In this paper, the support vector machine (SVM) is used for traffic prediction, which can predict the data packets arrival time. Then based on this prediction, the monitoring cycle of the DRX is adaptive with the traffic flow. According to prediction result, the sleep period of the receiver will be extended to avoid unnecessary waking up during the idle time. This traffic-aware DRX scheme can reduce consumed power for channel monitoring. The reduction of monitoring channel depends on the prediction accuracy, which has been verified by the simulation results. The simulation results also show that the proposed scheme is effective for power saving.
Toughness Properties of Concrete Modified with Water-Borne Polyurethane
Authors: Ding Bei , Zhang Xia , Zhou Dong Ling , Miao Chan Wen
Published: November 2012

A novel kind of block polymer with characteristics of rod-like chain conformations, water-borne polyurethane (PUA), was synthesized by incorporate polyacrylate (PA) into the PU chain to prepare an aqueous polyurethane-polyacrylate (PUA) hybrid emulsion with core-shell structure. The influence of water-borne PUA on workability and mechanical performance of concrete were investigated experimentally. PUA had minimal harmful effect on the compressive strength whereas the flexural strength was increased by 23.2% with dosage of 0.5% and 23.3% with dosage of 1.0%, respectively. The fracture energy ratios of concrete with a dosage of PUA less than 1% are greatly improved more than double with the decreasing of concrete strength less than 10%. The water-borne PUA also enhances the early plastic cracking resistance and the impact resistance of concrete. The impact energy consumption of samples with PUA increase nearly three times more than reference samples, also better than samples with PP fiber. And PUA can refine the crack from 2-4mm to 0.2-0.5mm of the main distribution, decreasing total area of crack greatly.
Effect of Silica Fume on Mechanical Properties and Carbonation Resistance of Concrete
Authors: Wang Qing Long , Bao Jun Chao
Published: November 2012

A designed experimental study has been conducted to investigate the effect of silica fume on mechanical properties and carbonation resistance of concrete, a large number of experiments have been carried out in this study. The results indicate that the addition of silica fume has improved the compression strength and elastic modulus of concrete. A considerable increase for the compression strength and elastic modulus of the concrete was observed by increasing the dosage of silica fume. Besides, the addition of silica fume can improve the carbonation resistance of the concrete composite evidently, and the carbonation resistance is becoming better and better as the silica fume content is increasing gradually.
The Dynamic Response Analysis on Train Liquid Storage Tanks under Harmonic Excitation
Authors: Zhang Qing Hua
Published: November 2012

This paper take the typical train liquid storage tank as research object, the fluid-solid coupling dynamic responses of the tank are analyzed under the track irregularities using finite element software ANSYS. The research indicates that the difference of the liquid volume in tank has great influence to the structural stress and strain. When the tank is not filled with liquid, the liquid has large-scale amplitude sloshing, and the stress and strain are much bigger than the static condition. But if the tank is full of the liquid, the stress and total amount of deformity of the tank can be obviously reduced.
Thermal Stress Analysis of Large Scale U-Shaped Aqueduct
Authors: Zhang Jian Hua
Published: November 2012

The aqueduct is one of large scale water conservancy project across river, which is the first level of anti-cracking structure with rigorous control of cracks. At present, the thermal analysis of aqueduct structure most borrows ideas from box-girder bridge structure without considering their difference. As the thermal stress of large-scale concrete structure during construction and operational process is redoubtable, the U-shaped model of a practical aqueduct of South-to-North Water Diversion is established to do the steady and transient thermal analyses. The result shows that the structure of U-shaped aqueduct is reasonable, it is not necessary to take special measures to control the temperature during the construction and operational process.
Research on Temperature Control and Cracking Prevention on Pier by Installing Expansion Reinforcing Bands during Construction
Authors: Li Hong Mei , Li Shu Shan , Xie Wei
Published: November 2012

The mechanism of crack formation on the concrete structure of gate piers during the construction period is analyzed. The temperature control and cracking prevention technique which combines surface heat preservation and the installation of expansion reinforcing bands is proposed. Based on the calculation principle of temperature fields and stress fields of concrete structures, simulated calculation analysis is conducted on the gate pier structure during the construction process by using the finite element method. The results show that the crack prevention effect of this temperature control measure is positive, and this measure has a certain reference value to similar engineering designs and constructions.
Study on the Impact of Long-Term Immersion on the Shear Strength of Compacted Lime Stabilized Expansive Soils
Authors: Dong Yun , He Wei Zhong , Wang Bao Tian
Published: November 2012

To offer or predict the shear strength of compacted lime stabilized expansive soils after long-term immersion for the slope analysis, the paper carried out direct shear test on the compacted stabilized expansive soils after different immersion time. The test results show that long-term immersion has significant impact on the shear strength of the lime stabilized expansive soils, the shear strength reduced sharply after soaking, but the shear strength tends to a stable value about 60%~70% normal strength while soaking is longer than 50 days. Logarithm model can well fitted the sketch of φ, c and immersion times within 50 days, which may be used to predict the shear strength of the stabilized expansive soils quickly.
The Finite-Element Analysis of Characteristics of Soil Slopeseepage Field Change in Continuous Rain Condition
Authors: He Zhong Ming , Wu Wei , Zeng Ling , Cai Zhong Xin
Published: November 2012

A numerical model is built by Finite Element Software, discussed the effect of rainfall on slope pore water pressure, volatile water content and depth of infiltration in continuous rain condition. The result indicated that when the rainfall intensity and rainfall duration reach a certain condition, the ground water table rises slowly, and mostly, the spill points of ground water locate in the foot of slope. The slope section appears three pore water pressure divisions: transient saturated zone, negative pressure region and hydrostatic pressure area after the rain.
Experimental Research on Sulfate Attack Resistance of Steel Fiber Reinforced Fly Ash Concrete
Authors: Cui Lei , Ge Xiao Dan , Ma Qin Yong
Published: November 2012

Sulfate attack is one of the important factors affecting the durability of concrete. An experimental work had been carried out to investigate the behavior of steel fiber reinforced fly ash concrete (SFRFAC) exposed to sulfate attack in comparison with the plain concrete (PC), fly ash concrete (FAC) and steel fiber reinforced concrete (SFRC).The sulfate resistance of the SFRFAC, PC, FAC and SFRC under sodium sulfate attack of different concentrations were evaluated by measuring the compressive strength and flexural strength. The results show that the sulfate resistance of SFRFAC is higher than those of PC, FAC, and SFRC. With the increase of sodium solution concentration, the compressive strength and flexural strength of SFRFAC, PC, FAC and SFRC decrease first, and then increase.