bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Remote Monitor System for Rural Domestic Sewage Treatment
Authors: Du Yan Hong , Zhang Wei Yu , Chang Ruo Kui , Wang Li , Zhao Jin Cai
Published: July 2013

S7-200 Series PLC supplied by SIEMENS as controller has been adopted in this system, which is based on 3D force-controlled configure software, using GPRS RTU transparent transmission function, to realize the remote monitor for the process, parameter and the operation status of the main equipment of rural domestic sewage treatment. The monitoring & indicating of sewage treatment process, the storage and the query of history memory of various monitoring data, control data and operation data, the generation of data statement and data curve, and the IE explorer remote access monitoring interface have been supported in this system.
The Influence of Heat Treatment on the Properties of Breeding Bio-Container
Authors: Huang Hong Ying , Wu Guo Feng , Sun En Hui , Chang Zhi Zhou
Published: July 2013

An environmental, biodegradable breeding container made from rice hull and starch adhesive was produced by a hot-press machine. The heat treatment was introduced to improve the properties of breeding container. The dry and wet strength, water absorption, FTIR, biodegradation, and thermal stability were tested and discussed. The results showed that curing temperature played a great influence of on the dry and wet strength of breeding container. The dry and wet strength was increased with the temperature rise. The water absorption decreased from 89.1% to 50.9%. Pattern of the peak at 3400 cm-1, 2900 cm-1, 1640 cm -1, 1500 cm-1 and 1050 cm-1 has changed after the heat treatment of specimens. The hydrogen bond was likely produced between straw and adhesive during the heat treatment process. The degradation rate of specimens after heat treatment was lower because the high temperature led to deeper cross-linked reaction. The TGA showed that heat treatment can improve the thermal stability, while the degradability was not changed.
An Approach to Estimating Acceleration Information for Longitudinal Control
Authors: Li Zhi Gang , Zhang Han Lin
Published: July 2013

Most of control systems choose velocity and distance as the control parameters for vehicle longitudinal control in the case where no inter-vehicle communication is available and have poor response capability under urgent conditions. The purpose of this paper is to propose new approach to estimating relative acceleration information for vehicle longitudinal control without inter-vehicle communication. Approach is based on design tracking differentiator to filtering and estimating velocity and relative acceleration signal. But for traditional tracking differentiator with many parameters, the trial and error method is adopted in parameters choose process. The number of tracking differentiator parameter is too many to be used effectively in fact. So, new tracking-differentiator with only one parameter is designed in this paper. Theoretical analysis and computer simulation prove that the designed tracking-differentiator can accurately estimate relative acceleration information.
Hybrid Modeling Method Based on FSPN for Sensor Networks
Authors: Wan Zi Cheng , Zhou Huan , Deng Yi Ping , Li Rong
Published: July 2013

Sensor networks play a central role in the Internet of things, which attracts lots of attentions recently. Mathematical models are of much help to explore intricate scheduling on the sensor node or interactions between different sensor nodes. Although many existing approaches have shown that the sensor network behaves like a hybrid system, where discrete character and continuous character exist together, few of them have attempted to consider two characters together. In this paper, we propose a novel quantitative modeling framework based on Fluid Stochastic Petri nets (FSPNs), and provide comprehensive theoretical analysis to a typical sensor network example. Our modeling framework, which combines advantages of both Stochastic Petri Nets (SPNs) and Hybrid Functional Petri Nets (HFPNs), reflects the hybrid nature of sensor networks, and at the same time eases the problem of state space explosion. The modeling mechanism proposed in this paper constructs sensor network models that are comprised of both stochastic processes and fluid flow approximation technique. From the evaluation, it's shown that the new method performs well.
Multi-Mode Communication Distribution Network Supervisory Terminal Unit Based on Embedded Systems
Authors: Yang Guang , Su Li Ping , Zhao Ru Lin , Wu Jun Sheng
Published: July 2013

Distribution network supervisory terminal unit is widely used in the smart distribution grid construction. To solve the problem that the means of communication is short, a multi-mode communication distribution network supervisory terminal is proposed which can be contactless operated and can collect and transfer local data remotely.
The Fabrication of Fe-Doped TiCoSb Thin Films by Magnetron Sputtering and Rapid Thermal Annealing
Authors: Qin Juan , Sun Niu Yi , Wang Guo Hua , Zhang Min , Shi Wei Min , Wang Lin Jun
Published: July 2013

TiCoSb-based half-Heusler compounds, which are narrow band gap semiconductors with a high Seebeck coefficient, have been intensively studied in bulk form but rarely in thin films. In this article TiFexCo1-xSb (x=0, 0.17) thin films were synthesized on n-type single crystal Si (100) and MgO (100) substrates by DC magnetron sputtering followed by rapid thermal annealing. The X-ray diffraction patterns show that Fe doping does not affect the crystallization temperature of TiCoSb phase, but seem to induce the formation of binary phases like TiSb. Hall measurements reveal that the undoped TiCoSb thin films are n-type semiconducting, while TiFe0.2Co0.8Sb turns to p-type with half-order higher carrier concentration of 1.5×1021 cm-3. The vibrating sample magnetometer spectrum indicate that the TiCoSb thin film is non-magnetic and TiFexCo1-xSb (x=0.17) is weak magnetic.
Quantitative Voltage Control of Large-Scale Wind Base
Authors: Xing Zheng Jun , Kong Xiang Yu , Huang Fei
Published: July 2013

The random variation of wind speed causes active power and reactive power injection of large-scale wind base to fluctuate constantly, this in turn leads to voltage fluctuation and unqualified voltage amplitudes of this area. This article proposes quantitative voltage control to solve this problem. Firstly, analyze the reason and characteristic of voltage fluctuation in large-scale wind base. Then apply sensitivity method to derive voltage/reactive power sensitivity coefficient matrix; this matrix is the product of two special matrices, one is symmetric and the other is diagonal. It can be demonstrated that the symmetric one has a relatively bigger value at the diagonal line; combined with the diagonal one, several simple conclusions can be obtained. According to the conclusions, quantitative voltage control flow can be established. In addition, operating mode of wind turbine generator is taken into account in the simulation process. Simulation results of IEEE 9 nodes system and an actual system demonstrate the validity of proposed measures.
DC-Modulated AC/AC Converters
Authors: Fang Lin Luo
Published: July 2013

Traditional methods of AC/AC converters have general drawbacks: output voltage is lower than input voltage, the input side THD is poor and output voltage frequency is lower than input voltage frequency by using voltage regulation method and cycloconverters. We introduce the novel approach - DC-modulated AC/AC converters in this paper, which successfully overcomes the drawbacks. Simulation and experimental results of the DC-modulated AC/AC converter are the evidences to verify our design. These methods will be very widely used in industrial applications.
A Discussion on the Development of LNG Based on Market Concentration of Natural Gas Consumption
Authors: Zhang Ce Ming , Huang Xiao Mei , Peng Shi Ni , Liao Chang Yin
Published: July 2013

Liquefied natural gas (LNG) is a kind of clean and efficient energy. On one hand import LNG may diversify the energy structure and safeguard energy security for energy consumers, on the other hand the expansion in LNG export may well develop natural gas resources, increase foreign exchange income and promote national economic for energy producers. Therefore, LNG trade is becoming a new hot spot in the global energy market. In this paper, LNG consumption market structure was analyzed based on the popularization ratio of urban gas and consumption concentration of GDP worth of ten thousand yuan. LNG market present situation in China was explained accurately and reasonably.
Composite of TiC-TiB2 Ceramic with Ti-6Al-4V Alloy Prepared by Combustion Synthesis in Ultrahigh Gravity Field
Authors: Cui Hai Long , Zhao Zhong Min , Zhang Long
Published: July 2013

Based on taking combustion synthesis into high-gravity field to fabricate high-hardness bulk solidified TiC-TiB2 composite, layered composite of solidified TiC-TiB2 ceramic to Ti-6Al-4V alloy was obtained by the introduction of Ti-6Al-4V alloy plates at the bottom of graphite crucible. XRD, FESEM and EDS results showed that the layered composite was achieved in multi-scale (micron/submicron/micro-nanometer) and multi-level (TiC1-x-TiB-TiB2 + TiB2-Ti-TiC1-x-TiB + TiB2-TiC1-x-TiB-Ti + TiB-TiC1-x-Ti + TiC1-x-Ti + Ti) graded microstructure between the ceramic and Ti alloy, which was characterized by size and distribution of TiB2 and TiB, thereby paving a new way for developing light-weight materials for special engineering.
Analysis on Unbalance Protection of SCB
Authors: Xiong Xiao Ping , Hu Jing Jie , Fu Qiang
Published: July 2013

Shunt capacitor is a main measure to reactive power compensation of power system, which has the advantages of flexibility and economy. In order to guarantee the safety of shunt capacitor, the methods for protecting against over-voltage, under-voltage, over-current and unbalance in circuits according to the different operation modes are used. This paper in detail introduces unbalance protection ways under different connection modes of capacitor group. It is analyzed and calculated that the unbalanced current and voltage with the effects of fault capacitor units, components and fuses on capacitor bank as well through a case of unbalance computation of shunt capacitor banks (SCB) of ungrounded single star with external fuse. It is indicated by PSCAD simulation analysis that the result of theory calculation is the same as the simulation, which provides theory basis of setting the tripping point and alarm point of relay protection.
Research of Smart Meter Massive Data Storage Based on Cloud Computing Platform
Authors: Li Weng Ting , Zheng Yan , Liu Shao Bo , Long Zhao Zhi , Li Zhi Cheng
Published: July 2013

With the comprehensive construction of the smart grid, the smart grid operation control and interactive service system will be initially formed. The smart terminal of smart grid are smart meters, and they produce a large number of various data all the time. That how to most effectively manage these massive data storage is an important research point for improving the intelligence service. This paper studies the smart meter massive data storage management based on cloud computing platform. The Hadoop distributed computing platform for smart meter massive data management is reliable, efficient, scalable storage.
Study on the Calculated Program of Soil Slope Safety Factor
Authors: Xie Hua Gang , Li Chao , Song Ren Liang
Published: July 2013

Its not flexible and convenient to study the influence of slope surface shape on safety factor by present calculated software, so its necessary to program a new program. Calculated program of homogeneous soil slope are programmed by VC based on theory of limit equilibrium. In the end, the program is confirmed precisely by general examination question.
Study on Influence of Surcharge Preloading on Deformation of Embankment with FEM
Authors: Liu Jie Qun , Chen Lu Wang
Published: July 2013

Based on nonlinear finite element method, the deformation and stability of embankment influenced by surcharge preloading is analyzed. It is shown that the location of the maximal lateral displacement of embankment is changeable at different construction stages. The location of the maximal lateral displacement is nearer the shoulder of embankment with construction of embankment. The lateral displacement and vertical settlement become larger and stability of embankment become smaller, when the location of surcharge loads nearer the axis of symmetry of embankment. Therefore, in order to accelerate the settlement of embankment during construction, surcharge preloading should be located nearer the axis of symmetry of embankment.
Absorbing/Shielding Property of Graphite-FeSi by Mechanical Milling
Authors: Xu Yong Gang , Yuan Li Ming , Cai Jun , Zhang De Yuan
Published: July 2013

Graphite-FeSi absorbents were fabricated by mechanical milling method. The complex permittivity and permeability were measured in frequency 1-4 GHz, and then reflection loss (RL) and shielding effectiveness (SE) were calculated. It was obtained that the graphite was bonded to the surface of FeSi by X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images. The permittivity and permeability could be enlarged as graphite added in the milling process. It was attributed to the excellent conductivity of graphite and interactions of the two particles. The graphite-FeSi composites had a better shielding property (maximum 25.93 dB) in 1-4 GHz as well as the absorbing property at 1GHz than FeSi composites.
The Microstructure of Gradient Composite Bioceramic Coating with Single and Multiple Rare Earth Oxide Fabricated by Wide Band Laser Cladding
Authors: Zhang Ling Yan , Liu Qi Bin , Jiang Pei Ze , Zhang Zheng
Published: July 2013

To improve bonding strength between Ti alloy and bioceramic coating and to eliminate thermal stress during laser cladding, gradient bioceramic coating materials is designed. The bioceramic coating is fabricated by wide band laser cladding technique. And the effect of adding single and multiple rare earth oxide on microstructure is investigated. The samples are soaked with SBF for 14 days, the experimental results indicate that when the content of single rare earth oxide is 0.6wt.%Y2O3, a large number of bioactivity phase and chrysanthemum shape microstructure can be observed. When the content of single rare earth oxide is 0.2wt.%Sm2O3, a lot of bioactivity phase and coral reef shape microstructure can be observed. When the content of multiple rare earth oxide is 0.3wt.%Sm2O3 and 0.4wt.%Y2O3, a large amount of bioactivity phase and more homogeneous and dense spherical particles can be observed on coating, which demonstrates the microstructure is of better bioactivity.
Computer Simulation on Conformation Properties of Polymer Chain
Authors: Cui Lin Lin , Guan Hua Nan
Published: July 2013

The author adopts Monte Carlo compute method to simulate the linear polymer chain lattice model in multiple chain systems of chain length n=20, 50, 100 while the volume fraction Φ=0.125, and makes a research on the variational situation of the size (measured with the mean-square end-to-end distance  and the mean-square radius of gyration ), shape (measured with the mean asphericity factor ) with changing of the interaction energy between solvent molecule and polymer chain segment molecule εPS. Results indicate ,  and  have the changing rules that they become small with the increase of the εPS
The Properties of the Al-Doped ZnO Thin Film Prepared by Magnetron Sputtering
Authors: Huang Wei Hua , Zhong Guo Wen , Su Li Ping , Li Tan
Published: July 2013

Pure and Al-doped ZnO thin films were deposited by radio frequency magnetron sputtering at room temperature on n-(100) Si, fused quartz and Pt/Ti/SiO2/Si substrates. Structural, optical and electrical properties of the prepared thin films had been characterized. The X-ray diffraction results indicated that all the films had (002) preferential orientation. The AFM and SEM images showed that the surface of the films was smooth, crack-free and pore-free, the interface between the film and the substrate was sharp and distinct. From the transmission data the band gap energy Eg of the film increased when doped with Al2O3, and the transparent was still high (above 80%). The current voltage characteristics indicated that doping with Al2O3, the leakage current of ZnO thin films increased rapidly and the films acted as a conductive.
Oxidation and Storage Properties of Stable-Oxidative-Poly-Si-Fe (SOPSF) Coagulant
Authors: Fu Ying , Wang Yan Zheng , Yu Yan Zhen , Tan Juan , Shi Nan
Published: July 2013

A poly-Si-Fe (SOPSF) coagulant which have good oxidizing capacity and long storage time was prepared by copolymerization. The oxidation-reduction potential (ORP) value and storing time of SOPSF were explored in comparison with those of poly-Si-Fe (PSF). The results showed that SOPSF and PSF had stronger oxidizing function than Polyferric aluminum (PFA), and SOPSF had better storing stability than that of PSF at different temperatures and different concentrations.
The Researches on Preparation of Polysilicate Coagulants from Fly Ash and its Application in Water Treatment
Authors: Zhou Yu Xing , Yu Yan Zhen , Wang Juan Ting
Published: July 2013

Introducing the main compositions and properties of fly ash, and review extraction methods of Si,Al and Fe from fly ash, compare the molecular structure and water treatment results among polysilicate flocculants, PFS and PAM, describe preparation methods, conditions and water treatment results of the polysilicate flocculants with the extracts. At last, providing some advices on how to gain flocculants with better remarkable coagulant performance.
Mechanism Reduction of Hydrogen Production from Dimethyl Ether Partial Oxidation by Plasma Reforming
Authors: Song Ling Jun , Li Xing Hu
Published: July 2013

Chemical reaction kinetic model of hydrogen production from DME partial oxidation by plasma reforming was found. Mole fractions of main products of DME partial oxidation by spark plasma as the function of inlet gas flow rate were calculated at atmospheric pressure and ambient temperature. Comparing the results of calculation and experiment, the model was proved to be correct. The mechanism research was done by the method of sensitivity analysis and rate of production. The reduced mechanism which includes 16 species and 13 radical reactions was done. The calculation results of reduced mechanism and detailed mechanism were close. The result shows that the reduced mechanism can be used in chemical reaction kinetic calculation of hydrogen production from DME partial oxidation by spark plasma reforming.
Optimization on the Preparation of Heat-Resistant Cotton Stalk Bast Fibers Reinforced PLA Composites by Response Surface Analysis
Authors: Wei Chun Yan , Wu Zheng , Xue Xiao Tong , Cui Yong Zhu , Sui Yan Ling
Published: July 2013

Response surface analysis was applied to optimize the processing of preparing the heat-resistance of the cotton stalks bast fiber reinforced PLA composite. Effects of all factors were evaluated and three factors were selected, which were addition of TAIC, mass fraction of fibers and length of fibers. Subsequently, response surface analysis based on Box-Behnken experimental design was employed to evaluate the interactive effects of three factors. One mathematical model for the processing of composites as functions was established. The results showed that the optimal processing was that the addition of TAIC was 2.1%, the mass fraction of fibers was 26.7%, the length of fibers was 11.7mm, and the HDT of composite was 161.39°C. Under the optimal conditions, the true value was close to the predicted value.
The Die Design and FEA Analysis of Equal Channel Angular Extrusion
Authors: Gao Lei Lei , Zhang Jin Zhong
Published: July 2013

Equal channel angular extrusion (ECAE) is a process used to introduce severe plastic deformations (SPD) to processed materials with the aim of improving their mechanical properties by reducing the grain size. In order to investigate the effect of die angle on stress and strain produced by ECAE, a new die was designed and the finite element analysis (FEA) was carried out to simulate the ECAE process. The new die is comprised of one internal mold, two external molds and one pressure rod. The main advantage of new die is it can be used for different die angle wihout changing the external mold. As a reult, the new die design reduces the tool cost and improve the ECAE process efficiency. The FEA results show that shear deformation occurred during ECAE, and the maximum effective strain was about 1.669 locating at bottom of the workpiece.
Electronic Structure and Optical Properties of ZnO with Antisite Defects
Authors: Xie X.J. , Wang W.H. , Li L.Y. , Luo X.G. , Cheng Y.H.
Published: July 2013

We investigate the electronic structures and optical properties of ZnO with antisite defects OZn using the density function pseudopotential method. Our results show that the Fermi level shifts into the conduction band after introducing one or two OZn defects into ZnO supercell, indicating that the system displays a metallic-like characteristic. Moreover, the antisite defects lead to a redshift of the optical absorption edge and obvious optical absorption in the visible light region. Especially, the optical properties are influenced by the configurations of two OZn defects in our considered ZnO supercell. The strongest optical absorption occurs when the two defects are connected by-Zn-O-Zn-bond in the ab plane. These findings are possibly applicable for designing new optoelectronic and photoelectrochemical devices with improved low energy light absorption.
Annealing-Induced Transformation of Defects in ZnO Single Crystal and the Effects on the Optical Properties
Authors: Li Wei Feng , Feng Xi Qi
Published: July 2013

ZnO single crystals were prepared and then sequentially annealed from 573 to 1073 K in air atmosphere. Optical transmittance spectra (OTS), X-ray excited luminescence (XEL), and photoluminescence (PL) were measured before and after each step of annealing. The lower temperature annealing can enhance the emission but hardly affect the optical transmittance. Contrarily, higher temperature treatments ameliorated the transmittance but degraded emission. Based on experimental results, the blue and green emissions, as well as the 400-500-nm absorption were assigned to isolated zinc interstitial, zinc vacancy and oxygen vacancy in ZnO, respectively. In addition, the defect complexes play important role on optical properties of ZnO crystal. Our results provide further insight into understanding defects and defect complexes in ZnO crystals.
Effect of Laser Power on Stability of Laser-Twin-Wire Hybrid Welding Process
Authors: Gu Xiao Yan , Li Huan , Li Lin Jie
Published: July 2013

Based on the chaos theory and related algorithm, largest Lyapunov analysis of current of laser-twin-wire pulse MIG welding process are performed from the point of view of nonlinear time sequence. Largest Lyapunov exponent (LLE) of characteristic current under different laser power were calculated, meanwhile synchronous high-speed photography was adopted to observe arc shape and droplet transfer. The results indicate that arc shape and the force state of droplets changes as a result of interactions between laser plasma and arc plasma. Addition of low power laser intensifies the interplay of two arcs, which decreases the stability of welding process. When laser power reaches to a certain extent, a stable cathod spot and a conductive channel are obtained for arcs. Stable welding process and small welding spatter are acquired.
Experimental Study on Coal Pore Characteristic Based on Cryogenic Liquid Nitrogen Method
Authors: Cheng Wei Min , Zhang Xiao Qiang , Zhang Rui , Wang Gang
Published: July 2013

In view of pore distribution in coal, this paper applies BJH method that is based on the cylinder theory and adopts cryogenic liquid nitrogen adsorption method to carry out experimental investigation on pore structure of No.3U coal seam in Sanhekou Coalmine, obtaining the fact that pore structure of No.3U coal is complicated, the cool pores are mostly flask pores, others are the parallel plate pores with one end closed and the cylinder pores with one end closed; According to the distribution of BJH pore volume and pore surface area, ultramicropores with apertures less than 10 nm are among the most; Then obtain the average BET specific surface area, the distribution of BJH pore volume and pore area, average single-point total pore volume and most probable pore .etc, which conducive to a better understanding of the micropores characteristic of coal.
Numerical Calculation for Three Dimensional Flow Field of Servo Hydraulic Driving Mechanism
Authors: Yu Ming Rui , Han Wei Shi , Wang Ge
Published: July 2013

A servo hydraulic driving mechanism was designed using servo-tube control principle, this mechanism can move continuously and position accurately. The three-dimensional flow field of the drive cylinder is calculated and analyzed. The results indicate that the driving mechanism can effectively control the differential pressure of the system by changing the gap of the variable throttle orifice, the diameter of servo-tube is as small as possible. When the gap of the variable throttle orifice is less than a certain millimeter, the control effect is more obvious.
Nonlinear Analysis of Rotor-Stator-Bearing System Unsteady Oil Film Force
Authors: Liu Gui Zhen , Yu Ying , Wen Bang Chun
Published: July 2013

According to the LaGrange energy equation, the establishment of the unsteady oil film force of the rotor - stator - bearing system dynamics model, the application of numerical method, the system with the speed change time domain waveforms, amplitude spectra and Axis Orbit, the results show that: the unsteady oil film force and speed of change is closely related to changes in the process of oil film force oil whirl Oil Whip. Provide a theoretical basis for effective diagnosis of rotor - stator - bearing oil film instability fault research.
Improvement and Taper Optimal Design of the Hydraulic Fast Connector
Authors: Xiang Heng Fu
Published: July 2013

Improvement design was carried out to resolve the issue about easily damaged and difficult repaired planar seal for hydraulic fast connector. Through adding a taper on male connector and female regulating part on female connector, the co-planar seal was changed into the taper seal which the seal was more reliable. When the contact surface was worn, it can be resealed by adjusting the female regulating part. Taper seal was key to design the reasonable taper. In order to acquire the best taper, taper optimal design was carried out using finite element technology, the relationship between maximum contact stress and tape was gained. Simulation results showed that the best taper could be gained when the big-endian radius of the taper was 11.82 mm.
Study on the Impact of Two Kinds Modification Methods on the Dimensional Stability of Poplar
Authors: Feng Zhi Bo , Zou Guo Zheng , Chen Gang , Cai Jia Bin
Published: July 2013

Fast-growing poplars are used as test materials in this study, which are respectively first carbonized then impregnated treatment and carbonized treatment, to test the dimensional stability of modified wood. The results show: the shrinkage rate of specimen which is first carbonized then impregnated is higher than the control group as much as 87.80% ~ 89.16% in radical direction, 76.20%~82.43% in tangential direction; from oven-dry state to air-dry state, the swelling rate of specimen is higher than the control group as much as 5.26% , 9.09%, and to saturated state, the rate is lower than the control group as 14.55% and 0.13% respectively in radical direction and tangential direction, as a result, the characters of shrinkage and swelling are not improved. When carbonized, the shrinkage rate of specimen is lower than the control group as 3.01%~8.47% and 5.08%~5.86% respectively in radical direction and tangential direction; the swelling rate is lower than control group as 23.84%~41.05% and 12.01%~43.75% respectively in radical direction and tangential direction, as a result, the character of shrinkage is poorly improved but swelling is obviously improved. After the two modified treatments, moisture absorption rate is respectively 6.99% and 4.91%, both lower than the control group8.80%; moisture resistance rate respectively 20.57% and 44.20%; water absorption rate 107.27% and 123.74%, lower than the control group 210%; resistance to water absorption up to 48.92% and 41.08%. Know then, carbonization treatment is better in terms of the affect on improving dimensional stability of wood.
Simulation and Optimization of a Permanent Magnet for Small-Sized MRI by Genetic Algorithm
Authors: Cheng Yi Yuan , Xia Ling , He Wei
Published: July 2013

The main magnet produces the main magnetic field in the imaging area as one of the important parts of the magnetic resonance imaging (MRI) system. In a permanent MRI magnet, the widespread end effect causes a non-uniform magnetic field distribution and affects the imaging quality. In this paper, an H-type permanent magnet for small-sized MRI applications was designed; in particular, we added an optimized shimming ring outside the pole piece to improve the magnetic field uniformity. Genetic algorithms are used to solve the complex and nonlinear calculation of the magnetic field. The simulation results show that the magnet optimized by the proposed method generates a homogeneous magnetic field that can be easily implemented in practice.
The Gas Injection Control of CNG Automobile Based on BP Neural Network
Authors: Chen De Hai , Cao Wei Feng , Zhang Tian
Published: July 2013

Compressed natural gas (CNG) automobile is an emerging new energy car. How to control gas injection is the key technology of CNG electronic control system. At present, the control based on the MAP graph is used usually, but this control method has some shortages, for example larger data, poor adaptive capacity and difficulties in data updating. BP neural network control has adaptive and self-learning, nonlinear processing ability and high generalization, and faults tolerant ability in processing information. In this paper, BP neural network is used to control natural gas injection in order to solve the shortage of the MAP picture control. Simulation experiment shows thefeasibility and advantage of this method.
Cigarette Filter Rod Parameter Measure Based on Otsu Image Processing
Authors: Yang Shu Bin , Jin Lu , Zhang Ling Han , Fu Shu Long
Published: July 2013

Traditional contacting measure method can easily cause cigarette filter rod distortion and needs long measure time. Its measure precision is difficult to satisfy practice demand and it cannot implement online measure. In order to overcome these shortages, imaging measure technology is used to measure cigarette filter rod parameters. Firstly, preprocessing filtering is operated on the image acquired from imaging measure system. Then binary cigarette filter rod target image is obtained through Otsu segmentation method. After that target feature extraction is processed and correlative parameters of cigarette filter rod are gained. Parameters measuring absolute error for two images which are acquired from the same cigarette filter rod under different illumination is 0.683%. Experiment proves that the proposed method can rapidly and correctly measure cigarette filter rod and has good robust and adaptability. It can effectively measure cigarette filter rod in practice.
Luminescent and Photocatalytic Properties of BaCoF4: Ce3+ Synthesized by Reflux Method
Authors: Han Yan Xia , Yang Qiu Hua , Shen Hai Yun
Published: July 2013

The complex fluorides BaCoF4 and BaCoF4: Ce3+ were synthesized by reflux method in ethylene glycol and characterized by means of XRD, TEM, XPS, UV-VIS and Fluorescence Spectrophotometer. In addition, the photocatalytic degradation property of BaCoF4: Ce3+ was investigated. The results indicated that the mean particle diameter of BaCoF4 was 54.6 nm. Only adsorption oxygen (α oxygen) existed on the surface of BaCoF4 and the content of surface oxygen was 5%. The BaCoF4: Ce3+ had a stronger absorption at 250 nm, which could be explained by d electronic transition of Ce3+. The maximum emission peak of BaCoF4: Ce3+ was 361.8 nm in its luminescent spectrum, and emission band of Ce3+ belonged to 5d4f transition. Meanwhile, the degradation rate of acid red 3B by BaCoF4: Ce3+ reached 98.7% after being lightened for 2 h by a 450 W high pressure mercury lamp.
Using Model Checking to Verify the Logic Module of Flight Control Software
Authors: Yang Shun Kun , Li Guo Qi
Published: July 2013

Model checking is an important method to verify state machine based system. In this paper, we using PAT, a novel and powerful model checking tool, to verify the logic module of flight control software, which is public available. Conclusions are drawn from the verification and these are valuable for similar researches.
The Design of Temperature Control System for Rice Wine Fermentation
Authors: Zhang Sheng Yi , Wang Xin Ming
Published: July 2013

Fermentation temperature is the key to decide the quality of the rice wine, so thetemperature controlling system in fermentation room is established base on stm32 microcontrollerand digital temperature sensor. The whole block diagram for the system is firstly detailed, and thenthe Temperature collecting module and temperature control module are also described. At last thesoftware flow chart is discussed. The experiment is done based on designed system, and the data isanalyzed. The result show that designed system can realize high accuracy temperature controlling.
Application of Uncertain Information Fusion in Diagnosis Decision of Electronic Equipment
Authors: Luo Jin , Deng Qi Bin
Published: July 2013

Focuses on how to dispose the multi-source uncertain information and promote the testability evaluation and fault diagnosis capability of the electronic equipment, this paper uses fuzzy theory in the uncertain information description and modeling. Based on the fuzzy set description of fuzzy target, new method is proposed to obtain fuzzy evidences from fuzzy fault features, and then, Dempster-Shafer combination rule are used to fuse multi-source fuzzy evidence to get diagnosis results. The proposed method of fuzzy evidence extraction can reduces uncertainties in fusion makings and improves fault identifications, and the fusion diagnosis method based on multi fuzzy evidence matching enhances the precision and reliability of the system fault diagnosis decision furthermore.
Study on Museum Robot Trajectory Planning Based on the Controlled Path
Authors: Li Ping Cai , Guan Hao , Wang Yan Ying
Published: July 2013

Museum commentary robots usually have many functions, such as man-machine interaction, open language mode, actions show, and so on. The robot introduced in this paper uses cameras, infrared sensors and MP3 module to realize interpreting function and motion in accordance with the desired trajectory in the museum. This work makes up the blank space our school museum commentary robot and is benefit to promote students positivity for museum knowledge. At the same time, this work will lay the foundation of next step commentary robot with open language mode and facial expression.
Density and Surface Tension of Bi2SiO5 Melts
Authors: Guo Hong Wei , Mo Zu Xue , Wang Xiu Feng , Zhu Chang Ren
Published: July 2013

Metastable crystal Bi2SiO5 has significant properties including dielectric, thermoelectricity and nonlinear optical properties. Metastable crystal Bi2SiO5 has been successfully prepared by melt cooling method in this study. Surface tension of high-temperature melt Bi2SiO5 was measured by Suspension method; metastable crystal Bi2SiO5 construction was assigned by IR(Infrared Radiation). The experimental result showed that Bi2SiO5 flux density decreased with the increasing temperature in 830-1095°C range; surface tension changed quadratic with the decreasing temperature. The [SiO4]4- anions of Bi2SiO5 originated from the isolated [SiO4] tetrahedron in the glass to a chain connected structure.
Output Feedback Control of NCS with Communication Constraints
Authors: Chen Hui Ying , Li Zu Xin , Wang Pei Liang
Published: July 2013

Considering the influence of communication constraints and uncertain short delay, this paper models NCS with communication sequence as a discrete periodical switching system with uncertainty, which integrates information scheduling and control. Using the method of piecewise Lyapunov function and the switching system theory, the asymptotic stability condition of the system with periodical information scheduling is derived in the form of matrix inequalities, and a output feedback controller design method is derived.
Effect of Cladding Current on the Properties of Ti (CN) Ceramic Coating
Authors: Zhang Li , Hao Jian Jun , Ren Jun Hai , Li Jian Chang , Ma Yue Jin
Published: July 2013

In order to study the properties of Ti (CN) ceramic coating, nitrogen arc cladding technology was carried out using TXII500 argon arc cladding machine in nitrogen gas atmosphere, and TiCN based composite coating was preparated on the Q235B specimen surface which is precoated titanium powder and graphite powder. The molten coating was tudied under the cladding current respectively in 200 A, 220 A and 240A. The microstructure, phase composition, micro hardness and wear resistance were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness tester and reciprocating friction testing machine. The results show that the generation of the Ti (CN) phase is the most when the cladding current is 200A, The microscopic hardness of the coating is reduced with the increase of current, which provides a theoretical basis for the optimization of the process further.
Modeling and Simulation on Temperature Control System of Farm Products Baking Equipment
Authors: Liu Jun , Jia Zhen Wei , Guo Rong Xing
Published: July 2013

In order to design a kind of temperature control system of the equipment used for baking farm products. The main function of the system is controlling the temperature in the baking room, ensuring it varies with the technological requirement. First, establish the system state equation based on the Fouriers Law. Then, set up the parameters such as the norms of the baking house, the thermal resistance of the wall and the air velocity in the baking house. As the model was established, input the technological temperature cure. The response curve shows that this system could satisfy the requirement of the process technology.
An Intelligence Sliding Mode Controller Based on Nonlinear Disturbance Observer for Rotary Steering Drilling Stabilized Platform
Authors: Zhang Yuan Tao , Yi Jun
Published: July 2013

An intelligence sliding mode controller for rotary steering drilling stabilized platform based on nonlinear disturbance observer is presented. Nonlinear disturbance observer which can converge exponentially with suitable design parameters is used to obs erve the uncertain disturbance of stabilized platform under work condition. Sliding mode controller is designed to guarantee the robustness of the closed-loop system. The adaptive rate of switching gain is designed and sign function is replaced by bipolar sigmoid function to weaken chattering. Finally, genetic algorithm is applied to search the optimal controller parameters, including switching function coefficient, switching gain adaptive coefficient, sigmoid function coefficient and observer coefficient. Simulation results show that nonlinear disturbance observer can observe the uncertain disturbance effectively, controller output is decreased and stabilized platform can get optimal control performance and robustness.
Optimization of Hybrid Electric Bus Control Strategy with Hybrid Optimization Algorithm
Authors: Gao Jian Ping , Liu Zhen Nan , Guo Zhi Jun , Wei Yue Hui
Published: July 2013

control strategy is one of the most decisive techniques in Hybrid Electric Bus (HEB) and directly influences the dynamic performance and fuel economy. For achieving the best fuel economy and keeping the battery for a long time, First, power analytic control strategy was built; then, the hybrid optimization algorithm (HOA) based on Multi-island genetic Algorithm (MIGA) and NLPQL was built by ISIGHT software. HOA is adopted in control strategy parameters of HEB optimization. The results show that the best result can be obtained in few iterative times by HOA, the calculation time was reduce by 12 hours, the fuel economy was improved by 12% and find the rules between control strategy parameters and fuel economy the balance of the battery state of charge (SOC).
Path Planning of Multi-Robot Fish Based on Cooperative Game Model
Authors: Jia Xue Lei , Yang Xu Qiong , Deng Yan Song
Published: July 2013

In order to improve the sense of cooperation of robotic fishes between each other to complete the task with high efficiency, this paper presents a path planning method for multi-robot fish based on the cooperative game model. With a mathematical model established on the cooperative game which is based on the game theory, the robotic fish in this system corresponds to the other participants in the game, benefit function of the game player on the cooperation model of multi-robot fish path construction is studied in this paper, which gets system Pareto optimal solution, then getting the optimal path of the entire system. Using the above method, the authors simulate and analyze on the robotic fish in water 2D simulation platform, and to use Matlab to simulate robot fishs track. The results of analysis indicate: Applying the path planning theory in the multi-robot fish movement system is effective and feasible, and that avoids planning only a single robotic fishs optimal path in the system, while leaving the movement of system in the beneath coordination.
Backstepping Based Adaptive Control of Magnetic Levitation System
Authors: Zhou Wei , Liu Bao Bin
Published: July 2013

In view of parameter uncertainty in the magnetic levitation system, the adaptive controller design problem is investigated for the system. Nonlinear adaptive controller based on backstepping is proposed for the design of the actual system with parameter uncertainty. The controller can estimate the uncertainty parameter online so as to improve control accuracy. Theoretical analysis shows that the closed-loop system is stable regardless of parameter uncertainty. Simulation results demonstrate the effectiveness of the presented method.
Vibration Analysis and Control of an Active Power-Train Mount System
Authors: Sun Guo Chun , Guo Hui , Xu Li Xin
Published: July 2013

In order to improve the property of automotive power-train vibration isolation, reduce the vibration that is transmitted by the power-train to the vehicle chassis, we adopt an active control mount (ACM) which consists of elastic rubber and piezoelectric stack actuator in the system. A hydraulic mechanism is used in the ACM to achieve higher displacements. Through the analysis of the property of the rubber and piezoelectric stack actuator, a mechanical model of the active vibration isolation system with the active mounts is established. An optimal control algorithm is presented for engine vibration isolation system, the controller is designed according to linear quadratic regulator (LQR) theory, the linear quadratic performance index is composed of the vertical acceleration, pitching angular acceleration, and rolling angular acceleration of the chassis and the control signals. Simulation results show that active control system of ACM, effect in reducing body vibration than the passive system is obvious.
Used Surface Plasma Wave Measure the Thickness and the Negative Permittivity of Nanometal Film
Authors: Jiang Rong , Huang Zhi Xun , Shen Nai Cheng , Liu Xin Meng
Published: July 2013

In this paper we used He-Ne laser with 632.8nm and prism with aurum film to do the experiment, used Kretschmann configuration excite the surface plasma waves (SPW) on the prism with aurum film,and measure the attenuated total reflection (ATR) spectrum. The thickness of the nanofilm and the negative permittivity of the aurum were obtained.
Constraint and Motion Analysis of a Hybrid Mechanism
Authors: Huang Xiao Ou , Liu Jing Fang , Yu Yue Qing
Published: July 2013

The most basic understanding for a new mechanism is to realize its mobility. But there is little theory about mobility of hybrid mechanism in kinematics. Due to the complexity and particularity of hybrid mechanisms, the mobility of hybrid mechanisms cannot be obtained based on traditional methods. In the paper, the constraint and mobility of a dendritic-hybrid mechanism is analyzed based on screw theory. The complicated loops in the dendritic-hybrid mechanism are regarded as generalized kinematic chains, which can simplify the hybrid mechanism and correctly receive the number and characteristic of mobility.
A Hybrid Testing Method to the Application of Test Case Generation of the Simulation of CTCS-3 On-Board Subsystem
Authors: Feng Kang , Li Kai Cheng
Published: July 2013

As an important part of the CTCS-3 train control system, the on-board subsystem is a safety critical system, and it plays an important role in assuring the safety of train. In this essay, we choose a hybrid testing method combined with the advantage of black-box and white-box testing method in the test of the Simulation of on-board subsystem of the CTCS-3 train control system. The main idea is to divide the tested system into several functional parts, and then test them step by step. At last, we use an example to show the advantage of this testing method in reducing the number of test cases.
1 Current situation in the testing of train control system at home and abroad
Train control system plays an important role in ensuring the operational safety of the train, At home and abroad researchers attach great importance to the testing of the train control system, and also a lot of research has been done. The simulation test makes it easier for the testers to work in the lab instead of the field, so that it reduce the human and material costs, and the test environment can be controlled and repeatable easily. Besides, the special environment of the site can also be simulated.
University of Florence in Italy has developed the loop of the ATP / ATC test system based on the simulation technology HIL (Hardware in Loop), it provides an effective solution to the test of ATP speed measurement device.
CEDEX LIF laboratory in spain simulation has used the test method of simulation to establish the Eurocab test platform, and developed a number of testing tools, moreover, they have defined test sequence. Test sequence generation and viewing, test management and test result analysis and evaluation function have also achieved.
Beijing Jiaotong University in China rail traffic control and security National Key Laboratory of CTCS-3 train Control System has also established simulation test platform, so that simulation test can be performed.