bluuebunny/crossref_metadata_2025 huggingface dataset:
Paper Moisture Rate Measurement Based on the Spectral Analysis
Authors: Yu Dian Hong , Li Lin , Cao Lin Hai , Zhao Kai
Published: September 2012

In order to solve the online measurement problem of paper moisture rate technical specification, the moisture rate measuring technique based on the infrared spectroscopic analysis is researched in this paper. The basic law on the spectral absorption of medium is expatiated and the problems applying the law to the moisture ratio measurement are also analyzed. The key technology that can realize the ratio on-line measurement by means of two spectral lines (measuring spectral line and the reference line) is explored. The measurement project is designed and the role of the main functional module in the project is discussed. The corresponding experimental research is carried out. The analysis results are given.
Spreading of Epidemics on Scale-Free Networks with Time Delay
Authors: Wang Yuan Mei , Li Tao
Published: September 2012

In the SIR model once a node is cured after infection it becomes permanently immune,but we assume this immunity to be temporary. So we obtain an epidemic model with time delay on scale-free networks. Using the mean field theory the spreading threshold and the spreading dynamics is analyzed. Theoretical results indicate that the threshold is significantly dependent on the topology of scale-free networks and time delay. Numerical simulations confirmed the theoretical results.
Numerical Simulation of Aerodynamic Behaviors of High-Speed Trains Crossing
Authors: Zhang Yong Chang , Xu Yu Gong , Qin Fang , Cao Rui
Published: September 2012

A model of CRH2 high-speed train has been established and the aerodynamics process of moving high-speed trains has been numerically simulated by using moving gird technology of CFdesign, Two kinds of operating condition, both trains have uniform and un-uniform velocity, were considered to analyze the aerodynamics pressure on the surfaces of the train. Finally, according to the calculation results, regularity of how the position where the highest pressure wave was located and its peak value change with the velocity increasing is concluded.
Traffic Fuzzy Controller's Improvement Based on Self-Adaptive Optimal Algorithm
Authors: Xu Zhi Yi , Guan Da Lu , Fan Ai Long
Published: September 2012

The transport system is a nonlinear, time-varying, lagging large-scale systems. Fuzzy control does not need to build a precise mathematical model, can be easily integrated people's thinking and experience, and is suitable for applications in the traffic signal control system. Here,a self-adaptive optimal algorithm was used to improve the traditional fuzzy controller. Simulation results show that the improved system has higher availability.
Research of Feature Recognition Method Based on STEP-NC
Authors: Zhang Jian Chao , Wang Jun , Liu Tao
Published: September 2012

To achieve the numerical control (NC) system based on the standard for the exchange of product model data-numerical control (STEP-NC), the feature concept and feature recognition method of STEP-NC is proposed. The meaning of feature in STEP-NC, while the three classification methods of STEP-NC feature were also presented. The expression methods of STEP-NC feature were analyzed in details. Furthermore, the feature recognition methods based on above the analyse were described. Finally, we simulate several machining features on STEP-NC milling simulation system. The simulation results demonstrate that the feature recognition method is correct and feasible.
Research on Unmanned Aerial Vehicles Autonomous Soft Landing Based on Optimal Control
Authors: Xu Ze Yin , Xia Xiao Hu , Ge Yun Jian
Published: September 2012

This paper deals with the autonomous soft landing of unmanned helicopter aiming to enhance its application. Soft landing means to reduce the shock force upon ground during the helicopters land. Helicopter is a multi-input multi-output system and for which optimal control provides graceful and coordinated controls. Firstly, the experimental platform configuration for autonomous soft-landing system is introduced, which is based on the model helicopter. The time-varying gains and time-varying quadratic performance index Linear Quadratic control for autonomous soft landing of miniature helicopter is applied to unmanned helicopter. Simulation shows that the outputs of the system can respond the input signals accurately.
The Modeling and Simulating of Conveyor Belt Based on ADAMS
Authors: Luo Xin , Li Ting , Hu Bin , Zheng Min , Peng Qiang Ji
Published: September 2012

This problem that the study of conveyor belt performance majority still remain in the calculation of static characteristics, only a few studies on the dynamic modeling and simulating, Using Finite Element Analysis（FEA）,by ADAMS software establishing a model of the dynamic characteristics of conveyor belt, then the model is validated, the results show this method to establish the model is consistent with the characteristics of the theory, and can meet the requirements of the dynamic study.
The New Measurement and Calculation Method for Dynamic Parameters of DC Motor Based on dSPACE System
Authors: Li Qiang , Chen Wei , He Ren
Published: September 2012

To investigate the accuracy of modeling DC motor, the platform for measurement and calculation dynamic parameters is built by the Hardware-In-the-Loop(HIL) method based on dSPACE system. The running state of DC motor has to be changed with adjustment of PWM duty-cycle using ControlDesk software. Having got measurement and calculation parameters value of DC motor, we compare the test results with simulation value using the model of DC motor with cascade control in Matlab/Simulink software according to the classical mathematical model. It confirms the established model of DC motor accurately and reliability using new parameters, which provides the basis of more complex control algorithms and also indicates that the feasibility and generalization application value of measurement and calculation method for DC motor.
Running Speed Analysis of Car on Dual Strop Ropeway with Headwind Load
Authors: Yang Xue Chun , Liu Zheng Hao
Published: September 2012

This paper indicates the influence on the operation of the strop ropeway under the action of headwind, and establishes a curve equation of strop ropeway with wind load in accordance with static balance theory. It makes a dynamic analysis on bi-cable tackle under the action of headwind load, and determines the acceleration of the tackle under wind load. Meanwhile, it analyzes the whole course of the bi-cable strop ropeway, the influence of the wind load on the running speed and result of the strop tackle under the headwind. The paper summarizes the calculation process for the speed of bi-cable strop tackles under different conditions and finally tested and verified it through illustration.
The Application of Data Mining in the Ore Mixing of Sintering Process
Authors: Tang Rui Yin , He Hong Kun , Li Jian Wei
Published: September 2012

The article indroduced the system of ore mixing of sintering based on data mining. Appled the method of cluster to the saved history data of the sintering process to classfy the history data into three category. Every new sample should be put into the Corresponding cluster by the distance of Eucliden, at the meantime, find the nearest proportioning ore case, and the quality index of the new sample is same with the nearest case. The method is more useful and easy.
Flour Bag Counting System Based on Machine Vision
Authors: Ma Chun Xia , Song Wen He , Wu Jun , Wang Yue , Xiao Zhi Tao
Published: September 2012

According to the specific characteristics of Flour Plant production line, the bag counting system for Flour Plant based on Daheng Image acquisition card DH-CG410 and Microsoft VC++ 2005 platform is designed. Using digital image processing technology, the system can be used to detect flour bag by analyzing real-time acquisition video of the flour bag. So it is available for flour production counting. Test results show that the system has the advantages of stable working state, high detection accuracy, high processing speed. It can systematize and standardize the Flour Plant flour bag counting process.
The Design and Implementation of Online Meal Ordering System
Authors: Fang Shuo Jin , Mao Ke Ji , Shen Jian
Published: September 2012

With the upgrading of information industry and the development of Internet, different kinds of network applications are available to thousands of families. E-commerce, which is a new consumption mode based on Internet, emerges and spreads rapidly. Nowadays, people are care about food safety and convenience, and are so busy that the best choice for having meal is home delivery. Therefore, design a restaurant online meal ordering system is significantly important for people. This paper focuses on the design and implement of the online meal ordering system.
Generalized H2 Filtering for Discrete-Time Switched Systems with Multiple Time-Varying Delays
Authors: Zhang Rong You , Zhang Ni
Published: September 2012

The generalized H2 filtering problem is investigated for linear discrete-time switched systems with multiple time-varying delays. By constructing the piecewise Lyapunov-Krasovskii functionals, employing Jensen inequality and slack variables, the delay-dependent sufficient conditions are derived for the filter-error system to be stable with a H2 performance. Based on the established results, the filter design method is presented in terms of the linear matrix inequalities (LMI). The design procedure is brief and easy to compute. The optimal filter can be solved with LMI toolbox of MATLAB directly. Finally, the simulation results illustrate the effectiveness and feasibility of the proposed method.
Kinetics Analysis of Direct Nitridation of Silicon Powders at Atmospheric Pressure
Authors: Yin Shao Wu , Wang Li , Tong Li Ge , Yang Fu Ming , Li Yan Hui
Published: September 2012

Silicon nitride powders were prepared via direct nitridation of silicon powders diluted with -Si3N4at atmospheric pressure. The nitridation temperature and time were ranged from1623K to 1823K and from 0 minute to 20 minutes respectively. Based on the relations between the conversion rate of silicon and the time at different temperatures, and using shrinking core model, a simple model for the reaction between silicon and nitrogen was derived. The model showed that the relations between the conversion rate of silicon and the time displayed asymptotic exponential conversion trend. Using this model, the kinetics parameters of nitridation of silicon powder at atmospheric pressure were calculated, including pre-exponential factor in Arrhenius equation, activation energy, effective diffusion coefficient, and the formula of the reaction rate constant.
A Special Nonlinear Processing Method of Precise Digital Temperature Measurement with Platinum Thermistor
Authors: Li Gang
Published: September 2012

The nonlinear rectifying method is widely used for improving the accuracy of temperature measurement. Using industrial platinum thermistor, DT-1000 digital multi-meter and other common components, a special nonlinear processing method puts forward to achieving high accuracy digital temperature measurement within the medium temperature range. The result shows the effectiveness of the method.
Faraday Rotation Spectra Analysis on TbYbBiIG Crystals in Optical Communication Band
Authors: Huang Min
Published: September 2012

his paper is concerned with the FR spectra analysis on the Bi, Tb and Yb partially substituted iron garnet crystals of Tb3-x-yYbyBixFe5O12. A specific FR (-1617o/cm at 1.55μm), a low FWC (0.009%/nm at 25oC) of Tb0.91Yb1.38Bi0.71Fe5O12 crystals grown from Bi2O3 self-fluxed melts can be used as broadband optical communication components. In order to interpret their FR spectra, a theory based on molecular-orbital levels of Fe3+ in tetrahedral and octahedral sites is used. It is shown that in the case of higher Bi3+ substitution, FR is mainly determined by the contribution of Fe3+ in the octahedral site. Furthermore, two types of rare-earth ions (Tb3+ and Yb3+) moderate the contribution to FR from Fe3+ in octahedral and decahedral sites and eventually have caused that Bi-substituted mixed rare-earth iron garnet has a near-zero Faraday rotation wavelength coefficient (FWC).
Research and Application of the Piezoelectric Ceramic Ultrasonic Transducer
Authors: Sun Bao Jiang , Meng Yan Qing
Published: September 2012

Ultrasonic transducer is produced by piezoelectric materials, and it can detect some characteristics of a target media by transmitting a certain frequency of ultrasonic signals and receiving the signal containing information of the media. The special properties of piezoelectric ceramic determine that the ultrasonic transducer will have a widely used. This paper mainly studies the characteristics of the piezoelectric ceramic, the parameters and equivalent circuit of the transducer performance, and the liquid concentration detection with the transducer.
New Method of WSN Node Localization Based on MSVD
Authors: Wang Lei , Cai Chen
Published: September 2012

Node localization technology is one of the important research areas in Wireless Sensor Networks (WSN) applications. The coordinates of the unknown nodes can be determined by the Least Square Estimate (LSE), which is commonly used in WSN node localization. But in the experiments and applications, it is discovered that different spatial positions sometimes lead to large errors. This phenomenon is studied and it is found that the WSN node localization is an ill-posed problem. It is proposed that WSN nodes localization should be diagnosed by the condition number. If the ill-posed problem degree is weak, the node can be localized by LSE method. But if the ill-posed degree is serious, the eigenvalue close to zero should be diagnosed and the node is localized by the method of Modified Singular Value Decomposition (MSVD) Regularization. Test results indicate that the proposed mothod of WSN localization based on MSVD weaken the influence of the ill-posed problems, reduces the location errors to around 3 meters, and improve the accuracy of localization.
A Comparative Study of Soldering Temperatures and Materials on the Reliability of Photovoltaic Modules
Authors: Lin Keh Moh , Lee Yang Hsien , Huang Wen Yeong , Hsu Po Chun , Huang Chin Yang , Hsieh Zhu Fu
Published: September 2012

To find out the important factors which decisively affect the soldering quality of photovoltaic modules, solar cells were soldered under different conditions (different temperatures, PbSn vs. SnAgCu solder, manual vs. semi-automatic). Experimental results show that the soldering quality of PbSn under 350°C in the semi-automatic soldering process was quite stable while the soldering quality of lead-free solder was generally unacceptable in the manual or semi-automatic process under different temperatures. This result indicates that the soldering process with lead-free solder still needs to be further improved. It was also found that most cracks were formed on the interface between the solder and the silver paste and then expanded outwards.
A Qualitative Approach to Camera Motion Classification
Authors: Lei Shao Shuai , Cao Chang Qing , Xie G.
Published: September 2012

This paper proposed a robust and hierarchical camera motion classification approach based on integrated histogram. First, a motion direction histogram is built, and the information entropy of histogram is employed to classify camera motion operations into scaling operation and non-scaling operation. And then, static and translation operations are distinguished by distribu- tion information of histogram, meanwhile the direction of translation operation is also identified. Experimental results show that the new approach can efficiently achieve global motion estimation.
The Errors Analysis of Flexure Rotation Joint of a Novel High Parallel Frequency Vibration Platform
Authors: Yang Qi Zhi , Zhuang Jia Qi , Zi Peng Fei , Zhu Xiao Bing
Published: September 2012

The flexure (compliant) joint has gradually replaced the rigid joint which is applied to the high-frequency device because of its structural advantages. As the most common type of error, the processing errors have a great impact on the performance of the flexure joints. It analyzed the width error and the other four processing error in the paper. Based on the detailed analysis of errors various structural parameters, it established a processing error model by using Paros J stiffness calculation formula and Smith S T error analysis method.
An Approach Based on Wavelet Transform to Remove the Noises of ECG
Authors: Liang Guo Zhuang , Sun Su Fang , Wei Jing Xia
Published: September 2012

In the acquisition process of ECG, noise, which mainly consists of power line interference baseline drift and the EMG interference, often exists due to the instrument, the human body and other aspects. This noise mixed with the ECG, will causes ECG distortion, which makes the whole ECG waveform blurred, and impacts the subsequent signal processing and analysis. In this paper, Coif4 wavelet is used to make the ECG decomposed by 8 scale; at the same time, the wavelet decomposition and reconstruction method is used to remove baseline drift, and then the improved wavelet threshold method is used to remove power line interference and the EMG interference waveform to obtain accurate geocentric, providing a more accurate basis for the medical diagnosis.
Effect of Supercritical Carbon Dioxide on the Mechanical Properties and the Morphology of PPO/POE Blends
Authors: Xin Chun Ling , Yan Bao Rui , He Ya Dong , Dong Fen
Published: September 2012

Blending PPO and POE-g-MAH assisted by SCCO2 has been investigated. The in-line rheological behavior of PPO and POE-g-MAH containing SCCO2 were studied with the slit die and self made in line rheological testing system. The effect of SCCO2 on the reduction of shear viscosity of PPO is more obvious than that of POE-g-MAH. The shear viscosity of PPO reduced 36.7% with addition 4wt% CO2. Morphology of blends was inspected by SEM. The sizes of POE-g-MAH disperse phase decreased with the contents of CO2 increasing. As a result, the impact strength of blend is improved from 43.5KJ/m2 to 100.9KJ/m2 due to introduce 4wt% SCCO2 for PPO/POE-g-MAH (85/15) blends.
Study on the Methods of Extract Key Tooth Code
Authors: Zhang Hai Feng , Zhang Xin Jie
Published: September 2012

With the rapid development of our society, the costs of the labor are rapidly increasing, and the workers do not want to do the same thing all day long ,and they need some automatic equipments that can help them do the bored and dangerous things, but there are no such automated assembly for locks in China. We urgent need an automated assembly equipment to meet the needs of the production. And key tooth coding is the necessary conditions for the realization of automated assembly, and the difficulty is the key tooth extract, in view of the above, and the paper innovatively proposes an extracting method of key tooth code on the basis of experiments.
The Study of Vehicle Stability Based on Fuzzy Control
Authors: Li Jun Wei , Jiang Hui
Published: September 2012

Vehicle reference model with two degree of freedom and multi-body vehicle dynamic model are set up at first. This paper presents a Fuzzy control strategy to deal with the nonlinear, time-varying characteristics of the system, which can control the feedback of yaw rate and side slip angle. The simulation results show that the Fuzzy control method can remarkably enhance the handling stability and safety of the vehicle in complex road and driving conditions.
Non-Fragile Robust H∞ Control for Linear Uncertain Switched Systems with Delayed Perturbations
Authors: Xu Ze Yin
Published: September 2012

The non-fragile robust H∞ controller was designed for a class of uncertain switched systems with delayed perturbations under additive perturbations of controller gain. A sufficient condition for the solvability of the non-fragile robust H∞ controller via state feedback was proved and presented, which based on a proper Lyapunov function and switching strategy, non-fragile robust H∞ controller can be obtained only by solving linear matrix inequalities. The systems under actions of the given controller are not only robust but also satisfy H∞ performance when controller changes, and thus have better adaptability against variety of the environment parameters. The simulation results show the effectiveness of the design method.
Optimization Design of Marine Waste Heat Recovery System Based on PSO-GA Algorithm
Authors: Ren Li , Li Hua Yan , Zhang Wen Xiao
Published: September 2012

Energy saving is the best way to energy exploitation and environment protection, especially in the case of the low carbon economy. In this paper, a hybrid approach combining particle swarm optimization (PSO) and genetic algorithms (GA) is developed for optimization design of marine waste heat recovery system. Based on exergy analysis method, the waste heat utilization degree of the marine waste heat recovery system is discussed. Considering the superheated steam temperature, evaporation temperature, economizer inlet temperature, water supply temperature and condensation temperature, a mathematical model is constructed in which the exergy efficiency of marine waste heat recovery system is taken as the objective function for optimization design of marine waste heat recovery system. The mutation operator of GA is introduced to the PSO to solve the mathematical model of marine waste heat recovery system for the diversity of particles. The effectiveness of the approach is illustrated by an optimization example.
Transformation Kinetics of α+γ2 to ß in Cu-Al Alloy after Cryogenic Treatment
Authors: Qi Mai Shun , Li Ya Li , Wu Lai Lei , Liu Jian Hua , Zhang Rui Jun
Published: September 2012

The transformation temperature and time of α+γ2 to ß in a Cu-Al alloy after cryogenic treatment during heating were measured by DSC, and the transformation activation energy of α+γ2 to ß was also calculated. It is indicated that the Cu-Al alloy with heating rate of 10°C/min, the phase transformation onset and ending temperature is 561.75°C and 582.88°C, respectively, and the phase transformation time is126.6S. The phase transformation activation energy decreases with the increasing volume fraction of their phase transformation.
Microstructure and Properties of Boronized Layer Produced by Borosulphurizing Method
Authors: Wang Dong , Li Hui Qin , Zhao Han Yu
Published: September 2012

In this study, 45 carbon steel was boronized and borosulphurized at 950°C for 2, 3， 4, 5, 6 and 8 h, respectively. The samples were characterized by scanning electron microscopy, optical microscope, microhardness tester and ring-on-block wear tester. It is found that the surface of borosulphurized samples was dense, compact and relatively smooth; Although the boride layers produced by boro- sulphurizing at 950°C showed a lower microhardness value compared with that produced by boronizing, the wear resistance of the borosulphurized carbon steel is higher than that of boronized sample due to formation of FeS phase in the boride layer.
A Parametric System for Perforating Parts Based on the Secondary Development of AutoCAD
Authors: Yan Rui , Ma Chun Yang , Xia Fa Feng
Published: September 2012

A parametric system for perforating parts is designed based on the secondary development of AutoCAD 2008. And the processing of the system is discussed in detail. The system is composed of database module, input module, parametric module and output module. If the user inputs appropriate parameters, this system can plot the exact drawing of YD-102 or YD-89 perforating parts in AutoCAD 2008.
The Study on Monitoring and Measuring System about the Blast Furnace Cooling Water’s Temperature Based on Wireless Network
Authors: Que Yao Hua , Li Shu Jun , Liu Yan Li , Yang You Song , Cui Da Fu , Zhang Xue Feng , Liu Xian Long , Jiang Jie
Published: September 2012

It is a new studied field that the monitoring and measuring system in blast furnace based on wireless network. A new technology about cooling water’s temperature monitoring based on wireless network in blast furnace is introduced, which contains technical composition and characteristics even the realization process. It is also shown that the practical process and results of the system is applied in the blast furnace of baotou iron and steel group.
Sliding Mode Control Scheme for Uncertain Linear Systems
Authors: Ding Gang , Liu Jin , Zhang Jing
Published: September 2012

A sliding mode control algorithm is proposed for a class of linear unmatched uncertain systems.The unmatched disturbance is will not be amplified by the discontinuous control. In order to reduce chattering, a bipolar sigmoid function without high frequency switching is induced. The control scheme developed is based on integral sliding mode and rate reaching law and stability is ensured using the Lyapunov method. An illustrative example shows the applicability of the method.
Control Algorithm of Interval-Valued Fuzzy Control
Authors: Zeng Wen Yi , Yin Qian
Published: September 2012

In this paper, we use the similarity measure of interval-valued fuzzy sets to investigate approximate reasoning of interval-valued fuzzy sets, propose the mathematical model of interval-valued fuzzy control, and investigate its control algorithm.
PSF Estimation and Image Restoration for Motion Blurred Images
Authors: Li Qi Shen , Chen Jian Gong
Published: September 2012

Point spread function (PSF) estimation and image restoration algorithm are the hotspots In the research of motion blurred image restoration. In order to improve the efficacy of image restoration, an improved algorithm named quadric transforms (QT) method is proposed in this paper by analyzing the restoration process of motion blurred images. Firstly, Fourier transform and homomorphism transform are applied to the original motion blurred image, and then the Fourier transform and homomorphism transform are used again to the obtained spectrum image. Secondly, the motion blur direction is estimated by Radon transform. Thirdly, the motion blur length is found by differential autocorrelation operations. Finally, utilizing the estimated blur direction and blur length, the motion blurred image is restored by Wiener filtering. Experimental results show that the proposed QT method can get more accurate estimated motion blur angles than the primary transform (PT, that is, Fourier transform and homomorphism transform are used one time) method and can get better restored images under the meaning of peak signal to noise ratio (PSNR).
The Research Based on Fast Motion Estimation of H.264
Authors: Che Sheng Bing , Gao Han
Published: September 2012

A optimization algorithm is put forward based on the brightness and frequency domain characteristics of macro block, including the algorithm of model segmentation and the prediction algorithm of starting motion vectors(MV). The basic idea of the mode segmentation is that to the unit of 16×16 block, discrete wavelet transform to frames, the after low frequency coefficients as the research object, define the coefficients sum ∑. If ∑ is greater or equal to threshold, the corresponding areas will be divided into texture areas, or smooth areas. The current block is compared with the corresponding block in reference frames. If the result is equal, the current block will be marked to background block, or sport block, and the corresponding segmentation mode is selected at the same time. The basic idea of prediction starting motion vectors algorithm is that base on the marked sport blocks, the starting MV of current block is the median value of MV to adjacent sport blocks in initial MV prediction. The experimental results show that the efficiency of algorithm in this paper has been improved.
Effect of Transition Metal Ion Doping on the Photocatalytic Activities of TiO2 Synthesized by Sol-Gel Method
Authors: Zhong Min , Yu Jing Jing , Wei Zhi Hao , Si Ping Zhan
Published: September 2012

Pure TiO2 , Ti 0.75 Fe0.25 O2, Ti0.75 Ni0.25 O2, Ti0.75 Co0.25 O2 nanocrystals were prepared by low temperature sol-gel method. The samples were characterized by using transmission electron microscope, X-ray diffractometer and ultraviolet-visible spectrophotometer to study the effect of transition metal ions on the photocatalytic properties of TiO2 nanocrystals. The results show that the pure TiO2 and Ti0.75 Fe0.25 O2, Ti0.75 Ni0.25 O2, Ti0.75 Co0.25 O2 nanocrystals were granular and the size of which is 3.5, 2.9, 3.6, 3.9 nm, respectively. The titania anatase phases appear in the pure TiO2 , the Ti0.75 Fe0.25 O2, Ti0.75 Ni0.25 O2, Ti0.75 Co0.25 O2. The absorption edge of Ti0.75 Fe0.25 O2occur red shift comparing with that of pure TiO2 and the absorption edge of Ti0.75 Fe0.25 O2and Ti0.75 Fe0.25 O2occur blue shift comparing with that of pure TiO2. The photocatalytic properties of pure TiO2, Ti0.75 Fe0.25 O2, Ti0.75 Fe0.25 O2, Ti0.75 Fe0.25 O2nanocrystals synthesized at low temperature by sol-gel method were investigated by degrading the methyl orange solution under ultraviolet irradiation. The degradation rate of Ti0.75 Fe0.25 O2is the highest (60%) and that of Ti0.75Co0.25O2 (10%) is the lowest among these catalysts after degradation for 120min.The result shows that the photocatalytic property ofTi0.75 Fe0.25 O2nanocrystals synthesized at low temperature is obviously better than that of pure TiO2 and Ti0.75 Fe0.25 O2, Ti0.75 Fe0.25 O2.
Grain Refinement of Zn-25Al Alloy through the Addition of Zn-6Ti Master Alloy
Authors: Wang Zhen Qing , Zuo X.H. , Yang Z.X. , Geng H.R.
Published: September 2012

In this paper, Zn-6Ti master alloy was produced and characterized by XRD and SEM. It was found that α-Al dendritic grains in Zn-25Al alloy were remarkably refined after the addition of Zn-6Ti master alloy, with the size remarkably reduced and the morphology changed from complex dendrite to rose-like or granular (equiaxed particle) structure. Lower solidification temperature of the Zn-Al melt was found to further promote the formation of granular (equiaxed particle) α-Al grain in Zn-25Al alloy with the addition of Zn-6Ti master alloy. The mechanism for the grain refinement is discussed based on the SEM observation of TiAl3-xZnxparticles at the center of α-Al grain in Zn-25Al alloy.
Experimental on the Residual Life of Oil Tubing of J55 Material
Authors: Li Jie , Yao Dong , Xu Peng Yi , Fan Jian Chun , Cui Li Shan
Published: September 2012

Oil tubing works as a special pipeline in oil well has the characteristic of high work efficiency and under high loading. Oil tubing failure which commonly happens during the course of oilfield development and production can bring severe economic loss because of the failure accidents caused by the eccentric friction of rods and tubing account for a great percentage. It has a great of significance to study on the fatigue fracture situation and the critical eccentric friction depth of tubing with defects. Oil tubings of J55 material with the specification of Ф73*5.51 commonly used in oilfields were chosen to be the source of semi-ellipse surface crack tensile specimens. Residual life of oil tubing with different eccentric friction percentages was studied through tensile tests. The critical eccentric friction percentage under which the residual life of oil tubing can meet pump detection period was determined, which provides reference for making a reasonable failure standard of tubing. From the tensile test results of the oil tubings of J55 material simulating the condition that the eccentric friction depth accounts for 30% ~ 50% of the wall thickness, the critical friction depth of oil tubing of J55 material is 43.0% of the wall thickness.
Study on Tribological Properties of ZrO2 Ceramic Coating with APS
Authors: Zhao Min , Qi Zhen Nan , Zhang Jing , Gu Yan Li
Published: September 2012

TheY2O3 partially stabilized in ZrO2 and the MgO partially stabilized in ZrO2 ceramic coating were sprayed by APS on 45 steel substrate, and the tribological properties of coatings were tested on the MMW-1 vertical universal friction and wear tester at room temperature and dry sliding conditions. With FA2004 electronic balance, the amount of the loss of coating is measured. The wear of the coating surface morphology is observed by scanning electron microscopy. The test results show that wear resistance of Y-PSZ coating is better than Mg-PSZ coating. There are some cracks, voids and peeling pits in two kinds of coating. A material transfer is occurred during the friction and wear.
Preparation of Rigid Polyurethane Foam and Research Progress of its Reinforced Technology by Inorganic Materials
Authors: Cheng Ming Ming , Wang Fei , Ma Lin Jing , Fan Chao
Published: September 2012

Rigid polyurethane foam has many advantages such as low thermal conductivity, good thermal insulation, good antisepsis ability, non-toxic, and light quality. Based on the above reasons, this paper systematically summarized the processing technologies of rigid polyurethane foam, and research progress of its reinforced technology by inorganic materials was briefly discussed.
Baseline Method for Determining the Solid Fraction
Authors: Xu Jun Feng , Liu Feng
Published: September 2012

A baseline method to determine directly the solid fraction using the cooling curve was proposed for solidification of undercooled melts. To construct the baselines, a sudden function ξα(x) is introduced. In terms of present method, the solid fractions during solidification of Zr metal and Al-7wt.%Si alloy were predicted. The predictions coincide with the results of the available methods.
Hard Thermosetting Polyurethane Plastic Degradable Test and its Influential Factors
Authors: Liu Zhi Feng , Zhao Jian , Xia Hui , Wu Zhong Wei
Published: September 2012

Through the combined mechanical forces of sheer, friction and squeezing, the rigid polyurethane powder particles get certain plasticity. Based on the principles of mechanical and physical methods, an orthogonal test is designed, and then characterization analysis under conditions of different parameters is carried out through ATR-FTIR. The test indicates that when the rotate speed is 2400r/min, test time is 120min and inlet amount is 24g, the carbamic acid ester groups break down at the place of C-O bond and the cross-linked network structure is destroyed, then the best degradation effect is gained. This article provides theoretical basis for the recycle of thermosetting plastic.
The Microstructures and Mechanical Properties of a Novel Biomaterial Mg-Zn-Sr Alloy Sheet during Aging Treatment
Authors: Cui Tong , Guan Ren Guo , Qin Hai Ming
Published: September 2012

Mg-Zn-Sr alloy sheet; biomaterial; aging treatment; tensile property Abstract. The microstructures and mechanical properties of a novel biodegradable Mg-Zn-Sr alloy sheet aged at 175°C had been studied. The results indicate that the grain size of the casting alloy Mg-Zn-Sr is changed with the change of content of element Sr, and while it is 1.0 (wt.)%, smaller average grain size is gained which is 38μm, as well as it is increased to 1.5 (wt.)%, the grain size is coarsen obviously. The phase precipitated in the alloy sheet is sufficient and distributed in the uniform style at 175°C for 8h which gained the preferable mechanical properties, which the tensile strength reaches 230MPa, hardness 76.1HV as well as prolongation ratio 12.7%.
The Influence of the Hydrothermal Conditions on the Morphologies of β-Ni(OH)2
Authors: Fu Xiao Ming
Published: September 2012

Flower-like β-Ni(OH)2 and nanoflakes have been successfully synthesized with nickel nitrate as nickel source and stronger ammonia water as precipitant via the hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by XRD (X-ray diffraction) and SEM (Scanning electron microscope), respectively. XRD shows that the phase of the samples is β-Ni(OH)2. SEM confirms that The low reaction temperature is propitious to the synthesis of flower-like β-Ni(OH)2, and with the increase of the reaction time the nanoflakes of flower-like β-Ni(OH)2 become much thinner. However, The high temperature is in favor of the synthesis of β-Ni(OH)2 nanosflakes, and with the further increase of the reaction temperature.
Low Speed Diesel Engine Block Finite Element Analysis
Authors: Liu Zhong Min , Yan Han
Published: September 2012

In the analysis of the low speed diesel engine under bolts pre-tightening force, maximum explosion pressure, and piston group of reciprocating inertia force condition, the block main bearing hole values of stress and deformation, for the Mechanical stress analysis of the low speed diesel engine block. First, in the Hypermesh, use the hexahedral mesh near the main bearing hole, use the tetrahedral mesh in other parts. By setting up the grid unit density, control the mesh quality, densify the grid of key parts. And then calculated the stress and deformation of the block by use Abaqus. According the engine performance test data to set the boundary conditions. In the calculation of stress field, analyze the stress distribution and deformation of block under the bolt pre-tightening force, explosion pressure and reciprocating inertia force condition.
Error Effects on Identifying Coupling Dynamic Stiffness of a Mechanical Assembly by Indirect Inverse Substructuring Dynamic Analysis
Authors: Lu Guang Qing , Wang Lei , Dong Kui , Lu Xin Guang , Li Xian Neng
Published: September 2012

Indirect inverse substructuring dynamic analysis has been developed recently by the author of this paper and provides a new simple approach to identify the coupling dynamic stiffness of mechanical assemblies. To analyze the error effects of measuring frequency response fuctions (FRFs) on the identification, this study implements a set of parametric studies on basis of a lamped mass model to deal with parametric studies which result in some guidance for applications of the approach.
Modeling and Simulation of a Novel Drive Joint Based on Permanent Magnet and Electromagnet
Authors: Liu Lan Tao , Yang Bin Tang , Wang Qi , Meng Guang
Published: September 2012

A novel drive joint based on the principle of interaction between electromagnet and permanent magnet is introduced, which may be used in active vibration control. The toque model and the dynamic model of the system are built. The toque model is verified by the results of Finite Element Analysis (FEA). Finally, the dynamic simulation based on the model is carried out.
Leakage Analysis of a Synchronal Rotary Multiphase Pump
Authors: Yang Xu , Qu Zong Chang , Wu Yu Yuan
Published: September 2012

A novel positive-displacement multiphase pump named synchronal rotary multiphase pump (SRMP) was introduced. The two-phase leakage flows through the various leakage clearances in the SRMP were theoretically analyzed and formulated. Calculations on the leakage loss of a SRMP prototype were performed. The results show that the leakage loss is mainly produced by the leakage through the radical clearance between the rotor and cylinder. The SRMP presents a lower volumetric efficiency at a higher pressure difference. The leakage loss increases rapidly with the increase of the gas volume fraction of the two-phase working fluids.
An Electrochromic Copolymer Based on Pyrrole and 3,4-Ethylenedioxythiophene Electrodeposited in Aqueous Micellar Solution
Authors: Tao Yi Jie , Zhang Zhao Yang , Cheng Hai Feng , Zheng Wen Wei
Published: September 2012

An electrochromic copolymer based on pyrrole and 3,4-ethylenedioxythiophene (EDOT) are electrodeposited on ITO electrode in aqueous micellar solution. The copolymer show blue grey in neutral state (-0.8V) and light blue in oxidized state(0.8V). The λmax of the copolymer in neutral state is 530nm and the onset energy for π-π* transition (Eg) is calculated to be 1.68eV by the onset wavelength. And successive cycle voltammagrams indicate that the incorporation of EDOT units into the Ppy improves the electrochemical stability of the copolymer films, which retains 89% of electroactivity after 500 cycles, the copolymer could be as a promising candidate material for electrochromic devices.
Orthogonal Experiment Design and Analysis on ABS Power in SLS
Authors: Chen Qing Guo , Ni Su Huan
Published: September 2012

Based on mechanism of SLS, the scanning speed, laser power, preheat temperature and thickness of spreading layer are main factors to part quality in Selective Laser Sintering(SLS). With manufactured specimen pieces by Molding machine AFS-450, orthogonal experimental design and analysis of variance were adopted to post-treatment. Three indexes, including sintering strength, constriction percentage and sintering density, were studied. So an optimized project can be determined. This work can provide process parameters in SLS for ABS power. It will be of benefit to improve the part dimensional precision and strength.
Research on Numerical Algorithm of Constitutive Equation under High Speed Deformation in Hadfield Steel
Authors: Sun Deng Yue , Li Jing , Zhang Fu Cheng , Liu Feng Chao , Zhang Ming
Published: September 2012

The influence of the strain rate on the plastic deformation of the metals was significant during the high strain rate of loading. However, it was very difficult to obtain high strain rate data (≥ 104 s-1) by experimental techniques. Therefore, the finite element method and iterative method were employed in this study. Numerical simulation was used to characterise the deformation behavior of Hadfield steel during explosion treatment. Base on experimental data, a modified Johnson-Cook equation for Hadfield steel under various strain rate was fitted. The development of two field variables was quantified during explosion hardening: equivalent stress and strain rates.
Analysis and Design of Low-Speed Bar Linkage
Authors: He Yu Peng , Zhao Xiang Xiong , Yuan Zhi Hua
Published: September 2012

A class of problems is usually met in actual engineering, i.e., the low-speed motion of the slider of a linkage in a section of its stroke is required based on the prerequisite of ensuring the slider’s definitive working times. Through analyzing the mechanisms of low-speed Stephenson’s six-bar linkage, the main parameters of the slider’s low motion are found. The Stephenson’s six-bar linkage satisfying low-speed working requirements is designed through a mechanical press as an example.
Application of Topological Optimization on Aluminum Alloy Automobile Wheel Designing
Authors: Zhang Zhi Jun , Jia Hong Lei , Sun Ji Yu , Wang Ming Ming
Published: September 2012

Topology optimization method based on variable density and the minimum compliance objective function was used on designing the wheel spokes. SIMP material interpolation model was established to compensate these deficiencies of variable density method. Considering manufacturing process and stress distribution, five bolt wheels was chose to topology optimization. The percentage of material removal of the optimal topology 40% was reasonable. Finite element analysis was used to test the strength and stiffness of the structure of the wheel, the result meets the requirements after wheel topology optimization, and reduces the quality of wheels to 7.76kg, achieve the goals of lightweight design.
PLC-Based Automatic Plating Line Design
Authors: Lin Jian
Published: September 2012

In the vehicle engine's part, piston ring is a important part, which working environment is hard. It’s surface need to be enhanced so that to gain highly wear resistance and anti-corrosion properties. But in the piston ring manufacturing process, how to improve the working environment is a real urgent problem. This article present a design for SCADA(Supervisory Control and Data Acquisition) system using for automatic electroplating line, which use industrial PC , PLC and other components, connected by industrial network. Some detail technology are introduced.
Corrosion of Biodegradable Implant Mg-2Ca-xZn Alloy in Simulated Body Fluid with the Addition of Zn
Authors: Wang Ji Jie , Feng Yue Jiao , Cui Tong , Jiang Da , Li Na , Liu Chun Zhong
Published: September 2012

The affect of adding of Zn on the microstructure and corrosion properties was investigated in this work. Vacuum induce melting was used to obtain the Mg-2Ca-xZn (wt.%) (x = 0%, 1%, 2% and 3%) alloys. Erode test was carried out in the Hank’s simulated body fluid for the alloys and the increasing of weight is carefully measured. The microstructure of the alloys was observed with optical microscope and SEM. It is found that and the Mg-2Ca-1Zn alloy is with the best corrosion resistance. Hardness increases as the adding of Zn in the alloys.
Tapered Work Roll Shape Design and Optimization for Cold Tandem Rolling Mill
Authors: Zhou Xiao Min , Mao Yang Jun , Wu Yun Feng
Published: September 2012

K-WRS technology has a better edge drop control effect in cold tandem rolling mill, but it still exists some problems such as contact pressure peak beyond the limit, transition peak and the uneven distribution of contact pressure between the rolls in practical application. In this paper, tapered work roll shape is designed and optimized. The simulation analysis shows that the optimized roll shape not only can effectively control the edge drop of strip，but also can improve the contact pressure between the rolls. At the same time, it also can reduce the influence on the flatness control from the edge drop control.
Study on the Numerical Control System for Frame Cold-Bending Machine
Authors: Zhou Yong Qing , Wang Cheng Fang , Mao Yun Sheng , Hu Yong , Lee Pei Yong
Published: September 2012

Shape processing of frame is one of the important and trouble working procedures for shipyards, and its robotized research has been carried on until it is gradually put into use in recent years. This paper introduces a CNC frame cold-bending machine, including the components of its machine, the principle of its NC control, the hardware and software of its NC control system.
Effect of the ZnO Buffer Layer Thickness on AZO Film Properties
Authors: Sui Cheng Hua , Liu Bin , Xu Tian Ning , Yan Bo , Wei Gao Yao
Published: September 2012

To evaluate the influence of the ZnO buffer layer thickness on structural, electrical and optical properties of ZnO: Al (AZO)/ZnO bi-layer films, a series of AZO/ZnO films were deposited on the quartz substrates by electron beam evaporation. X-ray diffraction measurement shows that the crystal quality of the films is improved with the increase of the film thickness. The electrical properties results show that the resistivity decreases initial and then increases. However, optical transmittance of all the films is >80% regardless of the buffer layer thickness in the visible region. The results illustrate that the insertion of ZnO buffer layer can improve the film performance.
Research on the Influence of Unsprung Mass on Vehicle Handling Stability
Authors: Liu Ming Chun , Zhang Chen Ning , Wang Zhi Fu
Published: September 2012

A dynamical model of engine vehicle was built by using ADAMS/Car. Based on that, another dynamical model of four-independent-wheel-drive electric vehicle was built too. Two simulation experiments of steering wheel angle step input and steering wheel angle impulse input were done. Considering the vehicle mathematical model with two linear degrees of freedom, the transient response and frequency response characteristics were evaluated. Simulation results indicated that time-domain and frequency-domain characteristics of four-independent-wheel-drive electric vehicle were influenced because of its heavy unsprung mass, and that leaded to the deteriorative handling stability.
Experiment and Numerical Simulation of Frictional Resistance in Vertical Helically Coiled Pipe
Authors: Zheng Shui Hua , Zhu Bo , Mou Jie Gang , Li Jia
Published: September 2012

The frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe was investigated by means of experiment and numerical simulation. The resistance data in the conditions of different gas-liquid ratio was obtained. A numerical simulation platform was developed based on the heat and mass transfer theory and characteristics of the FLUENT software. Comparing and analyzing the results of experiment and simulation, it indicates that there is good computational accuracy of the numerical simulation platform, and the platform can provide a good support for the design and research of vertical helically coiled pipe.