bluuebunny/crossref_metadata_2025 huggingface dataset:
An Automatic Singing Evaluation System
Authors: Liu Yu Xiang , Jin Ze Yu , Jia Jia , Cai Lian Hong
Published: October 2011

In this paper, a singing evaluation approach based on pitch and rhythm accuracy is proposed. A comparative study was first carried out between speech and singing voice, which demonstrated the characteristic of consonant and vowel in singing voice. A phoneme boundary detector was adopted to perform note segmentation in a high time resolution by using characteristics of consonant and vowel. As for singing skill evaluation, relative pitch interval between reference score and actual sung pitch was adopted to estimate pitch deviation while difference between absolute position and expected position of beats served as rhythm consistency measure. Experiments on a solfege corpus demonstrated a noticeable improvement in the performance of onset detection. A detailed subjective evaluation showed great consistency between the proposed evaluation approach and experts’ judgment.
Effect of Image Motion and Vibration on Image Quality of TDICCD Camera
Authors: Wang Zhi Le , Zhuang Xu Xia , Zhang Lan Qing
Published: October 2011

Image motion and vibration are significant factors influencing image quality of satellite-based TDI camera. In order to learn their effect on TDICCD, motion degradation models at two directions were established. Based on the models, Line spread functions (LSF) for image motion of different types and strict expressions of MTF for abnormal linear image motion were deduced. Modulation transfer function (MTF) for sinusoidal image vibration was calculated through numerical integration. Geometric distortion was evaluated by linear part of phase transfer function (PTF). The results indicate that abnormal linear motion and high frequency vibration cause space-invariant image blur while low frequency vibration brings space-variant image blur and geometric distortion.
Image Displacement Detection under Low Illumination Using Joint Transform Correlator with Wavelet Denoising
Authors: Li Qi , Ge Peng , Feng Hua Jun , Xu Zhi Hai
Published: October 2011

Since joint transform correlator (JTC) cannot directly detect the displacement between reference and target images without adequate exposure, an image displacement detection method using JTC based on log-Gabor wavelet denoising is proposed. The method uses a log-Gabor wavelet transform to denoise the reference and the target image obtained in the condition lack of enough exposure, preserving the phase information of them. Results show that the method can successfully accomplish the motion detection, RMSE of displacement measurement using JTC with wavelet denoising could be within 0.3 pixels under 1/80 of normal exposure. The method improved the detection ability of JTC in the condition of low illumination and low contrast, and has great application prospect under these circumstances.
Measurement of Tracking Accuracy of Antenna Using Precise Geostationary Satellite Orbit
Authors: Wang Ye Jun , Zheng Ai Wu , Fu Yong Qiang , Liu Yong Qing
Published: October 2011

The conventional method to measure the tracking accuracy of antenna is based on the boresight tower. But the accuracy of this method is not very high because the result is easy to be disturbed by reflecting electromagnetic wave from ground, surrounding buildings and terrains under low elevation in measuring. And a boresight tower and a lot of corresponding equipments are needed in this method. It costs both time and money. This paper presents a new method of using precise geostationary satellite orbit to measure the tracking accuracy. It is easy to operate. Moreover, the accuracy of this method is higher than the conventional one. The feasibility of the new method is validated in comparison with the conventional one, so it can be used in the construction and maintenance of ground stations.
Neighbor-Based Adaptive Listening and Sleeping Scheme for Wireless Mesh Sensor Networks
Authors: Fan Jing , Hao Jun Feng , Li Jie , Xie Jian Bin
Published: October 2011

According to the topology of Wireless Mesh Sensor Networks (abbreviate to WMSN), and the channel access strategy of alternately listening/sleeping scheme, this paper study a neighbor-based adaptive listening/sleeping mechanism for WMSN. Based on the theory of queuing, the paper designed an algorithm named neighbor-based listening and sleeping algorithm (abbreviate to NLS) which can adaptively arrange the duty cycle of transmission frame. On the account of three typical topology for WMSN and consider the neighbor number of Mesh routers and sensor nodes, the performance of proposed scheme are simulated and studied under NS-2. The study results show that the combination of the WSN and WMN can be constructed to achieve full interconnection of heterogeneous mesh topology network. Application of queuing theory to establish the WMSN network multi-hop data transmission model can dynamically adjust listening time of different nodes. Using NLS algorithm, the throughput, delay and energy-efficiency of WMSN network are all improved to some extent.
Node Deployment of Wireless Sensor Networks in Long Narrow Area
Authors: Sun Xu Guang , He Jing Sha , Yang Ming Xin , Sun Xiao Ling
Published: October 2011

In this paper, we study the node deployment in long narrow area of wireless sensor networks. Currently, studies on node deployment of wireless sensor networks mostly concentrated in two-dimensional flat area and three-dimensional space area which are complicated or inapplicable for long narrow area. The significant difference of node deployment between long narrow area and two-dimensional area is that the nodes in two-dimensional monitored area can be deployed anywhere, while the nodes in long narrow area can only be deployed by side with the environmental constraints. Considering the coverage, connectivity and reliability, we give out the densities and numbers of needed nodes in node deployment scheme for both 1-connected cover and k-connected cover in long narrow area covered completely by sensor networks.
An Improved DV-Hop Algorithm Based on Entropy for WSN
Authors: Chen Jing , Liu Xiao Ping
Published: October 2011

Localization is one of the key technologies in wireless sensor networks. In this paper, the improved algorithm is derived from DV-Hop algorithm, and uses entropy weight to improve localization accuracy without needing an additional hardware device. Simulation results show that the improved DV-Hop algorithm can provide more accurate location estimation than the DV-Hop algorithm.
PZT Sensors and their Application in Structural Health Monitoring
Authors: Sun Xuan
Published: October 2011

This paper provides the state of the art in methods to detect damage in structural and mechanical systems by PZT sensors, which include impedance methods and lamb wave propagations. The basic idea behind these technologies is to use impedance of PZT embedded on surface or lamb wave propagations. A brief overview of research work on experimental and theoretical studies on various structures and mechanical systems is descried. Past, current and applications of this technology in actual engineering systems are summarized. Finally, desirable developments for further advancement of this field are discussed.
Research of Active Detection Technology Using Vector Array on Small Platform
Authors: Sheng Xue Li , Lu Jia , Sun Chun Yan , Mei Ji Dan , Guo Long Xiang , Yin Jing Wei
Published: October 2011

Active sonar on small platform which uses vector array is selected in this paper as research object, the methods of signal and DOA estimation and the performance of these methods are discussed. Vector array comprehensive copy correlator and vector array comprehensive adaptive copy correlator which use acoustic pressure and vibration velocity at the same time are proposed in this paper. The performance of signal processing and the precision of DOA estimation can be improved by these methods. Simulation results present that the performance of the proposed methods are better than conventional copy correlator. In addition, vector array comprehensive adaptive copy correlator has higher gain than vector array comprehensive copy correlator in multi-path channel.
Research of DC Current Measurement Technology Based on Optical Fiber Thermometry
Authors: Jia Dan Ping , Wang Yang , Lin Song , Wei Quan Kang
Published: October 2011

Thin film sensor has the advantages of small size and low cost, which has become a research hotspot in recent years. A measurement system of passive optical fiber DC current sensor based on the thin film sensors is designed in this article. Designs of electric-heating converter, heating-light converter and low-voltage measurement display system are introduced in detail. Experimental results indicate that the general linear correlation between the time constant of fluorescent lifetime and the voltage across the thin film resistor. The feasibility of measurement system is verified via the results of the experiment.
Research on High Precision and Non-Contact Measuring System for Geometric Parameter of the Irregular Shape
Authors: Cheng Yu Hua , Bai Li Bing , Nie Lin
Published: October 2011

Traditional measurement for geometric parameter of the irregular shape is considered as high cost and low efficiency, and large-scale automatic measurement cannot be achieved. In this paper, a low-cost, high-precision measurement system of irregular shape is presented. The system based on linear array CCD non-contact measurement method, in which a CCD camera is controlled to scan the projection of thread in the parallel optical field to acquire thread images. Meanwhile, an edge detection method based on gradient operator and linear fitting principle is proposed, the results show that the design improve the measurement precision efficiently.
A BP Decoding Algorithm Based on Nodes Residual for LDPC Codes and its Hardware Implementation
Authors: Wang Zhong Xun , Wang Xing Cheng , Zhu Fang Qiang
Published: October 2011

We researched BP decoding algorithm based on variable-to-check information residual for LDPC code (VC-RBP) in this paper. It is a dynamic scheduling belief propagation using residuals, and has some advantages，such as fast decoding, good performance, and low complexity. It is similar to residual belief propagation (RBP),but has some difference in computing the residual message. This paper further optimized the new algorithm on DSP of TMS320dm6446, and it is good for hardware implementation.
Based on Fuzzy PID Control’s Research of Control of Concentration of Sub-Nanometer Wood Flour
Authors: Guo De Zhi , Yang Chun Mei , Ma Yan , Liu Yu Juan
Published: October 2011

In this paper, the concentration of sub-nanometer control of wood flour based on fuzzy PID control, how to increased the concentration of the targetd wood flour is Proposed. Obtained by analyzing, the traditional PID control can not solve the problem of wood flour concentration detection accuracy, to proposed fuzzy PID control method can improve the accuracy of wood flour concentration detection and the performance system stability. To establishment the matlab simulation, illustrates the fuzzy PID control system is more advantageous than the traditional PID control system, reducing the overshoot of system effectively, improving the response of system, shortening the adjustment time, strengthening the dynamic performance of the control system.
Distributed High-Precision Field Testing System of Construction Machinery Based on CAN Bus
Authors: Yang Xiao Qiang , Gao Ya Ming , Wang Xiao Long , Han Jun
Published: October 2011

The main objective of this work is development of a type of status parameter testing system based on CAN bus for construction machinery. Various difficulties due to over-abundant parameters of testing and controlling, many different types of transducer, changes and anomalies in the operation temperature and harsh EMI environment are considered in the accomplishment. The design of intelligent field testing node is demonstrated in detail. The intelligent node consists of embedded microcontroller AT89C52, high-precision signal conditioning circuits, CAN interface module and other peripheral circuits. The intelligent node uses software auto-zero correction and full-scale correction as well as the method of second-degree parabola interpolation to deal with the non-linear characteristic of the measured data. Hence, it implements the high-precision detection and measurement. In addition, the intelligent connects to the host computer via CAN bus to form a distributed high-precision status parameters testing system. The hardware circuit of operation status parameters measurement and communication interface circuit are developed and described, and the software is also accomplished with C language and LabVIEW. The system has the advantages of simple structure, reliable performance, significant capability of real time processing, powerful anti-jamming performance and so forth. Meanwhile, the system has great application prospect.
Error Analysis of Mechanism with Clearances and Fuzzy Control
Authors: Huang Kun Rong
Published: October 2011

The mechanism with clearance is a nonlinear system, then using classical control theory and modern control theory cannot obtain satisfactory control effect. Therefore，In order to control the nonlinear error cause by clearance, the conventional fuzzy control and parameter self-regulation fuzzy control are considered by using the fuzzy control’s humanization and intelligent. The results of test show that: the nonlinear error got smaller and the stability of system got obvious improvement as the introduction of intelligent control system.
Failure Modes and Countermeasures of Working Device of a Heavy Vehicle
Authors: Zhou Hao , Jiang Ren Yan , Peng Jing Song
Published: October 2011

A heavy special vehicle is used in a steel mill. The failure and repair records of the vehicle are available. The study aims to identify main failure modes and areas needing improvement in the working device of the vehicle. The reliability bottlenecks are identified through analyzing the repair reports and the countermeasures for reliability improvement are suggested based on the analysis results. The approach presented in this paper is useful for periodically reviewing and continuously improving the reliability of complex repairable systems.
Flipping PTS-OFDM System without Side Information
Authors: Li Ya Zhen , Guan Jing , Huang Li Qun , Zhang Jie
Published: October 2011

In this letter, we propose a novel scheme to reduce the PAPR of OFDM signals. It combined the channel estimation in OFDM system based on comb-type pilots and Flipping PTS algorithm. At the sender we insert comb pilot independently and evenly into every partitioned sub-blocks after partition. The side information of Flipping PTS algorithm as one part of the channel frequency response is transmitted. We can achieve Flipping PTS algorithm without SI. Simulation results show that performance of the new algorithm without SI is worse than the algorithm with SI. However, it reduced PAPR, increased of the data rate.
Pinning Synchronization of Complex Dynamical Networks with Time Delay
Authors: Zhang Jie , Liu Bo , Zhao Zhi Min , Li Qiong Xiang
Published: October 2011

In this paper, pinning synchronization of complex dynamical with time delay was considered. We proved that the dynamical complex network can achieve synchronization with small time delay. Then we give some simulations to illustrate the theoretical result.
Controlling Chaos in Permanent Magnet Synchronous Motors by Cascade Adaptive Approach
Authors: Wei Wei , Zuo Min , Jiang Tong Qiang , Liu Zai Wen
Published: October 2011

Chaotic phenomena in permanent magnet synchronous motors (PMSM) can be observed when parameters in PMSM are in a certain range. In general, chaos will degrade the performance of PMSM or even collapse the system. In order to suppress the chaos in PMSM, cascade adaptive control is utilized in this paper. Faithful model of PMSM is not necessarily required by using adaptive control based on dynamic compensation mechanism. By choosing appropriate controller parameters, chaos will be eliminated and the response speed can be tunable. Numerical simulation results for nominal case and parameter perturbation case are given out to confirm the cascade adaptive control is valid in chaos control of PMSM.
Effect of Pore Size on the Hydrophilicity in Dark of TiO2 Films
Authors: Wang Qi , Lin Cheng Pu , Cui Peng
Published: October 2011

Mesoporous TiO2 films was prepared by evaporation-induced self-assembly and dip-coating method. And the pore size of the TiO2 films is adjusted by controlling the molar ratio of H2O/TiO2 (H value). Water contact angle was chosen to represent the hydrophilic property, and XRD and AFM were carried out to characterize the films. With the increase of H value, the pore size increased firstly then decreased. And when H is 15, the pore size is the biggest, which hydrophilicity in dark is the best too. With the extention of the non-irridation time, the hydrophilicity is worse. And the reason may be ascribed to the adsorption of organic matter in air.
Fatigue Property of Welded Joints of Ti6Al4V Titanium Alloy in Corrosion Environment
Authors: Bao Jun Cheng , Zhao Jie , Li Jian Ping
Published: October 2011

The fatigue property of welded specimen of different form of Ti6Al4V Titanium Alloy plate was researched in the environmental condition of atmosphere and salt fog,The test results indicate the holes along weld seam in welding specimen have great influence on fatigue property, The fatigue life of Ti6Al4V Titanium Alloy doesn’t low under the salt fog condition in high stress range. The salt fog brings about the influence on fatigue life obviously at the same corrosion condition with fatigue stress lowering.
Oxidation Chlorination of Thiophene in Coking Benzene
Authors: Ling Min Yan , Chen Hou He
Published: October 2011

Thiophene is a typical thiophenenic sulfur compound that exists in coking benzene. In this paper, investigate oxidation chlorination of thiophene in coking benzene. Potassium permanganate was combined with hydrochloric acid for a new KMnO4/HCl system of oxidation desulfurization. The preliminary results show that the thiophene in the benzene cannot be deep oxidized desulfurization alone potassium permanganate solution even at acetum. The thiophene in the coking benzene could be mostly converted by using KMnO4/HCl system. In suitable reaction conditions thiophene’s removal rate can reach more than 93%.
Research on Hysteretic Phenomenon of Metal Rubber
Authors: Hao Hui Rong , Bai Hong Bai , Li Dong Wei
Published: October 2011

Metal Rubber is a kind of material with nonlinear of resuming force. In the dynamic test of Metal Rubber based on the control of displacement loading, its force-displacement curve is a hysteretic loop. The hysteretic phenomenon is studied with the means theory and experiment in this paper. The generalized restoring force is the binary function of displacement and speed. For the binary function, it is unilateral to represent the hysteretic loop only on the displacement-force plane, so the space hysteretic loop is introduced. The important parameters of the linear vibration isolators are stiffness and damping coefficient, however the nonlinear vibration isolators have stiffness and damping function, which all need be identified from the tested data. The results have proved that the dynamic model can meet the requirements of dynamic analysis of Metal Rubber in engineering.
Comprehensive Sewage-Treating Technology Using Bio-Tank of Glass Fiber Reinforced Plastics on Intensive Scaled Swine Farm
Authors: Xu Qing Xian , Guan Xue Fang , Lin Bin
Published: October 2011

The scaled swine farms have been developed rapidly in China since 21stcentury, which bring serious problem in environmental pollution, especially in winter. In order to s reduce the pollution from intensive scaled swine farms, as well as produce biogas in winter, a technological route was put forward to control the sewage pollution in swine farm by using bio-tank of glass fiber reinforced plastics (GFRP). The experiments in swine farm of FuJian Hua Feng Co. Ltd in Nanping city showed that the developed technology had achieved zero-draining, which was able to solve the pollution problem and produce biogas in winter. The sewage temperature of bio-tank of GFRP increased average 1.18°C more than that of bio-tank of reinforced concrete. And the average biogas-generating rate of bio-tank of GFRP of year 2009 was 0.45 m3·m-3·d-1, which increased 28% more than that of reinforced concrete. The indexes of COD, BOD, SS, NH3-N, and TP for the out-let wastewater of the treatment were 579.1 mg·L-1, 237.7 mg·L-1, 289.8 mg·L-1, 319.4 mg·L-1and 31.7 mg·L-1, respectively.
Two Novel Adams Model Encapsulation Methods in HLA Based Collaborative Product Development
Authors: Ma Cheng , Xiao Tian Yuan , Fan Wen Hui , Sun Hong Bo , Yue Ying Chao
Published: October 2011

As a well-known standard of distributed simulation, High Level Architecture (HLA) has adopted as basic framework in most distributed interactive simulation (DIS) systems. At the same time, DIS always involves multiple disciplinary simulation models which are supported by different software. And these software are not always compatible with HLA. For example, though widely used in mechanical kinetics and kinematics simulations, ADAMS, a multi-body kinetics simulation software cannot directly support HLA. To address this issue, this paper analyses redevelopment of legacy systems and models (such as Adams models) in DIS environment and proposes two encapsulation methods which is based on third-party software and user-defined subroutines respectively. A case study demonstrates the feasibility of the proposed methods. And a brief comparison is also given in conclusion section.
The Study of the Disabled Traffic Products Based on Product Safety
Authors: Ye Zhen He , Li Xin
Published: October 2011

The study of the disabled traffic products which is based on product safety was elaborated in this paper.Security is not only the first factor but also the most important basic principle of the disabled traffic products.We studied the considerations of security on the design of the disabled traffic products incluing structure, function identification, form, the color and so on in order to satisfy the safety needs of the disabled in physiological, psychological state for traffic products, summarize the safety approach of implementation of the disabled traffic products,reflect modern product design for disabled people "humanity" design concern.
The Inner Hole Precision Detection of Precision Machining Zirconia Ceramics Spindle
Authors: Lu Feng , Chen Shi Chao , Li Song Hua , Zhang Ke , Wu Yu Hou
Published: October 2011

The high-precision component named full ceramic high-speed electric spindle is used in high speed NC machine tools. Electric spindle have very high demand for the stability and dynamic balance of ceramic spindle when high-speed rotation. In order to ensure the smooth operation of high-speed spindle and realize the dynamic balance of the spindle, it is necessary to make a rigorous precision testing for the precision-processed spindle and obtain reliable data to meet the design standards and performance requirements of all ceramic high-speed spindle. In this paper, contact Surtronic25 type roughness measuring instrument is used for surface roughness analysis, and Leitz ultra PMM-C12.10.7 type tri-ordinate measuring machine is used for the roundness and cylindricity testing analysis of spindle hole, which can make the surface roughness, roundness, and cylindricity of the precision-processed zirconia ceramic spindle pore ​​to meet the design requirements and provide reliability safeguard to promote the using life and high-speed dynamic balance stability of the whole electric spindle.
Research on Periodic Motion Stability of Gear Dynamics with Friction
Authors: Wang Ji , Zheng Jian Hua , Xu Fu Shuai
Published: October 2011

Based on the nonlinear dynamical model of the gear system considering friction, the system periodic motion is studied by the Shooting algorithm, also the stability and bifurcation properties of the system periodic motion is obtained by Floquet multipliers. The system's evolvement properties are presented under different frictional coefficients. The conclusions are indicated that friction can influence the properties of periodic motion, which improves the stability of periodic motion on a certain extent, but produces new instability periodic motion. The conclusions provide a theoretical reference for designing of this system.
Research on High-Precision Automatic Inner Diameter Measuring System for Coaxial Transmission Line Outer Conductor
Authors: Zhan Li Jun , Wang Bao Guang , Ye Hong Yu
Published: October 2011

An automatic measuring system based on the principle of non-contact capacitive sensor for inner diameter measurement of the coaxial transmission line outer conductor (diameter:) is introduced in this paper. Through the theoretical analysis, the system also can be used to measure inner diameter of inclined holes. In this system, accuracy positioning is realized in the way that stepping motors cooperate with gratings; accuracy centering is realized by vision CCD system and X-Y accurate slide. Software VC++ is developed for the automatic measuring system. The function of accuracy centering, sensor calibration, automatic inner diameter measurement, data collection, data processing and data analysis are realized by software.
Finite Element Analysis for MW Wind Turbine Tower
Authors: Zhu Ren Sheng , Zheng Zhen Zhen , Liu Yong Mei , Shen Jian , Xiao Yang , Jiang Dong Xiang , Chen Jie
Published: October 2011

As the main load-bearing component, the tower supports the weight as well as the wind force and the dynamic load in operation of the wind turbine. It also endures the blow of itself. The level of the tower design directly affects the performance of wind turbines. This paper discusses static characteristic and dynamic model anasysis of the tower of an 1.5MW horizontal axis wind turbine. It is also about choice and calculation method of finite element.
Study on the Preparation of Dy-Doped TiO2 Nanotube Arrays and its Visible Light Responsive Photocatalytic Properties
Authors: Wang Zi Bo , Su Liu Yan , Guan Yu Jiang , Bai Shu Li
Published: October 2011

The in-suit Dy-doped titanium dioxide nanotubes arrays were prepared by anodic oxidation method using Dy (NO3)3·6H2O and pure Ti sheet. The sample was characterized by SEM, XRD and XPS for its size and structure. The photocatalytic properties of nanotubes arrays were researched by using methyl orange as target degradation under the visible light. The results showed that the catalytic activity of Dy-doped titanium dioxide nanotubes arrays was 72% under visible light. The catalyst has hight stability and potential industrial applications.
Experimental Research on Buckling of Nano-Thin Film under Impact Load
Authors: Li Peng , Li Linan , Tong Jing Wei , Wang Shi Bin , Zhang Min , Zhang Jing , Sun Heng
Published: October 2011

The experiments focused on thin film buckling under impact load had been completed. The axial impact experiments were done to different films on the PMMA substrate with the drop hammer device, the buckling images of the film surface were recorded after impact, and the problem of stress release was studied. It was found that buckle’s initiation and propagation were influenced by the materials of thin films and the impact times, and meanwhile buckle’s local distribution phenomenon was also found.
Preparation of AlNPs/CMCN Composite Nanofibers by Electrospinning
Authors: Xie Long , Shao Zi Qiang , Lv Shao Yi
Published: October 2011

The composite nanofibers of Aluminum nanoparticles (AlNPs) and carboxymethyl cellulose nitrate (CMCN) have been successfully fabricated by electro-spinning, the fibers combined good mechanical properties of the fibers and high burning rates of AlNPs have valuable applications in the propellant. TEM images showed that AlNPs distributed evenly into the composite nanofibers. The morphology and diameters of AlNPs/CMCN nanofibers were strongly influenced by the solution concentrations and electrostatic field strength. By optimizing the solution concentrations and electro-static field strength, the smooth AlNPs/CMCN nanofibers were prepared.
Influence of MoS2 on the Microstructures and Properties of Ni-Based Alloying Coating
Authors: Han Bin , Xue Min Peng , Yong Wang , Yu Meng Fei
Published: October 2011

Ni/MoS2composite coatings with different content of MoS2were produced on the surface of 1045 steel by laser cladding technology. SEM and EPMA were used to analyze the microstructures and micro area compositions of the coatings. Dry friction and wear properties of the coatings were tested by friction and wear tester. The results indicate that the microstructures of Ni/MoS2composite coating are large quantities of different-form white silicides and black sulfides distributing on the substrate. The sulfides mainly consist of CrxSy, MoS2and FeS. When the content of MoS2is 9%, Ni/MoS2composite coating exhibits best tribological properties.
On the Corrosion Behavior of Refined Bio-Oil during Rubbing Process
Authors: Xu Yu Fu , Li Wen Dong , Hu Xian Guo , Wang Qiong Jie
Published: October 2011

The corrosion behavior during friction of refined bio-oil by distillation process was evaluated by high frequency reciprocating test rig. Both scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to investigate the morphology and active elements contents on the rubbed surface on steel disk. The chemical structures of the oils and the topography and surface roughness of the wear scar were also studied by FTIR and surface roughness tester as well, respectively. The experimental results showed that corrosion behavior of bio-oil was improved after refining since the wear depth was 3.75µm and the worn surface roughness was 0.172µm, while they were 12.5µm and 0.217µm before refining. It was concluded that corrosion degree of worn surface was decreased after the bio-oil was refined, which was ascribed to the decrease of the acidic component content after the refining process.
The Adaptive Filtering Algorithms for Engine’s Noise Cancellation in Speech Signals
Authors: Zhao Xiu Ying , Wang Hong Yu , Fu De You , Zhou Hai Shen
Published: October 2011

The presence of noise superimposed on a signal limits the receiver’s ability to correctly identify the intended signal. The principal of adaptive noise cancellation is to acquire an estimation of the unwanted interfering signal and subtract it from the corrupted signal. Noise cancellation operation is controlled adaptively with the target of achieving improved signal to noise ratio. This paper describes the Least Mean Squares (LMS) adaptive filtering algorithm. The algorithm was implemented in Matlab and was tested for noise cancellation in speech signals.
Study on the Influence of the Quantity of Grooves on Performance of New Balance Drum
Authors: Lu He Quan , Mu Jie Gang , Zheng Shui Hua , Zhao Jin Jing , Wang Hui
Published: October 2011

A new type of balance drum with grooves was presented, and analyzed the influence of quantity of grooves on performance of centrifugal pump and balance force by the method of numerical simulation and experiment. The liquid flowing situation at the clearance and the differential pressure on both sides of the balance drum under different quantities of grooves were simulated. The efficiency, quantity of flow and axial force were measured by the experiments with different test devices. After comparing and analyzing the results of simulations and experiments, it indicate that with the increase of grooves the resistance in the clearance increase, the leakage losses reduce, the efficiency of pump enhance and the differential pressure between both sides of the balance drum increase, which contributes to balance the axial force.
The Design of Electromagnetic Flowmeter in Partially Filled Pipes
Authors: Wei Kai Xia , Hao Shu Rong
Published: October 2011

This paper designs the electromagnetic flowmeter in partially filled pipes (EMF-PF), which sensor sets four electrodes. One pair of the electrodes is set on the pipe bottom as the signal injection electrodes that inject the AC pulses used to determine liquid fill height. One pair of long-arc electrodes is set on the pipe wall as the measurement electrodes. The measurement electrodes alternate duties, sensing both the flow and fill height signals. Both the flow and fill height raw signals are disposed in different time period by the same signal processing channels. Experiment result shows that the designed EMF-PF can achieve the flow measurement in partially filled pipes, and the measurement accuracy of this EMF-PF meets the actual requirements.
A Method of Stabilizing Semiconductor Laser Power
Authors: Yuan Qi Ping , Zheng Tian Mei , Tong Zheng Rong , Yang Xiu Feng , Cao Ye
Published: October 2011

For the influence of the temperature and current, the power of semiconductor laser fluctuates constantly. So this paper comes up with a new method to solve this problem. The design of peripheral circuit contains two parts: temperature control and power control. The system of temperature control uses special laser temperature control chip, which realizes the accuracy of 0.01°C. The system of power control adopts hardware PI control, over-current protection, over-voltage protection, and temperature protection. Temperature compensation is added to the circuit, which realizes the accuracy of 0.01mW.
Design of A 3-10 GHz Low Phase Noise YIG-Tuned Oscillator
Authors: Li Deng Bao , Jiang Wan Shun
Published: October 2011

In this paper, a YIG-tuned oscillator with low phase noise is designed successfully, the frequency range of 3 to 10 GHz, which is based on the theory of oscillation phase noise model and yttrium iron garnet (YIG) sphere’s characteristic. Its typical measure phase noise is-123.3 dBc at 100 kHz offset and-141.2 dBc/Hz at 1 MHz and-148 dBc/Hz at 10 MHz from carrier, and its minimum power output is more than 13 dBm across most of the band. The approach used to design the oscillator circuit will be discussed and test data will be presented.
Optimum Design of a Magnetic Circuit in a Magneto-Rheological Damper
Authors: Yu Guo Jun , Du Cheng Bin , Li Zhi Quan
Published: October 2011

Numerical simulation and experimental analysis for a magnetic circuit model of a damper were carried out by adjusting the size of the auxiliary gap to obtain greater magnetic field strength and wider adjustable multiples of the damping force. Results of experiment indicate that there is a specific ratio of sizes between the auxiliary gap and the working gap; this gap ratio is 3:1. The adjustable multiple and gap ratio is validated by the results of the experiment. The largest value for the magnetic induction in the working gap can reach 80–90% of the maximum; the least value is close to zero, and the adjustable multiple of the magnetic induction is near about a factor of 7. Experimental data also indicate that the law of the magnetic flux leakage is affected by the size of auxiliary gap as well as the intensity and direction of the current. Performance testing of the real optimal damper reveals that the maximum damping force of the damper is 195.7 kN, which is ~92.7 percent of the theoretical maximum value, at a gap ratio of 1:2.5.
Anti-Scaling Effect Comparison of High-Frequency Electromagnetic Pulses Stimulation in Different Processing Chambers
Authors: Xiong Lan , Wu Yi Mei , Xi Zhao Hui , Shi Lin Lin , Miao Xue Fei
Published: October 2011

Processing chamber is important part of high-frequency electromagnetic, water processor, In order to determine what kind of processing chamber has better effect to the anti-scal, the paper simulates electromagnetic energy distribution in two common processing chambers by using the software Ansoft Maxwell, which is based on the finite element method. One processing chamber is set with coaxial electrodes and the other one is wrapped by spirals, both are composed by high-frequency electromagnetic pulses. According to the simulation data, electromagnetic energy of processing chamber with coaxial electrodes is much bigger than that of spiral wrapped process chamber. Meanwhile, a mini–circulating water system is built and water quality experiments are completed. Analysis results from experimental data illustrate that two kinds of processing chambers under high-frequency pulsed field have anti-scaling effects, but the processing chamber with coaxial electrodes is much better.
Dew Points of C4F8/N2 Gas Mixtures
Authors: Li Kang , Niu Wen Hao , Zhang Guo Qiang
Published: October 2011

C4F8/N2 gas mixtures are possible substitutes for SF6, because of its good insulation characteristics and low influence to environment. The thrust of this paper is to verify the dew point of C4F8 and C4F8/N2 gas mixtures, the dew points of C4F8/N2 mixtures are achieved using experimentally measuring and theory calculating method. The experimental data obtained is compared to that predicted from the Clausius-Clapeyron equation, Trouton’s rule and vapor pressure equation. The results show that the experimental data verify well with the predictions. So the prediction method can be used to predict the dew point of C4F8/N2 gas mixtures for different charging pressures.
Effect of Modified-Silicon Rubber on Thermal Degradation and Anti-Droplet Properties of Polyamide 6/Melamine Cyanurate Flame Retardant Composites
Authors: Feng Na , Liu Jian Hui , Uyama Hiroshi , Liu Wei
Published: October 2011

In this paper, the effect of modified-silicon rubber (MSR) on thermal degradation and anti-droplet properties of melamine cyanurate (MCA) flame retardant polyamide 6 (PA6) composites was studied by using thermogravimetric analysis (TG) and vertical burning test. TG analyses indicated that modified-silicon rubber could markedly promote the condensation process of PA6/MCA/MSR composites compared with PA6/MCA composites, and the char residue of PA6/MCA/MSR composites at 600¡æwas much higher than that of PA6/MCA composites. DTGcurves showed that MSR could slow down the rate of degradation of PA6/MCA composites. More importantly, there was no melt-drip produced when PA6/MCA/MSR composites was burning. It was concluded that MSR increase the thermal stability of composites and could effectively prevent the formation of melt drip.
Sintering, Microstructure and Dielectric Properties of Ca-Al-B-Si-O Glass/Al2O3 Composites with Various SiO2 Content
Authors: Liu Ming , Zhou Hong Qing , Zhu Hai Kui , Liu Min , Zhao Jian Xin
Published: October 2011

The effects of silicon dioxide addition on the sintering, microstructure and microwave dielectric properties of Ca-Al-B-Si-O glass/Al2O3 composites were investigated. Results show that: Increasing the silicon dioxide content in the glass leads to the corresponding rise of bulk density, dielectric constant of the LTCC materials and the decrease of its dielectric loss and porosity. A bulk density of 2.92 g·cm-3, a porosity of 0.2%, aεr value of 7.11 and a tan δ value of 0.00096(measured at 10 MHz) are obtained for 68 wt% silicon dioxide of the samples sintered at 875°C for 30 min.
The Design Practice and Implementation of a Flyback Converter
Authors: Ho Tze Yee , Lin Chih Hsien , Yang Lung Hsian
Published: October 2011

The design practice and simulation as well as implementation of a flyback converter are presented in this paper. Detail design considerations for each component in flyback converter are addressed and discussed. Based on the simulation results, a flyback converter is then realized and implemented. The experimental results show the verification for the design and implementation of the flyback converter. This paper concludes that the design of a flyback converter based on the proposed design practice, can reduce the development schedule duration and further alleviate the human resources need.
A Decision-Making Model of Energy-Saving Design and a Case Study
Authors: He Ping , Liu Guang Fu , Zhou Dan
Published: October 2011

Pursuing the green design (GD) of products is highly beneficial in the alleviation of environment burdens. In order to gain such benefits, GD is involved in entire product lifecycle. During the product lifecycle, energy-saving is one of the main roots of environmental pollution, with the optimal calculation of the total energy consumption for GD being an important path to reduce the environmental pollution. The objective factors of decision-making problems in the traditional product design are usually three: life、quality and cost; but from the viewpoint of GD, energy consumption should also be considered. Energy design factor (E) is the essential coefficient of the model of the energy consumption throughout the entire product lifecycle. In this paper, a multi-object decision-making model of energy-saving design for GD is put forward, in which the objects of life (L), quality (Q), cost (C) and energy design factor (E) are considered together. A case study on a decision-making problem of energy-saving design in the design process of a machine tool’s transmission is analyzed, the result showing that the model is practical.
Application of Magnetic Material in Magneto Suction Cupule of Crane
Authors: Ma Jing Lan , Wang Wei , Li Wei
Published: October 2011

In order to realize safety, saving energy and material in the design and manufacture of the magneto suction cupule of crane, This text discussed how to select the permanent magnetic material and soft magnetic material, how to design the magnetic circuit and the method of magnetization and demagnetization and so on. It is emphasized on the structure of magneto suction cupule of crane made of AlNiCo and NdFeB permanent magnetic material or the combination of the two kinds of material, the application of RLC circuit in magnetizing and demagnetizing with pulse current to realize the light weight and low cost for the magneto suction cupule of crane.
An Open Communication Architecture for Multi-Robots in Complex Environment
Authors: Duan De Quan , Wang Chuan
Published: October 2011

In this paper, the advantages and disadvantages of different communication means of multi-robots were analyzed. Then, a explicit communication together with implicit communication architecture was proposed, which takes advantage of the social laws established for them to cut down the communication traffic and achieve reciprocal communication among robots. The validity of the foregoing methods has been testified by the simulation experiments of the collaborative surround of Multi-robots.
Modality Analysis Based on FEM of RC Deep Beams with Opening
Authors: Liu Hua Xin , Bi Zhong
Published: October 2011

The modality analysis of the reinforced concrete supported deep beams with opening is worked out by Finite Element Software ANSYS to obtain eight exponent natural vibration frequencies and modal charts. The result of three exponent natural vibration frequencies is agreement with the result of dynamic analysises. The preceding foundamental work is finished in order to do dynamic analysises and aseismic design of reinforced concrete deep beams with openings.
Numerical Analysis of Shear Lag Effect for Concrete Huge Section Box Grider
Authors: Zhu Ming Qiao , Huo Hai Qiang , Wu Shao Hui
Published: October 2011

Through a lot of investigations and studies ,and refering to the current related technical specifications and relevant reference, and combining with the characteristics of the ordinary concrete box section component , single box double room concrete huge section box girder which can realize city bridges double traffic is devised creatively,considering of the need of structure and function. By choosing proper element type and material modle, the designed box grider is modeled by the nonlinear analysis software ANSYS. The shear lag effect of the concrete huge section box girder is studied by applying four load conditions including prestressed load, the upper and lower live load and double load. Parameter analysis are done, which include the load type and width-span ratio.And corresponding conclusions are drawn.
Application Comparison about Sediment Deposition in Outer Channel by Three-Layer Mode and Analog Analysis Mode
Authors: Feng Xiao Xiang , Liu Zhe , Wang Xing Kui
Published: October 2011

Sudden sedimentation is an important subject for building ports in silt-sandy coast. It elaborates calculation methods detailed about three-layer deposition mode and analogy analysis mode. And they are used to predict the deposition in outer channel of Binzhou Port. Comparative results show that they are basically same on the distribution of sudden sedimentation, deposition thickness and volume along the channel. And it is larger from three-layer deposition mode than analogy analysis mode. The formal mode is propitious to project security. By analyzing the characteristics and applicability about two methods, basic law is obtained for sediment movement and predicting methods under strong wind in the outer channel of silt-sandy coast.
Numerical Study of XCP Probe's Fluid Dynamic Characteristics
Authors: Liu Ning , Zhang Rui , Chen Wen Yi , Zhang Man Man
Published: October 2011

Applied the finite volume method combining two-equations turbulence model,the influence of fluid dynamic characteristics on XCP probe under different factors be studied The fluid dynamic characteristics were researched under different influencing factors, such as falling speed, rotating rate,seawater density,etc. The drag coefficient under the different falling speeds and the limited velocity of submarine steady motion were obtained. Compared with the experimental results, the simulated results agree well with experimental results, the experiments have show the validity and feasibility of the numerical analysis method. These results will provide theory reference for selecting the reasonable rotating rate, analyzing stability and the movement rule of probe in the water, choosing suitable test parameters for XCP probe of different seawaters.
Paper Based Microfluidic Device Using Surface Acoustic Wave as Driving Source
Authors: Zhang An Liang , Han Qing Jiang
Published: October 2011

It is necessary to implement pretreatment operations for a paper based microfluidic device. A paper based microfluidic device with SAW driving microfluid has been implemented. Trance analyte to be detected was absorbed into a filter paper at first, and mounted on PDMS blocks on a piezoelectric substrate to ensure that the indicting filter paper has a little gap with the piezoelectric substrate. Reagents were then pipetted on the piezoelectric substrate and transported by surface acoustic wave excited by an interdigital transducer, which was fabricated on a 1280-yx LiNbO3 using micro-electrical technology. A color was developed due to chemical reaction, and the analyte concentration was evaluated by its grey value. Nitrate ion was detected using the microfluidic system.
An Improved Method for Visual Word Generation Based on Kernel Function
Authors: Wang Hong Xia , Yang Ke Jian , Gao Feng
Published: October 2011

This paper studies a novel visual word generation method in the Bag-of-words model for object categorization. The conventional Bag-of-words algorithm represents the cluster centers as visual words, which led to the incomplete expressions of image semantic information, so an improved method for visual word generation using the soft-decision based on kernel function is proposed. First, SIFT keypoints of images are extracted. Then, after clustering SIFT keypoints, some typical SIFT keypoints are selected from a cluster by kernel density estimation using a kernel function. Finally, these selected keypoints are trained employing SVM to generate a visual word of this cluster. Experimental results show that the proposed visual word generation method enhances the expressions of image semantic information, increases the recall ratio effectively, and improves significantly the effect of object categorization.