bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Intelligent Display Meter Based on ARM
Authors: Gan Ke , Peng Xi Wei , Zhao Zhan Dong
Published: December 2012

Display meter is the basic unit of automation system. In order to improve the performance and the compatibility of display meter, a design of intelligent display meter based on ARM is put forward. The Micro Control Unit (MCU) STM32F103VE based on the 32 bit ARM Cortex–M3 core is used as the host controller of the meter system. On the basis of this controller, hardware and software design were carried out. The intelligent display meter can receive voltage and current signals from most sensors. Because of the excellent processing capability and rich peripherals of the MCU, the meter can handle large amounts of data rapidly so as to monitor the status of industrial field in real time and communicate with different upper computers.
Progress in the Development of a Miniature Mass Spectrometry
Authors: Yu Quan , Ni Kai , Tang Fei , Wang Xiao Hao
Published: December 2012

Mass spectrometer is one of the most versatile tools in current analytical science, which can perform both qualitative and quantitative chemical identification with high sensitivity, high accuracy and low consumption. Currently, the development of miniature mass spectrometer has received growing interest, since it provides a rapid way for online detection and real-time analysis. Quadrupole analyzer has been widely used in quantitative analysis, and it can be easily miniaturized for the purpose of developing portable mass spectrometers. A portable quadrupole mass spectrometer was developed for in-situ analysis, which can perform both qualitative and quantitative analysis for solid or liquid samples in atmospheric conditions.
Research on Characteristics of Human Gait by Electrostatic Detection
Authors: Li Peng Fei
Published: December 2012

Electrostatic detection is remarkably developed and has been employed to detect human activity for years. In this paper, an induction electrostatic detector is designed, and used to measure human walking signals. The gait signals of totally six segments of the same object are measured in the experiment. An algorithm is proposed to obtain accurate gait cycle. The original signals are transformed to correlation coefficient series. Peaks of correlation coefficient series is picked out as the same phase point instead of peaks of walking signal. The time between very second peaks is defined as gait cycle of object. Based on the gait cycle, we discussed the recurrence property as the characteristics of human beings. It is expected that the slope of the recurrence line can be used as an index, and will indicate the personal particularity of objects in detection and their physical conditions.
Analysis of Charge Circuit and Discharge Circuit in Electromagnetic Riveting
Authors: Deng Jiang Hua , Zheng Yi Ming , Tang Chao , Zhan Yan Ran
Published: December 2012

The analysis of charge circuit and discharge circuit is a key part in the theoretical study of electromagnetic riveting electromagnetic field. Numerical simulation was used to establish the charge circuit model and the discharge circuit model which was an electric circuit-magnetic circuit coupling process by ANSYS. The simulation of charge circuit shows that the development of the charge current over time is an exponential descending change and that of the charge voltage over time is an exponential ascending change. And, the simulation of discharge circuit indicates that the driver is mainly subjected to axial magnetic force, whose distribution is non-uniform along the radial direction of driver, and the maximum value of axial magnetic force locates in about half of the driver radius.
The Improved Method of On-Line Detection of Trace Iron in Power Station Steam-Water Based on O-Phenanthroline Spectrophotography
Authors: Li Chang Ming , Zhao Yi , Yuan Pei Pei , Wang Bing
Published: December 2012

An on-line detection system, which detected for µg/L level of iron, combined the automatic concentrate device and o-phenanthroline spectrophotography. The improved method has four innovations: the automatic concentrate device, the airtight structure of storing ammonia, a temperature sensor controlled the action of the rotating and dumping, an electronic balance with magnetic stirring to control the coloration process. The detection limit for iron was 0.717μg/L, the sensitivity of the improved method was 0.020. The obtained results by using the improved method were in good agreement with those obtained from graphite furnace atomic absorption spectrometry.
Design of the FMC Intelligent Controller
Authors: Huang Ke Wang
Published: December 2012

Designed an intelligent controller for FMC, this kind of intelligent controller can provide a variety of functional interfaces. Connected to the MCU and operated by the MCU will be very convenient. It provides DMA channels, which are used to transfer large data blocks. Most of the FMC can be easily controlled by the intelligent controller. It can be a separate hardware or combined in a smart chip with the FMC.
Decrement Signal Generator of High-Precision E Exponential Based on ARM
Authors: Yin Bing Qi , Wang Yuan , Yang Li , Guan Shan Shan , Tian Pei Pei , Li Su Yi
Published: December 2012

With the development of electronic technology, the signal generator used in most of the lab employs direct digital synthesis (DDS) technology. The signal generator using digital technology has advantages of high resolution and short conversion time and so on [1, 2]. Through ARM chip STM32F103VET6, we realize the control to the chip AD5791. At the same time, it engender high-accuracy periodic e exponential decremented signal. Doing above, we correct transient electromagnetic system which has been manufactured. The output signal amplitude is 5V. Frequency can be adjusted according to the sampling points and sampling time of the receiving device.
Design and Application of Decision Support System for Power Loss Reduction of Rural Power Network
Authors: Chen Bing Xia , Tan Jian Cheng
Published: December 2012

Theoretical line loss calculation is the basis of line loss analysis and decision-making in loss reduction. Due to technical constraints in the past, traditional theoretical line loss calculation method uses a large number of simplified calculations. This paper proposes a new online method of line loss calculation in distribution networks which is based on PQU (active power, reactive power and voltage) load curves. The proposed method has a large amount of data operation and thus can accurately reflect the load variation with time. Based on a new kind of metrical equipment and the proposed method, the assistant decision system for comprehensive power loss reduction of rural power network has been developed and has been tested on several rural power networks. The results show its convenience, accurate calculation and high efficiency.
Electric Leakage Protection System Based on Wireless Monitoring Network
Authors: Zhao Xiang , Wang Zhi Yuan
Published: December 2012

This paper introduces a monitoring system for electric leakage protection based on AVR Single-Chip Computer, which the terminal monitoring PC communicates with AVR single-chip computer through wireless channel, so as to monitor the operational status of the residual current protective device (RCD) in real time. In addition, taking both amplitude and phase angle of the residual current as leakage protection judgment parameters could increase the accuracy of RCD effectively.
AC-DC Converter with Power Factor Correction Function
Authors: Do Hyun Lark
Published: December 2012

An AC -DC converter with power factor correction (PFC) function is proposed in this paper. In the proposed converter, the boost PFC stage and the active-clamp DC-DC converter stage are merged into a single converter to reduce the overall cost and improve the power density. An active-clamp DC-DC converter stage can suppress the switch voltage stresses and provide zero-voltage-switching (ZVS) operation of the switches. The boost converter in PFC stage operates in discontinuous conduction mode (DCM) and it provides naturally high power factor. Due to the ZVS operation, the switching losses of the proposed converter are significantly reduced and the efficiency is improved. Steady-state analysis is performed. Simulation results are also provided to verify the effectiveness of the proposed converter.
Numerical Simulations of TWC Light Off Characteristics Based on Amesim
Authors: Wu Zhuang Wen , Feng Guan Ming , Chen Hong , Hu Da Hong
Published: December 2012

Using AMESim to build a three-way catalytic converter （TWC） physical model to study the light off characteristics, through numerical solution of the energy and mass conservation quations of gas-solid two phase. This paper obtains the emissions conversion rate curve, such as CO, unburned hydrocarbons (CaHb) and nitrogen oxides (NOx) under different parameters. The results show that, the engine control strategy, allocation of TWC and it’s structure are all the TWC light off characteristics effects, which provids the theory basis for the TWC designers.
The Application of HPLC for the Detection of tHcy and the Diagnosis of Central Retinal Artery Occlusion
Authors: Zhou Hong Yan , Zhang Wen Song , Wang Li Na , Hao Ji Long , Wang Shuang , Zhang Hong
Published: December 2012

To study the clinical application of high performance liquid chromatography（HPLC)、Radioimmunodetection and Automatic biochemical Analyzer on the detection of plasma total homocysteine(tHcy)、folic acid（FA）、VitB12、Triglyceride（TG）、total cholesterol(Ch)、high density lipoprotein cholesferol(HDL-C)、low density lipoprotein cholestorol(LDL-C).Clarify the mecanism of plasma total homocysteine(tHcy) inducing central retinal artery occlusion(CRAO) Methods We measure the level of plasma tHcy、 folic acid、 VitB12、 blood sugar、 blood pressure and blood lipid by the instrumentations above.Results:The level of plasma tHcy in CRAO group increase while the level of plasma folic acid reduce.Conclusions:We discovered biomarkers of CRAO.HPLC、Radioimmunodetection and Automatic biochemical Analyzer can be used well for the detection of the biochemistry markers above.The value of plasma tHcy can damage capillary blood vessel endotheliocyte and give an impetus to CRAO.HPLC maybe an optimal method for the clinical screening of CRAO.
Inductosyn Angle Measurement Method Based on the Pulse Subdivision
Authors: Zhou Wei , Zhang Jun , Wang Si Qi , Zhu Kai , Xu Zi Li
Published: December 2012

For the inductosyn angle measuring system axial angle digital converter integral loop and the VCO linear range restricted problem of tracking speed and control voltage, angle measurement system has been developed, the angle measurement system based on time subdivision method. The system mainly consists of rotary table, excitation power, signal pick-up circuit, FPGA control module, display module, and serial communications modules and host computer. FPGA is used as control core in the angle measuring system, and the high-speed FPGA signal processing has satisfied the measurement requirements. Induction signal is subdivided by high-frequency clock pulse. Angle measuring system has achieved angle measurement and communication functions. The experimental results show that the angle measurement system accuracy is ±3".
Research of Precision Conditioning Circuit in Laser Differential Confocal Sensor
Authors: Guo Jun Jie , Qiu Li Rong , Zhao Wei Qian
Published: December 2012

Laser differential confocal sensor (LDCS) is a high precision and high integrated measurement system. In order to meet the demand of the LDCS, a novel implementation method of high precision conditioning circuit is studied. This circuit consists of photoelectric conversion, secondary amplification and signal operation. The photoelectric conversion is designed to detect the light intensity signal and transform it into a voltage signal. In order to adapt the test for different samples, the magnification is adjustable in secondary amplification unit. The two-way light intensity signals of the LDCS are differentially subtracted in signal operation unit. The noise characteristics of the photoelectric conversion unit were analyzed and the methods for decreasing noise were presented. The experimental results show that signal to noise ratio (SNR) of the conditioning circuit is better than 1160 and the sensitivity of LDCS reaches 2.168V/μm, which has the advantages of low noise, high stability and high integration and can widely used in many kinds of high precision photoelectric measurement systems.
Application of Differential Interference in Electromagnetic Rail Gun Strain Measurement
Authors: Gu Jin Liang , Luo Hong E , Qiang Ke Jie , Li Bao Ming
Published: December 2012

Strain measurement in electromagnetic rail launching processes is of significant importance to studies on rail life, wrap material selection, and initial armature disturbance. Based on a discussion about the principle of fiber-optic differential strain measurement, the constitution of a rail strain measurement device based on fiber-optic differential interference was introduced, and its data processing method and system calibration method were discussed. With this measurement method, electromagnetic rail strain measurement was completed, and experimental results indicate that the differential strain measurement device is able to operate reliably and stably under an intense electromagnetic interference environment in an electromagnetic railgun launching process and can be applied to strain measurement and in-bore projectile motion velocity measurement of gun barrel weapons.
Ethanol Gas Sensor Based on Self-Assembled Multi-Walled Carbon Nanotube Film
Authors: Wang Kai , Zhang Dong Zhi , Tong Jun , Xia Bo Kai
Published: December 2012

A multi-walled carbon nanotube (MWNT) film-based sensor was fabricated using layer-by-layer self-assembly method, and its ethanol gas-sensing properties with varying gas concentration are characterized at room temperature. The experiment results shown that the layer-by-layer self-assembled MWNT film sensor exhibit a fast response and linear resistance change when exposed to ethanol gas, indicated a prospective application for ethanol gas detection with high performance and low-cost.
A Direct Measurement Method of Building’s Shunt Coefficient
Authors: Zhang Xiao Chun , Sun Xiu Bin , Mou Xiang Yong
Published: December 2012

The shunt coefficient of a model of constructions was measured by a pulse current generator, an induction coil, a digital oscilloscope. The experimental results demonstrate that the method is effective, the distribution of pulse current in a buildings can be directly measured without damage.
Design of Strain Sensor with High Accuracy Used under Water
Authors: Zhang Ai Jun , Xie Xiao Min , Liu Ya Shu , Wang Chang Ming
Published: December 2012

The purpose of the paper is to design a sensor to satisfy the need of the strain transmission measurement for the underwater gun. In this paper, after a statement of the working principle of the sensor system, the entirely standards sensor making process involving the performance and intensity limitation of the strain tube are conducted. Then this will be followed by an analysis of the working bridge road. Finally, by the existing standard sensor, the designed sensor is calibrated and contrasted. The test results show that the designed strain cylinder sensor offers advantages over linearity, and hence can be used in engineering practice.
Real-Time Monitoring of Hydrogen Sulfide in Air by Cataluminescence-Based Gas Sensor
Authors: Zhou Kao Wen , Yang Hong Wei , Li Xu Fei , Yang Yan Ying
Published: December 2012

A cataluminescence (CTL)-based gas sensor utilizing nano-sized Mn1.5Zr2O7 as the sensing material for the determination of hydrogen sulfide in air was proposed. The gas sensor showed high selectivity for hydrogen sulfide at 450 nm and satisfying activity at 320°C. The linear range of the CTL intensity versus concentration of hydrogen sulfide was 2~95 mg/m3, and the detection limit (3σ) was 1.5 mg/m3. No interference was observed while the foreign substances, such as formaldehyde, ammonia, ethanol, benzene, carbon monoxide and sulfur dioxide, were passing through the sensor. The gas sensor displayed good stability for continuously introducing hydrogen sulfide over 60 h, and allowed real-time monitoring of hydrogen sulfide in air.
Study on the Dynamic Character of the Six-Axis Heavy Force Sensor
Authors: Lin Sheng , Wang Xiao Yu , Jia Zhen Yuan
Published: December 2012

Six-axis heavy force sensor will be used to measure the dynamic load of the heavy load equipment. Therefore, the dynamic character of the six-axis heavy force sensor is important. In this paper, a six-axis heavy force sensor based on the Stewart platform is developed. A dynamic measurement system is established to measure the dynamic character of the six-axis heavy force sensor. The hammer impact method is used to measure the natural frequency of the six-axis heavy force sensor. The power spectrum analysis of each channel is conducted. And the natural frequency of each channel is obtained.
Research on Link Loss Rate Inference Based on Data Aggregation in Wireless Sensor Network
Authors: Ji Wen Li , Yao Jun
Published: December 2012

The internal link loss characteristic inference has become an increasingly important issue for operating and evaluating a wireless sensor network. In this paper we propose a new algorithm, based on MPLE algorithm and binary hamming distance and hop count, to infer the internal link loss characteristics. First, we use the MPLE model to part the problem of inference into the serial of sub-problem, a sub-problem is compose of subtree that contain two leaf nodes. Then, we select the subtree by using hamming distance of the sequences at each pair of nodes and incorporating the hop count available at each node in WSN. finally the Pseudo-Likelihood Function (PLF) is used to solve the problem. The simulation shows that the link loss performance parameters can be inferred accurately, and the proposed algorithm scales well according to the sensor network size.
Results Concerning the Combustion of Liquid Biofuels
Authors: Călugăru Florentina , Bărăscu Antoaneta Maria
Published: December 2012

This paper presents results concerning the vegetable oils as an renewable energy source, with applications for production of electricity or heat. The experiments followed the ignition and the stability of the combustion process of the liquid biofuels and the evaluation of pollutants emissions. The combustion process of liquid fuels additivated with vegetable oils proves their advantage from the point of view of energy efficiency and of the environment protection, the emissions values falling in the allowed interval.
Dynamic Modelling and Simulation of an Auto Vehicle Steering Mechanism Considering its Elements as Flexible
Authors: Marinescu Gabriel Cătălin , Dumitru Nicolae , Geonea Ionut
Published: December 2012

The paper presents the dynamic analysis of a steering mechanism for a road vehicle, considering the deformability of some elements, such as the steering tie rods. Both the steering and suspension mechanisms were analysed form structural point of view. The kinematic scheme of the assembly was done, followed by a study of their parts and kinematic joints. Then, there was calculated the degree of mobility of the mechanism. The dynamic analysis was approached in case of a stationary vehicle. Considering the geometry of the real model, it was designed the 3D model of the mechanisms assembly. Respecting the positioning on the vehicle, the model was exported to the Adams View software, where the components were assembled, defining the kinematics joints. The values obtained by simulations are compared to those obtained by experimental means. Also, results can be used to optimize aspects of the mechanical system. Finite element analysis was performed to study the contact stress distribution of the rack and pinion gear, considering wheels-road contact and also the friction from the spherical and cylindrical joints of the mechanism. The rack and pinion gear was defined by coupling the rotational motion of the pinion with the translation of the rack.
Procedure Selection Bearing Reducer TwinSpin for Robotic Arm
Authors: Semjon Ján , Hajduk Mikuláš , Jánoš Rudolf , Tuleja Peter
Published: December 2012

The current mechanical engineering applications require the use of increasingly larger share precision reducers and special mechatronics units with a high degree of integration. High precision gearboxes is used for such applications with low backlash and high torsional stiffness (harmonic, cycloidal or planetary). Bearing reducers (cycloidal gear) meet the requirements of small built-in space in the implementation a high-precision change of transfers. Bearing reducers TwinSpin from company Spinea accurately fulfil all of these conflicting requirements.
An Aerothermodynamic and Mass-Model Integrated Optimization Framework for Highly-Integrated Forebody-Inlet Configurations
Authors: Sarosh Ali , Yun-Feng Dong , Shoaib Muhammad
Published: December 2012

A framework methodology for multidisciplinary multiobjective optimization and analysis is proposed. It is based on analytical aerothermodynamics and mass-modeling parameters of highly-integrated forebody-inlet configuration and representative hypersonic flight vehicle respectively. A complex configuration for a highly-integrated waverider forebody attached to planar compression ramps and planar sidewalled-inlet system is studied. Optimization and analytical solutions are obtained using SHWAMIDOF-FI design tool. Results show substantial improvement in geometric, performance and flow parameters as compared to baseline configuration.
Mission Aspects and its Relation to Sequential System Reliability
Authors: Koucky Miroslav , Valis David
Published: December 2012

Complex mechatronic systems sometimes do work in difficult and adverse environment. Such environment may affect the system’s performance and also dependability characteristics. Since we use complex systems with one shot items we need to know basic characteristics of such a system. The paper deals with advanced mathematical methods used for field data assessment in order to prove presumed impact of mission profile and system real operation profile onto system reliability. Thank to the collected data set it is assumed that operation of the system is actually a kind of time series. The paper presents identification of the time series model, its parameters´ estimation and prediction of system characteristics – like reliability/survivability function of the system for instance. Since the model of the time series has not been known, correlations with other system can be further determined and mission duration estimated. This estimation helps to organize support and operation of the system.
An Improved and Efficient Algorithm for SINS/GPS/Doppler Integrated Navigation Systems
Authors: Ushaq Muhammad , Fang Jian Cheng
Published: December 2012

Inertial navigation systems exhibit position errors that tend to grow with time in an unbounded mode. This degradation is due, in part, to errors in the initialization of the inertial measurement unit and inertial sensor imperfections such as accelerometer biases and gyroscope drifts. Mitigation to this growth and bounding the errors is to update the inertial navigation system periodically with external position (and/or velocity, attitude) fixes. The synergistic effect is obtained through external measurements updating the inertial navigation system using Kalman filter algorithm. It is a natural requirement that the inertial data and data from the external aids be combined in an optimal and efficient manner. In this paper an efficient method for integration of Strapdown Inertia Navigation System (SINS), Global Positioning System (GPS) and Doppler radar is presented using a centralized linear Kalman filter by treating vector measurements with uncorrelated errors as scalars. Two main advantages have been obtained with this improved scheme. First is the reduced computation time as the number of arithmetic computation required for processing a vector as successive scalar measurements is significantly less than the corresponding number of operations for vector measurement processing. Second advantage is the improved numerical accuracy as avoiding matrix inversion in the implementation of covariance equations improves the robustness of the covariance computations against round off errors.
Integral Sliding-Mode Control with Applications to Aircraft Dynamics
Authors: Ene Costin
Published: December 2012

A Continuous Sliding-Mode Controller (CSMC) using integral action is implemented to control the response of the longitudinal dynamics of an aircraft. Model-following of the pitch rate q is obtained through this method. Asymptotic regulation achieved by integral control has its downsides because transient performance is reduced. A solution to this problem consists in using the integral action only “conditionally”, thus eliminating the performance downgrade. Finally a comparison will show how Sliding-mode control will minimize the chattering phenomenon and also reduce “integrator windup” problem, thus minimizing the loss of transient performance.
Misbehavior in High Temperature Equilibrium of Water-Gas Reaction
Authors: Rugescu Radu Dan , Bacaran Florin Radu
Published: December 2012

The observation that the chemical equilibrium between the combustion products of solid propellant samples within static calorimeters is unexpectedly freezing at high temperatures is proved through a general numerical simulation of the isochoric cooling with chemical reactions between the gaseous products. A proprietary, direct linearization method of thermochemical computation is used that enables following any chemical reaction in equilibrium with high convergence. The observed chemical freezing within calorimeters is proved.
Evaluation of Surface Roughness Variations of Solid Dosage Forms in Simulated Physiological Conditions
Authors: Stamate Monica Cretan , Gafitanu Carmen , Stamate Ciprian , Gafitanu Eliza
Published: December 2012

Rehabilitation of joints that underwent major surgery, involves reducing postoperative pain and inflammation. Many pharmaceutical product used in reducing joint pain are based on the extended-release technology and becoming increasingly important in research domain. The performance of extended-release matrix tablets is dependent on the solid dosage properties like matrix materials used, which are semi-synthetic polymer like hydroxypropyl methylcellulose (HPMC) and sodium carboxy methylcellulose (Na CMC). Depending on the properties of the polymer used, drug release from the tablets may be controlled by erosion mechanism and surface roughness. In a physiological environment, the release of drug from a solid dosage form requires a gradual erosion of solid shape with simultaneous change of surface roughness. This paper presents the influence of surface erosion of solid dosage forms on the surface roughness and the release of the analgesic and anti-inflammatory substances in a biological environment similar to the human digestive juice.
Experimental Evaluation of the Response Time of Magnetorheological Dampers Subjected to Impact Loading
Authors: Zhang Li Jie , Chang Jia Dong , Wang Jiong
Published: December 2012

In recoil mechanisms applications the response time is an important characteristic for Magnetorheological (MR) fluid dampers, since the recoil cycle is very fast. Method for experimental testing the response time of MR dampers subjected to impact loading was promoted and impact tests were done. Since the viscose damping force of MR dampers is only related to the recoil velocity, which can not be controlled by the operating current, only the controllable damping force response to the input voltage was evaluated, and the viscose damping force were removed by the MR damper’s model. Two factors that may have effect on the response of MR dampers were considered the response of the electromagnetic circuit current of MR damper coils, and the response characteristic of MR fluid material. PI control algorithm was used to shorten the circuit current response. The results indicated that, compared with the much shorter delay of MR fluid, the driving circuit response has more significant effect on the MR dampers’ response time. What’s more, it was also verified that, it is feasible to improve the MR dampers’ response time subjected to impact loading by modifying the electromagnetic circuit through good control algorithms.
Analysis on Hybrid Effects of Parallel Pneumatic Hybrid Vehicle
Authors: Chen Ping Lu , Xu Jing
Published: December 2012

To reveal the potential and means of energy saving and emission reduction for the parallel pneumatic hybrid vehicle (PHV) proposed in this article, the comparison analysis between parallel PHV and conventional diesel vehicle (CDV) was made on the dive cycles of NEDC, UDDS, HWFET and JAPAN10-15 using the mathematic model. The results show: For the drive cycles of NEDC, UDDS, HWFET and JAPAN10-15, the PHV could decrease emissions by 58.84%, 38.76%, 14.54%, and 66.59% and save energy by 13.12%, 14.06%, -6.27% and 28.06% respectively com-pared to the CDV; Of the five hybrid means of shutting down the ICE at idle, regenerative braking, optimizing working area of ICE, using the exhaust heat of ICE and downsizing ICE, using the ex-haust heat of ICE along with shutting down the ICE at idle have the most impact on energy saving, and then is the downsizing ICE, but using exhaust heat would increase energy consumption; Opti-mizing working area of ICE and shutting down the ICE at idle have the greatest contribution to re-duction emissions, followed is also downsizing ICE. The efficiency of regenerative braking is very low, as well as the heat exchange efficiency of the adopted heat exchanger, requiring further opti-mization and design.
H-Shaped Electrically Resonant Terahertz Metamaterials
Authors: Pan Wu , Li Ting Ting , Li Guo Xin , Huang Shu Lin
Published: December 2012

We designed the H-shaped metamaterial which is used at terahertz frequencies, and it can suppress magnetic response and construct purely electrical resonance. The resonance behaviors and the impact of geometrical parameters of the H-shaped metamaterial were analyzed by using effective circuit model. The simulation results indicate that permittivity of H-shaped metamaterial is negative at terahertz frequencies. H-shaped metamaterial could be used widely in the design of terahertz devices due to its simple structure and easy manufacture.
New Route to Improve Thermal Property of Phenolic Resin
Authors: Cheng Guang Wen
Published: December 2012

A new route for improving the thermal property of phenolic resin was described. Firstly, a soluble preceramic polymer was synthesized by condensation polymerization of zirconium oxychloride, salicyl alcohol and acetylacetone in the presence of triethylamine at room temperature. A modified phenolic resin was then obtained via blending the preceramic polymer and phenolic resin in solution. The preceramic polymer was characterized by FTIR, NMR and GPC. The thermal property of the modified phenolic resin was also investigated by TGA. It was found that the preceramic polymer was composed of Zr-O-Zr as the main chain and the ligands (salicyl alcohol and acetylacetone) as the side chain. It pyrolyzed completely at 600°C and formed ZrO2 in nitrogen atmosphere. The results of TGA indicated that 5 wt% preceramic polymer could increase the thermal decomposition temperature and the char yield of the modified phenolic resin by 18°C and 25%, respectively. Moreover, the preceramic polymer allowed the char formation from phenolic resin at relatively low temperature.
Study on Property of Fe3Al Alloyed by Mn, Cr and V
Authors: Wang Yan Jing , Liu Le , Wang Ji Jie
Published: December 2012

The effects on property of Fe3Al-based alloy adding 1.0at.%Mn,5at.%Cr,0.5at.%V have been studied. Alloys were smelted in a vacuum arc furnace and heat treated in box furnace under atmosphere. The tensile property test and hardness measurement indicate that Cr and V both can improve the room temperature ductility of Fe3Al-based alloy effectively, the effect of micro V to the ductility is correspond to the effect of 5at.%Cr, the Fe3Al alloyed by V has higher tensile strength and yield strength, the effect of 1.0 at.%Mn on the property of alloy is not obvious. The effects of various elements on Fe3Al-based alloy ductility are analyzed according to the electronegativity different of between the three atoms and Fe/Al atoms. Microstructure analysis shows that the reason of V improving the strength is the effect on solution strengthening and the second phase strengthening.
Mix Proportion Design of P (AA-co-MA)/PEG Polycarboxylic Copolymer and High Performance Concrete with Composite Admixture
Authors: Chen Bao Fan
Published: December 2012

This paper sets forth from the effect analysis of the concrete raw materials and all kinds of the performance index tests. It makes further research and exploration of the mix proportion design of P (AA-co-MA)/PEG polycarboxylic copolymer and high performance concrete with composite admixture, combining the mixture of the high performance concrete as well as the performances such as the workability, the hardness of the cement setting and hardening and the endurance quality. It is found that mixing 1.46% P (AA-co-MA)/PEG polycarboxylic copolymer, 15% fly ash and 10% granulated blast furnace slag powder together and adding the mixture into the concrete can not only save the cement but also improve the performance of the concrete. The designed C30 mix propor-tion design of P (AA-co-MA)/PEG polycarboxylic copolymer and high performance concrete with composite admixture has been applied successfully in the high-rise building construction.
The Research of Capacitance Characteristics of MRF
Authors: Wang Song , He Guo Tian , Song Li , Xu Ze Yu , Ran Ying Chun
Published: December 2012

With the development of theory that research on Magneto-Rheological Fluids (MRF), the MRF have been used in many fields in our life. The electrical characteristics of MRF can be widely used in automatic control, medical, automotive, aircraft manufacturing and many other areas .Firstly, this article have derived the formula of MRF between capacitance and Dielectric constant, made the Capacitors which can load the MRF. And then we measure the change of capacitance which is filled with the MRF when the time of magnetic field change, And we also measure the sensitivity of the dielectric constant of different concentrations of MRF as the magnetic field changes. And at last, we have made the curve of the capacitance - magnetic induction intensity the experimental results have been analyzed. We have the conclusion that when the magnetic field increases, the dielectric constant is also increases, resulting in increased capacitance of the conclusions of MRF. Introduction
Study on Mechanical Property of Sic Particulate Reinforced Magnesium Matrix Composites Prepared by Powder Metallurgy
Authors: Liu Jian Xiu , Zhou Ya Jun , Zi Xiao Yang
Published: December 2012

This paper has made a study on Mechanical Property of SiC particulate reinforced Magnesium Matrix Composites prepared by Powder Metallurgy.In this paper, powder metallurgy was adopted in the preparation of AZ91 magnesium alloy and magnesium-base composite material alloying two kinds of SiC particle, whose mean diameters were 18μm and 8μm respectively. The mechanical properties of the sample such as hardness, strength of extension and coefficient of friction were tested, while microstructure of material was observed in electron microscope. At last, analysis of the friction and abrasion mode and tensile break mechanism of the material were carried out. By the series of trials, the following result can be concluded: the additions of SiC particle can decrease theβ-Mg17Al12 mesh effectively while increase the degree of densifying. Comparing with AZ91, the addition of SiC particle of diameter 18μm and 8μm increase the material hardness by 6.85% and 26.92%, strength of extension 29.14% and 71.38% and coefficient of friction 2.33% and 9.62%, respectively. Magnesium matrix composites that prepared by powder metallurgy can be used for the production of friction materials.
First-Order Proportional Modification Parameters for Spiral Bevel Gears Manufactured by Spread Blade Method
Authors: Yu Shui Qin , Wang Zhi Yong , Tang Jian
Published: December 2012

The proportional modification parameters are useful for modifying the tooth form errors of spiral bevel gears. Based on the mathematical model for calculating the machine setting parameters and according to the relative position relationship between cutter and workpiece and the curvature and vector of calculation point, the formulae for calculating the first-order proportional modification parameters for gears machined by spread blade method was deduced. The proportional modification parameters can make the pressure angle or spiral angle of the concave flank and the convex flank produce uniform change and difference change. The formulae is verified by experiment on CNC spiral bevel gear grinding machine and M&M sigma 7 gear measuring center.
Analysis and Simulation on Cutting Morphology of Dry Hobbing
Authors: Zhou J.L. , Xie R.M. , Hu D. , Wu Y.X. , Feng C.F.
Published: December 2012

As the cutting layer shape of hobbing has an important impact on hobbing force, temperature and tool life, this paper put forward the analysis on morphological structure of dry hobbing cutting. The research aim at the morphological shape of cutting layer, in order to give an accurate description, Solidworks is used in the process of cutting simulation and the simulation successfully show the shape of cutting layer. Then the mathematical description is used to plot two kind of geometry trajectory. The first is about the cutting edges project on the cross-section, and another is the interception lines between the cutting edges and the cylinder surface. The analysis showed that the simulation can get ideal cutting layer, and the layer is more intuitional and clear. Meanwhile, compared with the trajectory on radial section, the trajectory on cylinder surface can describe the cutting morphology more accurately and fitter with the real cutting condition.
The Model and Simulation of Magnetorheological Grease Characteristics
Authors: Song Li , He Guo Tian , Zeng Zhi , Ma Yan , Li Ming , Zhang De Sheng , Wang Song , Ran Ying Chun
Published: December 2012

Magneto-rheological grease attracts the attention as a new kind of intelligent material. Under the external magnetic force, it is difficult to use traditional mathematics model to solve and analysis internal structure because of its complexity and polytropy. The modeling and simulation for complex system using computer becomes a good way to investigate complex system. Based on the electromagnetic theory and computer simulation, this paper constructed the model of shear stress to describe the characteristic of magneto-rheological grease that is to use body centered cubic pillars model to analysis the mechanism and characteristics of magneto-rheological grease. Using matlab simulink toolkit to compose the simulation program, simulate and analysis using theoretic model, and plot the shear stress curve of magneto-rheological grease with magnetic strength and particle size, and the shearing force under zero field. The simulation and experimental results indicate that the simulated shear stress curve is coincidence with experimental curve when the density of ferromagnetic particle is low, and it is lower than experimental curve when the density is high (the variation tendency is close), which verified the accuracy of theoretical model. It needs to improve the model by considering the still friction between ferromagnetic particles.
Computer Aided Design Technology in the Application of Modelling Design of Shaft Parts
Authors: Lu Ming
Published: December 2012

This paper describes the application of CAD-aided design technology combined with vb.NET development tools in the design of mechanical parts. To shafting parts design as the example, elaborated AutoCAD development technology in shaft parts of design methods and steps. Used Computer programming software for CAD secondary development to reduce the duplication of work of the designers, improve design accuracy and efficiency.
Seismic Response Analysis of Long Span Cable-Stayed Bridge under Non-Uniform Excitation
Authors: Wang Bao Fu , Feng Zhong Ren , Wang Xiong Jiang , Chen Bai Ben
Published: December 2012

In this paper, non-uniform dynamic analysis of a cable-stayed bridge is carried out using the large mass method. The Ed Yangtze River highway bridge, constructed in Hubei province, is chosen as a numerical example. In the non-uniform dynamic analysis, various wave velocities are used for the travelling ground motion. Displacements and internal forces solutions obtained for the spatially varying ground motions are compared with those of the uniform excitation. It is observed that the velocity of the ground motion greatly influences the response of the bridge and the variability of the ground motions should be included in the time-history analysis of cable-stayed bridges.
Study on the Basic Configurations of Crank-Group Driving Mechanism
Authors: Cao Ju Jiang , Wang Yu Qi
Published: December 2012

On the basis of parallelogram linkage, this paper introduced the working principles of a kind of new transmission mechanism:crank-group driving mechanism, its three basic configurations and their advantages and dis-advantages.
42CrMo Hard Surface Gear Intensity Tests and Modified Parameter Correction
Authors: Li Nai Gen , Xu Nan , Zhang Nian Jun , Zhu Meng Guo
Published: December 2012

Hard surface gears drive is considering mainly how to improve the tooth root bending fatigue strength and wear resistance of the teeth. Based on the analysis of sliding ratio, coincidence degree and the gear tooth root bending fatigue strength, basic parameters of gear can be modified to improve strength. Although these gears must be cut by the standard tools, high strength gears are needed in machinery. In this research, intensity experiments were conducted with 42CrMo modified and standard hard surface gears. Experiment results show that the improvements of 42CrMo gear parameters are effective and teeth strength is improved for the modified parameters of gears.
Weaken Polygon Effect and Improve Chain Drive Performance
Authors: Zhu Xian Hua , Huang Jian Ming
Published: December 2012

analyzes the polygonal effect of the chain drives by analyzing the chain velocity and angular velocity change of driven sprocket. In order to abate polygon effect and improve the performance of chain transmission, advanced production technology should be adopted.
Adaboost-Gaze Based Multi-Stage Object Tracking
Authors: Yang Yu Bin , Gu Jiao Jiao , Zhang Xiao Yu , Liu Zhi
Published: December 2012

Object tracking is a very important application in the fields of computer vision. In practice, automated tracking systems can rarely meet the required performance. This paper improves the attentional based tracking framework with Adaboost and gaze selection. The object classifier is implemented using the ADA Boosting to recognize digits from the MNIST dataset. At the initial object position Gaze selection is performed. The performance of the framework is evaluated using digit videos generated from the MNIST dataset with clutters. In general, the performance of the framework is robust to changes in motion routes and degree of clutter.
MMW Radiometric Image Feature Extraction Method of Concealed Objects Based on Watershed Algorithm
Authors: Wang Qi , Zhang Guang Feng
Published: December 2012

Because of all-time, all-weather ability to work and strong penetration, millimeter-wave radiometer is used to inspect concealed objects hidden under clothing. Due to the restrictions of antenna, equipment and environment, the resolution of image is low and the contours of concealed objects are not clear. To improve the quality of radiometric images and the accuracy of edge detection, we firstly process the image using threshold segmentation, then, a method of combining morphology self-adaptive filter and watershed algorithm is proposed to do the further processing and feature extraction. The experiment results indicate that morphology self-adaptive algorithm and watershed algorithm can complete the edge extraction of the concealed objects well with the real objects.
Noninvasive Heart Rate Variability Detection Device for Fatigue Driving Detection System
Authors: Ye Ning , Sun Yu Ge , Yang Dan
Published: December 2012

Monitor psychological parameters of driver to detect fatigue state is an effective approach to prevent traffic accident. Heart rate variability (HRV) has its particular advantage comparing with other methods, such as its accuracy and conveniences. ECG is a regular signal to obtain HRV, but during driving condition, electrodes and wires need to be placed on driver’s body and may disturb the driver’s normal driving behavior. Since ballistocardiogram (BCG) can reflect heart movement, so HRV can also be extracted from BCG. This paper gives a novel noninvasive method to detect driver’s BCG. Using PVDF sensor which is embedded in safety belt to get driver's BCG and designing hardware and software to amplify and convert it to digital signal for next processing. The result shows that the proposed device can obtain the driver’s BCG properly and the HRV of the driver can be calculated accurately and conveniently, so the design is reasonable.
Study on a Rotary Self-Check Phase Unwrapping Algorithm
Authors: He Guo Tian , Ran Ying Chun , Song Li , Wang Zhong Xun
Published: December 2012

This article presented a rotary self-check phase unwrapping algorithm. The algorithm was mainly to process phase unwrapping for the phase main value got from Interferometer in accurately measuring object surface topography, and then accurately restored the object surface topography. The object surface topography measured by Interferometer generally tended to be smooth, the phase unwrapping was not difficult without noise interference. The algorithm processed phase unwrapping by the path of gradually rotational diffusion from the middle to the around in the wrapped phase map, at the same time the check for the error was carried out. It used the median filter technology to process the phase unwrapping error, and avoided the transmission of phase unwrapping error, had a greater inhibitory effect on the noises. This method did not identify the residuals, had small amount of operations, and Unwrapping velocity was several times faster than the fastest traditional branch blocking algorithm.
The Design and Realization of a Spectrum Acquisition Unit Based on the MSP430F149 MCU
Authors: Song Jun Jun , Ren Bin , Lei Song
Published: December 2012

In the field of satellite communications, spectrum analyzer is one of the primary means of frequency monitoring, and it plays an important role in ensuring communication quality. According to the principle of the superheterodyne spectrum analyzer, the design and realization of a spectrum acquisition unit based on MSP430F149 MCU is given in this paper. Comparing the test results with those of the Agilent N9020 spectrum analyzer, the comparison shows that in the intermediate frequency signal monitoring, the spectrum analyzer designed in this paper has reached the current performance level of the mainstream spectrum analyzer.
Simulation of the Space Turntable Angular Velocity Measurement
Authors: Cui Kai , Liu Zhao Hui , Li Zhi Guo , Yuan Hui , Liang Dong Sheng
Published: December 2012

For better design and control of the space turntable, a model for measuring its angular velocity was built. The model utilized a two-axis space turntable to perform the simulation basing on the coordinate conversion theory. The measuring simulation went on with the help of MATLAB software using different carrier attitude angles. It shows the maximal error in the sub astral point longitude and/or latitude is 0.00785 degrees when comparing with the STK results, certifying the validity of the models. The satellite attitude angles have influence on the angular velocity, the maximal azimuth angular velocity is 3.784 deg per sec, yet the elevation's is 0.6945 deg per sec when the attitude angles are all 20 degrees. This simulation process provides some guidance for designing, controlling and calibrating the space turntable.