bluuebunny/crossref_metadata_2025 huggingface dataset:
Establishment Methods of Constitutive Equation for Metal Plastic Forming
Authors: Wang Ning Hua , Yang Lian Fa , He Yu Lin
Published: November 2013

Constitutive equation for metal plastic forming reflects the relationships among the parameters of stress, strain and strain rate. The accuracy of constitutive equation is a key factor in the research of material mechanism, finite element simulation accuracy and forming failure. The commonly used establishment methods of constitutive equation are summarized. Those methods include experiment method, theory analysis method, neural network method, regression method and inverse finite element method. The advantages and disadvantages of those methods are discussed, and application scope of those methods is summarized simultaneously.
Spontaneous Emission of a Two-Level Atom in Chiral Photonic Structures
Authors: Akıncı Nurgül
Published: November 2013

The spontaneous emission spectrum of a two-level atom in a one-dimensional (1D) anisotropic photonic crystal with symmetry of double helix is investigated using Laplace transform. Properties of spectrum of the radiation modes are discussed in detail under different values of detuning of atomic resonant frequency from a band-edge. Since spontaneous emission is proportional to the density of states (DOS), it is suppressed within the reflection band, corresponding to vanishing of the DOS. However, it is enhanced at the band edge. Therefore, spontaneous emission spectrum of the system is influenced at the edge of the stop band rather than at its centre.
The Development of 14.5Tex Eri-Silk/Bamboo Fiber 65/35 Blended Yarn for Knitting
Authors: Wang Wen Zhong , Fan Li Shan , Du Mei , Zhao Lei , Zhu Ting
Published: November 2013

In order to develope the eri-silk/bamboo fiber blended yarn for knitting, the authors analyze the main qualities of eri-silk and bamboo pulp, explain the method of pre-processing the eri-silk stapes in detail and the spinning technique of the eri-silki staple and bamboo pulp fiber blended yarn. Various measures are taken to deal with the problems such as the smooth surface, weak cohesive force, too much yarn hairness. This kind of new yarn has a good prospect. It can further improve the technique, improve the yarn strength and production effectiveness, lower the cost and better satisfy the consumers.
The Study on Eri-Silk Degumming Process Optimization and its Properties
Authors: Wang Wen Zhong , Zhao Lei , Fan Li Shan
Published: November 2013

Study the influence of eri-silk degumming process for degumming results of 2709 alkaline protease; combined with the orthogonal experimental analysis of high degumming rate and breaking strength of the best eri-silk degumming process, and then compare the optimized extracted eri-silk with mulberry silk, virgin silk, cotton, wool and ramie fibers for their fineness, mechanical properties, and friction performance comparison. The results show that the 2709 alkaline protease can effectively remove silkgum, and that the amount of enzyme is the main factor affecting degumming rate; pH value is the main factors for the breaking strength. Comparing with other fibers, eri-silks average fineness is smaller, breaking strength and initial modulus tend to be larger, but their coefficient of variation also tend to be larger. Besides, eri-silkis breaking elongation is not as good as wool and silk, but better than other fibers. Natural silks dynamic and static coefficient of tangential impedance is lower in comparison with other natural fibers. Ramie has the largest tangential resistance factor. Among the natural silks, the eri-silks tangential impedance coefficient is greater than tussah and smaller than mulberry silk.
Electrochemical Behavior of 430 Ferritic Stainless Steel in HCl Solution at Different Temperatures
Authors: Shi Pei Yang , Li Xiao Liang , Yue Ying Ying , Liu Cheng Jun , Jiang Mao Fa
Published: November 2013

The environmental concerns brought during pickling process of stainless steel in HNO3-containing acids need urgent attention. Choosing the hydrochloric acid pickling process as study object, this paper conducted a systematic study of the effect of temperature on the electrochemical behavior of stainless steel in hydrochloric acid solution. Research indicated that as temperature rose, the corrosion potential of 430SS in hydrochloric acid solution moved to positive direction with band to a narrow 0.1V. Meanwhile, the current intensity increased which indicated the acceleration of corrosion rate. In addition, the anode Tafel slope increased firstly and decreased later while the cathode Tafel slope increased slightly.
Simulation of Thermal and Mechanical Response of (Zr,W)B2 Ceramic after Oxidation
Authors: Wei Jun , Dehdashti Maryam K. , Dharani Lokeswarappa R. , Chandrashekhara K. , Hilmas Gregory E. , Fahrenholtz William G.
Published: November 2013

This study relates to a micromechanics based finite element model of the effect of oxidation on heat transfer and mechanical behavior of a (Zr,W)B2ceramic at high temperature. An adaptive remeshing technique is employed in both heat transfer and thermal stress analysis models. A global-local modeling technique is used to combine finite elements with infinite elements for thermal stress analysis. Temperature and thermal stress distributions in the ceramic and the oxides are presented.
Research Progress of Sawing Mechanism for Free Abrasive Wire Saw
Authors: Wang Jin Sheng , Wang Chao , Li Zi Fa
Published: November 2013

The wire saw for slicing wafers process is free abrasive machining process. In this paper, we summarize the sawing mechanism for free abrasive wire saw, and think that the sawing mechanism is mainly rolling-indenting removal. But there are two forms of the force which causing the abrasives to roll and indent in the workpiece surface, one form the force acts on the abrasives by shear stress and hydrodynamic pressure, another form the force acts on the abrasives by wire saw. We design an experiment to verify the form of the force, and think that the second form of the force mainly causes the abrasive to roll and indent in the workpiece surface.
The Structural Analysis of the Different Forms of the Wind Turbine Spread Foundation under Extreme Loads
Authors: Chen Chi , Li Jia Yuan , Hu Liang
Published: November 2013

This paper based on the same wind conditions and geological data, and use the CFD software to established the square and round expansion foundation that satisfy the condition under Extreme Loads, and then analysis and comparison the calculation results of the two kinds of foundation. Compared and analyzed the amount of concrete, base pressure, subsidence, the crack width, tilt rate against overturning, skid safety factor and so on, to find out the pros and cons of the structure and provide a reference for the choice of the wind turbine foundation under the corresponding geological conditions.
Out-of-the-Lifting-Plane Stability Analysis of Crane Telescopic Boom with Cable Exerted at the Top
Authors: Lu Nian Li , Du Liang , Liu Shi Ming , Xue Yuan
Published: November 2013

To enhance the carrying capacity of the crane variable cross-section telescopic boom, the usual practice is using the cable at its top end, it makes the out-of-the-lifting plane stability problem of crane telescopic boom become solving the Euler critical force with follower force. This paper established the deflection differential equations of crane telescopic boom model which under actions of cable, with proper boundary conditions, the recurrence formula of buckling characteristic equations were presented, and some practical applications were given. The influence on buckling critical force of crane boom due to the ratio of the length of cable and crane boom was discussed. Took certain four-sectioned telescopic boom as example, the destabilizing critical force was calculated, the result showed that in comparison with the ANSYS method, the buckling characteristic equations in this paper is completely correct.
Transient Pressure Analysis of Wells Intercepted by Partially Penetrating Finite Conductivity Hydraulic Fractures
Authors: Lu De Tang , Xie Qing , Niu Cong , Wang Lei
Published: November 2013

Most current pressure transient analysis techniques of hydraulically fractured wells are based on the fully penetrating assumption, which assumes equal thickness of hydraulic fracture and the formation. However, field application show that the fractures thickness can be shorter than the thickness of formation, which leads to vertical flow into the fracture. Thus applying the thickness equality assumption of current well test models to a partial penetrating fracture may give contradictory result. Further, there are very few studies concerning pressure transient analysis of partial penetrated wells. So it is important to develop analysis model and procedure to this type of fracture. In this paper, we presented an analytical model for partially penetrating hydraulic fracture in isotropic systems, along with the assumption that fracture is finite conductive. This model is then applied in the analysis of field production data, which verified validity of this new model.
Research on the Inspection Information Extraction from 3D Models of Sheet Metal Parts by the Photoelectric Equipments
Authors: Zhao Li Wei , Wang Dong , Hao Bo , He Li
Published: November 2013

The short comings and limitations of traditional inspection method of sheet metal parts were described in this paper. Aiming at the inspection method based on the 3D models of sheet metal parts, the method of the inspection information extraction was introduced also. The actual shape of the sheet metal was obtained by the portable photoelectric equipments and then the 3D model was formed. The inspection information was extracted from the 3D model by the system which developed by VC++ tools on the CATIA platform. The characteristics of this method are high accuracy, environmental protection and high efficiency.
Uncontrolled Generation of Synchronous Traction Motors in EV/HEV/PHEV
Authors: Ding Xiao Feng , Li Zhen
Published: November 2013

Interior permanent magnet synchronous motor (IPMSM) systems are vulnerable to uncontrolled generation (UCG) when the inverter switches loss their drive signals suddenly during flied weakening high speed operation. At this point, uncontrolled rectifier is composed by freewheel diodes in the inverter, the current comes from the motor through the rectifier, and then charges the battery. This paper develops a simple analytical model of this system firstly, and then carries out the simulation of UCG transient process to investigate the impact of the motor speed, battery capacity and other factors on UCG and feedback-power obtained throughout the process. Moreover, circuit improvement is presented in order to avoid destruction risk of the battery, motor, inverter and other relevant components during UCG.
Thermal Characteristics Analysis of Mill Head of Five-Axis CNC Mill Machine Based on Finite Element Method
Authors: Sun Yong Hou , Xiao Wei , Hu Ru Kai , Huang Mei Fa
Published: November 2013

Machine tool is the foundation of manufacture，then, five-axis CNC machine is the sophisticated equipment of CNC machine. During the practical work，there is an thermal deformation in a CNC machine because of many kinds of heat sources . This deformation affects the relative displacement between the work piece and the cutter, caused the manufacturing errors, and influences the machining accuracy of the part. So is of great importance to research the thermal characteristics. In this paper, thermal characteristics of CNC milling machine are simulated by analyzing the thermal boundary condition and using the finite element software-ANASYS Workbench. Get the temperature field cloud picture of A/C axes bi-rotary mill head of five-axis CNC machine. Weakness of Thermal Characteristics will be found out. This research provides the theoretical fundamentals for improving the accuracy of the mill head.
Design Optimization of Mini Multi-Nut Post Harvesting Machine
Authors: Shinde Gopal U. , Biradar S.K. , Yadav Geeta , Sethi Pradeep
Published: November 2013

The traditional method and mechanisms used for dehulling, cracking, shelling, squeezing or pressing of nuts in the post harvesting operation, is constrained to single platform with multi-operational facilities due to the oil splash ,wound making, poisonous material causing a health hazards hence the vertical cut plane with easy exchange facility by chuck mechanism for cutting tool as well as fixture for material for minimum throughput time and human comfort has been considered in the new design called Multi-Nut dehulling machine. The average product material efficiency was 85.29%, mechanical damage was 14.71% out of 100% shelling and the throughput capacity was 0.60 kg/hr for marking nut. This performance was better than the traditional dehulling, notch and curved blade type dehulling. Splashing of the BSL in marking nut dehulling with multi nut dehuller was observed negligible. The Product material efficiency 72.23% , mechanical damage 27.77% and the throughput capacity was 2.48 Kg/hr for walnut. Machine can cut areca nut 1 kg /hr of the size 10-15 mm.
Design of a Globally and Exponentially Convergent State Observer and its Application to a Mechanical System with Coulomb Friction
Authors: Kim Ho Chan , Chang Dong Eui , Song Seong Ho
Published: November 2013

We show that there always exists a globally and exponentially convergent state-observer for a class of nonlinear systems with nonlinearities that need not satisfy locally Lipschitz condition. So it can be applied to a mechanical system with discontinuous nonlinearities such as Coulomb friction. We not only provide a rigorous proof of convergence of our proposed observer but also how to systematically design it. Through simulation results, the validity of the proposed observer is verified.
Effect of Dispersed Phase Viscosity on Emulsification in Turbulence Flow
Authors: Liu Chen Wei , Li Ming Zhong
Published: November 2013

Systematic experimental study has been performed to examine the effects of dispersed phase viscosity on emulsification in turbulence flow. It is found that the volume drop size distributions widen as dispersed phase viscosity increased; at lower dispersed phase viscosity, both Sauter mean diameter and the maximum stable diameter increase with the viscosity, while at higher dispersed phase viscosity, Sauter mean diameter and the maximum stable diameter decreasing and increasing, respectively. It has also been found that linear relation between the Sauter mean diameter and the maximum stable drop diameter is still valid for the emulsions which show a bimodal volume distribution, and the proportional constant decreases as dispersed phase viscosity increases.
Optimizing Leading Edge Structure for Aerosol Sampling Diffuser
Authors: Wang Bao Qing , Yao Shu , Wang Ze Bei , Yang Wen , Bai Zhi Peng
Published: November 2013

A diffuser leading edge has been designed for aircraft aerosol sampling. The diffuser leading edge fluid was conducted using the CFD. The diffuser inlet, middle and outlet diameter is 35.3, 100 and 35.3 mm, respectively. The angle of the diffuser inlet and outlet is 4°. The diffuser inlet and outlet with leading edge have achieved isokinetic sampling, and have stable flow and pressure distribution. It is suggested that CFD simulation can be useful for improving the optimum the diffuser.
Welding Performance of a Homemade Friction Stir Welding Tool
Authors: Hilmy Irfan , Adesta Erry Yulian T.
Published: November 2013

Homemade Friction Stir Welding (FSW) Tool utilizing conventional milling machine has been developed. The FSW tool made from mild steel was designed and fabricated. Experimental investigation of FSW process of the Aluminum alloy specimens to observe its mechanical performances was performed. To evaluate its performance, hardness test, tensile test as well as visual inspections of the welding result were performed. Hardness number in the welding region was measured about 40-60% lower than the base metal, and heat affected zone region. The tensile test result varies with maximum 100 MPa. The imperfection of final form of metal due to the stirring mechanism was inspected. The presence of void/crack at cross-section of the welded specimen was observed. It was found that by applying suitable configuration, the use of mild steel as the FSW tool was reasonable for performing FSW process. It was concluded that, using a relatively low cost FSW tool, a quite satisfactory result of welding performance was achieved.
Analysis and Calculation of Electromagnetic Torque for the Voltage Source Traction Motors
Authors: Wu Xiao Yu , Chen Zhe Ming , Huang Ze Hao
Published: November 2013

The traction motor installed on the high-speed train is powered by inverter. A large number of harmonics may appear when motor is operating. Then the motor speed generate oscillation and finally the dynamic characteristic is affected in vehicle system. In this paper, relied on the electromagnetism of traction motor, the mechanism about emerging harmonic torque is analyzed. In addition, based on the equivalent circuit, the method of calculating the parameters in harmonic circuit is proposed. Two mathematical formulas are also proposed to obtain the fundamental electromagnetic torque and the harmonic electromagnetic torque on traction motor. The time domain and frequency domain distributions of the torques are gained and analyzed. Finally a calculation example of traction motor harmonic torque was analyzed and calculated, and prepared for further study of harmonic torque impacting on vehicle system dynamic performance.
Structure and Magnetic Properties of Ga Substituted Ni-Ferrites
Authors: Amirabadizadeh Ahmad , Larimi Zobedeh Momeni , Eghbali Saeideh
Published: November 2013

Nanocrystalline Ga doped nickel ferrite [(NiFe2-xGaxO4 (x=0.0, 0.1, 0.3, 0.5 and 0.7)] powders have been synthesized by sol-gel auto-ignition method and the effect of non-magnetic gadillum content on the nanosize particles and magnetic properties has been studied. The X-ray diffraction (XRD) revealed that the powders obtained are single phase with spinel structure. The calculated grain size from XRD data have been verified using transmission electron microscopy (TEM). TEM photograph shows that the powders consist of nanometer sized grain. The size of nanoparticles decreases as the non magnetic Ga content increases. Magnetic hysteresis loops were measured at room temperature with maximum applied magnetic field of 20 KOe. As Ga content increases, the measured magnetic hysteresis curves became border and saturation magnetization (MS) increased up to x= 0.3 and further increase of x leads the magnetization to decrease. The results are explained according to the assumed cation distribution.
Decentralized Fusion Filtering with Different Sensor Memories in Dynamics System with Uncertainties
Authors: Song Il Young , Huh Seongdo , Shin Vladimir
Published: November 2013

This paper is concerned with the decentralized sliding window Kalman filter for multisensor discrete-time dynamic linear systems having different sensor memories. The proposed filtering is presented that combines the Kalman filter and sliding window strategy. A decentralized fusion with the weighted sum structure is applied to the local sliding window Kalman filters (LSWKFs) having different sensor memory size. The proposed decentralized algorithm has a parallel structure and allows parallel processing of observations, thereby it more reliable than the centralized version if some sensors become faulty. Moreover, the choice of sliding window strategy makes the proposed algorithm robust against dynamic model uncertainties. The derivation of the error cross-covariances between the LSWKFs is the key idea of this paper. The application of the proposed decentralized filer to linear discrete-time dynamic systems within a multisensor environment demonstrates its high accuracy and computational efficiency.
Optimization of Multi-Pole Three Phase Permanent Magnet Synchronous Generator for Low Speed Vertical Axis Wind Turbine
Authors: Khan M. Shahrukh Adnan , Rajkumar Rajprasad K. , Rajkumar Rajparthiban K. , Aravind C.V.
Published: November 2013

This paper focuses on developing an optimal system of Vertical Axis Wind Turbine (VAWT) for low wind speed. After studying the performance analysis of the turbine parameters for speeds less than 5 m/s, a realistic model was designed in Matlab/ Simulink that could produce suitable torque for low wind condition. The Multi-pole Axial Flux Permanent Magnet Synchronous Generator (PMSG) had been proven to be a good choice for this optimal design as it performed well enough to generate sufficient amount of voltage and power. The turbine design parameters such as the radius, height and wind speed were varied to observe the change in generator output voltage and power and based on that an optimal design for Permanent Magnet Synchronous Generator was proposed in this paper. The simulation results were tested with an actual Permanent Magnet Synchronous Generator in laboratory applying the optimized turbine parameters and were compared accordingly for error calculation. Lastly, future possibility of improvement and the limitations had been proposed to develop the system further.
Vibration Characteristics Analysis of Wind Turbine Towers under Foundation Conditions
Authors: Song Xi , Wu Yin Guang , Li Jie Yu , Zhao Rong Zhen
Published: November 2013

Based on a kind of 1.5MW large-scale horizontal axis wind turbine tower, the mechanical modeling of a wind turbine tower-foundation is established, the static and dynamic analysis of the model is carried out by ANSYS software. The top displacement of the system is calculated by the static analysis to meet the design requirements in engineering. In dynamic analysis, each pile foundation is equivalent to a group of springs for the simulation of horizontal and vertical rigidity of the pile. The influence of top mass and foundation elasticity on wind turbine tower modes is analyzed, and calculated the natural frequency of the tower within a certain scope of rigidity in different directions about the piles foundation. The results show that the natural frequency of the wind turbine tower is influenced significantly by the mass on the tower top and foundation rigidity. The study provides a theoretical basis for optimal design of the wind turbine.
Solid Oxide Fuel Cell and Steam Reformer System Steady State Modeling
Authors: Srisiriwat Nawadee , Wutthithanyawat Chananchai
Published: November 2013

A solid oxide fuel cell (SOFC) is widely recognized to be an attractive energy conversion device owing to its fuel flexibility and high efficiency. Hydrogen-rich stream produced by fuel processor, especially steam reforming process, is used as fuel carrier converting to generate electrical energy. This paper presents a steady state modeling of SOFC system with an integrated steam reformer fueled by ethanol. The main objective of this study is to analyze the steady state characteristics of this system. The basic operating principle of SOFC is briefly introduced and the steam reformer converting ethanol as the fuel source into hydrogen-rich gas is also discussed. Based on thermodynamic analysis, the equilibrium compositions of produced gas fed into SOFC can be predicted by using the method of Gibbs free energy minimization. The effects of main operating parameters of steam reformer including the temperature and water-to-ethanol molar ratio on the SOFC power generation are investigated. In the SOFC operation, an increase of SOFC temperature causes a decrease of cell voltage and an increase of excess air entering a fuel cell to maintain the adiabatic temperature of SOFC stack. The steady state conditions for the SOFC and ethanol steam reformer systems are summarized in this paper as well.
A Formation System of Large-Capacity Power Li-Ion Battery
Authors: Wu Lai Jie , Huang Liang , Ma Bin , Li Xue Bing
Published: November 2013

This paper designed a large-capacity Li-ion battery formation system, and illustrated its composition and working principle. The formation system uses a programmable voltage-limiting and constant-current control circuit with voltage-limiting protection function to prevent Li-ion battery over-charge and over-discharge. The system consists of a upper computer (server) and a number of lower computers (formation units) linked with 485 bus. The server can monitor formation process and record formation data in real-time. By testing, the system has good characteristics, such as large charge and discharge current, high control accuracy, multiple-step programming, etc., and it can meet the needs of a large-scale power Li-ion battery formation.
The Study of Electron Energy Loss Spectroscopy of Ni-4.8at%Ti Alloy
Authors: Yang Wei Guo , Li De Hui , Cai Hong Jin , Cai Xin , Chen Huan , Xiang Hong Fu , Wei Fan Song
Published: November 2013

An Ni-4.8at%Ti alloy was prepared and the electron energy loss spectroscopy (EELS) of nickel was collected. Thed-electron occupancy of Ni is measured from the white-line intensity of EELS. It was found that relative to pure Ni thed-electron occupancy of Ni in Ni-4.8at%Ti alloy did not change significantly.
Equivalent Enthalpy Drop Method with Application in a 330 Mw Double Pumping Cogeneration Unit and its Thermal Characteristics Analysis
Authors: Zhu Yu , Li Qian Jun , Zheng Li Kun , Fang Yong Xin
Published: November 2013

It is quite convenient and flexible to adopt the equivalent enthalpy drop method, in order to analyze a thermal system. In this report, a 330MW cogeneration unit will be chosen, as a case in point, to provide quantitative calculation and qualitative analysis in both global and local aspects. According to our research, this cogeneration unit is designed to operate in a double pumping status. It has such properties as follows: Under 85%BMCR double pumping condition, its highest efficiency of power generation is obtained. In pure condensing conditions with around 70% load, the steam consumption rate reaches minimal level. The reason for this phenomenon lies in the maximal net equivalent enthalpy drop of new steam, although with 70% load, the power generation efficiency is much lower than that in rated pure condensing conditions.
Research on the On-Line Monitoring System for Winding Deformation of Distribution Transformers Based on FRA
Authors: Zhang Zhong Yuan , Chen Tao , Wang Yan Bo
Published: November 2013

Distribution transformer constitutes a significant asset for any distribution power system. Short circuit currents or forces can cause mechanical faults in transformer winding. In order to discover the hidden trouble of the transformer, in this paper, on-line monitoring system based on FRA method is developed, and signal source, signal injection, system software are introduced. Furthermore, a nanosecond impulse signal generator is used to inject impulse signals through a noninvasive capacitive sensor, to realize on-line monitoring for winding deformation of distribution transformer. Finally, the monitoring system is validated by a corresponding experimental study.
Homogeneous Deposition Precipitation Method for Synthesis of Carbon Nanofibre Based Cu-ZrO2 Catalyst for Hydrogenation of CO2 to Methanol
Authors: Ud Din Israf , Shaharun Maizatul S. , Subbarao Duvvuri , Naeem A.
Published: November 2013

Deposition precipitation method was employed to synthesize carbon nanofiber based Cu-ZrO2catalyst (Cu-ZrO2/CNF). Carbon nanofibre of herringbone type was used as a catalyst support. Prior deposition of catalyst particles, carbon nanofibre was oxidized to (CNF-O) with nitric acid solution. Catalyst was characterized by X-ray diffraction (XRD), Fourier Transmission Infrared (FTIR), Transmission Electron Microscopy (TEM) and Temperature-Programmed Reduction (TPR). Highly loaded, well-dispersed and thermally stable catalyst particles with average size of 4 nm were obtained by deposition precipitation method. Reaction studies confirmed the activity of the catalyst towards methanol formation.
Modelling Interconnection of Future Combustion Engine Power Plants with Traditional Grid
Authors: Murtaza Hashmi , Raili Alanen , Seppo Hänninen
Published: November 2013

In this paper, a new simulation model is developed to be able to simulate diesel genset smart grid interconnection by keeping in view future requirements of the grids and grid codes. The simulations are carried out in Matlab/Simulink environment. An example case is based on 1200 kW variable speed diesel genset with permanent magnet synchronous generator (PMSG). The simulations are carried out for various dynamic behaviours of PMSG and their protection and control facilities, which are necessary in normal operating conditions and in a range of disturbed operating conditions in order to preserve or to re-establish system security. Various faults (e.g. disturbances) have been induced in the distribution system and the robustness of the network has been analysed to make sure continuous supply of electricity to the consumers in the future smart grid environment.
A CRLH TL Transmission Line Structure and its Application to Bandpass Filter Design
Authors: Guan Ya Lin , Tang Xin Kun , Zhou Shi Lei
Published: November 2013

In this paper, a novel bandpass filter (BPF) using the composite right/left-handed transmission line (CRLH-TL) theory is presented.The composite right/left-handed TL with the high-pass characters of left-handed transmission line (LH-TL) and the low-pass characters of right-handed transmission line (RH-TL) are used to construct the bandpass filter.Using this theory,we design a bandpass filter which have an obvious band pass response with a wide passband range from 5.1to 12.9GHz and a low insertion loss of less than 3.1dB. The relative bandwidth is close to 110%. Simulation using ADS demonstrated the viability of the approach.
Design of Solar Collector Tubes Thermal Performance Parameters Detection Device on Embedded Linux
Authors: Wen Ming Yang , Qi Shi Qing , Chen Ning Ning
Published: November 2013

This paper illustrates detection principle and detection method of thermal performance parameter of solar collector tubes, design a device to detect thermal performance parameter of solar collector tubes. This device adopts S3C2440 microprocessor which is developed with ARM920T core and embedded Linux system as hardware platform and develops the application program. This device could achieve real-time multitasking function detection of the thermal performance parameter of solar collector tubes, at the same time the device will transfer the data to computer via LAN communication. Due to the application of ARM and embedded Linux system make the intellectualized degree and operating speed of the device improved greatly, while it can realize real-time multitasking function.
A Robust True-Color Watermarking Scheme Based on Discrete Cosine Transform
Authors: Niu Chun Hui , Lv Yong
Published: November 2013

A watermarking technique for true-color image based on double random phase encryption method and digital holography is proposed. Three different watermark images are encrypted into three holograms, respectively. Then, three holograms are hiding into a true-color image. Watermark extract method has also been described detailedly. Simulation Results indicate that our proposed watermarking technique can resist physical attack well and has a high security degree of hidden information.
Mining Heat Stress Induced Genes Encoding Heat Shock Proteins (HSPs) and Heat Stress Transcription Factors (HSFs) in Strawberry (Fragaria x ananassa)
Authors: Lin Lee Fong , Liao Shih Yi , Yen Jui Hung , Chiou Shu Jiau , Lee Cheng Yu , Chou Ming Lun
Published: November 2013

Plants have developed a variety of responses to extreme temperature situation in order to minimize damage and maintain cellular homeostasis. Recent research has revealed the involvement of heat stress proteins in thermotolerance inArabidopsis. However, it is still obscure in strawberry plants. To identify heat stress responsive genes in strawberry (Fragariaxananassa), we constructed a Transcriptome for strawberry and it was compared to Unigene annotated in several available proteomics, including Nr, COG, KEGC, and Swissport. Nineteen candidates with complete open reading frame (ORF) of 191 predicted genes encoding HSPs or HSFs were further analyzed. RT-PCR assays and heat stress induction analysis for these potential HSPs and HSFs were performed. Our data demonstrate that the prediction of potential heat stress responsive genes from our created Transcriptome for HSPs and HSFs, respectively, correlates well with the subsequent experimental results, indicating the Transcriptome we constructed could be translated into other scientific use.
A Target Location Algorithm Based on Image Registration
Authors: Shi Zhang Song , Dong Yin Wen
Published: November 2013

In order to realize shore-based target precision strike for the big caliber naval gun weapon, and resolve the problem about target location using by image information, a target location algorithm based on image registration is proposed. Firstly, the SURF features of target image and satellite image are extracted, and matched feature point pairs are obtained by the nearest neighbor role. Secondly, transformation parameters are estimated by RANSAC algorithm to achieve image registration, and the position information of target is obtained. Finally, the targets position parameters relative to the ship are calculated by Bowring formula. Experiment showed this algorithm could achieve target location accurately.
Analysis of Incremental Measurement of the Arm Position with Actuator
Authors: Krehel' Radoslav , Rimár Miroslav
Published: November 2013

The article contains information about the function and basic properties of the actuator based on pneumatic artificial muscles. The article presents the measurement results of the response of the actuator arm displacement depending on the input pulse. This dependence enables artificial muscles to be better adjusted to the needs of a practical operation, especially in terms of lagging. The article also included calculations of velocity and acceleration of individual time intervals. For the possibility of simulation application, a mathematical model of the approximation curve of the response development is presented.
Proposal of Linear Drive for Mechatronic Facility of Solar Panels
Authors: Rimár Miroslav , Kuna Štefan , Čorný Ivan
Published: November 2013

The paper deals with proposal of synthesis of drive control of solar panels facility. New way of facility control is presented. The facility serves for solar panels rotation according to sun radiation intensity, sun location, and feedback control of position of linear electric drive.
Mathematical Description and Static Characteristics of the Spring Actuator with Pneumatic Artificial Muscle
Authors: Vagaská Alena
Published: November 2013

The article is focused on the actuator with one pneumatic artificial muscle and spring which counteracts the tensile force of the artificial muscle. Such a solution requires only one inlet and one outlet electromechanical pneumatic valve. It is suitable for the synthesis of so-called low cost bioservosystems. The paper presents mathematical description and static characteristics of individual parts of the actuator and also characteristics of the all mechanism.
Present Trends in Designing of Technical Systems
Authors: Šeminský Jaroslav
Published: November 2013

Paper is focused to the development in designing of technical systems and present methodology approaches. For a long time, engineering design research has been focused on the development of various design theories, methodologies, methods, tools, and procedures. Engineers to more efficiently design artefacts have subsequently used that design methods. However, as the artefacts have grown in complexity, the need for new methods has become obvious. Also, in a nowadays world, increased competition and globalisation require organizations to re-examine traditional product development strategies. While the difficulties in design synthesis are caused by a wide variety of issues, the complicatedness under problem size is so essential that it make procedural design knowledge insufficient to generate superior design solutions.
Modelling of Selected Reliability Indicators of Prototype PAM Equipment
Authors: Straka Ľuboslav , Fabian Stanislav
Published: November 2013

The aim of the contribution is to describe modelling of selected reliability indicators of prototype equipment with PAM. Purpose of model is maximizing overall equipment reliability by the means of optimal selection of basic elements or by proper redundancy of the elements. Further, possibilities of reliability increase by the means of active and passive reserve are described, as a higher level of reliability control in given technical equipment with PAM. Summary of particular ways of reliability increase is presented on an example of a given prototype mechatronic equipment based on artificial muscle.
Impact of an Excessive Wear of Bearing on the Mechatronic Devices
Authors: Čačko Peter , Krenický Tibor , Dobránsky Jozef
Published: November 2013

The article studies, based on the evaluation of the experimental research, effectiveness of independent and combined interaction of selected methods when diagnosing bearing of the mechatronic device in course of 6 months. During this time the general overhaul of the device was carried out, where the measurements, analyses and evaluations were focused on run-in and a shorter after run-in period of the bearing.
The Magnetic Separation Study on Flotation Concentrate Powder of Magnesite Ore
Authors: Wang Qian Qian , Wei De Zhou , Li Xiao An , Dai Shu Juan
Published: November 2013

Iron in magnesite concentrate powder would seriously endanger the quality of refractories. Slon-500 vertical ring pulsating and high gradient magnetic separator and CRIMM DCJB70-200 laboratory electromagnetic splint VPHGMS were used to remove iron from magnesite flotation concentrate powder produced in Haicheng region. The magnetic separation results showed that using CRIMM DCJB70-200 laboratory electromagnetic splint VPHGMS is more suitable, and the most suitable operating conditions is the background field strength 641kA / m and bar spacing 2mm, at which time the magnesite concentrate yield was 91.25%, and the Fe2O3 content was 0.34%.
The Effect of Bauxite Moisture on High Pressure Grinding Roller Crushing
Authors: Chen Jun Tao , Yang Lu , Zhang Qiang Long
Published: November 2013

The crushing tests of different moisture content bauxite were made by using laboratory high pressure grinding roller. The results showed that, high pressure grinding roller capacity had little effect and favourable to crushing when bauxite contained some moisture, and high pressure grinding roller capacity reduced significantly and high pressure grinding roller crushing result effected deeply when bauxite moisture content was more than 7 %.
The Effect of High Pressure Grinding Roller Working Pressure on Bauxite Crushing Effect
Authors: Chen Jun Tao , Zhang Qiang Long , Yang Lu
Published: November 2013

Through Changing Working Pressure, the Crushing Tests of Bauxite were Made by Using Laboratory High Pressure Grinding Roller. the Results Indicated that, with Working Pressure Increased, High Pressure Grinding Roller Capacity First Increased and then Decreased. High Pressure Grinding Roller Capacity Reached Maximum when Working Pressure was 9 Mpa, and Reduced Deeply and then Gradually Slowed down when Working Pressure was more than 11 Mpa. the Particle Size of Bauxite Crushing Product P80 Gradually Reduced when Working Pressure Increased from 7 Mpa to 15 Mpa, and Gradually Increased when Working Pressure was more than 15 Mpa. the Working Pressure of 11 Mpa was Appropriate when Bauxite Crushed by Laboratory High Pressure Grinding Roller.
Effects of Photocatalytic Activity of Iron Doped on TiO2 Films Using Microarc Oxidation
Authors: Su Hui Dong , Sun Fu Jia , Zhang Hui
Published: November 2013

Titanium oxide films were formed on the titanium surface by micro-arc oxidation (MAO) in Na3PO4 solution. Then the titanium oxide films were soaked by Fe (NO3)3 aqueous and calcined to improve the activity. The photocatalytic ability of titanium oxide films before and after surface treatment was evaluated by Rhodamine B aqueous solution. The results show that the photocatalytic degradation rate of titanium oxide films is low. After the surface treatment, the iron ion was doped on the titanium oxide films. It was found that the photocatalytic activity of the titanium oxide coatings was enhanced after Iron doped. The photocatalytic decoloration rate was increased from 15.1 % to 42 %.
Laboratorial Research for Low Cost Preparation of Nano Grade Tungsten Disulfide Particles
Authors: Mao Yan , Shi Chen , Chen Chen Bing , Mao Da Heng , Liu Shao Jun
Published: November 2013

Developed a kind of ball milling device under ultrasonic energy field, which prepared out WS2 particles with average particle size 59 nm, among which 85 percent particles are less than 100 nm. Get a group of suitable technical parameters, through contrastive experiments to milling time, milling balls size, mixing round speed, material plasma thickness, balls and material ratio and suchlike factors effect on powder preparation. The experiments result shows: effect of the experiment of balls milling with ultrasonic field is greatly better than that of the experiment balls milling without supersonic field; Furthers, inclined arrangement of ultrasonic breadth modulation bars gets better particles than vertical arrangement ultrasonic. This preparation method can get well and stable refining output with several times higher efficiency than other processing methods and then can meet the demands of nanograde WS2 lot preparation in low cost.
Preconcentration and Separation Capabilities of the Modified Bentonite Using Dithizone for Trace Cobalt in Water
Authors: Song En Jun
Published: November 2013

In this paper, a new method for the preconcentration and separation of cobalt was described. The methodology combines determined using an atomic absorption spectrometry (FAAS) with adsorption and desorption of cobalt on the modified bentonite using dithizone (Bent-dithizone). The operation conditions for the pre-concentration and separation of the cobalt, including pH, contact time, eluent condition and co-existing ions have been investigated. The result showed that the cobalt ion could be adsorbed by Bent-dithizone. The adsorption quantity was affected by the pH value of medium and shaking time. In the medium of pH 6.0, the adsorption capacity of Bent-dithizone to cobalt ion was 18.12 mg·g-1 when the shaking time was 15 min. The cobalt adsorbed on the adsorbent could be completely eluated and recovered using 10 g·L1 EDTA solution. The enrichment factor was more than 100. The detection limit of cobalt was 0.46 ng·L1.The purposed method has been applied to the pre-concentration and separation of cobalt in the water sample, the recovery 97.94%-101.6%.
Study on Preparation and Performance of CaO-ZrO2 Composite Powders
Authors: Li Yang , Wang Shao Yan
Published: November 2013

CaO-ZrO2 composite powders were synthesized by liquid phase coprecipitation using ethanol as reaction medium and washing solution. The green compacts were formed by dry pressing and were sintered by pressureless sintering. The morphology, size and distribution of the particles were studied by transmission electron microscopy (TEM); the microstructure of sintered bodies was analyzed by scanning electron microscopy (SEM), the density of green compacts and sintered bodies were tested by the mass and dimension. The results showed that 5 mol% CaO-ZrO2 composite powders with good dispersion, particle size distribution were obtained. The fractured surfaces of sintered bodies prepared by the powders were smooth without any cracks. When contained 5-15mol% CaO, the relative density of sintered bodies exceeded 95%. When the molding pressure was 20Mpa, the relative densities of sintered bodies were all above 97%.
Development of a New Type of Column Magnetic Separator
Authors: Zhao Tong Lin , Dai Shu Juan
Published: November 2013

A new type of column magnetic separator has been developed, and a series of experiments have also been carried out in this paper. The structureseparating mechanismexperiments of column magnetic separator are introduced. The results show that the separator can produce concentrate from rough grinding products directly. The findings of orthogonal experiment show that the cycle of magnetic-field, the electrical current intensity and the position of magnetic system have remarkable effect on the experiment results. The optimized cycle of magnetic system is 0.2s, the optimized volume flow of the feed is 10cm3/s, the optimized electrical current is 11A ; the optimized water flow velocity is 11.1mm/s; the optimized position of magnetic system 20mm from the edge of cleaning area. Under the condition of the feed containing 47.99% TFe, an iron concentrate containing 66.27% TFe with 61.63% Weight ratio are obtained by using it to separate the rough grinding products of Nanfen ore dressing plant.
Preparation of MICTE and its Application in Speciation Analysis of Chromium in Environmental Waters
Authors: Song En Jun
Published: November 2013

In this paper, a manual-controlled injection nanometer calcium titanate based on glass fiber filter enricher (MICTE) was prepared, and its application in speciation of Cr (III) and Cr (VI) was studied. The optimum experimental parameters for separation of the Cr (III) and Cr (VI) have been investigated. The results showed that the MICTE had adsorption capacity towards the Cr (III) and Cr (VI). And two forms of chromium show different adsorption capacities at different pH values, Cr (III) could be adsorbed at pH 9, but Cr (VI) cant be adsorbed. Whereas Cr (VI) retained at pH 3, but Cr (III) cant be adsorbed. Therefore, it is possible that the two forms of chromium are complete separated. The Cr (III) and Cr (VI) could be completely eluted with 1 mol·L1 HCl and 1 mol·L1NaOH, respectively. The chromium concentration was measured by atomic absorption spectroscopy. A new method for determination of the speciation of chromium in environmental water samples based on the manual-controlled injection enricher and atomic absorption spectroscopy determination was proposed. The method was successfully applied for the determination of Cr (III) and Cr (VI) in environmental waters with satisfactory results.
Experimental Research on the Lean Magnetite of RongTian Mine Corporation by Single Magnetic Process
Authors: Cheng Zhong Hang , Yu Ke Xu , Zhao Tong Lin , Wang Xiao Li
Published: November 2013

In this paper, the mineral properties of the lean magnetite in RongTian mine corporation was studied, during which the analysis of the mineral properties, prelimenary separation on the lump mine, two-section grinding, one section fine screening and three-section low intensity magnetic separation process were carried out. The results showed that if the suitable mineral processing flowsheet is adapted, we can achieved such index:concentrate grade of 63.65%, Fe recovery of 47.12% based on the ore grade of 10.05%.. According to the experimental result analysis, most of the iron minerals could be used to support the steel production of LingGang Group.Single magnetic process proved to be an suitable and promising process to conduct the fine particles of lean magnitite.