bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Temperatures on Tensile of Aluminium Thin Films
Authors: Guo Qiao Neng , Yang Shi E , Sun Qiang , Jia Yu , Huo Yu Ping
Published: June 2012

The mechanical process of single-crystal aluminium thin films under uniaxial tensile strain was simulated with molecular dynamics method at different temperature. The stress–strain curve and potential energy–strain curve of thin aluminium film under uniaxial tensile deformation were obtained by molecular dynamics simulations. With the changes of sample temperatures in uniaxial extension, the variation characteristics of stress–strain curves are alike at the elastic stage and different at the plastic one below and above 370 K, respectively. From the stress–strain curves, we gained the first local maximum stress-temperature curve and the strain at the first local maximum stress-temperature curve, and found that the strange temperature dependence of first local maximum stress: when the temperature is above 370 K, the stress goes down quickly with temperature, and when below 370 K, it descends slowly. With increasing temperature, the difference between two strain values corresponding to two maximal potential energies changes slowly below and above 370K but it goes up quickly about 370K. By these dependences, we have identified the critical temperature （370K） for the transition of plastic flow mechanism.
Compressive Mechanical Properties of Carbon Nanotube Sponges: Experiments and Modeling
Authors: Sun Peng Zhan , Zhu Hong Wei
Published: June 2012

Carbon nanotube (CNT) sponges are three-dimensional frameworks of interconnected CNTs with great potentials in composite and environmental applications. CNT sponges with lateral sizes of centimeters have been prepared through chemical vapor deposition (CVD), and their compressive mechanical properties are studied. To gain deep insight on the microstructure and how CNTs are connected within the sponges, we propose a simple theoretical model to understand the arrangement as well as the interconnection of CNTs. The mechanical properties of CNT sponges can be well explained and predicted using this model.
Friction Welding of Zr41Ti14Cu12.5Ni10Be22.5 Bulk Metallic Glass and Temperature Field Simulation
Authors: Chen Biao , Shi Tie Lin , Liao Guang Lan , Zhu Zhi Jing
Published: June 2012

In order to enhance the application of bulk metallic glass (BMG) as engineer material, it is necessary to develop appropriate bonding technology to solve the problems of size limitation and weldability. In this work, a friction welding set-up was constructed, and the Zr41Ti14Cu12.5Ni10Be22.5 BMG rods were joined. The joint interface zone was examined by X-ray diffraction, Scanning electron microscope, Vickers Micro-hardness and Transmission electron microscope. The results showed that the BMG rods were successfully joined, where no crystallization and visible defects were observed. The welding joint maintained the amorphous structure except few nanocrystallines occurred. Then the temperature field simulation was executed using ANSYS finite element software to optimize the welding parameters. It indicated that friction time cannot exceed 0.25s under the given experiment conditions, otherwise the crystallization would occurred, which is in good agreement with the experiment. It is concluded that the temperature field simulation can be used to guide the experiment and the friction welding can be used to join the BMG.
Investigation on the Infrared Absorption Spectrum of Pearl and Nacre
Authors: Huang Cun You , Chen Qing Xiang , Xiong Zheng Ye , Feng Yu Jun , Li Yong Qiang , Wang Hui
Published: June 2012

The infrared absorption spectra of some saltwater pearl and shell are investigated; the micrographs of the pearl and nacre layer are viewed. The result shows that infrared absorption spectra of pearl and nacre comprise the spectra of nanophase CaCO3 and other unidentified material, this can evidence that nacre is a kind of biologic composite material composed of nanophase calcium carbonate.
Effect of Hydrolysis on High-Purity TiO2 Size for PTC Thermistor
Authors: Luo Zhi Qiang , Du Jian Qiao
Published: June 2012

The effect of self-generated seeded thermal hydrolysis factors, such as TiOSO4 solution concentration, grey aging time, volume ratio of TiOSO4 to pre-adding water, and heating rate on high-purity TiO2 size for PTC thermistor were studied. The samples were characterized by particle size distribution, and SEM. The results show that with increase of TiOSO4 solution concentration, the high-purity TiO2 size decrease gradually, but with increase of grey aging time and volume ratio of TiOSO4 to pre-adding water respectively, the high-purity TiO2 size also increase. The suitable TiOSO4 concentration is 160g/l, grey aging time is 15min, the optimum volume ratio of TiOSO4 to pre-adding water is 4.0:1 and heating rate should be 1.5°C/min.
Polymer-Assisted Hydrothermal Synthesis of PbTiO3 Crystals
Authors: Wang Yong Gang , Yang Lin Lin , Wang Xin , Li Song , Wang Yu Jiang , Wang Xiao Feng
Published: June 2012

Using polymer as a surfactant, we successfully synthesized of PbTiO3 crystals with a self-assembly structure by a hydrothermal process. The as-obtained powders were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The results show that the presence of PVP, PEG and PVA plays a key role on the formation of self-assembly structure and the corresponding formation mechanism was briefly discussed.
Preparation and Characterization of the PMIA Fibrous Membrane
Authors: Wang Rui Bin , Yu Meng Jiao , Yang Fei , Guo Jie , Yang Ren Dang
Published: June 2012

This article highlights the poly (m phenylene isophalamide) fibrous membrane (PMIAFM) fabricated by electrospinning technique, and the effects of the process variables such as applied voltage and concentration of the PMIA solution on the morphology and properties of the PMIAFM were addressed. The morphology and structural analyses on electrospun nanofiber membrane using apparatus e.g. scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). The results showed that the membrane with better morphology was derived from 7wt% of the PMIA, an applied voltage of 18kV, of which the diameter ranged from 100nm to 1μm; within the spinnable concentration range, the concentration of the PMIA solution was proportional to the size of the fiber; and if the voltage beyond or miss the normal figure, namely 18-25kV, a instable jet would emerge.
Preparation and Influencing Factors of ZnO Whisker by Hydrothermal Microemulsion Process
Authors: Ai Xiao Dong , Yan Lu Ting , Liu Y. C. , Li T. X. , Dou S. Y. , Dai C. A.
Published: June 2012

ZnO nanotetrapods were prepared by hydrothermal emulsion method. The X-ray diffraction result showed the hexagonal wurtzite structure of the ZnO nanotetrapods. The main morphology of the ZnO whiskers is a nanotetrapod, aside from the sheet- and flower-shaped ZnO. Growth time and cyclohexane dosage exert some influences on the morphology and size of ZnO. In addition, aluminum doping plays an important role on the morphology of ZnO.
Secondary Use of PHEV and EV Lithium-Ion Batteries in Stationary Applications as Energy Storage System
Authors: Zhao Guang Jin , Wu Wen Long , Qiu Wu Bin , Liu Shao Lin , Wang Gang
Published: June 2012

This manuscript introduces and reviews the background, necessity, opportunities, and recent research progresses for investigating and applying the secondary use of plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs) lithium-ion (Li-ion) batteries in stationary applications. And the motivation, objective, and plans of our PHEV/EV lithium-ion battery secondary-use program are also described in detail.
The Effects of Selenization Temperature on the Properties of CIGS Thin Film Prepared by Cu-In-Ga-Se Precursors
Authors: Wang Han Bin , Zhang Xi Jian , Wang Qing Pu , Zhang Xue Yan , Liu Xiao Yu
Published: June 2012

CIGS thin films were prepared by selenization of Cu-In-Ga-Se precursors, as a new method, the effects of selenization temperature on the properties of CIGS thin films were studied. First, Cu-In-Ga-Se precursors were deposited onto Mo-coated soda lime glass by evaporation and sputtering method. Then, precursors were selenized at various temperatures in N2 atmosphere for 120 min to form CIGS thin films. The degree of reaction and morphology of films as a function of selenization temperature were analyzed. By means of field emission scanning electron microscope (SEM) and X-ray diffraction (XRD), it was found that CIGS thin films selenized at 450°C exhibit chalcopyrite phase with preferred orientation along the (112) plane.
Chitosan-Aluminum Monostearate Composite Dispersion Characteristics
Authors: Yodkhum Kotchamon , Phaechamud Thawatchai
Published: June 2012

Fatty acids have been used as additive for modifying chitosan-based system particularly in hydrophobic manner. Generally, techniques for preparing chitosan-fatty acid conjugate system are take time, involved with high temperature and high shear force and need some surfactants. In this study, alternative technique for simply blending chitosan with fatty acid was performed by taking advantage of ionization of metal stearate and chitosan in acidic condition. Metal stearate used in this study, aluminum monostearate (Alst), was dispersed in chitosan dissolved in lactate buffer solution pH 4.5 with various concentrations of chitosan. Physicochemical properties such as pH value, viscosity and rheology, morphology and particle size of the dispersions were characterized. The pH value and viscosity of the chitosan solutions was higher as the chitosan concentration was increased. For the dispersions, their pH value was not changed by mixing time but their viscosity was decreased by mixing time. All dispersions exhibited Newtonian flow behavior. Larger mean particle size of the dispersions was observed when the mixing time was longer. At higher chitosan concentration, mean particle size of the aggregated chitosan-stearate particles was smaller than the lower chiotsan concentration systems
Effect of TiO2 Compact Layer on Optical Absorption and Fluorescence Performance of R6G/PMMA Composite Light - Guided Films
Authors: Mukdachacharoenchai P. , Mekprasart Wanichaya , Sritharathikhun J. , Pecharapa Wisanu
Published: June 2012

Rhodamine 6G (R6G) and Poly(methyl methacrylate) (PMMA) light-guided films accompanied with titanium dioxide thin layer were prepared by spin-coating process onto on glass substrate. Dichloromethane was used as disperser for blending R6G and PMMA. The TiO2 layer thickness was varied by controlling spinning speed. The effects of TiO2 layer with different thickness on optical absorption and florescence performance of the films were investigated and the results exhibited strong absorption of TiO2 in UV region and the enhancement in florescence efficiency with increasing TiO2 film thickness.
Photocatalytic Degradation of Sulfonamides over the Short Multi-Walled Carbon Nanotube-TiO2 Hybrid
Authors: Dai Ke , Chen Hai Bo , Liu Chang Wei , Chen Hao , Huang Qiao Yun
Published: June 2012

The short multi-walled carbon nanotube-TiO2 (SMWNT-TiO2) hybrid was synthesized via direct growth of TiO2 nanoparticles on the surface of the functionalized SMWNTs by the hydrothermal treatment and utilized as the photocatalyst in the sulfonamides degradation under UV light irradiation. The photodegradation efficiency of sulfonamides was examined by HPLC technique, which demonstrates that sulfonamides can be readily degraded under UV light irradiation. However, the four sulfonamides have different degradation rates, which is in the order of sulfadimidine > sulfanilamide > sulfamethoxazole > sulfathiazole. These experimental results can be attributed to the point charge of the atoms in the sulfonamide molecule and its adsorption on the surface of the SMWNT-TiO2 hybrid.
Study on Surface Modification of Nano-Alumina with Silicane Coupling Agent KH550
Authors: Shan Fu Rong , Yu Zhi Ming , Wang Meng Qi , Zhang Yang
Published: June 2012

Silane coupling agent KH550 was used to modify the surface of nano-alumina. Ultrasonic dispersion was employed to take the place of traditional mechanical stir. Absorbency of the aqueous solution of nano-Al2O3, which had been modified, was determined to confirm that under this process condition the optimum amount of KH550 was 2.5% while the optimum time was 50 minutes. The infrared spectra indicated that the surface of nano-Al2O3 had been modified and the absorption of KH550 really existed there.
Preparation and Characterization of Attapulgite-KH550 Nanocomposites and their Application to Methane Absorption
Authors: Liu Fei , Hu Tao , Ren Shi Ying , Shi Ying Ying
Published: June 2012

Attapulgite is a natural rod-like nanomaterial. The surface of natural attapulgite nanoparticles was cleaned, modified with silane coupling agent 3-aminpropyltriethoxysilane (KH550). The structure and morphology of the modified attapulgite were characterized by infrared spectroscopy, scanning electron microscope (SEM). The methane absorption capacity of the modified attapulgite was recorded by intelligent gravimetric analyzer. SEM revealed that 3-aminpropyltriethoxysilane was modified on the surface of rod-like attapulgite nanoparticles. The 3-aminpropyltriethoxysilane can obviously increase the methane absorption capacity of the nanoparticles almost about twice. This result may provide the attapulgite nanoparticles a new way to industrial application.
Preparation and Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg20Ni10-xMx (M=Co, Cu; x=0-4) Alloys
Authors: Zhang Yang Huan , Hou Zhong Hui , Zhang Guo Fang , Shang Hong Wei , Hu Feng , Zhao Dong Liang
Published: June 2012

In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy, the Ni in Mg2Ni alloy has been partially substituted by M (M=Co, Cu), and the melt spinning has been used to fabricate the Mg20Ni10-xMx (M=Co, Cu; x=0-4) hydrogen storage alloys. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The effects of substituting Ni with M (M=Co, Cu) on the gaseous and electrochemical hydrogen storage kinetics of the as-spun alloys were investigated. The results indicate that the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure, while the as-spun (M=Cu) alloys hold an entire nanocrystalline structure, suggesting that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The substitution of M (M=Co, Cu) for Ni exerts a trifling impact on the hydriding kinetics of the alloys, but it renders a marked enhancement of dehydriding capacity and kinetics. Furthermore, the measurements of the high rate discharge ability (HRD) and the hydrogen diffusion coefficient (D) as well as the electrochemical impedance spectra (EIS) of the alloys exhibit that the electrochemical kinetics of the as-spun (30 m/s) alloys is significantly ameliorated by substituting Ni with M (M=Co, Cu).
Preparation of Cortex Moutan Nanoparticles and its Microscopic Characteristics and Physicochemical Properties
Authors: Cui Yu Jia , Wang Wei Guo , Li Peng , Zhao Yong Liang , Gu Ya Nan , Meng Tian Tian , Ding Jin Ju , Zhang Peng , Jia Ke
Published: June 2012

Objective In order to increase the Paeonol dissolution and content, cortex moutan were smashed into nanoparticles, and the dissolution and content were compared by microscopy before and after super-micro-particle pulverization. Methods Super-micro-particle pulverization and general grinding were used to broke Cortex moutan into particles. The microscopic morphous characteristics of the before- and after- ultra-disintegration particles were compared by microscopy. Methods of HPLC was used to determine the content and dissolution of Paeonol with different grinding conditions. Methods of precipitation and funnel way were used to examine the stability and fluidity of cortex moutan nano-particles. Results Cortex moutan powder after super-micro-particle pulverization appears sphere or like-sphere, and its average size is 200nm~300nm. After the superfine grinding Paeonol dissolution increases 76.19% in comparison with without nano pulverization. The nanoparticle rest angle is θ=33°.The precipitation ratio of Cortex moutan powder with general grinding is 0.28 at 24h, and the precipitation ratio of its nano-power has been to 0.98 at 60min. Conclusion Paeonol dissolution, stability and fluidity of Cortex moutan nanoparticles were improved greatly and this nanoparticles is beneficial to industrial production for traditional Chinese medicine.
Preparation of Liuweidihuang Nano-Microcapsules and its Physicochemical Properties
Authors: Cui Yu Jia , Wang Wei Guo , Li Peng , Zhao Yong Liang , Gu Ya Nan , Meng Tian Tian , Ding Jin Ju , Zhang Peng , Jia Ke
Published: June 2012

To prepare out a novel preparation of liuweidihuang which effectively preserves Paeonol, Ursolic acid and Polysaccharides, and the preparation process should be scientific, lower-price and simple. The microscopic characteristics and its physicochemical properties of super-micro-particle of liuweidihuang from above process were also discussed. Methods According to the therapeutic and physicochemical properties of materials in liuweidihuang, the processed technology is as follow: Ripe rehmannia glutinosa,Tuckahoe and Alisma digitalis were boiled for 4.5h., the root bark of the peony tree(Paeonia suffruticosa), dogberry and yam were smashed to nanoparticles. Then select the reasonable method to drying the mixture. The microscopic shape characteristics of the before- and after- broken particles was compared. Paeonol content and dissolution were determined by HPLC. The stability and fluidity of liuweidihuang nanoparticles were examined by precipitation and funnel way. Results The approach of prepared liuweidihuang nano-microcapsules is scientific, lower-price and simple. The average size of processed super-micro-particle of liuweidihuang is 400±46nm. The hardness of the table is 9.7kg/cm2. The thickness of the table is 0.6cm. The friability of the tablet is ＜1%. Each tested item complied with standards of troches of Chinese medicine, and it is beneficial to industrial production for Chinese medicine.. Conclusion The nano-microcapsule is dispersive, desiccative, mobilizable, stable and three times concentrated than traditional pills of Liuweidihuang. It also can be used to produce different forms of drugs in the market.
A Computational Study on Structures, Stabilities and Electronic Properties of Trifluoromethyl Silsesquioxanes Si2nO3n(CF3)2n (n=1-5)
Authors: Yu Shu Yuan , Zhang Cheng Gen , Wang Ya Lan
Published: June 2012

Density functional theory (DFT) calculations were performed to investigate the structures of trifluoromethyl silsesquioxanes Si2nO3n(CF3)2n(n=1-5). Our study focuses on the structures, stabilities, and electronic properties of the trifluoromethyl silsesquioxanes. The large HOMO–LUMO gaps, which range from 5.38 to 8.02 eV, imply optimal electronic structures for these molecules.
High-Gain Laser Diode Array Side Pumped Nd: Glass Rod Amplifier
Authors: Nie Yu Mei
Published: June 2012

With the optimized side pumped module structure, three laser diode arrays rotating symmetrically pump the Nd: Glass rod. The size of the Nd: Glass rod is Φ2 mm×75mm, with the doping concentration of 4at%. The surface of both ends of the rod coated with antireflection film at 1053nm, the rod was tilted 1.5°in order to eliminate the oscillation of amplified spontaneous emission (ASE). The seed, with energy 10μJ, operating frequency of 1Hz, pulse width 3ns, output wavelength 1053nm, through the Nd: Glass amplifiers reaches 70 times stable high-gain when the pumping power is 8.2kW and the pulse-width is 400μs. Meanwhile, the fluorescence distribution of the amplifier is homogeneous.
The Influence of Ring Inside-Laser Coaxial Powder Feeding Process Parameter on Forming
Authors: Zhang Ying Yin , Shi Shi Hong , Fu Ge Yan , Zhu Ping , Cai Wei
Published: June 2012

This experiment uses the shower nozzle of the ring laser inside-laser coaxial powder feeding for single channel /layer, defocusing, and multi-channel lap cladding. This study investigates the influence of process parameters (such as the laser power) on forming size and surface morphology. In certain limits, the cladding layer height and width are in positive correlation with laser power and powder feeding rate, and in negative correlation with scanning velocity. When the lap coefficient is 50%, the forming quality is high.
Laser Impulse Detection System Based on Piezoelectric Film Sensor
Authors: Peng Yu Feng , Jin Long , Lin Si Hong
Published: June 2012

In order to use relatively simple approach to detect the laser impulse chose the polymer organic thin-film piezoelectric sensor with high sensitivity, wide dynamic range, good frequency band response and other good characteristics, designed the subsequent amplifying and detecting circuit. The sensor converted non-electricity quantity of laser impact to measurable electricity quantity via piezoelectric effect and the amplifier circuit. After the detection system processing, the final output signal was displayed by the oscilloscope and made simple analysis of the results.
High Beam Quality All-Solid-State 1053nm Nd: Glass Amplifier Shaping by LCSLM at Repetition Frequency
Authors: Qiu Ji Si , Fan Zhong Wei , Tang Xiong Xin , Lian Fu Qiang , Zhang Xiao Lei , Ma Yun Feng
Published: June 2012

A laser amplifier of LD pumping Nd: glass with a high beam quality and stability, which amplifies nanosecond laser pulse, has been developed in this paper. Under 1Hz repetition frequency, when the flat top pulse of 3 ns width and 1 nJ energy is injected as the seed pulse, the average output energy of the laser amplifier is 115.3 mJ with a net gain of 109, the energy dispersion degree of the outputting laser is no more than 2%; the modulation degree near field is less than 1.23:1.
Single LD Pumped Nd: YAG Intra-Cavity Frequency Doubling Blue Pulse Lasers
Authors: Dai Q. , Geng Y. , Liu Y.J. , Li Y.Q.
Published: June 2012

To design and achieve a 473nm Q-switched blue laser, with single LD side-pumping structure, this dissertation firstly made 946nm operation of quasi-three-level system possible. After inserting the frequency doubling crystal-LBO and the passively Q-switched crystal-Cr: YAG into the laser cavity, the 473nm blue laser output was obtained at high repetition. When pumped currency reaches 4A, laser pulses of 25ns are generated with average power of 0.11w, repetition rate of 8.3 KHz which satisfies many applications’ requirements.
Vibration Characteristic Analysis and Research of High Speed Dynamic Balancing Machine
Authors: Zhang Qing Lei , Shen Hai Ou , Zhao Bai Yu , Guo Jing Kuan
Published: June 2012

Dynamic performance of high speed dynamic balancing machine directly affects the accuracy and safety of dynamic balancing machine. ANSYS 12.0 was used to establish the frame structure model in this paper. The four models of dynamic balancing machine were calculated respectively. The calculation results show that additional stiffness can greatly improve the natural frequencies of dynamic balancing machine. In addition, as the base is large, we can ignore the influence on natural frequencies caused by the base.
The Rotor’s Modal Analysis of the Vertical Shaft Impact Crusher
Authors: Zhang Li
Published: June 2012

Used the Solidedge to bulid the solid model of the Vertical Shaft Impact crusher’s rotor, then it is imported into Ansys for modal analysis, get the former twenty frequency and vibration model, through the twenty color vibration models and vibration animations attained from analysis, the rotor’s dynamic properties and weakness area could be detected directly, to set up the foundmental theory for the structure design.
A Novel Method for Pulse Integration in Radar-Probing System
Authors: Xi Ya Ming , Huang Rong Jiu , Han Yan Jing , Zhang Qing
Published: June 2012

In this paper, a novel method for pulse integration in radar-probing system is proposed to yield a low sidelobe response. According to m-sequence widely used in spread spectrum communication system, a bipolar pulse sequence is designed in this paper. At the receiving end, the envelop-detected signal is processed by a corresponding algorithm which dilutes the range sidelobe influence much. Because of the good autocorrelation and cross-correlation properties, waveforms yield a low sidelobe response and major lobe to side lobe ratio can reach 30dB or more, which is easy to satisfy the practical requirements. Simulation results show the good performance of the proposed approach. Furthermore, the approach is compatible to the conventional radars and can also be applied to the upgrade of radar.
Analysis of Acoustic Performance of Compound Muffler by Finite Element Method
Authors: Cai Deng Hui , Ma Xin Tan
Published: June 2012

Since the theory of one-dimensional plane wave can not accurately predict the internal sound field of the complex structure muffler. The three-dimensional finite element method is adopted to establish the acoustic model of the composite muffler based on the application of composite muffler model. Transmission loss and characteristics of internal sound field of the composite muffler's are calculated through acoustic vibration software Sysnoise. The calculation shows that the muffler under the interference of fluid flow has the higher transmission loss compared with the absence of liquidity function with an additional silencer band. The analysis method and conclusions provide a basis for the design of composite muffler.
NC Processing Network Platform RS-232-C Interface Circuit Design
Authors: Yang Hong Cai , Wu Ming Qing
Published: June 2012

RS-232-C and a modem together, the interface can connect all kinds of different types of micro computer, so that they can direct communication. Nowadays more popular FANUC series CNC system, and the machine is equipped with a 25 injection of RS-232-C asynchronous serial communication interface standards, connect the computer and programmer and peripherals. With MAX232 chip design of interface circuit DB9.
Comparative Study of Human Gait by Using Video Motion Capture System
Authors: Gao Yi
Published: June 2012

This paper, by using German Simi Motion walking motion system, quantitatively describes the parameters and indicators of the human gait characteristics, tracks and captures the characteristics of body movement and motions of articulation points, compares the gait characteristics between different people, conclude significant differences between walking gait characteristics corresponding to different leg heights and knee bending angles through a large number of experiments, and finds out a description of stability and diversity under different human gait characteristics. This study extends the range and ideas of biological personal identification technology research, so as to provide a more scientific description of gait characteristics, so this study sets a basis for personal identification and establishing identity by using gait characteristics.
The Exploration of Dynamical Model and Control Analysis Based on DOF Small Scale Helicopters
Authors: Yao Jie , Zhu Yong Hong
Published: June 2012

In order to stimulate the movement of small scale helicopters, DOF flight test platform based on the similarity theory has been thought out. Accordingly, considering the platform to be the researching object and combing the Lagrange-Euler equation with the equivalent moment method, the system kinetic model is worked out and the physical parameter is pre-estimated. The relationship between the lift force and the change of the rotation speed is acquired by the experiment with the fixed collective angle. According to the dynamic equation, a PID revised feed-forward controlling algorithm with robust characteristic was devised and the MATLAB simulation is applied to verify fast astringency and validity of the controller
NC Lathe Cutting Force Measurement Method and Application of Online
Authors: Ma Yong Qing , Wu Ming Qing
Published: June 2012

Cutting force measurement system by force measurement instrument, general data collection system and PC of three parts. The size of the cutting force general use have experimental results set up experience formula. Introduces two kinds of accurate measurement method of cutting force. Choose DEWESoft data collection and analysis system software as research means of cutting force. Through technical analysis and cutting force measurement technology development direction was predicted.
Design of Finite State Machine Based on VHDL
Authors: Zhu Zhi Ping , Liu Yong Qin , Sheng Hong , Ye Feng
Published: June 2012

Different encoding scheme and method for process description of state machine are analyzed in detail, and the advantages and disadvantages of each are pointed out. The general state machine design method is given by a specific example program, according to the actual need, designers can choose different encoding scheme and method for process description to design.
Application of PID Control Based on Repetitive Compensation in Transmission System of Double-Side Blade Grinding Machine
Authors: Yang He Ran , Zhang Lei , Zhang Zuo Jie , Zhao Guo Liang
Published: June 2012

A control structure of PID control based on repetitive compensation for the X axial transmission system of the double-side blade grinding machine is proposed in this paper. The repetitive control structure is applied into the common PID control method. Then the simulation for the position control of the transmission system is carried out to verify the effectiveness and feasibility of the proposed control algorithm by Simulink. The results show that the control algorithm proposed in this paper has a good prospect in precision machine tools.
Modern Manufacturing Enterprises Heterogeneous Data Integration System Based on Web Services
Authors: Liang Xiao Xiao , Li Shi Wen , Zhan Xu , Wei Chong Gang
Published: June 2012

This webinar introduces an approach to data access across heterogeneous data sources and Web service integration based on XML and XQuery. The webinar covers: using XML to create logical views of a variety of physical data sources, aggregating XML documents with relational data, consuming Web services in XQuery, and exposing XQuery as data services while writing, testing and deploying real XML and XQuery-based solutions. The paper conducts web service and analyzes Modern Manufacturing Enterprises heterogeneous data source and proposes a heterogeneous data integration system based Web Services. The system provides a possible approach to share and interactive enterprise data.
Diagnosis of Stator Winding Inter-Turn Circuit Faults in Induction Motors Based on Wavelet Packet Analysis and Neural Network
Authors: Sang Jun Yong , Hao Chen , Wang Peng Chao
Published: June 2012

Aiming at the problem of the traditional stator current frequency spectrum analysis method cannot completely guarantee the accurate identification of stator winding inter-turn faults,the diagnosis method of stator winding inter-turn based on wavelet packet analysis (WPA) and Back Propagation (BP) neural network is put forward. The finite element model of the three-phase asynchronous motor which is based on Magnet is established, and analysis the magnetic flux density and current of the motor through simulation in normal and in the situation of short-circuit fault of stator winding inter-turn, the current signal of stator is analysised by wavelet packet , and the feature vector of frequency band energy is extracted as the basis to judge the state of induction motor running, and the motor state is identified by BP neural network, and the mapping from feature vector to the motor state is established. Simulation results show that: The diagnosis system of inter-turn fault based on WPA and BP neural network can effectively identify short-circuit fault between ratios. This is to say that the method has a high fault diagnosis rate.
The Calculation of Photovoltaic System Generation Access Capacity in Distribution Network Based on Probabilistic Power Flow and the PSO Optimization
Authors: Ma Lu Yao , Yao Shu Jun , Wang Yan , Yang Jing , Liu Long Hui
Published: June 2012

With the distributed generation such as photovoltaic power system (PVS) is largely introduced into power grid, some significant problems such as system instability problem increase seriously. In order to make full use of PVS and make sure the voltage exceeding probability is limited within a certain range to ensure the power quality, as well as consider the cost of access device, the suitable PVS access node and capacity is important. Based on this problem, this paper establishes the probabilistic power flow model of PVS by introducing the combined Cumulants and the Gram-Charlier expansion method. Also, to solve the nonlinear combinatorial optimization problem, this paper uses PSO algorithm. Finally to get the suitable PVS access node and capacity, also calculate the solution of voltage exceeding probability.
NC Lathe Cutting Force Signals Online Monitoring System Design
Authors: Zhang Yu
Published: June 2012

The numerical control lathe cutting force signals online monitoring system is a kind of real-time monitoring collection system, can be in a variety of numerical control machine running smoothly above. The articles on cutting force measurement and the establishment of the formula, from the data acquisition card selection and application, the choice of system software parts design, the system design.
Design Ethics Based on Advanced Manufacture Technology
Authors: Gao Xing , Li Liang Zhi
Published: June 2012

Advanced manufacture technology as the impetus of modern society represents a fundamental shift of the nature of human manufacture. This shift is the modification of manufacture tradition that has come into being since industrial revolution, or simply the transformation of “technology-goes-first” principle into “anthropocentricism.” Therefore manufacture technology transcends its technological quality and becomes effective means for constructing sound relations between people and between people and environment, which is worth a study in terms of design ethics.
Theoretical Analysis of Power Transfer Performance of Primary and Secondary Compensation Topology of Inductive Coupled Power Transfer System
Authors: Zhang Xu , Meng Guo Ying
Published: June 2012

Inductive coupled power transfer system is based on the principle of electromagnetic induction to transfer power from the primary side to the secondary side of a loosely coupled transformer, which can transfer electricity wirelessly. The loosely coupled transformer has large leakage inductance, which reduces the power transfer efficiency. In order to reduce the leakage inductance, a capacitance is used at the primary side and secondary side of a loosely coupled transformer, which can increase the power transfer efficiency. For four different compensation structures, this paper analyses the coupling coefficient and the secondary quality factor’s influence on the voltage gain, current gain and transfer efficiency, and also compares different compensation structures
Quality Management Information in Auto Manufacturing Process
Authors: Htay Maw Maw , Sun Li Bo , Khaing Mi Aye Su
Published: June 2012

Automotive manufacturing has become less contained within an organization and more dispersed through outsourcing, the main challenge is that of ensuring quality adherence across the extended supply chain. This has the need for the large automakers to engage in greater collaboration in the design phase and provide visibility into internal operations. This paper discusses about the auto manufacture process flow and quality information classification in the four main manufacture processes. Due to global competition, companies have indeed emphasized that quality should have to be put in place, integrated into all aspects of products and services within their management system. Hence total quality management has become increasingly popular as one of the managerial devices in ensuring continuous improvement as to improve customer satisfaction and retention as well as to ensure its product or service quality. Importantly, employees are regarded as the most important entity in ensuring that total quality management can be carried out successfully in an organization.
Fault Diagnosis of Construction Elevator Based on Fuzzy Recognition
Authors: Liu Li Mei , Li Jian Bin
Published: June 2012

Fault eigenvector, fault fuzzy vector and fuzzy relation matrix of the construction elevator is built on using the fuzzy recognition method in the fault diagnosis system of the elevator. On the basis of every fault membership obtained through fuzzy recognition, the equipment fault is confirmed according to max membership principle. The test shows it can effectively help to estimate cause of fault and to avoid the accidents when the fuzzy recognition method is used.
NC Lathe Cutting Force Signals the Design of the System Test
Authors: Zhang Mian Hao
Published: June 2012

When tools in mechanical wear happens, the radius is also the radial dimension, this reflects the size is changed. Use DEWESoft-6-LT1 software as the experimental data acquisition software. To force the signal directly time domain information analysis and evaluate, using a characteristic frequency to determine the frequency value tool wear state.
Effects of Oxygen Partial Pressure on the Sputtered Hafnium Oxide Thin Films for Resistive Random-Access Memory
Authors: Xie Zhong Liang , Lai Yun Feng
Published: June 2012

Hafnium oxide thin films were deposited on silicon substrates by RF reactive magnetron sputtering. The effects of oxygen partial pressure, tuned by the O2/Ar flow ratio, on the microstructure and electrical properties were characterized. All HfOx thin films exhibit monoclinic phases. As the increase of O2/Ar flow ratio from 0.08 to 0.33, the crystallinity is improved accompanied with the decreases of flat band voltage and leakage current density. However, when the O2/Ar flow ratio further increases to 0.5, the crystallinity becomes worse with the increase of flat band voltage and leakage current. The HfOx based resistive random-access memory (RRAM) has been fabricated and its storage properties were also investigated.
Analysis and Optimization of Expropriation Business Process of Equipment Mobilization
Authors: Li Wen Sheng , Zhao Mei , Wang Li Xin , Shi Xian Ming
Published: June 2012

In this paper, expropriation business process of general army-civilian equipment mobilization is firstly described in detail. Then, to resolve resources conflict that often appears in equipment expropriation, we establish a Petri net model of equipment expropriation business and estimate its average service time based on random Petri net. Moreover, we still give some advices on improving expropriation business process and provide an effective way to realize an efficient mode of operation for equipment expropriation business. Finally, we put forward an expropriation case to verify the method to be scientific and operable.
Petroleum Sulfonates as Oil Displacement Agent and Application
Authors: Xiong Sheng Chun , He Ying , Cui Mao Lei
Published: June 2012

In terms of the condition of injection water after polymer flooding of Gudao oilfield, the following water quickly broke though the bank to the production wells, while most of residual oil remains in the formation. To solve the problem, two kind of petroleum sulfonates made in China are selected to form oil displacement agent (ODA) solution. The petroleum sulfonate available for crude oil of Gudao oilfield with the ultra-low interfacial tension is found by drawing an oil/water interfacial tension contour diagram. The results show that the interfacial tension can be lower than 3.6×10-4mN/m when the active agent contained with 0.25%KPS+0.225%APS, and the agent reduces water resistance of entering the hole to improve sweep coefficient and oil displacement efficiency. The existence of the polymer has no influence on the balanced value of interfacial tension, but just delays the interfacial tension to reach the balance. Pouring into 0.3 pore volume (PV) high-efficient ODA can improve 17% oil recovery. Synergistic effect of two kind of petroleum sulfonate with low cost to enhance oil recovery will have a great prospect for enhanced oil recovery (EOR)
Evaluation and Optimization of Grid Patterns of Silicon Solar Cells by Diode and Series Resistance Model
Authors: Fan Sheng Kai , Liao Jia Xuan , Wei Xiong Bang , Hu Sheng Hua , Yu Jian
Published: June 2012

Series resistance in solar cell is known to be one of the key factors which need to be optimized, especially through the design of the front pattern. This paper is the utilization of the improved diode and series resistance model to represent the solar cell. The results show: three buses are suitable for high square resistance and fine grid line. Plating technology can improve the absolute conversion efficiency over 17%. In addition, 71 fingers for three buses and 76 fingers for two buses were select in production. It is imagined that the proposed model is very useful for PV professionals who require simple, fast and accurate PV model to design their cells.
Resonance Escape Factor and Abundance of Plasma Li I Resonance Lines at 671nm
Authors: Xiong Guo Xin , Liao La Mei
Published: June 2012

To study the spectrum of lithium plasma, the resonance escape factors of three resonance absorption lines that making up the LiⅠ671nm line are discussed theoretically, for both Lorentzian profile and Voigt profile. The number density of the absorbing atoms in the ground state, the oscillator strength, and the optical depth at the line center are also discussed in the calculation. The abundance of lithium relative to hydrogen is evaluated.The results we calculated are in good agreement with the experimental results. This calculation will be significant in the research of plasma lithium plasma.
Synthesis and Characterization of a Novel Folate-Conjugated Themoresponsive Micelles
Authors: Jin Jing , Xue Jian Peng , Cui Si Si , Cao Jie , Zhang Dong Yin , Gu Yue Qing
Published: June 2012

In this study, a amphiphilic copolymer, poly ((N-isopropylacrylamide)-co-acrylamide-co- (octadecylacrylate)-co-(Falate-(polyethyleneglycol)-(acrylicacid)))(P(NIPA-co-AAm-co-ODA-co-FPA)) micelles was synthesized by free radical random copolymerization. The obtained amphiphilic copolymers were self-assembled into micelles, which exhibited thermally sensitivity. LCST of the micelles was detected by uv-vis spectrophotometer. The diameter and morphology of micelles were determined by laser particle size analyzer (LPSA) and transmittance electron microscope (TEM), respectively. The micelle with a diameter of 60 nm and LCST of 40 oC was obtained by utilizing of ODA and the feed ratio of NIPA and AAm, respectively, which is satisfied for drug delivery in living body. The maximum DLC was achieved with the amount of ODA (180mg).
Escape Factor and Transition Probabilities of Plasma Mg II 280nm Line
Authors: Xiong Guo Xin , Zhao Hong Ying , He Jian
Published: June 2012

To study the spectrum of magnesium plasma, the escape factors and transition probabilities of two resonance absorption lines that making up the MgⅡ280nm line are discussed theoretically, for both Gaussian profile and Lorentzian profile. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed also. The results we calculated are in good agreement with the exerimental results, and some useful conclusions are drawn. This calculation will be significant in the research of plasma spectrum of magnesium plasma.
Adsorption Kinetics and Isotherms of Cu (II) and Cd (II) onto Oxidized Nano Carbon Black
Authors: Liu Yu Zhen , Cheng Jie Min
Published: June 2012

A new kind of sorbent, Oxidized Nano Carbon Black (OCB), was prepared with the acid potassium permanganate. The adsorption kinetics,isotherms of Cu (II) and Cd (II) onto Nano Carbon Black(CB) and Oxidized Nano Carbon Black(OCB) were investigated. The experimental data were analyzed by Langmuir, Freundlich isotherm, Pseudo first order equation and Pseudo second order equation. The results demonstrated that the Langmuir isotherm provided a better ﬁt to the experimental data of CB and the OBC fitted well into Freundlich adsorption isotherm. The adsorption capacity of Cu2+ and Cd2+onto oxidized Carbon black was significantly enhanced after modification. The maximum amount of CB was 16.129mg/g for Cu2+, 5.747mg/g for Cd2+, the maximum amount of OCB was 83.333mg/g for Cu2+, 10.3097mg/g for Cd2+, respectively. The Freundlich parameters of OCB were KF, Cu = 0.360, nCu = 1.16, KF, Cd = 1.777 and nCd = 3.086. The values of n > 1 indicated a favorable adsorption process. The study of adsorption kinetic showed that the adsorption stage of Cu and Cd onto sorbents could be divided into two stages: fast reaction and slow reaction. The adsorption kinetic model of metal on OCB followed pseudo second order model well (RCu2=0.985, RCd2=0.987) and the data of CB fitted pseudo first order model well (RCu2=0.983, RCd2=0.998).
Magnetostriction and Hysteresis of Tbdyhofe1.95 Alloys
Authors: Zhang Hong Bo , Shen Fu Gang , Yang Tao
Published: June 2012

The crystal structure, Curie temperatures, spin reorientation temperature, magnetocrystalline anisotropy constant and magnetostriction of TbDyHoFe1.95 alloys with composition formulation (1-y)Tb0.36Dy0.64Fe1.95+yTb0.20Dy0.22Ho0.58Fe1.95 (0≤y≤1) were investigated. X-ray diffraction patterns demonstrate the TbDyHoFe1.95 alloys possess MgCu2-type cubic Laves structure. The Curie temperature Tc decreases slightly from 381 °C for Tb0.36Dy0.64Fe2 to 379 °C for y=0.3, 375°C for y=0.4 and 373°C for y=0.5. The spin reorientation temperature Tr increases from -94 oC for Tb0.36Dy0.64Fe2 to -70°C for y=0.3 and -51oC for y=0.5. The magnetocrystalline anisotropy constant K1 decreases with increasing y value. The magnetostriction was examined under applied magnetic field H (0
Double-Side Digital Display Devices Based on the Solid-State Electrochromic Effect of the Amorphous WO3 Thin Films
Authors: Luo Jian Yi , Chen Run Ming , Zhou Yang Yang , Chen Ri Mei , Deng Wei Yuan , Li Li
Published: June 2012

A double-side digital display device has been fabricated based on the solid-state electrochromic effect of amorphous WO3 thin film in this article. The device simply consists of a transparent anode, a transparent cathode, an amorphous WO3 thin film and a solid electrolyte. The transparent electric wiring has been achieved by the electrochemical corrosion of the designed region of ITO (indium tin oxide) film. The amorphous WO3 thin film as an electrochromic layer is prepared on the ITO film by thermal evaporation deposition. The complex of polyethylene and LiClO4 as a solid electrolyte is used in the devices. This double-side digital display can work well under the normal mobile phone battery of 3.7 V, which is compatible with the traditional driven circuit technology. Our results prove the potential application of the amorphous WO3 thin film on the double-side display devices.
AltBOC Receiver Design and Tracking Performance Analyze
Authors: He Wei Dong , Lu Xiao Chun , Chang Xiao Feng , He Cheng Yan , Rao Yong Nan , Wang Xue
Published: June 2012

The Galileo E5 signal is by far the most sophisticated signal among all the signals used for Global Navigation satellite system. Galileo receivers capable of tracking E5 will benefit from much better performance in terms of measurement accuracy and multipath suppression. Compared with traditional receivers for BPSK or even BOC signals, E5(AltBOC) signal processing techniques requires much more challenging due to the stems of the extremely large bandwidth and inherently complex correlations. This paper aims to present the receiving methodology and the architecture of tracking. The architecture of the tracking channel is discussed alongside with related algorithms and impact of code tracking jitter is evaluated finally.