bluuebunny/crossref_metadata_2025 huggingface dataset:
Luminescence Properties of ZnO:Eu3+ Red Emitting Phosphor Prepared by Precipitation Method
Authors: Jia Lin Yan , Shao Zhong Bao , Han Jun Feng
Published: May 2013

Zinc oxide doped with Eu3+ ions red emitting phosphors were prepared by precipitation method, and its luminescence properties were investigated. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectra. The ZnO:Eu3+ phosphors were obtained at 600°C by calcining precipitation precursor. These phosphors can be effectively excited at 465nm. In emission spectra, the strongest peak at 616nm correlating to red emission is due to the electric dipole transition 5D07F2 of Eu3+ ions. Eu3+ions replaced Zn2+ ions and occupied the non-centrosymmetric sites in the ZnO matrix lattice. The phosphor particles with narrow distribution range are approximately 100-200nm in size. The luminescence properties of ZnO:Eu3+ phosphor with 8 mol% doping concentration of Eu3+ is optimal.
Study the I-V and C-V Characterization of n-ZnO/p-Si Heterojunction
Authors: Chao Xiong , Ding Li Hua , Jin Xiao , Lei Chen , Yuan Hong Chun , Zhu Xi Fang , Yan Zhang , Zhou Xiang Cai
Published: May 2013

A type n conductance of ZnO thin film was deposited on the p-Si filim by magnetron sputtering Al doped ZnO ceramic target, and the ZnO/p-Si heterojunction was preparated. The photoelectric properties, charge carrier transport mechanism were studied by testing the I-V, C-V characteristics with illumination and without illumination. The results shows that there exists a good rectifying properties and photoelectric response for ZnO/p-Si heterojunctions, and can be widely used in photoelectric detection and fields of solar cells. As the conduction band and valence band offset in the ZnO/p-Si heterojunction is too big, the current transport mechanism is dominated by the space-charge limited current (SCLC) conduction at the forward voltage exceeds 1 V. The results suggest the existence of a large number of interface states in ZnO/p-Si heterojunction, and the interface states can be reduced and the photoelectric properties can be further improved.
Synthesis and Properties of Novel Hole-Transporting Materials Containing Triphenylamine and Bipyridine Units
Authors: Lv Hai Jun , Yu Yi Feng , Liu Lei , Chen Ai Bing , Hu Zhi Chao , Huang Kai
Published: May 2013

Novel hole-transporting materials (M1, M2) containing triphenylamine and dipyridine units have been synthesized and characterized. Two compounds have excellent solubility in common solvents. The optical, electrochemical and thermal properties of the materials were studied in detail. The results show that two compounds have green emission in dichloromethane, high thermal stability and proper HOMO levels. The properties of compounds M1 and M2 indicate that two compounds are candidates for the application in Organic light-emitting devices as hole-transporting materials.
Carbon Cloth Diffusion Layer for Fuel Cell Electrode
Authors: Zhang Xue Jun , Li Ya Dong , Tian Yan Hong , Wang Su Qing , Zhang Li
Published: May 2013

This paper has developed one way to produce flexible carbon cloth from artificial cotton cloth carbonized at 1000°C with using (NH4)2HPO4as impregnation agent and phenolic resin as modification agent. The effects of (NH4)2HPO4and phenolic resin on bulk resistivity, tensile strength, density, thickness and microstructure of the resultant carbon cloth were investigated. The results show that (NH4)2HPO4impregnation is helpful to increase the carbon yield of artificial cotton cloth and decrease the bulk resistivity. The fibers in the carbon cloth are bond by carbonized phenolic resin, leading to higher tensile strength and lower bulk resistivity. When mass content of (NH4)2HPO4was 5% and phenolic resin 54%, flexible and porous carbon cloth was prepared with thickness of 0.27mm, density of 0.34g/cm3, bulk resistivity of 0.06Ω·cm and tensile strength of 2.33MPa, which is promising materials for diffusion layer in fuel cell.
The Microstructure and Thermochromic Properties of La1-XSrXMnO3 Smart Materials
Authors: Xu Min , Fu Zhao Hui , Li Lin , Wang Jie Bing , Wu Chun Hua , Zhao Yin Zhong , Zuo Hua Pin
Published: May 2013

The La1-xSrxMnO3 materials have potential applications in thermal control systems of microsatellites. The microstructure of La1-xSrxMnO3 materials is very sensitive to the compound of Sr incorporated into it. In this paper, preparation process of La1-xSrxMnO3 compounds was explored. Ceramic sintering process combined with a conventional solid state reaction method was used to prepare various components of La1-xSrxMnO3。 Annealing temperature, time and doped ratio were controlled in the experiment. X-ray diffraction and Raman spectroscopy were used to analyze phase structure and crystalline. Thermal radiative properties were measured on a Calorimetric Emissometer at 175K～375K. These investigations reveal that microstructure of La1-xSrxMnO3 compounds are affected by Sr2+doping level(x).Thermal emissivity of La0.825Sr0.175MnO3 materials vary widely from 0.68 to 0.37, which can meet requirement of future space thermal design.
Effect of Cooling Mode on Properties of a Cast Zinc Alloy
Authors: Zhang Fei , Wan Jin Gui
Published: May 2013

In order to explore the best way of zinc alloy cooling, respectively adopting air cooling, water cooling, oil cooling and cooling in the furnace, to study its influence on the zinc alloy material properties. The results show that the oil cooling mode can improve the comprehensive properties of zinc alloy.
Use of Waste Tire Rubber Particles as a Part of an Aggregate Added to Thermal Insulting Mortar
Authors: Huang Da , He Xiang , Lin Hui Li , Sun Kai , Ye Qing
Published: May 2013

Effect of waste tire rubber particles (WTRP) and glazed hollow beads as an aggregate on mechanical properties and thermal conductivity of thermal insulting mortar was studied. Several mortar mixtures were prepared by keeping the accumulated volume of both WTRP and glazed hollow beads equal to 1 m3and by using WTRP contents of 0, 125, 250, 375 and 500 (its accumulated density) kg/m3respectively. Results indicate that dry bulk densities of the mortars containing WTRP are all less than 900 kg/m3. The mortars or the WTRP have a certain hydrophobic property. The 28 d compressive strengths of the mortars are 1.4~2.0 MPa. And the thermal conductivity values are 0.095~0.139 W/(m.K) increased with the WTRP content increasing. The results suggest that the mortars containing WTRP as a part of an aggregate can be used as thermal insulating material.
Effects of Clay on Flow Properties of Polycarboxylate Superplasticizer and its Control Measure
Authors: Liu Xiao , Wang Zi Ming , Wu Hao , Li Hui Qun
Published: May 2013

Polycarboxylate superplasticizer (PCE) was usually sensitive to clay in mortar or concrete. The flow properties of cement pastes and mortars for PCEs with either kaolin or bentonite were studied systematically. The results showed that bentonite had a stronger influence on PCEs performance than kaolin, even no fluidity when bentonite dosage was more than 2%. The adsorption amount of bentonite on PCE was about 5-10 times more than that of kaolin, and PCEs adsorption on clay was proportional to its sensitivity to clay. The influencing mechanism of clay on PCE was analyzed from the structures of kaolin and bentonite and their adsorption characteristics between interlayer. The result of exploring control measure showed that adding the synthesized pre-adsorbent can effectively inhibit the effect of clay on PCE and ensure its workability.
Effects of Ferrocement in Strengthening the Serviceability Properties of Reinforced Concrete Structures
Authors: Khan Sadaqat U. , Nuruddin M. F. , Ayub T. , Shafiq N.
Published: May 2013

The aim of this paper is to investigate the serviceability performance of RC beams strengthened through two Ferrocement strengthening techniques as Cast in situ Wire-mesh layers and precast Ferrocement Laminates. To assess the effectiveness of these strengthening techniques, eight (08) RC beams have been intentionally designed and detailed as a tension-controlled section and tested under two-point loading up to service load of 40 kN. Then, beams were strengthened by Cast in situ Wire-mesh layers and by precast Ferrocement Laminates. Experimental results in terms of stiffness have been compared within and across the groups to assess the effect of variation of development length and no. of wire-mesh layers.
Study on Crack Spacing and Width of Expansive Soil due to Evaporation
Authors: Wu Jun Hua , Yang Song
Published: May 2013

The expressions of crack spacing and width were deduced from the aspect of force-balance. The concept of maximum spacing and width of crack were put forward accordingly and they were verified and consistent with the site test results. Their relationships with soil parameters were discussed in detail. The new cracks do not appear until the spacing of adjacent cracks is greater than the maximum spacing, and the width of cracks will not be greater than the maximum width. The maximum spacing and width are judgments for describing and represent the final characteristic of cracks due to evaporation.
Study of Thermal Stability of Magnesium Alloys
Authors: Turnova Zuzana , Chrebet Tomas , Turekova Ivana , Balog Karol
Published: May 2013

Today, magnesium (Mg) alloys are recognized alternatives to iron and aluminum to reduce the weight of structural materials. This contribution was performed to provide information on the flammability of magnesium alloys through investigation of the ignition temperature of selected Mg alloys. The test was performed in a muffle furnace with dynamic heating program. Also were performed tests of chemical composition of studied specimens.
The Inspiration from the Slow-Traffic and Lingering Characteristics of the Inhabited Bridge
Authors: Yang Chun Xia
Published: May 2013

The Inhabited Bridge combines bridge and building, integrating with abundant functions, attracting people to linger on it. It shows a striking contrast to modern bridges which mainly serve fast traffic. Through historical retrospect and analysis of characteristics different from modern bridges, this article points out that the present bridge construction should make progress on four aspects: satisfying slow-traffic people, compounding various lingering functions, creating water-seeing open spaces, and harmonizing with environments.
The Studying of Reinforcement Mechanism of Fully Grouting Rock Bolt in Brittle Wall Rock Mass
Authors: Zhu Xun Guo
Published: May 2013

The bolt’s load transfer differential equation has established according the stress equilibrium in a small section of a bolt and load transfer mechanics. And according the rock mass deformation before and after bolt assembling, the rock bolt’s load transfer equation has gained. In this paper, from later researching achievement, the radial displacement function of brittle wall rock for tunnel is gotten. And combining the radial deformation of tunnel wall rock mass, the axial force and friction resistance of rock bolt have gotten in brittle wall rock mass. Through analyzing the stress distribution feature and stress distribution tendency and affection factors, the affection factors to anchoring results is the dilatancy angle. And through the studying, it is show that the axial force and shear stress of rock bolt are bigger with the dilatancy angle increase
Unified Solution of the Ultimate Bearing Capacity for Stiffened and Thin-Walled Square CFST Short Columns under Axial Compression
Authors: Xu Jian Feng , Wu Peng , Zhao Jun Hai , Li Yan , Liang Wen Biao
Published: May 2013

Directed against the stiffened and thin-walled square concrete-filled steel tubular (CFST) short columns, the paper simplifies the square CFST columns into the circle ones by introducing the strength reduction coefficient of concrete and the equivalent constraint reduction coefficient. On the basis of the unified strength theory, the united solution of the ultimate bearing capacity for square CFST columns is deduced after considering the influence of strength-differential in tension and compression and intermediate principal stress. Some influencing factors are also analyzed in the paper. Through comparing the results of proposed formula with that of experiments of relevant literatures，the rationality of proposed formula is proved. The solution may provide theoretical references for the study of the ultimate bearing capacity for stiffened and thin-walled square CFST short columns.
Research on Dynamic Recrystallization Behavior of near-α Titanium Alloy during near-β Compression
Authors: Zhou Bing , Zhang Shang Zhou
Published: May 2013

The flow response and dynamic recrystallization of near-α Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd titanium alloy has been studied using isothermal hot compressive tests at strain rate of 0.01-10s-1in near β transus. The true stress-true strain curves hot-compressed in near-β region show a steady-state regime. The deformation is governed essentially by the β behavior. At strain rate of 10 s-1, the alloy exhibited plastic flow instabilities. Dynamic recrystallization can take place for the 0.06%C alloy.
Active Countermeasure Mechanism to Waste Dump Based on Spatial Effect
Authors: Teng Xiao Yan , Wang Hai Bin
Published: May 2013

Due to the difficulty of expropriation, dump technology is experiencing the tendency of higher bench, heavier dumping intensity and larger dumping equipment. Therefore, accidents of dump bench instability or general shear failure on foundation soar rapidly. The capacity decreases because of reducing the heap height, and the high cost would be unacceptable if the soft layers of foundation were strengthened or cleared up. The practicality of passive control measures, such as rockfill dams and retaining walls locating at slope toe is analyzed; the validity of catch drains is evaluated, based on the interacting characteristics between the waste dump and the foundation. The design principles, permission of deformation and moderate failure, are submitted with considering consequence to surroundings. Active countermeasure mechanism is established according to spatial effect, reasonably using dumping-site space and adjusting time-space relation during dumping.
From the National Historical and Cultural City of Shanxi DaiXian see Ancient Frontier Town History Culture and the Characteristics of the Development of City
Authors: Liu Yin Jia , Wang Jin Ping
Published: May 2013

one thousand years, in northern shanxi frontier area always all is the central and northern nomadic tribes for focus in urban construction, also reflect the very strong frontier military defense characteristics, after the passage of time, which also gives birth to the frontier town of shanxi unique frontier fortress culture. Based on the national historical and cultural city led by general layout, DaiXian city as an example, from its natural environment, history, military defense, ancient city pattern and architectural characteristics of shanxi discusses ancient frontier town history culture and the characteristics of the development of city.
Research and Application of Corundum Based Self-Flowing Castable Refractories
Authors: Wei Jun Cong , Liu Shu Xian , Zhang Hui Min , Yu Li Xue , Tu Jun Bo
Published: May 2013

The effects of different deflocculants, fume silica, reactive micro-alumina powder and high alumina cement on the flowability of corundum based self-flowing castables were investigated using brown corundum as the main starting materials. The behavior of the castables was evaluated according to the self-flow value of the castables. The results showed that the best self-flow characteristics of corundum based self-flowing castables is obtained using sodium hexametaphosphate as deflocculant, suitable amount of alumina micropowder, fume silica, and high alumina cement as binders. The resultant castables were successfully used in the bottom of a refining ladle with capacity of 80 tons. The service life could match that of well blocks and meet the production requirements.
Alloy Design and Application for Avoiding Carbide Network of CrWMn Steel by Phase Equilibrium Thermodynamic Method
Authors: Ma Yong Qing , Zhang Xiao Jing , Liang Yu Fen
Published: May 2013

By the equilibrium phases of the steels with temperature, the causation of being carbide network of CrWMn steel frequently in the manufacture was analyzed, and an alloy design for avoiding carbide network of CrWMn steel was researched. The analyse and research show that in austenite area the boundary precipitation of M3C and M6C carbides during cooling process after forging or hot rolling is preferential origin of carbide network, and in later ferrite area the precipitation and congregation of the carbides should lead on network aggravation. When CrWMn steel adding 0.3~0.4Mo as supplement, in austenite area M3C carbide disappears and M23C6 carbide increases, and it is conceivable of lightenning congregation to austenite boundary as the transformation of M23C6 and M6C reciprocally, and the distribution of diversified carbides should become fine too. The practice results show that the carbide network of CrWMnMo0.35 steel is avoided under normal forging or hot rolling conditions, and the hardness after quenching at 850°C and tempering at 200°C is HRC62~63, which is agreement with alloy design forecast. The experiment and application show that the performance of CrWMnMo0.35 steel is better than that of customary CrWMn steel for machinery knives.
The Finite Element Analysis of Thin-Wall Ribbed Square Steel Tube Recycled Concrete Bias Column Mechanical Properties
Authors: Li Yue Hong , Li Bai Shou
Published: May 2013

In order to study ribbed thin-walled square steel tube recycled concrete eccentric compression column, used the mechanical properties of ANSYS software, conduct the nonlinear numerical simulation. The analysis of the ribbed and ribbed, recycled coarse aggregate replacement ratio and eccentricity, three factors on the eccentric compression column mechanical performance, proved the thin-walled square steel tube that recycled concrete composite column the effectiveness of three-dimensional finite element simulation. The result shows that: when aggregate replace rate was 0%, ribbed specimen than not ribbed specimen axial displacement and displacement to the reduced to 5.77% and 2.33% respectively. When the aggregate replace rate was 50%, ribbed specimen than not ribbed specimen shaft voltage and bias displacement has been reduced by 6.53% and 4.22%; When the aggregate replace rate was 0%, ribbed specimen than not ribbed specimen axis pressure bearing capacity and bias the bearing capacity increased by 1.21% and 2.74%. When the aggregate replace rate was 50%, ribbed specimen than not ribbed specimen axis pressure bearing capacity and bias the ultimate bearing capacity increased by 1.04% and 2.82%.
Effect of Argon Gas Flow on the Thermal Field in a Directional Solidification System for Multi-Crystalline Silicon
Authors: Ma Xiang Rong , Zan Wu , Zhang Xin Liang
Published: May 2013

Directional Solidification System (DSS) is the commonly used casting station in the solar industry. In order to better understand the casting process, we carried out global simulations of heat transfer to investigate effect of argon gas flow on the thermal field in a directional solidification system for multi-crystalline silicon (mc-Si). The effect of argon gas flow on the global heat transfer and the melt convection are investigated. It was found that the heat transfer at the melt free surface due to the gas convection can not be neglected, though the argon gas flow contributes little to the global heat transfer at most radiative surfaces.
Studies on the Electrochemical Behavior of Sio/C Anode Materials by AC Impedance Method
Authors: Wang Jing , Tian Jia Ming , Wei Jun Cong , Wang Chun Mei
Published: May 2013

SiO-based materials as a new anode material has attracted widespread attention in lithium-ion battery industry for their high theoretical specific capacities. In this work, the SiO/C composites were prepared by a modified stöber method with TEOS and organic compounds (epoxy resin and sugar) as raw materials. The electrochemical performance of the prepared SiO/C composites were investigated by electrochemical charge/discharge tests and AC impedance method. As carbon source, epoxy resin can make the SiO/C composite with a higher specific capacity and stable electrode structure during charge/discharge process. The EIS results reveal that the SiO/C composite electrode derived from epoxy resin exhibits a higher lithium ion diffusion coefficient.
Influence of Einzel Lens Structure on the Performance of a Microcolumn Fabricated through MEMS Technology
Authors: Suwal Om Krishna , Sharma Anjli , Lee Young Bok , Oh Tae Sik , Kim Dae Wook , Kim Ho Seob
Published: May 2013

Microcolumn, a miniaturized electron optical system, is a powerful tool in manipulating electron beam for maskless direct e-beam lithography and miniaturized low voltage SEM for surface inspection, testing, and metrology. The basic parts of microcolumn are electron emitter, source lens, deflector, and Einzel lens. There are still several challenges in optimization of each component for better performance of microcolumn for aberration-free high quality imaging and large field of view. For the improvement of microcolumn, we developed a fabrication technique of making thin electrostatic lens using micro-electromechanical systems (MEMS) processes. Two types of microcolumns have been assembled by varying the spaces between Einzel lens-electrodes, and their performance have been evaluated for the comparison. The scan range is found to be increased with reducing the gap between the lenses and increasing working distance. The effect of the spatial gap on the scan range and image is analyzed through simulation study on the electric potential and field strength.
Mobile Sensor Navigation in Wireless Hybrid Sensor Networks
Authors: Lee Chao Yang , Lin Fu Tian , Yang Chu Sing
Published: May 2013

With recent advances in mobile platforms, hybrid sensor networks are becoming very popular technology. Mobile sensors can dynamically move to monitor uncovered areas and thus improve the coverage quality. Due to the obstacles may exist in the monitor fields, mobile sensors need to find an obstacle-free moving path for mobile sensor movement. However, in practical, sensors are difficult to obtain the geographic information of obstacles. Additionally, sensors have resource constraints. Hence, this work proposed an obstacle-free and geographic-free dispatch scheme (OGDS) for mobile sensor navigation with low computational complexity. The moving path for mobile sensor dispatch has obtained by using the Dynamic Source Routing protocol (DSR) protocol. Experimental results reveal that the proposed scheme can be efficiently executed.
Research on the Performance of P-i- n Type GaN Ultraviolet Photoelectric Detector
Authors: Sun Yuan Yuan , Liu Shi Bo , Ren Jia Yue , Zhong Yong Bing , Jia Qiu Rui
Published: May 2013

GaN ultraviolet photoelectric detecting technique has important application value in the spacecraft, fire monitoring, ultraviolet communication and other fields. In this paper, p-type GaN samples were obtained after rapid annealing of GaN mixing Mg at 700~800°C. Then, p-i-n type GaN ultraviolet photoelectric detectors were fabricated on Al2O3 substrates by metal organic chemical vapor phase epitaxial deposition method. The devices have better rectifying behavior which can be demonstrated by the I-V curve. The response time of the device is 1.6µs and its higher responsivity is 0.95A/W.
The Analysis on the Tracking Characteristics of Electromagnetic Sensor
Authors: Suo Chun Guang , Su Shi , Zhang Wen Bin
Published: May 2013

This paper presents the tracking characteristics of electromagnetic sensor. To the model of live wire magnetic field of the formula derivation, and analysis of height and horizontal distance of the electromagnetic sensor and magnetic field. Deduced from magnetic field model that the tracking characteristics of the dual-inductive electromagnetic sensor, to build a tracking model. According to the analysis of a large number of experimental data, experimental results have indicated that the tracking model was approximately linearly related to the horizontal distance.
Design of the Wireless Monitoring Unit for Underground Rail Vehicles
Authors: Xu Guang Long , Rao Jian Hua , Yang Ken , Wang Tao
Published: May 2013

A wireless monitoring unit is designed for underground rail vehicles (URVs) in fields of mining engineering and underground construction. The unit consists of transmitting subsystem and receiving subsystem which are connected by using radio-frequency (RF) technique. Transmitting subsystem acquires and transmits the real-time motion parameters and state of a URV. Receiving subsystem transfers the data to ground monitoring station by RS-485 bus based on Modbus protocol. The upper computer in ground monitoring station displays and stores monitoring results of the URV, which enables the staff to obtain the information of a URV in time. Test results prove that the wireless monitoring unit can work steadily.
Intelligent Turbine Flowmeter for Viscous Oil Flow Measurement
Authors: Xue Long , Sun Li Jun , Guo Su Na
Published: May 2013

Turbine flowmeter is significant, but the change of viscosity has a remarkable impact on the accuracy of the turbine flowmeter. Aiming at this problem, the experiment was carried out on the viscosity variable oil flow facility. New software compensation method for viscosity was put forward with the developed intelligent turbine secondary instrument. Firstly the viscosity was compensated, viscosity was regarded as independent variable, average meter factor was regarded as dependent variable, the polynomial was fitted; then the flow rate was compensated, flow rate was regarded as independent variable, the average offset between meter factor got by viscosity compensation and experiment was regarded as dependent variable. The polynomial was fitted, the sum of results of two functions was regarded as the final meter factor. The test demonstrated: with the software compensation the accuracy of intelligent turbine flowmeter changed from 8.0% to better than 2.3%.
Characterization of Body Movement for the Real Time Fall Detection Using Wireless Sensor Module
Authors: Kim Seong Hyun , Kim Dong Wook
Published: May 2013

As fall is an accident being taken place ordinarily to the elderly, it is important to prevent fractures as a result of fall by detecting fall behavior in advance. The objective of this study is to distinguish activity of daily life (ADL) from fall by using wireless sensor module. This study intends to determine fall status before the body contacts ground surface after the fall starts. In this study, natural fall and acceleration being taken place during ADL were analyzed by using tri-axial accelerometer, tilt sensor and bluetooth module so that the body will not be bound at the time of fall. Test was performed on a soft mattress so that subjects will not be injured during the test process and fall was induced through rapid movement of mattress by using a pneumatic actuator. A sensor for detecting body movement was attached to the back and waist of the subject. Fall status was determined by using acceleration value being generated from the body and direction of fall was judged by angle value. As a result of the test, in case of using this system, fall status and its direction could be correctly detected.
Rigid-Flexible Coupling-Based CNC Machine Tool Feed Drive System Co-Simulation
Authors: Zhao Da Xing , Yang Yong , Xu Wan , Ding Guo Long , Peng Ling
Published: May 2013

High-speed high-precision CNC processing technology plays a very important position in the CNC machining industry,machine disturbance,however,an important factor affecting the machining accuracy,the ball screw feed drive as an important part of the machine directly affects the operating characteristics of the machine.Ball screw drive system,Solidworks,Ansys,Adams the establishment of machine tool,rigid-flexible couping the multibody dynamics model,the dynamic characteristic curve of the machine.Compared with the rigid body model simulation results verify the feasibility of rigid-flexible coupling modeling method,optimized to provide the basis of the structural design of the machine components.
Measurement of Diesel Nozzle Geometry with X-Ray Phase Contrast Imaging Technique
Authors: Yan Yi , He Zhi Xia , Zhong Wen Jun , Jiang Zhao Chen , Fu Ya Nan
Published: May 2013

Diesel spray characteristic s is affected by nozzle geometry and then influences the subsequent combustion and emission, so it's important to get the detail nozzle geometry dimensions. In this paper, the X-Ray phase contrast imaging technique was proposed to measure the nozzle geometry. With X-microtomography technique and three-dimension reconstruction technique, the internal structure of nozzle is constructed. The non-destructive measurement was performed and the detail structure of nozzle was got.
Fault Diagnosis Method for Marine Engine System Combined with Multiple Clusters Using Label Propagation
Authors: Zhang Ai Ping , Ren Guang , Jia Bao Zhu , Lin Ye Jin , Zhang Jun Dong
Published: May 2013

Fault diagnosis for marine engine system can be achieved by cluster process. We propose a multiple clusters method using label propagation model repeatedly to cluster for fault samples. Due to randomness in label propagation, some classes which are not easy to be found in single cluster can be found. To verify the performance of this method, the samples from self-manufactured marine engine room simulator are used in fault diagnosis simulation experiment. Both fault analysis results and fault diagnosis results are completely correct, and fault pattern which is not in fault history data can be recognized.
A Finite Element Analysis for Grasping Sand Force of Grab-JDPA8D
Authors: Xin S.Q. , Jiang J.G. , Luo L. , Zhao F.C. , Li J.
Published: May 2013

Taking the sand grab bucket for example, the motion and force situation of the grab mechanism is analyzed with the software SolidWorks. First 3-D model of the grab mechanism was built, second finite element model of grab was built, finally motion and force analysis was carried out with post-processing module. The instance study shows, finite element analysis method based on SolidWorks Simulation helps to improve the quality and efficiency of product design in practice.The results will provide reference for design of grab bucket in future.
Particle Swarm Neural Network in Application of Soft Fault Diagnosis of Analog Circuit
Authors: Han Bao Ru , Liu Shi Xiang , Cai Li Sha
Published: May 2013

In order to diagnose single soft fault in analog circuit, the particle swarm neural network was applied to fault diagnosis of analog circuit. The particle swarm neural network training process was divided into two steps. Firstly, BP network weights and threshold values as the position vector of the particle, used PSO algorithm searches for a near-optimal position vector as BP neural network initial weight values and thresholds. Secondly, used the BP algorithm to further optimization based on the initial weights and thresholds, got the optimal network weights and threshold value. The training method can improve the convergence accuracy and learning speed of the network training. The simulation results show that this diagnostic method can effectively achieve the accurate diagnosis of analog circuit soft fault.
Design of Multi-Channel Lithium-Ion Battery Test System
Authors: Cai Yong , Deng Ji Wei , Wang Tai Hong
Published: May 2013

At present, the Lithium-ion battery are the most used batteries in a large number of applications because of its high performances. It is important for Lithium-ion battery to make objective and accurate judgment to its performances before the practical application. A multi-channel high precision Lithium-ion battery test system, which could realize complex measure control, was designed in this paper. The system consists of upper computer (PC) and lower computer (control circuit unit). The communication between upper computer and lower computer is through RS-485 bus. The control circuit unit, which is mainly composed of micro-processor, control circuit, data acquisition circuit and protection circuit, can realize the function of testing Lithium-ion battery performances such as charging, discharging, internal resistance. Furthermore, based on actual use conditions it has shown that the system can accurately measure various Lithium-ion performance parameters and the current measurement accuracy can satisfy the test requirements.
Study on Oil Pipeline Leakage Detection Based on Stress Wave Detection Technique and Wavelet Analysis
Authors: Zhang Jie , Guan Xiao Dan , Sun Yan , Wei Xue Jie
Published: May 2013

Based on stress wave detection technique and wavelet analysis, oil pipeline leakage detection system is designed. Through vibration sensor put on the pipeline, vibration signal of pipeline is collected. The signal is used to preliminary assessment with DSP processing unit within the system, and then the feature of threat events is extracted. The information is uploaded to the centre of security central station of system by GPRS signal. At this, signal wavelet analysis is done for leakage detection. Based on LabVIEW platform, on oil pipeline leakage monitoring interface, threat events is alarmed and shown in electronic map and the system is convenient for staff to handle with. With the test, recognized police rate of system is superior to 85%, rate of false alarm is 15% below. All knocking signal of pipeline is given right alarm information. The noise by people walk, car, wind and rain is effectively filtered.
An Analytical Method of Time Character of Electron Beam Current Density on Transmission Electron Microscope Imaging
Authors: Zhang Xiu Yan , Dong Quan Lin
Published: May 2013

An analytical method of time character of electron beam current density is required for transmission electron microscopy (TEM) imaging research. By studying the imaging principle of TEM, the relational expression between current density on fluorescent screen and exposure time is deduced. The actual data of numerical relation between current density and exposure time are gained by the exposure experimentation with the master sample on the TEM test equipment. Furthermore, the parameter value in expression is computed by linear fit using the least squares method, and then the concrete relational expression between current density and exposure time about the TEM test equipment is obtained. As a result, using the concrete relational expression on the TEM test equipment, the automatic exposure experimentation on some samples is completed on the different operating mode, and the relatively clear-cut TEM images are formed. The experimentation results indicate that the automatic exposure method is correct and parameter calibration is valid.
Engine Knock Detection Based on Time-Frequency Images and Support Vector Machine
Authors: Li Ning , Zhou Rui
Published: May 2013

Knock is a major cause of pollution, parts damage and metallic noise in an engine. But slight knock can improve the power and economic performance of an engine. Therefore, existence and intensity of the knock are preconditions for the automatic knock control system to work. This paper describes an advanced approach solving the knock detection task. It is based on a time-frequency image generation solution followed by a support vector machine detection step trained in a constructive supervised way. The proposed method is applied to analyze the pressure signals measured from an engine cylinder to detect the knock based on the popular cycle-by-cycle classification. It is shown that this approach can qualify well for knock detection.
Research on the Construction Tower Cranes Group State Real-Time Monitoring System
Authors: Kan Feng Long , Wang Chang Tao , Zhao Lan Guang
Published: May 2013

Tower cranes are widely used in the course of construction machinery and equipment. In this system, tower cranes work more safely and stably, and the controlling system becomes more accurate, which is very vital to improve efficieney, aviod accidents and analyze fault.With the rapid growth and population of the wireless network technology, ZigBee wireless network technology by virtue of their low rate, low power consumption and low cost, has been widely applied in the fields of wireless sensor networks and automatic control. The real-time condition monitoring system of tower cranes based on wireless sensor network is studied in this paper.
Research on Self-Drive of Critical Conduction Mode Power Factor Correction Converters Based on Charge Pump
Authors: Geng Yu Ru , Gao Da Rong
Published: May 2013

The charge pump, which is used to realize self-drive in power factor correction (PFC) converters working in critical conduction mode, was studied in this paper. The charge pump was a RCD network made up of a resistor, a capacitor and a diode, and could be divided into three kinds of modality. The state equation of each modality and the connection between them was build, and theoretical waveform was figured. The design guideline in form of equations was also proposed considering the voltage variation and the time constant of the charge pump. Finally, a 200W prototype was build, and the experimental results matches well with the theoritical analysis.
Simulation of SPWM in Three-Phase Inverter Based on LabVIEW and Multisim
Authors: Su Shi , Zhang Wen Bin
Published: May 2013

This paper presents simulation of a three-phase single-level inverter. The inverter is designed to be fed into the power grid. State-space model and sinusoidal PWM technique are described in this paper. The simulation is based on Multisim and LabVIEW co-simulation. This method of SPWM simulation has some software and harmonic which must be taken into account while using it in the real power grid. Efforts are underway to improve the three-phase single-level inverter.
Parameters Optimization of Er3+ Doped Fiber Amplifier by Numerical Simulation
Authors: Liu Li Ying , Ma Yu , Yang Jiu Ru
Published: May 2013

The erbium doped fiber amplifier (EDFA) is one of the most important devices in the present optical communication and measurement system. However, the problem on parameters optimization of EDFA is always an open issue. Aim to obtain the output characteristics quickly and flexibly, in this article, we model the operation of an EDFA system by simulation. The numerical results show that the output spectrum of EDFA with various parameters. And through analyzing the performance in terms of gain, flatness and noise, the optimal pumping power and the length of EDF are determinate.
A Control Path Design of Communications Processor
Authors: Wang Guang , Gao Yin Sheng
Published: May 2013

With the widespread popularity of wireless mobile devices, the demands of emerging applications have been proposed, such as video telephony and HD video play. The next generation of wireless mobile computing devices needs to have higher data transfer rate, more complex algorithms, as well as low power consumption. This paper gives out a variable-width SIMD processor architectures controller and data transfer module designing method. The controller designing focused on controlling the program flow and initializing the data transfer module. By simulating the architecture on Xilinx ISE Design Suite, the fundamental modules have been designed and tested. The results of simulation verify the correctness of the controller and data transfer module design.
Dynamic Characteristics and System Loss Research of the Variable Frequency Hydraulic Decoupling Control System
Authors: Lei Peng , Gu Li Chen , Liu Pei Jin
Published: May 2013

In this paper, based on the nonlinear state feedback decoupling method, the dynamic transfer function of the inductor motor and pump control motor is setup, and the variable frequency hydraulic control system is realized to solve the contradiction between efficiency and dynamic characteristics using traditional control method. The simulation results show that this system has the better dynamic performance than VCS (Vector Control System). Then in order to optimize the system, the dynamic mathematical model including iron losses is built from the aspect of energy transmission. At last the condition of minimum loss of the system is deduced.
Study on a Kind of Electric Eddy Current Retarder Using in Working Condition Tailpipe Emission Monitoring
Authors: Kang Jie , Di Jian Hui , Kang Jin Peng
Published: May 2013

This article has introduced a new electric eddy current retarder by reducing radial size and increasing axial size of the eddy current retarder to meet working condition tailpipe emission monitoring.
Study on Application of Motion Control Technology
Authors: Wei Hong Ling , Jiang Wei
Published: May 2013

Motion control technology has become the key technology of mechatronics. This paper first introduces the general scheme of motion control technology, through the practical application of the system needs analysis, the development of specific technical implementations.
The Stereoscopic Parking System Equipment of Electric Vehicles and its Application Mode Research
Authors: Ye Qing Yu
Published: May 2013

In view of the current situation of the stereoscopic parking system for the electric vehicles and its overall development trend, we first research on its key module technology. Then, we research on its internal dynamic management pattern, the application mode of radio frequency identification (RFID), the application mode of charge management system and the application mode of control system. Thus, the popularity of electric vehicles is promoted by the stereoscopic parking system with intelligence, efficiency and saving of storage space.
Control of Permanent Magnetic Spherical Motor Based on Torque-Sharing Strategy
Authors: Li Gui Dan , Cao Jian Chun , Li Bin , Li Hong Feng
Published: May 2013

In permanent magnet spherical motor control system, in order to obtain control current of the stator winding, it is required to solve the generalized inverse of the torque matrix of high dimension, which increases the computational burden of the control system. To solve this problem, the torque-sharing strategy of double-pole structure of PMSM was discussed. The target torque was decomposed into the rotation torque and the tilting torque through comparing the torque component of different stator windings. The set of control winding is divided. Further, according to the torque characteristics of a collection of internal stator winding and rotor position, an energizing strategy of the windings was developed, and the rotation and tilt torque control matrix were obtained, and two dimensional reduction matrixes reduced the computational burden. On this basis, the dynamics model and electrical model of PMSM were established, and the control system consisted of position loop and current loop. Control torque was obtained by the calculation of the torque method, and control current was obtained by torque-sharing strategy. Simulation results show that the system is able to achieve independent control of rotation and tilt and track the desired trajectory.
Study on Motion Parameters of Tamping Operation
Authors: Zhou Tao Yong , Hu Bin , Yan Bo , Peng Yong Xin
Published: May 2013

Railway ballast tamping operations is an important work in the line maintenance and repair operations. The main goal is to restore the correct geometrical position of the railway track and improve the ballast compactness under the sleepers. Tamping parameters has a very important influence of tamping effect. This paper takes the type D09-32 tamping device as an example, introduces its structure and function, and analyzes its tamping principle of asynchronous constant pressure. The main motion parameters of tamping operation are gained by analyzing and calculating the motion of tamping tine.
VMAS Tailpipe Emission Monitoring Stations of Mobile Gasoline-Powered Cars
Authors: Kang Jie , Di Jian Hui , Fan Guo Yan , Jia Xiao Lei , Chen Nan Feng , Du Zhi Juan , Li Dong Mei
Published: May 2013

The emission testing equipment fixed on ground stationary vehicle can’t be used in moving vehicle, the question is that the radial size of the eddy current retarder is too big, so raising the detection table-board will cause that the detection vehicle can’t be in and out of the test bench. And the other question is how to protect the testing instrument and how to transport the instrument. By reducing the radial size and increasing axial size of the eddy current retarder (Keep the absorption power unchanged) reaches to reduce the height and the center of gravity of the detection table-board. By a box installed testing instrument, both sides of the panel can be open to the fold station as a lead plate in order to solve the problem that the detection vehicle can't pass in and out of test bench. The switch-type ceiling can open up when testing and pack up when transporting in order to be back from the rain. It reaches the goal that the whole testing equipment can be moved by using ordinary vehicle.
A Survey on Experimental Characterization of Hysteresis in Piezoceramic Actuators
Authors: Chen Wei , Qin Hai Chen , Yin Zhou Pin
Published: May 2013

In this paper, appropriate experiments were performed to explore the hysteresis in piezoceramic actuators under different excitations, and the experimental data were analyzed to describe the relations between frequency, amplitude and waveform of excitations, actuators temperature and hysteresis loops of piezoceramic actuators, based on maximum hysteresis error (MHE), peak-to-peak output amplitude (PPOA) and the ratio of MHE to PPOA (ROMP) of the curves. Finally, we proposed several advices on the use and research of piezoceramic actuators.
The Design of Regenerative Braking System with a Pedal Emulator
Authors: Zhang Shi Tong , Chu Liang , Yao Liang , Yang Yi , Zhang Hua
Published: May 2013

According to the regenerative braking system(RBS) with a pedal emulator as well as the control strategy. Design a hardware test platform of power regenerative system and the scheme of software experiment. Aim at the control strategy, braking safety and braking feeling of RBS with a braking pedal emulator is confirmed via hardware in loop (HIL) test. A high regenerative rate is obtained. From the result of simulation, the pedal force line from RBS with a pedal emulator is between the envelope curve of the pedal force from conventional vehicle. Actual wheel cylinder pressure can follow the change of target pressure very well. The regenerative braking rate reaches 53%.
Determination of TDC Using Digital Correlation Method for Linear Compressor
Authors: Peng Guo Hong , Tang Ming Sheng , Zou Hui Ming , Tian Chang Qing , Chen Xu
Published: May 2013

Moving-magnet linear compressors with sensorless top dead center (TDC) control method are an efficient solution for domestic refrigerators to save energy. TDC can be determined by the inflection point of phase difference between the sinusoidal current and piston displacement (I-Xphase difference). A digital correlation method is used to calculate theI-Xphase difference to obtain the TDC position for control. The TDC determining system using digital correlation method is manufactured and the error is 2.29% under various discharge pressures.
Design of Intelligent Auto-Tracing Robot Based on MCU Control
Authors: Tang Jian Wen
Published: May 2013

The design and implementation of intelligent auto-tracing robot based on MCU control technology are introduced. Camera is used in the robot for walking path automatic identification, controlling of walking along with the fixed line, stopping and steering.