bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Simulation of High-Speed Spiral Flow in Hydraulic Lifting System
Authors: Tang Jun , Gao Rui Jie , Hu Shu Wen
Published: April 2014

The high-speed spiral flow generator was designed, by which can produce strong suction and penetration and strong adsorbent spiral flow of manganese nodules, it can form a centripetal pressure field. In the field, the manganese nodules move to the center of pineline and effectively gather near the pipe center, so probability of manganese nodules collision with the pipe wall will be reduced and energy consumption discreases and capability and efficiency of the system will be enhanced. Secondly, Fluent software was used, through which the simulation test of hydraulic lifting was conducted, pressure field and velocity field were got. The results showed that high-speed spiral flow hydraulic lifting is feasible and rational.
Convergence Theory for Unified Discrete-Time RNNs with Quasi-Symmetric Connection
Authors: Mao Hui Zhong , Qiao Chen , Jing Wen Feng , Chen Xi , Mao Jin Qin
Published: April 2014

This paper presents the global convergence theory of the discrete-time uniform pseudo projection anti-monotone network with the quasi–symmetric matrix, which removes the connection matrix constraints. The theory widens the range of applications of the discrete–time uniform pseudo projection anti–monotone network and is valid for many kinds of discrete recurrent neural network models.
Fault Prediction Method of the Marine Gas Turbine Based on Neural Network-Markov
Authors: Cui Jian Guo , Zhang Long , Wang Gui Hua , Cui Bo , Jiang Li Ying
Published: April 2014

Since the fault of marine gas turbine is difficult to predict accurately, making the rolling bearing as the specific object, a fault prediction model of the marine gas turbine based on Neural Network and Markov method is built through the data analysis, preprocessing and feature extraction for the rolling bearing history test data. First, it uses the neural network method to realize the health state recognition of the marine gas turbine. Then, the fault of the marine gas turbine is predicted by taking advantage of the fault prediction which is based on the Markov model. The results show that the efficiency of fault prediction for the marine gas turbine can be realized better through the fault prediction model constructed in view of the Neural Network and Markov. And it also has a significant practical value in project item.
Friction and Wear Performances of Magnesium Alloy against Steel under Lubrication of Soybean Oil with S-Containing Additive
Authors: Fang Jian Hua , Xia Dong Yong , Chen Bo Shui , Wu Jiang , Wang Jiu
Published: April 2014

A S-containing additive, sulfuration modified soybean oil (named as SSO), was prepared by chemical modification of soybean oil with sulfur compounds. The friction and wear performances of AZ91D magnesium alloy against GCr15 bearing steel under the lubrication of rapeseed oil formulated with SSO were evaluated on a SRV tribotester. The topographies and the chemical species of the worn surfaces of magnesium alloy were analyzed by a scanning electron microscope (SEM) and an X-ray photoelectron spectroscope (XPS), respectively. The results indicated that the friction and wear of the magnesium alloy-steel tribomates could be effectively reduced by formulating SSO into rapeseed oil lubricant. The friction coefficients and the wear volumes of magnesium alloy decreased with increasing contents of SSO. The surface lubricated with SSO-doped rapeseed oil was characterized by less wear as compared with that lubricated with neat rapeseed oil. The enhanced anti-wear and friction-reducing abilities of rapeseed oil by SSO in the lubrication of magnesium alloy against steel were ascribed to the formation of a composite boundary lubrication film due to the strong adsorption of SSO and rapeseed oil onto the lubricated surfaces and their tribochemical reactions with magnesium alloy.
Design of Sweet Potato Vine Chopping and Returning Machine
Authors: Du Hong Wei , Han Zhong Zhi
Published: April 2014

Based on sweet potato vine creeping stems features and northern cropping patterns, this paper developed a sweet potato vine chopping and returning machine. It consists of pick-up mechanism, cut-off device, crushing device, ground wheel assembly and main frame etc.. The machine is attached directly to the tractor´s three-point linkage. It can complete vine picking up, cut-off, crushing and returning in one operation. The gear box which is made for turning and increasing speed is driven by PTO, and then drives cut-off system and crushing device individually. With the tractor forward, the vines was first picked up by the pick-up mechanism and cut off by the rotating disc of the cut-off device, and crushed by the crushing shaft with the help of the negative pressure caused by the high speed rotation of the crushing blade shaft.
Dynamic Simulation of a Two-Stroke Spark Ignition Free-Piston Engine Generator
Authors: Jiang Yi Tong , Wang Dao Jing , Liu Fu Shui , Zhao Shu Wei , Yang Qing
Published: April 2014

In order to study characteristics of a two-stroke spark ignition free-piston engine generator (FPEG), a dynamic simulation model which derives from several dynamic and thermodynamic equations is built in Matlab/Simulink . Simulation results show that: comparing to conventional engine, FPEG has advantages on efficiency andNOxemission level. By varying the moving mass, the compression ratio will increase accordingly while frequency keeps nearly constant. By varying ignition point, an optimum ignition advance is available in each case. At last, performance of free-piston engine generator under different fuel supply and load is predicted.
Experiment and Research of EDM Surface Modification of Titanium in Mist Medium
Authors: Hu Xiao Jun , Cai Lan Rong , Li Min , Huo Wen Guo
Published: April 2014

By AF1100-type EDM machine, graphite rod as a tool electrode, misted deionized water mixed with fine-grained C powder as working medium, the strengthening coating was prepared on the surface of TC4 titanium. The surface microstructure of strengthening layer was observed, the hardness and thickness of strengthening layer was tested, under different peak current, pulse duration, pulse interval and polarity. The results show that: At a current of 2.9A to 6.6A when using negative polarity to strengthen can get better strengthening layer organizational.
A Forecasting Method of Short-Term Electric Power Load Based on BP Neural Network
Authors: Bin Hou , Zu Yun Xiao , Zhang Chao
Published: April 2014

Described the meaning of the Short-Term Power forecasting firstly, then gives summary of the basic principles and steps of the power load forecasting, analyses the disadvantages of traditional forecasting methods, and proposing the load analysis plan base on BP neural network theory. Taking full account of the relationship between the daily load and weather factors, establishes a short-term load forecasting model. Results of the prediction are verified highly precise and stable, which makes it suitable for different forecasting conditions.
A Novel Flyback LED Driver Based on Primary Side Feedback without Auxiliary Winding
Authors: Han Zhi Gang , Xu Peng Cheng
Published: April 2014

A novel flyback LED drive based on primary side feedback without auxiliary winding is proposed in this paper. Photoelectric couple or auxiliary winding must be used to detect the current conducted through secondary side in prior LED driver system. But it causes insecurity isolation and both raises the manufacturing cost accordingly. The proposed voltage coupled network can estimate zeros crossing point of secondary current and sets the right time to turn on the switch MOS transistor after a delay time. And the current sense circuit is utilized to sense the current flows through the primary side, turning off switching transistor when the primary current rising up to a setting value. The proposed LED driver is suitable for discontinuous conduction mode (DCM). The experimental results verified theoretical analyses.
Red Mud Based Geopolymer and its Forming Mechanism
Authors: Fu Yong , Xiong Zu Qiang
Published: April 2014

In order to resolve the problem of hoarfrost in red mud, prepare a geopolymer with sintered red mud and calcined bauxite tailings and fly ash and lime and gypsum. In the geopolymer, sintered red mud is 30%, gypsum 10%, calcined bauxite tailings and fly ash and lime 20% respectively. The compress strength of the geopolymer is 15.438MPa, as strength as a brick. It is a useful construction material for building road and filling stope and so on.
Design of USB2.0 Data Exchanging System Based on FPGA
Authors: Qian Hui Dan , Li Jin Cheng
Published: April 2014

For achieving high-speed and large-capacity data transmission between two computers, a data exchanging system is designed. With FPGA as the data transmission medium, the exchanging of command and data is implemented through the I2C channel and Slave FIFO channel of USB2.0 chip. The system design includes both hardware and software, which are respectively realized by Verilog HDL and C++. Two computers with USB Host interfaces are connected to the development board by USB2.0 transmission line, and then exchange data directly under the control of upper computer. The simulation results show that the system is practical, reliable and easily extensible.
Hierarchy Design of Digital System Based on EDA Technology
Authors: Zhao Hui
Published: April 2014

The hierarchy design method of digital system based on EDA is proposed through the design of digital frequency meter system in this paper. Firstly, it divides the frequency meter into different function module and Writes VHDL code to describe each module circuit. Then, it creates the schematic diagram of top circuit. Design input, compiled, logic synthesize and function simulation are accomplished use MAX+PLUS II. In the end, digital frequency meter is implemented in CPLD. The results show that the design method can greatly simplify the complexity of hardware circuit structure. Its characteristic is high reliability and strong flexibility.
Analysis of Dynamic Characteristics of Pile-Soil-Water Coupling Effect in Consideration of Large Span Cable-Stayed Bridge
Authors: Chen Wen Yuan
Published: April 2014

The effect of equivalent fluid and viscoelastic boundary form considering soil's effect on long span cable-stayed bridge dynamic characteristics are analyzed to consider the additional mass method. Through the analysis, some useful conclusions of considering the water after the dynamic characteristics of the structure change greatly, and with the increase of water depth, frequency gradually more and more small, decreased significantly are obtained. Considering the fluid, structure is not the same under static load internal force changes. The cable has little effect, but beam and tower impact significantly, such as the moment of the direction of Z increased by 272%, so, the action of the fluid must be considered.
Experimental Studies of the Longitudinal Flexibility of Balloon-Expandable Coronary Stents
Authors: Shen Xiang , Zhou Xiao
Published: April 2014

Stents are medical devices used in cardiovascular intervention for unblocking the diseased arteries and restoring blood flow. A setup for the measurement of the longitudinal flexibility of a coronary stent was developed based on machine vision technology. A crimped stent made by medical stainless steel thin-walled tube was tested with the setup. The results show that the bending deformation of stent includes two phases: the elastic deformation phase and the plastic deformation phase. The bending angle changed very little with the increase of bending moment during the elastic deformation. However, the bending angle changed significantly when a small moment was applied during the plastic deformation. In conclusion, the experimental setup can be used to study and compare flexibility of different design kinds of coronary stents and provides a convenient tool for designers to improve bending characteristics of new stents.
The Ammonia Leak Monitoring and Warning System Based on Wireless Sensor Network in Industrial Environments
Authors: Yang Guang Xue , Han Wei
Published: April 2014

In order to prevent the ammonia leak caused casualties incidents, this paper adopts ZigBee wireless technology to real-time monitoring of ammonia concentration. Equipped with MQ137 ammonia sensor in the terminal node, and the use of STM8 microcontroller collected the ammonia concentration data. The data will be transmitted to the coordinator through ZigBee. Using LabVIEW to design the monitoring interface of computer, and read concentration data through the serial port communication. When the ammonia concentration exceeds the preset value, the GSM module will send the location of leak in the form of short messages to staff. Through the reasonable arrangement of sensor nodes in ammonia production workshop, can effectively avoid the ammonia leak hurting the safety of people's life and property.
A Comparative Study of Fatigue Criteria for Engineering Application
Authors: Sun Nan Nan , Chiang Y.J. , Li Guo Xiang , Wang Yang
Published: April 2014

Combined together with the cyclic stress-strain theory and cumulative damage theory, a new fatigue life prediction model is proposed. Existing tensile-compressive fatigue models and the proposed new model are used to estimate the fatigue life of several kinds of metal and a comparison is made between the predicted results and the field-test data. The proposed new model is also applied to the strain spectra of several Diesel engine components. The new proposed stain-life equation is proved to be valid for the life prediction of materials and engine components.
Coloring Mechanism of Rare Earth Polishing Powder and Study of its Factors
Authors: Liang En Wu , Yi Shou Zhi , Wei Zhi Jie , Ren Li Hua , Fang Zhong Xin , Wang Xi Long , Wu Yuan Yuan , Zhang Xuan
Published: April 2014

The better appearance of LCD rare earth polishing powder, the better sales. High-performance polishing powder for LCD was synthesized by using NH4HCO3 subsidence method, with rare earth carbonate as starting material. Coloring mechanism of rare earth polishing powder was studied by using TGA, XRD and so on. Color of rare earth polishing powder was quantitative described with the values of L, a, b, R, and chemical composition had a great influence on it. The result showed that Ca, Mg, Zn, Mn, P, Fe, Cu had a great effect on the white color of rare earth polishing powder, and the color had regular changes with chemical composition, calcining temperature, calcining time. The result can control production of rare earth polishing powder based its color, and it has significant practical value to color control of rare earth polishing powder.
A Survey of Collision Detection
Authors: Man Ran Ran , Zhou Dong Sheng , Zhang Qiang
Published: April 2014

The interference and collision detection problem among objects is widely studied in graphics, simulation, animation and virtual reality technologic. In this paper, we proceed from the main solution for collision detection, analyzed from graphic space, bounding volume hierarchies (BVH), Particle Swarm Optimization (PSO) and parallel algorithm, summarized the research situation about collision detection in recent years. At last, we give several suggestions to improve the efficiency and reliability of the collision detection algorithm.
On Stereoscopic Machine Vision with Limited Horizons
Authors: Chen Yu Min , Wang Xiao Li , Zhang Chen , Meng Xian Min
Published: April 2014

This paper provides a path planning algorithm based on model that contains 3D vision data. Using this model and a six-legged platform, we propose that limited vision field should be considered in a path planning of 3D vision robot. We also give out a machine learning method to analysis a robot's obstacle capacity, and formed vector to measure it. Based on the model, we designed an algorithm that allow robot to navigate in 3D environment. Observation on its behavior proof that our algorithm and model will allow a robot to pass through random 3D terrain.
Feedback Linearization Control of Electric Arc Furnace System Based on dSPACE Simulation
Authors: Gao Yuan , Liu Xiao He
Published: April 2014

In this paper, the method of feedback linearization control based on dSPACE simulation for electric arc furnace system is discussed. With the linear feedback method of differential geometry dealing with non-linear part of electric arc furnace system, the controller was designed. Then the hardware-in-the-loop simulation system was built, and several simulations was done. Simulation results show that the feedback linearization control has better performance.
Study on Chemical Mechanical Polishing Removal Mechanism of Monocrystalline Silicon
Authors: Du Hong Wei , Chen Yan Ni
Published: April 2014

In this paper, material removal mechanism of monocrystalline silicon by chemical etching with different solutions were studied to find effective oxidant and stabilizer. Material removal mechanism by mechanical loads was analyzed based on the measured acoustic signals in the scratching processes and the observation on the scratched surfaces of silicon wafers. The chemical mechanical polishing (CMP) processes of monocrystalline silicon wafers were analyzed in detail according to the observation and measurement of the polished surfaces with XRD. The results show that H2O2 is effective oxidant and KOH stabilizer. In a certain range, the higher concentration of oxidant, the higher material removal rate; the higher the polishing liquid PH value, the higher material removal rate. The polishing pressure is an important factor to obtain ultra-smooth surface without damage. Experimental results obtained silicon polishing pressure shall not exceed 42.5kPa.
Design of Electronic Control System for Free-Piston Engine Generator
Authors: Wang Dao Jing , Jiang Yi Tong , Liu Fu Shui
Published: April 2014

Based on Infineon XC167, an electronic control system was designed for internal combustion free piston engine generator (FPEG). The displacement was output in form of 4 channel differential signal by Coaxial magnetic grid, so the signal processing circuit was designed, and the displacement signal can be trapped by single-chip micro-controller; according to the current displacement, the ignition pulse width and ignition position was calculated by the single-chip micro-controller, ignition pulse was output; the operation parameter was monitored and control parameter was adjusted by PC. The test results show that: modular design was introduced in the design of electric control system, and it monitors and controls the FPEG accurately, the control objectives are achieved.
Application of Fractional-Order PIλ Controller for PMSM Speed Control
Authors: Xue Wei , Lu Ya Li
Published: April 2014

Permanent Magnet Synchronous Motor(PMSM) is a multivariable, nonlinear system with strong couple. It’s sensitive to the parameters and load variations. To improve the system static, dynamic performance and robustness, the fractional-order PIλ control strategy is proposed. Compared with integer-order PI controller, the fractional-order PIλ controller achieves better control performance due to an extra adjustable knob λ. The simulation results show that the fractional-order PIλ controller can track the given speed quickly and accurately, and has better anti-interference with load variation.
Effect of Dichotomous Noise on Dynamics of Spiral Waves
Authors: Xu Li Jun , Yuan Guo Yong , Luo Zhen Cheng
Published: April 2014

This paper mainly researched the effect of dichotomous noise on the dynamics of spiral wave, provided a method to eliminate spiral waves by dichotomous noise. Spiral wave dynamics show regular changes under the action of dichotomous noise with noise strength, time correlation parameter, this rule change can be explained by spectral analysis.
A New Application of Kalman Filtering Algorithm Based on Interval Calculation in Navigation System
Authors: Wang Shan , Gu Cheng
Published: April 2014

In traditional Kalman filtering algorithm, the system noise and observation noise should be assumed as zero-mean Gaussian white noise, meanwhile need the state-space model and relevant references be given and accurate. However, the white noise is just an ideal noise model that doesnt exist in real environment. This paper analyzed the effect to filtering result from the statistical estimation in traditional Kalman filtering algorithm and brought interval calculation into traditional Kalman filtering algorithm, which based on the concept of interval and could improve the robustness of the system, decrease the error caused by the statistical estimation of noise model.
A Novel Multi-Service Passive Optical Network Based on the Wavelength-Division-Multiplexed Technology
Authors: Li Ping , Lan Zhen Ping , Wang Yu Ru , Lv Huan Lin , Zou Nian Yu
Published: April 2014

The simulation diagram of WDM-PON is proposed, utilizing DFB laser diodes as light sources, array waveguide grating as multiplexer for signals’ split and amplifiers as gain generator, respectively, to realize networking for both sending and receiving units. WDM-PON system with 128 branches service signals and transmission rate of 210Gb/s is finally simulated and the system performances are analyzed and discussed.
The Study and Application of Improved Micro-Genetic Algorithm Based on Cauchy Mutation
Authors: Chen Man Hua
Published: April 2014

Genetic algorithm is the intelligent optimization design method, but its calculation workload is great and its convergence is slowly. This paper presents an improved micro-genetic algorithm (referred to as μGA-BLX) to overcome the shortcomings. The μGA-BLX algorithm uses the BLX-α operator to enhance the search ability of the algorithm in crossover; the mutation introduced on the Cauchy mutation operator to enhance the population's variety and the explore ability of algorithm. It shows the validity of the algorithm through the planet gear transmission optimization results.
Study of Cluster-Footprint Analysis Testing Algorithm and System
Authors: Li Yan , Pan Nan , Wu Xing , Liu Chang , Liu Yi
Published: April 2014

The cluster-footprint left at a crime scene is one of the most common trace evidence in the field of criminal investigation. Through analyzing and calculating the plane footprint, the investigators can get some important feature information such as step size, age and height, etc. However, this way is difficult to apply to reality without any errors in the process of manual calculations. Information management is more complicated in the later, the efficiency is relatively low too. To solve above problems, a testing system is designed and developed to analyze cluster-footprint. This system is based on the LabVIEW platform, which can realize image acquisition, stride characteristics extraction, information management and so on. Actual analysis results show that this system can effectively achieve these functions, working accuracy and efficiency can meet requirements of criminal investigation process.
Diffusion and Oxidation Wear of PCBN Tool when Cutting Materials Difficult-to-Cut Based on Thermodynamics
Authors: Shao Fang , Wang Yu Ting , Zou Li Jing , Wu Yan Ying , Sun Dong
Published: April 2014

Cutting temperature always highly reaches over to 1000°C when high speed machining with PCBN tools. Diffusion of tool material element may have important influence on tool wear at such high temperature, the diffusion wear and oxidation wear have become the major wear mechanism. In this paper, the rules of diffusion wear and oxidation wear for PCBN cutting tools are proposed and analyzed based on thermodynamics theory. Dissolution concentrations in typical normal workpice materials of PCBN tool material at different temperature are then calculated. Diffusion reaction rules in high temperature are developed and analyzed using Gibbs free energy criterion. The machining tests were conducted using the PCBN tools at different cutting speeds of 50, 95,100 and 180 m/min, feed of 0.1, 0.2 and depth of cut of 0.1, 0.8, 1, and 1.5 mm respectively on PUMA300LM numerically-controlled lathe. It was found that the theoretical results were uniform with the experimental data; the results will provide useful references for tool material design and selection.
Simulation Research of Deuterium and Tritium Ions Motion in Accelerating Electric Field for Neutron Tube
Authors: Huang Ji Peng , Liu Gang , Qiao Shuang
Published: April 2014

The model of neutron tube accelerating system was established to research what the effect of neutron tube accelerating gap, voltage and size of accelerating electrode on trajectory of deuterium tritium ion with finite element simulation technology. Some useful conclusions obtained from the simulation results provide the basis for optimizing the neutron tube structure and parameter, which can make neutron yields of 50-mm-diameter tube in the order of 109 n/s and the stability is not more than 2%.
The Non-Newtonian Fluid in the Collision
Authors: Hou Lei , Zhao Jun Jie , Qiu Lin
Published: April 2014

This paper studies elastic-plastic material deformation in terms of Cauchy and PTT. It gives certain convergence to the equation analysis in the discrete finite element method; it reaches o (h2+Δt) under the certain step length. Then we carry on Three-dimensional numerical simulation by the high performance software LS-DYNA and the distribution of stress and strain curve is observed.
Precision Analysis and Control of the Mold Rapid Development Based on Reverse Engineering
Authors: Fan Jun , Wang Lei Gang
Published: April 2014

The precision control is the key technology for reverse development. Focus on analyzing the reasons of the error of the reverse rapid mold development, the factors affecting the precision of the mold reverse development through four stages which including reverse model, development & design, mold design, mold manufacture, are proposed. By the example, we can see that through distributing and controlling precision rationally, the accuracy requirement of the reverse rapid mold development can be met effectively.
The FEA Comparison of the Front Sub Frame in a Car between JDM2 Magnesium and Steel
Authors: Zhao De Biao
Published: April 2014

Application of new materials is one of the principal means of lightweight automobile. Magnox with high strength and stiffness, good casting performance, collision resistance, damping, shock-absorbing performance, recycling, and other characteristics, is ideal for automotive lightweighting materials. Analysis comparison is done for the original front sub frame between steel materials and JDM2 magnesium. By find out the problems of the front sub frame with JDM2 magnesium referring to the analysis results, the foundation is made for the redesigning of the front sub frame with JDM2 magnesium.
Dynamics Characteristics for Contact Surface of Machine Tool
Authors: Luo Wei Ping
Published: April 2014

A virtual prototype model of Machine Tool has been constructed by using the Pro/E software and the ANSYS software. Considering the effects of contact surfaces, dynamic analyses of Machine Tool are studied. The effects of contact surfaces on the dynamic characteristics of machine tool are studied. So that the purpose predicting and evaluating synthetically the machine tool dynamic performance without a physical sample can be achieved.
Dry Gear Hobbing Machining Experiment and Research on Process Parameters
Authors: Zhou Ji Lie , Sun Zhong Hao , Tan Qing , Xie Yue Cheng
Published: April 2014

Gear hobbing is a widely used method in industrial gear manufacturing. Dry cutting technology is introduced in this paper to verify the influences on process built on different process parameters. Based on the dry cutting technology, a new type of green manufacturing, a series of gear hobbing machining experiments have been conducted. The effects of different feed rate and speed under dry and wet circumstances were compared. According to the results, the process parameters of dry gear hobbing machining have been theoretically analyzed, which provides the guidance for the optimization of the process, and experimental and theoretical basis for further research.
Performance Analysis of Two Stage Compression Cycle with an Internal Heat Exchanger
Authors: Wang Hong Li , Jia Ning , Tian Jing Rui
Published: April 2014

With increasing of the evaporating temperature, the two stage compression cycle with an internal exchanger’s COP has an increasing trend. In addition, R744 achieves the highest COP, and the R12 achieves the minimum level. With increasing of the high pressure and the outlet temperature of the condenser, the two stage compression cycle has a down trend. In terms of the increasing intermediate pressure, the two stage cycle with different refrigerants has different performance: R12’s COP has a downtrend with the pressure changing from 1MPa-3MPa, the rest refrigerants all increased first, and then decreased. Except for R12, they all have optimal intermediate pressure.
The Research on Characteristics of a New Type of Marine Gas Turbine Exhaust Ejector Device
Authors: Sun Tao , Zhang Ming Fei , Sun Chang Jiang , Ma Zheng Wei
Published: April 2014

Marine gas turbine exhaust ejector device is responsible for reducing or eliminating the infrared signatures of exhaust system. In order to optimize the structure of exhaust ejector and shorten the cycle of research, it is essential to study the successful experiences on exhaust ejectors by scholars abroad. In this article two structure innovations were introduced: the nozzle structure changing from circular to rectangular and multi-stage diffuser, then a new type of marine gas turbine exhaust ejector was designed. Through simplifying the ejector model, numerical simulation was used to predict the characteristics of both the single-stage ejector and the multi-stage ejector. The result indicates the effects of structural parameters on the performance parameters. This research result has certain reference value for marine gas turbine exhaust ejector structure innovations and performance optimization.
Effects of Substrate Preheating on Microstructure and Interface Characterization of Al2O3-13% TiO2 Ceramic Coating Fabricated by Laser Cladding
Authors: Wang Dong Sheng
Published: April 2014

In this study, Al2O3–13 wt% TiO2 ceramic powders was perset on the substrate of a GH416 Ni-base superalloy by the squash presetting method and cladding coatings were fabricated by a fiber laser. Influences of substrate preheating on the microstructure and interface characterization of laser-clad ceramic coatings were investigated. The results show that the crack formation of the clad ceramic coating can be prevented by substrate preheating. In addition, substrate preheating is helpful to form a good metallurgical bonding between the coating and substrate. Clad ceramic coatings with dense structures, crack-free, low dilutions and good metallurgical bonding to substrate were obtained under the optimum processing parameters. The cross-section of the clad coating indicated three different microstructural regions, namely, fine equiaxed crystals at the upper region, columnar crystals in the middle region, and very fine equiaxed crystals at the bottom region.
Research on Coating Devices with Applied Technology in Magnetron Sputtering Regulated Switching Power Supply Design
Authors: Zhou Zhi Wen , Wang Cai Xia , Ma An Ren
Published: April 2014

Magnetron power supply is one of the most important components in coating devices in applied technology. Magnetron regulated power supply with high power and high efficiency is studied and designed on the basis of high-frequency switching power supply technology. The principle of the main circuit and control circuit design are introduced. A MATLAB simulating model is composed to study parameters and waveforms of the designed circuits. The hardware circuit and software program are designed based on simulation results. The adjustment and display of the output voltage and the output current of the power supply under different work modes are achieved with TMS320F2812 DSP system. Practical applications confirm that the designed power supply has good constant current control effect, high reliability and working stability.
Research on Lateral Stability of Tractor-Semitrailer Steering and Braking Based on Nonlinear Factors
Authors: Gao Hong Bo , Xu Hong Guo , Liu Hong Fei , Zeng Cheng
Published: April 2014

A 18-DOF tractor-semitrailer nonlinear dynamics model was developed to describe the travelling characteristics of tractor-semitrailer braking in the cornering, considering the related nonlinear factors on the vehicle such as load transfer, saddle and tire. On this basis, it was calibrated that vehicle simulation model is reliable through real vehicle test. It was further analyzed the effects on lateral stability such as saddle position, load, braking force distribution and inside/outside wheel braking force difference through simulation when tractor-semitrailer braking in a turn.
Preparation and Characterization of Plasma-Sprayed and Laser-Remelted Ni60/Ni-WC Coatings
Authors: Wang Dong Sheng
Published: April 2014

In this study, Ni60/Ni-WC composite coatings were first prepared by plasma spraying. Then, the coatings were remelted successively with a CO2 laser. The influences of laser power on the microstructural characterization and microhardness of the coatings were investigated. The results show that the defects of as-sprayed coating like lamellar stacking microstructure and pores were eliminated by laser remelting, and the remelted coating possessed a denser microstructure. With the increase of the laser power, the burning loss and dissolve of the WC particles is increased, while the dilution rate of the coating becomes large. The laser-remelted samples had higher hardness than the as-sprayed one. Laser power has a great impact on the coating and an optimized process parameter is helpful to achieve appropriate melting of WC particles, which leads to retain a high proportion of hard phase in the coating, good combination between the WC particles and Ni-base matrix alloy, and high microhardness.
Simulation Analysis and Structure Optimization of Steel Structure Climbing Formwork with Material Properties Used in the Large Angle Leaning Bridge Tower
Authors: Li Jian Ping , Ruan Jie , Tan Pin , Wang Xian Jun
Published: April 2014

Steel structure climbing formwork has been widely used in bridge pier and bridge tower, etc. But the design of 30 degrees slope climbing formwork design is rarely involved. The climbing formwork which in the upper surface of leaning bridge tower is affected by concrete buoyancy and the downside is affected by concrete gravity .That cause insufficient stiffness,deformation of the template,non-uniform cross-section of the bridge and large angle deviation which have great harm to the bridge quality .This paper which combined the construction project of Huaibei Xiangwang Bridge establish the mode of climbing formwork, then, import the mode to the Workbench14.5 proceeding simulation analysis. Getting the stress and deformation of the climbing formwork, check the strength and stiffness .Then optimize the structure of climbing formwork to ensure the stiffness and control the deformation of the template. The stress of downside climbing formwork after optimization is uniform and maximum stress is reduced about 30% .This paper provide a reference to the design of the climbing formwork used in the large angle leaning bridge tower.
Construction Methods on Mechanical and Material's Deformation Control during Assembling and Erecting Cup Type Transmission Tower
Authors: Hu Xiao Guang , Yang Jing Bo , Zhang Zi Fu
Published: April 2014

Take a 1000kV Cup-Type tubular steel test tower as research object, and it is the first one of this type used in heavy ice area. Research on the assembly load’s affect to tower structure was made. The process of assembling tower using suspend guyed pole was analyzed with Finite Element Method. Structures overhanging the tower body, such as cross arms and bracket of earth wire, could be assembled in different ways. The different affect to the built structure corresponding to different assembly method was researched. The objective is to make the deformation of the structure minimum. It was indicated that, reinforce the K-joint by cable and the deformation of structure reduced obviously. The reinforce method is simple and efficient, and ensure the cross arm assembling smoothly. It is avail to improve the assemble quality of the whole structure.
Preparation and Properties of Ag Nanofilms for Organic Solar Cells
Authors: Wang Ying Lian , Ye Jun Yao , Zeng Ren Fen
Published: April 2014

nanoAg island thin films with different thickness have been prepared by vacuum vapor deposition method on ITO substrates for organic solar cells. UV-Vis absorption spectrum and surface morphology have been studied by UV-Vis scanning spectrophotometer and SEM. The influence of different thickness nanoAg has also been discussed. The results show that, when the nanoAg thickness is 3.0 nm, the surface plasmon response is most obvious, the resonance absorption peak appears red-shift, the surface plasmon response could enhance optical absorption, photocurrent, fill factor and power conversion efficiency obviously. The research results provide theoretical guidance to optimize the design and increase the performance of solar cells.
Preparation and Study on the Properties of Expanded Perlite / Fly Ash Floating Beads Insulation Material
Authors: Du Chuan Wei , Li Guo Zhong , Li Xiao Long
Published: April 2014

In this paper, expanded perlite / fly ash floating beads insulation material was made of expanded perlite, fly ash floating beads, cement, fly ash and VAE emulsion by adding decent additives, like waterproof agent, in the pressure forming process. The effects of molding pressure, VAE emulsion content, fly ash floating beads content and waterproofing agent content on the properties of thermal insulation material were studied, and the internal microscopic morphology of thermal insulation material was observed by SEM. Besides, the related action mechanism was explored. The test results show that the optimum ratio as follows: molding pressure of 0.46 MPa, VAE emulsion content of 20%, fly ash floating beads content of 20%, waterproof agent content of 7%.
Heat Preservation Time on the Properties of Red Mud Lightweight Insulation Brick
Authors: Ma Long , Li Guo Zhong , Hu Ji Rui
Published: April 2014

The red mud lightweight insulation brick was prepared by the sintering process as red mud, fly ash, bentonite as the main raw material, adding a certain amount of pore forming agent and fluxing agent. The sintering heat preservation time of red mud insulation brick on the properties was studied. The red mud lightweight insulation brick damage fracture microstructure was analyzed using scanning electron microscope (SEM) and the sintering mechanism was discussed preliminarily. The results show that with sintering temperature of 1100°C heating for 180 minutes, the performance of thermal insulation brick is better. When the heat preservation time extends to continue, the performances of sample remain stable basically.
Research on Environment Materials with Progress on Regeneration of Active Carbon
Authors: Liu Xin Zhong , Huang Yong Jie , Cheng Ze Ran , Liao Wei
Published: April 2014

Now activated carbon has been used greatly in all walks of life, thus the regeneration of spent activated carbon is of great significance. The advantages and disadvantages of the regeneration methods of the spent activated carbon are introduced and discussed in this paper, mainly including thermal regeneration, chemical regeneration, electrochemical regeneration, microwave radiation regeneration, wet air oxidation and supercritical fluid regeneration etc. Then a new recycling method of the spent activated carbon is proposed.
Research on Environment Materials with NDIR NO2 Concentration Measurement by Soot Position Influence
Authors: Zhao Yan Jun , Gao Cheng Bin , Qu Bin
Published: April 2014

Environment materials play important role in our daily life. It includes so many types. NO2 is one of the most important gaseous pollutants and NO2 concentration measurement system is one part of the CEMS system. There have many NO2 concentration measurement methods and NDIR is used commonly. The received angle of the measurement light is gradually decreases while the distance between soot and the receiver becomes larger; so the true infrared light intensity is smaller than the theoretical infrared light intensity and NO2 concentration is less than the actual concentration. To reduce the soot position influence, soot position influence on NO2 concentration measurement using NDIR is studied. The influence of the different soot position is analyzed. The simulation results show that the different soot position can influent the NO2 concentration accuracy. The solution method on decreasing the soot poison influence is brought out and can improve the NO2 concentration accuracy.
Research on Environmental Materials with Complex Resistivity Dispersion Properties of Chrome-Contaminated Soil
Authors: Liu Hao Rui , Nai Chang Xin
Published: April 2014

The complex resistivity dispersion experiment of the soil with different water content and different chromic salt content is the base of the complex resistivity detection method which will be used for evaluating the field polluted by chromium residue. By the soil complex resistivity dispersion properties experiment in kinds of conditions, we find that complex resistivity amplitude, phase, in-phase resistivity and out-phase resistivity can be influenced by the water content and contamination content; but the complex phase and out-phase resistivity have the obvious dispersion properties. The experiment result shows that the complex resistivity detection technology based on soil dispersion properties can be used to evaluate the field polluted by chromium residue.
Recovery Value Metals from Mixed Spent Li-Ion Batteries
Authors: Liu Xin , Li Lin Yan , Zeng Fan Yun , Wang Xue Jun , Xu Sheng Ming
Published: April 2014

With the rapid development and wide application of Li-ion batteries, cathode materials containing value metals Co, Ni and Mn are blended by several kind of metal oxide presently for pursuing high safe stability and low cost. The composition of spent Li-ion batteries has become complicated and optimum leaching condition varied. In this paper, leaching process for the mixture of pure LiCoO2and Li (Ni1/3Co1/3Mn1/3)O2was studied. With an increase in component of LiCoO2in mixed materials, the optimum leaching condition varied as: temperature from 60°C to 90°C, H2O2addition amount from 0.54 to 0.75ml/g and liquid-solid ratio from 10 to 20. According to this result, a real mixed spent batteries materials was recovered by being leached in 2M H2SO4at temperature of 90°C, liquid-solid ratio 20 and 0.6ml/g H2O2added. The leaching efficiencies of Co, Ni, Mn, Li were 96.88%, 93.71%, 92.12%, 99.43% respectively. Cu, Al and Fe in solution were removed by precipitation and solvent extraction. Finally, Ni, Co, Mn were extracted by D2EHPA for separating with Na+and other impurities, which is used as a raw materials for preparation of cathode active materials in batteries.
Mechanical Design of Farmland Environmental Monitoring System Based on WSN and GPRS
Authors: Zhang Hui Ying , Lin Shi Wei
Published: April 2014

For practical problems in large-scale production of precision agriculture farmland conditions, a farmland environmental information monitoring system was designed based on WSN and GPRS. The system is consisted of sensor nodes, ARM gateway and the host computer. Through WSN and GPRS network, realizing the data transmitted to the monitoring center and Client (including mobile phones and Ipad,etc.) Software platform is built with NI Labview, achieved real-time monitoring of the farmland environmental. Test results shows that the system is stable, accurate measurement, flexible distribution and it has good practical value.
Research on Chemical Materials with Characteristic on Chemical Looping Combustion of Co-Doped Fe2O3 Oxygen Carrier with CO
Authors: Li Qu , Liang Jing , Long Dong Teng , Cheng Wei Liang , Dong Chang Qing , Zhang Jun Jiao
Published: April 2014

Co-doped Fe2O3 oxygen carriers reacted with CO were investigated in order to study the temperature effect on the redox characterization.Co-Fe2O3 were characterized with X-ray diffraction (XRD), BET and transmission electron microscope (TEM), which showed that the surface structure was regular, and the polymorph was stable. The TG (Thermo Gravimetric Analyzer) analysis indicted that, rational doping Co could enhance the reactivity of iron-base oxygen carrier reacted with CO under different conditions. Oxygen carrier with Fe: Co molar ratio of 1:0.1 had best reactivity. With the temperature increased, the reduction degree became deeper and the complete conversion time shortened. The reduction reaction Co0.1Fe oxygen carrier with CO was carried out step by step, and the entire process was divided into three stages, namely 344.7-391.0, 414.7-472.5 and 607.6-681.5°C.
Research on Biochemical Materials for Fructo-Oligosaccharide to Lubricate the Intestine and Move the Bowels
Authors: Ma Yan , Guan Chu Yu , Huang Guo Hui
Published: April 2014

According to different doses of fructo-oligosaccharide have different effect ions in intestines, using fructo-oligosaccharide to lavage the mice for 7d, the high doses group can increase the amount of bacillusbifidus. Continue lavaging for 14d, the medium doses group and the high doses group can increase the amount of bacillusbifidus notable, the high doses group can increase the amount of bacillusacidi lactici, reduce the amount of enterovirus, aerosis-bacterium. Further, to study the ink length, the character of feces, the first defecation time, the amount of feces, the weight of feces, the water content of feces. The result as follows: comparing the low doses group with the high group, the ink length, the first defecation time, the amount of feces within 5h, the weight of feces , the water content of feces all have not notable effects (P<0.05). Comparing the medium doses group with the model group, the ink length increase notable (P<0.05), increase the amount of feces (P<0.01) , the weight of feces (P<0.05) , and the water content of feces (P<0.05).Compare the high doses group with the model group, the first defecation time shorten notable (P<0.01), increase the ink length (P<0.01), the amount of feces (P<0.01), the weight of feces (P<0.01) and the water content of feces notable (P<0.01).
Research on the Chemical Materials of 5-Bromouridine 5'-β,γ-Dihalomethylenetriphosphates
Authors: Wang Cheng Jun , Gong Shan Shan , Sun Qi
Published: April 2014

Two β,γ-CX2-5-bromouridine triphosphates (X = F and Cl) have been efficiently obtained from 5-bromouridine 5′-phosphoropieridate via the activation of the P(V)-N bond with 4,5-dicyanoimidazole.
Research on the Chemical Material of P1-Stavudine-P2-Acyclovir Diphosphate
Authors: Gong Shan Shan , Sun Qi
Published: April 2014

A novel and efficient method for the preparation of P1-stavudine-P2-acyclovir diphosphate has been developed. Acyclovir phosphoropiperidate was prepared from a redox condensation with 2,2′-dithiodianiline/PPh3. Then, the coupling of phosphoropiperidate with d4T phosphate in the presence of 4,5-dicyanoimidazole as the activator afforded the desired asymmetrical dinucleoside diphosphate in high yield.
Research of Hydrogen Atom Penetration during the Phosphorization Process of High-Strength Steel
Authors: Song Yu Su , Zhou Li Qing , Chu Guang Zhe
Published: April 2014

The hydrogen residued process of the High-strength steel surface during the phosphorization process was studied. By the hydrogen permeation experiment, that penetration speed of the hydrogen residued in the metal surface were measured. The result of shows:the more hydrogen gas generated in the process of phosphorization,the more hydrogen atom inside the metal. That means the hydrogen embrittlement criticality of the High-strength steel were more fearful。Dense phosphorizing film always block hydrogen atoms to penetrate into the metal,So that cuold to reduce the hydrogen embrittlement extend of the steel in phosphorization.