bluuebunny/crossref_metadata_2025 huggingface dataset:
Promoting a Balanced Development of High Quality Teacher Resources with Network Technology
Authors: Xiong Caiping , Wang Xuejun , He Xiangyang , Yang Wenzheng
Published: October 2013

In China, the availability of high quality teacher resources varies from region to region and differs even among different schools in the same region. Two approaches were taken to solve this resource problem (i.e., traditional educational support and traditional instructional research). The former approach was attempted to relieve the shortages of high quality teacher resources in resources-poor schools by sending excellent teachers to assist in instruction and school management. The latter approach was intended to improve teachers’ teaching skills within resources-poor schools by conducting instructional research on the spot. However, both had little effect. What can be done to increase the availability of high quality teacher resources? What is the most effective way to improve the teachers’ teaching skills? How does one find new ways to solve the problem of imbalanced allocation of high quality teacher resources? These questions have puzzled the educational professional for a long time. This chapter introduces two innovated approaches to develop high quality teacher resources by using network technology. Network-based educational research approaches allow the teachers in resource-rich schools to teach the students of resource-poor schools through network video conference systems without leaving his or her own school. The network-based instructional research approach enables the teachers of both resource-rich and resource-poor schools to build alliances according to disciplines and to collaborate on instruction by network videoconference systems.
Interactive Boards in Schools
Authors: Daher Wajeeh , Alfahel Essa
Published: October 2013

This chapter examines middle school and high school teachers' use of interactive boards in the classroom, as well as the goals behind this use and the difficulties encountered throughout it. Ten middle school and high school science and mathematics teachers who use the interactive board for teaching science and mathematics were interviewed to elicit their practices, goals, and difficulties when using interactive boards in the classroom. The first two stages of the constant comparison method were utilized to analyze the collected data. The research findings show that science and mathematics teachers made different uses of the interactive board, which could be related to treating scientific relations, phenomena, and experiments, as well as practicing learned materials and engaging students in building activities in games and in discussions. Utilizing the different options of the interactive board, the participating teachers had various goals: giving students the ability to investigate, motivating them to learn, attracting them to the lesson, making them enjoy their learning, encouraging their collaboration, shortening the teaching time, and loading previously taught lessons. Using the interactive board in the classrooms, the teachers encountered some difficulties, such a: technical difficulties, owning the appropriate skills for using effectively the interactive board’s different options, preparing appropriate activities, fulfilling students' expectations, and keeping class order.
Design and Implementation of a Cognitive User-Support System for Skin Progress Analysis Using a Smart Phone
Authors: Nishiyama Hiroyuki , Mizoguchi Fumio
Published: October 2013

In this study, the authors design a user-support system employing a smart phone for skin progress analysis. The authors’ proposed system seeks to provide user support for a skin diagnostic service employing a smart phone's camera, with the user's photograph of a skin image and continuous diagnosis of the photographed area. The cognitive user-support module recognizes the processing and the user operation of the smart phone, and transmits advice on the operation to the user in real time, via voice or text messages. In addition, the cognitive user-support module can recommend contents suitable for the user, based on the user's past situation. In the skin diagnostic service, the authors’ system provides the user with auto photography when the picture is taken, by recognizing the user's situation and guiding the user via voice or text message. The authors’ system can recommend the skin area that was used for the last diagnostic service in order to perform continuous skin diagnosis. Using the authors’ system, the user can easily take a suitable skin picture and observe the skin care progress, so that in an esthetic room, the user and beauty therapist can verify the esthetic effect by viewing the pictures taken before and after treatment.
The Higher Order Circumferential Crack-Tip Field for Power FGMs Cylindrical Shell with Reissner's Effect
Authors: Dai Yao , Zhang Lei , Chong Xiao
Published: October 2013

The theory for plate and shell with Reissners effect is adopted to analyze the circumferential crack problem for FGMs cylindrical shell by using the asymptotic expansion method. The eigen-solution of the crack tip field for circumferential power type FGMs cylindrical shell which is similar to Williams solution is given.
Analysis of Pressure Distribution on Head Disk Air Bearing Slider Involved Van der Waals Force
Authors: Ao Hong Rui , Dong Ming , Wang Xi Chao , Jiang Hong Yuan
Published: October 2013

This paper focuses on the pressure distribution on the surface of slider in hard disk drive when its flying height is in nanoscale. The gas rarefaction effect and van der Waals force are involved in the analysis process. Here the air bearing force model is based on F-K model and we establish the equation of van der Waals force between the head and disk. Using the finite element method, the modified Reynolds equation and the van der Waals force were obtained. The air bearing force on slider before and after the van der Waals force involved were compared. The results illustrate that the effect of van der Waals force on the air bearing force is different according to the slider shapes and flying heights. As a result, van der Waals force plays an important role when the flying height of slider is below 10 nm.
Dynamic Analysis of Active Mass Damper
Authors: Gutiérrez Fredy Giovany Osorio , Acuña Hernán González , Lengerke Omar
Published: October 2013

This article presents a CAD design and analysis of the dynamics of a mass damper, used to reduce amplitude of vibrations in a high building. The mass damper dissipates the energy of earthquakes or strong winds on the top, thus avoiding structure damage, and preventing collapse.
Dynamics Analysis of Industrial Sewing Machine Frame Based on FEA and Modal Experiment
Authors: Zhang Li , Kai Chen , Wang Xue Jiao
Published: October 2013

The industrial sewing machine frame is one of the most important components of the sewing machine system, so studying its dynamic characteristics is particularly important. In this paper, based on the 3D model, the theory modal analysis of the industrial sewing machine is conducted with ABAQUS software and the modal experiment analysis is carried out through LMS(Lab Impact Testing system). The experimental results are in good consistency, which shows that the finite element model built in the paper is reasonable. This paper provides theoretical reference for vibration and noise reduction of the industrial sewing machine.
Simulation of Viscous Flow around Surface Ship Using ANSYS-Fluent CFD Code
Authors: Chen Shu Ling , Yang Song Lin
Published: October 2013

In this paper, numerical simulations have been carried out to determine the incompressible free surface flow around a Wigley hull form for which experimental results are available. A commercial viscous flow finite volume code using the two-phase Eulerian-Eulerian fluid approach has been used in this study. The simulation conditions are the ones for which experimental results exist. The shear stress transport (SST) turbulence model has been used in the viscous flow code. A structured grid was used with the viscous flow code for meshing the computational domain. The results compare well with the available experimental data, which make their complementary application useful for determining the total ship resistance.
Locating Error Analysis for Cartesian Positioner
Authors: Gai Yu Chun , Zhu Wei Dong , Ke Ying Lin , Yin Xiao Hong , Wu Jun Hao , Wang Wei
Published: October 2013

The structure and the operating principle of a Cartesian positioner are expounded. Based on the principle of multi-body system dynamics, the kinematic model of the Cartesian positioner is established. The deformation of each component is analyzed during the fuselage pose alignment by FEA(finite element analysis) . At last the locating error model is established. The locating error model can contribute to the stiffness distribution of components and the structure optimization of the Cartesian positioner.
Flow Field Research on an M-Beam Separator
Authors: Luan Yi Gang , Liu Na , Ma Zheng Wei , Zhao Zheng Heng , Pei Xiao Meng
Published: October 2013

The paper focuses on the resistance characteristic of a novel M-beam separator. Adopting the combination of experiment study and numerical simulation, we achieve that 2D simulation has the similar results as 3D in predicting resistance characteristic which provides the theoretical basis for next research. An M-beam separator model ten times larger than original one based on similitude principle was made for sake of flow field visualization research. The paper analyses flow field distribution of the amplifying M-beam separator by silk thread display technology and the experiment results are well consistent with 2D numerical simulation. The flow field distribution described here could serve as a reference for developing M-beam separator.
The Simulation of the Launching Process on Concentration Water Injection Launcher
Authors: Zhou Xiao Fei , Jiang Yi , Niu Yu Sen , Yu Shao Zhen
Published: October 2013

Simulation of the launching process in concentration water injection launcher, and get the parameter variations during the launch process, compared with traditional engineering algorithm, verify the reliability of the simulation results, given a new research method of interior ballistics on this launch system. This simulation has very important meaning for the temperature and pressure checking at the Beginning of the design. The simulation results show that,after the flow field stable,the average temperature and pressure in low-pressure chamber and the sabot are very close. This article uses the FLUENT software, use Mixture two-phase flow calculation model to solve the gas-liquid flow field, use the dynamic mesh and UDF program to simulation the flow field.
Development and Application of Optimal Software on Distributing Flow in Pumping Station
Authors: Zeng Hong Tao , Lin Lin Lin , Wang Zhi Xin , Tian Wen Gang
Published: October 2013

During the scheduling process of pumping station operation, under the premise of given net lift and flow of pumping station, distributing the flow of each pump unit in the pumping station, determining the optimal speed, unit commitment of the synchronous motor and induction motor, and the optimal flow of single-unit or vane angle, will make the operation cost of pumping station least. In order to meet these requirements, this paper provides a technical model of optimization design that distribute the flow of pumping station on period to make the cost least. The model is built based on dynamic programming, and by using applications of VB.NET and WPF, a set of software that meet the requirements is developed. The software runs well, calculates accurately, and has already been applied to Fankou pumping station, which has a good promotion value.
Dynamic Analysis of Multi-Supported Nonlinear Vibration Isolation System Mounted on Flexible Foundation
Authors: Huo Rui , Yu Hui , Guan Yan Feng
Published: October 2013

In view of its prototype in engineering application, a theoretical model of multi-supported nonlinear vibration isolation system installed on flexible foundation is studied, including derivation of system dynamic equations and analysis of system dynamic characteristics. For effectiveness evaluation of nonlinear vibration isolation systems, a generalized time-averaged power is proposed as an extension of classical theory of vibratory power flow, and a numerical solution method of time-averaged power is probed accompanying with the numerical solution of nonlinear dynamic equations. In a further concrete calculation example, an air spring vibration isolation system of a small UAV engine is numerically simulated based on Runge-Kutta method, and dynamic behavior and power flow transmission characteristics influenced by system parameters are investigated.
The Study on Five Order Hypernormal Form of Icing Suspension Cable Model
Authors: Hao Chen , He Bin , Li Jing
Published: October 2013

Suspension cable structure is one of the most important structure. In this article the hypernormal form of icing suspension cable model with practical application background is investigated by using the method of New Grading Function and multi-lie bracket. First the average equations of icing suspension cable model is given, based on the equations, the method in reference [5]and maple program are used to obtain the five order hypernormal form of the icing suspension cable model.
Equal Strength Continuous Sucker Rod's Optimization Design
Authors: Ma Jian Dong , Li Yu Xiang , Lin Shu Zhong
Published: October 2013

In this paper, through the plunger Department of the sucker rod to conduct stress analysis, get the force of the plunger department; then create a mathematical model in the general position, because resistance along the way, dead weight, friction forces and so on, the sucker rod from the bottom up force will show increasing trend, according to equal strength concept, analysis each section forces to calculate the iteration equation; using MATLAB simulation software, the calculated result as control variables to achieve the sucker rod's optimal design.
Dynamical Behaviors of a Four-Wheel-Steering System under the Sense of Mean Value
Authors: Huang Dong Wei , Wang Hong Li , Guo Yong Feng
Published: October 2013

In this paper, we establish a mathematical model on four-wheel-steering system subjected to white noise excitations and analyze the dynamical behaviors of the system under the sense of mean value. We calculate the Lyapunov exponents and estimate Lyapunov dimensions of the system. The results obtained demonstrate the existence of quasi-periodic orbit, and the simulations certify the conclusion of analysis. All the results showed that the four-wheel-steering system subjected to white noise excitations with weak intensity will move nearly steadily companied with tiny perturbation at not too high driving speeds.
Simulation Research on a Subsonic Flow around Plane Cascade
Authors: Cao Lei , Zhao Zheng Heng , Li Shu Ying
Published: October 2013

The paper deals with an analysis of a gas flow through two sets of plane cascade at various angles of attack (0 o, +20 o, -20 o) of different inlet Mach numbers (0.6,0.4, 0.2) by commercial CFD code FLUENT 6.3. Plane cascade aerodynamic research was performed with k-ε model and its flow characteristic was obtained. Its boundary separation and wake were observed. Then their influence factor and development characteristic were studied. Meanwhile, two sets of plane cascade are compared and their aerodynamic characteristics are analyzed.
The Honing Process for Precision Holes
Authors: Zhang Zhe , Dong Peng Min , Dong Zhao
Published: October 2013

To satisfy the mass, high efficiency production requirements, using the honing abrasive made from artificial iron fund diamond, honing the precision hole of parts made from HT250 cast iron. Introduce the honing processing technology, the honing processing equipment, process parameters, honing oil formula and processing results.
Analyzing the Contacting Stresses of Ball in Servo Disc Brake
Authors: Tian Jin Yue , Ren Zheng Ning , Wang Jin Wei , Yao Jin Yu , Lan Shi Xin , Zhou Ping
Published: October 2013

The ball's stress distribution in tractor servo disc brake usually is three dimensional in tractor. In this article,the contact theoretical analysis is used to calculate the contact face action distribution between the saddle ball bearings, the elastic displacement, train and stress distributed situation was determined in contact surface. The results show that the method is completely feasible, this method was suitable similarly for the solution contact stress question, the data has provided the important reference for the contact face optimization design.
Application of Periodic Boundary Conditions in Studying Stent Expansion
Authors: Jiao G.Y. , Li P.P. , Zhang R.J.
Published: October 2013

The stent is commonly used to support blood vessels to avoid blood obstruction. Its tubular structure is a combination of micro periodic structures. The stent is expanded uniformly due to its internal pressure during the implantation process until plastic deformation occurs. In this article, the simulation of a representative model with application of the proposed periodic boundary conditions is performed by using ABAQUS/Explicit package and Matlab code. To make a comparison, the entire model of the same type stent with general boundary condition is also analyzed. The numerical results show that the deformation and stress distribution calculated by the representative model is a little higher than those of the entire model, but their overall results agree well with each other. Therefore, the numerical results of the entire stent can be obtained by a simple geometrical tessellation of the deformed representative models. The advantage of this method is that it can significantly reduce the modeling and computing time for analyzing expansion of vessel stent.
Effect of Surface Conservation Law on Large Eddy Simulation Based on Seventh-Order Dissipative Compact Scheme
Authors: Jiang Yi , Mao Mei Liang , Deng Xiao Gang , Liu Hua Yong
Published: October 2013

This work investigates the effect of surface conservation law (SCL) on the high-order implicit large eddy simulation (HILES). The HILES is developed based on a seventh-order hybrid cell-edge and cell-node dissipative compact scheme (HDCS-E8T7). According to the test of flow over a cylinder, the flowfield of HILES may be contaminated by the SCL errors. Comparing with experimental data and other numerical results, reliable solutions are obtained by the HILES satisfying the SCL.
Process Parameters Control of Deposition of Hollow Cylindrical Part with Internal Wire Feeding through a Hollow Laser Beam
Authors: Wu Ming Jun , Shi Shi Hong , Fu Ge Yan , Liu Yu
Published: October 2013

A new inside-laser coaxial wire feeding processing is adopted that can ensure a good axiality between wire and laser beam through transmitting wire along the centerline of the laser beam. Basing on the optimization of process parameters and single beads cladding experiments, the causes of the uneven surface of the formed part is analyzed. By putting forward a method of the real-time control of the defocusing amount and the laser power, a fine multi-layer hollow rotary part is formed. The formed part has no subsidence damage and crack on the whole cladding layer. The size of the error is small and the hardness of the laser cladding is uniformly distributed.
The Plastic Deformation and Enhancement of 304Stainless Steel under Low Stress Repeat Impact
Authors: He Zheng Dong , Shi Jian , Fu Ge Yan
Published: October 2013

In engineering applications, many key components will fail with macroscopic accumulated plastic deformation, repeated impact loads, even though the stress is far less than the material yield limit. This kind of load can be called low stress repeated impact load in this study. It is observed that the plastic deformation of the material is mainly manifested in closer to the site from the collision surface. The strain decreases with the increasing depth from the surface, and it will be smaller and smaller with the increasing number of the impact. Finally, the strain tends to be stable, which means the material will no longer be deformed[1]. Take the method of preparation of the exponential gradient coating on 304stainless steel for performance enhancement, in order to satisfy and expand its application scope and conditions.
Detection and Identification of Different Metal Materials with Same Damage of Stretching Based on Acoustic Emission in Audible Domain
Authors: Lu Yun Tao , Deng Zong Bai , Yuan Ya , Xu Qing , Zhang Can
Published: October 2013

Analysis of metallic materials damage signal is effective for studying strength failure.Domestic and foreignscholars do much workbased on acoustic emission due to its real-time detection. Most researches are in ultrasonic region, few in audible domain. In this paper, taking low-carbon steel and cast iron as an example, we collected acoustic emission signals during tensile tests. Thenestablishassociated diagrams of processed signals, with multivariable parameter analysis used for eigenvalue processing. After normalizing data,wefigured out ranges of synthetic parameters. The experiment and calculation results show that eigenvalue of every low-carbon steel in one certain event is greater than cast iron’s. As a result,synthetic parameters canmake significant effect in detecting and identifying different metal materials
Optimization of Medium Components for β-Glucosidase Production from Aspergillus Niger by Response Surface Methodology
Authors: Zhang Chao , Huang Rui , Tian Hui , Zhao Ru Ming , Yu Fa Shun , Yao Juan , Gong Da Chun
Published: October 2013

β-Glucosidase is the key enzyme for the utilization of lignocellulose.But the commercial β-glucosidase can’t be produced. This paper focuses on the study of the β-glucosidase fermentation process.The fermentation medium components for β-glucosidase production from Aspergil lusniger was optimized by response surface methodology (RSM). Firstly, the three of the most important influence factors yeast extract, MnSO4•H2O and MgSO4•7H2O was obtained from Plackett-Burman design screening. Then the path of steepest ascent experiment was adopted to approach the optimal region of the medium composition. Lastly, the optimal concentration and mutual effect of three factors were predicted by RSM. The results showed that the best medium composition was Malt extract 18g/L, Yeast extract 3.22g/L, KH2PO4 3g/L, MnSO4•H2O 0.58mM, Tween-80 0.5mL/L and MgSO4•7H2O 0.23g/L. Under these fermentation conditions, the activity of β-glucosidase was up to 7.33IU/mL with increasing 23.2% than before.
The Study on Infrared Stealthy of Variable Emissivity Materials Based on the Radiation Contrast
Authors: Xia Ge , Yang Li
Published: October 2013

The infrared stealth coating with changeless emissivity is impossible to implement ships infrared stealth all the time. According to this characteristic, the range of target surface emissivity can be acquired from the calculation and analysis of target and background infrared characteristics with the radiation contrast should be less than 0.04. Using electrochromic materials to change the average emissivity of target surface in 3:5μm and 8:14μm wavelength can mainly meet the target infrared stealth all the time. It has a big improvement in the stealth efficiency compared to the infrared stealth coatings with changeless emissivity.
The Surface Quality Experimental Analysis of Rotary Ultrasonic Machining
Authors: Xu Chao Liang , Tang Xiao Hua , Xia Tian Yu
Published: October 2013

Rotary ultrasonic machining (RUM) is widely used for machining virous kinds of hard-brittle materials. This article aims to study ultrasonic machining surface quality of zirconia ceramic, low-carbonsteel boltwith self-developed rotary ultrasonic machine. The surface roughness could be detected and observed by Taylor Hobson surface roughness instrument and Keyence microscope.The experimental resultsshow that the surface quality achieved by rotary ultrasonic machining is better than bytraditional mechanical machining. Rotary ultrasonic machininghas advantages for machining hard-brittle materials.
Effect of Ultrasonic Wave on Latex Production and Quality of Rubber Tree
Authors: Zhu De Ming , Lin Wei Fu , Kong Ling Xue , Chen Min , Jing Wei , Qian Jan Ying , Deng Yao Jun , Li Zhuang , Lin Li Jing
Published: October 2013

The effects of ultrasonic wave on tapping surface of ‘PR107’ rubber tree were studied. Daily production and cumulative production of latex were measured to estimate the effects of ultrasonic wave on latex production. The solid substance content, dry rubber content and mechanical stability of latex were determined to study the effects of ultrasonic wave on latex quality. Results showed that ultrasonic wave could increase both daily and cumulative production of latex and maintain latex basic quality. The daily production of latex was increased and appeared two peaks both in the ultrasound-treated rubber tree and the one with no treatment. The first peak appeared on the fifth day, and the latex production by ultrasound was 212.34 ml and the control was 141.75 ml. The second peak appeared with the production 266.59 ml on the seventeenth day by ultrasound, while the control appeared on the thirteenth day with production of 193.50 ml. The latex cumulative production of ultrasound-treated trees was 209.56 ml higher than that of control in one month. There was little change in solid substance content and dry rubber content between different ultrasonic time. The best mechanical stability of latex was obtained by ultrasound-treating the rubber tree for 4-6 min. it was proved that the ultrasound was helpful in improving the latex production and quality. The application of ultrasonic wave on rubber tree is novel, and its mechanism is worth further research.
Mesh Creation Using Hypermesh for Casting Simulation
Authors: Moissiadis Anastassios , Paschaloudis Dimitrios
Published: October 2013

Casting is a manufacturing process by which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Casting materials are usually metals or various cold setting materials that cure after mixing two or more components together; examples are epoxy, concrete, plaster and clay. Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods.Due to the fact that several parts are designed with the involve of FEA we have more complex parts. Industries have to manufacture the complex parts and be in the limits of failure, for better analysis FEA are using also in the manufacturing process by simulate the casting of the complex parts.
Wear and Corrosion Resistances of Inconel718, HVOF Coating of WC-Metal Powder and Laser Heat-Treated Coating
Authors: Chun Hui Gon , Joo Yun Kon , Yoon Jae Hong , Cho Tong Yul , Fang Wei , Zhang Shi Hong
Published: October 2013

For the Improvement of wear and corrosion resistances of Inconel718 (In718) surface, high velocity oxygen fuel (HVOF) thermal spray coating of micron-sized WC-Cr-C-Ni powder was coated onto Inconel718 surface and laser heat-treatment of the coating was carried out. Porous coating of porosity 2.2±0.4% was prepared by HVOF coating, and it was improved by laser heat-treatment, reducing the porosity to 0.35±0.08%. Micro-hardness of laser heat-treated coating increased more than four times compared to the surface of In718. Friction coefficient decreased by HVOF coating and laser heat-treatment. Wear resistance improved, decreasing the wear depth by the coating and laser heating. The interface between coating and In718 was compacted, and elements diffused from both coating and inconel718 substrate to interface, forming metal rich buffer zone (interface) and enhancing the adhesion of coating. Corrosion resistance improved by coating in sea water 3.5% NaCl solution and in 1M HCl acid, but it worsened in 1M NaOH base. For the improvement of wear and corrosion resistances of Inconel718, HVOF WC-metal power coating and laser heat-treatment are recommended.
Synthetic Topographical Characterization Analysis of Oxygen Free Copper Surface Prepared by UVG on the Basis of Wavelet
Authors: Wu Song Lin , Zhao Jun , Li Shi Chao
Published: October 2013

To study the synthetic topographical characterization of oxygen free copper surface created by ultrasonic vibration grinding(UVG) and carry out a detailed research to indicate the removal mechanisms of ultrasonic vibration grinding and its technological process of surface creating, this paper researches the surface signals obtained by contact profiler and utilizes a new wavelet based method. Through wavelet decomposition and re-construction of surface signal, surface features, such as form error, waviness and roughness are separated rationally. Synthetic topographical characterization of oxygen free copper surface prepared by ultrasonic vibration grinding has been summarized in detail.
Preform and Die Designs for Hot Forging Process of Linear Slide Block
Authors: Yu Cheng Hsien , Sheu Jinn Jong
Published: October 2013

In this study, the preform and die designs of hot forging process were proposed for a long-flat slide block. This block is assembled to the linear slide for carrying the moving table. Three different billet geometry designs were proposed to obtain good die filling. The volume of the flash is limited to 30% with a flash thickness design in 3 mm. The forging die was designed with four ejectors to push up the forged part smoothly. The proposed billet geometries and die design were evaluated using CAE simulation. The simulation results indicated that the suitable perform design is able to achieve better material flow. The flash flow control is able to reduce the forming load and improve the die filling. The forging experiments were carried out to verify the proposed method, the experiment results showed good agreement with the CAE simulations. For the Improvement of wear and corrosion resistances of Inconel718 (In718) surface, high velocity oxygen fuel (HVOF) thermal spray coating of micron-sized WC-Cr-C-Ni powder was coated onto Inconel718 surface and laser heat-treatment of the coating was carried out. Porous coating of porosity 2.2±0.4% was prepared by HVOF coating, and it was improved by laser heat-treatment, reducing the porosity to 0.35±0.08%. Micro-hardness of laser heat-treated coating increased more than four times compared to the surface of In718. Friction coefficient decreased by HVOF coating and laser heat-treatment. Wear resistance improved, decreasing the wear depth by the coating and laser heating. The interface between coating and In718 was compacted, and elements diffused from both coating and inconel718 substrate to interface, forming metal rich buffer zone (interface) and enhancing the adhesion of coating. Corrosion resistance improved by coating in sea water 3.5% NaCl solution and in 1M HCl acid, but it worsened in 1M NaOH base. For the improvement of wear and corrosion resistances of Inconel718, HVOF WC-metal power coating and laser heat-treatment are recommended.
Study of Low Stress Repeated Impact Deformation of Gradient Coating
Authors: Ruan Jian Wu , Fu Ge Yan , Shi Shi Hong , Ding Chun
Published: October 2013

By using the method of laser cladding, the ability of gradient coating to resist the deformation under the condition of the accumulation of low stress multi-touch was studied, and compared to the single-coated which has the same thickness. The experiment results can be showed as follow: the metal material has a Characteristic of tends to the surface under the condition of low stress multi-touch. The deflection becomes bigger when it closer to the bearing surface of the coating, and it has little deflection when it very close to the matrix, but a macroscopical deformation showed in the matrix. Compared to the single coating, the gradient coating has a bigger ability of defending the deflection under the condition of the accumulation of low stress multi-touch.
Dynamic Model of Elastically Mounted Machinery with Cylindrical Shell
Authors: Xu Wei , Shuai Chang Geng , Lv Zhi Qiang
Published: October 2013

Mounting machinery by isolators can reduce vibration transmitted to the base and attenuated environmental noise. In this paper the machine having cylindrical shell such as electric motors is modeled by thin-wall cylindrical shell motion equation. The reaction force exerted by isolator is considered as point force and integrated in the shell equation. The typical vibration excitation of machinery is represented by point and line excitations. The forces transmitted to the base through isolators are then calculated under different excitations. Conclusions with respect to machinery and isolation system design are presented based on numerical results.
Subway Platform RF Electromagnetic Field Strength Test
Authors: Song Li Wei
Published: October 2013

Since in their tenders for subway fire alarm system contracts some fire detector manufacturers recently claimed that the RF electromagnetic field strength to which their products can resist is much higher than the requirements of the relevant national technical standards on fire, we have conducted tests on the RF electromagnetic field strength around the fire detectors installed on the platform of a number of selected subway stations in Guangzhou, and the performances of the electromagnetic radiation analyzer used for the tests are strictly in compliance with the specified use conditions for fire detectors installed on the platform in subway stations. The test results show that the RF electromagnetic field strength applied in the RF radiated immunity test as specified in relevant national standards conforms to the current application conditions.
Design and Development of Integrated Tester for the Hydraulic System on a Certain Type of Equipment
Authors: Guo Hua Ping , Li Ning , Tian Cheng , Zhao Shan Liang
Published: October 2013

The paper gives a detail account of how to develop an integrated tester for the hydraulic system on a certain type of equipment. The research shows the design and selection of the systems hardware and analyzing software, putting forward the application of key technologies as multi-channel sensor and automatic identification technology, multi-channel interference technology and data acquisition software based on virtual instrument. The evaluation and analysis of the practical applied results proves that the tester fulfills better the online monitor and fault diagnosis for the system, thus achieving the expected goal. The paper as well as shows the direction for improvement in enhancing the universality of the tester and completing the failure case base.
Validating the New Equivalent Static Design Method of Spacecraft Structures in Random Vibration by Test
Authors: Zhang Yu Mei , Han Zeng Yao , Shi Si Dian , Tan Li Meng
Published: October 2013

Random vibration is one of dynamic environments of spacecraft during launch. In engineering, design load was usually equivalent static load based on acceleration. A new equivalent static load based on strain or stress was presented by the writer. To validate the new equivalent static design method, random vibration test was designed including test article and test specification, and signal processing was in time domain; static test was designed to compare static yield strength and dynamic yield strength, and dynamic yield strength was 50% -80% higher than static yield strength; measured data in time domain was analyzed , and the equivalent static design of strain based on first passage model can be used to spacecraft structure design. And it will decrease the mass of spacecraft structure obviously.
Design and Experiment of Underwater Monitoring System for Fish Domestication Equipment
Authors: Zhang Lei , Hu Qing Song , Zhang Shi Long , Zhang Shou Yu , Bai Chun Xiang
Published: October 2013

The design of underwater monitoring system is an important component of fish domestication equipment for ocean ranching. In order to achieve the fish domestication effect so that to conduct feedback control of fish domestication device, this paper designs a wireless underwater camera monitoring system. The system includes local area network and GPRS network communication mode. The results of the underwater sealing experiment and the preliminary underwater camera test show the feasibility of the monitoring system. The effect monitored in Sparus macrocephalus domestication experiment in Xiangshan ocean area suggests that this camera system can not only meet the working requirements, but also be stable and reliable, which provides an effective means of monitoring for fish domestication on ocean ranching.
An Analysis of Dimension Roundness of Machine Elements Survey
Authors: Mi Gang
Published: October 2013

Machine element survey is a process by measuring, drawing, analysis, design according to existing elements, finally drawing the formal pattern of the element. The method that the operator used to deduce the original design dimensions based on measured value analysis is called dimension roundness. It includes the measured data processing, defining the basic dimensions, tolerances, limits and fits type.
Base on years of teaching, experiment, analyzing and practical producing experiences, I found that the dimension roundness and the presentation or definition of related elements in all textbooks were inexact and unreasonable. It influenced the effectiveness of higher vocational education.
This paper analyzed advantages and disadvantages of several dimension roundness methods, and then put forward the innovative practical roundness method. I revised the unconventional design dimension roundness; and pointed out that no matter using what roundness method, result diversity always exists.
Confirmation of Anisotropic Strains for FCC Poly Crystals and an Analysis of the Mechanism
Authors: Pang Dong Qing , Sun Yi Cai , Hutchinson Harry
Published: October 2013

The X-ray diffraction measurement was carried out in two different regions near the outer boundary of a loaded ring at the condition of a mono-axial stress, revealing the anisotropy of strains. This paper discusses the geometric relations between the crystalline face expansion and the bond elongation along the direction of the dense raw of atoms. Hooke's law for anisotropic strains and stresses with the anisotropic stiffness was established.
Prediction and Governance of Mine Gas Emission
Authors: Liu Yi Wen , Cao Yi , Zhang Lin , Meng Ming Chuan
Published: October 2013

Coal mining gas emission constrained by many factors, considering the eight main factors of gas emission. The first gas emission data are normalized, avoid data overflow to improve the training speed of neural network. Then use BP neural network to predict the amount of mine gas emission, finally proposed gas emission control measures.
Initialization Time Test and Analysis about the Control Unit of Fuel Cell Vehicle
Authors: Wu Chao , Liang Wei Ming , Lai Xu Nian , Liu Fen
Published: October 2013

The paper introduces the test process of the initialization time of the control unit of Fuel cell vehicle (FCV), including connecting to the high-voltage power supply speedily, connecting to the high-voltage power supply with normal steps, and correspondent vehicle testing and hardware in the loop (HIL) bench testing. By analyzing the hard-wired signal such as key location data from data collection device and by analyzing vehicle CAN signal, the test obtained the general initialization time of each control unit and their correspondent systems, and the time needed for speedy connection to high-voltage power supply, and sorted out the determining negative factor of speedy high-voltage connection. This test could obtain implicit system parameters, which might be referred to when improving vehicle properties.
Improvement of Large Size Smoke Duct Installation Plan
Authors: Cheng Tao , Wei Cheng Ge , Li Yong Qiang
Published: October 2013

Aim at the installation of power equipments large size smoke duct of the offshore platform, introducing a improving method which is more easy to operate.
Torsional Vibration Analysis of E-Type Membrane for Six-Axis Force Sensor
Authors: Xie Li Feng , Xu De Zhang
Published: October 2013

As six-axis force sensor (6-AFS) based on double layer E-type membrane takes a monolithic structure, it will inevitable generate coupling outputs when it is under the condition of dynamic loads. By means of the fundamental theory of mechanical vibration and elastic mechanics, this paper establishes an accurate mechanical model and successfully works out the dynamic outputs of torsional vibration of E-type membrane. It provides a theoretical basis for dynamic decoupling and structure optimization of 6-AFS.
Design of Digital Receiver Based on FPGA
Authors: Zhang Lin , Liu Yi Wen , Cao Yi
Published: October 2013

This article is intended to introduce electronic reconnaissance digital channelized receiver design ideas based on FPGA implementation structure. It takes the use of polyphase filter implementation of Achieved using the polyphase filter bank channelized receiver as the focus, and makes use of multiple parallel receiving channels to get the results of the simulation. The channelizing is realized in the FPGA device of xc4vsx55 which belongs to Virtex4 group in Xilinx family. During the process of design, highly effective polyphase and the parallel assembly line structure's FFT flexibility are fully considered, which reduce the operand enormously and raise the operating speed.
Design and Experimental Study of a 6-DOF Material Testing Machine
Authors: Wang Dan , Fan Rui , Guo Jiang Zhen , Chen Wu Yi , Sun Yong Sheng
Published: October 2013

A six degrees-of-freedom (DOF) parallel material testing machine (PMTM), which is based on Stewart Platform, is first proposed in this paper. Several essential issues including prototyping, compliant axis determination and controller design are investigated with specific methods or technologies. The compliant axis, along which the proposed machine has a better performance, is determined by the eigenscrew decomposition method. The proposed force controller incorporates the simplified inverse dynamic model output as a model-based portion of the controller and its validity is verified by means of simulations. Evaluation tests are performed to examine the practicability of the proposed controller and to determine the loading accuracy of the PMTM. Tensile tests and preliminary multiaxial loading tests are performed to verify the performance of the proposed PMTM. The experimental results illustrate that the proposed PMTM is capable of performing multiaxial loading tests of materials and thus a suitable candidate for multiaxial material testing machine.
Research on Image Acquisition and Data Transmission System of Burden Surface in Blast Furnace
Authors: Wang Li Qiang , Zhou Li
Published: October 2013

As images of the burden surface are directly related to working status of the blast furnace, monitoring system of the burden surface is essential for blast furnace. Images of burden surface are captured by CCD camera, and then transmitted by video line through anti-interference devices and video capture card from top monitoring device located in furnace roof to the main monitoring room. The three environment parameters including nitrogen pressure, water pressure and working temperature of CCD camera are very important to ensure CCD camera working in good conditions. Pressure gauges for nitrogen and water are installed near top monitoring device; temperature sensor for CCD camera is installed in the top monitoring device. All environment parameters are transmitted by RS485 transmission lines and modbus protocol to be dealt with in the main monitoring room.
Investigation of Computational Non-Linear Aeroelastic Response of High Aspect Ratio Wing
Authors: Rahman Hammad , Li Min
Published: October 2013

Aircrafts with high aspect ratio wings are most eligible candidates for high altitude and long endurance flights. Such wings show a non-linear deformation behavior because of structural geometric non-linearity. In the present study both linear and non-linear static aeroelastic behaviors of a high aspect ratio rectangular flat plate wing are analyzed using a simplified approach. The main emphasis lies in the tremendous change of lift distribution on the flexible high aspect ratio wing when large deflections are incorporated in the static aeroelastic analysis. The computational static aeroelastic simulations are performed in the finite element method based commercial software ANSYS-14. The aerodynamic load is calculated using the strip theory. Since the aero-load changes with the twisting deformation hence a user defined script is written using ANSYS parametric design language (APDL). The computationally achieved divergence velocity results are compared with the analytical results. The results of parametric study at different flight load conditions and angles of attack have highlighted the role of geometric nonlinearities in both bending and twisting deformations. The impact of follower pressure forces on the aeroelastic response is also investigated.
Experimental Study of the Shear Strength of Cobalt-Rich Crusts
Authors: Wu Hong Yun , Chen Zheng
Published: October 2013

The shear strength parameter of cobalt-rich crusts can be used to design cobalt-rich crusts mining head. The shearing test of cobalt-rich crusts sample was done with different angle shearing testing apparatus.Firstly, the cobalt-rich crusts sample with the size of 50mmx50mmx50mm cube was clamped in the variable angle plate.Secondly, the sample ware loaded till to be damaged. Lastly,the damaged load were recorded at the degree of 50, 60 and 70 to establish their shearing strength and normal stress empirical formula.According to the testing result, its cohesion and internal friction angle parameters are respectively 0.275MPa and 54.43 degree. Restricted by the number of samples and limited by laboratory testing,in-situ shearing strength test should be carried out to improve the proposed empirical formula.
Validity Range of Micropipette Radius in Using Hemispherical Cap Model
Authors: Jiao G.Y. , Dao Ming , Sow C.H. , Lim C.T.
Published: October 2013

Micropipette aspiration is a widely used experiment technique for studying mechanical properties of living cells. Its data can be processed in many different ways. Among them, a mathematical model called hemispherical cap model has been developed to evaluate the elastic modulus of the cell membrane undergoing micropipette aspiration. It has been commonly used in cell studies due to its simplicity and convenience. However, this mechanical model has its own assumptions and limitations. In this article, the authors used finite element simulation to obtain the validity range of micropipette radius used in hemispherical cap model. The results provide reliable size instructions in the preparation and post-processing of micropipette experiments.
Some Notes on the Grassmann Manifolds and Nonlinear System
Authors: Zeng Chun Na , Tao Peng
Published: October 2013

The differential geometry as a new tool has been introduced to research the control system, especially the nonlinear system. In this paper, by considering how to construct a manifold from a quotient space, we investigate the structure of Grassmann manifold concretely. This is beneficial to study the problem of finding periodic solutions of the matrix Riccati equations of control theory and the two point boundary problem.
Boiling Pattern and Thermal Ignition Experiment Study of the Aviation Fuel on Hot Surface
Authors: Qiu Hai Jian , Qiu Jin Shui , Liu Bo Yun , Yi Xiang Lie , Wang Kang Bo
Published: October 2013

This study was intended to solve the problem that fuel evaporation and ignition process on the high-temperature hot surface are difficult to be predicted accurately. The rule of fuel evaporation and ignition delay that various with hot wall temperature have been obtained by utilizing the simulated experiment to study the evaporation and ignition process of aviation kerosene on horizontal hot wall. This study not only complements the related content of the fuel ignition mechanism on hot wall but also provides reference method for the fuel fire engineering practice.