bluuebunny/crossref_metadata_2025 huggingface dataset:
Optical Module for Distinguishing Real and Fake Cracks in LCD and OLED Glass Boards
Authors: Cho Ju Yong , Woo Bong Ju , Jang Won Kweon
Published: September 2013

We developed an optical module for distinguishing true and fake cracks in LCD and OLED glass board conveyer. We used a pulse modulated infrared laser to improve the functionality of distinguishing true and fake cracks formed at the edges of glass board. The conventional optical detection algorism sensing real cracks modified to reduce any misinformation of fake crack for true crack. We discussed the optimum operational conditions as functions of pulse modulation frequency and wavelength of the laser, transport speed of glass board, spot size and working distance of a focused laser beam.
Comparison Vibration Amplitude for Magnetic Damping in Turning of Stainless Steel AISI 304
Authors: Amin A.K.M. Nurul , Mohamad Ummu Atiqah Khairiyah Bt. , Arif Muammer D. , Muthalif Asan Gani Bin Abdul
Published: September 2013

This paper presents the improvement in chatter vibration damping using different types and arrangements of magnets, as well as comparison with normal cutting conditions in turning of stainless steel AISI 304. Chatter is defined as the self-excited violent relative motion between the cutting tool and work-piece. It is the common vibration problem that limits the productivity of machining processes, since it leads to shortened tool life, poor surface finish, breakage and premature damage of cutting tool, as well as mechanical deterioration. The occurrence of chatter during metal cutting process also causes instability of the machine tool system. Though there has been a large number of works on identifying the causes of chatter and its behavior, there is still no consensus among researchers on this very vital issue of machining. Previously, the incidence of chatter was thought to be due to forced vibration, BUE formation, cutting speed, and cracking during chip formation. Different ways to overcome this problem have been investigated, such as using piezoelectric inertia actuators, feed-forward neural network controllers, and work-piece preheating methods. In this research, permanent magnets with different size, strength, and composition are mounted around the cutting tool. A vibration sensor (accelerometer) is placed at the bottom of the tool to record the suppression of chatter amplitude in turning operation. It is shown that magnetic force can modify the frequency response function of the cutting tool resulting in improved cutting stability in turning operations. Chatter can then be effectively suppressed due to increased cutting stability.
Cable Reinforced Small Scale Horizontal Axial Wind Turbine
Authors: Ma Yuan , Zeng Pan , Lu Hong Ya , Xu Yue Jie
Published: September 2013

In this paper, a cable reinforcement structure for small scale horizontal axial wind turbines is proposed. Shock-vibration tests were performed on the cable reinforced structure with different parameters of cable installation. The first order frequency of the blade was chosen to represent the stiffness of the blade rotor. According to the results, an optimum location of cable reinforcement exists at around 1/3 length of the wind turbine blade, and the first order frequency of the blade rotor will rise with the tension of the cable in a certain range. Further analysis showed that besides improving the reliability of the wind turbine rotors, the cable reinforcement structure also provides a possibility to use cheaper materials for blade manufacturing and also control the noise level of small scale horizontal axial wind turbines.
Plasma Impedance Tuning Effect on Nanostructure of Diamond Films
Authors: Thowladda W. , Khlayboonme S.T.
Published: September 2013

The morphology and structure of nanocrystalline diamond films as well as the plasma chemistry were studied by altering the plasma impedance. These impedances related to electron density were altered via the matching system. Two films were grown by the microwave plasma under different values of the plasma impedance, resulting in low and high electron densities in the plasma. By the use of measurements of plasma impedance and optical emission, the lowering of an inductive component of the impedance, indicating an increasing electron density, encouraged H-radical concentration present in the plasma. As the plasma was changed to the high electron density, Raman spectra of the films showed the sp3Raman peak shifted from 1325 to 1328.5 cm-1with narrower broadening. This behavior arose from an increase in grain size, corresponding to images from a field emission scanning electron microscope. Raman spectra of G-peak position and white light reflectometry showed a reduction in sp2carbon content of the film. The G-peak shifted from 1564 to 1541 cm-1and refractive index increased from 1.84 to 2.16. The formation of the films related to the concentrations of H and CH3radicals. The plasma impedance affected the radical concentrations.
Study on Simulation Analysis of Reinforced Concrete U-Shaped Aqueduct
Authors: Ji Dongy Yu
Published: September 2013

This paper adopts general finite element software to carry out three-dimensional finite element simulation analysis for Kuankoujinggou reinforced concrete U-shaped aqueduct. Considering five combination cases in aqueducts construction and operational process, researching variation laws of the aqueducts stress and displacement. Analysis results show that design scheme of Kuankoujinggou reinforced concrete U-shaped aqueduct is reasonable, it can meet design requirements. Analysis results provide some theory references for design of reinforced concrete U-shaped aqueduct.
Research on Finite Element Analysis of Nanping Inverted Siphon Engineering
Authors: Ji Dongy Yu
Published: September 2013

This paper adopts universal finite element calculation software to carry out force analysis for Nanping trench-buried inverted siphon,computer is applied in analysis of trench-buried inverted siphon. Deducing variation law of the inverted siphons stress and displacement in construction process and operational process. The calculation results further shown design schemes rationality and safety. which provide reliable reference of design and construction for the trench-buried inverted siphon.
Force Analysis of Reinforced Concrete U-Shaped Beam-Supported Aqueduct
Authors: Liu Ke Ding
Published: September 2013

This paper adopts general finite element software to carry out three-dimensional finite element simulation analysis for Sunjiagou reinforced concrete U-shaped beam-supported aqueduct. Considering five combination cases in aqueducts construction and operational process, researching variation laws of the aqueducts stress and displacement. Analysis results show that design scheme of Sunjiagou reinforced concrete U-shaped beam-supported aqueduct is reasonable, it can meet design requirements. Analysis results provide some theory references for design of reinforced concrete U-shaped beam-supported aqueduct.
Structural Analysis for Bitumen Residuum Concrete Inclined Wall Rockfill Dam of Fengguo Reservoir
Authors: Ji Dongy Yu
Published: September 2013

Through analyzing bitumen residuum concrete inclined wall rockfill dam structures mechanical characteristics in construction process and operational process, this paper adopts finite element method to carry out structural analysis for bitumen residuum concrete inclined wall rockfill dam of Fengguo reservoir. Deducing distribution law of the dams stress and displacement in construction process and operational process. Analysis results show that, bitumen residuum concrete inclined wall rockfill dam construction of Fengguo reservoir is reasonable, it meets the requirements for design.
Self-Tuning Fuzzy Adaptive PID Pitch Control of Wind Power Systems
Authors: Zhang Feng , Lu Ye Hui , Qiao Feng , Bai Chong Chong
Published: September 2013

A large variable speed constant frequency (VSCF) wind power system usually adopts the variable pitch control technology to ensure the output power is steady to ensure the safety of the wind power system above the rated wind speed. But the strong nonlinear and large moment of inertia of wind turbine result in the difficulty of variable pitch control, both simple fuzzy control and conventional PID control can not achieve a good control effect. Concerning this issue, variable pitch control algorithm is proposed based on self-tuning fuzzy adaptive PID control strategy. According to the dynamic model of VSCF, a simulation model of wind turbine control system is built in this paper with Matlab/Simulink. When the wind speed is random variable above the rated speed, the simulation results show that the proposed control strategy can keep the output power of the system around the rated power.
Study on the Thermal Sensitivity of Energetic Materials Characterized by Accelerating Rate Calorimeter (ARC)
Authors: Zhang Hong , Zan Lu Jun , Zhao Bo , Qiu Hui Dong
Published: September 2013

Liquid energetic materials were not tested through traditional test methods for thermal sensitivity. Accelerating Rate Calorimeter (ARC) was scientific to test thermal sensitivity of energetic materials. The decompositions of Hexogen (RDX), Octogen (HMX), 2,4,6-Trinitrotoluene (TNT), Nitromethane (NM), Iso-propyl Nitrate (IPN) were studied by ARC. Kinetic and thermodynamics parameters were calculated and analyzed. Temperature corresponding different time to maximum rate under adiabatic condition (θ) was calculated. The results show that the thermal sensitivity of energetic materials is NM>IPN>RDX>HMX>TNT, which suggests ARC could be used in the test of thermal sensitivity of liquid energetic materials.
Stability of an Underactuated Passive Biped Robot Using Partial Feedback Linearization Technique
Authors: Kochuvila Sreeja , Tripathi Shikha , Sudarshan T.S.B.
Published: September 2013

This paper discusses the problem of achieving stable walking of a compass gait biped robot on a slope. A reference trajectory for stable walking is generated using Lagrangian dynamics of the biped robot. It is shown that an underactuated robot can follow the reference trajectory using a control law based on feedback linearization with respect to both hip and ankle joints. The results are compared in terms of Mean Square Error (MSE). The validity of the proposed controller is carried out using simulation studies.
Compound Control of Attitude Synchronization for Autonomous Docking to a Tumbling Satellite
Authors: An Xue Yan , Lu Wei , Ren Zhang
Published: September 2013

In order to solve the attitude synchronization control problem for an on-orbit servicing spacecraft autonomous docking to a tumbling satellite in the presence of unknown bounded disturbances and system uncertainties, a compound control law is presented in this paper. The compound control law is composed of a nonlinear feedback control law and a compensate control law. The nonlinear feedback control law is mainly used to track the system command and the compensate control law is mainly used to deal with the external disturbances and system uncertainties to enhance the robustness of the control system. Simulation results verified the effectiveness of the designed compound control law, and the robustness to the unknown bounded disturbances, system uncertainties is also demonstrated.
Thermal Energy Harvesting Aware Routing for Wireless Body Area Network in Medical Healthcare System
Authors: Chen Yee Ming , Peng Yi Jen
Published: September 2013

Extracting an electrical energy from various environmental sources, called energy harvesting (or energyscavenging), has been an issue and attracting researchers attention in energy replenish networks.Thermal energy harvesting holds a promising future for generatinga small amount of electrical power to drive partial circuits in wirelessly communicatingelectronics devices. Reducing power consumption has also become a major challenge in wireless body area network (WBAN). The reliability ofthe WBAN is greatly dependent on the life span of theenergyaware routing in networks.In this paper presented a fuzzy controller for thermal energyaware routing in WBAN.The paper concludes with performance analysis of the thermal energy harvesting aware routing, comparison of fuzzy and other traditional energy management techniques,while also looking at open research areas of thermoelectric harvesting and management for wireless body area networks.
CAD of Multi-Pulleys Automotive Timing Belt on Visual C++
Authors: Cai Yun Guang , Shi Yao Chen , Zhang Yun He
Published: September 2013

Aimed at multi-pulleys timing belt transmission system of automobile engine , programing parametric design software based on visual C++, set up timing belt and pulleys 3D model , Improve the design efficiency by design chart and data programmed processing .through comparison of conventional design result , verify the software feasibility and exactness.
Efficient Wall Distance Calculating with Box-Splitting Method
Authors: Li Guang Ning , Xu Min
Published: September 2013

The wall distance is still a key parameter in many applications of turbulence model. The efficiency of wall distance calculating is very important for some complex geometries flows. For stationary problems the wall distance is computed only once, but for the problems with moving body it need to be computed repeatedly and the cost is expensive. Based on the searching procedures, the crude searching method in which the nearest wall distance for a given point within the volume is calculated by measuring the distance to every surface point and keeping the minimum, and the alternating digital tree (ADT) method which is based on the technique of an especial binary tree, are studied and compared. Then a new efficient wall distance calculating method named BSM (box-splitting method) is proposed. Internal and external test cases are use to verify the efficiency of BSM method. The results show that the BSM method is both robust and efficient for internal/external problems, and it can be easily implemented into current CFD software to improve the efficiency of wall distance calculating for turbulence modeling.
Consumers' Tactile Images of Foam Sofa Cushions
Authors: Chen Tien Li , Chou Ya Kuan
Published: September 2013

This study examined consumers tactile images of foam sofa cushions. Firstly, the authors sought to understand the manufacturing process for sofa cushions by interviewing some sofa manufacturers and five popular types of foam sofa cushions were produced. The hardness, density and elasticity of the samples were then assessed by analyzing their physical properties. Thirdly, consumers tactile images were analyzed using a Semantic Differential Method and the results for physical properties and psychological experience were compared using Statistical Methods in order to assess consumers tactile images. The results were as follows:The tactile images of different layers of foam structures were identified as stable for Single-Layered Foam, comfortable and stable for Double-Layered Foam, and comfortable, flexible and stable for Multi-Layered Foam.Experiments to determine tactile images demonstrated that foam sofa cushions that had a smaller mean hardness, density, and elasticity seemed more comfortable and flexible and vice versa.Consumers might sit on a sofa when choosing foam sofa cushions in order to assess their actual properties and stability. More flexible foam cushions provided less support and resulted in consumers feeling uncomfortable and tired.
Automation of an Atomized Meter Dose Inhaler for Lung Disease Patients
Authors: Wang Song Hao , Menéndez Cifuentes Angel Bernal
Published: September 2013

A reliable universal triggering system for atomized meter doseinhalers was built. Although the exact dosage into the airway system at different triggering delays was not possible to be determined by means of directly measuring its weight, the use of lasers reflection and high speed movie is an effective comparison method to determine the appropriate triggering moment. A set of transparent tubes was built to imitate the dimensions of a human trachea and bronchiole and two lasers were placed coaxially with such tubes. Light from the lasers was only reflected when the atomized medicine was passing through the tubes;so the longer the time the laser light could be seen, the more effective amount of dosage was being delivered to the lungs.
From the experiment, it seems that the best delay time for triggering an inhaler is in the range between 0.7-1.s under the flow rate specified. Any time before that will result in medicine loss, and any time after that the patient might not be able to keep inhaling.
Research on Relationship of Pressure Distribution and Particles Separation in Cyclone
Authors: Zhang Ying , Ma Xiao Qian , Zhang Zhen Wei , Kang Cheng Ming
Published: September 2013

This paper mainly deals with pressure situation in cyclone aiming to obtain the pressure distribution and pressure drop in cyclone separation by taking advantage of the model of RSM of software Fluent, and put forward that the total pressure of import part is the highest and the minimum total pressure locates inside exhaust pipe in cyclone. Static pressure of outside swirl is relatively higher than the inner swirl, and the minimum static pressure occurs in the axis of the separator extending into the dust hopper. Relationship of pressure distribution and particles separation can be obtained according to the analysis, which can provide the theoretical basis for further enhancement of performance and structure optimization.
Analytical Solution of the Vibration of Delaminated Bimaterial Beams Fully or Partially Supported by Elastic Foundation
Authors: Liu Yang , Shu Dong Wei
Published: September 2013

Delaminations in structures may significantly reduce the stiffness and strength of the structure and may affect their vibration characteristics. In the present study, an analytical solution is developed to study the vibration of delaminated bimaterial beams fully or partially supported by elastic foundation. The free mode and constrained mode assumptions in delamination vibration are adopted. This is the first study on the vibration of delaminated bimaterial beam on elastic foundation. Results show that the effect of delamination on reducing natural frequency is aggravated by an increasing stiffness of elastic foundation. An empirical estimation of such effects is provided for engineers. The effects of elastic foundation on the variation of natural frequency against axial stiffness ratio and bending stiffness ratio of beams are thoroughly investigated. The analytical results of this study can serve as the benchmark for FEM and other numerical solutions.
Study on the Periodic Solutions to a Superquadratic Discrete Hamiltonian System Based on Mechanics
Authors: Sun Da Wei , Liu Jia Rui
Published: September 2013

This paper studies the periodic solutions to a superquadratic second-oder discrete type Hamiltonian system in the n dimensional Euclide space. By the variational methods and some discrete computional techniques, this paper proves the existence of solution to a new type discrete Hamiltonian system.
Experimental Study on Cutting Force and Surface Roughness for 7050-T7451 Aluminum Alloy of High Speed Milling
Authors: Zhong Zhao Lin , Ai Xing , Liu Zhan Qiang
Published: September 2013

This paper presents the experimental results of cutting force and surface roughness of 7050-T7451 aluminum alloy under the cutting speed of 3000~5000m/min. The cutting forces and surface roughness with different cutting parameters were analyzed. Experimental results suggested that increasing cutting speed would engender thermal softening, which would in return affect the cutting force and surface roughness in high speed milling. The cutting force and surface roughness were affected by cutting depth and feed rate obviously. Surface roughness was also affected by cutting width which changed the cutting force slightly. According to the results, proper parameters could be selected and thermodynamic relationship needed to be discussed for further research.
Ride Comfort Optimisation of Passenger Car Passive Suspension Systems Using ADAMS/ Insight
Authors: Tang Ai Hua
Published: September 2013

The arising health problems of ride comfort of passenger cars point out that a lot of effort still has to be put into the design of passive suspension systems.The comfort problem originates from the vibrations transmitted to the driver and passengers caused by the unevenness of the road. This paper reports on an investigation to determine the spring and damper settings that will ensure optimal ride comfort of a passenger car at different speeds. D-optimal designs are developed via multibody dynamics software (ADAMS/Insight) with a model. Evaluation of the comfort improvement was done using an objective function according to the international organisation for standardisation (ISO)2631(1997). The optimised passive suspensions equipped in a passenger car were tested on a test rig in ADAMS/Car. The results show that the vibration levels can be reduced by 47%, generating a drastic comfort improvement.
Prefabricated Hole Mathematical Model of Flange-Forming of Tee Pipe with Square Branch
Authors: Wang Zhong Lei , Li Zhao Dong , Cheng Gang , Zhang Xin Kai
Published: September 2013

Based on the principle that in the deformation zone the length of bore plain wire does not change, a mathematical model of the prefabricated hole for flange-forming of square hole tee pipe is established, for the difficult problem of the flange-forming prefabricated hole size design for square hole tee pipe. To solve the mathematical model, a numerical method and a software system for the mathematical model is established. In order to verify the reliability of the mathematical model and its solution, the method of finite element simulation is applied to verify the mathematical model and the solving system. The results show that the mathematical model constructed in this paper can relatively accurately make calculation of prefabricated hole size for flange-forming of square hole tee pipe.
The Source of Ore-Forming Material in Barite-Fluorite Deposits, Southeast Sichuan in China: Sr Isotope Evidence
Authors: Zou Hao , Fang Yi , Xu Zhan Zhang
Published: September 2013

Barite-fluorite metallogenic belt of southeast Sichuan is one of the important metallogenic belt in China. The initial ratio of 87Sr/86Sr is the good tracer in study of diagenetic mineralization process and sources of ore-forming materials. The 87Sr/86Sr ratio of fluorite and barite from barite-fluorite deposits in southeast Sichuan is 0.708800~0.712999, and it similar to The 87Sr/86Sr ratio of Cambrian carbonate rocks and ordovician limestone, but expect the lower Cambrian Niutitang group stratum, the Ba content of other layers are generally low, Therefore, the Ca source of ore-forming materials should be multisource, mainly from Cambrian-Ordovician carbonate strata , and the main Ba source of layer should be the lower Cambrian Niutitang group stratum.
Simulation of the Effect of Sintering Pressure on Microstructure Evolution in Nanocomposite Ceramic Tool Materials
Authors: Cheng Hong Mei , Huang Chuan Zhen
Published: September 2013

A Monte Carlo Potts model coupled with sintering pressure for the sintering process of nanocomposite ceramic tool materials is proposed, the relation between grain growth and sintering pressure is presented. The grain growth process at different sintering pressure is investigated in this model, and the effect of sintering pressure on microstructure evolution is discussed, it is found that the mean grain size increases with the increase of sintering pressure during simulation. The results from this simulation are shown to correlate well with the experimental observations.
The Application of Magnesium Alloy in Automotive Seat Design
Authors: Wang Shu Fen , Hu Wen Wen , Gao Zhen Hai , Zhao Tian Peng
Published: September 2013

Vehicle weight reduction has become the development trend of the automotive industry, lightweight magnesium alloy as the material can be applied to automobile parts to achieve more substantial weight loss results. This paper adopts a car seat frame, refer to the regulations for strength of seat system, finite element software ANSYS, the static strength analysis of magnesium alloy seat frame. And further on carbon steel material for static strength analysis, conclusions and magnesium alloys were compared, from lightweight, economy and other aspects show the superiority of magnesium alloys.
Effect of Intercritical Quenching on Microstructure and Mechanical Properties of Oil Casing Steel N80
Authors: Huang Min , Wang Yu , Zhang Ya Ni , Xie Yue Wei , Li Shuo Feng
Published: September 2013

In order to improve the toughness of oil casing steel N80 without the sacrifice of its original high strength, an intercritical quenching treatment was conducted under the temperature determined by a differential scanning calorimetry (DSC) analysis. Effects of intercritical quenching on the microstructure of oil casing steel N80 were characterized by means of optical microscope (OM) and scanning electron microscope (SEM). Tensile strength, reduction of cross-sectional area and microhardness were measured to evaluate the mechanical property of oil casing steel N80 after intercritical quenching treatment. The study results show that the tensile strength and microhardness of intercritical quenched oil casing steel N80 consisting of ferrite (F) and martensite (M) is slightly lower than that of tempered oil casing steel N80 composing of sorbite (S), yet which is still higher than that of full annealled oil casing steel N80 composing of pearlite (P) and a little amount of ferrite (F). In particular, the reduction of cross-sectional area of oil casing steel N80 intercritical quenched at 740°C is higher than those of tempered and full annealled. Additionally, both dimple and cleavage can be found on the impact fracture surface of N80 steel after intercritical quenching at 740°C. The toughness of oil casing steel N80 can be obviously improved by the intercritical quenching treatment at 740°C due to the formation of ferrite (F).
Fabrication and Dielectric Characterization of a Novel Polyimide
Authors: Lin Jia Qi , Zhang Pan Pan , Yang Wen Long
Published: September 2013

A novel polyimide (PI) films with three kinds of monomers was synthesized in this paper. The polyimide unit is derived from Pyromellitic dianhydride (PMDA), 3,3',4,4'-benzophenonetetracarboxylic dianhydride, (BTDA), and 4,4, -diaminodiphenyl ether (ODA). The dielectric properties of the films were measured. The dielectric spectra show that dielectric constant is about 3.7, which is larger than the PI with two kinds of monomers. In addition, the loss tangent and conductivity of the films is quite small, which is important for the practical use of them.
Raman Spectral of Ce/Mn Co-Doped LiNbO3 Crystal
Authors: Wang Miao , Wang Yun Long , Wang Rui
Published: September 2013

Ce:Mn:LiNbO3single crystals with different [L/[N were used for the measurement of Raman spectrum. Each peak appeared in the Raman spectrum was ascribed to the basic vibration modes of the LiNbO3crystal according to the basic analysis and the achievements obtained by the earlier researches. The results showed that the peak width at half height (FWHM) of the A1(TO1) vibration mode become wide gradually with the increase of the [L/[N. However, the FWHM of A1(TO2) and A1(TO4) vibration mode decrease with the increase of the [L/[N in the crystal. The FWHM of the E(TO1) vibration mode was decrease with the increase of [L/[N in the crystal, and also the linear relationship between the FWHM of the E(TO1) vibration mode and the [L/[N in the crystal. According to the relationship between the [L/[N in the crystal and the FWHM of the E(TO1) vibration mode for the pure LiNbO3crystal, the quantitative relation for the Ce/Mn co-doped LiNbO3crystal was revealed by amending the empirical formula for pure LiNbO3crystal on the basis of the results measured by ICP-AES. The quantitative relation of the FWHM of the E(TO1) vibration mode and the [L/[N was given by the Polynomial Fit of the experimental data.
Application Study of FRTP Materials in the Civil Engineering Products
Authors: Wei Shao Ming
Published: September 2013

The FRP materials can be divided into FRTP( fiber reinforced thermoplastic plastic) and FRSP( fiber reinforced thermoset plastic) according to the resin materials. As a new kind of composite, FRTP attracts people. s attention for the characteristics of light weight, durability, no environmental pollution and reshaping. According to the characteristics of FRTP, we compare the impregnation and moldinging process of FRTP materials and the physical properties of FRTP and FRSP. We study the FRTP laminates products for civil engineering and its mechanical properties and the application situation at home and abroad. Some problem to be solved are also presented.
Correct Direct Discrete-Continual Boundary Element Method of Structural Analysis
Authors: Akimov Pavel A.
Published: September 2013

This paper is devoted to so-called direct discrete-continual boundary element method of structural analysis. Operational formulation of the problem is given. Using fundamental operational relations of direct approach after construction of corresponding fundamental matrix-function in a special form convenient for problems of structural mechanics and its application resolving set of differential equations with operational coefficients is obtained. The discrete-continual design model for structures with constant physical and geometrical parameters in one direction is offered on the basis of discrete-continual boundary elements. Basic pseudodifferential operators are approximated discretely by Fourier series. Fourier transformations and Wavelet analysis can be applied as well.
Surface Modification of Activated Carbon and its Effects on Methane Adsorption
Authors: Hao Shi Xiong , Yu Zu Xiao , Liu Xing Yong
Published: September 2013

In this work, one activated carbon (AC) was modified with H2O2, (NH4)2S2O8 saturated solution and H2SO4/(NH4)2S2O8 mixture respectively. The oxygen groups on ACs surface were characterized by Boehm titration. The textures of the ACs were investigated by N2 adsorption at 77 K. The influence of surface oxygen groups on methane adsorption on ACs has been studied. The results of Boehm titration showed that the concentration of acidic oxygen functional groups on the AC surface increased after modification. N2 adsorption data showed that the specific surface area SBET and the micropore volume Vmic of AC were changed lightly after modification. It was observed that there was, in general, a positive correlation between the methane saturated adsorption capacity and the SBET of ACs while a negative correlation between methane saturated adsorption capacity and the total surface acidic groups. The methane saturated adsorption capacity was determined by the ACs surface chemistry when the microporosity parameters of two samples were similar. AC with a higher amount of oxygen surface groups, and consequently with a less hydrophobic character, had lower methane adsorption capacity.
Mechanical States of Repaired Full-Thickness Defects of Articular Cartilage by Tissue Engineering under Compression
Authors: Bao Yan , Liu Hai Ying , Liu Qing , Gao Li Lan , Zhang Chun Qiu
Published: September 2013

It is difficult to repair the damage cartilage by itself when cartilage is injured. Cartilage tissue engineering is an ideal treatment method to repair cartilage defects, but at present, the repair has some uncertain effects which is caused by the mechanical states of the repaired region. Under the compression, mechanical behaviors of the repaired full-thickness defect were analyzed by means of the digital correlation technology. Experiments show that in the direction of vertical cartilage surface, the maximum compressive strain of artificial cartilage is 1.7 times higher than the normal host cartilage at 5.1% compression, and it is 1.4 times higher than the normal host cartilage at 25.6% compression. In parallel to the cartilage surface direction, the interface appears compressive strain and the host cartilage near the interface presents a smaller tensile strain. In the aspect of shear strain, direction of shear strain at the junction changes to the opposite direction with the compressive increase.
Effect of Vanadium and Niobium on Abrasive Behaviour of Arc Sprayed 4Cr13 Coatings
Authors: Deng Yu , Yu Sheng Fu , Yan Ning , Xing Shu Le , Huang Lin Bing
Published: September 2013

4Cr13 martensitic stainless steel coatings with different amount of V/Nb were prepared on the surface of the Q235 low-carbon steel by high velocity arc spraying (HVAS). The microstructure and properties of the coatings were characterized and tested by scanning electron microscope (SEM), X-ray diffraction (XRD), optical microscope, microhardness tester and wear tester. And the wear mechanisms of the coatings have been studied. The results showed that optimal percentage of V/Nb could improve performance of the coatings. The coatings had good forming properties, uniformity of microstructure and compact structure.The highest value of adhesion strength was up to about 36.80 Mpa. The hard particles could incease the hardness and wear resistanc of the coatings.The average microhardness was about 523 HV0.1, higher than that of 4Cr13 coatings, and the abrasive wear resiatance was enhanced because of the added elements V and Nb. Key words: alloying coatings; 4Cr13; V/Nb; high velocity arc spraying (HVAS); abrasive behaviour
Oxidation Protective Barrier Coatings for Austenitic Stainless Steels at 1100°C
Authors: Zhang Zhong Li , Wei Pen Yao , Zhang Nan Nan , Wang Qi Shen , Gong Xue
Published: September 2013

An arc-sprayed oxidation protective barrier coating system on austenitic stainless steel is composed of an inner Ni-Cr-Ti alloy layer and a pure aluminum outer layer. The high-temperature oxidation behavior of the coatings on 304N substrate was investigated during isothermal exposures in air at 1100°C. Experiments showed that interdiffusion of alloying elements within the protective coatings occurred, and the elements, Cr,Ni and Al, were also diffusing into the substrate metal. As test time proceeded, aluminum nitrides were generated in situ in the substrate, which had a layer-like distribution. The nitrides generated play the roles as element diffusion barriers, and together with the surface alumina they provide a long-term effective anti-oxidant protection to the steel substrate. The coatings on 304N substrate were not deteriorated and the substrate was protected well, being exposed to 1100°C for 350 hours. The analysis results of oxidation kinetics showed that the specific mass changes of the coated specimens were much smaller than those without coatings.
Precise Stability Analysis of Stepped Telescopic Booms and Practical Algorithm
Authors: Du Liang , Lan Peng , Lu Nian Li
Published: September 2013

To analyze the stability of stepped telescopic booms accurately, using vertical and horizontal bending theory, this paper established the deflection differential equations of stepped column model of arbitrary sectioned telescopic boom, the stability were analyzed, and obtained the precise expression of the buckling characteristic equation; Took certain seven-sectioned telescopic booms as example, by comparing the results with ANSYS, the accuracy of the equations deduced in this paper was verified. Presented the equivalent component method for the stability analysis of multi-stepped column, the equivalent cross-sectional moment of inertia was deduced by energy method, thus the stability of stepped column equivalent to that of constant section component. By comparing the results with exact value, the precision of equivalent component method was verified which was convenient for stability analysis of telescopic boom.
ADACD-Based Novel Optimal Model Identification Scheme for MIMO Discrete Nonlinear Systems
Authors: Liang Mian Xin
Published: September 2013

A model identification scheme based on the action dependent adaptive critic design (ADACD) is proposed for MIMO discrete nonlinear system. This scheme first introduces a critic network to approximate the overall identification evaluation of the system and then adjust the parameters of the identification network (i.e. action network) to minimize the output of the critic network. The system is proved to be uniformly ultimately bounded by using Lyapunov method. Furthermore, the weights of the critic and identification networks are also guaranteed to be bounded.
The Study of Induction Setter Based on Low Density Parity Check Coding Method
Authors: Liu Fu Xiang , Wang Liu Min , Zhang Feng , Xu Xiao Mei
Published: September 2013

In order to improve anti-jamming capability and transmission efficiency of the inductive setter, a structured approach to construct several low density parity check(LDPC) codes is used in this paper. The LDPC codes have different error-correcting capability, and can timely correct BER which are generated during the transmission of channel. The simulation analysis show that the LDPC codes can effectively avoid retransmission of the codeword, and raise the Induction Setter anti-jamming capability and transmission efficiency. The method of LDPC codes used in the inductive setting can ensure the control information efficiently load to the fuse.
Correction of the Asymmetrical Projection for Accurate Camera Calibration Using Co-Planar Circular Feature
Authors: Meng Xiang Lin , He Wan Tao , Che Xiang Qian , Zhao Can
Published: September 2013

Circular features are one of the most widely used shapes for camera calibration, due to several advantages: easy to make and recognize, not sensitive to image noise, symmetry, analytic formulation is simple. However, perspective projection is generally not a shape preserving transformation. A circle often mapped as an ellipse on the image plane when the feature and the image plane are not parallel to each other, as a result, the center of the circle shift from the center of the ellipse. In this paper we present a simple and robust algorithm to compensate this bias before camera calibration. Experimental results show the algorithm is important and convenient.
Hardware Design of the Agricultural Greenhouse Internet of Things Monitor Terminal
Authors: Wu Lei , Jiang Xun Yan , Xie Yu
Published: September 2013

The monitor terminal (Single Chip Microcomputer 89c51) can be used as the portable device, also can be fixed at the farm to form the monitor terminal internet. It can be connected with the control center (the upper computer) by wired and wireless transmission. It can be functioned as the monitor by PCB design, the perceptual layer module design and the electric equipment controller design.
The Optimization of Piston Groove Diameter Based on ABAQUS
Authors: Qu Sheng Guan , Li Wen Long , Li Bin
Published: September 2013

Two factors must be given considered in low friction cylinder , which are sealing and wear. A lower contact pressure can lead to seal failure. However, a heavier contact press can increase friction force and wear. In the present paper a method have been proposed to obtain the optimal contact pressure between PTFE wear-resistant ring and the steel bushing at first, with analysis of the relationship among the surface roughness, the sealing contact pressure and the leakage. Secondly,the piston groove Diameter has been designed by using the finite element analysis software of ABAQUS to simulate the Mooney-Rivlin model, which is corresponding to this optimal contact pressure. On the premise of meeting the requirement of the specific leakage standard between the cylinder and the wear-resistant ring, the optimal contact pressure and the corresponding piston groove size have been obtained, with different surface roughnesses of the friction pairs.
Research on Object-Oriented System Model Based on Feature
Authors: Li Ke Wang , Li Qiang , Niu Xing Hua
Published: September 2013

The paper introduces that the mechanical machining system can be divided into various objects such as parts, machining processes and manufacture resources and classified by using the objected-oriented technology in the CAD/CAPP/CAM integrated systems produced from some kind parts. Using the method of shape and surface description, the parts features can also be classified in various levels. The paper also introduces the principle and method of establishing system model on the basis of summarizing and inducing interrelation among features. We have applied the method to practice and achieved better results.
Analysis on Knowledge Sharing Risks in Knowledge Chain Based on Matter-Element
Authors: Yang Cui Lan
Published: September 2013

In knowledge economy and web economy times, cooperations for knowledge among firms are becoming more and more important. But, since some characteristics of cooperating organization and knowledge itself, there exist many risks during the choice of its partners. Firstly, the article analyses 7 risks during the choice of partners; Secondly, expounds thesteps that chooses partners based on Method of MatterElement Analysis; At last, creates an example to explain the use of the method. At the same time, bring the Multi Response Variable Analysis and Borda Method to perfect the use of Matter-element analysis during the choice of partners for knowledge chain.
Risk Analysis on Grain Quality in the Drying Process
Authors: Wu Xin Yin , Fu Yao , Xu Yan
Published: September 2013

Drying is one of the important chain of operations in agricultural industry, having important implications for maintaining edible quality and reducing the production loss of grain. International and domestic scholars have done a great deal of research about heat and mass transfer, change of grain quality, process monitoring and equipment during the process of grain drying, but none about the risk analysis of grain quality during the process of drying have been published yet. Therefore, based on the model of change of grain quality that is previously built, the paper intends put forward some suggestions on the production and application of grain drying equipment, adopting the AFSOM method in the procedure of risk analysis of grain drying quality.
Highly Anti-Noise and Adaptive B-Spline Curve Reconstruction Based on ICT Slice Images
Authors: Liu Guang Shuai , Li Bai Lin
Published: September 2013

Obtaining effective value points is one of key issues in cubic B-spline curve reconstruction. Since it is unfavorable for the selection of value points through curvature methods and the point cloud data acquired from ICT slice images is characterized with large volume of data, high noise and density, a baseline adaptive method is presented to get value points for curve reconstruction, baseline and scale threshold determined by wavelet multi-scale, in which the value points is obtained and curve is reconstructed automatically. Hausdorff distance is adopted to calculate the error of cubic B-spline curve reconstruction. Comparative analysis with existing methods proves that our method can effectively restrain noise and quickly reconstruct contour curves.
Application of Reverse Design in Wine Packaging Container Design
Authors: Zhang Ling Yu , Luo Huai Lin , Xu Gang , Zhou Yang
Published: September 2013

Proposed application the reverse design in development design process of wine packaging container, treated the the key technical problems, reconstructed the CAD model of wine packaging container,and redesigned specific elements of wine packaging container based on current development trends and the main appeal points of wine packaging container design with the the CAD model to achive the final design scheme. The application example of reverse innovative design of wine packaging container is given.
Parallel Ant Colony Algorithm Based on Award-Punishment Mechanism and its Application on Wireless Sensor Network Routing
Authors: Yang Hai
Published: September 2013

As a new method of obtaining information and disposal pattern, wireless sensor network has been a hot issue nowadays. In this paper the network model and energy consumption model of wireless sensor network are introduced firstly. The improved inspiring factor takes energy into account. Then a parallel ant colony algorithm based on award-punishment mechanism is proposed. The experimental results show that the energy consumption and time delay of the improved algorithm are superior to energy efficient ant based routing and basic ant colony algorithm.
Study of Topology and Control Strategy of the Bidirectional Energy Storage Converter Based on Three-Level
Authors: Tang Hong Wei , Chen Xi Kun , Gao Yan Xia
Published: September 2013

To adapt to the requirements of the charging and discharging of the lithium battery, the paper presents a three-level based bidirectional energy storage converter topology.It has strong adaptability and can manage the charge and discharge of multi-series and parallel battery module. The mathematical model of the converter is analyzed, and the two operation modes of the converter control strategy are studied; Analysis the feed-forward decoupling control of three-level rectifier, and the variable scale factor is used to control midpoint potential. The simulation results demonstrate the feasibility of the design.
Determination and Analysis of the External Load Change Characteristic of Loader Steering Cylinder
Authors: Xu Li Chao
Published: September 2013

Aiming at present method deficiency of getting loader oil-cylinder external load, this paper reserached the determination method of loader steering-cylinder external load change characteristic. After establishing the mathematic model of steering cylinder external load, we actually tested and processed oil pressure and piston displacement when loader shovelling semihumid soil, and obtained the change courses of piston displacement and oil pressures of rodless and rod chamber under a single typical operation cycle. In the paper, we applied matlab to fit oil pressure and piston displacement at different operation segments of the obtained single typical operation cycle, and by the programming process, we acquired the external load waveforms of steering cylinder different operation segments, after merging each segment waveform with nsoft software, we obtained the change characteristic curve of steering cylinder external load when loader shovelling semihumid soil. The analysis shows that the determined change characteristic of steering cylinder external load was consistent with the actual condition.
Systematic Design of Electronic Steering Wheel in Steer-by-Wire of Engineering Vehicle
Authors: Wang An Min , Tang Ming
Published: September 2013

This paper introduces a design of electronic steering wheel system of steer-by-wire. The whole system applies incomplete gear mechanism to save transmission space, and the design of stop dog mechanism can not only realize operating mode conversion under any condition, but aslo freely design force transfer characteristic and angle transfer characteristic of vehicle steering system, thus it is a renovation in steering system of engineering vehicles.
Developing and Research on Liquid Level Control System of Double-Tank
Authors: Chang Rui Li , Han Jun , Cui Guo Wei
Published: September 2013

In the paper, the liquid level control system of double-tank is built, which bases on MCGS configuration software. Taking the liquid levels of double-tank as control object, the mathematics model is built, which is used for experiment and research. Moreover, the liquid level PID adjustor of single tank is designed, and P, PI and PID experiments are done in the step signal, which has important practical significance and reference value.