bluuebunny/crossref_metadata_2025 huggingface dataset:
An Improved Algorithm on Adaptive KLT Vision Tracking
Authors: Liu Yuan Min , Tian Lian Fang
Published: March 2013

In view of the shortage of the KLT (Kanade-Lucas-Tomasi) tracking algorithm, an improved adaptive tracking method based on KLT is proposed in this paper, in which a kind of filtering mechanism is applied to decrease the effects of noise and illumination on tracking system. In order to eliminate the error of tracking, the strategies based on forward-backward error and measurement validity are utilized properly. However, because the approach to forward-backward error makes the feature points reduce, which leads to tracking failure especially when the shapes of object change, a method for appending the feature points is introduced. Experimental results indicate that the method presented in this paper is state of the art robustness in our comparison with related work and demonstrate improved generalization over the conventional methods.
An Algorithm to Improve the Quality of Service in Mere Network
Authors: Zhao Guo Fang , Yan Zhan You
Published: March 2013

Transmission of traffic in optical network, the network may interrupt transmission because some component failures. In order to avoid such things, and in order to ensure a reliable business streaming, we proposed an algorithm to improve the service quality of the optical network. This algorithm is that some links used the protected road in the optical network link. In addition, this algorithm also supports traffic grooming. By this algorithm, the success rate of the users establishing a connection can be improved, and the quality of service of the network can be ultimately improved.
New Aluminum Foam/Polyformaldehyde Interpenetrating Phase Composites Prepared by Injection Molding
Authors: Su Yang , Long Chun Guang , Zhou Yang , Cao Tai Shan , Hua Man Yu
Published: March 2013

A new type of interpenetrating phase composite was formed by filling 70%-porous open-cell aluminum foam with polyformaldehyde through injection molding process. The results showed that both mechanical properties and tribological behavior of composites were improved. The interphase behaviour of aluminum foam/polyformaldehyde composites was examined by scanning electron microscopy(SEM).The worn surfaces of composites were also examined and discussed. It could be indicated that injection molding and Al foam surface preprocessing including both alkaline wash and KH550 treatment for Al foam/ POM composites was available. The new composite could be used where moderate strength and wear properties are needed.
3G Mobile Network Management in the Management Information Model System Design
Authors: Liu Hui Lin , Tian Da Feng
Published: March 2013

With the improvement of mobile communication network communication equipment intelligent level and the growth of the business needs, network management is also increasing the accuracy and timeliness requirements. And due to the lack of multi-disciplinary network of integrated network management system, it is difficult to conduct unified management of network resources, maintenance, scheduling and optimization. The based on TMN basic theory, analysis of network management information model, the design of management information model system (MIF) in the 3G mobile network management application framework, the level of clarity of the framework to facilitate the use of standardized information model abstraction, has a good reusable and scalability characteristics; unified NMS network element management, and thus laid the foundation to provide integrated access reference for the design and development of next-generation mobile network management system based on the framework enables.
Near-Field Acoustic Holography of Cyclostationary Sound Field
Authors: Peng Min
Published: March 2013

The radiated sound field of rotating machinery or reciprocating machinery has a significant periodically time-variant nature. This is a kind of non-stationary sound field and called cyclostationary sound field. In the conventional planar near-field acoustic holography(PNAH), this kind of sound field is treated as stationary field, so the information relating to the change of frequency with time will be loss inevitably. In this article, the cyclic spectral density(CSD) instead of the complex sound pressure was adopted as reconstructing physical quantity in the PNAH, and the cyclostationary PNAH(CPNAH) technique was proposed. Meanwhile, focusing on the calculation complex of CSD and the accuracy of the cyclic nature extracted, the gathering slice method of CSD was proposed by referring time aliasing methods on time series. The experiment results illustrate that the cyclic nature of cyclostationary sound field may be extracted directly and the location of the source determined exactly as well.
Computing Surface Parameter of Conic Aspheric Mirror with Singular Value Decomposition
Authors: Luo Yong
Published: March 2013

The result of null testing is usually used as the criterion in the fabricating process of aspheric mirrors. To ensure the accuracy of paraxial radius of curvature and conic constant is important when the null compensator emerges a problem. From the equation of conic aspheric mirror, we derive a set of algorithm from which the paraxial radius of curvature R and conic constant k can be obtained by using Singular Value Decomposition (SVD) method. The simulating result of an aspheric mirror with an aperture of 1229mm is presented and the solving precision reaches △R=0.1% and △k=0.14%. Thus the supplement to null testing of aspheric mirror is achieved effectively.
An Experimental Study on Adaptability of a Novel Living Polymer Used in Low Permeability Fractured Reservoir
Authors: Li Li
Published: March 2013

In this paper, the produced water in Daqing oilfield was detected, includes the viscosity and concentration ratio of living polymer (LH-1), interfacial tension and swelling rate of particle polymer (LHP-1). And its adaptability in low permeable fracture core was also tested. The results show that the injection property is good if the living polymer (LH-1) and the particle polymer (LHP-1) are used together, the volume-expansion particle polymer can effectively plugging the high permeable layer in bottom of the reservoir and improve water injection profile. The best injection volume of LH-1is 0.32 PV, and enhances oil recovery rate is 18.4%.
Design and Construct for Non-Isomorphism Block
Authors: Xu Zhao Di , Li Xiao Yi , Chou Wan Xi
Published: March 2013

This paper clarifies the basic idea of design and construct for non-isomorphism block. The method of using standard edge matrix to structure block design is proposed, the whole process to design and construct (14, 8, 7, 4, 3) and (18, 9, 8, 4, 3) is introduced. It uses the side of each column of the standard edge matrix exactly, and also constitutes a complete graph by arranging the edge of complete graph to the initial matrix and re-arranging it to the standard edge matrix. According to the set of edge in standard edge matrix, 14 blocks of designing (14,8,7,4,3) and 18 blocks of designing (18,9,8,4,3) are obtained. Finally, it proved the number of design non-isomorphism (14, 8, 7, 4, 3) is 5, and (14, 8, 7, 4, 3) is 1.
Design of New Aerobics Intelligent Motion Capture System
Authors: Wang Li Juan , Zhu Jia Yuan
Published: March 2013

A new aerobics intelligent motion capture system using MEMS is proposed based on analyzing key technology of recent human motion capture system which is most benefit for intelligent tutoring system. Architecture of aerobics intelligent motion capture system is designed. And core technology solutions of the system including large-scale aerobics tutoring and training motion data obtain system, multi-position micro-electro-mechanical sensors system based on wireless network and multi-source data fusion and processing system with high-frequency real-time data transmission system are put forward.
The Acoustics Fault Diagnosis of Bearings Based on Wavelet and EMD
Authors: Ma Wei Jin , Wang Mi Rui , Li Feng Lan , Wang Jun Yuan
Published: March 2013

The wavelet and EMD method are taken in order to accurately extract the fault information from the audio signal with a lot of noise. The bearings were studied for the object. This paper proposed a method based on wavelet and EMD frequency characteristics of the acoustic signal information extraction, and the method used in bearing fault feature extraction. The experimental results show that: the method can effectively extract the fault characteristic frequency of bearing.
Sub 10nm Nanopore Sculpturing with Focused Electron Beam on Single Layer Graphene Oxide Film
Authors: Li Zhong Xian , Cheng Xiu Lan , Wang Zhi Min
Published: March 2013

DNA sequencing by nanopore is a technique to detect DNA sequence by making the DNA strain passing through the nanopore material and measureing some characteristic parameters to determine the order of the four kinds of base-pairs. Graphene nanopore research becomes a hotspot for the DNA sequencing technology. In this paper, a kind of novel nanopore on graphene oxide is sculptured with FEB(Focused Electron Beam) to overcome the problem about the high noise for graphene nanopore. By tuning FEB parameters, e.g. the accelerating voltage, the spot number, the exposure time and the amplification factor, sub 10nm nanopores on single layer GO(Graphene Oxide) film will be achieved. At the same time, some challenges are discussed: difficult to get stable size, hard to take TEM pictures and hard to get relatively smaller size.
Characteristics of the Transfer Film and Tribological Properties of Oxide/PTFE Composites
Authors: Xie Ting , Zhou Zheng Hua , Xu Zhen Xing , Yu Jian Wei , Jiao Ming Hua
Published: March 2013

The formed transfer film on the counterpart surface and tribological properties of PTFE composites filled with Al2O3 or SiO2 were investigated in this paper. The results indicated that under the same friction conditions, the friction coefficients of SiO2/PTFE and Al2O3/PTFE are very close to each other, but the wear resistance of SiO2/PTFE is superior to that of Al2O3/PTFE. According to the measured data, the micro-hardness and elastic modulus of the transfer film for SiO2/PTFE are much better than those of Al2O3/PTFE. In addition, the interfacial adhesion strength between the transfer film of SiO2/PTFE and the counterface is higher. It can be proved that the mechanical properties of transfer films for PTFE composites vary with different fillers and the friction transfer film with better adhesion strength and mechanical property is useful to improve the tribological properties of the composite.
Comparative Study of Different Source of Silica-Filled Epoxy Resin
Authors: Sun Shan , Liu Xue Qing , Liu Ji Yan
Published: March 2013

The mechanical properties and morphologies of fume precipitate and rice husk silica filled EP composites have been compared. The density, specific area of the silica decreases in the order of fume silica, precipitate silica and rice husk silica, while the silica size increases with the order above. It is shown that the fume silica/EP exhibits the highest flexural strength and modulus, followed by the precipitate silica/EP and the rice husk silica/EP. The rice husk silica/EP exhibits the highest in impact strength as silica is 1 phr. Over 5 phr of silica, fume silica/EP has the highest in impact strength, while the rice silica/EP is better than precipitate silica/EP. Scanning electron microscopy (SEM) results show that the fume silica has best dispersion and least filler agglomerates in matrix. The better dispersion will be responsible for the higher reinforcing and processing viscosity of the fume silica.
Nanogold Resonance Rayleigh Scattering Method for NO2- Based on the Phenylenediamine Diazotization
Authors: Jiang Zhi Liang , Dong Jin Chao , Liang Ai Hui
Published: March 2013

There are strong forces between phenylenediamine (PPD) and nanogold particle (AuNP) that make the AuNPs aggregation and exhibit a strong resonance Rayleigh scattering (RRS) peak at 368 nm. When there is NO2-, it reacts with PPD to generate an azo compound. However, there is weak force between AuNP and the azo compound that can’t make the AuNPs aggregation. When concentration of NO2- increased, the AuNP aggregations become weak that led the RRS peak to decrease. The decreased RRS intensity is linear to NO2-concentration in the range of 1-25 μmol/L. This method was applied to analysis of water samples with simplicity.
Study on Flammability Characteristics and Thermal Stability of Flame-Retardant PA Fibers
Authors: Zhao Jian Min , Tan Li Wen
Published: March 2013

The flammability characteristics and thermal stability were studied based on LOI, TG analysis and SEM tests. The results revealed that the additive flame retardant enhanced the flame retardancy of PA. The TG analysis showed that the thermal stability of flame-retardant PA fibers was better than PA fibers, because flame-retardant PA fibers got higher residue content and thermal degradation activation energy. The SEM images indicated the flame retardant residues were infusible, which can impede the molten dropping of PA fibers during combustion.
Removal of Heavy Metals by Poly(Vinyl Pyrrolidone)/Laponite Nanocomposite Hydrogels
Authors: Wang Yan Ming , Shang Da Ji , Niu Zhong Wei
Published: March 2013

Laponite cross-linked poly(vinyl pyrrolidone) (PVP) hydrogels were fabricated by in situ polymerization of vinyl pyrrolidone (NVP). Macroporous PVP/Laponite nanocomposite hydrogels were obtained by freeze drying of hydrogels, which exhibited faster adsorption kinetics than ambient-dried ones. We also investigated the influence of laponite content, initial ion concentration and pH of the solution on the adsorption capacity of PVP/Laponite hydrogels. Moreover, the PVP/Lapnoite hydrogels can further be fabricated into powder hydrogel samples, which can be used as a potential candidate of adsorbent for removal of heavy metals in water.
Performance Characteristics of a Magnetic Ericsson Refrigeration Cycle Using La(Fe0.88Si0.12)13H1 or Gd as the Working Substance
Authors: Wang Jun Yi , Diguet Gildas , Lin Guo Xing , Chen Jin Can
Published: March 2013

Based on the experimental characteristics of iso-field entropy varying with temperature for the room-temperature magnetic refrigeration material La(Fe0.88Si0.12)13H1 or Gd, the regenerative Ericsson refrigeration cycle using La(Fe0.88Si0.12)13H1 or Gd as the working substance is established and their thermodynamic performances are evaluated and analyzed. By means of numerical calculation, the influence of non-perfect regeneration on the main thermodynamic performances of the cycle is revealed and discussed. Furthermore, the coefficient of performance (COP), non-perfect regenerative heat quantity, and net cooling quantity of the Ericsson refrigeration cycle using La(Fe0.88Si0.12)13H1 or Gd as the working substance are compared. The results obtained show that it is beneficial to the cooling quantity of the cycles using La(Fe0.88Si0.12)13H1 or Gd as the working substance to operate in the region of Tcold >T0 and, at the condition of a same temperature span, the cooling quantity for La(Fe0.88Si0.12)13H1 is larger than that for Gd.
Study on the Method Evaluating the Stability of a New Propellant
Authors: Zhang Li , Xu Lu Tie , Du Shi Guo , Wang Qi
Published: March 2013

GATo propellant with different storage life was obtained by aging test. The stabilizers content and methyl violet test burst time of the samples were measured by GC and methyl violet test instrument. The relationships of tb vs. ta, tb vs. R and R vs. ta were determined. The results show that the variation regularities of tb with ta and Res content with ta are very similar, and the variation regularity of tb with Res content is linear relationship. In addition, the Scattering field of methyl violet test burst times is very small. So, it is feasible that the stability evaluation of GATo propellant with methyl-violet burst time.
Study on Mechanical Properties of AH32 Opened Plate
Authors: Jia Jun Li , Dong Zhong Qi , Yuan Jian Lu , Han Ti Wen
Published: March 2013

It was compared AH32 opened plate using new techology in the mechanical properties. Results showed: the mechanical properties of AH32 opened plate are the same at the classification plate. The transverse tensile stength and yield strength of AH32 opened plate have an advantage over it’s longitudinal. The transverse elongation of AH32 opened plate is below the longitudinal. It is different the mechanical properties that is made of the deformation variance of AH32 opened plate in the transverse and the longitudinal.
The Study on Residual Stress Testing of Humidity Effect and Distribution Law for PMMA
Authors: Wei Shang , Jing Yang Xiao , Cui Mao , Long Guo
Published: March 2013

Polymethyl methacrylate (PMMA) has shown some excellent performances. However the humidity environment affects mechanical properties of PMMA seriously. In this work, the digital phase-shifting photoelasticity is used to test the humidity stress of the boundary according to which we concluded that the boundary stress decreases gradually from the boundary to the inner. The mathematical model of the boundary stress distribution is established based on the distribution law of the boundary stress. This mathematical model can be used to predict the effect of the humidity environment to the boundary stress, and guide PMMA to use safely.
Study on the Erosion Wear Behaviors of the PMMA Plates Impacted by Air Flow Containing Sands
Authors: Xie Ting , Liu Gang , Wang Peng Fei , Yin Yan Guo
Published: March 2013

The polymethymethacrylate (PMMA) plate was adopted as the test samples. The effects of impact angle, impact velocity, sand size on the erosion wear of the PMMA plates were experimentally investigated. The erosion mechanisms were also analyzed. The results showed that, the erosion volume increased nonlinearly with the increase of impact velocity, the inflection point appeared at around 13 m/s, and then the erosion volume increased rapidly. The erosion volume decreased nonlinearly as the impact angle increased. In our experiments, under the impact angle less than 60°, the smaller sand size could result in higher erosion wear. However, at 90°, the erosion volume by larger sands produced higher erosion. In fact, the erosion mechanism depends on the impact angle, at small impact angles, the main erosion mechanism is micro-cutting, and the erosion mechanism will mainly be impacting fatigue at large impact angles. At the medium impact angles, the erosion mechanism is the combination of the micro-cutting and impacting.
Study of Transient Liquid-Phase Bonding of SiC Particle Reinforced Aluminum Matrix Composite
Authors: Chu Yao , Jiang Shi Hang , Fan Wei Jian , Jin Zhao Yang , Wang Du Xiong
Published: March 2013

Transient liquid-phase(TLP) bonding of SiC particle reinforced aluminum matrix composite(SiCp/Al MMCs) ,using Cu film, Cu foil, Ni foil and Cu/Ni/Cu multilayer foil interlayer, was investigated. The effect of surface status, interlayer species and bolding time on bonding microstructure and properties were also estimated by metallographic microscope, scanning electron microscopy (SEM), X ray diffraction and tensile testing machine. The results show that adding holding time can improve shear strength of joint. Better strength of joint can be obtained due to without the effect of oxide with Cu film as interlayer, when bonding at 853K for 120min under 2MPa pressure, the shear strength of bonded joints can obtain 169.1MPa, about 81.7 percentage of the strength of base material. Best strength of joint can be obtained with Cu/Ni/Cu multilayer foil as interlayer, when bonding at 923K for 120min under 2MPa pressure, the of bonded joints can obtain 189.6MPa, about 84.6 percentage of the strength of base material.
Synthesis of Magnetic Particles and Silica Coated Core-Shell Materials
Authors: Liu Wen Bao , Yang Bing Jun , Yang Wan Li , Li Wen , Yang Jiao , Gao Mei Zhen
Published: March 2013

Ferrite particles were prepared by hydrothermal process at high temperature. The characterization of ferrite was examined by XRD, Mössbauer spectrum, and SEM. The XRD and Mössbauer spectrum confirmed that ferrite particles have a Fe3O4 inverse spinel structure, the SEM results show that each Fe3O4 particles were composed of many smaller magnetite nanoparticles. The as-synthesized Fe3O4 particles were modified by sodium citrate then further coated with SiO2 layer through the modified stöber method. The composited Fe3O4@SiO2 microspheres exhibited outstanding monodispersity and magnetic property.
Effect of the Properties of Polyimide Fiber Paper-Based Materials by Different Hot Pressing Process
Authors: Lu Zhao Qing , Xu Qiang , Wu Zhen , Wang Zhi Jie
Published: March 2013

Polyimide fibers and polyamide acid fibers was used as main materials to make polyimide fiber paper. The effect of the properties of polyimide fiber paper by hot pressing temperature and hot pressing pressure was discussed. The experimental results showed that when the pressure of hot pressing was 12Mpa and the hot temperature of hot pressing was 220°C, the sheet had excellent strength properties and electrical performance.
Microwave Dielectric Properties of MgNb2O6 Ceramics Prepared via High Energy Ball Milling Method
Authors: Fu Zhi Fen , Ma Jian Li , Liu Peng , Tang Yong Xin
Published: March 2013

The effects of high-energy ball milling and subsequent calcinations on the mixture of MgO and Nb2O5 are investigated. It is found that the pure MgNb2O6 phase can be synthesized at 800 °C for 5 h by using high-energy ball milling method. MgNb2O6 ceramics were prepared at 1220 °C by using calcined powders of milled 15 h, which is lower 100 °C than that required by using the conventional solid state reaction method. The microwave dielectric properties of MgNb2O6 ceramic with εr = 19.7 and Qf = 29 044 GHz were obtained by the High-energy ball milling method, which made it a potential candidate for application.
Characterization of N719 Dye Desorption on TiO2 Nanotube Arrays Used for Dye-Sensitized Solar Cells
Authors: Qi Fang Yi , Huang Qi Yu , Jiao Fang , Zheng Yi Zhou , Gan Yu Chou , Xie Jing
Published: March 2013

In this work, we developed a method to quantitative analyze the absorption and desorption of N719 dye on TiO2 nanotube arrays. TiO2 nanotube arrays were fabricated by anodizing titanium foils in an organic electrolyte using a two-electrode configuration with a platinum mesh as the counter electrode. TiO2 nanotube arrays were then annealed under 450 °Cfor 3 hours and immersed in N719 dye solution for 24 hours. The dye-sensitized TiO2 nanotube arrays were soaked in an electrolyte solution and stored in a dark closed vessel for 76 days. Then they were desorbed by KOH solution (pH=10). According to UV-visible absorption spectra and Lambert-Beer's law, the desorption rate of N719 dye on 9 µm thick TiO2 nanotube arrays was calculated to be 36%. The results provide a valuable reference to study the dye desorption and stability of the dye-sensitized solar cells.
Refinement Effect and Mechanism of AZ31 Magnesium Alloy by Electromagnetic Stirring under the Effect of Grain-Refiner
Authors: Gao Sheng Yuan , Qu Shi Lian , Yuan Yue , Fu Bao Qin
Published: March 2013

The effects of electromagnetic stirring and Al4C3grain refiner on the grain refinement of semi-continuously cast AZ31 magnesium alloy were discussed in this investigation. The results indicate that electromagnetic stirring has effective refining effect on the grain size of AZ31 magnesium alloy under the effect of Al4C3grain refiner. Electromagnetic stirring can “activate” the Al4C3particles, resulting in more heterogeneous nucleation sites for the primary α-Mg grains. But, longer holding time can “inactivate” the Al4C3particles, and the optimal experimental holding time is 60 min in the present investigation. The activated rate of the electromagnetic under the experimental condition ρ2=1.65%.
Optimal Surface Functionalization of Nanoporous Alumina Membrane for DNA Detection
Authors: Ye Wei Wei , Yang Mo
Published: March 2013

This study shows the study of optimal surface functionalization of nanoporous alumina membrane for "label-free" DNA detection. Single stranded DNA was first covalently immobilized on the nanopore walls via silane-PEG-NHS linker. The remained NHS group was hydrolyzed to form PEG layer to minimize the unspecific DNA binding during hybridization process. Optimal PEG-silane linker was achieved for better DNA immobilization efficiency. Using this optofluidic device, both ss-DNA immobilization and ds-DNA hybridization were successfully monitored via UV-Vis spectrum montoring. The nanopore size effect on DNA binding efficiency of membranes were also studied. With the increase of nanopore size, the DNA binding efficiency increased due to the increased reacted surface area. This portable optofluidic device integrated with nanoporos alumina membrane has the potential for nucleic acid in field detection in the application of food screening and environmental monitoring with high sensitivity
Surface Treatment Effect on Measurement of Welding Residual Stress Using X-Ray Stress Analyzer
Authors: Zhang Zhu Wu , Yao Qin , Wu Ai Ping , Gong Ling Zhu
Published: March 2013

The effects of welding residual stress (WRS) would be harmful to safety and intensity of pressure vessel. X-ray stress analyzer (XRSA) can be used to non-destructively quantitative analyze WRS. In this study, stress changes of constant stress beam in loading process were tested using strain gauge (SG), strain rosette (SR) and XRSA, and their test results were compared to analyze measurement errors of XRSA. It was found that the property of XRSA meets the experimental requirement. The machining stress in surface of welding test plate could be completely removed after 4 min electrolytic polishing under 1 A current and 100% NaCl electrolyte. The WRS of welding test plate was tested by XRSA after machining stress completely removed, and its distribution along vertical welding seam direction corresponded with theory calculation. Furthermore, XRSA as a non-destructive method will be more used to study WRS of pressure vessel, so these results can provide scientific basis for the studying.
The Stress Laws of H-Beam Rolling Deformation during Rectangular Billet Cogging-Down
Authors: Chen Lin , Chang Guo , Liu Shu Qin , Bi Ke Xin
Published: March 2013

In order to ensure H-beam’s organization and performance requirements, there is a certain compression ratio from the rolling of the billet to the finished product. This paper select rectangular billets and use DEFORM finite element software to simulate and analyze the rules of stress variation when rectangular billet is cogged down. The simulation results show that: from rectangular billet to finished product, the compression ratio is 17.4 and after cogging, billet size meet the requirements of the CCS rolling. The equivalent stress of breakdown rolling is mainly concentrated in the waist or in the junction of waist and legs. In the first few pass，equivalent stress is mainly concentrated in Sharp-angled position of both top and bottom, however the next few pass’s equivalent stress is mainly concentrated in the junction of web Plate and flange.
Study of Low Carbon Low Alloy Steel Annealing Process Parameters Optimization
Authors: Zhao Mao Yu , Chen Qian Wang
Published: March 2013

A suitable match of annealing process parameters is critical for obtaining the fine microstructure of material. Low carbon low alloy steel (20CrMnTi) was heated for various durations near Ac temperature to achieve fine pearlite and ferrite grains. Annealing temperature and time were used as independent variables, and material property data were acquired by orthogonal experiment under intercritical annealing followed by subcritical annealing process (IASAP). The weights of plasticity (hardness, yield strength, section shrinkage, and elongation) of annealing material were calculated by analytic hierarchy process, and then the process parameters were optimized by using the grey theory system. The results observed by SEM images show that the optimized material microstructure consists of refining and distributing uniformly ferrite-pearlite grains, and smaller lamellar cementites. Morphologies on tension fracture surface of the optimized material indicates that the numbers of dimple fracture show more finer toughness obviously comparing with other annealing materials. Moreover, the yield strength value of the optimized material decreases apparently measured by tensile test. Thus, the new optimized strategy is accurate and feasible.
Simulation of Machining of Incoloy 907 Based on Thermodynamical Constitutive Equation
Authors: Shao Fang , Li Fa Qing , Zhang Hai Ying , Gao Xuan
Published: March 2013

Aero-engine alloys (also as known as superalloys)are known as difficult-to-machine materials, especially at higher cutting speeds, due to their several inherent properties such as low thermal conductivity and their high reactivity with cutting tool materials. In this paper a finite element analysis (FEA) of machining for Incoloy907 is presented. In particular, the thermodynamical constitutitve equation(T-C-E) in FEA is applied for both workpiece material and tool material. Cutting temperature and cutting force are predicted. The comparison between the predicted and experimental cutting temperature and cutting force are presented and discussed. The results indicated that a good prediction accuracy of both principal cutting temperature and cutting force can be achieved by the method of FEA with thermodynamical constitutitve equation.
Analysis and Research on Curved Parts Cutting Process Physical Simulation and Parameter Optimization
Authors: Shen Yi Li
Published: March 2013

With the development of parts processing technology, the machinery industry has also brought about great development. In this paper, using the computer technology carries out research on the surface machining process physical simulation, through the research on kinetic equation characteristics of surface parts in the cutting process, to establish simulation model. Then, according to the computer system to carry out parameter optimized, it can get the need of parts cutting’s perfect surface equation, speed, cutting time and other parameters. At the same time, through the simulation optimization system design, it can provide parameters basis for precise control of curved surface parts cutting process.
A Study on Weldability of Aluminum Alloy-Aluminum-Steel Transition Joints
Authors: Wang Jian Min , Zhang Yan
Published: March 2013

Aluminum alloy-aluminum-steel cladding plates were manufactured by explosive welding. Microstructures of the cladding plates were observed and the interface bonding properties were tested. Aluminum alloy-aluminum-steel transition joints were produced by welding the explosive cladding plates. The bonding interface configuration and property were investigated and tested after welding. The effects of welding technology on the interface bonding properties were discussed. The results showed that metallurgical behavior has been occurred at the bonding interfaces between aluminum alloy and aluminum and aluminum and steel. Regular sine waves have appeared on the bonding interface between aluminum alloy and aluminum. However, the bonding interfaces between aluminum and steel present line-shape. The shear strength and separate strength of the cladding plates were much higher than the standard strength. After being welded, the configuration of the bonding interface has no marked change. The strength of the bonding interface decrease a little. The welding technology had no remarkable effect on the bonding interface of the aluminum alloy-aluminum-steel cladding plates.
Research about the Influence of Loading History on the Rock’s Thermal Cracking Fracture
Authors: Xie Wei Hong , Zhou Nan , Shen Hai Feng , Zhang Feng
Published: March 2013

The research on the history of load and temperature to the influence of rock’s damage and fracture is rare. Commonly, it takes no account of the order of load and temperature and despite how the load’s history which arose its damage of thermal fracture is, the process of damage evolvement and the intensity of fracture is same as long as adds of carry is similar to temperature value. However, the thermal influenced by the history of adds of temperature and the result will be different under different order of adds of carry. This paper carries through meso-structure experiment of different order of adds of carry and temperature by the numbers, observe the process of limestone’s thermal crack damage under the different order of adds of temperature and carry on real time with instrument such as DaoJin High Temperature Fatigue Testing System with Scanning Electron Microscope. In the view of the rock’s tiny crack growth, compute its crack tip energy release rate under different order of adds of carry. The result of theory and experiment indicate that the fracture of rock’s thermal cracking are intensively influenced by the history of adds of carry.
Reinforcement Design for Composite Laminate with Large Cutout by a Genetic Algorithm Method
Authors: Sun Zhong Lei , Zhao Mei Ying , Luo Li Long
Published: March 2013

A dual-zone reinforcement ply stacking sequence optimization method used for comosite laminate with large cutout is present. The optimization method utilized a new Genetic Algorithm. The new Genetic Algorithm introduced a new strategy which can improve the efficiency of the traditional Genetic Algorithm and overcome the shortages of the worse convergency and prematurity of the Simple Genetic Algorithm. In the new Genetic Algorithm, the selection probability and the mutation probability are self-adaptive. Compared with the Simple Genetic Algorithm, the new Genetic Algorithm method shows good consistency, fast convergency and practical feasibility. By using the new Genetic Algorithm, the reinforcement ply stacking sequence optimization method got reasonable symmetric and balance stacking sequence which could meet the design requirements.
The Rietveld Refinement of Thermal Synthesized Rhombohedra Boron Nitride Micro-Rod
Authors: Yang Xiao Jing , Li Lan Lan , Zhang Xin Hua , Shi Pan , Tian Yue , Li Xiang , Tang Cheng Chun
Published: March 2013

We reported on a convenient route to synthesize rhombohedra boron nitride (r-BN) micro-rod using urea (CO(NH2)2) and sodium borohydride (NaBH4) through thermal treatment at 1300 °C. The structure, morphology, and chemical composition of the obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). In order to determine the phase composition and abundance of the as-synthsized simples, Rietveld refinement has been performed to analyze the XRD data using the Rietan-2000 program. The results show that the abundance of r-BN is about 90.6 wt % and h-BN is 9.4 wt % deduced from Reitveld refinement.
3-D Numerical Modeling of Ultrasonic Guided Wave Testing for Defect in Rock Bolt
Authors: Lu Chao , Xia Long Yu , Zheng Ming Fang
Published: March 2013

It is important for evaluating the condition of rock bolts to theoretically investigate the propagation of elastic waves in Rock bolt .In this paper, ultrasonic guided wave propagation and the interaction law with the artificial corrosion ring defect in the solid cylinder were studied through the rock bolt was modeled as a cylindrical. A large number of numerical simulation experiments were carried out using finite element method based on ABAQUS, The longitudinal mode of the propagation characteristics and law were analyzed in the solid cylinder, and the best excitation model and frequency were selected for the signal dispersion by combining curve with wave structures knowledge. The outcome of this research indicated that L(0,1) reflection coefficient is increased as well as during the depth incremental change when given a particular axial length; With the increment of the axial, L(0,1) and F(1,1) of the reflection coefficient maintain the similar trend when the ring defect depth coefficient 10%.
Research on the Limiting Inner Pressure of Metallurgical Composite Bimetallic
Authors: Zhao Li Xin , Li Chun Qiang , Zheng Li Yun , Wang Li Hui
Published: March 2013

The metallurgical composite bimetallic tube, Incoloy825/X60, has been manufactured by a novel centrifugal casting plus extrusion compound technique. Based on the Incoloy825/X60 bimetallic tube, the limiting inner pressure and stress distributions were investigated by the finite element analysis software ABAQUS. The results indicate that the pressure-resistant capacity of the metallurgical composite bimetallic tube is equivalent to the internal metal in elastic state while the limiting inner pressure is much larger than the single metal tube with the same sizes in plastic state. The pressure-resistant capacity of the metallurgical composite bimetallic tube has increased more than two times compared with the external metal tube because of the transition layer which has a complete metallurgical bonding.
Study on the Aerodynamics Mechanism of Passenger Car under Unsteady Crosswind
Authors: Shen Chen , Zhu Hui , Yang Zhi Gang
Published: March 2013

Regular formulae for lateral aerodynamic force cannot give precise prediction under unsteady crosswind. By generalizing potential flow theory and taking the aerodynamic derivative into consideration, the semi-empirical expression for lateral aerodynamic force is derived. In order to determine the coefficients in the semi-empirical formula, the model of a typical double-deck coach is investigated in a sequence of numerical simulations under pure crosswind condition (i.e. linear crosswind, pseudo-step crosswind, sinusoidal crosswind). Moreover, advantages of the semi-empirical formula over the regular one are revealed. Further inspections into the flow field derived from the theory of vortex motion indicate that the deviation between the prediction given by semi-empirical formulae and that by numerical simulation is caused by the non-viscous assumption in potential flow theory. The lateral aerodynamic force depends linearly on the crosswind aerodynamic derivative. Situations in which the coach is moving in the direction perpendicular to the wind velocity are also studied to find the cause of the error in semi-empirical formula. Furthermore, the semi-empirical formula is revised by introducing the “damping model method”. A relatively complete system of prediction for lateral aerodynamic force on a coach, which is of practical engineering significance, has been constructed.
Preparation of TPU-Polyester Coated Fabrics with High Adhesive Performance
Authors: Zhou Chang Cheng , Li Zhong Dong , Wang Zhao Jun , Ma Yan
Published: March 2013

In this paper, two kinds of adhesives were introduced into the treatment on polyester fabrics, and all achieved after calendered conjointly with TPU. Then the standing against of water was investigated too.
Finite Element Analysis and Optimal Design for the Derrick of Workover Rig
Authors: Fu Hu Dai , Yang Wei , Wang Shan Gang
Published: March 2013

It proposed the finite element analysis to the derrick of workover rig in the paper. The stress distributing rule of derrick has been found, based on the finite element analysis of established derrick model. It analyzed the reasons for the effects of derrick thigh stress due to the derrick sustentation disposal format, the function of doorframe structure and the producing of dangerous section. The optimal derrick structure has been made up after calculating the derrick working stress, stress state and displacement measure.
Stimulation on Anti-Shock Characteristic of Diesel Engine
Authors: Peng Min
Published: March 2013

With more and more attention being paid to anti-shock of the warship by many country’s navy, it is of practical significance to study the anti-shock characteristic of the diesel engine which belongs to the A class facility on warship. Owing to the high price of shock test, simulation combined with partial shock test methods are adopted by many countries to ensure the facility’s anti-shock performance. A numeric virtual platform of TBD234V6 diesel engine generator set is built by means of software MSC.ADAMS and four machine feet of the diesel engine are modeled flexibly. The virtual shock test of the generator set is conducted on this platform according to the German shock standard BV043/85 and anti-shock performance limits of the machine feet is obtained. Hammer experiment is also carried out on the real generator set. After the comparison of the simulation results and the experiment results, the deficiency aspects need to be improved are pointed out at last.
The Design and Application of the Guide Rod of PROTOS Cigarette Machine
Authors: Liao Y.P. , Chen Z.J. , Fei Cheng Cheng
Published: March 2013

When the PROTOS cigarette machine for paper printing system is expanding the cigarette paper, it produce a lot of dust which easy to adhere to the ink roller and stamp fonts gap, leading to the cigarette stamp dirty, fuzzy cigarette product quality defects. To solve this problem, a negative pressure vacuum system is installed inside the guide rod of the cigarette paper, which help to discharge the cigarette dust to the dust removal system, and improve guide ring of the guide rod to reducing the friction. The application results show that the negative pressure vacuum is an effective solution to solve the dust floated problem. The unqualified rate reduce from 161.3PPM to 26.1PPM.It improve the effective operation of the device and ensure product quality.
Optimum Structural Design of the Hull on Jack-up Platform
Authors: Tang Wen Xian , Tang Zhen Xin , Xia Tian , Zhang Jian
Published: March 2013

The system design and optimization of the hull of a jack-up platform was presented in the paper, based on finite element method and size optimization theories. Three-dimensional model of the hull was made by the design parameters, the size and the layout of the various compartments were determined. The finite element model was built, the analysis and calculation of the hull in some load-cases requested in the China Classification Society were done. The thickness of the steel plates were optimized to be less based on the analysis results. The results show that a big displacement of the side plate is produced because of the wind load, there is large stress at the main deck and the inner bottom deck due to the variable load and ballast water. After finishing the size optimization, the stress of hull increases and the stress is more evenly distributed, and the mass of hull is down. The utilization of material increases effectively.
Functional Biomaterial Poly-γ-Glutamic Acid Designed for Thermostability of Zearalenone-Degraded
Authors: Yang Ge , Che Cheng Chuan , Liu Yan
Published: March 2013

The influence of different additives (poly-γ-glutamic acid, polyethylene glycol) on the thermostabitity of zearalenone-degraded enzyme at 70°C has been studied in aqueous medium. The results obtained show a stabilizing effect in the presence of poly-γ-glutamic acid (ethylene glycol, glycerol, erythritol, xylitol, and sorbitol) and for most of the γ-PGA-PEG used. The influence of the monovalent ions on zearalenone-degraded enzyme thermostability can be correlated to the lyotropic series of Hofmeister.
Research on Performance of Coal Mine Refuge Chamber Reinforcing Ribs
Authors: Ou Bing Xian , Yan Jun Xia
Published: March 2013

The coal mine refuge chamber is the necessary production of emergency system used in the underground coal mine. It can be installed conveniently and moved with the workplace. So it is more widely applied. The composition and basic performance requirements of coal mine refuge chamber were introduced in this paper. The performance of reinforcing ribs was done by finite element analysis software ANSYS Workbench and the performance optimization method of square tube reinforcing ribs thin plate was proposed. It can provide some reference for the design and performance research of refuge chamber bulkhead.
A Method of Measuring Laser Divergency Angle by Focus Spot Method Based on Comparative Measurement
Authors: Li Yan Feng , An Zhi Yong , Wang Jin Song , Xu Zhi Gang , Zhu Hai Bin
Published: March 2013

his paper is based on image processing techniques, combined principle of Matrix CCD and image grabbing card , measured divergency angle of laser by focus spot method. In windows environment, using VC++ develop tools, achieved De-nosing and recognition of image and the measuring of laser divergency angle. A standard laser which of divergency angle is known is measured with focus spot proposed by the paper, the relative error ≦ 5%，which meets demand of test precision.
Simulation Study on Virtual Prototype of Pumping Well System
Authors: Yang Hu Kun , Zhan Gui Chuan , Cao Yan Peng , Yang Jing Yuan , Qin Li Feng
Published: March 2013

The virtual prototype simulation of the underground pumping system can’t realize the timing analysis with the ground pumping unit system. In order to solve this problem, the simulation analysis model of the pumped well virtual prototype was established via the multibody dynamics simulation software Adams by analyzing the working characteristic of the sucker rod string. The simulation was in accordance with the dynamic indicator diagram which verifies the correctness of the simulation analysis model of the pumped well virtual prototype and also offers a new analysis method for the underground pump dianamograph and pumping unit balance, etc.
Investigation of Dental Biomaterials under Load Using a Digital Image Correlation System
Authors: Lemic Aleksandra Milic , Sojic Ljiljana Tihacek , Tanasic Ivan , Subic Aleksandar , Grubor Dragan
Published: March 2013

The digital image correlation method was used in this study to investigate heat polymerizable acrylic resin, which is the material of choice for prosthesis in edentulous patients. The aim was to analyze and determine the force-induced displacement and strain of a complete denture in the physiological force field of edentulous patients. An acrylic lower complete denture was made for the edentulous mandible, placed on the residual ridge of the macerated mandible bone, lacquered with spray, and exposed to a force of 300 N. The Digital Image Correlation system (DIC) (GOM, Braunschweig, Germany) was used to measure the strain in the complete denture, consisting of two digital cameras and the software ARAMIS (6.2.0, Braunschweig, Germany). Both fields indicated the maximum dimensional changes occurred just below the point of force incidence. The displacement field registered movements in the range from 0.165 to 0.782 mm and the principal strain field showed strain values between 1.25 and 18.94%. In vitro investigation of the dynamic behavior of the lower complete denture under load by using the optical measuring system-DIC demonstrated that the strain/displacement alterations were generally influenced by prosthesis movement toward the residual alveolar ridge.
Nanophotonic Rigid Contact Lenses: Engineering and Characterization
Authors: Koruga Đuro , Stamenković Dragomir , Djuricic Ivan , Mileusnic Ivana , Šakota Jovana , Bojović Božica , Golubovic Zorana
Published: March 2013

Contact lenses are a common optical aid to provide help with refractive anomalies of the human eye. Construction of contact lenses is a complex engineering task as it requires knowledge of optics, materials science, production and characterization methods for product quality. Besides correcting refractive anomalies, by using contact lenses it is possible to change the characteristics of light through the manipulation of material structure properties. Nanomaterials, such as fullerene C60, are candidates for the medium that interacts with light, thus changing its properties. During material syntheses for contact lenses, fullerenes are added to the base material and optical characteristics of the new nanophotonic material are compared with the base material. The engineering, manufacture and characterization of both a commercial and a new nanophotonic contact lens is presented in this paper. The interaction of water with both base and nanophotonic contact lens materials is described. Using experimental techniques, the phenomena of an exclusion zone (EZ) is also identified.