bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Friction and Wear Properties of the NBR under Dry Sliding and Water Lubrication
Authors: Yang Feng Yan , Wang Shi Jie , Lv Xiao Ren
Published: September 2013

The wear mechanisms of different graphite contents of NBR by 45# steel under dry sliding and water lubrication were investigated. On MPV-600 computer-controlled abrasive wear testing machine, the coefficients of friction were measured continuously. Results showed that under dry sliding condition, the rubber wear loss is big, the coefficient of friction is higher, the temperature of the friction surface is rise obviously. Wear loss and friction coefficient of NBR decrease with the increase of graphite contents; With the increase of graphite contents wear loss and the friction coefficient decreases, and is mainly due to the graphite lubrication performance and increase the stiffness of the rubber contact area. At low content of graphite, adhesive wear of NBR is showed, in the high content of graphite, abrasive wear is showed. Water lubrication condition, wear surface level off, the wear loss is very small, and the lubrication and cooling effect of water makes the friction coefficient decrease. Graphite content is higher, the wear loss and coefficient of friction is smaller.
Research on the Whitening Mechanism of Kaolin by Chemical Bleaching and Calcining
Authors: Lu C.H. , Fang M. , Lai H.X. , Huang L.Q. , Chen J. , Fu C.L. , Li J.T. , Luo X.T.
Published: September 2013

Bleaching and calcining are the major whitening process in kaolin industry. However, the whitening mechanism has not been clarified yet. In this paper, the whitening mechanism of kaolin was investigated. Kaolin was bleached with hydrosulfite and calcined under different temperature separately, the whiteness and microstructure were detected throughly by X-ray diffraction and scanning electron microscope. The soluble and insoluble Fe content were determined by phenanthroline spectrophotometry. Effect of chemical bleaching, calcined temperature on mineral characteristics and whiteness was discussed. The mechanism of whitening was analyzed systematically.
An Improved Artificial Immune System Model
Authors: Li Gui Yang , Guo Tao
Published: September 2013

nspired by the theory of biological immune receptor editing/revision, an improved artificial immune system model is proposed. Different from generic model, the improved model does not need to set the detectors detection radius, but it gives the detector a certain degree of learning ability through receptor editing and receptor revision. This makes the detector has a capability to adjust the detection position and detection radius automatically. Experimental results show that the improved model achieves better detection performance than generic model.
A Framework for Object-Oriented Data Mining Based on Higher-Order Logic Programming
Authors: Zhang Zhi Ping , Li Lin Na , Wang Li Jun , Yu Hai Yan
Published: September 2013

Data mining discovers knowledge and useful information from large amounts of data stored in databases. With the increasing popularity of object-oriented database system in advanced database applications, it is significantly important to study the data mining methods for object-oriented database. This paper proposes that higher-order logic programming languages and techniques is very suitable for object-oriented data mining, and presents a framework for object-oriented data mining based on higher-order logic programming. Such a framework is inductive logic programming which adopts higher-order logic programming language Escher as knowledge representation formalism. In addition, Escher is a generalization of the attribute-value representation, thus many higher-order logic learners under this framework can be upgraded directly from corresponding propositional learners.
Research on Modeling and Control Strategy of Parallel Hybrid Electric Back-Loading Compression Sanitation Vehicle
Authors: Yang Rong , Lou Di Ming , Tan Pi Qiang , Hu Zhi Yuan
Published: September 2013

Establish simulation models of the conventional and parallel hybrid electric back-loading compression sanitation vehicle by AVL CRUISE and MATLAB/Simulink software. Study on control strategy of parallel hybrid electric vehicle based on the work characteristics of back-loading compression sanitation. Results show that: about 24.5% fuel consumption reduction in hybrid modeling compared to the conventional sanitation vehicle under heavy commercial vehicle standard test cycle (C-WTVC, Adapted World Transient Vehicle Cycle), and battery SOC was little changed at 50%. About 32% fuel consumption reduction in hybrid compared to the conventional vehicle under the actual road testing spectrum, and SOC increased about 21.6% relative to the initial state. It controls the engine to work in more stable operation region and reduces engine idle time, but increases engine start-stop times. It also could provide some references for specific engine development of parallel hybrid electric vehicle
Theoretical Investigation of Transient Lubrication in Spur Gear
Authors: Panichakorn Jesda , Wongseedakaew Khanittha
Published: September 2013

This paper presents performance characteristics of transient thermo-elastohydrodynamic lubrication (TEHL) in line contact with Newtonian fluids. The time-dependent modified Reynolds equation, energy equation and elasticity equation with initial conditions were solved numerically using finite different method, Newton-Raphson method and multigrid multilevel method for an involutes spur gear to obtain the film pressure profiles, film thickness profiles, film temperature and friction coefficient in the contact region. In this analysis, the load is applied on either two pairs or one pair of gear teeth. The simulation results show that at approach point, the film thickness is minimized and film temperature rapidly increases. Film temperature and friction coefficient were suddenly increase when the transition from two pairs to one pair and vice versa are modeled as a step variation of load. The friction coefficient and film temperature were occurrence at pitch point. Film temperature and friction coefficient increase but film thickness decreases when applied load increases. For increasing of speeds, film thickness and film temperature increase but friction coefficient decreses.
Modification Research on the Water-Resistance of Magnesium Oxychloride Cement
Authors: Yuan Zi Yao , Liu Xing Long , Jia Yong Feng , Liu Peng , Li Ming Chun
Published: September 2013

The influences of fly ash and phosphoric acid on water-resistant property and the microstructure of magnesium oxychloride cement (MOC) were investigated in this paper. It is found that the improvement of the water-resistance of the MOC incorporated with phosphoric acid can be attributed to the dramatic decrease in the quantity of crystallization points. In addition, the new Mg2PO4(OH) phase can also prevent the dissolution of 5-phase. And the mechanism of the water-resistance of the MOC mixed with fly ash is due to the Ca2MgSi2O7phase and the glass phase which are filled into microscopic cracks and skeleton empty.
Effect of SiC and ZrO2 on Low Temperature Oxidation Resistance of MoSi2 Nanocomposites
Authors: Liu Chang Hong , Ai Yun Long , Liang Bing Liang
Published: September 2013

The single and synergism effect of SiC and ZrO2 nanoparticles on low temperature oxidation resistance of MoSi2 were investigated by thermo-gravimetric analysis (TGA), phase and micrograph analysis of surface film. The results show that at the oxidation temperature of 600°C, the addition of 10%ZrO2 results in obvious oxidation mass gain of MoSi2, and discontinuous protective film forming on the surfaces, which makes “pesting” phenomenon still occur. The addition of 10%SiC accelerates the oxidation of MoSi2, but compact SiO2 protective film formed on the surface after some time of oxidation, avoiding the occurrence of large scope of “pesting” phenomenon. The synergism of 10%ZrO2 and 10%SiC promotes the formation of compact, even silicate glass film on the surface of MoSi2, as a result, significantly improves the low temperature oxidation resistance of MoSi2.
Chaotic Characteristic Analysis of Concrete Fracture System Based on Lyapunov Exponent Stability Criterion
Authors: Song Jun Wei
Published: September 2013

According to the research on whole curves of strain-stress of concrete materials, the paper illustrates in evidence features of stages and shows that the discrete feature of curve often occurs in strain-softening stage. After chaotic dynamic analysis of testing datas, it presents that system of whole process of strain-stress evolves from ordered steady state to low chaotic state and then to high chaotic state along with increase of compressive strength. The linear relationship of strain-stress grows evident and the system evolves from strong ordered steady state to low chaos state. The strain-stress system before compressive strength peak is basically in weak chaotic state. Theis proposed to be the stability criterion of concrete features in different stress stages, and the is regarded as the representative value of the system stability degree. The calculation of example shows that the stability criterion definited by the proposed method is consistent with the actural situation.
Dynamic Analysis of Large Dams in Frequency-Domain Based on Fourier SEM
Authors: Tan Ping , Li Nan Sheng
Published: September 2013

In this paper, we applyFourierSpectral Element Method(SEM) to the dynamic analysis of large dams, and take advantage of its high numerical accuracy and exponential rate of convergence and excellent geometrical adaptability to improve the computational procedure, efficiency and results of dynamic problem of large dams in numerical calculation. Based on the governing dynamic equation of large dams with the boundary nonlinearity, this paper derives theFourierspectral stiffness, mass, damping matrix and equivalent load vector in terms of discreteFourierspectral series, so a spectral formulation of dynamic analysis of large dams can be reached. For the purpose of higher numerical efficiency,Fast Fourier Transform(FFT) is also adopted in this paper. AlthoughSEMhas few applications in the analysis of solid structures, this paper indicates thatSEMcould be used in solid construction such as large dams as good as other preferable fields.
LS-SVM-Markov Model for Dam Deformation Prediction
Authors: Jiang Yan Zuo , Liu He Zhi , Liu Jing Yang
Published: September 2013

In order to effectively predict aspects of dam deformation, taking effective and timely measures against the problem to ensure the safety of the dam .As a result, LS-SVM-Mc model is proposed . Namely, Markov chain based on LS-SVM prediction corrects the error, and ultimately improves the prediction accuracy. By the analysis and calculation of deformation prediction of an arch dam, you can find that the method is more in line with the actual situation, showing predictive superiority and a high prediction accuracy.so the method can serve as a new ways of dam deformation prediction,some promotional value can be gained in later work.
Earthquake Damage Investigation and Analysis of Masonry Structure in Yuxi Village - The Macroscopic Epicenter of Ms 7.0 Lushan Earthquake
Authors: Yan Pei Lei , Sun Bai Tao , Wang Ming Zhen
Published: September 2013

Damage data of 52 masonry structures in Yuxi Village which is the macroscopic epicenter of Ms 7.0 LuShan strong earthquake were summarized and analyzed to study basic seismic capacity of the rural residence in Southwest China, and the following conclusions were obtained: summarized structural features of the main rural residence structure in Southwest China that exemplified by Yuxi Village; summarized damage characteristics of masonry structure in Yuxi Village, given brief analysis of its damage causes and provided reinforcement and improvement suggestions according to the corresponding damage characteristics; analyzed general damage characteristics of the village houses in the macroscopic level based on statistically analyze seismic site survey data. The basic seismic capacity of rural residential status in Southwest China is initially grasped, and it has important reference value to understand of the damage characteristics of various types of structure, the development of earthquake disaster mitigation planning and revision of seismic design code.
The Influence of Surfactants on Crystallization of Nanocrystalline HZSM-5 Zeolite
Authors: Wei Jun Fang , Zhu Fang , Zhang Xiao Yan
Published: September 2013

With addition of surfactants, a nanocrystalline HZSM-5 zeolite was prepared by hydrothermal synthesis method. X-ray diffraction (XRD) characterization results showed that surfactants can constraint the crystallization of HZSM-5. Scanning electronic microscopy (SEM) characterization revealed that nanocrystalline HZSM-5 with more regular morphology and smaller particle size can be prepared with suitable surfactants as additives. The HZSM-5 particles were 200-800 nm in size and constructed by primary HZSM-5 nanocrystals of 3050 nm. The average particle size will grow up to 800 nm with a cationic surfactant, and decrease to 200 nm with a anionic surfactant.
Dynamic Simulation of Ballastless Railway Track System with Local Invalid Sleepers
Authors: Zhu Huai Liang , Fang Ying Dong , Yu Li Feng
Published: September 2013

Considering local sleepers supported invalidly, the dynamic analysis is presented for ballastless railway track system subjected to moving loads. The track is modeled as an infinitely Euler-Bernoulli beam with Kelvin viscoelastic foundation. The restrain conditions of system change suddenly at unsupported sleepers. Numerical simulating was carried out by the finite element discrete and Newmarks-method. Dynamic responses of system were analyzed in the case of single or multi-sleeper to be not working properly. Results show that the maximum value of displacement of track is going up 50% approximately due to an invalid sleeper occurring. The amplitude of vibration is two times increase when three sleepers to be hung up. Hence, there would be a bad effect on the vibration control of ballastless railway track system as some sleepers lose efficacy continuously.
Fabrication Using Focused Ion Beam Processing of Devices Employing Silicon-Based Nanowires Synthesized by Vapor-Liquid-Solid Growth
Authors: Sone Hayato , Nakamura Yousuke , Suda Yasuyuki , Hosaka Sumio
Published: September 2013

Undoped and B-doped silicon-based nanowires (SiNWs) were synthesized by vapor-liquid-solid growth, and SiNW devices using Au electrodes were prototyped using focused ion beam (FIB) processing. Needle-shaped thin SiNWs were formed at a substrate temperature between 1170 and 1313 °C. The average and minimum diameters of the B-doped SiNWs were 72 nm and 52 nm, respectively. According to the current-voltage characteristics, SiNW devices have ohmic properties, and the estimated resistivity of the undoped and B-doped SiNWs are about 3.8 × 103Ωcm and 1.7 × 103Ωcm, respectively.
Study on Fatigue Features of Box-Shaped Cable-Girder Anchorage for Cable-Stayed Bridges with Steel Box Girders by Model Test
Authors: Zhang Qing Hua , Cui Chuang , Li Qiao , Bai Bing
Published: September 2013

With heavy stress concentration, the fatigue of cable-girder anchorage is one of the most important issues to be considered for the design of long-span cable-stayed bridges. The cable-girder anchorage of the Sutong Bridge taken as subject investigated, the design of experiment model, the determination of fatigue load range and the mechanical features of main components are investigated. The fatigue safety of the cable-girder anchorage in design life and limit life are verified by model test. The results indicate that the accurate simulation of mechanical characteristics and boundary condition of the actual structure can be achieved by the triangular design scheme of the model test with vertical column. The load transfer mechanism of main components of cable-girder anchorage differs notably. The stress concentrations in web plates and bottom plates are predominant. Overall, Sutong Bridge cable-girder anchorage is a reasonable design, and fatigue performance can meet with the design requirements.
Analysis of the Influence of Anisotropy on Seepage Field
Authors: She Jian Bo , Tang Yong Quan , Chen Yong
Published: September 2013

The anisotropy in the dam designs is a very important factor. In order to research the influence of anisotropy on seepage field of Dalong water control dam, this paper uses the three-dimensional finite element method to analyze the seepage characteristics and evaluate the safety of the dam by comparing the change characteristics of the pore pressure and velocity of the dam under the two different conditions.
Geochemical Speciation Associated to Brine and Groundwater
Authors: Promkotra Sarunya , Kangsadan Tawiwan
Published: September 2013

Chemical speciation of brine and groundwater is examined to assess the distribution of chemical stability and behaviors of their solutions. Brine and groundwater are randomly collected from Ban Muang and Wanon Niwat District, Sakon Nakhon province. Hydrochemical parameters and also chemical compositions of their major ions are examined to evaluate the hydrochemical facies. Brine is generally indicated the Na-Cl type. For major cations, groundwater expresses mainly the sodium and calcium ions. However, brine presents dominantly sodium and potassium ions. Major anions of groundwater display principally the bicarbonate and chloride, but brine shows primarily the chloride and sulphate. The salinity zone of sodium chloride is confined only in the small area. The influence of rock salts in some areas is concerned. Relationship of Na+ and Cl-proves the stoichiometric balance of them. Chemical phases from the saturation indices consist of anhydrite, calcite, dolomite and gypsum, which found most in every sample. Generally, saturation condition of groundwater indicates the under saturation. Besides, saturation indices (SI) of brine state the super saturation for anhydrite. The anhydrite saturation index is obviously presented the supersaturated condition when the total dissolved solids (TDS) are greater than 250,000 mg/L.
Random Vibration Analysis of Grid-Controlled Electron Gun in High Power TWT
Authors: Xu Sha , Chen Ke Juan , Song Fang Fang
Published: September 2013

The pre-stressed modal and random vibration of electron gun are calculated by finite element software ANSYS Workbench. The results show that electron gun under the excitation of radial load (X direction) can be in danger of disable structure. Some measures can be taken to avoid electron gun failure due to resonance, such as replacing the materials, changing the structure of weak links and changing TWT installation to make external incentives along the axial direction (Y direction). The analysis results can provide effective reference and guidance for TWT development.
Experimental Research on the Levitation Support Way of Ultrasonic Thrust Bearing
Authors: Song Yun Guang , Fan Zun Qiang , Sun Xiao Dong , Wang Liang Liang , Tian Feng Jun , Cai Hao , Wang Xing Lin , Yang Han Lu , Quan Ai Juan
Published: September 2013

In this paper, two ways of levitation support of ultrasonic thrust bearing are disscussed. Based on the mechanism of the near-field ultrasonic levitation, the front cover of the piezoelectric transducer is designed as conical structure.The ultrasonic radiation pressure which distributes on the conical surface can be decomposed into the axial and radial supporting the levitation subject bidirectionally. Finnally contrast experiments are carried out, indicating that when the requirement of levitation mass being satisfied, the way of bidirectional support runs more stably compared with the pure way of the axial levitation support.It supposes that the way of bidirectional levitation support is more conducive to improve the rotating speed of the rotor.
Synthesis and Characterization of Poly(Methyl Methacrylate) -Grafted-Cellulose Nanofiber
Authors: Wang Chun , Li Qing , Yang Jian Hua , Wada Jun Ya , Kawai Takahiko , Kasai Yoshinori , Hayashi Hisato , Kuroda Shinichi
Published: September 2013

Poly (methyl methacrylate) (PMMA)-graft-cellulose nanofibers (CeNFs) (PMMA-g-CeNF) were synthesized by means of graft-polymerization using Azo initiator in aqueous medium. The synthesized grafted fibers were characterized by Fourier transform infrared spectroscopy (FT-IR). Then, PMMA-g-CeNF were hydrolyzed by acid hydrolysis method with different acid constant and hydrolysis time and characterized by gel permeation chromatography (GPC). Finally, PMMA-g-CeNF was characterized by thermo-gravimetric and differential thermal analyses (TG-DTA).
The Damage Mechanics Model of the Wellbore Surrounding Rock Based on Fractal Theory
Authors: Shi Rui Xiang , Ai Chi , Zhao Wan Chun , Feng Xiao Han
Published: September 2013

In order to describe the mechanical characteristics of CBM wellbore surrounding rock more accurately, the article establishes the CBM wellbore surrounding rock mechanics model based on the fractal theory. According to the pores of CBM surrounding rock and the characteristics of mass fractal, people find the macro fracture and micro fracture damage characteristics and build the relationship of any scale coal strength, damage variable and fractal dimension. According to the numerical calculation method of the surrounding rock stress, people find the surrounding rock stress calculation method and the damage distribution model of the pore fractal model and fracture fractal model.
Application of Conjugate Heat Transfer in Multidisciplinary Design Optimization of Internal-Cooled Turbine Blade
Authors: Xu Sheng Zhong , Fang Xiang Jun , Yin Zhao
Published: September 2013

The genetic algorithm was employed to Multidisciplinary Design Optimization of transonic internally cooled turbine blades based on the conjugate heat transfer (CHT) method. Firstly, a parametric modeling method was employed to model the internal-cooled blade.Comparison of the SST turbulence model with and withoutγ-θtransition model was conducted, and the influence and reason between turbulent region and heat transfer distribution was analyzed.The result shows that separation appeared after middle region of the suction surface, because of the pressure after shock wave decrease abruptly that reduce adverse pressure gradient resistance capacity of laminar flow, it leads to instability and transition, and then enter a state of turbulence, same to the heat transfer coefficient with the phenomenon of abrupt increase that impact the temperature distribution, consequently SST model with γ-θ transition is better to showcase the change of aerodynamic and heat transfer in the transition region; Then,comparing the cooling effectiveness with different number cooling holes of internal-cooled blade , four cooling channels case was the best choice in consideration of the cooling effectiveness and the manufacturing process and the cost of the blade; In the end, Automatic optimization process was set up ,andseveral optimization frameworks were achieved. With the cooling flow increase in 0.011849 kg/s, average temperature and maximum temperature were reduced by 4.92% and 1.55% respectively in the boundary conditionsoptimization, in addition to optimized the cooling flow and the cooling effectiveness, temperature distribution in the part of contrastive analysis of turbulence model was verifiable, Simultaneously it is important guiding significance for the geometry parameters optimization.
Application of Particle Finite Element Method in Axially Symmetric Fluid-Structure Interaction Problems
Authors: Gao Yong Feng , Zhang Xiang Yan , Liu Ning
Published: September 2013

A method for the analysis of the axially symmetric fluid-structure interaction (FSI) problems which has free surfaces, based on the particle finite element method (PFEM), is proposed. To solve the incompressible axially symmetric N-S equations, a stabilized formulation based on the finite calculus procedure is used in the fractional step method. The FSI problem is performed with a staggered scheme. And a flexible boundary is used between the fixed boundary and the moving boundary so as to replace the friction. The reliability of the present method is demonstrated by the comparisons of the results from the classical method and the present results for the recoil absorber simulation. The present method can improve the efficiency and veracity in the design of machines which have free surfaces.
On the Treatment of Neumann Boundary Conditions in Collocation-Based Meshless Methods
Authors: Zhang Xiang Dong , Wang Lei , Teng Da Wei
Published: September 2013

The existence of Neumann boundary is a major cause of the poor accuracy and instability of collocation-based methods. Taking a Poisson equation with Neumann boundary condition as the model, the present paper studies the effects of two different radial point interpolation shape functions and their parameters on the accuracy of numerical solutions of the equation. We also study the effects of methods including fictious point method, nodes densification method and Hermite collocation method on the improvement of numerical accuracy. By comparison of analytic and numerical solutions computed using a program developed during research, we obtain parameters of shape functions and methods of treatment of Neumann boundary conditions that can be adopted to give better numerical accuracy.
Analysis of Risk Factors for Military Parachuting Injuries among Chinese Air Force Cadet Pilots
Authors: Guo Wen Jing , Chen Yong Ren , Yang Yong Bo , Qu Gao Feng , Liu Dong Yu , Dong Qiu Yang
Published: September 2013

Parachuting injuries among cadet pilots often occur because they undergo extensive training within a short period of time. To explore the injury mechanism and to prevent injuries, this paper investigated the injury risk factors for the military parachuting of cadet pilots. A prospective study of static line parachute descents by Chinese Air Force cadet pilots was performed. The study indicates that 153 cadet pilots were injured, with a total of 168 injuries. The injury rates associated with extrinsic and intrinsic risk factors were compared and analyzed by using orthogonal multivariate analysis. Landing is the most dangerous part of parachuting, causing 88% of injuries. Extrinsic factors associated with increased injury rates are higher surface wind speed and third-generation protective boots. Intrinsic factors associated with reduced injury rates are excellent mental qualities, excellent parachuting movements, and female cadet pilots. Strengthening parachuting movements and mental qualities, approving jumps only when basic parachuting conditions are met, and improving protective equipment are recommended strategies for preventing parachuting injuries.
Picomol Assay of Nitric Oxide Screening in Biological Samples by Derivatization Combined with High-Throughput Microplate Format
Authors: Zhang Xiao Ling , Yang Qiao
Published: September 2013

Nitric oxide (NO) is a critical intra-and extra-cellular signaling molecule that mediates a broad variety of physiologic and pathophysiologic events, and has prompted rapid growth of investigations in investigating its physiology and generation mechanism of corresponding diseases. In this paper, a picomol assay of NO screening method using fluorescent derivatization combined with high-throughout microplate format has been developed and successfully applied to the determination of NO in biological samples. The satisfied detection limit and recovery of the proposed method demonstrates that it can be competent for the sensitive determination of NO in extremely small volume of biological sample.
Technological Research on CPC Product Development Process Based on Extenics
Authors: Lei Liu , Yu Fen Fen
Published: September 2013

Experts hold the same opinion that the main processing mode of manufacturing industry in 2020 is based on CPC. Manufacturing industry information that CPC stands for is a significant signal of comprehensive competition. The paper suggests applying the extenics to the field of product development process ,setting up CPCs theoretical system and overall framework supporting technology, supporting the environment through supporting environment of simulation, developing a way in which an enterprise designs innovatively and adaptively for the product development process. And on the basis, a prototype system has been developed based on a web model to drive a rapid design, optimization and management of product development process of enterprises, which provides new ideas, methods and tools for enterprises to initiate the innovative model design and adaptive design for product development process.
Development of Parameterized Simulation and Analysis System for Cylindrical Gear Based on VC++ and ANSYS
Authors: Jiang Shou Bo , Huang Bin Bing , Li Xue Yi , Jiang Shou Lei
Published: September 2013

The simulation and analysis system for cylindrical gear was developed based on the parameterized concept in this paper. The accurate modeling and analysis process was programmed by APDL. Visual C++ was utilized to carry out a secondary development for ANSYS, and the simulation and analysis system with good human-machine interface was realized. Based on the system, the parameterized modeling and analysis were performed. A parameter set of spur cylindrical gear was taken to execute a transient dynamic analysis, and the maximum values of contact stress and bending stress of pinion and wheel were respectively obtained. The simulation results show that the gear model can be created efficiently, and the boundaries can be applied accurately. The proposed system provides the basis and reference for gear strength checking.
Finite Element Analysis of the Spindle Box Structure of Large CNC Machine Tool
Authors: Lu Mo Wu , Lu Chang , Yang Xu
Published: September 2013

In order to find the spindle box structural features. We use SolidWorks to establish solid model of the spindle box, and input the data to ANSYS by data interface provided the ANSYS software, and then calculate the static stress, natural frequencies and mode shapes which will provide a theoretical basis for dynamic analysis, design optimization.
CAD Model Reuse Based on the Integrate Design History
Authors: Wu Ying Jie , Gao Qi , Liu Gang , Ji Xue
Published: September 2013

A CAD model cannot be reused efficiently because of its incomplete design information. To solve this problem, a CAD model reuse method based on the IDH (Integrate Design History) is presented. IDH is defined as full record of modeling process and related knowledge, an extended CAD model is built as the carrier of the IDH. Based on the extended CAD model, a model reuse method is proposed by taking advantage of product design guide technology. Finally, a prototype system is developed and verifies the efficiency and feasibility of this method.
Sliding Sleeve Fracturing Strength Analysis of the Ball Based on Ansys Workbench
Authors: Shang Xiao Feng , Wang Yang , Deng Wei Dong
Published: September 2013

In the oilfield development, the packer is one of important downhole tool in oilfield drilling technology, and sealing effect of the sliding sleeve fracturing ball system directly affect the packer's sealing performance. Using UG software to establish 3D sliding sleeve fracturing ball and base model. Based on Ansys workbench simulation platform, finite element analysis was carried out on the sliding sleeve fracturing ball, distribution pattern in different materials, and sealing effect. Fracturing experiments were done to verify the accuracy of the simulation analysis and ensure the sliding sleeve fracturing system reliability in practical work.
Finite Element Analysis on Telescopic Suspension Arm of Dirt-Removing Crane Based on ANSYS
Authors: Liang Dong Dong
Published: September 2013

A finite-element mechanical model is established aiming at the features of telescopic suspension arm of dirt-removing crane in practice, such as that there exist many compound modes, the range of variation in lifting weight is big, etc. The strength, stiffness and stability of suspension arm is calculated and optimized based on ANSYS (software). The result of conventional design, which is checked and revised, tallies with the measured value relatively and may provide valuable reference for the design of suspension arm, which is to some extent significant to prolonging the fatigue life of cranes.
The Design of Emergency Self-Rescued Helmet for the Earthquake
Authors: Shi Sen , Li Yu Qi , Chen Ping
Published: September 2013

Nowadays, the earthquake occurs in a high frequency, and it not only imposes great financial loss on human’s property, but also leads many people to death. And the emergency self-rescued helmet, which is designed for earthquake, aims mainly at protecting the head of people who get stuck in the earthquake. It owns the dustproof mask and a water balloon which connects to the mask. The dustproof mask can be used to avoid suffocating caused by the rising dust, and the water balloon can provide the victims with the nutrients. The helmet carries the electronic equipment which can guide people to self-rescued process in earthquake, play the music to relieve the victims’ pressure and emit the distress signal, and it can raise the possibility of victims’ survival.
Research on Contact Strength between Roller Screw Pair on Hoisting Mechanism Applied in Deep Sea Crane
Authors: Wang Hui , Tong Min Hui , Zheng Pei
Published: September 2013

Roller screw pair is the major part of the rope guiding device that used in deep-sea hoisting mechanism. This paper focuses on the contact problems of the roller screw pair. The hoisting mechanism used in the deep sea engineering has the rope with large diameter, sustaining the great rope tension force. So its important to research the contact stress of the roller screw, This paper study the impact of surface hardness of the roller on the performance of the roller screw, sums up the effect of hardness on the bearing capacity of the roller, and provides the theoretical support and references for the designing and application of this new type of roller screw in marine engineering.
Diode-Pumped Yb:YAG Thin Disk Laser with a Novel Multi-Pass Pump and Cooling Arrangement
Authors: Song Qiong Ge , Cheng Guang Hua , Zhu Jiang Feng
Published: September 2013

We demonstrate a Yb:YAG thin disk laser with multi-pass diode-pumped structure and direct water cooling device. In the pump system, four passes of the pump radiation are focused on the thin disk using a center-punched spherical lens. The thin disk serves as the window of a copper tank and is directly cooled with recycle water-contacted method. The thin disk laser has a low pump at the threshold of operation. We obtained 450 mW output power around 1030 nm in a simple F-P resonant cavity.
Customer Value Assessment towards Transport Modes of Tourism after a Natural Disaster of Scenic Spots - The Analysis Based on Choice Experiment
Authors: Liu Jiang , Li Wei , Huang Li
Published: September 2013

This study explores marginal utility of different attributes of means of transportation after a natural disaster in scenic spots and the corresponding marginal value using an analysis method of choice experiment based on marketing strategies of traffic cost. Different from prior studies, this study will first divide traffic cost attributes into three categories, including money cost, time cost, and perceived benefits. Then, to design experiments based on different cost attributes and attribute levels to combine different means of transportation, namely marketing strategies. And this study obtains scores of customers’ willingness to travel for marketing strategies by questionnaires; questionnaire asking way through and transform by questionnaire survey to combine to be two different experimental selection sets. The authors employ choice experiment to establish econometric model to regress. The paper draws the following important conclusions. Firstly, time cost and monetary cost only will affect people's choices of means of transportation. The marginal probability of time cost and monetary cost is 4.9 percent and 0.03 percent. Simultaneously, we estimate that the monetary value of the cost per unit time is 163 yuan. Secondly, for the perceived benefits variable, although the regression coefficient is not significant, We can’t come to a conclusion that whether there is new attractions does not affect customers’ choice. Meanwhile, this study shows the nature of various new attractions may affect customers’ choice for means of transportation. Finally, in addition, for other family variables, including respondent gender, age, education and monthly living expenses, their regression coefficients are not significant. The conclusion is prompted to develop the marketing strategy that discriminatory pricing policy might not effectively improve marketing benefits.
Decision Making and Economic Analysis for Accelerated Bridge Construction
Authors: Wang Zeng Zhong , Shi Bin
Published: September 2013

Accelerated Bridge Construction (ABC) is recognized as an important method to design and rehabilitate highway bridge structures. ABC is bridge construction that uses innovative planning, design, materials, and construction methods in a safe and cost-effective manner to reduce the onsite construction time that occurs when building new bridges or replacing and rehabilitating existing bridges. ABC uses both new technology and innovative project management techniques to reduce the impact of bridge construction projects on the public and to reduce bridge construction costs. In the early stages of a construction project, engineers need to assess whether elements of ABC are achievable and effective for a specific bridge location. Use of decision-making tools in early stages of planning is advocated as a mechanism for helping decision maker assess alternatives with more confidence and for preventing investment in alternatives that are more costly. In this study, a set of decision making tools, based on the Bridge Construction Index (BCI) were developed. This tool is prepared for transportation specialists and decision-makers to determine if ABC techniques are more effective than traditional construction for a given bridge replacement or rehabilitation project.
Single-Machine Scheduling with Resource-Dependent Learning Effect and Deteriorating Jobs
Authors: Fan Yan Peng , Zhao Chuan Li
Published: September 2013

This paper considers single-machine due-window assignment and scheduling with learning effect and resource-dependent processing times. The processing time of a job is a function of its position in a sequence, its starting time, and its resource allocation. The objective is to determine the optimal sequence of jobs and optimal resource allocation so as to minimize the sum of earliness, tardiness, due-windows and resource and operation time cost, the considered problem is molded as an assignment problem and can be solved with a polynomial time algorithm.
Study on Evaluation and Optimization of Major Scientific Research Projects
Authors: Huang Xiao Min
Published: September 2013

In the management of scientific research, we must optimize the configuration of funding and support the major scientific research project with higher academic value and application value. In this paper, the problem of screening and evaluation of major scientific research projects in the management of scientific research is studied. The index system for evaluating the scientific research project is designed, and two comprehensive evaluation models of scientific research projects are established based on the theory of fuzzy mathematics and grey system. It provides the basis for the objective and scientific evaluation and optimization of scientific research project.
Application of Fuzzy Mathematics in Selection Air Flow Regulating Program
Authors: Ye Wei Wei , Xie Xian Ping , Han Meng Wei , Luo Shi Yun , Li Zhen , Wang Yan Bo
Published: September 2013

Selecting the optimal air regulation scheme of mine ventilation network, the essence is to choose the network a most optimal tree and obtain the corresponding optimal cosine tree combination program.Due to a synthetic consideration of the influence of production.Management economy and other aspects on the tree selection,the air flow regulating and controlling system made by the authors is optimum It is satisfactory to use the model for the north part ventilation system of Laochang tin mine of Yunnan tin Industrial crop. It is of practical significance to combine organically air flow regulating and controlling system with mine ventilation system.
Effects of Two-Stage Solution Heat Treatments on Microstructures and Properties of Cu-Cr-Zr Alloy
Authors: Xie Hao Feng , Peng Li Jun , Wang Zeng Hui , Mi Xu Jun
Published: September 2013

Novel two-stage solution heat treatments were applied to Cu-Cr-Zr alloy to improve its properties. The influences of these treatments on the microstructures and properties of the alloy were investigated by TEM, SEM, tensile testing and electrical conductivity test. The investigation showed that with the proposed solution treatments, it was possible to obtain better properties than the properties obtained by conventional single-stage solution treatment. For example, in the case of an alloy of Cu-0.4wt.%Cr-0.1wt.%Zr, it was found that a two-stage solution treatment system (8 h at 920 °C followed by 1 h at 1010 °C) produced better combination property than the conventional single-stage solution system (1 h at 950 °C) applied by other researchers. The first stage solution treatment is crucial to the dissolution of CuZr precipitates, dissolved CuZr phase completely, at the same time precipitated Cr phase. Subsequently, excess Cr precipitates all dissolved at the second stage solution treatment. As a result, a pure matrix is obtained after such two-stage solution heat treatments.
Thermodynamic Calculation of the Precipitate in Cu-Ni-Si-Co Alloys and Experimental Investigation
Authors: Wang Jian Wei , Xiao Xiang Peng , Huang Guo Jie
Published: September 2013

An initial thermodynamic modeling of the Cu-Ni-Si-Co system was built using CALPHAD approach. The liquid phase and terminal solid solutions were described by substitutional solution model, the nonlinear compounds used sublattice model and the other binary compounds were treated to be stoichiometric compounds. Based on the experimental conditions, the thermodynamic calculations were done to predict the stable precipitates of the alloys and investigated the effect of Co on the phase transitions. The experimental results showed an acceptable agreement with the calculation and verified the reliability of the Cu-Ni-Si-Co thermodynamic modeling.
Research of the Elevator Monitoring System Based on the Internet of Things
Authors: Tu Shui Lin , Wu Zheng Yang , Qian Bin
Published: September 2013

This paper discusses an elevator monitoring system based on embedded system and the internet of things. Through multi-sensor information acquisition, much information can be accessed to such as vibration, acceleration, speed, running noise,direction,floor station,door switch of the elevator car and power supply voltage,current, temperature of the traction machine,at the same time the noise and the temperature of the computer room with the information if there is anyone in the elevator, etc.. WinCE operating system is ported to the master control chip S3C2410 of ARM9 architecture,and a WAN connection between the elevator parameter monitoring terminals and the remote control center is established to realize the centralized monitoring and automatic remote failure alarm for the elevator operation. This system provides technical support for elevator safety regulation and the practical running results is satisfactory.
Study on Development Trend of Intellectualization of Condition Monitoring for Port Logistics Machinery in Western China
Authors: Wang Yong , Wu Ya Shuang , Wang Lin Shuai
Published: September 2013

The Intellectualization of Condition Monitoring for Port Logistics machinery is an important part of port informatization. In this aspect, it is still at a low level in Chinas western port. This paper describes the intellectualized monitoring mode, technological development and evolution of the domestic and foreign ports. Then analyzes the status of the western port intellectualized monitoring, Researches its existing problems and studies its development trend.
Establishment of Flow Stress Model of EW75 Alloy
Authors: Ma Ming Long , Zhang Kui
Published: September 2013

The behavior evolvement of Mg-7.22Gd-4.84Y-1.26Nd-0.58Zr (EW75) magnesium alloy during the hot deformation process was discussed. The flow stress behavior of magnesium alloy over the strain rate range 0.002s-1to 2s-1and the temperature range 623K to 773K had been researched on Gleeble-1500D hot simulator under the maximum deformation degree 60%. A mathematical model was established to predict the stress-strain curves of this alloy during deformation. The experimental results showed that the stress-strain curves were obviously affected by the strain rates and deformation temperatures. The mathematical model could predict the stress-strain curves when the strain rates were under 0.2-1, but there was significant error in some of stress-strain curves when the strain-rate was 2-1by the reason of deformation temperature rising.
The Hardware Design of Ultrasonic Flaw Detector Based on Single-Chip Microcomputer AT89C52
Authors: Liu Wei , Miao Zhuo Lin , Cheng Huan Xin , Cheng Li
Published: September 2013

Ultrasonic nondestructive testing is an important detection method in nondestructive testing field. It is widely used in steel manufacturing, machinery manufacturing, electronics manufacturing, aerospace and defense and other fields and departments to ensure production quality and safety. In this paper, the main research work and research results are as follows: analyze the principle of electromagnetic ultrasonic nondestructive testing and characteristic and the hardware design of ultrasonic flaw detector system based on single-chip microcomputer AT89C52. This paper laid a good foundation for more in-depth studies in the research of ultrasonic digital signal processing in future.
EEMD-ApEn Applied in Power Quality Detection and Classification
Authors: Su Yu Xiang , Liu Guo Ping , Shen Xiao Qun
Published: September 2013

Ensemble Empirical Mode DecompositionApproximate Entropy (EEMD-ApEn) is proposed in this paper, which is mainly analyzed the transient pulse and transient oscillation. In order to overcome the modal mixing problems by empirical mode decomposition (EMD), ensemble EMD (EEMD) is used to obtain intrinsic mode functions (IMFs). Then effective IMFs with physical meaning are reconstructed. Finally, the approximate entropy of IMFs and original signal are calculated which are used to be the input feature vectors of the SVM classifier. The stimulant results show that EEMD-ApEn has better performance in detection and classification of transient pulse, transient oscillation, their noisy signal and the composite disturbance signals. The novel method has many advantages, such as simple, strong anti-noise, required fewer features and so on. Therefore the EEMD-ApEn is an effective method for power quality detection and feature vectors extraction.
Study on Signals Processing in State Detection of Tunnel Excavation Equipment's Cutter Head
Authors: Liang Jing Yi , Li Ping , Chen Lei
Published: September 2013

In the period of real time mechanical analysis and life style detection to the excavation tunnel equipment's cutter head, it is a necessity for the signals sensed by detection unit to be pretreatment processed. It closely concerns with the accuracy and validity of whole mechanical analysis results. By analyzing the features of all possible interference, this paper gives a study on signals initial processing applying method of digital filter and blind signal extraction. Simulation results show that the proposed scheme is effective enough to the mechanical analysis task.