bluuebunny/crossref_metadata_2025 huggingface dataset:
The Characteristics of Weld Metal Zone Welded with Various Filler Metals
Authors: Moon Kyung Man , Nam Mun Jin , Lee Yeon Chang , Kim Yun Hae , Jeong Jae Hyun
Published: May 2013

Recently, the fuel oil of diesel engines of marine ships is being changed to heavy oil of low quality as the oil price is getting higher and higher. Therefore, the wear and corrosion in all parts of the engine, such as cylinder liner, piston crown, and spindle and seat ring of exhaust valves has predominantly increased. Thus, the repair welding of the piston crown is a unique method to prolong its life in a economical point of view. In this case, filler metals with a high corrosion and wear resistance are mainly being used for repair welding. However, the piston crown on the ships job site is often actually being welded with mild filler metals. Therefore, in this study, mild filler metals, such as E4301, E431316, and E4316, were welded to the SS401 steel as the base metal, and the corrosion properties of their weld metals with and without post weld heat treatment were investigated with some electrochemical methods in 0.1% H2SO4 solution. The weld metal welded with E4301 filler metal exhibited the best corrosion resistance among the filler metals in the case of no heat treatment, however, its resistance was considerably decreased due to the post weld heat treatment (annealing:625°C, 2hr). In particular, the weld metal of E4316 exhibited relatively a good corrosion resistance by the post weld heat treatment.
Ab Initio Molecular Dynamics Simulations of Cu under Vacuum and 473~1573K
Authors: Sun Shu Hong , Chen Xiu Min , Zhang Feng Xia , Yang Bin
Published: May 2013

The structure and properties simulation of Cu under vacuum were studied by ab initio molecular dynamics simulation. The calculation results were characterized in terms of radial distribution function (RDF), coordination number (CN) and partial density of states (PDOS). The results show that the average distance between atoms increased with the temperature, while CN decreased, which indicated an obvious improvement of the thermal motion between atoms. The simulation datas showed that the liquid phase appeared in the system when the temperature arrived 1373K,which close to the melting point(1357K) of copper.
Design of Upswept Aft-Body of Civil Transport Based on CFD
Authors: Yang Mu Qing , Ma Dong Li , Liu Ya Feng , Li Wen Yue
Published: May 2013

Study on flow field of civil transport upswept aft-body is of much value as the drag coursed by aft-body contributes to about 10 percent of total drag. Currently researches were mostly concerned on clean fuselage, while little emphasis was put on fuse-tail configuration. With interests to exploiting the effect of design parameters on fuselage with empennage, computational fluid dynamics (CFD) was used to simulate the flow field of fuselages with different parameters. Based on studying the aerodynamic performance of clean fuselages, emphases were placed on fuse-tail configurations. Although fairing at root of stabilizer is good for reducing pressure drag, influence on friction drag should be taken into consideration when determine the design of fairing. With stabilizer mounted, drag of axial symmetric fuselage is not the minimum, while the one with some angle upswept is drag optimal.
Discrete Element Method Simulation of Mesomechanics of Railway Ballast during Tamping Process
Authors: Zhou Tao Yong , Hu Bin , Yan Bo , Xu Ping
Published: May 2013

Railway ballast tamping operations is employed in order to restore the geometry of railway track distorted by train traffics. The selection of tamping parameter is usually dependent on field trials and practical experience, for lack of theoretical basis. This paper creates discrete element analysis model of railway ballast using the discrete element method, the numerical simulations are carried out to study the mesomechanics of railway ballast during tamping process. We focus on the change of railway ballast compactness and stone ballast interaction force during tamping process. The present study can be helpful for the analysis of the internal mechanism of ballast compaction during tamping process.
Combination Regression and Neural Network for Short Term Load Forecasting
Authors: Chen Qing Ming , Xu Xiao Zhong , Zeng Nan
Published: May 2013

The forecasting of gas demand has become one of the major research fields in gas engineering. Gas demand possesses dual property of increasement and seasonal fluctuation simultaneously, so it makes gas demand variation possess complex nonlinear combined character. Accurately forecast were essential part of an efficient gas system planning and operation. In this paper, a new forecasting model which named regression combined neural network is put forward. In this approach we used regression to model the trend and used neural network for calculating predicted values and errors. Taking the advantages of regression analysis and artificial neural network, the model improves the forecasting accuracy of power demand obviously. The results indicate that the model is effective and feasible for load forecasting.
Point Cloud Data Preprocessing Based on the Geomagic
Authors: Xue Feng Chang
Published: May 2013

In the acquisition process of point cloud data, there exist speckles and noise point. This essay, based on geomagic, presents specific technical steps to remove isolated point in vitro, avoid point cloud resampling and remove point cloud noise. Applications showed that geomagic can, from the original point cloud process, find out useful point cloud, delete speckles, and through the methods of resampling and noise reduction processing, improve cloud quality and reduce data deviation thus improving the data processing efficiency.
The Micro-Variation Principle of Mating Constraints and its Application to Simulation of Cumulative Deviations for Mechanical Assemblies
Authors: Wang Bo , Xu Jing Lin , Zheng Guo Lei , Duan Li Hua
Published: May 2013

Simulation of a product’s cumulative deviations on its three dimensional model reflects the influence of machining errors on the product’s assembly precision effectively. However, there was little research involved on that. This paper presented an algorithm oriented to the three dimensional models of mechanical assemblies to simulate the accumulation of manufacturing deviations. Firstly, the basic theory was studied, and the principle of micro-variation of the assembly constraints was presented, based on which a solution method was given. Secondly, mating constraints defined in current CAD systems were classified, and the equivalent conversions between different type of cons- traints were set up. After that, the influence of machining error on the mating constraints was ana- lyzed, and a simulation algorithm of variation accumulation was constructed. Finally, an example was given to illustrate the validity and effectiveness of the approach.
The Study of Mechanism Analysis and Dynamical Simulation Based on Ultrasound Enhanced Supercritical and Subcritical CO2 Dissolution
Authors: Zhang Bin , Liu Wei Wei , Li Ming Zheng , Zhang Hong Chao
Published: May 2013

The supercritical and subcritical CO2 fluids are both new technologies having good industrial applications such as cleaning with the advantages of no residue, recyclability and so on. The technology of ultrasound coupled with them can enhance the dissolution and improve the mass transfer. However, there is a lack of in-depth study of its mechanism. The reasonable mechanism analysis of enhancement is stated in this paper. A new model is proposed that can simulate the dynamics of cavitation bubbles in the subcritical CO2 fluid based on the Rayleigh-Plesset equation. The effects of different parameter conditions on the dynamics of cavitation bubbles have been discussed and ideal parameter conditions which are beneficial to the dissolution are also listed from the dynamical simulation results.
Design of Compressed Air Dehumidifying Equipment for Wire Rope and Simulation of Air Knife Flow Field
Authors: Guo Peng Hui , Cui Wei Hua , Wang Hui
Published: May 2013

Aiming at characteristics of wire rope for stringing, this text designed mechanical structure of compressed air dehumidifying device, in order to study the influence of relative angle between air knife and wire rope, jet distance and inlet pressure of air knife on blowing pressure, it designed orthogonal experiment, using Fluent to simulate flow field of air knife, then obtain the flow characteristic parameters. After analyzing simulation results, the article draws a conclusion of influence of every factor on blowing pressure and the optimal level combination, providing a basis for practical dehumidifying work.
Partial Least Squares Regression Analysis of Thermal Distortion Behavior for Linear Motor Drive Feed System
Authors: Lin Xian Kun , Wu Qian Qian
Published: May 2013

In order to explore the effect factors of thermal distortion behavior of the high speed feeding system, a methodology with partial least squares linear regression (PLSR) was brought forward to analyze the thermal process on the basis of experiments. The feeding system test-bed and the thermal behavior measurement system were established for the experiments. The experiments were conducted under both the natural heating and force cooling condition to show the feasibility of the method. The experimental scheme and procedure were also introduced in detail. On the basis of the experiments and the regression calculation, the distribution characteristics of temperature for the high speed feeding drive system and the rule of the thermal distortion behavior were explored with further discussion. The results show that the proposed method can effectively recognize the experimental data and reach high distortion identification accuracy. The resultant factors and their proportions of thermal deformation were presented through regression calculation. The prediction of the distortion at some random axis positions was done with the regression model. The result shows good performance for recognition of the axis deformation. As a result, the study effort provides a theoretical foundation for optimum design and error compensation in machining process.
The Simulation Study of the Influence of Surface Error on Optical Properties for Optical Part
Authors: Liu Tao Ran , Qiu Xing , Li He , Li Yan Li , Xu Chao , Hu Yong , Zhou Xiao Qin
Published: May 2013

In order to study the influence of surface error on optical properties for optical part after machining, this paper takes a piece of ring curved lens with aperture D=2mm as an example. When analyzing the influence of surface error on optical properties, it employs the evaluation indexes i.e. wavefront aberration, point spread function and modulation transfer function. The study results show that with the increment of surface error, the value of wavefront aberration increases. Plus, the light of outer loop on the image plane is more obvious and its energy increases, however, the energy in the center range decreases. Moreover, the capacity of information storage decreases and also the image quality decreases.
Co-Simulation of Composite ABS Control for In-Wheel Motor Drive Electric Vehicle Based on Threshold Control Algorithm
Authors: Li Jian Hua , Song Chuan Xue , Jin Li Qiang
Published: May 2013

According to the brake characteristics of in-wheel motor drive electric vehicles, and basing on threshold control method, we describe one kind of composite ABS control theory about electric motor ABS combined with hydraulic friction ABS, and establish a co-simulation vehicle model. The composite ABS control method is a control method that the electric motor ABS control works together with the hydraulic ABS control. Both of the two modes of ABS control logic were using logic threshold control method. The model of the in-wheel motor drive electric vehicle was established with AMESim, and the model of the composite ABS controller was built with Simulink. The control performance of composite ABS in different braking strength and different road friction coefficients is simulated. Co-simulation was carried out. Through analysis, a number of parameters curves were obtained. It proves that the composite ABS control method for in-wheel motor drive electric vehicles can effectively control the slip rate, and ensure braking stability.
Research on Vibration and Sound Radiation from Submarine Functionally Graded Material Nonpressure Cylindrical Shell
Authors: Zhang Yan Bing , Ren Chun Yu , Zhu Xi
Published: May 2013

In this paper, we establish the finite element (FEM) and boundary element (BEM) models of a submarine section, and study the underwater sound radiation field of three different non-pressure shells made of steel, steel with anechoic tile, and the functionally graded materials (FGM) separately using a method combining of FEM and BEM . Research shows that the combination of FEM and BEM can address the acoustic radiation calculation problem of FGM, and in comparison with steel and anechoic tile laying submarine section, the weight of FGM non-pressure shell reduces 1600kg, and the sound radiation power decreases 4db and 2.5db respectively, thus having better performance in vibration and noise reduction.
Analysis and Research on the Microstructure Fractal Characteristics of the Copper Matrix Composites
Authors: Ma Run Bo , Xu Shi Meng , Du Jian Hua
Published: May 2013

Through the analysis and research on images of microstructure of the copper matrix composites, we calculated the fractal dimension of images of microstructure on cross section and parallel pressed power side under different experimental conditions. Meanwhile analyzed some statistics characteristics of fractal dimension. The results show that fractal dimension of graphite reflects the distribution, the dimension is more larger, the organization chart is more complex, the distribution of graphite is more irregular, so the irregular distribution of free graphite can be described by fractal dimension, fractal dimension can be used as a material characterization parameters of organizational form. Through analyses we can get that the fractal dimension of the materials on cross section and parallel pressed power side combining to normal distribution, and it changed with graphite content doesnt affect each other.
Numerical Simulation for Rock Fracturing Process under Action of Disc Cutter
Authors: Cao Li Juan , Li Shou Ju , Shang Guan Zi Chang
Published: May 2013

Three-dimensional dynamic fracture process of rock under action of disc cutter is simulated by using nonlinear finite element method. Rock constitutive relationship is characterized by Drucker-Prager model. The influences of disc angular velocity and vertical force on the penetration depth and the specific energy are systematically investigated. The simulation results show that the rock fracturing process obviously presents properties of step crushing under action of disc cutter. The proposed numerical simulation presents an improvement on existing ones in terms of providing three-dimensional visual description of rock fracturing process.
The Optimization of CO2 Huff and Puff Well Location in Ultra-Low Permeability Reservoir
Authors: Zhao Dong Feng , Liao Xin Wei , Wang Shao Ping , Yin Dan Dan , Shang Bao Bing
Published: May 2013

The oil recovery of CO2huff and puff well in ultra-low permeability reservoir is low. It is necessary to take measures to increase the development benefit. So the relevant development examples and theoretical research are taken into account in this paper, and according to liquid property and reservoir characteristics, the screening and evaluating system and grading evaluation standard of CO2 huff and puff well location is established. Based on fuzzy comprehensive evaluation, screening steps of CO2 huff and puff well location in ultra-low permeability reservoir is also established. The effect of the method has been proved by field practice. The result provides theoretical and technological support. And it provides reference for similar reservoirs.
Dynamic Analysis of the Rotating Composite Thin-Walled Cantilever Beams with Shear Deformation
Authors: Ren Yong Sheng , Dai Qi Yi
Published: May 2013

This paper presents a theoretical study of the dynamic characteristics of rotating composite cantilever beams. Considering shear deformation and cross section warping, the equations of motion of the rotating cantilever beams are derived using Hamilton’s principle. The Galerkin’s method is used in order to analysis the free vibration behaviors of the model. Comparison of the theoretical solutions has been made with the results obtained from the finite element method, which prove the validity of the model presented in this paper. Natural frequencies are obtained for circular tubular composite beams. The effects of fiber orientation, rotating speed and structure parameters on modal frequencies are investigated.
Distribution of Stray Current in the Buried Metallic Pipeline Based on Inducted Electric Field
Authors: Li Chun Huan , Zhang Sheng Tao , Li Wen Po
Published: May 2013

Stray current flows through the buried metallic pipeline which exposed to electrochemical corrosion attack. The distribution of stray current is studied by Finite Element Method analysis model, the results indicate that stray current increase gradually along the buried metallic pipeline, reaching to a maximum value in an intermediary point, and then decreases gradually, has a regular bilateral symmetry. The distribution model of stray current is discussed by the inducted electric field theory.
Simulation Analysis on Height Change of 6010 Aluminum Plate Limit Drawing under Different Process Parameters
Authors: Li Jian Ping
Published: May 2013

Drawing cylindrical forgings of 6010 aluminum plate as an example, by using software Dynaform to proceed finite element simulation of forming, research the influence of factors such as pressure machine speed, friction coefficient and fillet radius on limit drawing height. Get best effect when pressure machine speed in 8000 ~ 14000 mm/SEC, the friction coefficient take about 0.2 and fillet radius for 13 mm. It provides theoretical basis for design the size of battery shell and bullet shell and select the suitable process parameters according to highly size of drawing parts
Virtual Processing of Fish Fillets
Authors: Fok Sai Cheong , Tan Fock Lai
Published: May 2013

This paper presents the application of digital simulation to explore the processing of fish fillets of different geometries in an air blast freezer. The main advantage of this virtual processing approach is that it allows for the comparison of the freezing times, production rates, energy consumptions and the costs of freezing fillets of different shapes and sizes. These parameters could be critical for production planning and are discussed in the paper.
The Study of EDG GH3536 Surface Roughness Base on the Artificial Neural Network Modeling
Authors: Gao Ji , Wang Di , Sun Yao
Published: May 2013

The process parameters of electrical discharge grinding,such as workpiece polarity, pulse width, pulse interval, peak current, peak voltage, all have influence on GH3536’s surface roughness.General method is difficult to determine the relationship between the process parameters and the process indicators. This article established a artificial neural network model of EDG GH3536 surface roughness which can forecast. Neural network algorithm use BP algorithm, the network structure is the 2-4-1.
Reservoir Modeling and Numerical Simulation Controlled by Flow Units
Authors: Xue Yong Chao , Cheng Lin Song
Published: May 2013

Geological model controlled by sedimentary microfacies can not able to accurately reflect the actual seepage characteristic, How to apply the static flow units to the dynamic reservoir numerical simulation is the advancing edge of petroleum industry. The method of reservoir geological modeling controlled by flow units is proposed. Firstly, the 3D models of flow unit should be build, secondly, the 3D porosity and permeability model are established controlled by the model of flow unit, thirdly, the 3D fluids saturation model is calculated by Leverett J function based on porosity and permeability mode. Selecting different relative permeability curves according to different flow units in history matching. which realizes the dynamic (development geological) and static (reservoir engineering) combination. The oilfield examples shown that the velocity and precision of history matching can be significantly improved by using the method mentioned.
Flow units were proposed by Hearn in 1984[. Study on flow units, which could not only deepen the understanding of reservoir geology, make reservoir evaluation more reasonable and reduce the heterogeneity impact on oil development, but also could be of great significance to improve oil field development effect especially for tertiary oil recovery[. Previous studies mainly focused on defining the concept of flow units, divide method of flow units and so on, but few studies on how to apply the study results of static flow units to the dynamic reservoir engineering and reservoir simulation[3-. Our research aimed at how to connect the static flow units and the dynamic reservoir simulation closely so as to achieve "dynamic and static combination".
Quantitative Analysis of Lateral Setting Error in Two-Point Method
Authors: Ding Guo Qing , Chen Xin , Wang Hong , Lei Li Hua , Li Yuan
Published: May 2013

In a multiple probes scanning system for a high precision straightness measurement, the lateral setting error between probes is ignored generally due to the average effect in the range of the aperture of the probes. In this paper, we study a two displacement sensors scanning system. Firstly, the principle of two-point method which is based on the natural extension method is introduced. Then, the influence of the lateral setting error between two probes is analyzed quantificationally when the discrete Fourier transform algorithm is applied. It is shown that a relative evaluation error within the range of 1% can be obtained if the lateral setting error is smaller than 1.5% of the sampling interval as long as the spatial wavelength of the evaluated profile is longer than the probe interval. The effectiveness of the results of the quantitative analysis is confirmed by computer simulations.
Virtual Gear Measurement Center and its Application
Authors: Chen Hong , Wang Fang
Published: May 2013

In view of the complexity of the gear measurement center and its error calibration, the paper put forward the basic concept of a virtual gear measurement center, and analyzed the compositon of the virtual system. The virtual gear measurement center can be used to simulate the real gear measurement process and quantitatively analysis the effects of error, so as to calculate the measurement uncertainty. The application of the virtual gear measurement center was discussed.
Experimental Investigation on Thermal Characteristics of Hollow Ball Screw in Different Working Conditions
Authors: Wang Yu , Gao Wei Guo , Zhang Da Wei , Sun Zhen Hong
Published: May 2013

The text takes Z-Axis of precision machine tool as study object, and proceed the thermal character's experiment of Z-Axis feed system in different working condition (different Cooling strategy, different Feeding speed, load or not). The data of experiment shows the higher of the feed speed, the more heat is generated. Position accuracy can be increase by apply the right load and load is nearly none business with temperature rise. Cooling strategy is nearly none business with temperature rise and may cause the discretization of position accuracy.
Inflection Points Processing of Continuous Tiny Line Segments for CNC System High-Speed Machining
Authors: Wu Kai Fa , Wang Tai Yong , Liu Qing Jian , Lin Fu Xun , Liang Ruo Yu
Published: May 2013

Overcut or speed impact exists in high-speed interpolation of consecutive tiny segments. Because the remaining distance of the current segment does not exactly equal to an interpolation cycle required distance. Taking processing accuracy as a precondition, a new inflection point processing method is proposed to solve this problem. With different solutions of different angles, this method realizes the tiny line continuous processing with high processing quality. And this method needs a small amount of calculation with strong real-time. Error analysis is done and it can meet machining accuracy requirements. Now this method has been applied to engineering practice.
Research on the Influence of Harmonics on High-Speed Permanent Magnet Motor
Authors: Cui Hong , Gao You Qing
Published: May 2013

The influence of current harmonics on high-speed permanent magnet motor is analyzed in this paper. The several aspects influence of current harmonics are analyzed in detail such as on the stator core losses, copper losses, as well as additional losses, the rotor losses, the electromagnetic torque etc. The necessity of suppressing current harmonics for high-speed motor stable and reliable running and the key issues of high-speed motor control system stable operation is stated.
Study on Spindle Dynamic Errors of Domestic NC Machine Tools
Authors: Qiu Jian
Published: May 2013

This paper explains a set of tests necessary for ensuring spindle performance focus on the rotating sensitive direction of spindle. It is found that the original signals of spindle dynamic rotation could be separated and reconstructed to spindle dynamic signal and random signal according to their different frequency components. The asynchronous error and synchronization error of spindle dynamic rotation in radial direction and axial direction could be computed from spindle dynamic signal. The distribution trend of spindle dynamic errors is studied, it is found without considering the shift speed of machine tool spindle and the natural frequency of machine tool, the distribution of spindle dynamic errors presented a trend of rising with the rotation speed increasing.
Microstructure and Properties of Deformation-Processed Cu–Cr In Situ Composites
Authors: Liu Ke Ming , Chen Z.B. , Zou Jin , Wei Shi Yong , Hu Qiang , Lu De Ping
Published: May 2013

Cu-11Cr alloy was prepared by casting and processed into an in situ composite by cold deformation and heat treatment. The microstructure, strength and conductivity were investigated by scanning electronic microscope, tensile-testing machine and micro-ohmmeter. The results suggested that the initially randomly distributed Cr dendrites in the as-cast Cu-11Cr alloy were transformed into Cr fibres aligned parallel to the drawing axis in the deformation-processed in situ composite; the tensile strength and the resistivity increased with increasing cold deformation strain. The good combination of strength and conductivity of the deformation-processed Cu-11Cr in situ composite was achieved by using the proper cold deformation and heat treatment. At η = 8, the tensile strength and conductivity reached 823 MPa and 71.9 %IACS, respectively.
Study on Flaw Detection in Welding Zone of Diamond Saw Blade
Authors: Zhao Min , Gai Rui Bo , Zhang Jing
Published: May 2013

In this paper X-ray and penetrant inspection were applied to detect flaws in welding zone between diamond segment and matrix in order to detect position and form of the flaw. The result can be used to assess weld quality and performance of diamond saw blade. The result shows that main flaws on welding zone are crack, incomplete fusion, lack of fusion, pore. These flaws can affect the life and machining precision of the diamond saw blade. We can improve the welding process to ensure welding quality and reliability of saw blade by detected flaws.
Study on Reaming High-Precision Thin Hole in Hardened Steel by Ultrasonic Vibration Reamer
Authors: Zhang Jian Zhong , Zhang Nian Cheng , Zhang Yue
Published: May 2013

It has been one of the difficulties that high-precision thin hole is machined. The supersonic vibration reaming acoustic system is installed in the lathe. The supersonic wave energy applies to reamer to create pulse power on the cutting process. The separating vibration cutting is achieved to make the pulse force. The tests on reaming surface quality and precision are carried. The quality of surface and accuracy machined by this method is more than that by grinding. The reaming process is stability. The cutting force is greatly reduced. The cutting temperature is at room temperature. The tool life is greatly increased. Surface quality and shape precision is greatly improved. The regulations of the ultrasonic vibration reaming thin hole in hardened steel are also summarized. The test results show that the ultrasonic vibration reaming by reamer is of very superior cutting mechanism. It is efficient cutting methods for high-precision thin-hole machining of hardened materials.
Development of an Automatic Inspection System for Manufacture of Plastic-Container Pump Assemblies
Authors: Hwang Sang Wook , Kim Jeong Min , Kim Jong Yeop , Jun Jin Mo , Hong Dea Sun
Published: May 2013

As the final process in manufacturing of plastic-container pump assemblies, a kind of personal care goods, in a company, the exterior of the products is currently inspected by manual work. In this processes, defections such as existence of oil stain, discoloration and incomplete forming or assembling are examined. The product quality from such manual process is mainly dependent on the experience of workers, thus consistent quality between products is not guaranteed. To cope with such problem, this study develops an automation system for the exterior inspection of the product, and the performance of the system manufactured is evaluated through a series of operation experiments. Also, the system is modified twice through statistical analysis to enhance its performance.
Study on High-Speed Milling Force of SiCp/Al Matrix Composite
Authors: Xin Long , Lv Jun Juan
Published: May 2013

On the condition of some milling depth and feed rate, By means of high-speed milling force measurement of SiCp/Al matrix composite, the rule for impact of milling speed on milling force is revealed successfully. In some range of milling speed, when SiCp/Al is high-speed milled, the milling force is lowered with increase of milling speed. Furthermore, the experiment also show that the optimal milling speed should be adjusted between 200 and 260 m/min for the SiCp/Al matrix composite with 56% volume fraction and particle size of 60μm.
Characteristics of Marks on Concave Key Duplicated by Machine
Authors: Jin Yi
Published: May 2013

In this paper, the marks on the concave keys used as guide keys duplicated by machine which has the function of profile modeling was analyzed systematically by experiments. In the experiment, the research concentrated on following aspect, the distinguish between mark on the concave key duplicated by machine with the producing mark and the using mark, the regularities of distribution and emergence probability of the characteristic marks on the key duplicated. The experimental research indicates that there are distinctive marks on the keys when normally used and when used as guide keys. The marks formed on the region that profile modeling needle touches in the process of duplicating have distinguishing characteristic. Therefore, the method is put forward that the examination of concave key can reveal distinctive marks whether the key has been used as a guide to create another key, it will be very useful to estimate criminality and analyze criminal scene.
Deficiency Analysis of Different Ship Types Based on Taiwan PSC Data
Authors: Chen Jing , Jin Yong Xing , Chen Jian Ming , Yuan Jian Zhong
Published: May 2013

The work Port State Control (PSC) lets ships more and more comply with the relevant international conventions by checking and mandatory correction or detention. In this paper, based on the PSC data of Taiwan ports in the past nine years, mathematical statistics method is put forward to analysis the association between ship type and deficiency, which could provide PSC officers with constructive recommendations.
The Development of Santana 2000 Lighting Test Rig
Authors: Liu Yan
Published: May 2013

Santana 2000 car is the study of the automotive lighting test rig. In the development process, all parts are arranged in accordance with the original car position, and the original car lighting harness was wiring, and fault box of the simulation of the actual fault was set. Developed automotive lighting test rig can really provide lighting and signal system control principle and process. The whole system or local circuit wiring training and line detection training can be done. Actual troubleshooting ability can be trained by the whole system or local circuit. It is multi-function, much cheaper and has better effect. And it provides real platform for improving the operating ability of the lighting and signal system.
Sintering Characters Analysis of the Al2O3-86 Homogenized Bauxite
Authors: Yang Huan Ying , Li Yong , Liu Shu Long , Gao Chang He , Ma Shu Long , Wang Lin Jun
Published: May 2013

The present explains sintering characters of the Al2O3-86 homogenized bauxite under wet processes homogenization, which includes classified bauxite mine, wet grinding, vacuum extrusion, sintering in tunnel kiln,etc. DSC and TG reveal an evident peak of absorption heat at 531°C, resulting from the dehydroxylation of bauxite. Green samples held at 550°C*6hrs were heated up to different temperatures, and the properties of weight loss, linear change, bulk density and apparent porosity were measured. The data show that liquid-phase emerge and sintering process goes slowly above 1100°C. At 1500°C, large amounts of liquid-phase form, making liquid-phase sintering have a positive effect. The analysis of XRD and SEM indicate that, corundum grains develop more inadequate and most of the corundums interlace in a compact way, which can separate the widespread liquid phase and improve the sintering capability of homogenized bauxite.
Preliminary Study on Leaching Mechanism of Manganese Using Ternary Compound Reductant
Authors: Liu Wei , Song Chuang Chen , Sun Min , Zong Fu Zhe , Zhang Yan , Song Jian Guo
Published: May 2013

In this paper, the study of leaching mechanism from low-grade manganese ores by using ternary complex reductant of hydrogen peroxide, glucose and cellulose was discussed. Quantitative and qualitative analysis were conducted about original manganese and manganese slag by XRD and FTIR. XRD quantitative analysis showed that manganese content in manganese ore is about 11%; The FTIR spectra qualitatively analyzed that part broken of the C=C bond in the manganese samples leads to divalent manganese be released.
Late Accumulation of Kunbei Area in Qaidam Basin
Authors: Shi Hui , Li Hui
Published: May 2013

This paper is aimed to find out the main reason of late accumulation of Kunbei area in Qaidam Basin using geochemistry and seismic data and to provide scientific evidence to the potential petroleum exploration in this area. Reservoirs in Kunbei fault terrace zone originate from petreoleum generated by source rocks of E32 in Zhahaquan depression after N23(about 5.2Ma), which means a charcteristic of hysteretic hydrocarbon generation. Brine inclusions shows two hydrocarbon charging periods.The first charging most likely happens at N1 and the second begins at N21,continuing to Q.Two deformaton stages exist in the study area due to the Tibet Plateau uplifting. The accumulations of first stage have been damaged after Middle N1. The reservoirs of Kunbei zone at present are almost orignated from E32 in depression. Above all,the primary cause of late accumulation is due to long-distance effects of the Tibet Plateau uplifting.
The Influence of AC Perturbations on EIS Measurement of Copper/LDPE Composite with High Resistance
Authors: Wang Yun , Hu Xiao Xi
Published: May 2013

Copper/LDPE composites are novel materials for intrauterine devices and they are the dispersion-type composites with high resistances. When the electrochemical impedance spectroscopy was used to evaluate the properties of materials with high resistances, in order to reduce the fluctuations in the measured data, the AC perturbation should be optimized. In this paper, the effects of the AC perturbations on the electrochemical impedance spectroscopy of copper/LDPE were discussed and the optimal AC perturbation was confirmed. The results have shown that the optimal perturbation of the electrochemical impedance spectroscopy of copper/LDPE composite, in the earlier period was 50mV, after achieving the saturation point the perturbation would change to 5mV.
The Sorting Method of the same Pattern Compound Material Based on Basic Element Model of Surface Microstructure
Authors: Xu Shi Meng , Ma Run Bo , Du Jian Hua , Liu Jun Hong , Jin Qi
Published: May 2013

Based on the elliptic element model, the new sorting method on the same pattern compound materials was given in this paper according to the pictures obtained by electronic microscopy systems on the surfaces. Here, the block design combined with variance analysis was introduced to sort the compound materials that contained that the copper-base mingled with graphite, silica and other non-pronounced components. Here, the five kinds of the same pattern compound materials were proposed for sorting, only the graphite distribution was considered and their mixture ratios of components were separately 10%, 15%, 20%, 25%, 30%. At last, through experiment data and statistical analysis, the result of sorting was basically corresponding to the above mixture ratios of components.
Innovative Utilization of a Borate Additive in Magnesium Production to Decrease Environmental Impact of Fluorides from Pidgeon Process
Authors: Han Feng Lan , Yang Qi Xing , Wu Lan Er , Du Chun
Published: May 2013

The present authors have utilized, for the first time, H3BO3as an additive in pilot scale experiments of Mg production using Pidgeon process. The results from the experiments revealed positive effects of H3BO3on both quantity and quality of the Mg metal crowns. Besides acting as a catalyzer for MgO reduction, H3BO3stabilized also β-Ca2SiO4in the Mg slag. Based on these results, H3BO3may be adopted as an innovative additive replacing fluorite in the Mg production, to enhance sustainability and environmental soundness for the Pidgeon process in China.
Microstructure and Formation Mechanism of Two-Liquid Bimetal Composite Interface
Authors: Zhu Yong Chang , Rong Shou Fan , Yang Han Song , Wei Zun Jie , Han Miao Miao
Published: May 2013

Two-liquid bimetal composite casting technology by double induction furnace fusion was utilized for preparing bimetal product in tradition. Single induction furnace fusion has been investigated between the high carbon steel and the low carbon steel, and varying casting thickness has an obvious effect on the bimetal bonding layer. The results have shown that the bimetal bonding layer can not been generated under over thinness or thickness. In the condition of the thicker low carbon steel, two kinds of metal liquid were easy to rush mixture without the distinct interface, whereas the thinner low carbon steel can also effectively form metallurgical bonding. While the low carbon steel owned the proper thickness, metallurgical bonding can been observed distinctly, confirming the feasibility of the single induction fusion for preparing the bimetal.
Adsorption of Congo Red from Aqueous Solution onto Chitosan/Rectorite Composite
Authors: Feng Tao , Xu Lei
Published: May 2013

The chitosan/rectorite composite was prepared and characterized by XRD. The interlayer distance of rectorite was enlarged from 2.53 nm to 3.01 nm. Congo red (CR) was selected as a model anionic dye and the adsorption tests of CR onto chitosan/rectorite composite were carried out. The results showed that the CR adsorption process is dependent on pH and initial CR concentration and temperature. The maximal CR uptake by chitosan/rectorite composite was 73.8 mg g-1 in the test. Adsorption kinetics studies indicated that the sorption processes were better fitted by pseudo-second order equation.
Preparation of Nanosized Barium Titanate Powder by a Direct Reactive Precipitation Method
Authors: Li Hong Bo , Wu Shu Yan , Wang Jing , Li Chun Jie
Published: May 2013

Columnar crystaldendriteequiaxial dendritescolumnar crystalNanosized powder was synthesized by direct-reactive precipitation process using a stoichiometrical mixture of TiCl4, BaCl2 as the reactants while NaOH as precipitant. Under the ratio of Ba to Ti is 1.02, PH=13, three reaction temperature of 70°C, 80°C and 90°C were conducted respectively. Morphology and phase structure of powder were investigated, and the influence of reaction temperature on powder morphology was discussed. The result indicates that synthesized powder is single cubic BaTiO3 and contains no impurities. BaTiO3 powders generally show spherical, and average particle size decreases with increasing reaction temperature. When reaction temperature is 80°C, BaTiO3 powder has best uniformity and dispersivity with the diameter of 80-100nm. The influence of reaction temperature on powder particle size can be attributed to the corporate contribution of nucleation and growth rate. Polyglycol as surface active agent has a significant effect in restraining agglomeration.
The Development of Nanocrystalline Materials Prepared by Electrodeposition
Authors: Sun Miao , Zhang Ning , Kan Hong Min , Wang Xiao Yang , Yang Fei Yi , Fu Ting Ting
Published: May 2013

The characteristics and the synthesis principle of nanocrystalline materials prepared by electrodeposition are summaried in this paper. The research status of nanocrystalline materials and the common methods preparing nanocrystalline materials are reviewed, such as direct current electrodeposition, pulse electrodeposition, composite electrodeposition and jet electrodeposition. Finally, some prospects on development and applications of nanocrystalline materials in material science are proposed in this paper.
The Research of Influence on Fe-N Alloy Magnetism from Experiment Parameters
Authors: Guo Xiu Zhi , Chen Ruo Hui , Song Wen Fu
Published: May 2013

Fe-N amorphous alloy and ε- FexN alloy were prepared by mechanical ball milling with Fe and solid hexagonal boron nitride (h-BN) as nitrogen resource. The microstructural and magnetic transforming rules of different volume ratios of mixtures of Fe and h-BN (1:12.5, 1:5.4, 1:1.2, and 1:0.38) was studied under different ball-to-powder weight ratios. phase transition and magnetism were characterized with X-ray diffraction and vibrating sample magnetometer (VSM). According to the results, samples of the first three volume ratios have similar phase transition rules in different ball-to-powder weight ratios, and the sample with smaller ball-to-powder weight ratio costs more time in alloy formation. The changing rules and mechanisms of coercivity of four ratio samples with the extension of ball milling time has been clarified.
Preparation of Expanded Graphite with Fe3O4 Nanoparticles
Authors: Wang Chun Yu , Ma Mei , Qin Chun Lin , Wen Guang Wu
Published: May 2013

In this paper, it can be seen that the optimum mixture ratio of graphite to other contents (graphite: H2SO4: H2O2: HClO4) is 10(g):28(ml):1(ml):5(ml), which obtained the best expansion voluSubscript textme (191ml/g). The Fe3O4-expanded graphite composite material was prepared by FeCl3solution of ethylene glycol with heating reaction in reactor. The graphite sheets within EG were nanoscales, four iron oxide nanoparticles were dispersed between holes of expanded graphite sheets. Evidently, the graphite nanosheets wrapped in the four iron oxide particles can be observed. It is clearly that the magnetic adsorption properties of particles are strength on EG/Fe3O4. In addition, the EG/Fe3O4composite obtained by this process has a product (magnetite), which is proved of XRD characteristic peaks.
Study on Catalytic Efficiency of Ag⁄N Co–Doped TiO2 Nanotube Arrays under Visible Light Irradiation
Authors: Kang Xi , Qi Jing , Ye Long , You Hong , Hu Li Jiang
Published: May 2013

Ag⁄N co–doped TiO2 nanotube arrays (TNTs) were prepared by anodic oxidation, a certain amount of Ag deposited on the surface of TNTs by photodeposition and annealing post-treatment. The doped TNTs were characterized by field-emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis diffusion reflection spectroscopy (UV–vis DRS). The photocatalytic activities of the prepared TiO2 were evaluated by degrading rhodamine B (RhB) under visible light irradiation (≤ 420 nm). The photocatalytic degradation efficiency of the Ag/N-TNTs obtained for the degradation of RhB are 0.32 times, 0.6 times and 1.86 times higher than that of TNTs, N–TNTs, AgTNTs, respectively.
Aligned Nanofiber Arrays and Twisted Nanofiber Ropes via Electrospinning with Two Frames Collector
Authors: Zheng Jie , Long Yun Ze , Sun Bin , Zhang Hong Di , Zhang Jun Cheng , Huang Jia Yin
Published: May 2013

A modified electrospinning setup with two-grounded-frame collector is proposed to fabricate aligned fiber arrays and fiber ropes. In this setup, two frames are placed under the spinneret, with the outer frame rotated with an electromotor and the inner frame hold still in a horizontal direction. Aligned nanofiber arrays can be collected rapidly on the inner frame. Influence of included angle and motor rotating speed on the arrays is discussed. In addition, through rotating one side of the inner frame, twisted fiber ropes with diameter 30~40 μm and length of 12 cm are obtained. Mechanical properties of the individual nanofiber ropes are also measured and discussed.
An Integrated Evaluation Model for New Product Development in Light-Emitting Diode Plant Lighting Industry
Authors: Chen Wen Chin , Wang Li Yi , Chang Hui Pin
Published: May 2013

This study would create a decision making model for new product development (NPD) in light-emitting diode (LED) plant lighting industry. At first literature reviews and expert interviews will be employed to list five perspectives and 19 criteria thereof. A fuzzy Delphi method (FDM) will be then used to screen factors for the criteria. An interpretive structural model (ISM) will be managed to get the relationships among the perspectives and among the criteria. A fuzzy analytic network process (FANP) will be finally manipulated to compute the weights of all criteria. Results of the study will provide an assessment model of NPD decision making for LED plant lighting industry.
The Effect of Heat Treatment on Microstructure and Performance of Die Forging Copper
Authors: Yang Gui Rong , Song Wen Ming , Ma Ying , Hao Yuan
Published: May 2013

The copper specimen was fabricated through liquid die forging under optimum technical parameter, and the die forging copper was annealed under different conditions. The effect of annealing treatment on the microstructure, strength, hardness and electric conductivity of die forging copper was investigated. The results show that the microstructure of die forging copper was changed into equiaxed grain when the treating temperature was less than 250 °C and treating time was less than 2.0 h. The restoration and recrystallization happened during treatment and the obtained crystal grain size became smaller. The strength of die forging copper decreased after annealing treatment owing to the decreasing of dislocation density and concentration of supersaturated vacancy. The hardness of die forging copper also dropped to some extent. The electric conductivity of die forging copper was increased by 5.2% after annealing treatment because the concentration of supersaturated vacancy and dislocation density was decreased obviously.