bluuebunny/crossref_metadata_2025 huggingface dataset:
Photocatalytic Activity of Gd3+ and Sm3+ Co-Doped BiVO4 Powders Prepared by Chemical Precipitation Process
Authors: Jiang Cheng Zhi , Yang Rui , Bai Sen , Lu Xu Dong
Published: June 2012

Pure BiVO4, single doped and co-doped BiVO4 have been prepared by chemical precipitation method and characterized by the techniques such as XRD and SEM/EDAX. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate pure BiVO4, single doped BiVO4 and co-doped BiVO4 photocatalytic activity. The results show that doping of single doped and co-doped significantly enhance the photocatalytic activity of BiVO4. When the 0.1%Gd3+ and 0.2%Sm co-doped, the BiVO4 degradation rate reaches 91%.
Uncertainty Evaluation in Measure Results of Rock Permeability
Authors: Chen Yan
Published: June 2012

This paper introduced the measure methods model and principles of Permeability in the ECK-; the uncertainty source for the measure results was analyzed in detail. Combined with the test and calibration works; the mathematical model was established; considering each uncertainty component which affected the measure results of rock permeability. The standard samples of cores; A38(length:2.495cm;diameter:2.456cm);was taken for example. The uncertainty of measure results was carried out by type A and B estimation; the relative uncertainty of the method was calculated. Through reasonable evaluated the components of uncertainty which including causing uncertainty by pressure changing; temperature changing; stability of the measure instruments and vernier caliper reading error. The uncertainty from stability of the measure instruments was detailedly analyzed by the line graph. By evaluating uncertainty of rock permeability in measure results; we find that the biggest influence on total standard uncertainty is the core size; so in the work the operators experimental skills should be paid great attention to.
Measurement on the Shear Property Parameters of the Eruption Powder
Authors: Li Jian Qiao , Li Xiu Juan , Li Hao , Du San Hu , Fan Shi Chao
Published: June 2012

The powder with size distribution was made from eruption to be used for the simulant of lunar soil. One of the most important factors is shear property, to simulate lunar soil behavior under the rover wheels. Therefore, it is necessary to measure the shear parameters of the simulant. The direct shear detector with controlled sample weight was used for selecting suitable method to obtain the shear parameters of the simulant, and finding effect actors for the measurement. Results found that the parameters changed greatly with the powder bulk density (or unit weight), and the calibration was vitally important for measuring cohesion of the powder.
Aluminum/SiC/Nickel-Coated Graphite Hybrid Composites and their Wear Behavior
Authors: Guo M.L. Ted , Tsao C.Y.A.
Published: June 2012

New materials for high performance tribological applications have been one of the major incentives for the development of aluminum-based metal matrix composites (MMCs). MMCs have received attention because of their improved specific strength, good wear resistance, higher thermal conductivity than ceramics, lower coefficient of thermal expansion, etc. Traditionally, lubricant externally added plays an important role in reducing wear in the application of wear resistance materials. However, self-lubricating materials are more desired than materials to which lubricant needs to be applied periodically, especially for wear parts difficult to be accessed, since solid lubricant contained in the former can be released automatically during the wear process and reduces wear.
Long-Term Electric Conductivity of (Nb,Y)-Doped Bi2O3 Solid Electrolytes for Solid Oxide Fuel Cells
Authors: Wei Wen Cheng J.
Published: June 2012

Two oxides, Y2O3 and Nb2O5, were doped into Bi2O3-based electrolyte in a composition of (Bi 1-x-y,Nb x,Y y)2O 3, where (x+y)=0.12 to 0.2 and the x:y ratio 3:1 to 1:3. The delta-phase retention, the oxygen vacancy order-disorder transformation, the ionic and electric conductivity were investigated by various techniques. The long-term conductivity of the dense electrolytes was determined showing moderate degradation due to phase transformation possible triggered by surface evaporation of Bi-oxide. The best retention of the conductivity is about 60% after 300 hr test.
Power Modulated Plasma-Polymerized Gradient Anti-Fingerprint Transparent Protective Coating with a Gradient Composition
Authors: Chang Shiun Wei , Chen Chun Ming , He Ju Liang
Published: June 2012

Polymeric materials have been widely used as flexible substrates and housing parts of modern electronic wares. However, their low hardness and scratch resistance must be improved by additional protective surface coatings, which require not only mechanical durability but also additional functions such as surface hydrophobicity, oleophobicity as well as anti-fingerprint performance. To satisfy these, a power modulated plasma polymerization technique was designed to synthesize a transparent compositional gradient coating on polycarbonate (PC) substrate. Firstly, a constant flow rate of tetramethyldisiloxane (TMDSO) precursor was introduced where higher plasma power was employed to deposit a hard H-C-Si-O bottom layer. The plasma power was then decreased meanwhile admitting increased fluoromethane (CF4) gas flow as the second precursor to obtain a top layer with low surface energy. The hard bottom layer acts as a strong mechanical support and the top layer gives additional hydrophobicity and oleophobicity. Ultimately, the coating shows that a pencil hardness of 3H and Scotch-tape adhesion of 5B improves its protective function. A water contact angle of 105° and oil contact angle of 31.7° can be obtained. The coated specimen remains an optical transparency of 90% close to bare PC material. Comparing with commercialized screen protectors, the developed coating shows superior protective and anti-fingerprint performance.
Properties and Structure Investigation of Rare Earth-Doped Zinc Aluminum Silica-Phosphate Glasses
Authors: Ciang H.Y. , Hsu S.M. , Yung S.W. , Chen Y.J. , Lin C.H. , Hsu C.H. , Lin J.S. , Lin J.
Published: June 2012

This study explores a series of optical, thermal, and structural properties based on zinc-aluminum phosphate glasses that doped with varied rare earth (RE) elements Yb2O3 and P2O5 components replaced by SiO2. It was found that for 60P glasses system, 7 mol% Yb2O3 doped has the maximum fluorescence but quenching when Yb2O3 is doped up to 9 mol%. In addition, with increasing the content of Yb2O3 the absorption intensity increased. According to Raman spectra, we found the Yb3+ and Si4+ ions for the impact of network structure of glass, SiO2 added to make the network structure of phosphate glasses at 450-500cm-1 and 600-650cm-1 were formed O-T-O bond and T-O-T bond(T=Si, Al).
Creep-Recovery Behaviors of Anisotropic Conductive Adhesive Film with Temperature and Hygrothermal Aging
Authors: Gao Li Lan , Chen Xu , Gao Hong
Published: June 2012

The effects of temperature, stress level and hygrothermal aging on the creep-recovery behaviors of anisotropic conductive adhesive film (ACF) were investigated experimentally using a dynamic mechanical analyzer (DMA). It is found that the initial strains, instantaneous strains, and creep or recovery rates increase with increasing temperature，however decrease with increasing hygrothermal aging time. The change of creep or recovery rates at low temperature is apparent, however the creep or recovery rates increase obviously at temperatures above 25 oC with increasing stress level. For the hygrothermal aged ACF, the time to reach steady creep stage or steady recovery stage is reduced significantly compared with the unaged sample. The strain jumps at instantaneous loading decrease visibly and the strain jumps at instantaneous unloading decrease slightly with increasing aging time. And the strain jumps at instantaneous loading and unloading increase with increasing stress level for the unaged and aged ACFs.
Simulation of the Effects of the Physical Properties on Particle Formation of Pulsated Orifice Ejection Method (POEM)
Authors: Fu Yi Fan , Dong Wei , Li Ying , Tan Yi , Yi Ming Hui , Kawasaki Akira
Published: June 2012

A simulation method was used to study the effects of physical parameters, including the contact angle between molten metal and material of orifice, surface tension and viscosity on particle formation of POEM. Droplets can be stably obtained only when the contact angel is at least 90° or larger, as well as the surface tension is adequate. Within a wide range, viscosity has little effect on droplet formation; as the viscosity increases, necking time is postponed and vibration time is shortened.
Cuprous Oxide/Copper Particles Prepared by a Facile Wet-Chemical Reduction Approach as Anode Material for Li Ion Batteries
Authors: Bian Ya Juan , Yang Meng , Zhao Xiang Yu , Ma Li Qun , Jin Chuan Wei , Ding Yi , Shen Xiao Dong
Published: June 2012

Cu2O/Cu composite particles were successfully synthesized by a novel facile template-free chemical reduction route at room temperature. X-ray diffraction (XRD) results showed that the sample mainly consisted of the Cu2O phase coexisting with a few Cu phases. Scanning electron microscopy (SEM) images indicated that the regular particles with a cubic shape about 2-3 μm is Cu2O. In addition, the electrochemical behavior of the Cu2O/Cu composite electrode and copper electrode during the charging and discharging process were both investigated. It was found that the first discharge capacity of Cu2O/Cu composite electrode was up to 650 mAh•g-1, which is much higher than the theoretical capacity of Cu2O (about 375 mAh•g-1). The additional capacity is attributed to the electrodeposition of lithium on pure copper, confirmed by the electrochemical property of copper as the anode material of the lithium-ion battery. The copper electrode presented a high discharge capacity of 280 mAh•g-1 during the first cycle. However, a large irreversible capacity as same as the cuprous oxide electrode was observed during the first charging process. It is indicated that deposition of lithium on the Cu particle surface acts as a barrier preventing the contact between the Cu and the electrolyte. Furthermore, the Cu2O/Cu composite electrode can exhibit reversible capacity of 210 mAh•g-1 at a charge-discharge rate of 30 mA•g-1 after 40 cycles.
Control of the Flight Vehicle Cable over Wide Spectrum Radiation Effects Simulation Experiment Research
Authors: Lv Yi
Published: June 2012

According to the aircraft is under complex work hard to electromagnetic environment performance analysis of the issue, a vehicle body and control lead in ultra-wideband high power microwave (UWS-HPM) under the irradiation of coupling effect and experimental study. Use back to lose signal simulator with the repetitive; the change control the length of the wire, radiation orientation, irradiation parts and other measures to make the experiment generality. The results of the study show that: aircraft in more than 25 kV/m of field UWS-HPM irradiation, interference and make its crash. Interference coupling mechanism is energy electromagnetic pulse through the control lead into the control box, and influence the formation of the control order. On the basis of experiment, this paper analyzes the interference with various factors coupling relation, which for electromagnetic protection equipment provides a theoretical basis.
In-Plane Cushioning Optimization of Multilayer Regular Triangular Honeycombs
Authors: Sun De Qiang , Cai Meng , Cao Wen Ting
Published: June 2012

A finite element model is designed to obtain the mechanical parameters about cushioning property of multilayer regular triangular honeycombs under the in-plane crushing loadings with high impact velocities. A simplified energy absorption model is put forward to evaluate the energy absorption performance, which shows that the optimal energy absorption per unit volume is related to dynamic plateau stress and dynamic densification strain. Both depend on the configuration parameters of representative cell and impact velocity. From the physical analysis and discussion of the numerical results, the empirical formulas of dynamic densification strain and dynamic plateau stress are suggested in terms of configuration parameters and impact velocity. Based on these empirical formulas, a feasible cushioning optimization algorithm is put forward and presented.
Research on the Memory Cutting Model of Shearer
Authors: Xu Zhi Peng , Wang Zhong Bin
Published: June 2012

Automatic" and "less people" in fully mechanized working face is the target of China's coal industry development, and the key to achieve this goal is the automation of coal mining. According to the previous technology of memory cutting cannot adapt to the complicated geological condition in China, this paper proposed the technology of shearer self-adaptive memory cutting based on fuzzy control theory, the shearer positioning system and fuzzy control system of self-adaptive cutting. These systems can get the message of shearer's position and attitude at any point, trace the memorial cutting path automatically, judge whether the shearer cuts rocks based on fuzzy control theory and find the optimal scheme when it works. The authors make the experiments of path tracing in laboratory and the experiment of shelf-adaptive adjust in Xi'an Coal Mining Machinery. All the experimental results show that this technology not only can realize the shearer memory cutting, but also can discriminate the abnormal state of shearer cutting rocks, then adjust the drawing speed and drum height automatically.
Screen-Printing-Based Fabrication of Silver Patterns on Polyimide Substrate
Authors: Yang Fang , Su Wei , Yao Li Bei , Liang Li Fang , Liu Yu Xin , Yu Shu Juan , Zhu Yong Fei
Published: June 2012

A simple method for fabricating silver circuit patterns on polyimide (PI) substrate was developed. Firstly, partially potassium hydroxide (KOH) modified pattern was produced on the surface of PI film via a screen printing process. Then the silver ions were doped into the interior of the PI substrate through an ion-exchange reaction. Finally, the silver circuit patterns with the lines of 200 µm width were formed on the PI substrate surface due to the reduction reaction of dimethylamine borane (DMAB). Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, infrared spectra (FT-IR) and contact angles analyses were conducted to study the morphology, composition and structure of the obtained silver patterns on the PI substrate. This approach is simple and versatile, and need not the expensive apparatus, which is a promising candidate for a broad range of application in high-density circuitry electronic industry.
Fatigue Behavior Research of TCS Typical Welded Joints
Authors: Tian Jun , Li Qiang , Liu Zhi Ming , Zhang Gui Qing , Zou Hua
Published: June 2012

This paper has mainly concentrated on the abutting joints corner joints and lap joints of TCS stainless steel, which are produced by TaiYuan steel plant. It has used group method and fluctuation method to test the fatigue limits and p-S-N curves under 95 percent degrees of confidence and 90 and 50 percent degrees of fraction surviving of the six types of joints. These will give technique assurance and data support to welding bogie design. It has also used scanning electronic microscope to observe the typical specimen. The fatigue source and cracking reason of the specimen which will provide reference for welding methods for increasing fatigue strength of such welded joints and establishing the welding procedure were analyzed. The research in this paper will provide basic data for the applications of TCS stainless steel in new heavy load wagons.
A Detection System of Tool Condition Based on Image Processing Technology
Authors: Kou Xing Yuan , Wang Chen Sheng , Li Lei
Published: June 2012

This paper focused on introducing a real-time detection system of tool condition based on image processing technology and determined final algorithm after analyzing several different operators of edge detection. Firstly, the system will complete an acquisition of tool image, and transfer it to the computer. Then the image will be processed by some digital processing algorithms. At last, we can get the tool wear according to the size change of a tool. The result of this study showed that the detection system and its image processing solution could give a desired result. The detection accuracy could reach macron level, and the degree of automation could be improved too. So the system can be used to better meet the needs of high precision and high-speed in modern production.
Concurrent Engineering and its Key Technologies of Product Design
Authors: Wang Shan , Liu Jing Ping
Published: June 2012

Under the intense market environment, concurrent engineering is considered to be an effective method to improve product competitiveness by more and more enterprises. As a new product development mode, it directly accelerates the design process of new products. Based on introducing the basic concepts of concurrent engineering, this paper discussed its key technologies in detail, such as process reconfiguration, DFX, PDM, CAX and TQM.
Failure Analysis of Slurry Pump Impeller in Chehe Dressing Plant
Authors: Zhong Yan Yu , Wang Dai Li , Zhu Xian Wang , Guo Qiang , Peng Ling , Liu Yu , He Hang Min
Published: June 2012

Chemical composition and metallographic organization were analyzed for the failure characteristics and main reasons of the imported slurry pump impeller used by Chehe Dressing Plant China Tin Group. A series of larger long strip form carbides found on the metallographic organization, which improving cut apart trend on matrix seriously, was the main reason of the impeller failure. Proper amount of vanadium, titanium and rare earth complex modifier can refine carbides and improve their morphology. The best mortar proportion was identified in the laboratory analysis conditions through the wear experiments.
Finite Element Analysis for Hydraulic Support
Authors: Wu Pei Dong , Kong Jian Yi , Gao You Jin , Xiong He Gen
Published: June 2012

The paper was mainly research on hydraulic support by finite elements method. It took a certainly type of hydraulic powered support as an example. All parts of hydraulic support were analyzed in finite element analysis software Ansys Workbench12.1. The simulation data was compared with test data and the relative error factor was discussed, it indicated that three-way pasting the strain foil could generate much more low relative error than other ways or pasting foils in pressure frame test.
Simulation and Analysis of Angle-Variable Linkage of Multi-Functional Mechanical Based on ADAMS
Authors: Miao Yong Hao , Zhu Min Jun , Zhao Xue Jian
Published: June 2012

Based on the epidemic of multi-functional furnishing, this paper presents the design of an angle-variable linkage through introducing the movement and compositing of this mechanism, modeling as well as analyzing the motion, excising kinematics simulation to the key parts. The mechanism presented successfully deforms accurately and locks stably under various conditions, satisfying the functional requirements of multi-functional furnishing.
Non-Repair Dynamically Balanced Device of Wheel Set in Vehicles
Authors: Liu Chao , Zou Chao , Wang Dong Ju , Ge Zai Lin
Published: June 2012

In order to make the mass distribution of the wheel set symmetrical about the axis of the wheel axle, which is able to remove the periodical exciter source and many consequences coming from it, including having negative effect on the stationarity and stability during the running of the train, shortening the lifetime of the wheels, bearings and many other parts of the train, design a set of balanced device to regulate the mass center of the wheel set. The set of device collects data by relevant detection devices in order to find the mass distribution condition, and then regulate the circumferential positions of the objects with a certain mass in the tapered groove which can make the mass distribution of the wheel set symmetrical about the axis of the wheel axle. The device has many advantages, such as simplicity, high precision, excellent regulating effects, and, at the same time, conquers the disadvantages of many other ways. For the time being, the means to solve the problem are mainly Adding Weight Method and Removing Weight Method, which both cause physical damage to the wheel. Furthermore, these two methods have a lot of disadvantages, such as low stability, limited effect, limited repairing numbers and high labor strength. The device not only conquers these disadvantages of the two methods, but also has many advantages, and in the future, it can be automatically controlled by microcomputers. Wheel sets are very essential to the running of the train, whose quality has outstanding effect on the safety and quality of the running of the train, especially in the condition that trains run faster and faster, which requires wheel sets to meet higher standards on dynamic balance, especially for new high-speed bogie. Thus, the device has a large economy benefit and society benefit.
Study on Novel Automatic Steel Wire Bundling Machine Hydraulic Control System
Authors: Li Cheng Qun , Li Shi Yong , Gao Liang
Published: June 2012

This paper introduces a new type of automatic steel wire bundling machine for bundling process, which includes a hydraulic action process, mainly do some researches on the hydraulic control system. The system chooses PLC as the core control component, puts forward the hardware of control system and control flow. Eventually we have been designed the control program.
Research of Characteristics of a Remote Control Weapon Station's Muzzle Vibration when Shooting on the Move
Authors: Dai Dong Ming , Mao Bao Quan , Xu Li , Wang Chuan You , Wu Yong Liang
Published: June 2012

Through analysising the structure of the Remote Control Weapon Station (RCWS) and simulating shooting on the move to obtain the characteristics of the muzzles vibration, we use the three-dimensional modeling software SolidWorks and dynamic analysis software RecurDyn to build the integrated dynamic model with road, cars and guns. Meanwhile we verify the correctness of the model. At different speeds and different road conditions we did the dynamics simulation of the Remote Control Weapon Station for the continuous firing on the move and obtained the vibration characteristics of the muzzle, which provided a reference for the operator to control the Remote Control Weapon Station in more stable conditions and improved shooting accuracy.
A Particle Swarm Optimization Algorithm and its Application in Hydrodynamic Equations
Authors: Zhou Jian Hui , Zhao Shu Zhong , Yue Li Xi , Lu Yan Nan , Si Xin Yi
Published: June 2012

In fluid mechanics, how to solve multiple solutions in ordinary differential equations is always a concerned and difficult problem. A particle swarm optimization algorithm combining with the direct search method (DSPO) is proposed for solving the parameter estimation problems of the multiple solutions in fluid mechanics. This algorithm has improved greatly in precision and the success rate. In this paper, multiple solutions can be found through changing accuracy and search coverage and multi-iterations of computer. Parameter estimation problems of the multiple solutions of ordinary differential equations are calculated, and the result has great accuracy and this method is practical.
The Review of Computational FE Software for Creep Damage Mechanics
Authors: Liu De Zheng , Xu Qiang , Lu Zhong Yu , Xu Dong Lai
Published: June 2012

This paper reports a review on the computational (finite element) software for creep damage analysis. Firstly, it summarizes the current state of how to obtain such computational capability then it concludes with a preference of in-house software. It further reviews the validation practice. Finally, it completes with an outlines of the approach to be used in the developing in-house FE software.
A Photographing and Shooting Device Delivery System
Authors: Chen Jia Chuan , Liu Jing Yu
Published: June 2012

Related to the technological field of Photographing and Shooting Support Device, a Photographing and Shooting Device Delivery System includes shooting track and its Device Case. A shooting track covers at least a set of track-flexible track units. Each single unit in the meantime owns two main tracks and at least two horizontal track axes which inset between the two main tracks. The horizontal track axis can meet the needs of the length-adjustment devices in stretching out and drawing back the length of axes. A single Shooting Track Device Case consists of a Roker, Case itself, two Pulley Mechanisms that attached to the bottom of the Case, as well as a position device that has the Rocker fixed. The Rocker can take apart and connect with the Case through Position Device. At least one axis moving mechanism is attached to the Pulley Mechanism Device, which can collapse the length in order to the change of axis. In doing so, it will not only cut down the expense but also save labor. By replacing the tripod spider in positioning through the Rocker, it can boost enormous convenience, make shooting in a low angle into a reality, and occupies relatively a smaller space compared with the tripod spider.
Dynamic Simulation of the Interaction between Motion Components of Twin Tripod Slider Universal Joint Based on ADAMS
Authors: Chang De Gong , Gao Xin Jun , Zhang Li Zeng
Published: June 2012

The paper, importing the three-dimensional solid model of twin tripod slider universal joint built by drawing tools-SolidWorks into multi-body dynamics software, analyze the force state of the interaction between the moving parts, derive the motion rules of the key components on condition that friction and resistance torque. Which provide a solid theoretical basis for the studies in the later part of dynamics characteristics and fatigue characteristics.
The Change of d-Electron Occupancy of Ni in Ni92Tm8 (Tm=Ta, Nb, Mo, Cr, Mn) Alloys Measured by Electron Energy Loss Spectroscopy
Authors: Yang W.G.
Published: June 2012

The electron energy loss spectroscopy (EELS) of Ni in Ni92TM8(TM=Ta, Nb, Mo, Cr, Mn) alloys and pure Ni has been collected. Thed-electron occupancy of Ni is measured from the white-line intensity of EELS. It is found that the changes ofd-electron occupancy of Ni is very small after alloying.
Hydrothermal Preparation and Photocatalytic Activity of Different Morphology Titania
Authors: Wang Huai Yuan , Zhu Yan Ji , Yu Zhen , Zhu You Zhuang , Chen Ying
Published: June 2012

TiO2 samples with various shapes like flake, nanofiber and large grain were synthesized by template-free hydrothermal method with rutile TiO2 or tetrabutyl titanate (Ti (OC4H9)4, TBOT) as precursor. Photocatalytic degradation performances were investigated by using methyl orange (MO) as modeling pollutant. The results shown that pure mesoporous anatase TiO2-Grain showed the highest photocatalytic activity (3.7 times higher than P25), which is due to a combinative effect of anatase phase and high specific surface areas. The bi-phase flaky TiO2 also have higher activity than P25. While, nanofiber with TiO2(B) phase has the lowest photocatalytic activity. The large sized TiO2 grain can be separated and recycled easily after reaction.
β-Ni(OH)2 Nanospheres Synthesized via the Easy Hydrothermal Method
Authors: Fu Xiao Ming
Published: June 2012

β-Ni (OH)2nanospheres have been successfully synthesized with nickel nitrate as nickel source and stronger ammonia water as precipitant by the hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by X-ray diffraction (XRD) and Scanning electron microscope (SEM). XRD shows that the phase of the samples isβ-Ni (OH)2. SEM confirms that the increase of the reaction temperature is propitious to the synthesis ofβ-Ni (OH)2nanospheres, which are synthesized at at 180 °C for 48 h with pH=9 by the hydrothermal method.
Studies on Mechanical Properties and Structure of LLDPE/Nano-Montmorillonite Composites
Authors: Liu Yu Xin , Yang Qi , Yang Fang , Zhu Yong Fei , Mo Xian Zhong
Published: June 2012

Linear low-density polyethylene (LLDPE)/nano-montmorillonite (nano-MMT) composites were prepared by melting method. Mechanical test, scanning electron microscope (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and small angle light scattering (SALS) measurements were used to characterize the mechanical properties and structure of the LLDPE composite. The results indicated that the impact strength of LLDPE decreased with the increase of nano-MMT content. However, the tensile strength firstly increased and then decreased. The aggregation of nano-MMT in LLDPE happened at larger content. The spherulite size and crystallinity of LLDPE reduced with the addition of nano-MMT. Furthermore, it was found that the structure of the spherulite was destroyed by the nano-MMT. The microcrystal size of LLDPE also decreased with the increase of nano-MMT content.
Microstructure and Mechanical Properties of 6061 Aluminum Alloy by Laser Welding with Filling Wire
Authors: Xu Fei , Guo Ya Fei , Gong Shui Li , Chen Li , Guo Lu Yun
Published: June 2012

The laser welding with filling wire (LWFW) could not only keep the advantages of laser beam welding (LBW), but also reduce the assembled accuracy before butt-welding and improve the weld quality significantly. In present work, the microstructure and mechanical properties of 6061 aluminum alloy sheet by LWFW have been studied. The results show that the main microstructure characteristics of joint by LWFW are columnar microstructure near the fusion zone and the equiaxed dendritic grains in the center of the weld. And the boundaries of those grains become unclear after the heat treating. A large quantity of ageing strengthening particles precipitate dispersedly during the process of the heat treating, which cause that the average microhardness value of joint by LWFW could be improved significantly after the heat treating. The ultimate strength and the yield strength of 0.2% of the joints could reach the level of the base metal after the heat treating, while the elongation after fracture of the joints could reach 83.3% of the base metal. The tensile fracture presents typical ductile rupture. Therefore, the LWFW is an effective method for 6061 aluminum alloy.
Discussion on Processing Technology of Small Modulus Involute Spline
Authors: Zhang Bao Guo
Published: June 2012

Spline shaft is widely used as one of the important parts in machinery, It is complex in manufacturing process, its appearance quality and size precision and the comprehensive mechanical performance requirements of high. Small modulus involute spline rolling technology has many advantages, Can reduce the cost, improve quality and The use of reliable.Cold rolling process is currently the main processing mode for small module splines, but the special machine is too expensive.This article describes how to achieve a small modulus spline cold rubbing process by transforming an existing thread rolling machine while without buying the expensive special machine. The focus is on the problems encountered in the process of equipment transformation: design of cutters, control of the workpiece diameter and how to solve the fault spline gear in the course of processing.
Effect of Particles Concentration on the Properties and Microstructure of Ni/TiO2 Group EMR
Authors: Tan Suo Kui , Song Xiao Ping , Qiao Li , Guo Hong Yan , Ji Song , Zhao Hong
Published: June 2012

By means of mechanical properties test and microstructure observation,the relationship between mechanical properties ,microstructure graph of core-shell Ni/TiO2group particles concentration of EMR and different electric field, magnetic field or electric-magnetic field have been researched. It is found that with increasing of particles concentration, the properties are increased. But there is a critical range value, too high or too low particles concentrations are harmful to properties and microstructure. The best particles concentration of Ni/TiO2particles is about 30%. In the same field with increasing concentration, particles chain of electrorheological fluid under certain electric field become more strong,brawnier and interweaved each other.
Luminescence Properties of Er3+-Doped Ga2O3-GeO2-Bi2O3-R2O (R=Na and K) for 1.53 μm Fiber Amplifier
Authors: Zhao Ying Gang , Shi Dong Mei , Wang Xiao Feng
Published: June 2012

An intense broadband 1.53-μm emission with a full width at half-maximum of 51.2 nm and peak emission cross-section of 8.58×10-21 cm2 of Er3+-doped Ga2O3-GeO2-Bi2O3-R2O (R= Na+, K+) glass have been obtained upon 980 nm diode-laser excitation. Effects of alkali metal ions on the thermal stability and spectroscopic properties of Er3+-doped Ga2O3-GeO2-Bi2O3 glass have been investigated. It is found that the incorporation of Na+ replacing K+ into Er3+-doped Ga2O3-GeO2-Bi2O3 glass can effectively improve the 1.53-μm emission and deduce upconversion luminescence .The results show that Ga2O3-GeO2-Bi2O3-Na2O glass might be an attractive host material for their application in C-band optical fiber amplifiers.
Evolution of the Plastic Deformation Mechanisms in a Compressed Mg-10Gd-2Y-0.5Zr Alloy
Authors: Hou Qing Yu , Wang Jing Tao , Huang Zhen Yi
Published: June 2012

This paper investigates the evolution of the deformation mechanisms in a homogenized Mg-10Gd-2Y-0.5Zr alloy ingot compressed at 300-500 °C and 0.1-20 s-1. It can be found that the basal slip and mechanical twinning are the major deformation mechanisms in the alloy compressed at 300 and 0.1-20 s-1. Increasing the testing temperature to 350 °C, basal slip, non-basal slip and mechanical twinning control the plastic deformation of the alloy compressed at 0.1-20 s-1. When the testing temperatures increase further to 400-500 °C, the mechanical twinning is replaced gradually by the local shear bands which are formed by dynamic recrystallization (DRX) grains (referred as transformation bands). The transformation bands have the trend to form the typical DRX microstructure with increasing the temperatures (might be caused by increasing testing temperatures or strain rates). Besides, the transformation bands can also be found in the sample compressed at 350 °C and 20 s-1when the temperature in the deformation alloy is high enough to activate non-basal slip and form DRX grains at local zone.
Microstructural Features and Mechanical Properties of Autoclaved Saline Soil Brick: Part II: Mechanical Properties
Authors: Qu Lie , Yang Jiu Jun , Chai Shou Xi , Guo Lei , Li Su
Published: June 2012

The effects of different components, autoclaving temperature and time on the mechanical properties of saline soil bricks were investigated. The autoclaved curing schedule is optimized at autoclaving time of 3h and autoclaving temperature of 175. The optimal material formula consists of water-binding ratio 0.2, CaO 15%, finely grinded quartz powder 20 % and sand 20%, under which the compressive and flexural strengths of saline soil bricks reaches 31.9 Mpa and 7.8Mpa, respectively. Reducing water-binding ratio will effectively promote density, while increasing the amount of CaO will enhance the hydrothermal reaction products, density and the mechanical strength. In addition, adding finely grinded quartz powder and sand will further increase the hydrothermal reaction products and restrict volume shrinkage. Furthermore, elevating autoclaving temperature and extending autoclaving time are favorable to increase density and to improve mechanical properties. But autoclaving time exceeds 3h, the compressive strength will be reduced.
Finite Element Analysis of Metal Flow of Finishing Groove in Hot Continuous Rolling Bar
Authors: Zhou Jia Lin , Pan Chen Gang , Zhang Xiao Yong
Published: June 2012

This article established 3D FE model of dual-radius arc finishing groove and tangent expansion angle finishing groove using ANSYS / LS-DYNA software for Wuhan Iron and Steel plant Ф16 hot continuous bar, and analyzed metal flow pattern, stress and strain distribution of two types finishing grooves. The results show that surface stress and strain distribution of dual-radius arc finishing groove have better uniform than them of tangent expansion angle finishing groove, and dual-radius arc finishing groove ensures the stability of the rolled piece in finishing groove, improve the dimensional accuracy and surface quality of rolled finishing product.
The Research of FMS Scheduling and Simulation
Authors: Bian Pei Ying , Bian Pei Song
Published: June 2012

For making enterprise to flexible manufacturing, some scheduling optimization algorithms are correspondingly designed for the main producing equipments, such as the machine tool, transport vehicles, warehouse work machine and so on. At the same time, VC language is used to develop a simulated procedure of a small-scale workshop. Then these scheduling optimization algorithms are inserted to the simulated procedure. At last a simulated example proves the availability of these algorithms for they can shorten the period of manufacture, improve manufacturing efficiency and achieve the purpose of flexible production.
Laser Cladding of Titanium Alloys with Ti+Al+C Powders
Authors: Wang Jian Hong , Bai Pei Kang , Zhang Zhen Lin , Li Yu Xin
Published: June 2012

Laser surface cladding of Ti6Al4V alloy by Ti+Al+C powders (Titanium and carbon powders with an atomic ratio of 1:1 were mixed with 20-60wt.% aluminum powders) was investigated using CO2 laser. TiC particles were in situ formed mainly during the solidification and sizes of TiC particles were varied according to different contents of aluminum powders in the Ti+Al+C system. The results show that the coating had good metallurgical bonding with substrate when Al content was 20% or 40%. The microhardness of coating is 738HV0.5 which was 2 times as that of the Ti6Al4V alloy approximately. The wear resistance of TiC/Al ceramic layer was approximately 3 times greater than that of the Ti6Al4V substrate. 1
First-Principles Study on Al or/and P Doped SiC Nanotubes
Authors: Wu Ai Qing , Song Qing Gong , Yang Li
Published: June 2012

The stability and electronic structures of Al or/and P doped single-walled SiC nanotubes (SWSiCNTs) are investigated by the first-principles theory. It is found that the ones with P atom located at Si site are most energetically favorable both for armchair and zigzag SWSiCNTs, which means that P atom is prone to substitute Si atom. In the same time, we found that the formation energy of Al substituting Si atom is lower than that of Al substituting C atom. The energetic disadvantages of P or Al atom located at C site in SWSiCNTs may be due to the obviously structural distortion in view of that the Al and P atoms are much bigger than C atom. The SWSiCNTs can be routinely modified ranging fromp-type semiconductor ton-type by Al and P substitution doping. These results are expected to give valuable information in building nanoscale electronic devices.
Recent Progress in Hydrogen Storage Characteristics of Ti-Based Icosahedral Quasicrystal Alloys
Authors: Yang Da Peng
Published: June 2012

cosahedral quasicrystalline phase (I-phase) formed in a number of Ti-based alloys, and the I-phase is well ordered and thermodynamically stable in the alloys. Because Ti-based icosahedral (i) quasicrystal phases, which have a new type of translational long-range order and display noncrystallographic rotational symmetry, are believed to possess a large number of tetrahedral interstitial sites in their quasilattices. Ti-based I-phase alloy was considered as one of the most promising hydrogen storage materials due to thermodynamical stability, suitable chemistry affinity and low cost. Recent year, the Ti-based I-phase alloys containing crystal or amorphous phases were prepared, and microstructure and hydrogen storage characteristics were investigated. Ti-based I-phase alloy becomes one of the most promising hydrogen storage materials due to thermodynamical stability, low cost and high hydrogen capacity, and exhibited good electrochemical hydrogen storage capacity and cycle life property.
Simulation of Deployment Process with Large Deflections for Coiled Flexible Shells Based on Prestress Initialization Method
Authors: Zhao Guo Wei , Zhang Zhan Zhi , Huang Hai , Guo Hua
Published: June 2012

For coiled flexible shells, theoretical formulas of calculating the stress distribution are derived and applied to initialize the prestressed status of the shells before deploying. Following the prestress initialization, dynamic simulation of elastic and elasto-plastic deployment processes with large deflections of the shells is conducted by explicit time integration. It is shown that the simulation based on prestress initialization method is feasible and efficient. Comparing the deforming process and the energy history of the elastic deployment with that of the elasto-plastic deployment, the effects of plasticity are embodied as slowing the deployment process down and speeding the kinetic energy dissipation up, while making the shell unable to return to its original configuration, and keep more residual strain energy. A primary approach to decrease the effects of plasticity is improving the initial prestressed status of the coiled flexible shells.
Measurements of Optical Parameters of the Fat Emulsion
Authors: Yang Li , Sun Jian Hua , Wu Ai Qing
Published: June 2012

The rules that optical parameters of the biological tissue simulating liquid ( Intralipid-20% diluents ) were changed along with the change of temperature were investigated by CCD imaging and photograph analyzing system, based on the diffusion approximation and extensive boundary conditions. It was found that the absorption coefficient is gradually increasing and the reduced scattering coefficient is gradually decreasing along with the increase of temperature. And by measurements of diffusing reflection light and the transmission light by CCD, the anisotropy factor of Intralipid-20% diluents was obtained experimentally. The measured value by CCD was compared with the theoretical value. The results were approximately consistent. It was shown the measuring method by CCD not only is easy operation but also has a high accuracy.
The Synthesis and Ion-Exchange Property of Inorganic Material Mg2Mn0.5Ti0.5O4
Authors: Jiang Jin He
Published: June 2012

Magnesium-manganese-titanium oxide (Mg2Mn0.5Ti0.5O4) was prepared by a coprecipitation/thermal crystallization method. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treatments of Mg2Mn0.5Ti0.5O4 caused Mg2+ extractions of more than 73%, while the dissolutions of Mn4+ and Ti4+ were less than 13%. The experimental results have proved that the acid-treated sample has a capacity of exchange 12.6mmol•g-1 for Li+ in the solution.
Temperature Field Division at Liupanshan Area of Ningxia for Asphalt Pavement Performance
Authors: Cong Zhuo Hong , Zheng Nan Xiang , Jin Yan
Published: June 2012

In order to choose asphalt reasonably, the asphalt pavement performance zone at Liupanshan area of Ningxia was studied according to 30 years’ climate datum. According to the statistics analysis of 30 years’ air temperature and field temperature in the hottest and coldest month, it was suggested that: the high design pavement temperature should be determined according to the average high field temperature in seven consecutive days with 98% reliability, the low design pavement temperature should be determined according to the lowest field temperature of a year with 98% reliability. This method was applied at Liupanshan area to decide the asphalt pavement’s temperature field, which was in accordance with Liupanshan area’s conditions
Study on Production of Burning-Free Brick Using Chinese Kuancheng Iron Ore Tailings
Authors: Zhou Xiao Yu , Yu Yi Zhong , He Shao Xian , Li Qing
Published: June 2012

Based on the analysis of components of Chinese Kuancheng iron ore tailings, burning-free brick test block were produced using local iron ore tailings and blast furnace slag as raw material, portlant cement as mineral glue, and parget as mineral activator. The optimum formula and production process were obtained with experiment of compressive strength of test blocks. The optimum ratio of iron ore tailing to blast furnace slag is between 5:5 and 6:4, parget composition is between 6% and 8%, and cement usage can be reduced to 10%. After curing, burning-free brick compressive strength of 17.5Mpa can be reached without sandiness phenomenon, and performance far exceeds the M10 burning-free brick standards. The formula of burning-free brick proposed in this paper can solve the problem of mineral waste pollution in Kuancheng area
Effect of Shock Time on the Thermal Stress in the Single Lap Joint
Authors: You Min , Mei Chun Zhi , Chen Cun Jun , Li Jian Li , Li Mei
Published: June 2012

The effect of the thermal shock time on the thermal stress distributed in the adhesively bonded steel single lap steel joint under a 100 C thermal shock was investigated using elasto-plastic finite element method (FEM). The results showed that the temperature is symmetrically distributed to the bondline in the overlap region and the lowest one at the mid-bondline increases as the time of the thermal shock elongated (4 s to 40 s). And all the peak values of the stresses at the mid-bondline and the zone of negative Sx in adherend decreased as the time of the thermal shock elongated.
A Simulation Study on Stress and Strain Change Rule for Channel Steel Cold Roll Forming Process
Authors: Chen Lin , Wu Chen Xia , Wang Yan
Published: June 2012

The paper describes the research on deformation mechanism method of channel steel cold roll forming by finite element software ABAQUS, and typically analyzes stress and strain change rule of the fifth pass cold-formed process. Simulation results show that: on the whole, the equivalent strain and stress value of three typical parts tend to increasing with time increases
Analysis of Massive Platform Concerte 3-Dimensional Hydration Heat of Corrugated Steel Webs Bridge
Authors: Wang Jun , Li Zi Qing , Hao Xian Wu
Published: June 2012

with the continuous development of bridge engineering，the massive concrete has been widely used in large-scale bridge foundation engineering. But it often has the problems of crack and deformation, which infuenced the entirety and durability of the whole structure seriously. In this paper, a hydration heat analysis of the platform of a corrugated steel webs bridge is carried out by using MIDAS/Civil structure finite element method analysis program, the analysis summarizes the temperature distribution regulation of platform concrete influenced by hydration heat and the temperature changing regulation affected by time. Meanwhile, some countermeasures of preventing the crack of concrete are put forward.
Research on Influencing Factors of Wood Residual Fiber Foaming Cushion Material
Authors: Cao Bin , Xiao Sheng Ling , Pan Xiao Qing
Published: June 2012

A wood residual fiber foaming cushion material was prepared by using gathered wood fiber as main raw material, starch/PVA adhesive as matrix, adding a certain amount of foaming agent and related additives, hot compression molding to shape up. This paper makes an investigation of single factor on the product’s surface quality and related mechanical property. Results show that with the amount of wood residual fiber increases, the rebound resilience of the product first increases then decreases. The density decreases along with the amount of foaming agent increases. The compression strength and compression modulus of the product increases along with the amount of wood residual fiber increases, it decreases along with the amount of foaming agent increases.