bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Ball Milling Time on the Microstructure and Mechanical Property of Cu90Al10 Alloy
Authors: Li C.J. , Chen G. , Yuan Q. , Tan J. , Teng L. , Zhang Q.X. , Zhu Xin Kun
Published: August 2013

Nanostructured Cu90Al10 alloy powders were prepared by high energy ball milling mechanical alloying (MA). Up to 10 at.% Al could be dissolved into copper by mechanical alloying at room temperature. Effects of milling time on phase transformation, structural characteristics, and mechanical property of powders were investigated by using X-ray diffraction (XRD), Optical Microscopy (OM) and microhardness tester. The results show: with increasing the milling time, the powder particle size increased gradually, and then it tended to be homogeneous. The grain size of the alloy decreased gradually, but the yield strength increased with the extension of the ball milling. After 30h milling, the grain size reached the minimum value of 9 nm, and the yield strength obtained the maximum value of 511 MPa.
Study of Microstructure and Mechanical Properties of Extrued Spray Forming Al-8.5Fe-1.3V-1.7Si Alloy
Authors: Zhang Rong Hua , Zhang Yong An , Zhu Bao Hong
Published: August 2013

In this paper, the Al-8.5Fe-1.3V-1.7Si alloys were fabricated by spray forming and extrusion process. The microstructure and mechanical properties of the alloy were investigated by means of metallographic, scanning electron microscope and tensile test. The results indicate that the tensile strength of the extrued alloys can reach 353MPa, the yield strength 300MPa, elongation 19.12%, at room temperature. At 250°C, the tensile strength of the extrued alloys can reach 221MPa, the yield strength 208MPa, elongation 13.33%.
Preparation and Properties of C/SiC Composites via Liquid Silicon Infiltration Process
Authors: Li Guang De , Zhang Chang Rui , Hu Hai Feng , Zhang Yu Di
Published: August 2013

Three-dimensional short carbon fiber felt reinforced C/SiC composites were prepared by the liquid silicon infiltration (LSI) process. The influences of different porosity ratios, carbon coating, and heat treatment of C/C substrates, on the properties of C/SiC composites were studied. The optimized porosity ratio is calculated as 40.1% when the volume percent of carbon fiber (including carbon coating) is 23%, and after screening porosity ratio from ~55% to ~20%, the optimized experimental result (39.5%) is highly in accordance with the design value. The C/SiC composite after process parameter optimization, has a flexural strength and modulus of 125 MPa and 120 GPa, respectively. The C/SiC composite without carbon coating has a flexural strength of only 77 MPa, showing carbon coating plays a key role. The heat treatment of C/C substrate at 1600°C also improves the flexural strength of C/SiC composite for nearly 50%, and porosity rearrangement and interface weakening are believed to contribute such improvement.
First-Principles Investigations on Magnetic Properties in Off-Stoichiometric Ni2MnIn Magnetic Shape Memory Alloys
Authors: Bai Jing , Gu Jiang Long , Li Yan Bo , Zhao Xiang , Zuo Liang , Raulot Jean Marc , Esling Claude
Published: August 2013

Ni-Mn-In is a new type of magnetic shape memory alloy, but in the stoichiometric Ni2MnIn, the martensitic transformation cannot perform. Thus, in order to obtain the appropriate Curie temperature TC and the martensitic transformation temperature TM, the composition adjustment must be carried out around the stoichiometric Ni2MnIn. The process of composition adjustment would induce various point defects. This paper scientifically studies the magnetic properties of off-stoichiometric Ni2MnIn alloys by first-principles calculations.
Corrosion Behavior of the Transient Liquid Phase Diffusion Bonding Joint of TiNi Shape Memory Alloy and Stainless Steel in Hanks' Solution
Authors: Wang Ying Ling , Gao Qiu Zhi , Sun Gui Fang , Ye Jie
Published: August 2013

The transient liquid phase diffusion bonding (TLP-DB) was employed to join TiNi shape memory alloy (SMA) and stainless steel (SS) with an interlayer metal of Ag-Cu eutectic metal foil.The corrosion behavior of the TLP-DB joint in Hanks solution at 37°C was investigated by electrochemical methods.The results show that the corrosion resistance of the joint is comparable to, but lower than that of base metals during the early anodic polarization, and the corrosion rate of the joint is between that of TiNi SMA and SS in the transpassive region at high potentials. The corrosion resistance of the specimens in Hanks' solution is associated with the surface quality, mircotructure and the intermetallics. Both TiNi SMA and SS display the characteristics of localized corrosion with a little pitting corrosion, while the joints mainly show the characteristics of pitting corrosion concentrated on the enrichment Cu phases.
Study on Alloy Particles and its Deposited Metal Microstructure and Properties
Authors: Sun Jun Sheng , Wang Hao Meng , Jiao En Li , Zhang Guo Qiang
Published: August 2013

A technology conception of producing filled metal particles which use steel scraps of steelworks as the main raw materials for welding was proposed in this paper. It provides a new resource for raw materials which are used to process welding material and the steel scraps are used sufficiently, reasonably and in high value-added at the same time. According to the wearing conditions of loader when it exploits and loads the river sand, the Fe-Cr-C alloy particles were designed. The technology of medium frequency induction furnace - centrifugal atomizer was used to get the alloy particles in 0.1~5.0mm diameter. Melt alloy particles by submerged arc welding and study the microstructure and properties of the deposited metal. Engineering application tests were also carried out and yield highly desirable results.
The Research Method and Performance Analysis of the Curing Process of E51-593 System and TDE85-593 System
Authors: Li De Feng , Liu Yu Yan , Kang Hong Jun , Tan Hui Feng
Published: August 2013

As the pre-research of analysis and performance characterization of resin system curing process in space environment, this paper designed the research method for resin system curing process research, and taking epoxy E51 and TDE85 as research objects, did the verifying experiment about the research method in terrestrial environment. The verifying experiment confirmed the feasibility of the research method, and got the conclusion that the results came from DSC and FTIR are not exactly consistent, the method of FTIR is more suitable for curing degree testing in the curing process. The mechanics performance testing showed that the rupture properties of tensile fracture surface of two systems chosen in the experiment evolved from brittle fracture to ductile fracture and the toughness of TDE85-593 was better than that of E51-593.
Experimental Study of the Characterization of Ultra-High Molecular Weight Polyethylene Fiber Plastic
Authors: Wen Yao Ke , Xu Cheng , Dong Xue Hua , Wang Shu
Published: August 2013

Ultra-high molecular weight polyethylene (UHMWPE) fiber reinforced plastic (UFRP) is an integral part of hard body armor. The intensive study on the material characterization of UFRP can help to understanding the bulletproof mechanism and behind-armor blunt trauma (BABT) well, and thus improve the performance of body armor. The research presented in this paper represents an effort to characterize the properties of UFRP under quasi-static and ballistic loading. The tensile behavior along the fiber direction and through thickness compressive behavior were obtained using an universal material testing machine. Experiments show that the tensile strength and compressive strength of UFRP are approximately 500MPa and 650MPa, respectively. The through thickness shear strength of UFRP was also obtained according to the punch-shear testing, and a set of special clamp was used to clamp the samples. The composite has been found to have a low shear strength. The UFRP was impacted by a 4.8mm diameter spherical fragment with velocity 694m/s~920m/s, to study the ballistic performance. And the height and radius of the deformed conical region on the back face of UFRP were captured using high-speed photography technique. Results show the maximum transient height of the cone is about 3 to 4 times greater than the final height of the cone, and the radius of the cone reaches to 59±7.4mm. The ballistic limit of the 11mm thick UFRP is approximately 800m/s.
Preparation and Characterization of poly(L-lactide) /poly (ε-caprolactone) Composite Films for Food Packaging Application
Authors: Yang Ji Yi , Qin Yu Yue , Cao Jian Xin , Yuan Ming Wei , Liu Shi Qi , Yuan Ming Long
Published: August 2013

Poly (L-lactide) (PLLA) and poly (ε-caprolactone) (PCL) were produced by solution mixing and cast into films. The films were characterized by morphological, mechanical, and barrier behavior tests to evaluate the effect of the PCL. The micrographs of the fractured surfaces showed the morphology of the phase separated system, with the dispersed PCL phase higher than 30%. The elongation at break of PLLA was improved significantly (p<0.05) in the blends while the tensile strength decreased significantly (p<0.05) with increase of PCL content. WVP of PLLA/PCL films significantly decreased (p < 0.05) by blending with PCL. When the ratio of PLLA/PCL increased from 100/0 to 50/50, WVP of PLLA/PCL films decreased from 1.85±0.15 (×10-14 kgm/m2sPa) to 1.27±0.06 (×10-14 kgm/m2sPa). The results showed that PLLA/PCL blend can be a novel composite film for food packaging applications.
Synthesis and Characterization of PBA-P(MMA-HPMA) Core-Shell Latex Particles
Authors: Sun Zhao , Liu Yan Ping , Liu Xi Jun
Published: August 2013

In this paper, Taken the methyl hydroxypropyl acrylate (HPMA) as functional monomer, a novel poly (butyl acrylate)-poly (methyl methacrylate-methyl hydroxypropyl acrylate) (PBA-P(MMA-HPMA)) core-shell latex particles were synthesized by the method of pre-emulsion semi-continuous seeded emulsion polymerization. The structure and morphology of core-shell latex particles were characterized by the way of laser particle size analyzer, transmission electron microscope (TEM), fourier transform infrared spectrometer (FTIR), nonaqueous acid-base titration, differential scanning calorimetry (DSC). Experimental results showed that the average size of PBA-P(MMA-HPMA) core-shell latex particles was 340nm and the average size of PBA core latex particles was 270nm. The functional monomer HPMA really participated in shell layer copolymerization, when the dosage of HPMA was 8% of shell monomer, HPMA content in the shell was the largest and reached 2.16%. Tg value of the copolymer P(MMA-HPMA) was firstly increased and then reduced with the increasing of HPMA content in shell.
Anomalous Refractions Based on Photonic Band Modulation of Photonic Crystals
Authors: Dong Guo Yan , Zhou Ji
Published: August 2013

Due to the existence of photonic bandgap derived from the periodical dielectric structure in wavelength scale, many novel optical phenomena can be demonstrated in photonic crystals (PhCs). Anomalous propagation of electromagnetic waves in X-band is demonstrated experimentally in a two-dimensional triangular lattice PhC. The experimental measurements of electric field are carried out in a near-field scanning system. The phenomena of anomalous refractions are observed and analyzed in respect of anisotropy of equal frequency surfaces in the PhC. The analysis results of numerical simulation are compared with the experimental measurements and good agreements are obtained.
Hierarchical Porous Materials for Supercapacitors
Authors: Li Yan Hua , Zhang Shi Ying , Yu Qu Min
Published: August 2013

Hierarchical porous materials with improved properties due to enhanced mass transport through the material and a high surface area and pore volume have been used in numerous applications such as catalysts or catalyst supports, energy storage and conversion, filtration, medical diagnostics, and medical therapies. This paper presents a review of recent progress in hierarchical porous materials for supercapacitor electrodes. Hierarchical porous materials comprise of hierarchical porous carbon, hierarchical porous metal oxides and hierarchical porous composites. An emphasis is placed on the performance of hierarchical porous materials for supercapacitor electrodes in terms of specific capacitance, power density, energy density, rate capability and cyclic stability.
Interface Reaction of CNTs/Al Composites Fabricated by High Energy Ball Milling
Authors: Yue Gang , Cai Xiao Lan , Wang Kai Jun , Sun Hong Peng , Chen Ya Guang
Published: August 2013

CNTs/Al composites were fabricated by high energy ball milling. The phase structure and consti- tuent of the preparation process were analyzed. The interface reaction and the formation process of the interface reaction product Al4C3 were discussed by thermodynamics and kinetics. The result shows that no Al4C3 can be found in Al-CNTs composite powders fabricated by high energy ball milling. Al4C3 exists in the inter- face after pressureless sintering. And no appreciable amount of Al4C3 was observed in CNTs/Al composites directly by powder metallurgy. It shows that high energy ball milling can benifit the interface reaction. And the purified CNTs, never milled, is stable in the preparation process of CNTs/Al composites by powder metallurgy.
Preparation and Luminescence Properties of ZnO–SiO2–B2O3–Na2O:Sm3+ Glass
Authors: Zhang Yong Qiang , Liu Quan Sheng , Li Mei
Published: August 2013

The 40ZnO-30SiO2-20B2O3-10Na2O:Sm3+ glass was prepared by high-temperature melting method. The structure and composition of the glass matrix was investigated by Infrared spectrum (IR). The absorption, excitation and emission spectra of the samples were tested, and the results showed that the glass can emit orange shade under light excitation. The emission peaks at 565nm, 604nm and 650nm wavelength were corresponding to the 4G5/26H5/2, 4G5/26H7/2 and 4G5/26H9/2 transition emission of Sm3+, while the 4G5/26H7/2 transition emission was the strongest. So the best Sm3+-doping molar concentration was 0.4%. The spectroscopic properties indicated that 40ZnO-30SiO2-20B2O3-10Na2O: Sm3+ was expected to become a new conversion material.
Effect of Graphene Layer Number on the Performances of Graphene Nanosheets Counter Electrode for Dye-Sensitized Solar Cells
Authors: Xu Shun Jian , Luo Yu Feng , Zhong Wei , Xiao Zong Hu , Luo Yong Ping , Lai Jian Hong
Published: August 2013

Four types of graphene nanosheets (GNs) with different graphene layer number were employed to fabricate counter electrode for dyesensitized solar cells (DSCs), with emphasis on understanding the influence of graphene layer number on the properties of the counter electrode and the device. The results show that with the graphene layer number of the GNs increases from 3 to 8, both efficiency and fill factor of the GNs based DSCs firstly climb and reach a peak at 6 of graphene layer number, and then decline with further increasing. Electrochemical impedance spectroscopy (EIS) reveals that when the graphene layer number of the GNs increases from 3 to 6, the decreased sheet resistance of the electrode and the strengthened capability of electrolyte diffusion in the electrode result in the improvement of the photovoltaic performances of the DSCs. However, when the graphene layer number further ascends to 8, the weakened capabilities of both catalytic activity of the electrode for the reduction and electrolyte diffusion in the electrode lead to the poor photovoltaic performances of the device.
The Propagation of In-Plane Waves in Multilayered Elastic/Piezoelectric Composite Structures with Imperfect Interface
Authors: Lan Man , Wei Pei Jun
Published: August 2013

The dispersive characteristic of in-plane elastic waves propagating through laminated piezoelectric phononic crystal with imperfect interface is studied in this paper. First, the transfer matrix method (TMM) and the Bloch theorem are used to derive the dispersion equation. Next, the dispersion equation is solved numerically and the dispersive curves are shown in Brillouin zone. The pass band and the stop band of in-plane wave propagating normal to the laminated periodic structure with spring imperfect interface are investigated. The effects of the spring or mass parameter are discussed.
Space Charge Limited Current and Magnetoresistance in Si
Authors: Jin Xin , Wang Hai
Published: August 2013

Mott and Gurney point out1, for defect-free semiconductors, I-V curve deviates from linear Ohmic type to nonlinear space-charge limited behavior at high electric field. A surprising large magnetoresistance (MR) has been reported in space-charge limited region by Delmo2-4 recently. In present work, I-V and MR curves of silicon samples with different doping concentration are measured. It is observed that I-V curve enters into space charge region at lower voltage in heavily doped samples, however, space-charge limited current is absent in lightly doped samples. Two samples show different types of MR curve. In heavily doped samples, 8% MR is acquired at 3kG and the value of MR increases linearly up to 17%, while MR increases slowly up to 11% in lightly doped samples. It is believed that the dopant and trap in N-type silicon has a strong influence on the space-charge limited current and MR.
Photoluminescent Characteristics of ZnS Quantum Dots Synthesized in Non-Aqueous-Phase
Authors: Liu Jing , Ying Ming , Tan Yu Ling , Xi Bo
Published: August 2013

ZnS quantum dots (ZnS QDs) synthesized in aqueous solution is easy to gather a mass, which always results in low quantum yield. So, in this study benzene was used as reaction medium in which ZnS QDs with different hues were synthesized, and the hues of ZnS QDs were depend on the molar ratio of Zn (CH3COO)2 and Na2S·9H2O. The results show the emission spectra of ZnS QDs shifts with the change of the precursor molar ratio but the absorption peak at 310nm is not. The emission peaks centered at 430nm and 580nm at higher molar ratio [Zn2+]/[S2-] with blue-violet emitting phosphors; but, ZnS QDs synthesized at higher molar ratio [S2-]/[Zn2+] have orange-red emission at 580nm only. The X-ray diffraction analysis shows the crystallinity of ZnS QDs is better at [Zn2+]/[S2-]=1:10, which are typical zinc blend with nanorod structure.
FEM Analysis and Experimental Study on Dipper Handle of Excavator
Authors: Qin Hai Bin
Published: August 2013

The dipper handle is most important to design and manufacture as the main component of excavator. That many fracture accidents lead to great losses. So it is necessary that study influence of the impact to service performance. In this paper the FEM is used to analyze dipper handle to find out the weakness in the structure. The improved dipper handle was used in the device and inspected by handle test. The stresses are measured in some conditions and the results were also in consistence with the theoretical analysis. Improved 3D model is rebuilt using the ANSYS to recalculate the stress. Since the improved dipper handle was used in practice to now, fracture accidents have been not happened again.
The Performance Analysis of Humanoid Massage Robot Arm Based on SolidWorks
Authors: Pang Zai Xiang , Gong Lin An , Jiang Da Wei , Liu Tie Jun
Published: August 2013

The strength and stiffness of humanoid massage robot arm are the main factors that they affect the dynamic characteristics and positioning accuracy under the action of the load. In order to analysis the strength and stiffness characteristics of humanoid massage robot arm. With SolidWorks we establish parametric model and by finite element analysis software ANSYS analyses the strength and stiffness of key parts and components. Emulational results show that the stiffness and strength of humanoid massage robot arm that we design and invent meet the design requirements, lay a foundation for further optimization design.
Modeling and Simulation of Big Pendulum Hammer with Natural Coordinates
Authors: Zhang Ke Wei , Hu Zhi Gang , Guo Peng Wei
Published: August 2013

The dynamic of a type of play equipment, Big Pendulum Hammer, was modeled and simulated in computer and the approach of natural coordinates was adopted to build its equation of motion. In order to obtain appropriate natural coordinates, a two-step selection method was chosen, which based on concept of natural coordinate system (NCS). The two-step method treats selecting natural coordinates for a rigid element as building an actual NCS which should be adapted from a standard NCS. In order to automate the process of adaptation for 18 rigid elements in the model of Big Pendulum Hammer, a four-step self-adaptation method was also adopted, which can help automate the selection of natural coordinates for multi-rigidbody systems.
Effect of Z-164D on Grinding Efficiency of Oolitic Hematite and its Mechanism
Authors: Li Guo Feng , Wang Ze Hong , Cheng Xu
Published: August 2013

The effect of Z-164D dispersant on the grinding efficiency of oolitic hematite was studied. The content of-0.074 mm in the ground product was increased by 30.15% by using Z-164D dispersant which weight was 2% of oolitic hematite compared without using any dispersant under the optimal technological conditions of the grinding aid experiment. It was considered that the content of-0.074 mm in the ground product was increased by 26.52% by using Z-164D dispersant which weight was 1%, so it was confirmed that the weight of Z-164D dispersant was 1% of oolitic hematite from the perspective of economic benefit finally. On this basis, the absorption characteristics of the Z-164D on the oolitic hematite surface which could change the pulp viscosity and the surface experience of particles were studied and the mechanism how Z-164D dispersant improved the grinding efficiency of oolitic hematite was revealed.
Parametric Design of Wave Spring Based on SolidWorks
Authors: Lu Mo Wu , Yang Xu , Lu Chang
Published: August 2013

This paper introduces a parametric modeling method of wave spring. The common wave spring parametric design programs are written with VBA in the SolidWorks platform by calling the relevant API (application program interface) functions according to the spring entity structure characteristics and service conditions, which obviously reduces the designers repetitive operations in the modeling process and shortens the spring design cycle.
Research on Method of 3D Models Viewpoint Control Based on VRML
Authors: Pan Tong , Li Xiao Jing , Wang Hao Peng , Liu Ting Ting
Published: August 2013

It is important for human-computer interaction smoothly with viewpoint controlling in complex virtual space based on VRML. Analyses the application characters of viewpoint during the realization of 3D models with VRML, and researches the methods of viewpoint control from the point of the viewpoint interactive technology of 3D models, focuses on approach of viewpoint control using Viewpoint node and NavigationInfo node, and provides the demos of the relevant VRML programs.
Analysis and Optimization Design on Drive Axle Housing of Light Commercial Vehicle
Authors: Zhou Yu Cun , Sun Miao Zhong , He Li Juan
Published: August 2013

Drive axle housing is one of the major load-supporting components of trucks. This paper takes a drive axle housing of a light commercial vehicle as the research object. The model of the drive axle housing is established by Pro/E software, on the basis of this model, the finite element analysis is carried by ANSYS to get the results of stress and strain under the defined constraints and loads, to find the weak links in the design. Aiming at achieving the goal of the least weight, the permission stress and displacement are defined and the thickness of the drive axle housing is considered as the design variable to optimize the design. The result of optimization design provides a theoretical guidance for truck driving axle housing designing.
Fixture Planning of Valve-Body Part Based on Machining Capability of NC Machining Center
Authors: Zhang Guo Zheng , Zhou Yuan Zhi
Published: August 2013

To solve the problem that fixture planning of the batch valve-body part of car, the NC machining process of the batch valve-body parts based on the normal vector is analyzed in this paper. The different fixture planning of the valve-body part based on the capabilities of three-axis and four-axis and five-axis NC machining center (MC) is discussed. According to the questions that the feature of different machined position holes and faces of valve-body part on three-axis NC machining center, the multi-piece fixture planning and multi-position rotational fixture planning are designed. The results indicate that the proposed fixture planning can improve the machining productivity, which based on cabapility of three-axis NC machining center (MC).
Performance Analysis of Single Stage Compression Cycle with an Internal Heat Exchanger
Authors: Xue Gui Jun , Liang Da Wei , Liu Guang Da , Li Shui Qing , Zhou Zhen Jiang
Published: August 2013

With the increase of outlet pressure to compressor, all cycle COP is a reducing trend except R744, in addition, R744 compression cycle has an optimum high pressure. When the inlet temperatures of compressor gradually increase, the performances of all cycles basically unchanged, but the R744 compression cycle has an increasing trend. With the increasing of outlet temperature to the condenser, the performances of all cycles are decreased; instead with increasing of the evaporating temperature, all cycle COP is an increasing trend.
Combined Back-EMF Estimator with High-Frequency Signal Injection for Wide Speed Range Sensorless Control of PMLSM
Authors: Lu Hua Cai , Yao Xuan Yu , Ti Juan
Published: August 2013

This paper describes a composite sensorless position and speed detection algorithm designed for permanent magnet linear synchronous motor (PMLSM). A high-frequency voltage signal injection method is used at starting and low speed, and a back-EMF integrate method is used at high speed, and the two kinds of method are fused by weighting method in the transition speed area. Simulation results show that estimation accuracy of this composite estimation method is satisfactory, and the sensorless control system based on this method has good dynamic response characteristics within full speed.
Fashion Customization Design Model Analysis in China
Authors: Liu Li Xian
Published: August 2013

Most fashion customization companies are lack of effective design planning in China, meanwhile, the conventional theory is not suitable to the particularity of fashion customization design. Based on classification of fashion customization brand model, after relevant thinking and exploration, fashion customization design model can be constructed. Fashion customization design model based on strategy and tactic parts, after overlapping these two parts, the design method will be not so obscure, but more standardization and scientific. The study of fashion customization design model is a way of thinking about design model. To Chinese fashion customization companies, it is not only a revolution of design concept, but also an exploration of design method. It provides some references for those companies to perform specific fashion customization design.
Based on the Sustainable Development Conception of Research the Shanghai Tourist Souvenirs Design
Authors: Wu Chun Mao , Li Pei
Published: August 2013

Along with the comprehensive strength increased, peoples living standard has been improved in China. However, tourism souvenirs in China have been difficult to satisfy the consumers pursuits. Based on the current situation of Shanghai tourism souvenir design, through the investigation, the thesis found the common problems of Shanghai tourist souvenirs. Combined with the conception of sustainable development in the disassembly, recyclable, maintainability, reusability, it puts forward the sustainable conception which would apply new inspiration to Shanghai tourist souvenirs design, so as to promote the development of Shanghai tourist souvenirs design.
Study on the Prediction of Rolling Force of 16MnR Hot Rolled Plate
Authors: Li Xiao Long , Wei Ying Li , Zhang Yuan , Tian Ya Qiang , Song Jin Ying , Chen Lian Sheng
Published: August 2013

Considering the insufficient recrystallization of austenite has an effect on deformation resistance, meanwhile, referring to the plate of controlling parameters in the hot rolling process, analysis and forecast of load parameters of rolling mill and motor per pass of its rolling process. The result shows that: The production of modern steel rolling, involved in the process, equipment problems associated with rolling load, must be taken into account in its internal organization of metal in the deformation process. The less recrystallization is, the greater the deviation of the calculated results. This should be distinguished from the traditional concept of rolling.
Design and Analysis about Twist-Roller Transmission Based on the Precision Aerostatic Guide Way
Authors: Deng Ming Min , Long Wei
Published: August 2013

At present the twist-roller transmission cannot meet the needs of adjusting the positive pressure and the twist angle in the meanwhile. For this phenomenon, based on requirements of accuracy and velocity, non-level speed controlled twist-roller transmission is designed and its working principle is particularly discussed by friction transmission theory. Using the Pro-E software to build a model of transmission, then ADAMS is used in kinematics analysis for the designed transmission agent. The results show that, the simulation value is close to the theoretical on the CM-position and the velocity along the axis direction of the spindle. That is to say, the transmission can meet the design demand.
Research and Design of Dynamic Stiffness Testing System for Actuator
Authors: Chu Jian , Zhang Feng
Published: August 2013

Actuator is widely used in the control system. Among all characteristics of an actuator, dynamic stiffness is an important indicator; it must satisfy the requirement to inhibit the control surface’s flutter. This article described the definition of dynamic stiffness of actuator, introduced the importance of the research of dynamic stiffness of actuator, designed a test bench for dynamic stiffness testing and putted forward a method which based on Programmable Logic Controller to simulate a signal generator which generated sinusoidal signal load to test the dynamic stiffness of actuator, found out a worst point of the actuator’s dynamic stiffness, improved the stability of the actuator system and avoided the occurrence of flutter at the frequency.
Isolated Heat Transfer Gaskets for Medium Energy X-Ray Telescope MED Electric Control Box Effect on Random Vibration Performance Study Based on the Finite Element Method
Authors: Wu Nian Peng , Meng Chun Ling , Li Yun Long , Zhang Wen Hua
Published: August 2013

In order to understand Isolated Heat Transfer Gaskets placement scheme's influence on the dynamic performance of the MED electric control box,on the basis of theoretical analysis, Finite Element Modal analysis and random vibration analysis have proceeded for different Isolated Heat Transfer Gaskets placement program, and comparative analysis of the two results. Analysis results provide the basis for further optimal design of the MED electric control box.
Sluice Risk Consequences Comprehensive Evaluation Based on Grey Relational Analysis
Authors: Zheng Hao Yao , Sheng Jin Bao , Peng Xue Hui , Wang Yin , Zhao Xue Ying
Published: August 2013

Many sluices had low standard and poor quantity, which were damaged seriously after several decades use. In sluice safety levels classification standard, there are quantitative indexes and qualitative indexes, which isnt convenient to assess sluice risk consequence objectively. In order to improve the technology of sluice safety comprehensive evaluation and reduce the risk of sluice operating, grey relational analysis method was used to evaluate the sluice according to the specific conditions of the sick-dangerous sluices and some special managing principle. The result is objective and reasonable, so we assess sluice easily, providing a new way for sluices risk consequences comprehensive evaluation.
Mechanics Analysis and Dynamic Modeling of a Wall Climbing Robot
Authors: Bo Wei Jie , Gao Xue Shan , Li Fang Xing , Ma Yi Tong , Cui Yun Fei
Published: August 2013

A kind of theoretical analysis method in wall climbing robot design is presented in this paper. Using this method, a flexible wall climbing robot is developed that can be well adopted in small irregular places. Firstly, an optimization mechanism is given based on the effective utilization of aerodynamic attraction produced by a centrifugal blower. Kinematics model of the robot is represented, then linear velocity function and angular velocity function of the robot are deduced. Dynamic model based on Lagrange equation is established, which can be a theoretical foundation for control system design. Finally, simulation results show that the dynamic model and the method are reliable since the curves of driving torque match the change of negative pressure.
Analysis Method of Screw Algebra for Motion Characteristics of a 4-URU Parallel Metamorphic Mechanism
Authors: Zhang Zhong Hai , Li Duan Ling , Li Chun Xia
Published: August 2013

A new 4-URU parallel metamorphic mechanism is proposed. A new method using screw adjacency matrix to describe the structural transformation of metamorphic mechanisms is put forward. This method overcomes the limitations of existing topological description method which cannot analyze the metamorphic mechanisms spatial structures and motion characteristics. Then the screw algebra method for analyzing the metamorphic mechanisms motion characteristics is introduced in detail. Firstly, screw motions homogeneous system of linear equations is determined by the screw adjacency matrix. Then the equations basic solution system determines the anti-screw system. Finally calculate the moving platforms motion screw system. Thus the metamorphic mechanisms motion characteristics, such as spatial structure in different configurations, the number of components and joints, degrees of freedom are obtained.
A Portable and High-Resolution System for Sleep Apnea Monitoring
Authors: Hu Yu Xuan , Hu Yi , Ye Shu Ming , Zheng Xiao Xiang
Published: August 2013

As a major indicator of Obstructive Sleep Apnea Syndrome (OSAS) in clinical diagnosis, the monitoring of sleep apnea plays an important role in medical treatments of modern society. This paper proposes a portable sleep apnea monitoring system, which is of high-precision and low-power consumption, and capable of performing the long-term monitoring of OSAS patients multiple physiological parameters in clinical treatments. In the system, the AC modulated detection is adopted, and low amplification ratios are utilized in forestage and a high-resolution AD converter is designed in post-stages. Thus, it is able to acquire, analyze, and process physiological signals in real-time. In addition, ultralow-power chips are used in control system to save the power consumption. The experimental results show that our monitoring system has the strengths of high stability, low-power consumption (peak current90mA), and strong anti-interference ability, which demonstrates the potential in practical applications.
Orthogonal Experiment Analysis of Mechanical Thermal Conductivity on Multi-Component Fillers
Authors: Xu Shi Meng , Ma Run Bo , Du Jian Hua , Liu Jun Hong , Jin Qi
Published: August 2013

Filled the N330 carbon black, silica T80 carbon black and Al powder and Fe2O3 magnetic nanoparticles, the rubber composites on multi-component electromagnetic fillers were prepared according to orthogonal experiment analysis, and the preliminary experiment conclusions of the filler prescription designs were given; Based on the experiment design, the mechanical properties and thermal conductivity of the rubber composite were tested, and the testing results were analyzed by using variance analysis. Thus, the paper shows that the effects of N330 on rubber mechanical properties are significant, and the effects of Al powder on the rubber thermal conductivity are significant. Moreover, it is highly emphasized in this paper that the orthogonal experiment design must be carefully explored before the tests are executed.
The Experimental Study on Detection of Dust Concentration by Back Scattering Method
Authors: Deng Xu Yi , Ni Xiao Chang , Wang Bin , Li Tong , Song Zhen Ming
Published: August 2013

The result of the experiment using Labview real-time data acquisition and analysis, and considered the backward scattering Angle, detection range, chopper modulation frequency and test factors, thus draws the dust concentration and the relationship between the voltage detection. The results show that the modulation frequency up to 145 HZ, backward scattering Angle as close to ,the detection range as far as possible close to the flue, dust concentration and detection voltage can better meet the linear relationship for the future, it improves industrial smoke concentration on-line measurement provides a basis for the application.
Based on Profibus-DP and Modbus Protocol Conversion Inverter Communication Interface Design
Authors: Chen Zai Ping , Chen Zhi Tong
Published: August 2013

With the development of factory automation technology, Profibus-DP fieldbus and Modbus protocol has become the most widely used communication technology at home and abroad, but the choices which can accomplish the data conversion between these two devices is not enough. According to the Modbus RTU communication agreement for the use of frequency converter, the article provides a kind of communication interface based on Profibus-DP and the Modbus communication protocol conversion which mainly introduces its hardware and software design scheme, and expounds the dependability and real-time performance of the communication interface.
A Novel R-2R Current-Mode DAC Used for Digital-Calibrated ADC
Authors: Shen Xiao Feng , Hu Rong Bin , Chen Xi
Published: August 2013

In this paper, a kind of novel DAC architecture is proposed. Compared to the traditional DAC architecture, the proposed is a multistage one. In order to improve precision, we use a kind of feedback bias circuit, which can minimize the effect of the base currents. A 16-bit DAC transistor-level circuit is implemented in 0.18um SiGe process. The simulation results show that the DAC using the proposed architecture has higher resolution, and better static and dynamic performances than the traditional one.
Study on Helical-Bevel Gear Worm Forging by Finite Element Analysis
Authors: Yang Tung Sheng , Chang Cheng , Chang Sheng Yi
Published: August 2013

This study applies the finite element method (FEM) to predict maximum forging load and effective strain in helical-bevel gear forging. Maximum forging load and effective strain are determined for different process parameters, such as modules, number of teeth, and die temperature of the helical bevel gear forging, using the FEM. Finally, the prediction of the power requirement for the helical-bevel gear warm forging is determined.
Control System Design of High-Power Induction Cooker
Authors: Zou Zi Ming , Cui Shi Yun
Published: August 2013

This artical designed and produced a half-bridge series resonant induction heating cooker induction cooker whose power is15kHz . The main controller of the cooker is S3F9454, and SG3525 is for adjusting the frequency, the principle of induction heating is the basis of its , by the load current feedback loop and PI we can get the adjustment of the frequency and power of the system. The practical use shows that the output power of the system is stable, and it has the advantages of high thermal efficiency and fast heating.
Intelligent Wireless Alarm System Based on 51 Single Chip
Authors: Zhao Liang , Cheng Yi
Published: August 2013

In order to meet the increasingly high residential security and intelligence requirements, the paper presents an easy method to operate reliable performance of intelligent wireless alarm system, which can realize the signal automatically detection and telephone automatically alarm.Intelligent detector monitors to the disaster through a wireless way when the alarm signal is sent to the host,and the host microprocessor will automatically control telephone interface circuit.
Study of Hydraulic Servo System Based on Fuzzy Sliding Mode Algorithm
Authors: Yang Kun , Liu Cai Jun , Liu Shu Min
Published: August 2013

Based on the situation that the hydraulic position servo system is easily influenced by the external interference and the parameters of which are different with time-varying, the fuzzy control can soften the buffeting and the sliding algorithm has no the same problems as the hydraulic position servo system, a brandly-new fuzzy sliding control algorithm is designed. In the simulation process, within the parameters of simulated time-varying and outside strong interference, the results show that the hydraulic servo system based on fuzzy sliding mode control algorithm has a greater resistance to internal and external interference and time-varying parameters.
Flow Passage Modification and Experimental Verification of a Multi-Stage Centrifugal Pump
Authors: Zhang Quan , Shuai Zhi Jun , Zhou Pan , Li Wan You
Published: August 2013

In this paper the seat vibration acceleration response was reduced through flow passage modification of the centrifugal pump which could decrease the fluid excitation of the pump. CFD simulation technology was applied to optimize the fluid field of the multi-stage centrifugal pump, and then the velocity, pressure fluctuation and fluid excitation were concerned to investigate the effect of optimization. Finally, the influence of fluid field modification on the seat vibration response was verified experimentally.
Performance Analysis of Refrigerants R134a Two Stage Compression Cycle with an Expander
Authors: Xue Gui Jun , Liang Da Wei , Liu Guang Da , Li Shui Qing , Zhou Zhen Jiang
Published: August 2013

With increasing of compressor high pressure, the two stage cycle with an expander has a downward trend. With increasing of the evaporating temperature, the two stage cycle with an expander has an increasing trend. With increasing of outlet temperature of condenser; the two stage cycle with an expander has a downward trend. With increasing of intermediate pressure, the performance of the two stage cycle with an expander is decreased.
Improved Ant Colony Algorithm Using in Design of the New Internet of Things Storage Mailbox System
Authors: Huang Ke Wang
Published: August 2013

The paper focuses on improved ant colony algorithm using in design of the internet of things storage and mailbox system. The improved ant colony algorithm solves the problems of the location of the storage mailbox mounting and user selection of optimal delivery.
Study on Applications of Laplacian Spectra for a Network
Authors: Wang Hai Tang
Published: August 2013

Systems composing of dynamical units are ubiquitous in nature, ranging from physical to technological, and to biological field. These systems can be naturally described by networks, knowledge of its Laplacian eigenvalues is central to understanding its structure and dynamics for a network. In this paper, we study the Laplacian spectra of a family with scale-free and small-world properties. Based on the obtained recurrence relations, we determine explicitly the product of all nonzero Laplacian eigenvalues, as well as the sum of the reciprocals of these eigenvalues. Then, using these results, we further evaluate the number of spanning trees, Kirchhoff index.
Grey Incidence Cluster Analysis of Colliery Security Management Evaluating Indicator
Authors: Zhao Shu Ying , Yang Chen Sheng , Song Sheng Wei
Published: August 2013

It is necessary to exactly classify the evaluating indicator of colliery security management, and the classification is also the foundation and prerequisite of colliery security management and evaluation. In this paper, reasonable classification to colliery security management and evaluation is carried by the method of grey incidence cluster. Grey incidence cluster is one kind of grey cluster evaluation in grey system theory. On the basis of lots of investigation, analysis and summary, sample nine coal mines, 13 safety management evaluation，calculate their gray absolute degree, taken given threshold r=0.75，classify these indicators appropriately to simplify the evaluation and examination indicator. Evaluating indicator cluster method is simple and convenient and has the character of strong applicability.
A Practical Approach for Scalable Record Linkage on Hadoop
Authors: Yang Fen Gyu , Chen Ying , Zhang Ye
Published: August 2013

As increasing data have been collected in many applications, we have to face with millions of data in record linkage. With respect to traditional methods, there comes out a big challenge in performance while dealing with massive data. Parallel computing framework, such as MapReduce, has become an efficient and practical way to address this problem. In this paper, we propose a practical 3-phase MapReduce approach that fulfills blocking, filtering, and linking in 3 consecutive processes on Hadoop cluster. Experiments show that our approach functions efficiently and effectively with keeping high recall in contrast to tradition method.
Sentiment Analysis Based on Micro Blog Hot Topics
Authors: Gao Yan , Zhao Wen Qing , Hou Xiao Ke
Published: August 2013

Sentiment analysis on micro blog data has attracted much attention recently. In this paper, according to the characteristics of Chinese micro blog, a method based on semantic rules was provided to analysis emotional of micro blog hot topics. This method considers the adverbs of degree features, adverbs of negative features and emoticons features on the basis of emotional words in the micro blog text. Our proposed method is compared with the method based on emotional dictionary on experiment. The experimental results show that the proposed method is feasible and effective.
The Feasibility of Applying Image Processing Technology to Surveillance in the Small or Medium-Sized Airports and RWSL
Authors: Pan Wei Jun , Xu You Shui
Published: August 2013

The small or medium-sized airports are generally lack of airport surface movement detection equipment due to the insufficient financial budget in early and latter investigation of airports constructions or facilities. The paper studied airfield surveillance in the small or medium-sized airports by image processing technology and also discuss diverse surveillance sources in large airport and RWSL one of most key components in A-SMGCS. The analysis include: physical installation of video sensors, range of surveillance coverage, the flowchart of processing, the algorithm for detecting and tracking the moving objects which is suitable for environment of airfield in airport, the projection method between video image coordinate and airfield plan coordinate and the evaluation index of image processing technology.
The Evaluation of Industry Development Policies of Chinas Five-Year Plan
Authors: Gao Chao , Jin Feng Jun , Fu Juan
Published: August 2013

This study based on the order degree model of industrial structure to make analysis of the national economic and social development plans of the10th and the11th Five-Year Plan, then evaluate and analyze the reasonableness and the implementation effect of industrial structure goals on Five-Year Plan in different provinces. Final analysis conclusions as follows: (1) China has entered the middle stage of industrialization; therefore, the transformation of economic growth and adjustment of the industrial structure have become the main tasks of regional development. (2) Industrial structure goals of the Five-Year Plan do not match its development stage of industrialization in most parts of China. And the improvement of the order degree index of the industrial structure is relatively slow. (3) 11th Five-Year tends to be more reasonable.