bluuebunny/crossref_metadata_2025 huggingface dataset:
Studies on Diamond Brazing Process (Part one)
Authors: Song Cheng , Hua Li , Wei Fa Can , Liu Jin
Published: July 2011

Through scientific experiments, we studied the binder, diamond, solder, uniform distribution and heating curves in brazing. We selected DH temporary binder, compared two kinds of diamond, selected the diamond with fine thermal stability. The experiments adopted diamond with uniform templates, experimenting 13 kinds of solder of which 9 were mixed with diamond for comparison of brazing effects and thermal damage. We optimized solder and brazing process and comprehensive analyzed experimental results. The analysis showed a small amount of DH temporary binder residue in brazing, fine effect in case of low alloy solder brazing temperature, better adhesion of solder and diamond achieved by elements formed by Cr and other strong carbides, sufficient volatilization of temporary binder and other impurities achieved by insulation before 500°C, heating rate of 1°C/min when the temperature it is higher than 20°C-50°C, the solder melting point, and that cooling should be carried out under high vacuum, brazing diamond should have fine thermal stability.
Research and Development of a New Grouting Material for Blast Furnace
Authors: Pei Xiu Juan , Wang Rui Sheng
Published: July 2011

The characteristics and functions of blast furnace grouting material were briefly introduced in this paper. The affects of matrix aggregate formulation, binder types and binder addition to the grouting material were discussed. Based on series of tests and experiments, the optimized matrix aggregate formulation, binder type and binder addition were confirmed. A new grouting material with excellent characteristic parameters was developed.
Self Adaptive Modeling and Deposited Metal Property of Rapid GMAW Forming
Authors: Zhu Sheng , Liang Yuan Yuan , Wang Qi Wei
Published: July 2011

The objective of this investigation is to study the rapid forming based on robot GMAW forming. The work may be divided into two sections. First study the modeling of weld bead profile. Self adaptive layered algorithm of variable direction is employed, which changes the forming direction on the basis of parts geometric character. In addition, the microstructure and performance characteristics of the formed parts are investigated. Its metallographic microstructure along the deposition direction shows obviously layered characteristic. The micro hardness values closely relate to the microstructure characteristics. The fracture mechanism of the part belongs to quasi-cleavage crack.
Study of Fibre Tourmaline/PVA Nanofibre Prepared by Electrospinning
Authors: Hong Wei , Li Qing Shan , Liu Jun , Wang Li Ping , Xing Guang Zhong
Published: July 2011

This is the first time, prepared fiber-tourmaline nano powder use of Fiber-tourmaline. Vinyl acetate, fiber-tourmaline nano powder and EDTA as raw material, use micro-polymer chemistry laboratory equipment, preparation of the fiber-tourmaline/PVA spinning solution. The first time, prepared Fiber-tourmaline/PVA composite nanofibers, use of micro-polymer processing equipment—— electrospinning machine. The samples were characterized and tested the performance of its release anions. Analysis the effects of the fiber-tourmaline powder quantity on the properties of nano-fibers, and to explore the best tourmaline content.
Shearer Shaft Roundness Error of Signal Processing
Authors: Liu Song Yong , Luo Chen Xu
Published: July 2011

For the measurement of shearer shaft geometry signal contain the axis of rotation error and the measurement error, made of two separate programs from shearer shaft the geometric method of measuring signal acquisition and signal processing error. The program is based on the analysis of the shearer shaft Two-point method of roundness measurement method and error separation technique. Using two displacement sensors and a combination of programs to measure the angle sensor, and an equation using the Fourier transform of elimination and separated from the measurement signal roundness. Then, 53H, and wavelet signal Noise algorithm such as the error of roundness error signal separation. Simulation results show that the method has a higher real value and better convergence for coal mining shaft roundness error in the separation of signal processing.
Study on Properties of Collagen/Chitosan Composite at Different Mass Ratios
Authors: Zhou Wen Chang , Liu Yuan , Dan Wei Hua
Published: July 2011

The fibrous materials made from collagen have some shortcomings, such as its mechanical property, water-resistant and thermal-stability. So the mixture is produced by blending collagen with chitosan at different mass ratio. Theirs mechanical, water-resistant and thermal-stability properties of these blending mixtures are characterized by FT-IR, DSC etc analyzing methods. These results indicate that the properties are improved great. Furthermore it obtains that the optimal ratio of collagen to chitosan is about 20:80.
The Study of Green Evaluation Support System in Manufacturing Process Based on Multi Agent
Authors: Zhang Hua , Zhang Xu Gang , Wang Yang Hong
Published: July 2011

Owing to the diversity of green evaluation index and multiple-factor related to the process evaluation, existing green evaluation of manufacturing process lacks a set of effective knowledge management model. It leads to the high cost and inefficiency of analysis and evaluation process. A green evaluation model for manufacturing process based on multi agent is presented. Based on the model, green evaluation support system of manufacturing process based on multi agent is developed with the knowledge base introduced. The implementation strategy of green evaluation for manufacturing process is implemented by the closed-loop knowledge chain, which is composed of knowledge mining, knowledge transferring, knowledge application and knowledge feedback. The feasibility of this system is verified by an instance of the valve stem manufacturing process in a valve factory.
Quick Spherodizing in GCr15 Steel by Mechanism of Divorced Eutectoid
Authors: Chen Qi Wei , Zhu Guo Hui , Cao Shu Min , Zhao Ai Min
Published: July 2011

A novel processing of quick spheroidizing annealing based on DET(divorced eutectoid transformation) mechanism has been presented in this paper. Spheroidized carbide microstructure could be achieved directly by austenite through phase transformation during cooling processing, which is different from the conventional spheroidization annealing where carbide was spheroidized by carbide lamellar gradually resolved and coarsened.The novel processing of spheroidizing annealing presented here will decrease the annealing time from 10-16 hours in conventional processing to around 2-3 hours, which could save about 50% of the energy consumption, comparing to the conventional annealing processing.
Study on Surface Cermets Reinforced by VC Particles Produced in Situ
Authors: Ding Yi Chao , Yin Hong , Wang Jing
Published: July 2011

A new fabrication method for VC-Fe surface cermets by cast-sintering has been developed in the study. SEM and XRD were used to examine the variation of structure of surface composites after casting and solidifying. It was confirmed that the VC particles reinforced surface composites can be in situ produced on the casting surface by the cast-sintering technology. The mechanism of quickly finishing V carbonized reacts and sinter compacting in block during casting was analyzed. The wear-resistance of VCparticles reinforced surface composites was examined on a MM-200 wear-test machine.
Study on Mechanical Property of Al2O3-Based Composite Ceramics Liner of Heavy-Medium Cyclone
Authors: Zhang Li Qiang , Huo Ping , Huang Yong , Li Peng , Yang Rong
Published: July 2011

In laboratory condition, industrial zirconia and alumina were used as raw materials, whose particle size was controlled by ultrafine treatment of mechanical milling. The effects of different firing temperatures and soaking times on mechanical properties of Al2O3-based composite ceramics liner were researched. And the microstructure of samples was studied by scanning electron microscopy (SEM). The results indicate that mechanical properties of samples kept 3 h at sintering temperature of 1600°C with adding 30 wt% zirconia are the best.
Research on Fatigue Life of the Casting Crane’s Girder
Authors: Huang Zhi Cheng
Published: July 2011

Taken a certain type of casting crane’s girder as research object, established its three-dimensional model by using Pro/ENGINEER software, and then import it into the ANSYS program for analysis with ANSYS data access module (DDA), integrating the analysis results and the theory of fracture mechanics, the thesis comprehensively analyzed the fatigue life of the casting crane’s girder with damnification-limit design method. It provided some theory basis and reference for casting crane’s safe operation and fatigue lift design.
Studies on Multihollow PUA-EMA-St Crosslinked Copolymer Beads: Synthesis and Hollow Structure
Authors: Sun Wei Hong , Yan Xin
Published: July 2011

The multihollow and elastomeric beads from polyurethane acrylate (PUA), ethyl methacrylate (EMA) and styrene (St) are prepared by suspension polymerization using n-heptane as porogen and 1,2-divinylbenzene (DVB) as crosslinking agent. The SEM results show that the beads of PUA-EMA-St crosslinked copolymers have many and large hollows on their surfaces and interiors, and the hollow sizes are dependence of the copolymer composition and the dosages of porogen. Average hollow diameters decrease as the dosages of the contents of PUA and porogen decrease.
Research of Plasma Clad Al2O3 Coating
Authors: Zheng Zhan Shen , Zhou Biao , Zhang Li Qiang , Huang Yong , Li Rui Jiao
Published: July 2011

Plasma clad Fe-based Al2O3 coating was fabricated by the way of delivering powder simultaneously, using high-energy plasma beam as a heating source, while the metallurgy combination of the coating to substrate was formed. The organization and performances of clad coating were analyzed by X-ray diffraction (XRD), metallographic microscope, scanning electron microscope (SEM) and micro-hardness instrument. The results indicate that γ-Al2O3 can be obtained by the technology of plasma clad and the good metallurgical bonding of coating to substrate was formed.
Preparation of Microcrystalline Cellulose from Cotton Linter Ethanol Pulp
Authors: Liu Shan Shan , Fang Gui Gan , Deng Yong Jun , Wang Qiang
Published: July 2011

The hydrolysis trials of produce microcrystalline cellulose from cotton linter ethnaol pulp by hydrochloric were investigated. Based on 23 factorial design, fifteen operations were performed by varying S/L, T and t (S/L: solid to liquor ratio, T: hydrolysis temperature, t: hydrolysis time). The charecteristic of product was analyzed by X-RD, SEM and laser granularity distributing apparatus, and compared with commercial MCC. The experimental results indicated that MCC yield and particle size were influenced significantly by those factors. The optimal hydrolysis conditions was S/L=1:7, T=60°C and t=40min, which can resulted MCC yield of 75.3% and size of 21.21µm. Crystallinity of MCC is 63.96% and displayed as rod-shape.
Solidification Simulation of Huge Rectangular Ingot by Different Intensive Cooling
Authors: Ai Xin Gang , Li Sheng Li , Lv Nan , Zhang Dong Wei , Tao Jun
Published: July 2011

In this paper, the solidification and heat transfer of a 60t huge rectangular ingot has been simulated. The solidification rate at pouring finish and the solidification times were simulated for air cooling, soft wind cooling, strong wind cooling, fog cooling, weak water cooling and strong water cooling. Mathematical simulation results tell us that by intensive cooling, the solidification time of the can be obviously shortened, internal soundness can be ensured and the surface quality could be improved.
Water Modelling on the Effect of Trapezoidal Nozzle on Vortex during Teeming in Ladle
Authors: Lin Rui , Yan Zheng Guo , Liu Tao , Yu Jing Kun
Published: July 2011

Based on approximation principle, water model experiment was carried out during teeming in a 60t steel ladle. Based on the previous research work, trapezoidal nozzlein with lager upper cross section was used to decrease the critical level of vortex in order to reduce the slag entrapment to the tundish. Different shape and height of upper part of the nozzle was investigated mainly to inhibit the vortex at the late stage of ladle teeming. When upper shape of trapezoidal nozzle is square, upper height is 20mm and 17mm, and eccentricity of nozzle is 3/4, critical height of vortex is about 34mm and 31mm. In this case, slag entrapment is controlled effectively and metal utilization is optimized more completely.
Permeability Test Method of Concrete Member under Uniaxial Tension Stress
Authors: Yuan Yong , Chi Yang
Published: July 2011

Concrete member is usually stressed in structure. To test permeable behavior of concrete under load is significant in clarifying this characteristic. Currently, most of the methods measure the permeability of concrete specimen without stress. This paper describes a method that measures permeability of concrete subject to a uniaxial tension load. The main components of the test device include two parts. One is tension loading system, and the other is permeability system. The concrete member with 100×100×1000mm is designed to be the sample. A uniaxial tension load could be applied to the prism concrete specimen and the load was allowed to increase by steps until failure. Autoclam is adopted as permeability system. At each ground of the tension load the volumetric water flow through specimen is recorded with data acquisition automatically. The relationship between water permeability and increasing stress could be obtained with the suggested method.
Control of Nitrogen Loss during Co-Composting of Banana Stems with Chicken Manure
Authors: Wu Chun Yuan , Li Qin Fen , Zhang Yu Bai
Published: July 2011

This work studied the effect of basic composting parameters (C/N ratio, turning frequency and moisture), initial pH, nitrogen source and fermenting agent on nitrogen loss (N-loss) during co-composting of banana stems with chicken manure in order to determine the best composting conditions. The experimental results suggested that co-compost with minimum N-loss entails operating at turning frequency with once two days, initial moisture content of 65% and C/N ratio of 25. NH3 volatilization and N-loss were weakened under neutral conditions. Moreover, the effect of additive organic wastes and fermenting agents on N-loss during the banana stems-chicken manure co-composting was significantly different: adding bagasse or fermenting agent M-1 could effectively reduce the release of nitrogen, promotes the nitrogen accumulation, and lead to the increase of total nitrogen (TN) by 6.1 % and 6.5 %, respectively; while N-loss was enhanced with addition of paddy straw and fermenting agent M-2, with TN decreasing rate of 11.5 % and 10.9 %.
Study of Substrate Induced Deep Level Defects in Bulk GaN Layers Grown by Molecular Beam Epitaxy Using Deep Level Transient Spectroscopy
Authors: Ajaz Un Nabi M. , Arshad M. Imran , Ali Adnan , Asghar M. , Hasan M. A
Published: July 2011

In this paper we have investigated the substrate-induced deep level defects in bulk GaN layers grown onp-silicon by molecular beam epitaxy. Representative deep level transient spectroscopy (DLTS) performed on Au-GaN/Si/Al devices displayed only one electron trap E1at 0.23 eV below the conduction band. Owing to out-diffusion mechanism; silicon diffuses into GaN layer from Si substrate maintained at 1050°C, E1level is therefore, attributed to the silicon-related defect. This argument is supported by growth of SiC on Si substrate maintained at 1050°C in MBE chamber using fullerene as a single evaporation source.
The Study on the Early Age Cracking due to the Addition of Silica Fume into Concrete and the Trouble-Shooting Strategy
Authors: Hwang Chao Lung , Chen Chun Tsun , Bui Le Anh Tuan , Kurniawan Fondly Reymont
Published: July 2011

This study is mainly to investigate the early age cracking due to the addition of silica fume (SF) into concrete and to propose Densified Mixture Design Algorithm (DMDA) method as a trouble-shooting strategy. Specimens with different water-to-binder ratio (W/B) and silica fume content were prepared with ACI concrete (W/B = 0.23, 0.35 and 0.47; SF content = 0%, 10%, 20% and 30%) and DMDA concrete (W/B = 0.23, 0.35 and 0.47; coating paste thickness t = 5, 15 and 25 μm). Adding silica fume to the concrete system to replace part of cement may increase the crack intensity, and the rate of water absorption; but reduce the heat of hydration. DMDA method as a problem-shooting technique shows to have a better performance in reducing the crack intensities up to 41% with W/B = 0.23 and the better durability index than that of ACI method.
Synthesis and Photocatalytic Properties of Fe-Doped TiO2 Nanobelts
Authors: Liu Na , Xu Guo Zhi , Li Li , Ji Tian Hao
Published: July 2011

Fe-doped anatase TiO2nanobelts were prepared using layered titanate nanobelts as precursor by two-step hydrothermal process. Various measurement techniques were employed to investigate the morphology and structure of products. The results show that Fe-doped TiO2still remain nanobelt-like and structure as pure TiO2nanobelts. Fe-cations doped in TiO2nanobelts lead to the red-shift of the absorption edge of TiO2nanobelts. The visible-light photodegradation of Rhodamine B on the products exhibits that Fe-doped products with low Fe-content show higher photocatalytic activity than that of TiO2nanobelts or Fe-doped product with high Fe-content.
Composition and Microstructure of a Natural Nano-Structure Mineral: Six-Ring Rock
Authors: Li Qing Shan , Wang Xin , Liu Jun , Xing Guang Zhong
Published: July 2011

Six-ring Rock is widely used as containers of water and additives to produce health care products. In this paper, the composition and microstructure of Six-ring Rock have been investigated by using scanning electron microscopy, energy dispersive spectrometer, transmission electron microscopy, x-ray diffraction and other technologies. Results show that Six-ring Rock is composed of CaMg(CO3)2, SiO2 and KAlSi3O8. Fe atoms exist in CaMg(CO3)2 by replacing Mg atoms. Six-ring Rock shows nano-size lamellar and acerose microstructures on the surface, and nano-size monocrystals in the body. Six-ring Rock is a natural nano structure mineral.
Interfacial Behaviors in SiC Fiber Reinforced Titanium Matrix Composites during Thermal Exposure
Authors: Qu Hai Tao , Ren Xue Ping , Hou Hong Liang , Zhao Bing , Li Shu Xia
Published: July 2011

Interfacial behaviors of SiC fiber reinforced titanium matrix composites during thermal exposure were investigated by SEM, EDS and XRD. The effect of C coating was mainly analyzed. The results showed that C coating can be an effective barrier of the diffusion of Si element. And the C coating of SCS-6 SiC reinforced Ti6Al4V will be almost completely consumed after thermal exposure for 25 hours at 925°C. TiC will be found in the interface when the C coating exists. After C coating is completely consumed, there is Ti3SiC2 occurring besides TiC and the interfacial debonding strength is high. However, without the protection of C coating, the fibers will be consumed and their longitudinal tensile strength will be decreased, and this will affect the service performance of the composites.
Aluminate Green Phosphor with Small Particle Size Used for PDP via Co-Precipitation Method
Authors: Dong Yan , Zhou Yang , Han Xue Lin , Gu Wei Jie
Published: July 2011

Mg doped BaAl12O19:Mn2+ phosphor is one of the most efficient green phosphors for PDP. It is difficult to prepare the phosphor both have small particle size (< 3μm) and high luminescence. In the present work, a BaAl12O19:Mn2+ phosphor with small particle size was synthesized by the chemical co-precipitation method. Phase transformation and particle growth process during calcining process were investigated. The nucleation process was also discussed. The results show that, the phase transformation is complicated, the transition phases include BaCO3, γ-Al2O3, BaF2, BaAl2O4 and two phases contain Mn; The BaAl12O19 phase is formed from the reaction between BaAl2O4 phase and γ-Al2O3 phase, no a-Al2O3 phase appears during the entire process; The formation temperature of pure BaAl12O19 phase is 1200°C, which is lower than that in the high-temperature solid state reaction method. High efficiency BaAl12O19:Mn2+ phosphor with small particle size (< 2μm) and hexagonal flaky shape can be prepared by this method.
Effects of Metallic Ions on Photoluminescence Properties of CdSe/PAMAM Nanocomposites and their Application in Fingerprint Detection
Authors: Jin Yu Juan , Luo Yun Jun , Xu Guo Zhi , Yang Biao
Published: July 2011

Uniform and well-dispersed photoluminescent semiconductor CdSe(Cadmium selenium) QDs(Quantum dots) werein-situprepared stabilized by G4.0-NH2PAMAM dendrimers in water and effects of metallic ions such as Zn2+, Cd2+, Cu2+, Ag+, Pb2+, K+, Na+on the photoluminescence(PL) properties of CdSe QDs were studied using spectrophotometric titration. The results show that Zn2+and Cd2+ions enhance the PL intensity of CdSe QDs, Cu2+, Ag+and Pb2+ions quench the PL intensity, while K+and Na+ions have no obvious effects. Those are attributed to the surface modification of CdSe QDs. Excess Cd2+ions can reduce the non-combination centers, increase the passivation of PAMAM on the surface of CdSe QDs, and form a Schottky-like barrier which enhanced the PL efficiency. Excess Zn2+ions can also increase the PL intensity of CdSe QDs in the same way as Cd2+ions because of the much similar lattice parameters of CdSe and ZnSe. However, a CuSe, Ag2Se or PbSe shell on CdSe QDs emerges due to the substitution of Cd2+ions, which leads to the decrease of band-edge emmiting of CdSe QDs. And the quenching effect of Ag+is stonger than Cu2+and Pb2+because of the lower solubility of Ag2Se formed on the surface of CdSe QDs. Oil latent fingerprints deposited on tinfoil surface treated with CdSe/dendrimer NCs(Nanocomposites)、Cd2+-CdSe/ PAMAM NCs and Zn2+-CdSe /PAMAM NCs emitted bright yellow photoluminescence under ultraviolet excitation of 365nm from an UV LED in the dark., among, fingerprint treated with Cd2+-CdSe/dendrimer NCs and Zn2+-CdSe /PAMAM NCs was detected with better resolving rate.
Energy Conservation Study on Integrated Thermal Insulation Buildings Made of Glazed Hollow Beads Mortar
Authors: Guo Xiu Hua , Li Zhu , Yang Zhuo Qiang
Published: July 2011

In energy conservation design for buildings, interior thermal insulation structure, which is made of glazed hollow beads mortar, works with exterior one of building envelope. By this way, integrated thermal insulation structure made of GHB mortar is constructed. The paper describes its structure, construction technique and energy-saving calculation, which can provide theoretical and practice basis for the further application of this thermal insulation structure.
Differential Scanning Calorimetry (DSC) Analysis of Abaca Fibre (Musa Textile Nee) Reinforced High Impact Polystyrene (HIPS) Composites
Authors: Agung E.H. , Sapuan S.M. , Megat Ahmad M.M.H. , Zaman H.M.D.K. , Mustofa U.
Published: July 2011

Differential scanning calorimetry (DSC) was used to study the thermal behaviour of abaca fibre reinforced high impact polystyrene (HIPS) composites. Thermal analysis is based upon the detection of changes in the heat content (enthalpy) and the glass transition temperature (Tg) of optimum condition of abaca fibre reinforced HIPS composites. In this research, glass transitions temperature (Tg) of neat HIPS occurred below the Tg of optimum condition of composites as the temperature of an amorphous state. The endothermic peak of composites was in to range 430-435°C including neat HIPS and it observed that enthalpy of abaca fibre reinforced HIPS composites yielded below the neat HIPS 748.79 J/g.
Finite Element Analysis of Interfacial Stress of Mg-Baced Composites Reinforced with Short Fiber
Authors: Li Wei Xue , Du Shu Guang , Dai Jian Feng , Wang Qing
Published: July 2011

In elastic deformation range, this paper reports a finite element study of effect of length and diameter of the fiber on intrfacial stress of AZ91D metal matrix composites reinorced by short fiber. The nuit cell model is developde in ansys. It was found no infuence the fiber length has on the interfacial regions. There is considerable increase in intefacial von-Mises stress near the fiber end with increase in fiber diameter, and the region of stress transfer become wider. So, the risk of crack and debonding increase.
Influence of MgO on Properties and Microstructure of Mullite Ceramics Synthesized from Coal Fly Ash
Authors: Li Jin Hong , Tong Ling Xin , Hou Lei , Shen Jie
Published: July 2011

The effects of MgO and temperature on the properties and microstructure of mullite ceramics synthesized from high-aluminium coal fly ash and bauxite are investigated in this paper. The results show that when the batch containing 4 wt% MgO is heated from 1100 °C to 1500 °C, the bulk density and flexural strength increase obviously with the sintering temperature rising, mullite ceramics with flexural strength as high as 169 MPa can be obtained at 1500 °C with the addition of 2 wt% MgO. According to the XRD results, the corundum, cordierite and cristobalite phases disappear completely upon 1400 °C, it indicates that MgO addition may effectively promote sintering process. The results of SEM indicate that the prepared ceramics mainly exist in the shape of long parallelepipeds with the aspect ratio of about 7-10.
Effects of Mixed RE on Die-Casting Microstructures and Properties of Commercial Mg Alloy
Authors: Li Yao , Yang Jun Jie , Yu Wu Xin , Xue Ping , Zuo Zhi Jiang , Fu Le Rong
Published: July 2011

In this paper, the commercial AZ91 Mg alloy with mixed rare earth (RE) Y、Gd and Nd has been investigated and effects of RE on die-casting microstructure and properties of die-casting Mg alloy has been also explored. The results indicate that RE can effectively refine the grain size of the alloy and improve inner microstructures transforming the reticular structure of Mg17Al12phrase into granular or dotlike structure. At the same time, the amount of the compound at crystal boundary is less than that in the alloy without RE. In addition, the mechanical properties of AZ91 Mg alloy with mixed RE has been improved efficiently, and its tensile strength sbcan reach over 260MPa; its elongation δ can also reach over 4.5％. When the amount of mixed RE exceeds 5%, it will form coarse Al-RE compounds, which can low the mechanical properties of Mg alloy.
Magnetostriction of Epoxy-Bonded Tb0.22Dy0.48Pr0.3(Fe0.9B0.1)1.93 Composites
Authors: Liu Jin Jun , Liu Xiang , Yin Hong Yun , Liu Xin Cai , Si Ping Zhan
Published: July 2011

The magnetostrictive Tb0.22Dy0.48Pr0.3(Fe0.9B0.1)1.93 alloy, and its 0-3 and pseudo 1-3 type epoxy-bonded composites were fabricated by curing without and with a magnetic field. The structural, magnetic and magnetoelastic properties were in investigated by means of x-ray diffraction, an alternating gradient magnetometer and a standard strain technique. The easy magnetization direction (EMD) is lying along <111> direction at room temperature. The 1-3 type composites has a larger magnetostriction than the 0-3 composite has, which can be attributed to the <111>-textured orientation and the chain structure.
Microstructure Refinement in Non-Quenched and Tempered Vanadium-Nitrogen Steel
Authors: Li Hai Bo , Liu Hong Yu , Huang Yu
Published: July 2011

In order to study the effect of second phase precipitation on the refinement of microstructures during static recrystallization, the former researched non-quenched and tempered vanadium-nitrogen steel was chosen to conduct single and double-pass compression experiment by hot deformation simulator and the fraction of static recrystallization at different isothermal times was calculated. The precipitates were analyzed by TEM with accessories of EDS and energy filter. The results showed that precipitates in austenite during the pass isothermal times were mainly the (Ti, V) (C, N) with size varying from 55 to 140 nm, and during cooling and phase transformation were mainly vermicular VC with length in the range of 22-100nm and width 13-39nm. The key factor for refining the final structures: during short isothermal times is static recrystallization; during static recrystallization stagnation plateau is intragranular ferrites nucleated on precipitation phases; after stagnation plateau is intragranular ferrites promoted by the local solute-poor regions.
The Effect of a Light Impurity on the Electronic Structure of Dislocations in NiAl
Authors: Chen Li Qun , Qiu Zheng Chen
Published: July 2011

The effect of light impurities (C, N) upon the electronic structure of the [100](010) edge dislocation core in NiAl single crystals is investigated by using the Dmol and the discrete variational method within the framework of density functional theory. The impurity segregation energy, interatomic energy and charge distribution are calculated, and the effects of impurity atoms upon the dislocation motion are discussed. The energy analysis shows that both C and N atoms can stabilize the [100](010) edge dislocation core, and prefer to occupy the interstitial site in the Center-Ni dislocation core. Meanwhile, the impurity atoms can form strong bonding states with their neighboring host atoms via hybridization between the 2p orbitals of the impurity atom and the 3d4s4p orbitals of the host Ni atoms; as well as between the 2p orbitals of the impurity atom and the 3s3p orbitals of the host Al atoms. The strong interaction between impurity atom and host atoms in the dislocation core may improve the strength of NiAl single crystals.
Theoretical Investigations of the Defect Structure for Ni3+ in ZnO
Authors: Zhang Zhi Hong , Wu Shao Yi , Zhang Shan Xiang
Published: July 2011

The defect structure for Ni3+ in ZnO crystal is theoretically investigated using the perturbation formulas of the spin Hamiltonian parameters for a 3d7 ion in trigonally distorted tetrahedra. In view of the significant covalency of the system due to the high valence state of Ni3+, the ligand orbital and spin-orbit coupling contributions are taken into account in a uniform way based on the cluster approach. The impurity Ni3+ is found not to occupy the ideal Zn2+ site in ZnO but to undergo the small axial displacement of about 0.044 Ǻ away from the oxygen triangle along the C3 axis. The theoretical spin Hamiltonian parameters based on the above impurity displacement show good agreement with the experimental data. The defect structure of this impurity center is compared with that for the similar Fe3+ in ZnO.
Experimental Study on Horizontal Continuous Casting of 6061 Aluminium Alloy Bar Process
Authors: Wang Xiang Jie , Zhang Jiao , Huang Yun Peng , Zhao Zhi Hao , Cui Jian Zhong
Published: July 2011

The aluminium alloy bar is mainly obtained by hot extrusion in the past. In order to increase the production efficiency and reduce the cost, a new mold is designed, and horizontal continuous casting is used to produce the aluminium alloy bar in this work. The results show that aluminium alloy bar can be cast by horizontal continuous casting. The asymmetry of the sump is overcome by optimizing the design of the mold. When the temperature of the melt was 730°C, casting speed is 650 mm/min, cooling water is 15 L/min, the quality of lubricating oil is 0.5 ml/min, and the ingot with good surface quality can be cast.
Optimal Design of 6-UPU Parallel Mechanism
Authors: Wu Guang Hua , Gong Lie Hang , Ji Xin Wei , Wu Zhong Jun , Gai Yong Jun
Published: July 2011

The methodology of the optimal design for the 6-UPU parallel mechanism (PM) is presented based on genetic algorithms. The optimal index which expressed by Jacobian matrix of the PM is first deduced. An optimal model is established, in which the kinematic dexterity of a parallel mechanism is considered as the objective function. The design space, the limiting length of the electric actuators and the limit angles of universal joints are taken as constraints. The real-encoding genetic algorithm is applied to the optimal design of a parallel mechanism, which is proved the validity and advantage for the optimal design of a similar mechanism.
The Schematic Design of Scanning Electron Microscope Sample Stages with the Function of Structural Dynamic Observation
Authors: Liu Ke Gao , Sun Xi Qiang
Published: July 2011

At present, the structural dynamic observation by scanning electron microscope (SEM) has a wide range application in the research and production of materials. In this scheme, the sample stages with the function of stretching, compressing, bending and twisting samples are designed by reforming the construction of scanning electron microscope sample stage. Specifically, the aim of conducting structural dynamic observation is achieved by installing different mechanical clamping devices on the scanning electron microscope sample stage base. Furthermore, the sample stage has simple structure, low lost and practical advantages.
Research on the Key Technology and Application of the Process Monitor Configuration System
Authors: Li Wei
Published: July 2011

Pushed by the country policy about energy conservation, the usage amounts of new wall material promptly increases, the production automation has occupied a decisive position in the development of modern wall material industry. For resolving real problems in the wall material production, a process monitor configuration system is constructed based on the PROFUBUS technology, SIEMENS PLC and WINCC configuration software, some control logic, group control ways and data report patterns are designed and discussed, by which the higher-performance and the lower cost can be realized in the wall material production process.
The Optimization of Automated Stereoscopic Warehouse’s Cargo Space Allocation Based on Hybrid Particle Swarm Algorithm
Authors: Yang Wei , Wang Hai Gang , Qiu Xiao Hong
Published: July 2011

It proposes the decision module which based on the combination of polychromatic set and hybrid particle swarm algorithm. It uses polychromatic set theory to carry on partition to the shelves; the partition of each row of shelves is the same and the number of partitions is the same as the number of type of goods, then it uses particle swarm algorithm to determine the warehousing quantity of each kind of goods in each row of shelves, and finally in each row of shelves, according to the types and quantities of inbound goods, it uses hybrid particle swarm algorithm to carry on specific allocation to warehousing storage space in the corresponding regions, solves the problem of storage location assignment’s optimization, and proves this module’s feasibility and effectiveness through examples.
Design and Implement of a Food Safety Testing Instrument Based on Microcontroller
Authors: Wu Ang , Zhu Juan Hua , Hu Xiao Ning
Published: July 2011

A food safety testing instrument is designed and developed based microcontroller. The instrument includes optical unit, conditioning unit and control and acquisition unit. The optical unit converts the chemiluminescence signals into electrical signals through photoelectric sensor. Conditioning circuit mainly amplifies the weak signal to an appropriate range. Control and data acquisition circuit consists of the MCU, LCD and memory circuit. The experiment shows that the correlation coefficient (R2) between the phosphate ion concentration and emitting area was 0.98. The instrument is small，cheap and reliable. It shows that the instrument can successfully used to quick measurement for food safety in field.
Image Segmentation Using Binary Level Set Method Based on Region-Based GAC Model
Authors: Ren Ge , Cao Xing Qin , Pan Wei Min , Yang Yong
Published: July 2011

A new Region-based GAC (geodesic active contour) model was presented, which is the improvement of traditional GAC model. A new region-based signed pressure forces function was presented, which takes the place of the edge stopping function, and can efficiently solve the problem of segmentation of objects with weak edges or without edges. The model is implemented by level set method with a binary level set function to reduce the expensive computational cost of re-initialization of the traditional level set function. The proposed algorithm has been applied to images of different modalities with promising results, which are better than that of traditional GAC model and C-V model.
The Research and Application of Nuclear Power Valve Steel Casting by CAD / CAE Simulation Design and Refining Technology
Authors: Chen Hai Feng , Cao Feng
Published: July 2011

With China cast CAE / InteCAST, we analyzed the ordinary valve casting parameters of solidification process, flow and heat transfer, and frequency smelting refining furnace used in the process of feeding wire, argon technology in the intermediate. Comparison-ray testing and physical anatomy of the results, we developed nuclear power valve steel casting process parameters. The results showed that the software forecast casting the shrinkage tendency of value; frequency smelting refining controlled sulfur, phosphorus and aluminum content; products fully comply with the ASTM A216/A216M overcome hot cracking defects, improving the casting ability of anti-fatigue.
Fitting Growth Model Using Nonlinear Regression with Random Parameters
Authors: Li Yao Xiang , Jiang Li Chun
Published: July 2011

Mixed Effect models are flexible models to analyze grouped data including longitudinal data, repeated measures data, and multivariate multilevel data. One of the most common applications is nonlinear growth data. The Chapman-Richards model was fitted using nonlinear mixed-effects modeling approach. Nonlinear mixed-effects models involve both fixed effects and random effects. The process of model building for nonlinear mixed-effects models is to determine which parameters should be random effects and which should be purely fixed effects, as well as procedures for determining random effects variance-covariance matrices (e.g. diagonal matrices) to reduce the number of the parameters in the model. Information criterion statistics (AIC, BIC and Likelihood ratio test) are used for comparing different structures of the random effects components. These methods are illustrated using the nonlinear mixed-effects methods in S-Plus software.
Development of a Wireless Sensor Network for Factory Power Monitoring and Automation Control
Authors: Sung Wen Tsai , Hsu Yao Chi , Chen Jui Ho
Published: July 2011

For factory automation, devices and machine make a lot of space has become crowded and full of workers makes the operation of the pipeline space is limited, the problem of accidents become more frequent as the frequency will gradually floating surface have to seriously. The combination of embedded systems based on ZigBee technology to enhance the quality of research objectives of industrial safety, in addition to the general control inherent in using the system outside the ZigBee wireless technology to a remote control. Industrial application platform measurements have the thickness of the degree of screening, vibration sensor, weight classification, current sensing, energy monitoring, load switching, temperature monitoring, and carbon dioxide concentration. From the existing literature found in this study combined with embedded ZigBee for industrial real-time measurement system is an innovative technology. In this study, in addition to the discussion platform, the data for statistical measurement and analysis are also discussed in detail, through wired and wireless synchronization of the system measurement and monitoring, will be able to reach a real-time and can improve the safety of plant safety monitoring.
Research on Optimization of Processing Parameter in Turning Process Based on BP Neural Network and Genetic Algorithm
Authors: Li Bao Dong , Wu Xiao Hong
Published: July 2011

A method of turning process parameter optimization combining neural networks with genetic algorithm was presented.Taking experimental data as samples,the model between processing parameter and processing function was established based on BP neural networks.Counter to various product objectives,processing parameter is optimized by genetic algorithm.When turning by the optimized process parameters, the error of the objective function <1%. It fully played their function which extensive mapping ability of neural networks and rapid global convergence of genetic algorithm.
Simulated Annealing Algorithm and Genetic Algorithm for Optimization Design of Multilayer Optical Thin-Film Coatings
Authors: Zhang Xiao Juan , Qiao Guan Jun
Published: July 2011

The key parameters for Simulated Annealing Algorithm (SAA) and Genetic Algorithm (GA) were determined by test experiments. With optimal parameters obtained for both algorithms, the multilayer antireflection coatings in the 7.7-12.3μm band and a neutral beam splitter in the visible region were designed. Results showed that, for infrared multilayer antireflection coatings, the evaluation function value of SAA was 18.7% lower than that of GA, and the average transmittance of SAA was 0.4% higher than that of GA. Compared to GA, SAA achieved a higher average transmittance and a more flat transmittance curve. And for the neutral beam splitter, the running time of GA was 0.407s less than that of SAA, whereas the convergence effect of SAA was superior to that of GA. Therefore, the design with SAA has certain advantages for both the infrared multilayer antireflection coating and the beam splitter.
Stabilization for a Class of Discrete-Time Switched Linear Singular Systems
Authors: Men Bo , Li Xiao Song , Ou Xin Yuan
Published: July 2011

In this paper, the stabilization problem is studied by using multiple Lyapunov function techniques for a class of discrete-time switched linear singular (DSLS) systems. The existing criteria of stability for continuous-time switched singular systems are extended into DSLS systems. Then, a hybrid switching law is designed based on a partition of state space by using S-procedure method.
Self-Adaptive Illumination Method for Optical Multi-Touch System
Authors: Yang Tao , Li Xiang , Wang Yong Tian , Liu Yue
Published: July 2011

The uneven illumination distribution would affect the accuracy and stability of an optical multi-touch system. In this paper, different self-adaptive methods based on the type of interference source are integrated. When the ambient lighting changes, the luminance of the captured image will changes accordingly. This method tests the type of interference source by the speed and the region of ambient lighting change, and uses different function to update the background image rapidly. Experimental results show that with the help of the presented solutions, the ghost points are efficiently reduced and the system can adapt to the changes of ambient lighting in only 1 second.
Dynamic Characteristics of a Long-Span Cable-Stayed Bridge
Authors: Hui Liu
Published: July 2011

In order to study the dynamic characteristics of a super-long-span cable-stayed bridge which is semi-floating system, the spatial finite element model of this cable-stayed bridge was established in ANSYS based on the finite element theory.Modal solution was conducted using subspace iteration method, and natural frequencies and vibration modes were obtained.The dynamic characteristics of this super-long-span cable-stayed bridge were then analyzed.Results showed that the super-long-span cable-stayed bridge of semi-floating system has long basic cycle, low natural frequencies, dense modes and intercoupling vibration modes.
Empirical Study on the Relevance B between Manufacturing and Logistics Based on Gray Correlation Analysis
Authors: Peng Jian Liang
Published: July 2011

The coordination development between Manufacturing and Logistics is important for a district to ensure its healthy and sustainable development. In this paper on the basis of reviewing the research achievements about the relationship between manufacturing and logistics, constructing an evaluation index system about the relationship between manufacturing and logistics, based on the grey relation analysis, an empirical analysis about the quantitative evaluation of coordinating degree between manufacturing and logistics industry in Hangzhou is given to verify the novel evaluation methodology. The results have realistic significance for the government to provide an important scientific basis.
A Combined Nonlinear PID Control and Cross-Coupled Pre-Compensation Control in Hydraulic Excavator
Authors: Wang Dong Yun , Guan Cheng , Shao Li Ping
Published: July 2011

In position control system of hydraulic excavator, the uncoordinated speeds between joints make quite trajectory errors no matter how well each joint performs. In order to solve this problem, a cross-coupled pre-compensation method is introduced in and applied to hydraulic excavator servo control system to solve this problem. Furthermore, in order to compensate for the nonlinearities of excavator and friction resistance, a nonlinear controller with angle velocity error observer and acceleration feedback is designed. Experimental results show that the proposed control strategy is effective in improving tracking accuracy and response ability when subjected to external load.
WebGIS Intelligent Diagnosis and Forecasting System of Plant Diseases
Authors: Shi Ming Wang , Zhou Yan
Published: July 2011

With the computer and the rapid development of information technology, The plant disease intelligence diagnosis and the plant disease early warning network is possible. In this paper, relying on the Internet, the realization of intelligent online plant disease diagnosis, early warning, prevention and other information query and forecasting capabilities. The database base on Internet-based wide area network environment and the help of webGIS technology, including diagnostic module, check module and the prediction module. The intelligent prognosis is tested to the extent and happening of plant diseases, for example, Wheat, cotton, tomatoes and other 12 kinds of plant diseases, and epidemic curve is given. To disease diagnosis and prediction of the professional, technical problems become easy, for the effective control of plant diseases, provide a reference.
An Binary Discernibility Matrix Attribute Reduction Algorithm on Attribute Importance Heuristic Message
Authors: He Ying , He Dan
Published: July 2011

A binary discernibility matrix attribute reduction algorithm of incomplete decision table is introduced in this paper, which takes the importance of attribute as the heuristic message. To obtain better attribute reduction, this paper constructs a metric formula of attribute importance and gives a binary discernibility matrix to present incomplete decision table. Based on the formula and matrix an attribute reduction algorithm of incomplete decision table is introduced. This algorithm solves the problem of the attribute selection when the frequencies of attributes are equal. The result shows that this method is simple and effective.
Optical and Hydrogen Sensitive Properties of Platinum-Doped Tungsten Oxide Films
Authors: Li Ze Lun , Zhou Chuan De , Tang Yi Ke , Xu Jing , Fang Xiao Hua
Published: July 2011

As a type of the novel semiconductor materials, tungsten oxide (WO3) is applied extensively in recent years for its electrochromic property. It has been widely used in many different applications, such as electrochromic windows, optical devices, fuel cells, gas sensors, and photocatalyst materials, etc. Based on the study on the preparation of platinum-doped WO3 films, we studied the optical and hydrogen sensitive properties of the films. In this work, firstly, the preparation method of the platinum-doped WO3 films was discussed. Secondly, we studied the transmissivity of the films. Thirdly, the restoration and the repeatability of the films was discussed. This work can provide theory support for the design of optic-fiber sensor for hydrogen concentration measurement.