bluuebunny/crossref_metadata_2025 huggingface dataset:
The Optimization Study about Technological Parameters of YAG Laser Precision Cutting Stainless Sheet
Authors: Yin Gui Min , Li Zhan Guo , Li Meng
Published: March 2013

Using high power Nd3+:YAG pulse laser for precision cutting stainless sheet, study the effects of the laser cutting technological parameters on quality of cutting surface and joint-cutting width. The data of single factor experiment proved： With the increasing of scanning velocity, the joint-cutting width decreased; the width increased with the increasing of scanning velocity, laser current, impulse frequency and impulse width; the increasing of impulse frequency may improve the processing quality and ultimate cutting speed; the data of two-factors experiment proved: when the output power and impulse width are fixed, the impulse frequency will be increased, the joint-cutting width will be decreased; when the output power and impulse frequency are fixed, the impulse width will be increased, the joint-cutting width will be decreased.
Preparation of Fe (III) – Amidoximated PAN Nanofibers Complexes for Degradation of Azo Dye under Visible Light Irradiation
Authors: Zhao Xue Ting , Dong Yong Chun , Cheng Bo Wen , Kang Wei Min
Published: March 2013

Polyacrylonitrile (PAN) nanofibers were fabricated via electrospinning technique, and the modified Fe-polyacrylonitrile nanofibers photocatalysts(Fe-AO-n-PAN) were prepared by a reaction between PAN nanofibers (AO-n-PAN) containing amidoxime group and ferric chloride. Then Fe-AO-n-PAN were used as heterogeneous catalysts in the oxidative degradation reaction of C.I. Reactive Red 195(RR195) in water. This paper investigated the influences on the degree of the conversion from nitrile group to amidoxime group (CP%); analyzed the impacts on the Fe (III) ions content (QFe-PAN) in Fe-AO-n-PAN; and studied the effects of QFe-PAN on the decoloration rate of the dye. The results indicated that the CP% value were greatly enhanced not only with concentration of NH2OH•HCl increasing, but also gradually with the prolongation of reaction time. In addition, the QFe-PAN of Fe-AO-n-PAN increases with the rise of CFe and the CP% value. Finally, Fe-AO-n-PAN have remarkable catalytic activity on the degradation of RR 195, and higher QFe-PAN could promote the catalytic performance of Fe-AO-n-PAN.
Die Casting Mold Design of Auto Oil Pump Bracket
Authors: Jiang Yan , Su Yong , Hu Ping , Chen Wen Ping
Published: March 2013

This paper introduces a die-casting mold design process. On the basis of the shape of Car oil pump support, central of castings’ side face was selected as the mold joint; due to the design requirements of pouring system, we chosen bias running system. Castings’ size was calculated by requirement of die casting machine, then accomplished designs of molding and structure’s components. Because through holes which on the side face of castings are not deep, angular pin core puller is competent, at last, the final assembly of the mold and the simulation is completed.
The Analysis of Sedimentary Evolution Mode of Denglouku-Formation in Gulong Area of Songliao Basin
Authors: Zhang Lei , Zhang Xue Juan , Man Yong , Xu Jianjun , Yang Zhi Ru
Published: March 2013

By making use of the datum of seismic, drilling, logging and cores, this thesis conducted a study on the sequence stratigraphic framework and sedimentary characteristics of Denglouku-Formation in Gulong area, and analysed the sedimentary evolution mode of Denglouku Formation in Gulong area. The results show that Denglouku Formation in Gulong area can be divided into one supersequence Ⅰ, four third-order sequences (Sq1-Sq4). The depositional systems developed in Denglouku Formation in Gulong area mainly include alluvial fan, fan delta, sublacustrine fan, fluvial facies, braided river delta, shallow water delta, and lake sediment and so on. The distribution features and sedimentary evolution pattern of depositional systems of each third-order sequence are significant difference. The formations of Sq2 and lower Sq1 are controlled by rift faulting and their characteristics of sedimentary filling conform to the continental faulted basin sedimentary evolution mode. Sq3 and Sq4 formation and upper formation of Sq2 have characteristics of depression sequence stratigraphic. The upper formation of Sq2 and Sq3 formation belong to the "river - shallow delta" sedimentary model of depression basin. And Sq4 formation conforms to the “flood-overlake” model in depression basin in droughty climate.
Sedimentary Characteristics in Zhalainuoer Group in Cano Depression Hailaer Basin
Authors: Yu Ying Hua , Yuan Hong Qi , Guo Zi Xue
Published: March 2013

Based on the theory of sequence stratigraphy, sequence stratigraphy framework of is established in this paper by comprehensively search of core, logging and 3-D seismic data. Zhalainuoer group in Cano Depression is divided into 5 3rd-order sequences: Sq1、Sq2、Sq3、Sq4、Sq5 from down to up. Based on the division and comparison of sequence formation, the sedimentary facies and the depositional system are proposed to study in the paper, and the main depositional systems are detailed explained. The distribution of these depositional systems is controlled by the sequence framework.
Potential Indonesia Ores as Raw Material for Producing Iron Nugget
Authors: Soedarsono Johny Wahyuadi , Kawigraha Adji , Sulamet-Ariobimo Rianti Dewi , Johansyah D. , Kusuma G. D. , Suprayogi Suprayogi , Yosi A. , Saputro N. L. , Sidiq A. T. , Erwin Erwin , Natanael D.
Published: March 2013

Indonesia due its archipelago has so many kinds of rocks which contain ores. With the finding in technology iron source is not iron ore alone like it use to be in the past. This research is conducted to see availability of mineral rocks in Indonesia as iron source. Four different kinds of mineral rocks are used. They are: limonite, saprolite, malachite, and chalcopyrite. Separation of limonite is done by magnetic separation process while saprolite, malachite, and chalcopyrite are done by washing separation methods. Analysis on Fe content is done at origin and roasting condition for all rocks. The results show that other mineral rocks can become iron source, separation will enhance Fe content, and lateritic nickel rocks especially limonite can be new other iron source.
Study on the Effect on Sintering Mineralization of Iron Ore
Authors: Fan Xiao Hui , Li Ying , Chen Xu Ling
Published: March 2013

The main effect on iron ore mineralization performance in the sintering process is the grain size of raw material and chemical composition. The results show that -0.5mm particles can mineralize, but +0.5mm particles remain a nucleus in sinter. This paper analyses the effect of the chemical composition on mineralization characteristics of liquid production. The relationship model is established by using regression analysis between the chemical composition and liquid formation characteristics. The mian factors of mineralization in the chemical composition: SiO2, CaO, MgO and Al2O3.
Experimental Research of Fluorite Flotation Separation
Authors: Nie Yi Miao , Bai Li Mei , Liu Shu Xian
Published: March 2013

Grade of fluorite in this test is 30.95%,containing CaCO3 0.86%. On the base of much experiment research, such as grinding fineness test, pH test, agent dosage test and so on, the optimum conditions were: grinding fineness for first stage is -0.074mm 65%,pH=9, sodium silicate 0.8 kg/t and oleic acid 0.7 kg/t . The result of tests showed that the grade of CaF2 concentrate, recovery and productivity are 95.38%, 63.42% and31.20% by adopting a circuit of one rough flotation and seven concentrating with grinding fineness -0.043mm90.3%.
Preparation and Characterization of Shellac/Polyvinylpyrrolidone Nanofiber as a Material for Medical Application
Authors: Thammachat Thanachod , Tabcharoen Sompoch , Soradech Sitthiphong
Published: March 2013

Nanofiber are defined as diameter less than 1 micron is under development for future medical application. The simple method was used to prepare a nonwoven in nanofiber of shellac (SHL) and polyvinylpyrrolidone (PVP) is electrospinning machine. The objective of the present study was to investigate the effect of electrospinning process on the physical properties. The SHL/ PVP nanofiber was prepared by dissolving in various rations of SHL/PVP in ethanol solution. Properties of obtained SHL/PVP nanofibers were elucidated. The results demonstrated that nanofibers of SHL/PVP were easily formed after spinning with diameter ranging from a few nanometers to several micrometers. SHL and PVP blended fiber could be formed by the hydrogen bonds attributing to the change in physicochemical properties via FT-IR. This study indicated that a simple method to create nanofiber nonwovens of multiple dissimilar composite polymers providing an approach for controlling diameter size distribution independently from fiber formation. Hence, the knowledge gained should support the development of the product for medical application in near future.
A Study on Crystallization of Fused Silica/Zirconia Ceramic Composites
Authors: He Yong Wu , Wang Rui Sheng , Bu Jing Long , Chen Jun Xing , Wang Zhi Fa
Published: March 2013

Fused silica particles and zirconyl chloride were used as main raw material. Meanwhile, ammonia was used as precipitator and polyethylene glycol as dispersant. Firstly, the composite powders were prepared by wet chemical synthesis. Then, fused silica/zirconia ceramic composites containing zirconia with different contents (5%, 15%, 25%, 35% and 45%) were fabricated in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1 h. The thermal expansion ratios and XRD of samples were examined. The analysis of XRD indicated that the cristobalite peaks intensity of sample with more zirconia is lower at the same sintering temperature, and the intensity of cristobalite was higher while sintered at higher temperature. Zircons were found in all samples’ XRD patterns. The results of thermal expansion ratios showed the ratios of samples with more zirconia were lower, especially at higher sintering temperature. So, existence of zirconia can inhibit crystallization of fused silica/zirconia ceramic composites effectively.
The Static Mechanical Properties of Carbon/Epoxy Composite Laminates with Voids
Authors: Zhang A Ying , Zhang Dong Xing
Published: March 2013

The effects of voids on the tensile and compressive properties of CFRP laminates were discussed in this paper. The tensile and compressive strength of specimens decreased with the porosity increasing from 0.33% to 1.50%. The empirical models of the tensile strength and the compressive strength of CFRP laminates with different porosities are established by using ORIGIN software. The evolution laws of the tensile strength and the compressive strength with different porosities were corresponding to the form of exponential function.
Effects of the Content of ZrO2 Nanoparticles on the Microstructure and Properties of Al2O3-TiC-ZrO2 Micro-Nano-Composites
Authors: Liu Wei Min , Zhao Jun , Zhou Yong Hui
Published: March 2013

Al2O3-TiC-ZrO2 micro-nano-composites with addition of ZrO2 nanoparticles were fabricated by vaccum hot pressing with Mo and Ni powders as sintering aids. Results showed that the mechanical properties and relative density of the micro-nano-composites increased firstly and then decreased with the increase in the content of ZrO2 nanoparticles. Al2O3-TiC-ZrO2 micro-nano-composites containing about 4vol% ZrO2 nanoparticles have the highest synthetical properties, its flexural strength, Vicker's hardness, Fracture Toughness and relative density are 920MPa, 20.4GPa, 6.3MPa•m1/2 and 98.9%, respectively. The microstructural characterization revealed that adding proper ZrO2 nanoparticles to the matrix can greatly strengthen the grain boundaries, causing more transgranular fractures and consuming more fracture energy. The excessive amount of ZrO2 nanoparticles may bring about agglomeration effect, leading to the decrease of properties of the micro-nano-composites.
Research on Mullite-Corundum-Aluminium Titanate Composite
Authors: Huang Yuzhou , Bu Jing Long , Chen Yue Jun , Wang Zhi Fa
Published: March 2013

Mullite-aluminium titanate-corundum composite was prepared at 1300°C with refractory clay, aluminium titanate and high alumina grog as raw material, molded at pressure of 50MPa. Effect of raw material ratio on sintering and themal shock resistance of the mullite-aluminium titanate-corundum composite was researched by measurements of apparent porosity, bending strength and residual strength after water-cool, and analyses of XRD and SEM. The results showed that as refractory clay content, apparent porosity of samples decrease, bulk density and bending strength increase. When the weight ratio of refractory clay, aluminium titanate and high alumina grog is 60/10/30, themal shock resistance of sample is excellent, The XRD and SEM analysis results indicated that the mechanical and thermal proprieties are relative to the microstructure and crystal phases of the composite materials.
Preparation and Microwave Absorbing Performance of Co-Cu-Ni Ferrite/Multi-Walled Carbon Nanotubes Composites
Authors: Xiao Qiu Shi , Hao Bin , Li Liang Chao , Mao Meng Yi , Zhou Yan , Xu Feng
Published: March 2013

Co0.6Cu0.16Ni0.24Fe2O4/multi-walled carbon nanotubes composites were synthesized by solution filling method. Phase structure, morphology, function property of the composites were characterized. The experimental results indicate that conductivity was related to the content of MWNTs while the magnetism correlated with the volume of Co0.6Cu0.16Ni0.24Fe2O4 filled in the composites. If setting the iron concentration and sintering temperature as 0.75 mol/L and 350 oC, respectively, the composite with 2 mm of thickness exhibits the excellent absorbing performance on microwave, its minimum reﬂection loss reaches -22.47 dB at 9.76 GHz and the available bandwidth exceeds 2.0 GHz. Hence, the obtained products have the potential and valuable application in microwave shielding and absorption field.
Electrical Properties of Pt Nanowires Deposited with Focused Ion Beam
Authors: Ma Yong Jun
Published: March 2013

Focused ion beam (FIB) is an important tool in microfabrication technique. In recent years, FIB was used to fabricate the nanodevices. In this paper, Pt nanowires with differ radius were deposited with FIB. The component and resistance of nanowires were investigated. Results indicate that the component of Pt naowires is mainly Pt, C and Ga. The high content of Pt in nanowires is 49.36%. The resistivity of Pt nanowire is from 545.74µΩ•cm to 5.16µΩ•cm. Pt nanowires with the diameter up to 60nm take on characteristic of metal; others take on that of semiconductor.
The Preparation and Study of Graphene Supported CoxMn3-XO4 Nanocomposites as Advanced Oxygen Reduction Reaction Electrocatalyst
Authors: Zhao Qiu Ping , Jin Ju Tao , Li Chun Lei , Wang Zheng Min , Zhang Jun Yan , Ma Qin , Cui Jin Feng
Published: March 2013

The spinel CoxMn3-x O4 nanoparticles (SCMN) have been successfully grown on graphene sheets (GS) with a low cost in situ method in diethylene glycol (DEG) solution by using manganese acetate (Mn(OAc)2), cobalt acetate (Co(OAc)2) and graphene oxide as precursors. Excellent electrocatalytic activity and stability for oxygen reduction reaction (ORR) compared with those of commercial 20%Pt on Vulcan XC-72 (20%Pt@C) in alkaline solutions have been obtained.
Bentonite Composite and Fibre
Authors: Chegenizadeh Amin , Nikraz Hamid
Published: March 2013

Composite soils have been widely used in civil engineering applications, especially in slopes, embankment dam and landfills. This paper aims to investigate effect of fiber inclusion on compaction characteristic of composite soil (i.e. clay composite). A series of laboratory tests carried out to evaluate fiber effect on optimum water content and maximum dry unit weight of composite soils. Clay was selected as soil part of the composite and natural fiber was used as reinforcement. The fiber parameters differed from one test to another, as fiber length varied from 10 mm to 20mm and fiber content were selected as 0.1% and 0.25%. For each test, compaction curved derived and the results were compared. The results proved that inclusion of fiber affected compaction behaviour of samples so that increasing in fiber content and length caused increasing in Optimum Moisture Content (OMC) and slightly decreased maximum dry unit weight.
R-ATRP of Acrylamide under the Action of Copper Complex System in Aqueous Two-Phase
Authors: Liu Kai , Cao Ya Feng , Li Yuan , Liu Zhao Li , Tan Feng Zhi
Published: March 2013

Polyacrylamide (PAM) was synthesized by combining reverse atom transfer radical polymerization (R-ATRP) with aqueous two-phase polymerization. In aqueous two-phase system, polyethylene glycol 20000 (PEG20000) is used as dispersing agent, potassium persulfate (KPS) and Cu(en)2+ are used as initiator and control agent, respectively. In this paper the effect of monomer concentration, the amount of Cu(en)2+, reaction temperature, the ratio of Cu(Ⅱ), and ethylenediamine (en) were investigated. The experimental result shows the optimum conditions are as follows: m(AM)∶m(PEG)=1∶1, the monomer concentration is 10%, n(AM)∶n(CuCl2•2H2O)∶n(en)∶n(KPS)=3000∶10∶20∶1, polymerization time is 6 h, and polymerization temperature is 45°C. Under these conditions, the monomer conversion is 91.5%，the linear correlation coefficient is 0.9911.
Preparation and Research of the Multifunctional Heat Stabilizer with Rare Earth Used in PVC Products
Authors: Guo Yu , Zhang Yu Lin , Chen Qian Lin , Fu Cheng Bing
Published: March 2013

In this paper, a new heat stabilizer was prepared, which has shown not only excellence thermal stability, but also shown obvious oxidation resistance and anti-aging properties. This multifunctional heat stabilizer was prepared by organic acid, rare earth and thiourea. The lauric acid as best stuff was chosen from some normal fatty acid and lanthanum nitrate as most potent rare earth was picked up too. Using these raw materials, the best heat stabilizer was synthesized under this conditions of synthesizing at 80°C, reacting 40min, adding 1.0mol/L sodium-hydroxide for keeping PH at 8 and making certain the amount of raw material(lauric acid : thiourea : lanthanum nitrate) at the proportion as 4∶1∶1. The thermal stability was examined by the change time of Congo red, and the result proved this heat stabilizer having good thermal stability for up this time to 40min. When this rare earth stabilizer was joined into PVC, the PVC can keep its color not changing during 48h under ultraviolet radiation, and the tensile strength and elongation at break of the PVC added rare stabilizer changed more little under ultraviolet radiation compared with the traditional heat stabilizer system. So this rare earth heat stabilizer acting as a good heat stabilizer, anti-oxidant and anti-aging agent is a new multifunctional heat stabilizer.
Linear Defect States of Phononic Crystal Thin Plates – An Application of Finite Element Method
Authors: Yao Zong Jian , Yu Gui Lan , Wang Yue Sheng , Hu Wenjun
Published: March 2013

In this paper, propagation of flexural vibration in phononic crystal thin plates with straight, bending or branching linear defects are explored using finite element method. The plate is composed of an array of circular crystalline Al2O3 cylinders embedded periodically in the epoxy matrix with a square lattice. The numerical results showed that accurate band structures and transmission response curves could be obtained by finite element method compared with that of improved plane wave expansion method. The exploration indicated that finite element method is efficient and suitable in dealing with the wave propagation in phononic crystal, and displays potential abilities in dealing with complex structures.
Refractive Index Dispersion and Optical Dielectric Properties of Poly(N-Carbazole)/Poly(vinylpyrrolidone) Blends
Authors: Alias A.N. , Kudin T.I. Tunku , Zabidi Z.M. , Harun M.K. , Marwan Bin Ali Abdul Malik , Yahya Mohamad Faizul
Published: March 2013

Different compositions of blended poly (N-carbazole) (PVK) with polyvinylpyrrolidone (PVP) were prepared. The optical properties such as infinite frequency refractive index (n∞), average oscillator wavelength (λ0), oscillator strength (So), dispersion energy (Ed), oscillator energy (Eo) and optical dielectric loss have been calculated. The refractive index of polymer blending systems significantly changes with the volume composition of PVP and shows a normal dispersion behavior. Mean while, the values of n∞, Ed and Eo increase with the increase of PVP composition. Both of the real and imaginary part of the dielectric constant decrease as the wavelength increase. Thus, it reveals that the polymer composition has influenced the optical properties of the polymer blending system.
Study on Bilayer-Type ZTO Thin Films Prepared by MOCVD
Authors: Xu Ying , Ma Peng Hua , Liu Mo Ning
Published: March 2013

Bilayer-type ZTO thin films were prepared by MOCVD, metal organic chemical vapor deposition. As the films were investigated with UV spectrophotometer, XRD, SEM and other modern research methods, the optics and crystal properties of the ZTO thin films were researched. From the analysis of testing results, visible light transmittance of ZnO/SnO2-type film was superior to SnO2/ZnO-type film, and ternary compound, Zn2SnO4, was found in the two kinds of bilayer-type films. The priority of nucleation should emerged between the (100) crystal plane of ZnO and the (110) crystal plane of SnO2.
A Novel Demultiplexing Photodetector with Integrated Vertical Conical Structure
Authors: Liu Qing , Huang Yong Qing , Duan Xiao Feng , Fan Xin Ye , Ren Xiao Min , Wang Qi , Cai Shi Wei , Zhang Xia
Published: March 2013

A novel demultiplexing photodetector which consists of a filtering cavity and a conical absorption cavity is proposed. The filtering cavity is formed by four coupled （Fabry-Pérot）F-P cavities, which can realize flat-top and steep-edge spectral response. The top mirror of the absorption cavity is designed to be conical, which can increase the times of light reflection. Then the quantum efficiency is improved. Through the theoretical analysis and simulation, the peak quantum efficiency of the photodetector is 88.87% around 1550nm. In addition, this photodetector has good performance in the flat-top and steep-edge spectral response: the 0.5dB bandwidth is 0.4nm , the 3dB bandwidth is 0.56nm and the 20dB bandwidth is 0.98nm.
Preparation and Properties of ZnO@ZnS Nano-Array Core-Shell Structure with Different Concentration of TAA
Authors: Yuan An Dong , Zhang Yue Lu , Yang Wei Guang , Li Ji Rong , Liao Yang , Shi Wei Min , Wang Lin Jun
Published: March 2013

ZnO@ZnS nano-array core-shell structure was synthesized through a solution method using a thioacetamide (TAA) solution in deionized water. The as-synthesized ZnO nano-array and TAA solution were employed to supply zinc and sulfur ions to form the ZnO@ZnS core-shell structures. The properties of the structure were characterized by X-ray diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM) and UV-Vis spectra. The results indicate that ZnO nano-array was coated with ZnS particles. The concentration of TAA solution can affect the diameter, surface roughness and optical properties of the ZnO@ZnS nano-array core-shell structures.
Synthesis of Diaryl Pyrrolones Derivatives as Combretastatin A-4
Authors: Wei Li , Lu Guo Yuan
Published: March 2013

Combretastatins-A4 (CA-4) is a natural product with anticancer activity. However, only the cis-isomer exhibits strong antitubulin activity, but the cis-isomer tends to isomerize to the inactive trans-isomer. Thus, this paper reports that an additional pyrrolidone ring was used to replace the cis double bond to arrest the cis-conformation, and a series of 3,4-diaryl pyrrolediones and 3,4-diaryl pyrrolones as CA-4 analogues were synthesized via a four steps reaction from 3,4-dimethoxyacetophenone and 3-fluoro-4-methoxy acetophenone. The structure of the new compounds was confirmed by 1H NMR, 13C NMR, ESI-MS and elemental analysis. The in vitro activities of CA-4 analogues against HL-60, SMMC-7721 and A549 human cancer cell lines were tested using colorimetric MTT assay and the results indicate that they show significant antitumor activity.
Optimal Design for ASP of Mixed Surfactants with Rhamnoilpid
Authors: Liu Yi Kun , Shen An Qi , Zhu Yu
Published: March 2013

Under the same injection conditions, the compounded system of alkylbenzene sulfonate (ABS) and rhamnoilpid mixed in the proportion of 1:1 has the same effect as ASP (ABS system) on enhanced oil recovery with lower production cost. So the field test of ASP flooding of mixed surfactants with rhamnoilpid was developed the in Nanliuqu 1# injection plant.
Thermal Analysis for Fiber-Reinforced Composites Containing Inhomogeneous Interphase Subjected to a Radial Constraint
Authors: Ning Zhi Hua , Liu Xi Nan
Published: March 2013

This paper presents the thermal analysis on fiber-reinforced composites containing inhomogeneous interphase subjected to a uniform temperature change. Based on the assumption of generalized plane strain, the deformations and thermal stresses of the composites subjected to a radial constraint are obtained by using iterative technique. The material properties of the interphase are assumed to be linear variation along radial direction. The effects of different volume fractions of the interphase on the stresses in the composites subjected to applied radial stress/strain are investigated.
Synthesis and Characterization of Bridged Amine-Functionalized Mesoporous Organosilica Materials
Authors: Zhang Qing He , Lian Dong , Li Xiu Qing , Tao Hong
Published: March 2013

The periodic bridged amine-functionalized mesoporous organosilica (BAFMOs) was synthesized by condensation of bridged silicon precursor 1,2-Bis(triethoxysilyl)-ethane (BTESE) and Bis(3-(methylamino)propyl)-trimethoxysilane (BTMSPMA) under acidic conditions with the aid of NaCl and ethanol. A triblock copolymer P123 was used as template. X-ray diffraction and transmission electron microscopy revealed that the resultant BAFMOs materials possess ordered mesoporous. N2 sorption showed that the specific surface area gradual decreased, from 970m2/g to 795m2/g, whereas the average pore size increased, from 3.7 nm to 5.4 nm as the amount of BTMSPMA increased. 13C CP MAS NMR and 29Si MAS NMR confirmed the retaining of the Si-C as well as the existing of the amino in the silica skeleton. The analytical potential of the materials is demonstrated with separation of isomeric molecules in reverse phase chromatography mode compared with commercial C18 column.
Optimization of Membrane Electrode Assemblies Anode of a Micro Direct Methanol Fuel Cell by Mathematical Modeling
Authors: Suo Chun Guang , Zhang Wen Bin , Wang Hua , Wu Guang Min
Published: March 2013

A direct methanol fuel cell (DMFC) with a novel double-layer structured membrane electrode assembly (MEA) was developed and a better performance was obtained. The double catalytic layer anode is composed of a hydrophilic inner catalyst layer with PtRu black and an outer catalyst layer with PtRu/C. In the double-layer structured anode, there existed a catalyst concentration gradient and porosity gradient, resulting in good mass transfer, proton and electron conducting. Furthermore, the delamination of the catalyst layer from the membrane was also resolved because of the inner hydrophilic catalyst film. To optimize the combination of the two catalysts layer a one-dimensional model based on Tafel type kinetics and semi-empirical mass transport coefficient was applied. The simulation of anode overpotential versus PtRu Blk inner layer thickness and PtRu/C outer layer thickness results showed a direct methanol fuel cell with a 5m thick inner PtRu black catalyst layer and an 8m thick outer 40wt%PtRu/C catalyst layer as anode electrode was the best.
Sheet-Shape Specimen Creep Behavior and Microstructure Analysis of Ni-Based Alloy C276 at High Temperature
Authors: Mao Xue Ping , Zhang Sheng Yuan , Ni Yong Zhong , Wang Xiao , Yu Yang
Published: March 2013

Ni-based Alloy C276 is a candidate material for the fuel cladding of super critical watered reactor (SCWR). In this paper, Alloy C276 was cut to a slice (thickness near to the fuel cladding) to investigate its creep character at 600-750oC with stress 130-240MPa. Scanning electron microscope (SEM) was used to analysis the microstructure of sheet-shape specimens (SS) and bar-shape specimens (BS). The result shows that SS have larger elongation and shorter lifetime than BS. By analyzing SEM images, we can infer that the different exfoliations made the different creep behavior of SS and BS.
Influence of Rare Earth on Microstructure of 20MnCrNi2Mo Wear-Resistant Cast Steel
Authors: Ji Yun Ping , Guo Heng Bin , Zheng Xue Qin , Jin Zi Li , Ren Hui Ping
Published: March 2013

The original austenite grain size, the inclusions and the isothermal annealing microstructure of 20MnCrNi2Mo wear-resistant cast steel without and with Rare Earth were observed by metallographic microscope and QUANTA-400 environmental scanning electronic microscope. The effect mechanism of Rare Earth in 20MnCrNi2Mo wear-resistant cast steel was investigated. The results show that adding Rare Earth in 20MnCrNi2Mo wear-resistant cast steel can refine the original austenite grains. Meanwhile, it can reduce the inclusions size and change the inclusions shape from irregular to nearly spherical. In addition, the Rare Earth in 20MnCrNi2Mo wear-resistant cast steel can increase the amount of ferrite, reduce that of pearlite in the isothermal annealing microstructure and refine the microstructure of pearlite.
Process Design Strategies for Producing Heavy Section Steel with Improved Quality
Authors: Zhao Jing Wei , Jiang Zheng Yi , Wei Dong Bin , Lee Chong Soo
Published: March 2013

Uniformity of microstructure and mechanical properties is required for the heavy section steel. In the present work, a heavy section wind tower flange was manufactured by controlled ring-rolling. Post-rolling heat treatment was employed to optimize the microstructure and mechanical properties. The chemical composition, microstructure and mechanical properties in different zones of the flange were investigated. The results showed that the chemical composition and microstructure were uniformly distributed in the flange. The tensile strength showed similar values in different sampling locations. The strain and impact energies of specimens prepared along the longitudinal direction were higher than that prepared along both the radius and thickness directions. Notch direction did not have noticeable effect on the impact energy. It is demonstrated that the designed process is effective for producing heavy section steel with improved quality.
Multi-Dimensional Global Approximation Method Based Improved MARS
Authors: Luo Xiao Ling , Xue He Ru
Published: March 2013

Global approximation for a complex “black-box” model (like a simulation model) with large domain or multi-dimensions can be applied in many fields such as parameter experiment, sensibility analysis, real-time simulation, and design/control optimization. For multi-dimensional global approximation, MARS (multi-variant adaptive regression splines) has unquestionable predominance over other common-used metamodel techniques. However, MARS has its own inevitable drawbacks which limit the range of its applications. This paper proposes a multi-dimensional global approximation method based improved MARS .Some tests and applications are given to prove the performance of the method.
An Approach of Robotic Kinematics Parameters Calibration
Authors: Zhang Yong Gui , Zhang Heng
Published: March 2013

Aiming at tedious of parameters identification in the process of robot calibration, this paper proposed a method to directly establish parameter error equations based on relative distance error by using the kinematics model in which the parameters error were considered, employing a laser interferometer to measure a 6R robot end-effector displacement distance along its Cartesian coordinates system axis direction, and respectively recorded the joint angle position data to the measured points, then taking all recorded data as basis for the robot kinematics parameter errors identifying equations and employing a hybrid genetic algorithm to solve the equations. The result shown that incomplete distance info can be used to identify kinematics parameters error in robot calibration process.
Design and Dynamic Analysis of Mechanical Fingers Based on ProE
Authors: Gao Jian Wei , Fan Jun Qing , Chen Yang , Yu Yuan Yang
Published: March 2013

Mechanical fingers that imitates human fingers were designed, and kinematic analysis and dynamic analysis of them were conducted. By using bracing wire and expansion bracket, each section of the fingers could bend to 90 degrees, and torque exerted on the finger could be comparatively large. Through theoretical design and simulation analysis, it can obtain the same effect as fingers of an adult when clamping, enclasping and picking up an object.
Analysis and Improvement in Color-Based Target Recognition Algorithm of Robot
Authors: Zhou Dong Bo , Deng Ji Cai , Wang Geng Hui , Deng Qi Xin
Published: March 2013

In the Martial Arts arena contest of robot, Humanoid robot should recognize the target timely and accurately. So robot vision technology becomes a key of the contest. In this paper, target recognition algorithms based on color information are analyzed. According to the results, an improved algorithm based on Table Lookup method is proposed, which aimed to provide more rapidity of computing in real-time control system on the robot. It is shown in illustrative experiment that average 50% time was saved in computing when using the new algorithm instead of traditional algorithms.
Modeling, Design and Static Analysis of Seven Degree of Freedom Articulated Inspection Robot
Authors: Shanmugasundar G. , Sivaramakrishnan R. , Venugopal S.
Published: March 2013

Every robot is developed for a specific task. To ensure the performance of the Robot before it has implemented to practical application it has to be analyzed using software to avoid unwanted wastage of time and capital. This paper presents the design characteristics and static analysis of the seven degree of freedom articulated inspection robot in nuclear environment. CATIA software is utilized to design the mechanical configuration. To validate the design to be safe, ANSYS software is utilized to perform stress and deflection analysis.
Vibration Analysis of Tendon-Based Parallel Robot for Processing
Authors: Tang Ao Fei , Li Yan , Kong Ling Fei , Cheng Xiao Juan
Published: March 2013

The vibration characteristics of the tendon-based parallel robot for processing are presented. Firstly, the free vibration equations of the robot on the stable position and orientation were modeled, and secondly the natural frequencies were deduced from the transformation of principal coordinates into modal coordinates. Next, cutting-force model was introduced and the solutions of the forced vibration equations were obtained from the Runge-Kutta method, where the minimum natural frequency was taken as basis of the time step that was important for computation convergence. Lastly, the algorithm was verified by simulations, also including solution transformation of time domain into frequency domain by Fast Fourier Transformation (FFT). The vibration properties could be manifested clearly by the solutions in frequency domain. The results show that the eccentricity and the mass of the moving platform are the important factors to make system instable in certain excitation frequency.
The Numerical Simulation of Methanol and N-Heptane Dual Fuel Combustion
Authors: Xiong Jun Hua , Wang Hong Fu
Published: March 2013

Several influence for the soot and NOx emission of methanol and n-heptane dual fuel combustion is advised, using homogeneous charge compression ignition model in CHEMKIN-PRO. The calculating results indicate that methanol plays an important role in the course of soot formation, but the effect of methanol is smaller for NOx. With the increase of methanol quantities, the soot formation is reduced and the soot particle diameter is smaller; if the fuel equivalence ratio is small, the influence of methanol is obvious to NOx emission. If the fuel equivalence ratio ≥ 1.0 , the trend of NOx emission changed. With the increase of methanol, NOx emission early increased, and decreased late.
Research on Workspace of Masticatory Bionic Robot Based on the 3/3-RRRS Parallel Manipulator
Authors: Yu Jing Hu , Li Xiao Feng , Zhou Hui , Cao Yi
Published: March 2013

masticatory movement of mankind is a very complicated process of food processing. In order to research the mechanism of masticatory,firstly, a bionic robot must be designed to achieve chin’s multi-degree of freedom motion and chewing. By 3/3-RRRS parallel mechanism driving teeth up and down, it achieved full chewing of food. The study of this article is done in the condition of each given attitude and location of the moving platform, using the method of the three dimensional boundary search for location workspace. Through the research on workspace, it can be used to analyze the change law of workspace, and provide a theoretical basis for chewing bionic robot’s design with specific chewing campaign parameters.
The Design of a New-Style Boat-Shore Goods Delivery Cableway System and Research on Synthesis Movement Performance
Authors: Tan Zhen Dong , Wu Wei Guo , Wang Zhen Tao
Published: March 2013

The new-style boat-shore goods delivery cableway is a delivery device based on a fixed target and the sea floating target, In this paper, toward the system characteristics of the boat - cableway - movement automatic compensation design and shore optimization design of the layout parameters were discussed, the anchor position of supply ships and stability analysis of coupled dynamic analysis of ship-cableway system, and dynamic response of Synthesis movement performance analysis, were brought forward
Study on Weld Seam Tracking System Based on Laser Vision Sensing
Authors: Cao Ming Qiang , Yan Zhi Hong , Song Yong Lun , Chen Zhi Xiang
Published: March 2013

Seam tracking is a basic condition to ensure a fine welding shape. In order to meet this requirement, the researchers have put forward a variety of sensors and some of them have been applied to practice successfully, such as contact sensor, arc sensor and vision sensor. Laser vision sensor has been proven to be one of the most successfully technology for its many advantages. In this paper, based on laser visual sensing technology, a seam tracking system is established with an embedded microcontroller LPC1768. With this system, a real-time tracking algorithm is proposed and the seam tracing process is realized under a smaller error. Finally, the tracking errors resources and their influence have been simulated and analyzed.
Dynamic Character of a Novel Three-Axis Decoupled Compliant Mechanism
Authors: Lin Sheng , Wang Chun
Published: March 2013

A novel three-axis compliant mechanism is presented. Three original constraints are selected from the freedom and constraint complement topology chart. A compliant mechanism with three rotation freedoms is designed. Constraint 2 and Constraint 3 is designed as a whole to improve the precision and natural frequency. The finite element model is established. And the natural frequency and the main vibration mode are obtained. The deformation of the rotation axis is small. The input and output of the compliant mechanism is decoupled.
Effects of Microstructure Types on the Evaporation Efficiency of Electrically Heated Micro Evaporator
Authors: Zhou Shu Zhang , Kong Rui , Pan Min Qiang , Yuan Qiao Xia , Hou Ting Bo
Published: March 2013

In this work, a laminated microstructure-plate electrically heated micro evaporator was proposed. The effects of microstructure types on the evaporation efficiency of electrically heated micro evaporator under different input voltage values and flow rates of water were investigated. It was indicated that the triangular microstructure plate presented the best evaporation efficiency regardless of the change of input voltage and feed flow rate. The nonuniform-distributed microchannel plate presented better evaporation performance than that of uniform-distributed microchannel plate, while the triangular microstructure plate presented higher evaporative performance than that of rectangular microstructure plate.
Research on the Key Technology of Exploiting and Waterflooding in One Well with ESP
Authors: Luo Dai Liang , Qiu Yong Fa , Xie Wei Bing , Dong Guo Qiang
Published: March 2013

The waterflooding development of Oilfield fringe area and scattered blocks are restricted by the existing pipe network design and pipeline transportation distance and so on. In order to improve the development effect of these blocks, by using advantages of ESP including high head, range capacity and mature technology, technology of exploiting and waterflooding in one well with ESP was discussed. Then, some key problems were settled such as sand prevention, sealing, downhole monitoring of process parameters, structure design and so on, and three process schemes were summarized including exploiting the upper layer and waterflooding the lower layer, exploiting the lower layer and waterflooding the upper layer and downhole pressurized injection. The technology proposed by this article has achieved good results proved by field applications. The success of the technology provides an economical and reliable energy supply technology for oilfield development, and has a broad market prospect.
Research of the Brake Pedal Feel on Wire-by-Brake-System
Authors: Zheng Zhu An , Song Chuan Xue , Lin Hui , Peng Si Lun
Published: March 2013

Analysis and comparison with conventional brake systems and brake-by-wire-system with pedal stroke simulator, and the establishment of the pedal stroke simulator model with the AMESim software, joint Matlab/Simulink software to design single neuron adaptive intelligent PID control strategy of the pedal stroke simulator. Through simulation verification draw that this brake-by-wire-systems and the control strategy can achieve the requirements of brake pedal feel of conventional brake systems, and effectively improve comfort during braking.
Fabrication and Performance of a Double-Chamber Serial Piezoelectric Micropump
Authors: Huang Fang Sheng , Kan Jun Wu , Zhang Zhong Hua , Ma Ze Hui , Wang Shu Yun , Cheng Guang Ming
Published: March 2013

A double-chamber PZT micropump with two PZT actuators and three cantilever valves is introduced. When the PZT actuators work in anti-phase, the output performance of the pump is equal to that of two one-chamber pump running in series. Besides, the pump performance depends on the characteristic and geometrical parameters of the PZT actuators. A prototype double-chamber serial micropump is fabricated with the PZT membrane of 0.2mm in thick and 15mm in diameter. The pump was tested with water as the working medium. The testing results show that both the flowrate and backpressure of the micropump with two chambers running are about 1.54 and 1.8 times those with one chamber running, respectively. With two chamber running, the achieved maximum flowrate is up to 3.85ml/min at 50V and 150Hz, and the maximum backpressure is about 34.2kPa at 50V and 180Hz.
Research of Sensorless Drive of Permanent Magnet Synchronous Motor Based on Power Factor Control
Authors: Han Bing , Xu Jian Ying , Qiao Shan
Published: March 2013

For the traditional sensorless vector control systems of permanent magnet synchronous motor, a new sensorless vector control method is proposed based on the power factor control. On the basis of analysis of the mathematical models for the permanent magnet synchronous motor, established a power factor voltage reference frame system. The rotor position and speed is estimated by the control of power factor angle, and then from the point of view of efficiency drive to configure the stator current. This stator current is arranged in the vicinity of the current minimum trajectory. This method not only can control the speed, but also ensure high power factor and high drive efficiency of the permanent magnet synchronous motor. The simulation results proved the effectiveness and feasibility of this control method.
Design of the Power Unit in the Hydraulic Hybrid Vehicle
Authors: Yao Kai , Li Yang , Xing Ke Li
Published: March 2013

In order to reduce the energy consumption and the hydraulic noise, the paper modifies the hydraulic pump/motor and designs a novel high-speed filling valve for the system, which is normally open and large-diameter. The modified pump/motor and the valve constitute the power unit. In the ANSYS/FLUENT the paper simulates numerically the flow field in the high-speed filling valve. By the use of ANSYS/LS-DYNA the paper analyzes the impact stress of the valve core. According to the simulation results, the power unit is optimized. Tests show that the noise decreases significantly in the vehicle utilizing the valve.
The Operating Principle and Experimental Verification of the Hydraulic Electromagnetic Energy-Regenerative Shock Absorber
Authors: Zhang Cheng Cai , Xiong Zhe , Fang Zhi Gang , Guo Xue Xun
Published: March 2013

This paper introduces a new type of shock absorber: hydraulic electromagnetic energy-regenerative shock absorber (HESA), which can simultaneously implement the function of damping vibration and regenerating a portion of dissipated energies generated from passing through the damping hole. A test bench was trial-produced and used to prove the feasibility of the energy-regenerative scheme. The situation that hydraulic motor rotational speed has a sudden change in the energy regenerating process is theoretically analyzed.
Study on NURBS Curve Interpolation Based on before Acceleration/Deceleration with Linear Jerk
Authors: Ji Guo Shun
Published: March 2013

In high speed machining, excessive vibration and shock growing out of acceleration and jerk should be suppressed. Therefore, based on before acceleration/deceleration with linear jerk, a new NURBS curve interpolation was proposed. Interpolation feed and acceleration were planned employing before acceleration/deceleration with linear jerk evolution. During real-time interpolation, the interpolation feed and acceleration were calculated with polynomial fitting method, and with the second-order Taylor expansion, the interpolation parameter was computed. A NURBS curve was interpolated with the proposed method and the one with S curve acceleration/deceleration as comparison. The results indicated the proposed method not only maintain high feed but also reduce the interpolation output acceleration and jerk significantly, and its output jerk evolves along with time linearly. The proposed method can be used to reduce the vibration and shock from the high speed moving parts and improve their smoothness.
The Reformation of Structure to the C5225 Double Column Vertical Lathe
Authors: Zhang Jian Zhong , Liu Yuan Yuan , Xin Ying Ying , Meng Yong Jing , Fang Fang
Published: March 2013

A general universal vertical lathe was studied in this paper which comprises two columns. The lathe can be used for roughing the cylindrical workpiece, end surface of inner hole and the inner and outer cone etc. The lathe structure and hydraulic system were improved on the basis of keeping the basic operating functions. After improvement of the lathe structure, it is more convenient for finding the exact position of the workpiece and the loading capability was improved. Meanwhile, the spindle can work smoothly and precisely. According to the improvement of the hydraulic system of the machine, the level of automation was enhanced and the working ability of the lathe was improved.
Application and Study of CNC Network System Based on DNC
Authors: Liu Yan
Published: March 2013

Three solutions to network CNC machines are introduced. Advantages and disadvantages are compared. Wireless network solution supports a wider range of CNC communications but easy be disturbed. Single port server solution ensure stable signal but hardware cost is high. TCP/IP solution is stable and reliability while most low-end CNCs do not have Ethernet ports. CNC quantity, port type, distance between CNCs and computers, required speed and cost should be considered to choose right solutions.