bluuebunny/crossref_metadata_2025 huggingface dataset:
Fused Silica Ceramics and Composites for Radome Applications
Authors: Miao Xi Geng , Qu Yu Rui , Ghezzo Fabrizia , Fang Xiao Wei , Yue Yu Tao , Zhao Zhi Ya , Liu Ruo Peng
Published: February 2014

The processing methods, strengthening methods, water-proof coating procedures, and some ways to improve the transmission of microwaves have been reviewed in relation to fused silica ceramics and their composites for radome applications. Fused silica ceramics are characterized by a residual porosity (up to 18%), low dielectric constant (3.06-3.32), low loss tangent (0.00053-0.0065), excellent thermal properties, but low mechanical strength (37-65 MPa). To achieve higher mechanical strength and better transmission efficiency, new randome materials would be those engineered composites consisting, for instance, of a dense layer-porous core structure, a continuous fiber reinforcement, a multilayered structure, and/or frequency selective surface (FSS) layer (s)/metamaterials.
Microstructure and Mechanical Properties of Mg-Based Composites Reinforced with TiB2 Particles
Authors: Fang Can Feng , Liu Guang Xu , Meng Ling Gang , Zhang Xing Guo
Published: February 2014

The effects of in-situ TiB2 particle fabricated from Al-Ti-B system via the self-propagating high-temperature synthesis (SHS) reaction technology on microstructure and mechanical properties of Mg-Sn-Zn-Al alloy were investigated. The results indicate that the size of the Mg2Sn and α-Mg+Mg32(Al,Zn)49 phase becomes coarser with the increasing content of Al-Ti-B preform, meanwhile the amount of eutectic α-Mg+Mg32(Al,Zn)49 phase increases too. The addition of Al-Ti-B is favorable toward promoting the strength of composites, but deteriorates elongation. The resulting as-extruded composite material with 4 wt.% Al-Ti-B preform exhibits good overall mechanical properties with an ultimate tensile strength of 291 MPa and an elongation over 2 %.
Effect of Temperature on Fe3O4 Magnetic Nanoparticles Prepared by Coprecipitation Method
Authors: Niu Ji Mei , Zheng Zhi Gang
Published: February 2014

The Fe3O4 magnetic nanoparticles obtained by the aqueous coprecipitation method are characterized systematically using scanning electron microscope, X-ray diffraction and vibrating sample magnetometer. These magnetic nanoparticles are spheric, dispersive, and have average grain size of 50 nm. The size and magnetic properties of Fe3O4 nanoparticles can be tuned by the reaction temperature. All samples exhibit high saturation magnetization (Ms=53.4 emu·g-1) and superparamagnetic behavior with a block temperature (TB) of 215K. These properties make such Fe3O4 magnetic nanoparticles worthy candidates for the magnetic carriers of targeted-drug or gene therapy in future.
Synthesis and Characterization of Nanosized Inorganic-Organic Hybrid between Phosphotungstic Acid and Rhodamine 6G
Authors: Ren Yan Bin , Chen Lin , Pan Hong Cheng
Published: February 2014

inorganicorganic hybrid nanoparticles between phosphotungstic acid (PTA) and rhodamine 6G (R6G) were synthesized by mixing a solution of 0.1 mmol R6G in ethanol (40 mL) and 40 mL of aqueous solution of PTA (0.2 g). The as-prepared PTA-R6G nanoparticles were characterized by scanning electron microscopy (SEM), UV-vis spectra, and Fourier transform-infrared (FT-IR) spectra. The SEM studies show that the PTA-R6G nanoparticles have an average diameter of about 111 nm and the atomic ratio of W to P is 12.7:1, near to the chemical stoichiometry of PTA. UV-vis spectra confirm that the R6G aggregates formed in PTA-R6G nanoparticles are J-type. The Keggin structure of PTA is maintained in the PTA-R6G hybrid nanoparticles, as demonstrated by FT-IR.
Research on New Technology to Prepare Magnesium Hydroxide from Magnesium Sulphate
Authors: You Long , Qiao Qian
Published: February 2014

This work took Magnesium Sulfate (MgSO4) as raw material to research the influence of different surfactants and the concentration of the same surfactants on the final morphology of Magnesium Hydroxide (Mg(OH)2) in one-step synthesis process. And the analysis and characterization of the products by particle size analyzer and etc were also conducted. The research demonstrated that the polyethylene glycol would be the best surfactant, the optimum value for surfactant would be 3% of the obtained Mg(OH)2, and the optimum temperature water bath would be 50°C. With the above optimized condition parameters, the nanoscale Mg(OH)2procucts with flake morphology, high pure and well dispersion were obtained.
Analysis on the Crystallographic Orientation of Micro-Area under High Magnetic Field
Authors: Meng Lan , Zhou Xiao Ling , Chen Jian Hao
Published: February 2014

The effects of high magnetic field (HMF) of 8T and 12T on the crystallographic orientation of magnetic-induced pearlite (MIP) in silicon manganese cast steel had been investigated by Electron Backscattered Diffraction (EBSD) technique.The results showthat the differences of magnetic moment 、magnetocrystalline anisotropy and magnetostriction between the parent and productwith the application of the external HMF,lead to the obvious preferred orientation during the grain nucleation and growth at the early stage of phase transformation.with 8T,the nucleation and growth of local ferrite(F) mainly is along with the field direction,namely<100>-oriented;While the intensity of HMF is up to 12T, the grains with the <100>-oriented growth are not strengthened consistently along the field direction , but the <110>-oriented.
Study the Coupled-Cavity Waveguides Photonic Crystal Power Splitter
Authors: Chen Yan Bin , Xu Xu Ming , Li Wei
Published: February 2014

We propose a photonic crystal power splitter that allows the electromagnetic waves with a phase shift of 1800between output signals. The splitter consists of two parallel coupled-cavity waveguides placed in proximity. On the basis of the guided mode propagation analysis method, the self-imaging effect is discussed for the case of symmetric incidence. The finite-difference time-domain method is used to simulate the propagation of the beam and experimentally demonstrated. The results show that both output paths have the same physical length, the two output signals are synchronized. The splitter is very attractive for splitting high-speed optical signals in integrated optical circuits.
Hydrothermal Synthesis and Electrochemical Performance of LiFePO4/Graphene Composites for Lithium-Ion Batteries
Authors: Lei Xing Ling , Zhang Hai Yan , Chen Yi Ming , Wang Wen Guang , Huang Zi Dong , Ye Yi Peng
Published: February 2014

LiFePO4/graphene composites were prepared via a simple hydrothermal method. The as-prepared LiFePO4/graphene composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. The lithium-ion batteries using LiFePO4/graphene composites as cathode material exhibited a discharge capacity of 165 mAh/g, which was 97% of the theoretical capacity of 170 mAh/g.
Bethe Approximation in the Theory of "Average Spin"
Authors: Afremov Leonid L. , Petrov Aleksandr
Published: February 2014

The modeling study of magnetic phase transition with account of short-range order has been carried out in the approximation of random interaction between atomic magnetic moments of the nearest neighbours and in the frame of Ising model. Curie temperature has been calculated for different kinds of crystalline lattice.
Antioxidant Activity of Sorbus sibirica Fruit Extracts
Authors: Wei Jie , Shi Jia , Gao Jun , Zhou Zhi Quan , Fan Jun Gang
Published: February 2014

Sorbus sibirica fruits, popularly consumed as tea, is believed to promote healthy, relieve a cough. The literature reporting pharmacological studies related to Sorbus sibirica is very limited. Thus, The antioxidant activities of extracts from Sorbus sibirica fruits were evaluated using various in vitro assays including total flavonoid contents, total antioxidant activity, reducing power, lipid peroxidation inhibitory activity, scavenging hydroxyl and superoxide anion free radicals activity, and protective effects against DNA and protein damages. We selected the process of ultrasound-assisted extraction for total flavonoids from Sorbus sibirica fruits according to the extraction rate of total flavonoids. Results showed that the content of total flavonoids was 0.82 g per 100 g dry fruits sample obtained with ultrasound-assisted extraction method. The extracts exhibited strong scavenging capability with respect to hydroxyl and superoxide anion free radicals, and effectively inhibited the lipid peroxidation of polyunsaturated fatty acids. They also had good reducing power and protection against DNA and protein damage. Therefore, they might offer an important source of effective natural antioxidants in the food and cosmetic industries.
Hydrophilic Mechanism of Sunflower Leaves and Simulation Research
Authors: Wang Qing Cheng , Yang Xiao Dong , Shang Guang Rui
Published: February 2014

This paper studied wettability of sunflower leaves, contact angle of sunflower leaves were measured through the contact angle measuring instrument, which was 43.6°. Microstructure of sunflower leaves were observed by scanning electron microscopy, It found that sunflower leaves is micro and nanostructures covered some needle-like spikes, this feature has an important influence on its hydrophilicity. Through Matlab software hydrophilic mechanism of sunflower leaves was carried out the simulation study, roughness factor γ and area ratio plays an important role to its wettability, which can increase hydrophilicity of the solid surface.
Characterization of Thermal Reversible Cross-Linking Agents for Flexible Poly(vinyl chloride)
Authors: Wang Jing , Fang Wei , Yuan Yuan , Liu Xiao Ming
Published: February 2014

In order to improve thermal stability of Poly (Vinyl Chloride), a kind of thermal reversible cross-linking agents, the end cyclopentadienyl ethanethiol salts, sodium cyclopentadienyl ethyl mercaptan (CPD-C2H4SNa) was synthesized in this paper. The DSC results proved that the prepared CPD-C2H4SNa has obvious thermal reversible characteristics and the thermal reversible temperature was at 177 °C. The effects of cross-linking agent amount, cross-linking reactive time and temperature on flexible PVC compounds were evaluated through gel content testing. It was showed that the cross-linking agent with 3 Phr is optimum for PVC compounds. Moreover, both the cross-linking reactive time and temperature has effects on gel content of PVC compounds. The gel content of CPD-C2H4SNa cross-linked PVC compounds reaches maximum at 76% for 20 min at 160 °C.The static thermal stability of flexible PVC was measured according to congo red method. The results showed that the thermal stability of PVC compounds was enhanced with increasing cross-linking agent amount.
Hydrolytic Activity of a Neodymium(III) Complex in DNA Cleavage
Authors: Cai Shu Lan , Feng Fa Mei , Qiao Kang Quan , Zhang Ying , Zhang Xiu Lan
Published: February 2014

A azamacrocyclic compound with carboxyl branch, 5,5,7,12,12,1-hexamethy-1,4 ,8,11-tetraazacyclo- tetradecane-N/-acetic acid(L), and its neodymium complex ware synthesized and characterized. The mode of combination of the neodymium complex with DNA was investigated by UV-vis absorption spectroscopy methods. The cutting function of the neodymium complex to supercoiled DNA was studied by gel electrophoresis method. The results show that metal complex can bind to the phosphate of DNA double helix and promote the hydrolysis of phosphodiester bond of supercoiled DNA(Form I); Supercoiled form DNA was transformed into nicked form DNA(Form II) with strong cutting effect of the macrocyclic neodymium complex; the reaction of DNA cut is completed by a hydrolysis mechanism.
Growth of Near-Stoichiometric Lithium Tantalite Crystal and its Optical Characterization
Authors: Meng Fan Wei , Xu Bin , Tian Qing
Published: February 2014

Near-stoichiometric lithium tantalite (LiTaO3) crystals were grown by the top-seed solution pulling method in congruent melt with the addition of K2O. The crystals were characterized by measurement of the ultraviolet absorption edge, ability of photo-damage resistance, and the domain structure analysis. Compared with the congruent crystal shows that, the ultraviolet absorption edge of the near-stoichiometric crystals has a blue shift towards a shorter wavelength and curie temperature is also improved; the domain structure of near-stoichiometric LiTaO3 crystals is hexagonal; and the photo-damage resistance of the crystals is greatly improved.
One-Bath One-Step Dyeing Process of Reactive Dyes to Cotton/Hemp Fabric
Authors: Liu Jin Fa , Zeng Xian Ping
Published: February 2014

Cotton fabric and hemp fabric belong to the natural cellulose fibers, different in molecular structures and fiber properties, but similar to the main chemical properties.Mechanism of their reactive dyes are the same, dyeing property and rate are similar.Therefore cotton/hemp fabric using one-bath one-step dyeing with reactive dyes can shorten the dyeing process, technology is feasible to achieve.
Preparation of the Lithographic Printing Ink Cleaning Solution in Plateaus
Authors: Wang Yu , Liao Yang , Mo Li Xin , Li Ya Ling
Published: February 2014

A method to make a kind of printing ink cleaning solution is studied in plateaus. At present, any applicable lithographic printing ink cleaner solution can wash the ink in plains, but not applicable in plateaus which are under low pressures. A kind of lithographic printing cleaning solution is made in this paper, which can solve the problem of volatilizing fast and being not clear. The solution we made have a good cleaning effects, which will not make ink rollers transformed, and not have any injury to PS plate. It will satisfy the condition under the climate of plateaus.
A Novel Iron Oxidation Process in Zinc Leaching Solution by Ozone
Authors: Jing Qian Kun , Liu Xing Yu , Wen Jian Kang
Published: February 2014

In the zinc hydrometallurgy process, iron is usually present in leach solutions and its elimination is a major operational problem. The first step of iron removal is iron oxidation by MnO2, but this process have some disadvantages such as the cost is relatively high and decreased the current efficiency in the electro-winning stage. In this paper, a new iron oxidation process in zinc leaching solution by ozone oxidation was conducted and evaluated. The results showed that Fe2+ concentration decreased from 7.45 g/L to 0.51 g/L in 80min at pH 3. Oxidation of Fe2+ by O3 is controlled by chemical reaction. O3 dissolve rate, pH and initial iron concentration are key parameters for this process. Our finding indicated the potential application of O3 oxidation in iron removal process of zinc hydrometallurgy.
Research on Electrochemical Polymerization of Conductive Heteroaromatic Polymers
Authors: Wu Yao Qing , Zhang Feng Lei , Chen Qi Fan , Gong Sheng Chen , Du Chun Lin
Published: February 2014

Electrochemical polymerization is an effective method for the preparation of conductive polymer materials. BFEE solutions are used in preparation of various high-performance conductive heteroaromatic polymers materials as mixed electrolytes, and BFEE can effectively reduce the oxidation potential of monomer. This paper reviews the research on electrochemical polymerization of heteroaromatic polymers with BFEE mixed electrolyte solution in recent years, and prospects the further development direction and application of the electrochemical polymerization of heteroaromatic polymers.
Study on Synthesis of Ester of Citric Acid and Palmityl Alcohol
Authors: Wang Xiao Hui , Du Xi Hua , Dong Li Min
Published: February 2014

Esters of Citric acid and palmityl alcohol were synthesized by esterification reaction under catalysis of cation exchange resin and P-toluene sulfonic acid respectively. The effects of amount of catalyst, ratio of raw materials, reaction time and temperature on the synthesis reaction were investigated . The experimental results showed that optimum of process conditions were 1:1~1:1.5 molar ratio of citric acid and palmityl alcohol, reaction temperature of 130~140°C, reaction time of 2 h. Conversion of palmityl alcohol were all more than 90% under 0.3% dosage using p-toluene sulfonic acid as the catalyst, or 0.5% dosage using 721 cation exchange resin with sulfonic acid type as catalyst. The synthesized product had good surface activity.
Synthesis and Application of Fluorosilicone Polymer
Authors: Cheng Xi Tao , Li Wen Hong , Zhang Cun She , Bai Yan
Published: February 2014

The structure, properties, synthesis methods and application of siloxane fluorinated polyacrylate polymers,side chain fluorinated silicone polymer and fluoro-silicone block copolymers are discussed. Fluorosilicone polymers has excellent physical property such as low and high temperature resistance, hydrophobic oleophobic property, lubricity etc. It is an advanced material.
Designing of In Situ FTIR Cell and its Application
Authors: Luo Ming Jian , Hu Bing , Liu Xin Yue
Published: February 2014

An easy-operation in-situ FTIR cell is designed and used for the investigation of dehydroxylation and pyridine adsorption FTIR study. The dehydroxylation FTIR spectra of MCM-41 indicate that the isolated, geminal, and oxygen perturbed silanol vibrated at about 3745, 3735 and 3520 cm-1, respectively. Py-FTIR spectra indicate that MCM-41 has none Lewis and Brönsted acid sites while the acid amount and acid strength of AlMCM-41 increase with the decrease of Si/Al.
Co-Electrodeposition and Characterization of Ag-Ag2S-PbS Thin Films on Indium-Tin-Oxide Coated Glass
Authors: Zhang Yuan Ming , Chen Lin , Pan Hong Cheng
Published: February 2014

The Ag-Ag2S-PbS thin films were co-electrodeposited on indium-tin-oxide (ITO) coated glass substrates from aqueous solutions containing 0.01 M AgNO3, 0.01 M Pb (NO3)2, 0.1 M Na2S2O3, 0.02 M ethylenediaminetetraacetic acid disodium salt, and 0.5 M Na2SO4. X-ray diffraction (XRD), scanning electron microscopy (SEM), and cyclic voltammetry (CV) were used to investigate the Ag-Ag2S-PbS thin films. The X-ray diffraction analysis demonstrated the presence of cubic structure of metallic silver, acanthite Ag2S, and cubic PbS, which is consistent with the CV analysis. The effect of different Ag+/Pb2+ratios on the morphology and composition of the Ag-Ag2S-PbS thin films were also studied.
Experimental and Simulation Study of Magnetron Sputtering MgO Film Thickness Distribution
Authors: Han Ya Ping , Feng Jing Yan , Fu Qiang , Zeng Fan Da , Wang Guan
Published: February 2014

A physical model of magnetron sputtering process was built, the distribution of MgO film thickness on the substrate was deduced, and the data were analyzed by using the Matlab. nanosized MgO thin film was prepared on Si substrate by magnetron sputtering. SGC-10 was used to measure the thickness of MgO thin film. The results of experiment correspond fairly well with the theory. Both experiment and the theory show that the distribution of the film thickness on the substrate is uneven and it is also influenced by the radius as well as the distance between the target and substrate. The physical model provides a theoretical basis for evaluation and estimation of the film thickness.
Study of Atmospheric Pressure Plasma Jet on Surface Modification of Polyimide Film
Authors: Peng Shi , Li Wei , Xu Yu , Wang Chao Liang , Guo Ying , Shi Jian Jun , Zhang Jing
Published: February 2014

Polyimide (PI) has good mechanical properties, heat resistance and low temperature performance, and thus shares a wide range of applications. Atmospheric pressure plasma jet was designed for polyimide films surface modification in this paper. The impacts of exposure time and gas ratio on the film surface morphology and property were studied. Scanning Electron Microscope (SEM) results prove that the treated film surface becomes rough and the contact angle decreases rapidly with exposing to plasma. The contact angle did not decrease anymore after extending plasma exposing time to 20 seconds Moreover the intensity of C=O absorption band increases as shown in the Fourier transform infrared spectroscopy (FTIR).
First Evaluations on Structural Response of FRP Pultruded Applications Subjected to Seismic Actions
Authors: Boscato Giosuè
Published: February 2014

The present work proposes and analyses the solution for seismic behaviour of GFRP (Glass Fiber Reinforced Polymers) applications to evaluate the performances respect to dynamic actions considering the global effect on historical structures. The good strength-self-weight relationship defines the GFRP pultruded profile as an efficacious and innovative solution for structural rehabilitation of historical buildings. The composite material with polymeric matrix, FRP (Fiber Reinforced Polymers), is widely used in civil engineering as sheets, bars and strips. Recently a new technology was adopted to improve the structural response with limited increment of dead load with reversible and independent solution.
Structural Performance of a New Column’s Prototype Made by FRP Pultruded Material and Light Concrete
Authors: Boscato Giosuè
Published: February 2014

This investigation presents some evaluation based on the experimental and numerical results obtained on the compression bearing capacity of new columns prototype made by FRP (Fibre Reinforced Polymer) material and concrete. In detail that is the junction due to the assembly between hollow FRP profiles made by pultrusion process with glass fibres and thermosetting matrix vinylestere, and very light concrete casting inside. To better understand the eventually influence related to the hollow shape employed, the study consider both the case of circular and square profile. Due to the novel of the research, a not negligible part of the research is dedicated to test previous the separate material, that is the plane concrete and the hollow GFRP profile, and then the prototype (concrete+GFRP) also considering two different way of load application. Particularly we applied in the first case the load to only the core of the sample, on the plane concrete, and then to the total cross section. This choice allows to evaluate the role and the influence of the bond strength along the length of each sample.
Test Study on Mechanical Performance of the Flexible Connections of the Precast Concrete Wall Panel
Authors: Liu Ruo Nan , Zhang Kai Yin , Tao Meng Lan
Published: February 2014

To explore the performance of the flexible nodes between the precast concrete wall panel and the frame structure, a steel truss is used as an analogue of the frame structure to develop a test. In the test, one precast concrete wall panel was installed on the steel truss, and the connection nodes are designed to be able to slip vertically. Different horizontal forces were exerted on the steel truss to form certain drifts, and the deformation of panel and the slipping performance of the connection nodes were explored. It is found that precast concrete wall panel wont deform under the influence of the drifts, while the connection nodes between the frame structure and the panel were found to slip. The results show that the design of slipping connection node has enough reliability.
Road Performance Study on Gap-Graded and Dense-Graded of Rubber Powder Particles Modified Asphalt Mixture
Authors: Mao Yu , Liu Yang , Hao Pei Wen , Wang Hai Nian
Published: February 2014

A new type of rubber powder particle modifier can be produced by adding some performance improvement additives into the normal 40-60 mesh rubber powder and re-granulation, it proved to have better performances and less airborne dust, mixing well with base asphalt. Researching the performance indicators of rubber powder particles modified asphalt under different process parameters through the adjustment of shear temperature, shear rate, shear time and dosage of rubber powder in the process of producing rubber powder particles modified asphalt, the optimal process parameters was determined, and the road performance indicators of the modified asphalt mixture has been verified.
Jet Stabilities in the Electrospraying of Macro-Molecules Solutions for Controllable Micro-Printing
Authors: Tan Zhi Kai , Xie Zhen Hua , Wang Hong Jie , Liu Bin , Tong Chun Yi , Tan Yong Jun
Published: February 2014

Electrospraying (ES) is of great interest in research for its finely controlled delivery of biomaterials. This study investigated mechanisms involved in the electrospraying of biological macro-molecules which may cause spraying instabilities. Hyaluronan (HA) solutions with concentrations ranging from 1 to 5 w/v % (w in g and v in 100 ml) were prepared for spraying trials using nozzles with a size of 30 μm. In electrifying HA solutions with a high molecular weight of 2.1 MDa, controllable jets can be achieved only at the lowest concentration of 1 w/v %. Generally, further use of a sonication method to reduce the molecular size, stable cone jets can be performed relatively easily than using HA solutions of higher concentrations. The improvement of spray stabilities can be attributed to the reduction in viscosity of the solutions after the sonication. Steady micro-sized jets were observed during the ES process and the jet size was found to increase with the increase of both the molecular size and the concentration. Both parameters can be directly ascribed to the rheological property of the solutions. Results show that a suitable viscosity is critically important in stabilizing the electrospray of macro-molecules. A concentration reduction of HA molecules also happens during electrospraying, which indicates that there is a partial reflection of macro-molecules inside the Taylor-cone with the fluid motions during the spraying process. This partial reflection process is affected by molecular sizes, solution concentrations and spraying time.
A Study on Multi-Focus Images Fusion Technology Based on Fiber Natural Boundaries
Authors: Xu Xin , Wang Rong Wu
Published: February 2014

It is difficult to capture a completely clear image of nonwoven web which is thicker than the depth of field of a light microscope. This phenomenon will leads to the data loss and the test error. In this paper, a region-based image fusion algorithm based on fibers natural boundaries was proposed. First, the one-pixel-wide boundaries were extracted from the point-based image fusion process. Then, the image fusion regions were formed by the sharpness diffusion from the source points which have the highest sharpness at local gradient within the boundaries of fibers. Finally, a fused clear image of the nonwoven web was constructed by replacing the regions with the corresponding regions which have the highest sharpness gradient from the series images at different focus positions of the light microscope.
Adhesion Model and Shedding Limit's Identification of the Oxide Film on the Surface of ELID Grinding Wheel
Authors: Kuai Ji Cai
Published: February 2014

The adhesion property of oxide film has great effects on the grinding quality and efficiency of ELID grinding. In this paper, adhesion strength model of oxide film is established, ELID grinding is conducted to nanometric cemented carbide and ordinary cemented carbide, ELID grinding force is measured, adhesive stress is calculated and the correctness of adhesion model is verified. The results show that the adhesion strength of oxide film is relatively greater, the transition from γ-Fe2O3to α-Fe2O3in the oxide film is relatively fuller and the polishing performance is relatively better while the grinding depth is smaller; with the deepening of grinding, the adhesion strength of oxide film reduces, the composition of the oxide film that transforms into α-Fe2O3is less and the polishing ability reduces. The adhesion model of oxide film well reflects the adhesion property of oxide film, and the application of this model can represent the distribution, shedding and updating of the oxide film on the surface of grinding wheel.
Grinding Model of Processing Aspheric Parts by Bending Method
Authors: Shang Chun Min , Zhang Dong Mei , Yang Jian Dong
Published: February 2014

A new method of processing optical aspheric parts by of bending and forming is presented, and the processing is line contact. The grinding principle is given of the bending and forming method. Based on the Preston equation, the grinding conditions is put forward to the bending and forming method. The function of the pressure and the relative velocity on the any point of at the processing surface are made. The material removal function is deduced about the bending and forming method. The experiments shows the grinding average error is 0.0272mm using solid abrasive on parabolic parts, and the maximum error is 1.0038μm using abrasive belt on hyperboloid parts.
Research on Wear Mechanism in High-Speed Milling GH4169 with Coated Carbide Tool
Authors: Liu Wei Wei , Chen Hao , Li Feng
Published: February 2014

This paper mainly discussed the problems that the serious tool wear,the short tool life of difficult-to-machine nickel base superalloys GH4169,the experiment was processed to obtain the tool wear morphology of GH4169 with a new developed PVD-TiAlN coated carbide tool.The morphology of tool wear was observed by scanning electron microscopy (SEM),and element distribution of tool surface was analyzed by energy spectrum analyzer (EDS),And then through the above two aspects,analyses the main tool wear mechanism.The results show that the mainly wear patterns of coated tool are micro-chipping, micro-cracks and flaking in high speed milling GH4169 with TiAlN coated tool.The tool wear mechanisms are mainly abrasive wear, adhesive wear, diffusion wear and oxidation wear.
The Development of the Microwave Assisted Rock Breaking Device
Authors: Feng Guang Tong , Wang Zong Gang , Wei Zhen
Published: February 2014

Microwave crag broken is a thermal assisted rock breaking method which could melt rocks. Microwave assisted rock breaking method will not bring new impact, wear and tear, instead, the microwave pretreatment on the rock reduces the difficulty of breaking rock and prolongs the service life of the drill bit. This microwave generator accumulates the microwave near the hot spot to soften and melt the rock through generating and transmitting the microwave. And we had experimented with the microwave generator to penetrate the wood, and weaken the strength of the rock. And the experiment proved the scheme of the microwave assisted rock breaking through microwave near field energy and the thermal runaway effect is feasible.
FE Analysis of Hot Strips’ Temperature Distribution in Laminar Cooling Process
Authors: Zheng Yu Qing , Cui Jing Yu
Published: February 2014

The temperature distribution of the hot-rolled strip in the ROT cooling process was calculated and analyzed using ABAQUS in this paper. The complicated heat transfer coefficients of hot strip considering the position effects of top and bottom nozzles, and the non-uniform heat transfer situation along the width direction were defined by user subroutine. The simulation results were in good correlation with test results. It’s helpful for further analysis to improve the temperature distribution uniformity and the simulation accuracy for FE model, and guide the on-site production.
Study on Lateral Pressure-Transfer Regularity of Tube SGMF under High Pressure
Authors: Wu Li Jun , Zhao Chang Cai , Cao Miao Yan
Published: February 2014

The mechanical model of Tube Solid Granules Medium Forming (SGMF) is simplified to three pressure-transfer models: uniform pressure model, unequal diameter model and tube SGMF model. Combining the conclusions of the SGMF investigation and the theories of powder mechanics, lateral pressure-transfer regularity of SGMF under high pressure has been investigated and the mathematical formulas of pressure distribution have been obtained. According to the theoretical analysis, the lateral pressure and the depth of solid granules can be expressed by a segmented function. An experimental set-up has been designed and manufactured to evaluate the theoretical results, good correlation has been observed between the theoretical results and the experimental data.
Research on Impact Fracture and Microstructure of 40Cr Steel under Different Tempering Conditions
Authors: Xiao Yi Qiang , Liu Sheng Xu , Kang Ming Long , Zeng Jian Min , Wang Guo An , Meng Qiu Hong , Deng Ying Zhang
Published: February 2014

As one of the quenched and tempered steels, 40Cr steel is often used to manufacture the shaft in heavy-duty trucks. To adjust the working environment of the heavy-duty machines, 40Cr steel should have high impact property. In this study, different tempering cooling mediums were treated as critical influence on improving impact property of the steel. After heated under 520°C tempering temperature, the samples of 40Cr were cooled in air, oil and water, respectively. The experiments were carried out through charpy impact, metallographical and SEM analysis. The results has shown that 40Cr steel of high impact property and fine microstructure can be obtained when water is used for the tempering cooling medium.
Least Squares – Boundary Element Method of Calculating Minimum Anisotropic Stress and Displacement
Authors: Zhang Wei
Published: February 2014

The boundary element method , combined with the least squares method is proposed to determine the anisotropic elastic plane Laurent series of coefficients a boundary element method of least squares . This method sets the boundary element method and Laurent series method is a long one, not only high accuracy, while access to the plane problem abundance analytical solutions to the infinite domain oval hole of stress concentration problems as an example, the results of the calculation results with the analytical solution compared to illustrate the method is to solve the proble of elastic plane an effective way .
Study on Sinter Microhardness of WISCO
Authors: Wang Su Ping , Bi Xue Gong , Weng De Ming
Published: February 2014

Microhardness of various minerals in sinter was tested in order to better production of sinter with high microhardness minerals in WISCO. The results showed that the hematite microhardness was highest and the glass phase microhardness was lowest, the various minerals microhardness from highest to lowest was: hematitecalcium ferritemagnetiteglass phase. So the hematite and calcium ferrite should be development, and the glass phase should be inhabited in sinter on production. Minerals microhardness was connected with component elements and crystalline structure of the minerals besides ferrous content of sinter.
Study on the Influence of Deformation of the Slipper of Axial Piston Pump under High Pressure on Oil Film Structure
Authors: Wu Huai Chao , Yu Yun Liu
Published: February 2014

The stress and strain of the slipper of 35 MPa high pressure axial piston pump are analyzed by the finite element analysis method, and the following facts are revealed: in spite of the fact that the slipper can satisfy the use requirement in the aspect of stress, whereas, in the aspect of strain, the deformation of the bottom of the slipper increases with the pressure increase, and the deformation of the slipper has reached the order of magnitude of the oil film thickness under 35 MPa working pressure. Therefore, when the slipper pair of 35 MPa high pressure axial piston pump is designed and its oil film performances are studied, the influence of deformation of the slipper on the oil film structure must be considered comprehensively. The results of this study can provide some guides for developing 35 MPa high pressure axial piston pump.
Dynamic Stability of an Axially Moving Yarn with Time-Dependent Tension
Authors: Li You Guo
Published: February 2014

In this paper the nonlinear transversal vibration of axially moving yarn with time-dependent tension is investigated. Yarn material is modeled as Kelvin element. A partial differential equation governing the transversal vibration is derived from Newtons second law. Galerkin method is used to truncate the governing nonlinear differential equation, and thus first-order ordinary differential equation is obtained. The periodic vibration equation and the natural frequency of moving yarn are received by applying homotopy perturbation method. As a result, the condition which should be avoided in the weaving process for resonance is obtained.
Effect of Cryogenic Treatment on Friction and Wear Property of DLC Film/304 Stainless Steel
Authors: Zhao Yang , Nie Chao Yin , Jin Yi Dong , Zhu Wen , Liu Xiao Dong , Nie Yan Zhong
Published: February 2014

The systems of DLC film/304 stainless steel were separately treated with cryogenic treatment,annealing treatment and composite treatment of cryogenic+annealing to study the effects of different treatments on friction and wear property of DLC film/304 stainless steel,mainly from the film’s hardness,fracture toughness and surface roughness. The results show that the friction and wear property of DLC film/304 stainless steel is improved in different degrees by the three kinds of treatment,single cryogenic treatment performs best. It is because that three kinds of treatment all can improve the fracture toughness of DLC film and reduce DLC film’s surface roughness,but only single cryogenic treatment doesn’t reduce film’s hardness and makes film get the best lubricity and highest hardness-to-elasticity ratio. The residual stress of film/substrate composite system can be effectively adjusted by cryogenic or annealing,but annealing often sacrifices DLC film’s hardness as the price.
The Optimization Design and Research of CX20 Clutch Friction Plate
Authors: Shi Lei Ming , Feng Shun Li , Wang Zhi Hong , Shao Yi Ming , Jian Xiao Chun
Published: February 2014

With the help of the orthogonal experiment and the friction-wear mechanism by car as the research object of the clutch driven platen friction plate of Chongqing Changan CX20 auto power take-off installation, the optimization of clutch friction materials is studied.It was selected for the resin-base fiber materials of clutch driven platen to be commonly used in auto mechanical manufacture. It was analyzed for the abrasion mechanism of the clutch driven platen friction plate between the flywheel and the pressure plate,and discussed for the relationship of driven platen friction-plate heat recession-performance and the driven plate material at high temperature. The results show that the friction factor of the optimized driven platen lining materials do not change. In the process of the frequent friction heating to high temperature, the stability of the optimized driven platen lining materials is strong, the wear of those is reduced, and the optimized driven platen lining materials have good performance of high temperature-thermal recession.
Analysis on the Waste Heat Utilization of Lower Temperature of Steelworks Based on the Theory of Total Energy System
Authors: Han Ming Rong , Huang Long Qiang , Yin Jian Guo
Published: February 2014

Taking the waste heat utilization of sintering circular cooler in Chongqing Iron & Steel Co.,Ltd as an example, the problems of the system have been analyzed and some measures have been presented based on the theory of total energy system in this paper. The result shows the main reasons that the generated energy can only reach the design value of 60% are lower energy grade because of oversintering or undersintering of sinter, the air leakage of waste gas recovery system of sintering circular cooler, frequent short interruption of sinter flow and so on. Some measures which can improve the energy grade of waste heat of sintering circular cooler and increase the generating capacity have been proposed. These measures involve controlling the end point of sintering, improving the operation level of main process, improving sealing technology of the system, recycling the heat of the boiler outlet flue gas, cascading utilization of the heat of third section of the sintering circular cooler, valuing the conversion and utilization between the various forms of energy, such as work, heat, the internal energy of working medium.
Numerical Study on Heat-Flow Density of Aerospace Plane
Authors: Chen Shuang , Mai Hai Bo
Published: February 2014

Relying on the status of existing thermal protection system and existing flight parameters, appropriate metal thermal protection system being able to reproduced are designed. Then, based on the highest temperature thermal protection materials can bear, flying height of aerospace plane and Mach number, the numerical method was utilized to reveal the heat-flow density of stagnation point on the sharp- nose and the distribution of heat-flow density.
Simulation on Temperature Characteristics of Solar Cell
Authors: Jiang Yu Chuan , Yang Fang Quan , Hu Gang Lin
Published: February 2014

The core of the system is a solar photovoltaic cell, a solar cell to work well not only to the battery materials, structures, is also affected by the external working conditions. Effect of temperature is an important condition of the battery efficiency. In this paper, how temperature affects battery features a comprehensive theoretical study, results showed that at a temperature of 300K, as M1.5 solar spectrum, the theoretical limit of solar cell conversion efficiency of 33%, corresponding to the optimum band gap of 1.4 eV. Provide a basis for the design and experimental battery.
Study on the Forming Accuracy of TRIP Steel Products in ISF
Authors: Li Li Hua , Wang Bao Ping , Wang Jin , Zhao Cheng
Published: February 2014

Incremental Sheet Forming (ISF) is a flexible technology for forming customized productions in small batch, and has received wide attention, especially in the automobile manufacturing industry, where TRIP(Transformation Induced Plasticity) steel is widely used for its great ductility and high strength. But the springback of TRIP steel products is more serious than that of common steel ones, which induce the low dimensional accuracy and block the industrial application. This work would illustrate the experimental research on the dimensional accuracy of TRIP steel products in ISF. To make a reasonable accuracy evaluation, square cone-shaped samples of 1060Al and 08F steel were formed by ISF as the reference. By comparing the outline unconformity and the dimensional deviation, it comes to the conclusion that dimensional accuracy of TRIP steel sheet products is much lower than that of other materials.
RF MEMS for Reconfigurable RF Front-End: Research in Australia
Authors: Gong Liang , Chan King Yuk , Yang Yi , Ramer Rodica
Published: February 2014

This paper reviews some ground breaking development of RF MEMS technology in Australia at the UNSW, over the past decade. It presents some unique and novel designs using RF MEMS switches to achieve reconfigurable RF front-end circuits. These designs include multiport RF MEMS switches, switch matrices, reconfigurable filters and antennas. The resulting devices achieved RF performance that is unmatched by any existing RF andmicrowave technologies.
Surface Enhanced Raman Scattering Based on Dielectric-Loaded Surface Plasmon Polariton Waveguides
Authors: Xiao Jing
Published: February 2014

We propose a novel structure to achieve large field enhancement of nanoparticles with silica shell for SERS that nanoparticles are place on a dielectric-load surface plasmonpolariton waveguide supporting guided modes in microfluid detection system.
Investigation of Room Temperature Photoluminescence of ZnO Films Induced by Different Laser Fluence Irradiation
Authors: Zeng Yong , Zhao Yan , Jiang Yi Jian
Published: February 2014

In this paper, we investigated the photoluminescence property of ZnO films which were irradiated by KrFexcimer laser. Through the analysis of photoluminescence and UV-VIS spectra, it is shown that the red shift of band gap forthe irradiated sample. Room temperature UV photoluminescence of ZnO film is composed of contribution from the FX, the neutral donor bound exciton (D0X) emission and the longitudinal optical (LO) phonon replicas of the bound exciton transition (D0X-1LO). The visible emission band is ascribed toVO+, VZn-, Oiand Vo++. It shows that KrF laser irradiation could effectively modulate the exciton emission, which is important for the application of high performance of emitting optoelectronic devices.
The Impact Response Characteristics Research of the Multilayer Structure, Cantilever-Type Electrothermal Actuator Based on MEMS
Authors: Wang Ya He , Shen Yue Yue , Lv Chao
Published: February 2014

To study the impact response characteristics of multilayer structure, cantilever-type electrothermal actuators based on MEMS, a composite cantilever-beam model consisting of two layers of materials, SiO2 and Al, is built. By using the engineer mechanics theory, the von mise stress under the impacts in the fuze system can be obtained. Meanwhile, the Finite Element Method (FEM) simulation is made to get the deformation displacement of the fixed end and the von mises stress distribution of the model. Besides, the natural frequency response is studied. The results present the actuators response characteristics of impacts in the fuze system.
Theoretical Method Research on a MEMS Safety and Arming Device
Authors: Liu Fang Yi , Lou Wen Zhong , Wang Fu Fu , Wang Ying
Published: February 2014

With the intelligent development of small-caliber ammunition, the overall size of the fuze is compressed. In this paper, a theoretical method-energy statistical method has been proposed according to the MEMS S&A device. Taking the slider mass, micro-spring stiffness, latch mechanism size, and initial offset distance into account, the conversion relationship among each part of energy in the process is obtained. For an existing structure of MEMS S&A device, known parameters are utilized to reverse the overload value at arming condition. The ANSYS/LS-DYNA finite element analysis software is used for simulation analysis, thereby confirming the feasibility of theoretical calculations. Also, theoretical calculation error ε is obtained, which to be 0.7%. Energy statistical method and simulation analysis serve as theoretical references for the design of the MEMS S&A device.
Optimization of Dinamics of Chemical Reactor
Authors: Mamedova A.A. , Veliyeva F.M.
Published: February 2014

The theoretical optimization of the process was based on our kinetic model of MCH dehydroalkylation with methanol in the presence of HNa TsVM zeolite (SiO 2 /Al 2 O 3 =30) modified with platinum and gallium and gadolinium oxides.
Contribution of Magnetostriction to Transformer Core Vibration under DC Bias
Authors: Yan Rong Ge , Wang Xi Feng , Zhu Li Hua , Yang Qing Xin
Published: February 2014

An important source of transformer core vibration is magnetostriction of the thin silicon-steel lamination. In the power grid, direct current (DC) may form by solar magnetic storms and DC transmission. Transformer core supersaturation and harmonic increase in current caused by DC bias will intensify magnetostriction and produce additional transformer core vibration. In order to obtain transformer core vibration under DC bias, the magnetization curve and magnetostriction characteristics of thin silicon-steel lamination are measured. Then, this paper establishes a numerical magneto-mechanical strong coupling model including magnetostrictive effect under DC bias for three-phase three-column dry transformers. On the basis of the proposed model, and the measured magnetic characteristics of the thin silicon-steel lamination, transformer core vibration under DC bias and no-load condition has been calculated. In order to verify the proposed model, transformer core vibration under DC bias and no-load condition is studied experimentally. Numerical calculation results together with experimental results confirm the validity of the proposed method.