bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Phosphating Technologies on Corrosion Resistance of Phosphate Coatings on 6063 Aluminum Alloy
Authors: Lin Bi Lan , Xu Yu Ye , Tian Biao
Published: December 2011

The basic formulation and technologies of phosphating for 6063 aluminum alloys were discussed to enhance the corrosion resistance. The effect of phosphating time, pH, ZnO, H3PO4 and NaF content on corrosion resistance was investigated using Tafel polarization methods. The results show that the optimum phosphating technologies of 6063 aluminum alloys are as follows: 7 g/L ZnO, 20 mL/L 85% H3PO4, 1.2 g/L NaF, pH 3.0, temperature 45±2°C, phosphating time 7 min. After phosphating treatment the anodic and cathodic corrosion processes of 6063 alloys are suppressed greatly, and the corrosion resistance is enhanced.
Relative Activities of Deformation Modes in AZ31 Magnesium Alloy Predicted by Mesoscopic Crystalline Model
Authors: Yin De Liang , Liu Jin Qiang , Chen Xin
Published: December 2011

A mesoscopic crystalline model was proposed to quantitatively analyze the relative activities of deformation modes involved in the plastic deformation of an AZ31 magnesium alloy at room temperature. The plastic response of a cast AZ31 magnesium alloy with random texture can be well predicted by this model. It is demonstrated that the remarkable difference of relative activities of  pyramidal slip should be attributed to the different strain hardening behavior in tension and compression. Further TEM micrographs shows the occurrence of  pyramidal slip in compression, which confirms the validity of the proposed model.
Thermodynamic Study on CuInO2 Preparation by Solid Reaction Method
Authors: Yao Yun , Xie Gang , Song Ning , Yu Xiao Hua , Li Rong Xing
Published: December 2011

In this paper, the standard entropy, heat capacity at constant pressure, standard enthalpy and standard Gibbs free energy of formation are estimated by application of two-parameter model. The model is relatively simple, accurate and practical. Based on the thermodynamic data for related pure compositions are reported, the five possible chemical reactions in the Cu2O-In2O3 system are studied in the process of preparation CuInO2 by solid reaction method. The relations between equilibrium constant and temperature is plotted. The curves of -T and lgK-1/T for the chemical reactions in the system have also been fitted. The results show that the Cu2O is easy to be oxidized into CuO, which reacts with In2O3 to yield Cu2In2O5 at lower temperature. However, the CuInO2, which is prepared from the Cu2O-In2O3 system, is oxidized into Cu2In2O5 easily in the oxygen atmosphere. The reaction of preparing CIO was reversible and incomplete. Therefore, preparation CIO is very difficult by solid reaction method whether in atmospheric pressure or isolated air and gas shield conditions, because K1 >-40kJ/mol.
Electrochemical Corrosion Behavior of Different Heat-Treatment Temperature Fe-Based Bulk Amorphous Alloy
Authors: Chen Qing Jun , Yu Hui Yan , Zhou Xian Liang , Hua Xiao Zhen
Published: December 2011

Abstract: Fe41Co7Cr15Mo14C15B6Y2(at%) bulk metallic glass was prepared by copper mold casting. Nano-crystalline Fe41Co7Cr15Mo14C15B6Y2alloys were obtained by annealing. The influence of heat treatment at different temperatures in the alloy microstructure was identified by X-ray diffraction (XRD), and a comparative study of the electrochemical corrosion behaviors of amorphous and amorphous/nanocrystalline alloys was performed by potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS) in 1.5M HCI solution, and the corrosion morphologies of the samples were observed by scanning electron microscopy (SEM). The results show amorphous alloy plays excellent anti-corrosion ability than that of the heat-treated samples, and the anti-corrosion ability of amorphous/nanocrystalline alloys decrease with the increasing of heat-treatment temperature.
Study on Damping Capacities of Nodular Cast Iron Dense Bar Produced by Horizontal Continuous Casting
Authors: Zhang Zhong Ming , Wang Jin Cheng , Xu Chun Jie , Li Wei Ming , Wang Gang
Published: December 2011

Damping capacities of the annealed nodular cast iron dense bar produced by horizontal continuous casting were measured by Dynamic Mechanical Analyzer. The relation of damping capacities with vibration amplitude, frequency and temperature was analyzed to investigate the damping mechanism of the alloy. The results show that the damping capacities increase with increasing temperature and frequency. The internal friction spectra exhibits two internal friction peaks at about 40°C and 150°C and caused by Snoek relaxation and Snoek-Köster relaxation, respectively. The maximum damping capacity can be obtained at about 63Hz. The damping is positive amplitude-dependent, whereas critical amplitude exists where the damping increases dramatically. The temperature-dependent damping results from the superposition effect of point-defect damping, grain boundary damping and interface damping, while dislocation damping is predominant in the frequency dependent damping. The amplitude dependent damping can be interpreted by G-L theory.
Characteristics of NEPE Propellant with Ammonium Dinitramide (ADN)
Authors: Pang Wei Qiang , Xu Hui Xiang , Li Yang , Shi Xiao Bing
Published: December 2011

The theoretical performances of NEPE (nitrate ester plasticized polyether) propellant with and without ADN were calculated with minimum free energy method. The burning characteristics and the thermal decomposition of propellants were determined by nickel chromium wire method and TG- DTG, respectively. The SEM of NEPE propellants and the mechanical sensitivity were also detected. The results show that the specific impulse and the adiabatic flame temperature are increase with an increase in the content of ADN oxidizer. The burning rate and pressure exponent of propellant with a change of pat content of ADN can be boosted higher than those of the AP formulations.
The Study about Microstructure Characterization of AlCoCrTiNiCu_x High Entropy Alloy System with Multi-Principal Element
Authors: Wang Chun Wei , Mo Zhuo Qiang , Tang Jian Jiang
Published: December 2011

The microstructure and phase structure of AlCoCrTiNiCu_x which are made of six class transition metal elements have been studied in this paper. The results indicated that the change process of microcosmic crystal-structure of the five group high entropy alloy of AlCoCrTiNiCu_x system is transformed from FCC（mainly）+ BCC crystal structure (X=0.5、X=0.8) to FCC+BCC+ primary lattice crystal structure (X=1.0、X=1.2), finally, the crystal-structure turn into BCC+ primary lattice crystal structure as the content of Cu further increasing.
Preparation and Characterization of Monocrystal Nano-Sliver Lamella
Authors: Fan Hai Lu , Liu Zhi Ping , Chen Shu Yi
Published: December 2011

Monocrystal nano-sliver lamella were prepared by hydrothermal method with the precursor Ag2C2O4and the surface active agent polyvinyl alcohol (PVA). The influence of the dosage of PVA on the film thickness and yield of nano-sliver lamella (NSL) were analyzed. And the morphology, the film thickness and electron diffraction pattern of NSL were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM) respectively . Furthermore,the same sample was respectively characterized by the parallel optical path and the focus optical path of X-ray diffraction (XRD), and the difference between the diffraction data of these two paths was compared. The results show that the dosage of PVA has significant effect on the thickness and yield of monocrystal nano-sliver lamella. The reason that the great difference between diffraction data of the parallel light path and focusing light path can be mainly owing to the preferential orientation in space of NSL.
The Research on Polyxymethylene Silicon Oxide Whisker Polybasic Thermal Stabilizes Composite Material
Authors: Han Cun Cang , Lin Shi Lan , Li Ying
Published: December 2011

This thesis does research on a method which can produce a kind of polyxymethylene composite material with fine performance. Nanometer Silicon Oxide Whisker is used as stuffing filler to intensify the strength and tenacity of polyxymethylene, the proper amount can be determined by the test of Sio2W’s influence on polyxymethylene’s characteristics. In the test ,Sio2w is used as toughening agent, MgO/Triethylene glycol dimethacrylate/dicyandiamide are used as thermal stabilizer, from the proportioning test, polyxymethylene Sio2w poly basic Thermal Stabilizer composite Material can be produced, which has high strength, .hardness impact toughness and thermal stability.
Formation of Decarbonization Layer and its Effect on Corrosion Resistance of Zirconia Graphite Materials
Authors: Qian Fan , Li Hong Xia , Liu Guo Qi
Published: December 2011

The effect of graphite content on formation of decarbonization layer and corrosion resistance of zirconia graphite materials were studied by the corrosion test in induction furnace, and the effect of decarbonization layer on corrosion of zirconia graphite materials was also analysed by the kinetic models for the corrosion of SEN in mold, the result show that: (1) Thickness of decarbonization layer of slag line is decreasing with the increase of graphite content. When the mold fluxes for high carbon steel is used, decarbonization layer is thin and graphite content has little effect on corrosion resistance of zirconia graphite materials, and 10wt%graphite is better. When the mold fluxes for low carbon steel is used, decarbonization layer is thick and 14wt% graphite is the best. (2) Corrosion of zirconia graphite materials in mold is characterized by the features of consecutive reaction:original layer (k1) decarbonization layer (k2) corrosion layer . If k1<>k2, there is decarbonization layer on the hot surface of zirconia graphite materials and the corrosion of the layer is the key step. Graphite content is too high or too low is all harmful for the corrosion resistance of zirconia graphite materials.
A Study on the Tensile Strength of the Layer Splice Laminates
Authors: Wang Ling , Jia Pu Rong , Jiao Gui Qiong
Published: December 2011

The tensile strength of carbon fiber reinforced resin matrix layer splice laminate was studied. Three specimens (M1.M2.M3) were cut from laminates with different joint location and the number of layer splice. Load schemes were performed and typical load-displacement curves of three specimens were recorded. The result shows that the joint location has seriously effect on the tensile strength and modulus of specimens. The tensile strength of M2 is obviously lower than that of M1 and M3. Furthermore finite element ABAQUS6.5 was also used to simulate the course of experimental test. The result shows that shear stress concentration occurs on the joint of model. The shear stress on the model M1 and M2 has the similar trend and concentrates in the middle of the joint area. And on the model of M3 the shear stress has a completely different trend from the M1 and M2 model. On the M2 the shear stress concentration is slightly higher than the other two. It indicates that the tensile strength of M2 is the lowest among the three models. So, the inter-laminar shear stress is the major factor leading tensile failure. The experimental tests are consistent with the finite element analysis.
Synthesis and Characterization of Temperature-Sensitive TSPU/PNIPAAm Semi-IPN Polymer
Authors: Wang Yi Chun , Dai Zheng Wei , Xue Yuan
Published: December 2011

Thermo-sensitive polyurethane (TSPU) was synthesized from poly(ε-caprolactone) and 4,4’-methylenebis (phenyl isocyanate) by a two-step process with 1,4-butanediol as the chain extender. Following that, a novel temperature-sensitive material was created by the strategy of IPN from TSPU and PNIPAAm in the method of in situ polymerization. The chemical structure and thermo properties of the semi-IPN were characterized with FT-IR and DSC. The results prove that intensive inter-molecular interactions exist between TSPU and PNIPAAm chains, which have significant influence on the phase transition behaviors of the material. According to these results, the transition temperature of the semi-IPN can be adjusted in the range of 30~40 °C by controlling the composition of TSPU and the semi-IPNs.
Preparation and Properties of CNTs-Ti3Al/B4C Composites
Authors: Fan Yan Hua , Dong Li Hua , Liu Bo Yang , Yin Yan Sheng
Published: December 2011

CNTs-TiAl/B4C composite has been obtained by high energy ball milling and hot press sintering. These technical process promoted the solid reaction and resulted in the formation of composites comprising Ti-Al, TiC, TiB2 and B4C. The SEM images and measurement of the mechanical properties proved that the addition of 1.5wt.% CNTs further improves the fracture toughness and the bending strength of TiAl/B4C composites.
Mechanical and Ablative Properties of Polyacrylonitrile(PAN)/RTV Silicone Internal Insulating Composites
Authors: Li Dong , Chen Hong Xia , Chen Zhu , Li Yang , Wu Shu Xin , Wang Ji Gui
Published: December 2011

The polyacrylonitrile short fibers/ room temperature vulcanizing silicone rubber (PAN/RTV silicone) composites were prepared by mechanical mixing method and vulcanization at room temperature for 7 days as internal insulator. The effects of the content of fiber on the mechanical and ablative performances for the composites were investigated. The results show that with increasing content of PAN fiber filled, the tensile strength increases, the break elongation decreases, and the ablation rate(Rt) of PAN/silicone composites decreases rapidly at first, then increases. When PAN fiber content is 10phr, the ablation rate(Rt) is 0.06mm/s.
Fabrication and Characterizes of TiO2 Nanomaterials Templated by Lyotropic Liquid Crystal
Authors: Liu Li Hua , Bai Ying , Wang Fu Min , Liu Ning
Published: December 2011

TiO2 nanomaterials were synthesized in lyotropic liquid crystal formed by nonionic surfactant TritonX-100 and TiOSO4 aqueous solution with NH3•H2O as precipitator. The lyotropic liquid crystals were characterized by means of POM and Low-angle XRD. FT-IR, TGA, XRD, TEM were used to characterize the TiO2 samples. It was found that all the lytropic liquid crystal were in lamellar liquid crysal phase and after casting the micro-structure of the LLC phase, the TiO2 samples were self-assemble to form lamellar, sphere and rod structures. According to the characterization results, possible formation mechanism was proposed.
Agglomeration Eliminating Antimony Doped Tin Oxide (ATO) Nanoparticles by Different Drying Methods
Authors: Liu Zi Li , Dai Qian Wen , Chen Sheng Zhou , Guo Zhe
Published: December 2011

Antimony doped tin oxide (ATO) nanoparticles were synthesized via complex-homogeneous coprecipitation. Then different drying methods (such as azeotropic distillation, infrared drying and microwave drying, etc.) were used to eliminate the agglomeration. The nanoparticles were characterized by thermal analysis, X-ray diffraction (XRD), and Brunauer-Emmett-Teller measurements (BET). The result shows that ATO nanopaticles with tetragonal rutile phase structure are all well crystallized after the drying processes above, and the average grain size is between 29.30 nm and 71.52 nm. The grain size estimated by BET method is similar to the result of Scherrer equation, and the nanoparticles prepared by azeotropic distillation have better crystallinity comparing to other methods. With the extension of the distillation time, the grain size increases, and the colour changes from grey blue to light grey. Moreover, the combination of azeotropic distillation and infrared drying can prepare smaller and better crystalline ATO nanoparticles.
Purification of Carbon Nanotubes by Microwave Technology
Authors: Wu Yong Qiang , Sun Si Kai
Published: December 2011

This As a new type of nano-carbon materials , CNTs have special structure and exhibit excellent mechanical properties, electrical properties, electromagnetic properties, the unique micro-structure, high aspect ratio and high specific surface area. So CNTs have great potential value in many areas. However, there are a large number of catalyst particles and amorphous carbon particles in CNTs during preparation. So carbon nanotubes must be purified before used. This thesis studied the purity of CNTs by microwave technology, improved the surface of the carbon nanotubes, strengthen the structure and properties of carbon nanotubes, reduced the impurities of CNTs, the pretreatment of CNTs has been expanded and got the best parameter of microwave technology
Electrochemical Corrosion Behavior of Cu-20Fe-12Cr Alloys with the Different Grain Size in Solutions Containing Chloride Ions
Authors: Cao Zhong Qiu , Xue Rong , Bian Jing , Fu Ya Jun
Published: December 2011

Electrochemical corrosion behavior of Cu-20Fe-12Cr alloys prepared by powder metallurgy (PM) and mechanical alloy (MA) with the different grain size was studied in solutions containing chloride ions. The free corrosion potentials move toward negative values and corrosion rates become faster with the increase of chloride ion concentrations for two alloys. Electrochemical impedance spectroscopy (EIS) plots of PMCu-20Fe-12Cr alloy are composed of a capacitive loop and a diffusion tail. Corrosion processes are controlled by diffusion. EIS plots of MACu-20Fe-12Cr alloy in Na2SO4 or 0.02mol.L-1NaCl solution are unable to have characteristics of Warburg impedance. Corrosion processes are controlled by electrochemical reactions. After chloride ion concentrations increase up to 0.05mol.L-1, their EIS plots are composed of double capacitive loops with a straight line induced Warburg resistance between two capacitive loops. The above EIS plots imply the existence of pitting corrosion. The corrosion rates of MACu-20Fe-12Cr alloy become faster than those of PMCu-20Fe-12Cr alloy because the reduction in the grain size of MACu-20Fe-12Cr alloy produces large concentrations of grain boundaries.
Preparation and Characterization of Titania Porous-Nanotube Arrays with a High Growth Rate on Flexible Stainless Steel Substrate
Authors: He Xue Ting , Tao Jie , Tao Hai Jun , Bao Zuo Guo
Published: December 2011

Ti film sputtered on flexible stainless steel substrate that rolled by 20-high Sendzimir Mill, was anodized in ethylene glycol bath in the presence of 0.5 wt.% NH4F and 3 vol.% H2O at a high voltage of 60 V. High-aspect-ratio porous-nanotube arrays (PNTAs) of TiO2 with the tubes length of 6.2 µm were quickly prepared from Ti film, at the high growth rate of 20.7 nm·s-1. Then the morphology and structure of PNTAs were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD), respectively. Finally, a DSSC with the photoanode of PNTAs exhibited a performance of Jsc= 2.40 mA·cm-2, Voc= 0.79V, FF = 0.57 and η = 1.08%.
Shape Modification of Net Shaped CuO and Cu Nano Particles for a Percolation Threshold Using a Chelating Agent
Authors: Hwang Ji Hyun , Ucol Justin M , Lee Keun Woo , Ortega Ada , Kim Nam Soo
Published: December 2011

Synthesized spherical nano metal particles produced in aqueous solution have applications in printing technologies. However, an alternate method for achieving a percolation threshold is to mix the spherical shape of the particles and become net-shaped copper oxide with a minimum weight percent of particles. In this study, before reducing to copper metal, copper oxide was synthesized first without the chelating agent for achieving a net shape and copper metal nano particles were synthesized with the chelating agent, bypassing the process of creating copper oxide. Potassium sodium tartrate was the chelating agent used to control the shape of copper metal nano particles in an alkaline solution. Various concentrations of potassium sodium tartrate changed the shape of these particles from web-like at low concentrations to needlelike and more spherical at higher concentrations. Potassium sodium tartrate restrained the coordination bonds around the metal particles, controlling the shape to be more spherical. Altering the pH in absence of potassium sodium tartrate changed the conditions for the formation of particles according to the Eh-pH diagram for copper, forming net-shaped copper oxide particles when the pH was 12-13 and a cubic shape when the pH was 5-6. The composition of the nano particles in both cases was confirmed using examination by XRD. These shapes have the potential to possess favorable electrical and thermal properties as predicted by bond percolation and the percolation theory.
Fabrication of MgO-SiC Refractory Composite Powders by High-Silicon Magnesite and Carbon Black Powders
Authors: Zhu Hong Xi , Lv Zhi Jiang , Deng Cheng Ji , Yuan Wen Jie
Published: December 2011

MgO-SiC refractory powders were prepared by using high-silicon magnesite and carbon black powders as the starting materials calcined at 1550 to 1650 °C, respectively, for 3 hours under argon atmosphere. The phase compositions and microstructure of samples are characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects of the calcining temperature and the proportion of carbon black on the synthesis of MgO-SiC refractory powders were investigated. The results show that high-silicon magnesite reacts with carbon black to form MgO and SiC as the main phases, and the minor phases include FeSi, Ca3Al2Si3O12 and Mg2SiO4. Carbon black content is the key factor to affect the synthesis of MgO-SiC composite powders.
Process Factors Using Centrifugal Spray Drying to Prepare Bauxite Microspheres
Authors: Cheng Xiao Su , Peng Meng Qi , Zhong Yu Fa
Published: December 2011

The centrifugal spray drying process of bauxite slurry was studied to investigate the influence of slurry solid content on the particle size distribution and the sphericity of the microspheres, and so was operation technology on average diameter and the sphericity of the microspheres. The optimal operation parameters are obtained to prepare high spherical microspheres bauxite with the diameter distribution of 100 μm and whose particle size distribution is narrow: the slurry solid content is 70 wt%, the dry air temperature is 250 °C, the rotation rate of spray head is 6000 rpm and the feed flow rate is 1 L/h in the experiments.
Magnetite and Anti-Microbial Properties of Ag2O-CaO-Fe2O3-SiO2 Glass-Ceramic by Sol-Gel Method
Authors: Li Bin , Chen Hai Feng , Wen Li Hua , Ma Chen
Published: December 2011

Ag2O-CaO-Fe2O3-SiO2glass-ceramic was prepared by the sol-gel method. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) were used to investigate crystallization process of Ag2O-CaO-Fe2O3-SiO2glass. The kinetic results show that the values of the activation energy and frequency factor of the glass are 441.991 KJ/ mol and 1.58×1020, respectively. And the dimensionality of crystal growth, n, decreases as the heating rate increases. The crystalline phases of the glass-ceramic are magnetite, wollastonite and minor hematite. The saturation magnetization and coercive force of the heat-treated glass are 0.08 Wb/m2and 14 KA/m at room temperature. The glass-ceramic has some capacity of anti-microbial.
Preparation of Magnetic Fe3O4 Nanoparticles by Microbial Reduction Combining Natural Oxidation Method
Authors: Liang Zhan Guo , Mu Jun , Shi Ji Cheng
Published: December 2011

By using microbial reduction combining natural oxidation method, magnetic Fe3O4nanoparticles have been synthesized. Sulfate-reducing bacterium(SRB) was used to reduce ferric sulfate to produce ferric sulfide, then ferric sulfide was oxidized to iron protoxide and ferroferric oxide in the end under natural air oxidation condition. The size and morphology of the product and SRB was examined by scanning electron microscopy(SEM), the microstructure were investigated by X-ray diffraction(XRD) and energy dispersive spectroscopy(EDS). There are only two components(xFeO and yFe3O4)which is testified by XRD and EDS. The constituents of product were analysed by using energy dispersive spectroscopy(EDS). In result, x,y actual numerical value which is respectively mole fraction of FeO and Fe3O4in the product is figured out 0.678 and 0.322.
The Dielectric Tunability of Fe-Doped Pb0.3Sr0.7TiO3 Thin Films Prepared by Sol-Gel Method
Authors: Sun Xiao Hua , Hou Shuang , Li Xiu Leng , Peng Tian You , Zhao Xing Zhong
Published: December 2011

Fe-doped Pb0.3Sr0.7TiO3 (PST) thin films have been fabricated on Pt/Ti/SiO2/Si substrates with sol–gel method. The structure and surface morphology of Fe-doped PST thin films were investigated as a function of Fe concentration by x-ray diffraction (XRD) and atomic force microscopy (AFM). The dielectric measurements were conducted on metal-insulator-metal capacitors at the frequency from 100 Hz to 1M Hz at room temperature. It’s found that the dielectric constant, dielectric loss and tunability of Fe-doped PST films decreased with the increase of Fe content. The effects of Fe doping on the microstructure, dielectric and tunable properties of thin films were analyzed. Though the undoped PST thin film exhibited the highest dielectric constant of 2011 and the largest tunability of 76%, the 6 mol% Fe doped PST thin films had the highest figure of merit (FOM) of 17.9 for its lowest dielectric loss.
Migration Principle of Chlorine in BF Production
Authors: Liu Xiao Jie , Lü Qing , Zhang Shu Hui
Published: December 2011

By the calculation of material balance, and research on the main processes of income and expenditure of chlorine in BF production , the migration principle of chlorine during BF production process can be concluded. The specific measures on how to reduce its influence in BF production are offered.
Influencing Factors and Mechanism of Cobalt Redissolution from Zinc Sulphate Solution
Authors: Zeng Gui Sheng , Li Ming Jing , Xie Yu
Published: December 2011

Redissolution of cemented cobalt from zinc sulphate solution occurs, and is a well known problem among zinc producers. A variety of mechanism of cobalt redisisolution have been proposed in the literatures, however, it is still not very well understood. The influencing factors of cobalt redissolution such as detention time, oxidation, particle size of zinc dust and copper ion have been investigated in this paper. The redissolution does not occur when very large particles are used but the redissolution of cobalt is significant from small zinc particles. The redissolution is obvious with copper ion added, while the redissolution is not occurred from the zinc sulphated solution without copper ion added. The redissolution mechanism of cobalt is obtained.
High-Temperature Oxidation Kinetics of Galvalume-Coated Steel Sheet
Authors: Wu Yue , Luo Qun , Zhou Biao , Jin Feng , Li Qian
Published: December 2011

The high-temperature oxidation kinetics of Galvalume-coated steel sheet and Q235 steel sheet were studied by thermogravimetric analysis (TGA). A new diffusion equation was deduced and used to investigate their kinetic mechanism. The characteristic time (tc) in the equation can be expressed as a function of temperature T, diffusion coefficient D0, thickness of the steel sheet H, etc. The calculated result showed that the oxidation reaction rate of Galvalume-coated steel sheet was slower than that of Q235 steel sheet through comparing the values of tc. Besides, the oxidation reaction rate increased with the temperature rising from 750 to 850 °C. Compared our experimental data with the theoretical value calculated by the new function, a good agreement has been obtained.
Study on the Influence Factor of the Caustic Calcined Dolomite Based Compound Desulfurizer Melt Point
Authors: Li Jie , Pan Jun , Wang Shi Jun
Published: December 2011

Caustic calcined dolomite based compound desulfurizer by the silicon thermal reduction method was taken as study object. Effect of fluxing agent and heating agent on caustic calcined dolomite based compound desulfurizer melting point was studied. The result showed that heating agent was the major influential factor for the melting point of compound desulfurizer, melting point of the compound desulfurizer gradually reduced with the increase of heating agent. Fluxing agents of CaF2and SiO2were the minor influential factors for the melting point of compound desulfurizer. The lowest melting point condition for the compound desulfurizer was：7% CaF2+11% Al2O3+17% SiO2+ 56% heating agent.
Formation and Prevention of Sliver Defects on the Surface of Cold-Rolled Strip
Authors: Gao Wen Fang
Published: December 2011

Abstract The feature and formation of and preventive measures against common black and bright slivers on the surface of cold-rolled strip are described. Research reveals that the formation of slivers is closely related to the processes of steel making and rolling as well as conditions of equipment in operation, and, in most cases, due to different factors affecting together. Only when the actual forming mechanism is made clear could effective measures be formulated.
Research on RDI+3.15 of Respectively Granulating Sintering
Authors: Sun Yan Qin , Lu Qing , Wu Wei Nan
Published: December 2011

The RDI of vanadium-titanium sinter is serious， which has directly affected on BF production. The mineral compositions and microstructure of two vanadium-titanium sinters are studied in this article: Chenggang respectively granulating sinter and common sinter. And the Influent factors on improving the RDI of vanadium-titanium sinter by respectively granulating sintering had been ensured.
Detection of Interface Displacement of Liquid Metal Using Magnetic Field Tomography
Authors: Men Shou Qiang , Xiao Hong Bo , Resagk Christian
Published: December 2011

Magnetic field tomography was applied to reconstruct the oscillating interface between liquid GaInSn alloy and aqueous KOH solution in a simplified cylindrical aluminum reduction cell. A direct electric current was imposed similar to the industrial reduction procedure, and a pneumatic shaker was used to excite interfacial instabilities with non-axisymmetric interface modes at the same time. The deformed interface led to a perturbation to the magnetic field which was measured by a sensor array. By fast Fourier Transforms, a database was generated and exploited to reconstruct the interface oscillation by solving an inverse problem.
Effect of Lance Nozzle Angle and Mixing Gas Blowing on BOF Process
Authors: Xu Dong , Cang Da Qiang , Zhang Ling Ling , Qin Li Xue , Duan Jian Feng
Published: December 2011

The hot experiment was carried out to study the effect of lance nozzle and mixing gas blowing on steelmaking. The heat load of oxygen lance, component in the bath and dust generation were studied in the hot experiment under different lances and mixing blowing process. The absorbed heat is lower and the slag adhesion on the oxygen lance is reduced with the lance nozzle angle increasing. By using small portion of carbon dioxide as top gas is help to reduce the temperature in the impact area and decrease the dust generation, but the decarbonization rate decrease with the proportion of carbon dioxide increasing.
Application of Small Molecular Inhibitors in Reconcentration of Iron Ore Tailings
Authors: Liu Wen Gang , Wei De Zhou , Han Cong , Cui Bao Yu
Published: December 2011

Application of small molecular inhibitor in reconcentration of iron ore tailing by direct flotation are discussed. From the results, it can be seen that organic inhibitors are more effective than inorganic inhibitors. When sodium hexametaphosphate and sodium silicate are used as inhibitor, iron grade in concentrates is no more than 30%. However, when organic inhibitors are used as used, iron grade in concentrate are more than 30%. And 2,4-dibydroxy-benzoic acid is the most effective inhibitor to depress quartz. When it is used, iron grade in concentrate is more than 35%. Measurement results of infrared spectrum show that hydrogen bonding adsorption occur between inhibitor and quartz surface.
Experimental Study on Recovering Fine Cassiterite from Spontaneously Combusted Dachang Cassiterite-Polymetallic Sulphides
Authors: Zhou De Yan , Feng Jin Peng , Wei Zong Wu , Yang Jin Lin , Ma Shao Jian , Mo Wei , Su Xiu Juan
Published: December 2011

Fine polymetallic sulphides in Dachang mining areas are very difficult to be recovered. In order to solve this problem, a new flowsheet of jet centrifugal concentrator separation-flotation-tabling separation was adopted in this study, which means that jet centrifugal concentrator was firstly used to preconcentrate fine cassiterite, then flotation was introduced to remove sulfides in crude concentrate, and finally cassiterite concentrate was obtained after the flotation tailings were treated with tables. The results of closed-circuit experiment were achieved as concentration grade 44.50% and recovery 52.17% when the feeding grade was 0.30%. The results indicated the new flowsheet can fully take advantage of their characteristics and the fine cassiterite can be effectively recovered.
Redesign of the Bucket Wheel Excavators Substructures Based on the Comparative Stress – Strain Analysis
Authors: Bošnjak Srdjan M. , Petković Zoran D. , Zrnić Nenad Đ. , Dunjić Momčilo M. , Dragović Branislav M.
Published: December 2011

Failures caused by heavy duty conditions, as well as the changes of technological requirements, are basic reasons for the redesign of specific substructures of the bucket wheel excavators (BWE). The efficient redesign should be based on subtle external load identification and sufficient accuracy of stress – strain states determination. This paper gives solutions of reconstruction and comparative stress analyses for original and redesigned representative and vital BWE subsystems - slewing platform, undercarriage and two wheel bogie. The efficiency of these reconstructions is unquestionably confirmed by failureless service of mentioned subsystems.
Experiment Research of Electric Analogy for Multi-Lateral Wells Considering Frictional Pressure Drop in Wellbore
Authors: Zhu Ming , Wu Xiao Dong , Han Guo Qing , Yuan Yu
Published: December 2011

A series of electric analogy experiments are designed based on the water and electricity similarity principle and frictional pressure drop in wellbore. The contribution of every branch of the multi-lateral well on oil production and the impacts of the number and the angle of branches on productivity has been studied. The results show that the productivity increases as the number and the angle of branch increases, but the increasing tendency slows down. The interference between the horizontal hole and the branch on the side with fewer branches is less than that of the other side. Experimental results provide the basis for optimizing morphology of the branch wells.
The Impact on Athlete Health of Sulfate, Nitrate and Ammonium in Atmospheric Aerosol in the Urban Area of Yangtze River Delta, China
Authors: Jiang Bin
Published: December 2011

In this paper, aerosol samples were collected with Andersen cascade sampler on typical polluted days at residential area in Hangzhou, China. The concentrations of sulfate, nitrate and ammonium in aerosol were analyzed by the ion chromatography. Results showed the concentrations of SO42-, NO3- and NH4+ on polluted days were 21.4, 31.2 and 10.8µg m-3 in fine particles, respectively, and were 1.3-1.7 times higher than on unpolluted days. SO42-, NO3- and NH4+ in fine particles were the main threat of athlete health in the urban area of Yangtze River delta.
Utilizing Urban Rain-Flood Based on Nano Technology
Authors: Yan Jun , Zhang Ju , Chen Sai Nan , Jiang Chang You
Published: December 2011

Urban Rain-Flood disasters become more ordinary and serious recently under global warming and unreasonable exploitation. Summed up the characters of urban rain-floods, the mechanism of urban rain-flood disasters is analyzed. More ever, the main countermeasures to utilize urban rain-flood based on Nano technology comprehensively and effectively are put forward.
A Model of Threshold for the Two Stock Market Returns: Study of the Stock Markets in Switzerland and Canada
Authors: Horng Wann Jyi , Tsai Ju Lan
Published: December 2011

The empirical results show that the dynamic conditional correlation (DCC) and the bivariate asymmetric-IGARCH (1, 1) model is appropriate in evaluating the relationship of the Switzerland’s and the Canada’s stock markets. The empirical result also indicates that the Switzerland. and the Canada’s stock markets is a positive relation. The average estimation value of correlation coefficient equals to 0.4685, which implies that the two stock markets is synchronized influence. Besides, the empirical result also shows that the Switzerland and the Canada’s stock markets have an asymmetrical effect, and the variation risks of the Switzerland and the Canada’s stock market returns also receives the influence of the good and bad news.
Three Positive Periodic Solutions of Nonlinear Functional Differential Equations with Impulse Effects
Authors: Wang Lei
Published: December 2011

In this paper, a type of nonlinear functional differential equations with impulse effects are studied by using the Leggett-Williams fixed point theorem.
Uniform Phosphor Spheres of Diverse Emission Colours via Homogeneous Precipitation
Authors: Li Chang Fa , Li Ji Guang
Published: December 2011

Basic carbonate monospheres of various lanthanide combinations are successfully synthesized by the urea-based homogeneous precipitation technique, which are then converted into well dispersed phosphor particles that emit diverse colours. Sequential precipitation is commonly observed for these mixed cation systems, calling for adequate annealing of the basic carbonate precursors to attain cation homogenization in the final oxide particles and thus better luminescence, through eliminating localized concentration quenching of luminescence. It is shown that, owing to their excellent dispersion and uniform size, the phosphor spheres are readily assembled into close-packed luminescent films, allowing their wide applications in white LEDs, plasma display panels (PDPs), and field emission displays (FEDs).
The Biotechnology for Odours-A Review
Authors: Deng Zhi Hua , Ning Ping , Zhou Cheng , Huang Jian Hong , Yang Kui
Published: December 2011

This article provides an overview about the microbes selecting, types of bioreactors, the treatment condition, etc. which influence the odors abatement effect. In the recent past, many highly efficiency microorganisms on the actual governance of malodorous gases have been selected and trained. Among different bioreactor configurations, biofilters, biotrickling filters and bioscrubbers are most common ones. The membrane bioreactor and the three phase fluidised bed bioreactor as new bioreactors have broad development prospects. Finally, this review also provides how to insights into future R&D needs in this area.
Theoretical and Empirical Research on Knowledge Talented Person Flow Hexie Management
Authors: Zhang Xiang Qian , Liu Xuan
Published: December 2011

Knowledge talented person flow frequently. It discusses various results of knowledge talent fluxion through Environment, Organization, Leadership and the Human nature (EOL-H).In addition, the thesis also proposes that He Principle means the provision of attractive soft and hard environments by organizations in order to increase their competence concerning talent attraction.
An Improved Data-Aided Symbol Timing Algorithm for OFDM Systems
Authors: Zhao Xiao Yan
Published: December 2011

Synchronization is very important to orthogonal frequency division multiplexing (OFDM) systems. Taking aim at the problem that the timing inaccuracy of the S&C method and the indistinct peak of the timing metric produced by Park method under the low signal-to-noise ratio (SNR) and fading channel, a new symbol synchronization algorithm based on the training symbol is proposed in this paper. The new algorithm exploits the training symbol proposed by S&C to correlate the received signal with the known training symbol again at the receiving end to identify the start point of the OFDM symbol. The result of the simulation shows that the proposed method’s timing metric is of the impulse-shaped peak under the condition of the lower SNR and multipath fading channel, and has smaller timing errors compared with the conventional method in terms of mean-square error (MSE) of the timing estimator.
Design of Data Acquisition System Based on FPGA
Authors: Xu Guo Sheng
Published: December 2011

A new kind of data acquisition system is introduced in this paper, in which the multi-channel synchronized real-time data acquisition under the coordinate control of field-programmable gate array(FPGA) is realized. The design uses field programmable gate arrays(FPGA) for the data processing and logic control. For high speed CCD image data processing, the paper adopts regional parallel processing based on FPGA. The FPGA inner block RAM is used to build high speed image data buffer is put into operation to achieve high speed image data integration and real-time processing. The proposed data acquisition system has characteristics of stable performance, flexible expansion, high real-timeness and integration
The Active Power Filter Research Based on ANN Harmonic Detection and PR Control
Authors: Wang Dong Fang , Liu Qian Jin , Xu Bao You
Published: December 2011

This article proposed the adaptive harmonic detection based on artificial neural network，and which can test the amplitude and phase of all the harmonics. This paper also proposed the quasi-resonant control ratio strategy of active power filter. This strategy can compensate a specific harmonic of power system in real time, can achieve Static error-free control and with a strong ability of anti-grid frequency fluctuations. The results show that the method is feasible and effective.
The Construction of Customer Satisfaction Index for Government Portals
Authors: Guo Shu Xin , Yu Jin Huan , Zhao Cheng Li
Published: December 2011

This article takes government portals as study object, consults the domestic and overseas study in customer index testing which especially comes form America, and according as the characteristics of the services in government portals , to construct a theory model for government portals customers satisfaction index testing ,and build a assorted index testing system for it. On the basis of that, according to the structural equation theory and algorithm, built a model bases on the structural equation for the government portals customer satisfaction index testing, effectively solved the problem that how to test the government portals customer satisfaction, gives a useful reference for the build of government portal in the future.
The Design and Research of the Next Generation of ERP Based on GPS and GIS
Authors: Ye Ke , Guo Yong
Published: December 2011

Using GPS and GIS technology, the next generation of ERP (Electronic Road Pricing) system, are designed in this paper. The structure and approaches of the system has also been presented. The next generation of ERP system has resolved the issues of traditional ERP system, such as, high cost, unavailable for wide range of application. And, The new system not only more consistent with road pricing principles and objectives of reducing traffic congestion and air pollution, but also more flexible for the integration of ERP system with other Intelligent Transportation Systems (ITS). The paper also elaborated the key technical issues of the system.
The Application of Remote Sensing Technology in Geohazard Prevention & Mitigation, Water Conservancy Engineering and Transportation Engineering
Authors: Xin Yu , Lin Qiu Sheng , Zhang Xin
Published: December 2011

The remote sensing (RS) technology is a synthetic detecting technology and has been developed very quickly for recent years. As its main features, the RS technology could help to acquire data in multiple means, wide range, quick speed and high precision. Now it has been applied comprehensively in such area as geohazard prevention & mitigation, water conservancy engineering and transportation engineering. The application of RS technology in these areas was introduced in this paper. The future application was also prospected.
Research on De-Noising of Ultrasonic Detection Signal via Multiwavelets with Different Preprocessing Methods
Authors: Zhou Xi Feng , Suo Hui Ying , Guo Qian Gang
Published: December 2011

On the basis of introducing multi-wavelet theory, a new soft-threshold function is proposed, and the de-noising effect of Ultrasonic signal is investigated by adopting different preprocessing methods of various multi-wavelet. An improved matrix preprocessing method is proposed for GHM also. Simulation results indicate that the selection of a proper preprocessing method is important for multi-wavelet de-noising. Therefore, it is of great importance to choose a suitable preprocessing method and multi-wavelet in order to obtain a better de-noising effect.
Research on Application of Web Mining in E-Commerce
Authors: Bin Ning , Yuan Lei
Published: December 2011

As one of the most valid method of solving the status of “data explosion”, and “information lack” that current enterprise information systems are faced with, data mining is paid maximum attention to the academia and enterprise. This paper centers on the application of Web Mining, combines the features of E-commerce and sets forth data resources, basic methods, system construct and typical applications of data mining in electronic commerce in detail.
A Novel Approach for Thinning & Skeletonization Using Preprocessing Methods
Authors: Vanajakshi B. , Reddy L. Pratap
Published: December 2011

Preprocessing is an operation with images at the lowest level of abstraction. Many preprocessing steps are used in the generation of images for a better quality. Skeletons are important shape descriptors in object representation and recognition. The present paper investigated how different skeletons (thinning and skeletonization) are going to be affected on various preprocessing methods. The experimental results on different images indicate good comparison of variation of skeletons on different methods of preprocessed steps.
Set-up the Complicated Module of the Embedded Software and Research the Orthogonality of the Structure
Authors: Yang Zhu , Zhu Xiao Long , Yuan Shuai , Liu Qing Shan
Published: December 2011

Designed the car DVD/GPS integrated navigation system video used ARM11 processor, multi-task on the system structure and operation carried out under the research to orthogonality for software construction and design guideline, orthogonal software system are summarized design ideas and organizational structures and orthogonal software design benefits. It is useful to the practical application of DVD / GPS integrated navigation system software audio construction and design.
Traveling Wave Solution of (3+1) Dimensional Potential-YTSF Equation by Bernoulli Sub-ODE Method
Authors: Feng Qing Hua
Published: December 2011

In this paper, we derive exact traveling wave soluti-ons of (3+1) dimensional potential-YTSF equation by a proposed Bernoulli sub-ODE method. The method appears to be efficient in seeking exact solutions of nonlinear equations. We also make a comparison between the present method and the known (G’/G) expansion method.
Research on the New Assessment Model of Water Source Quality Based on Maximum Entropy Principle
Authors: Lu Ren Qiang
Published: December 2011

Water source quality is the crucial factor to determine the safety and reliability of urban water supply, and the effective water quality assessment is the premise for water source conservation. Taking a lake system as an example, firstly, the maximum entropy principle was used to analyze the evolution mechanism of the structural changes of lake system. And the nonlinear coupling between the different subsystems of lake system was also analyzed. Secondly, the Self-Organizing feature map neural network was used to simulate the dynamic evolution process of lake system. Finally, a new assessment model for water source quality was established based on the maximum entropy principle. Through application it found that this model achieved the quantitative evaluation of water source quality effectively, and surmounted the inadequate that the precious water quality assessment methods had to determination the weights of the different water quality indicators subjectively.