bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Pore-Formers on the Performance of YSZ/NiO Composite Material
Authors: Yi Zhong Zhou , Sun Hong Yan , Liu Yi Ming , Zhai Feng Rui
Published: December 2012

YSZ/NiO composite powders were successfully synthesized by chemical liquid phase co-precipitation process. YSZ/NiO composite ceramic bodies were prepared by gel casting. Three different types and amounts of pore-formers were added into the YSZ/NiO suspension. The results show that the YSZ/NiO composite with the best properties and optimal porosity of 42.18% was obtained when the 7wt.% corn meal was used as pore-former.
Preparation and Conductivity Properties of Ta5+ Doping BaCeO3 Ceramics
Authors: Tang Chao , Fang Ming Hao , Huang Zhao Hui , Liu Yan Gai
Published: December 2012

Doping perovskite structure ceramics constitute an important type of solid oxides fuel cell (SOFC) cathode materials. In this study, BaCe1-xTaxO3+δ powders were prepared by solid state reaction at 1500oC for 4h. BaCe1-xTaxO3+δ ceramics were pressureless sintered at 1600oC for 5h. The results indicated that the relative density of BaCe1-xTaxO3+δ ceramics reached the range of 84.15 - 90.88%. At the frequency of 1Hz, the conductivity of BaCe0.65Ta0.35O3+δ ceramic samples varied greatly, when the testing temperature rose from room temperature to 900oC in increments of 100oC. The highest conductivity was obtained at 600oC with the value of 6.74×10-5 S/cm.
Fabrication of Lithium Silicate Doped with Lithium Titanate by Solid-State Reaction and its XRD Study
Authors: Wang Yu Tian , Cao You Dong , Hu Jin , Zhang Wei Jun , Wu Da Ping , Shen Li
Published: December 2012

Fabrication of lithium silicate powder containing lithium titanate by solid phase reaction method. LiFabrication of lithium silicate powder doped with lithium titanate by solid-state reaction. Take lithium carbonate, silicon dioxide and titania as raw materials and then these powders were mixed according to the different ratios and grinded in an agate mortar for 15 min. And then the mixture were dried at 80°C. Finally, the samples were sintered in vacuum tube furnace at 750, 800, 850 and 900°C for 2h. Thermogravimetric analysis, differential scanning calorimetry and XRD analysis were carried out systematically in this paper. The reaction process and mechanism at different temperatures and the effect of the different ratios and sintering temperature were discussed. Experimental results showed that lithium titanate component increased with increasing amount of titanium dioxide. While the mixture were sintered at 900°C for 2h, there would have lithium silicate and lithium titanate phase.
Effect of Resin Cements for Porcelain Veneers on the Color Stability after Accelerated Ageing
Authors: Ai Jun , Shao Long Quan , Zhou Shan Yu , Wang Lin Lin , Hu Chen , Deng Bin , Wen Ning
Published: December 2012

To assess the color stability of different resin cements after accelerated ageing. Four different resin cements were included in the study (1mm thickness). The resin cements were bonded to ceramic disks (0.5mm thickness) built with the VITABLOCS MARK-Ⅱ ceramic (n=7). All of the samples were stored in 37°C distilled water at dark. Then color measurement were determined using spectrophotometric before and after accelerated ageing in a weathering machine with a total energy of 150kJ/m2. Changes in color (ΔE) were obtained using the CIE Lab system coordinates where a ΔE data above 3 was accepted as visible discoloration. The ΔE of Superbond C&B, RelyX ARC, Variolink Veneer and Tetric Flow were 2.24±0.52, 2.47±0.28, 0.62±0.31 and 0.72±0.31 respectively. The Superbond C&B and RelyX ARC achieved significant higher ΔE than the other groups (P0.05). All of the resin cements assessed in this study show varying degrees of discoloration after accelerated ageing. However, the color change are not beyond the clinical aesthetic demand. And the Tetric Flow and Variolink Veneer demonstrate a higher color stability.
Preparation and their Fluorescent Property of Sm2Zr2O7 and Sm2(Zr0.7Ce0.3)2O7 Powders
Authors: Chen Xiao Ge , Zhang Hong Song
Published: December 2012

Pure Sm2Zr2O7 and Sm2(Zr0.7Ce0.3)2O7 nano powders were prepared by sol-gel method using zirconium nitrate and samarium nitrate as raw materials, citric acid as solvent and dispersant. The synthesized powders were characterized by XRD, Ft-IR, BET, SEM and Emission spectra. The effect of thermal temperature on particle size of the nano-powders were studied and single phases of Sm2Zr2O7 and Sm2(Zr0.7Ce0.3)2O7 were completely formed at 900°C. The obtained powders consist of abnormal particles with agglomerated structures in size range 7-10nm. Moreover, the strong fluorescent properties of the synthesized products show that these two kinds of powders are potential fluorescent emitted materials.
Comparing Study on Translucency of Four Veneered Dental All-Ceramic Core Materials
Authors: Lu Rong Jian , Wang Cheng Long , Xu Juan , Yi Yuan Fu , Shao Long Quan , Wen Ning , Gu Bin , Liu Yi Han , Deng Bin
Published: December 2012

This study aimed to compare the translucency of four veneered dental all-ceramic core materials,including IPS e.max Press,Zenostar,Lava Zirconia and Upcera Zirconia.All specimens were fabricated at 10mm in diameter and 1.00.01mm in thickness.The translucency of specimens were measured with color difference meter and measurements were statistically analysed with SPSS 13.0. Experimental results showed that their translucency had significant difference,the order of relative translucency from high to low was IPS e.max PressLava ZirconiaZenostarUpcera Zirconia.IPS e.max Press which has good optical effect may be preferable for restoring anterior tooth with higher translucent. As for relatively opaque posterior tooth,Upcera Zirconia may be advisable.
Phase Behavior Analysis of Low-Grade Bauxite and Rutile by Carbothermal Reduction-Nitridation
Authors: Yang Tao , Liu Yan Gai , Ye Ding Yun , Wang Qi , Huang Zhao Hui , Fang Ming Hao
Published: December 2012

In this study, β-Sialon/Al2O3/TiN diphase powder was synthesized using low-grade bauxite and rutile via carbothermal reduction-nitridation. The phase transitions of low-grade bauxite and rutile in the carbothermal reduction and nitridation process were analyzed by XRD, SEM and EDS. The effects of different reaction parameters such as reaction temperature, rutile addition on the phase composition and microstructure of products were analyzed. The results showed that β-Sialon/Al2O3/TiN powder was prepared using low-grade bauxite and rutile as raw materials and coke as reducing agent by carbothermal reduction-nitridation reaction in flowing nitrogen atmosphere of 0.03 MPa at 1350-1375 °C, for 4 h.
Synthesis and Luminescent Properties of Na5LaxM1-x(WO4)4 (M = Eu, Sm, Bi) Red Phosphors for WLED
Authors: Huang De Cai , Zhou You Fu , Xu Wen Tao , Yang Zhang Fu , Hong Mao Chun , Lin Yuan Hua , Yu Jian Chang
Published: December 2012

A series of Na5La(WO4)4:M3+ (M = Eu, Sm, Bi) phosphors have been synthesized successfully by the solid-state reactions. The corresponding crystal structure and lattice parameters were refined by the Rietveld method, and the impact of doped metal ions upon the structure were also studied. The photoluminescent properties were investigated at room temperature. All the samples were observed a strong red emission under 395nm or 465 nm excitation, and the CIE chromaticity coordinates (x = 0.67, y = 0.33) was found to be close to the National Television Standard Committee (NTSC) standard red, implying high color purity. This kind of tungstate phosphor is a promising candidate as the red phosphor for white light-emitting diodes (WLED).
Effect of Cu on the Microstructure and the Property of Al-Ce-Ni-Cu Amorphous Nanocomposite Materials
Authors: Zhang Hong Wei , Zhang Can Bang , Zhang Li Li , Zhai Feng Rui , Tian Jia Jin
Published: December 2012

Preparing amorphous alloy of Al87Ce3Ni10-xCux（x=0,1,3,5）with single roller spin quenching technology, after annealing the alloy for 20 minutes at 180 degrees Celsius, 200 degrees Celsius, 220 degrees Celsius and 240 degrees Celsius, and then the nanocomposites can be obtained. he microhardness of amorphous nano-composite materials are measured .The microstructure, grain size of , thermal stability, midrohardness are related with the annealing temperature and the composition of alloy, and studying the relationship between them by X-ray diffraction (XRD) and differential scanning calorimetry (DSC).The present results indicated that with the increase of the content of Cu, the grain size of decreases, the increasing of the microhardness is due to the grain refinement: with the increase of the content of Cu, precipitation temperature of moves to low, which is helpful for the precipitation of phase.
Preparation and Characterization of LaAlO3 via Sol-Gel Process
Authors: Zhang Xiao Yan , Zhang Teng , Qi Xi Wei , Qi Jian Quan , Sun Gui Fang , Chen Huan Huan , Zhong Rui Xia
Published: December 2012

Lanthanum aluminate powders were synthesized by sol-gel process with metal nitrates as raw materials, 2-methoxyethanol/water as solvent and citric acid as chelating agent. The influence of this techniques (the amount of citric acid, pH value, calcination temperature and the ratio of 2-methoxyethanol/water) on the lanthanum aluminate powders were studied. The XRD shows pure LaAlO3 powders could be obtained after calcining at 600-900 °C. The SEM analysis indicates that the LaAlO3 particles are uniform and nanosized with a range of about 40-70 nm, which is slightly larger than the estimated particle size using Scherrer formula.
Studies on Friction and Mechanical Properties of High Density Polypropylene (HDPP) Filled with Modified Talc
Authors: Zhan Feng , Chen Nan Chun
Published: December 2012

Talc was modified by aluminate coupling agent (ACA) before filling it into high density polypropylene (HDPP) to prepare talc/HDPP composites. Scanning electron microscopy (SEM), wear testing machine, electronic universal testing machine, and impact testing machine were used to analyze the surface modification and the effects of modified talc on friction and mechanical properties of modified talc/HDPP composites. The results indicate that after modified the lamellar structure of talc particles are open and the dispersion of particles are improved, and the edges and corners of surface become softer. Friction properties indicate that when the talc content is 8 wt%, both µ and K are at a lower value, which show that have better wear resistance. The frictional surface is relatively smooth and no furrow trace has found. Mechanical properties show that with talc content increasing, tensile strength and flexural strength of composites increase.
Study on Preparation Zeolite X from Stellerite
Authors: Zhang Xiao Hu , Chen Nan Chun
Published: December 2012

Natural Stellerite has a big reserve volume, but has some shortcomings which are irregular ducts and Connotation impurities and so on. So, it is necessary to use Stellerite to prepare zeolite X for enhancing purity and property. It tests Products by XRD, FT-IR and Stereo Microscope. The study shows that optimum parameter is n(SiO2)/n(Al2O3)=3, n(Na2O)/n(SiO2) =1.1-1.2 and n(H2O)/ n(Na2O)=30-40. The gel ages at room temperature for 12 h, and then keeps at 95 °C for 7h. The pure zeolite X could be prepared.
The Effect of Substrate Volume on the Catalytic Behavior of Pd/Rh Three-Way Catalysts
Authors: Zhang Wei Jun , Hu Jin , Duan You Yan , Duan Yun Biao , Su Lin , Zhao Na
Published: December 2012

In this paper, Pd/Rh series catalyst substrate samples were prepared at the same cell density, with different volume. The fresh catalyst aging treatment. And Catalyst test by light-off factor (LOF). The results tested demonstrated that, for the same cell density of substrate, the increase of substrate volume benefited to obtain lower light-off temperature. It was effective measurement that higher cell density enlarged the operating window of catalyst. When the volume of substrate increased by 40%, catalyst light-off temperature decreased 5～10°C, the range of the air-fuel ratio is enlarged in 0.43. And it is role equivalent to the density of the cell density in additive quantity of 50% or Pd/Rh in additive quantity of 20%.
Study on the Low-Emissive Camouflage Pigment
Authors: Shen Feng Chuan , Feng Xin Xing , Ma Tian , Zhang Jian Chun , Zhang Hua , Gao Peng Gang
Published: December 2012

A low-emissive pigment of Al/SiO2/Fe2O3/FeO/Fe4[Fe(CN)6]3/Cr2O3/Cr (MAS) was prepared by chemical deposition method. The camouflage characteristics of the coated fabric with paint mixed with MAS, binder and other auxiliary in the thermal infrared (IR 8~14 um) and the optical (0.38~1.2 um) region, was studied by emissivity tester, visible light camera and thermal infrared imager. The results show that the MAS pigment has low emissivity and optical camouflage effectiveness compared with the Al/SiO2 pigment. Particularly, the MAS pigment is in green by depositing metal oxide, ferrocyanide and pure metal on the surface of Al/SiO2. The optical reflectance spectrum of coated fabric was similar to the natural grass. Furthermore, the surface emissivity of the coated fabric reached 0.51 in the IR region. The thermography of the coated fabric with 4 wt% MAS was similar to the natural grass. It can conclude that the coated fabric can perfectly imitate grass background.
Preparation of Fibrous Basic Magnesium Chloride Single Crystal
Authors: Ren Qing Li , Luo Qiang
Published: December 2012

The preparation of fibrous basic magnesium chloride single crystal was investigated. And the fibrous basic magnesium chloride single crystal samples were prepared by liquid reaction method at the atmospheric pressure. Based on the test results of SEM, TEM diffraction and XRD, the effects of the mole rate of calcium hydroxide to magnesium chloride, reaction temperature, mixing time and ripening time on the preparation of the fibrous basic magnesium chloride single crystal are discussed. And based on the output and the length of the fibrous, the best technological conditions for preparing the fibrous basic magnesium chloride are as follows: (1) the mole rate of calcium hydroxide to magnesium chloride is between 0.35 and 0.4; (2) the reaction temperature is 45 centigrade temperature degree; (3) the mixing time is between 2 hours and 5 hours; (4) the ripening time is between 24 hours and 36 hours. The fibrous basic magnesium chloride single crystal, whose length is about between 30µm and 100µm and whose diameter is about between 0.2µm and 1µm, is obtained.
Morphology Control of the Nano-MnO2 by Microwave Hydrothermal Synthesis
Authors: Zhang Shi Lei , Niu Ben , Qi Enlei , Wang Lei , Wang Jie Qiang
Published: December 2012

In this paper, KMnO4 was used as raw material, nano-MnO2 with different morphologies such as flowers globular, hollow tubular and rodlike were obtained by the microwave assisted hydrothermal synthesis under the acidic condition. The crystal structure and morphology of the resultant MnO2 were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM), respectively. The elements and content of samples were tested by Energy Dispersive Spectrometer (EDS). The influence of reaction temperature and holding time on crystal forms and morphologies of the MnO2 was analyzed.
Influence of Nitrogen Pressure and TiN Addition on Combustion Synthesis of Ti2AlN Powders
Authors: Tian Jia Jin , Zhai Feng Rui , Zhang Li Li , Zhang Hong Wei , Yi Zhong Zhou
Published: December 2012

It has a relatively rapid reaction with self-propagating combustion method to synthesize Ti-Al-N powder. This can effectively avoid uneven phenomenon of aluminum melting reunion during the reaction of raw materials. So you can use lower-cost aluminum as raw materials. In addition, the combustion synthesis method also has a simple process and low-cost advantage. Thus this method has the potential to become the optimum process method to prepare Ti2AlN and Ti4AlN3. In this paper, Ti, Al elemental powders and N2 were used as raw materials. The powder of Ti2AlN was successfully prepared for the first time by combustion synthesis method. This substance is a nitrogen compound of single-phase and three yuan. The results from the XRD diffraction analysis and SEM show that synthetic product is high purity Ti2AlN with a small sample to combustion synthesis when the pressure of nitrogen is in 5 MPa, but the content of synthesis products Ti2AlN is small when the sample is magnified, and the TiN and AlN has a higher content. It can burn synthetic Ti2AlN to control the nitrogen pressure and add the amount of TiN, and the pressure of N2 is better 2 MPa, and the amount of TiN added is better 30 wt.%.
Morphology-Controllable Synthesis and Characterization of ZnMoO4 Nanoparticles
Authors: Jia Run Ping , Zhang Cheng , Xu Jia Yue
Published: December 2012

In this work, nano-sized zinc molybdate (ZnMoO4) with several morphologies were prepared through introducing different template agents into hydrothermal system, in which ZnCl2 and Na2MoO4 were used as raw materials. Their structures and morphologies were characterized by XRD, FTIR and SEM techniques. Results showed that after constant temperature of 150°C for 4h, ZnMoO4 nanoparticles (~ 200 nm) were obtained in water medium. While in citric acid, CTAB and EDTA reaction templates, corresponding products were needle-like (400 nm *4000 nm), plate-like(350 nm*1500 nm*2000 nm) and microflower-like assembled by nanorods (300 nm*600 nm), respectively. All of them were monoclinic wolframite-type structure, and their photoluminescent (PL) spectra were also observed.
Synthesis of Water-Soluble Fe3O4 Nanopowder and its Cr(VI) Adsorption Properties
Authors: Wan Hong Liang , Deligeer W. , Zhao Si Qin , Asuha S.
Published: December 2012

In this work, water-soluble Fe3O4 nanopowder with mesoporous structure was prepared by the thermal decomposition of Fe-urea complex ([Fe(NH2CONH2)6](NO3)3) in triethylene glycol (TEG), and the effects of reflux time and the concentration of precursor on the properties of Fe3O4 nanopowder were investigated. In addition, the adsorptive properties of the material were studied using Cr(VI) as a target pollutant. Prolonging reflux time and increase in concentration of [Fe(NH2CONH2)6](NO3)3 in TEG can effectively improve the crystallinity and magnetic properties of the Fe3O4 nanopowder. The saturation magnetization (Ms) increases from 21.4 to 48.5 emu/g when the reflux time increases from 2 to 20 h. The maximum adsorption capacity of the Fe3O4 nanopowder for Cr(VI) is estimated to be 21.6 mg/g.
Synthesis and Characterization of Graphene/Cu2SnS3 Quantum Dots Composites
Authors: Li Cai Xia , Guo Jun , Jiang Danyu , Li Qiang
Published: December 2012

In this paper, employing Cu(AC)2•H2O, SnCl2•2H2O and thiourea as raw materials, the composites of graphene/Cu2SnS3 quantum dots (QDs) were prepared simply and quickly using the hydrothermal method. Meanwhile, the separate Cu2SnS3 QDs were also synthesized in the same way. The as-obtained Cu2SnS3 QDs and composites’ phase structures were analyzed and characterized by powder X-ray diffraction (XRD), and the results indicated that the size of the Cu2SnS3 QDs in the composites were less than that of the separate Cu2SnS3 QDs. At the same time, their morphologies were also observed and cross-confirmed by Transmission Electron Microscopy (TEM), and the measurements manifested that Cu2SnS3 QDs were uniformly dispersed on the surface of the graphene, while the separate Cu2SnS3 QDs have obvious glomeration. In addition to this, elemental analysis was also made to verify the existence of Cu2SnS3 on the surface of graphene.
Preparation of Macroporous Ceramics Using Agar Gelcasting Foam Method
Authors: Cai Qun , Zhai Feng Rui , Li Jun Sheng
Published: December 2012

Gel casting foam is a novel method which was developed in latter 1990s for the fabrication of porous materials with regular round pores and a relatively high flexural strength. It also has the advantages of simplicity in degreasing processing and short production cycle. However, the gelating system used in this method commonly contains acrylatnide, which is toxic and sensitive to oxygen, due to which, foaming and polymerization of the substance have to be performed in an oxygen-free environment. In this work, we use agar as the gelating agent in replace of acrylatnide to prepare alumina macroporous ceramics. The effects of foaming speed, foaming time, gelating time and valeric acid on the pore diameter of the sample were investigated. Results show that the average pore diameter increasing with the foaming speed, but decreasing with the increasing foaming time. Moreover, the addition of valeric acid reduces the bubble size during foaming and increase the stability of the foams. By controlling the foaming and gelating conditions, we achieve alumina macroporous ceramics with regular round pores of over 100μm by this method.
Fast Fabrication and Wear Behavior of Alumina–Nickel Composites
Authors: Meng Fan Cheng , Zhang Xiao Lei , Zhang Ying , Liu Cheng , Dong Ya Bo , Tian Zhong Qing , Huang Wei Jiu
Published: December 2012

Alumina matrix composites containing 20 wt % of Ni was sintered by spark plasma sintering (SPS) process. The influence of sintering temperature (1400-1550 °C) on densification and grain size of the composites were investigated (heating rate: 200 °C /min, sintering time: 5 min). Wear behavior of samples obtained by SPS were evaluated in a dry condition with reciprocate ball-on-disk testing machine. The results show that the relative density and alumina grain sizes increase with the increasing sintering temperature, and the fine-grained structure (alumina size controlled in 1–2 µm) are obtained at a temperature lower than 1400 °C; the alumina grain sizes increase to 5 µm at a temperature higher than 1500 °C. The fine-grained structure samples exhibits higher wear resistance.
Hydrocyclone Two Phase Flow Experimental Research Based on Fluid Mechanics
Authors: Xu Hui , Chen Xiao Hong
Published: December 2012

The liquid phase experiment is finished ,and the relation curve of input- pressure and input-flow、output-flow、distributary rate are worked out.We are bout to calculate the production capacity and define the best distribution rate of the operation parameters.At the same time , the solid-liquid phase separating experiment are made too and we conclude the relation curve of input-pressure and consistency 、separating efficiency .Comparing with the numerical simulation ,the result is reasonable.
Research on the Initial Disturbance of Vehicular Missile with System Vibration Analysis
Authors: Zhang Chong , Jiang Yi
Published: December 2012

This paper is based on the complex multiple vehicular missile launch simulation model, researches the influence of combustion jet flow to the initial disturbance of missile. It establishes rigid-flexible coupling dynamic model by use of Adams and Ansys, and calculates the value of combustion jet flow field in missile box by means of Fluent. The rigid-flexible coupling dynamic simulation for the whole launch process is carried out. The study results show that the simulation with loading jet flow can accurately tend to real launch environment, it has great significance to optimize the simulation and to improve the accuracy of the simulation.
Heat Design of Multi-Functional Structure of Electronic Equipment with Material Properties in Control System
Authors: Wu Jun Hui , Zhou Quan , Zhou Qiang , Chen Jie , Si Hui Ping , Lin Kai Yan , Zhang Chi Bin
Published: December 2012

In this paper, the multifunctional structure was designed in electronic equipment of the control system, reducing the weight in the housings of the electronic equipment, wire and cable. The functions of thermal design and dynamic design and protection design were completed by using structure. The qualitative analysis of the center control unit structure model was done. Thermal analysis and the thermal design of the multifunctional electronic equipment structure were finished on the basis of the thermal design principles and attention of the matters. The cooling capacity was increased by fin structure with the cold plate. The modeling analyses of the same multi- functional structure with different fin spacing and height were completed in Icepak. The curves of the maximum temperature for the multi-functional structures corresponding to a group of fin height were got. The high-power MCM chip was placed in the middle of the multifunctional structure, and the remaining low-power chips were distributed around, which can reduce the thermal coupling of the chip, reducing the overall temperature of the multi-functional structure effectively, which has certain theoretical significance to the design of today’s electronic devices.
Microstructure and Mechanical Properties Analysis of AL-5052 Self-Pierce Riveting Joint in Material Application Engineering
Authors: Xu Jing Nan , He Xiao Cong , Tang Yong , Ding Yan Fang , Hu Yue Bo , Zeng Kai
Published: December 2012

As one of the most important technology of Lightweight of Automobile, Self-pierce riveting (SPR) is suitable for joining similar or dissimilar sheet materials. In this paper, the process of the SPR was introduced, the test specimen was prepared by using electrolysis and anodized coated, and the microstructure of the joint is observed by the differential interference contrast method (DIC). According to the distribution of the grain size, the section of the joint could be divided into five areas, un-deformed matrix, upper plate self-locking area, lower plate self-locking area, upper plate transition area, and lower plate transition area. From transition area to matrix the grain deformation and hardness decreases gradually, and the maximum hardness of the joint was founded in the upper plate self-locking area.
Nonlinear Vibration of Functionally Graded Material Cylindrical Shell Based on Reddy’s Third-Order Plates and Shells Theory
Authors: Dong Lu , Hao Yu Xin , Wang Jian Hua , Yang Li
Published: December 2012

In this paper, an analysis on nonlinear dynamics of a simply supported functionally graded material (FGM) cylindrical shell subjected to the different excitation in thermal environment. Material properties of cylindrical shell are assumed to be temperature-dependent. Based on the Reddy’s third-order plates and shells theory[1], the nonlinear governing partial differential equations of motion for the FGM cylindrical shell are derived by using Hamilton’s principle. Galerkin’s method is utilized to transform the partial differential equations into a two-degree-of-freedom nonlinear system including the quadratic and cubic nonlinear terms under combined parametric and external excitation. The effects played by different excitation and system initial conditions on the nonlinear vibration of the cylindrical shell are studied. In addition, the Runge–Kutta method is used to find out the nonlinear dynamic responses of the FGM cylindrical shell.
Spectral Properties of the Optoelectronic Material Rhenium (I) Tricarbonyl Complexes with Bipyridine Ligand Containing Triphenylamine Moiety
Authors: Xia Hong Ying , Zhao Feng
Published: December 2012

The photophysical behavior of rhenium (I) complex having a bipyridine ligand with triphenylamidine moiety is investigated using density functional theory (DFT) and time-dependent density functional theory (TDDFT). The complex shows the maximum absorption band at 417.1 nm, with ligand-to-ligand charge transfer (LLCT) character. The lowest lying triplet excited state was localized on3LLCT/ILCT state
Optimization of Sanding Parameters for Wood Surface of Plantation-Magnoliaceae glanca Blume
Authors: Li Xiao Bo , Huang Jing Da , Su Chu Wang , Luo Jian Ju , Lai Lian
Published: December 2012

In order to analyze the relation between wood surface roughness of plantation- Magnoliaceae glanca Blume and sanding parameters, an orthogonal test and a single factor test were performed. The results show that the mesh of the sandpaper has remarkable influence on wood surface roughness of plantation-Magnoliaceae glanca Blumes, but the feeding speed and sanding thickness don’t; when the mesh of the sandpaper is 150, the feeding speed is 6m/min and sanding thickness is 0.6 mm during the first sanding and the mesh of the sandpaper is 320, the feeding speed is 9m/min and sanding thickness is 0.2mm during the second sanding, the smallest roughness (Ra) was obtained as 2.45μm. In the theory optimization scheme, changing feeding speed into 9 m/min with considering production efficiency and changing the mesh of the sandpaper into 240 with reducing consumption of the sandpaper, then engineering optimization scheme was obtained, and the wood surface roughness (Ra) is 2.70μm.
Effects of Surfactant Agent and PTFE Content on Surface Morphology and Microstructure of Ni-P-PTFE Composite Coating
Authors: Fu Chuan Qi , He Xu , Wang Zhou
Published: December 2012

Effects of surfactant, PTFE concentration in plating bath on surface morphology and the microstructure of electroless Ni-P-PTFE composite coatings were investigated in this study. The dependence of microstructure and distribution of PTFE particles in composite coatings upon surfactant agent and PTFE content in the plating bath were reported. Also, effects of ultrasonic frequencies on PTFE content in the coatings were discussed. The surface morphology and microstructure of the composite coatings were analyzed using scanning electron microscope (SEM) and X-ray dialysis (XRD), respectively. The results obtained are indicating that surfactant and PTFE concentration in the plating bath have a great impact on PTFE content in the coatings, the population of PTFE in the coatings proved to increase with increasing surfactant concentration properly. In addition, ultrasonic frequency could change the PTFE content in the coating. The composite coating shows different surface morphology and microstructure in various surfactant concentrations, PTFE concentrations and ultrasonic frequencies.
Specific Rebinding of Protein Imprinted Calcium Polyacrylate/Alginate Hybrid Materials via the Adjustment of pH Values
Authors: Cui Wen Kui , Zhao Kong Yin , Wei Jun Fu , Cheng Guo Xiang
Published: December 2012

Calcium polyacrylate/alginate (CPA/A) hybrid polymer microspheres with the imprinting of bovine serum albumin (BSA) were prepared via Ca2+ crosslinking of sodium polyacrylate (SPA), BSA and sodium alginate (SA) in inverse suspension. The specific rebinding properties of BSA imprinted hydrogel microspheres (CPA/A MIPMs) were investigated by controlling pH value from the viewpoint of adjusting the process of gelling, removing template and rebinding. The optimized pH values in gelling, removing template and rebinding process was 4.1, 8.3 and 4.2, respectively.
Concentrating Elastic Waves by Isotropic Homogeneous and Reflectionless Materials
Authors: Hu Jin , Lu Xiang Yang
Published: December 2012

In this paper, we show that compared with the conventional transformation elastodynamics, the method based on physical interpretation of form-invariance can provide more flexibility in material design. As a result of this flexibility, the impedance-matched condition for both S and P waves in perpendicularly incident cases exists, thus the isotropic homogeneous elastic wave concentrator can be designed. Samples are conceived and validated by numerical simulations.
Preparation and Magnetic Properties of Nanocrystalline (Fe,Cr)-N
Authors: Feng Wen Jiang , Wang Chuan Yin , Zhang Hao Hua
Published: December 2012

The nano-crystalline (Fe,Cr)N was prepared as a single phase by milling Fe80Cr20 in a nitrogen atmosphere. Its crystal structure is determined to be the cubic rock salt-type CrN by X-ray diffraction measurements. The nano-crystalline is stable up to above 773 K and decomposes into (Fe,Cr)N and Fe-Cr solid solution. Due to the combination of Fe atoms and N ones, the intrinsic magnetic moment of Fe atoms is reduced, which is confirmed by our measurements.
Ni Doped LiMn2O4 Prepared by a Flameless Combustion Synthesis
Authors: Liu Gui Yang , Wang Bao Sen , He Ying , Guo Jun Ming
Published: December 2012

In this paper, LiNixMn2−xO4 materials were prepared by solution combustion synthesis method using acetic salts as raw materials and acetic acid as fuel. The phase structures are characterized by X-ray diffraction (XRD). Electrochemical performances of the materials are investigated by galvanostatic charge/discharge methods. XRD results revealed that the main phase of the products with increasing Ni3+ content is LiMn2O4, and there is a trace amount of Mn3O4 found in the product with Ni3+ content of 0.05. Electrochemical experiments showed that the capacity and the cyclability of the LiNixMn2−xO4 materials decrease with increasing Ni3+ content. Ni3+ doping has no significantly improvement for the capacity and the cyclability of the LiMn2O4 spinel.
Phase Structures of LiMn1.95Fe0.05O4 Prepared by Solution Combustion Synthesis and Molten-Salt Combustion Synthesis Methods
Authors: Liu Gui Yang , Wang Bao Sen , He Ying , Guo Jun Ming
Published: December 2012

LiFe0.05Mn1.95O4 materials were prepared by molten-salts combustion synthesis and solution combustion synthesis methods, respectively. The phase structure and compositions of the products were determined by X-ray diffraction (XRD). The main phase of the products prepared by the two methods is LiMn2O4, but at 300-600oC, pure products can not be obtained. At the temperatures of 300 and 400oC, the main impurities are MnO and Mn3O4. The impurities decrease with increasing temperatures, and finally disappear at >500oC. At 500 and 600oC, the main impurity is Mn2O3, but the relative content of Mn2O3 is low.
Influence of Carbon Doping on Microstructure and Tribological Properties of CrN Coating
Authors: Hu Peng Fei , Yin Guo Jie , Zhou Si Kai
Published: December 2012

The influence of carbon doping on tribological properties of CrCN Coating was studied through preparation of coatings deposited on single crystal silicon and M2 high speed steel(HSS) substrate using closed-field unbalanced magnetron sputtering ion plating technique. The friction coefficients were measured by pin-on-disc set-up. The microstructure and bond states of the coatings were characterized by X-ray diffraxtion(XRD), transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). The results show that the friction coefficient of coating decreases from 0.75 to 0.38, the microhardness increases from 1930HV to 2302HV, and the specific wear ratio of the coatings decreases from 8.35110-5m3/Nm to 3.85910-5m3/Nm with the increasing of carbon target current(IC) from 0A to 1.5A. The analysis of microstructure shows that the coatings transform from crystalline state to amorphous state and the grain size of the coatings decreases with the increasing of carbon target current.
Synthesis and Characterization of ZnS Nanoparticles by Using Polyvinylpyrrolidone as Stabilizer
Authors: Fan Xiao Hui , Liu Hong Juan , Chen Yan Ming , Sun Ting
Published: December 2012

A simple synthesis method of PVP (polyvinylpyrrolidone) coated ZnS QDS has been developed. The optical properties and morphology for the as-synthesized ZnS nanoparticles were characterized by UV-Vis absorption spectroscopies and transmission electron microscopy (TEM). The results show that PVP could act as a better stabilizer for the formation of ZnS nanoparticles in N, N-dimethylformamide. The obtained ZnS nanoparticles have spherical morphology and a narrow size distribution. ZnS nanoparticles could give an apparent extionic absorption peaks and quantum confinement effects.
The Experimental Study of Diffraction Angle of Aluminum Alloy 3003
Authors: Duan Neng Quan , Ren Jian Liang , Pang Rui Qiang
Published: December 2012

The most suitable diffraction angle of aluminum alloy 3003 used for stress measuring is aimed to be determined in this paper. The experiment makes a stress measurement of a loading aluminum alloy 3003 equal strength beam with the traditional electrical measuring method and the X-ray stress measurement. With the electrical measuring method as reference, the research study the measured values that acquired from the X-ray diffraction method when the diffraction angle are 142° and 156°, and then compare them with that acquired from electrical measuring method. The measurement results demonstrate that the diffraction angle at 156 ° is better than at 142 ° based on the assessment standards of the liner slope and the distribution of data. Thus the optimum diffraction angle for X-ray to measure the macroscopic stress of aluminum alloy 3003 is 156 °. In this paper，the stress caused by the load on the equal strength beam is assumed to be "residual stress" and thus the conclusion has reference values for the standardization of residual stress measurement of aluminum alloy by XRD and has theoretical guiding significance in the production practices.
Treatment Effect of Coking Wastewater Using Three-Phase Biological Fluid-Bed with New Ultrastructure Biological Carriers Based on Properties of Biological Materials
Authors: Li Na , Liu Hai Biao , Huang Jun Li
Published: December 2012

The degradation of COD and ammonia nitrogen (NH3-N) in coking wastewater was researched using the new ultrastructure biological carriers in three-phase aerobic biological fluid-bed. The results show that the optimum conditions of the new biological carriers are as follows: HRT of 20 h, neutrality skew alkaline pH (about 7.5) and dissolved oxygen (DO) of 2~5mg/L. Under the optimum conditions, the removal efficiency of COD and NH3-N can reach 82% and 87%, respectively, when the influent concentration of COD and NH3-N is about 3000 mg/L and 60mg/L. At the same time, comparison with the activated sludge process and common biological ceramisite carriers, it is found that the most excellent treatment effect and the strongest resistance to impact are obtained under the condition of the shortest HRT in this new ultrastructure biological carriers reactor, and the effluent of two-stage reactors in series can reach the first national discharge standard, which will has a wide application prospect.
Mechanical Analysis on the Splicing Form of Cross-Section Multiple Angle Steel for Transmission Line
Authors: Gao Yuan , Han Jun Ke , Li Qing Hua
Published: December 2012

The stress inside and outside the traditional cross-section angle steel in transmission lines are uneven, resulting in the deviation of the actual carrying capacity and the theoretical design value. This paper proposes the use of improved splicing form of the cross-section angle steel to improve the structure’s mechanical properties. Two spliced forms of cross-section multiple angle steel are analyzed by finite element simulation analysis, so as to compare two different forms’ coordination of component displacement, uniform of force, and stress status on the maximum stress control section. It is pointed out that double angle splicing forms’ displacement compatibility and bearing capacity are better than single angle splicing forms. Especially for towers with different height legs, the maximum stress of the main members of the two splicing forms in the control section is respectively 4.7% and 13.7%.
Determination of Stress-Strain Constitutive Relation of Echelle Grating Al Film by Nanoindentation Test and Simulation
Authors: Shi Guang Feng , Shi Guo Quan , Song Lin Sen , Xu Zhi Wei
Published: December 2012

For the research on elastic-plastic deformation characteristics of the echelle grating in the mechanical ruling depth range, a series of nanoindentation tests are completed about the deposited Al film of available echelle grating with a Berkovich indenter on a CSM nanoindentation instrument. Then a finite element analysis of the nanoindentation process is studied with an orthogonal experiment method for a series of given parameters containing the yield stress and strain-hardening exponent. The optimum combinations of yield stress and strain-hardening exponent are 200MPa and 0.1, which are got by the objective of the least absolute value of maximum loads deviation between the indentation test and the finite element analysis. Finally the elastic-plastic stress-strain curve of power function of the Al film is represented with the difference analysis from the orthogonal simulations.
The Effects of Diffusion and Temperature-Dependent Properties on Generalized Thermoelastic Behaviors in Thermal Dynamics
Authors: Liu Yong Ping , Shi Shuan Hu
Published: December 2012

The generalized thermoelastic diffusion problem with temperature-dependent properties is investigated in the context of the theory of generalized thermoelastic diffusion. The problem is solved by means of finite element method and the derived finite element equations are solved directly in time domain. The effects of diffusion and temperature-dependent properties on generalized thermoelastic wave and mass diffusion wave are studied in detail. The results show that all the considered variables have a non-zero value only in a bounded region and vanish identically beyond this region, the temperature-dependent properties act to reduce all the considered variables and the diffusion barely influences the considered variables.
Study on some Aspects of Breakup Characteristics of Power-Law Fluid with Impinging Jets Based on Mechanics Properties
Authors: Wang En Dong , Yin Yan , Du Qing
Published: December 2012

Shear-thinning power-law fluid is a kind of non-Newtonian fluid in which the viscosity is a function of shear rate. Impinging jets system is used to study the breakup characteristics of power-law liquid sheets formed by two symmetrical round jets in this study. High quality images are obtained from the experiment with a high speed camera and breakup length is extracted from the images. Closed-rim sheet, web-like sheet and ligaments sheet are observed with the increase of jet velocity. A series of images show that the wave length on the surface of sheets tends to decline as the jet velocity increases. At a low We number, the breakup length increases with an increasing We number. However, it first increases and then decreases when the liquid sheet breaks up at a high We number. The liquid jets with larger diameter collide to each other and lead to a liquid sheet with a smaller breakup length.
Crashworthiness Analysis and Optimization of Thin-Walled Square Tube with Pyramidal Ripples Based on Mechanics Properties
Authors: Hu Xiao Guang , Yang Jing Bo
Published: December 2012

Thin-walled structure absorbs most impact kinetic energy during collision accident,and they are widely used as energy-absorbing element. In order to improve crashworthiness of them, regular pyramidal ripple is added on the thin-walled square tube’s surface. Explicit finite element technology is applied to simulate the behavior of the tube under axial impact load. Simulation data was delt with by Response Surface Method to form a function of variables and response,and the new structure was optimized. Research results show that, the thin-walled square tube with pyramidal ripples can improve controllable of structure deformation obviously and Optimized structure can absorb and dissipate much more impact kinetic energy.
Study on Building Seismic Design Based on Mechanics Properties with Economical Assessment
Authors: Zhong Min , Ji Wei
Published: December 2012

A simple type of structure with two different fortification intensities was chosen to calculate, and the costs between the low intensity structure after reinforcement and the high intensity structure were compared. The possible economic losses of structures in different seismic fortification intensity was also compared in order to analysis the affect of intensity on the building economic effect. The result showed that the economic benefit of high intensity structure was 1.07, and the reinforced low intensity structure was 0.58. So the economic benefit of structure with reasonable seismic input was evident.
Graphic Method for Design of Eccentric Slider-Crank Mechanism and Analyzing of Feasible Region
Authors: Hao Cai Zhe , Ma Shi Hui , Cai Guang Xin , Yu Jian Guo , Jia Zhi Ning
Published: December 2012

Based on the analysis to the geometric relations of eccentric slider-crank mechanism (ESCM) at two limiting positions, a new and simple graphic method for design of ESCM was proposed in the paper. The method has the characteristics of legible concept, concise operation and good practicality. Utilizing the new method, the ESCM could be designed quickly under given conditions (slider stroke H, coefficient of travel speed variation K, the auxiliary conditions such as the length of crank a, length of connecting rod b and deflection distance e) without any calculation. Meanwhile, under given conditions (H, K) the alternative region of crank fixed center A, the possible feasible regions of crank length a and deflection distance e were discussed.
Analysis and Optimization of Level-I Vibration Absorption of Single Drum Vibratory Roller
Authors: Zhang Xiao Bo , Zhang Da Wei , Feng Zhong Xu
Published: December 2012

The vibration absorption is the principle factor which influences the working reliability, operating comfort, noise and parts service life of vibratory roller. This paper made a test on the performance of a new type of single drum vibratory roller with a national brand and found the problem of polarization and shimmy; set up a physical model of the roller for simulation analysis, seeking the reasons of polarization and shimmy, as well as proposing the improvement program so that the performance of Level-I vibration absorption of the sample was improved while each indicator of vibration severity can be above the permissible level.
Potential Application of Palm Ash as a Raw Materials in Production of Green Glass
Authors: Noorina Hidayu Jamil , Al Bakri Abdullah Mohd Mustafa , Faizul Che Pa , Ruhiyuddin Mohd Zaki , Murizam Darus , Ruzaidi Ghazali Che Mohd , Mohamed Faisol Mohamed Nor
Published: December 2012

Oil Palm Ash is one of the abundance agricultural wastes found in Malaysia. This wastes need to be disposed properly. Oil palm ash contains compounds needed to produce glass. Most of raw materials (especially silica) used to produce existing commercial glass are imported; therefore it is the best time to highlight the potential of local natural waste as the raw material in glass production. In this study, raw material characterization, glass production and glass product evaluation has been done. A few parameters have been recognized to have effect on green glass production such as mixing compositions and firing temperature. Oil palm ash has been washed and dried then sieved to get uniformity of particle size. Then, oil palm ash is mixed with other glass materials such as alumina and flux and undergone melting process at 1400°C. Through the experiments, the best glass compositions are as follows: 80% palm ash, 10% kaolin and 10% feldspar or 10% dolomite while the suitable temperature being used for sintering process to produced end product is range between 1150°C to 1200°.
Nano-Optical Fiber Evanescent Field Sensors
Authors: Chyad Radhi M. , Mat Jafri Mohd Zubir , Ibrahim Kamarulazizi
Published: December 2012

The nanofiber optic evanescent field sensor based on a changed cladding part as a sensor presented numerically. The influences of numerical opening, core radius of the fiber, the wavelength is effected on the light source and the submicron fiber on the sensors are promise to studied in this work. The results pointed out the sensitivity of the sensor increases when the numerical opening of the fiber is increases and the core radius is decreases. The NA of the fiber affects the sensitivity of the sensor. In the uniform core fiber, the increase in the NA increases the sensitivity of the sensor. Therefore, one should choose a fiber with high NA for the design of an evanescent-wave-absorption sensor if the core of the sensing segment uniform in diameter, so that the increase in the penetration depth or number of ray reflections or both, increases the evanescent absorption field and hence the sensitivity of the sensors. Keywords:fiber optic sensor, chemical sensors, biosensors, nanofiber optic.