bluuebunny/crossref_metadata_2025 huggingface dataset:
A Method about the Worn Materials Applied to the Marine Mechanical and Electronic Equipments in Condition Monitoring
Authors: Liu Yu , Wang Zhen Tao , Tan Zhen Dong , Tian Hong Xiang
Published: May 2011

The faults of the machines appeared suddenly usually cause to huge losing. So it’s important to monitor and analyze the condition of the machines. Now, more and more methods have been applied to condition monitoring and fault diagnoses. The spectral analysis technique has been widely used to detect the contents of abrasive metal in the lubricating oil. To mine the spectral data better, a method was put forward, which can be used to build the healthy record and reveal the important information about the operated conditions of the equipment. In the method, the similar information of the principal component in oil was obtained in the stable abrasion of the different friction pairs of equipment. The composition of mechanical and electrical equipment was also gained. The healthy record was created preliminarily according to all the information. In the malfunction detection of the equipment, cooperated with the data of the threshold of oil, the analysis results of spectra can be compared with the healthy record. So, the abnormal abrasion can be judged accurately.
A Method of Improving Limiting Drawing Ratio：Differential Temperature Deep Drawing Based on Superplasticity
Authors: Xu Xue Feng , Li Ning , Wang Gao Chao , Dong Hong Bo
Published: May 2011

A thermal-mechanical coupled analysis of superplastic differential temperature deep drawing (SDTDD) with the MARC finite element code is performed in this paper. Initial drawing blank of an AA5083 bracket was calculated and adjusted according to the simulation result. During the SDTDD simulation, the power-law constitutive model of AA5083 was established as function of temperature and implanted in software MARC through new complied subroutine. Under the guide of the numerical simulation, the die was fabricated and the AA5083 bracket was successfully manufactured via superplastic differential temperature deep drawing. In forming practice, the temperature of female die was kept at 525°C, i.e. the optimal superplastic temperature of AA5083, and the punch was cooled by the flowing water throughout the forming process. The drawing velocity of punch was 0.1mm/s. Results revealed that the formed bracket had a sound uniform thickness distribution. Good agreement was obtained between the formed thickness profiles and the predicted ones.
Method Study of Improving Surface Corrosion Resistance of 6063 Aluminum Alloy
Authors: Zhang Jian Xin , Gao Ai Hua
Published: May 2011

The method to improving surface corrosion resistance of 6063 aluminum alloy was studied, and the mechanism of surface corrosion resistanc was discussed in theory. The results indicate that the adjustment of chemical composition is of advantage to corrosion resistance of the alloy, its property is better as Mg, Si mass ratio at about 1.55. The necessary homogenizing treatment of cast ingot subserves corrosion resistanc of aluminum extrusion, and the cast ingot should be cooled quickly after heat treatment. Significant effect of extrusion technology on erosive property is observed from aluminum alloy, aluminum extrusion has good corrosion resistance when outlet temperature is at about 510 degree centigrade.
Buckling Behavior of FGM Elastic Arches Subjected to Uniformly Distributed Radial Follow Load
Authors: Song Xi , Li Shi Rong , Zhao Yong Gang
Published: May 2011

It is assumed that the material properties of arches vary with the thickness direction as a power function. Based on Kirchhoff’s assumption of straight normal line and the theory of axial extension and geometric nonlinearity, the in-plane buckling behavior of FGM elastic arches subjected to uniformly distributed radial follow loads is studied. In this paper, the governing equations for the nonlinear stability of FGM elastic arches are derived, the effect of composition parameters of FGMs, geometric parameters of arches and ends restraints on critical loads and balance configurations is investigated, and corresponding graphs are plotted.
Influence of Gadolinium Addition on Electrochemical Properties of Magnesium Sacrificial Anode
Authors: Yan Ai Jun , Feng La Jun , Shen Wen Ning , Wang Zi Peng
Published: May 2011

According to the low current efficiency of magnesium sacrificial anode, magnesium sacrificial anode material with gadolinium addition was investigated. The electrochemical properties of the material were measured by constant current method. The microstructure and composition of the anode material were characterized by metallurgical microscope and energy spectrum analysis. The results show that addition of gadolinium in magnesium sacrificial anode can refine grain size, change second-phase distribution, maximize current efficiency, and minimize potential of magnesium sacrificial anode. When the addition of gadolinium reaches 0.1%, the highest current efficiency is reached as much as 65.32%, which increases by 10%, compared with magnesium anode without gadolinium addition.
Structure Evolution of the Atomized Powders of Fe-25Cr-3.9C Alloy with Addition of Ni and B Elements
Authors: Song Chang Jiang , Guo Yuan Yi , Zhu Liang , Li Ke Feng , Yang Min , Zhai Qi Jie
Published: May 2011

High chromium cast iron alloys are widely used to produce wear resistant components. However, formation of the large carbides restricts their applied range for the components by traditional solidification techniques. The gas atomization is an effective approach to refine their structures, improve their properties and extend their application field. Based on the study of structure evolution of atomized powders of Fe-25Cr-3.9C alloy, this paper investigated the structure evolution of the atomized powders of Fe-25Cr-3.9C alloy with addition of Ni and B elements. It is found that addition of Ni and B elements make more primary lath-shaped phase be formed. As particle size decrease, width of the primary lath-shaped phase gradually decreases, and the structures are all composed of lath-shaped phase in the small powders with diameter less than 38mm. At last, a relative study between two alloys was made, and the structure formation of atomized powders was discussed.
Effect of the Content of Paraffin Microcapsule on the Thermal Performance of Infrared Camouflage Coatings
Authors: Yu Rong Sheng , Yan Hua , Xu Zhong Cheng , Liu Zhao Hui , Gu Zi Di
Published: May 2011

As the phase change material, paraffin microcapsule thermal performance of infrared camouflage coatings were studied, With blank contrastive experiments and changing the content of paraffin microcapsule, it is studied the thermal performance of infrared camouflage coatings. This study has shown that there has a high performance of storing and retaining the caloric of the infrared camouflage coatings, with the temperature 7°C. The content of paraffin microcapsule has a great effect on the infrared thermal performance in coating, the higher content of paraffin microcapsule, the better thermal performance of storing and retaining the caloric. The difference of the temperature can reach the highest value at 7°C between 35% or 40% and 25% paraffin microcapsule in the coatings.
Hydrogen Bonded Side Chain Liquid Crystallines Based on Poly(4-Vinylpridine)
Authors: Han Xian Gen , Chen Xu Zhong , Qian Lu Lu , We Xian Yong
Published: May 2011

A series of novel liquid crystal were synthesized with alkyloxyben- zimidoylbenzoic acid (CnABOH) and poly(4-binylpridind) (PVP) through hydrogen bond self-assemble between carboxyl groups of alkyloxybenzimidoylbenzoic and nitrogen of PVP. PVP was used as a hydrogen bond acceptor polymer. The CnABOH (n is the number of carbon atom) had been used as H-bond donor. The existence of H-bond was confirmed used FTIR spectroscopy. Optical microscopy was used to investigate liquid crystalline behaviors. The mesophases of the complexes (PVP-CnABOH) were obviously different from LC behaviors of the CnABOH. With increasing length of terminal group, the melting temperature reduced and the temperature range of the LC mesophase increased. For instance, while the number of carbon atom increased from 3 to 8, the melting temperature reduced from 180°C to 156°C and the range of LC mesophase increased from 36°C to 84°C.
Luminescence of Ce 3+ or Tb 3+ in Lithium-Barium-Gadolinium-Aluminosilicate Oxyfluoride Glasses
Authors: Zuo Cheng Gang , Lu An Xian , Zhu Li Gang , Long Wo Yun
Published: May 2011

Ce3+ or Tb3+ ions activated lithium-barium-gadolinium-aluminosilicate oxyfluoride glasses have been prepared. The transmission, emission and excitation spectra were measured. It has been found that those Ce3+ or Tb3+-doped lithium-barium-gadolinium-aluminosilicate oxyfluoride glasses exhibit good UV-excited luminescence. Energy transfer process from Gd3+ ion to Ce3+ or Tb3+ ion is indicated.
Annealing Treatment for Superplastic Forming of Twin Roll Casted AZ31 Magnesium Sheet
Authors: Shi Guo Dong , Qiao Jun
Published: May 2011

Annealing treatments at 200°C, 250 °C, 300°C, and 350°C were conducted on a twin-roll casted AZ31 sheet with an initial average grain size of 10.11 mm. Microstructure and mechanical behaviors were studied by optical microscope observation and tensile mechanical test. Expermeintal results show that grain size experienced three stage evolution during 180 min annealing at each temperature: recrystallization refinement, stabilization under dynamic balance of recrystallization and grain growth, and grain growth. The minimum average grain size of 5.96 μm was achieved after 120 min annealing at 200°C. The refined grain structure causes a decrease of ultimate tensile strength and an increase of elongation, and facilitates superplastic deformation of the material.
Preparation of Porous Carbon Film and its Application in Li-Ion Battery
Authors: Chen Qing Yun , Jiang Xiao Wen
Published: May 2011

Porous carbon film was prepared from polyimide (PI) containing nickel particles by heat-treatment at different temperature. The prepared samples were investigated by multipoint brunauer-Emmett-Teller surface area (BET), scanning electron microscopy (SEM) and X-ray diffraction. The mesopore structure was obtained by heat-treating at 1000°C and the macropore and layered-graphite structure was achieved by heat-treating at 1600°C. The electrochemical properties of the carbon films were studied by galvanostatic cycling. The results showed that the reversible capacity of the carbon film treated at 1600°C is a promising material to be used in the lithium battery.
Electrical and Physical Properties of Sodium Potassium Niobates Thin Films Prepared by rf Magnetron Sputtering Technology
Authors: Cheng Chien Min , Chen Shih Fang , Tsai Jen Hwan , Chen Kai Huang , Su Hsiu Hsien
Published: May 2011

Lead-free potassium sodium niobate ceramic thin films were synthesized using rf magnetron sputtering technology for MFIS structures. The optimal sputtering parameters of the as-deposited KNN thin films for depositing times of 1h were obtained. Regarding the measured physical properties, the micro-structure and thickness of as-deposited KNN thin films for different oxygen concentration were obtained and compared by XRD patterns and SEM images. The surface roughness of KNN thin film was also observed by AFM morphology. The average grain size and root mean square roughness were 250 and 7.04 nm, respectively. For KNN thin films in the MFIS structure, the capacitance and leakage current density were 280 pF and 10-8A/cm2, respectively. We investigated that the leakage current density and the memory window increased, the capacitance critically increased as the oxygen concentration increased from 0 to 40%. However, the excess oxygen concentration process was decreased the electrical and physical of as-deposited KNN thin film. The effect of oxygen concentration on the physical and electrical characteristics of KNN thin films was investigated and determined.
The Preliminary Research on the Coating of FBG Embedded in Composites used in Large Aircraft
Authors: Yin Yan Zi , Wang Ji Hui , Li Han , Sun Jiu Xiao , Tian Heng , Ji Yun Dong
Published: May 2011

The optical fibers with epoxy acrylates and urethane acrylates UV-curable coatings were embedded in composites. It’s found that after high-temperature heated, when the coating’s glass transition temperature was higher than the heating temperature, the microstructure of the coating would not change, but when the coating’s glass transition temperature was lower than the heating temperature, the coating would detached from optical fiber. FBG (fiber Bragg grating) sensors with coating and naked FBG (without coating) sensors were embedded in composite materials to monitor impacting damage. It was found that when the coating broke away from the optical fiber which was embedded in the composites, the sensitivity of the FBG sensors would reduce.
Synthesis of Papercut-Like Carbon Sheets by a Simple Pyrolysis Method
Authors: Zhu Ling Ling , Xiao Pei Pei , Qian Yi Tai
Published: May 2011

In this study, papercut-like carbon sheets with an average size of about 20 nm in thickness have been successfully synthesized by the pyrolysis of tetrachloromethane and calcium carbide in an autoclave in 600 °C in the existence of alloy (Fe-Co-Ni). The X-ray powder diffraction (XRD) reveals amorphous carbon nature of the as-prepared sample. The thermal stability of the as-prepared sample was also studied.
Photocatalytic Activity of SiO2/TiO2 Supported on Glass Fiber under Vsible Light Irradiation
Authors: Zhang Xiang Chao , Li Yun Long , Lin Zhong Xin , Zhang Shi Ying
Published: May 2011

A SiO2/TiO2 supported on glass fibers photocatalyst with visible light activity were synthesized by sol-gel technology, butyl titanate as a Ti source, and tetraethylorthosilicate (TEOS) as a Si source. The photocatalytic activitie under visible light of SiO2/TiO2 supported on glass fibers were evaluated by the photocatalytic decomposition of methylene blue. The samples were characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS). The results show that the optical absorption edges of the SiO2/TiO2 showed red shift with increasing the dopant of SiO2. The sample of SiO2/TiO2 supported on glass fiber (atomic ratio of Si/Ti=0.05) has the highest catalytic efficiency under visible light irradiation.
Synthesis and Electrical Properties of End-Functionalized Poly(N-Isopropylacrylamide) with β-Cyclodextrin and its Ferrocene Inclusion Complex
Authors: Gao Zheng Guo , Duan Qian
Published: May 2011

The ATRP of N-isopropylacrylamide (NIPAM) was carried out in DMF/water at 60 °C to afford a novel linear end-functionalized poly(N-isopropylacrylamide) with acetylated β-CD (AcCD-PNIPAM) and the structures of the products were characterized. The number-average molecular weight (Mn) and the polydispersity index (PDI) of the polymer were obtained from gel permeation chromatography (GPC) analysis. The end-functionalized PNIPAM with β-CD (CD-PNIPAM) was obtained by deacetylation from AcCD-PNIPAM. The lower critical solution temperature (LCST) for the aqueous solutions of CD-PNIPAM, measured by means of ultraviolet-visible spectroscopy (UV-vis), was 4~5 °C higher than that of AcCD-PNIPAM. Ferrocene was included into CD-PNIPAM with mole ratio of 1:1 and the inclusion complex was characterized by cyclic voltammetry (CV) technology.
Preparation of Cu2ZnSnS4 Treated with Post-Sulfurization in a Sulfur Vapor Atmosphere
Authors: Yeh Min Yen , Wuu Dong Sing
Published: May 2011

Cu2ZnSnS4 (CZTS) prepared by sol-gel spin-coating deposition was treated with post-sulfurization in a sulfur vapor atmosphere. The crystallinity degree of the CZTS could be significantly improved through post-sulfurization treatment. Granular structures of the CZTS as synthesized at a temperature of over 240 °C and treated with post sulfurization were obtained. The composition ratios of the as-sulfurized CZTS were close to the composition stoichiometry of CZTS with an electrical resistance of ~ 1.7 Ω cm. An as-prepared CZTS based solar cell shows an open-circuit voltage of 300 mV, and a short-circuit current of 2.48 mA cm-2.
Study on Preparation and Properties of β-NiOOH
Authors: Gu Hui Min , Wang Wei , Zhai Yu Chun
Published: May 2011

Taking β-Ni(OH)2 powder as raw material and K2S2O8 as oxidant, β-NiOOH was prepared through chemical oxidation process, then which was used as cathode material to assemble nickel-zinc cell. Effects of reaction time, reaction temperature, NaOH concentration, Ni(OH)2 concentration and mass ratio of K2S2O8 and Ni(OH) 2 on 1st discharge specific capacity of cells were studied. XRD result indicates that the crystal structure of β-NiOOH is disordered in a way. TG-DTA analysis indicates that the decomposition reaction of β-NiOOH occurs at temperature of 156-280 °C, the end product is NiO.
Study of Brazeability of SiCP/A356 Composites and Aluminum Alloy Using Semisolid Metal with High Solid Fraction by Stirring
Authors: Xu Hui Bin , Luo Quan Xiang , He Jin Ying , Zhou Bo Fang , Zeng You Liang , Du Chang Hua
Published: May 2011

The semi-solid brazing process of SiCp/A356 composites and 2024 aluminum alloy using Zn-Al eutectic filler metal at 450 °C has been investigated. The two substrates and Zn-Al filler metal were heated up to the semisolid temperature range of Zn-Al filler metal by a resistance heating plate. In order to mix the filler metal with the base metal of both sides to be a single uniform joint, a stirrer was introduced into the weld seam. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be joining by semisolid metal. It can be found that almost half of the oxide film on the surface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds formed between the filler metal and the base materials on the interface of oxide had been disrupted. Moreover, the oxide film of surface of aluminum alloy was more thoroughly disrupted and removed than that of surface of composites with existing of SiC particle.
Processing Technique and Property Evaluation of Stab-Resistant Composite Fabrics
Authors: Lou Ching Wen , Lin Chia Chang , Hsing Wen Hao , Huang Chao Chiung , Chien Yen Min , Lin Jia Horng
Published: May 2011

In this research, the nonwoven fabrics were made of 50 % high-tenacity polyester fiber and 50 % low melting polyester fiber, after which the nonwoven fabrics were thermal-treated at 110 °C, 120 °C, 130 °C, 140 °C and 150 °C for 1 min, 2 min, 3 min, 4 min and 5 min. Next, two layers of nonwoven fabrics were laminated with a layer glass (GF) fiber plain fabric or a layer of Nylon 66 grid, forming the sandwich structure. The nonwoven/ GF composite fabrics and the nonwoven/ Nylon 66 grid composite fabrics were also reinforced by needle-punching and thermal treatment, after which the two composite fabrics were measured with tensile strength and stab-resistant strength. Meanwhile, two layers of nonwoven fabrics needle-punched served as the control group. According to the results, Nylon 66 grid and glass fibers plain fabrics were both good at strengthening, the former reinforced the tensile strength of the composite fabrics and the later heightened the stab-resistant strength of the composite fabrics.
The Electrical Conductivity and Infrared Properties of Ba-Doped SmCoO3-δ Composite Oxides
Authors: Chen Le , Lu Chun Hua , Zhao Yuan Zheng , Zhang Wen Yan , Ni Ya Ru , Xu Zhong Zi
Published: May 2011

Layered SmBaCo2O5+δ with the cation-ordered double perovskite structure were synthesized by the solid-state reaction route and characterized by thermal analysis, X-ray diffraction, infrared spectrum, electrical conductivity and infrared emissivity. The Sm1-xBaxCoO3(SBCO) system shows the different crystal structures with the variation of barium content, which results in the different electrical behavior. The electrical conductivity reaches maximum when x is 0.5 with SmBaCo2O5.54 phase. The infrared absorption occurs at about 600 cm-1 for all the samples which were attributed to Co-O stretching modes. The peak shifted to a lower frequency with the increase of doping level. In addition, the comparison of electrical and emissivity measurements suggested that variation of infrared emissivity is in agreement with the electrical properties.
Microstructure Study of Undercooled Hypereutectic Cu95Cr5 Alloys
Authors: Zhou Zhi Ming , Tang Li Wen , Huang Wei Jiu , Hu Jian Jun , Zhou Tao , Chen Kang , Peng Cheng Yun , Xia Hua
Published: May 2011

Microstructure of Cr-rich phase in undercooled hypereutectic Cu95Cr5 alloys was studied by using arc melting, electromagntic levitation melting and splat quenching. The results showed that the alloys generally have a microstructure consisting of a fine Cr-rich dendrites in a Cu-rich matrix. Even there existed strong electromagnetic stirring during solidification process, the nonhomogeneous Cr-rich dendrites were observed in electromagnetic levitation melted alloys. However, fine homogenous primary Cr-rich particles or equiaxed Cr-rich grains distributed in the Cu-rich matrix in splat quenched alloys.
Study on Synergistic Scale Inhibition Performance of the Rare-Earth Permanent Magnetic Material and Polyaspartic Acid
Authors: Liu Zhen Fa , Liu Han Shuo , Zhang Li Hui , Yan Mei Fang
Published: May 2011

The synergistic scale inhibition effect of rare-earth permanent magnetic material and polyaspartic acid is studied. The performance of synergistic scale inhibition is studied in different magnetic field intensity, water hardness and rate of concentration. Static and dynamic scale inhibition tests show that the two water treatment ways have good synergistic scale inhibition effect. The scale inhibition performance of polyaspartic acid can be increased greatly by the magnetization of water.
Inhibition of [NH2Et2][(4-MeC6H4O)2PS2] for Carbon Steel in Hydrochloric Acid Solution
Authors: Xiang Zhen , Yang Xue , Xie Bin , Zou Li Ke , Xiang Yang Guang , Lai Chuan
Published: May 2011

The inhibition effect of N,N-diethylammonium O,O'-di(4-Methylpheny)dithiophosphate (NOPP, [NH2Et2][(4-MeC6H4O)2PS2])against the corrosion of carbon steel in HCl solution was studied by weight loss measurements, electrochemical measurements, AFM and SEM techniques. The studies of weight loss measurements indicate that the NOPP acts as a good inhibitor for the corrosion of carbon steel in HCl solution. Polarization curves indicate NOPP is a mixed-type inhibitor. The adsorption of NOPP on carbon steel surface obeys the Langmuir isotherm, and the obtained standard free energy of adsorption suggests that the chemisorption takes place spontaneously.
Microwave Synthesis and Application of Cationic Bagasse Hemicelluloses
Authors: Zhu Hong Xiang , He Yu Cai , Jing Xiao Bi , Lee Hak Lae , Li Li Zi
Published: May 2011

Novel microwave synthesis cationic hemicelluloses from sugarcane bagasse were obtained by quaternization with CHMAC using sodium hydroxide as a catalyst in microwave synthesis condition. The parameters including the dosage of hemicellulose/CHMAC, the microwave time and the microwave power were optimized and the extent of quaternization was measured by zeta potential. As paper additive, the effect of cationic hemicellulose on bleached bagasse was researched. Then pulp handsheet properties were studied. The results indicated that adding the cationic hemicellulose could increase paper mechanical strengths, and its effect was better than original bleached bagasse pulp. At the dosage of 0.8% on oven dried pulp, paper tensile index, tensile strength, breaking length, burst index and folding endurance can be increased by 43.79%, 36.95%, 33.11%, 17.35%, 33.33% respectively, much better than the paper without the cationic hemicellulose.
Research on Flame Retardance and Application of Magnesium Hydroxide Sulfate Whiskers to HDPE
Authors: Xue Jian Rong , Zhong Hong , Fu Jian Gang
Published: May 2011

The flame retardant mechanism of magnesium hydroxide sulfate whiskers(MHSH) is analysed and MHSH and magnesium hydroxide are used to fill high-density polyethylene(HDPE) respectively. The mechanical and flame resistance properties of composite material (HDPE) were also studied in this paper contrastively. The tensile strength and elongation of the compound are increased 2.5% and 36% severally, while MHSH content in weight reaches 20%;at the same time, the oxygen index (OI) of composite materials varies from 17 to 24.2. In contrast, the tensile strength and elongation of the HDPE/ Mg(OH)2 compound are decreased 6.4% and 48% respectively, OI being 19.6. To sum up, the results of tensile and flame tests of compound material showed the HDPE containing as-prepared whiskers had better overall properties，exceeding that of Mg(OH)2.
Synthesis and Magnetic Properties of Fe–Ni Alloy Nanoparticles Obtained by Hydrothermal Reaction
Authors: Yuan Ming Liang , Tao Jia Hua , Yu Liang , Song Cong , Qiu Guan Zhou , Li Yong , Xu Zheng He
Published: May 2011

The magnetic properties of Fe-Ni alloy nanoparticles with particle size in the range 35-45 nm were prepared by almost simultaneously reducing Fe(II) and Ni(II) solution using hydrazine hydrate as a reducing agent in strong alkaline media for two hours at 80 °C. Chemical composition, crystal structure, morphology, thermal stability and magnetic properties of as synthesized Fe-Ni alloy nanoparticles were systematically characterized by means of XRD, TEM, TG-DSC and VSM. These results indicate that there is a vitally important relationship among particle size, particle morphology, and different mol ratio of FeSO4 to NiSO4. The saturation magnetization (Ms). and coercivity (Hc) strongly affected by the composition of Fe-Ni alloy nanoparticles. The hydrothermal reaction is a simple, effective, and low-cost synthetic method to prepare FeNi3 alloy nanoparticles.
Preparation and Chelating Properties of Polystyrene Modified Ethoxycarbonyl Thiourea Resin
Authors: Wang Shuai , Zhong Hong , Xia Liu Yin , Wang Zhong Nan , Zhang Qian
Published: May 2011

A novel polystyrene modified ethoxycarbonyl thiourea resin(PSETU) was synthesized by polymer grafting of aminated polystyrene and ethoxycarbonyl isothiocyanate. The adsorption capacities of PSETU follow the order: Au(III) > Cu(II) > Zn(II) > Ni(II) > Fe(III) > Ca(II) ≈ Mg(II). The adsorption capacity for Au(III) increases with the increase of contact time, temperature and initial concentration of Au(III). The adsorption data fit Boyd’s diffusion equation of liquid film, Langmuir adsorption isotherm and Freundlich adsorption isotherm. The maximum adsorption capacity of PSETU calculated by Langmuir isotherm equation is 3.485 mmol/g, and the separation factors of PSETU for Au(III)-base metal ions are above 380. According to XPS results, the functional atoms of PSETU coordinate with Au(III) during the adsorption process.
Numerical Simulation Study of High-Speed Milling Thin-Wall Part
Authors: Tang De Wen , Peng Ru Shu , Zhao Rui Lan
Published: May 2011

According to the weak rigidity characteristics of thin-walled parts, the material parameters and deformation tools are taken into account. In this paper, the finite element model of high-speed milling process is systematically studied by a large-scale finite element analysis (FEA) software DEFORM-3D with the modified Johnson-Cook model. The simulated results of cutting force, chip morphology, effective stress, effective strain and cutting temperature in deformation zones of thin-wall part are analyzed. On the basis of simulation results, cutting force of high speed milling on thin-wall part is verified. Comparing to the experimental results, the simulated results of cutting force, chip morphology, effective stress and cutting temperature in deformation zones of high speed peripheral milling indicate good consistence and the models established can be used to accurately predict the thin wall deformation. Therefore, numerical simulation method for the thin wall milling deformation control and provide a new way of compensation.
Synthesis and Characterization of a Kind of Superparamagnetic Material
Authors: Li Dan Dan , Li Xiao Yan , Huang Xing , Wang Yu Xiang , Zhao Ya Juan
Published: May 2011

A new superparamagnetic material was synthesized by a method involving the use of dimethylolpropionic acid (DMPA) and ferrous powder in N,N-dimethylformamide (DMF) as a solvent in this work. Through the magnetic balance measurements, fourier transform infrared spectrophotometry (FTIR) and so on, it was found that the synthesized material emerged superparamagnetism at room temperature. Additionally, there was a regular change for the magnetic response behavior with different temperature and time in some way.
Preparation and Characterization of Yttrium Oxide Coatings by Plasma Spraying
Authors: Luo Xiao Chen , Wang Wen Dong , Liu Bang Wu , Li Chao Bo , Xia Yang
Published: May 2011

Y2O3 coatings were prepared on aluminum substrates using plasma spraying with argon as primary gas. Structure and morphology were characterized by using X-ray diffraction, scanning electron microscopy and metallographic analysis. Results show that Y2O3 coating’s porosity is 5.6%. Coatings prepared with helium as secondary gas are purely white. However, there are black spots when hydrogen is used as secondary gas. A phase transformation from cubic to monoclinic tends to take place during the spraying operation under argon and hydrogen atmosphere. However this prejudicial transformation can be suppressed by using helium instead of hydrogen.
Numerical Studies of Flow-Induced Defects in Aluminum Ingot Die Casting Process
Authors: Han Xian Hong , Hora Pavel , Kong Xiao
Published: May 2011

A numerical modeling of aluminum die casting is discussed in this paper. Emphasis is laid on the flow-induced defects including air entrainment and oxide tracking. An ingot die casting process is designed by considering both laminar zone and turbulence zone. Pure aluminum is used as the casting material. In addition, different process parameters and different shapes of sprue are presented to check their influence to the flow status and flow-induced defects.
Synthesis, Optoelectronic Properties of a Novel Photochromic Diarylethene Bearing Phenyl and Thienyl Group
Authors: Jiang Duo Hua , Wang Wei Ping , Pu Shou Zhi , Liu Wei Jun
Published: May 2011

An unsymmetrical diarylethene derivative bearing both phenyl and thiophene moieties, in which a methoxyl group was substituted at the para-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 497 nm in hexane and at 510 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 408 nm when excited at 361 nm.
Improved Photocatalytic Activity of La3+-Doped Bi2O3
Authors: Zeng Jun , Zhong Jun Bo , Li Jian Zhang , Wang Shao Hua , Hu Wei
Published: May 2011

In this paper, Bi2O3 doped with different amount of La3+ was prepared. The prepared photocatalysts were characterized by BET, XRD, UV-VIS diffuse reflectance and XPS. The results show that 3%La3+-Bi2O3 prepared has the highest BET surface area, pore volume, the smallest pore size. 3%La3+-Bi2O3 exhibits the best photocatalytic activity. The results of further experiments show that the specific surface area, UV-Vis diffuse reflectance and the binding energy all play an important role in promotion of photocatalytic activity of Bi2O3 nanostructure.
Optimizing of Pretreatment Process of Electroless Ni-P Plating on Aluminum Substrate
Authors: Liu Guan Jun , Yu Zhou , Cao Jun
Published: May 2011

In order to improve and simplify the process of electroless Ni-P plating on aluminum substrate, a activated solution and process were optimized by orthogonal test, the plating morphology were analysed using Quanta 200 type scanning electron microscope. The bond between the plating and aluminum substrate were evaluated using method of water quenching and alternating bending test. The results show that good coating can be obtained on aluminum substrate under the normal condition of the acid electroless Ni-P plating solution with sulfuric acid of 120g/L and nitric acid of 10-15g/L as activated solution and activated time of 20 min. And the good bond between the plating and aluminum substrate was obtained.
Study on Microstructure and Formability of Laser Tailor-Welded Joints of Aluminum Alloy Thin Sheet
Authors: Li Yun Tao , Ye Juan , Wang Jin Kui , Song Ji Shun , Zhang Jian
Published: May 2011

As an advanced manufacturing technology, tailor welded blanks (TWB) not only meet different requirements of properties in different parts, but also can satisfy the requirements of weight reduction and energy conservation. 6061 aluminum alloy with the thickness of 1mm was jointed by laser beam welding technology and the microstructure of tailor-welded joints was analyzed compare to base metal. The forming and bulging property characteristics of TWB were evaluated through tensile and cupping tests. Experimental results indicated that: the weld joints contained fine equiaxed grains in the center of the weld and columnar grains and dendrites near the fusion boundary were observed to be oriented towards the center of the weld. The dendrites became smaller and thinner during the transition process from the weld fusion boundary to the center. The fracture path of the TWB tensile specimens occurred in the heat-affected zone (HAZ) with the tensile and yield strength increased while the strain hardening coefficient and elongation reduced compared to base metal. The erichsen index of TWB in the cupping test was lower than base material, which demonstrated that the bulging property of the TWB was worse than base metal.
Hydrothermal Synthesis and Charaction of α-Fe2O3 Mesocrystals and Nanorings
Authors: Deng Bin , Li Qiang Guo , Wang Cun Chang
Published: May 2011

α-Fe2O3 mesocrystals and nanorings have been prepared by hydrothermal method, using phosphate and sulfate ions as additives. Hydrothermal treated at 180 °C for 24 h in presence of C3H8NO6P and Na2SO4 leads to the formation of capsule-shaped α-Fe2O3 mesocrystals, when the reaction time prolonged to 96 h α-Fe2O3 nanorings formed. It can tune the size and morphology of the final products by varying the ratios of phosphate and sulfate ions to ferric ions. XRD, SEM, TEM, HRTEM, UV-Vis, FT-IR were used to characterize the products. A formation process involving the selective adsorption and the cooperative coordination effect have been deduced.
Microstructure of In Situ TiB Reinforced Titanium Matrix Composite Coatings by Laser Cladding with Different Pre-Placed Powder Thickness
Authors: Zhang You Feng , Li Jun
Published: May 2011

In situ reaction synthesized TiB reinforced titanium matrix composites were fabricated using rapid non-equilibrium synthesis techniques of laser cladding. Titanium matrix composite were laser cladding treated on Ti-6Al-4V using Ti and B powder mixture, and the designed weight fractions of B were 10 wt.% in the starting powder mixture. The composite coating mainly consists of α-Ti and TiB. The reinforcement TiB is dispersed homogeneously in the composite coating with pre-placed powder thickness of 0.5mm. The influence of pre-placed powder thickness on microstructure of laser cladding coatings was discussed.
Clamping Accuracy Detection and Display System of Integral Turbine-rotor in Molecular Pump
Authors: Zhao Yan , Yang Shi Yu , Liu Hao Ran , Liu Bin , Shao Jing
Published: May 2011

Molecular pump with magnetic suspension is an important vacuum extractor. The machining accuracy of turbine-rotor has crucial influence on the key parameters of molecular pump, such as pumping speed, compression ratio. A clamping accuracy detection and display system of semi-fished turbine-rotor was established. The maximum coaxiality error and its position could be detected, displayed and recorded easily. With a precision fine tuning device, coaxiality error could be reduced from 30µm to 10µm. This system effectively reduces the turbine-rotor’s centrifugal force, and increases the stability of molecular pump with magnetic suspension.
A Novel Elastomer Simulated Skin Applied in Measurement of Extravehicular Liquid Cooling Garment
Authors: Yang Kai , Jiao Ming Li
Published: May 2011

A novel thermoplastic elastomer was applied in the measurement of extravehicular liquid cooling garment and the satisfying result in improving the heat dissipating capacity of liquid cooling garment was achieved. Firstly, five kinds of elastomer were selected, which were ethylene-vinyl acetate copolymer (EVA), high temperature vulcanized silicone rubber (HTV), medical used silicon rubber (MSR), natural rubber latex (NRL) and thermoplastic SBS complex (TPR). To evaluate the synthetic performance of these materials, a series of experiments characterizing material’s mechanical and thermodynamic properties was performed, including tensile and compression test, heat property test and so on. Meanwhile, fuzzy mathematic method was employed to get parameters’ weight distribution, and then fuzzy decision-making method was adopted to perform synthetic evaluation, which showed that TPR had satisfying optimization performance and can be used as simulated skin in thermal manikin. Finally, to verify the function of TPR simulated skin, comparative experiments were performed in climate chamber when thermal manikin covered with TPR simulated skin and did not cover with TPR simulated skin. Results show that TPR simulated skin can effectively improve the heat dissipating capacity of liquid cooling garment.
Influence of the Second Phase Particle’s Size Distribution on Grain Growth Based on Computer Simulation
Authors: Ma Xiao Fei
Published: May 2011

Based on cellular automata, a model of simulating grain growth is established to study the effects of the second phase particle’s size distribution on grain growth. The simulation results show that the second phase particles in the matix pin the grain boundary and then inhibit the grain growth. Different size distributions of the second phase particles have different pinning effect on the grain boundary, and the relationship of average grain size for the material with the second phase particles is RLognormal＞RUniform＞RNormal. The correlative laws obtained from the simulation is in accordance with the theoretical models.
Preparation and Electrochemical Characteristics of Activated Carbon Micro-Spheres for Electric Double Layer Capacitor
Authors: Liu Bo , Deng Hui Ren , Ai Jiu Hong , Deng Jian Cheng
Published: May 2011

Carbon micro-spheres were obtained using β-cyclodextrin as the raw materials via hydrothermal synthesis and carbonization. The product had a perfect shape, smooth surface and narrow pore diameter distribution. The diameters were in the range of 400-700 nm. Then product was activated by ethanol and ammonium bicarbonate at low temperature in the closed system, respectively. The results showed that ammonium bicarbonate had better activation effect than ethanol. Moreover, specific surface area and pore volume of activated carbon micro-spheres reached to 1125 m2 g−1 and 0.485 mL g−1, respectively. As electrode materials of supercapacitors, the specific capacitance were improved from 154 F g−1 to 226 F g−1, increased by 46%.
The Research of Chemical Resistance for Air Curing FEVE Fluorocarbon Coatings
Authors: Li Li , Guo Xiao Cui , Zhou Yong Yan
Published: May 2011

This study aims at analyzing the chemical resistance of a wide range additives in air curing ﬂuorocarbon coatings. Scanning Electron Microscope (SEM) and Immersion tests are used to detect coatings performances. The results showed that the surface state of coating does not affect the chemical resistance. While fumed SiO2 content in the coating is lower than 5.2%, chemical resistance are enhanced as the increasing of fumed SiO2 content, then maintained stability as content is more than 5.2%. Chemical resistance is increased gradually while the rutile TiO2 content of coating is less than 3.1%, and essentially unchanged while greater than 3.1%. As wax powder content increases, chemical resistance of coating decreased. Coupling agent content increases, leading to enhanced chemical resistance of the coating when coupling agent content is less than 5.8% and maintained stable while greater than 5.8%. So fumed SiO2, rutile TiO2, and coupling agent would inhance chemical resistance for coating to a certain extent, and wax powder would weaken the chemical resistance.
Research on Core-Shell TiO2/Al2O3 by one-Step Hydrothermal
Authors: Liu Zhi Ping , Li Chang Ming , Yin Li Song
Published: May 2011

The core-shell structure’s synthesis process by one-step hydrothermal method has remarkable peculiarities, such as simple procedures and short production cycles. In order to get the precursor with the core-shell structure, it’s important to study the technological parameters. In this paper, the pH value, the concentration of AlCl3,the mass ratio of core and shell , the hydrothermal temperature and time were detailed discussed. In order to get well-coated core-shell material, the technological parameters were the pH value=8.5-9.8, the concentration of AlCl3 0.040－0.050g/ml, Al2O3：TiO2=10％－28.5％, the hydrothermal temperature 200°C and the hydrothermal time 3 hours.
Study on the Degradation in Vitro of Ciprofloxacin-Polyurethane Materials
Authors: Wen Zhi Guo , Li Chun Yan , Hu Cong Cong , Huang Jian Hua , Dong Sheng Xiong
Published: May 2011

Bacterial induced infection is a major complication associated with the use of medical implants. Degradable antibacterial ciprofloxacin-polyurethanes (CFPU) have been synthesized in attempts to address this problem. It is supposed that the material may be sensitively hydrolyzed by inflammatory enzyme, cholesterol esterase (CE), and the drug could be released according to the state of infection. The enzyme biodegradation experiments showed an extra release of ciprofloxacin when CFPU was incubated by enzyme solutions than by phosphate-buffer saline (PBS). Results showed that the drug release was enhanced as the concentration of the enzyme increased. The antimicrobial activities of degradation solutions were tested by broth dilution assay. The enzyme degradation solutions exhibited an ability to kill bacteria. The cell cytotoxicity assay indicated that the degradation products were hypotoxicity to human beings according to the cytotoxicity grade of United States Pharmacopoeia (USP).
The Thermal and Electrical Transport Properties of Carbon Micro-Coil
Authors: Wu Fa Yu , Wang Yi Yong , Zhang Jun Wei , Wang Zhi Ying , Zhou Yan Wen
Published: May 2011

The thermal and electrical transport properties of carbon micro-coils under the condition of common use were measured and discussed. The temperature-dependence, the load-bearing stability, the explicit and implicit values of those properties were brought forward to provide the references for their reliable industrial design and high efficient service.
The Effect of Load on Friction and Wear Behavior of NBR and FPM under Dry Sliding
Authors: Lv Xiao Ren , Sun Hao , Luo Xuan , Wang Shi Jie
Published: May 2011

The effect of load on the friction and wear behavior of NBR and FPM was investigated using a ring-on-block tester under dry sliding. The hardness and morphology of worn surface were measured using Shore Hardness and stereo microscope, respectively. The results showed that at the load of 50, 100 and 150N, the wear loss of NBR was lower than that of FPM and the frictional coefficient of NBR was the same as that of FPM. While at the load of 175, 200 and 225N, the wear loss and frictional coefficient of NBR were higher than that of FPM. The reason for the variation of friction and wear behavior of NBR and FPM under different load was discussed preliminarily.
Photocatalytic Activity of Bi2O3 Prepared by Different Precipitants
Authors: Zhong Jun Bo , Zeng Jun , Li Jian Zhang , Hu Wei
Published: May 2011

Paralled flaw precipitation method has been employed to synthesize nanostructured Bi2O3. It is found that the bandgap and photocatalytic performance of Bi2O3 has a strong dependence on the kind of precipitants. The prepared photocatalysts were characterized by BET, XRD, UV-Vis diffuse reflectance and SEM. The results show that Bi2O3 prepared by NH3·H2O has the highest BET surface area, pore volume, the smallest pore size and the particle average size. Bi2O3 prepared by NH3·H2O exhibits the best photocatalytic activity. The results of further experiments show that bandgap and the specific surface area all play an important role in promotion of photocatalytic activity of Bi2O3 prepared by NH3·H2O.
Analysis of Axial Load Transfer for Super-Long Single Pile in Layered Ground
Authors: Zhou Hua Cong , Yao Wen Juan , Zhang Ze Rong
Published: May 2011

Based on the bearing capacity behavior and load transfer mechanism of super-long pile in soft soil, the three-stage hyperbolic softening model is presented as the load transfer function of pile-side soil, and tri-linear model is introduced to simulate the characteristics of sediments in pile end. The differential equations are established by dealing with the states of static equilibrium, with considering the character of layered stratum and pile-soil interaction. The analytical solutions on different states are obtained by power series. Based on transfer matrix method, soil mechanics and elastic theory, a set of analytical equations and calculating method for the axial load-settlement curve of pile top in layered ground are established. Lastly, the calculating parameters are obtained by theoretically approaching to actually measure load-settlement curve in soft soil area. The calculating contrast to adjacent test pile is carried out by the method and the results are satisfactory.
Research on the Mechanical Behavior of High Strength Concrete
Authors: Luan Shu Guang , Zhang Rui Jin , Wang Hao
Published: May 2011

Bases on experimental investigations of HSC and NSC, HSC’s mechanical behavior, failure mechanism, fracture toughness, characteristic length and damage feature are discussed in the paper, and the formula for flexural strength and comparative toughness is given. The results show that the HSC has a good uniformity of structural entity and large cracking resistance. In addition, HSC is more brittle and more vulnerable to damage than NSC.
Chemical Effects of Environmental Factors on Asphalt Aging
Authors: Zhang Qian , Sun Hong Hong , Geng Jiu Guang
Published: May 2011

Asphalt aging occurs both in the construction period and in the service period of asphalt pavement. It is believed that aging could have a big influence on the rheological mechanical and adhesion characteristics of the asphalt. Asphalt aging is a process associated with a lot of factors as heat, rays, oxygen, and ozone. In the aging process, some chemical compositions of asphalt are subject to be activated by these factors and undergo some chemical changes. A theoretical analysis at a chemical reaction level to the asphalt aging mechanism is presented in this paper. Asphalt aging can be sorted as thermal oxidation aging, ray oxidation aging, and ozone oxidation aging. The thermal oxidation aging usually occurs in the components with chains and double bonds in their molecules. The ray oxidation aging can be found in components with one carbonyl or more carbonyls. Those components with a π key in their molecular structures are prone to the ozone oxidation aging.
Optimum Design of Unbonded Prestressed Tendons in Circular Pool Wall
Authors: Xie Lei , Zhao Ke Chao , Zha Zhi Xiang
Published: May 2011

Using the Equivalent Load Method of unbonded prestressed tendons reinforcement in cylindrical shell, and the concepts of influencing factors of pool wall boundary conditions for hydraulic or annular prestressed reinforcement, the way of unbounded prestressed tenons optimizing location is discussed. It is emphasized that the number of tenons in pool top wall is more than that of in pool bottom wall , and the optimum reinforcement ratio is only 1/3 ~ 1/4 of actual design reinforcement ratio.