bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Study on Tool Wear in Cutting Titanium Alloy Ti6Al4V
Authors: Yuan Yue Feng , Chen Wu Yi , Zhang Wen Ying
Published: May 2011

Tool wear experiments in turning titanium alloy Ti6Al4V in the solution-treated and aged condition were carried out; the influence rules of cutting parameters such as cutting speed, feed rate and cutting depth on the tool life were obtained. Experimental formula of tool wear was regressed based on multi-variable linear regression analysis, it could predict tool life under certain conditions.
Visible Light Photocatalytic Degradation PVC/B-F Co-Doped TiO2 Composite
Authors: Zhang Zhong Hou , Cao Guang Xiu , Li Ying Ying , Wei Xiao Yan
Published: May 2011

The B-F codoped nano-TiO2 powders were prepared by the sol-gel method. The surface of powders was modified by stearic acid. The visible light photodegradable PVC/B-F codoped nano-TiO2 composite films were prepared by tape casting processing. Solid-phase visible light photocatalytic degradation of the films were investigated with a 1000W xenon lamp and a ZJB 420 filter glass was used to cut off light of wavelength <420 nm. The weight-loss measurement, SEM, DSC of films were detected. Results showed that the weight loss of PVC/B-F codoped nano-TiO2 composite film (2%TiO2 w/w) is 16.9% after 120h UV irradiation, which is notably higher than that of both the pure PVC film and the PVC/nano-TiO2 composite film. Glass transition (Tg) is appeared for samples after 72h irradiation, and the Tg of PVC/B-F codoped nano-TiO2 composite film is the lowest of all samples. The surface of PVC/B-F codoped nano-TiO2 composite film was destroyed obviously by SEM photo.
Research on Microstructure Distribution of Aluminum Profiles with Different Wall Thickness Sections
Authors: Ma Jian Zhe , Liu Tie , Mao Da Heng , Li Ji Bin , Wang Hong Zhi
Published: May 2011

The mechanical properties of the extruded profiles depend on the final microstructure distribution in the extrusion process. To investigate the effect of the stain-rate and temperature on the microstructure distribution of the aluminum profiles, the aluminum profile with different wall thickness was studied by metallographic experiment and numerical simulation. The result showed that the distribution of fine equiaxed grain developed by the complete process of primary recrystallization and coarse grain developed by secondary recrystallization was consist with the distribution of temperature and strain-rate. The variation gradient of the strain-rate was the key factor which determines the distribution of microstructure in thick wall section. Compared with thick section, the higher strain-rate is the key factor that leads to secondary recrystallization, but lower temperature prevents complete process of recrystallization. in thin wall section.
Surface Morphologies of Sealed Film on Anodized Al Alloy
Authors: Zhou Qi , He Chun Lin , Cai Qing Kui , Zhao Ping
Published: May 2011

Surface morphologies of sealed films on anodized aluminum alloy extraordinarily affect on their corrosion resistance. Two-dimensional surface morphologies and three-dimensional surface morphologies of sol sealing, sodium dichromate sealing, boiling water sealing and unsealed films were obtained by OLS3100 laser scanning confocal microscope (LSCM). The three-dimensional surface morphologies show that the amounts of pores are greatly reduced when anodized aluminum 2024 are sealed by these methods. Surface roughness of sealed anodized aluminum 2024 films is increased comparing with the unsealed films, especially the boiling water sealing film. The results of two-dimensional surface morphologies show that unsealed films have plenty of spherical particles; there are raised blocks on sol film; there are much round or chrysalis cavities inside sodium dichromate sealing and boiling water sealing film. Especially there are the most and the deepest cavities with the largest diameter on the boiling water sealing film.
Electrochemical Determination of Nitrite Based on Gd Doped Nano Titanium Dioxide-Modified Gold Electrode
Authors: Zhang Man Le , He Jing Lin , Xu Chun Lan , Zhu Long Guan , Zheng Yun Fei , Zhou Yi , Zhang Ling , Luo Dong Mei , Cao Zhong
Published: May 2011

A simple and reliable method for electrochemical determination of nitrite based on Gd doped nano titanium dioxide (Gd-nano-TiO2) modified gold electrode was well developed in this paper. Using cyclic voltammetry, the modified electrode shows electrocatalytic activity for oxidation of nitrite in 0.10 mol×L-1 sulfuric acid solution (pH=0.70). The catalytic peak current was found to be linear with nitrite concentration in the range of 2.0´10-6 ~ 2.0´10-4 mol×L-1, with a detection limit of 1.1´10-6 mol×L-1 (S/N=3). Compared with spectrophotometry, the Gd-nano-TiO2 modified Au electrode could be used for the determination of nitrate in the ham sausage samples with a satisfactory recovery of 95.9 ~ 103.2%, showing its promising application in safety evaluation for food.
Calixarene Molecules Immobilized on Gold Substrates of QCM Sensors Based on Self-Assembled Monolayer Technology
Authors: Cao Yu , Cao Zhong , Xia Jiao Yun , Zeng Ju Lan , Sun Li Xian
Published: May 2011

Four calixarene supramolecular compounds, RCT, PCT, MRCT, and TBCA as active materials, were immobilized on gold substrates of quartz crystal microbalance (QCM) sensors by using L-cysteine self-assembled monolayer (SAM) as a linker. The RCT immobilized QCM sensor possessed the best response characteristics for methanol molecule when the assembling concentration of RCT reached 1.0 mg/mL. The frequency shift response value of the RCT immobilized QCM sensor was in direct proportion to the concentration of methanol vapor with a range of 0 ~ 6000 ppm. Comparing with a gas chromatography, the proposed QCM sensor could be well used for the determination of methanol vapor with a recovery rate of 98.01 ~ 103.9 %, and the two methods showed a well consistent examination result. Also, the sensor possessed good reproducibility and stability, showing that the RCT immobilized QCM sensor can be applied for the detection of the methanol vapor of atmospheric polutants in our living environment.
New Hypercrosslinked Polymer Adsorbents for Solid Phase Extraction of Polar Compounds
Authors: Zhou Qing , Zhang Man Cheng , Li Zhe Qin , Li Ai Min
Published: May 2011

Membrane emulsification-suspension polymerization method was introduced to prepare the monodisperse hypercrosslinked adsorbents ZQ-1 and ZQ-2 which can be used in solid phase extraction (SPE). Compared with the commercially available adsorbent LichrolutEN, ZQ-1 exhibits obvious superiority for five conventional polar analytes owing to its large specific surface area, hydrophilic groups and small particle size.
Nanoporous Carbon Derived from Rice Husk for Electrochemical Capacitor Application
Authors: Xing Wei , Li Xiao , Zhou Jin , Zhuo Shu Ping
Published: May 2011

Nanoporous carbons were prepared from rice husk (RH) according to a three-step procedure that includes pre-carbonization, silica removal and chemical activation. The surface area and pore structure of the nanoporous carbons are characterized intensively using N2 adsorption technique. The as-prepared carbons have specific surface area of up to 3283 m2/g, and total pore volume of up to 1.8 cm3/g. The effect of activating agent dosage on the pore structure of carbons was investigated and elucidated clearly. As evidenced by electrochemical measurements, the as-prepared carbons have good capacitive performances and their specific capacitances are much higher than ordered mesoporous carbon, thus highlighting the success of preparing high performance electrode material for EDLC from a biomass waste, rice husk.
Synthesis and Hydrogen Adsorption Properties of Templated Nanoporous Carbons
Authors: Xia Kai Sheng , Gao Qiu Ming
Published: May 2011

Four nanoporous carbons have been synthesized by using similar silica template method. The structural characterizations showed that the carbons retained ordered hexagonal or cubic pore structure expect for disordered CS41, which was prepared using MCM-41 as template. Nitrogen adsorptions at 77 K revealed that carbons with different pore size distribution, specific surface area and pore volume were obtained. The hydrogen adsorption capacity was measured by volumetric method, and the most promising candidate resulted to be microporous carbon CS41, which exhibited the highest H2 uptake of 1.17 wt % at 77 K and 1 bar. The capacities of hydrogen adsorbed in the nanoporous carbons were correlated with specific surface area and microporous volume. The result demonstrated that the H2 uptake in the carbons had essential relationship with volume of pores smaller than 1 nm.
Preparation and Formation Mechanism of Finely Dispersed Spherical ZnO Powders
Authors: Shi Yong Sheng , Mai Di , Zhao Hui Rong
Published: May 2011

This article uses the hydrothermal method to prepare the high dispersion spherical ZnO powders, The phase composition and microstructures of powders were characterized by X-ray diffraction (XRD), scanning electron microscopy analysis (SEM). The influence to phase compose and the microstructure of ZnO powders were investigated with the forerunner fluid pH value, the hydrothermal response temperature. The growth mechanism of ZnO powders was explored in the alkaline environment. The result indicated: Under the alkalinity condition, ZnO crystalling phase do not change with the pH value, and is for spiauterite structure. When pH value was 8 approximately, the sole sphere ZnO powders are prepared, and the ZnO powders has good dispersivity, uniformed powder particle size distribution, and the particle size is about 1.5mm. The mechanism of forming sphere ZnO pellet is reduced the concentration of OH- ion in solution, and suppressed the growth speed of the fast growth direction, and caused each direction growth same speed.
Synthesis of Ti3SiC2 via Modified-SHS System through Arc Melting
Authors: Mohamed Julie Juliewatty , Chee Hung Phua , Ahmad Zainal Arifin
Published: May 2011

Inter-metallic compound of Ti3SiC2 was produced via modified-SHS (self-propagating high temperature synthesis). Elemental powders of titanium, silicon and graphite were weighed according to their stoichiometric ratios (3:1:2) respectively. These powders were ball milled for 1 hour, then compacted into cylindrical shape. Synthesis of Ti3SiC2 was carried out by using arc melting method. The effect of different arc melting time of 10, 30 and 60 seconds was studied. Phase formation and microstructure were analyzed by using XRD and SEM. The formation of Ti3SiC2 was confirmed by XRD, and the SEM micrograph shows that the grain is in needle shape. XRD result also shows that the impurities are present in all the samples. TiC appeared to be the common and dominant impurity in all samples, with relatively low intensities in Ti5Si3 and TiSi2 phases. Some raw materials phase was still existed in sample arc melted for 10 and 30 seconds. Hence, it can be deduced that the raw materials had not yet fully taking part in the formation of Ti3SiC2.
Synthesis, Crystal Structure and Antimicrobial Activity of a Mixed-Ligand Copper (II) Complex [Cu(pht)2 (phen)H2O]
Authors: Hu Xi Lan , Jiang Qin , Xu Xing You
Published: May 2011

A novel mixed-ligand copper(II) complex [Cu(pht)2(phen)H2O] (Hpht = 5,5-diphenylimidazolidine-2,4-dione, phen = 1,10-phenanthroline) was has been synthesized solvent-thermally and characterized by elemental analysis, IRand single-crystal X-ray diffraction. The crystal of the copper complex belongs to Triclinic system with space group P1, a = 11.747(14), b = 12.639(15), c = 14.021(17)Å, α= 97.986(18)º, β= 104.958(18) º, γ= 108.485(19) º, V = 1851(4) Å3, Dc = 1.371 g/cm3, Z = 2, F(000) = 790, µ = 0.644mm-1, R1 = 0.0835, wR2= 0.1436 [I>2σ(I)] and GOF＝0.867. The X-ray data showed that the Cu(II) atom adopted a distorted CuN2O3 square pyramidal configuration when coordinated with two phen ligands and one water ligand. The antimicrobial activity of the title complex was evaluated against a series of fungi or bacteria in vitro by agar method and the filter paper method, respectively．The results showed that the title complex was more active against the Fusarim gramine arum, Escherichia coli and Staphylococcus Aureus than its precursor Hpht and Cu(Ac)2×H2O.
The Investigation of Back-Mixing Particles near Dust Outlet in Cyclone Separator with Tangential Inlet
Authors: Tan Hui Min , Wang Jian Jun , Jin You Hai
Published: May 2011

Based on experimental and computational fluid dynamics analysis, the phenomenon of particle back-mixing near the dust outlet in cyclone separator with tangential inlet was studied. The results show that particle back-mixing appears near the dust outlet geometry. Particle back-mixing can be divided into dust hopper back-mixing and discharge cone back-mixing for different generation mechanism. The upward flow coming from dust hopper, which occupies 17.7% of the inlet gas, can induce dust hopper back-mixing. The particle mass flow rate that caused by dust hopper back-mixing occupies 46.6% of total inlet particle mass flow rate. Precessing vortex core, bias flow and high turbulent intensity near the dust outlet can induce discharge cone back-mixing. For both dust hopper back-mixing and discharge cone back-mixing, particle back-mixing is serious near the dust outlet geometry, which occupies 56.8% of total inlet particle mass flow rate. Particle which is smaller than 18μm can mix backward. The axial distribution of particle concentration decreases sharply in a range of 1.5 D (cyclone diameter) height above the dust discharge port. At last, only 2.6% of back-mixing particles with diameter no bigger than 13μm escape from vortex finder. This effect on separator efficiency increases with the particle diameter decreases.
Preparation and Characterization of Bi4Si3O12 Powders by Templates-Hydrothermal Method
Authors: Ning Qing Ju , Wang Bang Qing , Gu Su Hang , Guo Fang Fang
Published: May 2011

Bi4Si3O12 powders are prepared by template -hydrothermal used Bi4Si3O12 as a template made by molten-salt method. The phase composition and morphological characteristics of BSO nanoparticles were analyzed and observed by X-ray diffraction and transmission scanning electron microscopy. The results show that with the salt content of 50wt%, calcination temperature 770°C, it can form a high purity Bi4Si3O12 template. A single Bi4Si3O12 phase can be obtained by template –hydrothermal, with template addition 30wt%, the reaction temperature 240°C, holding time for 24h, and prolonging the reaction time is conducive to Bi4Si3O12 grain growth. The powders have a good dispersion, and size of particles is about 10μm or so, and show a columnar shape.
Research on Preservation of Synsepalum Dulcificum by Coatings
Authors: Liu Cheng Lun , He Chun Lan , Xie Tai Ping , Yang Yu E , Liang Ting Xia
Published: May 2011

The preservation of Synsepalum dulcificum has been researched by using chitosan coating as the antistaling agent at room temperature. The physicochemical indexes, such as rot rate, weight loss ratio, scavenging capability of DPPH• radical, total acidity and sensory quality, were assayed during the process of storage. The optimum formulation of the fresh-keeping agent was as follows: 1.5% chitosan, 1% ascorbic acid, 0.1% Tween-80 and 1.0% glycerol. The results showed that the coating films could effectively decrease the loss of fruit nutrition and weight-loss ratio, inhibited the respiration and delayed the senescent course during storage.
Copper Phthalocyanine/Fe3O4 Nanocomposite for Photocatalytic Degradation of Methylene Blue under Visible Irradiation
Authors: Wang Kun , Dai Li Na , Li He Nan , Ju Chang , Liu Wei , Jin Yi Cong
Published: May 2011

Magnetically separable copper phthalocyanine/Fe3O4 (CuPc/Fe3O4) core–shell nano- composites were prepared by an organic-inorganic complexation technique, which could effectively catalyze photodegradation of the model pollutant methylene blue (MB), using hydrogen peroxide as oxidant under visible light irradiation. Moreover, the as-prepared functional nanocomposites could be easily separated from the photodegradation system by using an external magnetic field, which still kept high photocatalytic activity after 5 time’s continual utilization.
Laser Repair Cladding of Ni-Base Alloy on TC2 Ti Alloy
Authors: Chen Chang Jun , Cao Qin , Zhang Min , Chang Qing Ming , Zhang Shi Chang
Published: May 2011

An attempt has been made to fabricate Ni-base alloy layer on the surface of TC2 titanium alloy substrate by laser repair cladding technology for repairing the worn surface of TC2 alloy after in service. Laser cladding is carried out by melting the preplaced Ni-base alloy powder using a continuous wave CO2 laser and using Ar as shielding gas. Microstructure and chemical composition of the cladding coating was revealed by optical microscope (OM), scanning electron microscope (SEM), together with the energy dispersive X-ray spectroscope (EDS). A clad layer with low dilution and metallurgically bonding coating to the substrate could be obtained. A significant improvement in microhardness is achieved in the cladding layer and at the interfacial region. The results showed that laser repair cladding is highly promising technology to restore damaged Ti alloy parts.
A Magnetoelectric Screw Dislocation Interacting with an Elliptical Inhomogeneity Containing a Confocal Rigid Line
Authors: Jiang Chun Zhi , Liu You Wen , Xie Chao
Published: May 2011

Based on the complex variable method, the magnetoelectroelastic interaction of a generalized screw dislocation with an elliptical inhomogeneity containing a electrically conductive confocal rigid line under remote anti-plane shear stresses, in-plane electric and magnetic loads is dealt with. The generalized screw dislocation is located inside either the inhomogeneity or the matrix. The analytical-functions of complex potentials for stresses, electric displacement fields and magnetic induction fields in both the inhomogeneity and the matrix are derived. The image force acting on the dislocation are also calculated explicitly. The results show that the influence of the rigid line on the interaction effect between a generalized screw dislocation and an elliptical inhomogeneity is significant. In addition, the material behavior also plays an important role on the image force.
The Impact of PH on HPAM Removal from Daqing Oilfield Produced Water Using Clay and Organoclay
Authors: Cao Xiao Chun , Guo Hong Yan , Li Yan Yu , Chen Miao
Published: May 2011

The simulated water was treated using the clay and the organoclay. Then, HPAM removal efficiency was compared with the produced water. The results show that both the clay and the organoclay could be used to remove HPAM. However, pH value had different effects on the simulated water and the produced water, maybe due to residue oil droplets and other impurities. The micro structures were observed with particle imager and scanning electron microscopy (SEM).
Numerical Simulation of Square Cup Deep-Drawing Process under the Different Constraint Degrees Condition
Authors: Xiao Xiao Ting , Huang Li Cheng , Liao Yi Juan
Published: May 2011

In this paper, numerical simulation of square cup deep-drawing process under the different constraint degrees condition was investigated by means of advanced analysis software Dynaform5.5. The influence of different constraint degrees on the forming quality were analyzed by taking the inflow volume while parts forming 120mm as standard. The results showed that the effect of the uneven flow and deformation of metal have become bigger and bigger with the increase of constraint degrees. The rounded area at the bottom of square cup is no longer the most easy broke location, and the thickness of long side reduce little and uniform than other place.
Study on Cavitation Erosion Properties of Stainless Steel Vane Wheel Enhanced by Electro-Spark Deposition (ESD) Technology
Authors: Chen Chang Jun , Su Yan Zhan , Cao Qin , Zhang Min
Published: May 2011

In this paper, Electro-Spark Deposition (ESD) technology was used to enhance the cavitation erosion resistance of the stainless steel. The microstructure and composition of the deposition layers were studied by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive Spectrometry (EDS) on cavitation erosion resistance was investigated. The microhardness was measured too. The cavitation erosion resistance was measured in ultrasonic equipment. The preliminary study confirmed that the cavitation erosion resistance of the deposition layer was enhanced compared to the untreated substrate. Now, vane wheel made of cast-iron, stainless steel and oil bump damaged by cavitation erosion have been repaired by ESD. And the properties of the repaired vane wheels were the same as the new ones.
Comparative Static Blu-Ray Recording Properties for Three Metal(II) Complexes in Spin-Coated Films
Authors: Chen Zhi Min , Wu Yi Qun , He Chun Ying , Wang Bin , Gu Dong Hong , Gan Fu Xi
Published: May 2011

Smooth thin films of three metal(II) complexes were prepared by spin-coating process from 2,2,3,3- tetrafluoro-1-propanol solution and characterized atomic force microscopy (AFM). In order to examine their possible use as blu-ray recording media, the spin-coated films of the metal(II) complexes on K9 glass substrate with a silver reflective layer were evaluated by static optical recording testing system with a 406.7 nm laser. The morphologies of the thin films are smooth and have a root mean square surface roughness (RMS) of 0.34-0.41 nm with in 5 μ × 5 μ area. The results of the static optical recording test demonstrate that high reflectivity contrast (> 54 %) can be obtained at an optimum laser writing power and pulse width with high-to-low polarity, and the recording marks are durable even after 15000 times readout. In addition, the recording marks on the cobalt (II) complex thin film are very clear and circular, and their size can reach 200 nm or less.
Characteristics of Rich Phytic Passivator without Cr for Brass Strip
Authors: Cai Wei , Liu Ren Hui , Yang Hong , Xiao Xiang Peng
Published: May 2011

The surface of brass strip is easily oxidized to cause discoloration when exposed in the air. If it contacts with the electrolyte, there will be an electrochemical reaction in the surface that lead to increasing dezincification corrosion. To improve the anti-tarnish ability, the best method is to form a protective membrane in the strip surface. Phytic acid is easily formed a stable chelate complex compound with metal ions, so that forming a dense layer to protect brass strip. It is necessary to develop a new type surface passivator which rich in phytic acid and aquae hydrogenii dioxide but without Cr which pollutes the environment. The study results show that: This passivator enable the anti-tarnish capacity significantly, and do much better results and without so much pollution than now often used dichromate passivator. The passivator solution is stable and can use longer.
The Influence of Sinterng Temperature on the Phase, Microstructure and Textual Properties of Hollow Hydroxyapatite Microspheres
Authors: Wang Ying Chun , Huang Wen Hai , Yao Ai Hua , Wang De Ping
Published: May 2011

A simple method to prepare hollow hydroxyapatite (HAP) microspheres with mespores on the surfaces is performed using a precipitation method assisted with Li2O-CaO-B2O3(LCB) glass fabrication process. This research is concerned with the effect of sintering temperature on the microstructure evolution, phase purity, surface morphology, specific surface area, and porosity after sintering process. The microspheres were sintered in air atmosphere at temperatures ranging from 500 to 900 °C. The starting hollow HAP microspheres and the sintered specimens were characterized by scanning electron microscope, X-ray diffractometer, specific surface area analyzer, and Hg porosimetry, respectively. The as-prepared microspheres consisted of calcium deficient hydroxyapatite. The results showed that the as-prepared hollow HAP microspheres had the highest specific surface areas, and the biggest total pore volume. The pore size distribution of the as-prepared hollow HAP microspheres were mainly the mesopores in the range of 2～40 nm. The specific surface area and total pore volume of hollow HAP microspheres decreased with increasing sintering temperature. Whereas the mean pore size increased with increasing sintering temperature. It showed that at 700°C, Ca-dHAP decomposes into a biphasic mixture of HAP and β-calcium phosphate(TCP).
Density Functional Theory Investigating Interlayer Structure and Ion-Exchange Properties of Mg/Al Layered Double Hydroxides
Authors: Pan Guo Xiang , Cao Feng , Yang Jin Tian , Ni Zhe-Ming , Tang Pei Song , Chen Hai Feng , Lv Sha Sha
Published: May 2011

The two-sheets model was proposed to investigate interlayer structure and properties of Mg/Al layered double hydroxides (LDHs) containing F-, Cl-, Br-, I- and OH- using density functional theory (DFT). The results show that four types of halogen anions in the interlayer of LDHs have the same configurations due to simple sphere structures of isolated anions. As the size of halide anions increasing, the interlayer spacing dc increase. Mulliken charge analysis illustrates that the host layers interact with the guest anions by the electrostatic interaction and hydrogen bonding, and the charge transfers from anions to layers. The frontier orbital of the host layer interacts with that of the guest anions, and the electron transfers from HOMO of anions to LUMO of the host layer. Moreover, the order in the absolute value of binding energy is: OH- >F- >Cl- >Br- >I-, that remains consistent with ion-exchange ability of LDHs reported.
Analysis of Torque in Magnetorheological Rotary Brake
Authors: Wang Ping , Huang Jin , Wei Shu Hua
Published: May 2011

A magnetorheological (MR) rotary brake is a device that transmits torque by the shear stress of the MR fluids. In this paper, Bingham model is used to describe the constitutive characteristics of MR fluids subject to an applied magnetic field. The operational principle of the MR rotary brake is introduced. The torque transmitted by MR fluids is analyzed to compute the torque transmission ability in the MR rotary brake.
High Temperature Oxidation Properties of Cr/C Coating on 4Cr10Si2Mo Steel by Plasma Immersion Ion Implantation and Deposition
Authors: Chang Yun Peng , Xi Hui Zhi , Shao Shu Ai
Published: May 2011

Thin Cr/C film was synthesized on 4Cr10Si2Mo steel substrates by Plasma Immersion Ion Implantation and Deposition (PIIID). The high-temperature oxidation behavior of Cr/C Coating at 900°C for 100 hours in air atmosphere was investigated. The results show that the Cr/C coating on 4Cr10Si2Mo steel by PIIID process has excellent high-temperature resistance and antioxidant properties. After the oxidation behavior for 100 hours, the surface of coated specimen maintains completely and the Cr/C coating has a good bonding force with substrates. The composition of the oxidation scale and the surface morphology were studied by using XRD and SEM. An uncoated sample and a hard chromium plating sample with same substrate took part in the experiment in same condition for comparing.
Adsorption of Cu(II) Ions from an Aqueous Solution by Cross-Linked Carboxymethyl Konjac Glucomannan
Authors: Niu Chun Mei , Li Shao Ying , Huang Dong
Published: May 2011

Crosslinked Carboxymethyl Konjac Glucomannan(CMKGM) with substitution degrees ofcarboxymethyl group（DS）0.265, 0.457 and 0.586 were prepared through reaction of monochloroacetic acid, konjac glucomannan(KGM) and epichlorohydrin and used to adsorb Cu(II) from the aqueous solutions of copper nitrate. The effects of pH, adsorbent dose, initial concentration of Cu(II), adsorption time and temperature on adsorption capacity were investigated. The results showed that adsorption capacity increased with an increasing DS of the carboxymethyl groups. Equilibrium adsorption time was 20 min or so and was independent on DS. The adsorption followed Langmuir isotherm equation. Ligand ion adsorption between carboxymethyl group and Cu(II) was thought to be predominate in the process of adsorption according to the relationship between DS and thermodynamic parameters. CMKGM can be used as cheaper and more effective adsorbents.
Ultrasonic-hydrothermal Synthesis and Characterization of Mesoporous Anatase TiO2 Microspheres
Authors: Li Hai Bin , Chen Shu Guang , Lu Wei Ming , Liu Qi Cheng
Published: May 2011

Mesoporous TiO2 microspheres with a combination of large surface and high crystallinity were fabricated by an ultrasonic-hydrothermal method with Octadecylamine as a structure-directing agent and tetrabutyl titanate as a precursor. The mesoporous materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption–desorption measurements, and UV–visible diffuse reflectance spectroscopy (UV-vis). Low-angle XRD and TEM images indicated that the disordered wormhole-like mesoporous architecture of TiO2 microspheres with diameters of about 200-400 nm were actually formed by agglomerization of nanoparticles with an average size of about 10nm. The analysis from N2 adsorption–desorption isotherms showed that the surface area of mesoporous sample was 204.7 m2g-1, with a pore size of 4.3 nm and pore volume of 0.263 cm3g-1 after calcined at 673 K.
Residual Stress Analysis in Different Thickness TiN Coatings on High-Speed-Steel Substrates
Authors: Mei Fang , Sui Guang Zhou , Gong Man Feng
Published: May 2011

TiN coatings were deposited on AISI M2 high-speed-steel (HSS) substrates by multi-arc ion plating technique. The thickness of substrate was 1.0 mm and five thicknesses of TiN coatings were 3.0, 5.0, 7.0, 9.0 and 11.0 μm, respectively. X-ray diffraction (XRD) has been used for measuring residual stresses. The stresses along five different directions (Ψ=0°, 20.7°, 30°, 37.8° and 45°) have been measured by recording the peak positions of TiN (220) reflection for each 2θ at different tilt angles Ψ. Residual compressive stresses present in the TiN coatings. Furthermore, the results revealed that the value of the residual stresses in TiN coatings was high. While the coatings thickness changed from 3 to 11 μm, the residual stresses varied from -3.22 to -2.04 GPa, the intrinsic stresses -1.32 to -0.14 GPa, the thermal stresses -1.86 to -1.75 GPa. The residual stresses in TiN coatings showed a nonlinear change. When the coatings thickness was about 8 μm, the residual stresses in TiN coatings reached to the maximum value.
Prepare and Performance Research on PVA/TiO2 Composite Films
Authors: Hao Xi Hai , Li Fei
Published: May 2011

Polyviny alcohol (PVA)/ Titanium dioxide (TiO2) composite films with diffrernt content of nano- TiO2were prepared by solution casting method. The structure of the film was characterized by FT-IR,and the water tolerance, viscosity, and light transmission rate of composite membrane were tested. The results showed that Nanometer TiO2 had strong hydrogen bonding interaction with PVA molecules, and with the increasing additive amount of nanometer TiO2, water resistance was improved, the viscosity of the composite sol rised, and the rate of UV transmission decreased obviously.
Study on Direct Reactive Compatibilization of HDPE/Wood-Flour Composites
Authors: Li Yuewen , Chen Xin Hua
Published: May 2011

Reactive compatibilization between high-density polyethylene(HDPE) and wood-flour was achieved via direct reactive extrusion of maleic anhydride(MAH), initiator, HDPE and wood-flour. Impact rupture surface of the composites was observed by scanning electron microscope(SEM), and its load deformation temperature(HDT) and mechanical properties were tested. Effect of MAH dosage, initiator activity and extrusion temperature on the reactive compatibilization was analysed. The result indicated that the anchoring strength of interface in the composites was obviously strengthened and its HDT, tensile strength, flexural strength, notched impact strength and elongation at break were distinctly improved due to the addition of MAH and dicumyl peroxide(DCP). When the composites were extruded at 180°C, the peak values of its HDT, tensile strength, flexural strength, elongation at break and notched impact strength respectively were 79°C, 34Mpa, 36Mpa, 30% and 10KJ.m-2, which respectively increased by 10°C, 62%, 33%, 200% and 150% than that of the composites without reactive compatibilization, and when the composites were extruded at 200°C, the peak values of its HDT, tensile strength, flexural strength, elongation at break and notched impact strength respectively were 78°C, 34Mpa, 36Mpa, 24% and 8KJ.m-2, which respectively increased by 12°C, 55%, 33%, 200% and 100% than that of the composites without reactive compatibilization. In the case of DCP and MAH as compatibilizer, there was an optimum dosage of MAH. The optimum dosage was shifted forward as extrusion temperature increased.
Radiative Transition Properties of Tm3+ in Aluminum Germanate Glass for FWW Waveguide Amplifier
Authors: Zhang Jie , Lin Lin , Chen Min , Lin Hai , Zhao Xin
Published: May 2011

Dominant 794nm wavelength upconversion emission, which originates from the Tm3+: 3H4®3H6 transition, has been recorded in Tm3+/Yb3+ codoped aluminum germanate glass under the 974nm wavelength laser excitation. Judd-Ofelt parameters W2 (6.52´10-20cm2), W4 (9.83´10-21cm2) and W6 (1.02´10-20cm2) indicate a higher inversion asymmetric and stronger covalent environment in the glass material. The spontaneous transition probability of 3H4®3H6 was derived to be 1121s-1, which is responsable for obtaining the powerful 794nm emission. K+-Na+ ion-exchanged multimode channel waveguide amplifiers have been fabricated based on the Tm3+/Yb3+ codoped aluminum germanate glass substrate. The relative gain coefficient of a 2.20cm channel waveguide was determined to be 1.58dB/cm at a signal wavelength of 810 nm under 457mW 980nm laser diode excitation.
Characteristics of Silver Films Deposited on the Surface of PET Fabric
Authors: Meng Ling Ling , Huang Xin Min , Wei Qu Fu
Published: May 2011

PET(polyester) plain woven fabric deposited with nano-structured silver thin film was prepared by RF (radio frequency) magnetron sputtering at room temperature. The effect of different sputtering technical parameters on the morphology and particle diameters of the nano-structured silver thin film was characterized by AFM(atomic force microscope)and the conductivities of silver thin films were also analyzed under different sputtering technical parameters. The results indicated that the nanoparticles size of sliver thin films increased with higher sputtering power, the conductivity of sliver thin films was first decreased and then markedly enhanced; The nanoparticles size of sliver thin films decreased with higher gas pressure, the conductivity was markedly decreased; The nanoparticles size of sliver thin films increased with longer sputtering time, the conductivity was markedly enhanced, The best conductivity was achieved at the sputtering time of 15min.
The Numerical Simulation on Welding Stress Field of High Strength Steel for Axle Case Steel 390Q
Authors: Yu Yan , Wang Feng Xue , Chen Jun , Liu Zhen
Published: May 2011

This paper takes the butt joint of axle case steel as research object, simulates the real-time three dimensional dynamics CO2 shielded welding of welding stress field by FEM software ANSYS and obtains the axle case steel 390Q’s transient stress field of weld zone at different welding speed. On that basis, the feasible dynamic simulation method of three-dimensional stress welding field which provides theoretical basis and guidelines for optimizing welding technology and norm welding parameters was proposed. The result of welding stress simulation shows that the welding stress is the lowest when the optimum welding speed is 5mm/s.
Preparation and its Application Performance of Backfilling Cementation Material Based on Blast Furnace Slag
Authors: Hu Shu Gang , Niu Hai Li , Lu Xian Jun
Published: May 2011

The blast-furnace slag （BFS）has been characterized by chemical and phase composition to evaluate its hydration reactivity. It has high potential activity for its glassy structure, so its use to prepare new filling cementation material is possible. New backfilling cementation material composition has been formulated and optimized by activation of BFS. The optimal formula of new backfilling cementation material SL(Slag activated by lime) and SLG(Slag activated by lime and desulfurization gypsum) was 87% BFS, 13% lime and 78.4% BFS, 11.8% lime, 9.8% desulfurization gypsum respectively. Finally, the feature of application performance was analyzed through comparison between new cementation material and ordinary Portland cement with paste and sand mortar experiment. The result showed that material SL and SLG have superior performance to ordinary Portland cement used to mining cemented filling.
Visible-Light Photocatalytic Property of Titanate Nanotubes Sensitized by Several Porphyrins
Authors: Li Xiang Qing , Liu Li Fang , Kang Shi Zhao , Mu Jin , Li Guo Dong
Published: May 2011

The visible-light photocatalytic activity of titanate nanotubes (TiNTs) sensitized by 5,10,15,20-tetraphenylporphyrin (TPP), 5,10,15,20-tetraphenylporphyrin manganese (MnTPP), 5,10,15,20-tetraphenylporphyrin nickel (NiTPP) and 5,10,15,20-tetraphenylporphyrin zinc (ZnTPP), respectively, was investigated by the photocatalytic degradation of methyl orange (MO) as a probe reaction. The results showed that the central ions of porphyrins had an important influence on the photocatalytic activity of the samples. The activity was in the order of TiNTs-ZnTPP > TiNTs-TPP > TiNTs-NiTPP > TiNTs-MnTPP. Combined the result of absorption spectra with that of fluorescence spectra, it was demonstrated that various visible-light absorption and photoelectron transfer caused by the central ions of porphyrins were the decisive factor for the visible-light photocatalytic activity of the sensitized TiNTs.
The Effect of Impregnation Process on the Performance of Veneer Composite Plank
Authors: Zhen Xing , Pang Jiu Yin , Zhang Shi Cheng , Jiang Ya Zhe
Published: May 2011

This study focuses on the effect of impregnation process on the main mechanical properties in the production of veneer composite plank. The results showed that:①Under the normal pressure and temperature the drug absorption of impregnated veneer shall extend the volume with the growth in impregnation time, but growing faster early, the later change slowly. In the impregnation process under pressure, its absorption rate and speed are greatly increased. ②The Modulus of rupture (MOR) and modulus of elasticity (MOE) of veneer composite plank are gradually increased with the drug absorption increased, but after reached a certain peak value they gradually decrease, and the variation of MOE is smaller than MOR.
Synthesis and Property of a New Diarylethene Bearing both an Isoxazole Moiety and a Chlorine Atom
Authors: Li Hui , Pu Shou Zhi , Liu Gang , Liu Wei Jun , Cui Shi Qiang
Published: May 2011

A new photochromic diarylethene 1-(3,5-dimethyl-4-isoxazolyl)-2-[2-methyl-5- (3-chlorophenyl)-3-thienyl]perfluorocyclopentene (1o) has been synthesized. Its properties, including photochromism and fluorescence were investigated in detail. It underwent reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in hexane and in PMMA. The results showed that this compound exhibited reversible photochromism and good fluorescent switching after irradiation with UV light and visible light.
Preparation and Performance of Zinc Zeolite-Ce/TiO2 Antibacterial Material
Authors: Wang Qing , He Tian Shu , Da Jing , Liu Jun , Ding Zhao Yang
Published: May 2011

Zinc zeolite-Ce/ TiO2 antibacterial material was prepared through immersion method with anatase nano- TiO2 power as main raw materials, zinc zeolite as carrier and cerium ions as doping ions. Its antibacterial function was evaluated by detecting the inhibition zone, the light-catalyzed effect of pure TiO2 antibacterial material was contrasted with zinc zeolite-Ce/ TiO2 antibacterial material by using ultraviolet spectrum. The results showed that zinc zeolite-Ce/ TiO2 antibacterial material had strong bacteriostasis to escherichia coli. It performed best when the diameter of inhibition zone reached to 34.64 mm under the condition of the ratio of nano-TiO2 to cerous nitrate was 40:1, the reacting time was half an hour, the maturing temperature was 300°Cand pH value was equal to 3.
Synthesis, Photochromism and Holographic Optical Recording of a Photochromic Diarylethene with a Chlorine Atom
Authors: Wang Li Qin , Pu Shou Zhi , Liu Wei Jun
Published: May 2011

A new unsymmetrical photochromic diarylethene 1-(2-methyl-benzothiophenyl)- 2-(2-methyl-5-(2-chlorophenyl))perfluoroncyclopentene (1a), was synthesized and its optoelectronic properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, fluorescences and the fluorescence spectra of diarylethene 1a depended on the concentration were investigated. Using diarylethene 1/PMMA film as recording medium and a linearly polarized 633 nm laser diode for recording and readout, polarization multiplexed image recording can be carried out in this film, which illustrated that the diarylethene can be potentially used as holographic optical recording medium.
An Investigation on Anti-reducing Effect of CaO in Barium Titanate Based Ceramic
Authors: Wang Sen , Li Zhi Hui , Liu Xin , Zhang Huan
Published: May 2011

Anti–reducing effect of CaO in barium titanate based ceramic materials sintered at reducing atmosphere and the structure development of the materials has been studied in this paper.The results show: Addition of CaO in barium titanate based ceramic will keep resistivity of the sample sintered at reducing atmosphere at a high level. The resistivity of the materials increase with the increasing of CaO, and the resistivity keep in constant after the amount of CaOexcess 3mol%. In the sample with sintering aid of SiO2 and BaO-excess, introducing of CaO may improve the resistivity of the materials obviously. A slight new phase formation was found in the BaO-excess sample, but no new phase formation was found in the non BaO-excess sample. If there is sintering aid of SiO2 in the sample, CaO may accelerate liquid phase film formation at the surface of grains, which will suppress the diffusion of oxygen in the grains to the environment.
Development of Low-Cost LX70A Rod for Steel Cord
Authors: Cao Shu Wei , Kang Yong Lin , Wang Xin Jiang , Han Qi Hang
Published: May 2011

Steel cord has the higher technical requirement in the production of wire rod. And the higher requirement of the structure uniformity brings about the more difficulty for producing wire rod. Therefore, the procedure of rod for steel cord has been studied at Anyang Iron & Steel Group Co., Ltd. It has been investigated the low-cost production process, inclusion control, composition segregation, chemical composition control, structure performance control and application of LX70A rod for steel cord. The present research has significant value for the application of similar products.
Synthesis and Characterization of EuL3(phen) Luminescent Complex
Authors: Ren Hui Juan , Sun De Hui , Cui Zhen Feng , Hong Guang Yan
Published: May 2011

The europium(III)-benzoic acid(HL)-1,10-phenanthroline(phen) complex was synthesized in the ethanol-H2O system by a precipitation method. The morphology of the minicrystal complex with diameters of ca. 1.0 µm is characterized by scanning electron microscopy (SEM). Elemental analysis and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) are used to determine the chemical composition of the complex. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analysis (XRD) are used to examine the structure of the complex. The results show that the complex is a new kind of crystalline complex and the composition of the complex is speculated to be EuL3(phen). The thermogravimetric curve (TGA) analysis indicates that the complex is stable below 232 °C in air. The photoluminescence analyses (PLA) exhibit that the complex emits the characteristic red fluorescence of Eu (III) ions at 613nm under ultraviolet light excitation.
CsH2PO4: Electrolyte for Intermediate Temperature Fuel Cells
Authors: Teo Hock Chee , Shyuan Loh Kee , Mohamad Abu Bakar , Kadhum Abdul Amir Hassan
Published: May 2011

This review paper discusses the temperature behavior and thermal event of cesium dihydrogen phosphate (CsH2PO4) in both ambient and high pressure atmosphere. A complete transition from the room-temperature to a high-temperature of CsH2PO4 (monoclinic to cubic phase) occurs between 230 to 240 °C, even in the absence of humid conditions and the superprotonic transition precedes the onset of the dehydration/chemical decomposition of the title compound. Decomposition or dehydration can be avoided by either keeping the sample under a H2O-saturated atmosphere, or subjecting the sample to a pressure of 1.0 ± 0.2 GPa.
Devulcanization of Waste Tire Rubber Vulcanizate through a Mechanochemical Pan Milling at Ambient Temperature
Authors: Sui Jian Bo , Xiang Dong , Mou Peng , Duan Guang Hong
Published: May 2011

The partially devulcanization of waste tire rubber vulcanizate was carried out with the newly developed mechanochemical pan mill, which can exert fairly strong compressing and shearing force on the milling materials and avoid the agglomeration phenomenon. The experimental results indicate that the particle size is greatly reduced and the surface is fluffier, crosslink density is reduced to one half without large degradation and heavy damage of rubber backbones. The study of mechanical properties of revulcanizate of SBR and waste tire rubber blends at 1:1 ratio indicates that elongation at break increased from 302% to 447.6%. But the properties of tensile strength, modulus and hardness are reduced. The mechanochemical pan milling process is a simple, low cost and environmental-benign process for waste tire rubber devulcanization at ambient temperature without any use of chemicals and can be used at commercial-scale.
Research on Microwave Sintering Process for High Strength HA Porous Scaffold
Authors: Wu Quan , Zhang Xiang Lin , Li Meng Jun
Published: May 2011

This paper investigated solid freeform fabrication(SFF) and microwave sintering processes of high strength HA porous scaffold. A newly developed SFF method called motor assisted micro-syringe freeform fabrication system was introduced to construct HA scaffolds. Sintering conditions that influenced the phases, microstructure and mechanical strength of scaffolds were discussed. Study of microstructure images and strength test results showed that densification and grain size were found to play an important role in determining the mechanical properties of sintered porous scaffolds, and microwave sintering process could get a sintered scaffold with small grain size and uniform structure more rapidly at lower sintering temperature than that of the conventional sintering. The fabricated HA scaffolds with controlled architecture (interconnected macro pore of 200-400μm, micro pore of 1-10μm within the rods) and improved mechanical properties (45.2MPa, 56.2% porosity ) may find potential applications in bone tissue engineering.
Optimum Design of Plastic Injection Mould Gate Based on MoldFlow
Authors: Liu Xi Fen , Hu Yi Hua , Huang Wei Jian
Published: May 2011

In view of the importance of proper gate location and size in mould design process, with the basic analog theory for simulating the filling process of plastic melts in the cavity of injection moulds, injection moulding CAE technology was proposed for the optimum design of gate location and size. Based on Moldflow software, the analysis process of the best gate location and size was stated. The gate location and size and injection moulding technical parameters were optimized in this paper by example. The optimal rectangular gate dimension was 5mm×2.5mm, filling state was fine, filling time was reduced from 0.72s to 0.69s. It was resulted in products of high previewed quality, reduced the cost of production and enhanced the competitive power of mould enterprises.