bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Chelating Agents as Cooking Aids in Bamboo Pulping
Authors: Gao Hong Xia , He Wen Hua , Guan Xiu Qiong , Liu Chun , Yuan Bo
Published: August 2013

The effect of chelating agents Diethylene Triamine Penta Methylene Phosphonic Acid in bamboo kraft cooking was studied. The results show that the bamboo pulp yield was 49.52% when DTPMPA dosage is 0.4%, at the same time the Kappa number was lower. With the increasing of DTPMPA dosage in bamboo kraft pulping, the bamboo pulp strength was increased.
Effects of Radix Platycodonis Polysaccharide on Expressions of IFN-γ, IL-4 and IL-5 in the Bronchoalveolar Lavage Fluid and Nf-κВ in the Lung Tissue of Asthmatic Rats
Authors: Huang Xiao Dong , Zhao Xing Yu , Wang Yan Chun , Ying Jian
Published: August 2013

Objective: To investigate the effect of Radix playtycodoni polysaccharide (RPPS) on rats with ovalbumin-induced asthma and its mechanisms. Methods: 48 Wistar rats were randomly divided into blank control group, asthma model group, dexamethasone control group (1 mg / kg), and high-dose RPPS group (40 mg / kg), moderate-dose RPPS group (20 mg / kg) and low-dose RPPS group (10 mg / kg). The ovalbumin sensitization method was used to establish the asthma model in rats. The rats were given it in the atomization administration for two weeks and then were sacrificed. The BALF was collected for the count of eosinophils (EOS); enzyme-linked immunosorbent assay (ELISA) method was employed for the determination of IL-4, IL-5, and IFN-γ levels in BALF; the expression of NF-κВ in the lung tissues was measured by Western blot. Results: Compared with the model group, RPPS could reduce the number of EOS in blood and BALF, increase the content of IFN-γ in BALF, lower IL-4 and IL-5 contents, and down-regulate the expression of NF-κВ protein in rats with asthma. Conclusion: RPPS can inhibit the airway inflammation in asthma, down-regulate the expression level of IL-4 and IL-5, up-regulate the IFN-γ level to regulate the abnormal immune status induced by the imbalance of TH1/TH2 in asthma and inhibit the expression of NF-κВ, which may be one of the mechanisms of its anti-inflammatory activity.
A New Rice Husk-Plastic Composite Powder Preparation Process for Selective Laser Sintering Fabrication
Authors: Zeng Wei Liang , Guo Yan Ling , Liu Ying , Gong Yan Ping , Zhao Pei Feng , Li Chi Lei , Zhao Jian Wei
Published: August 2013

A new powder material, rice husk-plastic composite powder (RPC), was successfully developed for selective laser sintering (SLS) process. RPC is mainly composed of rice husk powder and a hot-melt adhesive powder, it is a green and biological material and its most important advantage is low-cost, but because the hull surface of rice is burr and not smooth, easily jammed between particles, poor mobility, is not the medium of easy flowing, so mixing process was successfully developed to prepare RPC powders. The preparation process is divided to three steps. First, before mix, the rice husk power is dried for reducing the hydrophilic nature of rice husk fiber and improving the wettability and the adhesion actions of the interface. Then, put the PES hot melt adhesive, the dried wood powder and the acetone solution which contain coupling agent and initiator together to mix evenly. At last, dry the basic material at the constant temperature of 45±2°C in the oven, add the organic filler and light stabilizer. Finally, RPC powder for SLS is got. As the result of SLS fabrication, part made by RPC powder is got, its mechanical properties and dimensional accuracy is satisfied.
Isolation and Biological Activities of Citral from Sweet Orange Oil
Authors: Xu Xiao Lin , Zhu Qing , Lv Hui , Wu Wen Hui , Lv Min , Liu Ke Hai
Published: August 2013

The purpose of this study was to isolate citral from sweet orange oil by combined usage of molecular distillation and column chromatography. Additionally, the antioxidant activity (by DPPH radical scavenging activity and reducing power) of citral was evaluated. A significant and linear correlation coefficient between the antioxidant activity and the concentration of citral was found (R2=0.9925). On the other hand, the cytotoxic effects of the citral against tumoral human cell line Hela was examined by MTT assay and the IC50 values was 32.56 μg/mL. Overall, results presented here suggest that the citral possesses antioxidant activity and cytotoxic properties, and is a potential source of active ingredients for food and pharmaceutical industry.
The Formation of Plasma Acid at Atmospheric Pressure and its Application in Hydrolysis of Microcrystalline Cellulose
Authors: Yuan Bo , Wang Ying , Ji Ying Chao , Wang Qiu Hong
Published: August 2013

In this paper, plasma acid was obtained by treating distilled water with dielectric barrier discharge at atmospheric pressure in order to hydrolyze cellulose. The acidity of plasma acid was studied through a single factor experiment. A plasma acid with pH value of 1.42 was obtained and used to hydrolyze microcrystalline cellulose at 80°C for 60min. Under this condition, the integrated optical density (IOD) of the hydrolysis sample was 0.589. Based on standard glucose curve, the total reducing sugar (TRS) was calculated to be 53.75mg and the TRS yield was 53.75%. The filtrate was evaporated to get the solid hydrolysis sample to be analyzed by High-performance liquid chromatography (HPLC). The results showed that the sample mainly consisted of glucose, which proved that microcrystalline cellulose could be hydrolyzed by plasma acid. Therefore, it could be concluded that it was an environmentally friendly and economical method to hydrolyze the microcrystalline cellulose by plasma acid.
Research and Evaluation of High Temperature Plugging Agent
Authors: Shen Peng Fei , Chen Yong Sheng , Li Ling , Ni Yin , Zhao Na , Luo Wan Jing
Published: August 2013

Superfine cement is an ideal grouting material of high-performance ultrafine particles. It has excellent permeability, higher strength and durability. One of the most important features of superfine cement is no pollution on environment. SHD and SCC are two kinds of cement which have different performance. Comparing particle size, initial setting time, compressive strength and plug rate of two kinds of superfine cement by experiment. The result of experiment shows that cement SCC has higher compressive strength and plug rate at higher temperatures.
Carbonization Regime Process of Coal Tar Refined Soft Pitch
Authors: Gao Li Juan , Zhao Xue Fei , Lai Shi Quan , Liu Yan Xial
Published: August 2013

The thermal behavior of coal tar refined soft pitch (CTRSP) was investigated by using polarizing microscope with heating stage and thermogravimetric analyzer. The phenomena of carbonization regime process of CTRSP were observed directly in the micro-picture taken online. The results showed that the carbonization thermal dynamic process of CTRSP is divided into several typical stages. At 30-250°C,there is small molecular evaporation; at 250-390 °C,there is thermal decomposition and small molecular evaporation; at 390-480°C,there is the condensation of small molecules and radicals into macromolecules and directional arrangement generating small spheres; at 480-520°C,there is the coking stage; at 520-560°C, there is the semicokes dehydrogenation and shrinkage. The spherules are formed at about 390°C. The growth process of the spherules is divided into several stages: absorption optical isotropic matrix asphalt to grow, two spherule collision fusion and growth, finally (at 480-520°C) due to gravity is greater than surface tension small spheroid disintegration deformation and became fibrillar semicoke (at 520-560 °C). Thermogravimetric (TG) - differential thermogravimetry (DTG) curve are treated by Freeman-Carrolls non isothermal differential method, coal tar soft pitchs first-order reaction is from 253°C to 325°C, from 370 °C to 413°C two temperature stages, activation energy is 28.575 kJ/mol and 60.210 kJ/mol, pre-exponential factor is 2.328×106 and 1.4833×107, respectively. The microscopic picture recording was consistent with thermal heavy kinetic equation and the results confirmed that the chief of thermal decomposition reaction is operated from 253 °C to 325 °C, the most of condensation polymerization reaction is operated from 370 °C to 413 °C.
Synthesis, Structures and Properties of Two New Three-Dimensional Ce(III) Coordination Polymers with 2,2'-Bipyridine-4,4'-Dicarboxylic Acid
Authors: Zheng Rui Ping , Chen Hui Yuan , He Jun Jie , Zeng He Ping
Published: August 2013

Two new Ce(III) coordination polymers formulated as Ce(bpdc)(Hbpdc)(DMF)2 (1) and [Ce2(bpdc)3(DMF)2(H2O)4]·2DMF (2) (H2bpdc = 2,2'-bipyridine-4,4'-dicarboxylic acid, DMF = N,N-Dimethyl formamide) have been synthesized under solvothermal condition and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in monoclinic, space group C2/c with a = 2.2520(2), b = 1.17787(12), c = 1.16128(11) nm, α = 90, β = 95.5600(10), γ = 90°, V = 3.0658(5) nm3, Z = 4, Mr = 771.70, Dc = 1.672×10-9 g/cm3. Compound 2 crystallizes in triclinic, space group Pwith a = 1.00610(10), b = 1.17219(11), c = 1.36891(14) nm, α = 66.9340(10), β = 87.182(2), γ = 76.2570(10) °, V = 1.4411(2) nm3, Z = 1, Mr = 1371.25, Dc = 1.580×10-9 g/cm3. Both compounds exhibit 3D Ce(III)–organic frameworks. Furthermore, thermal stability and luminescent properties were also investigated. CCDC:(1)913670, (2)909563.
Synthesis and Crystal Structure of a Novel 3D Sm(III) Coordination Polymer with Mixed Ligands
Authors: Wang Shu Ju , Tian Yan Wen , You Li Xin , Sun Ya Guang
Published: August 2013

The coordination polymer, [Sm2(HPyImDC)2Ox (H2O)2·6H2n [H3PyImDC = 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylic acid, Ox = oxalate], has been synthesized under hydrothermal conditions and characterized by elemental analysis, FT-IR and single crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 28.166(6), b = 6.9970(14), c = 16.655(3) Å, V = 2685.4(9) Å3, Z = 4, Dc= 2.298 g/cm3, μ(MoKα) = 4.428 mm-1, F(000) = 1852, the final R = 0.0412 and wR = 0.1010. The complex forms a three-dimensional (3D) framework structure.
Structural and Elastic Properties of Antimony Triiodide from First-Principles Calculations
Authors: Sun Xiao Xiao , Wu Chun Lei , Chen Wei Wei , Liu Hai Sheng
Published: August 2013

First principles calculations are performed to investigate the structural and elastic properties of SbI3 based on density functional theory for two space groups: trigonal R-3 and monoclinic P21/c. The calculated equilibrium structural parameters agree well with the experimental data. The enthalpy calculations confirm that the trigonal R-3 structure of SbI3 is the most stable structure at zero pressure. For R-3 structure, the obtained bulk, shear, and Youngs modulus are 28.1, 15.2 and 38.6 GPa, respectively. The calculated Debye temperature is 197 K. SbI3 presents large elastic anisotropy, stronger compressibility and better ductility at 0 GPa.
Synthesis, Characterization, Optical and Electrochemical Properties of Multinuclear Cobaltadithiolene Complex Derivatives
Authors: Zhao Yao Fang , An Jing Hua , Kang Xiao Min , Wu Ya Nan , Zhu Bao Hua
Published: August 2013

Four new multinuclear cobaltadithiolene complex derivatives [Cp*CoFe2(CO)6(η2, μ3-S2C6H2(SC3H7)2)] 1, [Fe (CpPPh2)2(Cp*CoS2C6H2(SC3H7)2)2] 2, [Cp*CoRu (CO)3(CH2=CHCH2) (η2,μ2-S2C6H2(SC3H7)2)] 3 and [Cp*Co (NSO2C6H4CH3)(S2C6H2(SC3H7)2)] 4 were obtained by reaction of mono-nuclear cobaltadithiolene complex [Cp*CoS2C6H2(SC3H7)2] (Cp*=C5(CH3)5) with Fe3(CO)12, Fe (CpPPh2)2 (1,1'-bis (diphenylphosphino) ferrocene), Ru (CO)3(CH2=CHCH2)Br, C6H5I= NSO2C6H4CH3(p) (N-(Phenyliodonio)-p-toluene sulfonamidate), respectively. All new complexes were characterized by C/H analysis, 1H NMR, MS and IR spectroscopy. Furthermore, the optical and electrochemical properties of some complexes were also determined by UV-Vis spectra and cyclic voltammogram (CV) analysis.
Preparation of Highly Dispersed Pt Supported on γ-Al2O3 with Strong Electrostatic Adsorption
Authors: Cheng Jun Jie , Hou Yong Jiang , Guo Jie , Cai Yu Xi , Hao Yan Long
Published: August 2013

The Pt/γ-Al2O3catalyst was prepared by the method of impregnated with chloroplatinic acid (H2PtCl6) under different conditions. The acid-base of the carrier, the pH of impregnate liquid were systemic studied. Only when the pH value in 3.5, the loading of Pt on the carriers is the highest degree of dispersion.Various competitive adsorbents were added to impregnation liquid to improve the dispersion of the Pt. The effect of strong electrostatic adsorption on the dispersion of Pt/γ-Al2O3 catalyst. The characterization of Pt/γ-Al2O3 catalysts were investigated.
Density Functional Theory Study of Intermolecular Interaction between RDX and H2O
Authors: Zeng Xiu Lin , Ju Xue Hai
Published: August 2013

The density functional method of wB97xD in combination of 6-31+G** basis set was applied to the study of the heterodimers between hexahydro-1,3,5-trinitro-1,3,5-triazine and water. Three stable dimers were located. The binding energies have been corrected for the zero-point vibrational and basis set superposition errors. The largest corrected binding energy is 26.21 kJ/mol. Natural bond orbital analyses and frequency calculations were performed on each optimized structure. The thermodynamic properties of enthalpies, entropies and Gibbs free energies in the dimerization process were presented.
Kinetics of Mesophase Sphere Formation of Toluene Soluble Fraction
Authors: Yue Li , Zhao Xue Fei , Lai Shi Quan , Li Xiao Xia , Gao Liang Liang , Hou Ke , Wang Han Shi
Published: August 2013

The toluene soluble (TS) fraction prepared from a middle-temperature coal tar pitch was subjected to a series of thermal treatments at the various temperatures from 410 °C to 470 °C for different periods of time. The samples obtained after heat treatment was quenched to ambient temperature. Mesophase spheres were separated from the quenched samples using washing oil and quinoline. The kinetics of mesophase sphere formation of the TS fraction was studied, based on the data derived from the time-dependent changes in the mesophase sphere content. It was clarified that the mesophase sphere formation of TS fraction was an autocatalytic type reaction. The rate law and the rate constants for the mesophase sphere formation at holding temperatures of 410°C, 430°C, 450°C and 470°C were determined. The rate constants of the mesophase sphere formation follow the Arrhenius equation. The Arrhenius parameters of the mesophase sphere formation are 200.2 kJ mol-1 of the activation energy and 2.71x1012 % -1 h-1 of the pre-exponential factor. The treatment temperature had a greater effect on the formation of mesophase spheres than the treatment time.
Characterization of TiO2/ACF Preparation in Caprolactam Tetrabutyl Ammonium Bromide Ionic Liquid
Authors: Han Jing , Li Chun Jing
Published: August 2013

To explore environmentally benign method for preparing TiO2, composite photocatalysts TiO2 immobilized on activated carbon fibers (TiO2/ACF) were prepared in caprolactam tetrabutyl ammonium bromide ionic liquid (CPL-TBAB ILs). The TiO2/ACF composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that nanoTiO2 particles of mixed grain phase were well deposited on the activated carbon fiber surface.
Study on Electrochemical Corrosion Behavior Comparison between DLC and TiN Coatings under Different Corrosive Environment
Authors: Zhu Wen , Nie Chao Yin , Ran Chun Hua , Jin Yi Dong , Zhao Yang
Published: August 2013

Diamond-like carbon (DLC) and TiN coatings were deposited on the 304 austenitic stainless steel(SUS304) substrates by using unbalanced magnetron sputtering and arc ion plating techniques, respectively. The phase structure and surface morphology of coatings were characterized by SEM and XRD.The electrochemical corrosion of two coatings in different electrochemical solutions (including3.5%NaCl,10%HCl,20%NaOH) were investigated by electrochemical workstation.The result showed that DLC coating was amorphous structure and TiN coating was nano-crystalline structure.The surface of DLC coating was smooth and dense,while TiN coating existed pits.In 10%HCl and 3.5%NaCl solutions,the corrosion resistance of DLC coating increased by 4.16 and 10.9 times compared with SUS304 and increased by 5.16 and 1.11 times compared with TiN coating,respectively.But in 20%NaOH solution, the corrosion resistance of DLC was not superior to SUS304 and TiN coating.In 10%HCl solution,the corrosion resistance of TiN coating increased by 9.81 times compared with 304 SUS304.But in 3.5%NaCl and 20%NaOH solutions,the corrosion resistance of TiN coating was worse than SUS304.
Fabrication of Magnetic Cenosphere Deposited with Fe3O4 Nanoparticles by Hydrothermal Method
Authors: Zhang Hui , Song Jie Yao , Zhan Jian Chao
Published: August 2013

We prepared the magnetic cenospheres deposited with magnetite Fe3O4 nanoparticles under hydrothermal conditions. The crystalline phase, magnetization properties, morphology, chemical composition and thermal stability of asobtained cenospheres are analyzed by Xray diffraction, vibrating sample magnetometer, scanning electron microscope, Xray energy dispersive spectroscope, transmission electron microscope, thermal gravimetric analysis and differential scanning calorimetry techniques. The results show that the inverse cubic spinel phase of Fe3O4 nanoparticles with an average size 50 nm are synthesized, and synchronously deposited on cenosphere surface. As the thickness of Fe3O4 coating increases, the saturation magnetization increases to some extent. The growth of Fe3O4 nanoparticles can be controlled by adding ethanol to the reaction solution.
Effect of Temperature Induced by Laser Irradiation Processing on Fatigue Damage Repairing for Copper Thin Film
Authors: Wang Lu , Shang De Guang , Ren Chong Gang , Guo Yu Bo , Chen Tao
Published: August 2013

Based on laser irradiation processing experiment for repairing damaged copper thin film specimens, the effect of temperature field induced by pulsed laser surface irradiation on fatigue damage repairing of copper thin film was studied by numerical simulation method. First the temperature field of copper thin film after laser irradiation was analyzed by ANSYS under different pulse energies and pulse numbers. Then the surface morphologies of copper thin film specimens were observed by optical microscope before and after laser surface irradiation. The results showed that laser irradiation processing has a better effect on fatigue damage repairing when the temperature induced by laser surface irradiation reaches about 1200 °C. A slightly melted morphology on the surface of copper thin film was observed in this case. In addition, except for the full healing of fatigue damage, the total fatigue life was increased about 2 times at the nominal stress level of 120MPa.
Electrochemical Impedance Spectroscopy Study of Nano-Materials Modified Fluorocarbon Coating of Metal Surface
Authors: Xu Pei Yao , Dong Xiao Bei , Li Yan Qing
Published: August 2013

In this thesis, electrochemical impedance spectroscopy (EIS) testing technology and PowerSuite software fitting techniques were applied to research the antiseptic properties of fluorocarbon lacquer that were modified by nano-TiO2, nano-SiO2, nano-ZnO and unmodified fluorocarbon lacquer. In this experiment, we obtained coating density, electrolyte permeation rate and other information corrosion dynamics related, and evaluated the anticorrosive effect of the modified coating and unmodified coating. The experimental results show that the nano-SiO2 modified fluorocarbon lacquer exhibits advantages in performance comparison.
Synthesis of Carbon Nanocoatings on YG8 Hardmetal Substrates in Oxygen-Acetylene Flame
Authors: Zhu Hong Mei , Lei Shu Mei , Kuang Tong Chun
Published: August 2013

In this paper, carbon nanocoatings were prepared on YG8 (WC-8 wt.%Co) hardmetal substrates by using the oxygen-acetylene flame method. It was shown that the morphology and quality of carbon nanocoatings were greatly affected by the position at which the hardmetal was placed in the flame and the surface pretreatment of the hardmetal. Small nodular particles aggregated by short needles were synthesized on the acid-etched substrate, while cauliflower-like diamond particles were deposited on the mechanically-polished and acid-etched substrate. The cross-section observation indicated that there was a good mechanical interlocking between the deposited diamond coating and the substrate.
Investigating the Application of Nanoscale Bilayers Assembly on Stainless Steel Plate to Evaporation Behavior
Authors: Wu Shen Chun , Hsu Chao Tsai , Yang Wun Hong , Wang Dawn , Li Hsih Shing , Huang Zih Yan , Su Shen Jwu , Chen Yau Ming
Published: August 2013

This study investigates the use of nanoscale bilayers assembly film for hydrophilic modification on stainless steel plate and observed its effect on the plates evaporation behavior in acetone. This study first establishes the technique of nanoscale bilayers assembly, then performs surface hydrophilic modification on stainless steel plate by changing the surface structure, which produces different contact angles. The relationship between layers (0, 5, 10, 15 bilayers) of surface modified and the contact angle is empirically determined, and results show that, similar to findings stated in the literature [, after surface modification the contact angle decreases from 70° (layer 0) to 24° (layers 15); in addition, the results from this study have demonstrated a certain level of technical capability. This study was investigated the evaporation test in a modified surface , also is the first time reported in previous literature. Evaporation tests show that under the best contact angle evaporation rate can be increased by 50%, indicating the high potential of surface hydrophilic modification on stainless steel plate for improving evaporation behavior.
Microstructure and Wear Resistance of ZrC Reinforced Metal Matrix Composite Coating by Gas Tungsten Arc Cladding
Authors: Wang Zhen Ting , Fan Jing Xin
Published: August 2013

The in situ synthesized ZrC particulate reinforced metal matrix composite coating was fabricated on AISI1020 steel by gas tungsten arc (GTA) cladding powder mixture of Nickel, Zirconium and Graphite. The microstructure and wear resistance of the composite coating were investigated. It is shown that the coating is bonded metallurgically to the substrate and has a homogeneous fine microstructure containing both approximate cubic ZrC particle uniformly dispersed in matrix of (Fe,Ni) solid solution. Compared to a substruate, the hardness of the composite coating was increased by a factor of 6, could achieve a Vicker microhardness of HV0.21100. And the wear resistance in a block on ring test against YG8 was increased by a factor of 10. This is attributed to the presence of in situ synthesized ZrC particles and their well distribution in the coating.
Preparation of Ceramic Surface Hydrophobic Coating by Sol-Gel Method
Authors: Geng Sen , Zheng Zhan Shen , Hou Xiao Yu
Published: August 2013

In this article, using the sol method successfully prepared the stabe alumina collosol, and the gel film plated on ceramic substrate. After heat treatment, with micro/nanorough double structure of alumina was constructed, and then alumina was processed by using stearic acid cyclohexane solution, reducing the surface energy. The obtained surface has good hydrophobic property. By using X-ray diffraction (XRD), scanning electron microscopy (SEM) and contact angle measurement instrument on ceramic surface was characterized microstructure and wettability of the thin film.
Corrosion Failure Analysis of a Colored Steel Plate Used as the Workshop Roof
Authors: Shi Jun Bo , Guo Wei Min , Li Yong De , Xu Na , Wu Xiao Feng , Zang Qi Shan
Published: August 2013

By macro and micro morphology observations, chemical analysis, metallurgical observations, SEM observations and EDS analysis, the failure cause of a colored steel plate used as the workshop roof in a plant was analyzed; then, some improved measures were also proposed in this paper. It is demonstrated that failure of the colored plate is caused by the synergism of high temperature, and sulfur dioxide corrosion. The high concentration sulfur dioxide of the local area on the colored plate is the main failure cause.
Phase Difference Technique for Material Classification by Using Tuning Fork with Piezoelectric Resonator
Authors: Areejit Suwilai , Sooraksa Pitikhate , Aoyama Hisayuki
Published: August 2013

A tuning fork with piezoelectric (TFP) is an electro-mechanical device; its principle performance is based on specific frequency and limited voltage. As the principle, the device can result output significantly. This paper presents a material classification using phase difference value that is received from touching between material and modified TFP. For the modified TFP, it is customized by a millimeter needle. The frequency response method on Bode plot is used to observe the modified TFP behavior, and to select a specific frequency. The first-order model with cascade notch filters is employed to identify mathematical model of the TFP, and to verify the model by simulation. Experimentation is considered on 2 touching techniques: a shear-force type and a tapping mode type. There are hard plastic, iron, silicon rubber, vinyl eraser and hydrogel for test material. The results are described by both time series plots of input-output signals and numerical table of shifted phase. The technique can employed to classify the test materials effectively and explicitly.
Phase Composition Analysis of Recycled MgO-C Ladle Lining Materials
Authors: Zhang Jian , Bu Jing Long , Wang Li Ren , Wang Rong Lin
Published: August 2013

With the iron and steel metallurgy, cement, ceramic and other industries making a rapid development, the refractory consumption in our country is quite large. So how to recycle the used refractory materials effectively is more and more important. In this experiment, the phase composition of ladle lining bricks at slag line, rampart and bottom were researched systematically, to determine the phase composition change between the unused and recycled materials. It turned out that the low melting point minerals CaMgSiO4 and Ca3Mg (SiO4)2 formed due to the reaction between MgO and the impurity compositions like SiO2 and CaO from the melted slag and liquid steel. On the one hand, the formation of these low melting point minerals was one of the main reason for the damage of the recycled MgO-C ladle lining bricks. On the other hand, the alkaline magnesium carbon bricks had purification effect for the liquid steel as a result of the content reduction of SiO2 and CaO.
Effect of Thermal Treatment on the Physical Properties of Electrospun PVDF/PMMA Composite Membrane
Authors: Zhao Jian Meng , Liang Yin Zheng , Cheng Si Chen , Qiu Yi Ping
Published: August 2013

Poly (vinylidene fluoride) (PVDF) / poly(methyl methacrylate) (PMMA) composite membrane was produced by the electrospinning technique. Thermal treatment was introduced to improve the mechanical property and dimensional stability. In this paper, the PVDF/PMMA membranes before and after thermal treatment were characterized by Scanning electron microscope (SEM), differential scanning calorimeter (DSC) , pore size and porosity test, electrolyte uptake test and tensile test. The pore size, porosity, electrolyte uptake rate, tensile property, as well as melting temperature and crystallinity changed with the treated temperature. The results show that thermal treatment could notably increase the tensile property of electrospun PVDF/PMMA composite membrane and 160°C is a proper temperature for thermal treating.
The Study on the Dynamic Response Performance of PEMFC Stack with Electrodeposited Pt/C-RuO2·xH2O Electrode
Authors: Fu Li Bin , Lu Lu , Xu Hong Feng , Zhao Hong , Ren Rui Ming
Published: August 2013

Dynamic response performance of PEMFC affects its durability and reliability significantly. So improving on dynamic performance of PEMFC has become the key for prolonging PEMFC life in fuel cell vehicles application. In this study, in order to promote the PEMFC dynamic response performance, RuO2·xH2O was prepared by solgel method and then sprayed onto catalyst layers. The RuO2·xH2O prepared was characterized by TEM, which shows the average particle size of RuO2·xH2O was 8 nm and particulates were well distributed. A 10-cell stack using MEAs with and without RuO2·xH2O was assembled and studied under different relative humidity. It was found that added with RuO2·xH2O dramatically improves the dynamic response performance, which revealing that RuO2·xH2O can buffer the voltage undershoot and improve the stability and lifetime of PEMFC stack.
Development of the Woolen 48Nm Cashmere Yarn
Authors: Huang Li Xin
Published: August 2013

High-count cashmere is the inevitable requirement of the high-end yarn cashmere products.To the short of the high-count cashmere yarn production and the difficult of spinning,From raw material selection, technological process, equipment transformation, parameter optimization, temperature and humidity control and other aspects,we analysised the high-ount cashmere yarn production process and quality control system,The development of the woolen 48Nm cashmere yarn has been done,it is of first class.
Antimicrobial Treatment of Bamboo Blending with Cotton Carpets Using Modified Chitosan
Authors: He Liang Zhen , Shao Gai Qin , Wang Sheng , Chen Zhi Hua
Published: August 2013

Carpets made with different blending ratio of bamboo and cotton fibers were treated with modified chitosan by padding process. The best performance of the carpets treated was obtained when the carpets were padding with 70 g /L modified chitosan solution under the roller pressure of 0.14 MPa, and cured at 160°C for 90 min. The antibacterial effect of the carpets treated with modified chitosan was characterized by the inhibition ratio to staphylococcus aureus, escherichia coli and Candida albicans and the lustrating ratio of mite. The treated carpets all showed broad-spectrum antimicrobial activity against gram-positive and gram-negative bacteria and fungi tested and modified chitosan is effective on anti mite.
Development of Bamboo Charcoal Fiber Blended Anti-Ultraviolet Fabric
Authors: Yao Gui Fen
Published: August 2013

In order to protect the human body, developing ultraviolet protection fabric to avoid excessive ultraviolet radiation. The main factors influencing the solar ultraviolet radiation protective properties of anti-ultraviolet fabric are: the type of fiber, yarn properties, fabric structure parameters and fabric color, etc. In order to development anti-ultraviolet protective fabric, we change three parameters of fabric that is the color of textile fabrics, warp density and fabric structure. The yarn selected in the experiment is blended yarn of bamboo charcoal fiber/silk/tencel 30/30/40, and the color of the yarn is gray or black. The sodium copper chlorophyll of bamboo fiber is safety, excellent ultraviolet absorbent; the fabric warp density is designed for 240/10cm, 260/10cm, 280/10cm; fabric structure is designed for three kinds of weave, which is plain weave, compound twill and reinforced satin. Using YG(B)912E tester test the ultraviolet protection performance of the designed fabric specimen, recording its T(UVA) , T(UVB) and UPF. By the repeated orthogonal experiment method, determine which factor is significant to the performance of fabric with ultraviolet protection, and determine the optimal design scheme.
A Facile Non-Aqueous Approach for the Synthesis of Cu Nanowires
Authors: Jin Jia Rui , Chen Yuan Zhi , Guo Hui Zhang , Wang Zhen Wei , Peng Dong Liang
Published: August 2013

A non-aqueous synthetic route has been developed for the preparation of uniform Cu nanowires with length up to tens of micrometers. Unlike commonly used one-pot synthesis approach that usually involve a fast reduction of metal precursors in the presence of reducing agents, a continuous-injection approach has been to utilized to control the speed of reaction and the concentration of Cu nuclei. In this approach, copper (II) chloride dihydrate and nickel (II) acetylacetone which are dissolved in oleylamine solutions have been injected into octadecene by a syringe-pump. The as-prepared samples have been characterized by transmission electron microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results show that the products are pure Cu nanowires which have preferred <110> growth directions. The formation mechanism and major influencing factors on the synthesis of Cu nanowires have been discussed.
Synthesis of ZnO Nanorod Arrays on Chaleted Sol-Gel-Derived ZnO Thin Films and its Optical Absorption in Visible-Light Region
Authors: Yang Li Rong , Wei Jun Cong , Zhang Li , Chen Hai Bin
Published: August 2013

Well-aligned ZnO nanorod arrays on Chaleted Sol-Gel-Derived ZnO thin films was achieved at a temperature of 90°C by a surfactant-assisted soft chemical approach. The nanorod arrays were characterized by XRD, SEM, XPS, and UV-Vis absorbance spectra. The ZnO nanorod arrays are wurtzite crystal stuctures preferentially orienting in the direction of the c-axis and ZnO nanorods are grown verticallyon the substrate. The XPS analysis shows the Zn:O ratio of ZnO nanorod arrays near is 1:1. The UV-Vis absorbance spectra indicate that ZnO nanorod arrays have absorption of visible-light as well as ultraviolet-light. Therefore, the ZnO nanorods may be good candidates for visible-light photocatalysis materials from the viewpoint of practical applications.
Study on Needle and Needleless Electrospinning for Nanofibers
Authors: Liu Wan Jun , Zhang Hai Feng , Li Da Wei , Huang Chen , Jin Xiang Yu
Published: August 2013

Polyvinyl alcohol (PVA) water solution was electrospun by both needle electrospinning and needleless electrospinning. The electrodes for needless electrospinning were rotary spiral disk and spiral coil made from stainless steel. We found that needleless electrospinning can obtain nanofibers in large-scale, while fiber diameter and diameter distribution were larger when compared to the conventional needle electrospinning. The average diameters of disk electrospun and coil electrospun nanofibers were 441±99nm and 415±103nm respectively. As for needle electrospun nanofibers, the diameters were 393±29nm and 349±25nm when the applied voltage were 10kV and 15kV respectively.
Effects of Reaction Conditions on Microstructures and Properties of Polyaniline Nanofibers through Interfacial Polymerization
Authors: Tian Fei , Qin Zong Yi , Wu Qian , Liu Na , Lu Ya Qing
Published: August 2013

Polyaniline (PANI) nanofibers were fabricated through chemical oxidative polymerization at various organic solvent/water interfaces. The products were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). It is found that the morphologies, microstructures and properties of PANI nanofibers depend not only on the nature of organic solvents but also the adding way of aniline monomers and oxidant.
Synthesis of Vanadium-Doped TiO2 Hollow Spheres and their Visible Light Photocatalytic Activity
Authors: Lin Xiao Xia , Fu De Gang , Ye Yuan Feng , Hao Ling Yun
Published: August 2013

Vanadium-doped TiO2 hollow spheres (V-THs) were successfully synthesized by hydrothermally process using carbon spheres as templates. The physicochemical properties of the catalysts were characterized by XRD, TEM, UV-Vis diffuse reflectance spectra, N2 adsorption-desorption isotherms. The photocatalytic activities of the prepared samples were evaluated for the degradation of 4-chlorophenol (4-CP) aqueous solution under visible light (λ>400 nm) irradiation, and was compared to undoped TiO2 hollow spheres (THs). It was found that vanadium ions doping sample showed the highest photocatalytic activity with an optimal doping concentration of 1.5% under visible light irradiation.
Technical Study on Microwave Method for the Preparation of Flower-Like ZnO
Authors: Liu Dong
Published: August 2013

Flower-like ZnO was prepared by using ZnCl2 and NH3·H2O as starting materials employing a simple microwave synthesis method. The result shows that flower-like ZnO microcrystal is obtained with 15mL NH3·H2O dropped into ZnCl2 solution and microwave power of 240W for 20 mins simultaneously. Microstructure and surface morphology were investigated in detail by XRD, SEM. The XRD pattern shows, as-prepared ZnO particles are highly crystallized with a wurtzite structure, SEM result demonstrates that flower structure is closely composed of petaloid unit and consists of a series of the bottom thick and top thin nanorods. By researching on PL properties of ZnO, PL spectra shows it has three emission peaks. Then approximate analysis of the causes of every emission peak was made. A simple analysis of growth mechanism was also made in theory finally.
Fabrication of Micro-Structural ZnO Crystal and the Concentration Fields of the CVD Reactor
Authors: Xu Jun Bo , Tian Hui Juan , Tian Ya Jun , Wen Hao
Published: August 2013

Arrayed ZnO crystals were fabricated with Zn as raw material by thermal chemical vapor deposition in a tubular reactor. The characterizations indicate the product grown at upstream is the well-arrayed ZnO submicro-column with good crystal properties, that at downstream is well-arrayed nanoneedle with more defects. In combination of mass field analysis with Fluent, it is revealed that the concentration fields at the upstream and downstream positions of Zn source are not identical even in an identical temperature field. It is the diffusion that drives Zn vapor move to upstream position where the O2 is rich, and the amount diffuse to upstream is rare due to the transportation of working gas. Most of O2 is consumed when passes the Zn source, leading to more lean O2 but rich Zn at the downstream position of Zn source. Our results support that lower concentration of Zn and O2 is in favor of the formation of perfect crystal as happened at upstream, but in such condition that more Zn and rare O2, defects of O vacancy is liable to form during ZnO growth.
Study on Bainitic Microstructure under Low Austempering Temperature and its Wear Resistance of Low-Alloy High-Carbon Steel
Authors: Yang Jing , Wang Zhi Bin , Zhang Hai Liang , Liang Xiao Long
Published: August 2013

A new low-alloy high-carbon steel was designed to obtain the carbide-free bainite under low-temperature austempering. The microstructure, wear resistance under dry sliding friction and the wear mechanism were comparatively studied between samples austempered and low-temperature tempered. Results show that the carbide-free bainitic microstructure composed of bainitic ferrite laths with mean thickness of 120 nm and retained austenite films can be achieved by austempering at 220 °C for 120 h in salt bath after austenitizing at 1000 °C. The wear resistance under dry sliding friction of austempered sample is 19% more than that of low-temperature tempered sample. The wear mechanism of the low-temperature austempered sample is determined as the adhesive wear.
Physical Simulation of Inclusions Removal in 180t RH Degasser
Authors: Yang Chun Jie , Tang Fu Ping , He Tao , Fu Qiang
Published: August 2013

As one of the important refining equipments between steelmaking and continuous casting, RH vacuum refining plays an important role in removing the inclusions in the molten steel.RH can improve steel quality largely and meet the demand of mass production of high additional value. On the base of the similarity principle, a water model was developed to study the influence factors of inclusion removal in the molten steel of 180 tons RH vacuum refining device.Liquid steel is simulated by Nacl solution, the air is approximate argon, polypropylene simulate inclusions and NaHCO3 simulate composite particles. The influence regularity of lift gas flow rate, submersion depth of snorkels and the input amount of NaHCO3 on the inclusions removal rate have been discussed and the optimal values for each influence factor have been found.
Effect of Temperature on Tribological Performances of Ion Nitrocarburized Layer of 42MnCr52 Steel
Authors: Hu C.H. , Qi Feng Jun , Lu Meng Liang , Wang Guo Ning , Liu Qian , Sun Xiao Feng
Published: August 2013

The paper studied that effect of temperature on tribological performances of ion nitrocarburized layer of 42MnCr52 steel under CD15W-40 oil lubricating. It is found that the ion nitrocarburized layer has more excellent friction reduction and wear resistance performances than the plain surface under different temperatures, especially under the higher temperature 150°C, the friction factor and wear scar width of ion nitrocarburized layer is 36% and 77% less than that of the plain surface respectively, which indicates that ion nitrocarburized layer can play more excellent friction reduction, wear resistance and scuffing resistance performances under the relative higher temperature.
Study on Continuous Cooling Static Transformation Regularity of T700
Authors: Song Zhuo Fei , Feng Yun Li , Feng Run Ming , Yin Shao Jiang
Published: August 2013

Continuous cooling static transformation regularity of T700 was investigated by gleeble-3500, the results show when the cooling rate is small organization is mainly composed of ferrite and pearlite. With the increase of cooling rate, begin to appear granular bainite. When the cooling rate is 10-20 °C /s, microstructure is acicular ferrite and bainite. Along with the cooling speed further increasing, martensite begins to appear in organize, and with the increase of cooling rate, martensite content gradually increase.
Research on Continuous Cooling Dynamic Transformation of T700
Authors: Song Zhuo Fei , Feng Yun Li , Feng Run Ming , Yin Shao Jiang
Published: August 2013

Continuous cooling dynamic transformation regularity of T700 was investigated by gleeble-3500. The results show when the cooling rate is small organization is mainly composed of polygonal ferrite and pearlite and has minor banded organization. With the increase of cooling rate, begin to appear granular bainite. When cooling rate reaches 3/s or more, ferrite changes to quasi polygon, and start to appear small amount of bainite. when the cooling rate is 7°C/s, pearlite is disappeared in structure, granular bainite increases, quasipolygonal ferrite content is gradually decreased. When the cooling rate is increased to 10°C/s or above, organization is granular bainite.
The Influence of Hot Rolling Process on the Performance of HG70C
Authors: Peng Qi Chun , Peng Sheng , Fan Dan Ping , Chen Kai , Li Ju Zhong , Li Wei
Published: August 2013

Through the metallographic and electron microscopic analysis on the tensile specimens of low-alloy-high-strength-welding HG70C, we can see that the hot rolling process has an effect on mechanical properties of HG70C: the longer the heating time is, the stronger the yield strength and tensile strength will be. The thicker the finishing slabs are,the stronger the yield strength and tensile strength will be. But it has little effect on the elongation rate. The longer the heating time is, the more even these organizations will be. The decrease of rolling pressure will reduce the aggregation of the inclusion and the formation of banded structure which is conducive to improving the yield strength and tensile strength of HG70C. And martensite is a product of high temperature. There is certain relationship between the formation of banded structure and the formation of martensite.
Martensite Phase Transform during Nitrogen-Spray Water Jet Quenching
Authors: Wang Li Feng , Shao Bao Dong , Cheng He Ming , Tian Chong
Published: August 2013

Nitrogen-spray water jet quenching is a new kind of quenching, whose cooling velocity can be controlled. Thus different phase can be achieved according requirement, which can improve the characteristic of material. 9SiCr alloy steel was tested during Nitrogen-spray water jet quenching. The continuous cooling curves of 9SiCr under mixture of Nitrogen-spray water quenching for different pressure and mixture ratio of Nitrogen and spray water are obtained. After quenching, the metallographic structures were investigated, in which the uniform martensite was obtained after quenching.
The Effect of Precipitate Agent in Co-Precipitation Synthesis Y3Al5O12 and Y3Fe5O12 Powders
Authors: Zeng Min , Wang Yun Hong
Published: August 2013

The YAG and YIG powders have been prepared by co-precipitation technique in which NH4HCO3 or (NH4)2CO3 is used as a precipitant and Y(NO3)3·6H2O, Al (NO3)3·9H2O and Fe (NO3)3·9H2O as raw materials. The composition, the phase formation process and the properties of the YAG and YIG powders were investigated by means of XRD, SEM, TEM and EDS. The results indicated that the precipitant effects the preparation of pure-phase powders. The resultant YAG and YIG powders showed good dispersity and excellent sinterability using AHC as precipitant.
Preparation of Ultrafine Zirconia Suspension Using Glutin-Urea Gelcasting System
Authors: Wang Jin Feng , Du Jiao , Zhu Xiu Dong
Published: August 2013

Glutin-urea system was used to prepare ultrafine zirconia suspension for gelcasting. Premixed solution was prepared at deionized water/glutin/urea ratio of 90/10/5 (by weight). Adjusting pH value to11, zirconia powders and A-type dispersant (polyacrylic salt) were added. After ball-milled about 12 hours, 45vol% zirconia slurry was acquired and the viscosity of which was less than 1 PaS.
Fracture Mechanics Analysis of GI All-Ceramic Crowns
Authors: Fan Cheng
Published: August 2013

Dental ceramic materials have approximate color and translucency with natural tooth, which is unmatched by other restorative materials. Because of its beautiful appearance, good physical and chemical properties, all-ceramic crown restorations are more widely used., However, due to the brittleness of ceramics and the stress mismatch between different materials, dropping or fracture phenomenon of porcelain veneer is often occurred in clinical application during the service period of all-ceramic crowns. The porcelain veneer failure mechanism is still not very clear, in this paper, the force performance of all-ceramic crowns is analyzed using the RFPA (realistic failure process analysis) system. The crack initiation, propagation and failure process of all-ceramic crown can be clearly observed and the research results provide guidance for clinical application
Changes of the Glass Structure in the Phase Splitting Process of Na2O-CaO-Al2O3-B2O3-SiO2-TiO2 System
Authors: Gao Sui Jing , Zhang Wen Li , Hou Gui Qin , Zhu Xiu Dong
Published: August 2013

This paper studied the change of glass phase splitting structure in Na2O-CaO- Al2O3-B2O3 -SiO2-TiO2 system. It discussed the change of two-phase composition and central ion coordination number of the phase splitting glass in the phase splitting process by using the means of EDS, SEM. The result indicates that the glass structure of two-phase changes significantly in the phase splitting process of this system. When the temperature is low, the glass net work is composed of [BO4], small quantity of [BO3] and large quantity of [AlO4] in the structure of alkali boron-rich phase, and the net adjustment ion is Ca2+ mainly; and then the glass net work is composed of [SiO4] and small quantity of [AlO4] in silicon-rich phase, and there are large quantity of net adjustment ion Na+ in the structure also. With the phase splitting temperature rising, the distribution of the net work central ion in two-phase retains unchanged, small quantity of the coodination number of Al3+ rising, [BO3] transfers to [BO4] gradually, at the same time, the net adjustment ion Na+ enters in alkali boron-rich phase, that is Na+ transfers to alkali boron-rich phase from silicon-rich phase. Along with the proceeding of phase splitting process, TiO2 concentrate and pricipitate at two-phase interface.