bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation on the Spectroscopic Properties of Yb3+-doped Phosphate Glass
Authors: Sang Qi , Wang Shao Jun , Wang Xue Rong , Lu Jing Wen
Published: September 2011

A series of the Yb3+ -doped phosphate laser glass have been prepared under high temperature and different doping content and the fluorescence and absorption spectrum is observed, respectively. The influences of the Yb3+ -doped content on the spectral properties of the glass are analyzed and the optimal mole fraction is 4 %. The emission cross-section and fluorescent lifetime is calculated with McCumber theory. Furthermore, the integrated absorption cross-section, the full width at half maximum of the emission spectra and the laser performance parameters such as least particle count, saturation pump intensity and lowest pump intensity of Yb3+ -doped laser glass is calculated.
Significant Enhancement of Triterpenoids Production by Phomopsis Elicitors in Cell Suspension Cultures of Betula Platyphylla Suk.
Authors: Zhai Qiao Li , Zhan Ya Guang , Xu Dao Qi , Wang Xiao Dong , Fan Gui Zhi
Published: September 2011

58 fungal elicitors prepared from the endophytic fungi isolated from inner bark of B. platyphylla Suk. were examined to determine their effects on the growth and triterpenoid production in suspension cultures of Betula platyphylla Suk. cells. The results showed that different fungal elicitors could cause diversely stimulating effects. Among the fungal elicitors tested, BE58 stimulated the highest triterpenoids yield with 15.90 mg•L-1 and 183.72% higher than the control. The experiment also affirmed from mRNA level that triterpenoid was indeed accumulated in suspension culture of birch cells treated by BE58 fungal elicitor. Meantime BE58 was identified as Phomopsis from the morphological and molecular level.
Photophysical Property Investigation of Nanometer Porphyrin Oligomer
Authors: Shi Ying Yan
Published: September 2011

In this paper, ω-bromopropylporphyrin ether was firstly synthesized using 1,3-dibromopropane as bridge-linked group and 5-(4-hydroxyphenyl)-10,15,20-triphenylporphyrin (H2MHTPP) as the matrix. The resulting compound was then reacted with 5,15-di(4- hydroxyphenyl)-10,20-diphenyl porphyrin (trans-H2DHDPP) to give a new title nanometer porphyrin oligomer. Characterization were made by the methods of elemental analysis, UV-vis, IR, 1H NMR and XRD. Has studied the crystalline ,the fluorescence property and the heat-stable property of porphyrin monomer and porphyrin oligomer. The research discovered that the crystalline,the fluorescence property and the heat-stable property can have the very big change along with the porphyrin peripheral substitution groups as well as the oligomer formation. And the function of difference kinds of solvent and the porphyrin molecular structure symmetry also can have the very tremendous influence to the crystalline,the fluorescence property and the heat-stable property.
Testing of Precast Lightweight Foamed Concrete Sandwich Panel with Single and Double Symmetrical Shear Truss Connectors under Eccentric Loading
Authors: Mohamad Noridah , Muhammad Hilmi Mahdi
Published: September 2011

This paper reports the structural behavior of precast lightweight foamed concrete sandwich panel, PLFP, subjected to eccentric loading. An experiment was conducted to investigate the structural performance of PLFP under this load. Two PLFP panels, PE-1 and PE-2 were cast with 2000 mm in heights, 750 mm in width and 100 mm in thickness. The thickness of the wall is actually a combination of three layers. Skin layers were cast from lightweight foamed concrete while the core layer is made of polystyrene. The skin layers were connected to each other by 9 mm steel shear truss connector which were embedded through the layers. Panel PE-1 was strengthened with single diagonal shear truss connectors made of 6 mm steel rebar while panel PE-2 was strengthened with symmetrical diagonal shear truss connectors of similar steel diameter. Both panels were tested under eccentric load till failure. The results showed that panel with symmetrical double truss connectors, PE-2, is able to sustain higher load compared to panel with single shear truss connector. The load-deflection profiles indicate that both panels achieved certain degree of composite action especially during the later stage of loading where the wythes tend to move in the same direction until they reached failure. The load-strain curves for both panels highlight the inconsistent distribution of surface strain along the height of panels. The overall trend of the strain curves show that they are under compression.
Experimental Research on Pore Structure of RCA and its Impact on Drying Shrinkage
Authors: He Yun Xiang
Published: September 2011

Pore structure is one of the main influencing factors of materials drying shrinkage. C30 natural mix proportion is used as reference, the impact of replacement rate of recycled aggregate, the mixing amount of fly ash, water reducer, expansion agent and water-cement ratio on recycled aggregate concrete’s porosity and pore characteristics was studied. Based on the pore structure theory, the influence of porosity and pore characteristics on recycled aggregate concrete’s drying shrinkage is analyzed.
Research on Environment-Friendly Soil Stabilizer Solidifying Buildings Residues for Paving Materials
Authors: Li Qin , Sun Ke Wei
Published: September 2011

Two groups of buildings residues was studied in the paper as to unconfined compressive strength, soaked unconfined compressive strength, shrinkage values, porosity. It is show that Q2 soil stabilizer can improve the micro-structure of solidified blocks of buildings sediment for dispersed sphere-shaped particles can be generated by Q2 soil stabilizer mixed with buildings residues and cement. As a result, the solidified block of buildings sediments was improved in the properties in its increased unconfined compressive strength, decreased shrinkage values and higher durability.
Configuration of Low-Strength Self-Compacting Concrete Adapted to Local Raw Materials
Authors: Li Jie
Published: September 2011

C25 self-compacting concrete which meets the requirement of workability and strength grade is maked up by selecting local raw materials, using reasonable compound admixtures, based on c25 self-compacting concrete preliminary mixing proportion. we try to pursue an economical mixing ratio of the Low-strength Self-compacting Concrete which can adapt to the characteristics of the region's raw materials. The purpose is to promote the application of self-compacting concrete in region.
Interfacial Combination and Mechanical Properties of BC/PVA Multilayer Composite Hydrogels
Authors: Tan Jue , Zheng Yu Dong , Tian Ru , Zhang Shi Bo , Chen Hong Yan
Published: September 2011

Bacterial cellulose (BC)/Poly vinyl alcohol (PVA) multilayer composite hydrogels were prepared by freezing and thawing. The mechanical properties of the composite were investigated in this paper with different mass percent of PVA, number of BC layers. Scanning electron microscope (SEM) was used to characterize the fracture characterizations of the composite and the interface structure between BC membrane and PVA hydrogel. It was found that composite hydrogels with 15wt% PVA and 2 layers BC membranes exhibit excellent mechanical properties and wonderful bonding effect of the interface.
Effect of Aggregate Pre-Wetting and Air-Entraining Agent on Durability of Lightweight Aggregate Concrete
Authors: Zhao Wei Xia , Liu Juan Hong , Yang Ping , Yuan Xiao Ning , Chen Min
Published: September 2011

Rapid carbonation test and gas permeability radio method are used to study the durability of lightweight aggregate concrete. The concrete includes foam,lightweight aggregate，pre-wetting and air entraining. The test results show that The combined-effect of air entraining agent(AEA)and aggregate pre-wetting can increase permeability. The anti-carbonation capacity of pre-wetting and air entraining lightweight aggregate concrete is 40% greater than that of ordinary concrete.gas permeability radio of pre-wetting and air entraining lightweight aggregate concrete is half of that foam concrete and expanded pearlite concrete.
Influence of Mineral Admixtures on Chloride Threshold Value for the Corrosion of Steel Reinforcement
Authors: Li Peng Ping , Xiong Jian Bo , Fan Zhi Hong , Wang Sheng Nian
Published: September 2011

The influence of mineral admixtures on chloride threshold value was investigated by EIS method, MIP test and TG test, respectively. The experimental results showed that the chloride threshold value decreased with increasing the fly ash and slag content in composite cementitious. The increasing of fly ash and slag replacement resulted in the decreasing of porosity, average pore size and Ca(OH)2content. The effect of mineral admixtures on the chloride threshold value was the comprehensive results of concrete pore structure and Ca(OH)2content. The chloride threshold value decreased with decreasing the Ca(OH)2content in concrete, and there was an approximate linear relationship between the logarithm of chloride threshold value and the logarithm of CCa(OH)2content when the specimens exposed in tidal zone. The specimen exposed in tidal zone has a higher chloride threshold value than that exposed in splash zone was due to the lower dissolved oxygen around steels in concrete.
A Novel Approach of Chitosan Additive to Remove Formaldehyde from Building Materials
Authors: Wang Huang Chin , Kang Sy Yuan , Tseng Chao Heng , Shau Wen Cheng , Chen Zhi Yang
Published: September 2011

Formaldehyde (HCHO) which emitted from building materials, such as plywood and adhesive, is a carcinogenic substance in indoor air. Chitosan is produced from the structural element in the exoskeleton of crustaceans (such as crabs and shrimp), and has the ability to absorb HCHO. In this study, the HCHO removal efficiency by chitosan additives was evaluated for two building materials - adhesive and plywood. The experiments were performed in a small chamber based on the method of Japanese Industrial Standards (JIS) A1901 to evaluate the HCHO emission from adhesive and plywood before and after the application of chitosan additives. Both the HCHO concentration in the chamber and the HCHO emission factor of two adhesives, urea-formaldehyde (UF) resin and Poly Vinyl Acetate (PVAC) resin, were reduced from 0.02~0.21 ppm and 0.12~1.05 mg/m2h to 0~0.14 ppm and 0.12~0.63 mg/m2h after using chitosan additives. The best HCHO removal efficiency was adding 9% chitosan additives in the adhesives. The amount of absorbed HCHO is proportional to the amount of chitosan additives, and approximate 0.02 mg of HCHO can be absorbed by per mg of chitosan additive (i.e. absorption capacity 0.02 g HCHO/g Chitosan).
Research on Impact Damage of Polypropylene Fiber Mortar Based on Axial Compressive Strength
Authors: Chen Yu Zhi , Xuan Wei Hong , Chen Xiao Hong
Published: September 2011

The method recommended by ACI Committee 544 was used in this paper. Drop hammer impact tests based on mortar specimens with different contents of polypropylene fiber were carried out. The compressive strength test is done before and after impacting. Under different drop hammer impact time, polypropylene fiber mortar specimens’ damage degree was evaluate based on compressive strength. The results show that the hammering number corresponding to the impact fracture of polypropylene fiber mortar is more than ordinary mortar that without fiber. The axial compressive strength of all specimens decreased gradually during the process of hammering, but adding the right amount of polypropylene fibers can effectively slow down the rate of strength reduction.
The Effect of Fly Ash on Water Transport of Concrete in Dry State
Authors: Zhang Xiong Wen , Jiang Lei , Liu Guan Guo
Published: September 2011

Water transport is an important parameter that affects the long term performance and degradation of concrete greatly. Nowadays, adding fly ash is a promising solution to achieve high-performance, low-price and environment-friendly concrete. To characterize the effect of fly ash on water transport of concrete, especially in dry state, moisture variations and microstructure of concrete with different mix proportions were studied in this paper. Test results reveal that fly ash will increase the porosity of early curing concrete, the higher porosity leads to a faster evaporation, which accelerates the transport of water in cement based materials.
About on Low-Alloy Coupled Steel Bars Concretes Rigidity and Crack Opening Model Formula Establishment
Authors: Gao Bing
Published: September 2011

Coupled steel bars have already more than 30 year historical development. But, it was made by HPB235, Plasticity and ductility were very poor, so, only use in planking component. Now, we made coupled steel bars by Low-alloy steels. According to tentative data, model building formula that’s rigidity and crack Opening. Provide the basis for the project construction.
Experimental Research on Isothermal Sorption of RAC Material
Authors: Guo Yuan Chen , Wang Xue
Published: September 2011

Material adsorption process is the reverse process of evaporation diffusion, reflecting directly the wetting degree of material, is one of the main factors of material drying shrinkage. Based on pore structure theory, this article designed a device measuring the wetting properties of materials, tested different recycled aggregate replacement rate recycled aggregate concrete isothermal absorption curve. The article proposes the water contact angle can be calculated from the initial absorption curve, and analyzes its impact on drying shrinkage of recycled aggregate concrete.
Effect of Emulsified Asphalt on Temperature Susceptibility of Cement Asphalt Mortar
Authors: Zhang Yun Hua , Wang Fa Zhou
Published: September 2011

Cement asphalt mortar (CA mortar, or CAM) is a composite material with equal presence of cement and asphalt emulsion and acts as a cushion layer in the structure of slab track. In the hardened matrix, asphalt accounts for about 30 vol. %, rendering the properties of CA mortar susceptible to temperature variation. In the paper, different kinds of emulsified asphalts (A70 emulsified asphalt, A90 emulsified asphalt, SBS modified emulsified asphalt and SBR modified emulsified asphalt) for CA mortar and the compressive strengths of CA mortar under different temperatures (-18°C, 10°C, 25°C, 40°C and 60°C) were studied to reflect its thermal dependence. Results indicate that temperature susceptibility of CA mortar prepared with modified emulsified asphalt is better than which prepared with unmodified emulsified asphalt. SBS modified emulsified asphalt -CAM (viz. CA mortar prepared by SBS modified emulsified asphalt) is alleviated at the whole temperature range, while that of SBR modified emulsified asphalt -CAM is improved primarily at the lower temperature region. As for types of unmodified asphalts, A90 emulsified asphalt -CAM outperforms A70 emulsified asphalt -CAM at lower temperature range.
Constructing a Syntheses Table of the Standard Amino Acid Based on the PAM250 Matrix
Authors: Shi Xiao Hong , Wang Xiang Hong
Published: September 2011

It is well known that there are some similarities among various naturally occurring amino acids. The standard amino acids have been grouped by their general properties and the chemical structures of their side chains. In this paper we divided the molecular weight of amino acid into two parts: backbone molecular weight Mband side chain molecular weight Ms. We naturally grouped the amino acids into two sets according to the rate of Ms/ Mb. We developed a method to construct a syntheses table to reflect the relevant physicochemical properties based on the PAM250 matrix and successfully established an elegant table of the twenty amino acids. Our work proved that PAM250 matrix could be used not only in finding reasonable alignments but also in grouping similar amino acid.
Studied Catalysis of CuO Nanocrystal on KClO4 Decomposition
Authors: Ba Shu Hong , Sun Zhen Xing , Zhang Zhe , Zhang Chun Hong
Published: September 2011

CuO nanocrystal has been successfully synthesized by adopting liquid phase reaction and using cupric nitrate and sodium hydroxide as raw materials. The prepared products are characterized by XRD, FT-IR and TEM. The catalysis of CuO Nanocrystal on KClO4 is investigated by thermal analysis. The results show that CuO nanocrystal is consisted of the mixture of spherical nanoparticles with an average sizes of 11nm. The catalysis of CuO nanocrystal on KClO4 thermal decomposition was strong. And it makes thermal decomposition temperature of KClO4 to decrease 97.7 °C, the decalescence amount also reduced to 79.07 J/g. But the addition of CuO nanocrystal has no effect on the crystal shape transformation of KClO4.
Isothermal and Non-Isothermal Crystallization Behavior of Poly(L-Lactic Acid) with Nucleating Agents
Authors: Qian Xin , Zhou Mi , Xu Dong , Xu Shu Jun , Jin Yang Fu
Published: September 2011

The effects of Amide type nucleating agents SX , talc and nucleating agents SX combination with talc on crystallization behavior of poly (L-lactic acid）(PLLA) were analyzed by means of Differential scanning calorimetry (DSC)．The results of non-isothermal crystallization showed that SX is an efficient nucleating agent. The crystallization peak temperature and degree of crystallization of PLLA sample with 0.6 wt% SX are both higher than that of PLLA sample with 4 wt% Talc，which proved that the nucleating ability of SX is stronger．Nucleating agent SX and talc combination has obvious coordination effects, the sample of PLLA/0.2 wt % SX + 4 wt % talc has the minimal crystallization undercooling temperature, the highest crystallization peak temperature and crystallinity. Isothermal crystallization kinetics of PLA showed that when the four nucleating agents added in are all with the Avrami exponent n between 2.1-2.5, crystallization tended to be heterogeneous nucleation. When the nucleating agents added in are 0.6 wt%, the crystallization time is greatly decreased to 0.75min. Meanwhile, the PLLA crystallinity could be significantly increased by adding SX nucleating agents; besides, with the decrease of the isothermal crystallization temperature, the half crystallization time of the PLLA/0.6 wt% SX sample was decreased.
Sp2 Hybridization Effects on Friction of Diamond-Like Carbon Film (110) Surfaces Studied by First Principles Molecular Dynamics
Authors: Wang Li Li , Wan Qiang , Tang Yong Jian , Wang Chao Yang
Published: September 2011

The influence of sp2hybridization on friction and structure of diamond-like carbon (DLC) films was studied by first-principles molecular dynamics. First-principles calculations have been performed using the pseudo-potential plane wave method. Our results show that: 1) The buffer role of sp2-hybridized state carbon between grain boundaries greatly affected the residual stress of DLC film, and hence the friction decreased steadily with the increased in sp2hybridization content. 2) For thinner films, there was very greatly differences in stress between diamond-like carbon film (110) surfaces in <001> and<1-10> directions. The difference in friction force between soft and hard directions was nonexistent, when the sp2-hybridized state carbon atoms increased to 80%, perhaps because the originally hard C-C and C-H bonds changed, and steadily reject interaction was drive break.
Experimental Study of Magnetorheological Elastomer Vibration Isolator
Authors: Zhu Shi Sha , Qu Li Juan , Zhou You Hang
Published: September 2011

The magnetorheological elastomer has a broader potential application due to overcoming the settlement, poor stability, sealing problems and other shortcomings of magnetorheological fluid easily. Firstly the magnetorheological elastomer is prepared, and then it is experimentally proved that the magnetic effect of magneto-rheological elastomers is occurred under magnet field and the stiffness can be also adjusted by controlling the density of field through performance experiments. In this paper, a squeeze mode magnetorheological elastomer vibration isolator and a test rig are designed, it has been shown that the natural frequency of vibration isolator is changed, and the effect of vibration isolation is preferable from the amplitude-frequency characteristic curves for vibration control experiments.
Deinking Technology and Deinking Agent of Waste Paper
Authors: Ma Yong Sheng , Wang Lin Tong , Sun Xian Hui
Published: September 2011

Recycling of waste paper is one of pop topics of pulping and papermaking industry. Deinking technology is the key of recycling of waste paper. It is briefly introduced that methods of waste paper deinking and mechanism of deinking and constitute of deinking agent.
Design and Optimization of Injector Structure in Diesel Engine Based on ISIGHT Platform DOE Methods
Authors: Wu Xin Ying , Ouyang Guang Yao , Li Yu Xue
Published: September 2011

The traditional design method of injector structure cannot meet the demand of farther improved performance,the change of modern environment demand not only the optimization of one performance but also the optimization of various comprehensive performance.iSIGHT is a multidisciplinary design optimization platform that offer a integrated designenvironment and advanced design optimization methods. The optimization design of injector structure based on design of experiment of iSIGHT platform to improve the spray quality of injector is implemented.
Water Barrier Property of Gelatin-Based Films Cross-Linked with Microbial Transglutaminase
Authors: Zhu De Yi , Jin Li Qiang , Wang Yu Lu , Ren Hai Xia
Published: September 2011

In this paper, gelatin-based films were prepared by mixing gelatin with glycerol, and microbial transglutaminase (mTG) which was used as cross linking agent. The result of SEM confirmed that a dense network structure was formed after mTG treatment comparing to the native. The effect of mTG on water barrier property of films was investigated by measuring the water vapor permeability (WVP). The results showed that the concentration of gelatin has a significant influence on the water barrier property of gelatin-based film which was treated with mTG. The WVP value of the films decreased sharply after enzymatic cross-linking when gelatin concentration increased to 8%, while no evident change of the WVP can be found when the gelatin concentrations was lower than 8%.
Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and Benzoyl Acetone
Authors: Pan Zhong Wei , Ma Chang , Zhang Ying Wu , Huang Yu Xia , Chen Xing Lin , Zhang Xue Ping
Published: September 2011

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA. When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%. The extracted species in the RE3+-[Bmim]PF6-HA system was neutral REA3 and the recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.
The Influence of Alkyl Group on Needle Coke Formation
Authors: Song Shu Lei , Cheng Xiang Lin
Published: September 2011

Co-carbonization properties of toluene soluble (TS) of coal tar pitch and waste polystyrene (WPS) were studied in a tube bomb to correlate the content of alkyl groups in the mesophase pitches with coefficient of thermal expansion (CTE) and anisotropic orientation. The alkyl contents, which were increased from 12.0% to 33.3% by adding WPS into TS, improved the properties of resultant needle coke in terms of optical texture and CTE value. The anisotropic indices of average length of vectors parallel to the CTE axis and average length of anisotropic unit vectors increased from 20.8 μm to 28.4 μm and 23.4 μm to 28.8 μm, respectively, and CTE value decreased from 0.8×10-6 /°C to 0.1×10-6 /°C. Due to the increasing alkyl groups, the lower viscosity of the carbonization system favored the development of flow texture and uniaxial orientation. And the sufficient gas evolution of good timing in co-carbonization forced the uniaxial arrangement of bulk mesophase molecules at the solidification stage.
Preparation of Porous HA Bioceramics by Gelcasting and Pressureless Sintering
Authors: Zhang Jing Xian , Chen Bi Qin , Jiang Dong Liang , Lin Qing Ling , Chen Zhong Ming , Huang Zheng Ren
Published: September 2011

In the present work, porous HA scaffolds with well controlled pore size, porosity and high compressive strength were prepared by aqueous gelcasting. PMMA beads with different size were used as the pore forming agent. The compositions, microstructure and properties of porous HA bioceramics were analyzed by XRD, SEM, Hg porosimetry etc. The mechanical properties were also tested. For scaffolds with the porosity as 70%, the average compressive strength was 11.9±1.7 MPa. Results showed that glecasting process can be used for the preparation of porous HA biomaterials with well controlled pore size and improved mechanical properties.
Cutting Parameters Optimization Based on Radial Basis Function Neural Network and Particle Swarm Optimization
Authors: Li Bao Dong
Published: September 2011

A technique of cutting parameters optimization based on radial basis function neural networks and partical swarm optimization is presented in the paper. Taking experimental data as samples, the model between processing parameter and processing function was established based on radial basis function neural networks. Then, the cutting parameters is optimized by particle swarm optimization. With the combination of radial basis function neural network and particle swarm optimization, and making good use of the respective virtues,the model was solved.The experiment shows that the actual output as same as the predictive output and the mixes algorithm can realize optimization of cutting parameter real time in workplace.
Biosorption Behavior of U(VI) in Wastewater Containing U(VI) by Immobilized Saccharomyces Cerevisiae
Authors: Peng Guo Wen , Ding De Xin
Published: September 2011

In this study, Immobilized Saccharomyces Cerevisiae (ISC) was prepared through sodium alginate embedding gelatin method after the dry cells had been cross-linked by formaldehyde. The influences of solution pH, initial U(VI) concentration, and contact time on U(VI) biosorption were studied. The optimal U(VI) adsorption conditions was observed at pH 7.0, initial U(VI) concentration 60 mg.L-1, biosorbent dose biosorption equilibrium was established in 1.5h.
Preparation and Characterization of Poly(Lactic Acid) / Montmorillonite Nanocomposites via a Masterbatching Method
Authors: He Ying Ning , Guo Kai , Chen Jin Zhou , Niu Ming Jun , Wang Wan Jie , Li Xin Fa
Published: September 2011

To improve the toughness of PLA, Poly(lactic acid) (PLA)/organically modified montmorillonite (OMMT) nanocomposites were prepared via a masterbatching method. Melt index test indicated that nanocomposites had a better processability compared with pure PLA. When the loading of MMT was 3 wt%, the nanocomposites showed the maximum tensile strength (63.81MPa), and its elongation at break increased by 2.6 times compared with pure PLA. The thermal properties and crystallization behaviors of pure PLA and nanocomposites were studied by Differential Scanning Calorimeter (DSC). With OMMT loaded, the crystallinity of PLA in nanocomposites increased from 7.34% to 16.66%. The microstructure and morphology were studied by X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). It revealed that the average grain size reduced compared with pure PLA, and most of layer structure of OMMT was exfoliated.
Effect of Conformable Substrate Thickness on an Eddy Current Sensor Array’s Output Characteristics
Authors: Du Jin Qiang , He Yu Ting , Ding Hua , Zhang Hai Wei , Wu Li Ming
Published: September 2011

A finite element model of an eddy current sensor array is built up by electromagnetic-circuit couple method, and the influences of conformable substrate thickness on sensor’s output characteristics are analyzed by the model. It is shown that the amplitude of sensing coils’ output would diminish as substrate thickness increased, besides, the discrepancies of sensing coils’ output also decrease when the substrate becoming thicker. Therefore tt is necessary to make the conformable substrate as thin as possible in sensor fabrication process to enhance the crack inspecting ability of the sensor.
Effect of Particles Diameter on the Properties of Ni Group ER Fluid
Authors: Tan Suo Kui , Song Xiao Ping , Qiao Li , Guo Hong Yan , Ji Song , Zhao Hong , Zhang Yan Song
Published: September 2011

By means of structure analysis, mechanical properties test and microstructure observation，structure of Ni and Ni/TiO2group particles have been obtained, the relationship among particSubscript textSubscript textle diameter，electric field strength and shear ratio of the properties of Ni/TiO2group core-shell particles ER fluid have been researched. It has been found that with increasing particle diameter，the shear stress of ER fluid decreased, and with increasing shear ratio，the shear stress of ER fluid increased for same diameter particle and composition ER fluid. At same time, the smaller of particle diameter, the higher of ER properties such as shear stress, but there is a critical value for shear ratio, when shear ratio is larger than critical value, the properties of ER is nearly a value for same composition ER fluid. Particles chain of ER fluid under certain electric field is different with diversity Ni group Particles.
Buckling and Post-Buckling Analysis of Symmetrically Angle-Ply Laminated Composite Beams under Thermal Environments
Authors: Chang Xue Ping , Liang Zheng , Liu Qing You
Published: September 2011

Abstract: On the basis of Reddy’s higher order shear deformation plate theory and the von Kármán’s geometry nonlinear theory, governing equations for nonlinear thermal buckling and post-buckling of symmetry angle-ply laminated composite beam subjected to a temperature rise are derived, in which the stretching-bending coupling terms produced by the non-homogenous distribution of the material properties are included. By using the shooting method to solve the corresponding nonlinear boundary value problem, numerical solutions for thermal post-buckling of symmetry angle-ply shear deformation laminated composite beam with its both ends immovably simply supported under uniform temperature rise are obtained. As an example, equilibrium paths and configurations for laminated composite beam paved in term of 45/90 are presented and characteristic curves of the nonlinear deformation changing with the thermal load were plotted. The effects of the geometric and physical parameters on the deformation of the beam are also examined. The theoretical analysis and numerical results show that different thermal expansion coefficient ratio, elastic moduli ratio, will influence of the non-dimension critical buckling temperature.
Mechanical Study and Microscopic Characterization of Lignin/PE Composites
Authors: Lv Xin Ying , Gao Zhen Hua , Zhang Yan Hua , Di Ming Wei
Published: September 2011

The lignin/PE composites with different compatibilizing agents were extruded and the tensile properties have been tested. The weight ratio of PE, ligin and PE-a-MAH were 7.5%, 10%and 12.5wt%; the weight ratio of PE, ligin and PP-a-MAH were 5%, 7.5% and 10wt% respectively. Scanning Electron Microscopic (SEM) was used to characterize the morphology of the composites. The tensile strengths of lignin/PE composites with PE-g-MAH were higher than that one with PP-g-MAH. Both of them were higher than that one without any compatibilizing agent. And PE-g-MAH was the better compatibilizing agent confirmed by the mechanical tests and SEM results.
Effect of Microelements on Sn-20Bi Solder
Authors: Li Yuan Shan , Luo Yu Feng , Chen Xu
Published: September 2011

Adding microelements Ag In Ga and Sb into Sn-20Bi solder, the changes of melting properties and microstructures of the solder were observed. The experimental result showed that when the content of Ag was 0.7% (wt%), In was 0.1% , Ga was 0.5% and Sb was 0.5%, the melting points of the solder reduced to the bottom and the segregation of Bi obviously decreased. Sb was not suitable to add solely but when it was added together with Ag In and Ga, it can produce a good effect on reinforcement of solid solution, furthermore it can restrain the phase change of Sn. The Sn-Bi-X solder with the best compositions of Ag In Ga and Sb has a near melting point to Sn-37Pb. The solder is close to practicality without segregation of Bi.
Intercalation Lithium Behavior of Molybdenum Disulphide as Anode Materials for Lithium Ion Battery
Authors: Zhao Ting Kai , Li Guang Ming , Liu Le Hao , Liu Yong Ning , Li Tie Hu
Published: September 2011

The electrochemical property of molybdenum disulphide (MoS2) as anode materials for lithium ion batteries was studied using two-electrode Li-ion cell. The first reversible capacity of MoS2 treated by using ball milling and doped graphite was 617mAhg-1 and 506mAhg-1 respectively. But the reversible capacity of pristine MoS2 was 661mAhg-1. The results indicated that the processes of ball milling and doped graphite of MoS2 can not widely enhance the reversible capacity.
Model Test Research on Subsidence of Geogrid-Reinforced and Pile-Supported Foundation
Authors: Chen Rong Jun , Zhang Chao , Tian Yan Feng , Guo Juan
Published: September 2011

It has studied the subsidence characteristics of the geogrid-reinforced and pile-supported foundation through eleven loading model tests, and analyzed the effects that varied pile spacing, reinforced floors, the paving position of the reinforcement, underlayer thickness have had on the subsidence of the geogrid-reinforced and pile-supported foundation.
Removal Soil Lead (Pb) from EDTA Leachate by Bentonite and Modified Bentonite
Authors: Fu Yu , Cui Yan Shan
Published: September 2011

There is little information about removal soil Pb from EDTA leachate. Modified bentonite was successfully synthesized from original bentonite and iron (Fe) in this study. Removal efficiency of Pb from the EDTA leachate using the modified bentonite was higher than that of original bentonite. The highest removal efficiency of Pb was 65% with modified bentonite with pH 3.0. The results of this work proposed a potential way for removal of soil Pb from the EDTA leachates.
An Approach to Establish Interlaminar Micro Structure of 3-3 Connectivity in Laminated Composites
Authors: Liu Gang , Zhang Dai Jun , Zhang Peng , Yi Xiao Su
Published: September 2011

This article is intended to outline a novel concept of interlaminar 3-3 connectivity of fiber-reinforced laminated composites. This microstructure is typically realized by using thorny ZnO whiskers exactly located in the interlayer of glass or carbon fabric for RTM. From the initial testing, the interlaminar shear strength (ILSS) is noted to increase up to 150% while retaining the most other in-plane properties. Mechanistic penetrating and pinning are considered to be the dominant mechanism of interlaminar toughening effect, with the evidence of the broken, fragmented and pull-out whiskers observed in the fracture morphologies.
A Simple Method to Disperse Carbon Nanotubes by Shearing Process
Authors: Wu Xi Wang , Xiao Jian Zhong , Xia Feng , Hu Yong Gang , Peng Zhou
Published: September 2011

The key problem to prepare carbon nanotubes (CNTs) reinforced ceramic matrix composites is how to break up massive agglomerates of CNTs and disperse uniformly CNTs. We obtain the CNTs-Al2O3composite powder by shear treatment on melted CNTs-Al2O3-agents mixture. Microstructure observations of CNTs-Al2O3composite powder show that CNTs can be dispersed uniformly by shearing process. The rheological results also affirm the conclusion. According to the rheological theory, we build the ideal dispersion model of CNTs-Al2O3suspension system and discuss the dispersion mechanism.
The Damage and Texture Features of High-Speed Rail(THS) Wheel Tread Based on EBSD
Authors: Zuo Hong , Wang Feng Wen , Feng Yu Hong
Published: September 2011

In this paper, the microscopic features of damage and texture of a wheel tread in high-speed rail were investigated by EBSD. The microscopic sample was cut from the wheel tread zone of a used high-speed rail wheel. It was found from the microscopic investigation that the density of austenite distribution is increased near the wheel tread, and the damage voids distribute far away from the wheel tread zone. The texture analysis with two magnify zone indicated that there exists large amount of twin-crystal within the ferrite in the dimension of 20 micrometer, and the dimension of austenite and martensite decreases in the edge zone of the wheel tread.
Research on Mechanical Properties of FML
Authors: Wang Chang Hao , Tian Jing , Lu Xiang
Published: September 2011

According to the finite element method, this article has established the FML’s finite element model. By comparing to the test data and studying of the tensile behavior of FML, it has verified valid of the model. When the aluminum layer yields under the tensile load, the composite layer has the most tensile load. And the model has been developed to predict the stability influenced by the rib’s height.
Effects of Modified Carbon Nanotubes on Curing and Mechanical Properties of N-Phenyl Maleimide/Bismaleimide Composites
Authors: Liu Lin , Song Jing , Wang Chong
Published: September 2011

One kind of bismaleimide resin (BMI) was prepared from Michael addition reaction with modification carbon nanotubes (m-CNTs). CNTs were modified by N-phenyl maleimide (N-PMI) and ethylenediamine. The effect of modification was determined by NMR spectra and Raman Analyser. The cure kinetics, thermal behavior and mechanical property of carbon nanotubes/bismaleimide-o,o-diallyl bisphenol A resin (CNTs/BMI-BA) were studied. It was found that this kind of CNTs can be easily dispersed in high performance resin only with a slight stirring. The curing apparent activation energy (Ea) decreased with the increasing amount of m-CNTs. The maleimide-CNTs could fully express its unique mechanical properties and dramatically increase the reaction activity, the storage modulus, impact strengths and bending stress of the CNTs/BMI-BA composites while the CNTs-COOH reduce the important mechanical properties. These critical enhancements will definitely help to attract more researches in this field.
Preparation and Properties of Nanocomposites Based on Poly(Vinyl acetate) and Montmorillonite Organized with Acrylic Acid
Authors: Wang Jun
Published: September 2011

The nanocomposites of poly(vinyl acetate)/montmorillonite (PVAc/MMT) were prepared using vinyl acetate and organically modified alkaline calcium base montmorillonite (MMT) by in situ emulsion copolymerization. The organic modification was acrylic acid including terminal reactive vinylic group. The samples were characterized using fourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD). Thermal properties of the PVAc/MMT films were studied by thermogravimetric (TG) and differential scanning calorimetric (DSC). The FT-IR results indicated that the vinyl group on the surface of the vinyl MMT nanoparticles had been successfully copolymerized with vinyl acetate. The XRD results demonstrated that the MMT was exfoliated during polymerization. The exfoliated PVAc/MMT nanocomposites showed a lower glass transition temperature (Tg) and a worse thermal stability compared with the pure PVAc. However, bonding power of the nanocomposite latex of PVAc/MMT was improved due to the strong interaction between silica nanoparticles and polymer matrix via covalent bonds.
Study on Threading-up Characteristics of Buttress Thread of Petroleum Coupling
Authors: Liu Jian , Li Gang , Song Yu Kun
Published: September 2011

This article is taking 5.5"special thread petroleum casing-pipe as example, using nonlinear technology of Ansys FEA software to analyze characteristics of threading up and unload of the petroleum casing-pipe. The result of FEA is conformed to the experiment. It provides strong help for the enterprises using research data to instruct practice further.
Optical Properties of in-Doped Wurtzite ZnO Based on First-Principle
Authors: Xie Fang Wei , Li Pei , Zhang Li Qiang , Wang Xiao Liang , Wang Huan , Song Xi Fu
Published: September 2011

In-doped ZnO thin film has been found as one of the most promising materials in the optoelectronics, but its optical properties are rarely reported. We calculated optical band gaps and optical properties of Zn1-xInxO with different In doping by using first-principle. The results reveal that the lattice constants of Zn1-xInxO increase linearly with the doping increasing and Zn1-xInxO (x=0.125, x=0.25) crystal comes to be degenerate semiconductor with band gap reduced. The imaginary part of dielectric function has an increasing trend and the absorption capacity significantly increases in ultraviolet (UV) range after doping. Also there is an obvious red-shift in the absorption spectrum. The reflectivity and energy loss spectrum were investigated, too. The results can provide a theoretical reference for finding appropriate UV protective material.
Performance of Concrete Made with Manganese Slag
Authors: Liang Duo Qiang , Qin Feng , Li Xu Guang , Jiang Ji Bo
Published: September 2011

It is of great importance to innocuity, minimization and reutilization of manganese slag generated in manganese product by electric furnace process. In the paper, ordinary Portland cement was replaced partly by manganese slag to then evaluate manganese slag’ effect on mechanical performances of them. The experimental results obtained show that ordinary Portland cement added less than 30% by manganese slag was improved in mechanical performances and the cement concrete added less than 30% by manganese slag was not changed significantly. To lower economic cost and achieve enhanced mechanical performances, manganese slag can be substituted partly to cement concrete.
Poly(Imino Ketone)s Containing Sulfone Group
Authors: Chang Guan Jun , Luo Xuan , Zhang Lin , Lin Run Xiong
Published: September 2011

Aromatic diamine and dibromide with sulfone group as the monomers, three kinds of sulfoned-poly(imino ketone)s (PIKSs) were synthesized via C-N cross-coupling reaction. Their structures were characterized by means of FT-IR and 1H NMR, and the results showed an agreement with the proposed structures. The condensed structures of PIKSs were tested by WXRD, and the WXRD measurement results showed that these polymers had amorphous constitution. Also their thermal properties were tested by DSC and TG, the results indicated they featured high Tg (Tg >200°C) and good thermal stability (T5%﹥440°C). In addition, the adoption of sulfone group increased PIK’s solubility in organic solvents, and PIKSs were soluble in most commonly used organic solvents.
Preparation and Microwave Absorption Property of the Core-Nanoshell Composite Materials Doped with Nd
Authors: Che Ru Xin , Yu Bing , Wei Li Qiu
Published: September 2011

The core-nanoshell composite materials doped with Nd were prepared by a solid-state reaction method. The core is magnetic fly-ash hollow cenosphere, and the shell is the nanosized ferrite doped with Nd. The thermal decomposition process of the sample was carried out by the thermogravimetry and differential thermal analysis ( TG-DTA ). The morphology and components of the composite materials were investigated by the X-ray diffraction analysis ( XRD ), scanning electron microscope ( SEM ) and energy disperse spectroscopy ( EDS ). The microwave absorption property was investigated by vector network analyzer ( VNA ). The results indicated that the exchange-coupling interaction happens between ferrite of magnetic fly-ash hollow cenosphere and nanosized ferrite coating. The exchange-coupling interaction enhances magnetic loss of composite materials. So, in the frequency between 1 MHz and 1 GHz, the absorbing effectiveness of the core-nanoshell composite absorbers can achieve –31 dB, it is better than single material and is consistent with requirements of the microwave absorbing material at the low-frequency absorption.
Study on the Disaggregation of Photosensitizer Pentalysine β-Carbonyl-Phthalocyanine Zinc In Vitro
Authors: Li Chun Yan , Ruan Guan Yu , Dong Sheng Xiong , Shi Xiao Li , Chen Jin Can , Huang Ming Dong
Published: September 2011

A novel photosensitizer, pentalysine β-carbonyl-phthalocyanine zinc [ZnPc-(Lys)5] has tendency to form aggregate in aqueous solution. The observed in vivo Photodynamic therapy (PDT) effect of ZnPc-(Lys)5suggests a disaggregation mechanism. In this study, the equilibrium binding constant Ka, the numbers of binding sites n and the distance of Forster radii r between ZnPc-(Lys)5and human serum albumin (HSA) are measured by Spectroscopy. A molecular model of HSA-ZnPc-(Lys)5complex was generated according to these datum. This molecular model provides rationale that the molecular interaction between HSA and ZnPc-(Lys)5facilitates the dissociation of ZnPc aggregates.
Research of Plastic Material Dynamic High-Speed Tensile Machine’s Measurement and Control System Based on FPGA
Authors: Xu Xin Hu , Li Gui Qin , Guo Qing , Lin Feng , Cai Xin
Published: September 2011

This paper will give a solution of measurement and control system based on FPGA embedded system for the Plastic Material Dynamic High-speed Tensile Machine (PMDHTM) with 1-100s-1strain rate range. Using sub-modules design of Nios II soft-wore and SOPC to build measurement and control system. The state machine algorithm and servo drive device are applied to accomplish precise state control of the linear shaft motor. Collecting the stress data online and non-contacting strain measurement is adopted. The test result can well meet the linear motor control response demand below the 5Hz frequency. Compared with other control based on SCM, DSP and so on, it supplies an innovation way for the PMDHTM control.
Effects of Liquid Nitrogen on Cryogenic Machining of Aisi D2 Hardened Steel
Authors: Ravi Samraj , Pradeep Kumar Murugasan
Published: September 2011

The milling of hardened steel generates very high temperature in the cutting zone, and leads to detrimental effects on the cutting force, workpiece surface finish and tool life. Cryogenic machining is an environmental friendly new approach for the desirable control of the cutting temperature in the cutting zone. The present work investigates the effect of cryogenic cooling by liquid nitrogen (LN2) on the cutting temperature, cutting force and workpiece surface roughness on the end milling of AISI D2 steel by CVD TiN coated carbide insert, at a constant cutting speed of 100 m/min and varying feed rate in the range of 0.01-0.02 mm/tooth. The experimental results showed that with LN2 as a coolant the cutting force and workpiece surface roughness were reduced compared to dry and wet machining due to the better lubrication and cooling effect through reduction of cutting zone temperature.