bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Tunnel Excavation on Adjacent Underground Pipeline
Authors: Liu Jin Long , Liu Jie Qun
Published: November 2010

Based on nonlinear finite element method, the influence of tunnel construction on adjacent underground pipeline is studied. It is shown that remarkable settlements occurred above tunnel working surface due to tunnel excavation, and soil bulged below tunnel working surface due to load-off. The inhomogeneous deformation of pipeline become more serious when the distance between tunnel working surface and pipeline become shorter. So it is important to keep enough distance between tunnel working surface and pipeline. The deformation of pipeline become less when the radius of tunnel decreased. It is also find that there is no obvious influence on settlement of pipeline with different materials of pipeline. The settlement of pipeline can be reduced and stability of tunnel can be enhanced evidently by local excavation above tunnel working surface. Therefore, local excavation above tunnel working surface can be prior used to protect underground pipeline if allowable.
Effect of Nano-Oxides on Sintering and Crystallization of Fused Quartz Ceramic Materials
Authors: He Yong Wu , Wang Zhi Fa , Ma Fei , Bu Jing Long , Zhao Hong Yan , Wang Rong Lin
Published: November 2010

Fused quartz ceramic was prepared in air atmosphere at 1300°C, 1350°C and 1400°C for 1h with fused quartz powder as raw materials (size<0.06mm) and with nano-Cu2O or nano-ZrO2 as additives (size<0.1μm). The effect of nano-Cu2O and nano-ZrO2 (size<0.1μm) on crystallization and sintering of the fused quartz ceramic materials were researched by measurements of apparent porosity, bending strength and thermal expansion rate, and analyses of XRD and SEM. The results showed that nano-Cu2O had detrimental effect on sintering and promoted crystallization of fused quartz, and nano-ZrO2 had better facilitating effect on sintering and better effect of inhibiting crystallization of fused quartz. So, samples with nano-ZrO2 had lower apparent porosity and higher bending strength and more compact microstructure and least thermal expansion rate.
Trisiloxane Surfactants Technology Optimization and Impact of Surface Tension
Authors: Tao Bo , Zhang Li Bin
Published: November 2010

Trisiloxane surfactants can significantly enhance the biological activity of pesticides, in order to optimize of synthesis technology,in this paper,there was no gas protection,cleared trisiloxane surfactants optimization conditions by took the sample at different reaction time and measured degree of reaction degree by chemical titration method,infrared spectroscopy characterized,deteminated surface tension and controled weeds. This technology is more convenient than existent technology.The best reaction conditions:catalyst was 10mg/L,reaction temperature was 80 ,material ratio was 1:1.2, reaction time was 5 hours,the degree of their response would totally up to 93.83%.The surface tension compared with Silwet408 no significant difference to water and liquid. Different reaction degree trisiloxane surfactant could increased weed control of fomesafen differently.When added reaction degree 93% trisiloxane surfactant,dosage 1‰((v/v),enhanced observing 28.5% and fresh weight 29.5% than 252g ai/hm-2 only treated.Thus,this method could be used in production of trisiloxane surfactants.
Experiment Study on the Frost Resistance of Steel Fiber Reinforced Concrete
Authors: Jiang Lei , Niu Di Tao , Bai Min
Published: November 2010

In order to study various factor affecting durability of steel fiber reinforced concrete (SFRC), basic experimental research that combine the action of freezing-thawing cycles and deicing salt to SFRC was conducted. In the experiment, the volume fraction of steel fiber and number of freeze-thaw circulation are taken as variable parameter. Based on the different numbers of freeze-thaw circulation, weight losing of SFRC, splitting strength and the dynamic modulus of elasticity were measured. Furthermore, the reinforced mechanism of the SFRC under the action of freeze-thaw was analysed. The test results show that after adding a certain amount of steel fiber to the concrete, cracks in concrete at early stage are effectively prevented and the permeability of concrete is obviously reduced, thus the durability of concrete is improved. The reinforced actions of steel fiber on splitting strength of concrete are notable and the influence of steel fiber volume fraction on the frost-resisting property is obvious. On the contrary, the negative effects of steel fiber with high volume fraction on the splitting strength of concrete exist. The best performance of SFRC can be got when the steel fiber quantity is 1.5%.
Nonlinear Seismic Response Analysis Method for Steel Mega-Frame Structures Based on Improved Finite Segment Element Plastic Zone Model
Authors: Xu Guo Lin , Zhang Ling Xin , Bai Ya Shuang
Published: November 2010

When conducting nonlinear analysis of frame structure, we usually adopt plastic hinge model or plastic zone model which based on bending beam theory. But the effect of shear deformation on element deformation are not considered in the analysis model established based on bending beam theory, which is only applicable to the elements with large span depth ratio. For the main structure of steel mega-frame structures, the depth of element section is very high. Thus it can not meet bending beam theory assumption. The common analysis model can not simulate structure reaction accurately. This article puts forward some treatment methods for existing problems of nonlinear analysis of steel mega-frame structures, establish member element stiffness matrix based on improved finite segment element plastic zone model and consider the effect of element shear deformation on plastic development.
Mechanical Performance of Straw Fiber Reinforced Desulfurization Gypsum Composite Materials
Authors: Wang Yu Yin , Li Guo Zhong
Published: November 2010

In order to improve the mechanical performance of straw fiber reinforced gypsum composite materials, corn straw fiber was modified by alkaline treatment and chemical coating treatment, the influence of different surface modification treatment on mechanical performance of gypsum composite material was studied, and the mechanism of surface modification was discussed. The results indicated that: surface modification treatments could improve the interfacial bonding between straw fiber and desulfurization gypsum, and enhance mechanical performance of composite materials; comparing different treatments, the acrylic chemical coating treatment could enhance the strength of composite materials more outstandingly than other treatments.
Study of Surface Modification of Recycled Aggregate and Interfacial Zone Microstructure of the Concrete
Authors: Cui Hong Zhi , Xing Feng
Published: November 2010

Due to most of recycled aggregate (RA) possesses higher water absorption, therefore, the process of mixing recycled aggregate concrete (RAC) is more complex than that of normal aggregate concrete (NAC). In this paper, an organosilicone modifier was used to modify RA to reduce its water absorption. Four mixes of concrete were made up with modified RA at a concentration of 1:1, modified RA at a concentration of 1:2, unmodified RA, and NA, respectively. The water absorption unmodified RA and modified RA was compared, and effect of RA surface modification on the microstructure of the interfacial transition zone (ITZ) between the RA and the hardened cement paste was examined. The investigation results show that a higher concentration of modifier is more effective in reducing the water absorption of RA; and there is an optimal value of modifier concentration, and the use of in high concentrations modifier will adversely affect the integrity of interfacial zone.
Synthesis and Photovoltaic Properties of Fluorene-Based Copolymers
Authors: Hou Qiong , Zeng Xiang Hua , Zhen Hong Yu , Li Guo Long , Guo Ting , Xu Xin
Published: November 2010

A serial of polyfluorene copolymers have been developed by covalently attaching thiophene units to the side chain of polyfluorene with an alkyl spacer by means of Pd-catalyzed Suzuki coupling reactions. The electrochemical, photophysical and photovoltaic properties of the copolymers were studied. The absorption spectra of the copolymers measured in thin films display two absorption peaks. The power conversion efficiency achieved in the device configuration ITO/PEDT/ PFO-FT-DBT: PCBM (1:2)/Al is 0.83% with open-circuit voltage (Voc) 0.75V. Further investigation of more polyfluorene copolymers with narrow band gap aryl-hetero cycle units on the side chain is in progress.
Sandwiched Wood-Plastic Composites with Flame-Retardant Skin
Authors: Lei Wen , Ma Hong Ming , Xu Yi
Published: November 2010

In order to improve the flame retardancy of wood-plastic composites,a new sandwiched composite is introduced in this paper with basic magnesium sulfated whisker(MOS) filled high density polyethylene(HDPE) as skin and wood flour filled HDPE as core.The oxygen index of the skin and the mechanical properties of the whole sandwiched composite are investigated. The results show that, the flame retardancy of the skin will be improved siginicantly when much MOS is used,and the skin containing 40wt% MOS has an oxygen index of 25.6%,in addition,the sandwiched composite in which both the mass contents of MOS in the skin and wood flour in the core are 40% has better mechanical properties than the traditional wood plastic composite(WPC) without any skin,and the sandwiched WPC is more fatigue-resistant.
The Study of Sputtered Silver-Based Low-Emissivity Coating on Glass
Authors: Cai Bin , Xin Rong Sheng , Jia Xiao Lin
Published: November 2010

Two types of low-emissive coatings were deposited onto glass substrates by magnetron sputting method, which were designed as Ag and TiO2/Ni-Cr/Ag/Ni-Cr/TiO2. The transmittance and thickness of the samples were measured by TH1901 spectrophotometer and NKD-8000V ellipsometer. Fourier transform infrared spectrometer (FTIR) was employed to detect the low emissivity properties, it demonstrated that the silver-based multilayer coatings showed an efficient heat isolation due to their low emissivity properties. And they had a good performance in the visible range compared to the single Ag layer according to the transmittance spectra as well. The surface morphology of the samples was investigated by scanning probe microscope (SPM), it was determined that the Ag layer formed a homogeneous grain size when deposited onto the Ni-Cr layers.
Vibration Research of Gear Box in H5 Mill for Alloy Bar's Rolling Process
Authors: Wei Li Qun , Qu Zhi Hao , Chen Han Hui , Liu Mou Yuan , Zhang Xing Yao
Published: November 2010

The abnormal vibration of H5 mill’s gear box has influenced the implementation of the energy-saving process in the alloy bar production line of special steel branch, Baosteel limited company. The reasons of the abnormal vibration have been determined by experiment and ANSYS finite element analysis, and corresponding measures have been provided. The rigidity of the gear box has improved by reinforcing ribs. By applying the reinforced gear box, the abnormal vibration has been effectively inhibited and the implementation of the energy-saving process has been guaranteed.
Study on Application of Modified Polyethylene in Preparation of Wood-Plastic Composites
Authors: Lü Qun , Zhang Qing Feng , Feng Hai Ke , Lai Guo Qiao
Published: November 2010

The wood-plastic composites (WPC) were prepared via compress molding by using the blends of high density polyethylene (HDPE) and modified polyethylene (MAPE) as the matrix and wood flour (WF) as filler. The effect of MAPE content in the matrix on the mechanical properties of the matrix and WPC was investigated. It was shown that the change of MAPE content in the matrix had no influence on the tensile strength of the matrix, but markedly reduced the impact strength of the matrix. Additionally, it had significant influence on the strength of WPC. When the content of wood flour and the content of the matrix remained fixed, with increasing the content of MAPE in the matrix, the tensile strength and the flexural strength of WPC tended to increase rapidly initially and then become steady. Moreover, with the increasing of MAPE concentration, the impact strength of WPC decreased when the low content of wood flour (30%) was filled, but increased at high wood flour loading (70%).
Synthesis, Characterization and Thermal Analysis of Rod-Shaped Polyaniline-Barium Ferrites Nanocomposites
Authors: Li Yuan Xun , Liu Ying Li , Zhang Huai Wu , Ling Wei Wei
Published: November 2010

The rod-shaped polyaniline (PANI)-barium ferrite nanocomposites were synthesized by in situ polymerization of aniline in the presence of BaFe12O19 nanoparticles with diameters of 60-80 nm. The composites obtained were characterized by infrared spectra (IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The thermal stability and the composition of the composites were investigated by TG-DTG analysis. The results indicate that the thermal stability of the composites is higher than that of the pure PANI which can be attributed to the interactions existed between PANI chains and ferrite particles.
Hydrothermal Synthesis and Adsorption Proprieties of Titania-Active Carbon Composites
Authors: Luo Yue , Yan Xue Min , Yang Huan , Su Gao Shen
Published: November 2010

Titania nanoparticles were anchored onto active carbon (AC) through a hydrothermal process to obtain TiO2/AC composites. The optimal TiO2 loading and hydrothermal pH were investigated. The prepared TiO2/AC composites were used as adsorbents for dibenzothiophene (DBT) from model fuel. The adsorption capacity of TiO2/AC composite in the optimal synthesis conditions has enhanced 12.4% compared with pure AC. The adsorbents were regenerated by toluene washing, and the TiO2/AC composite showed higher adsorptive capacity than AC even after three recycles. The pore structure and surface chemical proprieties of TiO2/AC composite and AC were also investigated by N2 adsorption-desorption isotherms and Beohm titration. The results indicate that the surface acidic sites of TiO2/AC may play an important role in the improved adsorption performance.
Tool Materials Design and the Sintering Optimization Based on Interface Strengthening Theory
Authors: Yang Fa Zhan , Meng Guang Yao , Zhou Jian Qiang , Li Chang He
Published: November 2010

Nowadays, nanocomposite tool materials are very important in engineering field for their excellent mechanical properties and stability under high temperature and have a good foreground in the coming years. However, there are lots of puzzles to be discussed in the materials design theory and the fabrication processing due to the difference between the traditional materials and the nanocomposite. In this paper, a new tool materials design method is proposed based on the interface strengthening theory. The sintering temperature and the soaking time are optimized based on the interface strengthening theory and the relative density of the tool materials is also discussed. The wild phase content can be fixed by calculating the debonding interface rate and the strength requirement of the tool materials. Meanwhile, a series of experiments are carried out to fabricate and optimized the nanocomposite tool materials under the guider of the interface strengthening theory. Results show that experimental data is in accordance well with the calculation and the interface strengthening theory.
Study on Performance of Epoxy Asphalt Concrete Applied in the Deck Pavement of Pingsheng Steel Bridge
Authors: Wang Wen Qiang , He Hua Yan
Published: November 2010

As a fair deck pavement material of its kind used in steel bridge, the epoxy asphalt concrete is considered much more superior to ordinary asphalt concrete in terms of road performance, while still greatly subject to the level of design and construction. Starting from a practical case of the epoxy asphalt concrete that has been applied in the deck pavement of Pingsheng Steel Bridge, this paper centers on a comprehensive study and discussion of the epoxy asphalt mixture, specifically in aspects of physical and mechanical performance test of stability under high temperature, performance under low temperature, tortuosity, immersion stability, linear contraction performance, fatigue performance and oil-erosion resistance performance. This will provide positive instruction for future deck pavements on steel bridges.
The Engineering Properties Comparative Study of Wetlands Soft Soil and Soft Soil of other Genesis
Authors: Liu Hong Jun , Shan Wei , Yang Yan Qiu , Wang Chun Jiao , Guo Ying , Wang Pi Xiang
Published: November 2010

In order to provide technical reference in soft soil foundation treatment for construction of high-grade highway in wetlands soft soil area,by collecting undisturbed soil samples in Qiqihaer-Fuyu section of Jiagedaqi-Beijing highway and using triaxial tests, direct shear test, compressed consolidation testing and other testing methods, a detailed laboratory test and study has been carried out on the soft soil engineering properties and the comparative study on physical and mechanical index, compressed consolidation properties, shearing strength and shearing strength index and so on of wetlands soft soil and other genesis soft soil has been carried out,the results showed that: wetlands soft soil is better than delta soft soil in basic physical and mechanical index; comparing shearing strength parameters of wetlands soft soil and lacustrine soft soil shows that: under smaller consolidation degree and the consolidation pressure, their cohesion decreased with the increase of consolidation degree;with the consolidation degree and the consolidation pressure become bigger, the cohesion of wetlands soft soil is higher than lacustrine soft soil, internal friction angle changed little; Comparing with marine soft soil, the primary consolidation coefficient of wetlands soft soil is bigger and the secondary consolidation coefficient is smaller, that shows the foundation of wetlands soft soil is easy to drainage and consolidation. The research results have guiding significances for treatment of wetland soft soil foundation.
Synthesis and Characterization of Modified Zn-Antibacterial White Carbon Black
Authors: Zhang Bin , Tang Xiao Ning , He Tao , He Su Qiong , Yao Wen Rong
Published: November 2010

This paper investigated the preparation and characterization of the Zn-antibacterial White Carbon Black modified by electrolyte, surfactant, and organic solvent. The sol-gel method was used to prepare the White Carbon Black carrier. Zn2+ was selected to be the antibacterial ion, and Sodium nitrite (electrolyte), Sodium dodecylbenzene sulfonate (Surfactant), Ethanol (organic solvent) was selected to be the modifiers. They were synthesized on the white carbon black carrier. These as-synthesized modified antibacterial materials were characterized by inductively coupled plasma, particle size measurement instrument and enumeration tests (Escherichia coli as experimental bacterium). The result showed that the amount of antibacterial ions and bacteriostasis rate of modified Zn-antibacterial white carbon black are higher than those for the common Zn-antibacterial white carbon black. In addition, the particle sizes of modified samples can be extended down with a narrow size distribution. Other advantage of modified Zn-antibacterial white carbon black is good thermal stability.
Effect of Annealing Temperatures on the Microstructure of CuInS2 Thin Film by One-Step Electrodeposition
Authors: Lu Lin , Wang Yan Jie , Li Xiao Gang
Published: November 2010

CuInS2 thin film used for photovoltaic applications was prepared by one-step electrodeposition. The films were annealed at different temperatures of 350, 400, 500 °C. Effects of annealing temperatures on the properties of the film were investigated by the way of X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis-NIR Spectroscopy. The result shows that CuInS2 film with chalcopyrite structure can be successfully prepared by one-step electrodeposition. Annealing is effective in improving the crystallinity of the thin film. The temperature of 400°C is favorable to the grain growth of the film without the generation of impurity.
Study on Resistance to Chloride Ion Penetration of High Performance Concrete for High Speed Railway Bridge Pile
Authors: Cui Sheng Ai , Ye Yue Zhong , Fu Fei , Liu Zhi Feng
Published: November 2010

Taking bridge pile of high speed railway as background, resistance to chloride ion penetration of high performance concrete is studied. Theoretical analysis and experimental research of chloride ion penetration are carried out for double-doped mineral (fly ash and slag powder) concrete, C35 single mineral and preservative double-doped concrete, and C35 two kinds of minerals and preservative composite concrete. In addition, the test results are compared and analyzed. Study results show: chloride ion penetration grade of double-doped mineral concrete (C35, C40, C45 and C50) is very low. Resistances to chloride ion penetration of C35 single mineral and preservative double-doped concrete are all poor overall, so the scheme is infeasible. By performance comparison of resistance to chloride ion penetration, C35 two kinds of minerals and solid preservative composite concrete is obviously better than C35 two kinds of minerals and liquid preservative composite concrete , meanwhile obviously better than C35 double-doped mineral concrete, and very close to C50 double-doped mineral concrete. And, it can meet resistance to chloride ion penetration requirement under the corrosion environments along the high speed railway line and can be used as high performance concrete to resist chloride salt.
Preparation of Exfoliated Polyethylene/Clay Nanocomposites at High Clay Content
Authors: Hong Hao Qun , Zhang Hai Yan , He Hui , Jia De Min
Published: November 2010

The polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by melt blending the organic MMT with the ternary-monomer graft copolymers of polyethylene (GPE) which were prepared by solid phase grafting maleic anhydride, methyl methacrylate and butyl acrylate onto PE. Fourier transform infrared spectroscopy was used to characterize the structure of GPE. X-ray diffraction patterns and transmission electron microscopy were used to characterize the morphology of GPE/MMT nanocomposites. Results showed that GPE was an outstanding polymeric material to prepare an exfoliated polymer/layered silicates nanocomposites due to the high polarity of GPE and high graft degree. Most layered silicates still maintain the exfoliated and well dispersed state even at 40 phr OMMT content. The exfoliation of layered silicates was attributed to the well intercalation and easy wetting of the grafted oligomers.
Evaluation on Performance of Functional Polymer
Authors: Wu Wen Xiang , Jiang Zhao
Published: November 2010

The performance of two kinds of functional polymers were evaluated by lab experiments. Furthermore, relationship between viscosity and concentration, viscosity stability, flow characteristics of two kinds of functional polymers are studied. The results show that two functional polymers have a higher viscosity at different concentrations. The viscosity of functional polymer increases with the time. Flow characteristics show that functional polymers have a higher drag coefficient and residual resistance factor. Meanwhile, we conducted displacement efficiency experiments and expand swept volume experiments. The studies show that two kinds of functional polymer provide significant improvement in displacement efficiency, and after conventional polymer flooding, it also can expand swept volume of low permeability layers effectively.
Enchancement of Mechanical Properties in BaTiO3 Ferroelectric Thin Films
Authors: Lu Cheng , Deng Xiang Yun , Guan Xiao Fen , Tan Zhong Wen , Zhang Yan Jie , Yang Ren Bo , Han Li Ren
Published: November 2010

Surface structure and mechanical properties of BaTiO3 thin films prepared by sol-gel process were investigated by XP-2 profiler and nano-indention. The results indicated that the thickness of thin films got thicker with sintering temperature and the thickness-increasing rate differ from different solvent. The hardness and elastic modulus were enhanced due to the presence of residual stress which was compression and probably induced by fabrication method. The maximum hardness is 9.98GPa when the Young’s modulus is 127.41GPa with ethanol as solvent sintered at 1000oC.
The Research on Influencing Factors of Polymer Flooding
Authors: Wu Wen Xiang , Zhu Si Nan
Published: November 2010

By using artificial non-homogeneous cores which coefficient of variation is 0.72 to simulate reservoir sandstone, and proceed the research of displacement effect on three aspects, which are polymer molecular weight, polymer solution concentration and reservoir permeability. The results show that polymer solution concentration and polymer molecular weight have greater influence on the displacement efficiency, while reservoir permeability has very little influence when it is more than 700md.
Preparation and Performance Study of Reflection Heat Preservation Insulation Coating
Authors: Zhao Su , Qiu Li Yuan , Liu Shuang
Published: November 2010

The influence of film forming matter to heat preservation insulation coating reflectivity was studied. Organosilicon modified styrene-acrylic emulsion was selected as film forming matter through the infrared spectrum test. The influence of several kinds of pigment and filler to reflectivity was studied by orthogonal experimental design . Importance of factors from large to small in turn is: Rutile titanium dioxide> Kaolin> expanded perlite、hollow glass microsphere> iron oxide red, and the formula of pigment and filler was determined .The influence of rutile titanium dioxide to reflectivity was studied, the reflectivity of coating is superior when rutile titanium dioxide grain size is in the range between 0.130 m and 0.136 m. Film thickness has certain influence to reflectivity ,when the thickness is 0.062cm, the reflectivity of coating reaches the highest,is 73.28%.
Physical and Electrochemical Properties of Layered Li[Ni1/3Co1/3Mn1/3]O2 Cathode Materials
Authors: Wang Jing , Wang Chun Mei , Wang Ling
Published: November 2010

Li[Ni1/3Co1/3Mn1/3]O2 was synthesized by modified combustion method and effect of calcination temperature on characteristics was investigated. The cycle of Li[Ni1/3Co1/3Mn1/3]O2 was determined by electrochemical measurements, the microscopic structural features were investigated using Fourier transform infrared spectroscope(FTIR), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD). The results show that the compound has layered structure with hexagonal lattice. With the increase of calcination temperature, the size of primary particle rises. The Li[Ni1/3Co1/3Mn1/3]O2 calcined at 900 oC shows excellent electrochemical performances with large reversible specific capacity of 152 mAhg-1 in the voltage range of 2.75-4.20 V.
Effect of Thermal Conduction on Tribological Properties of Polytetrafluoroethylene Based Composites
Authors: Xie Ting , Chen Gang , Yin Yan Guo , Jiao Ming Hua , Yu Jian Wei , Yan Zhao Ming , Xu Zhen Xing
Published: November 2010

Due to the poor thermal conduction of polytetrafluoroethylene (PTFE), some fillers are often added into PTFE matrix to improve its thermal conduction and enhance its tribological performance. In our work, to increase their thermal conduction, the PTFE composites with different contents of copper particles were prepared. The friction and wear properties of the composites were tested. The effect of thermal conduction on tribological properties of the PTFE based composites was analyzed, and the wear mechanisms were also discussed. The results showed that with the increase of the thermal conductivity of the PTFE based composites, the coefficient of friction of the materials reduced, and the wear of the materials was dramatically decreased.
Study on CH4 Conversion over Ce-Zr Solid Solution Supported Nano Pt-Ni Bimetal Catalysts: Preparation and Characterization of Ce-Zr Solid Solution
Authors: Yang Min , Dang Qiong , Li Yan Sheng , Xie Zhi Min , Guo Hai Jun
Published: November 2010

The Ce-Zr solid solution was prepared by co-precipitation method and ion exchange resin method. The properties of samples were characterized by XRD and SEM. Both the preparation methods can generate solid solution, and the particle size in the sample prepared by ion exchange resin is better than another when Ce-Zr solution formed. Besides, the effect of calcined temperature and feeding order on the formation of solid solution was discussed.
Effects of RE on the Microstructure and Mechanical Properties of Electrodeposited Copper Foil
Authors: He Tian , Yi Guang Bin , Cai Fen Min , Peng Wen Yi , Yang Xiang Jie
Published: November 2010

Electrodeposited copper foil was prepared by direct current electrodeposited method. Effects of different RE additions including 0, 3mg/L, 6mg/L and 9mg/L on the morphology, roughness, and mechanical properties of electrodeposited copper foil are investigated at high current density and high flow rate by SEM (scanning electron microscope), roughness measuring instrument, microcomputer control electronic universal testing machine and high temperature drawing machine. The results reveal that with increasing in RE content, the grain size in the copper foil is refined with more homogeneous distribution and denser, mechanical properties can be improved also. The desirable grain size in the copper foil with maximum value of the mechanical properties and the roughness can be obtained with approximately 6 mg/L RE content.
Preparation of Cobalt and Copper Superfine Composite Oxides and Magnetic Property
Authors: Zhang Wei , Zhang Chao Ping , Shen De Jun
Published: November 2010

A series of Co–Cu composite oxides with different susceptibility were prepared by a microemulsion method. XRD, TEM, EDS，FT-IR spectra , TG-DSC and magnetic balance were used to characterize the structure , thermostability and susceptibility of the composite oxides. The results indicate that sintering temperature has an apparent effect on the formation of the spinel structure, As the composite powders are annealed at 500 °C,the Co–Cu composite oxide was CuO 、CoO、 Cu2CoO3 and Co3O4 , but the susceptibilities of Co-Cu composite were found decreased with the annealing, and particle sizes of the composite oxides were increased in the beginning, and then became lower with the annealing .The element Co is found when the calcinations temperature is lower than 300°C.particle sizes of the composite oxides were increased at beginning, then reduced, and increased when over 500°C
Structure, Electrical and Optical Properties of Ni-Doped Cu3N Films Deposited by Radio Frequency Magnetron Sputtering
Authors: Wang Jun , Chen Jiang Tao , Zhang Guang An
Published: November 2010

Ni-doped Cu3N films were prepared by radio frequency (RF) reactive magnetron sputtering method under different N2/(N2+Ar) ratios at room temperature. X-ray diffraction (XRD) patterns show that Ni-doped Cu3N films have the preferred growth along the (100) plane. The lattice parameters of Ni-doped Cu3N films increases obviously compared with the pure Cu3N films, which indicate that some Ni atoms are incorporated into the Cu3N host lattice. The electrical resistivity of Ni-doped Cu3N films has a remarkable change and decreases as the nitrogen ratio decreases. The optical energy gap of Ni-doped Cu3N film is around 1 eV which has no obvious change. The morphology and the thermal stability of doped Cu3N films were also studied.
Application Study of Nanoparticle-Enhanced Phase Change Material in Ceiling Board
Authors: Guo Cha Xiu
Published: November 2010

The application of phase change materials (PCMs) is very promising in buildings because it allows the storage and discharge of considerable quantities of cooling and heating energy, dumping the air temperature swings within the building so that the indoor air temperature is closer to the desired temperature for a longer period of time. In order to account for the good characteristics of Alumina nanoparticle-in-paraffin as phase change material, based on enthalpy-porosity model and numerical analysis, detailed phase fields and heat flux are obtained, compared with that of pure paraffin. And study demonstrates that room with ENPCM ceiling is a good way of saving cool energy in summer.
Ultimate Strength Analysis of Ship Hulls of Continuous Basalt Fiber Composite Materials
Authors: Zhang Wei , Tang Wen Yong , Pu Ying Chao , Zhang Sheng Kun
Published: November 2010

Based on effective composite material failure criteria and property limited degradation model, axial compressive ultimate strength of composite laminated stiffened panels are analyzed by nonlinear laminated degenerated 3D finite element analysis, which is based on incremental continuum-based updated Lagrangian formulation. Comparison between analytical solutions and test results in this article indicates that this article provides an effective and practical method to evaluate the axial compressive ultimate strength of composite laminated stiffened panels. Using this method, ultimate strength of hull girders made of continuous basalt fiber composite materials are analyzed . Comparing the results，it can be seen that the ship hull in basalt fiber composite materials has equivalent longitudinal ultimate strength to S-2 glass fiber composite materials, basalt fiber composite material could replace the S-2 glass fiber composite materials used in shipbuilding engineering. The gist for building ship with basalt fiber composite materials was provided by this paper.
Influence of Different Sintering System on the Formation of Tricalcium Aluminate
Authors: Xiao Jun , Ma Bao Guo , Tan Hong Bo
Published: November 2010

Several different sintering systems about the formation of C3A ,by mixing CaO and Al2O3 powder, are studied in this experiment. The sample is characterized by glycerol ethanol method, X-ray powder diffraction and TG-DTA. The experimental results show that: reducing the react time cannot boost the formation of C3A, but traditionally electrical heating combined microwave heating can romote the formation of C3A rapidly .In terms of phase equilibria of CaO-Al2O3 system, pure C3A cann’t be synthesized by sintering . Except the samples also contain minor amounts of CA and C12A7.
Research on Impact Behavior of Reactive Powder Concrete
Authors: Zhao Qing Xin , Liu Zhao Yang , Zhang Jin Rui , Zhao Ran Ran
Published: November 2010

By means of the three-point bending impact equipment, with the measurement of ultrasonic velocity, the impact behavior and damage evolution of reactive powder concrete (RPC) with 0, 1%, 2% and 3% volume fraction of steel fiber were tested. The results showed that steel fiber significantly improved the compressive strength, flexural strength, flexural toughness and impact toughness of RPC matrix. The compressive strength, flexural strength, flexural toughness of RPC with 3% steel fiber increased by 40.1%, 102.1%, and 37.4 times than that of plain concrete, respectively, and simultaneously, the impact toughness of RPC with 3% steel fiber was 93.2 times higher than that with 1% steel fiber. RPC with 2% and 3% steel fiber dosage both had relatively high compressive strength, flexural strength and flexural toughness; however, compared with the sample with 2% steel fiber dosage, the impact toughness of RPC with 3% steel fiber dosage increased by more than 10 times. Therefore, taking economy and applicability into consideration, if we mainly emphasis on the compressive strength, flexural strength and flexural toughness, RPC with 2% steel fiber is optimal. While if impact toughness is critical, RPC with 3% steel fiber would be the best choice.
Experimental Study on Salt Solution Ingress into Concrete under Capillary Siphon Effect
Authors: Ma Kun Lin , Xie You Jun , Long Guang Cheng , Huang Jian
Published: November 2010

Salt solution ingress into concrete will result in serious deterioration of concrete materials, and then bring concrete structure in danger. So researchers pay more attention to the transportation of salt solution in concrete. In this paper, the ingress of 5% NaCl, 5%Na2SO4 and H2O into concrete under capillary siphon effect were investigated, and the influence factors such as water to binder ratio, mineral admixture, porosity and pore structure were also analyzed by methods of capillary solution-absorption experiment and evaporated water test. Results show that in capillary siphon effect, first the salt solution ingress into concrete increase quickly in very short time and then with the increase of time the solution absorption mass keep stable gradually. The types of salt solution are not the decisive factors controlling the solution ingress. Addition proper mineral admixture such as compound of fly ash (FA) and silica fume (SF) can decrease solution absorption mass under capillary siphon effect efficiently. In capillary effect, pores with aperture above 30 nm have close relativity with solution absorption mass. The decrease of porosity and improvement of pore structure can reduce the ingress of solution into concrete.
Manufacturing and Mechanical Responses of Ti/APC-2 Nanocomposite Cross-Ply and Quasi-Isotropic Laminates at Elevated Temperature
Authors: Jen Ming Hwa , Chang Che Kai , Sung Yi Chun , Hsu Feng Chi
Published: November 2010

Both Ti/APC-2 cross-ply and quasi-isotropic nanocomposite laminates were successfully fabricated. Basically, the tensile tests at elevated temperature were conducted to obtain the baseline data of mechanical properties, such as strength and stiffness. The results for both types of laminates of longitudinal stiffness predicted by the rule of mixtures (ROM) were in good agreement with experimental data, whilst, those ultimate strength predicted by ROM were lower than the measured data. Then, the tension-tension (T-T) constant stress amplitude cyclic tests were performed at elevated temperature to receive the S-N curves, fatigue strength and life. It is a surprise that almost no delaminations were observed in tensile and cyclic tests, even at elevated temperature and over a million cycles.
Stability and Ageing of Plasma Treated Wood/Polyethylene Composites Surfaces
Authors: Di Ming Wei , Liu Yang
Published: November 2010

Wood/Polyethylene (PE) composites were modified by air glow discharge plasma. The modified composites surface were characterized by contact angle measurements, attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that the surface wettability was improved, -OH, C-O and C=O bond were introduced on the surface, the oxygen element content increased and the shear bonding strength increased after plasma treatment. However, in the period of aging, the modified surface was unstable and exhibited a hydrophobic recovery, meanwhile the oxygen-containing functional groups reduced, O/C ratio increased and the shear bonding strength decreased gradually.
Rheological Properties of PTT/POE/OMMT Composites
Authors: Run Ming Tao , Guo Li Jie , Zhang Qing Chang , Zhong Yu , Han Qing , Hao Yan Ping
Published: November 2010

Poly(ethylene-octene)(POE) and organic montmorillonite(OMMT) acting respectively as the toughening agents and reinforcing agents, were used to prepare nanocomposites with Poly(trimethylene terephthalate)(PTT) in order to modify PTT, and the rheological properties of these composites were investigated by using capillary rheometer instrument. The OMMT used in composite was prepared by intercalating triphenyl phosphate (TPP) into MMT by mixed solution method. PTT/POE/OMMT nanocomposites were prepared by melt blending in twin-screw corotating extruder. Rheological results show that PTT/POE/OMMT composite melt was pseudo-plastic liquid and the pseudo-plasticity of the melt was decreased with increasing OMMT content for the strong interface interactions between OMMT and polymer molecular chains. The melt apparent viscosity was increased with increasing OMMT content. The flow activation energy results suggested that the composite melt having more OMMT components is more sensitive to the change of temperature.
Wear Behavior of Fe-Based Coating Fabricated by Plasma Thermal Spraying
Authors: Jiang Chao Ping , Pei Jian Zhong , Hao Jian Min
Published: November 2010

The Fe-based amorphous coatings were prepared by Air plasma thermal spraying. X-ray diffraction results show that the coating fabricated at current of 300A has an amorphous structure. The amorphous nanocrystalline composite coatings were obtained at current more than 300A. The friction and wear properties of the coatings were investigated in Ml-10 friction and wear tester at dry friction condition. The results show that the amorphous content is the main influencing factors to wear resistance of coating. The density of coating is another reason to affect the wear resistance of amorphous nanocrystalline composite coating.
Utilization of CFB Fly Ash in Eco-Cement: Mechanical Properties and Microstructural Analysis
Authors: Liu Xiao Ming , Li Yu , Zhang Ling Ling , Cang Da Qing
Published: November 2010

The disposal of circulating fluidized bed (CFB) fly ash has been a serious environmental problem in the development of our society. In this work, the feasibility of recycling CFB fly ash as a blended material incorporating blast furnace slag (BFS), clinker and gypsum for the preparation of Eco-cement has been investigated. The mechanical properties of CFB fly ash based Eco-cements, including CFB fly ash–clinker system, CFB fly ash–ground BFS system, and CFB fly ash–ground BFS–clinker system, were evaluated in this paper. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used to analyze the microstructural changes and the hydration products of the CFB fly ash based Eco-cement pastes. The results indicated that it is feasible to use CFB fly ash along with BFS and clinker to produce Eco-cement. The hydration products of CFB fly ash based Eco-cement are mostly ettringite and amorphous C-S-H gel, which are principally responsible for the strength and structure development of CFB fly ash based Eco-cement in the hydration process.
Experimental Study on Dynamic Collision Characteristics of Concrete
Authors: Ma Qin Wei , Yun Li Ning , Ma Shao Peng , Wang Hong Tao
Published: November 2010

An experimental study on collision dynamics characteristics of big concrete block is presented. In order to obtain the recovery coefficient and contact time, a special measuring system is constructed. The experimental results show that the recovery coefficient is increased with the rise of collision velocity but the variation of contact time with collision velocity is opposite. Meanwhile the recovery coefficient of high level concrete is also larger than that of the low level. The inner damage of material in the collision recorded by AE sensors is measured and the results indicated it was the main reason that leads to the energy loss.
Mathematical Model for Temperature Distributions of Work Roll in Aluminum Strip Cold Rolling
Authors: Gao De Dong , Wang Shan
Published: November 2010

The temperature distribution of the work roll affects the shape and size of final product in aluminum strip cold rolling process. The segmental model is presented to explore the boundaries of the roll. The surface of the work roll is divided into 5 different regions including the outlet roll-strip contact region, the inlet roll-strip contact (bite) region, the roll-spray region, the roll-air region and the roll-roll contact region. Based on the analysis of the roll pressure, the mathematical models of the plastic doformation work and friction heat are proposed to calculate the temperature variation in bite region. The boundaries, including heat convection with lubricant/air and heat conduction with the backup roll, are considered to model the work roll’s temperature distribution.
Tribological Behavior of La2O3 Particulate Reinforced Copper Matrix Composites
Authors: Zheng Run Guo , Zhan Zai Ji , Liang Bo , Wang Wen Kui
Published: November 2010

Copper matrix composites with different La2O3 content were fabricated by powder metallurgy method. Sliding wear behavior of the Cu-La2O3 composites was carried out by using a pin-on-disk wear tester under dry sliding conditions at a constant sliding speed of 20 m/s. The results showed that the wear rate of the composites was significantly lower than that of pure copper. The friction coefficient and wear rate of Cu matrix composites decreased significantly by incorporation of La2O3 particles. For determination of the wear mechanisms of the composites, the worn surfaces were examined using scanning electron microscopy. It is found that the main wear mechanisms of the sintered copper-La2O3 composites were oxidation wear and adhesive wear.
2D FE Modeling of Cracked Aluminum Plates Repaired with Adhesively Bonded Composite Patches
Authors: Yang Xiao Hua , Zhang Ding , Zhang Yong
Published: November 2010

A 2D FE model of cracked aluminum plates repaired with adhesively bonded composite patches was established in this paper, and then the model was validated by comparing the calculated SIF and fatigue life of repaired structure with existing results. The result shows that the model is accurate enough to be used to analyze the mechanical property of cracked aluminum plates repaired with adhesively bonded composite patches.
The Preparation of ZnO Gas-Sensing Material by Nucleation-Crystallization Separation Method
Authors: Ge Xiu Tao , Wang Jun Hai , Wang Ding , Xu Jia Qiang
Published: November 2010

The ZnO nanoparticles were synthesized by Nucleation-Crystallization Separation and co-precipitation. The structures and formed phase temperature of the samples were researched by X-ray diffraction (XRD) and DSC -TGA. Gas sensing properties of the samples were measured by a stationary state gas distribution method under static state. The results show that the ZnO prepared from Nucleation-Crystallization Separation has a higher response to 50 ppm ethanol and gasoline than ZnO prepared from co-precipitation. The sensitivity of ZnO prepared from Nucleation-Crystallization Separation to 50 ppm ethanol and gasoline are 34 and 68, which is better than the sensitivity of ZnO prepared from co-precipitation (17 and 28). The good sensing property may be due to the independence of nucleation and crystallization steps, which helps the more uniformity and thermal stability and the larger space utilization of ZnO particles.
Hydrogen Production by Hydrolyzing Zn Nano-Particles in a Cyclone Reactor
Authors: Xu Bo , Wang Shu Lin , Li Sheng Juan , Li Lai Qiang
Published: November 2010

A new experimental system is presented to make hydrogen by hydrolyzing Zn nano-particles in a cyclone reactor, in which the chemical reaction and gas-solid separation are carried out simultaneously. The gas-solid form a three-dimensional, turbulent flow-field induced by strong revolving force. The turbulent moving improves the efficiency of heat and mass transfer, which is favorable to chemical reaction. And the Zn nano-particles of 10-20nm preheated at about 523K can react with water steam rapidly. XRD and TEM analysis shows that the solid product consists of ZnO and Zn and has a blended morphology of nano-rods and nano-flakes. The gas-solid separation efficiency primarily depends on the inlet velocity when the particle size distribution is determined, and the particle resident time in the reactor has close relation to Reynolds number of gas inlet. It is confirmed that the steam inlet velocity of 10m/s and Ar inlet velocity of 5m/s are favorable.