bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Filler Metal on the Microstructures and Properties of 2519A/7A52 Weld Joint
Authors: Hu Zhong Ju , Huang Hao , Zhou Hong Gang
Published: December 2012

2519A/7A52 aluminum alloys were welded by using ER4043 and ER2319 welding wires with the method of MIG. The mechanical properties, microstructures as well as fracture of welded joints were studied. The results show that the welding wire of ER2319 is favorable for grain refinement of welding structures, and the strength and elongation of the joint are better than that welded by ER4043 welding wire. While for the use of ER4043, the strength and ductility of joint decline due to the generation of Si-rich brittle phase, and the fracture of weldment is mostly brittle type.
Features of Meso-Deformation and Failure of Aluminum Foam under Impact
Authors: Yang Bao , Tang Li Qun , Liu Yi Ping , Liu Ze Jia , Jiang Zhen Yu
Published: December 2012

Deformation and failure of meso-structures take great effect on the loading and energy absorption of aluminum foam under impact. We designed a split Hopkinson pressure bar (SHPB)-high speed digital camera system to monitor the meso-deformation and failure features, and measure the nonuniformity of deformation of aluminum foam under impact. The meso-deformation and failure of aluminum foam were observed successfully by the system, and it showed that there does exist remarkable nonuniform deformation along the specimen. In order to expand the experimental results, the specimen of aluminum foam with meso-structures is modeled by 3D Voronoi technique. The numerical results show that the FE model can simulate the experiment well, and shows that nonuniformity of deformation appears in aluminum foam specimen significantly. The analysis indicates that the assumption of uniform deformation of specimen in SHPB cannot be strictly satisfied for the material of aluminum foam.
Elastic-Plastic Analysis and Failure Assessment of the Pipeline Steel with Surface Crack
Authors: Wang Zhong Xian , Zhang Rui Feng
Published: December 2012

A detailed elastic-plastic analysis on different semi-elliptical surface crack geometries under uniaxial and biaxial load was conducted using 3D ﬁnite element analysis for pipeline steel X100. After quantitating fracture driving force J-integral and plastic yielding load, the effects of biaxial load and crack geometry were investigated by using the Option 3 of R6 failure assessment diagram approach for the surface cracks with the different crack sizes ( aspect ratios c/a = 1, 1.5 and 3 ) and the various biaxial loading ratios λ from -1 to 2. And three option curves of the R6 assessment were compared to evaluate the applicability of R6 assessment method for the X100 steel.
An Optimization Approach for 25um Pitch Microbolometers
Authors: Zhou Hong Xi , Chen Chao , Wang Tao
Published: December 2012

In this paper a high-performance single level uncooled microbolometer detectors with a unit cell size of 25um×25um is introduced. An efficient detectors requires low Noise Equivalent Temperature Difference(NETD) (<80mK,f/1,60Hz)and low thermal time constant (<8.3ms). The trade-offs between physical parameters are studied to attain the optimum design parameters including the thermal conductance, the thermal time constant and the active area, consequently, optimum design parameters such as the width and the length of the support arms, which can satisfy the demand of an efficient detectors is achieved.
Grey Clustering Model of Coating Erosion Resistance Evaluation
Authors: Chen Bao Ping
Published: December 2012

The erosion resistance evaluation of coating has important academic significance as well as project application value. Being the traditional way, the direct comparison method requires large amount of trivial work. By taking different coatings as clustering objects and data obtained from coating in erosion experiments as clustering index, this paper, on the other hand, defines the whitenization weight function of the index with grey clustering method, and has in this way built the grey clustering mathematical model of coating erosion resistance evaluation. As is proved in practice that the model makes it possible to evaluate the erosion resistance of coating scientifically, making the evaluation more reasonable and objective. At the same time, due to the accurate evaluation results, it avoids the subjectivity and one-sidedness otherwise being unavoidable for judging by experience. The coating erosion resistance experiments do not have strict demands for data volume, which makes the evaluation process both simple and scientific.
Numerical Analysis on the Butt-Joint under Izod Impact Test
Authors: Zheng Xiao Ling , Wu Ling , You Min , Liu Kai , Li Mei
Published: December 2012

The effect of the adhesive thickness on the impact toughness of the adhesively bonded steel butt joint during Izod impact test and the failure procedure is studied using the finite element method software ABAQUS. The results obtained show that the time with the peak stress Seqv occurred is corresponding to the element failure. And much higher peak stress might be subjected by the element near the bottom of the joint under impact load. The failure time of the element becomes little longer when the adhesive layer thickness increased from 0.1 mm to 0.4 mm. But the peak value of the Seqv decreases and the damage limit of the strain increased evidently as the adhesive thickness increased from 0.2 mm to 0.4 mm.
Size and Interface Coherency Dependent Phase Transformation of Niobium Nanoparticles Embedded in Copper Matrix by Mechanical Alloying
Authors: Lei Ruo Shan , Xu Shi Qing , Wang Ming Pu , Li Ye Jun , Qi Wei Hong
Published: December 2012

The object of this work is to investigate the interface and size effects on the structural phase transition of Nb nanoparticles (NPs) embedded in Cu matrix. By means of X-ray diffraction analysis and high-resolution transmission electron microscopy observation, it is found that higher coherency of the Cu/Nb interface benefits the occurrence of phase transition in Nb NPs with larger sizes. The sufficient conditions for the transition are: (1) the size of Nb NPs should be smaller than 8 nm; (2) the Cu/Nb interfaces should be semi-coherent or coherent. The experimental results are consistent with the predictions of Bond Energy model.
Effects of Doped AE (Ca, Sr) on Synthesis and Structure of Lanthanum Chromite-Based Nano-Powder
Authors: Zhu Xin De , Li Sheng Li , Zhang Jian Hua , Ao Qing
Published: December 2012

Using sol-gel method, a series of nanocrystalline materials La1-xAExCrO3(AE=Ca, Sr) were synthesized. Difference between Ca- and Sr-doped lanthanum chromites were investigated by carrying out differential scanning calorimetry (DSC), thermogravimetric analysis (TG), X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM). It was found that the synthesis temperature (1-xCaxCrO3, and CaCrO4as the second phase (x≥0.2) at the room temperature. LSC is composed of single orthorhombic perovskite phase for x=0.1, while the orthorhombic and rhombohedral perovskite phases coexist for x=0.2, and only rhombohedral perovskite phase for x=0.3. Further studies showed that the maximum solubility of Sr was lower than that of Ca in lanthanum chromite.
Preparation of the Silica Micro-Spheres by Chemical Precipitation Process
Authors: Wen Bin , Huo Chun Qing , Li Cong Hao , Zhang Long
Published: December 2012

Silica micro-spheres were prepared from sodium silicate at room temperature with ethyl acetate as the precipitant. The effect of process parameters on the yield and the morphology of SiO2 powders was systematically investigated and the optimum reaction condition was confirmed as follows: the concentration of sodium silicate was 0.6 mol/L, the total addition amount of the blend surfactants of PEG-1000 and sodium dodecyl benzene sulfonate (SDBS) was 2.1% and the blend ratio was 20:1, the addition amount of ethanol and ethyl acetate were 5.0% and 8.0%, respectively, the stirring rate was 600 rpm and the reaction time was 4.0 hours. The average particle size was 400 nm and the yield was 93.8% .The product was characterized by scanning electron microscope, Infrared Spectroscopy, and X-ray powder diffraction.
Application of Nano-Materials in Sports Engineering
Authors: Song Zhi Qiang , Cai Yun Tao
Published: December 2012

Nanotechnology is a multidisciplinary and comprehensive frontier field. With the coming of the nano era, nanotechnology will have far-reaching impact of human life. It will also offer opportunities for the application of nano-materials in the field of sports engineering which promotes the leap-development of sports. Today, the nanometer materials have been widely used in the construction of sports venues, sports equipment, sport apparels and sport biology project and so on, the relevant departments should attach great importance to the development and research of nanometer materials in sports engineering from the height of strategy, seizing the opportunity and promoting the fast, healthy development of sports.
Effects of Retained Austenite Stability on Mechanical Properties of High Strength TRIP Steel
Authors: Li Zhi Feng , Fu Ren Yu , Li Qing Shan
Published: December 2012

Mechanical stability of retained austenite and its effect on mechanical properties of high strength TRIP steel were studied by means of OM, SEM, TEM, XRD, and mechanical testing after various heat treatments. Results revealed that the film-type retained austenite located between bainite laths with high carbon content showed gradual martensitic transformation with strain, demonstrating a good TRIP effect. Samples annealed at 800°C and held at 420°C showed an optimum value of strength and ductility product up to 18381.2MPa%. Transformation kinetics of the retained austenite were evaluated through tensile tests and fitted by the function y=0.86-0.86×exp(-Ax). The fitting results were good.
Effect of Tempering Temperature on Microstructure and Properties of Cold Deformed Low Carbon Bainitic Steel
Authors: Liu Zhi Xue , Cheng Ju Qiang
Published: December 2012

In order to research the cold deformation work hardening characteristic of new type low carbon bainitic steel, this article studies the effect of different degrees of cold deformation (elongation and compression) and different tempering temperatures on microstructure and mechanical properties of 15SiMn2Mo low carbon beinaitic steel. The results showed that with the tempering temperature increasing after 10% pre-tension deformation, the tensile strength and yield strength of the test material increased first and then decreased, and reached its peak value at 300°C, roughly the same as the strength of hot-rolling and 300°C tempering. With the compression deformation degree rising, the hardness of test material increased and showed the test material has good work hardening performance. Streamline and "z" shape ferrite banding appeared in microstructure. With the tempering temperature increasing, the microstructure of compressed deformation steel recoveried and recrystallized, the tendency of ferrite along the streamline was weakened, the new refining granular phase was enhanced and uniformity of microstructure was improved. The microstructure refinement was significantly increased with the compressive deformation degree rising.
Relationships between Fatigue Mechanical Properties and Roughness of Fatigue Fracture about 16MnR Steel after High Temperature
Authors: Liu An Zhong , Zhang Su
Published: December 2012

The microstructure of metal material would change with temperature, the roughness of the metal fracture would also vary. The mechanical properties of materials closely related to roughness of fracture. In this paper, after high temperature the crack strain fatigue fracture roughness and fatigue mechanical properties were analyzed for 16MnR steel. Further, relationships between roughness of fatigue fracture and temperature were also discussed.
Effects of Quenching Medium on the Microstructures and Mechanical Properties of 42CrMo Steel
Authors: Chen Jun Dan , Lu Shan Ping
Published: December 2012

The effect of quenching medium on the microstructure and mechanical properties has been investigated for the 42CrMo steel, which is used in a polar crane for the nuclear power station. Experimental results indicates that the microstructure of the air quenched 42CrMo steel is pearlite , proeutectoid ferrite and a small amount of upper bainite. The microstructure of 42CrMo after oil quenching is lower bainite and martensite, and changed to martensite and a small amount of lower bainite after water quenching. The Charpy impact energy at -12°C of the air ,oil and water quenched samples after 560°C tempering is 12J, 22J and 59J, respectively. The decrease of proeutectoid ferrite significantly improves the Charpy impact energy of the investigated steel. The strength and impact property of 42CrMo under water quenching together with 560°C tempering can meet the requirements of the wheel and level wheel for the polar crane.
FEM Modeling and Validation of the Temperature Field in the Plasma Arc Bending of Laminated Clad Metal Sheets
Authors: Song Wen Qing , Chai Jing Fu , Xu Wen Ji
Published: December 2012

Plasma arc bending of laminated clad metal sheets (LCMS) is a newly developed technique that produces deformation in the LCMS by thermal stress instead of external mechanical force. Since the temperature field leads to the thermal stress, a FEM mode was developed to study the temperature variations in the plasma arc bending of the LCMS which was validated robustness by the experiments. The results show that the temperature variations of the LCMS include the preheating, temperature dramatically changing and cooling stages. The lowest temperature is in the inlet whereas the highest temperature is in the outlet along the heating line. It needs to regulate the energy input of the plasma arc to avoid the possible partial melting of the LCMS.
Effect of Nano-Nd2O3 on Sintering and Crystallization of Fused Quartz Ceramic Materials
Authors: Gu Ying Lei , Bu Jing Long , Yu Li Xue , Chen Jun Xing , Wang Zhi Fa
Published: December 2012

Fused quartz powder (d50=19μm) was used as raw material, and nano-Nd2O3 was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. The effects of nano-Nd2O3 on crystallization and sintering behavior of the materials at various temperatures (1300 °C/1h, 1350 °C /1h and 1400°C /1h) were studied by measurements of apparent porosity, bending strength and thermal expansion ratios (RT~1200°C), and analyses of XRD and SEM. The results of XRD and thermal expansion ratios analysis showed that 3% nano-Nd2O3 additive had excellent effect on inhibiting crystallization of the samples sintered at 1350 °C and 1400°C. The results showed that the samples sintered at various temperatures with 3% nano-Nd2O3 had the lowest apparent porosity and more compact microstructure. This indicated that 3% nano-Nd2O3 had better effect on facilitating sintering of fused quartz materials.
Effect of Pressure of Nitrogen Atmosphere on Microstructure and Mechanical Properties of Ti(C, N)–12WC–16Ni–4Mo2C Cermet
Authors: Zheng Teng Biao , Feng Ping , Lei Hai Yan
Published: December 2012

The effect of sintering atmosphere and nitrogen pressure on microstructure of Ti(C, N)–12WC–16Ni–4Mo2C cermet were investigated by scanning electron microscopy (SEM) and optical microscopy (OM), the transverse rupture strength (TRS), porosities, volume fractions of phases and grain sizes were determined. Results show that nitrogen pressure has a significant impact on TRS, appropriate nitrogen pressure could improve TRS. Vacuum sintering promotes the densification of sintered body, however, nitrogen atmosphere sintering could gain maximal TRS. Nitrogen atmosphere sintering facilitates the formation of inner rim phase and reduces the dissolution of TiC and TiN, small grain size is gained.
Numerical Simulation of Failure Process of VITA All-Ceramic Crowns
Authors: Fan Cheng , Chen Geng , Wang Shan Shan
Published: December 2012

Ceramic materials has approximate color and translucency with natural tooth, which is unmatched by other restorative materials. Because of its beautiful appearance, good physical and chemical properties, all-ceramic crown restorations are more widely used. However, due to the brittleness of ceramics and the stress mismatch between different materials, failure phenomenon is often observed during the service period of all-ceramic crowns. The failure process and mechanism are not clear, in this paper, the force performance of all-ceramic crowns is analyzed using the RFPA (realistic failure process analysis) system. The crack initiation, propagation and failure process of all-ceramic crown can be clearly observed and the research results provide guidance for clinical application.
Evaluation of the Protection Effect on Copper with Different Sacrificial Anodes
Authors: Wang Chong Bi , Kong Xiao Dong , Tian Zhi Qiang
Published: December 2012

Sacrificial anodes performance of three iron alloys was measured by constant current test, The protection effects of iron alloys, zinc alloy and aluminum alloy sacrificial anodes on copper tube were compared and analysed by polarization test. The results show that all three iron alloys appearing well sacrificial anodes performance, with steady working potential, high practical electric capacity and current efficiency, the corrosion is uniform and the corrosion products fall easily. Iron alloys are more suitable for application on the cathodic protection of copper tube due to their more suitable driving voltage and coulpling current compared with zinc alloy and aluminum alloy.
The Study of Properties of Cu-0.8Cr-0.2Zr Alloy Used as Contact Materials
Authors: Hao Liu Cheng , Han Li Juan , Li Ya Fei , Li Bao Zeng , Wang Lu Ping , Zhang Quan Min
Published: December 2012

Although alloy QCr0.5 has been used as the contact materials in the high-voltage equipment extensively, but it always confronts the awkwardness of over aging in the heat treatment, and results in brittleness during the switching on and breaking process. In the present work by the technology of interalloy-adding, the Zr-containing alloy Cu-0.8Cr-0.2Zr has been prepared and investigated. The results of the microstructure and properties indicate that the alloy matrix maintains FCC microstructure and lots of Zr-containing precipitation is dispersed in the matrix uniformly. The brinell hardness, the ultimate tensile strength and the elastic modulus increase greatly, reach 140 MPa, 430 Mpa and 130 GPa respectively, meanwhile the electric conductivity maintains 75%IACS and the softening temperature is up to 550 °C.
Microstructure and Mechanical Properties of Eco-2024-T3 Aluminum Alloy
Authors: Kim Seon Ho , Kim Kyu Sik , Kim Shae K. , Yoon Young Ok , Cho Kyu Sang , Lee Kee Ahn
Published: December 2012

In this study, the microstructures and mechanical properties of the recently developed Eco-2024-T3 alloy were examined. Eco-2024 is made using Eco-Mg (Mg-Al2Ca) in place of element Mg during the manufacture of alloy 2024-T3. This is an alloy that has economic advantage and excellent properties. Alloy Eco-2024 showed smaller crystal grains that were distributed more evenly compared to the existing alloy 2024-T3. It consisted of Al matrices containing minute amounts of Al2CuMg, Al2Cu, and Ca phases and showed microstructures with reduced amounts of Fe phases or oxide. As a result of tensile tests, this alloy exhibited yield strength of 413 MPa, tensile strength of 527 MPa, and elongation of 15.4%. In other words, it showed higher strength than the existing alloy 2024 but was similar to the existing alloy 2024 in terms of elongation. In fatigue tests, alloy Eco-2024-T3 recorded fatigue limit of 330 MPa or around 80% of its yield strength; this is a much more excellent property compared to the existing alloy 2024-T3, which has fatigue limit of 250 MPa. Based on the aforementioned results, the correlation between the excellent mechanical properties of alloy Eco-2024-T3 and its microstructure was examined.
DFT Study on Clusters Ni4-xFexP (x=0~4): A Theoretical Investigation on the Property of Amorphous Alloy Ni80-xFexP20
Authors: Fang Zhi Gang , Ban Hong Yan , Gao Yun , Gu Ting Ting
Published: December 2012

More than a hundred models of clusters Ni4-xFexP (x=0~4) have been designed and computed in duplicate and fourfold state on density function theory (DFT) to simulate amorphous alloys Ni80-xFexP20 that were the most familiar proportions in Ni-Fe-P amorphous system. The geometry, energy, electronic and catalytic properties have been discussed. The results disclosed that clusters could reflect some characteristic properties of binary amorphous alloys. And the clusters could predict the geometry and electron properties of corresponding ternary amorphous alloys. The addition of third element could enhance the system stability of Ni-P amorphous alloys. The metal atoms are the electrons gainers and metalloid atoms are the electrons offers in the clusters, and the ability of gaining electrons of atoms Ni is better than the one of atoms Fe. The trend of cluster Ni2Fe2P forming may be the keenest in clusters. It also would offer more excellent catalytic activity basing on Fermi level and density of state.
Preparation of Cu-Coated Diamond Particles and its Influence on the Performances of Diamond/Cu Composites
Authors: Zhang Yu Jun , Cai Hua Chun , Shen Zhuo Shen
Published: December 2012

Cu-coated diamond particles in variable mass ratio of diamond and Cu are prepared by electroless plating process, then the coated particles are sintered by Spark Plasma Sintering (SPS) respectively. Diamond/Cu composites with high content of diamond(70vol%) are obtained eventually. The results indicate that not only coating diamond by copper electroless plating process could be used to obtain well-dispersed Diamond/Cu composites, but also effectively to improve the relative density of the sintered body, the relative density of the sintered body at 70vol% content of diamond is about 97.5%, as well as to obtain the composite with higher thermal conductivity. Thermal conductivity of the 70vol% Diamond-Cu composite reaches as high as 404 W/(m•K).
Synthesis and Characterization of a New Kind of UV-Curable Cyclohexanone-Formaldehyde Resins
Authors: Yang Guang , Zeng Xin Rong , Wang Yi , Zhang Yi Fu
Published: December 2012

A kind of UV-curable cyclohexanone-formaldehyde resins (UVCF) was prepared by the reaction of cyclohexanone-formaldehyde resin (CFR), isophorone diisocyanate (IPDI) and 2-hydroxyethyl acrylate (HEA). The UVCFIPID-HEA obtained was characterized by fourier transform infrared spectrum (FTIR), nuclear magnetic resonance (NMR). The FTIR and 1H-NMR results show that the terminal acrylate acyloxy was introduced into the structure of the prepolymer. The results of solvent resistance tests show that the solvent resistance property of UVCFIPID-HEA is excellent.
Polyurethane Application in a Large-Scale LNG Tank
Authors: Cheng Huan Xin , Luo Xiao Ling
Published: December 2012

The paper states the type and structure of large-scale LNG tank, discusses polyurethane foam performances and its application in a large-scale LNG insulation structure and makes a preliminary exploration to LNG tank low temperature insulation technology of our country. The paper has some reference values for large-scale LNG tank design and research.
An Orthogonal Experiment of Bagasse Cellulose Dissolution in Ionic Liquid by Microwave Heating
Authors: Han Dong Hui , Wei Xiao Yi , Li Ji Hua , Chen Jia Cui , Cui Li Hong , Wang Yi Hong , Ou Chun Ying
Published: December 2012

In this paper, bagasse cellulose was dissolved in ionic liquid (1-butyl-3-methylimidazolium chloride) by microwave heating. The orthogonal test and variance analysis were applied to obtain the optimum dissolution condition of bagasse in ionic liquid. The effects of microwave power, temperature and the mass fraction of cellulose were examined by an orthogonal experiment designed through the different dissolution time and the yield of regeneration bagasse. Results showed that the optimal dissolution condition for faster dissolution time was 1% of bagasse cellulose in ionic liquid at 140°C, 500W; while, to get the most yield of cellulose, the condition was 2% of bagasse cellulose at 130°C, 500W.
Study on Layered Structure and Properties of PP/LLDPE Injection Molding
Authors: Li You Bing , Pan Yan , Shi Wen , Sheng Xu Ming , Dai Bing
Published: December 2012

The melt blending was used to prepare the PP/LLDPE blend, and the layered structure and properties for PP/LLDPE blends were detailed explored. The addition of LLDPE was beneficial to toughen the PP injection moldings. The impact strength also improved for addtion of LLDPE and the corresponding increase percentage in impact strength was 111% for PP/LLDEPE (65/35, w/w) comapred with pure PP. SEM showed the preferred orientation of lamella obtained in shear layer and core region. WAXD curves showed the peak of (300) β-form for PP component in the skin and core region was evident and nearly disappeared in the shear layer, and the (200) peak for LLDPE component in the skin was stronger than that in the shear layer and core region. The enthalpy value calculated by DSC data increased from the core region to the skin, which indicated the crystallinity for PP/LLDPE blends increased from the core region to the skin.
Study on Network of Epoxidized Natural Rubber with Different Epoxidation Degree: Measured by 1H-NMR
Authors: Gao Tian Ming , Huang Hong Hai , Li Pu Wang , Xu Kui , Huang Mao Fang
Published: December 2012

Network of epoxidized natural rubber that have different epoxidation degree(ED) were measured by 1H-NMR relaxation. Different epoxidation degree ENR showed different molecular mobility due to variations in crosslink density. The temperature dependence of T1, T2 has also been measured.
Effects of Bagasse Fiber on Crystallization, Morphological and Mechanical Properties of Poly(Lactic acid)
Authors: Cai Jun , Shi Nan , Dou Qiang
Published: December 2012

Polylactic acid (PLA)/bagasse fiber (BF) composites were prepared via melt blending. The melting and crystallization behavior, morphology and mechanical properties of the composites were studied by means of differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and mechanical tests. The results indicate that the crystallization ability of PLA is improved with the addition of BF. Silane treatment improves the adhesion between BF and the matrix. Compared with pure PLA, the flexural modulus increases, while the notched impact strength decreases for BF/PLA composites.
MD Simulation of Crosslinked Epoxy Resin at Different Temperatures
Authors: Zhang Miao , Yang Ping
Published: December 2012

Epoxy resin is widely used in many electronic packages, the ability to predict properties of cross linked epoxy resin before experiments will facilitate the process of materials design. Molecular dynamics (MD) is a powerful method that can simulate the materials at atomic scale and it can be used to predict the performance and properties of a wide range of materials. In this work, the properties of the cross-linked epoxy resin compound at high temperature were studies by MD simulations. The relations of the glass transition temperature (Tg) and properties of the cross-linked epoxy resin were investigated. The results show that Tg can be estimated by the plot of non-bond energy at different temperatures, and consist with the experimental data.
Investigation on Tensile Properties of Two Guide Bar Warp Knitted Fabric Reinforced Composites
Authors: Qin Zhi Gang , Shi Bao
Published: December 2012

The composite laminates are produced by manual molding technology using two guide bar warp knitted fabrics of glass fiber as reinforcement and epoxy resin as matrix. The tensile properties of composites in the course, wale and diagonal directions are tested on the universal material testing machine. The influences of warp knitting stitch structures for mechanical performance of the composites are discussed. The results show that the tensile stress/strain curves of two guide bar warp knitted fabric reinforced composites were nonlinear. The tensile properties of composites possess obvious anisotropic characteristics. The tensile strengths and modulus of the warp knitting fabric composites depend on the yarn numbers bearing load along tensile direction, which are related to the stitches and structural parameters of warp knitted fabrics.
Crystallization, Morphology and Mechanical Properties of PLA/PBAT/CaCO3 Composites
Authors: Shi Nan , Cai Jun , Dou Qiang
Published: December 2012

The melting, crystallization behavior, morphology and mechanical properties of poly(lactic acid) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT)/calcium carbonate (CaCO3) composites were investigated by means of differential scanning calorimetry (DSC), scanning electron microscopy(SEM), and mechanical test. It is shown that PBAT decreases the crystallinity, while CaCO3 increases the crystallinity of the composites. A synergistic toughening effect is obtained by the combination of CaCO3 and PBAT. The optimum mechanical properties can be achieved in case of the composite (PLA: PBAT: CaCO3=60: 20: 20).
Miscibility and Thermal Properties of Bacterial Poly(3-Hydroxybutyrate-co-3-hydroxyhexanoate)/Poly(Ethylene oxide) Blends
Authors: Ding Chang Kun , Cheng Bo Wen , Wu Qiong
Published: December 2012

The miscibility and thermal properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)/poly(ethylene oxide) blends were investigated by differential scanning calorimetry (DSC). The results indicated that PHBHHx showed complete miscibility with PEO for PHBHHx/PEO 95/5, 90/10 and 80/20 blends as evidenced by the single composition-dependent glass transition temperature and the depression of the melting temperature of PHBHHx. However, PHBHHx showed partial miscibility with PEO for the other three blends as shown by the existence of unchanged composition independent glass transition temperature. The incorporation of PEO may improve the performances of PHBHHx to meet the different need in biomedical applications.
Indomethacin Molecular Imprinted Polymer Preparation, Characterization of Application
Authors: Tan Zhi Dou
Published: December 2012

In order to indomethacin (IDM) for imprinting molecular, acrylamide (AA) as functional monomer, ethylene glycol dimethacrylate (EGDMA two) as crosslinking agent, respectively by photopolymerization and thermal polymerization of two methods of aqueous solution polymerization, suspension polymerization preparation of molecularly imprinted polymer.The polymer adsorption experiments show that the use of light-polymerized specificity is strong; light initiated polymer used for sample determination and calibration experiments, results in tap water and river water samples in Enshi Qingjiang indomethacin recoveries were 84.3% and 87.1%, were higher than 80%.Tap water and the relative standard deviation (n = 3) were 3.96%, 14.2%, that can be used for the separation and enrichment of indomethacin in water samples.
The Effect of Poly(Ethylene succinate) on Mechanical Property of PLLA/PES Composite in the In Vitro Degradation Process
Authors: Fan Xin , Chen Qi Yuan
Published: December 2012

Poly(L-lactide)/poly(ethylene succinate)(PLLA/PES) composites were prepared via melt-blending. The bending properties of PLLA/PES composites and PLLA materials were determined. And the effect of degradation time on mechanical properties of PLLA/PES composites and PLLA were too discussed. The results show that the degradation rate of PLLA/PES composites is faster than that of PLLA materials, especially after the degradation time of 12 weeks.
Study on Properties of Sulfonate Hyperbranched Polymer Surfactant
Authors: Wang Xue Chuan , Li Xin Miao , Qiang Tao Tao
Published: December 2012

A new type of sulfonate surfactant (Gn-SHBP) has been prepared by esterification and sulphonation. At 25°C, the surface activity, the effect of NaCl on solution CMC（critical micelle concentration), emulsibility and the tolerance to inorganic salts of sulfonate hyperbranched polymer surfactants were investigated by the methods of surface tension, measuring cylinder and visible-infrared spectrometer. The results show that both surfactants have high surface activity; G2-SHBP exhibit higher surface activity than G1-SHBP with a CMC of 0.2 g/L and a γCMC of 25.36 mN/m; and both perform good emulsify power which exhibit better emulsion stability than SDBS; and high resistance to inorganic salt which can reach up to 260 g/L ( NaCl), 140 g/L(CaCl2) and 190 g/L(MgCl2), respectively.
Elastomechanical Study of Magnetoeletric Coupling in Bilayer of Lithium Zinc Ferrite and Lead Zirconate Titanate
Authors: Cao Hong Xia , Zhang Chuang , Liu Qing Quan , Wang You Bao
Published: December 2012

A theoretical model based on the constitutive equations of piezoelectrics and magnetostrictor is introduced to discuss the magnetoelectric (ME) coupling in freebody bilayer containing magnetostrictive and piezoelectric phases. The ME coupling at low frequency of Ni0.8Zn0.2Fe2O4–PZT bilayer have been studied by using the model and the corresponding material parameters of individual phases. The results show that the ME voltage coefficients can increase to a maximum at a given volume fraction of piezoelectric phase. An approximately linear increase of the maximum has been obtained with strengthening interface coupling. Analysis shows that large magnetostriction, appropriate volume fraction and ideal interface coupling are key ingredients for obtaining excellent ME performance.
Luminescence Properties of Tm3+ /Dy3+ Co-Doped Zinc-Aluminum Phosphate Glasses for White LED
Authors: Lin C.T. , Yung S.W. , Lin J. , Chen W.S. , Lai C.H. , Lee Y.M. , Lin J.S.
Published: December 2012

Tm3+ and Dy3+ co-doped zinc-aluminum phosphate glasses were prepared in this study. Judd-Ofelt theory has been used to evaluate the three intensity parameters Ω2, Ω4 and Ω6 form the experimental oscillator strengths. The luminescence properties were investigated by excitation and emission spectra. White light emission could be induced by combined blue and yellow bands under UV excitation, and the variety of excitation wavelength could change the luminescence color.
Characteristics of Photonic Crystals on the Total Reflection Tunneling with Material Absorption
Authors: Peng Chang De , Liu Qi Neng , Peng Qi Wen , Liu Jin Song
Published: December 2012

This paper has introduced the concept of complex refractive index and studied the effects of material absorption on the total reflection tunneling characteristics of photonic crystals by employing the characteristic matrix method. Through numerical computation, changes of the total reflection tunneling peak of photonic crystals along with the extinction coefficient and periodical optical thickness of the materials have been studied. The peak height of the total reflection tunneling decreases with the increase of the extinction coefficient, while the frequency of the total reflection tunneling peak is free from the extinction coefficient. Moreover, the frequency and bandwidth of the total reflection tunneling decrease with the increase of the periodical optical thickness.
Research of Fiber Radar Absorbing Materials
Authors: Wei Sai Nan , Li Rui Zhou , Chen Li , Yao Ji Ming
Published: December 2012

Electromagnetic parameters and absorbing properties of fiber absorbents (carbon fiber, SiC fiber and polycrystalline iron fiber) were introduced. The influences of the arrangement, thickness and content of the fibers on radar absorbing property were summarized. New development directions of the fiber absorbents were also indicated.
Thermodynamic Study of Crystal Growth Behavior Based on Structural Analysis of Chemical Bonds
Authors: Zhang Xu , Xie Hua
Published: December 2012

Crystallization is a universal phenomenon in modern industry and has been developed into a core discipline. Investigation of the crystal formation has also increasingly become a vital subject in the field of materials science and technology. The crystal shape may be successfully varied by controlling its crystallization conditions, but there is far less understanding of how the crystal shape is modified. Thermodynamics of crystal growth behavior was developed to investigate the ideal shape of inorganic crystals on the basis of structural analysis of chemical bonds. The present work can help us to comprehend the crystal growth process and further guide the manipulation of crystal shape.
The Slagging Model Research of Refining-Slag for High Aluminum Steel
Authors: Zhang Min , Zeng Jian Hua , Yang Xing Di , Zeng Yao Xian
Published: December 2012

To accurately control the Si content and ensure the function of slag refining in high aluminum steel, the direction and limits of reduction reaction for SiO2 were analyzed based on the thermodynamics. In addition, the thermodynamic prediction model of multi-element slag was studied. Then, a slag activity prediction model was established based on the coexistence theory. Using the model, the suitable ladle slag composition for high aluminum steel was calculated.
The Composite Catalysts Used for Cotton Denim Resin Wrinkles Setting
Authors: Yao Ji Ming , Wei Sai Nan
Published: December 2012

Severe strength loss is the most important problem for denim wrinkle-setting resin finishing. N,N-dimethylol 4,5-dihydroxy- ethylene urea (DMDHEU) resin、composite catalyst, baking time and temperature were used as four important factors in experimental design by central lab. The significant influence and the optimum condition achieved by analysis four factors and regression analysis. In contrast to traditional catalyst magnesium chloride, under optimum condition employed by composite catalyst 20.61(g/L), resin 143.08(g/L), baked at 129.4°C for 18.0 min, the strength loss of treated fabric reduced by more than 12%.
Synthesis of Porous NiMo Sulphide Act as HDS Catalyst by Alcohol Supercritical Drying Technique
Authors: Li Ning , Chai Yong Ming , Yin Chang Long , Liu Chen Guang
Published: December 2012

Porous NiMo sulphide was successfully synthesized from ethanol supercritical fluid drying technique using (NH4)2MoS4and Ni(NO3)2as the precursors. It was shown that the NiMo sulphide had extremely high porosity and the specific surface area was 322 m2•g-1. The results of DBT hydrodesulfurization experimental showed that the porous NiMo sulfide prepared had high HDS activity, which was 2.78 times higher than that of a commercialized supported catalyst.
Analysis of Marking Glass with Different Process Parameters Based on Super-Pulsed Laser
Authors: Zhang Xin Ming , Ma Jing Qi , Ding Yun Feng
Published: December 2012

This document introduced the advantages of laser marking technology and the difficulty of marking glass surface. During used a laser marking machine which based on the latest super-pulsed CO2 laser and through marked texts on glass with three different ways, the results show the influence of different parameters in each marking method.
Evaluation of the Direct Tensile Behavioral Characteristics of UHPC Using Twisted Steel Fibers
Authors: Ryu Gum Sung , Kim Si Hwan , Ahn Gi Hong , Koh Kyung Taek
Published: December 2012

This paper investigates the improvement of the toughness of UHPC through the use of conventional straight steel fibers and twisted fibers. The conventional straight steel fiber has length of 13 mm and diameter of 0.2 mm. Besides, twisted fibers with diameters of 0.2 mm, 0.22 mm and 0.3 mm, respective lengths of 20 mm, 22 mm and 30 mm and made of high elastic steel fibers with aspect ratio (l/d) of 100 are used at volume fractions of 1%, 1.5% and 2%. The results of the examination of the direct tensile behavior reveal the occurrence of strain hardening after early cracking. K-UHPC using twisted fiber exhibits significantly improved mechanical characteristics compared to UHPC using conventional straight fiber. Equivalent or superior performance is developed when small proportion of about 0.5% of steel fiber is adopted and 90% of the performance is developed when small proportion of approximately 1.0% of fiber is admixed. Consequently, the use of twisted fiber in K-UHPC opens the possibility to achieve economically efficient fabrication by enabling significant reduction of the amount of fiber.
The Influence of Temperature Sensitivity of Cold Recycling Materials on the Pavement Structure Mechanical State
Authors: Zhou Hao , Zhang Gui Xia , Sun Gao Feng , Li Chu
Published: December 2012

The cold recycled materials have temperature sensitivity; both the modules and the strength will decrease with the increase of temperature, which will change the mechanical state of pavement structure. The temperature sensitivity of cold recycling materials may produce failure. Two typical pavement structures, which have been used in practical project, were selected in the analysis. The result shows that the mechanical state of cold recycling pavement without semi-rigid base will be improved in hot summer, while the mechanical state of the cold recycling pavement without semi-rigid base will be deteriorated in hot summer which may produce adverse state.
The Curing Residual Strain Monitored by Fiber Bragg Grating Sensors
Authors: Tian Heng , Ye Chun Sheng , Bao Xiu Ting
Published: December 2012

The origin and damage of curing residual stress were firstly investigated briefly in this paper.And then Fiber Bragg Grating (FBG) sensors with different central wavelength were used to test the temperature sensitivity and the strain sensitivity. At last, the naked and encapsulated FBG sensors were layed parallelling into prepreg to monitor the whole curing process, and the results clearly showed the situation change of strain, the appearance of gel point and glass transition temperature.
The Design and Implementation of the Terminal in a Vehicle Exhaust Real Time Detecting System
Authors: Lin Feng , Yan Jin , Ye Zhen Zhou , Song Yi Jin , Chen Hong Yan
Published: December 2012

This research proposed a real time exhaust measuring system and realized automatic acquisition of exhaust data. In this research, VMT (Vehicle Mounted Terminal) which is integrated with GPRS module, GPS module,exhaust detection unit and microcontroller unit, collected the concentration of CO2, CO and HC and the vehicle location which were then sent to MC (Monitoring Center) via GSM/GPRS net. In this way, both exhaust transient data under daily running and vehicle location are available to environment protection department, which provided a new method to rid high emitting vehicles in urban areas. The system has extensive practical value in vehicle exhaust online detecting, remote vehicles management and environment monitoring.
A Test of Mtem’ Application in the Iron Mine ahead to Explore the Water
Authors: Liu Xiang Hong , Zhang Ping Song , Sun Lin Hua , Chen Song
Published: December 2012

In the iron ore mining process, often encounter the fault fracture zone, the weak interlayer and the moisture content of the anomalous body is not a direct predictor of adverse geological formations, timely forecasts and governance of these geological disasters will affect the safety in production. Geophysical techniques in many prediction methods for its non-destructive, accurate, efficient, fast and to be recognized. Which, in different geological conditions, mine transient electromagnetic apparent resistivity differences obvious response, the data processing results can be accurate lithologic difference between the electrical changes in interface, has been confirmed in a lot of Mine Water Project. On the basis of a brief introduction to the basic principles of multi-mine transient electromagnetic, combined with the theoretical premise in the exploration of iron ore, iron ore project instance try to explain mine transient electromagnetic Iron Ore Mine water.
A New Design Approach for PSS Conceptual Development
Authors: Yang Lu Jing , Xing Ke , Lee Sang Heon
Published: December 2012

Product Service System (PSS) is introduced as a new concept which means the products and services can be integrated to a package and delivered to customer. From the definition and classification, a PSS can be seen as a system including a set of servicing modes of product. Therefore, designing appropriate PSS to satisfy customer requirements is an important issue in current research. This article reviews current design methodologies and categorized them into three patterns. Each pattern has its advantages and limitations. Hence a new design approach is proposed in this paper. This approach includes integral develop process and focuses on the conceptual design of PSS, which requires innovative thinking to identify possible servicing modes according to customer requirements. Then the evaluation method is provided to help designers to select the principle conceptual solution.
Research on Frequency Conversion ＆ Selective Measurement and Error Correction Algorithms in Grounding Characteristics Measuring System
Authors: Wang Si Qi , Chen Xi Wen , Guo Zi Juan , Wang Xu
Published: December 2012

The paper concerns algorithms error and parameters correction technology of frequency conversion＆selective measurement in grounding characteristics measuring system. It analyzes estimation method of signal amplitude phase based on Fourier transform, calculates the sensitive degree of the method to frequency error, and also presents several major parameters for the algorithm, including sampling rate, data length and selection condition of frequency resolution in order to meet the high precision measurement requirements. Furthermore, the paper analyzes correction algorithm of amplitude and phase error caused by unknown nonlinearity of circuit during the practical measurement.
Identification Research on CMP Multi-Zones Pressure System
Authors: Wen Yan Wu , Lu Xin Chun , Zhang Hui , Zhou Kai , Ye Pei Qing
Published: December 2012

In the process of very large scale integrated circuit (VLSI) manufacturing, Chemical Mechanical Polishing (CMP) technique is one of the most effective wafer global planarization techniques. The polishing quality depends not only on the slurry and polishing head structure, but also on accurately wafer polishing pressure control. However, the polishing pressure accurately control depends on a generalized pressure control system of the polishing head and multi-zones pneumatic pressure system. As the system has time-varying, nonlinear and coupling characters, it is difficult to apply theoretical modeling method for obtaining the accurate mathematical model. Therefore, this paper presents a method based on subsubmodel identification to establish the precise mathematical model of the pressure control system. The experimental results show that the method is feasible, practical and accurate.
Dynamic Analysis of Variable-Step Feeding
Authors: Chen Peng Fei , Cai Ji Fei , Xu Shu Bo
Published: December 2012

In order to make achieve univesal feed, the feeding step of feeder should be able to regulate stepless according to the requirement of different devices.Though the motion analysis of the belt driving mechansim with changing step and the finite element analysis about one group of transmisson pully cone,we can proved that the accuracy of the structural parameters design of the transmission cone pully.
Vibration Characteristic Similarity Appraisal of Conticaster Vibration Table
Authors: Yang Wen Zhi , Cui Zheng , Ren Xue Ping , Su Feng Qi
Published: December 2012

Measured vibration displacement data of conticaster vibration table at different casting speeds, use of "correlation" theory to evaluate the measured data. Get similarity change curve and oscillation amplitude change curve of the four measured points at different casting speeds. The results reflect the crystallizer’s real situation during exercise. Provide a reliable basis for field equipment maintenance and control.