bluuebunny/crossref_metadata_2025 huggingface dataset:
Stability Analysis for Slopes of Maerdang Hydropower Station with the Three-Dimensional Limit Equilibrium Method
Authors: Huang Yi Sheng , Li Jian Lin
Published: March 2013

Firstly analyzed the stability of blocks with block theory and secondly evaluated the stability of blocks with three-dimensional limit equilibrium method and finally evaluated the whole stability of slopes. Stability analysis for the slope of Maerdang hydropower station shows that natural slopes which belong to the upstream of Hadehei ditch on the right bank will not occur wedge slide, tailrace slopes of hydropower station have not sliding slopes searched which are in potential slide, if taking some measures to reinforce the stability of man-made slopes on the face rock-fill hub, which may meet the demand of the specification.
Stress-Deformation Numerical Analysis of Clay Core Rockfill Dam Based on Duncan-Chang E-B Model
Authors: Zhang Hong Hai , Gong Ai Min , Wang Chun Yan
Published: March 2013

Used static finite element method to analyse the clay core rockfill dam of laojunshan reservoir whith Duncan-Chang E-B model. The results shows that the maximum of stress level is 0.78 under completion mode, and the maximum of stress level is 0.9 under normal operating condition. The stress and displacement value of the dam as well as its distribution rule is normal, and the maximum of stress level is less than 1. The possibility of occurring hydraulic split for core-wall is very small, and the dam is in a safe state.
Analysis on the Discrimination Method of Seismic Liquefaction
Authors: Hu Jiang Chun , Wang Hong Fang , Li Chen
Published: March 2013

Seismic liquefaction is a major geological hazard of earthquakes. In the paper, the earthquake liquefaction of subway engineering in GUANGZHOU is calculated based on the standard penetration test method according to the rules of code for seismic design of buildings, specifications of earthquake resistant design for highway engineering, code for water resources and hydropower engineering geological investigation as well as the railway engineering anti-earthquake design specification. It is concluded that different code have very different result on sand liquefaction discrimination. And the data selection is a key factor when we discriminate sand liquefaction. The shortage of codes is evaluating the site liquefaction according to the data of points. The conclusions have positive role for engineering seismic liquefaction discrimination and the seismic liquefaction mechanism research.
Seismic Behavior of Two-Story Brick Masonry Building
Authors: An Dong , Qu Tie Jun , Liang Jian Wen
Published: March 2013

In order to investigate the seismic behavior include hysteretic curve, skeleton curve and stiffness degradation, four masonry structures with different details are tested under pseudo-dynamic test and low cycle lateral load test. One kind of full-scale building is confined masonry with tie-column and ring-beam. Other is common brick masonry. Test results indicate that the tie-column and ring-beam play an important role for developing higher resistance and better deformability. And tie-column and ring-beam can effectively confined brick wall to improve the seismic performance of masonry structure. The stiffness degradation curves are similar. The stiffness degradation is modeled as a function of the effective stiffness and lateral displacement.
Simplified Method of Isolated Structure Collapse Capacity Part, (I): Ground Motion Intensity Measure
Authors: Liu Yang , Liu Wen Guang , He Wen Fu , Yang Qiao Rong
Published: March 2013

The equivalent velocity spectrum as a new ground motion intensity measure (IM) characterization parameter is proposed in this paper. 44 far field ground motions and 20 near-field high-speed pulse seismic waves were used for single-degree-freedom (SDOF) nonlinear time history analysis, respectively. The correlations between five IMs and maximum deformation for SDOF at various periods and different yield coefficients were analyzed. The results show that for the structures with medium-to-long period, the correlation coefficient average value of the proposed equivalent speed and maximum deformation is more than 0.6, and maximum of those is more than 0.9. The correlation coefficient average value by using the proposed equivalent speed under far field ground motions is more than those under near field ground motions. The P-delta effect on the correlation coefficients between proposed IM for the structures with medium-to-short period is significant
A New Method of Fracture Designing to Elevate SRV in Natural Fractured Sandstone Reservoir
Authors: Weng Ding Wei , Lei Qun , Guo Zi Yi , Luo Yong
Published: March 2013

This paper firstly analyze the relationship between the fracture net pressure and the sand to fluid ratio (SOR), and the conclusion is that the high SOR could accumulate high net pressure to make the natural fractures open in natural fractured sandstone reservoir. Then relationship between the cumulative oil production and opening the natural fractures is analyzed by means of reservoir numerical simulation, and the conclusion is that the cumulative oil production increased apparently as the area of opening natural fractures increasing. Based on the analyses, a new method of optimizing fracture conductivity to elevate the stimulating reservoir volume (SRV) was formed: firstly, evaluate the stress field and calculate the critical net pressure of the natural fractures opening; secondly, determine the average proppant concentration according the relationship between the net pressure and proppant concentration; thirdly, calculate the fracture conductivity according to the proppant concentration; at last, optimize the fracture length. There are two key works: one is acquiring the accurate principal stress combining the indoor experiment and field test; the other one is acquiring accurate conductivity of proppant, and long term conductivity experiments are recommended.
Spillway Design for Xiaoguo Reservoir Danger Control and Reinforcement Project
Authors: Tang Ke Dong , Jing Rui Li , Wang Chong
Published: March 2013

combined with the spillway design of Xiaoguo reservoir reinforcement engineering, this paper introduces and researches the whole arrangement of the spillway, the calculation of discharge capacity and water surface line of chute and hydraulic calculation of stilling pool. The related process and results can provide a reference for similar engineering.
Rock-Concrete Joints Reliability during Building Process of Super Dam
Authors: Wang Ya Jun , Ren Da Chun , Gan Xiao Qing , Dong Zhi Hong
Published: March 2013

Super dam construction under high steep slope is threatened by the uncertainty of shear strength development of rock-concrete joints. With numerical theory, the shear stress vector distribution of interface was studied. The simulation results show that dam section 23 of Xiluodu arch dam has enough safety reservation at rock-concrete joints zones with 4-lift separate pouring.
Influence of Concrete Tension Softening Properties on the Steel-Liner Reinforced Concrete Penstock
Authors: Wu Hai Lin , Du Xiao Fan , Qin Shi He , Li Yao , Li Qun
Published: March 2013

In combination with the practice of a large hydropower station, concrete damaged plasticity model is introduced into the steel-liner reinforced concrete penstock for the nonlinear analysis, the damage distribution rules of the surrounding concrete and the stresses of the steels are furtherly studied under the different tension softening characteristic curves, the conclusions can provide the reference for damage assessment of the surrounding concrete and the optimization allocation of the reinforcement for the penstock.
Mixed-Mode I/II Crack Extension in Thin Sheet Metal
Authors: Shao Yong Ping , Yang Bang Cheng , Ran Chun , Lv Jing
Published: March 2013

Real-time displacement in stable crack tearing was measured by digital image correlation technique. Quantitative analyses were provided on mixed-mode Ⅰ/Ⅱ fracture and critical CTOA for recycled thin sheet metals. It is shown that the fracture of recycled thin sheet metals is tough due to the large plastic deformation, and mixed-mode crack is easier to extend than mode Ⅰ crack. The critical CTOA at stable crack tearing is constant and can be used as a fracture criterion for the thin sheet metals.
A Sampling Method to an Inverse Scattering Problem for Stationary Schrödinger Equation
Authors: Li Yuan , Yao Ming Chen , Wang Chun Mei , Zhang Fa Yong
Published: March 2013

For an inverse potential scattering problem of stationary Schrödinger equation, we employ a direct sampling method to reconstruct the support of the potential. Compared with the general sampling method, the method we adopt is applicable even when the measured data (near-field data) are only available for one or several incident directions, and has the advantages of simple computation and insensitivity to noises. By the mathematical derivations, we conclude theoretically that for both two dimensional and three dimensional cases, this direct sampling method is feasible and efficient.
Study on the Effect of WC Size on the Thermal Expansion Coefficient of WC/Cu Composites
Authors: Yu Hai , Guo Rong Xin , Xia Hai Ting , Yan Feng , Zhang Yu Bo
Published: March 2013

Abstract: In order to study the effect of WC size on the thermal expansion coefficient of WC/Cu composites after anneal, WC/Cu composites with different WC particle size were prepared by powder metallurgy method. In this paper the thermal expansion coefficient of WC/Cu composites were measured by digital image correlation method. The results show that the thermal expansion coefficient increased with the increasing of temperature and the particle size.
Description of Large Deformation Problem Using Means of Visual Strain
Authors: Xu You Liang
Published: March 2013

The constitutive equation of large deformation problem is closely related to geometric description. Nowadays, linear strain tensor is no longer unsuitable to describe large deformation. However, the existing non-linear strain tensors have complicated forms as well as no apparent geometric or physical meaning. While, the increment method is used to solve, however, convergence and efficiency are low sometimes. Thus the idea of visual strain tensor is proposed, with distinct meaning and visual image. Beside, it is likely to be used in engineering measurement, and it can be connected with measured constitutive equation directly. Thus this research provides a new idea and method for solving large-deformation problems in practical engineering.
Modified Polymer Material Used for Oxidative Desulfurization of Diesel Fuel
Authors: Luo Ying Wei , Li Chun Hu , Zhu Jian Peng , Feng Li Juan , Wang Liang
Published: March 2013

The author chose three kinds of commercial resins for blank experiment and then added oxidants.We studied that how removal rate changed under different temperature and picked the D001-cc as the best supporter in desulfurization procedure. And heteropolyacid was supported onto D001-cc with different loadings,the results showed 10% was the optimal condition.
Effect of Cu(Cr0.2Al0.8)2O4/TiO2 Composite Film Electrodes on DSSC Photoelectric Properties
Authors: Zhou Feng Xia , Jiang Yan Yan , Zhang Ji Wen , Liu Jing Xiao , Liu Gui Shan , Hu Zhi Qiang
Published: March 2013

Cu(Cr0.2Al0.8)2O4/TiO2composite film electrodes were prepared on FTO glass substrate by screen printing method after Cu(Cr0.2Al0.8)2O4nano-particles were doped in TiO2powers. The characteristics were studied by the X-ray diffraction for the crystalline structure of composite films, UV-Vis diffuse reflectance spectrum instruction for absorption spectrum of composite films and dye sensitized solar cells tester for the performance of DSSC. The results show doping Cu(Cr0.2Al0.8)2O4powers could enhance UV-Vis spectral absorption strength and improve the photoelectric conversion efficiency of the solar cells when the doping content of Cu(Cr0.2Al0.8)2O4is 3％. Compared with pure TiO2film electrodes, the photoelectric conversion efficiency of the solar cells reaches to 3.59％.
Analysis of the Crack Propagation Based on Extended Finite Method
Authors: Jang Zhen Wen , Wan Shui , Cheng Chen
Published: March 2013

For solve efficiently the problem of crack propagation, the extended finite method(XFEM) was applied to analyse the problem. The extended finite method introduced nodal enrichment functions based on usual nodal shape functions, and traced crack propagation with the level set method. The extended finite method can model arbitrary crack growth without remeshing. This paper simulated the problem of the compact tension specimen with circular hole by extended finite method. The calculation results show that the extended finite method can solve efficiently the problem of crack growth , and the circular hole of compact tension specimen effect the trajectory of mode I crack propagation within certain distance.
Predictions of the Effective Elasto-Plastic Properties and Cohesive Strength of the Spruce Fiber Reinforced Polypropylene Composite
Authors: Shen Min , Liu Yang
Published: March 2013

The spruce fiber reinforced thermoplastic polypropylene (PP) composite is studied in this paper aiming at inspecting the effect of micromechanics parameters on the effective elasto-plastic property of composite by the numerical methods. The local stress field changing with the fiber aspect ratio and volume fraction is detailed investigated. At the last the normal cohesive strength of the interface is predicted initially. The numerical results show good agreement with the theoretical prediction results and available data.
Preparation of Quercetin-Ni+2 Metal-Complexing Imprinted Polymer and its Recognition Performance Evaluation
Authors: Wang Yu Jie , Wang Bing
Published: March 2013

Using the complex of quercetin and Ni+2 (quercetin-Ni+2) as template (quercetin is a kind of flavonoids which are important active ingredients of Chinese herbs.), methacrylic acid as functional monomer and ethylene glycol dimethacrylate as cross-linker, metal-complexing template polymer has been prepared in the mixed solution of methanol and tetrahydrofuran by molecular imprinting technique. The coordination structure and complex ratio between quercetin and Ni+2 were studied by UV-visible spectroscopy, and the ternary complexation of quercetin, Ni+2 and methacrylic acid was verified by similar methods. Selective adsorption experiments for substrates indicated that compared with quercetin’s structural analogs (baicalein and baringenin), quercetin-Ni+2 template polymer prepared with appropriate amount of cross-linker exhibited significant adsorption selectivity for quercetin in the presence of Ni+2. The separation factors were 3.915 and 5.443 respectively, which also showed that adsorption capacity was greatly influenced by the amount of cross-linker.
Bending Fatigue Life Prediction of Fillet Rolled Crankshafts
Authors: Bao Ke , Liao Ri Dong
Published: March 2013

The influence of residual stesses must be considered in bending fatigue life prediction of fillet rolling crankshafts. In this paper, the stress/strain distributions near fillet during fatigue tests are calculated by finite element method. In residual stress computation, the three dimensional flexible contact model is adopted, and in bending strain computation, the static analysis are selected. Then, bending fatigue life prediction is performed by local stress-strain approach based on the residual stess and bending strain amplitude, and the results agree with the bending fatigue test.
Morphology Transition of Diblock Copolymer with Nanoparticles Confined in Cylindrical Nanopores
Authors: Yu Ying , Zuo Yu Xin , Zhang Zhao , Zuo Chun Cheng
Published: March 2013

Coarse-grained molecular dynamics simulations on self-assembly behavior of diblock copolymers (DCP) with nanoparticles confined in cylindrical nanopores are perfomed to study the morphology transition of DCP affected by the confined ratio of the cylindrical confinement diameter to the block copolymer domain spacing, the wall-polymer interactions, the particle-polymer interaction potential and the component concentration. The simulation results show that nanoparticles have a pronounced effect on the morphology transition of DCP and can therefore be considered as an important aspect in controlling the confined self-assembly in cylindrical confinement. Besides, the phase diagram indicates the process of morphology transition.
Dispersion of Multi-Walled Carbon Nanotubes Modified with Poly-L-Lysine in Water
Authors: Zhang Ting Ting , Zou Li Ming , Ling Xin Long , Li Xi
Published: March 2013

A noncovalent method was presented in order to improve the solubility of multi-walled carbon nanotubes (MWCNTs) in water. Poly (ε-benzyloxycarbonyl-L-lysine) (PZLL) was prepared by ring-opening polymerization of ε-carbobenzoxy-L-lysine N-carboxyanhydride (Z-L-Lys NCA). After the removal of the benzyloxycarbonyl group, water-soluble poly-L-lysine (PLL) was obtained. The structure of PZLL and PLL was characterized by FTIR and 1H NMR. Dispersion of MWCNTs in the water solution of PLL was investigated by ultraviolet spectrophotometer and visual inspection. When the mass ratio of MWCNTs to PLL is 1:50 and the pH value of the water solution of PLL is 5, MWCNTs can be well dispersed in water.
Computational Study of Thermal Stabilities of Cu Nanorods at Atomic Scale
Authors: Zhang Duo , Ju Yi , Zhang Lin
Published: March 2013

Due to its unique mechanical，electrical，optical，chemical，catalytic and biological properties, nano-scale materials such as metal nanorods, have attracted wide attention. In these low-dimensional systems， Cu nanorods are ideal systems in novel electronic nano-devices and nano-catalysis. Nowadays the research of Cu nanorod has already become one of the central subjects in the nanomaterials science.In this paper, molecular dynamics simulations have been used to study structural changes of Cu nanorod during heating within the framework of embedded atom method (EAM) at the atomic scale，and their dynamics are also studied. During continuously heating processes, by studying the structure of the metal nanorods on the pair distribution function and energy changes，they are studied for the structural changes and dynamic properties of the Cu nanorods.The simulation results show that continuous changes of the Cu nanorods upon heating. At low temperatures, both the Cu nanorods have ordered arrangements with face-centered cubic structures. With increasing the temperature，the atom arrangements present the changes from the ordered state into the disordered state. It is also found that the size and shape of the nanorods have effect on the structural changes of these nanorods in the heating processes. The results show that the initial geometry of the nanorods greatly affect the structural change processes.
The Local Defect Effect on Molecular Local Density State in Carbon Diamond Structures
Authors: Sun Shih Chieh , Hsu Chao Ming , Lin Jau Wen , Kuang Jao Hwa
Published: March 2013

The effect of local molecular structural cavity defect on the atom frequencies of bonded atoms is investigated in this study. The molecular dynamic (MD) simulation method is used to simulate the variation of atom frequency near by the cavity defect in a carbon diamond structure. The potential energy model, i.e. the second-generation reactive empirical bond order (REBO) potential function, is employed to derive the dynamic interaction between bonded atoms. The effect of local defect on the vibration amplitude and the density of state (DOS) is studied. The simulated results indicate that the local defect may affect the dynamic behavior of atoms near the local cavity defect significantly.
Ag Nanoparticle Functionalized TiO2 Nanowire Thin Film and its Gas-Sensing Application at Room Temperature
Authors: Huang Huan Di , Zhu Hui Juan , Jiang Liang Shu , Zhao Huan Yu
Published: March 2013

Ag nanoparticle functionalized TiO2nanowire (TiO2NW @ Ag NP) was synthesized and the gas sensing properties of the nanowire film was investigated. The size and the distribution density of Ag nanoparticles can be easily controlled. The sensor based on Ag nanoparticle functionalized TiO2 nanowire thin film has promising sensing properties, and at room temperature, its sensitivity towards H2and O2can reach 500 ppm and 1000 ppm respectively.
Effects of Stress Amplitude on Fatigue Behavior of Extruded Mg-3Al-2Sc Alloy
Authors: Sha Gui Ying , Wang Jie , Liu Teng , Li Zhao Hua , Han Yu
Published: March 2013

Through stress-controlled fatigue testing under different stress amplitudes, effects of stress amplitude on the fatigue life and crack propagation mechanism of the extruded Mg-3Al-2Sc alloy were investigated. The results show that, within the stress range of 13.5~82.5 MPa and stress ratio of 0.2, the fatigue life of the alloy decreases and growth rate of fatigue crack increases with increasing stress amplitude. Cleavage fracture mode dominates the crack initiation area and stable crack propagation area. For the final rapid fracture area, the fatigue fracture is combined mode of semi-cleavage and cleavage as well as intercrystalline fracture.
Conceptual Study on an Origami Patterns of Type I Tapered Square Tub with and without a Crack
Authors: Katangoori Rahul Reddy , Kao-Walter Sharon , You Zhong
Published: March 2013

Thin-walled tubes with origami patterns are popular design for the energy observing devices. However, less study has been done when they subjected to cracks. In this work, the origami square tube with different height to wall thickness ratio are first studied to investigate the collapse modes and deformation mode. Further more, stress concentration areas are identified by numerical simulations. Finally, horizontal and vertical crack was implemented in one of the side in order to study the effect on the deformation mode.
Property Study on High-Speed Steel Deposited TiN Coatings by Magnetron Sputter Ion Plating
Authors: Zhang Ning , Zhang Chun Hong , Qiang Ying Huai
Published: March 2013

TiN coatings were deposited by Magnetron Sputter Ion Plating (MSIP) on the surface of high-speed steel W18Cr4V.The microstructure,coating thickness, micro-hardness and wear resistance of surface modification sample were investigated by the D/MAX-ⅢB X-ray diffraction tester, the coating thickness tester, the HV-1000 micro-sclerometer,the LKDM－2000 friction and wear tester,the S-3000N scaning electron microscopy.The influence of sputtering time,N2 partial pressures and sputtering current on the microstructure,coating thickness, micro-hardness and wear resistance of TiN coatings were also analysed.The best synthesis performance sputtering coatings of technologic scheme was established.
Study of Metallurgical Properties in the Sintered Ore with Variable SiO2
Authors: Zhang Qing Jun , Li Yuan Liang , Ma Xue Gang , Cui Zhi Min , Zhang Yu Zhu
Published: March 2013

The low silicon sintered ores are prepared, where SiO2 content is 4.4%, 4.6%, 4.8%, 5.0% and 5.2%, respectively. Their metallurgical properties are also measured. The results state that the low temperature reduction degradation of low silicon sinter is improved with the SiO2 content increase. With the SiO2 content increasing in low silicon sinter, the reducing index sharply decline, and reduction gradually deteriorate. In the meantime, softening initial temperature gradually reduced, softening interval gradually widened, so exceeded SiO2 content does harm to softening property.
Study on the Critical Damage Value and Processing Map of AZ80 Magnesium Alloy Forming at Elevated Temperatures
Authors: Xue Yong , Zhang Zhi Min , Wu Yao Jin
Published: March 2013

In the present research, a series of AZ80 magnesium alloy billets were compressed with 60% height reduction on hot process simulator at temperatures of 473,523,573,623,673,723K under strain rates of 0.001, 0.01, 0.1,1 and 10s-1. The value of the Cockcroft-Latham equation, i.e. critical damage value, was calculated from the finite element calculations for the compression tests. The results show that the critical damage value is not a constant but varies in a range from 0.1397 to 0.4653. Meanwhile, the processing maps based on the Dynamic Material Modeling (DMM) were constructed. From the processing maps, the optimal deformation processing parameters are the deformation temperatures ranging from 573 to 623K and strain rates ranging from 0.001 to 0.01s-1 in view of improving the mechanical properties of AZ80 alloy component.
Optimized Wire Bonding Process on Micro-Connection Pad with Ni/CeO2 Coatings
Authors: Wang Chun Yu , Wang Qing , Li Han Zhu , Ji Xiao Zhi , Kang Zhi Long
Published: March 2013

Keywords: Electroless plating Ni, CeO2, Micro-connection pad, Wire bonding Abstract. It is Ni/CeO2 coatings that have been prepared on SiC/Al composites surfaces (electroless plating Ni and depositing CeO2 conversion coatings). It is employed to wire bonding process as a new micro-connection pad in this paper. During bonding process, ultrasonic time, ultrasonic power, bonding pressure, etc. have been investigated. The optimized parameters are obtained with the best bonding properties.
Synthesis and Characterization of CdTe Quantum Dots Capped by N-Acetyl-L-Cysteine
Authors: Liao Xiu Lin , Yang Na , Xie Lin Xiang , Yang Xiao Cui , Yang Xiu Pei
Published: March 2013

The highly luminescent cadmium telluride quantum dots (CdTe QDs) have been synthesized by using N-acetyl-L-cysteine (NAC) as stabilizer in aqueous solution. Experiments indicate that the QDs nanocrystals could grow larger as the extension of reaction time, causing the red shift of emission spectra. The typical product was analyzed by fluorescence spectroscopy, high-resolution transmission electron microscope (HRTEM), x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The morphological and structural characterization confirmed the formation of monodisperse CdTe QDs with several nanometers in size.
Mixed State Hamiltonian Element for Plane Transversely Isotropic Magnetoelectroelastic Solids
Authors: Li Xiao Chuan , Zhang Jin Shuang
Published: March 2013

Hamiltonian dual equation of plane transversely isotropic magnetoelectroelastic solids is derived from variational principle and mixed state Hamiltonian elementary equations are established. Similar to the Hamiltonian formulation in classic dynamics, the z coordinate is treated analogous to the time coordinate. Then the x-direction is discreted with the linear elements to obtain the state-vector governing equations, which are a set of first order differential equations in z and are solved by the analytical approach. Because present approach is analytic in z direction, there is no restriction on the thickness of plate through the use of the present element. Using the propagation matrix method, the approach can be extended to analyze the problems of magnetoelectroelastic laminated plates. Present semi-analytical method of mixed Hamiltonian element has wide application area.
Effect of Compaction on the Surface Morphology of CuInSe2 Thin Films
Authors: Yuan Xiaojun , Wang Yan Lai , Xu Jin Gang
Published: March 2013

The CuInSe2 compound was prepared by paste coating and electrodeposition-selenization. Observed by scanning electron microscopy (SEM), the surface morphology of CuInSe2 thin films was improved by compaction. The result of the present work implied that the CuInSe2 film with smooth surface could be obtained under the pressure of 500 MPa at 60 °C.
Thermodynamic Properties and Optimized Fiber-Drawing Condition in Germanium Tellurite Glasses
Authors: Fu Fang Fang , Lei Yu , Yang Jie , Wang Zhi Qiang , Zhao Xin , Lin Hai
Published: March 2013

Thermodynamic properties of the heavy metal germanium tellurite (NZPGT) core and cladding glasses have been investigated. Coefficient of thermal expansion (CTE) and softening temperature (Ts) of the Er3+⁄Yb3+ codoped NZPGT core glasses were identified to be 1.89×10–5 °C–1 and 343 °C, respectively. Glass transition temperature (Tg), onset crystallization temperature (Tx), peak temperature of crystallization (Tc), temperature difference value (ΔT) and thermal stability parameter (H) of the core glasses were solved to be 290 °C, 412 °C, 470 °C, 122 °C and 0.42, respectively, and the corresponding vaules of cladding glasses were derived to be 290 °C, 391 °C, 400 °C, 101 °C and 0.35. The investigation results indicate optical fiber drawing of Er3+⁄Yb3+ codoped medium-low phonon energy NZPGT glasses can be achieved in the temperature range 345—380 °C, which provides a valuable temperature reference for further high-quality optical fibers drawing in developing optical devices.
Synthesis and Surface Photoelectric Properties of a Trinuclear Chromium(III) Complex
Authors: Shi Zhong Feng , Li Jia Ming , Yin Yan Zhen , Zhang Li , Huang Ni , Feng Rui Yun
Published: March 2013

A trinuclear Chromium(III) complex [Cr3(μ3-O)(μ2-PCBA)6(CH3OH)3]NO3∙H2O∙CH3OH (HPCBA = 4-Chlorobenzoic acid) has been synthesized and characterized by single-crystal X-ray diffraction, IR spectra, UV-Vis absorption spectra and elemental analysis, which belongs to monoclinic, space group P21/c with a = 12.443 (3), b = 24.543 (5), c =22.094 (7)Å, α = 90°, β =115.76 (2) °, γ =90°, V = 6077 (3)Å3, Z = 4.The surface electron behavior of the chromium complex has been studied emphatically by surface photovoltage spectroscopy (SPS). Structural analyse indicate that the complex is molecular complex. The result of SPS show that there is positive photovoltage response bands within 300–800 nm, which indicate that it possess obvious photoelectric conversion properties. There was a good correlation between the SPS and UV-Vis absorption spectra.
Research on Thermal Performance of the Wall Systems of Steel Public Buildings
Authors: Pan Shi , Zhang Si Wen
Published: March 2013

In view of the present situation of high energy consumption from buildings in China, we study the thermal performances of the different wall systems of steel public buildings. We test on insulation tests for the different wall systems by protective thermal box law in the laboratory. According to the test data, we analyze differences between test values and theoretical values in order to determine the different wall systems for the different climatic regions and provide foundation to choose the wall systems of steel public buildings for energy savings.
Effect of Initial Curing Conditions on Thaumasite Form of Sulfate Attack of Cement Based Materials
Authors: Yang Chang Hui , Xiang Xiao Bin , Liu Ben Wan , Zhang Jing
Published: March 2013

The effects of initial high humid air-curing, standard water-curing and sealed-curing on thaumasite form of sulfate attack (TSA) of cement based materials were studied. The erosion products after three years attack in 5% MgSO4 solution were analyzed by means of X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Initial high humid air-curing can delay the TSA of specimens for CaCO3 generated by carbonation and filled in the pores of the specimens, forming a compacted surface and restricting the intrusion of SO42-. In comparison, specimens cured in sealed condition occurred TSA most serious resulting from that large amount of inter-defects in specimens for the lower hydration degree, and SO42- ions could intrude into specimens more easily.
Effect of Different Heat Treatments on Microstructure and Mechanical Properties of Steel Containing Ni of 9% Base and Weld Metals
Authors: Zhang Min , Chu Qiao Ling , Li Ji Hong
Published: March 2013

An comparative study was made of microstructure and mechanical properties of steel constaining Ni of 9% in different heat treatments. Shielded metal arc welding (SMAW) was employed as jointing technique. Double normalizing and tempering (NNT) and quenching, intercritical quenching and tempering (QLT) were applied as the heat treatments. Instrumented impact and tensile tests were performed between 20°C and 196°C. The results show that both the microstructure and mechanical properties of base and weld metals in QLT solution turn out to be the optimal.
Effect of Isothermal Forging on Microstructure and Mechanical Properties of TiAl-Based Alloys
Authors: Sun Hong Liang , Huang Ze Wen , Zhu De Gui
Published: March 2013

The effect of isothermal forging on microstructure and mechanical properties of Ti-44Al-4Nb-4Zr-0.2Si-1B alloys were investigated by means of BSE, TEM, tensile and the high cycle fatigue test at room temperature. The results showed that the lamellar thickness and volume fraction of equiaxed γ phases and B2+ω phases decreased, the grain size and volume fraction of lamellar α2+γ colonies was raised after isothermal forging. The lamellar was bending. The tensile strength and yield strength was increased by 80MPa although the total elongation hardly changed. The fatigue limit was increased by 230MPa. The effect of boride, lamellar thickness and B2+ω phases on the mechanical properties were studied.
Establishment of Constitutive Equation of Tube in Hydroforming
Authors: Jia Hui Jie , Yang Lian Fa , Wu Chun Lei
Published: March 2013

Tube hydroforming (THF) technology is an efficient and economical technology of tube plastic forming process. Constitutive equation is the foundation of tubular material selection and finite element analysis, which also provides a way of mathematical modeling in reflection of material macroscopic properties. In this paper, the importance of constitutive equation to THF process is briefly discussed; the present establishment methods of constitutive equation are classified; the advantages and disadvantages of these methods are clarified; the development trend in establishment methods is summarized.
Mold Temperature Influence on Tensile Strength and Fiber Orientation of Plastic Parts in Dynamic Mold Temperature Injection Technology
Authors: Li Xi Ping , Gong Ning Ning , Cheng Guang Ming
Published: March 2013

Dynamic mold temperature injection technology can be used to eliminate many surface defects such as weldline, flow mark that usually appear on the polymer parts. In this paper, fiber reinforced ABS material is employed in order to study the influence of mold temperature on tensile strength and fiber orientation properties in dynamic mold temperature injection technology. By studying the standard specimens obtained in our laboratory, the relationship between the tensile strength and the dynamic mold temperature was demonstrated. The influence of the fiber orientation on the tensile strength was also investigated. Experiment results showed that the fiber orientation in different places of the specimen had a great effect on its tensile strength. Studies presented in this paper are of great help to promote the application of the technology in fiber reinforced polymer material.
Study on Length of Cartridge how to Affects Cutting Capability of the Combustion Cutting Ammunition
Authors: Wang Sen , Xin Wen Tong , Qu Li Feng , Wu Yi Ying , Yang Jian Dong
Published: March 2013

A type of cutting technology of manual thermite cutting technology is developed which is meet the incise requirements in especial environmental .The combustion cutting ammunition is made from cutting medicament, cartridge, nozzle. There are two synchronism courses of events to form the hole. Firstly, specimen is melted by megathermal jet stream, and then heating specimen to its burning point so that it burns with oxygen which is from jet stream and reduces melting point of specimen with alloy agent. The bright and clean hole comes into being after blowing off the slag by high-speed airflow. The paper ensured proper length of the cartridge and analyzed burning characteristics of cutting medicament by different length. The best cutting Performance be obtained While the length of cartridge is up to 90mm test on steel of Q235 which area is 2800mm2 and thick is 20mm.
Process Improvement of Camshaft of Heavy Duty Diesel Engine
Authors: Liu Rui Yi , Jun Huang , Cheng Bo
Published: March 2013

Camshaft is a key part of heavy duty diesel engine. The conventional process applies the profiling modeling grinders and universal milling machines to manufacture the cam. The weaknesses of this process include unstable cam profilogram, low accuracy, low flexibility, long product cycle and undesirable adaptability. M40 turn-milling centre and CN320 cam grinder are applied to upgrade the process. Compared with the conventional process, the improved process has evident advantages such as higher machining accuracy, surface quality and efficiency. And the compatibility with diverse product category was greatly promoted.
The Process of Sol-Gel Method Prepared Bi-2212 Superconductors Tapes
Authors: Song Gen Zong , Zhang Duo
Published: March 2013

In this dissertation, Bi-2212 superconducting tapes was prepared by sol-gel method, in addition we mainly studied heat treatment conditions and sintering material drying conditions of the NiO/Ni substrate, and gived a optimization to the process. The heat treatment process of the NiO/Ni substrate had been researched.Based on previous experience, we explored the temperature of heat treatment and improved the process.Afterheattreatment,the samples was analyzed by metallographic microscope and X-ray diffraction,and we analysed these data. It’s concluded that the dense uniform oxide film can be sintered in 800°C with a 3 hours’ heat treatment.We further explored the conditions of the Bi-2212 superconducting materials.During the preparation. We mainly studied the drying temperature and sintering temperature ,because they would affect the gel phase transition and control components. It has a very important effect on high-quality superconducting strip preparation. Experiments results showed that drying the sample at 510 °C in temperature is best. all the samples was analyzed by X-ray diffraction. We summed up the data derived from experiments , it showed that sintering the sample at 850°C,we can obtain the mixed phase of Bi-2201 and Bi-2212.
Biodegradation of Styrene Vapor in a Biofilter
Authors: Huang Xian Sheng , Wu Hao
Published: March 2013

Volatile organic compounds (VOCs) are a new class of air pollutants posing threat to the environment. Newer technologies are being developed for their control among which biofiltration seem to be most attractive. Biofiltration of styrene vapor from air stream was discussed in this study. Experimental investigations were conducted on a laboratory scale biofilter, containing mixture of compost and polystyrene inert particles as the filter materials. Mixed consortium of activated sludge was used as an inoculum. The continuous performance of biofilter for styrene removal was monitored for different concentrations and flow rates. The removal efficiencies decreased at higher concentrations and higher gas flow rates. A maximum elimination capacity of 85g/(m3•h) was achieved. The response of biofilter to upset loading operation showed that the biofilm in the biofilters was quite stable and quickly adapted to adverse operational conditions.
A Mn(II) Metal-Organic Framework Constructed from a Tetrahedral Silicon-Cored Ligand
Authors: Ma Qing Yu , Guan Rui Fang , Li Guo Zhong , Wang Deng Xu
Published: March 2013

A novel metal-organic framework, MnCl2(BIPS)2•2CH3OH•2H2O (1) were synthesized from MnCl2 and a tetrahedral silicon-cored ligand, Me2Si(p-C6H4-imdazol-1-yl)2 (BIPS) under the slow diffusion method. The structure was determined by single-crystal X-ray diffraction. Complex 1 is a 2D sheet structure constructed from 1D chains with 34-atom metallamacrocycles.
A RC Model for Facilitated Transport in Asymmetric Membranes with Fixed Site Carriers
Authors: Jiang Shu Hui , Sun Ya Nan , Zhang Xin Yuan , Sun Zhou , Dai Ling Feng , Ge Dong Tao , Shi Wei
Published: March 2013

A mathematical model for facilitated transport in asymmetric membranes with fixed site carriers was derived by assuming concentration fluctuation and an analogy between electron transport in resistor-capacitor circuit and mass transport in an asymmetric membrane of facilitated transport. In order to examine the validity of the model, bovine serum albumin fixed membranes were fabricated and experiment of facilitated transport of bilirubin was carried out in diffusion cell. The agreement between the theoretical and experimental results is exceptional.
Catalytic Oxidation of Toluene over Metal Oxides Supported on Fiber Material
Authors: Guo Wei , Zhang Hua
Published: March 2013

Toluene is one of the major pollutants of indoor air pollution. Acrylonitrile-vinylidene chloride (AN-VDC) copolymer fibers containing activated carbon were wet-spun; and loaded with Cu-Mn oxide complex. The morphology and performance of the fiber was characterized using scanning electronic microscope (SEM), X-ray diffraction (XRD). The results show that, Cu-Mn oxide complex is loaded on the surface of the fiber. Cu-Mn oxide complex loaded fibers have a higher removal rate to toluene at room temperature. When the molar ratio of copper manganese reaches 1:5, the removal rate of the fiber is the highest among all, which is up to 81.77% The new material for toluene in indoor air purification has a good theoretical and practical value.
A Study on Optimum Calculation of Partial Transmission Ratios of Coupled Planetary Gear Sets
Authors: Vu Ngoc Pi , Nguyen Thi Hong Cam , Hoang Vi
Published: March 2013

This paper introduces a new and effective study on optimum calculation of the partial ratios of coupled planetary gear sets for getting minimum radial size of the gear sets. In the paper, basing on moment equilibrium condition of a mechanic system including two row planetary gear units and their regular resistance condition, an effective model for determining the partial ratios of coupled planetary gear sets was proposed. Especially, by giving this explicit model, the partial ratios can be calculated accurately and simply.
Ship Form Optimization of 62-Feet Yacht and Analysis of Performance
Authors: Zhao Shi Lun , Chen Chao He , Liu Yue Qin
Published: March 2013

This paper focus on the ship form optimization of a 62-feet yacht and uses experienced method based on amount of statistical data to change the width of knuckle lines in order to reduce the resistance of the hull, including comparison of performance of stability and see keeping.
Analysis on Dynamic Piezoelectric Coupling Characteristics of PZT-4
Authors: Zhao Yan , Li Yu Feng , Wang Song Wei , Zheng Yin Huan
Published: March 2013

Structural behavior of piezoelectric stacks has a great impact on electromechanical conversion efficiency of highway piezoelectric generators. In this paper, a single piezoelectric ceramic chip in piezoelectric stack structure was regarded as the object of study to construct the ANSYS model of a single piezoelectric ceramic entity. The selection of SOLID5 makes the piezoelectric ceramic chip into the grid cube and by the coupling field, maintains five aspects of static and dynamic piezoelectric coupling characteristic simulation analysis respectively, including static analysis, modal analysis, harmonic analysis, transient analysis and circuit simulation analysis. The results of all the analyses for the optimal structure design of highway piezoelectric generators are to provide a reference.
Study of the Hydraulic Synchronous Circuit and Synchronous Control of the Hydraulic Hoist
Authors: Ning Chen Xiao , Zhang Xu She
Published: March 2013

This paper briefly classified the common types, working principle and technical characteristic of the hydraulic synchronous circuit. At the same time, the essential factor interfere with synchronization precise of the hydraulic hoist were indicated; and the control strategies and programs of the hydraulic hoist were compared. Further nore, several improvements of improves the synchronization precise and the stability were discussed.
The Study of LED Lighting Color Temperature and Visual Effect
Authors: Huang Ke , He Sha Sha , Gao Ming
Published: March 2013

The application of LED was in an exploring stage, while it had a series of problems on architectural lighting, such as light distribution, color temperature selection and light attenuation. Based on the relations between color temperature and visual effect, this thesis discussed the relations between three kinds of LED color temperature and the changes of human pupil size. In the circumstances of settled lighting conditions, adjust visual regional background brightness, the changes of pupil size was measured with the aid of iView eye tracker. The survey finds that the pupil shrinks with the high rise of light source color temperature, which leads to the improvement of visual efficiency. However, high color temperature appears dazzling, which is likely to cause fatigue and discomfort.
With Random Parametric Equation of Circle Inscribed Polygon Generation Algorithm and Analysis
Authors: Sun Yan Hai , Song Lai Zhong , Shen Tao
Published: March 2013

For getting the parametric equation of random polygon, by the basic extension factor to stretch the round, there generates polygon of meeting the required conditions. Such algorithm overcomes the disadvantage in the generation of polygon from round under control of a single parameter and the complication of mathematical background. Firstly, a detailed introduction is given to the basic extension factor and the selection of relevant coefficient, and then the errors of such algorithm are analyzed. And the experimental result shows that the mathematical background of such method is relatively easy, the parameters are easy to control and constitute, and the generation of arbitrary polygon is available with high precision. Such the parametric equation of random polygon and method can be used in relevant fields such as geometric modeling, CAD/CAM, and computer graphics.
A GA Approach for Damage Localization Using Scattered Lamb Wave
Authors: Cai Chen Ning , Yan Gang
Published: March 2013

This paper presents a genetic algorithm (GA)-based approach for localizing damage in plate-like structure. Diagnostic Lamb wave is excited into structure before and after damage to obtain scattered wave that contain characteristic information of the damage. After the time-of-flight (ToF) of the scattered wave in each actuator-sensor path is measured by continuous wavelet transform (CWT), a GA optimization procedure is developed to adaptively identify the location of damage without knowing the material properties a priori. It is achieved by minimizing the difference between the measured and calculated ToF of the scattered Lamb wave. Experimental study for an aluminium plate is conducted to validate the proposed damage localization approach.
Determining Side-Cores of Plastic Moldings
Authors: Lin Alan C. , Anh Son Tran
Published: March 2013

The determination of side-core for plastic moldings plays an important part in design process. Numerous studies have been investigated for side-cores recognition in literature. However, most of the existing methods have been developed based on the side-core surfaces of one region are known. In fact, it is difficult to identify relevant surfaces of one region. This study proposes a new algorithm of relevant surface attribution (RSA) based on topological relationship and V-map to automatically identify relevant surfaces of a side-core region. Then, the proposed approach defines the shape of side-core region as bounding surfaces and side-core direction. Finally, case studies are used demonstrating the applicability and usage of proposed approach.
Sensitivity Analysis of the Influences of Rock Mechanical Parameters on the Deformation of Underground Caverns
Authors: Chen Fang Fang , Zhang Zhi Qiang , Li Ning
Published: March 2013

The Main factors affecting the stability of underground caverns are selected, including the rock mechanical parameters (elastic modulus, Poisson ratio, cohesion and internal friction angle) and initial ground stress parameter (lateral pressure coefficient). Numerical test method is adopted to analyze each parameter’s sensitivity to surrounding rock displacement. Sensitivity formula making each values comparable is established. The sensitivity distribution laws are obtained, and then each parameter’s quantitative effect on displacement is discussed. This work has prominent guiding significance to engineering designs.