bluuebunny/crossref_metadata_2025 huggingface dataset:
Friction and Wear Behaviors of Copper Rubbing against Carbon Material with and without Windy Conditions
Authors: Ding Tao , Li Yu Mei , He Qiu Dong , Xuan Wen Jing
Published: December 2012

An experimental study on friction and wear properties of carbon strip rubbing against copper contact wire was carried out on a pin-on-disc frictional tester with and without windy conditions. The result shows that wear rate of pin specimen increases observably with increasing sliding distance with and without windy conditions. While the coefficient of friction slightly decreases with increasing of electric current with and without the wind. Observing the SEM morphology of pin specimens, it can be found that delamination wear is a main wear mechanism under no windy condition. While arc erosion is a dominant wear mechanism with windy condition. Worn surfaces of the materials were analyzed by an energy dispersive X-ray spectroscopy. It can be observed that oxidation wear occurs in the frictional process due to arc erosion and high temperature rise.
A New Numerical Method for Solving the Heat Conduction Equation in One Dimensional Nanometer Materials
Authors: Liu Jia Chun , Wang Pei Chen
Published: December 2012

In order to obtain the numerical solution of the heat conduction equation in one dimensional nanometer materials, we discrete the demand equation by Galerkin-Legendre spectral method and obtain a system of order ordinary differential equations, then we solve this system by using a ﬁfth order ﬁve stage A-stable new diagonally implicit Runge-Kutta method. Numerical results are presented to demonstrate the accuracy and efficiency of this method.
Elastic-Plastic Fracture Assessment for the Cracks Emanating from a Circular Hole under a Biaxial Loading Condition
Authors: Wang Z X , Liu R
Published: December 2012

In this study, elastic-plastic stress and strain fields were analyzed on hole-edge cracks in an aluminum alloy plate under the biaxial load. And the effects of the load parallel to the crack face on failure parameters were discussed. By quantifying the effects of the crack size and the loading mode on the crack propagation driving force, J integral, and the plastic limit load, the corresponding failure assessment curves of the hole-edge cracked plate were established with the new R6 failure assessment diagram (FAD) method. The result shows that the transverse load has a larger effect on the failure assessment curve than crack length does, the safety zone of the failure assessment diagram gradually becomes smaller while transverse loading stress changes from tensile condition to compressed. Especially, when the transverse load acts as pressure, the Option 3 failure assessment diagram results to a smaller safety zone than the Option 1 failure assessment diagram does.
Controllable Synthesis of Spheroid Hydroxyapatite Nanoparticles by Rverse Microemulsion Method
Authors: Fan Tao , Sun Yan Rong , Ma Li Guo
Published: December 2012

Spheroid hydroxyapatite nanoparticles were successfully prepared by titrating Ca(NO3)2•4H2O and (NH4)2HPO4 aqueous solution in the reverse microemulsion, which consists of mixed OP-10(surfactant), cyclohexane(oil phase), and isobutanol (cosurfactant).The structure and morphology of the prepared powders were characterized by means of X-ray diffraction (XRD) and transmission electron microscope (TEM). The optimum composition was investigated via the analysis of the aqueous solution conductivity, and the mechanism of aqueous reaction. The effect of the pH value and the amount of surfactant on the particle size were studied. The results indicate that the best conditions are which the concentration of OP-10 and isobutanol both are 0.2 M, when the water content is between 130 ml-250 ml，it results in pure nano-hydroxyapatite spheroid-like powders, and the water content is about 200 ml, whose diameters are 50 nm-80 nm, and good particle diameter distribution, the particle microstructure is homogeneous, good crystal structure and higher crystallinity.
Simulation and Experimental Research of Sheet Metal Defect Detection Based on Ultrasonic Lock-in Thermography
Authors: Qin Lei , Liu Jun Yan , Jiang Bin
Published: December 2012

Sheet metal is used widely, but the defect inside the sheet metal will affect the use security. Ultrasonic lock-in thermography as a nondestructive testing method can be used in defect dectection. This paper, focusing on the Q235 sheet metal, regards the heat conduction process as sound-machine-thermo energy coupling process, establishes the finite element simulation model, and experiments are performed to validate the built simulation model. The result shows ultrasonic lock-in thermography is fit for testing inside defects of sheet metal.
Research on Anti-Creasing Properties of 100% Cotton Yarns
Authors: Wang Yun Li , Chen Jun , Cheng Shan , Mao Zong Li , Dong Ming Min , Xu Wei Lin
Published: December 2012

Durable press (DP) finishing is the common process to impart anti-creasing properties to cotton fabrics. Conventionally, the whole fabric was treated by pad-dry-cure (PDC) process in one treating bath. However, this process led to the serious loss of the cotton fabrics in mechanical properties. In this work, the cotton yarns were treated with DP finishing solution. And subsequently, they were dried and cured in a certain temperature. The wrinkle recovery angle (WRA) of yarns was measured. The relationship between the treating process and WRA was studied. The affecting parameters on WRA were acquired by experiment. This work provides basic data for people to know and understand the role of anti-creasing yarns in the whole fabric.
Effect of Lithium-Doped on the Crystal Structure and Morphology of ZnO Nanorod Arrays
Authors: Liu Yang Lin , Duan Xue Chen , Liu Shu Yun , Liu Yan Yan
Published: December 2012

Lithium-doped zinc oxide(ZLO) thin films were deposited on glass substrates by sol-gel method.And then by controlling processing parameters such as the amount of doped lithium and stability, etc,Well-aligned ZLO nanorod arrays were successfully grown on substrates by hydrothermal method, where the substrates were spin-coated with seed layer.The experiments show the 5% Li-doped and diameter of about 50nm of ZLO thin films nanorod arrays has the best performance photoluminescence and surfactants can promote the growth of ZLO rod-like nano-structures and contribute to the formation of ZLO nanorod arrays with highly oriented.
Influence of Peeling Rates in the Nominal Bonding Strength between the Fabricated Composite and Stainless Steel Thin Film / Sheet
Authors: Liu Guo Ning , Zhao Hua Dong , Guo Qian Qian , Wang Li Xin , Ma Sheng Gang
Published: December 2012

Study here focuses on the efficient utilization of the advantages of organic polymeric materials such as their low mass density and high tensile strength, etc, and at the same time avoiding their disadvantages like low/soft stiffness and rapid deterioration of mechanical properties in the aggressive or corrosive environment. To realize this aim, one methodology is adopted in this work by introducing the stainless steel thin film or sheet in the design to improve the anti-corrosion behaviors of the fabricated composite. Mechanical tests are also carried out to measure the effects of peeling rates on the nominal bonding strength which is a key parameter to characterize and evaluate the reliability of the whole designed structure under various loading conditions. In this way, the applications of composites made of mainly organic polymeric materials may be extended to larger engineering areas. The influence of peeling rate over the bonding strength is also discussed.
Study on Elevated Temperature Impact Properties of 20MnSiV Steel
Authors: You Da Yong , Bai Yin Lan
Published: December 2012

The test of 20MnSiV Ⅲ grade reinforced bar is carried out at room temperature and other nine temperatures: 100°C、200°C、300°C、400°C、500°C、600°C、700°C、800°C、900°C.The results show that, the highest impact absorbing energy 137J appeared when the test temperature is 200°C, while the lowest is 75.5J when the temperature is 600°C. While the test temperature is over 700°C and the sample is near damaged, strain softening and serious longitudinal extension is happened in the course of impact, and the gap of the sample can not result in the concentration of stress-strain, fracture mechanism of the material is changed, and then impact absorbing energy had no practical significance.
On the Presence of Eta Carbide in the Cryogenically Treated High Speed Steel
Authors: Gogte Chandrashekhar , Peshwe Dilip , Paretkar Ravindra
Published: December 2012

The research in the cryogenic treatment of tool steels and other alloy steels is important as it causes substantial increase in the wear characteristics of alloy and tool steels. The present day research of this technology indicates precipitation of submicroscopic carbides referred to as eta carbides. This work comprises of reviewing the carbide types that form during heat treatment of high speed steels and presenting the results of the experiment for finding eta carbide in the cryogenically treated AISI T42 high speed steels using advanced microscopy. The results of this work indicate the contribution from the other secondary carbides (other than eta carbides) in the enhancement of wear characteristics in high speed steels.
Analysis and Practical Application of Extracting Vanadium from Hot Metal in Steel Ladle
Authors: Qin Jie , Liu Gong Guo , Li Zhan Jun , Qi Jian Ling
Published: December 2012

The thermodynamics and kinetics factors about ladle vanadium extraction are introduced firstly. According to the real production in the resources comprehensive utilization test pilot of Pangang, the causes of temperature controlling, shortage of oxygen supply as well as the difficult for slag skimming are all analyzed in detail and the solutions are put forward at the same time. Under the real production conditions, if controlling the temperature of molten pool between 1450～1500°C,keeping the bottom blowing smoothly, meeting the oxygen supply of 1400 Nm3/h and adding adequate coolant at better time it will get good vanadium extraction results
Effect of Ce on the Inclusions and Pitting Resistance of 2Cr13 Stainless Steel
Authors: Liu Xiao , Wang Long Mei
Published: December 2012

The anodic polarization curves of 2Cr13 stainless steel with various RE contents in 3.5% NaCl neutral solutions have been measured by electrochemical methods. The effect of Ce on pitting corrosion resistance of 2Cr13 stainless steel has been studied by the metallographic examination. The results show that sulfide and other irregular inclusions are modified to round or oval-shaped Ce2O2S and CeS after adding Ce to 2Cr13 stainless steel.Ce makes sulfide, and other irregular inclusions change to dispersed round or oval-shaped Ce inclusions, effectively inhibits the occurrence of pitting corrosion, thereby enhancing the corrosion resistance of 2Cr13 stainless steel.
Influence of Interfacial Bond Strength on the Mechanical Properties of Resin Mineral Composite Reinforced by Molybdenum Fibers
Authors: Wang Ze Ning , Zhang Jian Hua , Ren Xiu Hua , Wang Tao , Tian Xiao Quan
Published: December 2012

To improve the poor mechanical properties of resin mineral composite, molybdenum fibers reinforced technology and mechanism are researched. The micro-surface morphology of new and wire electrical discharge machining used molybdenum fibers are analyzed, and the cohesive reinforce mechanism is deduced respectively. Two-dimensional simplified finite element model of resin mineral composite reinforced by molybdenum fibers is established for the simulation analysis of bond-slip of interface between fiber and resin matrix. Tests on the internal stress distribution of resin mineral composite without fibers and resin mineral composite reinforced by molybdenum fibers are carried out. Research results show that the addition of molybdenum fibers can effectively restrict the deformation of composite, and the randomly distributed pits on the surface of wire electrical discharge machining used molybdenum fibers can enhance the strengthening effect and reduce the cost of composite.
Dynamic Recrystallization of 18Ni(1700MPa) Maraging Steel During Hot Deformation
Authors: Zhao Fei , Ren Yong Hai , Yan Yan
Published: December 2012

Dynamic recrystallization(DRX) behaviors of 18Ni maraging steel during hot deformation have been investigated by single-pass thermo-mechanical simulative experiment at temperatures of 1173K-1323K and strain rates of 0.001s-1-1s-1. The results show that the true stress-true strain curves type of this alloy is DRX. The DRX in 18Ni maraging steel is easy to occur at low strain rates and high deformation temperatures. Using regression analysis, the activation energy(Q) for DRX of 18Ni maraging steel was calculated to be 413544.96J/mol. The constitutive equation of peak stress for DRX was also obtained. The mathematical models of critical stress and critical strain were finally established.
Pressureless Sintering of B4C Neutron Absorbing Material with Nano-Sized Rare-Earth Compounds Addition
Authors: Wei Ru Bin , Zhang Yu Jun , Gong Hong Yu , Liu Xiao Jun , Jiang Ya Zhen , Zhao Yu Jun
Published: December 2012

The processing of boron carbide by pressureless sintering with nano-sized rare-earth compounds additives to obtain dense pellets for use as neutron absorber in fast breeder reactors is investigated. The effect of dysprosium aluminum garnet (DAG) and dysprosium titanate nanopowders on density and mechanical properties was studied. The addition of DAG and dysprosium titanate nanopowders was found to be beneficial in the densification of B4C powders. B4C with 5 wt. % of DAG or dysprosium titanate nanopowders, exhibiting bulk density of 2.14g/cm3 and 2.35 g/cm3, could be prepared by pressureless heating at 2120°C and 2160°C.
Study on the Synthesis of ZrAl3O3N and its Influencing Factors
Authors: Wu Guang Na , Wang Rong Lin , Feng Bin , Bu Jing Long
Published: December 2012

Synthesis process of ZrAl3O3N was investigated by non-pressure sintering at 1600 °C in N2 atmosphere according to five drafted equations. The influences of the atmosphere and material combination on the synthetic effect of ZrAl3O3N were preliminarily discussed by XRD. The results showed that atmosphere was a key factor that determined whether ZrAl3O3N could be synthesized, i.e. ZrAl3O3N could only be synthesized in high purity N2 atmosphere, and that ZrAl3O3N was only synthesized on condition that the raw material composition included both AlN powder and nano-ZrO2 powder. However, with increasing of AlN content, the XRD peaks of ZrAl3O3N and ZrN phase gradually reduced, and pure ZrAl3O3N was hardly obtained by in-situ reaction between AlN and ZrO2 because of generation of ZrN as well.
Influence of Mo Content on the Properties of TiC-Based Cermets
Authors: Wang Neng Wei , Tong Yan Wei , Fang Min Xian
Published: December 2012

The cermet prepared by powder metallurgy method is a new structural material. In this article TiC-based cermets prepared by using the vacuum sintered was described, the influence of the different Mo content of TiC-based cermets on the flexural strength and resistivity was discussed and analyzed from its structure and wettability of the Ni. The results showed that the Mo content was 10% in TiC-Ni-Mo cermet, that is, the ratio of Ni and Mo was 1:1, TiC-based cermet had smallest resistivity and higher flexural strength.
First-Principles Study on the Clean and Nb Doped TiO2(110)γ-TiAl(111) Interfaces
Authors: Hao Hui Nan , Wang Xu , Wang Fu He
Published: December 2012

In this paper, the structural stability, adhesion and chemical bonding of the TiO2 (110)/TiAl (111) interface are investigated by the first-principles calculations. We predict the maximum adhesion energy of 1.91J/m2 of the TiO2/TiAl interface. We also calculated the Nb doped interface, and found that the doped Nb atom prefers to replace the Ti atom at the second layer of TiAl slab. The atomic geometry and density of states are analyzed. The results show that the effect of doped Nb is localized and insignificant on the TiO2 (110)/TiAl(111) interface.
The Modification of Mesoporous Silica SBA-15-Type with PEG
Authors: Zhi Yu Yuan , Zu Lei , Gu Kai , Lian Hui Qin , Cui Xiu Guo
Published: December 2012

In this study, first we prepared SBA-15 and sulfonate bearing SBA-15-SO3H.Then we modified the mesoporous silica with PEG to get SBA-15,SBA-15-SH,SBA-15-SO3H,SBA-15-PEG and SBA-15-SH-PEG.The samples were tested by FT-IR, nitrogen adsorption–desorption and TG. The tests showed that both SBA-15and SBA-15-SO3H we prepared had the typical properties of mesoporous materials. SBA-15-PEG and SBA-15-SH-PEG were successfully prepared.
Effects of EVA-g-MAH on Mechanical Properties and Morphological Structure of TPU/PVC Blends
Authors: Huang Gao Shuang , Lin Song Bai , Zhang Qing Hai , Li Da Gang , Li Yun Long , Geng Zhi Jie
Published: December 2012

The effects of ethylene vinyl acetate grafting maleic anhydride (EVA-g-MAH )as a compatilizer on the mechanical properties, compatibility and morphological structure of thermoplastic Polyurethane and poly(vinyl chloride) blends were studied. The blends were prepared and characterized by mechanics properties test, scanning electron microscopy(SEM,)dynamic mechanical properties (DMA) and thermogravimetry(TG) . Mechanical properties indicate that the hardness, tensile strength, breaking elongation of the blends are greatly improved by EVA-g-MAH, when the critical EVA-g-MAH content at about 4 wt%.SEM micrographs reveal that EVA-g-MAH could bring down the diameter of dispersed , change brittle fracture into ductile fracture, and promote adhesion of phase interface. The glass transition temperature change by DMA proves that the addition of the EVA-g-MAH improved the compatibilization of blends. And the results of TG experiment show that EVA-g-MAH greatly improve the thermal stability of the blends.
Using Optical Image Real-Time Analysis Software to Characterize Polymer Processing
Authors: Xian Guang Ming , Qu Jing Ping , Huang Ai Yi
Published: December 2012

A special optical approach for the study of polymer melts in a slit die is presented in this article. A light scattering imaging system, which is the most suitable for digital evaluation of flow field of polymer melts, is put forward. Bright image of polymer melts against in dark slit die which is suitable for binary processing can be obtained by the CCD. Optical image real-time processing software for recording light intensity matrix at different screw rotate speed and for computing maximum intensity projection area has been developed. And the relationship between maximum intensity projection area and vibration frequency can be predicted by the software. The technique allows the visualization of the light scattered by optical image real-time analysis software to characterize polymer processing. The software brought the qualitative analysis of the flow field of polymer melts success.
Flocculation Effects of Hydrophobically Modified Polyacrylamides for Tailing Slurry
Authors: Wu Da Ping , Zhu Li Na , Sun Yan Lin
Published: December 2012

The hydrophobically modified polyacrylamides (PAM) were synthesized using butyl acrylate (BA) and methyl methacrylate (MMA) as hydrophobic monomers, via water solution free radical copolymerization. The influences of hydrophobic monomer content on the molecular weight, insoluble fraction and dissolution rate of PAM were investigated. The flocculation effects of PAMs for two kinds of tailing slurry with difficult sedimentation feature were also evaluated. The results show that different flocculation effects of hydrophobically modified PAMs can be obtained according to different kinds of tailing slurry.
Research on Particle Size and Luminescence Properties of GdBaB9O16: Eu3+Phosphor Prepared by Sol-Gel Method
Authors: Xie Ying , Xiao Lin Jiu , Chen Yong Jie , Li Wen Ze , Geng Xiu Juan
Published: December 2012

Gd0.6BaB9O16: Eu3+0.4 red phosphors were prepared by sol-gel technique. The different polyethylene glycols (PEGs) were added to control the particle size ofGd0.6BaB9O16: Eu3+0.4. The particle distribution and the relationship between the particle size and the luminescence properties of the phosphors were investigated. PEGs have no influence on the structure ofGd0.6BaB9O16: Eu3+0.4, but the particle size is changed with different molecular weight of PEGs. And the relative intensity of excitation peak and emission peak ofGd0.6BaB9O16: Eu3+0.4phosphor are reduced by adding PEG, due to the particle size effects.
Fuzzy Ball Drilling Fluids for CBM in the Ordos Basin of China
Authors: Li Zuo Chen , Zhang Zhi Heng , Zhan Liang , Cai Jia Rong
Published: December 2012

Fuzzy ball drilling fluids have been developed in order to effectively control lost circulation during CBM drilling. Depending upon fuzzy balls and colloids in fuzzy balls, the fuzzy ball drilling fluids changed their shapes and properties to completely plug underground heterogeneous seepage channels so as to strengthen the pressure bearing capacity of formations. This paper describes the available features of the fuzzy ball drilling fluid including efficient plugging, good carrying and suspension, formation damage control, compatible weighted by any weighted materials without auxiliary equipment. The fuzzy ball drilling fluids can finish drilling in low pressure natural gas zone, control CBM leakage; control the natural fractures, drilling in different pressures in the same open hole, combination with the air drilling mode, etc. during Ordos CBM drilling. The fuzzy ball drilling fluid will not affect down-hole motors and MWD. The fuzzy ball drilling fluid will be blend simply as conventional water based drilling fluids. The existing CBM drilling equipment can completely meet the fuzzy ball drilling mixing and it is maintained conveniently. The fuzzy ball drilling fluid is the efficient drilling fluid.
Investigation and Evaluation on the Moisture-Absorption and Quick-Drying Properties of Stitch-Bonded Nonwoven Fabrics with Hemp/Polyester Blended Used in Shoe’s Lining
Authors: Hao Xin , Hao Xin Min , Zhang Jian Chun , Li Hong Wei , Zhang Gun Jun , Wang Fei , Yang Yuan
Published: December 2012

Micro-environments of shoes chamber after strenuous exercise were simulated by using self-made experimental device. Under the different conditions of temperature and humidity, moisture absorption, water transmissibility, water retention and moisture liberation of stitch-bonded fabrics with different content of hemp was tested. According to multiple properties of the moisture-absorption and quick-drying, tested performance of five aspects were used to build the evaluation system about it. TOP-SIS (Technique for Order Preference by Similarity to Ideal Solution) and coefficient of variation method can calculate the degree of closeness of actual values and ideal values so as to establish a comprehensive evaluation method. The results show that when content of hemp is nearly 40%, shoe’s lining of stitch-bonded materials can obtain high performance, which can meet the requirement for shoe’s lining.
Influence of Pressure of Electron Gas on Elastic Property of Metal
Authors: He Li Jun
Published: December 2012

A balloon filled with electron gas model was built to simulate metal for calculating its bulk elastic. Electron gas obeyed Fermi-Dirac distribution and satisfied with theory of ideal gas. Expression of metal bulk elastic modulus was derived, and the comparison between the new method given in this paper with current method according to theory of atom potential energy on calculation accuracy was also given. It showed that, pressure of electron gas closely related to bulk elastic modulus, and maybe it was the major factor in determining bulk elastic modulus of metal; not all of valence electrons of atom in metal became conduction electrons to form the electron gas; new model of present work is superior to traditional method based on calculating derivative of potential energy.
Time-Dependent Density Functional Theory Studies of Plasmons in Parallel Double Sodium Atomic Chains
Authors: Wang Bao Ji , Ke San Huang
Published: December 2012

The photoabsorption spectra of linear double Na atomic chains with different lengths and inter-chain spacings are investigated using the time-dependent density functional theory (TDDFT) in the frequency domain. The formation and development of the collective resonances in the spectra are studied in terms of the spacing and length. With the decreasing spacing, the enhanced coupling between the chains lead to the emergence of extra peaks. For the well coupled double chains, the excitations show a single longitudinal mode but twin bimodal structure for the transverse modes. Our calculation reveals the formation and evolution of plasmon excitations in atomic nanostructures.
Efficient Synthesis, Properties of a Novel Unsymmetrical Photochromic Diarylethene Based on Trifluoromethy Group and Formyl Group
Authors: Liu Gang , Liang Long , Jiang Duo Hua
Published: December 2012

An unsymmetrical diarylethene derivative was synthesized, and its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 599 nm in hexane and at 609 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 419 nm when excited at 309 nm. The fluorescence intensity is highest at the concentration of 5.0×10-5 mol/L when excited at 309 nm.
Synthesize, Photochromic and Application for Optical Recording of Diarylthene Bearing Naphthyl Unit
Authors: Cui Shi Qiang , Deng Min , Wang Ren Jie , Liu Gang
Published: December 2012

A new photochromic diarylethene bearing thiophene and naphtyl unit 1-(2-methyl-1-naphthyl)-2-[2-methyl-5-(2-cyanophenyl)-3-thienyl]perfluorocyclopentene (1o), was synthesized and its phtochromic, fluorescence, kinetics and optical recording properties were investigated in detail. This compound exhibited remarkable photochromism, changing from colorless to red after irradiation with 297 nm UV light both in solution and in PMMA film. Finally, using diarylethene 1c as recording medium, polarization optical recording was carried out successfully.
Decomposition of Organic Dye in Water through a Heterogeneous Fenton Process Catalyzed by Fe (III)-Grafted PTFE Fiber Complex
Authors: Ding Zhi Zhong , Dong Yong Chun
Published: December 2012

Fe (III)-modified polytetrafluoroethylene (PTFE) fiber complex was prepared with poly acrylic acid grafted PTFE fiber and FeCl3 aqueous solution and used a novel heterogeneous Fenton catalyst for the photo-assisted degradation of Rhodamine B in water. The results indicated that Fe (III)-grafted PTFE) fiber complex can significantly enhance the dye degradation at a wide pH media under light irradiation. Increasing Fe content of the catalyst, H2O2 concentration and visible irradiation intensity leads to a fast degradation. Moreover, UV light irradiation is much more effective than visible light irradiation for promoting dye degradation.
Effects of Hydrogen Evolution During ECE on the Bond Strength between Steel and Concrete
Authors: Deng Chun Lin , Xu Yun , Xiong Jian Bo , Wang Sheng Nian
Published: December 2012

Electrochemical Chloride Extraction (ECE) is a new method to halt the corrosion of steel in concrete contaminated by chloride. The bond strength between steel and concrete with and without ECE were tested through steel pull-out test, and the effects of current density and total charge passed during ECE on it were analyzed. A demo device was designed to analyze the hydrogen evolution during ECE by dividing the cathode reactions and anode reactions into two sealed bottles. The relation between hydrogen content and electrons passed in the circuit and the adverse effects of the hydrogen on steel reinforced concrete was conducted. Through drilling appropriate number of holes from concrete surface into the steel, some hydrogen can be released and its adverse effects can be mitigated in a certain degree.
Application of SHS-Refractories during Limestone Furnace Refurbishment
Authors: Fomenko Sergey M. , Dilmukhambetov E.E. , Mansurov Zulhair A. , Korkembai Zhanibek A. , Reshetnyak Aleksandr F.
Published: December 2012

This paper summarizes the results of the limestone furnace upgrade / refurbishment using the SHS-refractory material upon the furnace gas distribution coring.
Effect of Curing Method on the Strength Development and Freezing-Thawing Durability of the Concrete Incorporating High Volume Blast-Furnace Slag Subjected to Initial Frost Damage
Authors: Koh Kyung Taek , Ryu Gum Sung , Lee Jang Hwa
Published: December 2012

In the case of construction with high volume blast-furnace slag(BFS) concrete during winter season, the setting and hardening are drastically delayed, so it has a high risk of initial frost. Assuming that the concrete incorporating a high volume of BFS is affected by freezing at the early age during the winter conditions, then this study is to investigate the effect of curing method on the strength development and the resistance to freezing-thawing action. As a result, the concrete performing water curing at 5°C after subjected to initial frost damage improve the long-term strength and the freezing-thawing durability. The concrete implementing water curing at 30°C enhance the long-term strength and the resistance to freezing-thawing action as well as the early strength. However, the concrete with sealed curing at 30°C exhibits the improvement in the early strength, but not in the long-term strength and the freezing-thawing durability.
Effect of Quartz Powder on the Strength and Shrinkage of Alkali-Activated Slag Cement
Authors: Yuan Xue Lian , Fang Yong Hao , Gu Ya Min
Published: December 2012

Quartz powder with different fineness were added into alkali activated slag cement to reduce the drying shringkage of the hardened cement paste. Experimental results showed that partially replacing the slag powder with quartz powder will reduce the water requirement of normal consistency, dry shrinkage and early age compressive and flexural strength of alkali-activated slag cement (AASC), however, the flexural/compressive strength ratio and the fracture toughness will be increased and so does the later strength. The fracture section of specimen of quartz powder modified alkali-activates slag cement paste has a rougher texture than that of pure alkali-activates slag cement paste.
Development of New Type Cementitious Materials Using as Road Base
Authors: Chen Dong Mei , Zhang Ri Hua , Zhao Zhan Guo
Published: December 2012

At present, cement stabilization and sand are mainly used as Chinese road bases. Portland cement which causes shrinkage crack of road base can’t be suitable for construction requirements. One kind of new type cementitious materials of road base was developed to substitute for Portland cement by the construction requirements that the fly ash is the main raw materials. This product is not only suitable for construction requirements, but also reduces crack of road base for its suitable strength and micro expansive.
A Study of Relationship Between Residual Asphalt in Aggregate Surface and Aging Degree of its Asphalt
Authors: Liu Wen Tsung , Tu Ming Ho
Published: December 2012

Abstract. Laying the road, a lot of asphalt mixing plants use recycled asphalt concrete instead of fresh asphalt concrete. The main reason is that the plants don’t need to provide the viscosity inspection when testing because it is not mentioned in the contract. Even if the value of bitumen viscosity is high in the test report, it is difficult to prove effectively whether to join the asphalt recycled materials or not. This study is to explore the relationship between their extraction of bitumen and coarse aggregate cleanliness by Soxhlet extraction from asphalt recycled materials and fresh asphalt concrete. Besides, we look for the differences after washing asphalt. The research focuses on the method to view the number of the cleanliness on the coarse aggregate surface. The coarse aggregates will be divided into four kinds of sieve (3/4 ", 1/2", 3/8 ", # 4) in process. The selected range is by the built-in program of Photoshop_CS3. We determined the percentage of asphalt area on the aggregates in line with the RGB values. We further used the image processing techniques (Matlab program of image analysis) to assess the relationship of the above mention and compared the basic properties of the asphalt.
The Insights of Node Deployment for Localization Accuracy in Underwater Acoustic Sensor Networks
Authors: Zhang Chen Yu , Han Guang Jie , Zhu Chuan , Liu Tong Qing
Published: December 2012

Node deployment is a reflection of cost and performance in Underwater Acoustic Sensor Networks (UASNs). In this paper, we compared three different node deployment strategies, namely random deployment, grid deployment and tetrahedral deployment, on aspects of node number, end-to-end delay, localization accuracy, coverage and connectivity. Simulation shows that tetrahedral deployment strategy has the smallest localization error. As connectivity is to be ensured, coverage can be reduced depending on the ratio of r/s.
Application of Self-Calibration in Flatness Assessment
Authors: Guo Tian Tai , Wang Xiao Xiao , Zou Hui , Hong Bo , Zhao Jun , Kong Ming
Published: December 2012

A self-calibration algorithm is described that allows the separation of the flatness error of two-dimensional profiling stages through the combination with a flat artifact whose accuracy is unknown. The calibration requires performing three independent measurements with different orientations of the same artifact to make mathematical models. Then the self-calibration algorithm was simulated using Matlab. The simulation results show that when there is no random measurement noise, this algorithm can realize exact calibration of the flatness error of the stage, while in the presence of random measurement noise, the algorithm introduces a calibration error of about the same size as the random measurement noise itself.
A Study on Drive Capstan Stiffness of Cable-Driven Picking Manipulator
Authors: Luo Hu , Tang Yong Gang , Shen Jun
Published: December 2012

A mathematic model of capstan drive stiffness is presented. The influence of preload force, coefficient of friction, wraps of cable and load on the transmission stiffness of a differential cable-driven picking manipulator is analyzed. It is shown that capability of transmission, loads and precision can be considered comprehensively in the design of drive capstan.
Structural Vibration Control of the Magnetic Flywheel Based on GA-PID Neural Network
Authors: Fu Hong Ya , Liu Ping Fan , Zhang Qing Chun , Li Guo Dong , Dong Di Bo
Published: December 2012

To overcome the difficult in modeling the mode theory for magnetic flywheel, by non-parametric frequency domain identification method for identification of system model, this paper select the PID neural network nonlinear intelligent control methods based on GA. Used a method based on iterative process to suppress the resonance, combined with zero-pole theory, this research designed a GA-based PID neural network identification controller to address the modal vibration suppression problems in the external rotor flywheel .The experiments for this paper proved the effectiveness of iterative process, and the controller can restrain the system mode vibration well.
Innovative Design of Portable Public Transport System for University Students
Authors: Xu Jiang Hua
Published: December 2012

Universities have a large flow of students, decentralized campuses, and functional areas are far away from each other as a result of continuous development of higher education and the expanding of college enrollment. Students’ studying and living are in great inconvenience. Portable public transport system will offer students travel convenience on campus. In the article analysis is conducted on the importance of the micro-bikes and electric scooters as a prototype vehicle on campus for students and on public facilities and management systems. The "long-term lease" and "rent at request" mode of operation is proposed. The establishment of portable public transport system has great significance for the construction of a harmonious campus.
A Vibration Analysis and Evaluation System Construction Based on On-Line Inspection
Authors: Xia Yan Chun
Published: December 2012

Vibration analysis(VA) is a very important method in the industry inspection application. Based on ISO10816, the severity level, certainty rating, the total risk rating matrix and the risk assessment index were proposed in the paper. Based on the testing samplings in a certain company and the assessment system established above, the VA analysis can be conducted and it is a good method for applying the predictive maintenance in the plant.
Vibration Transfer Analysis of High Speed Train Considering Car body Flexibility
Authors: Chen Tian Li , Zeng Jing , Lu Yao Hui , Zhang Li Min
Published: December 2012

In order to research the influence of the flexible car body on the vehicle system dynamic performance and to achieve the reasonable match between high speed and lightweight，it is necessary to build vehicle system dynamic model with the rigid car body replaced by the flexible car body. Due to the lower structure natural vibration frequency of car body, the influence of carbody flexibility on vehicle system dynamic performance is more influential. The influences of structural vibration of car body on vehicle system dynamics performance were studied by finite element analysis (FEA) method and multi-body system (MBS) dynamics theory. Rigid-flexible coupled vehicle system dynamic models were built up and the car body key location’s vibration was analyzed through vibration transmission chain. The results show that the influences of high speed carbody structure vibration on vehicle system dynamics performance are distinguished especially in the domain of car body natural vibration frequency.
Analysis on Structure Stress Characteristics of Top and Low Slewing Frame of Tower Crane
Authors: Li Bin , Liu Hong Da , Cai Bing , Song Zhong Liang
Published: December 2012

This paper is carried out the analysis on structure stress characteristics of the top and low slewing frame of ST6020 tower crane, and gets the stress contours under different working conditions. According to the stress state of the structure and the adjustments of the structure scheme, rational structure of the top and low slewing frame is obtained.
Transmission Study on Dynamic Characteristics of Front Suspension LCA Bushing
Authors: Peng Li En , Guo Rui
Published: December 2012

This paper simplified the wheel-Lower Control Arm-frame system into a two DOFs vibration system and analyzed its transmission characteristics by modeling the LCA rubber bushing in Kelvin-Voigt model, Zener model and Berg model, respectively. The results show that the system with Berg model shows obvious amplitude-dependent characteristics. Its magnitude and frequency at the peak of the transmission curve change as the excitation amplitude changes. The system with Kelvin-Voigt model or Zener model shows none amplitude-dependent characteristics. It’s more effective and more exact to model the LCA rubber bushing in Berg model than the others.
Modal Experiment and Analysis of Needle-Punching Machine
Authors: Tang Zi Long , Yuan Jian Chang
Published: December 2012

Modal analysis is a main method of researching the dynamic performance of the system structure. The deformation of Needle-punching machine frames in the work will affect the whole machine performance, which would seriously influence acupuncture frequency, reduce production efficiency. At the meantime, machine life will be shortened. Here, Needle-punching machine modal experiment has been done, the static natural frequencies and modal deformation animation of frame also has been calculated, that provides a reliable guide and basis for the actual work of deformation for needle-punching machine.
Influence of Top-Structure Form of Tower Crane on the Factor for Hoisting a Grounded Load
Authors: Xia Yong Jun , Mei Wen Ming , Miao Qian
Published: December 2012

Tower crane is a kind of construction machinery which be widely used in building, bridge, electric power construction. The factor for hoisting a grounded load is one of main factors for dynamic analysis and structure design of tower crane. Different structural forms of tower crane have different effects on the factor for hoisting a grounded load. The finite element models of QTZ125 tower crane with different top-structure form are build and the first six order inherent frequencies and vibration modes are analyzed. Then the factors for hoisting a grounded load at lifting velocity of 0.2~0.5m/s under lifting operation condition are calculated. Based on the results, the influence of the different top-structure of the tower crane to the dynamic characteristic and the factor for hoisting a grounded load is prominent, and the factor for hoisting a grounded load of support-rod type tower crane is less than the tower-cap type tower crane.
Research on the Dynamic Characteristic of the Bogie in Dynamic Track Stabilizer on Working Conditions
Authors: Wang Li Hua , Liu Guang Wei , Huang Ya Yu
Published: December 2012

With the large-scale speed-up of the railway, the dynamic track stabilizer will play an important role on the track overhauling and railroading of new line in our country. Bogie is one of the major critical components of the dynamic track stabilizer; its vibrating characteristic will affect the vibrating characteristic of the dynamic track stabilizer directly. The method of numerical simulate was used, based on ADAMS simulation, the horizontal exciting forces of the vibration exciter under working conditions were gained. Then the exciting forces were loaded on the bogie, and the dynamic characteristics of the dynamic track stabilizer bogie under the working conditions were obtained on the bases of the ANSYS/LS-DYNA. The analysis results show that the lateral and nod vibrating characteristics of the bogie under working conditions were strong. The analysis results of this paper will provide foundation for the research on the dynamic characteristics and working security of the dynamic track stabilizer.
Dynamic Analysis of a Free-Free Beam
Authors: Han Guang Cai , Wu Yan Hong , Bian Fu Guo , Liu Chao
Published: December 2012

The dynamic problem of a free-free beam with lumped masses distributed along the beam is researched. Effects of magnitude and position of lumped masses on bending mode and natural frequency of a free-free beam is studied. Method of lumped masses proposed in this paper is used to determine dynamic bending curves and natural frequencies. Least square method is used to give function fitting of the bending curves. The dynamic equations of a free-free beam are established by Lagrange method. Numerical simulation for dynamic response of the beam is carried out by MATLAB. The simulation results show that an impulsive load applied on the center of mass of the beam will result in small bending stress. However, a given larger impulsive load acting on one end or two ends of the beam will cause larger bending stress and plastic deformation at a cross-section and result in final failure.
Research on Involute Master Measuring Apparatus
Authors: Liu Qiang , Ma Yong , Ling Si Ying , Wang Qi Ming
Published: December 2012

The involute cam–baffle is one of the most important precision components in generating motion types of the gear grinder (such as Y7125). In order to meet the requirement of grinding ultra precision master gear, the high-grade involute master measuring apparatus is designed. The apparatus meets the continuous scanning measurement principle and the forming principle of the involute. According to evaluate the uncertainty components, the measurement uncertainty of the involute master measuring apparatus is 0.45 m. Finally a measuring experiment for an involute cam is conduced, the measuring results show that the total profile deviation is not more than 0.6 m and the profile form deviation is not more than 0.4 m. The experimental results show that apparatus has the capability of measuring high-grade involute master and high precision of involute cam.
Research on Maximum Wind Energy Capturing of DFIG
Authors: Song Hai Hui , Tian De
Published: December 2012

The doubly fed induction generator(DFIG) has been widely used in wind power generation system. It can alters speed of the rotor according to change of the wind speed, then contains the maximum tip speed ratio, in order to capture the maximum power from the wind energy. And the output frequency will not chang with the speed of generator. This paper studys the maximum wind energy capturing of DFIG. The theory analysis and simulation results based on MATLAB/Simulink demonstrate this control strategy is convenient and efficient.
The Research of Internal Fluid State Influence in the Divergency of the Straight Cone-Shape Draft Tube
Authors: Lin Yu , Han Shu Ren , Zhang Deng Cheng
Published: December 2012

The fluid state of the straight conical draft tube is simulated by using Fluent software. The distributing condition of the axial pressure and flow speed inside the straight conical draft tube is analysed and the recovery coefficient of the corresponding running condition is calculated, when the diffused angle is changing.
A Human Half-Top Kinematic Motion Tracking System Based on Disparity Information of Stereo Camera
Authors: Kim Youngouk , Jun Sewoong
Published: December 2012

This paper presents a new real-time system to acquire motion information of human articulated objects such as arm and head. The system does not need any marker or device to wear on human body and adopted stereo camera to obtain robust system against for illumination and complex background without position initialization of articulated objects. We present a solution to estimate self-occluded body objects when human model behaves normal action towards the camera. The main idea of the solution is to apply a component labeling techniques on sliced disparity map, and found the arm position when the arm is located in front of basis distance of body and we could also found arm location when the arm is located on the basis distance with Morphological methods. From this approach, we can obtain the full body shape considering self-occlusion. It is simple and fast in comparison with other methods which satisfy real-time performance and accuracy of object tracking at the same time.
A DSP-Based Control System for Precision Variable Rate Fertilization
Authors: Tang Xiu Ying , Chen Yi Zhe , Peng Yan Kun , Wang Xiu , Xu Yang , Yang Wei Long , Wang Wei
Published: December 2012

A real-time control system with TMS320F2812 DSP microprocessor as a control core for precision variable rate fertilization was designed, which were composed of the power system, DSP microprocessor controller, executive mechanism for variable rate fertilization, data storage module, speed test module and human-computer interaction module. A human-computer interaction interface system based on data storage and graphics was developed and the main control program was programmed. When the control system is working, the fertilizer rate is firstly entered by human-computer interaction interface, nextly the fertilizer rate and speed information are read into the DSP controller, and then the speed information is transmitted to monitor, finally the output pulses needed by motors are calculated, so the fertilizer rate can be controlled accurately. An experiment was conducted in the laboratory environment. The results showed that the error of fertilization rate of each fertilizer element was nitrogen (N: 0.05%), phosphorus (P:0.73%) and potassium (K:1.16%) respectly, and the consistency variability coefficient of fertilization rate of each fertilizer was nitrogen (N: 0.31%), phosphorus (P: 0.32%) and potassium (K: 0.15%) respectly. The control system for precision variable rate fertilization has high precision, good reliability and stability.