bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Bath Temperature on the Adhesive Strength and Bioactivity of TiO2 Nanotube Arrays
Authors: Xiao Xiu Feng , Tang Hai Zhen , Ouyang Ke Guan , Liu Rong Fang
Published: July 2012

The effect of bath temperature on the morphologies, crystallographic structure and adhesive strength of TiO2 nanotube arrays fabricated by electrochemical anodization of titanium in dimethyl sulfoxide containing hydrofluoric acid electrolyte were studied in this paper. The results show that the crystalline anatase TiO2 nanotube arrays can be directly fabricated at the bath temperature above 50oC without further annealing. The crystallinity of anatase at the top of nanotubes is higher than that at the bottom of nanotubes. The bath temperature has obviously impact on the surface morphology of the titanium substrate underneath the nanotube arrays. The adhesive strength of TiO2 nanotube arrays increases with the rise of bath temperature increasing, and reaches 11.3 MPa when TiO2 nanotube arrays are fabricated at 60 oC.
Mechanical and Rheological Properties of Compatibilized LDPE/Wood Flour Composites
Authors: Luo Wei Hua , Wang Zheng Liang , Liu Xing Xing
Published: July 2012

LDPE-g-MAH copolymer is prepared through reactive extrusion, and then added to LDPE/wood flour (WF) composites. Effects of LDPE-g-MAH and WF content on mechanical and rheological properties of LDPE/WF composites were investigated by melt flow rate (MFR), mechanical testing and advanced rheometric expansion system (ARES). Results show that the tensile strength of the composites increase with the increase of WF content, but the MFR value and elongation at break decrease tremendously. The tensile strength, impact strength, complex modulus and viscosity of the composites all show an increase with the application of LDPE-g-MAH on account of the enhanced interfacial adhesion. The abrupt ascent in the complex modulus of the LDPE/WF (70/30) composite when the shear rate reaches a definite value may denote changes in the aggregation structure of WF in LDPE matrix.
Performance Study of Nano-TiO2 Modified Fabric
Authors: Chen Xiao Mian , Shi Jing Jing , Su Hong Sha , Lin Chun Ting , Yang En Long
Published: July 2012

The catalytic properties of nano-TiO2 modified fabric suits the demand for self-cleaning in recent years. In this paper, advanced and innovative technology were used to synthesize water sol of titanium dioxide photocatalyst with high catalytic activity for fabric finishing. The wear behavior, antibacterial property and water repellency of treated and untreated fabric were tested. Results indicate that finishing and washing of the titanium dioxide had no effect on wear behavior; finished and washed fabric has a certain antibacterial and water repellent properties.
Study on Wheat Straw Reinforced FGD Gypsum-Fly Ash Block
Authors: Zhu Jiang , Li Guo Zhong
Published: July 2012

FGD gypsum, fly ash and wheat straw are taken as main raw materials; waterproof agent, water reducer, activator and composite retarder are chosen as admixtures, and wheat straw reinforced desulfurization gypsum block is produced through reasonable processing technology. Block ratios of material, processing technology and performance are analyzed.
Research on Refining Process of Synthetic Folic Acid
Authors: Liang Xue Song , Ma Chao Hua , Li Pei Xin , Liu Xiao Lian , Zhao Feng Qing
Published: July 2012

This article is mainly to investigate the factors on the refining process of folic acid. The appropriate refining process (complex refining combined acid followed by alkali treatment) was proposed. The synthetic crude folic acid was treated firstly with sulfuric acid with the concentration of 30%, then re-purified with sodium hydroxide to give folic acid with the purity of 97% and total yield of 51.3%. Higher temperature (80-100°C) is desired for the crystallization of folic acid. The product treated in this process meets the requirements of CP, USP and BP.
Study on the Properties of Physical and Chemical Foaming Concrete
Authors: Li Qi Jin , Li Guo Zhong , Jiang Cong Cong
Published: July 2012

Foam concrete samples with different density were prepared by physical and chemical foaming method respectively, and the demoulding time, 24h water absorption, mechanical properties and internal bubble holes structure of physical and chemical foaming samples were determined and compared. The result showed that the lowest dry density of physical foaming samples could only reach about 280 kg/m3, or there would be bubble collapse phenomenon after samples moulded; When samples dry density were about the same, compared with chemical foaming samples, physical foaming samples had longer demoulding time, significantly lower 24h water absorption, higher 3 days compressive and flexural strength and much better internal bubble holes structure.
Melting Temperature of Al2O3 under Pressure
Authors: Zhang S.
Published: July 2012

The melting temperature-pressure phase diagram [Tm(P)-P] for corundum (Al2O3) is predicted through the Clapeyron equation where the pressure-dependent volume difference is modeled by introducing the effect of surface stress induced pressure. Al2O3has been employed to test the reliability of the model, because of its important role. Al2O3has been extensively investigated because of its widely ranging industrial applications. This includes applications as a refractory material both of high hardness and stability up to high temperatures, as a support matrix in catalysis.
Study on the Property of Bi2(Mg2/3Nb1.1833Sn0.15)O7 Dielectric Ceramics Doped with Li2CO3
Authors: Hua Hai Tang , Huang Xin You , Zhu Zhi Wen , Hua Yin Qun , Li Yan
Published: July 2012

(Bi2-xLix) (Mg2/3Nb1.1833Sn0.15)O7 piezoelectric ceramics were prepared by conventional solid state reaction method. The microstructure and dielectric properties of dielectric ceramics were studied which was doped by different amount of Li2CO3. The experiment results showed that the density of the ceramics would decrease, but have little effect on the microstructure of the ceramics when the amount of the Li2CO3 doped increases. With the increasing of Li2CO3 doped, the dielectric constant(εr) and dielectric loss(tanδ) of dielectric ceramics first decreases and then increases. When tested in 1MHz frequency, the piezoelectric ceramics display the optimum properties tanδ is 0.00009, εr is 163 while Li2CO3 doped amount is 0.05 mol%.
Study on Anti-Corrosion Performance of 20A & 316SS in Circulating Cooling Water with Different Concentration Ratio
Authors: Zhong Ding Ping , Juan Kang , Gao Fan , Zheng Heng
Published: July 2012

The corrosion behaviour on 20A carbon steel and 316SS in cooling water were studied through weight-loss measurements in different concentration ratio condition. The results obtained from this study showed that inhibitors played obviously effective role for 20A material, while inhibitors had no any positive effect to 316SS material; and concentration ratio 3~7 range was suitable for protecting both 20A and 316SS materials in power plant.
Influences of Hydrogenation on Tensile Properties of Ti40 Alloy
Authors: Zhang Xue Min , Zhao Yong Qing , Zhang Peng Sheng , Chen Yong Nan , Zhang Feng Ying , Tian Xiao Dong , Li Yi
Published: July 2012

The influence of hydrogenation on microstructure and tensile properties of Ti40 alloy has been investigated. The microstructure observation reveals that a new phase called η phase with FCC structure appears at the grainboundaries when the hydrogen content above 0.3 wt.%. With increasing hydrogen contents, the strength first increases and then decreases, and the ductility decreases as the specimens tensioned at both room temperature and 700oC. These phenomenons are resulted from the solution strengthening of hydrogen addition in Ti40 alloy with single β phase. As the hydrogen content increases, the fracture mode changes from dimple to cleavage fracture for specimens tensioned at room temperature. When tested at 700oC, the morphology of fracture surfaces in the specimens are all characterized by polygonal grains and the fractograph exhibits typically “sugar candy” brittle fracture for the specimen with 0.5wt% H.
Semi-Dry Desulfurization Ash Modification and Application in Autoclaved Brick
Authors: Fu Ying Li , Mu Yan , Zhao Feng Qing
Published: July 2012

The modification of calcium sulfite in semi-dry desulfurization ash was studied. By the combining use of catalyst and oxidant, the content of calcium sulfite in the modified desulfurized ash was greatly reduced. In this way, the calcium oxide and calcium sulfate in the modified desulfurization ash were used to partially replace the lime, gypsum and other materials in the process of autoclaved brick production. The hydration reaction mechanism was discussed.
Study on Leakage Rate of HDPE/Paraffin Composite for Phase Change Materials
Authors: Liu Huan Rui , Yang Wen Bin , Pu Xin Yi , Zhang Kai
Published: July 2012

Based on high density polyethylene (HDPE) as supporting and encapsulating materials, paraffin wax as energy storage materials, HDPE/paraffin composite for phase change materials was prepared in the paper. In order to low leakage rate of HDPE/paraffin composite for phase change materials, the influencing factors of leakage rate of HDPE/paraffin composite, such as temperature of mixing, time of mixing, different content of DCP, rate of cooling, were studied. The results indicated that low leakage rate of PCM could be prepared.
Influence of Different Modificatior on Structure and Mechanical Properties of Liquid Forging Aluminum Alloy
Authors: Li Hong Bo , Su Xing Jun , Li Chun Jie , Li Tian Sheng , Xu Hui
Published: July 2012

Based on the experiment,the forming properties of Aluminum alloy in liquid forging was studied by adding rare-earth metal Y (Yttrium) modificatior and ternary modificatior(25% NaF +62% NaCl +13% KCl).The structure and mechanical properties of the prepared samples under two modifications were compared.The results showed that the rare-earth metal Y can modificatior liquid aluminum alloy forging a comprehensive mechanical properties of a substantial increase, the use of rare-earth metal Y (Yttrium)modificatior was better than ternary modificatior.
Research Progress on Binder of Activated Carbon Electrode
Authors: Zhang Ying Jie , Guo Jia , Li Ting
Published: July 2012

The activated carbon electrode has been widely used as an electrode material in capacitive deionization (CDI). The binder of activated carbon electrode has important influence on the electrochemical properties and structures of the electrodes. The effect of binder on the conductivity and capacitance of the electrodes is discussed in this article. And the structures characteristics of electrodes by adding different kinds of binder are summarized. The electrodes have higher capacitance and specific surface using polyvinylalochol (PVA) and sulfosuccinic-acid (SSA) as hydrophilic binder, comparing with hydrophobic binders include phenolicresin, polytetrafluoroethylene (PTFE) and polyvinylidenefluoride (PVDF). Therefore, activated carbon electrodes consisted by PVA and SSA are expected to become the future hot spot. The study of this paper has special significance to the choice and application of the binder in capacitive deionization.
Influences of Processing Parameters on Dilution Ratio of Laser Cladding Layer during Laser Metal Deposition Shaping
Authors: Zhang Kai , Zhang Xin Min , Liu Wei Jun
Published: July 2012

Laser Metal Deposition Shaping (LMDS) is a state-of-the-art technology that combines rapid prototyping and laser processing. There are many factors affecting the quality, precision, microstructure and performance of LMDS-deposited parts. Among them, dilution ratio is a significant one since it is not only an important index to judge the laser cladding quality, but directly affects the interlayer bonding strength and performance quality of as-formed metal parts. Thus, the substantial LMDS experiments were performed to conclude the influence of processing parameters on dilution ratio of laser cladding layer. The results indicate that the influence degree of scanning speed is most significant, while that of laser power is relatively slight. In order to ensure the perfect forming quality and strong metallurgical bonding, it is necessary to choose suitable dilution ratio to accomplish the LMDS process.
Effects of Processing Parameters on Powder Utilization Ratio during Laser Metal Deposition Shaping
Authors: Zhang Kai , Zhang Xin Min , Liu Wei Jun
Published: July 2012

The Laser Metal Deposition Shaping (LMDS) process involves injecting metallic powder into a molten pool created by a high power industrial laser. As the laser traverses across the substrate in a layer-by-layer fashion, a fully dense metal is left in its path. A few processing parameters involved with the LMDS include the laser power, traverse speed, powder feeding rate, and gas flow rate, etc, which affect many factors of LMDS technology. Among them, the powder utilization ratio is an important one because it directly determines the build rate and build height per layer. Due to some objective reasons, the powder utilization ratio is far less than 100%. In order to ensure the stability of LMDS technology, it is necessary to investigate the match between powder utilization ratio and build rate and forming efficiency, and grasp the influence rules of processing parameters on powder utilization ratio. Accordingly, the related experiments were performed with the varied laser power, scanning speed and powder feeding rate. The results prove that the powder utilization ratio is a varied value, and affected by the processing parameters. Consequently, the relative ideal parameter match should be chosen in accordance with the specific circumstances during the LMDS technology, thus ensuring the better powder utilization ratio and promoting the forming efficiency and economic benefit.
Study on Transportation of Cu(II) by Dispersion Supported Liquid Membrane System
Authors: Wu Xiao Ning , Yao Bing Hua
Published: July 2012

The transportation and separation of Cu(Ⅱ) through a dispersion supported liquid membrane(DSLM) consisting of 2-ethylhexyl Phosphonic Mono-(2-Ethylhexyl) in kerosene, supported on the polyvinylidene fluoride membrane(PVDF), is studied. The effects of pH value in the feed phase, volume ratio of liquid membrane phase and hydrochloric acid, concentrations of HCl in the strip phase and initial concentration of Cu(Ⅱ) in the feed phase are also researched. The results show that copper ion can be transported effectively when pH =5.25 in the feed phase, the volume ratio is160:40, concentrations of HCl in the strip phase is 4.0mol/L. Under the optimum transport conditions, when initial concentration of Cu(Ⅱ) was 2.00×10-4mol/L, the transport rate of Cu(Ⅱ)was up to 94.7% in 130 min.
Photocatalytic Performance of Co3O4 Prepared with the Assistance of Different Surfactants
Authors: Wang Tao , Li Jian Zhang , Wang Shao Hua , Zhong Jun Bo , Zeng Jun
Published: July 2012

In this paper, parallel flaw precipitation method has been employed to fabricate nanostructured Co3O4 with the assistance of different surfactants. It is found that the surface parameters, SEM image and photocatalytic performance of Co3O4 have a strong dependence on the type of surfactants. The prepared photocatalysts Co3O4 were characterized by BET, XRD and SEM. The results show that Co3O4 prepared with the assistance of sodium dodecylbenzenesulfonate exhibits the best photocatalytic activity among the experimented compositions. The surface parameters and SEM all play an important role in promotion of photocatalytic activity of Co3O4 prepared.
The Design of Soccer Robot Based on the Mechanical Analysis with Energy Materials
Authors: Li Yong Bo , Liu Hai Tao
Published: July 2012

This paper proposes a dynamical performance-ranking method to predict the relative performance of soccer robot based on the mechanical analysis with energy materials. Introduce Fuzzy-PID control arithmetic in the soccer robot control system apply, make some mechanical analyses, give control system hardware compose and software achieve method. The experiment result shows that the design of robot soccer system is stable, reliability is high, and expansibility is strong.
Finite Element Analysis of Large Space Shear Wall Structure
Authors: Zhou Li Jian , Shan Ming Kang , He Jin Zhou , Fan Yuan Gang
Published: July 2012

Established three-dimensional calculation model of three large space shear wall structures of different thickness, using finite element software ANSYS to calculate the seismic response analysis of these models,obtained time-displacement curves and stress distribution under earthquake structures of three large space shear walls of different thickness, and its comparative analysis; shows practical significance of large space shear wall structure.
Vibration Suppression of Manipulator with Multiple-Mode Negative
Authors: Huang Qing , Zhang Dan , Li Bing , Wei Yu Lan
Published: July 2012

The methodologies and application of multiple-mode negative impulses input shaping of a 3-DOF parallel manipulator with flexible intermediate linkages are presented in this paper. First, the structural system and the dynamic equations are expressed for a 3-DOF manipulator. Second, the multiple-mode negative impulses input shaping is introduced to reduce the residual vibration of the multiple-mode system and decrease the delay time of the system response at the same time. Finally, the theory of the multiple-mode ZV, ZVD and EI negative impulses input shapers are presented, and the two-mode negative impulses input shapers of a 3-DOF manipulator are established and compared with the positive impulses input shapers.
Effect of Preparation Conditions of Calcium Borate Nanoparticles on Oil-Solubility
Authors: Li Yong Qiang
Published: July 2012

Oil-soluble calcium borate nanoparticles were prepared in the presence of N2B4O7.10H2O, CaCl2 and oleic acid through in-situ modification method. The effects of five variables (pH value, the dosage of oleic acid, reaction temperature, the molar ratio of reactant and the dosage of absolute ethanol) on oil-solubility were investigated in detail. The as-obtained samples were characterized by infrared spectra (IR) and transmission electron microscope (TEM). It had been found that the average size is in the range of 50-200 nm. The results of the contact angle and active ratio indicate that the surface of calcium borate has been altered from hydrophilicity to hydrophobicity.
The Higher Order Asymptotic Crack-Tip Field for Reissner’s Linear Functionally Graded Shell
Authors: Dai Yao , Zhang Lei , Liu Jun Feng , Chong Xiao , Chen Hong Qian
Published: July 2012

The eigen-problem of a crack in functionally graded Reissner’s spherical shell is analyzed. By adopting the asymptotic expansion method, the higher order crack tip asymptotic fields which are similar to the Williams’ solutions of plane crack problems in homogenous materials are obtained. The grade direction is assumed to be parallel to the crack. The results can be widely adopted in numerical analysis, experimental investigation and the engineering application of FGM shell structure.
The Analysis of Large Space Shear Wall Structure under Wind Load Force
Authors: Zhou Li Jian , Shan Ming Kang , He Jin Zhou , Fan Yuan Gang
Published: July 2012

This paper established three-dimensional calculation model of three large space shear wall structures of different thickness,using finite element software ANSYS to analyze the wind loads and vertical loads of the internal force. And analyze the displacement, internal force distribution pattern. Under the wind loads and vertical loads of three different thickness wall of the large space wall structure.
An Investigation of Tooth Wear Diagnosis of Gear Based on Process Systems Modeling
Authors: Wang Feng Li , Xing Hui
Published: July 2012

Targeting the advantages of local wave analysis(LWA) and the characteristics of gear fault vibration signals, LWA is introduced into gear fault diagnosis. The concept of the instantaneous energy in time- frequency analysis, based on local wave time-frequency spectrum, was used to measure the energy distribution of the signal in time-frequency domain. Furthermore, when tooth wear occurs in gear, the energy of the gear vibration signal would change correspondingly, whilst local wave time-frequency spectrum can exactly provide the instantaneous energy distribution of the signal with the change of the time and frequency. Thus, the fault information of the gear vibration signal can be extracted effectively from the local wave time-frequency spectrum. The analysis results from the experimental signals show that local wave time-frequency analysis could extract the characteristics information of the gear fault vibration signal effectively.
Cutting Test Research for Coated Carbide Cutting Tools
Authors: Hu Xiang Yin , Hu Yan Hui , Li Xiao Jing
Published: July 2012

A coated carbide cutting tool with its high hardness and high wear resistance, good chemical stability and extensive compatibility characteristics, is widely applied in the metal cutting processing field. It is one of the cutting tools, belonging to the current focus research and development project of all countries in the world. The author mainly studies the cutting force contrast between coated carbide cutting tools and not coated ones. At the same time study them on the rake face friction coefficient contrast and the chip deformation coefficient contrast so as to explain the reasons for coated cutting tool cutting force decrease. The research indicates that, in machining course, applying physical vapor deposition coated technology (PVD) of carbide cutting tools cutting force change with feeds, cutting depth and speed is the same as not coated carbide cutting tools. But coated carbide cutting tools cutting force is obviously less than that of not coated carbide cutting tools. The main reason is that the friction coefficient between the two kinds of cutting tool materials and the workpiece is different. The result of study will help popularization and application of coated carbide cutting tools.
Vibration Modal Analysis and Structural Optimal Design of Car Rear-View Mirror Based on ANSYS
Authors: Zhang Zhi Ping , Liu Han Wu , He Wen Tao , Gao Yong Hui
Published: July 2012

In order to improve the safety of the moving car,we have to make simulation and analysis of the dynamic characteristics of the car rear-view mirror. We should consider, in addition to the geometric dimensions, standards and demands, a reasonable choice of the mirror size and installing position, the dynamic characteristics of the car rear-view mirror in the design of the car rear-view mirror. In this paper, we use the finite element software ANSYS to simulate the vibration frequency and vibration modals of the car rear-view mirror under the condition of excitation sources. Based on this and the strength analysis results of the rear-view mirror, we make a optimal design of the rear-view mirror structure. We get five-order vibration modals in working condition and analysis the size of displacement and deformation, and dynamic characteristics. The results show that because of the low modal frequency, the car rear-view mirror is easily inspired by the engine, powertrain system and road to vibrate. Besides, the deformation and the strain distribution of the rear-view mirror are not uniform. So we should control the low rank flexibility modal frequency within a certain threshold frequency when designing its structure. On the condition of little changes of its overall volume, the maximum equivalent stress of the rear-view mirror decreased by 30.5% through optimizing design.
Material and Structure Design for Welding Joints in Railways Basing on Mechanical-Property Tests
Authors: Li Zhi Gang , Su Yong
Published: July 2012

Industrial design is important for industry, especially in the circumstance concerning the human security, of which the material selection and design basing on serious experiments, especially mechanical-tests have drawn more and more attentions of many artists and scientists. In this study, by tension, impact, hardness and scanning electron microscopy (SEM), the mechanical property of the flash butt welding joint of U71Mn rail steel to bainitic alloy steel used for railway frog is studied. The results indicate the distribution of hardness in the alloy steel side is uniform, and the hardness at the HAZ (hot affected zone) of the rail steel is higher than that of the base material. The tension property is the same as the U71Mn steel, and both the tension and impact property meet the corresponding requirements of Railways Ministry, which indicates the feasible of the bainitic alloy steel to the rail steel joint by flash butt welding.
A New Kind of Semi-Active Suspension Magnetorheological Fluid Shock Absorber Damping Force Model
Authors: Sun Peng , Wang Jian Feng , Feng Feng
Published: July 2012

Based on the damping characteristics, design a kind of magnetic fluid shock absorber, and the damping force theory formula, derived from the damping force of the formula can be that, according to the design of shock absorber, in the vehicle suspension on the dynamic performance simulation test for the damping-displacement characteristic and speed characteristics is verified by experiments, the proof is in the formula of the damping force of the damping force and the polarization current into nonlinear (secondary) relationship is reasonable, to design the actual shock absorber to really have a certain reference value.Intorduction
Finite Element Analysis on an Independent Variable Diameter Pile under Marine Environment
Authors: Yi Lu Ping , Ji Jing
Published: July 2012

Research on the mechanical properties of variable diameter Independent pile under the combined action of wind, wave and flow is carried out. Taking a variable diameter Independent pile in CB11F platform of Chengdao oilfield for example, simulative analysis is performed using the finite element software ANSYS , considering the influence for some factors to structure response, that is environmental load, soil conditions and variable diameter position. The variable diameter part of the smooth gradient cone is simplified reasonably, getting the top of the displacement and the whole body stress of variable diameter pile under wave and flow actions, comparing with the result of non-variable diameter pile, the results show that the displacement and stress of variable diameter pile decrease more than 20%, the measure adopted in this paper about decreasing the displacement of independent pile and the stress of whole body is validated.
Analysis and Design of Concrete Cylindrical Shell Roof Structure
Authors: Yi Lu Ping , Ji Jing
Published: July 2012

Combined with the roof of a warehouse the arched shell roof structure is select, simulation Numerical simulation is carried out for the arched shell roof structure system by the ANSYS finite element method, the deformation and stress are obtained which meet the specification requirements. So it is reasonable to select the thin vaulted roof. Finally, the arrangements of the two prestressing tendons of prestressed concrete beams in the framework and the matter which needs to be paid attention to during designing are given, and these can provide reference for similar finite element solution and design of the structural system.
Structure of Phosphate Amphoteric Cassava Starch and its Reinforcing Effect on Secondary Fiber
Authors: Yu De De , Zhang Hong Wei
Published: July 2012

In the present work, a series of the phosphate amphoteric cassava starch was synthesized by a two-step semi-dry process with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CTA) as the cationic reagent and phosphate mixture as the anionic reagent. The structure of the amphoteric starch was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The reinforcing effects of the amphoteric starch on the secondary fiber were also studied. The results indicated that the reaction occurred not only on the surface but also in the interior of starch granule, not only in the amorphous region, but also in the crystalline region. All the amphoteric starch showed reinforcing effect on the secondary fiber. The No. 5 sample showed better reinforcing effects on paper strength due to its higher total degree of substitution (0.095), proper DSA/DSC ratio (DSC=0.067, DSA=0.028) and interior modification of the starch granule. Compared with the control sample, the secondary fiber paper with 1.0 wt% (relative to dried pulp) of No.5 phosphate amphoteric starch showed 25.6%, 21.4% and 29.4% increases in tensile index, tearing index, and burst index, respectively.
Optimization of Cutting Parameters in Machining
Authors: Liu Yu Hui
Published: July 2012

The paper analyzes the reasonable selection of cutting parameters and states the relations among maximum profit-oriented cutting speed, minimum cost-oriented cutting speed and maximum productivity-oriented cutting speed. It establishes a mathematical model for the optimization of cutting parameters in machining.
Vehicle Brake-Pedal Arm Strength Analysis and Optimization Based on ABAQUS
Authors: Zheng Yu Qing , Xu Hai Yan , Li Bing
Published: July 2012

During the whole vehicle design and development phase, the brake pedal arm strength is vital to vehicle drive control. In this paper, the original FEA model was built in Hypermesh and the strength analysis was operated based on ABAQUS Standard module. Because the 1st stress result couldn’t match stress requirement, the brake pedal arm structure was optimized and recalculated again until it passed the design requirement. This analysis process may be applied in verifying the brake pedal arm strength of a new developing vehicle and guiding other parts’ strength before the real experiments in the lab.
Seismic Performance Analysis of a Hollow Tower Structure with Three Prismatic Section
Authors: Yi Lu Ping , Ji Jing
Published: July 2012

In order to better understand seismic performance of tower body structure in a square, the symbol tower finite element model is established using the finite element software ANSYS. Modal analysis is carried out and the first 3 natural frequencies and vibration modes of marking tower are obtained. By selecting 2 group natural seismic waves and a synthetic seismic wave the seismic time-history analysis of the model is performed, the symbol tower response under the earthquake action is obtained and the maximum lateral displacement and the maximum stress of symbol tower meet the standard requirements, so mark tower under earthquake are safe. These can provide reference for the same type of engineering design.
Study on the Intelligent Design System of Square Tube Aluminum Profile Extrusion Processes Based on VB
Authors: Zhang Zhi Ping , Liu Han Wu , Li Xiao Xia
Published: July 2012

According to the similar characteristics of structure, geometry and constraints conditions in the same type of extrusion process, the intelligent design system of a square tube aluminum profile extrusion forming process was established in this paper based on the VB programming language, with using parametric programming language APDL provides by ANSYS software. The parameterized optimization design plan of pre-treatment and post-processing of ANSYS analysis during a square tube aluminum extrusion forming process was achieved, and the program of a three-dimensional model of the extrusion die under Visual Lisp environment was also programmed. The human-computer interaction intelligent design system which combined with pre-processing of semi-finished product, finite element analysis of extrusion die strength, extrusion die temperature field analysis, structural optimization of the die was realized. The research results show that the system can provide program decision-making, structural design, performance analysis and graphics treatment for the actual extrusion productions of square tube aluminum extrusion process, which reduced the design time of the technical staff, and saved design cost.
Development of a Centripetal Knuckle Bearing Performance Analysis and Parametric Drawing System Based on AutoCAD and VBA
Authors: Yao Hui , Cao Yan
Published: July 2012

A centripetal knuckle bearing performance analysis and parametric drawing system developed on AutoCAD platform is introduced in the paper. VBA is utilized to develop the system that accords with the Machine Design Manual and meets common centripetal knuckle bearing type selection flow. Databases of various series of knuckle bearings are established with Access and AutoCAD is connected with Access using ADO to call the data in the Access databases from AutoCAD platform. The system interface established with VBA is easy to use and guide the designer to accomplish the type selection and life check of a knuckle bearing and call the parametric drawing module to complete its detail drawing. The system can not only facilitate the bearing selection and drawing process, but also enhance the integration degree of product design process.
6-DOF Loading System with the Simulated Border
Authors: Li Bing , Wei Yu Lan , Wang Yue Zhan , Yan Qi Bo
Published: July 2012

There is a set of 6 degrees of freedom (6-DOF) loading system with the simulated border for the application of material structural strength and reliability tests. This is a novel equipment for the tests of structural mechanical properties and reliability in different materials. This study showed a three-dimensional structure model, introduced the definition of the test of the 6-DOF loading system with the simulated border, and discussed the primary theory of the system and technical performance. Based on the matrix of direction cosine of the system, the solutions of inverse kinematics of 6-DOF loading system were given. The system of control was introduced as well.
Static Simulation on Wind-Induced Buckling of Large LNG Tank
Authors: Yi Lu Ping , Ji Jing
Published: July 2012

Several wind pressure distribution forms of domestic and foreign large LNG storage tanks are introduced in this paper, and the similarities and differences among them are gotten by comparative analysis. The wind pressure distribution of the analytic form used by foreigners and the discrete values given in building structure load specification are substantially the same, but the discrete values used in our specification are partial in safety. Then large LNG tank wind-induced static buckling analysis is developed, and these can laid the foundation for the further research on wind resistance of LNG storage tank.
Modal Analysis on Anchored Tank Considering Shell and Fluid Coupling
Authors: Yi Lu Ping , Ji Jing
Published: July 2012

Earthquake response of structure is determined by the vibration properties of earthquake and structure, it is very important for seismic design of storage tanks to accurately grasp the vibration characteristics of tank (frequency and mode shapes). In this paper, finite element model of exposure anchored 2000m3 tanks has been established by software ANSYS, calculating the first 3 order frequencies of liquid (0.247, 0.418, 0.517Hz) and frequencies of beam modes (6.087, 12.748, 21.77Hz), and comparing with the results of standard formula and the literature, both are in permissible error range. Vibration law of tanks has been analyzed, and it is proved that cosθ-type beam modes played a major role in seismic performance of tanks. These can be used as a reference for analysis and design of similar projects.
DEM Simulations on the Heat Conduction in a Particle Mixer
Authors: Xu Yu Peng , Cui Li Jie , Ren Xin Xin , Ge Wei , Lin Wei Gang
Published: July 2012

Understanding the heat transfer among particles with uneven temperature distribution is a key to powder processing. In this work, the discrete element method (DEM) is used to optimize the interior structure of a particle mixer with multiple baffles to achieve better heat transfer between two particulate materials. The simulation results show that optimal values exist for the number of baffles and their widths, slope angles and spacing to enhance heat transfer. The results are helpful to the design of a variety of process such as the ultra-fast pyrolysis in “coal topping”.
GPU-Based Simulation on Particle Mixing in a Tote Blender
Authors: Ren Xin Xin , Cui Li Jie , Ge Wei
Published: July 2012

The mixing of dry solid particles is extremely important for pharmaceutical and chemical industries. Computer simulation is a convenient way to study the microscopic mixing process. In this paper, a GPU-based DEM software is tested in large-scale simulation of a tote blender by comparing with experiment data from literature and then employed to study the effects of operation conditions on the mixing rate. The results are in good agreement with experiments, confirming that the GPU-based DEM software is an effective and reliable tool for the study of micro-dynamics in particles mixing.
Effect of Activated Attapulgite on Ammonia-Nitrogen Removal
Authors: Liu Fei , Hu Tao , Ren Shi Ying , Shi Ying Ying
Published: July 2012

The removal of ammonia-nitrogen (NH4+–N) in water by activated attapulgite was investigated. The study focuses on the effect of different activated attapulgite. The influence factors include microwave power, heating time and pH value in solution. The results show that heating 4 minutes, microwave power of 89 watts, and pH value of 9 are the best conditions to remove NH4+-N in the wastewater and the removal efficiency can above 80%. The attapulgite activated by microwave and alkali can remove NH4+-N in breeding waste effectively and the removal efficiency can reach 84.15%.
Application of the Exergy Method to Environmental Impact Assessment: The Heat Exchange Process as a Case Study
Authors: Zhu Ping
Published: July 2012

This paper focuses on evaluation of the heat exchange process based on cumulative exergy analysis method. The case study chosen is the countercurrent heat exchange process that is widely used in the industrial processes. The optimal design is achieved by minimizing the annual total cumulative exergy consumption of the cold stream. The natural resource-oriented mathematical models are established in details. Obviously, the results from cumulative exergy optimization are imposed by the present state of the technology compared with the ones from thermoeconomics
Based on Numerical Simulation to Investigate the Process of Gas Explosion Accident in Coal Mine
Authors: Zhang Xian Tang , Li Xiao Long , Wang Hong Li , Zhou Hong Min
Published: July 2012

The gas is one of the most important factors which endanger the security of the mining production. Most of serious accidents are the gas explosion accidents in coal mine. By investigating the damage situations of the gas explosion accidents and the related material, finding out why these incidents happen is an important way to prevent or reduce the gas explosion accidents. Based on the occurred gas explosion accidents, the author use the FLUENT software to simulate the process of gas explosion and get the variation law of various air current parameters is obtained in gas explosion. The explosion causes and development course are discussed. Compared with the explosion parameters collected on scene of accident, it provides comprehensive scientific basis for the accident investigation. The conclusion is helpful to adopt suitable measures to prevent the gas explosion.
Discussion on the Pollution Characteristics in Environmental Monitoring Laboratory and its Corresponding Control Countermeasures
Authors: Lv Xiao Ming , Li Xiao Ming , Liu Jing Yong
Published: July 2012

With the continuous improvement of our environmental monitoring system, environmental monitoring laboratory has actually become the typical small pollution sources, which caused very prominent environmental pollutions. However, the pollution problems in the environmental monitoring laboratory are basically in the neglected state and without the standardized management. The paper analyzed the common polluted emissions and characteristics about the process of environmental monitoring in the laboratory. How to reduce laboratory contamination from the sampling, chemical analysis and monitoring processes was discussed. The main pollution problems were caused by the lack of laboratory environmental awareness and the laboratory contamination control at the expense. In conclusion, strengthen the environmental monitoring laboratory management and environmental education, recycling the laboratory waste, separating collection, and treating by different methods are the main ways to solve the pollutions in the Lab. The monitoring departments at all levels must improve its environmental quality in order to reduce the environmental pollutions and make efforts to avoid the pollution of the monitoring laboratory waste.
Evaluation of Heavy Metal Contamination in Limestone Soil from Suzhou Area, Anhui Province, China
Authors: Chen Song
Published: July 2012

The heavy metal elements analysis had been carried out for the limestone soils collected from Suzhou area, the degree of heavy metals pollution were evaluated by such methods as enrichment factor and geoaccumulation index, and the correlation and principal analysis of the testing results were studied based on SPSS. The results showed that the heavy metals of the samples can be subdivided into tow type: the Pb、Zn and Cr are below the first quality standard level, the Cu and As are between the first and second level of quality standard, the heavy metal element pollution degree were as follows: Cu>As>Cr>Zn>Pb>V. The V and Zr are controlled by the contamination of the detrital; the Pb, Sr and As are controlled by the source rock (limestone); the third factor contain the Zn, Cu and Al, which showed the effect by agriculture.
Study on Irrigation and Drainage System Based on Water-Saving and Salinization Prevention
Authors: Shi Jin Rui
Published: July 2012

For the water-diversion irrigation area which relies mainly on canal irrigation but easily results in secondary salinization, it is an imperative issue to set up a rational irrigation and drainage system. This paper, based on the principle of both water-salt balance and water amount balance, studies the irrigation and drainage system and the method of water saving and salinization prevention, and proposes an easy and practical method. The system and method are applied and tested in a typical irrigation area. The study is of great value to the design of the gravity irrigation and drainage area and the transformation of the secondary salinization irrigation area.
Distributation and Implications of Heavy Metal in Jiangsu Coastal Sediments in China
Authors: Han Zhao Xiang , Zhu Zhen , Wu Dan Dan , Liu Yu Rong
Published: July 2012

Heavy metal concentrations in sediment samples from the Jiangsu coast were determined to explore the spatial distribution and the levels of contamination. The total Cu concentration in the wet season showed higher values than those of the dry season for all stations in Lianyungang coast. The highest CF values for Zn, Cr and Ni at S2, which receives a huge amount of metallic discharge from Zn and Cr mine in bulk in port of Lianyungang. Cu, Cr, Cd, Pb and Ni had the highest EF values at Yancheng coast and Cd had the highest EF values in Nantong region. The Pb and Ni concentration levels are mainly affected by natural sources in Nantong coast and the potential ecological risk indices of Cu and Cd in Yancheng coast, which indicated moderate potential ecological risk of two metals. And the risk associated with Cr in the sediment was moderate risk in most coasts, while the concentrations of Pb in most coasts were of higher risk. The heavy metal concentration of Cu, Zn, Cr and Pb at Lianyungang, Zn, Cr and Pb at Yancheng, Cu, Zn Cr, Pb and Ni at Nantong were below ERL, which represent a minimal-effects range, which is intended to estimate conditions where biological effects are rarely observed. For Cd concentrations at Lianyungang, Yancheng and Nantong are greater than ERL and more than ERM, which represents a range with in which represents the potential acute toxicity of contaminants and aprobable effect range within which adverse biological effects frequently occur. For Pb and Ni contaminant at Yancheng are greater than ERL and less than ERM, which represents a range with in which biological effects occur occasionally.
Effects of Pre-Carbonization on Structure and Electrochemical Performances of Amphiphilic Carbonaceous Material-Based Activated Carbons
Authors: Zhang Cui , Wang Cheng Yang , Chen Ming Ming , Zheng Jia Ming , Wang Jiu Zhou
Published: July 2012

Activated carbons to be used as electrode in electrochemical double-layer capacitors were fabricated using amphiphilic carbonaceous material (ACM) as precursor. To study the significance of functional groups and microcrystalline of the precursor in preparing AC, we applied pre-carbonization upon the ACM under different conditions to control these two parameters in this paper. FTIR and XPS spectra showed functional groups on the precursors decreased as the increase of pre-carbonization temperature. After carbonization at 800 °C, the growth of graphitic microcrystallites was noticeable. Porous structure parameters of final ACs inferred that the functional groups on the precursors have a more significant effect than microcrystalline size on formation of mesopores during activation process not only for its role as active sites but also the homogeneous activation profited from the solubility of samples in alkaline solutions. The sample AC0 with almost half mesopores showed the best electrochemical behavior with a specific gravimetric capacitance of 255 F/g at current density of 1000mA/g and kept rectangular shape cyclic voltammetry curve even at scan rate high as 400 mV/s.
Impact of Process Parameters on Oxygen-Bearing Low Concentration Coal Mine Methane Enrichment by Proportion Pressure Swing Adsorption
Authors: Li Yong Ling , Liu Ying Shu , Yang Xiong , Meng Yu , Zhang Chuan Zhao
Published: July 2012

Conventional PSA methods with a single adsorbent can result in an explosive CH4 concentration of 5 to 15%, making low concentration coal mine methane (LCCMM) or risky in terms of safety at a concentration of 30%. Proportion Pressure Swing Adsorption (PPSA) is a new and safer enrichment method suggested for LCCMM enrichment that uses a mixture of active carbon (AC) and carbon molecular sieves (CMS) as adsorbents. The effect of adsorption Pressure, adsorption time and bed length on the PPSA process were investigated to verify the feasibility of this method. The experiment results show that the methane concentration in desorption gas and the oxygen concentration in exhaust gas increased and decreased, respectively, with an increase in adsorption pressure or bed length. And the methane concentration in desorption gas is increased with the adsorption time expanding, but the recovery of methane is reduced. So the methane concentration in desorption gas can be increased to more than 30% and the oxygen concentration in exhaust gas be decrease to less than 12% by increasing the adsorption pressure or lengthening the bed.
Study on the Magnetic Separation Experiment of Vanadium and Titanium Iron Concentrate Pellets
Authors: Ma Lan , Yang Shao Li , Li Ya Ling
Published: July 2012

Based on Vanadium and Titanium iron concentrate pellets as raw material produced by direct reduction process of coal rotary hearth furnace in an enterprise, the paper studies the impact of magnetic separation process parameters on magnetic separation effect. The results shows that: the use of magnetic separation process can successfully separate metallized pellets, and obtain vanadium titanium micro-alloy iron powder and ti-enriched slag; suitable magnetic separation process parameters are: excitation current of 4A (magnetic field strength 2250Oe), particle size -200 mesh (-74μm), mine concentration of 1:3, iron recovery 92.5% TiO2 recovery up to 55.5%.
Blue Phosphorescent Organic Light-Emitting Diodes Based on SFX2PO Host
Authors: Qu Da Long , Wang Xue Hui , Liu Zi Yang , Liu Dong Yang , Zang Chun Liang
Published: July 2012

We report on blue phosphorescent organic light-emitting diodes (PHOLEDs) with biphenyl (Spiro[ﬂuorene-9,9′-xanthen]-2-yl) phosphine oxide（SFX2PO）host. The device studied in this work has the structure of ITO/m-MTDATA:MoOx(10nm)/m-MTDATA(30nm)/ TAPC(10nm)/SFX2PO: Firpic(10nm)/Bphen(40nm)/LiF(1nm)/Al(200nm), in which maximum luminance of 8950 cd/m2 and power efﬁciency of14.65 lm/w have been achieved.