bluuebunny/crossref_metadata_2025 huggingface dataset:
Electric and Hydrodynamic Fields Distribution in an Electrohydrodynamic Pump
Authors: Ostahie Constantin Narcis
Published: February 2014

A numerical simulation of electric and hydrodynamic field’s distribution in an electrohydrodynamic pump is made, with the mean to simulate and to determine numerically the liquid pressure and velocity. Different parameters of the pump are analyzed.
Ultrasonic Vibration Effect in Grinding of Ceramic (Al2O3)
Authors: Park Kyung Hee , Hong Yun Hyuck , Kim Kyeong Tae , Lee Seok Woo , Choi Hon Jong , Choi Young Jae
Published: February 2014

In this work, machining test was carried out in various machining conditions using ultrasonical vibration capable CNC machine. For work material, alumina ceramic (Al2O3) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonical vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic mode, ultrasonic vibration of 20kHz was generated by HSK 63 ultrasonic actuator. On the other hand, grinding forces were measured by KISTLER dynamometer. And an optimal sampling rate for grinding force measurement was obtained by a signal processing and frequency analysis. The surface roughness of the ceramic was also measured using stylus type surface roughness instrument and atomic force microscope (AFM). Besides, the scanning electron microscope (SEM) was used for observation of surface integrarity.
Method Preparation and Solution Algorithm for Resolving Stationary Problem of a Rod under Thermo - Stressed Condition Restrained at both Ends Affected by Heat Exchange and Heat Flows
Authors: Tashenova Zhuldyz , Nurlybaeva Elmira , Kudaykulov Anarbay
Published: February 2014

In this article the computational algorithm and solution technique of the problem of identifying temperature field as well as strain and stress components throughout the rod length exposed to heat flows supplied to cross section areas of both ends and heat exchange in its lateral surface on the basis of heat quantity variation law are developed. Herewith the tested rod physical and mechanical properties are taken into account. The solutions so acquired are presented in a graphical form. Certain dependencies between temperature pivotal values and capacities of the set heat flows are found.
Numerical Data in Weakly-Dissipative KAM-Theory
Authors: Bogdanov Rifkat Ibragimovich , Bogdanov Mihail Rifkatovich
Published: February 2014

In the article are presented as figures numerical data calculation of the basic thermodynamic variables such as dependence of the thermodynamic potentials from the temperature and pressure, and the geometric characteristics of the dynamics like the center of mass of trial particle. The dynamics is described by a simple Euler discretization of family of vector fields arising in the Bogdanov-Takens bifurcation.
Generalized Formulation to Estimate a Potential Complex Function of a Flow Past Multiple Cylinders
Authors: Armengol Jan Mateu , Sedano Carlos Salinas
Published: February 2014

This paper presents a generalized formulation to calculate an approximation of the complex potential function due to a flow past over any distribution of circular cylinders with different radius and circulation. To validate the formulation, the stream function over different configurations of cylinders is calculated. As an example, the potential complex function of three different configurations of cylinders in the z-plane is studied. In addition, in order to show the interference among the cylinders, the velocity and pressure distribution are also calculated.
CFD Study on Flow Characteristics of BOF Gas in Evaporating Cooler
Authors: Zhang Fu Ming , Cheng Shu Sen , Zhou Hong , Zhao Jing Jing
Published: February 2014

Basic oxygen furnace (BOF) gas dry dedusting technology is the main orientation of steelmaking industry. It has technical superiority in high efficiency energy conversion, energy saving and emission control and clean environmental protection fields, and it can decrease water consumption greatly, have high efficiency for steam and gas recovery, and reduce environmental pollution, and it is a key technology for realization of high-efficiency energy conversion in the contemporary steelmaking. The evaporating cooler is a key facility of temperature control for the BOF gas; it plays an important role in dedusting process. The CFD numerical simulation on flow characteristics of BOF gas in evaporating cooler has been accomplished. The gas velocity distribution, temperature distribution and dust distribution in the evaporating cooler are simulated by CFD. According to the result of research, a number of optimizations are applied in engineering, and have been proven by the outstanding performance in operating practice.
Kinetics Analysis of Decomposing Tributylphosphate with Non-Thermal Plasma
Authors: Wang Xin Liang , Meng Zhe , Gu Fan
Published: February 2014

Non-thermal plasma technique can be used to degrade radioactive liquid waste involving Tributylphosphate (TBP) producing in nuclear fuel reprocessing. The dissociation reaction caused by the collision of electrons with neutral molecules can generate active radicals which play a central role in removing TBP. And the electron reacting with vapor to generate OH radicals is the key reaction in removing TBP. A model is derived from the Boltzmann equation and molecule collision theory to predicate the dissociation reaction rate coefficients. Upon comparing with available literature, the model is confirmed to be acceptably accurate in general. Reaction rate coefficients of vapor dissociation in non-thermal plasma are derived according to the Arrhenius formula.
Seismic Response Analysis of the Numerical Simulation Method on Cable-Stayed Bridge Tower which Considers the Rigid Foundation
Authors: Luo Wei Bing , Fan Ji Ming , Lv Ji , Zhang Li Ya , Wu Cui Cui
Published: February 2014

The seismic responses under the action of far-fault and near-fault ground motions of the bridge tower structure of the long-span cable-stayed bridge are numerically discussed by means of the model of the bottom consolidation of the column. The results show that the responses of tower of the cable-stayed bridge correlate well with the properties of the ground motions. The seismic responses of the model have much larger values under the near-fault velocity pulse-like ground motions than those of the counterpart. The frequency of system reduces as the flexibility of structure decreases because of the rigid foundation; The displace response of tower shows that the rigid foundation has little influence on the seismic response of the cable-stayed bridge, while the acceleration response of the tower implies that rigid foundation has adverse effect. Thus, consideration of the soil-pile-superstructure interaction can be meaningful both in theory and reality during the seismic design of long-span cable-stayed bridge structure.
Erosion Behaviors of Impeller Material FV520B in Centrifugal Compressor
Authors: Wang Guang Cun , Li Jian Feng , Jia Xiu Jie , Zhu Zhao Ju , Guo Qi
Published: February 2014

To study the erosion behaviors and mechanism of impeller material FV520B in centrifugal compressor, the erosion experiments with polygonal alumina particles were carried out on the high-speed erosion testing system. Microstructure of the erosion zone was analyzed by SEM to reveal the erosion mechanism. An erosion model to calculate the erosion rate of FV520B was developed. The results showed that, FV520B exhibited the erosion characteristics of typical plastic materials, the highest erosion rate occurred at the impact angle of 24°, the lowest erosion rate occurred at normal impact angle. The velocity index at the impact angle 24° and 90° were 3.37 and 3.68, it grew as the impact angle increased. The erosion mechanism of FV520B was micro-cutting and deformation wear, at low impact angles, the erosion was dominated by micro-cutting wear, while at high impact angle greater than 60 °, the erosion was dominated by deformation wear. Also the predictions of the erosion model were in good agreement with the results of experiments, indicating that this model can be used to estimate the erosion rate of compressor impeller under different working conditions.
Thermodynamics of Cr(VI) Adsorption on Thiourea Chelating Ion Exchange Fiber
Authors: Jian Yan Qiang , Li Ming Yu , Zeng Qing Xuan
Published: February 2014

A chelating ion exchange fiber containing thioureido groups for the removal of Cr (VI) has been prepared from chloramethylated styrene grafted polypropylene fiber (2.96 mmol/g Cl) reacted with thiourea, batch adsorption experiments are adopted to investigate its adsorption equilibrium properties, Adsorption isotherms at various temperatures were obtained. Langmuir linear equation model can well describe the adsorption equilibrium data suggesting that the adsorption process involves both chemisorption and physisorption. The values of thermodynamic parameters, including ΔH, ΔG and ΔS, indicate that the adsorption of Cr (VI) is a spontaneous, entropy-driven and endothermic process.
Corrosion Test about Interference of Cathodic Protection Systems in Marine Concrete Structure
Authors: Jeong Jin A
Published: February 2014

When unprotected structures are nearby to CP systems, interference problems between unprotected and protected structures may be occurred. The stray current interference can accelerate the corrosion of nearby structures. During a recent few decades the protection technologies against stray current induced corrosion have been significantly improved and a number of techniques have been developed. However, there is very limited information in marine environments. In this study, cathodic protection systems installed both the ICCP with Ti-mesh anode and the SACP with zinc anode has been adopted to verify the current influence through laboratory experiment. CP potential and current have been investigated, moreover, 4 hour depolarization test has been involved to reveal the effectiveness of cathodic protection.
The Construction Technique of Steel-Wood Composite Core Formwork in a Large Span Prestressed Hollow Box Guider
Authors: Yu Jing Liang
Published: February 2014

Based on the comparison of several types of core formwork for large span hollow box girder, their structural characters, and assemble and disassemble in application is analysed to find that steel-wood core formwork is a better choice. Then the installation technique of steel-wood core formwork is discussed, including assemble, disassemble and anti-floating counter measures. The practice in some large span prestressed hollow box girder construction prove that steel-wood core formwork is a simple but effective core formwork construction technique with technological economic advantages because of its low cost, high working efficiency and better accuracy..
Study on Microstructure Changes of Soft Clay in the Peal River Delt under Dynamic Load
Authors: Liang Shi Hua , Zhang Lang , Liu Yong Jian , Fu Na
Published: February 2014

The characteristics and distribution of pores in soil are the key factors in the determination of the physical and mechanical characteristics of soft soil. Using static-dynamic true triaxial test system of modified SPAX-2000 and scanning electron microscope (SEM), the microstructure images of soft clay in the Peal River Delt are studied. By analyzing these microstructure images, eight microstructure parameters including number of pore, total area, classification of area, total perimeter, average diameter, roundness, shape coefficient and anisotropy have been obtained. The changes of microstructure parameters are analyzed ,before and after applying dynamic load . The results show that the change of microstructure parameters has certain rules. This study is help to provide microscopic theory basis for static-dynamic drainage consolidation method to treatment soft ground engineering design.
Speciation and Mobility of Heavy Metals in Tailings from Dachang Mine, China
Authors: Huang Quan Bi , Liu Hui Li , Zhu Yi Nian , Zheng He Hua
Published: February 2014

Two carbonate tailing samples were collected from Dachang mine tailing reservoirs, Guangxi Province, China. The chemical speciation of Zn, As, Cd and Sb contained in tailing samples were determined by Dold seven-stage sequential extraction procedure, as well as mineralogical and chemical analysis. Then the potential migration abilities of these heavy metals were evaluated. The tailing analysis results showed that the main minerals were calcite, quartz, sphalerite and pyrite, the major elements were Si, S, Ca, Fe and Al, and the trace heavy metals included Zn, As, Cd and Sb. Zn mainly existed in secondary sulfide, primary sulfides and residual fraction, and As was in primary sulfide and residue, but Sb and Cd was residual fraction. The mobility of heavy metals followed the order: Zn > Sb > Cd > As.
Preparate and Properties on Rare Earth PVA Complex Nanofibers
Authors: Zhang Di , Li Qing Shan , Zhao Li Jiao
Published: February 2014

Nanofiber is an important part in nanomaterials research field, and the polymer nanofibers is one of the important research directions. RE, which has unique electronic structure, the optical, electrical and magnetic aspects of the special nature, combine with the polymer, that has rich raw materials, simple synthesis method, easy processing, high impact resistance, light weight and low cost advantages, to get a new kind materials of practical uses and potential applications.
This topic was prepared PVA/Sm (NO3)3 composite nanofibers using an electrostatic spinning, and the PVA/Sm (NO3)3 nanofibers were treated at an appropriate temperature to obtain Sm2O3 nanofibers. Samples were characterized and analyzed by the SEM, FTIR, XRD, TG-DTA and other modern means. The results show that the surface of PVA/Sm (NO3)3 composite fibers is smooth, uniform size and amorphous. Sm (NO3)3 is not interact with the PVA groups, and the diameter of fiber is 200nm. After firing, the diameter of fibers was reduced to 100nm. PVA, Sm (NO3)3 and the water are completely decomposed at 600°C or more, finally obtained Sm2O3 nanofibers of single-phase crystalline state.
Mechanical Behavior of Hybrid Glass Fibre/Epoxy Clay Nanocomposites
Authors: Rafiq Ahmad , Al-Qadhi Muneer , Merah Nesar , Ali Yasir
Published: February 2014

Addition of organoclay to polymer matrix has recently attracted industry attention due to improved physical properties with an overwhelming potential in crude oil and water pipe applications. In this work, electrical grade-corrosion resistant (E-CR) glass fiber mats were used to prepare glass fiber reinforced epoxy (GFRE) nanoclay composites using hand layup method. Three different hybrid GFRE composites were made using 0, 1.5 and 3 wt% loading of I.30E nanoclay. High shear mixing was used to prepare the epoxy/clay nanocomposite. XRD results revealed a disordered intercalated morphology. The effect of nanoclay on mechanical properties were investigated by carrying out flexural and fracture toughness tests. The test results showed that addition of nanoclay up to 1.5 wt% improved both flexural strength and fracture toughness. However, these properties deteriorated when the clay content increased to 3 wt%.
Nanocomposite Multilayer Fibrous Membrane for Sustained Drug Release
Authors: Hassanin Ahmed , El-Moneim Ahmed Abd , Ghaniem Mohamed , Nageh Hassan
Published: February 2014

Building on the success of the many earlier studies on electrospun nanofibers technique which provide a non woven web to the order of nanometers introducing superior properties such as large surface area, superior mechanical properties and ease of implementation in many fields of applications, elctrospun nanofibers became an important issue for many researchers in various fields. Using elctrospun fibers as a drug carrier, is showing a huge promising potential for the future of biomedical application. Our work in this research is focusing on engineering a system to control the drug release profile rate especially for wound dressing. Nanocomposite multilayer fibrous membranes, using electrospinning method, have been developed for drug release in form of sandwich structure of three layers. Inner layer which is kept Polycaprolactane (PCL) loaded with drug. The two outer layers have been changed with different blend ratios between Chitosan (Cs) and PCL as follow [0%:100% Cs:PCL, 30%:70% Cs:PCL, 50%:50% Cs:PCL, 70%:30% Cs:PCL]. The results showed that the release rate has been affected dramatically by the outer layer composition. SEM images showed changing in the morphology due to the different in the composition of outer layer.
Modification of Titanium Dioxide Embedded in the Bio-Composite Film for Photocatalytic Oxidation of Chlorinated Volatile Organic Compound
Authors: Tharasawatpipat Chaisri , Kruenate Jittiporn , Suwannahong Kowit , Kreetachat Torpong
Published: February 2014

This research aimed to apply the Blown Film Extrusion technique to synthesize the titanium dioxide (TiO2) bio-composite films incorporated on a thin film as a photocatalyst. The biopolymer materials have great recognition via their renewable and biodegradable characteristic and the green composite has been a new challenge path to replace traditional polymer composite. In this work, TiO2/Polybutylene succinate (PBS) bio-composite film was developed to be used as a supporter for determining the photocatalytic oxidation activity of the TiO2 on the chlorinated volatile organic compounds degradation. PBS is a synthetic biopolymer which has a reasonable mechanical strength. The modified-TiO2/PBS bio-composite films were studied to evaluate the degradation of dichloromethane. In order to improve the distribution of the developed photocatalyst, the TiO2 powders were modified by 0.05% mole of ethyl triethoxysilane (ETES) and stearic acid (SA), respectively. The 10% wt. TiO2/PBS bio-composite films with thickness of 30 μm were prepared by blown film technique. To evaluate the dispersion efficacy, the modified-TiO2/PBS bio-composite films were characterized by Scanning Electron microscopy (SEM). Photocatalytic degradation of dichloromethane in gas phase was determined using an annular closed system photoreactor. The obtained result which was corresponding to the absorption of TiO2/PBS bio composites film was investigated in a range of 300-400 nm via UV/VIS spectrophotometry. The energy band gap of TiO2, ethyl triethoxysilane-TiO2 and stearic acid-TiO2 bio-composite film was found to be 3.18, 3.21, and 3.26 eV, respectively. The SEM shows that the modified-TiO2 with both ETES and SA exhibit uniform dispersion, while the only TiO2 shows an evidence of agglomeration in the PBS matrix. For photocatalyst efficiency, the photocatalytic activity of modified-TiO2/PBS bio-composite film increased comparing to the TiO2/PBS bio-composite film. Moreover, the photocatalytic degradation of dichloromethane by ETES-TiO2/PBS bio-composite film yielded degradation efficiency of 47.0%, whereas SA-TiO2/PBS bio-composite film yielded the removal efficiency of 41.0% for detention time at 350 min.
Investigation of the Nanodiagnostics Probe Modes for Semiconductor Resistivity Measurements by Atomic Force Microscopy
Authors: Ageev Oleg A. , Alyabieva Natalie I. , Konoplev Boris G. , Smirnov Vladimir A. , Tkachuk Vladislav V.
Published: February 2014

The work presents the results of theoretical and experimental investigations of the features and nanodiagnostics probe modes for semiconductors resistivity measurements by current technique of atomic force microscopy and by using test silicon samples with known resistivities (0.01 Ωcm, 1 Ωcm, 5 Ωcm, 10 Ωcm). It is shown that the measured resistivity data in air and in ultrahigh vacuum (10-8 Pa) is 166 Ωcm and 10 Ωcm, respectively, for the sample with ρ = 10 Ωcm of theoretically predicted resistivity. We showed that reducing of the measurements reliability in air, due to the local anodic oxidation of the substrate surface. Experimental studies of the influence of cantilever load forces (0.3 to 6.0 μN) to the samples surface on the current distribution are presented. Based on the experimental results we developed a mathematical model for determining the resistivity of semiconductor materials by current technique of atomic force microscopy. The results are useful to the development of probe methods for nanoelectronic devices analysis by atomic force microscopy.
Low Temperature Formation of Silicon Oxide Thin Film and Modification of Film Quality by Argon Excimer Light
Authors: Nishioka Kensuke , Sato Kosei , Ito Takuya , Ota Yasuyuki
Published: February 2014

Silicon oxide thin film was formed using reaction of spin-coated dimethyl-silicone-oil and 5% ozone gas at low temperature of 300°C. Silicone oil is used for lubrication, insulation, and so on, and it is inexpensive and easy to deal with owing to its stability. FT-IR spectrum of the formed silicon oxide film was similar to that of the thermally oxidized film, and we hardly observed peaks of Si-CH3 and C-H bonds originated in silicone oil. The Si-OH bonds in the film were observed. The Si-OH bond causes the degradation of the electric properties of the insulator. In order to remove the Si-OH bonds, the silicon oxide film was treated with an argon excimer light at room temperature. The wavelength of the light was 126 nm. The amount of Si-OH bond was drastically reduced by the UV annealing. The energy of the UV light is high and the value is 9.8 eV. The high energy light may cut the bond of Si-OH. Therefore, the amount of Si-OH bond could be reduced.
Effect of Thickness on Crystal Structure and Magnetic Property of Sr2FeMoO6 Film
Authors: Zhang Qin , Wang Hui , Sun Zhen Cui , Sun Hai Bo
Published: February 2014

Double perovskite Sr2FeMoO6 film with different thickness was prepared by electrophoresis method on single crystal Si substrate. The post-annealing treatment was carried out at 1100°C with 5% H2/Ar flow. XRD result shows that all the films are of single phase and belong to the I4/m lattice. All the films have no preferred orientation and exhibit typical polycrystal property. Measurement on scanning electron microscope shows that all the three films exhibit similar surface morphology. Different from crystal structure and surface morphology, Curie temperature (TC) shows a non-linear evolution with the thickness of the film. TC of the film increases firstly and then decreases, the highest TC is 300 K. This result indicates that ferromagnetism of the film is strengthened at the thickness about 35μm.
New Production Technology of Cement Particleboard
Authors: Shen De Jun , Jiang Wei Qiao
Published: February 2014

By using furniture production residues-shavings and magnesium oxychloride cement production environment-friendly cement particle board technology, and the production process of different wood than ash, water-cement ratio, press temperature, pressure and pressing time and other parameters conduct research and determine the best pressing temperature, pressing time, materials, scale and other parameters.
The Application of Green Material in Modern Architecture
Authors: Qiu Yu , Qiu Jing
Published: February 2014

The concept and the application of green material start from the modern times. In recent years, with deepening of environmental pollution, peoples health and the ecological balance got impacted; therefore, environmental protection gained peoples attention. Having realized the significance of architecture materials to environmental protection, people are more paying attention to the environmental protection effects in choosing and producing architecture materials. Then, the concept of green materials emerged and the green architecture materials began to be applied by architectures broadly. The application of green materials proved to be remarkable feature of modern architecture.
Wear Monitoring on Microcrystalline Aluminum Oxide Grinding Wheels on Profile Grinding with the Aid of Acoustic Emission
Authors: Benini Lucas , Weingaertner Walter Lindolfo , da Silva Maciel Lucas
Published: February 2014

The localized wear on grinding wheel edges is a common phenomenon on profile grinding since the abrasive grains are less attached to the bond. The grinding wheel wear depends heavily on the process parameters, workpiece and wheel composition, causing changes on the process and profile deviation behaviors. In order to cope with these uncertainties, many natural and synthetic materials have been used in different grinding processes. However, the influence of mixed compositions of different types of abrasive grains on external cylindrical grinding is not well known. In order to assess this relation, a methodology procedure was developed providing an overview of the cinematic edges behavior on a progressive wheel wear. The methodology procedure is based on the acoustic emission technology, using a transducer with a 50 μm radius diamond tip. The tip, when in contact with a rotating grinding wheel, enables the evaluation of the cinematic cutting edges. The abrasive grain density was evaluated for different grinding wheel compositions and specific wear removal values. Furthermore, these results were compared to the profile deviation observed on the same tool, allowing the assessment of the influence of different microcrystalline corundum grains on the overall grinding wheel wear behavior.
I-V Characterization Study of Porous Silicon Formation by Doubled-Cell Electrochemical Etching
Authors: Xiao Yong Yin , Chen Xiu Hua , Li Shao Yuan , Ma Wen Hui , Li Yu Ping , He Jia Li , Zhang Hui , Li Jiao
Published: February 2014

The anodic current-potential behaviors of PS fabrication by doubled-cell electrochemical etching method have been studied. There are three reaction regions: porous silicon formation region, a transition region and electropolishing region in I-V curves. Polishing current and the HF acid concentration has a directly proportional relationship, the electropolishing current of silicon increased with the increase of the concentration of HF, in a certain concentration range. The electropolishing current of silicon increased with increasing the sweep rate on the condition of the same HF concentration.
Research on the Numerical Simulation of Hot Stamping for High Strength Steel
Authors: Men Chang Feng , Du Wen Wen , Han Cui Hong
Published: February 2014

In order to research on the hot stamping property of high strength steel, the stamping forming of USIBOR1500P is simulated by the nonlinear finite element software Dynaform and Ansys/ls-dyna. The initial data simulated on USIBOR1500P is obtained by the hot tensile test. The simulation results show that the martensite weight percentage and Vickers hardness are in inverse proportion to stamping speed and initial die temperature.
Experimental Study on Conduction Heating of Ultra-High Strength Boron Steel
Authors: Liang Wei Kang , Zhou Ming Lin , Liu Hui Qiang , Zhang Yi Sheng
Published: February 2014

Conduction heating overcomes the shortage of the furnace, due to rapid heating and high energy efficiency. The heating experiment of ultra-high strength boron steel (LG1500HS) of a rectangular blank was implemented on the conduction heating system. The variations of the average temperature rising rate, uniform temperature region and energy efficiency were investigated under the non-heating-retaining condition. The results show that the average temperature rising rate, uniform temperature region and energy efficiency are 44.5°C/s, 225 mm and 71.6%, respectively.
The Uniform Elongation Experiment of Web and Flange of H-Beam
Authors: Ma Jin Hong , Tao Bin , Yao Xiao Han
Published: February 2014

Web and flange of H-beam are deformed indifferent zone in the rolling process, so non-uniform deformation is easily generated. In order to ensure the uniform elongation of flange and web, usually , the elongation ratio of flange is 3~5% more than that of web. Web wave or crack often appears. Flange wave, crack even tension fracture often appears. Experiment are designed that the elongation ratio of flange and web are changed to ensure the uniform elongation of flange and web. Thus, the rolling quality of H-beam is improved. The recommended rolling rule is provided, which can provide the accordance for actual production.
H-Beam Cross Sectional Microstructure Influence on its Mechanical Properties
Authors: Ma Jin Hong , Zheng Shen Bai , Tao Bin
Published: February 2014

It is difficult to control structural homogenity of H-beam, because of the special section, the metal flowing power is big and the section temperature is uneven. It is expanding strict to the shape of H-beam , dimensional precision and mechanical behaviour. In the process of the metal plastic deform, microstructure transmutation is great effect on the mechanical property. In order to analyse the effect of microstructure on the mechanical property , the tension test is operated and the microstructure effect on the mechanical property is analyzed .
Study on the Residual Stress in the Blooming Process of Large-Sized H-Beam
Authors: Ma Jin Hong , Zheng Shen Bai , Tao Bin
Published: February 2014

Based on the software of Deform-3D , the blooming process of H-beam has been simulated. The effect of different blooming temperature, different initial grain size and different rolling speed on residual stress was analyzed. According to the simulation from result , in the blooming process ,the residual stress of large sized H-Beam is mainly caused by uneven deformation. The big deformation exists in web. The flange deformation is only generated in the rolling surface. This uneven deformation leads to big residual stress in rolling piece. The residual stress of higher blooming temperature is much bigger than that of lower blooming temperature . Enlarging blank grain size has caused residual stress of web reduction, however, the whole residual stress will increase. Increasing the rolling speed of box-pass can significantly reduce the residual stress of R-joint and edges of flange.
Study on Mechanical Properties of the Corrugated Waist Rail with the Dynamic Finite Element Method
Authors: Ma Jin Hong , Zheng Shen Bai , Tao Bin
Published: February 2014

The corrugated waist rail has been successfully rolled in the Mill Research Institute of Yanshan University. It is necessary to conduct a comparative study on the mechanical properties of this special kind of rail with that of the ordinary rail. ANSYS/LS-DYNA, the finite element code, is used to simulate the contact behavior of wheel and rail. The study aims to investigate the influences of axle and lateral load on the stresses and displacement of the rail. It draws a conclusion that the mechanical properties of the corrugated waist rail is superior to that of the ordinary rail. It also provides a method and useful data for the further research on fatigue and wear of corrugated waist rail.
Cooling Effects of H-Beam after Rolling on Thermal Stress
Authors: Ma Jin Hong , Yao Xiao Han , Tao Bin , Li Shuo
Published: February 2014

Controlled cooling of H-beam after rolling, can change the microstructure consituent,improve the strength and improve the general mechanical property and service performance. According to actual product, the rational thermal boundary condition adopted, three dimensional FEM model is established. Spray cooling is used. Transient temperature field and stress field is simulated by the FEM software ANSYS/Multiphysics when H-beam is cooled. The four kinds of cooling scheme are designed. Through analysis of the relation of temperature field with stress field, the main reason of producing residual thermal stress is the section temperature difference in the cooling process of H-beam after rolling.
The Simulation of Rolling Process of Bar
Authors: Ma Jin Hong , Tao Bin , Yao Xiao Han
Published: February 2014

The three-dimensional models of rolling are established with Pro/E. Based on the finite element analysis software ANSYS/LS-DYNA, the procedure of bar tandem rolling is simulated. The nephograms of stress and strain of bar deformed area and the curve of roll force during rolling are obtained. Compared the result with the other result which comes from optimization, the precision of calculation will be verified.
DEM Analysis of Energy Loss in Elastoplastic Impact between Particles
Authors: Qiu Liu Chao
Published: February 2014

We applied the discrete element method (DEM) to analyze the normal impact properties of elastoplastic spherical particles. DEM simulation of impact between two identical elastoplastic spheres is carried out to validate the proposed model. The numerical results show well agreement with the FEM solution. Based on this model, the effects of impact parameters such as velocity, yield strength, elastic modulus, Poissons ratio, and mass density, on the loss factor in impact process, are then analyzed.
Research on Different Loading Methods of the Multi-Roller-Pressing Flexible Stretch Forming
Authors: Zhang Wei Chuan , Li Yong Feng , Li Ming Zhe
Published: February 2014

Based on the multi-roller-pressing flexible stretch forming (MRPFSF) process, force loading and displacement loading were researched. The process of spherical parts of 08AL sheet material were simulated by means of an explicit finite element method. The variations of the forming force in stretch-forming process and the distribution of stress after springback were analyzed comparatively for both loading methods. The results show that the change of the forming force in the force loading method has fluctuation. With the depressing of rollers, the vibration amplitude is smaller. At the end of forming, the forming forces of both loading methods are gradually consistent. The stress distribution of spherical parts formed by the two loading method is accordant.
Effect of Iron on the Sinterability and Properties of HA/Ti-Fe Composites
Authors: Chang Qing , Ru Hong Qiang , Chen Dao Lun , Yang Jin Long , Hu S.L.
Published: February 2014

Dense iron-containing hydroxyapatite (HA)/titanium composites were synthesized via pressureless sintering at a relatively low temperature using nanosized HA powders and Ti-Fe mixed powders. XRD analysis showed that desirable Ti phase still remained in the HA matrix. The addition of iron improved the densification by enhancing the sinterability of titanium, and reduced the decomposition rate of HA and the interaction between HA and titanium. The mechanical tests showed that both the flexural strength and fracture toughness of the composites were significantly improved. The Ti-Fe reinforcing particles exhibited plastic stretching and bridged an advancing crack, making a significant contribution to the improvement of mechanical properties of the composites.
Studies on the Way of Obtain Macroion C5H8O+ by the Ring of C7H12O+
Authors: Chen Hong Bin , Zhu Ying , Wu Jie
Published: February 2014

Using the CIS(Configuration Interaction with Single Substitute) method, we calculate the excited state structure and vibrational frequencies of cycloheptanone ion.
Type IV Dental Stone Incorporated with Antimicrobial Agents and its Physical Properties
Authors: Thaweboon Sroisiri , Thaweboon Boonyanit , Saksit Plang Ngern , Nisalak Passiri , Kaypetch Rattiporn
Published: February 2014

Contamination of dental casts can occur via direct contact with impression materials that are contaminated by patients fluids. Thus, the development of dental stone with antimicrobial activity to reduce cross-contamination between patients and laboratory personnel is needed. This study aims to evaluate the influence of incorporation of disinfectants into type IV dental stone on its antimicrobial activities and physical properties such as setting time and dry compressive strength. Type IV dental stone incorporated with 4 types of disinfectants; Diamond Rock D (3-iodo-2-propynylbutylcarbamate), Diamond Rock B (zeolite), Diamond Rock Z (thiabendazole) and Diamond Rock T (2-benzimidazole carbamic acid), were tested in this study compared with the control, Diamond Rock O (type IV dental stone without disinfectant). Microorganisms tested wereStaphylococcus aureusATCC 6538,Pseudomonas aeruginosaATCC 27853 andCandida albicansATCC 1023. One hundred μL of each microbial suspension (108CFU/mL) was dropped on hydrocolloid impression (Jeltrate; Caulk/Dentsply, Milford, DE) and left dry. All types of stone mixes were prepared and poured into the impressions and allowed to set for 60 min. Then the stone samples were removed and the microbial contact surfaces were imprinted on Brain Heart Infusion agar plates. After incubation, colonies appeared on agar were gram-stained and counted. The setting time and dry compressive strength were tested in accordance with International Standard (ISO) 6873: 1998 (E). Dental stone incorporated with 4 types of disinfectants showed antimicrobial activity against all tested microorganisms with the percentage of microbial reduction ranging from 83% to 100%. Among all types of dental stone, no significant difference in setting time was observed. In dry compressive strength testing, the disinfectant-containing dental stone had significant higher strength than that without the disinfectant. The newly developed type IV dental stone incorporated with disinfectants had antimicrobial effects against all tested microorganisms. The physical properties of the modified dental stones were within the ISO standards. However, further investigation on other properties such as dimensional stability, detail reproduction and clinical usage are still needed.
Evaluation of DNA Detection Kit for Authenticity of Unibract Fritillary Bulb Based on Pharmacopoeia Method
Authors: Zhou Ting Ting , Li Ming Cheng , Zhang Li Hua
Published: February 2014

Unibract Fritillary Bulb,as a fomous type of traditional Chinese medicine, derived from Sicuan in China. The objective of the study is to evaluate a kind of DNA assay kit to detect of Unibract Fritillary Bulb from their counterfiets in addition to optimizing its components and protocols. All genomic DNA from 20 samples of Unibract Fritillary Bulb were extracted by Pharmacopoeia method recorded in the expanded edition of China Pharmacopoeia (2010) and assay kit respectively, the PCR technique and Restriction Fragment Length Polymorphism Analysis (RFLP) were carried out to identify the authentication of Unibract Fritillary Bulb. The maximum value of genomic DNA extracted by Pharmacopoeia method is measured as 1.57± 0.05 (OD260/OD280) by Ultraviolet Spectrophotometer, whereas, the value is 1.73±0.10 by assay kit. The results of PCR and RFLP indicated that a single band over 300bp was shown and two distinct bands between 100bp and 250bp in agarose electrophoresis. The data demonstrated that the assay kit was better than the Pharmacopoeia method, especially in extraction quantity and DNA purity of the Unibract Fritillary Bulb nucleic acid; the PCR and RFLP results shown the two methods were consistent compeletiy. The DNA detection Kit for identification of Unibract Fritillary Bulb have good specificity, high sensitivity as well as strong stability, so it is suitable for the rapid detection of Unibract Fritillary Bulb.
Application of Energy Saving Technology in Roadbed Materials
Authors: Zhou Chuan Lin , Zheng Chao Cheng , Cheng Dong Xiang
Published: February 2014

Energy conservation is a longer period of a Chinas national policy, and the most important in economic sustainable development. With continuous rapid development in China's transport, problems as environmental pollution, high energy consumption, and low energy efficiency have arisen, which called for research, production and implementation of energy saving materials that would be the firm foundation of environmentally sustainable transport infrastructure in road traffic system. Currently, the application of advanced technology and brand new material used in pavement is beneficial for saving energy, reducing noise, and improving the economic viability of renewable energy. Various research projects have provided insights on how the use of energy efficient materials brings relatively exciting results as an essential prerequisite for sustainable development of the transport system. Therefore, the value of the broad application of sustainable, recycled materials utilized in road was clarified and illustrated by presenting some of the latest achievements in construction of sustainable infrastructure in road.
Fluidity and Mechanical Behavior of Cement Solidified Lead-Zinc Mine Tailings
Authors: Zhang Chun Lei , Wang Shun Cai , Min Fan Lu
Published: February 2014

Cemented paste backfill method has been widely used in many modern mines throughout the world due to the increasingly stringent environmental regulations and short of disposal land. This study presents experimental results on the use of Portland cement in the solidification of Pb-Zn tailings in China. Test results show UCS strength increase lineally with cement content, tailings concentration, and curing time, respectively. There exist a minimum cement content and tailings concentration to produce obvious strength. The fluidity decrease quickly with cement proportion and tailings concentration, under the satisfying of a minimum pumping fluidity, the increase of tailings concentration can effectively reduce the cement consumption so as to decrease the treatment cost.
Application Analysis of Finite Element Method in the Calculation of Foundation Pit Excavation
Authors: Xu Shan Shan , Li Wei Wei
Published: February 2014

This paper introduces the finite element method theory of foundation pit excavation, on the basis of summarizing the past experience, combined with the mechanical property of engineered soil, by using a variety of contact relation provided by the finite element software, select the appropriate unit to simulate the foundation pit excavation model scientific and reasonable. It has a very important guiding significance in practical engineering.
Investigation of Rare-Earth Salt Refiner on Purifying Effect of Impure Red Copper
Authors: Han Bao Jun
Published: February 2014

A method to fabricate a new kind rare earth salt refiner for purifying impure red copper was introduced in present paper, and the application of which on deoxidization, conductivity and mechanical properties of impure red copper were also inspected by composition analysis, Scanning Electron Microscope (SEM) and mechanical properties test technologies. The effect mechanism of the rare earth salt refiner on the performance of red copper was discussed in detail in this paper.
Experimental Analysis to Characterizing CO2 Emission of Roller
Authors: Jang Won Suk , Kim Joon Soo , Kong Byung Seung , Lee Duck Chan , Kim Byung Soo
Published: February 2014

CO2 emission from construction equipment directly affects the global warming by increasing greenhouse gas. While there are many indirect sources in construction processes that affect the global warming, such as construction materials, CO2 emission is considered as one of controllable and measurable sources of greenhouse gas if construction engineers make a careful plan of equipment schedule according to CO2 emissions and equipment productivity. This paper introduced a CO2 measurement method in a real-time during construction phase and analyzed the relationship among gas velocity, rpm and CO2 emission. While engine rotation and CO2 emission are closed related to each other, their relationship is not perfectly coincident because of the coupling effect between rpm and CO2 emission. In addition, complicated mechanism behind the CO2 emission exists even during the equipment operation because of the various conditions of equipment, rolling resistance, working type, and field environment. The findings from this research will help an environment-friendly planning of activity scheduling by considering CO2 emission together with the equipment productivity.
Review on Prepation and Application of Biochar
Authors: Zhang Zhi Xia , Wu Jing , Chen Wen Fu
Published: February 2014

Extensive application of biochar in agricultural and forestry production, environmental protection,energy and other areas has attracted widespread attention by researchers at home and abroad.By reviewing the progress on preparation and application of biochar in recent years , introduced pyrolysis,microwave carbonization,hydrothermal carbonization and analyzed the factors influence the ratio of gas,oil,and biochar,pointed out that the slow pyrolysis and medium speed pyrolysis can get more biochar ,fast pyrolysis can get more liquid product and flash pyrolysis can get more gas. Moreover, microwave carbonization can short the reaction time greatly and hydrothermal carbonization not only saved energy but also had a high production of biochar . Furthermore, described the use of biochar in agriculture , environmental protection and energy,thengave direction for the future research.
Adsorption Characteristics of Zinc Ions onto PVDF-PAA Membrane
Authors: Zhang Zun Ju , Hao Dong Liang
Published: February 2014

In this paper, a polyvinylidene fluoride-poly (acrylic acid) membrane (PVDF-PAA membrane) with the function of filtering and adsorption was prepared by using polyvinylidene fluoride (PVDF) and acrylic acid (AA). It was characterized by Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) and studied to remove Zn (II) metal ions from aqueous solutions. The different variables effecting the sorption capacity such as pH of the solution, adsorption time, initial concentration of metal ion and temperature have been investigated. Meanwhile, the sorption data was analyzed using adsorption isotherms of the Langmuir, Freundlich and D-R isotherms models and the sorption kinetics was evaluated using first-order, second-order and intraparticle diffusion kinetic reaction models.
Amorphous Zirconium Dioxide as a Potential Sorbent for Selective Removal of Phosphates in Aqueous
Authors: Jiang Chuang , Xiao De An
Published: February 2014

In the present study, we fabricated the amorphous zirconium oxides by the classic sol-gel precipitation methods. SEM analysis proved that the prepared ZrO2 particles are micrometer scales and XRD further illustrated its amorphous nature. The effects of solution pH on adsorption suggests the phosphate retention onto ZrO2 was a pH-dependent process and the optimum pH values between 4.5-8.0; competition tests also demonstrated its excellent selectivity by comparing D201 resin in presence of common anions at high levels. All the results proved that ZrO2 is a promising adsorbent for P(V) sequestration.
On Multiple Model Adaptive Control Strategy Research of Ball and Plate System
Authors: Zhao Bao Yong , Li Xiao Li
Published: February 2014

The ball and plate system is a multi-variable and strongly nonlinear-controlled object of which is a system of two-dimensional extension with the variables amid having strong coupling function, and simultaneously it demands the closed loop control system owning good transient process and transient response. From perspective of international and domestic scale, ball and plate system has not figured out effective-control scheme. Take into account the ball and plate system possesses trait of nonlinearity and high requirements for transient response, etc. This paper proposes multiple model adaptive control strategy which is very suitable for such system, as well as the direction and guidance of such research.
Neural Network Sliding Mode Control of 5DOFs Robotic Manipulator
Authors: Xu Chang Kai , Li Ming , Yin Jian
Published: February 2014

In this paper, a neural network sliding mode controller for a kind of 5DOFs robotic manipulator is proposed. A radial basis function (RBF) neural network is used as an estimator to approximate uncertainties of the system. The learning algorithm of the neural network improves the performance of the system. A globle terminal sliding mode control (GTSMC) is designed to guarantee the stability and improve the dynamic performance of the robotic manipulator. Simulation results show that the proposed NNSMC strategy is effective to ensure the robustness and dynamic performance of the 5DOFs robotic manipulator.