bluuebunny/crossref_metadata_2025 huggingface dataset:
Thermal Structure Coupling Analysis of Universal Mill’s Horizontal Roller Ring Based on ANSYS
Authors: Shen Shi Jie , Guo Xi Ping , Zhou Shuang
Published: June 2014

Based on the situation that universal mill’s roll rings appeared broken roller accident in actual production, the paper put the horizontal roll ring of universal mill as the research subjects. The thermal structure coupling field of horizontal roll ring reaches a dynamic equilibrium and the stress distribution of horizontal roller ring and finds the most dangerous parts of the roller ring is rolling groove. This study provides a solid foundation for further research of the roller ring strength, deformation and fatigue life.
The Research of the Effect of Velocity on Coupled Temperature Filed in Pin-on-Ring Friction Pair under Electromagnetic Field
Authors: Wen Qiao , Dong Lin , Yang Jie , Liu Zhei Wei
Published: June 2014

Based on the pin-on-ring friction pair jig, the temperature field model was established by FE software ANSYS under the coupled effect of electromagnetic induction heat and friction heat. The coupled temperature field distribution and variation rule of the analysis model were simulated and analyzed under different electromagnetic induction frequency and velocity. The results show that when the rotation angle, stress and electromagnetic induction frequency are constant, the maximum coupled temperature increases linearly with the increment of velocity, and the area of pin temperature gradients narrowed with the increasing velocity; the maximum coupled temperature rises with the increasing electromagnetic induction frequency under the constant rotation angle, stress and velocity. The research will provide FE simulation basis for the controlling of friction and wear by electromagnetic field.
Investigation on the Sintering Properties of Mullite Al2O3-70%
Authors: Gao Chang He , Sun Jia Lin , Li Yong , Zhang Jun Jie , Zhang Ji Li , Liu Shu Long
Published: June 2014

This paper takes Al2O3-70% natural mullite raw bauxite ore (Referred to 70-ore) and Al2O3-70% bauxite based homogenized grogs green adobe (Referred to 70-grog), produced by Beijing Tongda Refractory Technologies Co.,Ltd.through wet homogenization and vacuum pug process, as raw materials. 70-ore and 70-grog are fired respectively at 1100°C, 1300°C, 1400°C, 1600°C for 4 hours. Research on the influence of sintering temperature on the phase compositin, microstructure and bulk density. Analysis on the phase reaction during the sintering process. The results show that: Phase distribution of 70-ore is uneven. α-Al2O3 decomposed by diaspore is difficult to contact with amorphous SiO2 decomposed by kaolinite, this makes α-Al2O3 particle be unable to dissolve into amorphous SiO2, and causes twice crystallizing of mullite reaction hardly to happen. After a series of homogenizing treament, diasepore and kaolinite phase of 70-grog distribute more uniformly, which don’t destory the ore structure, and accelerate the twice crystallizing of mullite reaction. Compared with 70-ore, the twice crystallizing of mullite reaction extent of 70-gorg is more thoroughly. Rising the sintering temperature is beneficial for the twice crystallizing of mullite reaction, the growth of mullite and the bulk density of mateials. The adobes produced through wet homogenization and vacuum pug process have a big volume shrinkage, so controlling the removal of crystal water,the formation and growth of mullite are the keys to get dense bauxite based homogenized grogs.
Preparation and Wear Performance of Novel Graphite/Copper Alloy-Matrix Self-Lubricating Composite Materials
Authors: Chen Sui Yuan , Li Xin Rong , An Di , Liang Jing , Liu Chang Sheng
Published: June 2014

A novel graphite/copper alloy-based self-lubricating composite materials were prepared using the powder metallurgy method by composing 663 bronze, Ni, W, nanoAl2O3, MoS2, Ag, CaF2, Sm2O3 as the basic alloy powder and adding 1wt.%, 1.5wt.%, 2wt.%, 2.5wt.%, 3wt.% graphite and nickel coated graphite powder respectively to the composite powder. The microstructure, mechanical properties and friction properties of the samples were studied. The results show that the samples with nickel coated graphite powder have their wettability and the composite structure between graphite and copper alloy matrix is improved. When the content of graphite is 3wt.%, the properties of samples prepared by Ni-coated graphite are improved compared with those prepared by uncoated graphite. The hardness is increased from 34HV to 38HV, the crushing strength is from 116MPa to 151MPa, the friction coefficient is reduced from 0.28 to 0.21, wear loss is reduced from 20mg to 12mg. The samples prepared by Ni-coated graphite have good self-lubricating performance.
Preparation of Poly(m-toluidine)/Montmorillonite Composites and its Thermal Stability
Authors: Wang Hong , Yang Rui Song , Wang Ying
Published: June 2014

Poly (m-toluidine)(PMT) / montmorillonite (MMT) Composites with thermal stability were synthesized by in situ chemical polymerization of m-toluidine monomer in the presence of montmorillonite. The PMT /MMT composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The FT-IR result displayed the successful incorporation of montmorillonite clay in the prepared PMT/MMT composite. X-ray diffraction result for PMT/MMT showed the intercalation of PMT between the clay layers. The higher thermal stability of high MMT content rate might be attributed to its higher chain compactness due to the interfacial interaction between the PMT and the .MMT.
Effect of Diffusion Annealing on Defects Reduction of 6.5wt% High Silicon Steel Composite Plate after Hot Deformation
Authors: Ji Shuai , Han Jing Tao , Liu Jing , Yang Xing Wen
Published: June 2014

6.5wt% high silicon electrical sheet is hard to be obtained through conventional different rolling processes due to its remarkable brittleness at room temperature and appearance of ordered phases in the alloy substrates, especially it has very excellent soft magnetic properties. In this study, 6.5wt%Si three-layer composite panels were prepared by advanced technology of laminar composite. The defects, bonding strength, and distribution of elements of the coating and core layers are analyzed by the photographs of metallographic phase and SEM. Experimental results show that the high silicon composite plate could carry out lager plastic deformation on the traditional hot mill after the inner layer which is10%Si ferrosilicon alloy was coated. The defects generated during hot deformation were reduced and uniform distribution of elements were achieved through proper diffusion annealing process. This article provides a short process method to produce 0.3-0.5mm 6.5wt%Si thin sheet.
Discussion on Technologies of Preparation of Foam Aluminum Metallic Material by Infiltration Casting Method
Authors: He Wei Feng , Zhong Shou Yan , Chen Yong Zhi
Published: June 2014

Foam aluminum is a novel porous functional material. There are many methods for preparation of foam aluminum, wherein an infiltration casting method in the liquid phase method can be selected for the preparation. In the forming of a pore structure of the foam aluminum, infiltration depth and pore uniformity are mainly influenced by technological parameters including particle size and preheating temperature of particles and a mold, molten aluminum casting temperature and vacuum degree.
Production of 6.5wt%Si Composite Thin Sheet by Cold Rolling Process
Authors: Ji Shuai , Han Jing Tao , Liu Jing , Yang Xing Wen
Published: June 2014

Although 6.5wt% high silicon electrical steel has pretty excellent soft magnetic properties, it is hard to be obtained by cold rolling at room temperature, by virtue of appearance of ordered phases in this alloy. In this research we report that very thin 6.5wt%Si composite sheet with 0.05-0.08mm thickness was fabricated by proper heat treatment and cold rolling after hot deformation. The 6.5wt%Si composite plate exhibits some extent of ductility at room temperature when the stage of hot deformation was finished. The effect of heat treatment on mechanical properties of this composite plate was investigated by optical microscope. After heat treatment, ductility of this composite plate is increased due to the ordered DO3phase transformation inhibited by cooling fast. It is provided a referable method to produce 6.5wt% high silicon steel with conventional forming process.
Study on Superabsorbent Material in Thermal Infrared Camouflage
Authors: Zhang Nai Yan , Yu Jiang , Zhang Juan
Published: June 2014

Objectives, which is motional on the batter field, such as vehicles, tanks, planes, warships, firing cannons, etc. They are all active objects. On the surface of these objects there have very higher temperatures than around background, they have special pictures, and are easy found by thermal infrared reconnaissance systems. In this study, itaconic acid (IA) was co-polymerized with N, N-diethylacrylamide (DEA) monomer to improve the swelling behavior and the total absorbing water. These copolymer materials were prepared by changing the initial DEA/IA molar ratio and total monomer concentration. The chemical structure of materials was characterized by fourier transform infrared (FTIR) spectroscopy. In comparison with the PDEA hydrogel, the equilibrium swelling ratio (ESR) of the materials increase with the increase of IA content in the feed and the swelling dynamics behaviors of the different composition ratios of the P(DEA-co-IA) materials on the different temperatures was investigated in detail. Using the big hot-inertia of water, the superabsorbent material of the object surface is propitious to debase the object temperature, which suggests that these materials have potential application as thermal infrared camouflage materials.
A Hydrogen Peroxide Electrochemical Sensor Based on Co-Doped Fe3O4 Nanoparticles
Authors: Cui Xia , Sun Yi Qi , Ma Rong , Song Xu Chun
Published: June 2014

In the present paper, the Co-doped Fe3O4 nanoparticles have been successfully synthesized by the co-precipitation process. The morphologies size of the Co-doped Fe3O4 nanoparticles were characterized using scanning electron microscopy (SEM). The structure of the products were characterized by Xray diffraction (XRD). The composition of the product was analyzed by energy dispersive X-ray detector (EDS). The results show that the phase structure of the Co-doped Fe3O4 nanoparticles is spinel Fe3O4 with the particle size ranging from 40 to 50 nm. The prepared Co-doped Fe3O4 nanoparticles electrode was then applied to detect hydrogen peroxide (H2O2) in 0.01 M pH 7.0 phosphate buffer medium.
The Raman Properties of Ag Doped ZnO Microrods Synthesized by Chemical Vapour Deposition
Authors: Wang Li Na , Zhou Dan , Huo Sa , Luan Zhong Qi
Published: June 2014

Ag doped ZnO microrods are prepared on c-plane sapphire substrates by chemical vapour deposition method at high temperature.The morphology, structure and optical properties were investigated by scanning electron microscopy, X-ray diffraction and Raman spectrum, respectively. The prepared Ag doped ZnO microrods have good preferred orientation with very limited structural defects. The Raman bands indicates that a tensile stress existed in the sample and an additional local vibrational mode related to Ag is also found which can be used to confirm the existence of Ag in the Ag doped ZnO microrods.
Properties of Metallic Materials after Surface Self Nano-Crystallization
Authors: Pei Guang Yu , Li Dong , Li Kai Bin
Published: June 2014

Surface Self-nanocrystallization (SSNC) can produce nanometer grains (10~50μm depth) in the surface layer of metallic materials. And high strength, residual compressive stress as well as a mass of defects attributed to grain refinement and severe plastic deformation, greatly improve their surface properties, such as strength, wear resistance, diffusion property, fatigue performance and corrosion resistance. Now some methods have been confirmed which could realize surface nanocrystallization. This paper reviews the study of surface nanocrystallization and simply summarizes changes in their performance based on surface layer microstructure of metallic materials.
Simulation of Electric Field for Carbon Nanotube Assembly by Dielectrophoresis
Authors: Chen Yan , An Li Bao
Published: June 2014

In the process of carbon nanotube assembly by dielectrophoresis, the geometry and spacing of electrodes are significantly affecting the assembly precision. In the simulation process, we showed the geometrical shape of conical, round and rectangular electrode and compared the electric field distribution with these electrodes. Compared with single electrode pairs, comb electrodes can achieve high-yield manipulation. Simulation results show that when the distance between adjacent electrode pairs is larger than twice electrode width, it will avoid electric field superimposition. A method of using floating metal posts within the electrode gap can realize precise positioning of assembled carbon nanotubes.
Preparation and Mechanics Properties of the EP/TiO2 Nanocomposites
Authors: Bu Shao Fen , Jiang Yong , Zeng Wen Fu
Published: June 2014

The EP/TiO2 nanocomposites were prepared by using epoxy resin as matrix, nanoTiO2 as the modifier, polyamide as curing agent. The surface morphology of nanoTiO2 was observed,the average particle diameter of nanoTiO2 is 20nm. Their mechanics properties were studied and the experiment results were analyzed. The results indicated that the compressive stress-strain curves of the nanocomposites had obvious three phases characters, i.e., linear elastic phase, plastic yield flat phase and compact phase. Along with the nanograins content of the nanocomposites increasing, the compressive elastic modulus and compressive strength of the nanocomposites augmented. When the nanograins content is 5% and the transfiguration speed is 10mm/min, the compressive elastic modulus and compressive strength of the nanocomposites respectively improved 49.2% and 45.2% comparing with their of the pure epoxy resin. At the same nanograins content, with the transfiguration speed increasing, their compressive strength added.
Enhanced Mechanical Performance of Electrospun Graphene/Polyacrylonitrile (PAN) Composite Microfibrous Yarns via Post-Processing
Authors: Li Yun Yu , Guo Ling Jun , Wang Bin , Song Qiang
Published: June 2014

The graphene/Polyacrylonitrile (PAN) composites have drawn increased attention due to their significant improvements in mechanical and physical properties. A post treatment, enhancing the mechanical properties of the electrospun graphene/PAN fibrous yarns, was investigated in this study. The yarns obtained by this post treatment showed increased average strength and decreased elongation, which demonstrated that the as-reported method was an effective way to prepare higher performance electrospun graphene/PAN yarns. The method has potential application in preparation of micro ropes and self-assembled 3D electrospun fibrous yarns. Moreover, it is an innovation to apply dyeing during the investigation of the electrospun fibers under tension condition to analyze the tensile mechanism of yarns. The annular cracks were observed, which was recognized as the immediate cause for the yarns lengthening. Furthermore, according to its growth and fracture, the tensile mechanism of electrospun fibrous yarns was revealed.
Effects of Cr2O3 Addition on Mechanical and Electrical Properties of Alumina Ceramic
Authors: Zhang Hao , Xu Yan , Jin Hai Yun , Qiao Guan Jun
Published: June 2014

The effects of Cr2O3 additions on the mechanical and electrical properties of alumina ceramics were investigated. The phase composition, organizational structure of ceramics were analyzed and observed using XRD and SEM. The results show that doping with small amount (<7wt.%) of Cr2O3 can improve the mechanical (15% for bending strength, 83% for Vickers hardness) and electrical properties (minimum resistivity 9.8 × 1012Ω·cm), but when doping amount above 7wt.% , these properties were decreased.
Effect of H3BO3 Additive and Forming Pressure on Microwave Dielectric Properties of 0.95MgTiO3-0.05CaTiO3
Authors: Huang Jin Bao , Cai Yi Xiang , Xiong Zhao Xian , Xue Hao
Published: June 2014

0.95MgTiO3-0.05CaTiO3 (95MCT) microwave dielectric ceramics was prepared solid-state reaction method. Effect of H3BO3 additive and forming pressure on sintering process, microstructure and microwave dielectric properties of 95MCT were investigated. The result showed that the additive of H3BO3 can lower the sintering temperature of 95MCT, and improve the densification of 95MCT. MgTi2O5 was found as mesosphere, which can be effectively suppressed through the additive of H3BO3. Excellent microwave dielectric properties of ceramics was obtained when the H3BO3 additive was 0.50wt%. The best value of dielectric constant (εr), quality factor (Q×f) and temperature coefficient of resonant frequency (τf ) of 21.54, 67,286GHz and-4.1ppm/oC was obtained for the ceramics with sintering 1220oC for 2h.
Low-Temperature-Tunnel of High-Alumina Ceramics with Good Wear Resistance
Authors: Liu Jun Chang , Wu Bo Lin
Published: June 2014

As for the liquid-phase sintered (LPS) Al2O3 based on the CaO-MgO-Al2O3-SiO2 (CMAS) system, we found a strange phenomenon. It is commonly acknowledged that, the sintering temperature should be high corresponding with the increase of the content of Al2O3 in a special system. However, when the content of Al2O3 is limited within 95-98wt%, the conclusion is opposite. It means that there is a low-temperature sintering-tunnel. What’s more, as wear resistant materials, the wear rate of alumina ceramics reduces with the increasing of the content of Al2O3 among 95-98wt%. In this paper, taking industrial alumina as raw material, we obtain low-wear-rate high-alumina ceramics by conventional sintering in CMAS system. We explain and analyze the condition from the perspective of crystalline phase and microstructure by XRD and FESEM. The results show that the 98 porcelain is of better wear resistance and indicate excellent prospect in the fabrication of lower wear rate of high-alumina ceramics.
Structure and Dynamical Relaxation in Undercooled Liquid of Cu50Co50 with Miscible Gap
Authors: Qi Yu , Wang Li , He Tong Qiu
Published: June 2014

Molecular dynamics simulation has been performed to explore the structural and dynamical properties of undercooled Cu50Co50 melt based upon the embedded atom method (EAM), namely due to Zhou. With the reduction of temperature, liquid phase separation phenomenon is more obvious. The simulated coordination number (CN) of liquid Cu50Co50 indicate that no stronger interaction of heterogenic atom pairs than those of the same atom pairs happens in melts, and Cu50Co50 melt is close to an weak demixing system. And the Bhatia-Thornton (B-T) structure factor gets the same result. Temperature dependence of mean squared displacement (MSD) shows very weak glass formation behavior of Cu50Co50. Our work discusses that the relationship between the properties and L-L phase separation in undercooled liquid of Cu50Co50.
The Ways to the Main Problems in the Application of Low Temperature Co-Fired Ceramics Technology (LTCC)
Authors: Liu Xiao Dong , Wang Shao Hong , Hou Zhao Xia , Zhou Dan , Yang Li Qiong , Hu Wei Wei
Published: June 2014

As a new promising integrating and packing technology, the low temperature co-fired ceramic (LTCC) technology shows great potential in the microelectronics field and attracts great attentions for the scholars at home and abroad. In this paper, the practical application of LTCC is introduced and the emphasis is focused on the ways to the main problems in the application. As to this point, some advices are also given for the future development.
Influence of Nd-Doping on Electronic Structure and Optical Properties of ZnO
Authors: Chen Lan Li , Hu Hong Duo , Xiong Zhi Hua
Published: June 2014

A detailed first-principles study of electronic structure and optical properties of Nd-doping ZnO with various concentrations of Nd was performed using density functional theory. The results show that the band gap of Nd-doping ZnO slightly widens with the increasing Nd concentration, this is because the conduction band undergoes a greater shift toward the lower-energy region than the valence band, which is agreement with experimental results. Furthermore, in comparison to pure-ZnO, the Fermi level shifts into the conduction band after Nd-doping ZnO. And the calculated result of imaginary part of dielectric function of Nd-doping ZnO shows that there is a sharp peak in the lower-energy region, which is due to the electrons transition between d-d orbital of Nd atom.
Optical Properties of 5,5'-(9,9-dioctyl-9H-fluorene-2,7-diyl)Bis(thiophene-2-carbal dehyde): A Novel Organic Light Emitting Material
Authors: Tang Ze Biao , Sun Xiao Xia , Yan He Wei , Miao Le Ping
Published: June 2014

A novel D-A type molecule based on central fluorene unit and aldehyde group termini has been designed and constructed. Optical spectra show that, from the solution to the solid state, the absorption and fluorescence spectra of the compounds are red-shifted. Moreover, a red-shift of the absorbance maxima and the emission maxima of the compounds were observed due to the electron-accepting groups. Blue light-emitting properties with purity color range at 412–468 nm were also obtained. Thus, the target compound is expected to be a promising pure blue light-emitting material for applications in organic light-emitting diodes (OLEDs).
Mechanism Analysis on Concrete Column’s Recovery Strengthening
Authors: Lai Zhi Peng , Guo Shao Hua
Published: June 2014

This paper deals with the behavior of concrete columns actuated by SMA wires winding around the column’s cylindrical surface, when the concrete column are constrained and driven in circumferential direction by the SMA wires, the column’s ultimate bearing capacity and axial deformation are mainly studied. Both theoretical research and finite element simulation are carried out. The results indicate that, the SMA’s limited recovery in reverse transformation by heating can generate circumferential prestress, which will improve the concrete column’s ultimate bearing capacity and control its deformation, so as to realize the concrete column’s recovery strengthening.
Strain Rate Sensitivity and Adiabatic Shear Deformation of an Advanced Al-Mg Alloy
Authors: Lang Yu Jing , Zhou Gu Xin , Liu Wen , Hao Jie , Qiao Li , Wang Sheng , Jiang Jian Zhong
Published: June 2014

In order to develop new Al alloy, the quasi-static and dynamic compression deformation behavior of an advanced Al-Mg alloy, which contained Zn and rare earth, were investigated. Deformed microstructures in the shear bands of this alloy were characterized by optical microscope. Results show that the compressive strengths increase with strain and strain rates being increased, and microstructures of deformed Al-Mg alloy along compression directions are sensitive to strain rates. The distorted deformation twins near the deformed band can be formed under low strain rate of 5.6×10-3 s-1, while multiple shear bands slipping can be induced by dynamic deformation under high strain rates from 1.9×103 s-1 to 5×103 s-1. Therefore, compressive strength and fracture strain of dynamic deformation are higher than that of the quasi-static deformation, which is attributed to the strain hardening and grain refining in the multiple shear bands.
Experimental Study on the Mechanical Properties of the Crumb Rubber Concrete Modified by Latex
Authors: Li Wei , Huang Zhen , Wang Xiao Chu , Zhang Jian Peng
Published: June 2014

Through modification of the rubber surface, the adhesive ability of rubber particles and cement based materials has increased, thus improving the mechanical properties of rubber concrete. Dosage of styrene butadiene latex was studied under the condition of 5% cement quality, the change regularity of different amount of rubber latex rubber modified concrete compressive, splitting, flexural strength and other mechanical properties. The test results prove that the latex rubber mixing can improve compressive, splitting and flexural strength of concrete.
Comparison of Mechanical Properties of 357-T6 Aluminum Alloy Aast under Gravity Permanent Casting and Low Pressure Die Casting
Authors: Chen Ping , Zeng Jian Min , Gan Wu Kui , Liu Jin Bo
Published: June 2014

357-T6 is an alloy that has been widely used due to excellent casting properties and mechanical performances. The aluminum wheels can be cast with both permanent and low pressure die castings. In this study, the mechanical properties of 357-T6 were compared between the gravity permanent casting (GPC) and low pressure die casting (LPDC). The specimens were cast through permanent and LPDC processes, respectively and were heat treated under T6, with different aging temperatures 155°C, 165°C, 175°C and 185°C after the solution treatment of 545°C for 9 hours. The ultimate tensile strength and elongation were tested for both processes. The results show that both tensile and elongation of low pressure die casting specimens are higher remarkably than those in gravity permanent casting. The optimized aging parameter is heating at 175°C for 4.5 hours after solution treatment.
A Study on Influence of Shape of Aggregate on Strength and Quality of Concrete for Buildings and Pavements
Authors: Molugaram Kumar , Shanker Jaya S. , Ramesh Adepu
Published: June 2014

Aggregate characteristics of shape, texture and grading influence on workability, finishability, bleeding, pumpability and segregation of fresh concrete and affects the strength, shrinkage, density, and durability of hardened concrete. About 80% of total volume of concrete consists of aggregate. Construction and durability problems have been reported due to poor mixture proportioning and variation on grading. Aggregate characteristics significantly affect the performance of Quality Concrete (QC) both in fresh and hardened state and have an impact on the cost effectiveness. Flaky and elongated particles lead to higher voids than cubical, rounded and well graded particles. The shape factor of aggregate plays a vital role in the design and performance of QC mix and it is mainly depends on the rock formation and type of crusher being used for crushing the aggregates. Flaky and elongated particles have larger specific surface area which results in higher demand of cement paste in cement concrete mix. These particles impede compaction or break during rolling and decrease the strength of the concrete structures. An attempt is made to study the effect of shape of aggregate on quality of the concrete used for the buildings and pavements. Initially an aggregate samples were collected from the stone crusher (two types) and prepared with different proportions of Flakiness and Elongation indices to conduct tests on properties of aggregates and compressive strength and flexural strength tests on concrete. The effect of different percentages from 0 to 50% of combined Flaky and Elongation Aggregates (CFEA) for quality concrete on the compressive and flexural strength of cement concrete is studied. The other properties of aggregate such as bulk density, impact value, water absorption have been studied for different shapes of aggregates. The cost analysis has been carried out with an optimum value of 30% CFEA in 1:3 proportions of flaky and elongated particles.
Influence of Superplasticizer S-3 on the Technological Properties of Concrete Mixtures
Authors: Barabanshchikov Yury G. , Komarinskiy Mihail V.
Published: June 2014

In the process designing of concrete arise the problem - compatibility polycarboxylates with cement different parties. In some cases, when you receive the next batch of cement concrete mobility decreased sharply. Additive had to pick again. When choosing supplements examined its effect on the technological properties of concrete mixtures: workability, resistance to water gain, air entrainment. Test results showed that the addition of superplasticizer based on sulfonated naphthalene-formaldehyde resins (SNF) on the effectiveness of the plasticizing action is not inferior hyperplasticizer based polycarboxylate. Unlike polycarboxylates SNF additive has good compatibility with various cements, which provides stability regardless of the characteristics of the concrete mix to the vibrations of the chemical composition of cement. With increasing content of cement in the concrete superplasticizer efficiency increases, both in terms of workability, and in respect water gain of a concrete mixture.
Bearing Performance Test Research of Shallow Arch Circular Concrete Filled Steel Tube Support
Authors: Wang Jun , Gao Yan Fa
Published: June 2014

Concrete filled steel tube Support has a good load-bearing capacity, in this paper, shallow arch circular concrete filled steel tube support was designed, two kinds supports of Φ194×8 and Φ168×6 are to experiment according to shallow arch circular steel concrete structures and their load-displacement curves, ultimate bearing capacity and support failure mode are especially tested in experiment.
Research on the Influence of Fiber Web to the Axial Compression Performance of EPS Composite Insulation Wallboard
Authors: Wang Qing Hua , Feng Ye , Wang Rong Hui
Published: June 2014

To improve the axial compression mechanical properties of the EPS particle-EPS board composite insulation wallboard, added fiber web at different levels of it, got the best arrangement to improve the performance of axial compression through the test.
Electrochemical Behaviors of Q420 Hot Galvanized Plate in Simulated Concrete Pore Solution
Authors: Sun Qi Lei , Liu Ze Rui
Published: June 2014

The electrochemical behaviors of Q420 hot galvanized plate in the simulated concrete pore solution are studied by means of polarization curves and AC impedance. The result shows that, when the Q420 galvanized plate is in the simulated concrete pore solution, the stable and protective calcium zincate grains can be produced on the coating surface of the galvanized steel, so that the coating can enter the passive state and prevent the further corrosion of zinc in the alkaline environment. When the carbonification occurring in the concrete reduces the pH of medium or changes the medium environment due to the intrusion of Cl-, some small corrosion pores occur at the grain boundary of zinc grain first, then the calcium zincate grain Ca [Zn (OH)3]2·2H2O begins to be produced near the small pores, and with the gradual growth of calcium zincate grain, the zinc layer surface is gradually coated to form the protective layer with gradually increasing corrosion resistance. After the zinc base is fully coated by the calcium zincate grain, the corrosion current density declines to about the critical passive value, and the zinc layer is in the passive state. When Cl- enters the corrosive concrete environment, Cl- will destroy the primary corrosion product film calcium zincate covering the galvanized coating, so that the galvanized coating can enter the active state again.
Character and Development Analysis of Foam Concrete Cooperating Rice Husk Ash
Authors: Yu Cheng Cheng , Wang De Ling , Yang Kang , Li Shu Lei
Published: June 2014

The effect of rice husk ash (RHA) on foam concrete was studied. Firstly, performance and application of foam concrete was introduced in this paper. Secondly the character of RHA was described. RHA contains about 90% amorphous silica, which has high pozzolanic activity. Partial replacement of cement by RHA can enhance the strength of foam concrete in later age and improve durability, homogeneity and corrosion resistance. It also improves the pore structure of foam concrete, thermal insulation and sound absorption performance. Finally, development of foam concrete mixed with RHA was analyzed from following aspects: selecting and processing materials such as foaming agents, RHA and cement; optimizing production process of foam concrete. And since RHA is the major agricultural by-products of rice, it can reduce cost and environmental impact by replacing cement in foam concrete. As an environment friendly material, foam concrete cooperating RHA has great potential in construction field.
Hydraulic Performance of Olive Stone Filtration Systems
Authors: Carbone Marco , Garofalo Giuseppina , Nigro Gennaro , Piro Patrizia
Published: June 2014

In urban drainage filtration systems pass stormwater through a filter media, with the beneficial effects of reducing peak runoff rates and volumes, and retaining pollutants prior to discharge to groundwater or receiving surface waters. The use of filtration systems is advantageous in urban areas limited by space constraints, since such measures do not require high surface area availability. Recent literature has demonstrated that olive stones, which are by-products of olive-oil industry, may be re-used as filtration media for removing targeted stormwater pollutant such as heavy metals, organic matter and hydrocarbons. Although large research literature has investigated the chemical composition of olives and olive stones, only few studies have analyzed the hydraulic behavior of the olive stone. The aim of this article is to show the potential use of the olive stone as filtration system for stormwater, by investigating the hydraulic behavior of such filter media. In this study the hydraulic discharging rate of olive stones is explored for varying widths. This set of results will represent a valuable guideline for engineers in the design of olive stone filtration systems.
Development of the Equipment Combat Resilience Evaluation System Based on SPA
Authors: Zhang Deng Xia , Qiu Jian , Zhou Shao Hang , Zhang Jun Yong
Published: June 2014

The research on equipment combat resilience evaluation is an important part of equipment combat resilience. Based on analyzing the form and the function of the equipment combat resilience evaluation system, a set of intelligent and integrated evaluation system is designed and developed by using UML Object-oriented Modeling Language. The system can achieve economic, quick and effective evaluation results by applying the Set Pair Analysis .The theory result of the evaluation is consistent with the experiment result by an example of the combat resilience evaluation of certain fighter.
Modal Analysis of Portable Multifunctional Scooter Based on Solidworks
Authors: Huang Zhi Dong , Liu Shuo , Wang Chun Lian , Qi Xiu Biao , Yang Zhi Qiang , Lang Qing Yang
Published: June 2014

Based on the structure of common scooter, a new portable multifunctional scooter with carrying capacity is developed. Modal analysis of side wheel frame and carrying device on the portable multifunctional scooter is investigated by Solidwoks software. The first five orders natural frequency and major modes of the side wheel frame and carrying device are clarified. The method and the result can be used as a reference of dynamic design and lay foundation for calculation and analysis of dynamic response for the portable multifunctional scooter.
Research on Thermal Protection of One Gas Generator
Authors: Liu Zong Zheng , Zhao Bo , Chen Zhen Hua , Yu Cheng Guo
Published: June 2014

The thermal protection is a key factor to keep the gas generator work longtime under high temperature condition steadily. The main heat transfer paths are analyzed. A numeral simulation of the combustor and its nozzle shows the pipe outside temperature distribution with the change of time, position and thickness. According to the numeral simulation results, two thermal protection measures are bring forward, reduce the temperature, choosing proper thickness and heat resisting material. At last, an experiment results validate that the numeral simulation is credibility; the improvement of the structure is effective. With a longtime run, the outside wall temperature is 870K, which satisfies the operation needs.
Application of the Blind Source Separation Based on Time-Frequency Analysis in Mechanical Fault Diagnosis
Authors: Li Zhi Nong , Zhang Fen , He Xu Ping , Xiao Yao Xian
Published: June 2014

Blind source separation provides a new method for the separation of mechanical sources under high level background noise, as well as the diagnosis of the compound fault. At present, the blind source separation has been successfully applied to the mecanical fault diagnosis. But the traditional mechanical source separation methods are restricted to non-gauss, stationary and mutually independent source signals. However, the mechanical fault signals do not suffice to these conditions, and generally exhibit non-stationarity and non-independence. For the non-stationary signal, its spectral feature is time-varying. Thus only the time-domain or frequency-domain analysis is not sufficient to describe the characteristics of non-stationary signal. The time-frequency analysis, which can provide the information about that the spectrum of the signal varies with the time, is a useful tool for non-stationary signal analysis. In this paper, combined time-frequency analysis with blind source separation, a blind source separation method for the non-stationary signal of the mechanical equipment based on time-frequency analysis is proposed and studied. The simulation and experimental results show that the proposed approach is feasible and effective.
Position Tolerance Process Capability Prediction under Maximum Material Condition
Authors: Zhang Shuang , Gao Jin Gang , Wang Hua , Zhang Xiao Qing
Published: June 2014

Process capability prediction methods for position tolerance under maximum material condition were discussed in this paper. Due to application of maximum material condition the position tolerance specification varied individually for each part, percentage normalization and minimum gap methods were introduced to calculate the position process capability index. Link was taken as an example, true position percentage normalization and minimum gap of 30 parts were calculated. Considering the true position constitution relative to position tolerance at maximum material condition, related individual percentages were used to express the result and the same tolerance size 100% was obtained as for a unilateral tolerance. Set the acceptable value was 0, minimum gap between a hole and a simulated position gauge pin is studied instead of position. The process capability prediction results of two methods were calculated by Minitab software.
Fatigue Life Assessment of a Ship Unloader Crane
Authors: Xu Bin , Zhang Tao , Wu Feng Qi , Yan Zhen Rong
Published: June 2014

Ship unloader crane was widely used in transportation, and uploaded or unloaded cargoes from ships, which could influence efficiency and benefits of transportation greatly. In order to improve the reliability and safety, and decrease its risk in working flow, a method of fatigue life assessment was proposed in this paper. According to related standards and properties of risk, finite element method and experimental stress analysis were integrated to assess the working condition of a ship unloader crane. Finite element models of primary structures subjected to loads were built to achieve dynamic properties, which could supply a basic reference to experiment and guidance to locate the tested positions. Afterwards, wireless dynamic resistance strain-gauges were adopted to execute static and dynamic stress, and the tested results combined with finite element analysis were applied to strength analysis. Based on nominal stress and Miner principle, rainflow method was developed to fatigue life assessment of this ship unloader crane. The final results indicated that residual life of this crane was 4.67 years.
The Modular Design of the Valve Based on Solidworks
Authors: Xu Yong
Published: June 2014

In order to enhance the design level of the valve, brought in the modular design on the development of the valve, realized optimized design of the valve structure based on solidworks.
Design and Implementation of Knowledge System of Wireless Communication Equipment Fault Diagnosis
Authors: Yang Yu
Published: June 2014

Through analyzing the fault characteristics of the wireless communication equipment and according to the object oriented method, the fault diagnosis model based on knowledge for wireless communication equipment fault characteristics was designed. In order to expand and maintenance knowledge conveniently, and realize the reuse of knowledge, the fault diagnosis model were modeled in the way of domain knowledge, reasoning knowledge and task knowledge according to CommonKADS ideology. In the end VC++6.0 and SQL Server 2005 were used as the development tool and database, the development of prototype system was realized.
Algorithm for Tool Path Offsetting Based on NURBS Surface
Authors: Yue Ying
Published: June 2014

This paper presents an algorithm for tool path offsetting based on NURBS surface. First the progenitor free surface is fitted with a bi-cubic NURBS surface and the unit normal vectors of the NURBS surface is computed precisely, then the offset surface can be obtained by offsetting the NURBS surface in the normal vector direction with the required distance. Considerable extra computational time can be saved, especially when they are to be offset by several times. As the method successfully computes the unit normal vector of the progenitors, the offset error of this method is zero. The method can also be generalized to other degree NURBS surface, and it can improve the machining accuracy of the surface.
Variable Speed Estimation for Wheel-Bearings with STFT and BP Neural Network
Authors: Zhou Yuan , Chen Bin , Gao Bao Cheng , Zhang Si Jie
Published: June 2014

For the variable speed estimation of wheel-bearings in strong background noise, a novel method with the short-time Fourier transform and BP neural network (STFT-BPNN) is proposed. In the method, it calculates the time-frequency spectrum with STFT technique. Then the instantaneous frequency is estimated by peak detection. Taking the instantaneous frequencies as the input vectors, the BP neural network is trained to fit the discrete instantaneous frequencies. The effectiveness of proposed method is demonstrated by simulation. Experimental results show that proposed method provides better performance on variable speed estimation for wheel-bearings.
Numerical Simulation on Controlling Factor of Energy Distribution in Coal Bump
Authors: Li Hai Tao , Jiang Cong , Liu Jiao Xia
Published: June 2014

Elastic energy that cause coal bump will be stored in coal and rocks when excavating, which has a relationship with time and space. Based on analysis of "7.16 coal bump" accident in Cheng Shan coal mine, 3 impact factors including stability-time, goaf and roof strength were confirmed, then the distribution of energy under different conditions was simulated with Flac3D, the result showed that, 3 mentioned factors all have an impact on energy, and the impact descending order of these factors is: goaf, roof strength and time, while the controlling factor of this accident is goaf.
Reliability Analysis of Composite Structure Using ANSYS Software
Authors: Zhao Wei Tao , Guo Feng , Li Xiao
Published: June 2014

ANSYS software has provided complete and accurate solutions for composite laminate analysis and provided a set of special elements for different composite structures such as laminated plates, beams, solid structures and stiffeners. Fiber composite materials have been widely used to critical components of aircrafts, automobiles, mechanical, and marine structures. Since uncertainties associated with geometric tolerances, material properties, and boundary conditions widely exist in practical engineering problems. The probability approach is the most popular way to quantify uncertain parameters and perform the reliability analysis. The paper researches on the reliability analysis of the composite panels using ANSYS software. The numerical example is given, it is shown that the response surface method (RSM) can reduce the computational efforts comparing with Monte Carlo simulation (MCS).
Reliability and Sensitivity Analysis of Laminate Using Different Methods
Authors: Zhao Wei Tao , Li Xiao , Guo Feng
Published: June 2014

Reliability of laminate structure is deeply influenced by uncertainties such as fiber properties, loads and design sizes. It is very difficult to evaluate the reliability and sensitivity of laminate structure because that laminate structure is anisotropic and the limit state function (LSF) is a high nonlinear function. In this paper, reliability and sensitivity are evaluated by using first order reliability method (FORM), response surface method (RSM) and Monte Carlo simulation (MCS). The study aims to find a numerical method to evaluate the reliability and sensitivity of laminate structures efficiently and accurately. An example of laminate with a large number of variables is analyzed. The results obtained by using different methods are compared in terms of efficiency and accuracy. It is shown that FORM is not accuracy, and RSM has a very good accuracy and efficient in terms of reliability, but the accuracy of sensitivity obtained by using RSM is not good enough.
Shock-Resistance Research of Ship Structural Subjected to Underwater Explosion
Authors: Xie Yao Guo
Published: June 2014

A finite element model ships, for example design test condition of the underwater explosion, selection of explosive package quantity is 1000KG TNT, the explosive location along the direction of the ship with the bow, midship and stern, the angle of attack in three exploded cross section have 90 degrees, 60 degrees, 45 degrees, 30 degrees and 0 degrees. According to the current standard to calculate the ship damage radius, critical radius and safety radius of specific values under the effect of underwater explosion, interpolation calculation and draw the envelope. Analysis shows that the vitality of ships and shock-resistance is not only related to the explosive distance, also related to the attack position.
Study of the Precursory Rules of a Deformation Localization of Coal Specimens
Authors: Zhang Rui Xi , Jiang Cong , Lv Yu Kai
Published: June 2014

The instability failure of coal and rock mass occur frequently in deep mining. However, this destruction occurs with abnormal intensity and suddenness, with hardly any obvious macro precursors. The ability to extract this precursory information and make certain the relationship among the parameters is therefore important. During the process of instability and failure of coal samples, the evolution characteristics of deformation field were monitored by digital image correlation system. Base on the researches, the appearance of the deformation localization band could be divided into three time periods for the samples which all had splitting failure. During period I, the relative sliding component increased rapidly. During period II, the relative tension component increased rapidly. During period III, both the relative tension and relative sliding components increased rapidly.
The Modal Analysis with Finite Element Method for Body Section of EBZ160 Roadheader
Authors: Dong Zhi Feng , Fang Li Yu , Dan Gong , Deng Chuan Feng
Published: June 2014

Body section is the main part of the roadheader and its stability had serious impact on the working efficiency and the stability of roadheader. It is under all the dynamic impact from the other parts of roadheader. Since complex force condition, violent and irregular vibration, the stability of body section is particularly important and the mechanical parts design plays very important roll to the EBZ160 Roadheader. The paper gets the vibration modes, maximum amplitudes of the body section and where they appear by modal analysis of two main parts of the body section whose maximum order is five. According to the result, more attention must be paid to the complex force condition, violent and irregular vibration of the body section in the design.
A sliding Mode Control of Active Suspension Using H2/GH2 Approach to Surface Design
Authors: Liu Shu Bo , Luo Xian Xi , Wan Zhi Hui
Published: June 2014

This paper considers a new H2/GH2sliding mode control in controlling active suspension system subject to mismatched disturbance, without requiring a prior knowledge of disturbance. A quarter-car model is used in the study and the performance of the controller is compared with the existing passive suspension system. A simulation study is presented to prove the effectiveness and robustness of the proposed control method.