bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Optimization of Filling Path Algorithm in Rapid Prototyping Technology
Authors: Fan Li Rong , Ren Chong , Cao Yi Qing
Published: April 2012

According to the Rapid Prototyping for uniform thickness of thin-wall parts forming, the paper uses the filling method that is mixed the parallel lines with contour trajectory offset lines, based on the both of filling methods that conducted a research on the algorithm and derivation of mathematics, gets the mathematical expression of the both filling track line. The algorithm for Rapid Prototyping system which can achieved software optimization provided a mathematical foundation.
The Research & Modeling of Area Navigation System Simulation
Authors: Guan Song , Sun Ping Bo
Published: April 2012

Area navigation allows aircraft to fly along any airways that are applicable within the effective distance which navigation system or airborne navigation equipments can offer. Aircraft can fly in air district that is applicable with required precision, rather than fly to or fly from the navigation station on ground. This paper researches mathematical model of RNAV based on VOR/DME; analyzes the error affects on RNAV as well as GDOP. Use Matlab/Simulink to simulate and analyze the modeling; validate the accuracy and feasibility of the mathematical model.
Study on Corrosion Acoustic Emission Separation Based on Blind Source Separation
Authors: Yu Yang , Zhou Xiang
Published: April 2012

When corrosion signals of tank bottom is detected by online method, it is essential to identify corrosion signals of different corrosion pots. It is a new method based on blind source separation. Blind source separation has produced many arithetics, among which entropy maximization is more mature. The aim of this paper is to separate corrosion signals by using entropy maximization arithmetic. Furthermore, the separation of linear mixed acoustic emission signals is achieved through simulation. The results indicate that blind source separation is an effective method for the separation of corrosion signals.
Combustion Control Strategy Based on Radiation Energy Signal in Furnace of Supercharged Boiler
Authors: Zhou Guo Yi , Su Gao , Du Fei , Li Zhong Gen
Published: April 2012

There is a diathermaneity process between the fuel combustion and generate steam when the supercharged boiler is working. That is to say there are large time-delay and large fluctuation when it’s been regulated. In this paper, the relationships between radiation energy signal, fuel consumption and the heat absorption rate of the raiser were analyzed. The radiation energy signal in the furnace was introduced into the original control system as a feedback signal. A combustion auxiliary control circuit was added to form a new control strategy and the simulation model was established.
Analysis of Metal Magnetic Memory Testing Technology
Authors: Lin Guo Min , Lin Hang Yun , Dong Kai
Published: April 2012

The magnetic memory effect and the principle of magnetic memory testing are described; The phenomenon of the magnetostriction is discussed. An instance is used with detail to analysis of the effect and mechanism of metal magnetic memory testing technology. Some opinions about the further work needs to be done in this area are given finally.
Fluid-Solid Coupling Numerical Simulation for Tunnel in Fracture Zone Based on 2D-FLAC Software
Authors: Lai Jin Xing , Fan Hao Bo , Zhou Fei
Published: April 2012

To understand the stressed characteristic of fault rupture zone under high hydraulic pressure, based on the F3 fault of Guanshan tunnel the software 2D-FLAC is adopted to found the fluid-solid coupling numerical model of ground water seepage and evolution in the process of tunnel structure in fault rupture zone under high hydraulic pressure and analyze the mechanical character of tunnel structure in three schemes of whole block, free discharge and limit discharge. The result shows that in the whole block condition, the partial seepage of ground water happened and the lining thickness should be more than 60cm; Regardless of water pressure, the rock is damaged at a large range, and the minimum safety factor of the lining structure meet the tunnel design standard; In the limit discharge condition, the grouting reinforced ring makes the effect of limiting drainage and keeping the tunnel’s stability in the construction. The tunnel drainage gets smaller with the increase of grouting ring’s thickness and the decrease of grouting ring’s penetration parameter; setting the drainage system can decrease the hydraulic pressure at the back of lining as well as grouting and water blocking.
On-Line Monitoring of Charge Unit by Using Fiber Bragg Grating Temperature Sensors
Authors: Yang Zhao , Xu Xiao Ping , Li Chuan , Chen Yan , Xu Jiang Chun , Li Ying Na , Xu Yun Shui , Yan Qing Hua , Zhan Shao Quan
Published: April 2012

The charge unit supply power when the power is cut off. It has been the necessary components in every type of substations to ensure the continuous operations of electric relays, automatic devices and circuit breakers. By using contacting electrical insulating Fiber Bragg Grating temperature sensor, the monitored equipment can be measured and controlled under the safe temperature. The temperatures of three fans and environment have been surveyed since June 6, 2010, in the charge unit of Yanjin substation’s main control room. The real-time monitoring of 24-hours indicates that the temperature changes in the range of 1°C. At the long-term of 479 days, the average daily minimum temperature range of three fans is 12.48°C, and the maximum range is 23.07°C. The maximum temperature is 39.14°C on April 30, 2011, and the minimum temperature is 23.98°C on January 10, 2011. The daily average of ambient temperature range is 12.04 °C, the maximum temperature is 38.38 °C on July 16, 2010, and the minimum temperature is 26.34 °C on January 9, 2011. The maximum difference between the temperature of fan and the ambient temperature is 7.60 °C on October 23, 2010. According to the relevant standards and monitoring results, the maximum threshold of fan temperature is defined to 85°C, and the threshold of temperature rise is 20°C.
The Application of the Tension Online Detection and Control Technology
Authors: Wang Xian Fang , Ren Xue Qin , Li Wen Ya
Published: April 2012

The main contents of this article are the practical application of a new technology about the tension online detection and control, including the tension control in the production process and the winding process. For example, the optical fiber winding, the winding of roving, the winding of loose cone frame, special fancy yarns winding and so on. The new function is so strong that can be used in many aspects, which can meet the special production requirements and improve the product quality.
Research on Pretreatment Process and Product Detection in Enzymatic Hydrolysis of Lignocellulosic Biomass
Authors: Zhao Jing Jing , Yang Hai Yan , Li Bo , Chen Fu Ming
Published: April 2012

Sulfite pretreatment was explored in enzymatic hydrolysis of bagasse for the first time, and was compared with dilute acid pretreatment. The results showed that enzymatic hydrolysis yield of bagasse after sulfite treatment was lower than that of the bagasse pretreated with dilute acid. Meanwhile, complexity of sulfite pretreatment and its high cost made it infeasible for industrialized production. Results also showed positive correlation of bagasse pretreatment weight loss to enzymatic hydrolysis yield in dilute acid pretreatment processes, which made substrate weight loss a plausible parameter in pretreatment evaluation.
Surface Design of Molding Tool for Composite Component Based on Reverse Engineering
Authors: Wu Da Wei , Ding Xiao Fei , Tong Gang
Published: April 2012

This paper analyzes the structure of molding tool for composite component, and proposes a method of surface design of molding tool based on reverse engineering. By using handy laser scanner, the point cloud data is obtained from the composite component, which is processed in Geomagic Studio. Then the processed data is imported into CATIA for Surface fitting. The surface of molding tool for composite component is rapidly and accurately designed by analyzing 3D error and comparing cross-sectional data.
Design and Knitting Technology of Maifan Stone Fiber Knitted Fabrics
Authors: Shang Li Ming , Meng Jia Guang , Ren Cai Ling
Published: April 2012

This article mainly describes the development and design of maifan stone fiber blended yarn knitted fabrics for the six textures, focus on the key points of knitting and knitting process, studies on basic structural features of knitted fabrics, and testes on the basic properties of fabrics. It is showed from the testing result that pure maifan stone fiber is suitable for developing knitted fabrics
Design and Realization of FIR Band-Pass Digital Filter Based on MATLAB
Authors: Ren Shan , Zhao Xin , Jiang Jie , Zhao Dong Jin
Published: April 2012

Digital filter is one of the most important parts of digital signal processing. In practice, digital signal processing often need to limit the signal observation time interval within a certain time, choose only one period of signal that signal data will be truncated, this process is equivalent to plus window function operation to signal. In order to obtain finite unit sample response, need to truncate the infinite unit sample response sequence by window function. This paper proposes the method of using window function to design FIR Band-pass filter based on MATLAB, according to the design basic principle of FIR digital filter. Filtering processing for measured signal showed that filtering effect of the filter achieved the expected results.
Design of the Key Units Fire Electronic Plans System Based on Virtual Reality Technology
Authors: Pei Qiu Hong
Published: April 2012

At present, fire electronic plans of the key units are not intuitive. Reading the fire plans of key units, fire commanders and soldiers still need to focus on the units to the field which is familiar with the building structure to drill for the strategic plans. That increases an additional workload. Using virtual reality technology firefighters will be able to intuitively grasp the key units of the actual fire. Such as it can provide strong support for fire fighting, assist firefighters to arrive the proper disposal of fire. Thus it will reduce the blindness of the rescue operation, protect the safety of firefighters and increase the fire fighting effectiveness.
A New Characteristic Index BT of the Humidity Controlling Material in a Greenhouse Space and its Theoretical Basis
Authors: Li Chun Long , Chen Wei , Li Zheng Yang , Wei Feng Lan
Published: April 2012

In this essay, the charactristc index of the humidity controlling material is breifly illuminated, based on which, an observing experiment in a small enclosed box is made. According to the experimental phenomenon and the basic principles of the thermodynamics, the formulation of the humidity parameter in a closed space of greenhouse is derived, from the angle of two-phase equilibrium. We assert that the purpose of using B,the charateristic parameter, is to ensure that the temperature of the subjest is zero. So when the temperature is not zero, using this parameter will cause error. Since the imperfection of B, it is necessary to use another parameter, BT, which is derived according to the temperature of the subject and proved more reasonable, to reply the former one. Both parameters can reflect the combination of the material and the moisture, which relate to the binding energy. The humidity controlling character proves better, if the binding energy becomes closer to that of two pure water molecules.
Research of Parts’ Clustering Method for the Multi-Design Objective
Authors: Wang Ding Lei , Li Jian Yong , Xu Wen Sheng
Published: April 2012

The goal of product design is to meet the anticipated design goal. The market demands of congeneric products have difference in type of construction and quantity, so the design objective of products shouldn’t be same. The process of product’s modularization should accommodate the multi-design objective. It should be taken into account in the process of parts’ clustering not only the parts’ feature but also specific service condition of the parts. The rules and the its factor weight are determined impersonally by the method of AHP(Analytic Hierarchy Process) for the different goal. The different calculated methods are adopted base on the different character between the parts’ interaction values, and the objectivity and accuracy have been improved. The effectiveness of the clustering method has been proved by an example and the different clustering results have been found for different design goal.
Bending of Thermoviscoelastic Functionally Graded Materials Beams
Authors: Wang Ming Lu , Wei Gao Feng
Published: April 2012

According to the constitutive relation of linear thermovisoelasticity, with the help of Laplace transformation method and the introduction of structure functions and thermal functions, the mathematical model and its corresponding variational principle for thermoviscoelastic FGM beams are set up on the basis of the assumption that plane section remains plane and normal to the beam axis. Using Laplace transformation method, the deflection and the stress distribution are discussed.
Simulation of Proton Irradiation Damage for Fe-Ni Magnetic Alloy
Authors: Cao Bo , Yang Tong Rui
Published: April 2012

The Fe-Ni magnetic alloy irradiated by 10 MeV and 20 MeV protons were simulated by TRIM program. The energy loss and irradiation damage were calculated, and some important results were concluded. The average number of vacancies of the irradiation with 10 MeV and 20 MeV protons are 131.7 and 214.5. The damage rate of the Fe-Ni magnetic alloy irradiated with 10 MeV and 20 MeV protons are 2.278×10-6 dpa/s and 1.227×10-6 dpa/s. For the 1µA protons, in order to reach the radiation damage dose of 2 dpa, it will need 244 h and 453 h irradiated by 10 MeV and 20 MeV protons respectively.
Stress Analysis in Ceramic Inlays Restored Premolars
Authors: Sandu Liliana , Topală Florin , Porojan Sorin
Published: April 2012

Ceramic inlays can be used on premolars requiring a MOD restoration instead posterior composite resins direct restorations and offer a durable alternative. Because it is known that MOD inlays may increase the susceptibility to fracture, it is important to ensure optimal performance in selection of the adequate preparation design to reduce stresses in teeth structures and also in the restorations. The aim of the study was to determine, using finite element analysis, the optimal shapes of ceramics MOD inlays in premolars in order to minimize the potentially damaging effects of stress on teeth structures and restorations. The study was performed on an upper first premolar, using a finite element analysis. 3D models of maxillary first premolars, prepared for MOD inlays with different tapers were generated. The mesh structure of the solid 3D model was created using the computational simulation of Ansys finite element analysis software. An occlusal load of 200 N was conducted, and stresses occurring in the ceramic inlays, and teeth structures were calculated. The study provides a biomechanical explanation for inlays restored teeth. MOD inlays transfer functional stress to the teeth structures. The taper of the preparations had no significant influence on the stress values for all the studied cases.
Research on the Microstructure and Mechanical Properties of ZGMn13Cr2 Strengthened by Nano-SiC Master Alloys
Authors: Yu Hui Wu , Wang Wen Yan , Xie Jing Pei , Zhou Pin Gan , Li Yan , Wang Jia Xi , Shao Xing Hai
Published: April 2012

The ZGMn13Cr2 reinforced by the nano-SiC master alloy is investigated in this paper. The nano-SiC master alloy which comprise nano-SiC powders and other metal powders are prepared, then the nano-SiC master alloy is added into the ZGMn13Cr2 samples under industrial conditions. The morphology and mechanical properties of the samples are studied. The results show that: When the nano-SiC Master Alloy is added into the sample, the microstructure of ZGMn13Cr2 improve significantly and the absorbed energy of the samples increased obviously.
Glucose Biosensor Based on Immobilization of Glucose Oxidase on Silica Nanoparticles Modified Au Electrode
Authors: Sun Ying Ying , Zhao Shuang , Ren Qun Xiang
Published: April 2012

A feasible method to fabricate glucose biosensor was developed by covalent attachment of glucose oxidase (GOx) to a silica nanoparticle monolayer modified gold electrode. Electrochemical impedance spectroscopy (EIS) of ferrocyanide followed the assembly process and verified the successful immobilization of GOx on silica nanoparticle modified on gold electrodes. Cyclic voltammetry (CV), performed in the presence of excess glucose and artificial redox mediator (ferrocenemethanol), allowed to quantify the surface concentration of electrically wired enzyme. The signal of proposed electrode was more than 2.5 times of that on electrode lacking silica nanoparticles. As a result, silica nanoparticles are a good biocompatible solid support for enzyme immobilization.
Residual Stresses Distributions within Thin-Walled Ceramic-Metal Seal
Authors: Zhang Guo Liang , Shi Lei , Jin Da Zhi
Published: April 2012

Due to significant difference of thermal expansion coefficients between ceramic and metal, the residual stresses are deemed to be induced into the interior of matrix composites within the ceramic-metal seal systems. Many investigations of the residual stresses distributions on dissimilar solid materials joints so far have been carried out theoretically and experimentally, whereas ones of the residual stresses distributions within the thin-walled ceramic-metal seal systems are rarely performed. In order to obtain information for improving their seal structures in the future, the residual stresses distributions resulted from the thermal expansion behavior in the typical configuration of the thin-walled ceramic-metal seal are investigated by theoretical formulae, experimental observation and finite element method (FEM) simulation in this paper. The changing trends of the computational results of the residual stresses distributions agree with the experimental results of the measurement with X-ray diffractometer. The overall residual stresses are found to increase drastically near the welding interfaces. The highest tensile stress occurs at the outer surfaces of the ceramic near the welding interfaces.
Mechanical Properties of SUS301L Stainless Steel Welded Joints for Railway Vehicles
Authors: Zhan Lan , Shi Chun Yuan
Published: April 2012

The tensile and the fatigue tests of three different rolling states of SUS301L stainless steel welded joints were investigated, and their S-N curves were obtained and analyzed. The typical fracture morphology of fatigue specimens were observed by scanning electron microscopy (SEM). The results indicate that the tensile strength and the yield strength of three kinds of SUS301L stainless steel welded joints increase with increasing of rolling degrees, while only the elongation rate decreases with the increasing of rolling degrees; the median fatigue limit of SUS301L-DLT、SUS301L-ST、SUS301L-MT for fatigue life 2×106 cycles are 247.5MPa, 331MPa, 266.7MPa.
Study of the Metallographic of Nickel-Titanium Alloy Material by Using Electrochemical Polish Method
Authors: Fu Ji Song , Wang Qiang , Liu Jian Nan , Cong Zhe Lin , Yin Shi Lei
Published: April 2012

poly-crystal nickel-titanium （NiTi ）has been a potential material,because of its good superelasticity, radiopacity and shape memory properties .To study further on this material (such as mechanical characteristic,elasticity), microcosmic properties of NiTi must be known. Therefore the crystal structure seems to be very significant for research.Traditional metallographical technology makes use of mechanical polishing and corrosion.In this work,a new method of electrochemical corrosion is put forward ,which is more easily and clearly to show the crystalline grain of metal
Property Research on Cooling-Mica Fiber and Yarn
Authors: Liu Bian Xia , Meng Jia Guang , Li Wei Tao
Published: April 2012

In this article, morphology, IR and single fiber strength of cooling-mica fiber, and single yarn strength, yarn hairiness, twist, yarn evenness, resisting acid and alkali have been studied and tested.
Phases and Thermoelectric Properties of Bulk NiSb2 and Composite of NiSb2 and CoSb3 Prepared by Sintering
Authors: Liu Ke Gao , Ji Nian Jing , Ma Zhong Quan
Published: April 2012

For researching the thermoelectric properties, bulk NiSb2 and the composite of CoSb3 and NiSb2 were prepared by sintering. The phases of samples were analyzed by X-ray diffraction and their thermoelectric properties were tested by electric constant instrument and laser thermal constant instrument. Experimental results show that, Bulk NiSb2 and the composite of NiSb2:CoSb3=2:8 and 4:6 were prepared by sintering at 600°C for 10min and they are N-type semiconductor materials with high densities of 6.998~7.142g/cm3. The bulk NiSb2 sample sintered is nearly single phase NiSb2, while the major phases of the composite of NiSb2:CoSb3=2:8 are major phase CoSb3 with impurity phase NiSb2. The electric resistivity of bulk NiSb2 sample increases with temperature rising while those of the composites (NiSb2:CoSb3=2:8 and 4:6) increase at 400~500 °C. The absolute values of Seebeck coefficients of the composite samples (NiSb2:CoSb3=2:8 and 4:6) increase with temperature rising and are evidently higher than those of bulk NiSb2. The power factors of the composites (NiSb2:CoSb3=2:8 and 4:6) are evidently higher than those of bulk NiSb2 while the power factor of NiSb2 sample varies not obviously with temperature rising, but those of the composites (NiSb2:CoSb3=2:8 and 4:6) increase with temperature rising and reaches the maximum value of 21.3 10-4Wk-2m-1 at 500 °C.
Development and Application of Series Re-Calibration Samples of Copper and Copper Alloy
Authors: Li Yue Hong , Yuan Huai Bao
Published: April 2012

In accordance with the requirements of the reference materials technical specifications, refer to some countries’ existing standards of chemical composition of copper and copper products, design the chemical composition of each re-calibration samples. Using proper methods of batching, smelting technique and extrusion processes etc., developed a set of re-calibration samples of copper and copper alloy. These samples are mainly used for standardization of photoelectric direct reading spectrometer instrument, to meet the re-calibration of various elements of Cu, Pb, Fe, Ni, Bi, Sb, P, As, Al, Zn, Mn, Si, Sn, Cr, Cd, Zr, Mg, S, C, Ag, Co, Se, Te in the copper, brass, bronze, copper-nickel and other copper alloy. Determine the content of the various elements using a variety of methods, these samples can also act as control samples for the control analysis of the relevant elements separately. In comparison with existing international re-calibration samples, the series of samples have advantages of small quantity, wide coverage, more reasonable distribution of elements.
Research on the Performance of the Germanium Fiber and Yarn
Authors: Yang Ji , Liu Yan Jun
Published: April 2012

The main work of this paper is the test of morphological structure and Infrared spectrum of Germanium fiber , strength、humidity content、fineness uniformity、humidity content and resistance to acids and bases of Germanium yarns, to prove that the special properties of the Germanium fiber yarn suitable for the production of health next-to-skin apparel. Aimed at providing the relative theoretical guidance and preparation of personal clothing and fabrics when to use the Germanium fiber blended yarn for producing the next-to-skin apparel in the textile sector .
Studies on Properties of Outlast Air-Conditioning Fiber and Blended Yarn
Authors: Zhao Cai Xia , Meng Jia Guang , Zhi Chao Zhi
Published: April 2012

This article first introduces the properties and tempering principle of outlast air-conditioning fiber. Then a series of tests, including morphological structure, infrared spectral analysis, fineness, single fiber strength and yarn strength, fineness uniformity, absorbency, moisture content, yarn hairiness, and acid and alkali resistance, has been respectively done to study the basic performances of the fiber and yarn, and the results of test were analyzed and evaluated systematically.
Self-Cleaning Method for Large Solar Cell Array Based on Travelling-Wave Dielectrophoretic Force
Authors: He Gao Fa , Zhou Chuan De , Li Ze Lun
Published: April 2012

The self-cleaning technology for solar cell array can promote efficiency of electricity produced and protect the solar cell. In this paper, a method of dusts-removal based on travelling-wave dielectrophoretic force was proposed. The theory of travelling-wave dielectrophoresis and the adhesion model between the dusts and the surface of the solar cell array were analyzed. According to the theory and the fabricating process of the film, the structure of the self-cleaning film for large solar cell array was designed.
Preparation and Properties of Cu-10Sn Alloy Infiltrated 316L Stainless Steel Composites
Authors: Yang Xia , Bai Ying Long , Xu Meng , Guo Shi Ju
Published: April 2012

A new method to produce powder metallurgy (P/M) 316L stainless steel matrix composite by pressureless infiltrating Cu-10Sn alloy was studied. The effect of various compaction pressures and infiltrating temperatures on the microstructure, mechanical properties and corrosion resistance was investigated. The results show that high density P/M 316L stainless steel matrix composite could be achieved by infiltration. A maximum relative density of 98% was achieved, provided that the porosity of the skeleton was controlled at 18%~22%. After infiltration, hardness of the samples increased from 49 HRB to 89 HRB. Moreover, the critical corrosion potential reached -212 mV, close to the level of as cast 316L stainless steel. The hardness of infiltrated composite of the same density decreased with increase in initial skeleton density. It was necessary to prevent the egregious grain growth while the infiltrating temperature was too high.
The Characteristics of Infrared Spectra of Kenaf Fiber and its Composite Material
Authors: Wu Zhen Xiu , Sun Ting , Wen Hong Feng , Zhang Tao
Published: April 2012

Kenaf fiber modification, its composite material and its basic PE structure were studied by infrared spectrum and SEM in this paper, the research results show as following: 1730 cm-1 peak in Kenaf fiber clearly becomes weak and 1647 cm-1 peak reduces even disappears via KH-550 coupling treatment. The reaction intensity increases between C-O bonds in 1070 ㎝-1 and C-O-C bonds in 1160㎝-1 with coupling reaction. After KH-550 silane coupling treatment, Kenaf fiber’s C=O bond at 1750 ㎝-1 and PE composite material’s -OH bond at 1250㎝-1 weakens obviously, result in a better compatibility, which is consistent with mechanical property and SEM microstructure of composite materials.
The Influence on Proton Conductivity and Methanol Permeability of SiO2/PVA-PAMPS Composite Membrane
Authors: Yuan Chun Hua , Guo Gui Bao , An Sheng Li
Published: April 2012

Polyvinyl alcohol(PVA) modified by SiO2/poly 2-acrylamido 2-methylpropane sulfonic acid (PAMPS) electrolyte membrane (SiO2/PVA-PAMPS ) was prepared by a Sol-gel synthesis in situ technique for DMFC. The influence of the different ratio of AMPS and SiCl4 on the proton conductivity and methanol permeability of these membranes was studied using an impedance analyzer and a gas chromatograph. The results showed that with increasing of the content of silicon dioxide, the SiO2 was homogeneously distributed in the membrane. As the AMPS content increased, the proton conductivity of the SiO2/PVA-PAMPS membranes also increased. The swelling degree of the SiO2/PVA-PAMPS membrane with 30wt% SiCl4 and 20wt% AMPS was 28.79% at 25°C. The membranes possess a methanol permeability of around 10-7 cm2•S-1, which is about one order of magnitude lower than that of Nafion115. These membranes have high selectivity and are promising for use in direct methanol fuel cells (DMFC).
The Degradation of Methyl Orange with NiO/γ-Al2O3 Photocatalyst by Plasma-Assisted Preparation
Authors: Xie Dan Yang , Li Qiu Rong , Xiao Hai Yan , Lu Hong Xiao , Wang Ran Ran
Published: April 2012

This paper reports NiO/γ-Al2O3 photocatalysts have well photocatalytic degradation capacity. NiO/γ-Al2O3 catalysts were prepared by Ni(NO3)2•6H2O,γ-Al2O3 with the impregnation method, and treated by the plasma-assisted, which were characterized by XRD, FT-IR,BET and other analytical tools. The influence factors of methyl orange degradation efficiency were analyzed under the 250W high-pressure mercury lamp.
Study on Synthesis of Ni-S Powders Synthesized by Hydrothermal Co-Reduction
Authors: Cai Yuan Xing , Liu Ke Gao
Published: April 2012

The technologies of synthesizing Ni-S powders from 0.001 mol NiCl2•6H2O and 0.001 mol sulfur (S) powder were investigated at 95,105,120,140 and 160 °C. The phases and morphology of the products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) respectively. Experimental results show that, the Ni-S powders prepared at 120~160 °C from NiCl2•6H2O and S powder have the same major phase NiS. These products have flakes or unregular shape grains with sizes of 100~200nm. However, the product powder prepared at 105 °C has the major phase Ni3S2 without obvious impurity phases and only grains with size less than 200nm. No Nickel sulfides can be synthesized at 95 °C under the experimental conditions. It can be found that the NiS phase appears in the products powders obtained at higher temperatures while Ni3S2 obtained at lower temperature.
Finite Element Analysis to Ceramic Ball Pure Rolling Contact Stresses
Authors: Zhou Jing Ling , Zhu Wei Nan , Wu Guo Qing , Ren Yu Song
Published: April 2012

The RCF (Rolling Contact Fatigue) life of bearing balls is a main method, to evaluate the performance of bearing materials and their production technology. In general, The RCF life of ceramic balls is a reliable technique to asses whether or not they are suitable to be used in rolling bearings. The RCF life of ceramic balls is depend on contact stresses chiefly. It applies the finite element analysis to calculate the surface stresses and subsurface stresses, including 1st principal tensile stresses and shear stresses. The theory results are compared with the finite element solutions. Very good agreement is observed. The finite element results in this paper have an important applied value. The results provided theoretical basis for rolling contact fatigue life prediction of the ceramic balls.
Research on Mining Machinery Gear Materials
Authors: Gao Chao Xiang , Wang Chong , Ren Xiao Hong
Published: April 2012

For many problems and defects in 20Cr2Ni4 steel application, through the analysis of mining machinery gear working condition, comparative study in cutting, forging, carburizing layer performance, heat treatment process, heat treatment deformation, mechanical properties, deformation resistance and abrasion resistance of overload capacity of 20CrNi2Mo and 20Cr2Ni4 steel respectively. The results show that, using 20CrNi2Mo steel instead of 20Cr2Ni4 steel in the mining machinery heavy-duty gear is feasible.
Experimental Research on Ultrasonic Vibration Turning of Finish Machining Technology
Authors: Zhu Lin , Nan Ying Fei
Published: April 2012

The finish machining test is using the ultrasonic vibration turning, and a lot of experimental researches have done on the factors which influence the finishing surface roughness, It is determined a reasonable cutting parameters by comparing test and orthogonal test, analyzed some of the factors which influence the surface quality, and made a test analysis and verification for promoting the use of finishing technology of ultrasonic vibration turning, and in the same time analyzes the superiority and regularity of finish machining technology using ultrasonic turning.
Flow Field Analysis and Numerical Simulation for Pipe with Tee on Fluid-Structure Coupling
Authors: Liu Zhong Bin , Luo Feng , Zeng Tao , Wu Hui
Published: April 2012

Y-shaped tee is modeled by three-dimensional graphics software and its flow field is analyzed and numerical simulated by CFD software. The mechanical stability of Y-shaped tee in the work process is analyzed by fluid-structure coupling. The results show that the pressure of water is gradually decreased and the velocity of water is gradually increased as the main flow is near Y-shaped tee; the branch of pipeline exits the largest failure risk by the coulomb failure expression. Simulation results are consistent to the practice, which provides important theoretical basis for improving and optimization of Y-shaped tee.
Magnetic Memory Testing and Intensity Failure Analysis of Fractured Bolt of Cylinder Head on Hydrogen Gas Compressor
Authors: Yu Jiang Hong
Published: April 2012

Along with the wide application of pressure energy, large scale reciprocating compressor unit is becoming one of the necessary key equipments in petrochemical industry. The reciprocating compressor has complicated structure and it is very difficult to carry out measurement & analysis to the operation status of various components. Above all, as the most important fastener of the compressor, once fracture of cylinder head bolt of the reciprocating compressor occurs, major disaster will occur. Metal magnetic memory testing technology is a nondestructive examination technology based on magneto-mechanical effect principle. Specific change of leakage magnetic field will occur in stress & deformation concentrated region under combined action of alternate work load and geomagnetic field, macroscopic cracking can be detected and stress concentration and early state damage can be evaluated by utilizing this specific change, We carried out on-site examination on the fractured bolt of cylinder head of hydrogen gas compressor unit in refinery of certain petrochemical corporation with latest metal magnetic memory testing technology. On the basis of intensity analysis and dynamic load calculation to cylinder head bolt of the reciprocating compressor, we analyzed the cause of bolt fracture by using metal magnetic memory testing technology and drew out the magnetic memory signal distribution characteristics of the bolt and its fracture. We verified the correctness of testing result of the metal magnetic memory technology on cylinder head bolt and its fracture with metallographic examination technology; furthermore, we studied the reliability of bolt fatigue crack & fracture analysis and investigation of accident cause by using magnetic memory characteristic distribution signal.
Reliability-Based Assessment of the Effect of Climatic Conditions and CO2 Emissions on the Corrosion of RC Structures Subjected to Carbonation
Authors: Liu Jun Li , Fang Zhi
Published: April 2012

carbonation rate of concrete structures are influenced by CO2 emissions and climate conditions. Carbonation depth prediction model was proposed and CO2 emission scenarios influence on concrete structures' carbonation damage was studied. As there are significant uncertainty and variability of CO2 emissions, deterioration mechanisms, material properties, dimensions and environments, the time-dependent structural reliability analysis was employed to predict the probability of corrosion initiation from 2000 to 2100, considering several IPCC future atmospheric CO2 emission scenarios. Results show:(1)carbonation depth in A1F1 and A1B scenarios is 36% higher than that invariant CO2 concentration, and A1B scenarios is 21%; (2)The corrosion initiation probability of RC structures in A1F1 and A1B scenarios are 84% and 67% higher than that invariant CO2 concentration , respectively.
Topology Optimization Design on Vibration and Noise of Circular Saw Blades
Authors: Yao Tao , Duan Guo Lin , Yin Xiao Li
Published: April 2012

Slotting is a good way to reduce the vibration and noise of circular saw blade. Optimization of slotting structure for low noise circular saw blades has become important in the recent designs. Altair_Optistruct provides an optimization toolkit to determine the most efficient load path for various constraints. This paper details the application of optimization techniques to reduce vibration and noise of circular saw blade with slots, the finite element model under the load conditions have been established in Hypermesh software, the vibration of peak ground displacement of modal for frequency response can be optimized to obtain maximum reduction, volume fraction range between 0.1 and 0.3 as constrained condition. The approach results have been successfully realized, and the optimization of slotting placement has been obtained.
Optimal Design of a Vehicular Charged-Air Cooler Based on Numerical Simulation of Thermal-Hydraulic Performances
Authors: Xiao Bao Lan , Wu Wei Ming , Lu Qian Qian , Yu Xiao Li , Lu Guo Dong
Published: April 2012

A charged air cooler (CAC) with good thermal-hydraulic performances is the guarantee for vehicular turbo charged air system. Mullti-porus media model is adopted in this study to investigate the thermal-hydraulic performance of a CAC and the effect of its structure on the performance. The detailed fin structure can be simplified and thus computational workload can be reduced greatly by this way, and the overall thermal-hydraulic performance investigation of a CAC is possible. The study results show that the inlet and outlet locations of hot-channel have a significant effect on thermal-hydraulic performance and through changing the locations, heat transfer can be enhanced and flow resistance can be reduced.
Role of Ion Transport in the Actuation of Cellulose Based EAPap
Authors: Zhao Li Jie
Published: April 2012

The application of electroative polymer devices requires the availability of their propertis at various operating conditions. Cellulose based Electro-Active Paper (EAPap) has been studied as an attractive EAP material for artificial muscles due to its low cost, availability, light weight, large displacement output, low actuation voltage and low power consumption. It is investigated which the underlying mechanism is responsible for their strain-field response. The understanding of the actuation mechanism of this material is important in order to improve the performance and also to better target the application. To physically investigate the actuation mechanism of EAPap, several tests are performed. TSC current showed an evidence of ionic migration effect. Thus, we conclude ionic migration effect associated with dipole moment of cellulose paper ingredients. These effects maybe depend on environmental condition.
Multi-Jack Single-Drive Semi-Flexible Nozzle Mechanism Design and Simulation
Authors: Yu Cheng Guo , Chen Zhen Hua , Nie Xu Tao
Published: April 2012

In order to reduce the cost of wind tunnel construction, simplify the requirement of control, and increase the security in the operation of nozzle, the multi-jack single-drive semi-flexible nozzle is designed. Based on the planar linkage design theory, the movement of multi-jack semi-flexible nozzle with single drive organ was achieved by using the software of MATLAB. Furthermore, the rigid-flexible coupling kinematics simulation of multi-jack single-drive semi-flexible nozzle is done to testify the rationality of the mechanism design by using the software of ADAMS and PATRAN/NASTRAN. The comparisons of four Mach numbers show that the simulation surfaces have good agreements with the aerodynamics surfaces.
Influence of Injection Velocity on Morphology and Fraction of Solid Phase During Thixomolding Process
Authors: Cui Xiao Peng , Xu Hai Ying , Liu Hai Feng , Zhang Tao , Liu Yong Bing
Published: April 2012

During Thixomolding process, solid phase fraction decreased with the injection velocity increasing. Meanwhile, the solid phase morphology changed from irregular dendrite to near spherical. Friction heat produced by high speed melt flow could cause partial melt of solid phase, and the morphology of solid phase would form into globular. The dendritic solid phase can be broken by high speed melt flow under the condition of injection velocity higher than 2.0m/s.
Force Model and Simulation Analysis about Two-Ring Speed Reducer
Authors: Li Ling Fang , He Zhe Ming , Luo You Xin
Published: April 2012

After expounding the characteristic and the weakness of three-ring speed reducer, this paper pointed out the principle of two-ring speed reducer. In two-ring speed reducer, the planetary gear with inner teeth is supported by three shafts, and rotary centers of three eccentric shafts are made to form an equilateral triangle in a plane. At any time, meshing points of two internal gear pairs in two-ring speed reducer are always located at two symmetric points of the output rotation centers, which makes the manufacturing and assembly of two-ring speed reducer are more simple and convenient than three-ring one. Then, the force model of two-ring speed reducer was established, and the simulation analysis was done in Matlab. The result in the simulation coincides with in the finite element method, which testifies the formula deduced in this paper is correct.
The Research on Calculation Method of Pump Efficiency
Authors: Li Qiang , Yin Xu Dong
Published: April 2012

Pump efficiency as an important parameter in the modern production of oil field. How to get the actual pump efficiency accurately and quickly is very important. In order to obtain accurate pump efficiency, the ground dynamometer card of the oil well is taken as the research object. According to find the traveling valve factual open and close position, we can get the actual efficient stroke and the load change of sucker rod. Then pump efficiency is computed using the actual efficient stroke and the load change of sucker rod.
Shock Mechanics Model and Characteristic Analysis of Polyurethane Isolator with Displacement Restrictor
Authors: Lv Zhi Qiang , Shu Li Hong
Published: April 2012

Vibration isolator with displacement restrictor is used to best control vibration and shock simultaneously. This can’t be realized without a proper mechanics model. The drop weight test on the polyurethane isolator with displacement restrictor was discussed. The generalized mechanics model of vibration isolator based on the MAXWELL element and gap element was established, which can help the shock characteristics analysis and parameter optimization of the isolator.
Antibacterial Functional Fabrics Development and Research on its Performance
Authors: Liu Yan Jun , Liu Peng , Hou Ai Qun
Published: April 2012

According to the characteristics of functional fibers and the performance requirements of underwear product, we selected chitin ,cotton and wool fiber as raw material, and developed two different structural underwear fabrics, Based on the experimental test, the wearability hydroscopicity, vapor permeability and anti-bacterial property were analysed and studied. The results showed that the designed fabrics have excellent hydroscopicity, vapor permeability and anti-bacterial function. as well as excellent wearability. Therefore, the underwears made of these fabrics willl not only be comfortable to wear , but also have excellent health care function. Therefore, they are ideal fabrics for making high–quality underwears
Application of Pro/E in the Design of the Controllable Start Planet Gear Reducer
Authors: Li Long , Zhang Chun
Published: April 2012

The application of Pro/E in three-dimensional parametric modeling in the controllable star[planet gear reducer,and the application of Relations,program of Pro/E in parametric design of the gear were introduced.The components assembly design was described.The basal essential in parameterized modeling with Pro/E was introduced.
Treatment Methods for Over Reinforcement of Coupling Beam in High-Rise Building Structure Design
Authors: Zhu Xu Ping , Wen Li Ping , Li Ju Wen
Published: April 2012

This paper analyzes the over-reinforcement of coupling beam in high-rise building structure design and proposes the relevant treatment methods and suggestions to provide references for designers. Coupling beam is a beam that is used to connect between wall limbs or wall limbs and frame columns in shear wall structures and frame – shear wall structures. A coupling beam generally has the features of small span, large cross section and high stiffness of the wall connected to it.
Simulation of Metal/Oxide Interface Mobility: Effects of Mechanical Stresses on Geometrical Singularities
Authors: Optasanu Virgil , Raceanu Laura , Montesin Tony
Published: April 2012

During the last decade, an increasing importance has been given to the feedback of mechanical stresses on the chemical diffusion and, further, on corrosion. Many works point the active role of stresses on the material ageing especially on their negative consequences leading to the damaging of structures. Based on a theoretical study and using numerical tools and experimental results our previous works [1, on stress/diffusion coupling, highlight the strong influence of stress field on the diffusion process. The aim of the present paper is to describe the influence of some particular morphologies of the metal/oxide interface on both diffusion and oxidation process. The oxidation is assumed to be driven by a mass conservation law (Stefan's law) while the diffusion coefficient of oxygen in metal is locally influenced by the stress field. The stability of a waved-shape interface is studied in both cases: simple diffusion and coupled stress/diffusion process. In this purpose we have developed an original numerical model using a virtual metal/oxide interface of a mono-material with oxygen concentration-dependent parameters, which allows to operate easily with any shape of interface and to use simple finite element meshes. Furthermore, in order to underline in a more obvious way the consequences of mechanical stress on the diffusion process, a particular geometry is studied.
Modeling of Fractional Diffusion on a Catalytic Particle under Different Flow Conditions
Authors: Carella Alfredo Raúl , Dorao Carlos Alberto
Published: April 2012

Coupling diffusion and convection of species is relevant for optimization of diverse engineering processes, especially when chemical reactions are involved. In particular, the problem of predicting the flow of species into a particle is of large importance in the design of catalytic particles. A numerical framework using the Least Squares Spectral Element Method is implemented in order to analyze the species transport from a flow into a particle by a fractional constitutive law. The aim of this work is to investigate the qualitative change in the concentration profiles in the transition from Fickian to fractional anomalous transport inside the particle. A sample case is provided corresponding to a flow between two parallel plates and around a cylinder, coupled with species transport into the cylinder.
Determination of Grain Boundary Diffusion Parameters Based on Combined Analysis of Radiotracer Technique and Mössbauer Spectroscopy Data
Authors: Popov Vladimir V.
Published: April 2012

A method of grain boundary diffusion characterization has been suggested based on combined analysis of radiotracer serial-sectioning technique and Mössbauer spectroscopy data and a specified model of grain boundary diffusion. Its application for determination of parameters of Co grain boundary diffusion in W is demonstrated.
About Fe Diffusion in Cu
Authors: Prokoshkina D. , Rodin Alexey , Esin V.
Published: April 2012

The temperature dependence of the bulk diffusion coefficient of Fe in Cu is determined by EDX in the temperature range from 923 to 1273 K, , m2/s. These results are different from that obtained earlier by radiotracer technique: activation energy is less by 30 kJ/mol and pre-exponential factor is 50 times smaller. Deviations from ideality of investigated solutions do not explain the differences; consequently, the thermodynamical factor would not responsible for such an effect. Fast grain boundary diffusion of Fe in Cu was not observed in the temperature range from 823 to 1073 K.