bluuebunny/crossref_metadata_2025 huggingface dataset:
Mechanical, Metallurgical Characteristics and Corrosion Properties of Equal Channel Angular Pressing of Duplex Stainless Steel
Authors: Ajith P.M. , Sathiya P. , Gudimetla Kondaiah , Ravishankar B.
Published: July 2013

Duplex Stainless Steel (DSS) is well known for their higher mechanical strength and better corrosion resistance. DSS is commonly used for marine construction, petrochemical and chemical industries. DSS (2205) is having equal amount of α and γ phases.The present study was conducted on12mm diameter rod of the UNS S32205 duplex stainless steel subjected to equal channel angular pressing (ECAP). The refinement of original grains was observed. Effect of microstructure change on the corrosion behavior of equal channel angular pressed (ECAP) UNS S32205 duplex stainless steel was investigated. After single pass ECAP process and study about the pitting corrosion resistance. The mechanical properties of UNS S3 2205 duplex stainless steelwere evaluated. The amount of ferrite after ECAP and before ECAP for the two different conditions was investigated. Also observed percentage of ferrite content reduces 3.32% after ECAP.
Research on the Evaluation Index System of ERP Implementation Performance Based on the Fuzzy Algorithm
Authors: Lv Hong , Dong Ling Ling
Published: July 2013

Based on the BSC (balanced score card) and its expansion theory, this paper regards the fuzzy algorithm as the means and the empirical research of sampling of the large and medium-size enterprises as the basis, then combines the characteristics of the enterprise sectors and activities to build a set of evaluation index system of ERP implementation performance, which is objective, valid and integral. This aims to improve the success rate to implement ERP for enterprises and promote their business processes as well as the performance.
Application of Water Poverty Index in the Reclamation Regional Water Security Evaluation
Authors: Jiang Ning , Yu Xue Feng , Chu Li Li
Published: July 2013

Aiming at the water security problem, the Reclamation area was took example to analysis. The WPI of every three years during 2000-2009 of Reclamation area is calculated by using weighted average method. The results show that WPI appears in an increasing trend during past 10 years in Reclamation area. If the following aspects can be improved in the future including controlling the pesticide and fertilizer, reducing water loss and soil erosion, increasing forest coverage, irrigation efficiency and investment in hydraulic construction, the utilization rate of water resources will be further improved.
Analysis on Modifying Asphalt by Rubber Powder
Authors: Bian Hui Guang , Wu Yu Jian , Wang Chuan Sheng
Published: July 2013

This article by groups of comparison, analyzes the impact of he content, the mesh size and the kinds of Rubber Powder to Modified asphalt properties. Experiments concluded that, the content of rubber powder has the most impact to rubber powder modifying asphalt properties, and when the content in 10%～20% has a optimal value; the mesh size is not the thinner the better; ordinary rubber powder has a high performance-price ratio.
Study on Transient Heat Transfer of Micro-Injection Molded Structures Based on the Finite Element Method
Authors: Wang Xiao Hua , Xie Peng Cheng , Zhang Pan Pan , Zhang You Chen , Yang Wei Min
Published: July 2013

Injection molded part with micro structures is extensively used as a heatsink, which will provide bright prospects for application. In this present study, analytical models with micro pins, micro holes and micro grooves were specially designed and built. Molding quality and transient heat transfer performance of these parts were investigated via the finite element methods. As research objective, warpage and residual thermal stress of each target under identical molding conditions was compared to evaluate the product quality, and heat dissipation performance of micro structures was applied to assess the applicability of plastic products used as heatsinks. Study results revealed that the part with micro grooves had better molding quality and heat dissipation effectiveness than others.
Research on the Elasticity Modulus of Short Glass Fiber / Thermoplastic Polyurethane (SGF-TPU) Composites
Authors: He Jian Yun , Ding Yu Mei , Xue Zi Chen , Yang Wei Min
Published: July 2013

Based on fiber length, fiber orientation distribution and fraction volume, the Halpin-Tsai’ elasticity modulus prediction equation were modified and the elasticity modulus of SGF/TPU composites was experimentally studied. The relationship between the structure and elasticity modulus of SGF/TPU composites was discussed. Results showed that the elasticity modulus of GF-TPU composite rapidly increased as the increasing of fiber volume fraction () and the increasing of the fiber length at the range of 0%-20%. The modified prediction equation of the elasticity modulus fits the test result quite well.
Finite-Element Analysis of Rotor in the Rubber Continuous Plasticator
Authors: Fu Ping , Zhang Hong Lei , Wang Chuan Sheng
Published: July 2013

The three-dimensional flow fields produced by the modular dual-rotor of rubber continuous plasticator were numerically simulated and analyzed by using ADINA, the FEM simulation software. So the velocity field distribution of each rotor element was shown by the simulations. Through the analysis, the double rotors rotated inward had high efficiency of pumping and plasticization. The rubber compound was subjected to the strong shearing action; squeezing action and stretch effect in the rubber plasticate process. The simulation calculation had great significance for the rotor optimizing design.
Effects of Different Process Parameters on Rubber Mixing in Tandem Internal Mixer
Authors: Wang Chuan Sheng , Zhang Meng
Published: July 2013

This article is based on cooling water temperature, mixing time and rotor speed of downstream mixer to study effects of different process parameters on rubber mixing in tandem internal mixer. The experimental results show that the cooling water temperature has an important significance to improve the mixing quality, and the best cooling water temperature is about 30°C. Mixing time must be strictly controlled and the best range of mixing time is about 80 ~ 90s. Rotor speed has an significant effect on the physical properties of rubber, and the best rotor speed is about 30r/min. There is an optimal fill factor, and the best fill factor is 0.35.
Melt Behavior Simulation on the Planetary Gear Pump Used for Polymer Differential Injection Molding (DIM)
Authors: Zhang Pan Pan , Xie Peng Cheng , Miao Li Lei , Wang Xiao Hua , Yang Wei Min
Published: July 2013

A planetary gear pump (PGP) was introduced to the differential injection molding. The system is matched with a vertical injection molding machine (IMM). The PGP is integrated in the stationary mold and is fixed between the stationary platen and the movable mold of IMM. The dynamic mesh technology in the software packages Fluent was applied to investigate the melt behavior. Characteristics of the PGP, such as pressure and injection volume, used for the DIM process were studied
Optimization of Staggered Tooth of Sleeper Molds Based on FEM
Authors: Wang Jia , Gong Yu Guang , Liu Dong Sheng , Lv Bai Yuan
Published: July 2013

This paper, through optimization of staggered tooth of sleeper molds based on FEM, obtains the structure of staggered tooth better than the original one. And in the condition of meeting the requirements of material strength ,stiffness and safety, it saves about 12.52 percent of steel.
The Performance Analysis and Research about a Type of New Tubular Belt
Authors: Zhang Wei Feng , Wang Chuan Sheng , Zhang Fu Xia
Published: July 2013

Abstract. The tubular belt conveyor system is one of the most widely-used deferent manners in bulk material. It is a relatively important continuous deferent manners in modern intensive production, widely applied in metallurgy, coal, building materials and other different industries. The belt conveyor has advantages in long distance convey, large conveying volume, high efficiency, with simple structure. Now with the development of the machinery manufacturing technology, rubber industry and the requirements of the environmental aspects, the new type tubular belt type conveyor has obtained unanimous approval, and possessed vast vista in application and use value
New Rotors Configurations in the Rubber Continuous Mixer
Authors: Wang Chuan Sheng , Zhang Hong Lei
Published: July 2013

The modular dual-rotor was designed for the Rubber continuous mixer in this paper. It was composed of various components with different configurations, such as meshing components, shear components, large screw lead components and tooth components,etc. The type and location of structural components can be changed according to the mixing performance. A lot of rubber continuous mixing experiments had been done using the formula of tread compound and three rotor configurations in the rubber continuous mixer. The best of the rotor structure and combination had been found by the comparison analysis of experimental results.
The Numerical Simulation of Injection Coated Sleeper
Authors: Zong Zhi Wen , Liu Dong Sheng , Wang Jia , Lv Bai Yuan
Published: July 2013

Using Moldflow software, numerical studies of the Three-dimensional velocity vector distribution of molten fluid in the process of filling the inside mold cavity in one-step[1] injection mold filling method, analysis of the melt flow front temperature in mold cavity, cavity pressure and die time under the conditions of different injection pressure. The results of the simulation have some theoretical significance on the designing mold and choice of injection process.
Dynamic Simulation and Analysis of Different Phase Synchronous Rotor Mixing Process
Authors: Mu Xue Jie , Li Xing Wei , Duan Na
Published: July 2013

Contrast and analysis of the influence that synchronous rotor mixer’s two phase angles 90° and 180° to the mixing effect using special visco-elasticity fluid software--Polyflow. The results show that 90° phase angle rotor could promote compound mixing, and improve mixing rubber’s uniformity, and its mixing effect is better than synchronous rotor with 180° phase angle.
The Research on the Heating Time of Rotational Molding
Authors: Qin Liu , Ding Yu Mei , Jiao Zhi Wei , Liu Yue Xing , Yang Wei Min
Published: July 2013

In the process of rotational molding, there are two important parameters, temperatures in the rotational molding machine’s oven and in the mold. It is the crux of the evaluation about the molding efficiency and products’ quality to control the time of the temperatures to reach the top. This article puts forward to two time parameters C1, C2 to show temperatures’ change in machine’s oven and in the mold during the molding processing. Besides, these two time parameters are applied to direct the structure design of rotational molding machines and molds. Meanwhile, the theoretical analysis agrees well with the experimental data from the comparison between them. Hence, the efficacy and practicality of the two parameters are well verified.
EDM Surface Strengthening Research on Rubber Mold
Authors: Liu Jie , Liu Zuo Jing , Zhang Ming
Published: July 2013

Spark deposition technology is a kind of important means on rubber mold surface strengthening and repair .The temperature field for 2A12 Aluminum Alloy during EDM surface strengthening is simulated and analyzed through establishing proper finite element model based on finite element software. The results show that: During the strengthening, temperature field is mainly concentrated on the surface of work-piece and has little influence on the internal of work-piece. The temperature field of the surface of work-piece has the dynamic effects, which moves with the movement of the strengthening point and becomes stable as time passes. During the strengthening, the temperature for nodes on the surface decreases slowly after rising rapidly, and the strengthening point has the highest temperature. The barrier of the insulated boundary has a great influence on the distribution of temperature.
The Simulation of Rolling Lamination Forming for a Light Conveyor Base on ANSYS/LS-DYNA
Authors: He Jian Yun , Ding Yu Mei , Xue Zi Chen , Yang Feng , Yu Hai Long , Yang Wei Min
Published: July 2013

Rolling lamination forming of polyvinylchloride light conveyor was simulated using ANSYS12.0/LS-DYNA of FEM software. The filling condition of materials, the change of products’ geometry and the plastic deformation of products during the rolling forming process were studied. And the deforming displacement curves of the product in X direction during the process were also explored and discussed deeply. A simulation method of rolling lamination forming process was established and good results were achieved, which made a contribution to the theory of rolling lamination forming and is meaningful to the mould optimization, process parameters design and product quality control.
Simulation Study for the Effect of Oil Viscosityon Performance of Full Metal Single Screw Pump
Authors: Wu Jun Fei , Wei Xiao , Yang Xue Zheng , Yu Ying
Published: July 2013

Abstract: The oil viscosity affects the pump filling coefficient, so it is the important parameter affecting lifting performance of metal screw pump. Firstly using the finite volume method to establish a full-metal single screw pump 3D model, secondly using FLUENT software to calculate outlet pressure changes with different series of oil viscosity in condition of the same inlet pressure.Lastly Drawing outlet pressure change curves to evaluate the concrete effect of oil viscosity on the performance of the pump . The results indicate that the oil viscosity affects liquid filling coefficient of pump. As the viscosity increases, the outlet pressure of the pump increases, the leakage of the pump output decreases, thereby lifting capacity and volumetric efficiency of the pump improve.
Application of Numerical Simulation in Optimizing Rubber Injection Molding Process
Authors: Zhang Hui Min , Niu Jia Teng , Dong Lei Lei
Published: July 2013

The rubber melt flow processes was studied through the numerical simulation methods. According to the two important factors of the melt temperature and mold temperature, the paper designs three plans, analyzed rubber melt flow front temperature, volume curing rate and volume curing rate at the end of filling in different melt temperature and mold temperature and found the best solution, so that curing time was shorten and production efficiency was improved under the precondition of filling smoothly mold and ensuring quality of products.
Research on Fill Factor of Internal Mixers
Authors: Yang Fu Qin , Song Guan Ying , Wang Chuan Sheng
Published: July 2013

With the same recipe and technological conditions, experimental research on fill factor about rubber compound of all-steel radial tire was conducted in four types of X(S)M-1.7L mixers: intermeshing rotor mixer, variable intermeshing clearance mixer, shearing rotor mixer and variable shearing clearance mixer. Based on the summary and analysis of experiments, the authors discussed the influence of fill factor on performance of internal mixers and physical and mechanical properties of the rubber compound. And the optimal values of fill factor of different types mixer were determined.
Proper Index of Foam Statics Characteristics on Predicting Foam Dynamics Behavior in Porous Media
Authors: Li Ying Ge , Geng Dian Cai , Zhang Fa Hu , Du Dong Xing
Published: July 2013

Proper foam statics index can give essential indications on foam dynamic behavior in porous media. In this paper, the statics characteristics are investigated through air-flow method for foam generated with Sodium Dodecyl Sulfate (SDS) surfactant. Parameters of foam height, foam half period time are recorded for various gas phases, surfactant concentrations and injecting gas flow rate, and foam morphology are also visually monitored. It is found the N2 generated foam has better characteristics on foam height, while poorer characteristics on foam half-time period compared to air and CO2 foam. Widely employed Foam Composite Index (FCI) is no longer suitable for predicting foam dynamic behavior, a Foam Index for predicting Dynamic Behavior in Porous Media (FIDBPM) is therefore defined to predict properly the foam transient propagation process in porous media.
Analysis of the Ring Die of Biomass Energy Molding Machine Based on ANSYS
Authors: Liu Bing Cheng , Shang Yao Xian , Xu Yuan Min , Liang Xiao Ming
Published: July 2013

In this paper, we analyze the abrasion wear of the ring die in the theoretical way. Firstly, we obtain the abrasion wear belonging to three-dimensional abrasion wear and soft material wear , then realize three-d modeling of the ring die with the aid of Pro/Engineering. Lastly, we conduct numerical simulation by using finite element analysis software ANSYS, and we draw a conclusion that die cone angle and radian are the important elements to the life of the ring die.
Numerical Research of Thermal-Pressure Coupling Effect on Blockage Ratio in the Evacuated Tude Transportation System
Authors: Li Qing Ling , Jia Wen Guang , Dong Chen Guang , Duan Rui Xiang
Published: July 2013

According to the three-dimensional mathematical model and physical model of evacuated tube transportation(ETT) system, thermal-pressure coupling equations based on viscous fluid Navier-Stokes equation and k- ε turbulence model are established for the first time. The numerical simulation is carried out to investigate the inherent laws for different blockage ratios of ETT system. The simulation results show that: when the speed of the train and the pressure of the system are constants, in the temperature field, the aerodynamic heating is getting more as the blockage ratio increases, and its trend grows exponential. In the pressure field, with the increase of the blockage ratio, the stagnation pressure is gradually increased, but the growth is getting slower; vortex region pressure reduces gradually, and has accelerated the decreasing trend; the pressure difference between the head and the end of the train is linear increment.
Numerical Study of Circular Tube inserted Arc Belt on Fluid Flow and Heat Transfer under Laminar Flow
Authors: Zhang Dong Hui , Gao Jiao
Published: July 2013

The objective of this paper is to study the characteristic of a circular tube with a built-in arc belt on fluid flow and heat transfer in uniform wall temperature flows. Numerical simulations for hydrodynamically laminar flow was direct ran at Re between 600 and 1800. Preliminary results on velocity and temperature statistics for uniform wall temperature show that, arc belt can swirl the pipe fluid, so that the fluid at the center of the tube and the fluid of the boundary layer of the wall can mix fully, and plays the role of enhanced heat transfer, but also significantly increases the resistance of the fluid and makes the resistance coefficient of the enhanced tube greater than smooth tube. The combination property PEC is all above 1.5.
Project Management’s Changes Based on PDM in the Model Solution
Authors: Cai Han Ming , Liu Cheng Kun
Published: July 2013

This article describes a new project PDM change program to solve certain aspects of reinvent the wheel phenomenon caused irreversible in the past, and change the node at strengthening the audit efforts. This formed a set of strict and efficient management processes, that make the PDM’s applications more standardized, humane and reasonable.
Experimental Study on Ice Melting with Different Temperatures and Specific Areas
Authors: Wang Yong Yan , Qin Nan , Yan Xin , Niu Tian Tian
Published: July 2013

The incremental digital PID technology and pressure regulating technology are adopted for this thermostat. The results show that it can be better stabilize the temperature and can control the residuals between ±1 degrees Celsius. The experiment in transformation between solid and liquid of ice is designed on this basis. By changing the temperature and specific area, the law about melting time and rate between temperature and specific area is discussed and the proper empirical equations are obtained by using the MATLAB. Finally the result is that temperature and specific area can influence the process with power function relationship.
Analysis of Thermal Field of Gear Driving with Meshed Medium Belt
Authors: Fan Zhi Min , Gao Liang , Li Hui Min , Liu Ru Cheng
Published: July 2013

Solid models of the involute gear, the gear with meshed medium belt and the medium belt were built with the PROE software. Then the steady-sate temperature field of the solid model was analyzed with ANSYS software. The result showed that the body temperature distribution on the tooth face was not effected by the medium belt. Different duty parameters were selected to analyze the highest temperature of the medium belt. So theory basis for choose of the medium belt and the duty parameters was provided.
Structural Modification and Airflow Optimization of Bag-Type Collector Based on Flue-Gas Rich-Lean Separation
Authors: Li Rong , Zhang Bing Zhen , Zhang Bin
Published: July 2013

With the computational fluid dynamics software FLUENT, three dimensional gas-solid two-phase flow field was simulated and analyzed for HMC-64 pulse-jet cleaned bag-type collector. The simulation data and the actual operating parameters were compared, and the airflow distribution of bag-type collector was comprehensively learned. On the basis of the original analysis, the reconstruction about flue-gas rich-lean separation combining lateral extension at the entrance of bag filter was put forward. The velocity distribution and the mass flow rate of all filter bags were compared. Results showed that through using rich-lean separation combining lateral extension, the airflow distribution of each filter bag was optimized. The integrated flow non-uniform amplitude and the relative root-mean-square value became lower than those of original model. These conclusions about the structural modification and the airflow optimization provide theoretical foundation for further research.
Mechanical Characteristics Analysis of Steel Bracing Structure of Porous Fences
Authors: Jiao Yu , Huang Wen Bo , Duan Zhen Ya
Published: July 2013

In this paper, the vertical-parallel type steel bracing structure of the porous fences is taken as research object, which is applied in the dust control package engineering devices in some power plant in Hebei Province. After two-dimensional finite element model of steel bracing structure was established by ANSYS, the mechanical characteristics with wind loading have been analyzed. Furthermore the strength, stiffness and stability have been checked. The research results will provide helpful theoretical support to optimize the structure and reduce the investment cost of the porous fences engineering.
Design and Preparation of Al2O3/TiC/CaF2 Self-Lubricating Ceramic Tool
Authors: Cao Tong Kun , Shan Chun Sheng , Ge Jun Peng
Published: July 2013

For friction design, the antifriction model of self-lubricating tool was built. Al2O3/TiC/CaF2was prepared, and the chemical compatibility of Al2O3/TiC/CaF2was analyzed and calculated and the results were verified by X-ray diffraction patterns. The microstructure design of self-lubricating tool material was discussed. The results show that it can reduce the friction coefficient if solid lubricating film can be produced on the friction interface, even the lubricating film can't completely be formed on the friction interface. Under high temperature, there were no reactions in Al2O3/TiC/CaF2. To form continuous net structure of matrix and reduce the friction, the solid lubricants content should be moderate. According to analysis of the particle packing ways, the radius ratio between solid lubricant particles and ceramic matrix particles was confirmed and it should be within the scope of 0.225 r / R 0.414.
Performance Study of Solar Chimney Power Plant System with a Sloped Collector
Authors: Li Qing Ling , Fan Xi Yan , Xin Xuan , Chao Jun , Zhou Yan
Published: July 2013

There is a solar chimney power plant system supported by southern sloped mountain for high latitudes. The sloped collector is built at suitable mountain hills, which also functions as a chimney. Then a short vertical chimney is added to install the vertical axis air turbine. Deduce and analysis the power and efficiency of the system. The result indicates that for northern latitude area near 35 degrees, the power and efficiency of the solar chimney power plant system with a appropriate sloped angle collector are higher than the solar chimney power plant system with a horizontal collector, besides, the system scale is bigger, the gap is more larger. Furthermore, the system can appropriately reduce the height of vertical chimney and construction problems.
The Comparison of CFD Flow Field between Slope Solar Energy Power Plant and Traditional Solar Chimney Power Generating Equipment
Authors: Li Qing Ling , Xie Xiao Qing , Chao Jun , Xin Xuan , Zhou Yan
Published: July 2013

A numerical study with FLUENT software has been carried out as to air performance in the slope solar energy power plant. The velocity field, temperature and pressure fields in the solar chimney, and the simulated result were compared with the simulated result of traditional solar chimney power generating equipment. The simulation results show that distribution of the temperature field and the velocity field in slope solar energy power plant and traditional solar chimney power generating equipment. In the case of the same height, the velocity of traditional is slightly larger than the slope style's, but there is little difference. In order to achieve the same power generation effect, the overall height of slope style is more than the traditional style, but the vertical chimney height of traditional style is greater than the slope style. The cost of construction of vertical chimney is expensive, and many problems have been considered, like radix saposhnikoviae and earthquake prevention, the heat collector also need to be cleaned on time. The slope style can take full advantage of land, the height of vertical chimney will be reduced, so the construction of the chimney will be relatively easy. Rainwater can clean the heat collector when it runs down from it. All things considered. The slope solar energy power plant has more development prospects.
Test Research for Thermal Protective Properties of Mobile Refuge Chamber
Authors: Chang De Gong , Du Min Min , Gao Xin Jun
Published: July 2013

In this paper we have a discussion on heat insulation method of the using of mobile refuge chamber for coal mine and the improved scheme was put forward to improve the performance of thermal protective properties of the refuge chamber. Then according to the theoretical analysis and the external heating test methods to be compared,we conduct an analysis.The test method are introduced, and the factors caused the temperature changes are analyzed based on the test.These results have directive significance for the further improvement of refuge chambers.
The Tank Bottom Safety Detection Based on Acoustic Emission Technology
Authors: Huang Yi Hu , Ma Ji Xiang , Li Zhong Hong , Zhang Yin Ping , Han Xiao Dong
Published: July 2013

We conduct acoustic emission online detection on the bottom of atmospheric tank based on the principle of acoustic emission testing. Based the actual situation, the result of ultrasonic thickness opening inspection of tank bottom and the results of acoustic emission measured data are compared and analyzed to verify the feasibility and reliability of acoustic emission detection method.
Numerical Simulation Research of Precision Injection Molding Control Method Based on P-V-T Properties of Polymers
Authors: Xie Peng Cheng , Guo Xiao Long , Gou Gang , Ding Yu Mei , Zhang You Chen , Yang Wei Min
Published: July 2013

Nowadays, with the rapid development of aerospace, auto, communication, consumer electronics and other fields, precision injection molding has been widespread concerned. P-V-T (Pressure-Specific-volume-Temperature) properties are inherent characteristics of polymers. In this paper, P-T parameters were set up in packing stage to achieve constant specific-volume control. Numerical simulation of P-V-T control strategy with Moldflow was carried out. Compared with conventional control strategy, the results showed that P-V-T control of precision injection molding could bring out more uniform density distribution, reduction in volume shrinkage and warpage of molded parts. It was concluded that the P-V-T control method could effectively improve the molding quality of the plastic product.
Study of the Mathematical Model for Online Predicting Dispersion on the Rubber Open Mill
Authors: Zeng Xian Kui , Zhao Shu Hong , Ren Na , Wang Dong , Yang Chang He
Published: July 2013

Using the intelligent open mill mixing experimental platform, in the light of the all-steel radial tire tread formula, according to the experimental results and using regression analysis method and analysis software, we completed the establishment of the dispersion mathematical model about the open mill rubber. And through the inspection and verification of the model, we know that the multiple correlation coefficient of the model was 0.773 and the level of significance of the t-statistic and F-statistic are less than 0.01, also the absolute error between the predicted value of this model and the measured value is less than 0.7. It shows that the model is quite significant and can be applied.
Novel Fiber-Optic Sensing System for Detection of Methane
Authors: Wang Shu Tao , Zhang Peng Wei , Zhu Quan Min
Published: July 2013

Based on DFBLD (Distributed Feedback Laser Diode) and harmonic detection technique, a novel fiber-optic methane detection system is constructed. The system can be applied to broad-range concentration detection of methane. Based on the approximation express of the law of Beer-Lambert, detection of methane with various concentration from 0% to 20% is completed using subtraction of background and ratio processing method, as the atmosphere surroundings are treated as background noise. The direct absorption spectra for various concentration is measured using GRIN gas cell, combined with DFBLD. The R5 line of the 2v3 band of methane is selected as the absorption peak. The system is tested online during gas mixing process and the linear relationship between system indication and concentration variation is validated. Also the stability and dynamic response characteristics are confirmed by the experiments. The sensitivity of the system can be adjusted according to the concentration level of various field environments by changing the prism distance using step motor. In the range of 0% to 20% the sensitivity of methane detection can arrive at 0.001%. So the system can be applied to various application fields and adopted as monitoring instruments for coalmine tunnel and natural pipeline.
Photoacoustic Resonant Cell Remodified from Helmholtz Cavity for Multi-Gas Sensing Using Infrared Lasers
Authors: Zhao Jun Juan , Li Xian Hui , Zhao Zhan , Gai Xiao Ling , Liu Yan Qi
Published: July 2013

This paper presents method and performance of the photoacoustic resonant cell remodified from Helmholtz cavity that can be used to detect photoacoustic signal of multi-gas. This technique has its physical basis in a phenomenon called the photoacoustic effect. The experiment system is composed of a resonant Helmholtz cavity, a sensitive microphone and two infrared lasers with high adsorption capability and specificity to the analyte. In our experiments, the average optical power at the laser operating point is 200mW for the 972nm laser (H2O detection) and 800mW for the10.653um laser (CO2detection), which are modulated at two different frequencies f1=175Hz and f2=125Hz. The remodified Helmholtz resonant on-line and real time measurement of the water vapour (300ppm) and carbodioxide (300ppm) conducted at their respective resonant frequency shown large signals about 4.41mV and 19.77mV respectively. The result demonstrated this cell used to test multi-gas is also feasible.
Three-Dimensional Analysis of Divergence Aangle on Deposition of Chromium Atoms in Laser Standing Wave Field
Authors: Huang Jing , Zhu Bao Hu , Zhang Wen Tao
Published: July 2013

Three-dimensional analysis of the effects of atom beam divergence angle on the process of fabricating nanograting is discussed based on the three-dimensional motion model of Cr atoms in Gaussian standing wave laser field. From the simulative results it can be seen that Atomic beam spreading plays an important role in determining the deposition nanometer quality, so the preparation of a high-collimated and transversely cooled atomic beam, typically under 0.6mrad, is essential to minimize the severely disadvantageous effects for deposition of atoms in laser standing wave
TiO2 Thin Layer Coated Ag Nanoarrays Complex for Surface-Enhanced Raman Scattering Substrate
Authors: Bao Zhi Yong , Wu Yu Cheng
Published: July 2013

A novel method to prepare TiO2-coated Ag nanowire arrays for use as surface enhanced Raman scattering (SERS) active substrate is studied. First, Ag nanowires with an average diameter of 60 nm and length of several μm were synthesized in an anodic aluminum oxide (AAO) template by direct electrodeposition into the template. Then TiO2thin layers with a 20 nm thickness were coated on Ag nanoarrays in large scale by a hydrolysis approach of tetrabutyl titanate. The SERS substrates prepared by this strategy have been proved as excellent candidates for the detection of organic pollutants by enhancing the SERS signals of these target species. The detection limit of methyl-parathion (MP) can be reduced to 10-6M.
Numerical Analysis of Molding Process for Roll Imprinting Based on ABAQUS
Authors: Ye Hui Chun , Liu Yang , Shen Lian Guan , Li Mu Jun
Published: July 2013

To optimize the molding parameters investigating based on Finite Element Analysis is done for roll imprinting. The heat curable material PMMA is employed in the simulation, which is considered as an elastic perfectly-plastic material. Three factors are taken as the evaluation criterions, which are pattern transfer rate, maximum width ratio and maximum depth ratio. Several key parameters, such as the pattern size, the distance between mold and surface of PMMA, the duty cycle of the patterns, rotation velocity of the mold and Young’s modulus of the PMMA and pressing force, are analyzed systematically. Simulation show three of them are main influence factors on the imprinting quality, which are the distance between roller and surface of the polymer, the duty cycle of the patterns and the elastic modulus of the polymer. While the influence of pattern size and rotation speed can be ignored. The results indicate that the duty cycle should be greater than 2 and the distance between roller periphery and surface of the polymer should be -30um to ensure the fidelity of the pattern replication. The simulation results are significant for optimizing the parameters in the imprinting process.
First-Principles Calculations on Pure and Y-Doped Anatase TiO2
Authors: Tang Xiong , Yao Lan Fang , Yan Xin Pei , Kang Jun Long
Published: July 2013

Using the First principles calculations, the crystal structure, band gap, total and partial density of states (DOS) of anatase TiO2and anatase TiO2doped with Yttrium were calculated by a plane-wave pseudopotential (PWPP) method based on density functional theory (DFT). The generalized gradient approximation (GGA) based on exchange-correlation energy optimization was employed to calculate them. From the calculation results, the band gap of anatase TiO2and Y3+doped TiO2are about 2.15eV and 0.86eV. The calculated results demonstrated that the mixing of Yttrium (Y) dopants induces states with original titanium 3d and oxygen 2p valence band attributes to the band gap narrowing. This can enhance the photocatalytic activity of anatase TiO2.
Gap Adjustable MEMS Comb Resonator
Authors: Pu Xuan , Li Wei Hua , Zhou Zai Fa , Huang Qin Gan
Published: July 2013

A new structure of gap adjustable MEMS resonator has been proposed, and an analytical model of the gap adjustable structure has been developed. This model is a 2D vibration system. An opposite type MATA was used to push the fixed finger structure to move, as a result, the gap between the fingers changed. Simulation results show that the displacement of the mechanical oscillator increased when the MATA provided a step force, and the vibration amplitude was modulated when the force was in a cyclical form. In order to improve the stability of the structure, the folded beams were changed into clamped beams. An FEA simulation told us that when the gap changed, the vibration amplitude increased.
On the Test Method of Dynamic Characteristics of MEMS Components
Authors: He Guang , Wang Ya Jun , Ma Wen Rui
Published: July 2013

The paper developed a set of small split Hopkinson pressure/tensile bar testing system (SSHPB/SSHTB) to study the dynamic characteristics of the micro-electromechanical system (MEMS) material and components, by which the dynamic characteristics of MEMS nickel material and planar S-form micro-spring were got. The dynamic Youngs modulus of LIGA nickel under the strain rate of 2×103s-1 got by the SSHPB is about 250GPa, which is slightly higher than that under static condition. The deformation peculiarity of the planar S-form micro-spring is also got by the SSHTB, which is uneven due to the spreading of the stress wave in the micro-spring. The result of the paper is valuable for providing feasible directions to the optimization design and manufacture of the MEMS components.
Numerical Study on Thermal Boundary Resistance and Conductive Properties of Cu/Al Interface
Authors: Ling Zhi Yong , Qian Long , Cheng Guang Gui , Zhang Zhong Qiang , Sun Dong Jian
Published: July 2013

In this paper, the thermal boundary resistance and conductive properties of Cu/Al interface are investigated by using first-principles calculations based on density functional theory (DFT) with considering the pressure influence. Based on the atomic model of Cu/Al interface the simulation results show that the lattice parameters for both Cu and Al are sensitive to pressure and density states of Cu/Al interface increase as pressure increases from 0 to 5 GPa. Although Cu and Al have the same atomic structure, the significant differences of the density of phonon states lead to the thermal resistance that exists at the Cu/Al interface. At the Cu/Al interface, Cu and Al atoms can diffuse into each other and form an alloy-like interfacial region. The change of the copper component in the alloy can considerably affect the conductive properties of Cu/Al interface.
Research on the Resonance Properties of E-Type Nano Antenna
Authors: Su Rui , Yuan Zong Heng , Liu Zhi Wei
Published: July 2013

Finite Difference Time Domain method(FDTD) is used to study the resonance properties of E-type nano antenna in this paper. According to the result of numerical simulation,the size and location of ledge part made a great influence on the resonance properties of holistic nano antenna while major rectangle part is invariant.The electronic field distribution, enhancement factor and corresponding resonance frequency of E-type nano antennas with invariant major rectangle part and different ledge parts are calculated through FDTD method,comparing with rectangle nano antenna without ledge part, E-type nano antenna has a great promotiom in electronic field enhancement at about 100 times of the excite electronic field intensity while regular rectangle nano antenna can achieve about 30times only.The resonance frequency is relate to the ledge part ,by changing the size and location of ledge part,resonant frequency can be adjusted between 340Thz and 400Thz,at the meantime, the field enhancement almost unchanged. After a glass substrate is added under the E-type nano antenna with constant size,the electronic field intensification factor improved significantly and the electronic field spread over the area around the ledge part rather than the junction of glass and metal.The horizontal position of ledge part has an effect on holistic resonance properties.When the ledge part located in the middle, the electronic field intensification factor of three ledge parts rised to 240 times at the same time,and distinct double resonance peak appeared.When the ledge part moved to the edge, the electronic field enhancement around the ledge parts on the sides weaken and middle ledge part rised to 350 times,double resonance peak disappeared.
Structure Design and Simulation Analysis of Multiple Micro Piezoelectric Cantilevers
Authors: Jiang An Ran , Gao Shi Qiao , Yao Feng Lin , He Yun Li
Published: July 2013

In order to effectively capture the environment vibration energy, convert it into electricity and supply energy for the microelectronics devices, multiple micro piezoelectric cantilevers are designed. It is composed of more than one piezoelectric cantilever array, which broaden the resonant frequency band of the piezoelectric vibrator, and it can produce resonance or similar to the resonance in a frequency range. Compared to a single piezoelectric cantilever, multiple piezoelectric cantilevers can effectively broaden the resonant frequency and improve the piezoelectric power generation capacity. The simulation results show that the finite element method can provide important theoretical guidance for the structural design of multiple micro piezoelectric cantilevers.
The Influence of Water Contact Angle on the Colonization of Diatoms (Navicula sp and Pinnularia sp) and Ulva Spores (Pertusa)
Authors: Zhang Jin Wei , Lin Cun Guo , Wang Li , Zheng Ji Yong , Xu Feng Ling
Published: July 2013

The surface with different water contact angle (θAW) was prepared through the use of self-assembled monolayers (SAMs) and the effect of water contact angle on the colonization of diatoms (Naviculasp andPinnulariasp) andUlvaspores (Pertusa) was researched in an optional environment. Results revealed that the statistical adhesion density of colonized diatoms have a reciprocal-proportional relationship with θAW, and the adhesive force increase with the increase of θAW. However, it was the other way round forUlvaspores. Different with previous primary adhesion study, it also was revealed that diatoms have selectivity in colonization stage. All of these must due to their different reproduce (or grow) mode and extracellular polymers (EPS) composition.
Uniformity Analysis of Temperature Distribution in the Grating Embossing Mold by Induction Heating
Authors: Zhi Jian Jun , Chen E Zhen , Che Yu Cai , Zhuang Qi Ren
Published: July 2013

In order to obtain uniform temperature distribution in an embossing mold heated by induction used for replica of plastic gratings, temperature fields in the mold are analyzed by using electromagnetic-thermal coupling field of ANSYS software. The results indicate that the air gap between the induction heating coils and heating element, and the coils current density, have a great influence on the temperature distribution, while the exciting frequency has little. When an exciting current of 1636 A*N, frequency 25 kHz and heating time as 70 seconds, the optimal air gap width is of 4 to 5 mm. At the same time, reduce the exciting current densities can improve temperature uniformity on mold surface.
Prussian Blue Modified Ferritin Nanoparticles as Peroxidase and Catalase Mimetics and their Application in Glucose Detection
Authors: Zhang Wei , Zhang Yu , Gu Ning
Published: July 2013

Prussian blue nanoparticles (PBNPs) have been certified a kind of mimetic enzyme possesses the advantages of stability, high catalytic activity and low prices. Ferritins are natural nanoscale structures with unique three-dimensional structures and biological functions. In this context, we synthesized PBNPs on the surface of the iron oxide core of ferritin taking use of the ferric iron of the core, we also intended to retain the specificity of ferritin for some biological use. Our results show the resulting nanostructures (Prussian blue-ferritin nanoparticles, PB-Ft NPs) got very small size and relatively high catalytic activity , furthermore, PB-Ft NPs successfully combined the intrinsic enzyme mimetic activity of PBNPs and the specificity to tumor cells of ferritin. The peroxidase-like activity and catalase-like activity of PB-Ft NPs were studied. Peroxidase-like activity which fits well the Michaelis-Menten kinetics was found strongly depending on pH, temperature and the concentration of PB-Ft NPs. Then a sensitive method for glucose detection was developed using glucose oxidase (GOx) and PB-Ft NPs. PB-Ft NPs displayed catalase-like activity in PH higher than 5.0, the generated oxygen was measured by the dissolved oxygen electrode.Enzyme-linked immunosorbent assay (ELISA) shows PB-Ft NPs possess both specificity and peroxidase-like activity.
Single Phase Pyrite Synthesized via Hydrothermal Method
Authors: Yang Zhao Tang , Liu Xiao Jiang , Liu Jing Song , Feng Xiu Li
Published: July 2013

Single phase pyrite has been successfully prepared via the reaction of FeSO4·7H2O, S and Na2S·9H2O using hydrothermal method. The X-ray powder diffraction measurements confirm the formation of iron disulfides in the pH range of 1-12. Marcasite is formed at pH<4, the marcasite contents in the final products increasing with decreasing pH; when the pH is higher than 4, the final product is single phase pyrite. Scanning electron microscope (SEM) images reveal that both the pH and temperatures have significant effects on the size and morphology of final products. Pyrite micro-nanocubes of 200-400nm in length were synthesized at pH=9. Detailed information of the experimental results are analyzed in the results and discussion part.
A New Packaging Method of Alkali Metal Simple Substrate and Related Key Techniques
Authors: Chen Shuo , Ruan Yong , Ma Bo
Published: July 2013

The vapor cells, which contain the simple substrate of alkali metals, are usually the key part of MEMS atomic devices. Alkali metal is extremely active with oxygen and water, making it incompatible with some necessary MEMS process since the instruments are not oxygen-proof. By using paraffin to packet the simple substrate of alkali metals, rubidium for example, the oxidation and deterioration of the metal can be avoided, making it easier to transfer Alkali metals into the vapor cells. It has also been reported that paraffin can serve as a wall-coating material to improve the Q-factor and the long-term frequency stability of the atomic devices. A mold method of manufacturing the package is introduced along with the related key technologies. Laser beam method and needle mold method are discussed to make blind holes on the paraffin wax layer. Paraffin packages containing rubidium simple substrate has been achieved, ranging from 0.9mm3 to 1.6mm3 in size, with the smallest one containing 0.2μL of rubidium inside. The sealing performance of the package has been tested in a one-month (30 days) test and proves to work well by judging from the color of the sealed metal. A low-temperature anodic bonding process is introduced for the fabrication, and absorption spectrum of the vapor cell is obtained, proving that alkali metal simple substrate has been transferred to the vapor cells.