bluuebunny/crossref_metadata_2025 huggingface dataset:
Properties of Concrete with High-Volume Limestone Powder under Low Temperature Conditions
Authors: Song Shao Min , Bao Wen Zhong , Zhao Wen Xin , Jin Dong Min
Published: March 2013

This paper studies the effects of high-volume composite mineral admixture made of limestone powder and low-quality fly ash on the properties of concrete,and studies the form of attack of cement-based material made of limestone powder at low water-binder ratio under low-temperature sulfate environment.Through experiments, this paper makes clear the workability of fresh concrete and analyzes the law of strength development of concrete. The experimental results indicate that the concrete with high-volume limestone powder as composite mineral admixture has good fresh properties; due to low water consumption per unit volume, medium-and-high-strength concrete can be prepared. As new type concrete mineral admixture, the composite mineral admixture made of limestone powder and low-quality fly ash will play an active role in the sustainable development of concrete industry. After the specimen with the water-binder ratio of less than 0.4 and the limestone powder volume of greater than 20% is soaked in 10% magnesium sulfate solution at low temperature at the age of 200d, gypsum attack-led destruction is caused to the concrete test cube, without thaumasite sulfate attack.
Effect of Synthesis Parameter on Properties of Heat-Sensitive Nanocapsules
Authors: An Pu Ying , Yu Zhao Yun , Zhang Hai Song , Ba Xin Wu
Published: March 2013

The crosslinked poly(methylmethacrylate) (PMMA) heat-sensitive nanocapsules were prepared by emulsion polymerization, in which Triton X-100 was used as an emulsifier and unsaturated hyperbranched poly(amide-ester) (UHBP) as a crosslinker. The effects of three determinative process parameters on the particle size distributions, glass transition temperatures(Tgs) and heat sensitive color-developing properties of nanocapsules were investigated in detail. As a result, the mean size of nanocapsules became smaller and their particle size distribution became narrower with the increase in emulsifying rate. The Tg of nanocapsules was 123.8°C with the emulsifier content being 0.6%. The color-developing absorbency was the highest with the crosslinker content being 6.0 %.
Coaxial Electrospinning with Ethanol Aqueous Solution for Preparing High Quality Zein Nanofibers
Authors: Yu Deng Guang , Wang Xia , Li Xiao Yan , Li Ying , Tang Shi , Zhao Xu Yao
Published: March 2013

A modified coaxial electrospinning process is developed for producing thinner zein nanofibers. With ethanol aqueous solutions as sheath fluids, high quality zein nanofibers have been successfully generated using the modified process. Electron scanning microscope results demonstrate that the nanofibers have better quality than those produced by a single fluid electrospinning in terms of nanofiber diameters and their distributions. The former has an average diameter of 1230±340 nm while the later 420±140 nm under a sheath-to-core flow rate ratio of 0.267. The mechanism is proposed that an appropriate ethanol aqueous solution surrounding the core zein jet helps to retain it in a fluid state to experience a longer time and more stable electrical drawing, with little adverse influence on the zein chain entanglements in the core fluid jets and thus its electrospinnability. The modified coaxial electrospinning process described here extends the capability of electrospinning process and opens a new way to obtain thinner nanofibers of macromolecules with fine structural uniformity.
The Experimental Study on the Inhibition Effect of Fusarium oxyspomm with Bio-Slurry Based on Material Properties
Authors: Fang Meng Ying , Liu Li Chun , Yin Fang , Zhang Wu Di , Liu Shi Qing , Zhao Xing Ling , Chen Yu Bao , Liu Jing , Xu Ling
Published: March 2013

Using petroleum ether to extract the fermentative fluid (bio-slurry), then to get the inhibition mechanism of it, and infer which is the main component in inhibition mechanism of biogas. The conclusion found by the experiment is that fat soluble substance is better than water soluble substance in inhibition mechanism, and fat soluble substance is close to 75% biogas fermentation fluid, while water soluble substance is worst. That is to say, the main subject in inhibition mechanism is hided in the fat soluble substance.
The Effects of Temperature and Time on Cu-Ce Infiltration Layer of 304 Stainless Steel by Double Glow Plasma Surface Metallurgy
Authors: Tang Feng , Xu Jin Yong , Tang Yan , Gao Cheng , Gao Bo , Tang Liang
Published: March 2013

The Cu-Ce infiltration layer was formed on 304 Stainless Steel surface by double glow plasma surface metallurgy technology. The effects of heat insulation temperature and heat insulation time on surface alloying concentration, surface hardness and infiltration layer depth were analyzed by comparative test. The results showed: In the experimental range, the contents of Cu and Ce, surface hardness, diffusion layer depth increase with the temperature and time increasing; the deposition layer depth increases with time increasing and decreases with temperature increasing in a certain range.
Two Rheometers Comparative Study of Detecting the Rheological Properties of Di-acetate Cellulose Acetone Solution Spinning with Properties of Chemical Raw Material
Authors: Shi Na , Zhao Qian Cheng , Yang Chong Chang
Published: March 2013

In this paper we used rotational rheometer and capillary rheometer to study the slurry rheological properties and compared the consequences.The experiments showed that di-acetate cellulose acetone solution is a typical non-Newtonian fluid,with the increase of temperature and shear rate , the viscosity decreased.When the temperature was 50-65 °C,the measured values change of the capillary rheometer was greater.
Experimental Study on Energy Conversion Efficiency of Biogas Fermentation of Sorghum Distilled Residue Based on Properties of Raw Materials
Authors: Yang Bin , Yang Fa Gen , Zhang Wu Di , Yin Fang , Zhao Xing Ling , Liu Shi Qing , Xu Ling , Chen Yu Bao , Liu Jing
Published: March 2013

In order to gain biogas production potential and energy conversion efficiency of biogas fermentation of sorghum distilled residue (SDR), the anaerobic batch fermentation experiments were performed at 30 degrees Celsius. After experiments, we got experimental results as follows: biogas production of SDR during total fermentation time of 28days is 2885mL; properties of raw materials including: TS is 88.58%, VS is 16.69%, heating value is 15.684kJ/g, TS biogas yield is 220mL/g, VS biogas yield is 1300ml/g, raw material biogas yield is 190mL/g, and energy conversion efficiency of biogas fermentation of SDR is 30.38%. The results indicate that biogas fermentation is an effective new method to recycle clean energy from SDR.
Railway Passenger Trains Information Inquiry System Based on Short Message Modem
Authors: Ji Shou Wen , Li Cong Cong
Published: March 2013

This paper advocates a way which is cheap and has a wide popularity--Short Messaging Service (SMS) to achieve railway passenger trains information anywhere and anytime instantly. This system not only accomplishes the railway passenger trains’ data collection, extraction, analysis and creates the Access database but also realizes access for database by application of PowerBuilder programming language and feedback appropriate information to the users via the way of SMS. It makes mobile phone users achieve all kinds of railway passenger trains information easily and supplements the shortcomings and deficiencies of the other current query systems.
Evaluation of the Efficiency of Information Sharing Policies Using a TOPSIS Method in Materials Supply Chain
Authors: Wang Hong Wei , Yan Yu Song
Published: March 2013

Information sharing is an important component of coordination in materials supply chain. Proper selection of information sharing policy has a significant impact on materials supply chain performance, especially in reducing costs and raising customer-service levels. However, it has long debated how the different policies affect the materials supply chain performance. This paper designs different information-sharing policies to analyze the supply chain performance through a simulation model. Finally, a technique for order performance by similarity to ideal solution (TOPSIS) method is used to evaluate the overall performance of each information-sharing policy.
The Design and Research of Quantitative Packaging System for Industry Manufactruing Based on PLC
Authors: Wu Yan Xiang , Zhang Li , Zhang Chao Jun , Zhou Chao Qun
Published: March 2013

This article designs and realizes a variable-frequency feeding system for quantitative packaging based on PLC. By analyzing diversified factors that affect precision and speed in weighing process, this paper puts forward a hybrid control strategy which combined fuzzy control and traditional PID control. The proposed control system meets the control requirements of high precision in weighing and improves production efficiency. The practical results show that the system possesses a desirable application value in the modern industrial manufacturing.
Study on Industrial Automation with SCARA Robot Vision System Design
Authors: Wu Xin , He Hong Yin , Lan Gong Jin , Tang Jin Tian
Published: March 2013

To realize scara robot in industrial automation work environment identifying target objects independently, this paper puts forward a kind of machine vision solution based on opencv . First the k neighbor average filtering method and otsu is used to the initial image filtering and segmentation, and given a method based on pixel area, using the target object itself geometric characteristics and center of mass calibration to identify, locate purpose. The experimental results show that the system can achieve good object identification orientation effect in more complex industrial automation environment, so as to provide the necessary information for scara robot to grab target objects.This kind of robot vision system play an important role in industrial automation.
The Research on Solar Cell of a Novel Ribbon Silicon Material
Authors: Li Jian Gong , Wu Peng , Yu Peng , Li Shuai
Published: March 2013

Ribbon silicon material is specially designed for solar cell wafers. In this paper, a novel ribbon silicon material “dipping method” has been designed in order to lower the cost of solar cell. The principle and procedure of dipping method were described. In addition, the diffusion of impurities in the silicon wafer and its influence on the efficiency of solar cells were investigated. The photovoltaic performance of polycrystalline silicon solar cells which were based on the metallurgical grade silicon substrate with the thickness of 600μm, was simulated by AMPS1-D software. And some import parameters were obtained including I-V characteristic, 17.004% conversion efficiency. This artic is provided theoretical support to the industrial production of solar cells by dipping method, and it will open a new road to production low cost solar cell.
Fluid Mechanics Analysis and Effect of Splitter Blades on the Characteristics of High-Speed Centrifugal Pump
Authors: Liu Jun , Yuan Jian Ping , Zhang Wei Jie
Published: March 2013

Due to its single-stage high head, compact structure, convenient maintenance, low cost and high reliability, the high-speed centrifugal pump has been widely used in refining, petrochemical, chemical industry, and aerospace engineering fields. However, as the speed increases, the increasingly high demand for stability is showing and cavitation characteristics of the high-speed centrifugal pump is emerging. Reducing the mechanical vibration, hydraulic losses and improving the pressure distribution of the high-speed pump have become one of the main research fields for high-speed pumps. Three types of splitter blades were designed in this paper. Numerical simulations of the 3D steady flow in the high-speed pump have been carried out by using the software ANSYS CFX 12.0 and the comparative analysis of the velocity, pressure distributions and fluid mechanics in the high-speed pump under three different flow conditions were also carried out，Respectively. The effects of splitter blades on the high-speed pump performance were studied by analyzing both its inner flow field and hydraulic performance. The calculated H-Q curve of the high-speed pump was compared with the test results, and they agreed well with each other. The relative error of head at design conditions was lower than that at the non-design conditions.
The Lattice Distortion-Induced Topological Insulating Material
Authors: Han Hong Pei
Published: March 2013

We have carried out a series of calculations to investigate the electronic band structure of bulk HgTe strained along c-direction with the constant-volume by means of the full potential linearized augmented plane-wave method. Our results show that there is a topological insulating phase induced by the lattice distortions, which is in agreement with previous theoretical and experimental results. Importantly, the distortion-induced band gap is large up to 0.19 eV in either expansion or compression along c-direction. It is indicated that the bulk HgTe under proper lattice distortions would be possibly made the room temperature application for material engineering with low energy consumption.
Study on Residual Stress and Numerical Simulation Technology of Welding to Thick Structure Construction
Authors: Li Ming , Li Ning , Liu Yu , Wang Qing Shan
Published: March 2013

In this investigation, a method combined with thermal-elastic-plastic finite element method and thermo-mechanical coupling method is proposed based on equivalence principle, which is used to predict residual deformation of large thick spherical structure after welding. In this solving framework, according the relationship of strain-stress of welding material, equivalent temperature load of single weld is obtained firstly, and then extended to other welds. Thus, the prediction of welding deformation for large thick spherical structure is obtained. Based on numerical analysis, the optimization of welding position is carried out. Then the optimum welding scheme of large thick spherical structure is presented. The numerical simulation in this paper provides theoretical basis for the process of large thick spherical structure. Moreover, it also provides a reliable method to predict the strain of large thick spherical structure.
Study on the Characteristics of the Hull Vibration Caused by the Shaft Surface Roughness
Authors: Li Zhuo , Gao Yang , Xie Xiao Zhong , Chen Lin
Published: March 2013

Nowadays vibration of hull caused by the shaft surface roughness has caught attentions all over the world. In this paper we conducted a brief analysis on this project based on the contact theory and FEM. Firstly, we calculated the contact force based on numerical simulation and contact theory. Then we analyzed the effects of speed and shaft surface roughness on the hull vibration. Results show that the effect of shaft surface roughness on the hull vibration is greater than that of speed. But when the frequency of contact force gets close to the natural frequency of hull, the effect of speed becomes obvious. These conclusions have large significance on the selection of shaft and the design of hull.
Research on Electrical Power System with Information Modeling and SCL Description of IED for Transformer Condition Monitoring Based on IEC61850
Authors: Sun Yun Tao , Tang Xin Jian , Li Jue Long , Jiang Xiu Chen
Published: March 2013

A transformer is a critical device in an electrical power system substation. Monitoring its condition, including insulation material statuses, is imperative. This article discusses the information modeling techniques of IEC61850 and modeling steps of condition-monitoring IED, analyzes the reporting service, focuses on the characteristics of transformer condition monitoring, rationally develops and makes use of logical nodes and data in the IEC61850 standard, conducts modeling for the actual intelligent electronic device (IED) of transformer condition monitoring and describes the model with substation configuration description language (SCL). The configuration file of this model has passed the test done with standard syntax (Schema mode).
Research on Electrical Power System with Analysis of Fault Operation State Magnetic Field about DFIG in Wind Power
Authors: He Shan , Wang Wei Qing , Wang Hai Yun , Zhang Xin Yan , Cheng Jing , Chen Jie
Published: March 2013

Doubly-fed Induction Generator (DFIG) is an important equipment in electrical power system. Operation state of DFIG is complex: it works at subsynchronism, synchronization and hypersynchrony state. Electromagnetic field is various. There is winding on stator and rotor, it’s more possible for fault to happen. Text discuss structure of DFIG, finite element method (FEM) model including stator rotor and air-gap is created, typical magnetic field is calculated including normal operation state, turn-to-turn and single-phase short-circuit happened, result is analysed, distribution discipline of multiple magnetic field is obtained. It provide the evidence to early failure prediction, basic data to develop and design high-capacity generator, optimize structure and magnetic field analysis of DFIG.
New Theories and Methods of Low Frequency Oscillation Analysis under Smart Grid Framework in Electrical Engineering
Authors: Liu Zhi Jian , Huang Rong , Zhou Shu Ming , Hou Yu Cheng
Published: March 2013

The low-frequency oscillation is one of the most important reasons that affects the stability of the power system. Under the background of building a unified and strong smart grid, the scale of the power system will continue to expand, the interconnection of systems will be more closely, the structure will be more complex, these factors will further increase the difficulty on the low-frequency oscillation control. This paper summarizes the methods to analysis low frequency oscillation signal, the way that suppresses the low frequency oscillation in electrical engineering. Further, based on smart grid framework, a on-line visualization technology and a self-recovery regulation strategy are proposed to damp low-frequency oscillation.
Low-Speed Common Rail Diesel Engine Electronic Control System Structure and Working Principle in Electrical Control Engineering
Authors: Song En Zhe , Wang Ya Fang , Liu Yu Fei , Zhang Zhan Hu , Shi Xing Chao
Published: March 2013

The performance of Diesel engine control system influence the engine combination property directly. The traditional mechanical control system can't meet the requirements of the fuel consumption and emissions. We should turn to the advanced electronic control system. This article introduced the basic frame and control mode of low-speed common rail diesel engine electronic control system, and according to the control object, the whole control system is divided into different modules to detailed analysis.
Studies on Power Distribution of AC and VSC-HVDC Hybrid System for Wind Power Integration
Authors: Zhang Yue Qiang , Zhu Yong Qiang , Liu Yan Zhang
Published: March 2013

In order to study the power distribution strategy of AC and VSC-HVDC hybrid system for wind power integration, a strategy based on improving the transmission capacity of AC lines and reducing the power loss is proposed. By use of the decouple control of active and reactive power of the VSC-HVDC, the transmission capacity of the AC lines can be improved by absorbing enough reactive power, AC lines have the priority before they have reached their transmission limit, meanwhile the VSC-HVDC acts as STATCOM. When the AC lines have been fully used, the VSC-HVDC will act as STATCOM as well as transmit the rest power. A DFIG wind power integration system is set up by use of PSCAD/EMTDC, the simulation results show that the power distribution strategy can realize the wind power integration successfully and reduce the power loss, it can regard as a good method for wind power integration.
Study of the Electricity-Draw Control System in Electrical Engineering Based on Neural Network DTC
Authors: Shi Lu Huan , Li Yao Hui
Published: March 2013

In the electricity draws control system, the change of Low-velocity area of Rs will bring about a series of problem, especially the stator current and flux, will cause the distortion of the speed pulse vibration. The test discussed control scheme and optimization designs of asynchronous draw motors from exchange transmission electric locomotive operation characteristic demand. It adopts control strategy of neural network direct torque control (DTC) to control electricity draw the locomotive, to analyze the reacting of starting and sudden change of load, verifying this method may effectively improve the dynamic performance of the asynchronous motor, got up the very good inhibitory action to the low speed area torque pulsation. Thus the simulation results have proven the neural network DTC control strategy feasibility.
A Fault Phase Selection Method Based on Arc Voltages for High-Voltage Line Protections in Electric Power Systems
Authors: Zeng Xiao Hui , Chen Yong Hui , Tan Gong Quan
Published: March 2013

A fault phase selection method is proposed based on arc voltage after analysis of inadequate of fault phase selector existed in the paper. A precise fault phase selection can be achieved by using arc voltages in conjunction with phase current differences and sequence components of currents. The method proposed can solve false tripping problems in transmission line protections when single phase to ground faults occur with great reliabilities. Simulation results show that the method can identify faulted phase or phases correctly and effectively.
Optimal Dispatching of Electrical Sensors for Automatic Control
Authors: Liu Jian Liang , Yang Jian , Liu Wei Yi
Published: March 2013

In this paper, we consider an electrical sensor dispatching problem for automatic control systems(ACS). We propose an algorithm which selects one (or a group of) electrical sensor at each time from a set of electrical sensors. Then, the automatic control prediction algorithm computes the estimates of the continuous state and the discrete state of the ACS based on the observation from the selected electrical sensors. As the electrical sensor dispatching algorithm is designed such that the Bayesian decision risk is minimized, the true discrete state can be better identified. At the same time, the continuous state prediction performance of the proposed algorithm is better than that of automatic control prediction algorithms using only predetermined electrical sensors. Finally, our algorithm is validated though an illustrative target tracking example.
Research on Fault Diagnosis of High-Voltage Circuit Breaker in Electrical Power System Based on KPCA
Authors: Wang Yi Ping , Mei Fei , Zheng Jian Yong , Mei Jun
Published: March 2013

High-voltage circuit breakers (HVCBs) play an essential role in electrical power systems, which can ensure and control the smooth operation of power grids. Therefore, a fault diagnosis method of HVCBs based on Kernel Principal Component Analysis (KPCA) is proposed in this paper. As the fault data of HVCBs have the characteristic of multi-dimensional nonlinearity, the proposed method calculates inner kernel function of HVCBs' closing current in the original data space so as to achieve nonlinear mapping to the feature space of the original data. Afterwards, feature extraction and pattern classification of fault data can be accomplished in the feature space by means of monitoring SPE statistics. Experiment results have proved that the KPCA method can effectively improve the precision of fault diagnosis of HVCBs.
Honing TC11 Titanium Alloy Material the Choice of Stone
Authors: Liu Yan Shu
Published: March 2013

Based on the study of cutting properties of titanium alloy, and according to its features, several commonly used honing stones materials are selected to carry out the wear experiments of deep-hole honing for the alloy. the analysis of the experiments results shows the suitable for titanium alloy TC11 deep-hole drilling is identified.
Research of Grid-Connected Photovoltaic System in Electrical Engineering with Energy Storage Based on DC Bus
Authors: Shi Chang Li , Tang Xi Sheng
Published: March 2013

A novel grid-connected photovoltaic system in electrical engineering with energy storage based on DC bus is proposed, which can integrate a microgrid system into a single device and make the development of distributed generation more flexible and accessible. The system is controlled to keep the voltage of DC bus constant, to utilize solar energy effectively and to prolong battery’s life. The control strategies of each of the subsystems are designed based on their characteristics and system requirements. The energy flow states containing all the possible operation states of the DC bus based system are presented in this paper, followed by the process control state machine to illustrate the energy management strategies is achieved. Finally, a simulation platform is established in MATLAB/Simulink to verify the presented control method.
Modeling Permanent Magnet Synchronous Motor System in Electrical Automation Engineering Based on Adaptive Neuro-Fuzzy Inference System
Authors: Zhang Hui Ying
Published: March 2013

This paper proposes a novel modeling method for permanent magnet synchronous motor (PMSM) system in electrical automation engineering based on adaptive network based fuzzy inference system (ANFIS). Meanwhile the microhabitat particle swarm optimization (MPSO) was used for training the parameters of ANFIS. The proposed modeling method for PMSM system can help in speed and position control. The proposed ANFIS and MPSO based modeling method has been successfully applied to PMSM control system.
The Software Design for an Automation Intelligent Distribution Terminal Unit in Electric Power Systems Based on C and Assembly Language
Authors: Song Hong , Zeng Xiao Hui , Zhou Wei Peng
Published: March 2013

Electric power distribution systems play an important role in electric power systems, in which automation intelligent distribution terminal units are critical for the performance of power distribution systems. The software of an automation intelligent electric power distribution terminal unit based on digital signal processor is designed in the paper, a way of admixture programming with C language and assembly language. In this manner, real-time requirement on the electric power distribution system will be satisfied, the reliability and stability of the software are ensured as while. It has a broad application prospects in electric power systems.
Electrochemical Property Study of Water-Wall Tube 20G in SO42- Medium at Room Temperature
Authors: Li Mao Dong , Tang Xue Ying , Du Yu Hui , Liu Juan , Zhao Jun Ming , Zhu Zhi Ping
Published: March 2013

In the article, the effect of SO42-on the corrosion behavior of boiler water-wall material 20G under the equilibrium phosphate treatment (EPT) was studied by a series of electrochemical experiments at room temperature. Electrodes AC impedance value (Rp) was used to evaluate the corrosion resistance of the material. The experiment results show that, SO42-ion is aggressive anion; water-wall tube material 20G has certain sensitive corrosion to the SO42-. The 20G electrode AC impedance value decreases with the increase of the SO42-’s concentration and the material corrosion resistance reduces.
Design and Implementation of Synchronous Wireless On-Line Detection System of MOA Resistive Current in Electric Power System Based on GPS
Authors: Cui Tao , Cao Yong Xing , Xu An , Li Jue Long , Sheng Ge Hao
Published: March 2013

Metal oxide arresters (MOA) are important apparatus defending electric power systems against lightning strikes. The resistive current value of MOAs can reflect equipment status better. In conventional methods measuring resistive current of MOAs, wires need to be connected to the secondary side of voltage transformer during each test, and this brings great safety risks. A new wireless method is proposed to measure resistive current of MOAs. Based on GPS and wireless transmission module, wireless synchronous measurement of portable current detector and voltage monitor can be implemented. Fourier Sequence algorithm is applied to detect the resistive current of MOA. System compositions, design and methods of hardware implementation is focused on in this paper. Lab experiment and on-site testing results show that the method is satisfactory.
Application of Si in Tool and Die Steel
Authors: Huang Shi Hong , Lei Ting , Chi Hong Xiao , Ma Dang Shen
Published: March 2013

This paper analyzed the application status of Si in high speed tool steel, cold working die steel, hot work die steel and plastic die steel. On this basis, the effect of Si on the properties of different types of tool and dies steels is summarized. There is the certain reference value of the application of Si in tool and die steels.
Enhanced Oil Recovery with Properties of Thermoplastic Material by Hot CO2 Flooding
Authors: Han Chun Juan
Published: March 2013

The thermoplastic composite material is glass fiber, carbon fiber, aromatic fiber and other materials to enhance various thermoplastic resins abroad collectively, known as a FRTP. Enhanced Oil Recovery (EOR) techniques helps to recover residue oil after Primary and secondary recovery of reservoir. This paper deals with a new Carbon Di Oxide (CO2) EOR technique, “HOT CO2” which includes combination of thermal and solvent techniques where miscibility and viscosity reduction are primary concern. In the proposed method CO2 will be superheated above the reservoir temperature to reduce the oil viscosities at the same time partially mix with crude oil which improves oil mobility. “HOT CO2 flooding” will going to be one the best option for EOR in future.
The Application of Absorbable Suture Materials and Tissue Engineering on Renovation of Exercise-Induced Anadesma Injury
Authors: Zhang Shao Qing , Hou Jiang Yuan , Wang Guo Qiang
Published: March 2013

The ligament injury is the common sport injury in the athletic sports training, the progress and development of suture technique provides a good guarantee for the treatment of tear and rupture tendon, ligament tissue units, the use of absorbable suture materials can prevent in partly risk of Treatment induced by no absorbable suture materials. Therefore, the absorbable suture materials are generally favored by both doctors and patients. The absorbable sutures can be degraded into soluble product in the body, thereby it reducing the patients with second operation pain and minimize patient suture in scar formation, it get the more and more favor of both doctors and patients. The different materials of absorbable sutures were appeared, which meet the people's needs to some extend.
Research on Electron Mobility Model for Tensile Strained-Si(101) with Properties of Semiconducting Materials
Authors: Meng Nan , Hu Hui Yong , Zhang He Ming , Shi Xu Jia , Xuan Rong Xi , Wang Bin
Published: March 2013

Abstract. Mobility is one of the most important properties of semiconductor material, and it has a great impact on the property of MOS devices.In this paper, the influence of ionizing impurity scattering, acoustic phonon scattering and intervalley scattering to strained-Si(101) material is discussed.In addition, a calculation of the electron mobility in Strained-Si(101) material is made using the average momentum relaxation time method described in Ref[1]. The results show that the electron mobility increases gradually for both [001] and [100] orientations while for [010] orientation increases rapidly with the increasing Ge fraction x.
Study on Beneficiation of a Low-Grade Refractory Copper Oxide Ore in Tajikistan
Authors: Ding Peng , Liu Quan Jun , Pang Wen Hao
Published: March 2013

Experimental investigation was conducted on a low-grade copper ore in Tajikistan with grade of 0.89% and oxidation rate of 99%, which belongs to refractory oxide copper with low-grade and high oxidation rate. According to the property of process mineralogy, using vulcanization xanthate flotation process, determined once rough concentration, three times cubic concentration and three times scavenger concentration process, eventually obtained copper concentrate with grade of 15.26% and recovery rate of 85.90%.
Effect of Four Materials Including Glycine, Arginine, Proline and Sodium Glutamate on Survival of Bifidobacterium bifidum during Freeze-Drying
Authors: Ma Qi , Qin Tao , Chen He , Shu Guo Wei
Published: March 2013

Effect of four materials including glycine, arginine, proline and sodium glutamate on survival of Bifidobacterium bifidum during freeze-drying was studied by measuring the viable counts of before and after freeze-drying. The addition of glycine, arginine, proline and sodium glutamate (%, w/v) were all 1.0%, 2.0%, 3.0%，4.0% and 5.0%. Results were as follows: addition of glycine, arginine, proline and sodium glutamate into B. bifidum paste could significantly improve the survival rate of B. bifidum and the number of viable cells of lyophilized powder. The optimal concentrations of glycine, arginine, proline and sodium glutamate were 4.0%, 4.0%, 3.0% and 2.0%, the survival of B. bifidum was 87.49%, 84.28%, 67.50% and 69.01%, respectively.
Effect of the Process of Lamination Microporous Nanofiber Membrane on the Evaporative Resistance of the Two-Layer Laminate
Authors: Heinisch Tereza , Bajzík Vladimír , Knížek Roman , Gregušová Zdeňka
Published: March 2013

This thesis deals with the assessment of the effect of the process of lamination microporous nanofiber membrane on the overall evaporative resistance of the two-layer laminate. For most multi-layer materials, lamination process is due to the deterioration of some properties of the whole laminate, particularly to the increase of the evaporative resistance. The authors of this thesis investigate the effect of the lamination primarily on the evaporative resistance of two-layer laminates. The study deals with the relations of volume porosity with the values of the evaporative resistance of the laminate too. In this thesis are both measured the separated layers of selected materials (upper material and the membrane), then the surface materials with the coated lamination points and subsequently created two-layer laminates.
Design, Simulation and Optimization of a New Micro-Structural Gas Sensor
Authors: Zhang Xiao Bo , Liu Chang Bai , Liu Li , Shan Hao , Wang Lian Yuan , Li Shou Chun , Chi Xiao , Bo Xiao Qing
Published: March 2013

Micro-structural gas sensor with a new kind of electrode is designed. Platinum filament is selected as gold electrodes, and SiO2 is used as the thermal and electricity insulation layer. The simulation results of ANSYS reveal that when the thickness of SiO2, thickness of Si substrate, electrode with and electrode space are 50, 250, 15 and 60 µm, respectively, the sensors can own higher temperature and uniform temperature distributing in the center. The magnetic field distribution is also analyzed by ANSYS, and the results show that the new electrodes can eliminate magnetic field from the heater on the measuring signal interference, which is benefit for the improvement of sensor performance.
Numerical Studies of the Squeeze-Film Damping of MEMS Devices with Perforations in the Non-Continuum Regime
Authors: Yu Feng , Li Pu , Wang Zhuo
Published: March 2013

Predicting squeeze-film air damping of resonators in rare air is crucial in the design of high-Q devices for various applications. In the past, there have been two approaches to treat the squeeze-film air damping in non-continuum regime: using effective viscosity coefficient and using the molecular dynamics method. And most of the previous work focused on devices in which the rarefaction effects of air are not significant. For such cases, continuum theory is often adequate. However, we have investigated the air damping on oscillating structures in the free molecular regime in which classical continuum theory is no longer valid. Based on this premise, Hutcherson (2004 J. Micromesh. Microeng. 14 1726-1733) has developed a molecular dynamics simulation code and used in predicting quality factors of an oscillating micro-plate at low pressures. However, his work is valid only for non-perforated micro-plate. This paper, a brief description of the molecular dynamics method is presented first. Then a molecular dynamics simulation code has been developed and used in predicting quality factors of a perforated oscillating micro-plate in free molecular regime. And we have found that the molecular dynamics simulation results have shown an excellent agreement with the experimental data of Kwok et al. Finally, the limitations of the present molecular dynamics simulation code have been reported.
Constrained Structural Optimization of Electro-Thermal Microactuator Using Double Chromosome Genetic Evolution
Authors: Shih Chien Jong , Lin Po Hung
Published: March 2013

This paper presents two design optimization models for U-type electro-thermal microactuator. The result shows that the unequal arm model has better performance than the equal arm model. The models were solved by finite element analysis that are verified and comparison to publish paper and then are utilized in optimum design. The feature of presenting work contains temperature constraints to avoid the harm of operating object and decrease stress concentration on flexure. For handling design constraints, a method named double chromosome genetic evolution (DCGE) is developed in gene based algorithm. The idea of the presenting constrained strategy was inspired from the gene evolved by double helix chromosome of expressing certain traits. The constrained evolutionary algorithm proposed in this work is efficient and reliable. It can be integrated into a broad field of engineering optimization.
Processing Science of Isotactic Polypropylene Fiber Reinforced with Halloysite Nanotubes Based on Masterbatch Dilution Technique
Authors: Lu Yang , Lee Andre , Wen Xiu Fang , Pi Pi Hui , Cheng Jiang , Yang Zhuo Ru
Published: March 2013

The properties of nanocomposites can be improved significantly by the addition of nanoparticles into polymer. Nanocomposites of isotactic polypropylene (iPP) and Halloysite Nanotubes (HNT) at 100/0 and 99.2/0.8 weight ratios were prepared in a co-rotating twin screw extruder using masterbatch dilution technique. IPP/HNT fibers were obtained in a single-screw extruder with extrusion temperature of 231°C, screw speed of 1.38 rpm and 0.6mm diameter die L/D of 6. The effect of processing variables, such as pick-up speed (0.05m/s, 0.15m/s and 0.45m/s), horizontal distance (0, 0.5m and 1m),and annealing (120°C), were investigated. The air cooling time was crucial for fiber processing and exhibited a linkage with crystal morphology, degree of crystallinity as well as the mechanical performance of the fiber. More importantly, the incorporation of HNT into isotactic polypropylene reduced the deficiencies of the annealing process on the toughness and elongation at break of the pure polypropylene fibers, and significantly enhanced the tensile strength of the fiber.
Flow Behavior and Microstructural Evolution of 316 Stainless Steel under Hot Compression
Authors: Wu Horng Yu , Zhu Feng Jun , Chiu Chui Hung , Liu Hsu Cheng , Wu Cheng Tao
Published: March 2013

Hot deformation characteristics of 316 stainless steel were investigated at elevated temperatures. Hot compressive tests were carried out in the temperature and strain rate ranges from 900 to 1100 °C and 1 × 10−1 to 1 s–1, respectively. Correlation between the flow behavior and the microstructural evolution was analyzed. The flow behavior showed that the softening mechanisms were related to the dynamic recovery (DRV), dynamic recrystallization (DRX), and grain growth. Flow behavior analyses and microstructural observations indicated that DRV was the major softening mechanism at high strain rates and low temperatures. Dynamic softening proceeded via a combination of DRV and DRX at intermediate strain rates and temperatures. The contribution of DRV to the softening effect decreased with decreasing strain rate (or increasing temperature). Grain growth was the major softening effect at low strain rates and high temperatures.
Curing Behavior of Epoxy Resin Mixed with Epoxypropoxypropyl Terminated Polydimethylsiloxane
Authors: Xi Zheng , Ding Jin Dian , Gan Wen Jun , Zhang Zhao
Published: March 2013

Diglycidyl ether of bisphenol A (DGEBA) and epoxypropoxypropyl terminated polydimethylsiloxane (ETDMS) were mixed in different proportion. The morphology of ETDMS modified epoxy systems was observed by scanning electronic microscope (SEM). Curing kinetics was also studied by differential scanning calorimetry (DSC). It was suggested that the formation of the microstructures followed reaction-induced microphase separation mechanism.
The Effect on a New Sintered Calcium Sulfate Ceramic to Osteoprogenitor MC 3T3-E1
Authors: Wu Li Chun , Liu Hsia Wei , Chen Ching Kuo , Kuo Jong Tar , Chou Hsien Kan , Chung Ying Chien
Published: March 2013

Among the bone graft biomaterials, calcium sulfate (CS) is a kind of resorbable calcium salt which is the earliest inorganic material used as a bone graft. Although it is well biocompatible, the dissolution rate is always too fast which cannot stay long enough to support bone regeneration effectively. Recently, a new type ceramic CS developed by AG Digital Co. LTD. has the far better improvement in dissolving rate and strength. The purpose of this study was to testify its performance on osteoprogenitor to ascertain the safety and effect of this new material. In our research, the secreted extracellular matrix protein and calcium mineralization showed different affections: the collagen concentration on ceramic CS was higher than on pure CS dihydrate in both 7 days and 14 day’s samples. The alkaline phosphatase (ALP) activity and calcium concentration remained identical before 7 days cultivation, but the activity of ALP and calcium sediment in ceramic CS were statistically higher than in pure CS dihydrate in 14 day’s cultivation. The results implied that the new material, ceramic CS, tend to accelerate the preosteoblast’s secretion of extracellular matrix protein. We found in this study by comparing the well-known CS dihydrate that the new ceramic CS shows benefit to osteoprogenitor cultivation.
Method of Life Prediction of Engine Cylinder Cover
Authors: Wang Yu Sheng , Ma Wen Xuan , Li Ming , Jin Hao
Published: March 2013

Cylinder cover is an important component of the engine. It is damaged by low cycle thermal fatigue, high cycle thermal fatigue and creep in operation. Thus, the life and reliability of the cylinder cover are important criteria for engines. The temperature field and stress field of the cylinder cover are computed by the sequentially coupled analysis method: the elastic strain, plastic strain and creep strain of the dangerous point on the cylinder cover are analyzed in ten startup-working-shut down cycles; and it is proved in theory that low cycle thermal fatigue is the primary factor affecting the service life of the cylinder cover and the startup time of the engine is an appropriate parameter to estimate the life of thecylinder cover. The creep has little influence on the stress amplitude, and makes the mean stress increased. The relaxation is coexisting with creep in high temperature; it reduces the increase speed of mean stress. After finite cycles, the mean stress tends to constant gradually. Therefore, the creep-fatigue interaction can equal to thermo-mechanical fatigue whose stress amplitude and mean stress are constant. At last, the mean service life of cylinder is predicted.
Modal and Twist Stiffness Analysis about Milling Head
Authors: Zhang Ming Yuan , Zhu Xiang Jun , Li Ming , Jin Hao
Published: March 2013

Milling head is the core component of a 5-axis CNC milling machine, modal and twist stiffness analysis is needed in its design process. Vibration characteristic of direct drive A/C milling head is been analyzed by finite element method (FEM), former four order vibration modes of the milling’s structure are given. The influence of the swing angle of the A-axis to the natural frequency of the milling head is analyzed. The natural frequencies when the milling head is working are interval values, the first order natural frequency is [120.48, 122.91], the second order natural frequency is [139.68, 142.08], the third order natural frequency is [328.68, 331.9], the fourth order natural frequency is [369.68, 372.45]. The twist stiffness that varies with operating state is computed. This computing provides technological support for design and improvement of this type of milling head.
Development of Tolerance Ring for Cleanliness in Assembly Process
Authors: Woraratsoontorn Pattaraweerin , Sooraksa Pitikhate
Published: March 2013

In arm hookup assembly process, the tolerance ring is commonly used for coupling a bearing cartridge to an arm hookup. This process often encounter cleanliness problem which is caused by metal scratch between the arm hookup and the tolerance ring. The main purpose is development the tolerance ring using finite element 3D model and validation of experimental result. The result shows that the simulation result corresponds to the experimental result, the vulnerable point effect less movement of the tolerance ring. Moreover, the cleanliness problem in process was eliminated also.
Numerical Simulation and Experimental Study on Profile-Rolling Process for Micro-Teeth Components
Authors: Chan Luen Chow , Kong Ting Fai
Published: March 2013

This paper presents a numerical simulation and experimental study on profile-rolling process for micro-teeth components. The target component was made of AISI 304 stainless steel with 6.0 mm outer diameter, and its number of teeth was 25. Three raw material rods with different diameters 5.6 mm, 6.0 mm, and 6.4 mm were investigated in the finite-element simulation. The spindle speed of the rolls was 60 rpm, and the material forward speed was 1.8 mm/s, which were reasonably compatible with the practical profile-rolling conditions. The simulation results showed that the different numbers of teeth were produced by employing different diameters of raw materials. Only the rod with the 6.0 mm diameter could be rolled into the near desired shape. Experimental verification was also undertaken. The numerical simulation was found to be in good agreement with the measured profile of the actual rolled component. The microstructure of the material after rolling was improved also as the hardness of the teeth was 40% higher than that of the core.
Finite Element Modal Analysis of Whole Structure of Spherical Grinder
Authors: Gong Xiao Xin , Lu Qiang
Published: March 2013

In order to analyze vibration characteristics of whole structure of the spherical grinder, the finite element analysis software is applied to finite element modal analysis of the structure. 3D model of spherical grinder is established by Pro/ENGINEER software. Finite element model of spherical grinder is established in the finite element analysis software ANSYS Workbench. The previous 6-order inherent frequencies and the corresponding vibration modes are obtained through the finite element calculation. According to the vibration intensity distribution, the corresponding improvement measure is put forward. It provides theoretical basis for dynamic analysis and improved design of spherical grinder.
The Research of the Wind Turbines Reliability Based on Characteristics of Wind Energy
Authors: Wang Huan , Pan Lei
Published: March 2013

The reliability based on characteristics of wind energy is the basic quality signing of the wind turbine. It is the important part of the product quality. The technique reliabilities include the designing manufacture and maintenance. It can be described “connatural reliability” and “using reliability”. The reliabilities include the reliability the average non-malfunction time reliability service life and so on.