bluuebunny/crossref_metadata_2025 huggingface dataset:
MoSi2 Composites for High Temperature Structural Applications
Authors: Uzunonat Yagiz , Uzgur Sinem Cevik , Diltemiz S. Fehmi , Kushan Melih Cemal , Ölmez Rabia
Published: February 2011

In this paper, the basic limitations of superalloys’ in high temperature performances will be explained and then after giving the important properties of MoSi2, some interesting composites of this material will be discussed as a candidate structural material for gas turbine engines.
Effect of Post Weld Heat Treatment on Fusion and Heat Affected Zone Microstructure and Mechanical Properties of Inconel X-750 Welds
Authors: Peasura Prachya , Poopat Bovornchok
Published: February 2011

The Inconel X-750 indicates good hot corrosion resistance, high stability and strength at high temperatures and for this reason the alloy is used in manufacturing of gas turbine hot components. The objective of this research was study the effect of post weld heat treatment (PWHT) on fusion zone and heat affected zone microstructure and mechanical properties of Inconel X-750 weld. After welding, samples were solutionized at 1500 0C. Various aging temperature and times were studied. The results show that aging temperature and time during PWHT can greatly affect microstructure and hardness in fusion zone and heat affected zone. As high aging temperature was used, the grain size also increased and M23C6 at the grain boundary decreased. This can result in decreased of hardness. Moreover excessive aging temperature can result in increasing MC carbide intensity in parent phase (austenite). It can also be observed that M23C6 at the grain boundary decreased due to high aging temperature. This resulted in decreasing of hardness of weld metal and heat affected zone. Experimental results showed that the aging temperature 705 0C aging time of 24 hours provided smaller grain size, suitable size and intensity of MC carbide resulting in higher hardness both in weld metal and HAZ.
The Influence of Welding Parameters on Effected the Complete for Resistance Spot Welding on Mild Steel
Authors: Peasura Prachya
Published: February 2011

This research was study the effect of resistance spot welding process on physical properties. The specimen was mild steel sheet metal. The experiments with full factorial design. The factors used in this study are welding current, welding time and electrode force. The welded specimens were tested by tensile shear testing according to JIS Z 3136: 1999 and macro structure testing according to JIS Z 3139: 1978. The result showed that both of welding current, welding time and electrode force had interaction on tensile shear and nugget size at 95% confidential (P value < 0.05). Factors affecting the tensile shear and nugget size are the most welding current 10,000 amp., welding time 10 cycle and electrode force 1 kN. were tensile shear 7.13 kN. and nugget size maximum 6.75 mm. This research can bring information to the foundation in choosing the appropriate parameters to resistance spot welding process.
The Time-Frequency Resolution of Short Time Fourier Transform Based on Multi-Window Functions
Authors: Wang Li Hua , Zhang Qi Dong , Zhang Yong Hong , Zhang Kai
Published: February 2011

The short-time Fourier transform has the disadvantage that is does not localize time and frequency phenomena very well. Instead the time-frequency information is scattered which depends on the length of the window. It is not possible to have arbitrarily good time resolution simultaneously with good frequency resolution. In this paper, a new method that uses the short-time Fourier transform based on multi-window functions to enhance time-frequency resolution of signals has been proposed. Simulation and experimental results present the high performance of the proposed method.
Preparation of Aramid Mica Composite Insulation Material
Authors: Zhang Xiao Wei , Liu Shu Peng , Qian Yu Peng , Zhu Ying Bo
Published: February 2011

While mica papers are used as insulation material binders and reinforcement materials are needed to enhance the mechanical strength which might reduce insulation property of mica paper materials. In this paper aramid fibers and mica flakes are mixed to make composite paper insulation, both have the high strength, heat resistance of aramid fibers and high dielectric strength, corona resistance of mica flakes. When this composite material is preparing, process of mix pulp papermaking was chosen, combined with mica flake and aramid fiber modification. Prepared composite material has properties of high tensile strength, dielectric strength, heat resistance, softness, can be used as high quality insulation.
Effect of Temperature on Microstructure and Electrical Properties of (Y, Ta)-Doped TiO2 Capacitor-Varistor Ceramics
Authors: Wang Tian Guo , Qin Qun , Zhang Wen Jun
Published: February 2011

The microstructure and nonlinear electrical behavior and dielectric properties of the varistor, which are composed of (Y2O3, Ta2O5)-doped TiO2 ceramics, were investigated for various sintering temperatures. It is assumed that the moderate sintering temperature improves the permitivity of TiO2 ceramics, together with high nonlinear properties. The varistor of 99.6 mol%-0.3 mol%Y2O3-0.1 nol%Ta2O5 composite sintered at 1400 °C has a maximal nonlinear coefficient of α =4.4, a low breakdown voltage of 10.8 V/mm, the ultrahigh electrical permittivity of 7.73× 104 and low tanδ of 0.34. The sintering temperature plays an important an important role on the nonlinear electrical characteristics and dielectric properties of the ceramics through its influences on the microstructure of samples.
J-Integral Analysis of Surface Cracks in Round Bars under Combined Loadings
Authors: Ismail Al Emran , Ariffin Ahmad Kamal , Abdullah Shahrum , Ghazali Mariyam Jameelah , Daud Ruslizam
Published: February 2011

This paper presents a non-linear numerical investigation of surface cracks in round bars under combined bending and torsion loadings by using ANSYS finite element analysis (FEA). Due to the non-symmetrical analysis, a full finite element (FE) model was constructed and special attention was given at the crack tip of the cracks. The surface cracks were characterized by the dimensionless crack aspect ratio, a/b = 0.6, 0.8, 1.0 and 1.2, while the dimensionless relative crack depth, a/D = 0.1, 0.2 and 0.3. The square-root singularity of stresses and strains was modeled by shifting the mid-point nodes to the quarter-point locations in the region around the crack front. The proposed model was validated with the existing model before any further analysis. The elastic-plastic analysis under the loading was assumed to follow the Ramberg-Osgood relation with strain hardening exponent, n = 5 and 10. J values were determined for all positions along the crack front and then, the limit load was predicted using the J values obtained from FEA through the reference stress method.
Antibacterial Activity of TiO2 and Fe3+ Doped TiO2 Nanoparticles Synthesized at Low Temperature
Authors: Boonyod Saowaluk , Sutthisripok Weerawan , Sikong Lek
Published: February 2011

Nanocrystalline TiO2 powder with and without Fe3+ doping were successfully synthesized at low temperature by a microwave-assisted sol–gel method. The synthesized TiO2 powders were characterized by XRD, BET, FT-IR and SEM. It was found that anatase phase was formed after refluxed at 80°C using a domestic microwave oven. Antibacterial behavior towards E. coli was then studied under UV and fluorescent irradiation. The synthesized pure TiO2 powder exhibited superior antibacterial activity under fluorescent irradiation compared to the commercial TiO2 (Degussa P25). It can efficiently destroy E. coli bacteria after 20 min with UV irradiation and 3 h with fluorescent light; this good activity is mainly related to the high OH radicals on its surface. It was also observed that the synthesized powders have smaller crystallite size and larger specific surface area than those of Degussa P25 due to the absence of high temperature calcination requirement.
Measurement of Residual Strain in Cold Spray Process Using X-Ray Diffraction and Finite Element Method
Authors: Phan Thanh Duoc , Masood Syed H. , Zahiri Saden H. , Jahedi Mahnaz Z.
Published: February 2011

Cold spray technology has the potential to be utilised in broader industrial applications especially for oxygen-sensitive materials such as titanium. In this paper, the effect of titanium cold spray coating on residual strain after deposition is evaluated. Ring-shaped sample of 16.5 mm diameter was directly fabricated from titanium powder by cold spray. Using an X-ray diffractometer (XRD) and finite element analysis (FEA), the coating surface was analysed and compared. The XRD measurements revealed that residual strain at the sample surface (εXRD) was around 0.140. There was also some X-ray peak broadening of steel, which may be related to presence of porosity in unpolished samples. In addition, a good correlation was found (εFEA ≈ 0.169) when the residual strain results obtained from FEA were compared with the conducting test outcomes. Therefore, finite element method can be considered as a cost effective tool in quantification of strain in cold spray titanium structure.
Cyclic Oxidation Behaviour of MoSi2 and MoSi2-Si3N4 Composites for Aircraft Gas Turbine Elements
Authors: Uzunonat Yagiz , Uzgur Sinem Cevik , Diltemiz S. Fehmi , Kushan Melih Cemal
Published: February 2011

Pest oxidation phenomena is the major drawback of MoSi2 for the applications of this material over gas turbine elements. Therefore, addition of Si3N4 does not only eliminate the structural disintegration behaviour which can only be observed between relatively low temperatures (673-873 K) but also improves the fracture toughness at elevated temperatures. In this study, after giving some significant properties of MoSi2, effect of processing conditions to microstructural morphology and oxidation characteristics at gas turbine operating temperatures will be discussed within a composit approach.
Thermal Characterization of Low Grade Wood Polyacylonitrile Composite
Authors: Kumar Manoj , Sah P.L. , Zaidi M.G.H. , Srivastav Anupam
Published: February 2011

A series of wood polyacrylonitrile (PAN) composites (WPCs) were synthesized through impregnation polymerization of Eucalyptus wood (Eucalyptus Grandies) by acrylonitrile (AN) in methanol (20-60% v/v) in the presence of benzoyl peroxide (1.0% w/v) in benzene medium at 70 ±10C. This resulted in corresponding WPCs with polyacrylonitrile (PAN) loading in the range of 15.5-20%. Loading of PAN into wood, as ascertained through TGA, DTGA and DTA and supported by Fourier Transform Infrared Spectroscopy (FTIR) as well as Scanning Electron Microscopy (SEM) was found to increase the resistance against thermo-oxidation of WPCs in comparison to untreated wood.
The Application of CAD Technology on the Design of Reinforced and Prestressed Counterforce Wall System
Authors: Wang De Ling , Shen Jiang Hai
Published: February 2011

The counterforce wall and pedestral is a complex system. Computer aided design technology is used to design and analyze this reinforced and prestressed concrete structure. Firstly CAD design program is used to design a representative wall section as a separate component. It helps doing ultimate limit state calculation and serviceability limit state checking computation. The prestress on concrete induced by prestressing steel according to construction method is also computed. Secondly, a finite element program is used to analyze the whole system. The prestress computed by CAD design program is regarded as external load. Simulation technology is also described in this paper. The stress, strain and deformation of the whole prestressed system are calculated and checked. Moreover, dynamic structural analysis is done by finite element program. Then vibration frequencies and modes can be obtained. By combining CAD design with finite element program, this complex system can be designed reasonably and effectively.
Preparation Conditions and Properties of Porous SiO2-Doped TiO2 Photocatalyst
Authors: Li Hong , Li Qian , Zhang Wen Jie
Published: February 2011

A porous SiO2-doped TiO2 photocatalyst was prepared through co-sol-gel method used for photocatalytic degradation of methyl orange. PEG1000 was used as a template. Photocatalytic degradation was conducted after adsorption equilibrium to identify the contribution of both adsorption and photocatalytic degradation. While PEG addition ranged from 0.25 g to 1.0 g, the optimum addition amount was at 0.5 g. The degradation rate increased with increasing calcination temperature in the range from 400 to 500 oC, and then it decreased with still increasing temperature. The photocatalyst calcinated at 500 oC for 4 h could degrade 29.2% of the initial methyl orange in 30 min. Nearly 96.5% of decoloration of the initial methyl orange was removed in 100 min under UV light irradiation with the existence of the porous SiO2-doped TiO2.
Characterizing of Natural Nanoclay/Polyethylene Nanocomposite during Processing Steps
Authors: El-Sheikhy Refat , Al-Shamrani Mosleh
Published: February 2011

Nanocomposite made of clay minerals and polyolefin goes through several steps. During these steps materials will have changes especially in the structure and properties. Then the final material will be of both new structure and properties. These main steps in the manufacturing process will include the stages of preparation of the material components and mixing. The structures of the materials are well characterized at each step. Then, we can understand how the processing steps will affect the structures and mechanism for producing the final nanocomposite material. The results include characterization by SEM, TEM, XRD and EDAX chemical analysis. During the processing, the energy will be changed for both of the initial materials and the final product in addition to the materials properties which will depend on the energy changes. The analysis includes the methods of calculations of energy changes. Then, design suggestions are developed for energy control to produce nanocomposite with certain energy level to carry certain amount of loads. Therefore, the study will provide possibility for pre-control of the lifetime of the produced materials.
Photocatalytic and Antibacterial Properties of TiO2 Composite Thin Films Coated on 304 Stainless Steel Substrate Synthesized at Low Temperature
Authors: Muangtrairat Natthapong , Rachpech Vishnu , Sikong Lek
Published: February 2011

This paper describes the photoactive and antibacterial properties of TiO2, Fe3+/TiO2 and N/TiO2 thin films on 304 stainless steel substrate that prepared by a sol-gel and dip coating methods. Anatase phase crystalline together with an amorphous phase was formed after refluxed at 100W for 2h using a domestic microwave oven followed by oven heating in low temperature range 100-250°C for 1 h. The adhesion between thin film and stainless steel substrate is strong and films thickness observed by SEM were about 700~1000 nm. FT-IR spectra of as-prepared TiO2 powders reveal hydroxyl radical on TiO2 surfaces, leading to promotion of photocatalytic reaction of the films. Photocatalytic activity was determined by means of degradation of methylene blue solution under UV irradiation and antibacterial efficiency was evaluated by inactivation of E.coli. The photocatalytic reaction rate can be expressed as an exponential equation. TiO2 and TiO2 composite thin films exhibited high photoactive and antibacterial properties under UV irradiation comparing to control. E.coli was killed about 80% and 95% during treatment with UV for 1 and 3 h, respectively.
A Method for Simulation of Microstructure Evolution in 980MPa-ULCB Steels during On-Line Heating Treatment
Authors: Zhang Jian Xin , Gao Ai Hua
Published: February 2011

Influence of the off line heating treatment parameter on the microstructure of a high strength steel plate was studied system previously. However, the information about the effect of on-line heating treatment process on ultra-high steel plate, especially on the plate with a tensile strength 980MPa or above, is limited due to the lack of effective method to simulation for the on-line heating treatment process. A method, which is preformed with a thermo-mechanical simulator, simulation the parameter of on-line heating treatment on the microstructure evolution a high strength ULCB steel plate after the accelerated cooling. By means of observation the original microstructure and microstructure morphologies varied with the parameter of the on-line heating treatment process, the present results demonstrate the microstructure characterizations before and after heating treatment process, while also the distribution of M(C, N) particles on lath boundaries or lath interior and the volume fraction and the average size of M/A island.
The Mean Projected Range and Range Straggling of Er Ions Implanted in Silicon-On-Insulator
Authors: Qin Xi Feng , Li Shuang , Wang Feng Xiang , Liang Yi
Published: February 2011

It is very important to consider the distribution of range, range straggling and lateral spread of ions implanted into semiconductor materials in design and fabrication of semiconductor integration devices by ion implantation. The mean projected ranges and range straggling for energetic 200 – 500 keV Er ions implanted in silicon-on-insulator (SOI) were measured by means of Rutherford backscattering followed by spectrum analysis. The measured values are compared with Monte Carlo code (SRIM2006) calculations. It has been found that the measured values of the mean projected range are good agreement with the SRIM calculated values; for the range straggling , the difference between the experiment data and the calculated results is much higher than that of .
Research on WFQ Algorithm Improvement of Wireless Sensor Network
Authors: Zhao Ni , Li Xun
Published: February 2011

It needs to consider about providing packet scheduling algorithm based on priority for different traffic in Wireless Sensor Network (WSN) to ensure enough low delay and enough low packet loss rate for high priority traffic and normal application of the network. Based on analysis on commonly used packet scheduling algorithm and considering about requirements of WSN on queue priority, the paper introduced delay parameter to represent network performance to distribution of WFQ scheduling weight so that network resource distribution adaptively adjust to current each queue, so as to obtain a kind of improved WFQ scheduling algorithm oriented to self-similar traffic. Based on provided formula and implementation flow of improved, simulation of improved was conducted in OPNET network environment. Simulation results show that the algorithm has good validity on the basis of inheriting not high complexity of WFQ algorithm.
Effect of Pressures on the Chemical Vapor Deposition of BN Using Borazine
Authors: Li Jun Sheng , Zhang Chang Rui , Li Bin , Cao Feng , Wang Si Qing
Published: February 2011

Boron nitride coatings have been prepared by chemical vapor deposition using borazine as single precursor at 900 °C. The effect of the total pressure on the surface morphologies of the coatings was investigated. For low total pressures (≤ 3 kPa), the deposits presents a compact pebble-like surface structure. However, when high total pressures (> 3 kPa) were used, the surface of the coatings presents a loose grain-like feature. When the total pressure increases up to 12 kPa, the coatings shows a porous surface structure. The composition and structure of the deposited coatings were investigated by means of FTIR and XRD analysis. It shows that the coatings have a structure of turbostratic boron nitride.
Quality Control Model for Manufacturing Process Based on GQMM
Authors: Yu Zhong Hua , Zhou Juan
Published: February 2011

A structured quality control model was proposed. It was a multilevel and knowledge-based quality control model which took Goal, Question, Metric, Measure and other fundamental elements as the main line, structured principle as guidance, manufacturing process as carrier, and improve quality of manufacturing system as destination. Firstly, a structured analysis principle was introduced. And then a structured quality control model was proposed combining bearing manufacturing process. A formal description of mappings between Goal-Question-Metric-Measure (GQMM) was also discussed. Finally; the architecture of the model was presented.
Reliability Prediction of Wireless Sensor Network Based on Neural Network
Authors: Sun Xuan Dong , Wang Xiao Jing
Published: February 2011

Reliability is one of key indexes of communication network system performance assessment, which is also main basis for network optimal design, network management and control. Based on definition of network node reliability and link reliability, the paper given description on Wireless Sensor Network (WSN) reliability assessment and presented a kind of WSN reliability prediction model and its learning algorithm of WSN based on RBF neural network. The method can accurately estimate network reliability according to reliability of network node and link under any topology of WSN. Simulation results show that the method is effective in the prediction of reliability of WSN.
Optical Transmission through Subwavelength Metallic Slit Arrays
Authors: Wang Ai Hua , Cai Jiu Ju , Chen Yu Bin
Published: February 2011

Mid-Infrared radiative property of submicron silver slit arrays have been numerically studied with the finite difference time domain method. The slit width varies from 50 nm to 300 nm and a square feature may attach at either or both slit sides. Although the side length of features is one or two orders of magnitude shorter than the wavelength, the attached nanoscale features can modify the transmittance significantly. The transmittance has also been furtherly investigated in detail by looking into electromagnetic fields and Poynting vectors of selected slit geometries. The investigation results show that such change can be attributed to the cavity resonance effect inside the slit arrays. The work is of great importance to the wavelength-selective devices design in optical devices and thermal applications field.
Electrical and Piezoelectric Studies of SrBi3.98Dy0.02Ti4O15
Authors: Sarah Pasala , Mamatha B.
Published: February 2011

SrBi3.98Dy0.02Ti4O15 (SBDT), a member of bismuth layer structure family, is prepared by solid state reaction method. XRD analysis shows the formation of single-phase compound with an orthorhombic structure. Complex impedance spectroscopy (CIS) and dielectric data are acquired from room temperature to 600°C over a wide range of frequencies. The results obtained from the impedance spectroscopy are analyzed, to understand the conductivity behavior of SBDT. Activation energies are evaluated from the data. The piezoelectric coupling factor, kp, is found to be 0.5.
Photocatalytic Activity of TiO2/Ti Film Prepared by Sol-Gel Method on Methyl Orange Degradation
Authors: Zhang Wen Jie , Yang Bo , Bai Jia Wei
Published: February 2011

TiO2 film was deposited on titanium substrate by a sol-gel dip-coating process. Photocatalytic activities of the films prepared with and without template were compared. The TiO2 film deposited on Ti substrate obviously could not adsorb methyl orange on its surface and the titanium substrate had very weak activity under UV light irradiation. The TiO2 films prepared without the addition of PEG1000 were calcinated at 450 oC, 500 oC, 550 oC, and 600 oC and the film calcinated at 500 oC showed the optimum photocatalytic degradation activity. The addition of PEG1000 could promote degradation of methyl orange that can be attributed to the possible pore forming in the TiO2 film.
Heat Storage Experiment of the Microencapsulated Phase Change Material Slurry in a Horizontal Rectangular Tank
Authors: Zhang Yan Lai , Rao Zhong Hao , Xie Jie Fei , Wang Shuang Feng
Published: February 2011

Heat storage experiment by natural convection in rectangular tanks heated from below has been conducted with fluidity slurry composed of microencapsulated phase change material (PCM). The slurry shows a peak value in the specific heat capacity with latent heat at the temperature of about T = 31 °C. The effects of the heating wall temperature TH, the PCM mass concentration Cm of the PCM slurry and the height H of the tank on heat storage are revealed, respectively.
The Analysis about Adult Sports Education Quality Certain Problem
Authors: Xu Wen Sheng , He Xiang Li
Published: February 2011

This article first discussed our country current adult sports education existence insufficiency, then has analyzed the adult sports education quality rating principle, finally studied has acted according to the adult sports education the characteristic solution existence question. Therefore this article has the profound theory significance and the widespread practical application.
Photocatalytic Degradation Mechanism and Kinetics of Caffeine in Aqueous Suspension of Nano-TiO2
Authors: Chuang Li Chin , Luo Chin Hsiang , Huang Sing Wei , Wu Yu Cheng , Huang Yi Chin
Published: February 2011

This study investigated TiO2 photocatalytic degradation of caffeine, a stimulating drug, in aqueous suspensions of titanium dioxide under a variety of conditions. Pure TiO2 powders were prepared using a modified homogeneous-precipitation process at low temperature (HPPLT) method. The degradation was studied by monitoring the intermediates employing high performance liquid chromatography (HPLC) separation coupled to an atmospheric pressure ionization mass spectrometry (API-MS) system operated under selected ion monitoring (SIM). These results indicate the original concentration of caffeine almost completely degraded within 360 min, and a degradation ratio of more than 50 % appearing within 120 min of irradiation in a pH range of 3—10. The reaction rates for the decomposition of caffeine in water are higher for runs at pH 3 (k = 0.013 min-1) and pH 11 (k = 0.012 min-1). The proposed conversion mechanism of caffeine was used. The caffeine was first oxidized to become dimethyl parabanic acid and further degraded to di(hydroxymethyl) parabanic acid. This study also detected the product from N-demthylation, theophyline.
Some Motion Models of Artificial Animals and Momentarily Continously Switching of the Models
Authors: Yang Guo Wei , Liu Wei
Published: February 2011

Some local motion models of artificial animals and a method momentarily continuously to switch the models are given. A society behaviour system of artificial fishes based on the way and method is exploited, which can exhibit life behaviours and intelligence of animals. How momentarily continuously to switch the motion models of animated agents in the system is better settled. The system can illimitably generalizedly circularly run and has good man-computer interaction. Moreover the appearance, motion and behaviour of the animals in the system are lifelike and convinced. There are not bad visions such as ‘mutation’, ‘suddenly disappearring’, ‘jumpiness’of animated agents.
New Matter Element System AND\OR Net Models and Relevant Extension Reasoning of Product Conceptual Design
Authors: Yang Guo Wei , Liu Wei
Published: February 2011

New matter element system AND\OR models of product conceptual design are respectively constructed based on the matter element system theory, which are convenient for computer representation. Rich relevant extension reasoning for product conceptual design is proposed. This paper argues that the matter element system AND\OR net model of production conceptual design not only has the ability to represent the object-oriented knowledge representation method but also has a relatively high ability to represent the process of conceptual design and innovative design. It is expected that the ICAD systems developed based on these models and reasoning can support product conceptual design.
Exponential Stability Estimate of Fully Nonlinear Aceive Equation by Boundary Control
Authors: Lu Dian Chen , Zhu Ruo Yu
Published: February 2011

The well-posed problem for the fully nonlinear Aceive diffusion and dispersion equation on the domain [0, 1] is investigated by using boundary control. The existence and uniqueness of the solutions with the help of the Banach fixed point theorem and the theory of operator semigroups are verified. By using some inequalities and integration by parts, the exponential stability of the fully nonlinear Aceive diffusion and dispersion equation with the designed boundary feedback is also proved.
Preparation and Characterization of Modified Bamboo-Charcoal by Ferric Sulfate Dipping and Microware Radiation
Authors: Li Fang Wen , Yue San Li , Ma Song Jiang , Yang Juan , Wu Nian Fen , Jia Hai Wu , Fu Mei Ling
Published: February 2011

Modified bamboo-charcoal (MBC) was prepared by Ferric sulfate dipping and microwave radiation with 20～30 mesh bamboo-charcoal (BC) pretreated by water boiling as the support. The original and modified BC were characterized by SEM, FTIR, XRD, BET and BJH. Fluoride removal from simulated drinking water containing fluoride was probed into with MBC. The results indicated that MBC took on minor average pore diameter (1.172nm), major microspores and greater specific surface area (99.891 m2/g). Loaded iron combined with BC by bonds from BC such as H-O-H bond, C-O bond and O-H bond. The increase of fluoride removal after BC being modified suggests that MBC is a more potential defluorinate agent.
The Cylinder Errors Calculation of Three Edges Isometric Polygonal Based on Particle Swarm Optimization Algorithm
Authors: Wang Zhan Kui , Chen Xi Qu , Zheng Yan Ling
Published: February 2011

An evaluation method of three edges isometric polygonal cylinder errors was proposed, and its minimum area model was built in the condition which there was no unity and maturity criteria and method for evaluating the isometric polygonal cylinder errors. an engineer experiment was done. The results indicated that the method and model can be used to evaluate three edges isometric polygonal cylinder errors. These works were done has certain practical value for promoting the practical application of isometric polygonal cylinder in engineer.
RBF NN-Based Block PD-Type Backstepping Control of Induction Motor
Authors: Li Hai Yan , Hu Yun An
Published: February 2011

For the model of induction motors(IMs) in field-oriented coordinates, a novel design method of controller is proposed, which combining block adaptive backstepping method with neural networks, introducing PD-type feedback, and making use of the diagonal feature of the unknown control matrix and the boundedness of its derivative. The control law and parameter updating law are derived using Lyapunov theory, which guarantees the stability of the whole system. The proposed approach can track the rotor speed and flux reference signals under parameter uncertainties. Simulation results show the effectiveness of the proposed approach.
Study on Performance Evaluation of Enterprise
Authors: Sun Wei
Published: February 2011

Performance evaluation of enterprise is a summary of corporate management and it is an important part of measures to improve efficiency. So, It is concerned by the business community, academia and government departments. This paper attempts to use fuzzy comprehensive evaluation method to do performance evaluation of enterprises. Based on theoretical analysis, the paper study the case. The conclusion is reasonable. So, the method is valuable and scientific.
Key Computer Technology of Precision Fruits in Suzhou City
Authors: Fang Li Gang , Li Jin Xiang , Gu Cai Dong , Li Hong Li
Published: February 2011

Precision fruits system is based on new tools and sources of information provided by modern technologies, such as the global positioning systems (GPS), remote sensing (RS), geographic information system (GIS) and variable-rate technologies. The modern technologies are integrated based on computer technology. The study introduced foreign and domestic situation of computer technology in precision fruits in detail. The key computer technology, such as the basic geographic databases and intelligent decision support system in precision fruits were analyzed, and the theory and practical application of spectral diagnosis of soil-leaf nutrient and online detecting model of microelement of fruits was emphasized in Suzhou city. The study shows that computer technology is one of the keys to establish high quality and efficiency, ecological, safety precision fruits farming techniques system of Suzhou city, and provides technical support for an increase in income of fruits farmer while decreasing in cost and pollution of fruits farming.
A General Traveler Agent Behaviour Model for Traffic Flow Simulation
Authors: Huang Ling , Wu Jian Ping
Published: February 2011

The modeling of traveler’s daily travel behaviour is a complex problem. We propose a general activity-based traveler agent behaviour model for microscopic traffic flow simulation, inspired by the ideas of activity-based traffic demand model, hierarchical structure in behaviours, agent approach and subjective utility optimization method. In the case study, the general model was applied to an unsignalized intersection mixed traffic flow simulation model, and the validation results were promising.
Design of Water Dissolved Oxygen Test System
Authors: Wang Ju Xiang , Wang Xiao , Wu Xin
Published: February 2011

The amount of the dissolved oxygen in the water is an important index for the fishery breeding. This design is intended to avoid the negligence in fishery breeding because farmers failed to increase the oxygen to the pond, which led to the death of fish, also discussed the influence of algae water pollution, temperature and water depth on the determination. The design using acidic gel electrolyte original battery coated in oxygen sensors as oxygen sensor，AT89S52 SCM system as the oxygen determination and control system, SCM control relay to control the opened and closed of aerator. To improve the accuracy of oxygen collection, this design uses three oxygen sensor at different positions turns sequential sampling in the pond, by the A/D converter into SCM and corresponding control signal. If the average value of oxygen content in the pool below the lowest oxygen resistance of fish aerator would be opened, to ensure the lowest oxygen content so that fish will avoid death. Avoid the economic losses caused by the fish death as farmers fail to open aerator timely, that because of the low oxygen content cause by the sudden changes of light, temperature, pressure and so on. At the same time the design will always show the oxygen content at all times, so that oxygen contents can be adjusted according to the numerical value in the pond, to achieve optimal oxygen content and improve the standard of fish feed conversion rate and growth rate.
Design and Application of Geomagnetic Dynamic Simulator
Authors: Yang Jin Xian
Published: February 2011

A geomagnetic dynamic simulator was designed, and attitude simulation application method was proposed. Three pairs of square Helmholtz coil system was designed, and the geomagnetic field was cancelled by DC current, forming a zero magnetic field space and generating controlled size and direction magnetic field. Three DC current sources were adopted to produce the current for canceling geomagnetic field and the desired magnetic field. The geomagnetic field was offset without three DC power, the premise of saving cost and ensure the accuracy. As the magnetometer accuracy and dynamic capability does not take into account two indicators, so calibration mode, select high-precision magnetometer, or for remanence measurements. The selection of simulation in the dynamic simulation using magnetometers can meet the small satellite in orbit simulation requirements.
The Analytic Measure of Human Head SAR Computed by 3-D Impedance
Authors: Yue Man Zhi , Lu Zhi Yuan , Wei Qing Qing , He Man Man
Published: February 2011

Introduce the theory and application of the Impedance Method and set up the model of fictitious human. After dividing the human head into many cube griddings, every gridding edge could be thought of the impedance based on the head. The current in one section of the loop could be confirmed by the line impedance, which based on the permittivity and electric characters of the matter which is covered by the gridding. Using C++ computing and picturing the datum by Matlab, 3-Dimension SAR of each lay would be found. After comparing with the results of FDTD, the Impedance Method is more easy, more perspicuity, more quick and don’t need consider the strict boundary.
The Study on the Relationship between Hypercompetition and Organizational Innovation: The Role of Organizational Learning
Authors: Shang Hang Biao , Tian Guo Shuang , Song Cai Ping , Cao Yu Kun , Chen Li Rong , Chen Xiang Hua , Li Ying
Published: February 2011

This paper studies on the formation mechanism of how organizational innovation is established and developed. We built a model including envirnomental change, organizational learning and organizational innovation. Using the empirical study as a sample of 194 enterprises the results of this paper show that (1) the external environment factors have no direct effent on organizational innovation. The main factor of organizational innovation driven is organizational learning. (2) the industry of environmental change on the organizational learning have a significant impact to organizational learning and changes in the macroeconomic environment had no significant effect to organizational learning.
Research and Development for Cable Industry-Oriented Manufacturing Process Information System Based on Rough Set Theory
Authors: Bin Li
Published: February 2011

The characters of the Manufacturing Process Information System (MPIS) for industry-oriented are included here. The characters of the process and the difficulty faced for cable industry are summarized. Then, A model structure of MPIS for cable industry is established. A method based on Rough Set Theory for processing plan knowledge system is put forward. An example for processing knowledge finding is studied at last.
Optimized Design of Permanent Magnetic Stage Based on Simplex Method
Authors: Zhang Yi , Tang Dong Hong , Sun Hui Zhi
Published: February 2011

Because the thrust and suspend stability is related to sine level of air gap magnetic field, so the sine level of air gap magnetic field is the point of it’s operational factors, proposed a optimization function of magnetic field based on the simplex method, and the optimization design of the stage is established. The main magnetic parameter is assured, and step response is attached, the result is expressed that the magnetic stage is finished the nm position requirements.
A Human-Attention Driven Video Capture Method for Wearable Visual Computing
Authors: Han Lu , Xue Fang Zheng , Li Zu Shu , Chen Dong Yi
Published: February 2011

In this paper, we propose a human-attention driven video capture method for wearable visual computing. This method could help wearable vision system to avoid collecting a lot of meaningless visual images and save the platform resources. We firstly calculate background similarity and recognize user’s attention behavior, then detect user’s active or passive attention status, finally automatically and selectively capture video information according to user’s attention interest. We describe architecture of proposed method and give an experiment to validate its feasible.
Prediction of the Plastic Fracture Mechanical Properties on Metallurgical Composite Bimetallic Tube with Axial Crack
Authors: Zheng Li Yun , Li Chun Qiang , Wang Li Hui , Song Ya Feng
Published: February 2011

Based on the finite element analysis software ABAQUS, the CT specimens of bimetallic material and the metallurgical composite bimetallic pressure tube with axial crack were simulated on the fracture mechanical properties, after that the crack growth residual strength and the plastic failure stress of the metallurgical composite bimetallic pressure tube model were obtained. The results indicate that the crack growth residual strength generates near the crack tip and the crack growth residual strength of the pressure tube model is smaller than the CT specimens. Meanwhile, the plastic failure stress values obtained from the CT specimens and the pressure tube model are basically consistent with the theoretical calculative values. With the crack depth a increasing, the plastic failure stress values will be reduced. For the same crack depth, the plastic failure stress values of the pressure tube model are slightly lower than the CT specimens and the theoretical calculative values.
Study on Forecasting of Gold Price Based on Varying-Coefficient Regression Model
Authors: Zhang Qi , Ma Jun Hai , Wang Yan
Published: February 2011

U.S. dollar index, oil prices, silver prices, DOW index, OECD leading index and the CRB index are selected and varying-coefficient regression model which has dynamic response to the various variables influence is applied to predict the gold price and improve the prediction accuracy in this paper. In addition, the weighted least squares is adopted as an estimation of the parameters, corrects the traditional least squares method defect which assumes the sample data weights equal points to the prediction, making sample weights larger closer with prediction points. In the choice of weighting function, the paper uses cross validation to gain smoothing parameter. In the last, we predicted the 12 months gold prices from January 2010 December 2010 applies varying-coefficient regression model.
Robust Trajectory Tracking Control of Autonomous Quad-Rotor UAV Based on Double Loop Frame
Authors: Hou Zhi Cheng , Gong X. , Bai Y. , Tian Y.T. , Sun Q.
Published: February 2011

This paper deals with the under-actuated characteristic of a quad-rotor unmanned aerial vehicle (UAV). By designing the double loop configuration, the autonomous trajectory tracking is realized. The model uncertainty, external disturbance and the senor noise are also taken into consideration. Then the controller is put forward in the inner loop. An optimal stability augmentation control (SAC) method is used to stabilize the horizon position and keep it away from oscillation. By calculating the nonlinear decouple map, control quantity is converted to the speeds of the four rotors. At last some simulation results and the prototype implementation prove that the control method is effective.
A Real-Time Traffic Information Model Using GPS-Based Probe Car Data
Authors: Chen Wan Jia , Chen Chi Hua , Lin Bon Yeh , Lo Chi Chun
Published: February 2011

In recent year, the rise of economic growth and technology advance leads to improve the quality of service of traditional transport system. Intelligent Transportation System (ITS) has become more and more popular. At present, the collection of real-time traffic information is executed in two ways: (1) Stationary Vehicle Detectors (VD) and (2) Global Position System (GPS)-based probe cars reporting. However, VD devices need a large sum of money to build and maintain. Therefore, we propose the linear regression model to infer the equation between vehicle speed and traffic flow. The traffic flow can be estimated from the speed which is obtained from GPS-based probe cars. In experiments, the Speed Error Ratio (SER) and Flow Error Ratio (FER) of linear regression model are 4.60% and 24.63% respectively. The estimated speed and traffic flow by using linear regression model is better than by using linear model, power law model, exponential model, and normal distribution model. Therefore, the linear regression model can be used to estimate traffic information for ITS.
Control for Nonlinear Chemical System
Authors: Wu Shu Jing , Wang Da Zhong , Okubo Shigenori
Published: February 2011

In this paper, we propose a new design of the feedback control of state vector for the plants with polynomial dynamics. A genetic algorithm is employed to find suitable gain, and algebraic geometric concept is used to simplify the design. Finally, an example is given to illustrate the effectiveness of the proposed method.
Design of the Model Following Control System for Robot Control System
Authors: Wang Da Zhong , Wu Shu Jing , Cheng Wu Shan , Zhang Min Liang
Published: February 2011

We propose a new study of the robot control by using model following control system (MFCS). With the MFCS method [1-5], we obtain a simple input control law. The bounded property of the internal states for the control is given and the utility of this control design is guaranteed. In this paper, MFCS control techniques are applied to robot control problem, and simulations are given to illustrate the effectiveness of the proposed method.
A Design of the MFCS with Time-Delay
Authors: Wang Da Zhong , Wu Shu Jing , He Fa Jiang
Published: February 2011

We propose a design of model following control system (MFCS) with time-delays. The bounded property of the internal states for the control is given and the utility of this control design is guaranteed. It is confirmed on basis of numerical examples that the output signal of the control system asymptotically follows the reference signal in the case of the existence of disturbances.
Influence of Temperature and the BZ Substrate on Aggregation-Disaggregation Self-Oscillation of a Polymer Chain
Authors: Hara Yusuke , Jahan Rumana A.
Published: February 2011

We synthesized a self-oscillating polymer chain with a negatively charged moiety. The polymer chain caused the aggregation-disaggregation self-oscillation under the constant temperature induced by the Belousov-Zhabotinsky (BZ) reaction. In this study, we investigated the influence of temperature and the concentration of sodium bromate on the aggregation-disaggregation self-oscillation of the polymer solution (1.0 wt%) in a strongly acidic condition. As a consequence, we clarified that the life-time of the self-oscillation increased with decrease in the concentration of sodium bromate. On the other hand, the lifetime of the self-oscillation decreased with increase in temperature. In high temperature condition (48 and 60 °C), the amplitude of the self-oscillation was significantly inhomogeneous. Moreover, the frequency of the self-oscillation increased with increasing temperature. On the other hand, the frequency decreased with increase in the concentration of sodium bromate. This tendency was opposite to that in the acid-free condition and the 2.0 wt% AMPS-containing polymer solution.
Research on Moving Vehicle Detection and Tracking Algorithm Based on Video Image
Authors: Fu Xin Sha , Zhu Juan
Published: February 2011

Based on the computer vision technology and the digital image processing technology, the video moving vehicle detection and tracking algorithm is made to be on research; with the base of each characters of the background difference method and the inter-frame difference method, a revised comprehensive difference method is used, and combined with the special traffic video background, a background updating method revised from Surrender Algorithm is proposed. The moving object tracking algorithm based on matching matrix is explained to focus on the problem of failure of tracking moving objects when each of them are kept out. The application of software demonstrates that the method cited in this paper proves to be right and feasible and meet the need of highway operation monitor.
Neural Networks L2-Gain Controller Design for Nonlinear System
Authors: Liu Dan , Wang Ni Hong , Li Gui Ying
Published: February 2011

This paper proposes a new method that it uses the neural network to construct the solution of the Hamiltion-Jacobi inequality (HJ), and it carries on the optimization of the neural network weight using the genetic algorithm. This method causes the Lyapunov function to satisfy the HJ, avoides solving the HJ parital differential inequality, and overcomes the difficulty which the HJ parital differential inequality analysis. Beside this, it proposes a design method of a nonlinear state feedback L2-gain disturbance rejection controller based on HJ, and introduces general structure of L2-gain disturbance rejection controller in the form of neural network. The simulation demonstrates the design of controller is feasible and the closed-loop system ensures a finite gain between the disturbance and the output.