bluuebunny/crossref_metadata_2025 huggingface dataset:
The Risk Assessment and Control Technology to Engineering Schedule
Authors: Wang Xiao Yan , Liang Ting , Fan Shao Yan
Published: March 2011

The progress of construction projects in the plan are generally based on engineering theory and construction developed on the basis of experience. In addition, The schedule impact on the political and economic situation, resources, technology development and other factors. So progress has a great uncertainty. Once the delay period to the owner and construction unit will be a great deal of risk, so risk control of the progress it is essential. This article describes the uncertainty factors about affect on schedule and progress against these uncertainties should be how to control and progress of risk response.
UV-Curable Organic-Inorganic Hybrid Films Based on Epoxynorbornene Linseed Oils
Authors: He Jian Yun , Xiong Jin Ping , Xia Bing Qian
Published: March 2011

Epoxynorbornene linseed oil (ENLO) is a new kind of epoxide from renewable sources. An UV-curable organic/inorganic hybrid films using epoxynorbornene linseed oils (ENLO) and surface treated nano-silica were formulated. The mechanical properties，thermal properties and coating properties of the ENLO /silica coatings were evaluated as the function of nano-silica content. The results indicated that after incorporating the nano-silica, the strength, modulus and glass transition temperature of the hybrid films enhanced, while the elongation at break decreased. The nano-silica also improved the hybrid coating properties such as pencil hardness, solvent resistance and surface wetting properties. The morphology observation of the films by atomic force microscopy (AFM) showed that the average silica particle size was ~ 70 nm and the particles were well-dispersed in the organic phase.
Numerical Simulation Technology for a Full Cycle of Steel Line Pipe Manufacturing Operations
Authors: Aleshin Vladimir , Kobyakov Viacheslav , Seleznev Vadim
Published: March 2011

At present day pipe mill engineers have to deal with challenging technological problems of heavy-wall and high strength line pipe manufacturing. Numerical analysis of welded large-diameter pipe manufacturing stages is the most efficient way to solve these problems. Corresponding computational technologies and applied software was developed at Physical & Technical Center. Numerical structural analysis of steel plates at various stages of line pipe manufacturing is performed by the finite element method accounting for geometric and material nonlinearities. The only thing to be done by the engineer in such analysis is to specify required input parameters. All the further process is software-controlled. The discrepancy between the numerical analysis results and measured data in the overwhelming majority cases did not exceed 1%.
Flexible and Vibration Characteristics Simulation for the Large Megawatt Size Wind Turbine Blades
Authors: Wang Xu Dong , Wang Li Cun , Zhang Xian Ming , Feng Jun
Published: March 2011

In the development of new large megawatt size wind turbines, aerodynamic and structural reserch is interesting and important for study wind turbine performace and boost the development of wind power. In this paper, the aerodynamic and aeroelastic characteristic of blades is investigated and presented based on Blade Element Momentum and Hamilton theory. Then the flexible characteristics of balde is researched with the aerodynamic and aeroelastic model of the rotor. The flapwise and edgewise displacements, velocities and accelerations of blade tip are simulated and plotted to validate the model which is presented in this paper. The results have very important significance to investigate the vibration and fatigue lifetime of the wind turbine blades.
A Fuzzy Temporal System and its Characteristic Set Representation
Authors: Hu Guang Peng , Huang Hai Yang
Published: March 2011

The probability that the starting points or ending points of time intervals of two random events are equal is zero. Hence, in order to improve the efficiency of temporal reasoning, We introduced Heisenberg’s uncertainty principle to delete the fifteen basic temporal relations that the probabilities they happen were zero from INDU temporal system. The other ten basic temporal relations that the probabilities they happen were greater than zero were reserved. We used the characteristic sets to represent the ten basic temporal relations and got a fuzzy temporal system--UINDU. We gave the composition table of UINDU. It simplified INDU greatly. The experiments showed that the efficiency of UINDU was better than INDU.
Multinodal Load Forecasting in Power Electric Systems Using a Neural Network with Radial Basis Function
Authors: Bonato Altran Alessandra , Minussi Carlos Roberto , Marthins Lopes Mara Lúcia , Chavarette Fábio Roverto , Peruzzi Nelson José
Published: March 2011

In this paper we present the results of the use of a methodology for multinodal load forecasting through an artificial neural network-type Multilayer Perceptron, making use of radial basis functions as activation function and the Backpropagation algorithm, as an algorithm to train the network. This methodology allows you to make the prediction at various points in power system, considering different types of consumers (residential, commercial, industrial) of the electric grid, is applied to the problem short-term electric load forecasting (24 hours ahead). We use a database (Centralised Dataset - CDS) provided by the Electricity Commission de New Zealand to this work.
The Research on Image Segmentation for Fingerprint Identification
Authors: Xu Xiao Jie , Dong Xi Yan
Published: March 2011

As the precondition of fingerprint identification, the effective image segmentation plays the significant role in the following image processing. Unlike other images, the fingerprint images are obviously directional. Aiming at this feature, in this paper, an image segmentation method based on the directional information of fingerprint image is introduced, which sufficiently utilizes the directional information of fingerprint image and succeeds in separating the background information. However, owing to the absence of directional information in some local areas of fingerprint image, this method will produce large segmentation errors, even fail. Therefore, for these local regions without directional information, it is proposed to apply Bayesian decision-making theory based on minimum error probability to realize image segmentation. On the assumption that the gray values accord with the probability distribution of Gaussian finite mixture model in image feature space, EM algorithm is used to estimate the parameters of mixture model. The mixture application of two methods can effectively separate the background information from fingerprint image while saving the preprocessing time and ensuring the following identification accuracy of fingerprint. The experiments illustrate the feasibility of the hybrid approach.
Optimization Research on Structure Improvement of Stirring System for Preparation of Recycled Glass / Aluminum Matrix Composites with Stirring Casting Technique
Authors: Yao Gui Ni , Sun Ke Wei , Zhang Bei Gang , Zhao Hua Yang
Published: March 2011

this subject is to use recycled glass and recycled aluminum to prepare glass / aluminum matrix composites with stirring casting technique, and stirring tank is self-researched and developed. When determining stirring tank structure, it adopts Fluent to simulate the flow field for the factors (distance from upper paddles to liquid level, stirring paddle arranging angle and paddle interval) influencing internal structure, make the optimization research on the influence of these three factors to stirring effect, compare with the actual experiment results, and propose the resolutions to improve equipment structure.
Analysis of the Research Management System Based on Web Technology
Authors: Song Lian Gong , Qi Li Xia
Published: March 2011

Research information is an important work in research management of college, and involves abundant information in content and range. This article describes the overall design framework, design ideas as well as function modules of a Research Management Information System. The system not only greatly reduce the workload and improve efficiency of research management, but also would provide a large number of detailed historical data in management decisions.
Novolak Type Phenol Formaldehyde Resin from Waste Brown-Rotted Wood
Authors: Li Gai Yun , Qin Te Fu
Published: March 2011

The waste brown-rotted wood was liquefied in phenol with phosphoric acid as a catalyst and the resulting liquefied products were condensed with formaldehyde to yield novolak liquefied wood-based phenol formaldehyde resin (LWF). The results showed that brown-rotted wood could be almost completely liquefied within 0.5 h at phenol to wood (P/W) ratio 2. An increase in P/W ratio from 2 to 3 slightly improved the flow property of LWF, but accompanied by decreasing the product yield from approximately 140 to 120 %. The increase of liquefaction time from 30 min to 60 min did not have a significant influence on the resulting LWF. The thermofluidity of LWF were compared to that of the commercial novolak PF resin, and could be used to make moldings with similar thermal property and mechanical properties to those obtained from the conventional novolak PF resin.
An Empirical Study of the Relationships between Information Systems Strategy and Firm Performance
Authors: Hu Bao Liang
Published: March 2011

This paper examines the relationship between the information systems(IS) strategy and firm performance. It discovers the relationship between each dimension of IS strategy and firm performance, that is, business action support dimension, business decision support dimension and network embeddedness support dimension all show significant positive effect on firm performance. On the other hand, it discovers the different effect of the different IS strategy dimensions working on the firm performance. That is, business action support dimension has the significant positive effect not only on the process performance but also on the outcome performance. Business decision support dimension only has the significant positive effect on the process performance but not on the outcome performance. Network embeddedness support dimension just has the significant positive effect on the outcome performance but not on the process performance.
Surface Flashover Performance of Ion-Exchanged Machinable Glass Ceramics Material in Vacuum
Authors: Zhai Peng , Ma Xin Pei , Zheng Nan
Published: March 2011

Under the high electric field, discharge sometimes occurs along the surface of solid in vacuum, gas or liquid dielectrics, which is called surface flashover.SiO2-B2O3-K2O-Li2O-Al2O3-ZnO-MgO-F system glass ceramics has great machinability and excellent dielectronic property.This paper tries to study different time of ion-exchanged samples and their microstructures，which affect surface flashover performance of this novel material under the systerm of high voltage in vacuum. Compared to traditional coating method on alumina ceramic, the ion exchange treatment on glass ceramic can produce a tremendous improvement of flashover characteristics. The results show that the 10 hours ion-exchanged glass ceramic enjoys the most prominent insulation strength.Based on the theory of SEEA (Secondary Electron Emission Avalanche), these phenomena can be reasonably explained by the charge carrier injection and transport behaviors.
A Platform for Applications in Wireless Body Area Sensor Networks
Authors: Geng Dao Qu , Zhao Zhan , Fang Zhen , Xuan Yun Dong , Shi Yao Hong
Published: March 2011

In recent years wireless body area sensor networks (WBASN) has gained a lot of attention from researchers for its promising application in medical care and health care field. However, previous studies are typically involved in the deployment and performance of WBASN, and most research has barely considered the details of the hardware and software platforms. Furthermore, few existing platforms can meet the need of the practical application for their larger physical size, higher power consumption, etc. In this paper, a hardware-software platform (HSPF) is presented, which is especially designed for the application in WBASN. HSPF provides a “core” of the WBASN solution, which puts the most required hardware and software in a small package (24.8×19.0 mm). We discuss how the hardware components are selected to achieve the design goals: low power consumption and small size. Meanwhile, the current consumption of the hardware module of HSPF is evaluated. In addition, the architecture of the software module of HSPF and the design of the integrated star network transport (SNT) protocol are detailedly described. HSPF has been successfully used in our recent research project.
The Calculation of Unit Water Use in Recycled Concrete
Authors: Liu Xiang Hui , Liu Zhi Lin , Zhang Xue Bing
Published: March 2011

Recycled concrete research is one of the hot points at home and abroad currently. Whether the recycled concrete can be used in construction or not depends on its strength. Mixture ratio is an important factor deciding strength, while in which, the water cement ratio is one crucial parameter. So the calculation of unit water use in recycled concrete becomes an important research topic. The form of mixed coarse aggregate adding natural sand has already been studied by authors, the calculating formula for increasing water use has been put forward, but the calculation in other else case of aggregate combination form is not discussed. In this paper, the calculation for unit water use in recycled concrete in this case is discussed in detail, which can be used as a reference for designing the recycled concrete mixture ratio.
UV-Curable Coating of Epoxy-Acrylate/Polyurethane-Acrylate Nanocomposites Modified with V-POSS
Authors: Gao Jun Gang , Ma Ying Ying , Lin Hao Jie
Published: March 2011

UV-curable bi-component coating of epoxy-acrylate/polyurethane-acrylate modified with polyhedral oligomeric silsesquioxane containing vinyl group (V-POSS), and UV-cured process and kinetics were investigated by FTIR, DSC, and DMA. The results show that this coating has a good UV-curable property, and the two components have very good compatibility and can co-cure in free radical polymerization. The curing reaction can be described by a two-parameter autocatalytic Šesták-Berggren (S-B) model. The modified UV-curable coating has good adhesive strength for steel and hardness. The mechanical loss peak temperature Tp is highest when the content of V-POSS is 60%, which is increased by 5.2 oC than the pure system.
Systhesis, Curing and Thermal Propertied of Boron-Containing o-Cresol-Formaldehyde Resin
Authors: Gao Jun Gang , Lin Hao Jie , Ma Ying Ying
Published: March 2011

The boron-containing o-cresol-formaldehyde resin (BoCFR) with different amounts of boron was synthesized from o-cresol, boric acid and formaldehyde solution. The curing process of resin was by characterized by FTIR. The thermal properties and dynamic mechanical properties of resin were investigated. The results show that the borate has formed. The BoCFR has a better thermal stablitity. The residual rate of BoCFR is 30-40 % at 900 oC, which is higher about 400 oC than ordinary o-cresol-formaldehyde resin (o-CFR). The maximal mechanical loss temperature (Tp) is higher 30-38 oC than o-CFR. The weight loss of BoCFR can be main divided two stages. The main thermal degradation reaction follows first order kinetics.
Load Stress Analysis of Airport Pavement Based on Multi-Structural System
Authors: Wu Zi Yan , Guan Jin Fang , Lu Zhi Qiang , Liu Jian Min
Published: March 2011

The mechanical response of airport pavement under multiple-gear of the new large aircraft loadings behaves differently from traditional mechanical response problems. In this paper, a 3-D finite element model of nine 5m×5m full size slabs rigid airport pavement with load transfer of joints and multilayer base system is established, using the finite element method. With the example of airplane A380, we analyzed the Von Mises stress distribution when the large aircraft loadings act on different locations of the pavement slabs. The result shows that the critical of Von Mises stress does not occur at the slab edge but closer to the center of the loading area in the edge load cases; in addition, through setting different parameters of joint load transfer stiffness, the relationship between the joints stiffness and the load transfer efficiency of adjacent slabs is found. It is demonstrated that for higher joint stiffness there is higher transfer efficiency.
Hierarchical Partition Approach with Application on Enterprise Credit Assessment
Authors: Xia Fei Fei , Zhou Qi Feng
Published: March 2011

A new SVM (Support Vector Machine) classifier-combination model, based on Hierarchical Partition approach, for enterprise credit assessment is proposed in this paper. Enterprise credit assessment is essentially an ordinal classification (or ranking), and the popular multi-classification technique does not deal with the ordinal information in the sample data. Hierarchical Partition approach makes use of the ordinal characteristics to simplify the structure of classifiers, as well as to decrease the training and testing time. It can also be used to solve the problems where the imbalance sample distribution and different loss-costs among different ranks present. Experimental results show that the generalization ability of the new model using Hierarchical Partition approach are better than that of neural network model and traditional 1-vs-1 combined SVM model.
Effects of Heat Treatment on the Magnetic Properties and Dimension Accuracy of Fe-12%Al Soft-Magnetism Alloy
Authors: Sun Jun Yan , Tang Jian Ming
Published: March 2011

Theoretical analysis and experiment all show that heat stress has effect on the accuracy of Fe-12%Al soft-magnetism alloy’s dimension after heat treatment and also heat treatment process has effect on magnetic property and also the stress caused by machining has effect on magnetic property. A kind of new method is proposed to improve the magnetic property and accuracy of dimension of soft-magnetism alloy after heat treatment, in which the first step is to perform half-finish machining on soft-magnetism alloy material and leave a one-side margin 0.05mm, and the second step is to perform heat treatment and then finish machining during which some degree of tolerance margin is required to be set if the requirement of magnetic property is satisfied and last step is to the renewing magnetism treatment. This method can guarantee the high accuracy of soft magnetism alloy’s dimension as well as can renew the lost of magnetic property by 75%-91% which will improve the passing rate by almost double.
An Agent-Based Dialog System for Adaptive and Multimodal Interface: A Case Study
Authors: Taghezout Noria
Published: March 2011

Graphical Interfaces using an agent-based dialog can handle errors and interruptions, and dynamically adapts to the current context and situation, the needs of the task performed, and the user model. This is especially true for the design of multimodal interfaces, where interaction designers need to physically explore and prototype new interaction modalities and therefore require development environments that especially support the interactivity and the dynamic of this creative development process. We argue that, in the domain of sophisticated human-machine interfaces, we can make use of the increasing tendency to design such interfaces as independent agents that themselves engage in an interactive dialogue (both graphical and linguistic) with their users. This paper focuses on the implementation of a flexible and robust dialogue system which integrates emotions and other influencing parameters in the dialogue flow. In order to achieve a higher degree of adaptability and multimodality, we present Spoken Language Dialogue System (SLDS) architecture. The manufacturing process of the oil plant (GLZ: Gas Liquefying Zone), is selected as an application domain in this study
Research on the Micro-Crack Density of a Chromium Coating/Steel Substrate with and without Laser Pre-Quenching Treatment
Authors: Yang Ban Quan , Chen Guang Nan , Chen Xue Jun
Published: March 2011

The initial micro-crack density of a chromium coating/steel substrate with and without laser pre-quenching treatment was investigated in this work. It was found the micro-crack density of Cr coating on the pre-quenched substrate surface was much lower than that of the Cr coating on the original substrate surface. Based on the results presented in this work and in the literature, the find presented in this work indicates the lower crack density of the chromium coating on the pre-quenched substrate may improve the mechanical properties of this material system, and it may be an important mechanism responsible for the prolonged lives of workpieces in practice.
Microstructure Development and Properties of HSS-Based Self-Lubrication Composites
Authors: Wang Yan Jun , Wang Bin , Yang Li Ying , Wang Shou Ren
Published: March 2011

High speed steel based ceramic preforms with three-dimensionally interpenetrated micropores were fabricated using the mixture of TiH2, CaCO3 and stearic acid as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preforms with Pb-Sn based solid lubricants to create almost fully dense self-lubrication composites. The microstructure and properties of HSS-based self-lubrication composites were investigated as a function of sintered porosity. A quantitative analysis of microstructure was correlated with crushing strength，microhardness and wear rate to understand the influence of pore size, shape and distribution on mechanical and tribological behavior. Crushing strength and microhardness decreased with an increase in porosity. Meanwhile the decrease in microhardness with increasing porosity was slightly. The friction coefficient of HSS-based self-lubrication composites decreased with increasing the volume fraction of lubricant due to the self-lubrication and unique micropore structure. Within the range of lubricant volume fraction from 0% to 14%, the wear rate of the composites decreased steadily with the increase of lubricant content in the composites. Micropore structure and lubricant volume fraction play an important role in determining wear resistance of the composites whereas the measured bulk properties seem to be of minor importance.
Research on the Capability and Application of Flame Retardant Cable
Authors: Wang Yong
Published: March 2011

This paper, analyzes some parameters with the help of Cone Calorimeter (CONE) for the time to ignition, smoke extinction area, heat release rate, carbon monoxide yield and mass loss rate. The results show that the fire retardant agents affect KVV’s flame retardant property. Such as TTI ( time to ignition ) is prolonged to nearly two times, and the average HRR ( heat release rate ) reduces about 18% compared with the ordinary one and the maximum HRR down about 33%of its counterpart.
Preparation and Dielectric Properties of Polyimide Nanocomposite Films Based on Hollow Silica
Authors: Li Yu , Zhang Yi He , Shen Bo , Lv Feng Zhu
Published: March 2011

The hollow silica was fabricated by using monodispersed polystyrene microspheres as core template and tetraethyl orthosilicate as silica source, and polyimide nanocomposite films with different hollow silica concentration were successfully prepared via in situ polymerization. The hollow silica and nanocomposite films were characterized. The results indicated that the diameter of the hollow silica is around 30nm and the dielectric constant of the nanocomposite films enhance with the increase of the concentration of the hollow silica.
Suitability Evaluation of Four Thermal Insulation Solutions in Hot Summer and Cold Winter Zone in China
Authors: Hua Xin Ruo , Shen Xiao Mei
Published: March 2011

It is significant to scientifically evaluate the thermal insulation solutions used in building envelope. Considering four solutions, a regional suitability evaluation model is established by analyzing some factors such as technology, construction and economy. The evaluation model is based on the analytic hierarchy process, and the weights of performance indices are acquired from Delphi techniques. Combining the qualitative and quantitative analysis, some problems can be found out in the practical application of the solutions. The proposed suitability evaluation model can give scientific evaluation for the application and development of the energy-saving wall materials in hot summer and cold winter zone in China.
Effect of Carbon Addition on the Microstructure and Mechanical Properties of the In Situ Formed TiAl/Ti2AlC Composites
Authors: Zhu Jian Feng , Yang Wen Wen , Gong Yi Ping
Published: March 2011

TiAl/Ti2AlC composites were successfully fabricated by hot-press-assisted reactive synthesis method from elemental powder mixtures of Ti, Al and C. The effect of C addition on the microstructures and mechanical properties of TiAl/Ti2AlC composites was investigated in detail. The results show that the Rockwell hardness, flexural strength and fracture toughness of the composites are modified by incorporation of in situ formed Ti2AlC. When the C content was 0.44 wt %, the flexural strength and the fracture toughness reach the maximum values of 658.7 MPa and 10.03 MPa•m1/2, respectively. The reinforcing mechanism was also discussed.
Preparation and Characterization of High-k Copper-Phthalocyanine/Polyimide Composites with Outstanding Thermal Stability
Authors: Shang Ji Wu , Zhang Yi He , Li Yu , Lv Feng Zhu
Published: March 2011

Materials used for microelectronic devices need to have more multifunctional properties, such as excellent mechanical, thermal, and dielectric properties at the same time. In this paper, copper phthalocyanine/polyimide (CuPc/PI) composite films with high dielectric permittivity (k=9.9 with the volume fraction of CuPc is 28% at 100Hz) and high thermal stability are prepared by an in-situ polymerization process. The composite films show good dielectric properties and is almost independent of frequency in the measured frequency range up to 104 Hz. Notablely, The composites remain stable until the temperature reaches 500oC. In addition, the inclusion of CuPc slow down the composite degradation rate when the temperature is higher than 550oC. The resultant high performance of such polymer composites makes them attractive for technological applications in flexible high-k components.
Calculation Method of the Horizontal Displacement on the Multi-Grid Composite Wall-Shear Wall Structure
Authors: Yuan Quan , Guo Meng , Li Peng Fei , Yao Qian Feng
Published: March 2011

The multi-grid composite wall-shear wall structure (the hybrid structure discussed in this paper) is a new dual structural system consisting of the multi-grid composite walls and the RC shear walls. Because of the shear deformation of the composite walls subject to arbitrary loads, it is not accurate to calculate the horizontal displacement of the hybrid structure by using the displacement formulations of the frame-shear wall structure. And therefore, a displacement calculation method for the hybrid structure subjected to horizontal loads should be proposed. In this paper, the composite walls are viewed as shear-flexural type cantilever walls and the shear walls as flexural type cantilever walls. Based on the Timoshenko beam theory, the displacement differential equation of the hybrid structure is proposed by the continuum method. The analytical solutions of the displacement equation for the hybrid structure subject to the inverse triangle load are obtained with boundary conditions. The example indicates that the lateral displacement curve of the hybrid structure from the proposed method exhibits a shear-flexural type characteristic in which the shear deformation should not be ignored.
Study on Technology of Filter Made by Engineering Grade Thermoplastic Polyurethane
Authors: Zhang Jia Min
Published: March 2011

This paper introduced the different classifications and advantages of the project level thermoplastic polyurethane elastomer ,and according to the injection molding process of raw materials Isoplast 302EZ and thermoplastic polyurethane elastomer, from raw material preparation, injection machine selection, tooling selection, molding conditions, and introduced TPU injection molding process .The filter housing of TPU were briefly discussed from the design goals, technical characteristics, performance analysis. Combination of typical products, we studied the technology of the production of the thermoplastic polyurethane flexible filter housing. The results showed that the material should be pre-dried in a vacuum, and the time, temperature and pressure should be controlled properly. It should be pay attention that the specification of the waste and the raw materials should be the same, when recycling and on the other hand, the quality of the productions should be improved and no pollution should be ensure during the process; to avoid the decomposition temperature and the products aging, we should empty the material or stop the machine during it doesn’t work.
Preparation of Palladium Nano-Particles by Electrospinning and its Application in Hydrogenations
Authors: Yu Jian Xiang , Liu Tai Qi
Published: March 2011

a novel fibrous catalyst containing palladium nano-particles was produced via electrospinning technique. The fibrous catalyst was characterized by scanning electron microscopy and transmission electron microscopy respectively, the results showed that the diameter of fiber was about 200 nm and the palladium (Pd) particles were in the range of 30~40 nm. The catalyst was tested in hydrogenations of α-olefins, cyclohexene and nitrobenzol in ethanol at room temperature under 1 atmosphere hydrogen. The results showed that the titled catalyst had high activity in the hydrogenations of α-olefins, cyclohexene and nitrobenzol.
Further Research about Fast Extraction Method of Auditory Brainstem Response
Authors: Gui Jian Bin , Sun Ying , Gao Wu , Gao Rui Jing
Published: March 2011

There are the similarities and the differences between wavelet transformation and traditional superposing and averaging method are discussed in de-noising ABR signal. Actually, it is easy to see that the advantage of wavelet transform, but it’s unbelievable to other people. In this paper, by spectral analysis, a quantity measurement estimate is given. So we can conclude that wavelet transform has better result than traditional superposing and averaging for noise removal.
4-Substituted Benzoic Acids Functionalized Multi-Walled Carbon Nanotubes in Mild Polyphosphoric Acid/Phosphorous Pentoxide
Authors: Liu Hai Hui , Wang Ning , Hou Li Chen , Peng Wei Wei , Jin Yan Mei , Zhang Xing Xiang
Published: March 2011

Pristine multi-walled carbon nanotubes (P-MWNTs) were functionalized with 4-substituted benzoic acid via ‘‘direct’’ Friedel-Crafts acylation in mild reaction medium of polyphosphoric acid (PPA)/phosphorous pentoxide (P2O5). Raman spectroscopy, thermogravimetric analysis, transmission electron microscopy were applied in this paper to demonstrate that multi-walled carbon nanotubes inherently have functional groups on their surfaces as a result of the reaction. The overall evidence indicates that the 4-substituted benzoic acid functionalization of carbon nanotube can be achieved without oxidation as pre-treatment. Thus, aryl carbonyl moieties with different length of 4-substituted alkyl acyl amine functionalized MWNTs（F-MWNTs） can be synthesized simply, without disrupting the primary structures of the nanotubes.
The Effects of Annealing Temperature on the Microstructure and Properties of Cold-Rolled 5083 Aluminum Alloy
Authors: Bai Zhen Hai , Luo Bing Hui
Published: March 2011

The effects of annealing temperature on the strength and corrosin properties of cold-rolled 5083 aluminum alloy (ε=60%）were investigated. The results show that the tensile strength of the alloy decreases with rising annealing temperature. The alloy shows ductile cracking in dry air and brittle cracking in 3.5%NaCl aqueous solution. The alloy reserves the most positive electrical potential at 200°C, and low SCC susceptibility at 200、250°C when annealed, but reserves relative high SCC susceptibility at 100, 150,300 and 350°C, which can be attributed to the difference shape and distribution of β-phase annealed at different temperature.
A Study on Soft Water Attack Resistance of Concrete
Authors: Liu Dong Mei
Published: March 2011

The infiltration corrosion characteristics of concrete have been studied by determining the seepage coefficient and CaO and SiO2 dissolutions of concrete. The results show that, under the infiltration corrosion of soft water, the infiltration coefficient of concrete decreases gradually with the corrosion time prolonging, but finally goes to a special value. The CaO and SiO2 accumulative dissolutions increase with the time prolonging, and also finally go to a special value. The amount of CaO dissolved by seepage water can be used to evaluate the erosion durability of concrete. The common concrete in this paper is durable at the action of soft water erosion.
Study on Properties of Artificial Cylindrical Ice
Authors: Zhang Liao Yuan , Chen Hao , Yao Jun , Chen Ke
Published: March 2011

Because of the terrain changes, the ice of foundation under the building and floating ice on the Yellow River often meet the stress. Therefore, research on the ice properties has important significance to ice dynamic processes of ice glaciers, rivers, lakes, sea ice and icebreaker. In this paper, the properties of artificial cylindrical ice is analyzed and researched. Prepared process of artificial cylindrical ice and the determination using pressure testing machine on artificial cylindrical ice are given, mainly including the production of frozen mold, the production and processing of ice samples and researching on the properties of the cylindrical ice. When frozen temperature is -10,-20,-30，-40°C, constant loading speed 1，3，5，7，10 mm/min is loaded with pressure testing machine on icicle, it can be concluded the influence of frozen temperature and loading speed on icicle.
Fluid Hydrodynamics in a Single Inlet and Multi-Inlet Hollow Fiber Module
Authors: Wang Ying , Zhang Hui Feng , Zhang Yu Shan , Yao Ying , Liu Wei , Gao Shu Bao , Cai Rong Hua , Wu Dan
Published: March 2011

A single inlet and multi-inlet hollow fiber modules (HFMs) were designed in order to investigate the fluid hydrodynamics of the shell side. Residence time distribution (RTD) curves was measured under different packing density and inlet. Mean residence time ( ), variance( ) and the number of tanks (N) were also calculated to reflect the degree of backmixing. The experimental results indicated that the random packing of fiber caused the non-ideal flow in shell side. With the increasing of the packing density, the non-ideal flow was more serious. Contrasting to the traditional one, multi-inlet hollow fiber modules could weaken the trailing of the RTD curves and control the backmixing. With the quantity and the site of the inlets changed, non-ideal flow can be further improved. The hydraulic characterization of the shell side flow were related with not only the quantity but also the site of inlets. The results indicated that the muti-inlets design is superior to that of a single inlet.
Research on the PVDF Hollow Fiber Gas Membrane Used for Bromine Extraction
Authors: Yao Ying , Liu Wei , Zhang Hui Feng , Cai Rong Hua , Wang Ying , Gao Shu Bao , Wu Dan , Zhang Yu Shan
Published: March 2011

In this paper, several types of PVDF hollow fiber membranes used in the gas membrane separation process for extracting bromine from simulated seawater or concentrated seawater were studied. The micropore, hydrophobic property, mechanical strength and material chemistry of the PVDF membranes soaked in seawater or concentrated seawater were characterized by SEM-EDX, IR, contact angle testing instrument and electronic fabric strength tester, which were compared with those of origin membranes. At last, the mass transfer coefficient and flux during a long time were gained by operating a permeation experiment with a chosen type of PVDF membrane module.
The Optimal Application of GA-Improved Wavelet Network in Optical Fiber Sensor
Authors: Zhao Hong
Published: March 2011

Based on GA-improved wavelet neural network, this paper explored the Optical Fiber through the establishment of static property 3-dimension compensation model of the optical fiber sensor system. This paper has combined the advantages of both wavelet neural network and genetic algorithm and is thus capable of searching for global optimal solution in the solution space which has very promising application prospect in the areas such as intelligent sensor modeling and compensation.
Automatic Inspection and Classification for Casting of Tractors Chassis Based on Machine Vision Recognition Technology
Authors: Zhao Hong
Published: March 2011

In the course of inspecting and classifying small castings used coal mine, currently the equipment being used has severe limitation that inspection accuracy and classification efficiency is low. With the aid of machine vision recognition technology, the automatic inspection and classification system for small castings developed by author resolved above problems successfully, inspection and classification operation realized automation entirely, inspection accuracy and classification efficiency improved evidently.
Autoclaved Brick from Semi-Dry Desulfuration Ash
Authors: Li Hao , Zhao Feng Qing , Li Qian , Fu Lin Lin , Liu Shao Jie
Published: March 2011

The modified desulfurized ash is prepared through autoclave curing the desulfurized ash for 6 h at 175.4 oC in the presence of 2.0 wt% Fe2O3 and 0.75 wt% H2O2. In this process, 47.64 % of the calcium sulfite in the desulfurized ash is converted into calcium sulfate. The autoclaved brick is made by 36 wt% modified desulfurized ash, 24 wt% fly ash, 32 wt% sand and 8 wt% stones. The water-solid ratio is 0.10. The compressive strength of the brick is up to 15.7 MPa. For this method, the calcium oxide and calcium sulfate in the modification desulfurized ash are used to replace the lime, gypsum and other materials. The solid wastes are reused and natural resources are saved.
Mechanical Performance of a New Coir Fiber Laminated Composites
Authors: Yao Jia , Hu Ying Cheng , Lu Wei , Li Jin
Published: March 2011

In order to overcome the uneven distribution of coir fiber density in the materials and the poor forming of the outer surface, a new type of coir fiber hybrid laminated composites has been developed. The non-woven needle felts of coir fiber are added as the core material, wood veneers are as the surface material, and E-type glass fiber felts are as the reinforcement material, the preparation of hybrid laminated composites has been carried out. Through the performance testing and scanning electron microscopy (SEM) analysis, a new type of biomass composite with excellent performance has been successfully developed. The application of coir fiber to obtain good impact toughness of composites has been effectively verified.
Detection for Position of Suspended Transparent Film in the Water
Authors: Qiu Zu Rong , Cao Rui
Published: March 2011

Considering the measurement system for the suspended position of the transparent film in the water, an image processing method based on watershed transform for contour detection has been proposed. The difference between the film and water has been researched by obtaining the image information through the image sensor under special light source. An algorithm of watershed which uses minima imposition to solve the problem of over segmentation for the detection is applied. Depending upon the improved algorithm, which aims to obtain the contour of the film, the target areas in the image integrate together. The result of the position is gained by the image processing technology, which provides the technical basis for automatic operation of catching film in the water.
First-Principles Investigation about the Plastic Property of Doping Ni in Ir Solid Solution System
Authors: Chen Rong , Chen Jing Chao , Yu Jie , Lu Wen Ting , Xue Jin Hong
Published: March 2011

We mainly give research and application status of iridium and iridium alloy materials in this paper, then prospect development tendency and application of the iridium alloy in the future. This paper based on density functional theory of first-principles plane wave method, choose local density approximation (LDA) potential to calculate the different doped amount of Ni in Ir Solid Solution System, found the impact on plastic property, the calculation results reveal that Ir44Ni4 began to show the plastic performance, With the increaseing of the adding Ni atom later, plastic performance becomes more and more strong.
Fuzzy Iterative Learning Control of Servo System
Authors: Liu Hong Li , Zhu Qi Xin , Chen Xiang Wen
Published: March 2011

According to the repeatability characteristics of servo system, a fuzzy iterative learning controller is proposed which combining advantages of fuzzy control and iterative learning control. Fuzzy control has better robustness, and does not require accurate model of the system, only need the previous experience, the design method is simple. Fuzzy controller is used in the position-loop, but the static error is difficult to eliminate, iterative learning controller use the control error to adjust the previous control input to reduce the error of next time. The combination of these two intelligent control algorithms can improve the control performance of servo system effectively. Simulation results show that the fuzzy control combined with iterative learning control can achieve better control performance in servo system.
Influences of Strain Rate and Deformation Temperature on Flow Stress and Dynamic Recrystalliazation of Heat Resistant Steel P91
Authors: Jin Xue Qin , Bi Da Sen , Zhang Jian , Wang Xiao Lan , Song Jian Hua , Wang Zhi Hua
Published: March 2011

In power station big caliber thick wall seamless tube typical steel P91for example, The hot deformation behavior and heat flow stress-strain curve of the heat resistant steel P91was investigated with a compression test on Gleeble3500 simulator at a temperature range of 1050°C～1200°C and strain rate range of 10-4～5s-1. The test curve shows that P91 materials have the dynamic recrystallization and recovery behavior in high temperature and deformation. With the rise of temperature and strain rate of decreased, flow stress is lower and the dynamic recrystallization phenomenon is easier to occur. By metalloscope observed, in the high temperature and low strain rate conditions, the dynamic recrystallization area and new nucleation grain size are larger, and microstructure is more uniformly distributed.
Effect of Trace Ni, Al and Cr on the Surface Film Structure of Sn-Pb Liquid Alloys
Authors: Gan Gui Sheng , Du Chang Hua , Luo Yi , Chen Fang , Yang Bin
Published: March 2011

Sn-37Pb solder alloys doped Ni, Al and Cr separately were prepared, and the effect of trace doped elements on the surface film structure of Sn-Pb liquid solder alloys was studied by X-ray photoelectron spectroscopy (XPS). The results showed that the surface of Sn-37Pb liquid alloys was mainly SnO2 and PbO after oxidizing and laying for five minutes at 250°C, and the enrichment of trace Al and Cr was on alloy surface, but the enrichment of trace element Ni was not obvious. The surface oxidation film of Sn-Pb liquid solder alloys was become denser after adding 0.05wt% Ni or Al, which will reduce the growth rate of oxidation film. The thickness of oxidation film was only one-fifth of its original under experimental conditions. However, the oxidation film was become looser after adding trace 0.05wt% Cr, the growth rate was accelerated, and the thickness of oxidation film was increased to two times of its original. Trace Ni and Al were characterized with selective oxidation on Sn-37Pb alloys surface.
Longitudinal Interaction between Welded Turnout on Continuous-Slab-Track and Bridge
Authors: Chen Rong , Ping Wang , Zhao Wei Hua
Published: March 2011

According to mechanical characteristics of welded turnout on continuous-slab-track and bridge, an integrated turnout/track slab/beam/pier finite element model was established to analyze the interaction between welded turnouts on continuous-slab-track and bridge. The study focused on No.18 turnout (60kg/m rail) with movable frog being laid on a (32+48+32) m continuous beam, expansion additional force and braking additional force of the turnout were calculated when the temperature dropped. The results show that the longitudinal interaction between welded turnouts on continuous-slab-track and bridge is small, which presents a reasonable structure type of welded turnout on bridge; in calculation of the expansion force, when the temperature drops, the shrinkage and creep of the base-slab and longitudinal stiffness reduction caused by the cracking are considered, so the results are more representative than those from the case of rising temperature. Therefore, the case of temperature dropping should be the main concern in design; under the action of the braking force, stress and deformation of each component within this turnout/bridge system are comparatively large.
Influence of Cyclic Heat Treatment and Oxygen Content on the Rolling Contact Fatigue of JIS SUJ2 Bearings
Authors: Santos Edson Costa , Kida Katsuyuki , Honda Takashi , Rozwadowska Justyna , Houri K. , Hashimoto Kazuya
Published: March 2011

In this work, two SAE 52100 grades with different oxygen contents were repeatedly quenched and the influence of this cyclic heat treatment as well as the role of the oxygen content level on the mechanical properties of the material were investigated by rolling contact fatigue tests. The repeated quenching process increased the retained austenite content and had little influence on the material’s hardness. The prior austenite grain size was decreased and consequently, refinement of the martensitic phase in both types of materials occurred. The higher content of the retained austenite (higher fracture toughness) and the refinement of the microstructure accounted for the higher fatigue properties of the repeatedly quenched material. Flaking failure was present in the material quenched only once, after 4.3x107 cycles (higher oxygen content) and 108 cycles (lower oxygen content). Flaking failure did not occur in the samples treated by repeated quenching. The results show the importance of both optimized heat treatment and alloy cleanness for the lifetime of bearing steel.
Petroleum Pipeline Leakage Forecasting Based on Artificial Neural Networks
Authors: Zhang Xin Bo , Chen Jin Sai
Published: March 2011

The technologies of artificial neural networks can be used to complete information processing of the networks through the interaction of neural cells. The mappings of the stimuli effects and the input and output estimates are obtained via combinations of nonlinear functions. This offers the advantages of self-learning, self-organization, self-adaptation and fault tolerance. It also has the possibility of use in applications for petroleum pipeline leakage forecasting. First we use the flow of the inlet in the pipe as input, and the flow of the outlet in the pipe as output to build a artificial neural network for diagnosing the pipe. This method has been shown to offer better results in performance and efficiency. It is expected that the application of this system will increase sensitivity and further increase petroleum pipeline leakage forecasting performance.
Application of Information Technology in Construction Project Management
Authors: Tan Jian Ling , Dong Xin Fa , Li Xiao Juan
Published: March 2011

This paper introduces an integral part of engineering information management and information management system development and applications in engineering project. It points out that highly developed network of information technology can realize monitoring important parts and process of project in the video. Information management system copies with complex information to identify and summarize the different categories then issues for works to provide accurate and timely information to achieve objectives of project management. It will also have a profound impact on promoting the construction of process standardization and improving the quality of the project.