bluuebunny/crossref_metadata_2025 huggingface dataset:
Size Effect on Volume-Shape Change of both Micro and Nano Aluminum-Silicate Minerals
Authors: El-Sheikhy Refat , Al-Shamrani Mosleh
Published: February 2011

Both conventional and nano silicate minerals have importance for several fields of advanced technological research and industries. Nano clay can be used as filler material or reinforcement for other materials to produce nanocomposite as the case of clay based-polymer nanocomposite. Nowadays there is worldwide interest of these materials which may be synthesized or natural. In current paper, shrinkage phenomenon has been studied and cracks of this material using natural Saudi Arabian smectite type MMT. The three dimensional changes of cubic samples of nano clay are studied and compared to conventional clay, semi conventional-semi nano clay and another cementous type of clay based nanocomposite. It is found that nano clay changes are very sensitive and high without cracking while conventional clay type has less change accompanied by cracks. On the other hand semi conventional-semi nano clay mineral composite has intermediate resuls of volume change with cracks but less than the pure conventional type. SEM, EDAX and XRD characterizations are made. Both volume and length changes are recorded. The study can be considered as the base of proposing of new swelling – shrinkage theory.
Growth Kinetics and Microstructure of Siliconized Layer by Molten Salt Electrodeposition
Authors: Yang Hai Li , Cui Chang Wei , Li Yun Gang , Tang Guo Zhang , Zhang Yu Zhu
Published: February 2011

The siliconized layers were formed on the surface of hot rolled grain oriented silicon steel using a molten salt pulse electrodeposition method. The process was performed in the temperature range 1023-1123 K and with varying deposition time (60-180 min). The profile distribution of Si in the siliconized layer was measured using the glow discharge spectrometry (GDS) and the depth from the surface to the substrate was taken as the layer thickness. The morphology and structure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that a longer deposition time tended to produce a larger grain and a looser, rougher layer. The phase structure of the layer was composed of Fe3Si with (110) preferred orientation in the experimental range. The longer deposition time resulted in an increase in thickness layer and the thickness of the layers ranged from 17 to 165m. Kinetic studies showed that the siliconized layer grew with a parabolic rate law, indicating the diffusion controlled growth. The activation energy for growth of siliconized layer was about 242 kJ/mol.
Effect of the Milling Conditions on the Formation of Nanostructured Fe–Al Powders
Authors: Hamlati Zineb , Guittoum A. , Bergheul S. , Souami N. , Taibi K. , Azzaz M.
Published: February 2011

Nanocrystalline Fe72Al28 alloy samples were prepared by the mechanical alloying process using planetary high-energy ball mill. The alloy formation and different physical properties were investigated as a function of milling time, t, (in the 0-24 h range) by means of the X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), energy dispersive X-ray (EDAX) and Mössbauer spectroscopy. The complete formation of bcc-FeAl solid solution is observed after 4 h of milling. The lattice parameter, a (nm), quickly increases within the first hours of milling and reaches a maximum value of 0.291 nm at 12 h of milling time; then a (nm) decreases to a value of 0.2885 nm for 24 h. The grain size decreases from 55 to 10 nm, while the strain increases from 0.18% to 0.88%. Grain morphologies at different formation stages were observed by SEM. The Mössbauer spectra show different behaviors with the increase of milling time. Indeed, after 4 h, the Mössbauer spectrum shows the presence of a singlet and sextet. The singlet indicates the presence of paramagnetic phase characteristic of A2 disordered structure and the sextet with a mean hyperfine field, , of 21 T is indicative of ordered DO3 structure. After 8 h of milling, the paramagnetic phase disappears leading to the appearance of a sextet, with a mean hyperfine field, Hhf, equal to 24.18 T which is characteristic of DO3’ structure. For the higher milling time i.e. 24 h, the Mössbauer spectrum was analyzed with two components. The first one with equal to 29.9 T is still indicative of ordered DO3, however, the second with a value of 10.25 T is characteristic of the fine domain B2 ordered structure.
Supplier Selection Model Based on Two Stage Signal Game and Reputation Mechanism
Authors: Ma Xin
Published: February 2011

Asymmetric information will lead to adverse selection in the supplier selection in the supply. One the basis of game theory and information economics theories, a two stage supplier selection signal game reputation model is presented. The optimal price signal and utility of supplier are derived under symmetric and asymmetric information. The optimal signal of supplier will be strengthen and the utility at the second stage will also be increased if the supplier sets up reputation at the first stage, and it also shown that more utilities can be achieved when a supplier uses reputation.
Acoustic Modes in the Annular Duct with Uniform Mean Flow
Authors: Liu Zhan Xin
Published: February 2011

There are many benchmark problems in computational aeroacoustics (CAA) and acoustic mode in the annular duct with uniform mean flow is a problem of this kind. The energy relation of the duct mode is deduced from the governing equation, Euler equations in this paper. If the sound power level, angular frequency, azimuthal mode number and radial mode number are given, the acoustic mode in the annular duct can be expressed explicitly by the deduced results. The simulation of two different cases shows the propagation of a single acoustic mode in annular duct pictorially.
Curing Effects on Air Permeability of Concrete
Authors: Camarini Gladis
Published: February 2011

The kinetics of cement hydration can be accelerated by steam curing and this kind of curing can be responsible for increasing concrete porosity, since a greater portion of non hydrated cement particles can be present. The increased porosity results can result in increased permeability. The aim of this work was to investigate the influence of curing on concrete quality by air permeability and compressive strength test. It was measured by means of a non steady state air permeameter. Concretes were produced with Portland cements containing 0%, 27% and 53% of ground granulated blastfurnace slag. The amount of slag in cement influenced concrete performance and steam curing increased air permeability of concrete.
Research on Combustion Process and NOx Formation in a Marine Diesel Engine
Authors: Zhou Song , Zhu Yuan Qing
Published: February 2011

This paper presents the simulation results of histories of pressure, temperature and NO concentrations as well as combustion process and NOx formation in a marine diesel engine. The simulation was done within a full engine cycle with a three-dimensional, transient combustion model including a more accurate NO formation model. Simulation results were verified by data obtained from benchmark tests and further analyses of distributions of pollutants were carried out in this paper. Conclusions from simulation about engine combustion and NOx formation have been finally achieved.
Study on Fabrication, Defects and Compression Properties of Al Foams at Different Foaming Temperatures
Authors: Zhao Wei Min , Zhang Hui , Li Hai Peng , Wang Zhi Feng , Zhao Yang , Zhao Rui , Hur Bo Young
Published: February 2011

Using Al powder as thickening agent and CaCO3 powder as foaming agent, Al foams with above 85% porosity, pore sizes between 1mm and 4mm and relatively uniform pore structure have been fabricated by melt foaming method at different foaming temperatures. Meanwhile, the paper researched the effect of foaming temperature on foaming effect and analyzed the defects in Al foams. At last, compression test were taken in order to investigate the mechanical properties of aluminum foams. The results showed that pore structure, pore distribution and compression properties of Al foams fabricated at 720°C were much better than that fabricated at lower temperature.
Research of Electrodeposited RE-Ni-Fe-P-PTFE Composite Coating
Authors: Chen Hao , Li Jin Hui , Yang Jian Gao
Published: February 2011

Composite coating is a very important part in new materials because it has special excellent physical and chemical properties, and PTFE composite coating is low friction coefficient, high temperature stability and high chemical resistance. To prepare excellent RE-Ni-Fe-P-PTFE composite coating through electrodeposition, some experiments were completed, and the effect of surfactant conc., PTFE conc., and the conc. of rare earth on PTFE content in the coating was studied. The results show that the optimum electrodeposited conditions are that the conc. of rare earth La is 3 g/L, the conc. of PTFE solution is 50 ml/L, temperature is 55 °C, current density is 10 A/dm2. And that the friction coefficient of the coating is decreased significantly, and the lubricating property is improved.
Application of Improved BPNN to Damage Detection of Composite Materials
Authors: Dong Xiao Ma
Published: February 2011

A dynamic method based on improved algorithm BP neural network for damage identification of composite materials was proposed. By using wavelet series, the features of signals were extracted and input to improved algorithm BP neural network for training the network and identifying the damages. Finally, the experiment results show that this proposed method can exactly identify the faults of composite materials.
Daily Maximum Electric Load Forecasting with RBF Optimized by AFSA in K-Means Clustering Algorithm
Authors: Shen Wei , Sun Yue Shi
Published: February 2011

Electric load forecasting is an important aspect in the operation of energy market. Many researchers have tried various methods and have achieved considerable results. In this paper, we used Radial Basis Function Neural Network (RBFN) to train data and forecast daily maximum electric load of a costal city in North China. In order to have a better result, we introduced Artificial Fish Swarm Algorithm (AFSA) to optimize RBF and adjust the center of K-means clustering algorithm. Data mining techniques were also employed to select indicators with impact on electric load. By comparing the forecast values and actual data, we arrived at conclusion that RBF optimized by AFSA could produce accurate result in forecasting daily maximum electric load. We also found that climate factors (temperature, humidity and air-pressure) had significant impact on daily maximum electric load.
Neural Ensemble Coding during Working Memory Task in Rat Prefrontal Cortex
Authors: Bai Wen Wen , Tian Xin
Published: February 2011

Working memory is one of important cognitive functions and recent studies demonstrate that prefrontal cortex plays an important role in working memory. But the issue that how neural activity encodes during working memory task is still a question that lies at the heart of cognitive neuroscience. The aim of this study is to investigate neural ensemble coding mechanism via average firing rate during working memory task. Neural population activity was measured simultaneously from multiple electrodes placed in prefrontal cortex while rats were performing a working memory task in Y-maze. Then the original data was filtered by a high-pass filtering, spike detection and spike sorting, spatio-temporal trains of neural population were ultimately obtained. Then, the average firing rates were computed in a selected window (500ms) with a moving step (125ms). The results showed that the average firing rate were higher during workinig memory task, along with obvious ensemble activity. Conclusion: The results indicate that the working memory information is encoded with neural ensemble activity.
Modeling of a Direct-Drive Table for Automatic Wire Bonder
Authors: Wang Fu Jun , Zhao Xing Yu , Ma Zhi Peng , Zhang Da Wei
Published: February 2011

This paper presents the modeling of a high-accuracy and high-acceleration table used for automatic wire bonder. The table is directly driven by linear voice coil motor (LVCM), and thus the mass and inertia of the motion system are significantly reduced by using a novel flexible decoupling mechanism based on flexure hinges and preloaded spring. The decoupling principle of the mechanism was introduced, and the electromechanical coupled mathematical model of Y-axis table was evaluated according to the dynamics of a mechanical mass-spring-damp system and LVCM. The model of Y-axis table was then identified with the aid of a Laser Interferometer and data acquirement card. Model validation experiments were carried out, and the results show that the model has sufficient accuracy when used to predict the performances of the real-world system under new conditions, and meanwhile it also can provide important information for the control of Y-axis table.
Magnetron Sputtering of NiCr/NiSi Thin-Film Thermocouple Sensor for Temperature Measurement when Machining Chemical Explosive Material
Authors: Zeng Qi Yong , Hong Tao , Chen Le , Cui Yun Xian
Published: February 2011

Temperature plays a vital role in the machining industry today. A Nickel-Chrome versus Nickel-Silicon thin-film thermocouple system has been established for measuring instantaneous workpiece temperature in chemical explosive material machining. The NiCr/NiSi thin-film thermocouples have been deposited inside high speed steel cutters by magnetron sputtering. The typical deposition conditions are summarized. Static and dynamic calibrations of the NiCr/NiSi thin-film thermocouples are presented. The Seebeck coefficient of the TFTC is 40.4 μV/°C which is almost the same as that of NiCr/NiSi wire thermocouple. The response time is about 0.42ms. The testing results indicate that the developed NiCr/NiSi thin-film thermocouple sensors can respond fast enough to catch the very short temperature pulse and perform excellently when machining chemical explosive material in situ.
Realization and Simulation of Motion Trajectory of a 2-DOF Planar Parallel Manipulator
Authors: Zhu Xiao Rong , Shen Hui Ping , Zhu Wei
Published: February 2011

A kind of 2-DOF parallel manipulator driven by two sliders moving along two parallel guides is analyzed. Based on the explicit expression of inverse position, velocity and acceleration analyses, the mobile trajectory of this manipulator is investigated and simulated. In trajectory planning, the trajectory profiles are assigned to be accelerated and decelerated at the first and last few seconds, respectively, and keep at constant speed for the remainder of time, where the forth-order polynomial is fitted during acceleration and deceleration, and clothoid curve is applied around the corner of axis. Then the mobile rule exerted on the actuator sliders is obtained using inverse position based on the desired end-effecter trajectory. Finally, the virtual prototype of this mechanism is modeled using Solidwork and the kinematics and dynamics simulation is performed using Cosmostion. The result shows that both velocity, acceleration of the sliders and the driving force exerted on the sliders are continuous curves, which can fully satisfy the demand of high-accuracy and real-time processing of the high-speed Manipulator.
The Numerical Simulation on the Temperature Field of Laser Cladding
Authors: Zheng Li Yun , Xie Wen Zheng , Li Yu Ling
Published: February 2011

This article uses the finite element software ABAQUS in the process of laser cladding to form the numerical simulation, which establishes numerical simulation model of the temperature field of laser cladding forming the heat transfer. The results show that the laser scanning position of the cladding layer depth direction of a high temperature gradient. Simulation of temperature changes of a known point the temperature change in laser scanning region is drastic. The experimental results show that the numerical simulation model of the temperature field is reasonable. Therefore, the numerical simulation model can be used to analyze the influence of the laser cladding parameters on the temperature field and simulate remelting depth under any scanning speed.
An Algorithm of Complete Coverage Path Planning for Autonomous Underwater Vehicles
Authors: Yan Ming Zhong , Zhu Da Qi
Published: February 2011

Complete coverage path planning (CCPP) is an essential issue for Autonomous Underwater Vehicles’ (AUV) tasks, such as submarine search operations and complete coverage ocean explorations. A CCPP approach based on biologically inspired neural network is proposed for AUVs in the context of completely unknown environment. The AUV path is autonomously planned without any prior knowledge of the time-varying workspace, without explicitly optimizing any global cost functions, and without any learning procedures. The simulation studies show that the proposed approaches are capable of planning more reasonable collision-free complete coverage paths in unknown underwater environment.
The Memory of Fuzzy Neural Network Based on Lattice Point Distribution
Authors: Li Jin Ling
Published: February 2011

This paper deals with the condition for a fuzzy neural network to realize memory, gives the concept of lattice point and proves that if sample set is of lattice point distribution the sample set can be memorized by a fuzzy neural network, otherwise the fuzzy neural network will lost its memory. A theorem shows that Choice-memory method not only reduces computation but also ensures memory of fuzzy neural network.
Design, Model on MATLAB and Realization by C Language about Repetitive Control
Authors: Huang Hu , He Jia Fen
Published: February 2011

Voltage waveform distortion of Aeronautical Static Inverter (ASI) has a solution, which is the repetitive control technology. In this paper, have established the model of repetitive control system; have stated its principles and method of parameter design; have proved the stability of repetitive control system; have verified the validity of it in MATLAB software; finally have established its C language procedure.
Design of MFCS with Time-Delay for Chemical Processing System
Authors: Wu Shu Jing , Wang Da Zhong , Okubo Shigenori
Published: February 2011

We can design model following control system (MFCS) with time-delay whose internal states are bounded. Time-delay widely exists among controlled objects in computer control processes, power systems, chemical processing systems, metallurgical processing systems, environmental systems and communication systems transmission systems and other industrial production activities[1]～[5], and makes it difficult to evaluate effects of control system input signals in time, which will ineluctably deteriorate performance of the control system in automatically removing outside disturbances, and influence stability of the system. This paper discusses a design of predictive control of MFCS for the linear time-delay based on the model following control theory proposed by Okubo[6], and is thus considered to be innovative and applicable. It is confirmed on basis of a numerical example that the output signal of the control system asymptotically follows the reference model signal in the case of the existence of disturbances.
Study on Architecture and Implement Strategy of Green Remanufacturing Management
Authors: Guo De Wei , Jiang Zhi Gang
Published: February 2011

Green remanufacturing management, a sustainable management mode of development strategy, integrated the philosophy of green manufacturing and advanced manufacturing techniques, deeply implementing the reduction of resource consumption and environmental impact. It is the important link in the multi-lifecycle engineer of the products, which can effectively manage each link in the remanufacturing process of the products. In this paper, the connotation and characteristics of the green remanufacturing management were analyzed, and according to the current research situation of green remanufacturing management mode, the architecture including theoretical basis, content system and supporting techniques were proposed. On the basis of that, the key stage of the content structure: end-of-life management of recovery product, remanufacturing production management, performance assessment of remanufacturing product and reuse of remanufacturing product were expatiated in detail. In the end, the application strategy of the green remanufacturing management was discussed from the view of the sustainable development.
Analysis on Function Components and Biohealth Function of Black Bamboo Biomass
Authors: Ma Qing Zhi , Wu Feng Juan , Zhang Dang Quan , Peng Wan Xi
Published: February 2011

Black bamboo is becoming a major biomass in rooms. Therefore, the chemical components from black bamboo were identified by TD-GC/MS. The main function components of black bamboo biomass at 40°С were acetic acid(24.71%), 1,1,1,5,7,7,7-heptamethyl-3,3-bis(trimethylsiloxy)tetrasiloxane(17.58%), 1h-indole-2-carboxylic acid,6-(4-ethoxyphenyl)-3-methyl-4-oxo-4,5,6,7-tetrahydro-, isopropyl ester(16.85%), cyclooctasiloxane, hexadecamethyl-(15.28%), cyclotrisiloxane, hexamethyl-(4%), etc. And the main function components at 50°С were acetic acid(40.39%), 1,1,1,5,7,7,7-heptamethyl-3,3-bis(trimethylsiloxy)tetrasiloxane(24.47%), octasiloxane,1,1,3,3,5,5,7,7,9,9, 11,11,13,13,15,15-hexadecamethyl-(16.39%), bicyclo[2.2.1]heptan -2-one, 1,7,7- trimethyl-, (1s)- (3.73%), tricyclo[2.2.1.0(2,6)]heptane, 1,7-dimethyl-7-(4-methyl-3-pentenyl)- , (-)-(3.57%), etc. Black bamboo biomass was more healthy to human at 40°С than 60°С. So black bamboo biomass was fit to use in rooms.
Impersonation Attack on RFID Authentication Protocol and its Countermeasures
Authors: Lee Yung Cheng
Published: February 2011

Due to the well-developed technology and its variety of applications, the Radio Frequency Identifications (RFIDs) are widespread in a broad range of markets. In many applications, the RFID systems need security service such as authentication mechanism to identify tag and resist possible attacks. In 2008, Song et al. proposed a RFID authentication protocol for low-cost tags. Their protocol has the merits of privacy and security properties, and it can stand tag impersonation attack, replay attack, and backward/forward traceability. In this article, we show that their protocol cannot resist server impersonation attack as they declared. An adversary can successfully impersonate as a server to send fake message for verification. We also present countermeasures to fix the flaw. The performance of the improved mechanisms is the same as that of Song et al.’s protocol while the server impersonation attack is avoided.
Configuration Software WinCC Application in Concrete Production
Authors: Che Xin Sheng , Jiang Jiong Wei
Published: February 2011

In order to make concrete production more stable and efficient, a weighing and monitoring system is constituted which provides visualization of process and a powerful Human-Machine Interface by SIMATIC WinCC. After WinCC configuration software has connected with PLC effectively, data can be transmitted to and received from PLC through communication by HMI screen. Then, PLC can control the field devices independently rely on its high reliability and high anti-jamming capability. This kind of monitoring system is more efficient than other non-automatic control systems, and it improves accuracy and reduces the production time. Monitoring concrete production through WinCC can save manpower, reduce raw material waste, improve the level of automation and production efficiency. It provides a new control method for concrete production.
Analysis on Torsional Fatigue Life of Turbo-Generator Shafts
Authors: Gu Yu Jiong , Jin Tie Zheng
Published: February 2011

Both low-cycle fatigue and high-cycle fatigue exist during torsional vibrations, but the impact of high-cycle fatigue has rarely been considered. In this paper, a torsional fatigue life analyzing method used for torsional vibration of turbo-generator shafts has been developed based on Manson-Coffin equation and high-cycle fatigue theory. The method has been used to estimate the torsional fatigue life in the most dangerous section of the shafts in a power plant. The cumulative torsional fatigue damage under two-phase short circuit simulation has been predicted.
Research on Enterprises Scientific Development Performance Evaluation Model
Authors: Geng Yun Jiang
Published: February 2011

According to the connotation of Scientific Outlook on Development, this paper constructs an enterprises scientific development performance evaluation model based on factor analysis and combination weighting. The innovation points and contributions are in three aspects. First, by evaluating performance from the manpower criterion, the basic idea of Scientific Outlook on Development of people-oriented is reflected. Second, by applying the factor analysis to screen evaluation indicators, fourteen indicators are selected to reflect more than 85% of original information and avoids information duplication and redundancy. Third, by determining the combination weight through multiplicative synthesis method based on G1 and TOPSIS, it fully utilizes experts’ subjective experiences and objective information.
Post Classification Comparison Change Detection of GuangZhou Metropolis, China
Authors: Yang Xiao Feng , Wen Xing Ping
Published: February 2011

Change detection is one of the most important applications of remote sensing techniques due to its capability of repetitive acquisition imageries with consistent image quality, at short intervals, on a global scale, and during complete seasonal cycles. This paper uses two Landsat ETM+ imageries acquired in 2000 and 2002 respectively to detect change of Guangzhou in southern China during two years using post classification comparison method. Firstly, two remote sensing data are precision geometrically corrected to UTM projection with a root mean square error (RMSE) of 0.3 pixels, and then they are classfied using Maximum Likelihood method respectively. Images are classified into four classes which are water, forest, grass or crop and building，soil or unused land. Sencondly, two classified images are calculated by band geometric algorithm pixel by pixel using programming. The class value of pixel in different year is the same, and then the processed pixel is zero, whereas the processed pixel is assigned to a certain value which represents change from the one land cover type to another during two years. Finally, statistic analyses of change information during two years are computed and the post classification comparison change detection image is outputted. It concludes that the largest change areas are exchanges of building, soil or unused land with grass land, and land covers in Baiyun district are changed mostly from 2000 to 2002.
The Software Design of Inverter Test System Based on VC and NI Controls
Authors: Cao Wen Lun , Chen Bei , He Yu Yao
Published: February 2011

The I/O performance test system of inverter is designed. ADlink PCI board and signal regulating panel are core of hardware platform. The software uses the mixed programs, that is, the graph control of Labview and Microsoft Visual C++. Based on the eight analog inputs, two analog outputs, three digital inputs and four digital outputs provided with specific application, we fulfill the following assignments: the dynamic monitoring of three-phase input current/voltage, DC-bus voltage and actual rotation speed, curve drawing and data storage. The computer could give the enable signal and analog speed of inverter, besides the failures are read and displayed. Finally the harmonic analysis and the balance analysis of three-phase current/voltage are realized.
Fabrication of Microfluidic Rapid Micromixer
Authors: Hsu Hsiang Chen , Liu Hsi Chien , Han Cheng Jiun
Published: February 2011

A microfluidic multi-cylindric rapid micromixer is fabricated in the present paper. The key features in the presented MEMS-based microchannel design are (1) micro pump (2) Y-junction type channel (3) cylindric obstacle (4) notch with the edge of sharp teeth. Two different fluids (DI water and red ink) were pumped and injected into Y-type channel, and the fluids were broken-up by a cylindric obstacle in the center of tapered microchannel. The chaotic convection occurs in the mixing channel behind the cylindric obstacle. The mixing index is defined to qualify the mixing efficiency, which demonstrates the outlet notch with sharp teeth along the sidewall plays an important role for mixing effects. The developed micromixer can enhance mixing using the mechanisms of diffusion and convection for wide range of Reynolds number (0.01<Re<100). Parametric studies for volumetric flow rate include the number of cylindric obstacles, the number of notches with sharp-teeth and the width of microchannel. Preliminary results demonstrate that the mixing index reaches the desired effect (<0.1) within 0.08 second when the inlet fluid velocity is 0.49992m/s, i.e. volumetric flow rate is 1200μl /min. The presented device is faster than most of reported micromixers.
Context-Aware Recommender System for Location-Based Advertising
Authors: Ahn Hyun Chul , Kim Kyoung Jae
Published: February 2011

Demand for context-aware systems continues to grow due to the diffusion of mobile devices. This trend may represent good market opportunities for mobile service industries. Thus, context-aware or location-based advertising (LBA) has been an interesting marketing tool for many companies. However, some studies reported that the performance of context-aware marketing or advertising has been quite disappointing. In this study, we propose a novel context-aware recommender system for LBA. Our proposed model is designed to apply a modified collaborative filtering (CF) algorithm with regard to the several dimensions for the personalization of mobile devices – location, time and the user’s needs type. In particular, we employ a classification rule to understand user’s needs type using a decision tree algorithm. We empirically validated the effectiveness of the proposed model by using a real-world dataset. Experimental results show that our model makes more accurate and satisfactory advertisements than comparative systems.
Risk Prediction of Environmental Impact Assessment - Actual Protein Project as an Example
Authors: Zhou Ji Hong , Wang Bin , Gou Xiao Tao
Published: February 2011

The risk assessment is an important part of the environmental impact assessment, and is a kind of evaluation personal safety caused by and environmental impact and damage during construction and operation of the predictability of emergencies caused by toxic and hazardous, flammable and explosive substances such as leakage and etc. In this paper, a actual project that may arise in the production process of the leakage of methanol make the source strength calculations and make predictions after the accident and the results show that: after an accident that there is no death, severe poisoning and moderately toxic concentration , but the plant will cause the surrounding air quality to exceed standard.
The Effect of Aging Heat Treatment on the Mechanical Properties of Cu-Al-Fe-(x) Alloys
Authors: Mi Guo Fa , Zhang Jin Zhi , Wang Hai Yan
Published: February 2011

Alloys were produced by casting of Cu-Al-Fe-Be and Cu-Al-Fe-Ni aluminum bronzes and aged. The microstructures and mechanical properties were evaluated. The results indicated that solution and aging treatment can significantly improve the plasticity of Cu-Al-Fe-Be and Cu-Al-Fe-Ni, while the strength and hardness remained in the quenched level. Extending the aging time can effectively enhance the mechanical properties of alloys, and the longer the aging time, the higher the electric resistance of alloys. According to the results, the mechanical properties of the Cu-Al-Fe-Be alloy can be improved remarkably by solution treatment for 120 min at 950°C, followed by aging treatment for 120 min at 350°C, and quenched. While the most suitable heat treatment for the Cu-Al-Fe-Ni alloy was solution treatment 120 min at 950°C, followed by aging for 120 min at 450°C, and quenched. The experimental result also suggested that the Cu-Al-Fe-Be alloy possessed higher hardness and tensile strength compared to the Cu-Al-Fe-Ni alloy.
Research on AODV Routing Protocol Optimization in Wireless Sensor Network
Authors: Tian Feng , Fan Li Lei , Sun Xiao Ping , Yao Ai Min , Liu Hua Yan
Published: February 2011

Energy balance of nodes in wireless sensor network is a difficult point. In this paper, analyze the performance of AODV routing protocol applied to the coal mine WSN environment which has less mobile nodes. Base on its characteristic of lacking of energy efficiency and optimal route selection considerations, an improvement of AODV routing protocol is carried out. Route discovery phase of the algorithm use a cost metric routing strategy, according to the energy level of nodes and the quality of links to calculate the routing cost, lower cost routing path will be selected. Between efficient routing and energy balance make an effective trade-off, improve the delivery rate of the network.
Improved Particle Swarm Optimization Algorithm for Mixed Integer Nonlinear Programming Problems
Authors: Li Hui Rong , Gao Yue Lin
Published: February 2011

This paper presents an improve particle swarm optimization algorithm for solving the mixed nonlinear integer programming problems. In this algorithm, the mixed nonlinear integer programming problems is converted into unconstrained bi-objective optimization problem by the dynamic bi-objective constraint handling methods and improved the velocity equation of PSO. Introduction of migration operator in order to overcome the premature phenomenon, retention to the better performance of infeasible particles according to the constraint violation in each iteration, it is effectively maintain the swarm diversity. Numerical experiments show that the proposed algorithm has faster convergence speed and better ability of global optimization.
Technical Efficiency Evaluation of Grid Corporations Based on the DEA Model
Authors: Kong Feng , Wang Wei
Published: February 2011

This paper describes the main contents of the evaluation of technical efficiency of electric power industry at home and abroad, the evaluation methods, and the development of it, and conducts an empirical analysis of the technical efficiency of the Grid in North China for the first time. This paper introduces the DEA to evaluate the technical efficiency of the Grid Corporations, and application of PSO to optimize on the DEA model. From the results of the evaluation of the technical efficiency of Sample Grid Corporation of China, We can conclude that you can better evaluate the technical efficiency of power companies by the combination of two ways, and can make clearer on their own to improve non-efficiency factors, thus conduct a comprehensive monitoring in the technical indicators and management indicators
Heating Steady Thermal Stresses in an Al1100/Ti-6Al-4V/SiC 2D-FGM Plane Four-Side Clamped Plate
Authors: Xu Yang Jian , Wang Ling Ling , Dong Li Wen
Published: February 2011

The steady thermal stress problems under linear temperature load on upper surface in an Al1100/Ti-6Al-4V/SiC 2D-FGM plane four-side clamped plate are analyzed by the FEM. When the variation of the material composition in y-direction is linear, the plane thermal stress distributions with the changes of composition shape distribution coefficient mx and porosity coefficient Ax in x-direction are obtained. The results show that compressive stresses of the metal side reduce and the compressive stresses increase on the ceramic side with the increasing of the mx. Except for lower surface, when mx =0.5, the thermal stress values of the 2D-FGM plane plate are smaller than those of the 1D-FGM plate. Compared with the maximum thermal stress value of the 1D-FGM plate, that of the 2D-FGM plane plate reduces by 815MPa. The thermal stress curve surface has more and more obvious convex trend and has smaller thermal stress gradient with the increasing of the Ax, especially it is when =0.1~0.5, =0.2~0.5, and other places have no variation. By comparison with the minimum thermal stress of Ax=0.0, that of Ax=3.99 reduces by 47.3% at =0.3. The results provide more comprehensive and concrete foundation of calculation for design and optimization of the 2D-FGM plane plate.
The Experimental Study of Thermodynamic Performance on R407C Air-Conditioner Hot Water Combined Unit
Authors: Hu Hong Song , Wang Fang , Yu Jian Zhong , Hao Wu
Published: February 2011

This paper analysis on the design and the test of an air-conditioner hot water combined unit using environmental friendly refrigerant R407C. Firstly the research status of the system is elaborated for air-source heat pump water heater simply. Then the principle and structure are described on an air-conditioner heat pump followed by a water heater at different running modes and different operation conditions. The hot water experiments of the unit in three seasons have been tested and researched in a multi-functional environmental chamber. Some analysis of the unit’s thermodynamic performance is carried out from the test data for improving such kind of machine afterward.
Influence Axial Vibration on Lateral Bending Deformation of Twist Drill in Machining Small Hole
Authors: Ma Li Jie , Wang Xi Bin , Feng Qi Gao , Liu Guan Jun
Published: February 2011

According to material mechanics theory and drilling practice, the equation of lateral bending deformation (LBD) of drill was built and the inclined angle of drill tip was solved when drilling small hole. And then the drilling test was done and the character of drilling force was analyzed. Based on this, the LBD of drill was studied. The result shows that, the rise of lateral force and thrust force will increase the inclined angle of drill tip in drilling process, and lateral force is the main factor of generating LBD. By choosing suitable axial vibration parameter, axial vibration drilling can reduce the LBD of drill and improve the dimensional accuracy of hole evidently.
Getting Rid of the Wires: Curved Layer Fused Deposition Modeling in Conductive Polymer Additive Manufacturing
Authors: Diegel Olaf , Singamneni Sarat , Huang Ben , Gibson Ian
Published: February 2011

This paper describes an additive manufacturing technology that has the potential to print plastic components with integral conductive polymer electronic circuits. This could have a major impact in the fields of robotics and mechatronics as it has the potential to allow large wiring looms, often an issue with complex robotic systems, to be printed as an integral part of the products plastic shell. This paper describes the development of a novel Fused Deposition Modeling (FDM) process in which the layers of material that make up the part are deposited as curved layers instead of the conventional flat layers. This opens up possibilities of building curved plastic parts that have conductive electronic tracks and components printed as an integral part of the plastic component, thereby eliminating printed circuit boards and wiring. It is not possible to do this with existing flatlayer additive manufacturing technologies as the continuity of a circuit could be interrupted between the layers. With curved-layer fused deposition modeling (CLFDM) this problem is removed as continuous filaments in 3 dimensions can be produced, allowing for continuous conductive circuits.
Study on Bonding Characteristic of Mixed-Type Chloride Ion in Sulphoaluminate Cement
Authors: Zhao Jun , Cai Gao Chuang , Gao Dan Ying
Published: February 2011

The binding properties of chloride ion of sulphoaluminate cement and portland cement were studied in different age,different water-cement ratio and different chloride ion content. The results show that binding rate tends to increase as the age and water-cement ratio increase for above two type cements. But the trend is opposite with the increase of total amount of incorporation chloride ion(TAIC), and the early strength of sulphoaluminate cement decreases slightly.
Disaster Management and Response Strategy in Urban Public Safety of the U.S.A
Authors: Ye Mao Sheng , Jin Qin Xian , Wang Yu Tian
Published: February 2011

This presentation is intended to provide response managers and others with an understanding of national preparedness and response system that is in place to address emergencies involving industrial accidents, natural disasters, public health and social securities. This paper describes a list of important competencies that have been identified and used for effective disaster response and the management and response procedures of a typical incident in USA, taking 2008 flood in Illinois as an instance. Using the concept of National Incident Management System (NIMS) and Incident Command System (ICS), Incident Management Teams (IMTs) were trained and established in Illinois. These organizations were deployed into various positions so as to assist the governmental organizations at different levels in planning, commanding, decision making, etc.
Ranging Technology for Accurate Localization in Short-Range Wireless Networks – A Comparative Study
Authors: Zhang Yuan , Liu Shu Tang , Liu Yue
Published: February 2011

Localization capability is usually required and designed for wireless networks. Although many localization algorithms have been proposed, the refinement issue of guaranteeing the location accuracy is still in its early stage of development. This paper compares different ranging technologies for localization measurement. Specifically, we analyze infrared, ultra sonic, radio frequency and ultra wideband as different choices. After a comparative study the paper recommends ultra wideband as the best candidate for accurate range-based localization system in the short-range wireless network scenario.
A Kind of NLP Algorithm with NCP Function
Authors: Jiang Ai Ping , Huang Feng Wen
Published: February 2011

In this paper, two modifications are proposed for minimizing the nonlinear optimization problem (NLP) based on Fletcher and Leyffer’s filter method which is different from traditional merit function with penalty term. We firstly modify one component of filter pairs with NCP function instead of violation constrained function in order to avoid the difficulty of selecting penalty parameters. We also proved that the modified algorithm is globally and super linearly convergent under certain conditions. We secondly convert objective function to augmented Lagrangian function in case of incompatibility caused by sub-problems.
An Optimizing Method of Competitive Neural Network
Authors: Men Hong , Liu Hai Yan , Wang Lei , Pan Yun Peng
Published: February 2011

This paper presents an optimizing method of competitive neural network(CNN):During clustering analysis fixed on the optimum number of output neurons according to the change of DB value，and then adjusted connected weight including increasing ,dividing , delete. Each neuron had the different variety trend of learning rate according with the change of the probability of neurons. The optimizing method made classification more accurate. Simulation results showed that optimized network structure had a strong ability to adjust the number of clusters dynamically and good results of classification.
Free-Form Surface Five-Axis Machining Tool Path and Tool Posture Simultaneous Multi-Objective Optimization Theory Research
Authors: Cao Shu Kun , Song Li , Song Kai Feng , Lv Jie , Chen Xiu Sheng
Published: February 2011

In view of all sorts of questions existing in CNC machining, such as machining vibration, so proposed a new simultaneous multi-objective optimization algorithm on free-form surface five-axis machining tool path and tool posture based on constant scallop height. In the algorithm, we first complete the surface fitting on the base of feature points obtained. Secondly calculate principal curvatures of the surface, select tools, and at the same time generate tool axis vector in the current cutter-contact point tool axis. Once again get the maximum spacing and surface curvature in accordance with the tool effective cutting radius, discrete into cutter-contact point, and calculate the cutting depth to adjust the machine feed rate. And finally connect adjacent curve path using the diagonal to achieve a continuous cutting scallop height tool path. This algorithm can achieve the goals such as the same precision, improving processing efficiency, reducing the number of tool cutting in and out, reducing cutting vibration and tool wear and so on. That is the algorithm can achieve simultaneous multi-objective optimization of the free-form surface NC machining finally.
Sliding Mode Predictive Control Method for Attitude Control of Networked Launch Vehicle
Authors: Chen Yu , Li Guang , Dong Chao Yang , Wang Qing
Published: February 2011

A novel adaptive fuzzy sliding mode predictive control (AFSMPC) method for solving the networked launch vehicle attitude control system with network-induced delay, uncertain parameters and outer disturbances is proposed in this paper for the attitude stabilization of the networked launch vehicle control system. The proposed sliding mode surface includes a predictor to compensate for the network-induced delay of the NCS. Then, for the networked Launch vehicle attitude control system with uncertain parameters and outer disturbances, a total sliding-mode control system is proposed, which is designed without the reaching phase of a conventional sliding-mode control. In order to attenuate the chattering phenomena brought by the proposed control, a fuzzy logic system is designed to mimic the good behavior of a total sliding-mode predictive control system. Finally, Simulation results show that the proposed control scheme is effective.
An Energy Efficient Geocast Routing Protocol Based on a Defer-Time Control Function for Vehicular Ad-Hoc Network
Authors: Lin Bon Yeh , Chen Chi Hua , Lo Chi Chun
Published: February 2011

The Vehicular Ad-hoc NETwork (VANET) requires a suitable routing protocol to accommodate its special characteristics (e.g., high mobility, short-lived links, and fast-changing topology). There are many routing algorithms which are developed for transmitting information more quickly and cost-effective. In this paper, we propose a routing protocol which relies on Defer-Time Control Function (DTCF) to reduce the hop count, the transmission delay, and the probability of collisions during transmission. We provide an extensive analysis of DTCFs and choose the power-law model for routing protocol optimization. The function can be adjusted dynamically according to the distribution of the neighboring nodes (vehicles) of each hop. We also propose a mechanism to prevent the selected next-hop leaves the transmission range.
Study of Elastic-Viscoplastic Analysis and Water Damage Mechanism for the Asphalt Pavement
Authors: Wang Jin Long
Published: February 2011

Analyze and study the deformation and damage of asphalt pavement which is under the combined action of seepage and vehicle payload by the finite element analysis software ANSYS. Through the study and analysis of the deformation and damage of the asphalt pavement in the three cases of seepage, vehicle payload, and the combined action of seepage and vehicle payload, the study shows: the damage of the asphalt pavement emerges mainly under the vehicle payload, but after the seepage, the damage under the combined action of seepage and vehicle payload will be more serious.