bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of Frequency Synchronization Error on SAR Imaging and ATI Moving Target Detection
Authors: Li Shao Bin , Chen Zheng , Hao Zhi Ya , Gao Jian Jun
Published: July 2012

The influence of frequency synchronization error on SAR imaging and moving target detection using Along-Track Interferometry (ATI) is researched. The expression of frequency synchronization error and its influence on SAR imaging is analyzed in detail firstly. Then, the basic theory of ATI to detect moving targets is introduced in brief, the ATI in range-Doppler domain is given and the influence of frequency synchronization error on the interferometric phase in range-Doppler domain is analyzed. The influence of three kinds of frequency synchronization error is given: the main lobe shift from the inherent frequency error, the main lobe expansion from the linear frequency error, and the sidelobe rise from the sinusoidal frequency error. Simulation is used to confirm the analysis.
Research of the Numerical Control Machining Simulation
Authors: Xie Xia , Xu Ai Fen , Lu Xue Cheng , Wang Bin
Published: July 2012

In this paper, the concept, development status and trend of NC machining simulation technology were reviewed and its four key technologies were emphatically introduced, which were geometric modeling technology, NC code translation, entity collision detection and the material removal process simulation respectively.
Modeling and Analysis of Multi-Objective Automatic Balance System in the Hydrometallurgical Process
Authors: Zhou Ke Liang , Jiang Yu Lan , Huang Jin Lin , Yan Bin
Published: July 2012

During the hydrometallurgical production process, there are many towers working at the same time. In order to improve production efficiency, we need to control the level height of every tower. Takes example for 6 towers, do research on the level control system in metal ions production process. According to the theory of materials balance, the mathematic model of the system are established. Programmed the mathematic model by Matlab. In order to make the level of each tower at the same height, work out how many adjust times needed and how much adsorbate every tower inflow and outflow each time. Then analysis the data results of error and variance, which have confirmed the feasibility and rationality of the level automatic balance system model established in this paper.
Coal Mine Gas Prediction Model Based on Particle Swarm Optimization Algorithm
Authors: Ai Li , Cheng Jia Tang , Xu Shao Kun
Published: July 2012

For traditional methods for coal mine gas emission prediction accuracy is not high, an adaptive mutation particle swarm optimization neural network approach is introduced. The algorithm increases the mutation operation in iterative process, and adaptive adjusts mutation probability of the size, in order to enhance the ability to jump out of the local optima. The simulation results show that the method can be better predicted coal mine gas, has a certain practicality.
Image Fusion Method for Strip Steel Surface Detect Based on Bandelet-PCNN
Authors: Zhang Xu , Yan Yun Hui , Chen Wen Hui , Chen Jun Jun
Published: July 2012

To solve the problem of the pseudo-Gibbs phenomena around singularities when we implement image fusion with images of strip surface detects obtained from different angles, a novel image fusion method based on Bandelet-PCNN(Pulse coupled neural networks) is proposed. Low-pass sub-band coefficient of source image by Bandelet is inputted into PCNN. And the coefficient is selected by ignition frequency by the neuron iteration. At last the fused image can be got through inverse Bandelet using the coefficient and Geometric flow parameters. Experimental results demonstrate that for the scrip surface detects of scratches, abrasions and pit, fused image effectively combines defect information of multiple image sources. Contrast to the classical wavelet transform and Bandelet transform the method reserves more detailed and comprehensive detect information. Consequently the method proposed in this paper is more effective.
Design and Implementation of Temperature Control System for High-Frequency Heating Furnace Based on ARM11
Authors: Gong Shang Fu , Shi Cheng Hu , Zhang Ku Nao , Wang Chan
Published: July 2012

Aiming at special requirements of temperature control of high-frequency heating furnace, an optimization algorithm that is optimized by adaptive scheduling strategy is proposed by integrating the simulating human intelligent control algorithm and the fuzzy proportion integral derivative control algorithm. Using ARM S3C6410 & WinCE 6.0 platform as the development platform and Visual Studio 2005 as the development tool, a hardware and software system for high-frequency furnace is designed based on technologies of embedded systems, control and communication. This system can control well the temperature of heating objects in a high- frequency heating furnace.
The Design and Realization of Apple Orchard Intelligent Monitoring System Based on Internet of Things Technology
Authors: Feng Chen , Wu Hua Rui , Zhu Hua Ji , Sun Xiang
Published: July 2012

In order to reduce management costs of apple orchards, improve product quality of apples, and provide detailed, comprehensive and accurate electronic information for planting works, pest warning, and production quality tracking of apples, with the application of wireless sensor technology, by applied Zigbee technology, GPRS technology and IOT technology, on the basis of realization of apple orchard environment monitoring, this paper provides a design scheme of apple orchard intelligent monitoring system based IOT, and taking the modules of dynamic monitoring, farming suggestion, planting decision making, and information push in the system as examples, it explains the specific methods of applying IOT to the realization of apple orchard monitoring management in detail. This apple orchard intelligent monitoring system provides not only detailed monitoring data of apple growth for vegetable and fruit agricultural cooperatives, but also decision making support for farming. The research of the system will be helpful in promoting the extension and application of IOT technology in agricultural production.
Equivalent Condition for Poles Assignability via Decentralized Static Output Feedback
Authors: Shi Hai Bin , Qi Li
Published: July 2012

This paper deals with difficulty of decentralization and presents an equivalent condition for poles assignability via decentralized static output feedback based on Kronecker product and vectorization. This condition is an equation regarding a nonsingular matrix variable and doesn't concern feedback gains. Consequently, an explanation is given for decentralized assignability, and results of centralized case are also obtained as corollaries of the proposed condition.
Built-In Self-Test Scheme for All-Digital Phase-Locked Loops
Authors: Cai Zhi Kuang , Huang Kai , Yang Jun , Shi Long Xing
Published: July 2012

This paper presents a low-cost Built-In Self-Test (BIST) scheme, which is based on the principle of parity check code. The proposed circuit is consisted of a XOR network, a frequency decrease module, a BIST controller and a fault detector module. Different from the previous methods of PLL BIST, digital signals from the divide-by-N are grouped as transmission codes, and parity check codes are produced synchronously by the BIST controller. Then the results of parity checking are imported to the fault detector and final test results are generated. Purely digital design flow is adopted and hybrid faults models are used to evaluate the efficiency of the circuit. Experimental results indicates that the proposed method can provide the highest test coverage and lower area overhead, which are 98.3% and 4.2%, respectively.
The Design of Sliding Decoupling Controller for AIR-TO-AIR MISSILE at High Angle of Attack Based on DDFC
Authors: Zhang Jing Guo , Ren Ya Fei , Luo Xu Tao , Liang Xiao Geng
Published: July 2012

The asymmetric vortex and vortex breakdown lead to strong inter-channel coupling and non-linear characteristics when air-to-air missile flies at high angle of attack. Firstly, this essay establishes a coupling characteristics mathematical model of the missile. And then, it gives a decoupling control method based on DDFC (Direct Dynamics Feedback Compensation) theory. At last, a new decoupling controller is designed combined with sliding variable structure control theory. The simulation shows that the performance of decoupling and command responses of this designed control system is quite good.
Power-Weight Allocation Algorithm for OFDM-Based Cognitive Radio System
Authors: Yang Xiao Long , Ma Lin , Tan Xue Zhi
Published: July 2012

Cognitive Radio (CR) has been proposed as one of the most promising technologies to provide efficient utilization of the limited wireless spectrum. In this paper, we investigate the power allocation for CR system based on orthogonal frequency division multiplexing (OFDM), and an improved allocation algorithm called power-weight algorithm is proposed. This algorithm performs initial allocation via Lagrange multiplier method, and then accomplishes second allocation based on power weight obtained in initial allocation. The analytical results reveal that the total transmission rate of all subcarriers is much closer to the optimal algorithm (i.e. the greedy algorithm) than the water-level algorithm, the Krongold algorithm and adaptive water-filling algorithm, subject to transmit power constraint and bit error rate (BER) constraint. These algorithms are all based on water-filling thought. Finally, simulation results verify our analysis.
Congruence and Simultaneity Judgment with a Single Multisensory Target: Preliminary Results
Authors: Li Qi , Langsford Steven , Yang Jing Jing
Published: July 2012

The presence of congruent features may suggest to the brain that stimuli in different modalities are due to a common cause. Previous work has presented conflicting results regarding the impact of congruence on simultaneity judgments, widely thought to be related to judgments of common cause. Here, a novel experimental paradigm using a single changing multi-sensory object is described, with the goal of contrasting results obtained using a single multi-sensory target with those obtained from previous work using arrays of moving dots and staggered asynchronous pairs of targets. Some preliminary results from a pilot validating the experimental procedure are discussed.
Automatic Control Technology in Smart Power Generation
Authors: Zhang Wei , Li Lei
Published: July 2012

Automation of power generation and its control process is inevitable trend and requirement. In construction of smart grid, clean energy is a significant indicator of smart grid, and energy conservation and emission reduction is a major research task. Automatic control technology in power generation especially in energy conservation and emission reduction is briefly introduced in the paper. In power plant, there are some problems to solve in desulphurization and water feeding, and the application of automatic control technology could solve or improve the problems in some degree.
Research and Design of Quantitative Casting Control System for Lead Anode Plate
Authors: Liang Ling , Zhou Ke Liang , Liang Jian Wei , Zhu Wen Xing
Published: July 2012

In this paper, taking the quantitative casting system for lead anode plate as the object of study, develop a control system based on the fieldbus and fuzzy control. Introduce the process and control principle of the lead anode plate casting, and establish the quantitative pouring control system from two aspects as the designs of hardware and software equipment.The system adopts the PROFIBUS-DP fieldbus technology and uses SIMATIC PLC as the master station to structure the casting control system. It describes the realization and simulation of the fuzzy self-tuning PID control algorithm in quantitative casting system.The simulation results show: Fuzzy - PI control scheme has a better control effectiveness than the traditional PID control system,for a smaller control response curve overshoot and error, a shorter response time and restraining the outside interference to the system and the instability of casting flow.
Non-Fragile Passive Control for Nonlinear Singular Systems with Time-Delay and Uncertainties
Authors: Li Hong , Shi Shu Hui , Wu Ou
Published: July 2012

This paper focuses on the problem of non-fragile robust passive control for a class of nonlinear singular systems which contain structure uncertainties and time delay. A memorial state feedback controller is considered, and the controller is constructed such that closed-loop systems are generalized quadratically stable and passive with dissipation. The algorithm is given for obtaining the maximum dissipation, at the same time, the maximum guaranteed dissipation controller is proposed. Numerical example is presented to show the validity and applicability of the proposed method.
Preparation and Microwave Absorbing Properties of Iron Oxides/Carbon Nanotubes Compounds
Authors: Ma Chuan Guo , Zheng Hai Jun , Li Xiao Ming , Gao Liang
Published: July 2012

A Series of iron oxides/CNTs compounds were prepared using a method of impregnation with iron nitrate solution and followed thermal decomposition. The compounds were characterized by the means of scanning electronic microscope, X-ray diffraction and thermogravimetic analysis. The dielectric and microwave-absorbing properties of EP composites containing the different compounds were further measured in a specific frequency range. The results show that: CNTs show reduction at a high temperature, and can make products of the thermal decomposition of iron nitrate produce iron oxide nanoparticles with different valence states at different temperatures. With increasing decomposition temperature, the iron oxides in CNTs composites in turn are Fe2O3, Fe3O4, FeO and Fe. Compared with pure CNTs, these iron oxides/CNTs composites have better microwave absorbing properties in the wavebands of 7.5GHz ~ 15GHz and 26.5GHz ~ 40GHz. Among those iron oxides /CNTs compounds, Fe3O4/CNTs compound has the best microwave absorbing property.
Emerging Scope of Hybrid Solar Cells in Organic Photovoltaic Applications by Incorporating Nanomaterials
Authors: Gupta Nishu , Gupta K.M.
Published: July 2012

In recent years, semiconductor nanomaterials have been extensively studied and reports are available for their preparation methods, physical and chemical properties of nanoparticles and their characterization techniques. Because of their potential applications, ZnS nanoparticles are recently major area of research. It is an important inorganic material for a variety of applications including photoconductors, solar cells, field effect transistors, sensors, transducers optical coatings and light-emitting materials. Inorganic nano-particles have found potential application in various electronic devices. Synthesis, shape and size control are important issues for nano-particles research. Various nano-structured materials have found potential applications in optical and electrical devices such as photoconductors, LEDs, solar cells, field effect transistors, optical coatings etc. ZnS has wide band gap ranging from 3.5 to 3.8 eV at room temperature and the band gap can be tuned in the UV region by controlling the size of the nano-particles. In the present work we have studied the synthesis of ZnS nano-particles, their characterization to investigate various properties such as size, structure, band gap and luminescence via different characterization tools. The particles were then used as acceptors for fabrication of organic hybrid solar cells.
Thermomechanical Response of Commercially Pure Titanium under Large Plastic Deformation at High Strain Rates
Authors: Gao Chong Yang , Lu Wei Ran
Published: July 2012

By using a dislocation-based plastic constitutive model for hcp metals developed by us recently, the dynamic thermomechanical response of an important industrial material, commercially pure titanium (CP-Ti), was described at different temperatures and strain rates. The constitutive parameters of the material are determined by an efficient optimization method for a globally optimal solution. The model can well predict the dynamic response of CP-Ti by the comparison with experimental data and the Nemat-Nasser-Guo model.
Platinum Extraction from Spent Catalysts by TOPO Utilizing RSM Technique
Authors: Nejad Hesam Hassan , Kazemeini Mohammad , Fattahi Moslem
Published: July 2012

In this research, data on liquid-liquid extraction of platinum from commercial spent catalysts by trioctylphosphine oxide (TOPO) in toluene were experimentally obtained. Alkaline metal salts were used to optimize the separation process. Best Salting-out effect was obtained by KCl which extracted up to 90% of platinum utilizing TOPO. Furthermore, extraction percentages of Pt and Al depending upon different factors were investigated. It was observed that the extraction process was kinetically fast and achieving the equilibrium time took less than 30 seconds. Optimized points obtained utilizing response surface methodology (RSM) by the “Design Expert” software in order to minimize the separation factor of platinum to aluminum.
Influence of Lightweight Aggregates and GRP By-Product Powders on the Properties of Self-Compacting Concretes
Authors: Corinaldesi Valeria
Published: July 2012

Self-compacting lightweight concrete was developed to attain good workability, high compressive strength (at least 50 MPa), minimum cracks, and low specific weight (less than 2000 kg/m3), as well as low elastic modulus (about 30 GPa). The attention was also focused on sustainability of this construction material, which was improved by using in the mixture both GRP industrial by-product as filler and artificial (light expanded clay) or recycled (demolished concrete) as coarse aggregates replacing natural gravel. Satisfactory, if not excellent, results were obtained from the collected experimental data.
Study on Structure and Properties of Polyacrylonitrile Fiber Modified by Hydrazine Hydrate
Authors: Jia Zhao , Yang Yan Gong
Published: July 2012

In this study, the flame-retardant PAN fiber with good moisture absorption, good mechanical properties and better thermal properties has been prepared by blending solution of sodium hydroxide and hydrazine hydrate. FTIR spectra presented that new amide and cyclization-crosslinked pyridine group band peaks appeared. X-ray diffraction showed that the the crystal structure of PAN fibers has been converted from quasicrystalline structure into partially crystallized structure after modification treatment. SEM micrographs indicated that the original longitudinal surface microgroove has changed to layered structure by surfical etchant.
Effect of In, Bi, Zn Binary-Metal Dopings in Sn-0.7Cu Solder on its Electrochemical Corrosion Charateristics in 3 wt.% NaCl Solution
Authors: Hua L. , Zhang L.
Published: July 2012

Effect of In, Zn, Bi binary-metal dopings in Sn-0.7Cu (SC) solder on the electrochemical corrosion characteristics of SC solder were conducted, the potentiodynamic polarization test coupled with SEM analyses had been widely used to study the corrosion properties of alloy materials. The results showed that when both In-Zn binary-metal doping was increased, the corrosive current density (Icorr) increased, which proved that anti-corrosion capacities of Sn-0.7Cu solder decreased with In-Zn doping increasing, the affected order was Zn>In. When both In-Bi binary-metal doping percent were increased, the corrosive current density (Icorr) decreased, the affected order was In>Bi. When both Zn-Bi binary-metal doping percent were increased, the Icorr increased, the affected order was Zn>Bi. There was collaborated function on SC solder for the three metals. The synthesized result showed that the sequence of In, Bi, Zn affecting on corrosion of SC solder was that Zn>In>Bi, which provide a support data to improve soldering reliability in electronic packagings.
Experimental Study of Leaching Scandium from Chloride Dust
Authors: Liu Song Li
Published: July 2012

Scandium is concentrated in the dust during TiO2 chlorization. The dust can be used as a raw material from which Scandium is extracted. Scandium leaching conditions such as leaching acid concentration , liquid-solid ratio , leaching temperature and leaching time is investigated with chemical analysis through the orthogonal experiment. The results show that the optimum leaching conditions is: chloride dust particle size is 44 μ m, leaching acid concentration is 15%, liquid-solid ratio is 2:1, leaching temperature is 28 °C, leaching time is 1 h.
Comparison of As-Cast Microstructures and Solidification Behaviours of Mg-Zn-Al Ternary Magnesium Alloys with Different Zn/Al Mass Ratios
Authors: Yang Ming Bo , Li Hong Liang , Cheng Ren Ju
Published: July 2012

The as-cast microstructures and solidification behaviours of Mg-Zn-Al ternary magnesium alloys with different Zn/Al mass ratios were investigated and compared. The results indicate that, when the Zn/Al mass ratio is less than 2, the alloys are composed of a-Mg and Mg32(Al,Zn)49 phases, and with the increase of the Zn/Al mass ratio, the amount of the second phase gradually decreases and its distribution changes from continuous net to quasti-continuous net. However, when the Zn/Al mass ratio is more than 2, the alloys are composed of a-Mg, Mg32(Al,Zn)49 and MgZn phases, and with the increase of the Zn/Al mass ratio, the amount of the second phase gradually increases and its distribution changes from quasti-continuous net to uniform particles. In addition, the onset and the peak temperatures of the second phase transformation for the alloys with the Zn/Al mass ratio of less than 2, are higher than that of the alloys with the Zn/Al mass ratio of more than 2, which results in the different reactions during the second phase transformation and the different types of the second phase.
Study of Lightweight Mortars Made of Wooden Waste
Authors: Corinaldesi Valeria
Published: July 2012

In this work an attempt was made to reuse wooden waste for producing lightweight mortars by replacing natural sand. In fact, manufacturers of wooden product and furniture generate sawdust and offcuts. These are produced by cutting, drilling and milling operations where wood is removed from a finished product; they are often collected in filter bags or dust collectors. Three different percentages of substitution have been tried: 2.5%, 5% and 10% by volume of sand. Wooden waste was always pre-soaked in water and sometimes in calcium hydroxide aqueous solution in order to obtain wood mineralization before adding it to the mortar mixture. Mortars containing wooden waste were characterized by means of compression and bending tests, free drying shrinkage and thermal conductivity measurements.
Evaluation of Piezoresistivity in Heat Treated 5A06 Al-Mg alloy Due to Applied Stress Using Eddy Current Method
Authors: Abdul Shakoor , Zhou Zheng Gan
Published: July 2012

Eddy current method can be used for non-destructive assessment of residual stress. In order to relate electrical conductivity change to the residual stresses in the welded joints, piezoresistivity of 5A06 has been investigated using samples heat treated at 2500C and 4000C. These samples represent weld zones with different thermal exposure. A directional eddy current probe with a Hall Effect sensor was used to evaluate stress coefficient of electrical conductivity due to applied uniaxial tensile load on the samples. The electromagnetic forward model was solved using FEM package and linear conductivity inversion was formulated to express probe output in terms of electrical conductivity. The piezoresistivity coefficients of samples, calculated from the derivative of stress-conductivity relation, were compared. The results indicate that coefficients vary inversely with annealing temperature.
Experiment Study on Vibration in Milling of Stainless Steel 304 in Time Domain and Frequency Domain
Authors: Shen Yang , Chen Yong Jie , Fang Hai Tao , Pang Jia
Published: July 2012

Vibration is a common phenomenon in cutting process, which is harmful for machining quality and machine tools. This paper focused on the occurrence and characteristics of vibration of the cutting tool and workpiece by changing cutting speed in milling of stainless steels 304. Vibration acceleration signals of both the cutting tool and the workpiece were sampled and analyzed in time domain and frequency domain. Vibration noise and vibration mark were used to judge the occurrence of violent vibration. In the experiments, both self-excited vibration and violent forced vibration were found at different value of cutting speed. Violent forced vibration was easy to be induced owing to interrupted continuous impulsion cutting.The Maximum amplitude of vibration acceleration signals varied with the cutting speed changing. With the cutting speed increased, the probability of violent vibration increased. Bigger amplitude of vibration will not always lead to vibration mark on surface of workpiece, obvious vibration mark only occurred when n=600 r/min and 700 r/min. In order to reduce the impact of violent vibration on machining quality, more attention should also be paid to the static and dynamics characteristics of the cutting tools and workpiece in milling of stainless steels.
Cutting Tool Geometry and Parameters Effects on the Force and Temperature in Turning Steel 1040 Using Finite Element Analysis
Authors: Abdullah Asaad A. , Naeem Usama J. , Xiong Cai Hua
Published: July 2012

In recent years, applications have been proven finite-element method (FEM) in metal-cutting operations to be effective process in the study of cutting and chip formation. In this study, the simulation results are useful for both researchers and machine tool manufacturers for improving the design of cutting parameters. Finite-element analysis (FEA) that used in this study of simulation the cutting parameters and tool geometries effects on the force and temperature in turning AISI 1040. The simulation parameters that used in this study are cutting speed (75 - 300 m/min),feed rate (0.2 mm/rev), cut depth (0.75-1.5 mm), and rake angle (0-20 °). The results of cutting forces were (240 – 520 N), the temperature were (300-420 °C), and the heat rate (14202.3-83772.8 W/mm3) on the cutting edge. The simulation process also show that the increase of cutting speed leads to decrease in the cutting forces, while it has increasing in temperature, and heat rate. Also, the results show that the increase of cutting depth associated increase the cutting force only.
Prediction of Reliability Model for CNC Machine Tool Based on Exponential Smoothing Model
Authors: Yang Zhao Jun , Wang Yin Kai , Chen Fei , Wang Yang , Li Xiao Bing , Zhao Hong Wei , Hao Qing Bo
Published: July 2012

In order to manage equipment maintenance work and reduce enterprise cost, a new prediction method of reliability parameters is proposed based on failure time in this paper. The reliability model was built based on failure time, and the reliability parameters were obtained by the empirical modeling method. Then parameters from historical data were used as predictive model parameters, which applied the exponential smoothing methods to establish predictive models based on historical data. Finally, prediction model of reliability was built by the predicted parameters used the above method. With failure data of CNC machine tool as an example, analysis of living example indicated that the proposed method acted effectively, and the precision of prediction is quite ideal, which help consumers of CNC machine tool provide the decision support of equipment maintenance management; meanwhile, strengthen the enterprise's competitive power to some extent.
Gear Faults Diagnosis Based on Nonlinear Blind Source Separation
Authors: Wang Xiao Wei , Shi Lin Suo , Chen Shuang , Li Hui , Zhang Wei
Published: July 2012

The nonlinear blind source separation is a practical and effective method in processing mechanical vibration signal, but it has the limitation which learning rate is fixed. It will take a long time for iterative parameters to get convergence. In this paper, a variable rate nonlinear BSS is proposed. The learning rate of the algorithm is adjusted based on iterative error in the different stopping iterating time and inverse proportion. The proposed algorithm increasing the efficiency of the nonlinear BSS and de-noising the vibration signals. Experiment on gears shows that the signal gained by the method more impersonality represents the gear condition
Mechanical Failure Analysis of Aircraft Alternator Based on Fault Tree and Case Reasoning
Authors: He Yong Bo , Dou Sheng Liang
Published: July 2012

Aircraft alternator is in the central position of the aircraft AC power system. The existing troubleshooting process is complex and tedious. In this paper, the aircraft alternator fault tree is established, and a fault example of under-voltage condition is analyzed in-depth qualitative and quantitative. According to the importance degree, the order of troubleshooting is obtained, making the fault diagnosis fast and effective. In order to overcome the limitation of the fault tree analysis, case-based reasoning is combined, making the fault diagnosis more comprehensive and accurate.
Study on the Fatigue Small Cracking Behavior of 6A02 Aluminum Alloy
Authors: Mu Zhi Tao , Chen Ding Hai , Wei Xing , Ding Wen Yong
Published: July 2012

This paper is to reveal the small crack growth law of 6A02 aluminum alloy specimen by SEM in-situ experiment. The Nisitani H. formula for crack propagation is modified by SEM in-situ experimental results. The effect of corrosion is emphasized in small crack growth law of 6A02 specimen by introducing of corrosive factors. The fitting curve between corrosive factors and corrosive time is revealed. It would provide a theoretical foundation for the corrosion fatigue damage of 6A02 aluminum alloy.
Fracture Analysis of High Chromium Cast Iron Roll on CSP Mill
Authors: Wu Guo Sheng , Wang Yu Tao
Published: July 2012

A roll barrel breakdown accident took place on CSP mill. After investigating of the accident scene and the roll service condition, analysing the barrel fracture and sampling tests, proved that main cause for the roll breakdown was unusual and there appeared a strip-like crack on the boundary layer resulting from the initial flaws extending along the roll circle direction; furthermore, the flaws caused fatigue breakage along the roll inner cross section, which resulted in the barrel breakdown.
The Strengthening of the Bridge Deck Plates by P.B.O-F.R.C.M Composite Materials
Authors: Anania Laura , Badalà Antonio , D’Agata G.
Published: July 2012

This paper demonstrates how advanced composite materials as F.R.C.M. (fiber reinforced cementicius matrix) can offer high advantages for repairing ageing infrastructures. The FRCM strengthening system can be considered alternative to the well-known fibre-reinforced polymers (FRP) system. The FRCM system, in fact, permits the elimination of some disadvantages related to the use of organic resin, such as lack of fire resistance and low compatibility with the concrete substrate. In this study, a data comparison between non-reinforced and reinforced models is discussed. The specimens simulated a part of a bridge deck to repair or strengthen. The samples were no. 6 plates 70x70 cm ² long and 10 cm thick realized by a mix design concrete [1] of 30/35 class and reinforced by steel bars. The strengthening system consists in applying the composite biaxial sheet at the intrados of the deck in two layers orthogonal to each other.
Simulator of Hydraulic Supercharger Based on Virual Instrument
Authors: Hu Chun Xiao , Zhu Hua Bing , Ye Hui Juan
Published: July 2012

In order to build a platform for overhaul and simulation training of CCIS (Command Control Information System), the simulation model of the hydraulic supercharger was established. By the model the simulator of hydraulic supercharger was designed and developed based on virtual instrument technology and SCM (single chip microcomputer) technology, the software of the simulator which was designed by the LabWindows/CVI provided a virtual interface and the hardware of the simulator which was developed with the SCM system gave the correct signal. As a result, when the simulator of hydraulic supercharger was connected to the CCIS, the simulation result was realized to be consistent with the real hydraulic supercharger.
A Virtual Reality Environment for Upper Limb Rehabilitation Training and Simulation
Authors: Hu Wen Qiang , Gu Xi Qian
Published: July 2012

Stroke survivors and persons with disabilities age progressive decline in health and medical status can challenge the adaptive resources required to maintain functional independence and quality of life. Because of the lack of physiatrist, most individuals lose ability in body step by step and suffer physically and psychologically. For this reason, actions to recovery the patient’s freedom and mobility are imperative. This paper reports a solution to help patients to complete the rehabilitation without physiatrist. This solution considers virtual (VR) and augmented reality (AR) techniques to construct one training system with which patient completes the rehabilitation. And the proposed system is applied for supplying environment, guiding movement and providing information. Thus, this article reports on a solution designed by the authors to help patients during rehabilitation.
On the Modeling of Anisotropic Elastic Ground Structures on an Elastic Anisotropic Basis
Authors: Turashev Agzhaik Seyitkozhanovich
Published: July 2012

As the matter of fact, the soil in all models of the base is considered as a homogeneous isotropic body, ttherefore, existing models of isotropic elastic strata near the buildings does not allow to consider the actual properties of soils: their small-layered structure, the inclination of layers, anisotropy and heterogeneity, in addition it does not take into account the location of objects relative to the plane of the strike of the inclined layers. This article describes the anisotropic (transtropic) calculated elastic model of a complex system of "ground-foundation-structure basis", which most adequately reflects the characteristics of deformation and taking into account the diversity of the elastic properties in different directions relative to the plane of small fibers.
The Motion Modeling and Simulation of the Swash-Plate Engine
Authors: Liang Wei Ge , Zhang Zhen Shan , Zhu Rui
Published: July 2012

In order to conduct a comprehensive analysis and optimization improvements of the swash-plate engine, it is necessary to analyze and discuss the motion of the swash-plate completely. Based on the motion model of the piston and the connecting rod of the engine, the motion tendencies were simulated. The results suggest the circumferential distance can cause vibration, noise, and rough running of the piston and the connecting rod in the operating process. Besides, the inertia forces/moments and the unbalanced motion are considered to be the main sources of the vibration and noise. On the basis of the results, we propose a “∞” guide groove, which can reduce the vibration and noise of the swash-plate engine, to improve the kinematical parameters.
Numerical Simulation and Infrared Measurement of Welding Temperature Field for T-Joint
Authors: Jia Li , Zou Yong , Zou Zeng Da
Published: July 2012

The welding temperature field of T-joint was simulated by using ANSYS parametric design language (APDL), and infrared thermometers were used to measure the real-time temperature of the observation points during welding and cooling process. The simulation results match well with the measured results, which is indicated that the heat source model and the parameters used in this study is correct. The research results of this paper provide a basis and reference for further investigations and practical applications of numerical simulation for T-joints.
Heuristic for Three Machines Flow Shop Scheduling Problem to Minimize the Weighted Mean Flow Time
Authors: Camara Ibrahima , Zhou Hong
Published: July 2012

In practical situations, machines might not be available during certain time of period due to deterministic or stochastic causes in many production systems. And, processing times are always not exact as they have been predicted. In this paper, we attempted to study the three machines flow shop scheduling problem in which probabilities are associated with processing times of jobs involving transportation time, machine breakdown interval and weights of jobs. A simple heuristic approach is proposed to find optimal or near optimal sequence minimizing the weighted mean production flow time. A numerical example has been provided to illustrate and clarify the proposed algorithm.
The Use of Adaptive Algorithms on Smart Antenna Device
Authors: Chen Yuan Yuan , Liu Run Jie , Shen Jin Yuan , He Dan Dan
Published: July 2012

Adaptive beamforming is one of the core technology of the smart antenna system. Two different adaptive algorithms which adopt the minimum mean square algorithm (LMS) and recursive least squares algorithm (RLS) are employed to realize the beamforming in smart antenna system. The smart antenna system based on LMS and RLS is simulated and realized by the MATLAB software in which a uniform linear adaptive antenna array is used. The results show that the smart antenna systems based on RLS and LMS algorithms can significantly reduce the bit error rate especially with the low SNR.
A Combinatorial Classifier for Error-Data in Joining Processes with Diverse-Granular Computing
Authors: Chen Yi Lan , Wang Huan Bao
Published: July 2012

In this paper, we present a novel hybrid classification model with fuzzy clustering and design a newly combinatorial classifier for error-data in joining processes with diverse-granular computing, which is an ensemble of a naïve Bayes classifier with fuzzy c-means clustering. And we apply it to improve classification performance of traditional hard classifiers in more complex real-world situations. The fuzzy c-means clustering is applied to a fuzzy partition based on a given propositional function to augment the combinatorial classifier. This strategy would work better than a conventional hard classifier without fuzzy clustering. Proper scale granularity of objects contributes to higher classification performance of the combinatorial classifier. Our experimental results show the newly combinatorial classifier has improved the accuracy and stability of classification.
Data Integrity Check and Repair in Design and Manufacture of Distributed Storage Network
Authors: Liu Gang , Lou Yan Xiang , Liu Sheng Li
Published: July 2012

When clients store large files on a remote network of unreliable distributed servers, they want to verify that their files are properly stored in the servers without any modification. This can be achieved by the techniques of data integrity. In this paper, we consider how to implement data integrity check by a third party auditor (TPA) in a distributed storage network, with the help of BLS signature. We also consider how the distributed storage network restores data when some server fails or some server crushes down. We present a data integrity check and repair (DICR) scheme, which makes use of a random linear code for data restoration and BLS signature to implement data integrity check. Our scheme is robust in the way that the storage network can reconstruct the data when a limited number of servers fail. In the mean time, public auditing on the storage network liberates clients from computational overhead.
A Study on Material Functional Connectivity of the Human Brain via Granger Causality
Authors: Zhang Hong Yan , Qiua Zhi Jun , Tian Xin
Published: July 2012

16-channel EEG data during intermittent episodes of epilepsy is recoded and analyzed to find the lesions source for temporal lobe epilepsy by Granger causality. And the analysis of EEG with the lesions of temporal lobe epilepsy and non-lesions area of relationship between cause and effects is focused on, exploring temporal lobe epilepsy with lesions in other regions of the information transduction relationship for the clinical determination of temporal lobe epileptic focus to provide a theoretical the support. There are 8 cases patients which 6 cases patients of left-temporal lobe epilepsy and 2 cases patients of right-temporal lobe epilepsy in this work, Sampling frequency fs=200Hz，time t=20s (Sampling points N=4000). Granger causality is used to direction of the information transduction between each channel of the EEG signals. Autoregressive methods of EEG analysis for multi-channel data and determination of the coefficient of the matrix A, and proportion of operations on the matrix A is applied to get the result of matrix I which can reflect the causal relationship between each channel. The result shows that Granger causality can test the location of the lesions source and the areas that the information was reached. The results are consistent with the diagnosis of the EEG and CT. Granger causality not only can analyze the causal relationship of EEG, and it can calculate the multi-channel information transduction between the directions of EEG, which can provide support in the clinic for determine the source of seizure.
Preparation and Characterization of Low MWCO PES/SPSF Blend Ultrafiltration Membrane
Authors: Hou Qin , Ding Xiao Li , Zhang Yu Zhong , Lin Li Gang , Li Hong
Published: July 2012

The polyethersulfone/sulfonated polysolfone (PES/SPSF) blend ultrafiltration (UF) membranes with excellent performance were prepared by immersion phase inversion technique. The effects of degree of sulfonation (DS) of SPSF, PES/SPSF ratio, temperature of coagulation bath on the membrane porosity, pure water flux and rejection of PEG were investigated. The results show that the membrane performance with low molecular weight cut-off (MWCO) is excellent when the SPSF with 30% DS is added and the blending ratio of PES/SPSF is 4/1. The temperature of coagulation bath affects the structure of the membrane.
Study and Application on Cutting Technology of Underground Drifting Blasting
Authors: Zhang Xian Tang , Zou Peng , Zhou Hong Min , Wang Hong Li
Published: July 2012

Because of the weak borehole sealing and inadequate use of the initial free face, the higher investment and unsatisfactory blasting effect still exist in the mine tunnel excavation blasting. In order to improve the blasting effect of drifting, on the basis of a discussion on blasting mechanisms, the author take Xinhong Mine fine sandstone roadway for example, select reasonable blasting parameters and determine the proper cutting form. So that the efficiencies of blasting and excavation have been increased greatly, and good economic results has been achieved.
Detection of Weld Seam Position Based on Infrared Image during High Power Fiber Laser Welding
Authors: Chen Yu Quan , Gao Xiang Dong , Huang Jian Yuan , Wen Qian
Published: July 2012

Seam tracking is significant to obtain good welding quality. Aiming at establishing a model to detect and calculate the seam tracking offset during high-power fiber laser welding of Type 304 austenitic stainless steel plate butt joint welding, an infrared sensitive high-speed camera arranged off-axis orientation of laser beam was applied to capture the dynamic thermal images of molten pool. Through analyzing the infrared image, the actual position of the workpiece gap in the image was obtained. Least squares method was used to determine the precise position of the actual workpiece gap. A model that calculated the deviations between the workpiece gap and the laser beam was deduced. Also, the least squares method was used to fit the workpiece gap curve equation. The coordinate transformation technology was used and the welding seam equation was established. A linear model was obtained to detect the deviations between the workpiece gap and the welding seam. The welding experiments confirmed that the proposed welding seam equation was effective.
Research of Product Design Evaluation Based on Informational Engineering Models
Authors: Sun Qin Bao , Shang Kai , Lin Mei Yu
Published: July 2012

Decisive factors of the product design, such as shape, color, materials, structure, function, man-machine relationship, cannot be quantified, or they are "gray" in nature. This paper first applies the gray statistical methods to analyze the data of the indicators. Due to the difficulty in determining the index weight in the evaluation, we consolidated the indicators based on DEA Informational models, and concluded comprehensive results for various designs.
Property of LiMn0.5Ti0.75O3 Type Ion-Exchangers and Extraction for Lithium
Authors: Jiang Jin He
Published: July 2012

A spinel-type metal compound [LiMn0.5Ti0.75O3], was prepared by a solid state reaction crystallization method. The Li+ extraction/insertion with this material were investigated by X-ray and Kd measurement. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 4.2mmol/g for Li+.
Effects of Diameters on the Catalytic Activity of Spherical V-MCM-41 in the Selective Oxidation of Styrene
Authors: Chen Yu , Qin Hua , Shi Xiao Bo , Kong Yan
Published: July 2012

Spherical V-MCM-41s with different diameter are synthesized by direct hydrothermal method through the precise control over the molar ratio of NaOH/TEOS. Vanadium supported on spherical MCM-41s is also prepared by impregnation methods. They are used as heterogeneous catalysts for the oxidation of styrene with H2O2 as oxidant. The results suggest that all catalysts have high catalytic activity, which increases with their diameter decreasing.
Determination of the Curing Techniques of Octaepoxysilsesquioxane with a Diamine
Authors: Zhang Zeng Ping , Pei Jian Zhong , Fang Chang Qing , Chen Shuan Fa
Published: July 2012

Octaepoxysilsesquioxane (POSS-Ep), a kind of functional polyhedral oligomeric silsesquioxane (POSS) was cured with 4,4'-diaminodiphenylsulfone diamine (DDS) in this study. Possessing epoxy groups, it can be cured thermally with certain curing agents including amines. Differential scanning calorimetry (DSC) was used to determine the curing techniques of the POSS-Ep/DDS resin system in this study. The appropriate curing technique for this resin is set as: 130°C/2h+ 160°C/2h+200°C/2h.
Rapid Determination of Chemical Oxygen Demand in Sugar Refinery Wastewater by Short-Wave Near-Infrared Spectroscopy
Authors: Pan Tao , Chen Zeng Hai
Published: July 2012

Near-infrared (NIR) spectroscopy combined with partial least squares (PLS) regression and Savitzky-Golay (SG) smoothing was successfully applied for the rapid no-reagent determination of chemical oxygen demand (COD) in sugar refinery wastewater. Among 141 samples, 60 were randomly selected as the validation set. The remaining 81 samples were divided into the calibration set (50 samples) and the prediction set (31 samples) for a total of 20 times with certain similarities. The results showed that the short-wave NIR region (780 nm to 1100 nm) can be used as information waveband of COD in sugar refinery wastewater. The optimal SG smoothing parameters and PLS factors OD, DP, NSP, and F were 5, 5, 7, and 6, respectively. The modeling effects M-SEPAve, M-RP,Ave, M-SEPStd, and M-RP,Stdwere 24.3 mg/L, 0.971, 2.7 mg/L, and 0.007, respectively. The validation effects V-SEP and V-RP were 25.9 mg/L and 0.963, respectively. The results indicated that the method has good prediction effect and stability, and provided a reliable analysis model and valuable references for designing specialized instruments.
Preparation and Characterization of Aqueous Polyurethane Dispersions Derived from Anionic Polyester Diols
Authors: Chen Xiao Dong , Yi Yu Hua
Published: July 2012

Aqueous polyurethane (APU) dispersions with improved hydrophilicity were presented and characterized. In order to make APU products more competitive, anionic diols and dimethylopropanic acid (DMPA) were introduced into the macromoleculars of APU. The particle sizes of the APU dispersions have been reduced from 0.7~3μm to 0.05~0.6μm, and the storage stability has been prolonged from 6 months to 12 months. It is efficient to prepare the self-emulsifiable APU dispersions by applying anionic polyester diols and using triethanolamine (TEOA) as a neutralization agent.