bluuebunny/crossref_metadata_2025 huggingface dataset:
New Collaboration between Engineer and Product Feature Generation in Industrial PLM Systems
Authors: Horváth László , Rudas Imre J.
Published: March 2013

This paper introduces a new method for the communication between human and product model entity definition processes. As product definition is moving into modeling in industrial product lifecycle management (PLM) systems, and built-in knowledge and intelligent computing content of product models increase, development of product modeling faces new challenges. More often, knowledge content is not in accordance with authorized human intent and different intents of different authorized humans for the same task are not in harmony. At the same time, authorized human needs help to understand decisions of other humans at application and modification of existing entity definitions in product model. The authors of this paper found the answer for the above challenges in a new human-model generation communication which extends the conventional product feature definition to higher level definition of objectives and allows for harmonizing different human intents. This communication applies higher level connection of human and product object generation process by knowledge based contextual chain in which model entities are more appropriate for knowledge content based decisions as the currently applied knowledge ware features. The proposed communication is devoted as extension to currently applied one so that the new decision assistance can be integrated with the well proven feature driven current industrial modeling.
Structural Drag Reduction in Taylor-Couette Flow
Authors: Xue Ya Bo , Yao Zhen Qiang , Li Cang Xue
Published: March 2013

Energy consumption of fluid machinery, especially for canned motor pump that rotates in water, increases sharply as radius or speed increases. It not only leads to low efficiency of the pump, but also probably suppresses heat transfer between stator winding and water. According to researches on Taylor-Couette flow, dimensionless torque decreases obviously when both cylinders rotate in certain speed ratio. It inspires us to propose a structural design to realizing drag reduction in Taylor-Couette flow system, which has simple structure but huge potential.
Multiple Momentum Term BP Algorithm and its Application in Hot Rolling AGC System
Authors: Du Yi , Wang Yan
Published: March 2013

This paper introduces a BP algorithm which with the help of added multiple momentum terms can adjust network weight value online directly. This algorithm overcomes the classic BP network’s disadvantages, such as slow convergence rate and easily fall into local minimum, and apply the improved BP-PID algorithm to hot strip mill gauge control system. The simulation result proved that this algorithm has fast convergence rate and strong adaptive ability. So it is suitable for adjust PID parameters online.
Design of 3D Modeling for the New Wave Power Generation Device and Test
Authors: Wang Shi Ming , Wang Ya Nan , Liu Yin
Published: March 2013

Ocean wave energy is one kind of potential renewable energy that its energy density is far greater than solar energy or wind energy. This paper put forward a new method of using wave turbine to absorb wave energy, then output mechanical energy through mechanical drivers to generator, finally convert to electric energy by generator. Generally, structure design of the wave-wing is very important to the device. It is the important component of the device for absorbing wave energy. For this study, we design the 3D modeling of the new wave power device through SolidWorks software, and generate the wave turbine on proportion of 1:1. We have tested the wave turbine in the pool of the laboratory and obtain the torque and power under certain conditions.
The Rolling Bearing Fault Diagnosis Research Based on Improved Hilbert-Huang Transformation
Authors: Wan Zhou , Liao Xing Zhi , Xiong Xin , Han Jin Chuan
Published: March 2013

For empirical mode decomposition (EMD) of Hilbert-Huang transform (HHT) exists the problem of mode mixing. An analysis method based on ensemble empirical mode decomposition (EEMD) is proposed to apply to fault diagnosis of rolling bearing. This paper puts forward, after signal pretreatment, applying EEMD method to acquire the intrinsic mode function (IMF) of fault signal. Then according to correlation coefficient for IMFs and the signal before decomposing by EEMD method, some redundant low frequency IMFs produced in the process of decomposition can be eliminated, then the effective IMF components are selected to perform a local Hilbert marginal spectrum analysis, then fault characteristics are extracted. Through the vibration analysis of inner-race fault bearing it shows that this method can be effectively applied to extract fault characteristics of rolling bearing.
Biomimically Leg-Kinematics on Walking Robots
Authors: Wang Ching Kuo
Published: March 2013

This paper proposes a multi-link algorithm to analyze the walking stability of a self-fabricated, full-size, biomimic, android robot. The stepping trajectory is prescribed and navigated along a horizontal plane without slipping motions and variable center of gravity. However, it may encounter different circumstances for less number of LDOF. Traditionally, walking equilibrium can be assured based on the stabilizable conditions of the dynamic structure of 5-7 leg-degrees of freedom (LDOF). Various kinks of the walking structure are analyzed with the loading effects of the upper-body on the robot. The multi-link fuzzy-logic controller (MLFLC) is also proposed to stabilize the multi-LDOF walking system. Finally, Lyapunov stability can be successfully assured using the proposed controller under the assumption of the theory of the dynamic zero-moment points
Study on Fault-Tolerant Method of Mobile Robot Integrated Navigation
Authors: Zeng Jing , Guo Xiao Song , Zhang Guo Liang
Published: March 2013

As for the SLAM/DR/MEMS integrated navigation system of mobile robot constructed on the self-made SaecROB-H mobile robot, there exist mutant faults which are likely to occur, such as environment feature recognition error and data association error during mobile robot SLAM procedure, or dead reckoning failure caused by wheel slipping and so on. According to these mutant faults, mutant fault detecting and fault-tolerant filtering method was presented in this paper based on finite memory on-line prediction. At last, simulation was carried out and the results show that the method can improve the stability of mobile robot integrated navigation efficiently.
A Study of Robot Car Positioning System in Small Area Based on Optical Mouse Sensor
Authors: Su Tung Hsin , Chi Yao Ching
Published: March 2013

For robot car, positioning or finding coordinate of robot are important in robot competition. Because which position a robot locates will decide which way it will go or which operation it will perform. How to position accurately becomes a key technology for robot system. Most of the robot positioning systems in competition depends on some special assisted black lines or dots on the competition site. However, in order to enhance the robot design, cancel those assisted lines becomes a new trend. Without those assisted lines, we must develop a new positioning technology to face an environment without any assisted lines. In this paper, we use both Arduino microprocessor and optical mouse sensor to design an optical positioning system for robot. We install an optical mouse sensor in the bottom of robot. When the robot moves, the mouse sensor will return the raw data of movement vector. The middle device Arduino will analyze the movement vector base on previous coordinate and finds the new coordinate of robot. The robot is built by the Lego NXT system and is connected to the Arduino system by I2C interface. In robot, we can build a digitalized map of competition site in advanced. Then it can continuously read the new coordinate from Arduino while moving, and decide which way to go or perform some operation.
Target Searching of Mobile Robots Using Improved A* Searching Algorithm
Authors: Chang Chih Hung , Zou Jie Tong , Su Kuo Lan
Published: March 2013

The paper studies motion path planning problem using improved A* searching algorithm, and implements the movement scenario using mobile robot system. Solving the shortest path problem, Dijkstra algorithm can finds the shortest path to solve the path searching problem. The searching depth is not applicable in certain circumstances to be a disadvantage. The paper proposed improved A* searching algorithm using the intelligent node judgment method, it not only be able to retain the advantages of the traditional A* algorithm but also improve the shortcomings. It programs the on-time motion path in dynamic environment; it also programs the motion path more closed to the best path. Finally, the paper uses multiple strategies to improve the searching motion path to be the best motion path, and compares with the traditional A* algorithm to reduce the searching time.
The Design of Permanent Magnetic Adhesion System for Wall-Climbing Robot
Authors: Chen Yong , Wang Chang Ming
Published: March 2013

In order to satisfy the requirements on payload ability and maneuverability of the wall-climbing robot, a novel permanent magnetic adhesion system based on the linear Halbach array is designed. The permanent magnetic adhesion system and the wheel locomotion mechanism are employed in the robot system. By static and dynamic force analysis of the robot, design requirements about adhesion system are derived. The optimal dimensions of the mechanism are obtained using numerical modeling and parameter approximation method of first order partial derivative of dependent variables. Finally, the adhesion mechanism has been constructed and the maximum and minimum adhesion forces are measured and compared with numerical simulation and a good agreement is found.
The Best Path Planning of Home Care Robot by Building a Conceptual CBR Framework
Authors: Lu Wen Huan , Tao Wen Yuan , Wei Jian Guo
Published: March 2013

In this research, we present a Case-Based Reasoning framework for planning the best path of navigation robot. That is to adopt the combination of the Case-Based Reasoning method and ontology approach to disambiguate the cases in the context. The details of realizing the best path planning of robot by using this architecture was illustrated. Our approach for realizing case-based reasoning implies the representation of metadata characterizations of the features of cases and semantic formalization of these characterizations.
Application of Mobile Robot System for Cell Production
Authors: Matsuda Keishi , Ishihara Hidenori
Published: March 2013

In this paper, we have discussed on the performance of the knowledge sharing for the multiple robot system which is equipped with the advanced telecommunication devices. This has enabled the mobile robots to perform advanced communication. We propose the utilization of the knowledge sharing robot system at manufacturing scenes, and demonstrate the performance by a simplified simulation. Applying this knowledge sharing system, which helps to improve the balance of the line, the improvement of the productivity and quality was observed. Consequently, the cost reduction and improvement of the efficiency shall be expected by introducing more sophisticated algorithm of knowledge sharing and distribution.
Design and Fabrication of Micro-Coil Sensor Array by Using UV-LIGA Process
Authors: Xu Zhi Xiang , Jiang Feng Juan
Published: March 2013

A micro-coil array is designed and fabricated in this contribution by MEMS (Micro Electro Mechanical Systems) approach. The array’s width is from a dozen microns to several tens of microns. UV-LIGA process is used to fabricate the array by means of sputtering, lithography and electroforming. The sensor array is based on 300μm thick silicon wafer, and is composed of single excitation Cu coils, two serial detection coils. Detection coils are sized from 10μm×10μm, 20μm×15μm to 30μm×15μm respectively, with 10 turns. Successful fabrication of the micro-coil sensor demonstrates the feasibility of UV-LIGA process for miniaturization of micro-coils.
Wireless Power and Information Synchronous Transmission Technology Based on Magnetic Resonance
Authors: Li Wei Xin , Zhang He , Li Chang Sheng
Published: March 2013

In order to solve the problem that electromagnetic induction widely used now is just suited to short distance transmission, and study on the transmission characteristics of wireless power transmission system based on magnetic resonant coupling, a novel method that the two separate-coupling coils achieve wireless power and information synchronous transmission is proposed. The basic theory of wireless power transmission and information system is introduced. The condition that resonant frequency splitting phenomenon is produced of a contact-less power transmission system has been deduced, and it depend on the length of distance between the two coils. The principle prototype of transmission system is designed, and transmission characteristics of the system are analyzed by simulation and experiment. Based on circuit formulation, maximum efficiency is found to exist. The results show that the method of wireless power and information synchronous transmission system is in agreement with theoretical analysis.
Method of Data Transmission for Penetration Information Based on Flexible Connecting Cable
Authors: Li Shi Zhong , Zhang Ya , Zhang Xin Bin
Published: March 2013

Because of the abominable working environment caused by the strong defense capability of hard target, such as high speed, high overload, high pressure, high temperature, dust debris and so on, it is difficult to obtain reliably the testing data during penetration of ammunition. Aimed at this problem, a testing method is put forward, which can deliver penetrating data in real-time using a flexible connecting cable to ensure the smooth data transmission channel. And its key techniques, including unlatching and releasing technique, flexible connecting technique, data recording/transmitting technique, are analyzed. The study will provide a practical and effective testing means for experiments of the penetration ammunition.
A New Approach to Flat Form Error and Contact Error Analysis
Authors: Liu Qin , Wu Wei Ren , Zhang Zhi Jing , Jin Xin
Published: March 2013

A new model based on multi-scale asperities is established in order to accurately describe flat profile error. After measuring the surface, surface points are projected to each cross-section according to three-dimensional coordinates. Graham’s Scan algorithm is used to search border points of each data set. Then minimum circum-circle is calculated and optimized. Asperity’s radius of curvature and coordinates is calculated by relationship of circle radius and section’s interval. In the assembly process, it is primarily that the peaks on surface actually contact. The contact error plane equation is determined by three asperities which can stability support the other part, so three proper asperities should be searched out firstly. Finally, experimental results show that this model can be applied to calculated contact error.
Investigation on the Simulation of Nonlinear Switch Load in Three Phase Coordinate System
Authors: Huang Cong Wu , Chen Shao Chang
Published: March 2013

There are many nonlinear switch loads in a marine power system. In order to anlysize the influnce of nonlinear switch load on the operation parameters of a marine power system accurately , a simulation of a synchronous machine with the rectifier load in three phase coordinate systme is studied. The simulation results are completely consistent with the real physcial process, which proves the validity and accuracy of the simulation method.
A Robust P300-Speller Brain-Computer Interface Based on Kernel PCA
Authors: Liu Yi Hung , Weng Jui Tsung , Huang Han Pang , Teng Jyh Tong
Published: March 2013

P300 speller is a well-known brain-computer interface (BCI), which allows patients with severe motor disabilities to spell words through the recognition on patients’ brain activity measured by electroencephalography (EEG). The brain-activity recognition is essentially a task of detecting of P300 responses in EEG signals. Support vector machine (SVM) has been a widely-used P300 detector in existing works. However, SVM is computationally expensive, greatly reducing the usability of the speller BCI for practical use. To address this issue, we propose in this paper a novel P300 detector, which is based on the kernel principal component analysis (KPCA). The proposed detector has a lower computational complexity, and can measure the belongingness of an input EEG to P300 class by the construction of EEG in nonlinear eigenspaces. Results carried out on subjects show that the proposed method is able to significantly shorten offline training sessions of the speller BCI while achieving high online P300-detection accuracy.
Embedded Machine Vision System Design Based on Davinci DM355
Authors: Ma Hong Rui , Cai Jian Xian , Yu Rui Hong
Published: March 2013

Most existing machine vision processing system is 8-bit or 16-bit processor control system, complex algorithms and multi-tasking of the vision system have been severely constrained. DaVinci DM355 integrated ARM926 RISC processor core and specialized image processor is a programmable DMSoC development platform with digital multimedia codecs, high integration, low-power consumption. The machine vision system based on DaVinci DM355 development goal is to establish a low-power hardware development board based on the DaVinci DM355, transplant Linux operating system based on the hardware board and develop corresponding driver.This will provide the basis for the realization of complex algorithm and multitasking system for machine vision system.
System-Reliability Evaluation Based on Series Chain Model under Exponential Distribution
Authors: Gu Ruo Xing , Ma Xiao Bing , Zhao Yu
Published: March 2013

In the general reliability analysis of series systems, the components which compose the system are assumed independent of each other. However, for most mechanical series systems, dependent failure is their common feature. If neglecting dependent failures where CCF(Common Cause Failure) plays an important role, it will lead to considerable errors or even misleading conclusions. In this article, the concept of series chain model is put forward in consideration of the CCF. By using the load—strength interference model, the order statistic theory and the knowledge of statistical distribution, the author develops a specific method to evaluate the reliability of series systems under exponential distribution. In the last part, by using Monte Carlo simulation, a group of specific data are given to verify the series chain model and compare the two different series system model. The results show that the reliability calculation under the classic series model is relatively conservative, while the reliability calculation under the series chain model is convincing. And thus, the series chain model is more applicable in engineering.
Optimum Design of Rubber Isolator Based on Nonlinear Finite Element Method
Authors: Liu Wen Xi , Zhou Qi Dou
Published: March 2013

A rubber isolator which is used to connect two plates is designed. Based on the Mooney-Rivlin model, the static characteristics of the rubber are studied experimetally to obtain the model's parameters.According to operational requirements,the basic parameters and the basic dimensions are designed ,and then an optimization algorithm is adopted for the detailing of the rubber isolator, in which the dimensions of the isolator,the preload,the distance between the two plates and the maximum stress are considered as the design variables, and the stiffness is considered as the objective function.In the condition of satisfying the vibration-isolation effect, the numerical calculation is made by the nonlinear finite element method, and the rubber isolator is designed successfully.
The Dynamic Software Development Process for Industrial Manufacturing System
Authors: Jeong Hwa Young , Park Jong Hyuk , Choi Hae Gill
Published: March 2013

Industrial technology and its engineering depend on the integration of new technical trend, devices, its application and their business management processes. It also needs to consider the various situations in their working environment. Therefore, the system software engineer has to design the manufacturing system software considering accurate user need, system software requirement and matching their process to the machine in the design level when they make or develop the system software. In this paper, we discuss and make a process model for manufacturing system software. The software process model can be dynamical arrange their module when it needs re-arrange the sub module.
Fatigue Analysis for the Aircraft Landing Gear Connecting Parts
Authors: Li Ji Yan , Yang Zhi Bing
Published: March 2013

Landing gear is the critical component for aircrafts’ flight safety. According to the statistics, the accidents caused by the structure of landing gears and other structures relating to landing gears probably account for more than two thirds of the structural accidents. Fatigue failure is a key failure mode when the landing gears under the condition of alternating loads. Therefore it is very meaningful to develop the research on the fatigue life of the landing gears. The traditional fatigue analysis based on the test methods has many disadvantages, such as high cost and long test cycle. So a numerical simulation method was used to analyze the structural fatigue. Then the stress distribution and the fatigue life of the landing gear connecting parts under specific working conditions were studied. It turned out that the local fatigue performance of the component needed to be improved. The results have a certain value in engineering application and theoretical research, especially in improving the design level and working reliability of the aircraft landing gear.
Research on the Pressure-Measuring Uncertainty of Standard Internal Crusher Gauge
Authors: Zhao Chuan Rong , Kong De Ren , Wang Fang , Yang Li Xia , Li Li Ping
Published: March 2013

This article introduces the function, the method of selection and related criterion of standard internal crusher gauge, and systematically analyzes three factors that affect the measuring uncertainty of standard internal crusher gauge, including: inconsistency of pressure’s true value from pressure source, the uncertainty imported by standard copper-cylinder and the random fluctuations of the individual character of pressure measuring gauge. According to usage characteristics and selection methods of the standard internal crusher gauge, discusses computing methods of components of the measuring uncertainty and establishes evaluation model for measuring uncertainty of standard internal crusher gauge. The model can quantitatively calculate through experimental data of selection, which lay a theoretical foundation for the control of the pressure measuring uncertainty of standard internal crusher gauge.
Dynamics Analysis and Power Allocation Strategy Research for a New Hybrid Electric Urban Rail Vehicle
Authors: Chen Yan Qiu , Zhang Ji Ye , Chen Xiao Xi , Li Ming
Published: March 2013

In order to improve the efficiency and environment-friendliness of urban rail vehicles, a new hybrid electric locomotive is proposed. The general structure of the proposed hybrid electric locomotive is given and analyzed from a dynamics point of view. The calculation method of power output and its allocation strategy is discussed. A simulation is conducted in HELSP(Hybrid Electric Locomotive Simulation Platform) to verify the performance of the power allocation strategy. The result indicates that the function of allocating power can be properly realized, and the regeneration energy from frequent braking can be absorbed by the power storage of the vehicle.
Investigation of the Magnetic Signals for the Ferromagnetic Components after Tensile Fatigue under Weak Magnetic Excitation
Authors: Qiu Yong , Zhang Wei Min , Zeng Wei Qin , Qiu Zhong Chao
Published: March 2013

In order to investigate the magnetic signals on the surface of the ferromagnetic component, which have suffered the tensile fatigue under weak static magnetic excitation, an experiment is set up to operate the research. The 16MnR is adopted to make the specimen which will get the tensile fatigue, with a prefabricated small crack in the center position of it. The probe based on the GMR Array is engaged in the signal acquisition system. Magnetic signals at different tensile stage is obtained and mapped, as well as its gradient. Research between the characteristics of the signals and the specimen’s suspicious stress concentration or damaged area has been discussed to make a proper evaluation to the components.
The Over-Range Collocation Method for Nonlinear Analyses
Authors: Guo Yong Ming , Kamitani Shunpei
Published: March 2013

In this paper, a forging problem is analyzed by using the overrange collocation method (ORCM), which is a new meshless method. By introducing some collocation points, which are located out of domain of the analyzed body, unsatisfactory issue of the positivity conditions of boundary points in collocation methods can be avoided. Because the overrange points are used only in interpolating calculation, no overconstrain occurs in partial differential equations on the solved problems.
Rough Road Identification Method Based on Engine Speed Variation Rate
Authors: Lei Yu Long , Li Shun Bo , Liu Hong Bo
Published: March 2013

On rough road busy-shifting often occurs when shifting law is built based on traditional two parameters (i.e., velocity and throttle). In order to resolve this problem, this paper provides a method of recognizing rough road and modifying shift point. At first, a dynamic model was set up to demonstrate the possibility of identifying rough road by longitudinal acceleration. Furthermore, advantages of the engine speed variation rate were analyzed, so engine speed variation rate distinguishing the rough road was proved better. Then the analysis of time-domain and frequency-domain of the engine speed variation rate was carried out .On the basis of the result, the method of frequency domain based on the FFT and “Cross Meter Method” based on the times of the instantaneous values of engine speed variation rate greater than the threshold value was proposed. At last, the method of modifying shift strategy was proposed on the rough road. Through the road test, it was effective to prevent busy-shifting on rough road.
Analysis of Modal Properties of Spur Planetary Gears
Authors: Wang Jun Gang , Wang Yong , Huo Zhi Pu
Published: March 2013

A translational-rotational-coupling dynamic model has been built in the carrier-attached coordinate system.Differential equations of the system have been derived, and the natural frequencies and vibration modes of the planetary gear set have been obtained through solution of the associated eigenvalue problem. Based on the properties of the transmission system, the vibration modes of 2K-H spur planetary gear set can be classified into three categories, i.e., translational mode along radial direction, rotational mode, and planet mode.
Analysis of Bifurcations for a Functionally Graded Materials Plate
Authors: Yu Wei Qin
Published: March 2013

Using the analytical and numerical approaches, the nonlinear dynamic behaviors in the vicinity of a compound critical point are studied for a simply supported functionally graded materials (FGMs) rectangular plate. Normal form theory, bifurcation and stability theory are used to find closed form solutions for equilibria and periodic motions. Stability conditions of these solutions are obtained explicitly and critical boundaries are also derived. Finally, numerical results are presented to confirm the analytical predictions
The Study on the Removal of Ammonia Nitrogen in Wastewater by Thin Film Coating Photo-Catalytic Oxidation Process
Authors: Joo Hyun Jong , Choi Jung Soo , Kwon Dong Wook , Hong Sung Chang
Published: March 2013

A new process for advanced wastewater treatment process has been devised with auxiliary treatment unit employing the ammonia oxidizing photo-catalytic thin film. In winter time, due to low water temperature, conventional nitrogen removal treatment experiences almost no nitrification by nitrifying bacteria. To solve the problem and to meet the governmental effluent guideline the treated water has been recycled through the auxiliary unit in which the auxiliary system was applied with the thin film coating photo-catalyst. This study also identifies the characteristics of the thin film coating-photo-catalyst through XRD, SEM and analyzes the ammonia nitrogen removal efficiency by using the thin film coating photo-catalyst in the reactor which resembles a sewage treatment process. The evaluation of the entire process of biological treatment in accord with the application of thin film coating photo-catalyst was performed through computer simulation. A relevant computer model for mass balance was made and utilized to select proper optimal operating condition such as recycle ratio. Result shows the proposed new process has potential applicability to renovate existing treatment plants.
A Comparative Study on Electrochemical Behavior of (La,Sr)FeO3 and (La,Sr)FeO3-(La,Sr)MnO3 Anodes for Solid Oxide Electrolysis Cells
Authors: Wang Jing , Zhang Yong , Guo Wen Li , Liang Tong Xiang , Deng Chang Sheng , Xu Jing Ming
Published: March 2013

La0.8Sr0.2FeO3 electrodes modified with nanoparticles of La0.8Sr0.2MnO3 (LSF/LSM) were prepared by infiltration method. LSM solution had good wettability on LSF surfaces and good electrochemical compatibility with LSF. The impedance of half-cells incorporating the electrodes was also examined. The deconvolution of the impedance spectrum indicated that the peak positions are changed after the LSF infiltration. The LSF/LSM electrode exhibited smaller polarization resistance than pure LSF electrode. Finally, a transform from asymmetry to symmetry appeared in the polarization curves of LSF/LSM electrode with the increase of temperature.
Nitric Acid Activated Carbon Aerogels for Supercapacitors
Authors: Li Ya Jie , Ni Xing Yuan , Shen Jun , Liu Dong , Liu Nian Ping
Published: March 2013

The electrochemical performances of resorcinol–formaldehyde-based carbon aerogels can be significantly enhanced by nitric acid activation.FT-IR spectra and SEM images reveal the constitution and morphology of samples .The electrochemical performances of materials were tested by cyclic voltammetry,galvanostatic charge/discharge test ,electrochemical impedance spectroscopy and cyclic test. The results show that activation does not influence the molecular structure of carbon aerogels,which maintains their nano-porous structure. Activation increases the specific capacitance by 50% and improves the conductivity of carbon aerogels,resulting in fenfect cycling stability. So nitric acid activated carbon aerogels is an ideal electrode material for supercapacitors.
Research on the Elastic Property of Three New Superhard Materials
Authors: Li Feng , Hui Qun , Ao Jing , Wang Jin , Li Chun Mei , Chen Zhi Qian
Published: March 2013

In this thesis, elastic properties of three BCN superhard materials with different structures are computed by using CASTEP software developed according to the first principles which are based on density functional theory (DFT) and plane wave method. CA-PZ of local density approximation (LDA) and PBE of generalized gradient approximation (GGA) are adopted to describe the exchange-correlation effect between electrons. The results are compared with other findings and c-BN data. Through analysis, it is found that the spatial anisotropy do exist in the Young's modulus of single crystals all three BCN compounds.
High Flux Nanofiltration Membranes Prepared by Dynamic Self-Assembly of PSS-co-MA and PAH for CuCl2 Removal
Authors: Deng Hui Yu , Chen Qing Chun , Le Zhang Gao , Zhu Bao Ku , Xu You Yi
Published: March 2013

A series of nanofiltration membranes with high flux at low operating pressure were prepared by dynamic self-assembly of poly (styrenesulfonic acid sodium salt) (PSS), poly (4-styrenesulfonic acid-co-maleic acid) sodium salt (PSS-co-MA) and poly (allylamine hydrochloride) (PAH) on the modified polyacrylonitrile (PAN) membrane. Fourier transform infrared spectroscopy (FTIR-ATR) testified that the polyelectrolyte could successfully deposit on the surface of the modified polyacrylonitrile ultrafiltration membrane. The effects of substrates, assemble bilayer number and the capping PAH solution concentration, operating pressure and CuCl2 concentration on CuCl2 removal were investigated. The [PAH/PSS] 1 PAH/PSS-co-MA/PAHc NF membrane composed of only 2.5 bi-layers displayed 88.9% CuCl2 rejection and the permeate flux was 25.1 L/ m2.h when the operating pressure was 0.2 MPa. The CuCl2 rejection was still above 86.3% when the operation pressure increased to 0.8 MPa, meanwhile, the permeate flux increased greatly to 85.8 L/ m2.h.
Graphene Oxide Oxidized by NaClO as a Highly Effective Adsorbent for Fast Removal of Dye Rhodamine B
Authors: Chen Jun Yong , Liu Yan , Gou Jia Jia , Hao Yong Mei
Published: March 2013

The present paper reports a high effective adsorbent graphene oxide (GO) oxidized by NaClO. Its ability to separate cationic dye rhodamine (RhB) from aqueous solution was investigated. The adsorption of RhB onto GO can reach adsorption equilibrium within a short time, and the adsorbent exhibits excellent removal efficiency, which suggests its potential application value in removing dye from waste water.
A New Model of Predicting the Hydrogen Element in Coal-Fired
Authors: Wen Xiao Qiang , Xu Zhi Ming
Published: March 2013

A new model was built to predict hydrogen element in coal-fired based on partial least squares regression algorithm, in which there were 4 input vectors, which were the moisture, ash content, volatile matter and low calorific value, and one output vectors, which was the hydrogen element. By comparison of the predicted and experimental results of test samples, the maximal relative error of the model was less than 10.0%, so, the partial least-squares regression algorithm model is reasonable and feasible. It provides an effective method for the operation personnel to anticipate the hydrogen element under conditions of known coal industrial analysis component.
Fabrication of TiO2 Nanotube Arrays in Ethylene Glycol Electrolyte by the Electrochemical Anodization Method
Authors: Liu Rui , Qiang Liang Sheng , Yang Wein Duo , Liu Hsin Yi
Published: March 2013

Highly-ordered TiO2 nanotube arrays were successfully fabricated by electrochemical anodization of titanium. The morphology of TiO2 nanotube arrays, the length and pore size were represented by field emission scanning electron microscopy (FE-SEM). The parameters of various anodization including F- concentration, reaction temperature and anodization voltage were investigated in detail. The results show that as-prepared TiO2 nanotube arrays possess good uniformity and well-aligned morphology in mixture of ethylene glycol and 0.3 wt% NH4F electrolyte at 40 V for 25 °C. The growth rates of TiO2 nanotube arrays can show activation energy.
Hydrogen Permeation Behavior through HSLA Steels and its Implications on Hydrogen Embrittlement Susceptibility
Authors: Zhang Ti Ming , Zhao Wei Min , Guo Wang , Yong Wang
Published: March 2013

In order to investigate the susceptibility of HSLA steels to hydrogen embrittlement (HE) when cathodic protection system was applied, a new electrochemical hydrogen permeation test method was performed to measure the hydrogen permeation current behavior through X65 steel and X80 steel in artificial seawater with different polarized potentials. Besides, slow strain rate test (SSRT) was introduced to study the effect of penetrated hydrogen atoms on the HE susceptibility of the steels. Results showed that with the decrease of the polarized potential, the sub-surface hydrogen concentration in the steels became higher and higher, and the corresponding HE susceptibility increased as well. What’s more, the X80 steel was more vulnerable to HE, and that owns to the minor grain size and M-A microstructure, which may trap more hydrogen atoms, and thus led to the HE susceptibility difference between the two steels. All these findings would be used as guidance when cathodic protection were carried out for offshore HSLA steel structures.
Study of a Wave Absorber in Various Distance Placed in a Sinusoidal Propagate Wave
Authors: Yuan Zhen Zhong , Chauhan Bhupendra Singh , Lim Hee Chang
Published: March 2013

Since there has been a rapid progress to understand the dynamics of an offshore floating body under an ocean environment, we undertake to generate the ocean waves in a lab-scale wind-wave flume. The study is aiming to observe and optimize the similar ocean environmental condition as input wave and to reduce the wall reflective wave. Several absorption methods are suggested to optimize the propagate wave by measuring the maximum and minimum of the standing wave envelope. There has been no optimized absorption method, as they highly depend on the wave period and the wave length. One of the methods - two fixed wave gauges measuring two wave heights and one wave phase - is applied in this study. In the present paper various approaches were used to analyze the results using the flume, by position of probes, with absorber and without absorber, different position, condition and angle of the wave absorber, This paper also focuses on the analysis of fundamental equations which describe the separating method of the incident and reflective wave, and finally we confirm that the wave absorber is highly efficient considering all the permutation and combination.From the study it is clear that there is a change in the wave amplitude at the receiving end then the generated end; wave absorber is a strong source to control the energy of the coming wave. With the changing the period of the wave, the reflectance is increasing when the period becomes larger.
Static Aeroelasticity Analysis of High Aspect Ratio Wing and the Jig-Shape Design Based on Multi-Block Structural Grid
Authors: Liu Yan , Bai Jun Qiang , Hua Jun
Published: March 2013

The influence of structural elastic deformation on the aerodynamic characterisitcs of large transport aircraft has been researched. A method of static aeroelasticity based on multi-block structural grid of high aspect ratio wing has been established, and then a design method of jig-shape is developed. The technology of RBF interpolation is used to exchange the data of CFD/CSD. Based on RBF&Delaunay technology, a mesh motion method is developed to make the design process less time-consuming, which can be applied to large deformation of multi-block structural grid. The static aeroelastic deformation of a wing-body of large transport aircraft is analyzed. Then the wing-body's jig-shape is designed. Compared the aerodynamic characteristics between design cruise shape and target cruise shape, it shows that the aerodynamic characteristics of design cruise shape is almost equal to target cruise shape and the design process of jig-shape is feasible.
Fluid to Fluid Modeling for Post Dry Out Using Dimensional Analysis and Energy Scaling
Authors: Nemitallah Medhat , El-Nakla Meamer
Published: March 2013

In this work, both dimensional analyses using Buckingham Pi-theorem and scaling of the energy equation have been applied successfully in fluid to fluid modeling for post dry out to model the Freon (R-134a) data available in the literature and convert it to water equivalent data. Also the results are compared with the available data in the literature for water. Experimental data sets in two fluids are assumed to be equivalent if the values of the dimensionless groups are equal for both fluids. Both methods are used and the results are compared with the experimental data at different operating conditions. The Katto and the Ahmad modeling dimensionless parameters coming from the analysis using Pi-theorem predicted successfully the equivalent data of water at moderate mass fluxes. However, at too high or low mass fluxes, this method deviated from the experimental data. However, the fluid to fluid modeling using the scaling of energy equation is applicable at any operating conditions and the results are too close to the experimental data.
Residual Strength of the CFRP- Strengthening Small Concrete Columns in Fire Situation
Authors: de Oliveira Clayton Reis , Lopes Moreno Armando
Published: March 2013

This paper presents the experimental results of a study carried out to investigate the performance of small scale concrete columns retrofitted with unidirectional carbon fiber-reinforced polymer (CFRP) in fire situation. This study aims at the effectiveness of CFRP through the contrast test. In order to observe the residual compressive strength, the specimen was heated to a target temperature and mechanically tested under axial compression. Other similar heated specimen was cooled down to the room temperature and mechanically tested too. This procedure was repeated by temperatures of 200oC, 300oC, 350oC, 400oC, 450oC, 500oC, 600oC, 700oC, 800oC and 1050oC. The heating inside the furnace was controlled in such a way that the average temperature in the furnace followed the standard time-temperature curve, ISO 834 [1]. The experimental results comproved that, due to low temperature resistance, the CFRP systems are not capable of safely and adequately enduring fire for any substantial period of time. This study evaluated a supplementary residual compressive strength of CFRP systems after cooling down to the room temperature. Finally, this study should benefit CFRP-fire research efforts by providing a similitude relationship for the testing of full-scale and small-scale specimens.
Mechanical Structural Optimization and Research for an Intelligent Vehicle Model
Authors: Leng Chong Jie , Xiang Hui Yu , Zhou Xiao Zhuang , Huang Jia Jun
Published: March 2013

This paper utilized an intelligent vehicle model for the “Freescale” Cup National College Students' Intelligent Vehicle competition as the main study object. Under the prerequisite of adopting the same control procedures and algorithms, the mechanical structures and its parameters of the model vehicle which influence the running performance, such as front wheel alignment, steering mechanism and rear wheel deceleration mechanism are optimally designed and adjusted .It has been proved that the scheme induced the model vehicle driving fast and stable on the path-complex track and thus to achieve reasonable effects.
The Effect of Radiation on Oxy-Fuel Combustion Characteristics in Microchannels
Authors: Ben-Mansour Rached , Habib Mohamed A. , Ahmed Pervez
Published: March 2013

The importance of thermal radiation in heat transfer mechanism in many micro combustion systems has been well identified in the past few years. There is currently lack of quantitative understanding on the radiation heat transfer in relatively small scale laminar diffusion flames in microchannels. In the present study a two dimensional model is considered to investigate the effects of radiation on oxy-fuel combustion characteristics in microchannels. The discrete-ordinates radiation model is used for the study. It is observed that excluding radiation model results in the over-prediction of combustion temperatures in the micro-reactor. It has also been observed that the overall reaction rate and its peak value increase when accounting for radiative heat transfer, despite the decrease in temperature caused by radiation. Therefore, it is important to incorporate a radiation heat transfer model in combustion micro-systems in order to predict their characteristics accurately.
The Finite Element Analysis of Temperature Cracking Propagation Process of Pouring Mass Concrete
Authors: Li Yan , Dong Wen Yang , Wang Bo
Published: March 2013

Mass concrete temperature cracking is an important problem of concrete foundation safety in civil engineering projects, which exists from construction process of concrete foundation to operation period. This paper introduces the simulation method of mass concrete temperature cracking propagation process by Finite Element Method(FEM). With the concrete heat conduction problem, an example to study concrete surface cracks of the whole process of pouring concrete caused by temperature changes and discussed how concrete cracking process brought from temperature decrease is simulated by FEM. The results show that the finite element method can effectively simulate the development of concrete block cracks under temperature stress. The calculation result accord the cracks distribution law of mass concrete blocks in the uniform temperature drop and the basis of strong constraints.
An Advanced Technology for Enhancement of Transmission Loadability Using FACTS Devices
Authors: Huang Chao Ming , Huang Yann Chang , Huang Kun Yuan
Published: March 2013

This paper proposes an advanced technology to enhance the transfer capability of transmission system using flexible AC transmission system (FACTS). FACTS consists of thyristor-controlled series capacitor (TCSC), thyristor-controlled phase shifting transformer (TCPST), thyristor-controlled voltage regulator (TCVR) and static var compensator (SVC). The location of FACTS and their associated values dominate the transfer capability of transmission system. To determine the optimal solution of FACTS, this paper presents an enhanced differential evolution (EDE) approach to deal with this type of optimization problem. In comparison with basic DE, EDE uses a variable scaling mutation to adaptively adjust the mutation operation and enhance the global search capability of basic DE. The proposed method is verified on an IEEE 30-bus 41-transmission line system. To verify the performance of the proposed method, the basic DE and particle swarm optimization (PSO) methods are also implemented using the same database. The results show that the proposed approach provides better transmission loadability with less execution time than the existing methods.
Handling Dynamic Concerns of Designing a Platform for Mechatronic Software Systems
Authors: Țundrea Emanuel , Steinke Gerhard
Published: March 2013

One of the challenges today is to build software frameworks for the embedded software in mechatronic systems. This paper presents the SmartModels approach which facilitates the design of a framework to create and generate easy development of software product lines solutions. One of its main strength lies in the ease with which a designer can handle the dynamic aspects of a model by dealing with variability and flexibility of user requirements. We illustrate our approach by modeling the embedded software requirements for developing anti-lock braking systems (ABS).
Development of the Environment-Friendly Wild Jujube Date Pit Taking Machine
Authors: Shan Quan , Chen Yan
Published: March 2013

Now the wild jujube processing conduce to pollution, but the demands for wild jujube kernel is growing wider. So, the urgent need to solve environmental problems in the wild jujube production. In this paper, the environment-friendly wild jujube date produced machine has been developed. This machine is designed broken with broken devices and separation devices. The role of broken device is smashed the wild jujube pericarp and flesh. The role of separation devices is separated the wild jujube flesh and date pit, the flesh and date pit can drop from different export. The experiment proved that the machine can effectively reduce water consumption and the volume of sewage to achieve the purpose of environment protection.