bluuebunny/crossref_metadata_2025 huggingface dataset:
Adaptive Software based on Correct-by-Construction Metamodels
Authors: Barbier Franck , Castéran Pierre , Cariou Eric , le Goaer Olivier
Published: June 2013

Despite significant research efforts in the last decade, UML has not reached the status of being a high-confidence modeling language. This is due to unsound foundations that result from the insufficiently formal structuring of metamodels that define the MOF/UML Infrastructure. Nowadays, UML-related metamodels are implemented in computing environments (e.g., EMF) to play the role of metadata when one seeks adaptation at runtime. To properly instrument metamodel-based adaptation, this chapter re-formalizes the core of the MOF/UML Infrastructure along with giving formal proofs that avoid ambiguities, contradictions, or redundancies. A (meta-)class creation mechanism (either by instantiation or inheritance) is based on inductive types taken from the constructive logic. Inherent proofs based on the Coq automated prover are also provided. This chapter’s contribution is aligned with a previously established metamodeling framework named “Matters of (meta-)modeling.”
Evaluation of the Load Carrying Capacity of Short RC Columns Strengthened with a Novel Cementitious Material by Using FEA
Authors: Toma Ionut Ovidiu , Covatariu Daniel , Lungu Irina , Budescu Mihai
Published: June 2013

Numerical simulations based on the Finite Element Method (FEM) have become an important tool in studying various phenomena of interest to both researchers and practitioners alike. The recent advances in computational power coupled with accurate mathematical models have made FEM an indispensable tool for investigating complex loading states and material behavior that are frequently met in civil engineering. Strengthening of existing RC columns is becoming a pressing issue in the field of civil engineering due to the necessity of meeting new safety requirements for the buildings located in active seismic areas. Jacketing is a widely used method for strengthening of reinforced concrete columns showing good results in terms of increased strength and stiffness but with the addition of some unwanted effects amongst which the added dead weight is of primary importance in case of an earthquake. The paper presents the results obtained by means of Finite Element Analysis (FEA) on the load carrying capacity of short RC columns strengthened with a novel Cementitious material that may be the solution to lighter structures and lower added costs compared to other existing methods.
Fatigue Behaviour of Stainless Steel Used for Turbine Runners
Authors: Negru Radu , Marsavina Liviu , Muntean Sebastian , Pasca Niculai
Published: June 2013

The key ingredient for any turbine runners design procedure and failure analysis is the material and its mechanical and fatigue properties. Starting from this observation, a series of static and dynamic tests were performed on the T10CuNiCr180 stainless steel after more than three decades of service. The fatigue tests were carried out under constant amplitude at a stress ratio of 0.1 and a frequency of 20 Hz. In the high cycle fatigue range, the S-N median curve was plotted and the fatigue limit for 3106cycles to failure was determined at 93.35 [MPa] expressed in stress amplitude. The casting and welding defects that were observed on fracture surfaces explained this lower fatigue limit. The fatigue crack growth tests were performed on compact tension specimens and a three-parameter model was used to plot the crack length versus number of cycles curves. In addition, the material constants from Paris law were determined. Finally, the experimental results are compared against published data for another stainless steel.
Study Regarding the Transmissibility Vibrations about Hand-Arm System, Using Vibration Attenuation
Authors: Cristea Felicia Aurora
Published: June 2013

The aim of the paper is to present a way to reduce mechanical vibrations that are transmitted to the operators arm at workplace. This can be done using an innovative device, a damper mounted parallel to the forearm, between the wrist and the elbow. The innovative idea of this paper is the creation (design and realization of the practice) of a vibration attenuator device, which will be mounted along of the forearm; this could minimize the transmitted vibration, by the hand up the arm.The simulation demonstrated that there is a way to reduce the mechanical vibrations for the hand-arm system model chosen. This could lead to the reduction of occupational illnesses that are frequently found in workplaces like this. The conclusions of the experiment performed validated the theoretical results generated by the simulation and have shown that, by using an attenuator device mounted parallel to the forearm (between the wrist and the elbow), we can reduce vibrations along the arm to the shoulder by 50%.
Three Dimensional Path Planning of Autonomous Underwater Vehicles
Authors: Peng Yan , Wu Wei Qing , Liu Mei , Xie Shao Rong , Luo Jun
Published: June 2013

The path planning relates to the safe movement and navigation of the Autonomous Underwater Vehicles (AUV). This paper discusses the way of real-time path planning for autonomous underwater vehicle based on tracking control lyapunov function. The simulation conducted on H300 illustrates the effectiveness of proposed method.
An Efficient Algorithm for Collision Detection on Five-Axis Machining
Authors: Lin R.S. , Chang R.G. , Yan J.L. , Chiu H.S.
Published: June 2013

Five-axis machining has been widely used in industry recently; however, it has potential axial table colliding problems. The objective for this paper is proposing an efficient algorithm for five-axis machining collision detections. This research uses a systematic approach for collision detection. The methodologies include the kinematics analyses for five-axis motions, separating axis method for collision detection, and computer simulation for verification. The machine structure is modeled as STL format in CAD software. The input to the detection system is the g-code part program, which describes the tool motions to produce the part surface. This research produced a simulation program by VB programming software and demonstrated a five-axis machining example with collision detection. The system simulates the five-axis CNC motion for tool trajectory and detects for any collisions according to the input g-codes. The result shows that our method improves 4.5 time of computational efficiency, comparing to the conventional detection method.
About SOA and its Realization Technology Discussion
Authors: Mao Li Na , Tang Yan Lin , Lu Liu , Zhang Tian Bou
Published: June 2013

In this paper, the service oriented architecture (SOA) and its realization technology to do some discussion. This is a Web service is known as the next generation of new software technology framework.
A New Hybrid Particle Swarm Optimization for Solving the Knapsack Problem
Authors: Wang Hong
Published: June 2013

A Knapsack Problem is a typical NP complete problem. For solving Knapsack problem, A new improved Particle Swarm Optimization algorithm was proposed in this paper, the new algorithm combine Dantzigs theory of Knapsack Problem and crossover and mutation operation of Genetic Algorithm. According their fitness values, individuals are improved firstly by crossover, Daviss sequence crossover method and reverse mutation method are used respectively in the course of crossover and mutation. Numerical examples illustrate the validity and efficiency of the new hybrid Particle Swarm Optimization.
Application Research of Two-Tuple Linguistic Theory in Warship Battle Damage Assessment
Authors: Jun Gong , Lu Yao , Bai Lin Jie
Published: June 2013

With respect to the problems of losing dates and information distorting, which may cause false decision in battle damage assessment, a warship optimized model was put forth on the basis of two-tuple linguistic theory and triangular fuzzy number. In the end, a reasonable conclusion is used for battle decision and repair according to simulating.
Assessment of Polycyclic Aromatic Hydrocarbons Contaminations in Sediments of Love River Mouth, Taiwan
Authors: Dong Cheng Di , Chen Chih Feng , Chang Yi Kuo , Chen Chiu Wen
Published: June 2013

The surface samples were collected from the Love River mouth, Taiwan and analyzed for polycyclic aromatic hydrocarbons (PAHs). Total PAHs concentrations varied from 785 to 1,893 ng/g dw. The spatial distribution of PAHs reveals that the PAHs concentration is relatively high in the river mouth region, and gradually diminishes toward the harbor region. Diagnostic ratios showed that the possible source of PAHs in the Love River mouth could be petroleum combustion. The toxic equivalent concentrations (TEQcarc) of PAHs varied from 117 to 272 ng TEQ/g dw. Higher total TEQcarc values were found in the river mouth region. As compared with the US Sediment Quality Guidelines (SQGs), the observed levels of PAHs at Love River mouth were lower than the effects range low (ERL), and would probably not exert adverse biological effects.
New Rotor with Variable Clearance in the Short Fiber Rubber Composite Mixing
Authors: Liu Cai Jun , Wang Chuan Sheng
Published: June 2013

The mixing mechanism of short fiber/rubber composite was analyzed. The clearance between the rotor edge peak and mixing chamber influenced mixing, dispersion and length of the short fibers in compound. The new rotor was designed with variable clearance. The large clearance gap improve the mixing, and the small clearance gap helped to improve the dispersion of short fiber. The mixing quality and performance of short fiber/rubber composite were improved by using the new rotor, and the production efficiency increased.
Resistance Analysis of RC Frame Corner Joint Subjected to Progressive Collapse
Authors: Zhang Peng , Yang Zhi Yong , Zhou Huan Ting , Hu Jun
Published: June 2013

The corner joints of the fringe frame are the most vulnerable components among RC frame structural joints when subjected to progressive collapse, but very few research focused on its performance against progressive collapse. In this research, nonlinear static analysis method was used to analyze the vertical resistance of corner joint against progressive collapse by finite element software ANSYS. The influence of structural design parameters were also studied through comparative analysis. The result shows the joint ultimate vertical resistance is mainly influenced by the moment carrying capacity of the beam ends and column ends. Consequently, this research could offer reference for structural design against progressive collapse.
The Improved K-Means Cluster Analysis on Diagnosis Data Fusion of the Aero-Engine
Authors: Liu Xiao Bo , Deng Bei Bei , Shen Liang Ni
Published: June 2013

Aiming at the problem about initial clustering center was randomly assigned in K-means clustering algorithm, the improved K-means clustering algorithm based on hierarchical clustering algorithm and K-means clustering algorithm was proposed in this paper. In the improved algorithm, first of all K was calculated by hierarchical clustering. When K was determined, K-means clustering was implemented. The results of the aero-engine vibration data clustering shown that not only the k value was to quickly and accurately determined, but also the number of clusters can be reduced and higher computing efficiency can be attained by the improved K-means clustering algorithm.
Simulation Model and Experimental Verification of Electro-Hydraulic Servo Valve
Authors: Ruan Xiao Fang
Published: June 2013

Structure and working principle of the two-stage moving coil electro-hydraulic servo valve has been analyzed. Through Laplace transformation to get the transfer function by the dynamic equations of the moving coil force motor, the displacement and current double closed loop control to simulate the force output characteristics, ignoring the electromagnet and valve clearance of hysteresis effect, the simulation model was established based on AMESim. The main simulation parameters was determined by the means of measuring and calculating, the control parameters of the pilot spool and the main spool were optimized based on the step response. Inputting the same multiple superimposed sine excitation signal to the physical prototype and simulation models, comparing the simulation and experimental results in the time domain and frequency domain, the correctness of simulation model was proved.
Key Technologies of Telepresence in Time-Delayed Teleoperation System: Review and Analysis
Authors: Chen Jian Hua , Mu Xi Hui , Du Feng Po , Guo Hao Liang
Published: June 2013

This paper reviews some key technologies and progress in the field of telepresence of teleoperation, meaning human sense and control of remote telerobot. Telepresence is the symbol of teleoperation, phenomenon of which enables the human to feel present at a remote location however a time-delay exits always in the teleoperation system. There are three means to conquer the effect: bilateral control method, virtual model based control and virtual reality technology. By optimizing control strategy user will get a perfect force or visual telepresence. Finally, opinions are given as to the further development of the field.
Nonlinear Revision of the Linear Model for Stockbridge Vibration Damper and Experiment Validation
Authors: Luo Xiao Yu , Zhang Yi Sheng , Zheng Yong Ping
Published: June 2013

Stockbridge vibration damper is widely used in overhead transmission lines to alleviate the wind-induced aeoline vibration. In the past few decades, linear analytic model had been developed to interpret characteristics of the vibration damper. However, nonlinear vibration characteristics of the damper have rarely been studied theoretically. In this paper, experiment was set up to reveal the nonlinearity during the vibration of the Stockbridge vibration damper. Then the linear model was revised by considering the supporting part of the strand steel cable as elastic foundation. This makes the length of the cable a variable depending on the deflection of the cable, which is affected by the vibration velocity. Results obtained from the nonlinear revised model compare better with experiment than those from linear model.
Study on Friction Chatter Mechanism of Power Ultrasonic Vibration Honing Based on Stribeck Effect
Authors: Wang J.Q. , Zhu X.J. , Cheng Q.
Published: June 2013

Chatter easily occurs in machining, which is influenced by many factors. The power ultrasonic vibration honing equipment is taken as the research object, the dynamic friction, is studied and the dynamics model is established based on the Stribeck model and the phase trajectories and time responses are analyzed by piece-wise linear method in this paper. The results show that the system is stable and convergence rate is affected by the equivalent elastic coefficient k, the damping coefficient c and c1, the positive pressure value of N if the honing speedor. The system is critical stable and the values of k,c,Nsatisfy if or. So it should be considered that appropriately reduce the values of k, c, N when the system is designed.
Dynamic Performance Analysis on Helical Milling Spindle Unit
Authors: Wang Hai Yan , Qin Xu Da
Published: June 2013

Helical milling is a new holes processing technology, in which the special tool moves to the work piece with a helical path. Helical milling spindle unit is designed based on the helical milling machining principle. The dynamic performance of the unit has much effect on the workpiece surface quality. According to the whole transfer matrix method, the first four order critical speeds are obtained, and the effect of bearing span and stiffness on the critical speed is systematically studied. The result shows that the first order critical speed increases with the increase of bearing span and bearing stiffness.
The Model Construction and Structures of the Dendronized SWCNTs Collaborative Nano-Materials
Authors: Liu Yan Zhi , Liu Yan , Tang Huian
Published: June 2013

The dendronized SWCNTs collaborative nanomaterials were designed by grafting the dendrimers to the surfaces of the SWCNTs (11, 5) based on the interface characteristics of the dendrimer. The results based on molecular dynamics studies shown that the dendrimer modifications formed spiral parallel coated structures after grafting, which probably amplified the chirality of the SWCNTs (11, 5) and used in chirality recognition. 0G dendrimer modification makes the surface of the SWNCTs produce more point outshoots, and the modification is with a better parallel position to the carbon nanotube. These point outshoots increased the active points on the surfaces of the SWCNTs, which maybe lead to high field emission performance.
Glucose Biosensor Based on Pt Nanoparticles/Graphene Chitosan Bionanocomposites
Authors: Liu Hui Ping , Zhan Gong Yong , Dong Qi Zhi , Lv Yan An , Wang Jian Fang , Tao Cheng An , Hu Zhi Hong
Published: June 2013

In this paper, we fabricated a bionanocomposite film of glucose oxidase/Pt nanoparticles/graphene-chitosan (GOD/PtNPs/GR-Chit) for glucose sensing. The hybrid bionanocomposites modified GCE were characterized by scanning electron microscopy (SEM), cyclic voltammetry, and amperometric i-t curve. It was found that the PtNPs were uniformly deposited on the surface of GR-Chit hybrid film. The resultant PtNPs/GR-Chit/GCE exhibited a high electrochemical catalytic ability to hydrogen peroxide (H2O2), due to the electrocatalytic synergy of GR and PtNPs. The redox behavior of the GOD/PtNPs/GR-Chit/GCE is a surface-controlled process. Finally, we obtained the amperometric response of the GOD/PtNPs/GR-Chit/GCE toward different concentration of glucose, and also achieved a sensitive glucose oxidase biosensor with a detection limit of 4.6μM glucose.
Structure of Nanometer Wide Heavy-Ion Tracks in Muscovite
Authors: Eyal Yehuda , Abu Saleh Sameer
Published: June 2013

Radial electron densities within 63-67 μm long ion damage trails,latent ion tracks, created in {001} muscovite by irradiation with 11.1-28.7 MeV/A U and Pb ions, have been derived by small-angle X-ray scattering. Track diameters are 8.0-10.2 nm. The tracks exhibit continuous and uniform electron density decrease of ~4%. Complementary microscopy has revealed loss of atomic order in the tracks. These ion-induced effects undoubtedly accelerate preferential through track permeability of inert and corrosive agents, a property that is important for track applications.
The Application of Modified Multi-Wall Carbon Nano-Tube Particles in PCM as the Nucleating Agent
Authors: Zhang Xi Yao , Niu Jian Lei , Wu Jian Yong , Zhang Shuo
Published: June 2013

Paraffin waxes as the phase change materials (PCM) usually tend to become supercooled in their crystallization processes, which limits their applications. As a solution, the modified multi-wall carbon nanotube (MWCNT) particles were dispersed in PCM as the nucleating agent to effectively reduce the super cooling, oxidized by strong acids H2SO4 and HNO3 to increase the compatibility with the organic liquid. In this study, the n-hexadecane-1-decanol slurry with modified MWCNT in different concentration was prepared and analyzed. Thermal analysis by differential scanning calorimeter (DSC) indicated that the super cooling of PCM was significantly decreased. The effective ranges of nucleating agent concentration were summarized which provided a promising way of improving the performance of system energy efficiency in building cooling and heating applications.
Polymer Nanocomposite Films with Functionalized MWCNTs
Authors: Grozdanov Anita , Tomova Ana , Paunović Perica , Dimitrov T. Aleksandar
Published: June 2013

Polymer nanocomposites with carbon nanotubes (CNTs) have become very attractive class of materials for numerous engineering applications since carbon nanotubes exhibit a high aspect ration, unique electrical, mechanical and structural properties. Functionalization of CNTs offer new potentials for other technical challenges of the polymer based nanocomposites associated with their specific interactions.
A biocompatible polymer matrices PMMA and PCL were used to provide good interfacial bonding between carbon nanotubes. MWCNT (d=30-50 nm, purity>95%) were used for preparation of polymer based nanocomposites with 0.2, 0.5 and 1.0 % w/w MWCNTs content. PMMA-based nanocomposites were prepared via the mixing of the MWCNT and polymer in a dichloromethane solution for 24 h, while for the PCL-based nanocomposites as a solvent tetrahyrofurane was used. Functionalization of the CNTs was performed in acid (HNO3) and alkali (NH4OH+H2O2) medium as well as by additional thermal oxidation at 490°C. Characterization of the nanocomposite films was performed by DSC, TGA, WAX, FTIR and SEM. The obtained results have shown that introducing MWCNT into polymer matrix significantly changes have been found in the properties of the obtained nanocomposites.
The Effect of Crystalline Rice Husk Silica on Polysulfone Membrane for Wastewater Treatment
Authors: Harun Zawati , Shohur Muhamad Fikri , Yunos Muhamad Zaini , Jamalludin Mohd Riduan , Ismail Ahmad Fauzi
Published: June 2013

This study investigates the effect of additive rice husk silica and Polyethylene glycol(PEG) at different concentration on of Polysulfone (Psf) ultrafiltration (UF) membranes. The polymer membranes were prepared by a phase inversion method using Polysulfone (PSf) , N-methyl-2-pyrrolidone (NMP) as a solvent and distilled water as non-solvent. The performances of the membranes were measured in term of pure water flux by using distilled water and solute rejection at different wastewater concentration at 50%, 75% and 87.5%. The results demonstrated that the addition 2% and 3% rice husk silica give the good rejection for membranes but the best rejection was at membranes contains 3% rice husk silica where successfully do rejection of 80.5%. As a conclusion,the range between 2%-3% of rice husk silica gives the ideal composition based on the result of flux permeation and rejection.
Alignment of Integrated Photonic Devices Based on Improved Particle Swarm Algorithm
Authors: Zhu Meng Peng , Zheng Yu , Duan Ji An
Published: June 2013

A novel automatic alignment algorithm of integrated photonic devices based on improved particle swarm algorithm is proposed. The combination of dynamically changing inertia weight and selection mechanism is used in the standard particle swarm algorithm to overcome the premature phenomenon in alignment search process, which improves the global search ability and convergence speed compared to particle swarm algorithm. The method used in engineering can significantly improve the alignment and coupling efficiency of photonic devices.
Target Tracking Based on QPSO Algorithm
Authors: Ni Yao , Xu Wen Bo
Published: June 2013

This article paper proposes a FCM based QPSO algorithm to establish the mathematical model and simulation including the algorithm introduction, modeling and simulation. In the designed system , data is firstly clustered into classes by c-means algotithm so that each rule defines its own fuzzy sets, the number of fuzzy rules is also determined by the number of clusters..Then Quantum-behaved particle swarm optimization learning algotithm then used for optimising the parameters of the system. We illustrates the algorithm in details with computer simulation to solve nonlinear problems and compare the rusults between basic PSO and our algorithm.
Melt Polycondensation and Analysis of Hydroxyl-Terminated Poly(L-lactic Acid) Using Small Molecular Diols as Terminating Agents
Authors: Che Jing , Yang Rong Jie
Published: June 2013

The synthesis of hydroxyl-terminated poly (L-lactic acid) (PLLA) by direct melt polycondensation of L-lactic acid and use of small molecular diols as terminating agents was investigated. L-lactic acid was dewatered to prepare the dehydrated prepolymer at first. Then PLLA was prepared through melt polycondensation in a melt with catalyst system including TSA, SnCl2and Sn (Oct)2. Finally, ethylene glycol, 1,4-butanediol, and 1,8-octanediol, respectively, were used in hydroxyl termination of the PLLA. The molecular weights and end-group structures of all products were characterized by gel permeation chromatography (GPC) and1H-NMR. DSC and Disc Polarimeter were used to characterize crystallinity and racemization, respectively. The results show that two kinds of hydroxyl-terminated PLLA polymers were obtained: complete hydroxyl-terminated PLLA prepared by using ethylene glycol or 1,4-butanediol, incomplete hydroxyl-terminated PLLA prepared by using 1,8-octanediol or combination of two kinds of diols. Combination of ethylene glycol or 1,4-butanediol with 1,8-octanediol can reach high hydroxyl termination of PLLA, and maintain the molecular weight by decrease of alcoholysis at the same time.1H-NMR was found as an effective estimating way for extents of reactions. The hydroxyl-terminating reactions of PLLA by the diols reduced the crystallinity and resulted in racemization to some extent.
Study Based on Piecewise Drying Process of Corn Seed Multi-Purpose Drying System
Authors: Zhao Wu Yun , Shi Zeng Lu , Li Yan Jing , Yang Zheng , Wei Li Juan , Jiang Wu Yang
Published: June 2013

In order to improve the processing properties of corn ear and the utilization of drying equipment, and reduce energy waste, a set of multi-purpose drying systems which using the piecewise drying process was designed. It was divided into dry storage and wet storage according to the different moisture content of corn seed .The wet storage worked with minor-cycles drying, and the dry warehouse worked with a large circular drying. The corn ear was unloaded and delivered to threshing area for threshing operations when its moisture content reached 18%, then dried to safe storage moisture. Experiments show that the system could dry maize ear in short time, the piecewise drying process can reduce energy consumption and production costs 20% to 30%, and improve the average precipitation rates 4.2% compares with the traditional drying process. Meanwhile, the rate of seed crushing is decreased 1% to 1.5%.
Key Subsystem Identification of the CNC Machine Tools
Authors: Zhu Xiao Cui , Chen Fei , Li Xiao Bing , Yang Zhao Jun , Kan Ying Nan , Wang Li Ding
Published: June 2013

In order to find the key subsystems which affect the reliability of the CNC machine tools is an important and yet harder problem due to the lack of failure data and statistical analysis. A novel method based on posterior probability function for identifying the key subsystems of the CNC machine tools was proposed. Firstly, subsystem reliability of the CNC machine tools was estimated using the John estimator, since the failure data were censored. Secondly, parametric fitting was conduct with Weibull distribution using the maximum likelihood estimation (MLE) or the least square estimation (LSE). Thirdly, the probability function of each subsystems were attained by the reliability modes of the systems and the whole system. Finally, a case study was given, which proved that the proposed method could find out the key subsystems rapidly and accurately.
Research on Deep Seam Floor Water-Bursting Assess System
Authors: Sun Ming , Zheng Wen Xiang , Ma Kai
Published: June 2013

Deep seam floor water-bursting is a complicate nolinear geomechanics system, whose factors are coupling and influencing each other. By building the asses index system, it gets each factors function of water-bursting. According to the four different grey controlling indexes, the main controlling factors are put forward by the grey correlation calculation and nine factors theory is out. Based on the different weighting methods, the entropy adjusting the ancient is used to ascertain the main factors contribution weights, combined static weight with dynamic weight well, so it can provide the comparably correct result for the mathematics model building and discrimination system development.
Design and Implementation of Controllable Noise Source
Authors: Zhang Deng Pan , Gao Zhi Qiang
Published: June 2013

To meet the characteristic diversity need of noise source in the product sound quality research, a parameter-controlled noise generation method is presented. The developed method is based on speech signal processing and programming. The system architecture of the controllable noise source is studied, and the implementation method of each module of the system is detailed. Modular design achieves data transfer and parameter control flexibly and conveniently between modules such as system calibration, basic acoustic signal production and conditioning, audio output control. Programming implement a controllable noise source platform based on the Visual C + + with friendly interface and reliable output.
Study on a Novel Piezoelectric Accelerometer with Switch Characteristic
Authors: Yu Run Xiang , Shi Geng Chen , Hu Dan
Published: June 2013

A novel piezoelectric accelerometer with switch characteristic was introduced. The accelerometer is composed of top head, cross elastic beam, base core, insulation cylinder, mass block, piezoelectric elements, and the base etc. The accelerometers structure and operating principle were presented and its mathematic model was established. Test results show that the accelerometer can filter out high frequency vibration signal, which the out signal is smooth compared with the conventional piezoelectric accelerometer, furthermore with good linearity. It can be used in the smart fuze to take the place of conventional piezoelectric accelerometer in order to recognize the target accurately.
An Improved Hardware System of Excitations Pulse on X-Waves with Direct Digital Synthesizer
Authors: Li Ya Qin , Chen Dan , Yuan Cao
Published: June 2013

Limited diffracting waves such X-wave have great potential applications in the enlargement of the field depth in acoustic imaging systems. In practice, the generation of real time X-wave ultrasonic fields is a complex technology which involves precise and specific voltage for the excitations for each distinct array element. In order to simplify hardware system of excitations pulse in X-wave, the complex excitations were instead by simple driving, which combination of rectangular and triangular driving pulses. The improved hardware system consists a computer for communication with the circuit, universal serial bus (USB) based micro controller unit (MCU) for data transmission, field programmable gate array (FPGA) based Direct Digital Synthesizer (DDS), 12-bit digital-to-analog (D/A) converter and a two stage amplifier. DDS generate arbitrary waveforms with a single, fixed-frequency reference clock, which satisfy the need of complex excitations pulse of X-wave. From the simulations of hard system, the difference of waveforms at different radius between theoretical waves is reduced in 0.41%.
Charge-Sensitivity-Oriented Analysis of Quantum Point Contact Sensor Based on the Landauer's Formula
Authors: Chen Hua , He Liang , Wang Ting Lan
Published: June 2013

The effect of temperature is introduced to Büttiker transmission coefficient formula, and combined with current model and noise model in Landauers picture, temperature-dependent conductance and noise could be estimated. The expression of intrinsic sensitivity is approved, which is proportional to the square root of noise, and capacitance electrostatically coupled with environment, and inversely proportional to differential transconductance. In terms of the capacitance range of QPC, the intrinsic sensitivity is estimated, and it is clear that the present QPC charge sensor still has space to improve sensitivity.
A Low-IF 2.4 GHz Integrated RF Receiver for Bluetooth Applications
Authors: Jiang Lai , Liu Shao Hua , Yu Hang , Li Yan
Published: June 2013

In this paper, a low-IF 2.4 GHz integrated RF receiver for Bluetooth is presented. Designed in a 0.18 μm CMOS technology, the receiver consists of LNA, mixer, complex band-pass filter, and GFSK demodulator. A received signal strength indicator is also employed in the receiver to auto adjust the receiver gain. In this paper, the structures of the major modules were analyzed, and the simulation results are presented and discussed.
Joint Synchronization of Timing and Frequency Algorithm Based on Training Symbol in SC-FDE Systems
Authors: Wu Lei Lei , Cheng Nai Ping , Liu Xu Guang
Published: June 2013

Common joint synchronization of timing and frequency algorithms based on training symbols are analyzed. Training symbols are discussed and then a new algorithm based on training symbol with special structure is proposed and applied in SC-FDE (Single Carrier Frequency Domain Equalization) systems. The proposed algorithm absorbs the advantages of the common algorithms and comparison between different algorithms shows that the proposed algorithm achieves better performance.
Edge-Based Gaze Planning for Salient Proto-Objects
Authors: Kim Doo Jin , Lee Heon Cheol , Lee Tae Seok , Lee Kong Woo , Lee Beom Hee
Published: June 2013

Selective attention of primates or human being has been modeled and implemented by many vision researchers in a decade. And also several attempts, which improve object recognition using selective attention model, have existed. But there are few researches in the gaze planning for the results of selective attention process. Therefore we propose a planning method based on edge information in the attended regions. And we explain the edge description methods (edge density and entropy) and also propose a new description method, edge uniformity. We evaluate the performance of the methods in the viewpoint of attentive object recognition.
Universal Wireless System for Advanced Biomedical Applications
Authors: Stankus Martin , Prauzek Michal , Jirka Jakub
Published: June 2013

This paper deals with implementation of wireless communication into a biomedical system including presentation of acquired experience. The aim of the paper is usage of universal wireless system for advanced biomedical applications. There are many biomedical applications with prospect of implementation of wireless communication. IEEE 802.11 wireless module WISMC01 by Laird is one of commercially available wireless solutions. Module provides various communication interfaces and inputs - RS232, analog to digital converters and digital GPIO pins among others. Module supports proprietal scripting language for user defined scripts. Various aspects of hardware and software development and wireless security are discussed in this paper.
Dependence of Damage-Induced Magnetization on the Plastic Deformation for X80 Steel
Authors: Wan Qiang , Wei Li Ming , Zhou Zhen Kai , Li Yun Fei
Published: June 2013

Metal magnetic memory (MMM) method is a novel, passive magnetic method for inspecting mechanical degradation of ferromagnetic components. In this paper, the correlation between plastic deformation and the deformation-induced magnetic field was experimentally investigated for the X80 steel. Various tensile plastic deformations are introduced into test pieces with different initial discontinuities. The surface strain distributions and normal natural magnetic fields component are measured after the tensile testings. The results show that the normal natural magnetic fields component are effective in capturing different deformation stages under tensions, the relationship between the intensity of damage-induced magnetization and the maximum plastic strain follows a simple formula proposed in this paper.
A Study of Different Fluid Droplet Impacting on Dry and Wet Surface
Authors: Huang Qi Yu , Zhang Holden
Published: June 2013

The droplet impacting on dry and wet surface is studied. Splashing was not observed with the impacting velocity up to 600 cm/s for vertical impingement on dry solid surfaces. Transition to splashing happens when the steel surface is wetted and the dry surface is inclined. There is a relationship between the impacting angle and impacting velocity for the transition boundary. The transition impacting angle increases with the increase of the impacting velocity.
Preparation and Characteristic of Composites with Wheat Straw Woodceramic / Attapulgite
Authors: Wu Wen Tao , Tan Fang Liang , Xu Feng
Published: June 2013

This paper mainly introduces that the wheat straw, attapulgite and phenolic resin, curing agent respectively usded as raw materials and the auxiliary materials , and those were finally prepared as a new composite carbon material through the processes of mixing, drying ,hot pressing, as well as high temperature sintering. The different sintering temperatures and different ratios of different materials were fabricated, then the material physical strength, density, porosity, strength, resistivity and other properties were tested. After which, the performance, formation mechanism and formation law were analyzed ,the effect of the choice and ratio materials and the temperature to the preparation as well as the properties of composite materials were preliminarily discussed, Identified as wheat straw: attapulgite = 2: 1; 3: 1, a temperature of 700 to 800 DEG C when all the material physical properties of ideal.. This experiment showed that wheat straw as raw materials for preparing attapulgite feasibility. At the same time, the presented work also opens up new research directions to the reuse utilization of wheat straw ,the application of attapulgite as well as research of woodceramics composites.
Adsorption Efficiency of Garcinia mangostana Linn. (GML) Shells Based Activated Carbon
Authors: Lutpi Nabilah A. , Khalik W.Fadhilah W.M. , Abdullah C.K. Kairulazam C.K. , Wong Yee Shian , Ong Soon An , Izhar T. Nuraiti T.
Published: June 2013

The objective of this study is to investigate the adsorption efficiency of Garcinia Mangostana Linn. (GML) shells based activated carbon using two synthetic dyes which are methylene blue and acid orange 7. The parameters which were studied in batch mode are the effect of contact time, initial dyes concentration, particle size, adsorbent dosage and temperature. Scanning Electron Microscope (SEM) was used to determine the physical characterization of GML. Base on the percentage removal results, the basic dye (Methylene blue) depicts better performance if compared to the acid dye (Acid orange 7) with approximately 90% of the best percentage removal of Methylene blue.
Review of Key Technologies and Application Status of Flywheel Energy Storage Systems
Authors: Yang Li Ping , Ren Zheng Yi , Han Yong Jie , Yin Gui Sheng
Published: June 2013

The working principle of Flywheel Energy Storage Systems (FESS) is described. Then the FESS's key technologies are analyzed: FESS is an integrated system which has the feature of multidiscipline intersection. To improve its performance indexes, the rotational drag, electromagnetic coupling and created heating of FESS should be decreased. Therefore, the key technology affecting FESS includes flywheel design, magnetic bearings technology, high-speed rotor dynamics, motor/generator and energy conversion technologies, and long time maintaining vacuum technology. Lastly the FESS's application status is discussed: With the development of key technologies, the application of FESS has extended to the fields of UPS, grid, marine etc.
Preliminary Study on Microstructure of Jute Fiber
Authors: Qian Jing Fang , Tang Yi Yong
Published: June 2013

This article analyses the microstructures, including crystallinity, orientation degree and IR spectrum, of both Chinese jute and Bangladesh jute. Their microstructure changes after treated with acid, alkali and oxidants have been studied.
A New Energy Concept to Minimize Electricity Consumption in Industry or Buildings
Authors: Cristofari C. , Motte F. , Notton G. , Canaletti J.L.
Published: June 2013

A new concept of flat plate solar collector is presented: its originality comes from its remarkable shape and from its integration into a rainwater gutter. The complete solar collector consists in several short modules connected serially. After a brief presentation of the building energy problem, the new patented solar collector is described and the two thermal experimentations are shown. A numerical model is developed in Matlab® 15 environment using a finite difference model and an electrical analogy. At last, the thermal model is validated from experimental data under various meteorological situations. The adequacy of the model with the experimental data is shown for various temperatures inside the solar collector and for the water temperatures.
A Novel Method to Measure Flange Thickness and Rim Width of Wheel Sets on Line
Authors: Ji Jian Chun , Shao Shuang Yun , Feng Qi Bo
Published: June 2013

The flange thickness and rim width of the wheel sets are key parameters which ensure the train security. This paper proposes a novel real-time method to measure flange thickness and rim width of wheel sets based on laser displacement sensors. Three laser displacement sensors are cramped on the steel rails. The light of sensors travels through the slit between rails, reaching a point which is 12mm below the wheel set tread. The flange thickness and rim width can be measured by three laser displacement sensors together. This non-contact method realize dynamic and real-time measurement of the wheel sets parameters. The measurement error is 0.2mm, which meet rail industry standards.
Optimal FBG Sensor Installation Process for Crane SHM System
Authors: Wang Xin Hua , Wang Dong Hui , Huang Guo Jian , Wang Wei Xiong , Guo Zhong Liang
Published: June 2013

In order to improve the accuracy of measurement results, we should do our best to reduce the optical loss while welding FBG Sensors and adopt appropriate bonding technology. Taking simple tools and suitable approach can also achieve good result. We take three steps while welding FBG sensors, the steps are manufacture end face, welding, and heat shrinkable. Manufacturing end face of a fiber is the key step among them. It is important to adopt the sequence diagonal welding method and use a damp cloth to cool the other parts of the sensor while welding which can increase the accuracy of measurement. Use pen-made red light to check the fiber joints.
Shear Viscosity of Inhomogeneous Hard-Sphere Fluids
Authors: Hoang Hai , Galliero Guillaume
Published: June 2013

Using molecular dynamics on Hard-Sphere-like fluids subject to an external sinusoidal field inducing density inhomogeneities and undergoing a bi-periodical shear flow, we have studied the local viscosity of the inhomogeneous fluid. It has been shown that for a slowly varying density profile the local average density model combined with the well-known models proposed in the density function theory yields a good description of the viscosity profile obtained by molecular simulation. However, for a rapidly varying density profile these models are unable to describe correctly the viscosity profile obtained by molecular simulations. So, to overcome the weakness of these models we have proposed a simple model that takes into account the effect of the angle formed by the colliding molecules and the direction of the flow.
Evaluation of the Performance of Cylinder Liner under Dry Reciprocating Wear Conditions
Authors: Haider Farag , Gebril Mohamed A. , Elkoum Salah M.
Published: June 2013

The aim of this work is to study the wear behavior of the cylinder liner of internalcombustion engines, using reciprocating wear testing machine and study the effect of operating conditions (Rotating speed, length of stroke and normal load) on the wear behavior in dry sliding. A statistical analysis method was applied to study the interaction effect of these parameters, and effect of each parameter. Results obtained showed that the wear characteristics is effected mainly by the normal load (P), and stroke length (L), and the rotating speed (R) has no significant effect on the liner wear. The study also showed an interaction effect of normal load (P), and stroke length (L) together on the wear of the liner.
Numerical Analysis on Collision Process of Rigid Body and Box Girder
Authors: Xiong Rui , Shi Jun Feng , An Qun Hui , Yu Tian Qing
Published: June 2013

Through analyzing the real collision process of a steel plate rolling sliding off a lorry and box girder flange of an overpass, the damage degree of box girder may be known, and in this article the collision process is also simulated by means of finite element method so that it may be obtained how the damaged girder collapses and the cracks propagate. Furthermore, the dynamic characteristics are studied during the collision process and the reliability of overpass section collision is analyzed from the angle of energy transfer and dissipation.
The New Vehicle Condition Monitoring Indicator VPR and its Short-Time Prediction ARMA Model
Authors: Wu Jing Jing , Li Qi Chang , Wang Guang Long , Gao Feng Qi , Qiao Zhong Tao
Published: June 2013

The vehicle storage & transportation condition monitoring system focuses on the real time acquisition and processing analyses of life cycle environmental temperature and humidity, shock and vibration stress and the attitude and position information of Vehicle, it is the effective supplement of vehicle equipment maintenance and management. Based on the vehicle storage state information defining a new index early warning rate vehicle predictive rate (VPR), and establish the ARMA forecasting model. The experimental results show that the model can slow the short-term trend fast track prediction to the small capacity samples of the VPR, and that about 12% of high precision. Prediction results help to establish the vehicle equipment maintenance quality management plans for the vehicles those in complex difference transportation environment, and their performance status is not the same.
Smart Coating Sensor Applied in Crack Detection for Aircraft
Authors: Liu Ma Bao , Li Bin Bin , Li Jiang Tao , Lian Yuan Yuan
Published: June 2013

Monitoring fatigue cracking of large engineering structures is a costly and time-intensive process. The authors present a low-cost smart coating sensor (SCS) consisted of driving layer, sensing layer and protective layer typically that can detect crack initiation and growth. The results show that the smart coating sensor can detect cracks above 300μm, corresponding to the increment of the sensing layer’s electric resistance at the level of 0.05Ω. Therefore, the development of SCS is of importance significance in the substitution of an existed inspection that requires substantial disassembly and surface preparation, and, thus, can find numerous applications in difficult-to-access locations on aircrafts.
Method for Dynamic State Monitoring of Pressure Vessel
Authors: Ma Xue Rong
Published: June 2013

The life prediction is to estimate the life while the flaw initial size and critical size are knows. On the contrary, the life control is to estimate the flaw initial size at the predetermined life. Nondestructive test would be used to detect the flaws whose sizes are bigger than the allowable initial size estimated by the method, and corresponding repair or replacement of parts or components would insure the reliability and safety of structure in its lifetime. Aiming at this problem, the fixed amount relation between undetected probability of flaw of in service pressure vessel and the independence examination times is established in the base of examination results before. The ability of nondestructive testing is availably increased, the undetected probability of flaw of in service pressure vessel is controlled within the scope of an enough low and safe level. dynamic state monitor is realized.
Influence of Bonding Quality for Piezoelectric Sensors with Applications to Lamb Wave Damage Detection
Authors: Gao Dong Yue , Wu Zhan Jun , Wang Yi Shou , Liu Ke Hai
Published: June 2013

In this paper, the propagation characteristics of Lamb waves activated and collected by piezoelectric sensors bonded on an aluminum panel were investigated both theoretically and experimentally on different bonding cases. The bonding layer is an intermedium of energy transmission between structure and sensor. The bonding quality heavily effects on the lamb propagation characteristics, including frequency dispersion, mode conversion, and signal amplitude. In particular, the variation of the surface strain with frequency for symmetric lamb mode was studied in different bonding quality. A sensor bonding quality evaluation method based on frequency response characteristics of the surface strain was developed to compensate the sensor network. The proposed approach can provide a useful reference for structural health monitoring strategy formulation.