bluuebunny/crossref_metadata_2025 huggingface dataset:
The Aerodynamics of a Cornering Inverted Wing in Ground Effect
Authors: Keogh James , Doig Graham , Barber Tracie J. , Diasinos Sammy
Published: May 2014

For racing car configurations an inverted wing produces negative lift that allows increased levels of acceleration to be maintained through corners. Routine aerodynamic analysis, however, will typically be in the straight-line condition. A numerical analysis of the inverted T026 wing geometry through the curved path of a constant radius corner was conducted. The asymmetrical properties of the oncoming flow resulted in the introduction of a rolling and yawing moment along the span, as well as side-force. Yaw angle, flow curvature and a velocity gradient resulted in changes to the pressure distribution over the wing surface. Primary vortex behaviour was observed to differ significantly in both direction and structure.
Computational Simulation of Mechanical Microenvironment of Early Stage of Bone Healing under Locking Compression Plate with Dynamic Locking Screws
Authors: Miramini Saeed , Zhang Li Hai , Richardson Martin , Mendis Priyan
Published: May 2014

It is well known that bone healing outcomes highly depend on the mechanical microenvironment of the fracture site, and a certain degree of interfragmentary movement (IFM) is essential for indirect (i.e. natural) bone healing. The application of locking compression plate (LCP) internal fixation in the treatment of bone fracture is a common practice which leads to early mobility and full function of the fractured extremity. However should the fixation configuration be too stiff, it might result in delayed healing or asymmetric tissue development across the fracture site due to the fact that IFM in near cortex area is too small to promote healing. Dynamic locking screw (DLS) has been recently designed to tackle this problem by reducing the stiffness of LCP fixation. However, the actual mechano-regulation mechanisms in which DLS uses to regulate the healing process are still not fully understood. The objective of this paper is to develop a computational model to understand the change of mechanical microenvironment of fracture site under LCP with dynamic locking screw in comparison to standard locking screw, and how this change could potentially regulate tissue development within the fracture callus during the healing process.Keywords: bone healing, locking compression plate, dynamic locking screw, finite element modelling
Drying Kinetics, Quality Changes and Shrinkage of Two Grape Varieties of Italy
Authors: Senadeera Wijitha , Adilettta G. , di Matteo M. , Russo P.
Published: May 2014

Two varieties of grapes, white grape and red grape grown in the Campania region of Italy were selected for the study of drying characteristics, moisture diffusion, quality changes (colour) and shrinkage behaviour. Comparisons were made with treated and untreated grapes under constant drying condition of 50o C in a conventional drying system. This temperature was selected to represent farm drying conditions. Grapes were purchased from a local market from the same supplier to maintain the same size of grapes and same properties. An abrasive physical treatment was used as pretreatment. The drying curves were constructed and drying kinetics was calculated using several commonly available models. It was found that treated samples shows better drying characteristics than untreated samples. The objective of this study is to obtain drying kinetics which can be used to optimize the drying operations in grape drying.
Parallelization of DEM-LBM Using Domain Decomposition
Authors: Li Jun , Cui Xi Lin , Chan Andrew H.C. , Bridgeman John
Published: May 2014

The coupled Discrete Element (DEM) - Lattice Boltzmann Method (LBM) often suffers from the high computational cost due to the fine meshes used. The intrinsic parallel nature of DEM-LBM makes it possible to be applied to the analysis of realistic engineering problems using parallel computer. In this paper the domain decomposition is implemented in the validated coupled DEM-LBM code FPS-BHAM and its performance is tested. A parallel efficiency of 0.72 has been achieved by using 32 processors, which shows a very good parallel behaviour of the DEM-LBM. Besides, the feature of ‘pseudo-vector processing capacity’ boosts the parallel behaviour of LBM with domain decomposition.
Effect of Technology for Semi Solid State Cooling Plate on Primary Carbides and Mechanical Property of Hypereutectic High Chromium Cast Iron
Authors: Liu Shi Bin , Meng Xiang Cai , Li Hong Bo , Zhao Xing Ming
Published: May 2014

In this paper, research the hypereutectic high chromium cast iron by the methed of semi-solid method for cooling inclined plate. Influence of cooling rate on size of primary carbides and mechanical property of hypereutectic high chromium cast iron. The results showed that, speed up the cooling speed can effectively refine eutectic primary carbides in hypereutectic high chromium cast iron. The primary carbides was globularity and slug, provided with excellent mechanical properties. But when the cooling speed is too fast, the pouring temperature is too low, so that the liquid metal has high viscosity, poor mobility. there were a small amount of inclusions in the Preparation of casting. Although still generate pieces of fine carbides in the matrix, but the distribution is not uniform. disadvantage of the comprehensive performance.
Photoluminescence Property Study on Patterned Growth of Aligned ZnO Nanowire Arrays
Authors: Zhao Hai Yan , Fu Ming , He Da Wei
Published: May 2014

The patterned ZnO rods were fabricated by the photoresist pattern covered sputtered ZnO film assisted hydrothermal deposition.The ordered ZnO nanorods were prepared by the reaction in sodium citrate and Zinc nitrate solution. The sodium citrate and photoresist hole works together for crystallization vertically to the c axis of ZnO. A UV emission at 395nm and an intense green-blue emission peak at 580nm were observed from the ordered ZnO nanorods which reflect the crystallization of ZnO rods. The influence of different growth reaction times and micro-sized holes on the photoluminescence property and crystal quality of ZnO nanowires arrays were investigated.
Conductive Polyaniline and Paper Reinforced Composites
Authors: Yan Jin Hua , Xu Ren Mei , Yun Na
Published: May 2014

A novel method of direct aniline multi-interfacial polymerization on paper substrate is introduced in this paper. Cellulose base papers with and without PAE reinforced were discussed. The PANI-paper composites after more than 3 polymerizations had much lower surface resistivity. Their mechanical strength and thermal stability were analyzed by tensile test and GTA. FTIR results explained that there was strong interaction between NH groups in aniline monomers and OH groups in fibers. Conductive composites made with PAE treated paper had both good thermal stability and good mechanical strength with high conductivity.
Three Dimensional Radiation Feature Calculation for Terahertz Photoconductive Antenna Based on FDTD Method
Authors: Lian Fei Yu , Jin Guang Feng , Fu Mai Xia
Published: May 2014

It is photoconductive antenna for terahertz generation and detection to be applied widely as a radiation resource. It has a significant application prospect in many areas such as terahertz imaging, spectrum detection and so on. In this paper, we proposed a 3-D radiation feature calculation method for terahertz photoconductive antenna using Finite Difference Time Domain (FDTD), and elaborated the influence of semiconductor drift current, diffusion current to electromagnetic field based on the radiation principle of photoconductive antenna. According to actual application condition, we simplified drift equation and continuity equation, and obtained the iteration equation of current density, electric field and magnetic field, and at last, we illustrated a calculation flow of radiation properties of photoconductive antenna.
Analysis on Energy Loss of SVC Based on TCR and FC Mode Method
Authors: Zhou Jia , Tan Xiao Long , Wang Wen Bin
Published: May 2014

In recent years, as the SVC device have also been used for DC ice melting system, the installment is still on the rise, it is necessary to study the loss situation. This paper firstly analyzed the theory of the loss of its each part of the device, and then finished a simulation based on the PSCAD software. We hope the research can give some value guidance on SVC assembled for the power grid.
Research on Microgrid Frequency Control With Droop Characteristic Based on Lagrange Interpolation
Authors: Li Jia Ming , Li Peng
Published: May 2014

The operating status of the microgrid is given, currently three classic control modes of microgrid isintroduced. And a method is put forward, which is a improved active power-frequency droop control method based on Lagrange interpolation.This method can effectively guarantee the stability of the microgrid running frequency. The correctness of the method is confirmed through the simulation.
Study of Selecting RO Scale Inhibitors Based on the Conductivity Titration Curves
Authors: Zhang San Feng , Liu Hu Lan , Xi Da Da , Yang Lin , Hu Meng Sha , Li Mao Dong , Liu Juan , Wei Jia Qiang , Yu Yuan Chun , Zhou Bai Qing
Published: May 2014

This paper discusses a selecting method of Reserve Osmosis (RO) scale inhibitors, which is fast and convenient. Five kinds of RO scale inhibitors (A-E) are used to explore the feasibility of the method, drawing their conductivity titration curves to evaluate their properties. The results show that, using the rapidly-dropping point of the conductivity titration curves to select the RO scale inhibitors can illustrate the preferential order of the scale inhibiting properties is B≈E>D>C>A.
The Electricity Performance of Flexible Piezoelectric Generator
Authors: Liu Guo Hua , Sui Li , Shi Geng Chen
Published: May 2014

A FPEG (flexible piezoelectric generator) composed of PVDF (polyvinylidene fluoride) piezoelectric film, conducting resin and titanium alloy substrate, which occupies less room and produces electrical energy while the axial wind flows through the oscillator surface. When the axial wind flows through the generator surface, generator begins to vibrate and produce electrical energy, as the wind speed reaches a critical value, generator yields resonance phenomenon. In this paper, more work was placed on how the substrate structure parameters such as length, width and thickness affected the power generation capacity in resonance mode.
The Design and Application of Intelligent Socket in the Smart Home System
Authors: Liu Kai , Qi Yin Cheng
Published: May 2014

The Smart Home is an important realization of the environments of intelligent electricity. As an essential part of the system, smart home smart sockets and the gateway work together to achieve the function of the on-off control, intelligent control, data acquisition and overload protection, etc. In this paper,the smart socker was designed and composed with the CC430 series processors introduced by TI , the power module, metering module and relay control module .At last, each module was tested accordingly.
Study on the Application of CSAMT in Geothermal Exploration in Jilin Province
Authors: Wu Chuan Peng , Zhang Xiao Pei , Du Li Zhi , Wang Yong
Published: May 2014

Geothermal resource is a kind of clean energy source. There is rich fracture structure in Jilin city of Jilin province and it has a good geothermal geological conditions. Using CSAMT method and selecting the appropriate technical parameters, we can survey controlled thermal structure in the measured area. The collected data is processed and combined with the known geological and hydrological condition. Interpreting the data, base fluctuations and spatial distribution of buried faults can be got. Then, deep groundwater-rich region and the depth of reservoir burial are inferred.
FPGA-Based Dual-Probabilities CSMA/CA Control System Design
Authors: Liu Zheng Gang , Ding Hong Wei , Ma Xiao Hui , Liu Qian Lin , Xiong Jia Long
Published: May 2014

This paper presents a protocol to improve traditional CSMA protocol: DP-CSMA/CA protocol. In this paper, it is used in the design of WSN communication system based on FPGA. By using the method of the averaging period, we give the throughput parameters of this improved system. Simulation results confirmed that the DP-CSMA/CA protocol improves the system performance. The FPGA design is also effective to improve the performance of module in WSN. We completed the design of system based on DP-CSMA with FPGA. The test results show that: throughput are improved, packet collision is reduced, and channel utilization is improved in different load. This system has the features of simple circuit, high reliability, and programmable upgraded.
Design and Simulation of Automatic Transition Control System for Helicopter Based on Model Reference Adaptive
Authors: Liu Yu
Published: May 2014

In order to achieve the anti-submarine capabilities of helicopter, it is essential to design the automatic transition controller. According to the basic requirements of automatic transition control mode and the rational use of limiter and exponential law, the control loop of altitude and ground speed is designed. And the control between the two channels must be coordinated, so that when altitude descends to hovering altitude, ground speed close to zero simultaneously. In this paper, the method of model reference adaptive is used to correct the altitude deviation which makes altitude trajectory followed the set rules. The simulation shows that the method can make the altitude trajectory track the desired trajectory in good.
Research on Loading System of Landing Gear Turning Test Based on Single Neuron PID Controller
Authors: Ling Yu
Published: May 2014

This paper designs a single neuron PID controller for the loading system which can simulate the load in the process of landing gear turning. As artificial neurons have the adaptive, self-learning and more fault-tolerant characteristics, the controller based on single neuron PID can improve performance of loading system. To assess the effectiveness of controller, united simulation between Matlab/Simulink and AMESim was conducted. Obtained results show the proposed approach is satisfactory in fast response, small overshoot, high control accuracy, strong anti-interference ability and robustness when compared with traditional PID controller.
Study on System Design Scheme for Electrical Control Scheme of Boiler
Authors: Li Xiao Jing , Gao Zhi Hua , Wang Di , Yu Dong Man
Published: May 2014

The breeding plumbing boiler is a full automatic temperature adjustment system with double efficacy of winter heating and summer cooling, constituted by host, auxiliary engine, control system and plumbing pipes, etc. Intermediate between PLC output port and AC contactor is to achieve the isolation between weak current and strong current, enhance the reliability of the system. Two frequency changers are designed for the hardware of system. Frequency converter input power linked up front access air switch. Frequency converter input terminals main circuit switch and the three phase power through air connection, frequency converter main circuit output terminals connected to the contactor three-phase motor. It is proved by field experimental operation that the control system proposed not only can realize automatic control of boiler burning process efficiently, but also reduced energy consumption greatly and effectively improved the level of boiler control management.
Fluorescence Enhancement of ZnS Nanocrystals via Ultraviolet Irradiation
Authors: Peng Ling Ling , Liu Bi Tao , Han Tao
Published: May 2014

ZnS nanocrystals were prepared via chemical precipitation method and characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) and photoluminescence (PL) spectra. The results indicated that the ZnS nanocrystals have cubic zinc blende structure and diameter is 3.68 nm as demonstrated by XRD. The morphology of nanocrystals is spherical measured by TEM which shows the similar particle size. The photoluminescence spectrum peaking at about 424 nm was due mostly to the trap-state emission, and a satellite peak at 480nm ascribed to the dangling bond of S in the surface of ZnS nanocrystals. The emission intensity of ZnS was enhanced after ultraviolet irradiation, the enhancement of the Photoluminescence intensity was due to the elimination of the surface defects after ultraviolet irradiation, for the growth of the coated shell on ZnS nonacrystals, the Photoluminescence intensity was increased as ultraviolet irradiation time growth, finally tends to be stable for the surface state of nanocrystals steady.
Dynamic Object Tracking Based on KAZE Features and Particle Filter
Authors: Xia Ying , Xu Xin Hao
Published: May 2014

Accuracy and stability is crucial for dynamic object tracking. Considering the scale invariance, rotational invariance and strong anti-jamming capability of KAZE features, a method of dynamic object tracking based on KAZE features and particle filter is proposed. This method obtains the global color features of the dynamic object appearance and extracts its local KAZE features to construct the object model first, and then performs dynamic tracking by particle filter. Experimental results demonstrate the accuracy and stability of the proposed method.
Vibration Signal Time-Domain Characteristic Extraction for Coal and Rock Recognition at the Fully Mechanized Top-Coal Caving Face
Authors: Zhu Shi Gang , Xue Guang Hui , Zhao Xin Ying , Liu Er Meng , Wu Miao
Published: May 2014

In order to avoid the over discharge and less discharge situations, improve the coal recovery rate and promote the working environment of workers at the fully mechanized top-coal caving face, experiments for the research of the coal and rock character recognition were carried on underground. Vibration signal at the hydraulic support tail beam and the rear scraper conveyor under different conditions were acquired at the fully mechanized top-coal caving face using the self-developed mine portable data recorder. The time-domain indexes of the vibration signal were analyzed. Results show that the variance, skewness index and kurtosis index changes most obviously under various stage of top coal caving and can be used as the time-domain characteristic indicator for the coal and rock character recognition in the fully mechanized working face.
Fast Fourier Transform Measuring the Phase Difference Based on MATLAB
Authors: Huang Qing Qing , Shao Jian Long
Published: May 2014

This paper expounded the principle of using Fast Fourier transform measuring the phase difference and completed the simulation of measuring the phase differences of a plurality of signal. The simulation results show that the method can rapidly and accurately realize the phase difference measurement without considering the AD quantization error and noise interference. In considering the AD quantization error and random noise, Fast Fourier transform measuring the phase difference still has high measurement accuracy, and the measurement error can be controlled within 0.01°. The method can be applied in practical engineering.
The Application of Transient Electromagnetic Method in Detecting the Corrosion of Heat Distribution Pipeline
Authors: Hu Bo , Liu Jian , Yu Run Qiao
Published: May 2014

Leakage of the heat distribution pipeline will seriously affect the safety of residents and cause economic losses. This paper presents the transient electromagnetic method (TEM) for detecting the corrosion of buried heat distribution pipeline, which mainly introduced the principle of the TEM to detect the pipeline and the general detection method. Combining with an instance of corrosion detection of buried heat distribution pipeline in a certain street in China Hohhot, the detection results were analyzed and the feasibility of this method was proved through excavation. The results show that the TEM can detect the uniform corrosion distribution of buried metal pipeline and it’s effective and practical for detecting the buried heat distribution pipeline. The TEM could provide a new method for guaranteeing the safe operation of the heat distribution pipeline.
Measurement of Stress Attenuation Effect in the Sand under Explosion Wave
Authors: Li Xiao Mao , Wang Ming , Guo Xian , Li Yan Jie , Peng Ying Cheng
Published: May 2014

The paper introduced computing method of stress wave for structure’s surface in sandy soil medium,discussed matching error between piezoresistance pressure transducer and sandy soil medium.Stress wave of structure’s surface in sandy soil medium be measured by pressure sensor,the experimental data indicate that sandy soil can improve concrete structure’s shock resistance.
Monitoring and Control System Design for Tool Wear Condition of CNC Machine Based on Artificial Neural Networks
Authors: Su Dan
Published: May 2014

Spindle wear of CNC machine affects the working efficiency of the machine. To solve this problem, the reasons for the generation of CNC machine tool equipment wear is analyzed, the system's hardware modules and software modules are designed and implemented in accordance with the system requirements. Parameters such as input and output power, spindle speed of CNC machine tool equipment are acquired by the sensor circuit. After a comprehensive analysis of the data, system software combined with neural network model displays the test results on the LCD screen, real-time output of CNC machine tool equipment operating status and the spindle wear. Thus the operation of CNC machine is ensured and equipment failure is avoided. Through the system test, indicating that the proposed system can real-time output the monitor results of spindle wear of CNC machine tool equipment, and has high measurement accuracy for the main parameters such as power and efficiency of the equipment.
Application of the Smart Integrator in the Ship-Borne Radar Servo System
Authors: Tao Min , Wang Xin Rong , Zhang Gui Ping
Published: May 2014

Along with improvement of capability of the precision measurement radar, the servo system with more high capability is needed. A large antenna reduces rigidity and structural resonance frequency of antenna system, and it is even possible to make radar lose the target. Based on analyzing Ship-borne servo system, the model of servo system has been set up and intelligent integral has been applied in the Position Control Loop. The result of simulation shows that this method can decrease overshoot of the servo system and improve the quickness of the servo system.
A Numerical Method for Tracking the Deformation of Fluid Particles
Authors: Chen Shuai , Fang Le , Qu Bo
Published: May 2014

A model for the deformation of fluid particle under the action of velocity gradient tensor is proposed in this article. In this contribution, the control volume/surface is geometrically simplified into micro-ellipse. By using a series of changes of basis and eigenvalue decomposition, a numerical method for the deformation of an elliptic fluid particle is then demonstrated. Finally, this method is applied in two different problems involving smoothed particle hydrodynamics (SPH) simulation and a passive scalar turbulence case.
Digital Simulation of Ecological Industry Development Based on Grey Clustering Algorithm
Authors: Shi Hui
Published: May 2014

In order to protect the ecological environment of grassland and improve the living standards of the people in the prairie and promote the harmonious development of the economic environment, the state proposes ecological migration project. How to ensure the collaborative development of subsequent industry is the topic concerned the state and society. This article discusses the status and problems of subsequent industrial development after the grassland ecological migration and constructs subsequent development model based on gray clustering model. In order to verify the validity of the model, the paper establishes and analyzes computer simulation system. The result shows that the development model based on gray clustering algorithm can make an accurate assessment on the follow industry trends of grassland ecological migrant which provides reference for following industrial development of grassland ecological migrant.
Research on Horror Video Recognition Algorithms
Authors: Yang Pei , Song Wei , Yang Guo Sheng , Guo Qi Zhen
Published: May 2014

Video content recognition has attracted more focus these years. In this paper, a basic procedure is introduced and the features used for affective recognition are presented in the categories of vision feature, audio feature and emotion feature. Classical algorithms using in affective recognition are introduced, and we studied the strength and disadvantage of the algorithms. At the end, some advises are given to help improving content recognition.
A Novel Map Matching Algorithm
Authors: Cai Guo Yong , Lv Rui , Wang Li Yuan , Wu Hao
Published: May 2014

Presently, most of the researches on Map Matching focus on high sampling rate and accurate GPS points. This paper discusses a challenging problem with low GPS sampling rate and some continuous points with large deviation. To solve the problem efficiently, a novel matching method named F&PT is proposed. Firstly we employ a new method to generate sets of candidate roads. The GPS error analysis based on points is translated into based on roads. Secondly, a local strategy based on potential real trajectories is applied to solve the core problem of selecting an optimal road from the sets which contain only two candidate roads. In this approach, we consider not only the spatial location information and orientation angle information but also the influence of local points on the matching point from a new sight. We evaluate our method based on a real trajectory dataset. The experiments show that the proposed method has a higher accuracy compared with the related methods, e.g. ST-matching algorithm and IVMM algorithm, when the sampling interval is less than 210s.
Numerical Investigation of Convection Heat Transfer in Pipes with Sintered Porous Metal Rings
Authors: Yang De Zhi , Dong Meng Long , Lu Xin Wei , Zhou Zhao Yao
Published: May 2014

Fully developed turbulence single phase convection heat transfer of water in pipes filled with sintered porous metal inner rings or solid inner rings was investigated numerically respectively. Numerical calculations were conducted with the Fluent 6.3 code, using the SST k-ω turbulence model. Comparing to solid-ring turbulator pipes, porous-ring turbulator pipes have better comprehensive heat transfer effect. The maximum PEC for porous-ring turbulator pipes is 4.4 and the PEC of solid-ring turbulator pipes is less than 1. It was also analyzed effect of geometric structures on porous-ring turbulator pipe performance. f/f0 for porous-ring turbulator pipes increases with the increasing of Re while Nu/Nu0 decreases with the increasing of Re ,and PEC decreases with the increasing of Re. With the same Re, if the width of the porous ring is equal to the width of groove, f/f0, Nu/Nu0 increases and PEC decreases with the increasing height of porous ring. When the height of porous ring is constant, the f/f0, Nu/Nu0 and PEC decreases with the increasing height of porous ring under the same Re.
Design and Implementation of High Speed and Real-Time SAR Signal Processing Module Based on TMS320C6678
Authors: Feng Yang , Hu Shan Qing , Li Qing , Long Teng
Published: May 2014

In order to meet the requirements of high speed and real-time in SAR processing system, as well as breaking the bondage that traditional processing board is subject to the algorithm. This paper designs a generic mass storage real-time signal processing module with TI's latest multi-core DSP-TMS320C6678 based on OpenVPX high-speed serial bus standard. This module has standardized, modularized, reconfigurable characteristics. This paper discusses the design of this module and the implementation of typical parallel SAR imaging algorithm mapping on this module. This peocessing module has been applied in a variety of airborne SAR radar signal processing systems and fully validated its powerful processing ability and versatility.
Mosaic of UAV Aerial Video by Integrating Optical Flow Computation and Fourier-Mellin Transformation
Authors: Wu Jun , Luo Ming Cheng , Li Jun
Published: May 2014

UAV Video is rapidly emerging as a widely used source of imagery for many applications in recent years. This paper presents our research on the mosaic of UAV video for the purpose of harbor surveillance. First, one new framework on estimating video frame transformation with Optical flow is presented in this paper. For this new framework, fewer number of Gaussian pyramid is created for implementing for the multiresolution approach and thus, more details for optical flow computation is well kept; Second, we make a discussion on using Fourier-Mellin Transformation in image frequency domain to estimate initial motion parameter of adjacent video frames and with those initial motion parameters, small displacements for optical flow computation can be achieved; The experimental results demonstrated that the mosaic image generated from aerial video shows satisfied visual quality and its surveillance application for fast response to time-critical event, e.g., flood, is descried.
CRFs Based Chinese Word Segmentation
Authors: Gui Kun Zhi , Ren Yong , Peng Zhao Meng
Published: May 2014

Chinese word segmentation is a fundamental problem in natural language processing. CRFs (Conditional Random Fields, CRFs) is an undirected graph model. It can work well with a variety of features, full use of the text information. Thus, this article adopts CRFs based Chinese word segmentation. This paper first gives the definition of CRFs model, the model parameter learning methods and reasoning algorithms. Then, it introduces the word tagging system which is widely used in Chinese word segmentation. The Bakeoff 2005 corpora are used in Chinese word segmentation experiments, and we achieve an excellent result on both MSRA and PKU corpora. The F-Measures on both corpora are 0.964 and 0.943, while the ROOV Values are 0.705 and 0.765.
Array Grating Lobe Elimination of F-MIMO HF Radar with Colocated Antennas
Authors: Yang Qiang , Hou Xian Mei
Published: May 2014

Multiple-input multiple-output (MIMO) radar with frequency diversity (f-MIMO) is applied to HF radar. An array processing model of f-MIMO HF radar is developed. To eliminate the grating lobe of f-MIMO radar beamforming, two approaches are proposed. One is to apply particle swarm optimization (PSO) algorithm to select the optimal carrier frequency combination. Another is to extract array elements from the virtual receive array to get the optimal sparse array structure, and the simplified physical receive array structure is proposed. Simulation results demonstrate the effectiveness of the method proposed.
Curve Correspondence in Two-Dimensional Space
Authors: Wang Kang , Wu Zhong Ke , Zhao Jun Li
Published: May 2014

Curve or contour correspondence has been extensively explored. Previous work was mainly concentrated on the rigid correspondence or alignment. This paper presents a spectral analysis method to resolve the problem of curves correspondence with non-rigid deformation. Using the embedding of original affinity matrix to the spectral domain, we can build the point correspondence of no-rigid deformation shapes.
The Parameter Estimation of Non-Cooperative Frequency Hopping Signals Based on the Algorithm of RSPWVD
Authors: Lv Jin Fei , Han Yu , Liang Xiao Peng
Published: May 2014

How to get good time-frequency distribution of FH signals is crucial to detect and to trace the FH signals. The theory about the rearrangement of time-frequency distribution is summarized in the paper, then the basic principle of detecting the signals using the algorithm of rearrangement of the smooth pseudo Wigner-Ville distribution (RSPWVD) is analyzed in detail, and the algorithm expression are given at the same time. The analysis results show that the RSPWVD algorithm not only has more ideal anti-jamming effects, but also can enhance the time-frequency aggregation of the signal, so the signal parameters are estimated more accurately. In the end, the computer simulation is shown to test the feasibility and effectiveness of the algorithm.
Image Overlapping Technique without Model for Large LoD Terrain Based on GPU
Authors: Han Yuan Li , Chen Yan Ping
Published: May 2014

There are many difficulties in image overlapping in 3D terrain of dynamic LoD quad tree model, it will cause gaps between terrain tiles and images if both of them are expressed independently. This paper breaks through the LoD mesh difficulties, and realizes image overlapping based on GPU programming without modeling. It establishes different texture coordinate transformational relationships in GPU to realize seamless expression between terrain texture and overlapping image based on setting terrain vertexes with global unified texture coordinate. The affine transformation is adopted to solve the difficulty of multiple spatial nonlinear transformations aiming to the interaction of image overlapping, and also to solve the non-synchronous problem of texture coordinate in interaction. At last, the conclusion may be achieved. Image overlapping technique in LoD terrain without modeling based on GPU is a typical case of render technology to solve application difficulties, the realization is simple, efficient and steady which only faces to single terrain tile. This research will greatly enhance the ability of Digital Earth, which completely clear an important technical barriers and promote the applications in GeoDesign.
Cramer-Rao Bound for Parameter Estimation in Narrowband Bistatic MIMO Radar
Authors: Li Li
Published: May 2014

The problem of Cramer-Rao bound for parameter estimation in norrowband bistatic Multiple-Input Multiple-Output (MIMO) radar system is considered. In this paper, we propose a new narrowband signal model to accurately estimate parameter from a moving target. The Cramer-Rao bound for target parameter estimation is derived and computed in closed form which shows that the optimal performance is achieved. Target location and parameter estimation performances are evaluated and studied theoretically and via simulations.
The Study of Building-Height Inversion Based on the Shadow of High-Resolution Satellite Images
Authors: Li Cong , Chen Zheng Chao , Cui Jia Jie , Wang Meng
Published: May 2014

With the rapid development of the remote-sensing technology, more and more high-resolution remote-sensing data that currently available for rapid-assessment of the earthquake, disaster investigation and the extraction of building information are arised. Researching on the building-height inversion used the shadows of building has made some progress, but the formula was simple, the object of research was ideal as well. The paper gives the relation of building-height and shadow considered the impact of buildings, building-shadows, sensors, and the impact on the structure of shadow-image of relative position of the building with the sun. The advantage of this method is not only given to the relationship between the trend line of the building, the building, the sun, and the satellite, but also does not require to extract the shadow of the building. In order to make the calculation of the building-height more accurate, it is entirely visual-judgment. Using the proposed method of the paper to invert the building-heigh in Changping district of Beijing, calculating the relative error, indicating that this method is feasible and effective.
Development of Marine Diesel Engine Database Based on Web
Authors: Pang Shou Wen , Song Xiu Fu
Published: May 2014

The combination of marine diesel engine traditional multimedia teaching material database and Web database developed the Web database based on. The system development environment, system function, system architecture and database gateway technology are analyzed in the paper. Further this database plays a role in the network education in now.
Internet of Things Technology Implementation by Applying SDLC Model: The Intelligent Storage Management System
Authors: YANG Lv Qing , Bi Ying Yao
Published: May 2014

Based on the Model of the Systems Development Life Cycle and the concept of The Internet of Things, the development of The Smart Storage Management System will follow the stages of The System Research, The Feasibility Analysis, System Design, System Implementation, System Testing and Software Maintenance. The Paper will focus on the steps and skills in every stage to make sure the key points in the development and pay attention to some stages which need methods like Scrum. In this way, the Development of the Storage Management will go on safely and suit customers’ demands very well.
Design of Networked Control System with Time-Delay and Packet Loss
Authors: Liu Lan , Yin Xun He
Published: May 2014

For Networked Control System (NCS) with random network-induced delay and packet loss, an observer is designed to reconstruct the states using output values. A piece-wise time-delay strategy and the timestamp technique are used, improving the system performance. Depending on whether data dropout occurs or not, system is modeled as an Asynchronous Dynamical System (ADS), and theorem guaranteeing the system closed-loop stability is also given. Based on Lyapunov and Linear Matrix Inequality (LMI), controller gain and observer gain are solved and TrueTime toolbox is used to verify the effectiveness of the algorithm.
A Novel Cluster Based Survivable Routing Protocol for Wireless Sensor Network
Authors: Wang Hai Tao , Chen Hui , Zhang Xue Ping , Yan Li
Published: May 2014

Sensor nodes easily suffer from failure, attack or capture because of the limited energy, storage, communication ability, complex and severe network environment when WSN is applied to emergency or battlefield environment. Thus, the basic scout mission is influenced. In this paper, a survivability route protocol named SRPC in cluster-based WSN is put forward. The protocol uses key negotiation and identity authentication mechanism to resist the attacks of malicious nodes; when the main cluster head is destroyed, monitoring data will be transmitted to the base station by the backup cluster head chain. The simulation results show that, SRPC protocol can not only resist the attacks of the enemy malicious nodes based on energy balance, but also assure reliable delivery of the packets after the cluster head is attacked or destroyed. As a result, the survivable ability of WSN in battlefield is improved.
Real Time Dynamic Evaluation and Interactive Performance Test Based on Network Architecture
Authors: Liu Ting Ting
Published: May 2014

BBS's speech in the public opinion has great impact on students’ emotion. If we can regulate public opinion of university BBS of, and deal with the speech with cross impact on students' moral emotion timely, which can make the BBS having good cross and the interaction impact on students' ideological and moral emotion. In this paper we use the MyEclipse5.1 version to expand the public opinion module of the forum, and use with chasing method to calculate the value of object function in the network public opinion evaluation, and join the moral evaluation module in the network architecture. The main function of this module is to optimize the evaluation process of the forum, realize the real-time evaluation of network public opinion, and eliminate the negative cross influence of network evaluation on students' moral emotion.
Numerical Analysis and Performance Test of Interactive Platform Based on Multi-Media Internet Architecture
Authors: Wei Can Xin
Published: May 2014

Streaming media technology is also known as streaming media technology. Users can experience playing while downloading function, which improves the transmission speed of multimedia information on the internet. In this paper, we use streaming media technology, combined with the parabolic interpolation and Newton interpolation algorithm, design multimedia interactive platform of the college students' ideological and political education and comprehensive education. The overall structure of the platform is composed of multimedia, streaming media distribution equipment, school network, clients of teachers and students. On the internet between the teachers and students, student and students they can communicate ideological and political. In order to test the performance of network, we use the iperf software to test packet loss rate and delay characteristics of the network. The results show that Newton interpolation method has better delay characteristics, parabolic interpolation algorithm has low packet loss rate. It provides technical reference for the application of multimedia technology in the ideological and political education.
QoS-Aware Dynamic Virtual Resource Management in the Cloud
Authors: Li Ying Kui
Published: May 2014

Virtual resource management is a key issue in cloud computing paradigm. This paper focuses on the long term/short term virtual machine rental problem. A learning algorithm based on statistical learning techniques for resource requirement is proposed, and a dynamic virtual machine rental algorithm is given. These algorithms minimized the operational cost while preserving predetermined Quality-of-Service (QoS) specification. A simulation platform is constructed, and end users’ arrivals are generated according to a Markov Modulated Poisson Process (MMPP) to simulate the load in the real world. The effectiveness of the proposed algorithms are tested via extensive numerical studies.
Computer Network Behavior Research Based on the Theory of Complexity
Authors: Zhou Xiong
Published: May 2014

Guided by the thought of system integrity, complex behavior of computer network is thoroughly study based on complexity theory. Based on chaos theory complex behavior property of computer networks traffic with different time-scale is deeply researched, the result indicates the universe of the chaos and scale-free behavior in real computer networks. The network behavior evolvement model that correctly describes function mechanism of general real networks is presented, and formal description of the evolvement rules is implemented, the fluctuations formula of input traffic is also deducted. Based on the mean field model of network traffic, the dynamical properties of network traffic system is analyzed, and the condition of chaotic dynamical behavior is achieved under mean field hypothesis.
Effect of Annealing Temperature on the Soft Magnetic Behavior of Sendust Powder Core
Authors: Wei Ding , Wang Xian , Feng Ze Kun , Gong Rong Zhou
Published: May 2014

The variation of soft magnetic properties of Sendust powder cores as a function of annealing temperature has been investigated. Toroid-shaped Sendust powder cores were prepared from Fe-Si-Al powder by machine pulverizing and subsequent cold pressing using inorganic insulating layer and organic binders, respectively. The influence of different compaction pressures and various annealing temperature on effective permeability and quality factor was investigated. Sendust powder cores using inorganic salt as insulating layer exhibit high effective permeability ( μe>110) up to 1 MHz, showing excellent frequency stable characteristics and high quality factor (Q>80) at 50 kHz. The optimized annealing temperature is 953K.
Simulation of Sealing Performance of Elastomeric O-Ring Gasket Including Metal Skeleton
Authors: Zhang Guo Liang , Zeng Zhi Bin
Published: May 2014

In the hydraulic and pneumatic equipments, the elastomeric O-ring gaskets are widely used to ensure their sealing. The sealing capability of an elastomeric O-ring gasket depends upon the contact stresses that develop between the O-ring and the surfaces with which it comes into contact. In order to increase the strength and service life of the general elastomeric O-ring gasket, this gasket including metal skeleton is gradually applied to the actual product in recent years. In spite of the sealing performance of the elastomeric O-ring gasket has been investigated in many literatures, few information of it is known about the elastomeric O-ring gasket including metal skeleton. If any gasket degrades or fails, the overall operation and performance of the production will be affected. This paper aims to study the contact stresses occurred on the metal skeleton seal structure under the various interference fits with three sectional forms (trapezoid cross section, square cross section and circular cross section). Finite element analysis is used to predict sealing performance of an installed metal skeleton seal, providing a normal force against the sealing surface. Results gained show that the contact stresses occurred on the metal skeleton seal is larger than it generated on the general elastomeric O-ring gasket. Furthermore, the metal skeleton seal possessed trapezoid cross section can produce the maximum contact stress, which will show the best sealing performance among three sectional forms.
How to Design the E-Government Secure Cloud
Authors: Xu Shui , Liu Bang Fan , Liang Kai Yu
Published: May 2014

Nowadays, cloud computing is the innovative product of the upgraded of information science technology. It is another great change following the transition from large scale computer to client-server in the last century. The concepts, such as cloud security, cloud storage, secure cloud, cloud hosting and cloud input, appeared after cloud computing. E-Government Information Security plays an important role in the development and establishment of E-Government. It is an important component part to use cloud security technology to establish our country’s E-Government secure cloud in current E-Government construction.
MIMO Physical Layer Network Coding Scheme in Two-Way Relay Networks
Authors: Xiao Ke , Jiang Hai Ying , Lu Yuan Yao
Published: May 2014

To enhance the ber performance of pseudo physical-layer network coding (ppnc) scheme, a new scheme called pseudo physical-layer soft network coding (ppsnc) scheme is proposed, ppsnc adopts soft information not hard decision information, and its ber performance is better than ppnc. Meanwhile ppsnc has no synchronization problem compared with physical-layer network coding (pnc) scheme. At the same time, we also discuss the performance of ppsnc in mimo environment. The simulation results show that mimo-ppsnc outperforms the other schemes.
Biological Conjugate between Antibody and ZnS Nanoparticles as Probe for Atomic Absorption Spectrophotometry Determination of Estriol
Authors: Zhang Chun Yan , Wang Chuan Tao , Wang Shu Hao , Du Ling Yun
Published: May 2014

ZnS semiconductor nanocrystals (NCs) were prepared by ways from primary materials of ZnCl2 and Na2S in water solution. Using the synthesized ZnS NCs, a polyclonal antibody-based ZnS-labelled immunosorbent assay for the determination of estriol (E3) was developed with atomic absorption spectrophotometry (AAS) as a detector. An immunoaffinity column was applied to testify conjugation between antibody and ZnS NCs. The linear range for determination of estriol is 40.0~600.0 ng.mL-1, and the limit of detection (LOD) is 10.0 ng.mL-1. Some serum samples have been analyzed with satisfactory results which are in good agreement with those obtained using ELISA. This work suggests the potential application of NCs as biological probes and AAS as detector in nonisotopic immunoassay.
Study on Microwave Curing of Polyurethane (PU)/Epoxy (EP) Interpenetrating Networks (IPN)
Authors: Mu Zhong Guo , Bai Xue Lian , Luo Yi Ding , Mei Jian Ting , Zhang Ming Hu
Published: May 2014

Microwave curing of PU/EP IPN was studied in this paper. Microwave curing IPN was prepared by means of intermittent microwave heating, The results indicates that microwave curing technique can shorten curing time remarkably. The microwave curing and thermal curing IPN have identical structure, tensile property of microwave curing IPN is better than that of thermal curing IPN, Impact strength of thermal curing IPN is slightly higher.