bluuebunny/crossref_metadata_2025 huggingface dataset:
Li0.95Na0.05Ti2(PO4)3/C with Good Performance as Anode Material for Aqueous Rechargeable Lithium Batteries
Authors: Zhu Jing , Liu Yong Guang , Tian Qing Qing , Wang Ling , Cao Ji Lin
Published: July 2014

Li0.95Na0.05Ti2(PO4)3/C nanocomposite was prepared by sol-gel method.The structure and morphology of the samples were characterized by XRD, SEM which showed the particles had typical NASICON structure and diameter range from 400~500nm. The electrochemical performance were tested by cyclic voltammetry and galvanostatic charge–discharge. Results show Li0.95Na0.05Ti2(PO4)3/C nanocomposite exhibitsmuch better electrochemical performance than bare Li0.95Na0.05Ti2(PO4)3.
Dynamic Characteristics of Arch Steel Tower in Construction Stages
Authors: Yu Li , Che Yan Yang , Wang Sen , Zhao Guo Hui
Published: July 2014

Based on Hangzhou Zhijiang Bridge, FEA models of arch steel tower in construction and completed stages are established by using ANSYS software. Before closed and completed are considered to compute the dynamic characteristics of different structural system for arch steel tower. The results show that the wind-reduced vibration can be generated easily. It can cause some bad effect on the construction, equipments and the safety of staff. So, some proper measures should be adopted to decrease the wind-induced vibration of arch steel tower in construction and completed stages. So, some meaningful references are provided for the further research on control of wind-Induced vibration for arch steel tower.
Inhibition of Return Effect Reversed by Perceptual Load
Authors: Liu Xing Juan , Fan Zhi Hao , Zhou Jian Zhong
Published: July 2014

Perceptual load theory was considered to resolve the conflict between early and late selection models. We investigated whether perceptual load work well using IOR paradigm. The results showed that IOR disappeared in different level of perceptual load. The results indicated the onset time of IOR was influenced by perceptual load, indicating that perceptual load hinder the spatiotemporal correspondence between the cue and target integration.
Based on ANASYS with Finite Element Analysis and Calculation of Cracked Pipeline
Authors: Zhu Xiu Mei , Lv Yu Ping
Published: July 2014

Pipeline in the entire oil and gas transportation industry play an important role and in the soil is corroded in order to produce the stress corrosion crack. The topic analyzes and calculates cracked pipeline with finite element method by use of ANSYS software mainly, and provides the theory basis for safety evaluation of pipeline.
Application of Rapid Prototyping Technology in Product Design
Authors: Li Dan Tong , Zhang Zheng , Deng Jia Wen , Huang Ming Yu , Wan Xiao Feng , Ni Hong Jun
Published: July 2014

The rapid prototyping technology was introduced, including its definition, principle and characteristics. The advantages of rapid prototyping technology in new product development were analyzed. Application of rapid prototyping technology in design of mechanical parts, industrial model, medical model, ceramic products, automobile model and products based on ergonomics was discussed. The feasibility of rapid prototyping technology in product design and the optimization direction was prospected.
AHP Effectiveness Evaluation of Electronic Warfare Command and Control System under Complex Electromagnetic Environment
Authors: Wang Guo Sheng , Qi Zong Feng
Published: July 2014

The effectiveness evaluation problem of electronic warfare command and control system (EWCCS) under complex electromagnetic environment is investigated by using the analytic hierarchy process (AHP) method. First, the evaluation hierarchy structures of EWCCS under complex electromagnetic environment are put forward and can be classified into target hierarchy, rule hierarchy and scheme hierarchy. Then, the AHP Algorithm is given as a preliminary knowledge to evaluate the effectiveness evaluation of EWCCS under complex electromagnetic environment. Finally, an effectiveness evaluation example of EWCCS under complex electromagnetic environment is considered by using AHP Algorithm.
Rotor Local Rubbing Fault Feature Analysis Based on Teager-Huang Transform
Authors: Liu Shang Kun , Tang Gui Ji , Pang Bin
Published: July 2014

An analysis method based on Teager-Huang transform for rotor local rubbing fault diagnosis is introduced. Firstly, the original vibration signal is decomposed into some Intrinsic Mode Function (IMF) components by using Empirical Mode Decomposition (EMD) approach, secondly, Teager energy operator is applied to estimate the instantaneous amplitude and instantaneous frequency of each IMF component, so the time-frequency distribution of the signal is obtained. The rotor local rubbing fault is simulated on a rotor test rig. The analysis results show that this method compared with Hilbert-Huang transform (HHT) can track the occurrence of rotor local rubbing fault better and can extract the characteristics of rotor local rubbing fault effectively. It provides a reliable method for timely and accurate diagnostic to the rotor local rubbing fault.
The Design of Multichannel Marine Seismic Acquisition Unit Based on ADS1282
Authors: Zhang Zhi Li , Zhang Ying , Chen Peng
Published: July 2014

For marine seismic data acquisition needs,a multichannel marine seismic data acquisition unit was designed,which used the 32-bit analog-to-digital ADS1282 as a core and Field programmable gate array (FPGA) as the acquisition controller.The unit can achieve multichannel seismic data sampling and transmission functions.The design fully used with the design ADS1282 chip integration,with the corresponding anti-jamming measures,not only simplified the circuit design,but also ensured the quality of signal acquisition and system stability.the design used FPGA to realize a multichannel hydrophone signal synchronization sampling.
Complicated Manufacturing System Dynamic Measure-Control and Intelligence Diagnosis
Authors: Ma Jun , Li Wei Wei , Liu Peng Ting
Published: July 2014

As an important mean to ensure machining accuracy, the dynamic measurement and intelligent fault diagnosis technology can be used in aviation manufacturing machine. In recent years, several theoretical results are gotten on weak signal feature extraction, multiple sensor information fusion of early fault identification as well as the set up of embedded online monitoring units. This article is the summary of those results, the existing problems is analyzed, and the trend of the development in this field is also discussed.
Design of Pneumatic Parachute-Packing Machine
Authors: Wang Ying Fei , Deng San Peng , Chen Bo , Zhang Lin Ling
Published: July 2014

As ground support equipment, drag parachute packing machine is used for packaging aircraft drag parachute. It is driven by high-pressure inert gas. Drag parachute will be compacted in the cylinder loading institution by high pressure. The overall structure of drag parachute packing machine is designed. The finite element analysis and structure optimization of drag parachute packing manipulator is completed. The pneumatic control system is designed. It provides an approach for drag parachute packing technology.
Design of Shock-Absorbing System for Disaster Rescue Robot
Authors: Xie Lei , Qi Yu Ming
Published: July 2014

Disaster Rescue Robot is a small caterpillar robot used for carrying first aid articles, reasonable shock-absorbing system is an indispensable part to reduce the rush of the ground because it has to plummet from a certain level to the ground when it works. We use the method of modular design in this article and design the landing gear based on the performance of conical spring in order to absorb some of the forces during a fall. Then the three-dimensional modeling software is used to establish the parametric model of the robot shock-absorbing system to provide an effective way for the design of the Disaster Rescue Robot.
Application of Viscous Pressure Forming in Aeronautics and Astronautics
Authors: Li Ji Guang , Zhang Jie Gang , Liu Jing Ping , Zhao Rui Feng , Li Yang , Li Yu Chen , Yu Shi Xiang , Wang Zhong Jin
Published: July 2014

Viscous pressure forming (VPF) is a new developed sheet soft-punch forming process in 1900s. The basic principle and characteristics of VPF are described. The applications of VPF technologies of nickel-based super-alloy corrugated thin-walled part, asymmetrical thin-wall part with variable diameter, super-alloy thin-walled part with variable diameters, corrugated thin-walled part with larger diameter and small section are presented. The results show that VPF is suitable for the forming of parts with high strength, low plasticity, super thin-wall and complex shaped.
Research on Preparation of Aluminum-Metal Coating and its Microstructure by Melting-Casting
Authors: Xue Xiao Feng , Zhou Ze Hua , Wang Ze Hua , Shao Jia , Yuan Huan Long , Zhong Zhao Jun
Published: July 2014

A sort of Aluminum-metal coating, which is characterized by a bi-layered structure of Fe2O3+Cr2O3+Al plus NiO+Al layers, was successfully prepared on steel substrate by melting-casting technique. The microstructure, the bonding status of the interface between the coating and the substrate, and the element distribution of the coating were studied. The results indicate that, there is an excellent bonding between the coating and the substrate, and no hole and gap in the composite is found out. Moreover, there is obvious element diffusion in the interface. The coating is composed of block phase, columnar grain, and dendrites. In addition, the elements present a uniform distribution in the interface but an obvious segregation in the middle of the coating.
Research on Disassembling Equipment for Construction Machinery Hydraulic Cylinder
Authors: Zhang Xing Hui , Zhang Jian Xin
Published: July 2014

Construction machinery hydraulic cylinder is usually discarded after service cycle. The residual value of discarded products can be recycled greatly by remanufacturing. Disassembly and assembly is the key process in hydraulic cylinder remanufacturing. The construction machinery hydraulic cylinder disassembly and assembly equipment is developed. Hydraulic power is adopted in this equipment. The clamping, positioning of cylinder tube is realized by hydraulic clamping mechanism automatically. The piston component pulling out or into cylinder tube is realized by hydraulic working mechanism automatically. This equipment has been applied successfully in the project of "key technology and equipment for construction machinery parts remanufacturing" in a research institute. The results indicate that the application of this equipment will not only increase the automaticity and efficiency remarkably, but also reduce the damage to hydraulic cylinder key part greatly.
Software Design of Micromouse Dash Motion
Authors: Zhang Hao Ming , Peh Lian Soon , Wang Ying Hai
Published: July 2014

Micromouse is a small autonomous robot, which must navigate itself through an unknown maze from the start to the destination, the main challenge for micromouse is to solve the maze and find the optimum path. Detailed design of best-path finder was given. According to the different dash mode combination, dash path of micromouse in complex maze was analyzed. Motion command generator is developed to generate list of the motion commands in order to guide the robot dash from the start to its destination.
Double DSP Communication Based on CAN Bus Interface
Authors: Deng Hong De , Yan Zhian
Published: July 2014

In view of the problems on communication in double DSP systems, various communication methods are compared and advantages of CAN bus are also presented. This paper introduces hardware and software of communication using with CAN bus in DSP systems. The registers configuration of CAN is described in particular. Data are received by interrupt and stored by double buffer. The scheme has been applied in a UAV flight control system which performs very well.
The Design of Portable Granary Thermometer
Authors: Qin Gang , Cui De Quan
Published: July 2014

This article designed a portable granary thermometer to solve the shortcomings of present similar products ,such as complex structures , high performance price ratio and lack of flexibility , this thermometer used ultra-low power microcontroller MSP430F149 and programmable temperature sensor DS18B20 as the main components, it can collect, display and store the temperature on a real-time basis . Based on actual use, this apparatus possess the advantage of complete function, low power consumption, easy to operate, low price, portable and wide occasions of application etc.
Research on Integrated Application of Multi-Display Technology in the Mobile Terminal
Authors: Mao Xiao Meng , Liu Jin Gao
Published: July 2014

Nowadays, the mobile display devices have become the most significant section of the mobile terminal. During nearly a decade development, lots of display technologies have been maturely applied in the mobile terminal instrument. This paper analysis the integrated application of several display technology utilized in mobile devices according to their characteristics, and predict the tendency of their development in the rapidly development stage of 3D display. Mobile terminal has become the mainstream of IT equipment, including intelligent mobile phone, pad computer and so on which is at a rapidly developing stage. On the other hand, currently technology on human machine interaction is concentrated in display devices, touch screen for instance.
Design of Remote Monitoring System of Temperature and Humidity Based on Internet of Things Technology
Authors: Wang Lei
Published: July 2014

Design a things related technology based on remote monitoring system of temperature and humidity, sampling using SHT10 digital temperature and humidity sensors, temperature and humidity variables, and data transmission through the RS485 serial bus interface, using AVR kernel 8 bit chip for processing, resulting in a host computer display temperature and humidity changes, the indoor multi node the environment through the test, system has stable function, good display data change, relatively low cost advantages.
Transmission Delay Monitoring Method in Intelligent Substation
Authors: Song Xiao Hui , Guo Zhi Zhong , Li Guo Bin
Published: July 2014

In view of the current situation of the development of smart substation, this paper analyses the standing domain information sharing, information network transmission delay effects on substation protection system. Based on above, advances the information transmission time delay of the solution. This paper uses the accurate computing information packet switches reside within the delay ΔT and into the sampling value (SV) message, giving to protection device. Protection device dependent on local time benchmark, the use of MU inherent latency and link to reside the total delay ΔT reduction received multiple interval sampling data of the moment, on the basis of implementing protection control function.
Flow Field Simulation in Water Washing Tank of Explosion-Proof Diesel
Authors: Long Ri Sheng , Lian Zi Sheng , Sun Shao Ni , Wang Qi Liang
Published: July 2014

In order to improve the cooling & purifying effect of exhaust, reducing the water-jetting phenomenon during working time, the waste-gas flow field simulation in water-washing tank of Explosion-Proof Diesel (EPD) was conducted through ANSYSCFX/Fluent. The results revealed the inner flow condition and outlet temperature of emissions in water-washing tank. It provided a reference for the future design and optimization of the water-washing tank of EPD.
Photometric Data Procession of the Swift/UVOT Instrument
Authors: Li Xiao Pan , Yang Cheng , Zhou Li , Yang Hai Tao
Published: July 2014

The Ultraviolet/Optical Telescope (UVOT) which is one of three scientific instruments onboard the NASA-led Swift satellite provides simultaneous ultraviolet and optical photometric data. We present the installing procedures of HEASoft software and the detailed method for using the HEASoft in UVOT photometric data processions. We focus on the application of photometry processes, and present the photometry of Quasar PKS 0537-441. The analysis of the photometric data shows that this source has extreme variations in optical and ultraviolet bands and the shape of photometric flux curves in each band is excellently in agreement with each other.
Design and Simulation of Airborne Circular Omni-Directional Slot Antenna
Authors: Ren Luo , Zhu Yong Zhong , Su Dan , Deng Xin
Published: July 2014

The airborne omni-directional antenna must not only satisfy the indicators of omni-directional horizontal requirements, but also have conformal shape with the surface of airplane. The common monopole antenna and microstrip antenna can not meet the above requirements. Under the background of the airborne antenna miniaturization and conformal demand, this article designs a kind of airborne circular slot antenna. The structure of the antenna is simple, which meets pattern VSWR < 1.4 bandwidth of 350 MHz to 376 MHz and meets pattern VSWR < 2 bandwidth of 338 MHz to 438 MHz .Its maximum gain within the operating frequency range can be 4.205 dB .
Comparison of Two Computing Method on Thermal Conductivity of Aluminum Nitride
Authors: Cai Xue Mei , Zhou Qian Neng , Wang Jing Mei
Published: July 2014

Thermal conductivity of aluminum nitride (AlN) has been calculated by density functional perturbation theory (DFPT) and quasi-harmonic approximation (QHA) combined with Debye theory in the paper. Debye temperature is evaluated respectively from sound velocity and heat capacity. From 300K up to 1000K, the predicted thermal properties in pure crystal AlN based on these two Debye temperatures are compared with each other and the latter shows excellent agreement with Slack’s experimental data. The relative difference based on Debye temperature from heat capacity is within the limits of ±5.5%. This agreement with experiment is due to the Debye temperature derived from capacity contains the temperature effect while describe the three phonon process.
Numerical Simulation and Experimental Study on Thawing Time of Cylindrical Frozen Food
Authors: Ji A Min , Niu Xin Chao , Tang Bo Ning , Li Fu Liang
Published: July 2014

It is very meaningful to predict the temperature and thawing time during the thawing process of frozen food in production and life, this paper proposes a physical model of cylindrical frozen food during the thawing process, combine the finite difference method with element balance method to solve the thawing time and the temperature at regional center R/2 and boundary nodes. Take the beef as an example for the experimental verification. Through numerical calculation and experimental verification, the maximum error between the theory thawing time and experiment is 8.4%. The results show that: it is highly consistent with the experimental results that using numerical method to predict the thawing time and temperature change curve, at the same time, the temperature maximum error in center area is 1.2°C, the temperature maximum error of R/2 is 0.8°C, the temperature maximum error of the boundary node is 1.5°C, so the numerical simulation in studying thawing of freezing food is fairly reliable.
POS Supported ADS40/80 Imagery Direct Geo-Positioning and Positioning Accuracy Optimization
Authors: Zhang Yan , Wang Tao , Feng Wu Fa , Fan Yong Hong , Rui Jie
Published: July 2014

On the basis of establishing direct geo-positioning model for three-line array sensor ADS40/80 images, in order to optimize the positioning accuracy, the self-calibration technology was used to update the ADS40/80 sensor imaging parameters. Moreover, the ADS40/80 camera error model and self-calibration bundle adjustment model were set up. Multi-groups of ADS40 data over the Songshan experimental field were used for direct geo-positioning and parameter updating experiments. Experimental results proved that the self-calibration adjustment technique can effectively update sensor imaging parameters and significantly improve image direct positioning accuracy.
3D Facial Shape Reconstruction from a Single Frontal Image
Authors: Ma Qian
Published: July 2014

In this paper, we propose an improved method for reconstruct 3D facial shape from a single frontal image. We use improved fast marching method to solve the Eikonal equation which can obtained from the method of shape from shading (SFS). In order to overcome the concave-convex ambiguity problems inherent to SFS, we find out the concave region and recover concave into the convex keeping the relative shape invariant to reconstruct the accuracy facial shape.
Single Frequency LD-Pumped 2.09 μm Cr, Tm, Ho: YAG Microchip Laser
Authors: Nie Yong Ming , Guo Ya Kun , Ding Xin , Guo Min Min
Published: July 2014

Single-frequency microchip lasers have been widely used in differential absorption radars, pulse coherent Doppler radars, pumping optical parametric oscillators, and etc. So theoretical analysis and experimental researches on the LD-pumped 2.09 μm microchip laser have important realistic meaning. According to quasi-three-level Cr, Tm, Ho: YAG(CTH:YAG) laser crystal working characteristics, the theoretical expression and relationship curve between the output optical power and 785nm LD-pumped power are obtained by theoretical calculating based on the pumping rate equation. The CTH:YAG crystal with 4mm diameter and 1 mm thickness is used to do experimental test. The corresponding three kinds of particle concentration are 0.85%, 5.9% and 0.36% respectively. When the crystal temperature is controlled at 10 °C, microchip laser beam output characteristic curve is obtained under different pump spots. The results show that when the pump spot diameter is 75um the maximum single-frequency output power is 32mW and when the pump beam is 100um the maximum single-frequency output power is 30mW. The corresponding optical to optical conversion slope efficiencies are 6.8% and 6% respectively.
A Chaotic Image Encryption Algorithm Based on a Dynamical Feedback Operation
Authors: Gu Guo Sheng , Ling Jie , Xie Guo Bo , Ou Yu Yi
Published: July 2014

This paper designs an image encryption algorithm with a dynamical feedback operation based on sensitive chaotic system. In the proposed algorithm, the piece wise linear chaotic map is selected to construct pseudo-random keystream sequences. The pseudorandom keystream sequences are used to permute and substitute the plain image data. To enhance the complexity and security of the algorithm, each pixel is dynamically confused by its two previous adjacent encrypted pixels which are specified by a quantized binary tuple derived from a chaotic element. Both theoretical analysis and experimental tests show that the proposed algorithm is secure and efficient.
Method Research on Based-Static Motion Image Retrieval
Authors: Sun Si Yu , Wu Chuan Sheng
Published: July 2014

In the face of mass movement of image data storage management and retrieval applications, traditional search techniques and methods have been completely incompetent. The emergence of the technology on Based-Static Motion Image Retrieval, points out a specific direction for the development of the field of information retrieval. First of all, the thesis analyze the basic principles of the Based-Static Image Retrieval technology and Based-Static Motion Image Retrieval technology. And the thesis discuss mainly the relevant key technologies and development situations whose based on the static motion image retrieval technology. Secondly, the thesis Introduce and analyze, briefly, the characteristics and application background of several motion image retrieval prototype system, which developed by the domestic and foreign research institutes.
Design of Optical Fiber Transmission System Based on Absolute Polar Duty Cycle Division Multiplexing (APDCDM)
Authors: Chen Xin Qiao , Tang Lin
Published: July 2014

This paper propose a new multiplexing technique which use the bipolar RZ signal to realize duty cycle division multiplexing (DCDM) ,we call it Absolute Polar Duty Cycle Division Multiplexing (APDCDM).Multiplexing and demultiplexing principle of APDCDM are analyzed. Here we have designed a optical fiber transmission system based on APDCDM of three users by Joint simulation with Optisystem and Matlab. Simulation result shows the feasibility of this system. By the analysis of signal energy, explain APDCDM can carry more users than DCDM.
Target Tracking Based on Improved Camshift and Kalman Filter
Authors: Ban Li Ying , Han Yue Hua , Wu Yan Hai
Published: July 2014

A tracking algorithm based on improved Camshift and Kalman filter is proposed in this paper to deal with the problems in traditional Camshift algorithm, such as tracking failure under color interference or occlusion. Firstly, the proposed algorithm improves the single color target model and presents a novel target model, which fuses color and motion cues, to enhance the robustness and accuracy of target tracking. And in order to increase the tracking efficiency, the algorithm combines Kalman filter with the improved Camshift algorithm by using Kalman filter to predict the position of the tracking target under color noises and occlusion. The experiment results demonstrate that the proposed algorithm can track the target object accurately and has better robustness.
Wavelet De-Noising Based on Genetic Adaptive Threshold Algorithm
Authors: Wu Guang Wen , Wang Chang Ming
Published: July 2014

The central step of de-noising in wavelet domain is the threshold selection. To get the best de-noising result, the threshold should be selected according to the noisy observation. This paper presents a genetic adaptive threshold method, which gets the optimum threshold in the sense of least MSE by using an estimation function of the signals’ MSE function. The simulation results with standard wavelet test signals shows that the operation speed of the proposed method four times the traditional continuous searching algorithm, moreover, the optimum threshold calculated is more accurate and reasonable.
Adaptive Image Feature Reduction for Object Tracking
Authors: Lin Cong , Pun Chi Man
Published: July 2014

A novel adaptive image feature reduction approach for object tracking using vectorized texture feature is proposed in this paper. Our contributions are three-fold: 1) a statistical discriminative appearance model using texture feature was proposed. 2) Majority of dimensions of the features are removed by judging their errors of the chosen distribution model. The remaining dimensions are most discriminative ones for classification task. The dimension reduction has advantages of reducing the computational cost in classification stage. 3) An adaptive learning rate was proposed to handle drifts caused by long term occlusion. Preliminary experimental results are satisfactory and compared to state-of-the-art object tracking methods.
Speech Airflow and Air-Pressure Signal Editing Platform
Authors: Lv Shi Liang , Jin Ya Sheng
Published: July 2014

Experimental phonetics development to today has undergone a long and complicated process. The field of study from the acoustic analysis of expansion to the physiological and perceptual field. Speech aerodynamics signal is one of the most important physiological signal language research, plays an important role in human phonation process. Air pressure signal as an important physiological signal, which has great significance to the study of speech physiology, mainly through speech aerodynamics equipment acquisition. In this paper, according to the need of research, established by MATLAB program analysis platform, can be edited on the speech, the airflow and pressure signal is better, which is more suitable for speech research.
Design of 2_DOF Simulation Platform for the Testing of Airborne Laser Communication APT System
Authors: Meng Li Xin , Zhao Ding Xuan , Bai Yang Yang , Zhang Li Zhong
Published: July 2014

Lightweight, flexible motion simulation is the demand of airborne laser communication optical transceive when apply to outside test. A new parallel 2_DOF platform that has the function of azimuth and pitching is put forword based on the analysis of airplane position-pose changes affect the performance airborne laster communication APT system, and the kinematics model is established by using closed-loop vector method. Kinematics model is right through the comparison of mathematical model and simulation results of ADAMS, which provides the reference and basis for the design of control system.
Luminescence Properties of Rare-Earth Co-Doped Phosphate Glasses for White Light Emitting Diodes
Authors: Chen Guo Hua , Kang Xiao Ling , Yang Yun
Published: July 2014

Ce3+/Tb3+/Sm3+ co-doped phosphate glasses were prepared by melt quenching method. The full colors including blue, green and reddish orange emitting were observed simultaneously in the photoluminescent spectra of the glasses at 377 nm excitation, and the combination of these three emitting allows the realization of white light emitting. The CIE chromaticity coordinate (x=0.339, y=0.331) of the emission from the glass is close to the standard white-light illumination (0.333, 0.333). Moreover, the tunable luminescent color and chromaticity parameters could be realized by varying the content of Tb4O7 dopant in the glass composition, which is promising fluorescent materials for white light emitting diodes applications.
Joint Estimation of Doppler and Time Delay of Wideband Echoes for LFM Pulse Radar Based on Fractional Correlation in Impulse Noise Environment
Authors: Li Li
Published: July 2014

A new method to estimate the Doppler and multipath time delay is presented in impulse noise environment. First, the Doppler is estimated by energy cumulation of multipath component based on fractional lower-order-frational correlation transform. Then, an order-reduced signal is reconstructed combining the Doppler with the prior knowledge of the transmitted signal, and the echoes signal is converted to many single-frequency signals. Finally, the multipath time delay is obtained by the fractional lower-order power spectrum method. The method is adapted for low SNR noise, can restrain the affection of the cross-items, and has a high time-delay estimation resolution. Some computer simulations are given in this paper and the results show that the new method is valid.
Discovering Frequent Itemsets an Improved Algorithm of Bit Vector and Graph
Authors: Liu Nai Li
Published: July 2014

Because of the weakness of traditional Apriori algorithm, this paper presents an improved algorithm for mining frequent itemsets, which constructs bit vector and graph, the algorithm deletes node and the adjacent edges according to the number of node’s edges, which need traverse graph to generate candidate itemsets and verify candidate itemset by bit vector. Experimental results show that the improved algorithm has better efficiency than Apriori algorithm.
A Novel Text Extraction Method from Pure Text Images Using Morphological Operations
Authors: Chen Xuan Qi , He Biao , Wang Guo Cheng , Li Yao Xin
Published: July 2014

This paper presents a new method to achieve effective text extraction using mathematical morphology. Firstly, the document is segmented and divided into several parts based on the layout. And then, every part is dilated to big connected regions, whose biggest skeleton will be extracted and serve as a structure element (SE). Finally, a proposed region-concatenated operation with the SE will be employed, whose result can be the input of subsequent OCR system. Experimentally, the proposed method is robust to noise, the text orientation, font style and size, language and layout.
Long-Range Communication Scheme Based on Majority Combing
Authors: Peng Yuan , Huang Xing , He Le , Cui Yan Ping
Published: July 2014

HF communication is a very important tactical communication method, which can achieve thousand-miles away communication through the ionosphere reflections without any infrastructure support. But HF communication quality is not stable for the ionosphere disturbance, multipath fading and propagation loss. In this paper, we propose a new long-range communication scheme based on majority combing. In the scheme, we use multi-point receiving and multi-copying transmission, which can significantly improve the communication success rate by utilizing the land-sites’ space diversity and the multi-packet’s time diversity.
Electromagnetic Scattering from Perfectly Conducting Periodic Rough Surfaces Using Improved Complex Images Method
Authors: Li Lin , Zheng Wen Chao
Published: July 2014

In this paper, an improved complex image method to derive closed form periodic Green’s function for problem of scattering from perfectly conducting periodic surfaces is considered. The complex image technique represents a close-form periodic Green’s function consisting of a finite series of real sources and two finite series of complex sources with complex locations and amplitudes. Then the integral equation with the complex images periodic Green’s function in the kernel is solved by the method of moments. Results and computational times obtained by this improved complex image method and the previous one are compared with those obtained by the spectral Kummer-Poisson’s method. Results show that the improved complex image method is more accurately than the previous one.
An Improved DFT-Based Channel Estimation Algorithm for OFDM System on Time-Varying Multipath Fading Channels
Authors: Ma Xin Li , Fan Tong Liang , Du Yong Feng
Published: July 2014

An improved discrete Fourier transform DFT-based channel estimation for OFDM systems is proposed. Conventional DFT-based channel estimator improved its performance by suppressing noise, but it does not completely suppress noise. In order to overcome the disadvantage, this paper proposed a gate method without requiring any channel statistical information. This method comprehensively considersthe effects of the power of the strongest path and the noises. Computer simulation demonstrates the performance of the proposed algorithms in terms of bit error rate.
Flattop Broadband Wavelength Conversion Based on Cascaded Second-Harmonic Generation and Difference Frequency Generation in Step-Segmented Quasi-Phase Matched Gratings
Authors: Wu Hai Dong , Guo Jin Song , Wu Yun Wen , Wang Zhao Xia
Published: July 2014

Bandwidth enhancement and response flattening of wavelength conversion based on single-pass and double-pass cascaded second harmonic generation and difference frequency generation in step-segmented quasi-phase matched (QPM) gratings are investigated. For the same waveguide length, high conversion efficiency, flat response and broad signal bandwidth can be obtained simultaneously by optimizing the poling period of the step-segmented QPM structure. The conversion bandwidths in a 3-cm-long five-step-segmented waveguide are 134 nm for single-pass scheme and 132 nm for the double-pass one, respectively, which are both over the whole conventional band and long-wavelength band. The ripple on the matching response can keeps less than 0.2 dB as well.
Wavelet Transform Adjustment Method Study in Color Image Enhancement
Authors: Zhang Zhi Gang , Yan Shi Qiang , Geng Peng
Published: July 2014

In order to improve the ensemble of color image, this paper proposes homomorphism decomposition—wavelet enhancement algorithm based on the basic principle of Wavelet Transform. We separate the incidence component and reflection component of the image by homomorphism decomposition, and then combine wavelet transform to enhance image as well as reserve details. The experimental result shows that the adaption and effect is obviously superior to MSRCR.
Long Reach 10-Gbps WDM-PON Based on Carrier Distribution and Coherent Detection for Upstream Transmission
Authors: Liu Ji Hong , Ma Yan Ping , Ren Shao Rui , Yang Yang , Zhang Bin
Published: July 2014

The wavelength division multiplexing passive optical network (WDM-PON) incorporated with colorless optical network units (ONUs) and centralized light source is the most promising approach for next generation PON. A cost-effective architecture utilizing coherent detection for upstream (US) signal is proposed to enlarge the reach of such WDM-PON systems. Simulation results show that a symmetric 10-Gbps WDM-PON with 80km error-free transmission is realized without using any optical amplifiers.
Analysis on Signal Extraction under Sudden Changing Noise Interference Based on Time Frequency Analysis
Authors: Nie Shao Hua
Published: July 2014

The illegal signal such as the intrusion signal which wanted to be embedded in the normal signal was analyzed for the extraction, and made the network environment be safe and pure, so the signal detection problem was shown as the key and important problem in the assurance of the safety of the network. The signal processing principle for the non stationary signal was analyzed firstly, and the new signal extraction method based on the Wigner Ville distribution and Hough transformation theory of the time frequency analysis. The original signal was filtered and detected, the spectrum analysis was got as the same time for the testing the detection property in the simulation. Simulation and experiment was implemented on the objects of the network intrusion signal with the real collection in the database. Simulation result shows that the performance of decreasing the noise and filtering is very good. The intrusion signal can be detected and extracted perfectly, and also it shows good value in the analysis of the network safety in practice.
Application and Research of Data Mining Technology in Communication Network Environment
Authors: Zhang Zhi
Published: July 2014

The abnormal data of communication networks are complex and diverse, it is difficult to recognize and mine the abnormal data accurately and effectively with traditional methods. In order to improve the recognition accuracy of communication network, a data mining algorithms based on the method of communication network abnormal data recognition is presented. Firstly, the communication network data samples are analyzed for fuzzy c-means clustering in order to obtain the degree of membership matrix. Secondly, the training samples of communication network abnormal data mining are selected according to the membership. At last, the training samples are put into the least square support vector machine learning, which establish the model of abnormal data identification in communication network. The performance of the algorithm was tested by simulation tests, and the results show that, the abnormal data recognition efficiency and accuracy in this paper was improved much more than the traditional identification methods.
Enhancement Algorithm of Color Fog Image Based on the Adaptive Scale and Multi-Parameter Correction
Authors: Gao Yin , Yun Li Jun , Shi Jun Sheng , Cheng Fei Yan
Published: July 2014

To deal with the image contrast and color fidelity details problem in the traditional Center around the Retinex image enhancement algorithms, Enhancement Algorithm of Color Fog Image Based on the Adaptive Scale and Multi-parameter correction is proposed. First, the saturation component of the HSI color space is applied to the nonlinear correction. Then according to the brightness of the image pixel values, it can calculates the scale of the Gaussian kernel, and then proceeds to do the multi-parameter correction for the estimates of the reflection component, obtains the multi-scale image by the weighted average. At last, the obtained image is used to adjust the display correction, image sharpening and smoothing, and being superimposed reflection components, achieving the image enhancement. Through the subjective observation and objective evaluation, this algorithm is better than the traditional center around Retinex algorithm in treatment effect, and also saves a large amount of processing time.
The Design of Image Acquisition System Based on CMOS Image Sensor USB Interface
Authors: Hu Zhi Yu , Li Li
Published: July 2014

The system selected OmniVisiON company's CMOS chip OV7620, it is an integrated color camera chip, a 640 × 480 (300,000 pixels) image matrix. Considered that the CPLD control system is similar to the DMA mode of data transmission; Cypress's USB 2.0 chip is used by CY7C68013 chip. Finally, it is become the microcontroller firmware and device driver. The paper presents the design of Image acquisition system based on CMOS image sensor USB interface. Design an image acquisition and transmission system, and describes its firmware as well as the development of USB device drivers and PC-side application.
Hyperspectral Image Classification via Discriminative Sparse Representation with Extended LBP Texture
Authors: Ren Yue Mei , Zhang Yan Ning , Wei Wei
Published: July 2014

Hyperspectral images (HSI) have rich texture information, so combining texture information and image spectral information can improve the recognition accuracy. Sparse representation has significant success in image classification. In this paper, we propose a new discriminative sparse-based classification framework using spectral data and extended Local Binary Patterns (LBP) texture. Firstly, we propose an extended LBP coding for HSI classification. Then we formulate an optimization problem that combines the objective function of classification with the representation error by sparsity. Furthermore, we use a procedure similar to K-SVD algorithm to learn the discriminative dictionary. The experimental results show that the proposed discriminative spasity-based classification of image including the extended LBP texture outperforms the classical HSI classification algorithms.
Novel Single Image Dehazing Algorithm
Authors: Chen Jian Peng , Bi Du Yan , Liu Chang , Fan Zhun Lin
Published: July 2014

In order to improve the quality of haze degraded image, a novel method is proposed combining dark channel prior and the atmospheric degradation model. Firstly, adaptive block is performed to acquire the dark channel image; then, in HSV space, laplacian pyramid filter is required to obtain the low pass portion of V, further compensated by the single scale Retinex to achieve the final atmospheric light; moreover, for the smoothness trait of guided filter and its fast operation rate, it is suggested to gain the optimal transmission map. Experimental results show that this algorithm can effectively improve the visibility of the optical imaging system.
Synthesis of High-Strength and Water-Resistant Phosphogypsum Small Hollow Block
Authors: Xie Hong Bo , Ma Wei Bin , Ye Can Tao
Published: July 2014

The non-calcined phosphogypsum was modified and purified by quicklime, aged, treated by balling and cement coating, and then mixed with an appropriate amount of water, the cementitious material, gravel and so on. After using the vibration pressure molding process and the nature curing, the prepared high-strength and water-resistant phosphogypsum small hollow block can produce a softening coefficient of 0.82 and a compressive strength of 7.5 MPa, and the other properties meet the MU7.5 grade requirements of normal concrete small hollow block on the GB 8239-1997, which broadens the application range of phosphogypsum small hollow block, and may provide a new way to solve the comprehensive utilization of phosphogypsum.
Simulation and Application of Space-Time Coding in OFDM System in Coal Mines
Authors: Wei Jing Xin , Sun Chun
Published: July 2014

This research is conducted with the objective of improving the OFDM system in coal mines with regard to its defects and puts forward a structure diagram of STBC-OFDM transceiver for systems which require low complexity with a simulation of the system performance. Through the simulation, in which the STBC-OFDM communication system in coal mines is employed, the BER performance of the OFDM system is improved and the complexity and cost of the receiver is lowered with a significant reduction in daily maintenance.
The Luminescence Properties of Green YPO4: Tb3+,Ce3+ Phosphors for WLED
Authors: Li Jian , Dong Li Min , Li Qin , Han Zhi Dong
Published: July 2014

LED as the fourth generation light source has been extensively studied. In order to get a high-performance White Light Emitting Diode (WLED) green phosphor, YPO4:Ce3+,Tb3+ was prepared by co-precipitation. It was excited at 380nm. The structure, morphology, fluorescence property and colorimetry of the phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrophotometer. Final results show the optimal concentration ratio are 1:0.05:0.01. The crystal grain of luminescent material is 200 nm. When the bath temperature is 80°C and calcined at 1000°C for 3h, the luminescence performance of the luminescent material is excellent.
Research on Continuous Phase FM Signal Demodulation Based on STFT
Authors: Feng Yue , Fu Gang , Li Ren Long , Wang Li Ping
Published: July 2014

According to the characteristics of PCM / FM signals, we propose a new method based on STFT resolve tune software. Firstly, the spectral characteristics of PCM / FM signal is given use of the spectrum PCM / FM signal is demodulated theoretical basis. This paper discusses in detail the basic principles of this demodulation method and implementation process, analyze the demodulation performance and complexity of the method.
Performance Analysis on Three Methods for Chirp Signal Parameters Estimation Based on FRFT
Authors: Wu Yan Jun , Fu Gang , Yu Peng
Published: July 2014

Chirp signal has been used widely in radar signals, and the Fractional Fourier transform is one of the most effective tools to analyze Chirp signal. In this paper, the concept of FRFT and the estimation theory of Chirp signal are introduced firstly. Then, we study three Chirp signal detection algorithms based on character of Chirp signal energy concentrated in a certain FRFT domain. Finally, in order to test the estimation abilities of the frequency modulation rate and the central frequency of FRFT to Chirp signal, and compare the operation time of parameters estimation under different SNR of the three algorithms, we simulate performance of the Three methods, and the final simulation results show that the three method have remarkable capabilities of detecting Chirp signal with low SNR. In contrast, the two-searching method doesn’t need planar search, consumedly reducing the computation cost at the same precision.
Group Sparsity Regularization Based Compressed Sensing MR Image Reconstruction
Authors: Jin Xin , Jiang Ming Feng , Feng Jie
Published: July 2014

Exploiting the sparsity of MR signals, Compressed Sensing MR imaging (CS-MRI) is one of the most promising approaches to reconstruct a MR image with good quality from highly under-sampled k-space data. The group sparse method, which exploits additional sparse representation of the spatial group structure, can promote the overall sparsity degree, thereby leading to better reconstruction performance. In this work, an efficient superpixel/group assignment method, simple linear iterative clustering (SLIC), is incorporated to CS-MRI studies. A variable splitting strategy and classic alternating direct method is employed to solve the group sparse problem. The results indicate that the proposed method is capable of achieving significant improvements in reconstruction accuracy when compared with the state-of-the-art reconstruction methods.
Pulse Coding Soft FM Telemetry Signal Demodulation
Authors: Wu Yan Jun , Fu Gang , Cheng Gang
Published: July 2014

The traditional method of demodulation for PCM/FM telemetry demodulation threshold is higher and the computation of the larger problem, research an orthogonal baseband after rotation, Symbol Detection (Multi - Symbol Detection, MSD) technology: the first frequency under the intermediate frequency digital telemetry signals processing, single sign on orthogonal baseband signal correlation matching, and then apply compound spinning technology to meet at the same time for multiple element symbols at the same time Detection, the purpose of the final design step length synchronization method with demodulation smoothly.