bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Investigations to Evaluate the Mechanical Properties and Behavior of Raw and Alkali Treated King’s Crown (Calotropis Gigantea) Fiber to be Employed for Fabricating Fiber Composite
Authors: Velusamy K. , Navaneethakrishnan P. , Arungalai Vendan S. , Saravana Kumar K.
Published: July 2014

A fiber extracted from King’s crown plant belonging to apoceynaceal family is a budding component identified for potential use in composites. It is imperative to evaluate the parametric and property based features to determine its suitability. This study focuses on evaluating the properties/ behavior of raw fibers and fibers treated with various concentrations of NaOH. Considering the possible application of the fiber composites, the aptness of these fibers are examined with respect to their physical, mechanical, thermal and chemical properties. The outcome of the analysis emphasizes that the fibers treated with NaOH outperforms the raw fibers in terms of its tensile strength. Added to this, the fibers treated with NaOH have maximum cellulose and minimum wax content, thereby exhibiting their superior chemical stability. Further, the thermal analysis clearly indicates that the temperature peak shifts to a higher region in the treated fiber compared to raw fiber.
Characterization of Superconducting BSCCO/CaSiO3 and BSCCO/CaZrO3 Ag PIT Wires
Authors: Nogueira Natacha Andréia , Yonamine Anne Hitome , dos Santos Dayse Iara , Kim Jung Ho , Dou Shi Xue
Published: July 2014

The addition of two compounds, calcium silicate and calcium zirconate was tested, in the preparation of Bi: 2212 silver sheathed wires by powder-in-tube method, which were successfully tested previously in processing chips. The wires were treated in an atmosphere of O2/Ar using partial melting method. The characterizations were structural and on their electrical and magnetic properties. As the results, transition temperatures were higher than the expected for this stage, ranged from 105K (BSCCO880) to 116K (+Si883). The critical current densities encountered in transport and magnetization measurements were improved in comparison with the wires without addition.
Magnetocrystalline Properties of Sr1.4Ba1.6Co2Fe24O41
Authors: dos Santos Yvens Pereira , da Costa Andrade Bruna , Macedo Marcelo Andrade
Published: July 2014

Multiferroic Ba1.6Sr1.4Co2Fe24O41 with a Z-type hexagonal structure was obtained through the proteic sol-gel process with a single-phase, combined with thermal treatment at 1200 °C for 2 h. XRD analysis revealed the formation of a single phase, with preferential orientation in the case of a sample in pellet form. Magnetometry measurements revealed a low coercive field characteristic of Z-type hexaferrite, plus an electrical resistivity of approximately 2 × 109 Ω.cm that was considerably higher than expected.
Particle-Filled Polysilazane Coatings for Steel Protection
Authors: Neckel Jr. Lorenço , Weiss Arthur G. , Motz Günter , Hotza Dachamir , Fredel Márcio C.
Published: July 2014

Coatings of polysilazane-based ceramics are a promising technology for the protection of steels for applications at high temperatures and chemically harsh environments where, currently, special and expensive grades of steel are used for. To this work, the polymer-ceramic transformation behavior of VL-20 polysilazane precursor and 8%YSZ and glassceramic powders as fillers, and their variables were evaluated, and the coatings on stainless steel AISI 304 substrates were characterized. The first obtained coatings showed good adherence, but also high porosity.
Effects of Microwave Processing on the Properties of Nickel Oxide/Zirconia/Ceria Composites
Authors: Pinheiro Lucas Batochi , Martinelli Antonio Eduardo , Fonseca Fabio Coral
Published: July 2014

The effect of a microwave-assisted hydrothermal (MWH) treatment on the structural, thermal, and electrical properties of NiO/ZrO2:8 mol%Y2O3(YSZ)/CeO2 (60/20/20 wt.%) composite was investigated. Powders were synthesized by a hydroxide coprecipitation-impregnation technique, in which Ni and Ce oxides were coprecipitaed in a suspension containing YSZ. Simultaneous thermogravimetry and differential thermal analysis revealed that MWH treatment promotes the crystallization of coprecipitated phases. X-ray diffraction analysis was used for phase identification and the calculated lattice parameters indicated the formation of YSZ:CeO2 solid solution during sintering. Impedance spectroscopy measurements showed that the electrical properties of the composite samples were not significantly affected by the MHW.
Structure, Dielectric Relaxor Behavior and Ferroelectric Properties of Sr1-xLaxBi2Nb2-x/5O9 Ferroelectric Ceramics
Authors: Fang Pin Yang , Xi Zeng Zhe , Long Wei , Li Xiao Juan
Published: July 2014

Ferroelectric ceramics, Sr1-xLaxBi2Nb2-x/5O9 (SLBNO), were prepared using the conventional solid-state reaction method. Effect of lanthanum substitution on dielectric and ferroelectric properties of SrBi2Nb2O9 (SBN) ceramics were investigated. X-ray diffraction analyses (XRD) revealed that all the specimens had a single phase with orthorhombic space group A21am. The maximum dielectric permittivity peak broadened gradually with the increase in lanthanum substitution indicated that the phase transition from normal ferroelectrics to relaxor ferroelectrics occurred in SLBNO ceramics. The modified Curie-Weiss (CW) law was used to describe the relaxor behavior of the SLBNO ceramics. The relaxation indication coefficient (γ) was estimated from a quadratic fit of modified CW law and was found to be 1.7 and 2.0 for the SLBN20 and SLBN30 specimens, respectively. Curie temperature (Tc) of the SBN ceramic was decreased gradually with the increase in lanthanum substitution. In addition, the ferroelectric properties of the SBN ceramic were enhanced significantly by the introduction of lanthanum ions and the maximum of remnant polarization (Pr) was found to be 4.35 μC/cm2 for the SLCB20 specimen. Nature of relaxor behavior of the SLBNO ceramic is attributed to the cationic disordering at nanoscale on A site by the introduction of lanthanum ions.
Development and Test of a Small Resistive Fault Current Limiting Device Based on a SmBaCuO Ceramic
Authors: Passos Carlos Auguto Cardoso , Orlando Marcos Tadeu D'azeredo , Pinto Juliana N.O. , Abilio Vinicius Toneto , Depianti Jnaína B. , Cavichini Arthur , Machado Luiz Carlos
Published: July 2014

Since the development of Low Critical Temperature Superconducting (low-Tc) materials, various studies have been published regarding this experimental concept. Recently, researchers have focused on the design and application of high-Tc superconductor (high-Tc) materials to develop fault current limiting circuit breakers. The operation of this circuit requires large prospective/limited current ratios, especially in hazardous areas. In spite of this, several studies describing the Superconducting Fault Current Limiter (SFCL) containing members of the bismuth, mercury or yttrium family cuprate have already been described. However, none of these studies included samarium cuprates. Consequently, we have conducted a study of a small superconducting current limiter device based on SmBa2Cu3O7-d samples. The preliminary results indicated that samarium cuprates could be applied to build superconducting fault current limiter devices. In tests using a polycrystalline sample, the superconducting properties were retained without modifications to its stoichiometry. These results suggest the possibility of future investigations into SFCL devices based on these superconducting ceramics. Keywords: High-Tc, Sm-123, Device, Fault current limiter.
Dielectric Properties of CaCu3Ti4O12 Synthesized by Different Routes
Authors: Porfirio Tatiane Cristina , Muccillo Eliana Navarro Santos
Published: July 2014

The perovskite CaCu3Ti4O12, with giant electric permittivity, was prepared by a soft chemistry route and by the solid state synthesis technique. The main purpose of this work is to verify the effects of the synthesis techniques on the powder characteristics, and the microstructure and dielectric properties of the sintered materials. The synthesized nanopowders were calcined, pressed into pellets and sintered using the same procedures as for the materials prepared by the conventional method. Phase analysis was performed by X-ray diffraction, microstructure observations were carried out by scanning electron microscopy, and the dielectric properties were studied by impedance spectroscopy. The electric permittivity ranged from 11,600 to 27,000 and from 5,000 to 9,000 for specimens prepared by the conventional and the soft chemistry techniques, respectively, and the dielectric losses varied between 0.1 and 1.3 (conventional) and 0.095 and 0.3 (soft chemistry) depending on the sintering temperature.
Investigation of Photoinduced Electrical Properties in the Heterojunction TiO2/SnO2
Authors: de Oliveira Machado Diego Henrique , Floriano Emerson Aparecido , de Andrade Scalvi Luis Vicente , Saeki Margarida Juri
Published: July 2014

TiO2/SnO2 thin films heterostructures are grown by the sol-gel-dip-coating technique. It was found that the crystalline structure of TiO2 depends on the annealing temperature and the substrate type. TiO2 films deposited on glass substrate, submitted to thermal annealing until 550°C, present anatase structure, whereas films deposited on quartz substrate transform to rutile structure when thermally annealed at 1100°C. When structured as rutile, this oxide semiconductor has very close lattice parameters to those of SnO2, making easier the heterostructure assembling. Electrical properties of TiO2/SnO2 heterostructure were evaluated as function of temperature and excitation with different light sources. The temperature dependence of conductivity is dominated by a deep level with energy coincident with the second ionization level of oxygen vacancies in SnO2, suggesting the dominant role of the most external layer material (SnO2) to the electrical transport properties. The fourth harmonic of a Nd:YAG laser line (4.65eV) seems to excite the most external layer whereas a InGaN LED (2.75eV) seems to excite electrons from the ground state of a quantized interfacial channel as well as intrabandgap states of the TiO2 layer.
Flexible Linear Array with Curvature Sensor
Authors: Oliveira Timoteo F. , Matuda Marcelo Y. , Pai C. Nan , Buiochi Flavio , Adamowski Julio C.
Published: July 2014

A 1-MHz compact and flexible linear array transducer probe with a curvature sensor was developed to be shaped directly in human body curvatures. This transducer will be used for human bone imaging, in an attempt to substitute x-ray radiography. The curvature sensor, based on strain gauge construction, is embedded in the same flexible polymer matrix of the transducer. This sensor measures the curvature of the unknown surface and determinates the actual position of the emitter/receiver ceramics during scanning, in order to use the focal time-delay law. This avoids problems related to beam distortions and enhances the sensitivity of the transducer. A phantom simulating cortical human bone was used to test the transducer. As a result, images of cortical bone phantom were obtained.
Synthesis and Characterization of Nanostructured TiO2-SnO2 Composite
Authors: S. Breve Joelma C. , dos Santos Dayse I.
Published: July 2014

Nanostructured composites based on titanium dioxide have been studied in order to improve optical and photo-catalytic properties, as well as their performance in gas sensors. In this work, titanium and tin dioxides were simultaneously synthesized by the polyol method resulting in TiO2 platelet coated with SnO2 nanoparticles as was observed by scanning electron microscopy. The thermal analysis showed that the combined synthesis promotes more easily the crystallization of the TiO2 rutile phase. The composite obtained after heat treatment at 500 °C showed to be formed of almost only rutile phases of both oxides. The optical properties analyzed by UV-Vis spectroscopy showed that the combined oxides have higher absorbance, which reinforces a model found in the literature based on the flow of photo-generated electrons to the conduction band of SnO2 delaying the recombination of charges.
Ultrasonic Synthesis of SrTiO3
Authors: Andrade Raponi Olívia , Chaves André Silva , Gelfuso Maria Virgínia , Thomazini Daniel
Published: July 2014

Thermoelectric ceramics convert thermal into electrical energy, based on the Seebeck effect. In order to improve this energy conversion, the grain size of these ceramics must be in nanometric scale to reduce the thermal conductivity and electrical resistivity. Thus, nonconventional synthesis methods are being studied to produce nanoparticles, such as ultrasound synthesis technique (USS). These methods can produce powders with particles size lower than conventional synthesis, as compared to solid-state reaction (SSR), for example. In this study, strontium titanate (STO) based ceramics were synthesized by SSR and USS with 30, 40 and 50 minutes of ultrasound irradiation of 5W/ml power. The powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). There have been obtained powders of ~140nm crystallite size using USS method during 40minutes, which has proven to be the best ultrasound synthesis conditions i
Structural and Thermal Properties of YMn1-xRuxO3
Authors: Thakur Rajesh K. , Thakur Rasna , Kaurav N. , Okram G.S. , Gaur N.K.
Published: July 2014

We report the structural and thermo-power measurement of the ruthenium doped YMnO3 compounds. The room temperature XRD study shows the single phase formation of the reported compounds with the incremental unit cell volume and lattice parameters attributed to the larger ionic radius of the Ru3+ (0.68 Å) and Ru4+ (0.62 Å) as compared with that of the Mn3+ (0.65 Å) Mn4+ (0.52 Å). The observed variation of lattice parameters provides us valuable information into the better consideration of the valence state of ruthenium, in these compounds. The thermo-power measurement reveals hole-like conduction mechanism for the thermo-electric transport.
Physical Properties of Self-Polarized PZT Thin Films at Compositions around the Morphotropic Phase Boundary
Authors: Araujo Eudes B. , Lima Elton C. , Bdikin Igor K. , Kholkin Andrei L.
Published: July 2014

Physical properties of self-polarized PbZr1-xTixO3thin films with no preferential orientation were reported at 0.46 x 0.50 compositions. Structural analysis reveals coexistence between monoclinic-tetragonal and monoclinic-rhombohedral phases at 0.46 x 0.49, where the monoclinic phase is in majority over both tetragonal and rhombohedral phases. The dielectric permittivity (ε ́ = 447) shows a maximum at around x = 0.48. Asymmetries on macroscopic and local hysteresis loops confirm the self-polarization effect in the studied films.
Methods of Handling the Aliasing and Tolerance Problem for a New Unified Fault Modeling Technique in Analog-Circuit Fault Diagnosis
Authors: Gao Yuan , Yang Cheng Lin , Tian Shu Lin
Published: July 2014

Soft fault diagnosis and tolerance are two challenging problems in analog circuit fault diagnosis. This paper proposes approaches to solve these two problems. First, a complex field modeling method and its theoretical proof are presented. This fault modeling method is applicable to both hard (open or short) and soft (parametric) faults. It is also applicable to either linear or nonlinear analog circuits. Then, the parameter tolerance is taken into consideration. A frequency selection method is proposed to maximize the difference between the faults fault signature. Hence, the aliasing problem arise from tolerance can be mitigated. The effectiveness of the proposed approaches is verified by simulated results.
A Sigma-Delta Modulator System Design with 2-2 Mash Structure
Authors: Yang Yang , Sun Guo Dong , Song Ming Xin , Wang Zhi Ming
Published: July 2014

Σ-Δ modulator structure is increasingly becoming complex, it is very necessary to improve the design efficiency by the level of behavior model in the simulation. The paper discussed several important Σ-Δ modulators with ideal factors, and gives corresponding behavior model. Then, the paper shows a behavior level design with non-ideal factors. Under the condition that sample rate is 256 and input signal frequency is 250 KHz, the SNR can get 105 dB, the effective bit can get 16 bit. It can be used in audio and electronic equipment.
The Research of Noise Figure for EDFA Performance Impact
Authors: Yang Qian Ru , Shen Tao , Tan Chang Long , Zhao Qiu Yu , Zhang Xin , Zhao Li , Feng Yue
Published: July 2014

Erbium-doped fiber amplifiers is a signal light amplification of optical devices. This paper analyzes the impact of various fiber parameters on the noise figure, and characteristic of noise index has been simulated by means of OASIX software. The relationship between the pump power and noise figure, and fiber length and noise figure are obtained.
The Research and Design of the Intelligence Application Platform in Public Security E-Government
Authors: Wang Yan , Guan Shao Yun , Li Wei Hong
Published: July 2014

The paper first expounds the reason that establish intelligence application platform in public security e-government. The data of cross-regional, cross-department, cross-police process through extraction, cleaning, conversion and loading and be shared. It introduces the procedure and methods of intelligence obtaining. Finally system architecture is listed one after another according of data layer, service layer, application layer, presentation layer and security mechanism.
VEET: 3D Virtual Electrical Experimental Tool Supporting Multi-Modal User Interfaces and Platforms
Authors: Sun Bo Wen , Shen Bin , Chen Wen Wu , Zhang Yan Peng , Lin Jia Qi
Published: July 2014

This paper introduces a practical and cross-platform virtual electrical experimental tool (VEET) based on an off the shelf game engine called Unity3D which is powerful and flexible to develop Virtual and Augmented Reality (VR/AR) applications. Taking the electrical experiments of technological university as examples, the well designed virtual experimental system has the characteristics of lifelike three dimensional (3D) experimental environments, AR interactive interface on mobile devices, intelligent detecting mechanism and cross-platform. We described VEET’?s flexible design and demonstrate its use in teaching where 120 students from three classes conducted electrical experiments with it. The experiments in VEET were presented on desktop, mobile and web browser using low cost common devices (personal computer, android handheld device, Chrome browser). Evaluating the main performance parameters, the well practicability was confirmed.
A Kind of Distributed Simulation Runtime Infrastructure Based on Grid
Authors: Liu Ying , Hu Jian Wang , Cui Pei Zhang
Published: July 2014

Although high level architecture (HLA) is the mainstream of application in distributed simulation technology, poor interoperability, deficit reuse of the codes of the simulation applications and inferior expansibility of the simulation system had became the research focus of simulation community at home and broad. And Grid is able to manage a large number of heterogeneous resources of geographically and organizationally distributed. So a kind of Grid-based distribution simulation runtime infrastructure (GSRI) was put forward. Here with WSRF specification, GT4 tools was used to encapsulate the pRTI interfaces. And given the performance analysis, it is shown that despite the latency created by the transmission through wide area network (WAN), the GSRI may support the large-scare distributed simulation applications. It has a profound theoretical significance and great value of the engineering.
A Design of IT Enterprise Information Platform in Cloud Environment
Authors: Wei Ling , Zhang Wei Xi , Guo Xin Peng
Published: July 2014

This paper seeks to combine the advantages of cloud computing to design an IT enterprise alliance information platform based on cloud computing. In this study, we adopt B/S framework of tree cloud database to store IT enterprise alliance information for this platform, which is used for activity data collection and its subsequent analysis. Further, starting with the demand analysis of IT enterprise alliance information, we investigate the function of the information platform, including information release function, knowledge sharing function and online communication function and so on. At last, we propose and devise an effective IT enterprise alliance information platform utilizing the cloud resource to complete handling business problems between alliance enterprises effectively.
WIFI Network Analysis and Transplantation on Android Platform
Authors: Wang Yao , Dong Huai Guo , Wang Guang Qi
Published: July 2014

Research the Android open source WIFI network technology. WIFI is verified by the transplantation of WIFI network to achieve process. Through in-depth analysis of android WIFI related the source code of classes, analyze the WIFI framework structure and design principle. Described in detail the initialization of WIFI module、enable、Scan the access point to achieve the whole process of configuration of IP Address
Research of Intelligent Mobile Inspection System Based IT
Authors: Li Han Xi , Wang Yan Ping , Jin Zhen Xun , Qian Jie
Published: July 2014

With the development of wireless communication technology, mobile computing technology that all walks of life increasingly improve intelligence, the computer information technology are more and more been used in various fields. For Hangzhou cigarette factory, this paper is based on RFID technology, designs the wireless inspection service platform, and the system function is carried on the thorough analysis, so do the basis of dividing the corresponding subsystem and function modules, thus for the reasonable development, finally completing the design and planning of the whole system. Through wireless communication with the server for data interaction, it reduces the regional space and the limitation on the inspection work, improves the efficiency of the inspection work, and to ensure the quality of work.
A Research and Exploration of Established Public Service Network Information Platform of University-Enterprise Cooperation
Authors: Wu Juan
Published: July 2014

Practice teaching through the establishment of university-enterprise cooperation mechanism, the establishment of university-enterprise cooperation practice teaching operation mode, formulating university-enterprise cooperation practice teaching reform model, establishing higher education "university-enterprise cooperation, complement each other, “?win-win”? are to run the factors: professional practice teaching reform. So as to promote the development of colleges and universities, driving the development of enterprises to stimulate students' creativity, further developing the students' resilience. Building regional, public welfare, and participatory comprehensive embody characteristics of university-enterprise cooperation network public service platform, to explore a founded by the government, business, industry association, joint institutions, trust each other, long-term cooperation, mutual benefit and mutual university-enterprise cooperation alliance of network organization operation pattern, is conducive to integrate scattered and disorderly flow of information in the market, reduce market transaction costs and risks of cooperation, realize the government, schools, industries and enterprises linkage, depth to promote university-enterprise cooperation, improve the public service level of regional cooperation between colleges.
The Performance Evaluation of Enterprise Informatization Research Based on Dynamic Balanced Scorecard
Authors: Wei Ling , Zhang Wei Xi , Xu Wen Zhi
Published: July 2014

The performance evaluation of enterprise informatization not only can accelerate the process of enterprise informatization, but also can avoid trapping in informatization investment. In view of the existing problems in the performance evaluation of enterprise informatization, the paper seeks to combine the use of the balanced scorecard and System dynamics as Dynamic Balanced Scorecard for performance evaluation. It aims to establish a model for the combination of these long-and short-term organisational activities as a framework for evaluating the enterprise informatization performance. Example is given from a enterprise imposed informatization using Vensim software, of how core capabilities are managed to show how strategy impact on the enterprise operation. The study finds that, using the dynamic balanced scorecard method to the evaluation of enterprise informatization has good maneuverability and rationality.
The Application of Boosting Algorithm in Data Mining
Authors: Du Jin Long , Qian Yan
Published: July 2014

An algorithm which named Boosting algorithm occurred in the last ten years. It can raise the learning algorithm accuracy with multiple learning and obviously improve the efficiency of learning algorithm by adopting the principle of “comprehensive optimizing”. In addition, it can effectively develop the “weak learning algorithm” with low efficiency into a “strong learning algorithm” with high efficiency. The boosting, a new learning method to integration machine, is based in learning theory and show its good qualities in many fields. The paper elaborates and summarizes the basic ideas of Boosting algorithm and applies it into Data Mining (DM). In recent years, the DM has been extensively adopted out of labs such as in commerce, technological research and engineering technology. In this background, the paper tries improving traditional DM algorithm to solve these problems in industrial application.
Phasor Analysis Based Fault Modeling and Fault Diagnosis Methods for Linear Analog Circuits
Authors: Gao Yuan , Yang Cheng Lin , Tian Shu Lin
Published: July 2014

Soft fault diagnosis and tolerance are two challenging problems in linear analog circuit fault diagnosis. To solve these problems, a phasor analysis based fault modeling method and its theoretical proof are presented at first. Second, to form fault feature data base, the differential voltage phasor ratio (DVPR) is decomposed into real and imaginary parts. Optimal feature selection method and testability analysis method are used to determine the optimal fault feature data base. Statistical experiments prove that the proposed fault modeling method can improve the fault diagnosis robustness. Then, Multi-class support vector machine (SVM) classifiers are used for fault diagnosis. The effectiveness of the proposed approaches is verified by both simulated and experimental results.
Study of Fiber Gyroscope Fiber Defects Image Enhancement Based on Bias-Normal and Fuzzy Processing
Authors: Shan Lian Jie , Liang Ying Chun , Ge Wen Qian
Published: July 2014

Image contrast of fiber gyroscope fiber defects was low, at the same time object and background didn’t discriminate easily. Fuzzy image enhancement processing was studied and part low gray level was set zero, which leads to original image information loss using the Pal fuzzy algorithm. Combine minimum bias-normal distribution index and modified fuzzy algorithm was put forward and spacing point is counted by minimum bias-normal distribution index and then automatically affirms sub region and nonlinearity transformation was used in inverse process. This algorithm can engender different enhancement effect in different image region, which enhance contrast ratio in object and background, outstanding defect character. The algorithm was used for fiber gyroscope fiber defect infrared image processing. Experiment results show that the algorithm is effectiveness.
Detecting Human Actions by 3D Deformable Parts Models
Authors: Yang Ming , Yang Yong
Published: July 2014

In this paper, we introduce the high performance Deformable part models from object detection into human action recognition and localization and propose a unified method to detect action in video sequences. The Deformable part models have attracted intensive attention in the field of object detection. We generalize the approach from 2D still images to 3D spatiotemporal volumes. The human actions are described by 3D histograms of oriented gradients based features. Different poses are presented by mixture of models on different resolutions. The model autonomously selects the most discriminative 3D parts and learns their anchor positions related to the root. Empirical results on several video datasets prove the efficacy of our proposed method on both action recognition and localization.
Denoise PET Images Based on a Combining Method of EMD and ICA
Authors: Wei Qi , Liu Qi
Published: July 2014

The incidental component in addition to the measured target signals is considered as noise of Positron Emission Tomography (PET) images. A novel method to denoise the PET images based on Empirical Mode Decomposition (EMD) and Independent Component Analysis (ICA) associated with Sparse Code Shrinkage (SCS) technique is proposed in this paper. EMD is executed to decompose a PET image into a number of Intrinsic Mode Functions (IMFs), which are used to reconstruct a new PET image after chosen by means of an inverse EMD procedure. By applying ICA to the new PET image, an orthogonal dataset can be obtained and the signal-noise separation can be realized. Then a clearer PET image can be reconstructed by SCS. The simulation results indicate that the proposed method is effective to denoise PET images.
An Improved C-Means Clustering for Image Segmentation
Authors: Zhang Tai Fa
Published: July 2014

Image segmentation is an important part of the image process, and it is also the current hot and focus in image research. How to achieve better segmentation results are dominating targets of researchers. Currently, image segmentation based on clustering is the main research area. Firstly, this paper introduces the traditional C-means clustering algorithm and its characteristic has been analyzed. Then, the initial clustering center and the number are selected using the histogram. Finally, the image is converted from the RGB space to Lab space for clustering, and it has improved the accuracy and efficiency of image segmentation.
Stereo Matching Algorithm Based on Pyramid Double Dynamic Programming
Authors: Wei Ji Zhou , Yu Shu Chun , Dong Wen Fei , Feng Chao , Xie Bing
Published: July 2014

A stereo matching algorithm was proposed based on pyramid algorithm and dynamic programming. High and low resolution images was computed by pyramid algorithm, and then candidate control points were stroke on low-resolution image, and final control points were stroke on the high-resolution images. Finally, final control points were used in directing stereo matching based on dynamic programming. Since the striking of candidate control points on low-resolution image, the time is greatly reduced. Experiments show that the proposed method has a high matching precision.
Accurate Calibration Method for a Computer Vision System
Authors: Wei Ji Zhou , Yu Shu Chun , Wu Hong Bing , Zhang Ya Wei , Feng Yong Meng
Published: July 2014

A high-precision calibration method was proposed. This method is divided four steps: extracting calibration data, building model, calculating inside and outside parameters, and correcting camera distortion. Experimental results show that calibration is very accurate and the total error is not more than 0.06 pixels.
The Research of Programmable Equivalent Capacitor Circuit
Authors: Sheng Xia , Shang Qing Hua , Huang Zhen , Wang Bang Shao
Published: July 2014

Resistors, inductors and capacitors are indispensable components in modern electronics field. While digital potentiometer is capable of conducting digital adjustments on resistances, the flexibility of adjusting the capacitance of most capacitors is still very limited even until now. This paper introduced a digital capacitor circuit based on impedance transformations. The impedance transformation circuit was set up by assembling an integrated operational amplifier and small amounts of resistors and capacitors. The capacitance of this circuit can be adjusted by controlling the resistance of a certain resistor using a digital potentiometer. Simulation results showed this circuit has many advantages including great flexibility if controlled with a single chip, wide capacitance adjustment range, insensitivity to temperature and pressure, and the size of the circuit remaining the same while the capacitance increases.
Cryptanalysis of Elementary Cellular Automata Based Image Encryption
Authors: Zhang Tie Jun , Manhrawy I.M. , Abdo A.A. , El-Latif A.A. Abd , Rhouma R.
Published: July 2014

An image encryption based on elementary cellular automata was proposed in [Yu Xiao yang etal., International Journal of Security and Its Applications Vol.7, No.5 (2013), pp.397-406.]. In this paper, we analyze the security weaknesses of their algorithm. Based on the given analysis, it is demonstrated that the scheme under study can be broken by various attacks (Chosen Plaintext and Chosen ciphertext attacks).
A New Method of Time Domain Coherency for Radar Emitter Signal Sorting
Authors: Guo Li Rong , He Ming Hao , Yu Chun Lai , Wang Bing Qie
Published: July 2014

£o Based on judging the change of pulse amplitude of phase detecting, a new method of time domain coherency for the radar emitter sorting is proposed in this paper. We analyzed the theory of the signal coherency recognition method. Then, the mathematic derivation process and specific recognition steps of the new method are detailedly given. But above all, the new method can be applied into the signal sorting of radar emitter. Simulation results also reveal that this new method can effectively sort the radar emitter signals under the low signal-to-noise ratio, and it is a huge help to solve the problem of " leakage-batch ". Results demonstrate that the new method has strong theoretical value.
The Nonlinearities of Memoryless Power Amplifier and Model of Predistorter
Authors: Yang Huan , He Yuan Zhi
Published: July 2014

By analyzing the input and output data of memoryless power amplifier (PA), we construct the polynomial model and study the nonlinearities characteristics of it. Based on that the mathematic model of predistorter is gained, Least-square (LS) and adaptive LMS are used respectively to solve the question. Simulation results demonstrate predistortion can effectively correct the nonlinearities and both LS and LMS work well depending on different conditions.
Design of Router Supporting Multiply Routing Algorithm for NoC
Authors: Jiang Zhan Peng , Xu Rui , Dong Chang Chun , Cui Lin Hai
Published: July 2014

Network on Chip(NoC)，a new proposed solution to solve global communication problem in complex System on Chip (SoC) design，has absorbed more and more researchers to do research in this area. Due to some distinct characteristics, NoC is different from both traditional off-chip network and traditional on-chip bus，and is facing with the huge design challenge. NoC router design is one of the most important issues in NoC system. The paper present a high-performance, low-latency two-stage pipelined router architecture suitable for NoC designs and providing a solution to irregular 2Dmesh topology for NoC. The key features of the proposed Mix Router are its suitability for 2Dmesh NoC topology and its capability of suorting both full-adaptive routing and deterministic routing algorithm.
A Novel Algorithm for Multiuser Resource Allocation of OFDM
Authors: Zhao Zhong Nan , Wang Jian , Guo Hong Wei
Published: July 2014

Orthogonal Frequency Division Multiplexing is considered as the key technology of the fourth generation of mobile communication technology. In this paper, an idea is proposed which solves the issue of multiuser resource allocation for OFDM based on swarm intelligence theory, and terminal bandwidth limitation is set as constraints addition as well. Theoretically, swarm intelligence algorithm could allocate resources more efficient and simulation results show that the proposed method is able to achieve better performance and higher system data rate than other similar algorithms under the same condition.
Power Allocation Algorithm Based on QoS Strategy in Power-Line Communication
Authors: Zhou Ke , Deng Ying , He Wei , Zhang Xia
Published: July 2014

In order to maximize low power-line channel capacity within the limited transmission bandwidth, a new transmitting power allocation algorithm based on the quality of service (QoS) strategy is proposed in this paper.Orthogonal frequency-division multiplexing (OFDM) is considered to support remarkable capacity of power-line channel. In order to derive the closed form expression of the maximum channel capacity in an OFDM power communication system, the relationship between channel capacity, signal to noise ratio (SNR) and modulation scheme is analyzed.Furthermore, some influence factors of power-line channel capacity, such as branches number, branches length and end-load impendence are analyzed in this paper. Simulation result shows that the mainly factors that affect the channel capacity of low power-line are branch number and load impendence; the performance of proposed algorithm is superior to the existed water-filling algorithms at the same SNR.
Effects of Energy Harvesting Rate on Lifetime and Throughput Capacity in Wireless Sensor Networks
Authors: Zeng Yang , Zhang Xue Dan , Dong Yu Han
Published: July 2014

Energy-harvesting Wireless sensor networks have gained more and more attention in recent years. For traditional battery-powered WSNs, the effect of transmission power on the throughput capacity and the lifetime have been well studied. The throughput capacity of WSNs is defined usually as the largest common throughput that can be provided to each source-sink pair nodes. Researches showed that high transmission power increases the throughput capacity of WSNs However, the high transmission power leads to a high energy consumption, thus the tradeoffs between the capacity and the lifetime under different transmission power have been analyzed.
The Analysis on Research Progress of the Typical Hybrid Routing Protocol in Ad Hoc Networks
Authors: Wu Jing , Hou Guo Zhao , Chen Zhen Guo , Tian Li Qin
Published: July 2014

The research progress of the typical hybrid routing protocol (ZRP, Zone Routing Protocol) in ad hoc networks is analyzed, which includes the analysis on ZRP and the analysis on ZRP related research. This work can provide a reference of basic theory research of ZRP for experts and scholars. And it will get ready for the further research work in the future.
Mobile Prediction Idea Based Clustering Algorithm and Related Mathematical Quantitative Description
Authors: Wu Jing , Shao Tie Jun , Chen Zhen Guo , Cao De Sheng
Published: July 2014

Mobile prediction idea refers to predicting link expiration time with relative velocity and relative position between different nodes. In ad hoc networks, mobile prediction idea is adopted in MSWCA, and cluster stability is measured by link expiration time. MSWCA only considers on intra-cluster stability, and neglects inter-cluster stability. Aiming at the above problem, MPICA (Mobile Prediction Idea based Clustering Algorithm) was proposed. Firstly, involved concepts were given with mathematical quantitative description. Secondly, the realization process of MPICA was described. Lastly, the complexity of MPICA was analyzed. MPICA considers intra-cluster and inter-cluster stability at the same time, which is in favor of improving cluster stability and reducing cluster maintenance overheads.
Design of Coal Mine Main-Fan Automatic Monitoring System Based on ZigBee
Authors: Zhang Hong Quan , Zhang Zi Hong
Published: July 2014

The existing wired monitoring systems for coal mine main-fan has some shortcomings such as complex working environment, bad flexibility and low reliability and so on. This paper developed a main-fan automatic monitoring system based on wireless sensor network with ZigBee technology, including monitoring host, sensor node, coordinator node and several data acquisition sensor. In order to meet requirements of coal mine environment monitoring signals, CC2430 is chosen as master control chip. The system achieved functions of automatic monitoring of coal mine main-fan supported by ZigBee technology, which is stable, low power consumption, and has practical value and bright development prospect.
Chaotic Decision Model in the Collaborative Decision of Command and Control System
Authors: Xiao Yu Jie , Zhang Ding Xiong , Shi Zhang Song
Published: July 2014

In order to explore the method of collaborative decision of command and control, first of all, the relationship between chaotic decision and collaborative decision is compared, the complexity and chaos of the system of collaborative decision is discussed from the theoretical level, on this basis, chaos characteristics of decision system is described bytheorem.
Design the PCI Bus Servo Control Card Based on the PCI9052
Authors: Guo Wen Lan , Xing Hai Jiao , Dong Xiao Nan
Published: July 2014

This article designs a servo control card based on PCI9052 for the motor control of large CNC cutting machine. The design contains the hardware design of circuit and the software design of drive. The hardware design used PCI9052 to realize the communication of the host and the PCI bus, and realized the internal logic control of data communication on hardware circuit of CPLD by Verilog HDL language. Devised the hardware system principle and PCB diagram, producted circuit board by Altium Designer 6.9, and and finally debugged successly. The software driver design analyzed the relationship between Linux kernel and the device driver, proposed the servo control card design process according to the structure of Linux device driver, completed the identification and communication to servo control card by Industrial PC. The analog, switch and pulse transmission integrated on the same circuit board is different from previous, and it obtained a stable application in a number of CNC equipments.
Study of Nonlinear Observer for Dynamic Friction Compensation of High-Accuracy Servo-System
Authors: Wang Li Zhi
Published: July 2014

In this paper, a nonlinear observer is designed for a servo system with non-linear dynamic friction. With this kind of observer, the dynamic friction can be estimated and then be compensated using the input and output data on-line. A recursive formula of the nonlinear observer is derived by using the block pulse function which can be easily implemented on-line with microcomputers. The designed non-linear observer is applied to high accuracy servo system running at very low speed and prove to be effective and satisfactory.
The Application of Medical Robotics in the MRI-Guided Invention
Authors: Guo Wen Lan , Huang Zhi Jia , Zhang Yun
Published: July 2014

This proposal focuses on the interventional MRI technology and the MRI compatible robots which are used to overcome some limitation of the MRI. In the introduction part, the development and the limitation of the current MRI interventions are introduced and a possible solution, MRI compatible robotic assistance, is proposed. In the design part, the specification of the MRI robot is discussed, including the MRI compatible material, the motor and encoder, the control unit and the combination of haptic sensor. Finally, the possible future application of the MRI compatible interventional robots is introduced.
Database Design of NC Cutting Tool Matching and Management System
Authors: Sui Xiu Lin , Wang Di , Liu Xin Yang , Teng Yan
Published: July 2014

In order to improve efficiency of the cutting tool in the practical production process and mend the phenomenon of disjunction between previous NC cutting tool matching and cutting tool management, integrate matching with management of cutting tool and regard Access as the backstage database and apply VC++6.0 software to develop database management systems of cutting tool matching and management. The production process of cutting tool efficient matching and the management process of cutting tool information is studied, according to the application requirements of system, then the function target of the system realization is established, the overall structure model of the system is constructed and the function and operation procedure of each functional module is designed.
Research on PCB Rogowski Current Transformer Based on AD7742
Authors: Wei Xin Lao , Zhu Bo , Pang Bing , Liu Tong , Wang Song , Li Rui Hai
Published: July 2014

Rogowski coils is a kind of special structure hollow coils, it has good linearity, no iron core, no magnetic saturation phenomenon and wide measuring range, which has been used to measure all kinds of various changes current. The current transformer consist of PCB Rogowski coil and digital integrator has been designed, includes the structure of PCB Rogowski coils and the principle digital integrator based on AD7742. The test of PCB current transformer show that it has high accuracy and PCB coils has good linearity. It can meet the requirement of current measurement.
Research on a Liquid Color Detecting Device
Authors: Zhou Zhen , Li Di Xing , Qin Yong , Liu Li Feng
Published: July 2014

At present, the error rate of color detecting device is generally between 1%-5%, and mainly for the solids. To improve the detection accuracy further, and adapt liquid color detection, this research uses a new method to build light paths, and combines the United States TAOS's TCS3200 color sensor and STM32 microcontroller. A new type of liquid color detecting device is designed, system structure and testing process of the device are also given. This device has more than 10-bit A/D conversion accuracy, 0.5% or less error rate, and less than 30% of the price of similar products. It has broad promotion and application prospects, and can be widely used in chemistry, biology, grain and other fields.
The Modeling of OTFT and the Measuring of Small Signal Detection Circuit
Authors: Liu Xin Cheng , Zhu Min , Jing Zhi Hui
Published: July 2014

In order to detect OTFT small signal dynamic characteristics of weak current, we designed the detection circuit. The current detection range of the circuit is 10-9～10-6A, circuit bandwidth reaches 10kHz.According to the data tested by copper pthalocyanine thin organic static induction transistor we prepared, an equivalent circuit for simulating its dynamic performances was built and the factors influencing the performance of the device was investigated. The simulation results and actual test results are basically identical,which show the reliability of organic thin film transistor equivalent circuit model. In addition, through analyzing the model structure and the simulation results, the grid schottky junction capacitance and the device current intensity are the important factors in determining the dynamic properties of organic thin film transistor.
A Synchronous Sampling System of On-Line Monitoring for Long-Distance Cable Insulation Based on DSP and GPS
Authors: Wei Xin Lao , Zhu Bo , Pang Bing , Liu Tong , Wang Song , Li Rui Hai
Published: July 2014

The induced voltage of the long-distance power cable will reach high value, so the metallic sheath of cable should be cross-linked to reduce the induced voltage. It is safe and economic enough but bring out problem of monitoring the situation of insulation. In order to solve the problem, a new method is provied and a monitoring system based on Digital Siganl Processor and Global Positioning System are designed. The composition of system has been introduced, includes the hardware and software design. The results show that the monitoring system can reflect the situation of cable insulation, and the mothod is proved to be validity and feasibility.
Design of Wireless Sensor Network for Fire Detection
Authors: Du Ning , Liu Zhi Long , Dong Huai Guo
Published: July 2014

The prevention and detection of fire have been hotly researched in worldwide. In this paper, an elaborate method of wireless sensor network for building fire safety is proposed. ZigBee technology is adopted in the wireless sensor system to help saving the energy cost and reducing energy consumption. In the routing selection, we choose MESH topology in wireless sensor networks in order to enlarge the monitoring scope. Each end module consists of a microcontroller on Arduino Due board and an Xbee Pro S2 wireless communication module based on the Zigbee standards. Sensors are used for detection which makes it possible to detect fire before inflammation.