bluuebunny/crossref_metadata_2025 huggingface dataset:
Acquisition Algorithm for GPS L2C Signal on Dual-Frequency Navigation Receiver
Authors: Hou Bing , Zhang Xiao Lin , Du Peng Cheng , Xu Zhu Feng
Published: February 2012

The newly broadcast GPS L2C signal will be extensively used due to its superiority. In order to acquire L2C signal fast in a dual-frequency GPS receiver, this paper firstly discusses two traditional acquisition algorithms, then proposes and implements a new algorithm based on the fixed phase relationships among C/A code, CM code and CL code and the fixed relationships of Doppler shift between the L1 channel and L2 channel. The experimental result demonstrates that the new acquisition algorithm can speed up the acquisition process substantially. It also suits other dual-frequency navigation receivers.
Information Filtering Based on Immune Mechanism
Authors: Yu Zhi Guo , Liu Feng Ming
Published: February 2012

Natural Immune System is a highly complicated, distributed, and auto-adaptive system. It has very strong ability of self-learning, memory and association, and then it can quickly eliminate the intruders and keep itself stability. Information filtering is to choose useful information with filtering strategies from information. So, the original information is going to be as antigen, and the filtering strategies and procedure be as antibody, based on the immune self-learning mechanism, we design a model of information filtering. Then, we illustrate and discuss the model performance by experimental evaluation results.
Design Principle and Error Analysis of a New Large-Range Ultrasonic Position and Orientation System Based on TDOA
Authors: Tian Ye , Sun Xiao Ying , Chen Jian
Published: February 2012

This paper designs a new ultrasonic position and orientation model, further, a kind of technical scheme that can achieve the goal of large-range position and orientation system based on the designed model is proposed. Aiming at the designed model, this paper deeply analyzes the influence of distribution structure and physical parameters of the sensors on the position range, resolution and accuracy, which will provide theory support for developing high-performance ultrasonic position and orientation systems.
SiC Particles Concentration Dependent the Properties of Electroless Ni-P-SiC Coatings
Authors: Cheng Yan Hai , Zhang Shi Ju , Peng Yu Xing , Xing Fang Fang , Li Jie , Zhu Zhen Cai
Published: February 2012

In this study, Ni-P-SiC composite coatings were prepared by adding different amount of SiC particles into electroless Ni-P plating solution. The effects of SiC particles concentration in solution on depositing rate and composition of the coatings were investigated. The different SiC contents in coatings could be obtained by adjusting the amount of SiC particle concentration in electroless plating solution. Scanning electron microscopy (SEM) results indicate that SiC particles are dispersed in the composite coating and Ni-P alloy is mainly as a bond metal envelope with SiC particles. At the same time, the microhardness became increased and the wear resistance improved with the increasing of SiC content.
Mixture and Mixture–Process Variable Experiments for Paint Preparation Applications
Authors: Hu Jian
Published: February 2012

Many experiments in research and development in the paint preparation involve mixture components. These are experiments with mixtures in which the experimental factors are the components of a mixture and the response variable depends on the relative proportion of each components, but not on the absolute amount of the mixture. Thus the mixture components cannot be varied independently. A common variation of the mixture experiment occurs when there are also one or more process factors that can be varied independently of each other and of the mixture ingredients, to bring about a mixture–process variable experiment. We discuss the design and analysis of these types of experiments, using flame-retardant coating formulation as an example. Goal of this paper is to encourage greater utilization of these techniques in paint preparation research and development.
Development of a Virtual Proving Ground for Commercial Vehicle
Authors: Chen Tao , Wei Lang
Published: February 2012

Virtual proving ground (VPG) are used effectively for commercial vehicle system development, human factor study, and other purposes by enabling to reproduce actual driving conditions in a safe and tightly controlled environment. This paper describes a virtual proving ground developed for design and evaluation of commercial vehicle and for driver-vehicle interaction study. VPG consists of a real-time vehicle simulation system, a visual and audio system, a driver handling signals acquisition system providing a realistic interface between the operator and the simulated environment, and 3D proving ground databases with areas suitable for various types of vehicle test tasks. The real-time vehicle simulation system simulates dynamic motion of realistic vehicle models in real-time. The visual system generates high fidelity driving scenes. The handling signals collection system acquires the steering, braking, accelerating, and shifting operation of driver. The pilot experiments carried out in the areas of vehicle handling and stability study are also presented to show the effectiveness of the developed VPG.
Application Research of MEMS ADXL345
Authors: Xu Cun Shan
Published: February 2012

Due to excellent characteristics of lower cost, higher reliability, smaller power consumption, less volume and lighter weight, micro electro mechanical system (MEMS) has been widely accepted and used in portable electronic devices. Based on port S3C2440, a proper method is presented to carry out the study of dynamical characteristic for tri-axial digital accelerometer ADXL345. The results could provide a well approach for improvement of this novel component.
Investigation of Passive Direct Methanol Fuel Cell (DMFC) at the Open Circuit Condition
Authors: Cao Xian Qi , Han Ji Tian , Yu Ze Ting , Chen Pei Pei
Published: February 2012

In this work, a transparent passive DMFC was constructed to investigate the transients in open circuit voltage (OCV) and the cell temperature difference, which changed as a consequence of the methanol crossover phenomenon, including anode temperature difference (ATD), cathode temperature difference (CTD) and methanol solution temperature difference (MTD). Experiments were carried out in a passive DMFC with an active membrane area of 9 cm2, at ambient temperature and pressure. Results showed that the OCV of the passive DMFC became relatively stable as the cell temperature difference rose to a relatively stable value about 30 min later. At the middle and high current densities (>2.21 mA cm-2), the performance increased continuously with increasing the waiting time, but became stable when the waiting time was longer than 30 min. The experimental results indicated that the performance of the passive DMFC could be more objectively characterized by collecting polarization data simultaneously when the cell temperature rises to a relatively stable value. Without the temperature measuring equipment, a waiting time about 30 min would be a good choice for collecting polarization data.
Transplant of Qt/E Application Based on QQ2440V3 Platform
Authors: Yao Ming , Xu Jing Zhong , Huang Lin Jian
Published: February 2012

With the development of embedded system, the implementation of application based on Qt and embedded Linux is an emphasis in researching the embedded GUI system. This paper introduces the cross compiling process and Qt/Embedded, and then describes how to develop the applications on Qt/Embedded. The methods in this paper have been validated on this developing platform(QQ2440V3)．
Weighted Combination Method of Conflict Evidence Based on Deviation
Authors: Liu Jian
Published: February 2012

To solve the problem that D-S evidence combination method may lose effectiveness when evidences are highly or full conflict, we propose weighted combination method of conflict evidence based on deviation. We think, different evidence source is under different circumstance, so the importance of each evidence is different. It is necessary to give weight to every evidence, then conflict probability can only just be assigned. Deviation is a good standard to measure errors. In the circumstance the difference between probabilities from certain evidence source and their mean is too large, that indicates confidence of the evidence is small. So we can use deviation to structure the weight coefficient of each evidence. Based on the weight coefficients, conflict evidences are combined. This method corresponds to people’s thinking habit, only little calculation is needed, and satisfying consequence can be achieved.
Research on Algorithms Performance about JSP Scheduling
Authors: Qiu Dong Wei , Wan Shan Shan
Published: February 2012

Three typical intelligent evolutionary algorithms are applied on Job Shop scheduling problem which are Quantum algorithm, Genetic Algorithm and Population Based Incremental Learning algorithm. They three algorithms have some common features in computation, encoding strategy and probability application, but with the different problems and different scale sizes of the same problem they show different performance. In this paper we take JSP as example to test their performance difference and analyze their applicability. Two benchmark Job Shop problems are used to fulfill the comparison. The results denote that Quantum algorithm is good in a great quantity of solution individual, GA is excellent in stability and PBIL had good performance in accuracy. The research also makes a reliable instruction on the application or combination of the three algorithms.
Local Boundedness for Very Weak Solutions of Leray-Lions Equation
Authors: Gu Jian Tao , Gao Chun Xia , Tong Yu Xia
Published: February 2012

The local boundedness of very weak solution of Leray-Lions equation is given in this paper by Hodge decomposition methods.
The Interaction between Quantum Dots and Plasma or Blood Studied by Capillary Electrophoresis
Authors: Hao Chun Li
Published: February 2012

Here we studied the effects of plasma and blood on quantum dots by capillary electrophoresis. The fluorescence of QDs can be observed using capillary electrophoresis even at 24 hr post-injection.
Design of Hydraulic Fault Diagnosis System Based on LabVIEW
Authors: Jin Yi , Liu Xi Xia , Liu Wei Ping
Published: February 2012

In this paper, based on the requirement of Hydraulic Fault Diagnosis, Hydraulic Fault Diagnosis system is designed. Subpanel calling Technology is used to calling sub VI to improve system running rate. Advantage of LabVIEW and MATLAB is integrated in this Fault Diagnosis software. To realizing all analysis functions, commands of Matlab is called under the Software Framework to and it is operated easily.
Effect of Casting Overheat and Rolling Temperature on Morphology of Sulfide in 30MnVS Steel
Authors: Tu Yi You , Li Guo Zhong
Published: February 2012

Effect of superheat and initial rolling temperature on the morphology and distribution of sulfide in non quenched and tempered free cutting steel 30MnVS has been studied by optical microscope and scanning electron microscope. Results show that proper superheat and initial rolling temperature can turn rod-shaped sulfide into massive or globular sulfide，to alleviate sulfide segregation and pro-eutectoid ferrite distribution along the boundary of pearlite clusters in 30MnVS , increase the intragranular ferrite content and optimize the structure of continuous casting slab.
Acoustic Imaging with Ambient Noise: Theory and Simulation
Authors: Meng Zhao Ran , Wu Ying Zi
Published: February 2012

A new kind of acoustic imaging technique was discussed in this article. The basic theory of acoustic imaging was stated and some result of simulation including the images of point source and plane wave in the imaging system was shown. The result of simulation of point source and plane wave prove that it is feasible in certain range of acoustic imaging. In high frequent band, we can get a obvious contrast between source and background and high resolution.
The Effects of MgO Addtion on the Mechanical Properties and the Phase Composition of Al2O3-TiC-TiN Ceramic Materials
Authors: Fei Yu Huan , Huang Chuan Zhen , Liu Han Lian , Zou Bin
Published: February 2012

Al2O3-TiN-TiC ceramic materials with different MgO content were fabricated by hot-pressing technique. The MgO volume percent was varied from 0vol% to 5vol%. Three point bending test was applied to get the flexural strength and the Vickers indentation was applied to get the Vickers hardness and the fracture toughness. The phase composition of the ceramics was analyzed by XRD. The effects of the content of MgO on the mechanical properties and the phase composition of Al2O3-TiN-TiC were investigated. The results shows that the addition of MgO can change the phase composition of the sintered ceramic materials which displayed with diverse solid solutions and intermetallic compounds. The convertion of the mechanical properties can also be explained by the XRD results.
Preparation and Evaluation of Antioxidative Peptide Fractions from Mytilus coruscus Protein
Authors: Ma Jia Hui , Wang Bin , Xu Yin Feng , Li Li , Qu You Le , Deng Shang Gui
Published: February 2012

Using •OH scavenging test, an efficient method had been developed to acquire protein hydrolysate (MMH) from Mytilus coruscus by an orthogonal L9(34) test. The optimal enzymolysis parameters were enzymolysis time 3 h, temperature 60°C, solid-liquid ratio 1:2 and enzyme dose 3%. Enzymolysis temperature and solid-liquid ratio showed significant effects (ANOVA p<0.05) on the hydrolysate preparation. Based on the molecular weight (MW), MMH-I (10
An Architecture of Mobile Internet Base on Cloud Computing
Authors: Liu Shu Gang
Published: February 2012

Cloud computing is a general concept in which services do not depend on the end users' physical locations or configuration of their systems that deliver the services. The purpose of cloud computing is to merge several low cost computing units to one higher level system with strong computing ability. Cloud computing for mobile devices is a very appealing and potentially lucrative trend. This paper will consider privacy and other concerns related to cloud computing. These issues could cause a barrier to widespread use of mobile cloud computing and methods for resolving these issues could accelerate its adoption.
Comparison between Finite Element Commercial Codes to Simulate High-Temperature AA5083 Bulge Forming
Authors: Giuliano Gillo
Published: February 2012

In this study in order to investigate the behavior of AA5083 aluminum sheet during high-temperature bulge forming a material model was used which accounts for the strain-rate sensitivity, the hardening and the softening of the material, the evolution of the grain growth and the phenomenon of the cavitation. The results obtained from the finite element commercial codes MSC.Marc® and ABAQUSTM were compared.
Modern Rammed Earth in Earth Architecture
Authors: Niroumand Hamed , Zain M.F.M. , Jamil Maslina
Published: February 2012

Rammed earth is a technique for building walls using the raw materials of earth, chalk, lime and gravel. Rammed earth is a structural wall system built of natural mineral soils compacted in thin layers within sturdy formwork. People have been using various forms of earth to build structures for centuries. The ancient „rammed earth‟ building technique has been used in Neolithic architecture sites and modern buildings alike. From underground green homes to other futuristic green houses. Modern architecture is a new architectural style that emerged in many countries in the decade after World War I. It was based on the “rational” use of modern materials, the principles of functionalist planning, and the rejection of historical precedent and ornament. This paper is included many examples of structures made from rammed earth using modern architecture. The result has shown the earthen buildings create safer, more people-friendly buildings. The earthen buildings are very low in embodied energy, and extremely comfortable to live in based on modern architecture.
Dynamic Extension Problems Concerning Symmetrical Mode III Crack
Authors: Lü Nian Chun , Cheng Yun Hong , Ji Jin Li
Published: February 2012

By means of the theory of complex variable functions, dynamic extension problems concerning symmetrical mode Ⅲ crack were researched. The problems considered can be very facilely translated into Riemann-Hilbert problem by the measures of self-similar functions, and the general expressions of analytical solutions of the stress, the displacement and dynamic stress intensity factor under the conditions of motive variable loads Px2/t and Pt2/x2 which were applied the surfaces of mode Ⅲ crack, respectively, were gained.
Software Modeling of Power Quality Monitoring System
Authors: Yao Ming , Xu Jing Zhong , Huang Lin Jian
Published: February 2012

This paper is mainly about power quality monitoring system analysis method, designs and implements the system based on object-oriented UML platform. Combined with UML modeling language CASE tool rational Rose, and further analysis, finally realize the power quality monitoring system.
Research in Continuous Nearest Neighbor Queries
Authors: Wang Ying Jie
Published: February 2012

This paper analyzes several methods of the present continuous nearest neighbor queries and proposes a query algorithm based on R – tree through the geometric feature of this problem, the algorithms can not only avoid the loss of dividing points and high cost of the query, but also can finish the continuous nearest neighbor query for moving objects effectively.
Sheet Metal Design with Modeling Kernels Technology
Authors: Liu Zheng , Sun Bo
Published: February 2012

Current sheet metal designing systems calculate the unfolding result automatically without the foundational information interaction with the designers, which limits the special material designing process. This paper concentrates on constructing the 3D environment for the sheet metal design, which is developed by modeling kernels technology and is favorable to construct the relationship between characteristic of material and unfolding parameters. Firstly, the developing mode is presented, by which the data structure is established. Then, the main procedure to realize the system is illustrated. The model construction is the key point. Finally, the oblique cut cylinder is unfolded as an instance to illustrate the approach. In addition, this work is the geometric foundation of the further study of sheet metal designing library.
Research on Simulation System for Power Transient Signal Analysis Based on Wavelet Theory
Authors: Wang Li Di , Wang Meng , Han Chun Cheng
Published: February 2012

For the purpose of power system transient signal analysis, recognition and classification respectively ,this paper focuses on the study of electric power transient signal acquisition, signal preprocessing method and transient signal feature extraction .Based on the wavelet theory and some simulation experiments, the process of transient signal analysis is studied. And it makes a primary development of electric power transient signal analysis automatic simulation system by the simulation software. In this research, the wavelet denoising method is used and to extract the transient signal feature, which can be used in detecting transient occurrence time. Finally, the system for transient signal analysis is developed and has the wide application fields.
Eggshell Membrane Biomaterials for Adsorption and Determination of Mn(II, VII) in Environmental Water
Authors: Zhang Rui Hua , Yang Xiao Li , Liu Jin , Cheng Xian Zhong
Published: February 2012

A simple solid phase extraction procedure for adsorption and preconcentration of manganese(II, VII) in environmental water samples has been proposed prior to inductively coupled plasma mass spectrometry. The procedure presented based on quantitative recoveries of manganese >95%. In this work, the potential use of eggshell membrane(ESM), a typical biomaterial, as solid-phase extraction (SPE) adsorbent is evaluated for analysis of trace manganese. The analytical variables, pH, flow rate, sample volume, elution, coexisting ions for optimum recoveries of manganese (II) and manganese (VII) were investigated. The preconcentration factor was 60. The detection limit (3) of manganese was 0.031 ng L-1. The relative standard deviations of determination was found to be 3.21%. The procedure was successfully applied to the adsorption and determination of manganese in environmental water samples.
Tribological Effect of DLC Coating on the Contact Surfaces in a Novel Full-Metallic Pipe Joint
Authors: Bu Nan , Ueno Naohiro
Published: February 2012

Diamond-like carbon (DLC) coatings have been used to improve friction and wear resistance performance in a variety of applications. Recently, a full-metallic pipe joint was developed for pipelines and pressure vessels. Since both pipes and gaskets can be made of AISI 316L stainless steel, this pipe joint is considered as a promising solution for hydrogen applications. It has also been pointed out that relative positions and contact conditions of the contacting parts, which are formed during assembly, have significant influence on the sealing performance. In the present study, the authors apply DLC coating on the contact surfaces in the pipe joint in order to improve the friction behavior so that a reliable sealing area can be easily achieved. Contact traces on the gaskets have been measured to evaluate tribological performance of the proposed method.
A Color Correlation and Texture-Based Shadow Elimination Method for Rainy Highway Videos
Authors: Li Han , Wu Qi Sheng
Published: February 2012

This paper presents a novel method for elimination of cast shadow and water tailing in rainy highway videos. Based on color and texture characteristics of vehicles, background, cast shadow and water tailing region, a fusion method is proposed. First, color correlation is estimated between pixels through dot product of HSI vectors. Second, the texture difference based on gradient of current region and background region is calculated. Then, these two results are fused to both eliminate cast shadow and water tailing region. Experiments show that our method is simple and efficient, also helpful to extract accurate traffic information.
The Spindle Structural Optimization Design of HTC3250µn NC Machine Tool Based on ANSYS
Authors: Xie Hua Long , Guo Hui Min , Wang Qing Bao , Liu Yong Xian
Published: February 2012

The optimization of spindle has important significance. The optimization method based on ANSYS is introduced and spindle mathematical mode of HTC3250µn NC machine tool is given. By scanning of design variables, the main optimized design variables are determined. The single objective and multi-objective optimizations are done. In the end, the main size comparison of spindle before and after optimization is given.
An Improved MMSE Pre-Coding Method for the Downlink Multi-User MIMO System
Authors: Gao Xian Kun , Cui Yan , Ying Ji Lai , Yu Yong Chang
Published: February 2012

Recently many practical downlink multi-user MIMO linear pre-coding methods have been proposed, such as the channel inversion method and the block diagonalization method (BD). Considering the channel inversion method based on MMSE criterion (MMSE-CI) which is confined to a single receives antenna case, the BD has more advantages in multiple antennas cases, however, it has poor performance at the low and medium SNR regime on account of no consideration on the noise. In this paper, an improved MMSE pre-coding method is proposed with multi receive antennas of each user. Based on MMSE-CI, the cooperation of multiple antennas is adopted to further suppress the residual interference during designing the pre-coding matrix, which could increase the signal-to- interference-plus-noise ratio (SINR) at each user’s receiver. The proposed method obtains a better performance than the MMSE-CI and the BD algorithms, and its effectiveness is validated by both theoretical analyses and numerical simulations.
Cooperative Target Allocation for UCAV Team Air-to-Ground Attack Based on Decision Graph Bayesian Optimization Algorithm
Authors: Cao Lu , Zhang An , Guo Feng Juan
Published: February 2012

In order to control and optimize cooperative air-to-ground attack decision-making of the unmanned combat aerial vehicle (UCAV) team, the principle of income maximum and loss minimum of UCAV team is built firstly. Accordingly, the mathematical model of cooperative target allocation is built based on the decision variables and constraints. Then Bayesian optimization algorithm (BOA) is introduced which is one kind of the evolution algorithm. For improving the ability of the BOA, decision graph is introduced to enhance the represent and learn of Bayesian network and compress the parameter saving. Finally decision graph Bayesian optimization algorithm (DBOA) is utilized to optimize and analyze the model. The simulation results verify that the mathematical model of cooperative target allocation can reflect the importance of cooperative decision-making, the DBOA can converge quickly to the global optimal solution and can effectively solve the cooperative target allocation problem of UCAV team air-to-ground attack.
Research on the Preparation and Rheo-Casting of A356 Al Alloy by LSPWES Process
Authors: Li Man Huan , Tang Guo Xing , Mao Wei Min , Liu Yong Feng
Published: February 2012

The semisolid slurry of A356 Al alloy was prepared by low superheat pouring and weak traveling-wave electromagnetic stirring (LSPWES), and then the slurry was further soaked for proper time and finally rheo-cast into a rheo-casting sample in this paper. The experimental results show that if the melt of A356 Al alloy is poured at 630-650°C and meanwhile stirred by weak electromagnetic field for a short time, the most primary α-Al grains solidified in the slurry are spherical and only a few are rosette-like. The shape of primary α-Al becomes more spheroidal and more homogeneous distribution in the microstructure by the process of the uniform temperature fields. The experimental results also show that the slurry temperature, injection pressure and speed have a great influence on filling ability. The higher the slurry temperature, injection pressure and speed, the higher the slurry filling ability, the more easily the die cavity is filled. With the given rheo-casting sample, if only the slurry temperature should be equal to or more than 585°C, or the injection pressure is equal to or more than 20 MPa, or the injection speed should be equal to or more than 0.24m/s, the rheo-casting sample die cavity can be filled completely. The microstructure of the castings indicates that the shape, size and numbers of the primary α-Al grains in different parts of the castings are highly consistent. After being held at 535 °C for 5 h and then aged at 160 °C for 16 h, the tensile strength, elongation rate and hardness of the rheo-casting samples with the above process are respectively 321.5 MPa, 8.03% and 105.9HB.
Production and Microstructure of In Situ Synthesized (Ti,W)C Reinforced Iron Matrix Composite
Authors: Wang Jing , Fu Si Jing , Li Yuan Hui
Published: February 2012

A powder metallurgy technique combined with in-situ synthesis technique was applied to produce (Ti,W)C particulates reinforced iron matrix composite. The sintered composites were characterized by X-ray diffraction and scanning electron microscopy. (Ti,W)C and α-Fe were detected by X-ray diffraction analysis. The scanning electron micrographs revealed the morphology and distribution of the reinforcements. The results show that the rectangular (Ti,W)C carbides are distributed uniformly in the composite. The (Ti,W)C/Fe matrix interface is found to be free from cracks and deleterious phases. The reasons for the formation of coarse (Ti,W)C particles were also discussed .
Preliminary Orbit Determination for GEO Objects Using Space-Based Optical Observations
Authors: Li Dong , Yi Dong Yun
Published: February 2012

Preliminary orbit determination for geosynchronous Earth orbit (GEO) using two short arcs of space-based optical observations plays a key role in the space-based space surveillance systems. The concept of attributable is introduced to represent the information in a short arc of observations. Using two-body integrals, the polynomial equations for distance and radial velocity between the surveillance satellite and the GEO object at two epochs are constructed. By variables transformation, multiple solutions of these equations are obtained. By covariance analysis, a penalty function is given to select the practical solutions for computing preliminary orbits. The simulation results show this algorithm can successfully obtain preliminary orbits with certain accuracy.
Effect of Sintering Temperature on Properties of NiFe2O4-Matrix Inert Anode for Aluminum Electrolysis by Adding Nanopowder
Authors: Zhang Zhi Gang , Liu Yi Han , Yao Guang Chun , Wu Di , Du Jin Jing
Published: February 2012

Conventional cold pressing-sintering technique was utilized to fabricate NiFe2O4-matrix inert anode for aluminum electrolysis by adding NiFe2O4spinel nanopowder. The effect of sintering temperature on properties of NiFe2O4-matrix ceramics was investigated especially. The results indicate that the density increases and the porosity decreases with the sintering temperature increasing, due to the higher diffusion coefficient enhanced by higher temperature. The bending strength and fracture toughness reach maximum values of 55.39MPa and 2.53MPa•m1/2respectively, when the sintering temperature is 1400°C.
The Measurement and Time Series Analysis of Loran C Ground Wave Propagation Delay
Authors: Xu Wu Nong , Liu Fen
Published: February 2012

In order to effectively correct the positioning error of Loran C to improve the positioning accuracy, it is necessary to study Loran C ground wave signal propagation delay variation with time, study the stability of propagation delay and timing characteristics. Take statistical analysis and pretreatment to Loran C ground wave signal propagation delay, test its stationarity, extraction its trend term, obtain stationary series, modeling to trend term and stationary series. The results show that Loran C ground wave signal propagation delay has good stability and repeatability, the time delay series can be fitted to combination model formed by G (2,1) cycle model and AR (p) from the regression model.
Research in Agricultural Technician Distribution Characteristics in Guangdong Province
Authors: He Bin , Wu Dong Qing , Ni Yu
Published: February 2012

Agricultural technician is the direct impetus of agricultural economy. In order to establish an evaluation and prediction model for distribution of agriculture technicians in Guangdong Province, author discuss related theory such as Moran I model and GIS technique. An applicable computing routine was presented in this paper. Based on data from yearbook of agriculture in Guangdong province, we provided some result and conclusions of talent distribution in sample regions. The result reflects the influences of agricultural technicians’ factor to the agricultural economics which may provides decision support for agricultural technicians’ policy.
The Analysis and Application of the C4.5 Algorithm in Decision Tree Technology
Authors: Zhao Hong Yan
Published: February 2012

The Decision Tree technology, which is the main technology of the Data Mining classification and forecast, is the classifying rule that infers the Decision Tree manifestation through group of out-of-orders, the non-rule examples. Based on the research background of The Decision Tree’s concept, the C4.5 Algorithm and the construction of The Decision Tree, the using of C4.5 Decision Tree Algorithm was applied to result analysis of students’ score for the purpose of improving the teaching quality.
Robust Autopilot Design for Unmanned Underwater Vehicle Based on H∞ Mixed Sensitivity
Authors: Wang Fang Rong , Kan Ru Wen , Liu Shu Nan , Dong Xu Bin , Shang Tao , Yang Song
Published: February 2012

As the complexity of marine environment and the existence of uncertain factors along with Unmanned Underwater Vehicle (UUV) dynamics itself bringing many nonlinear problems, it is difficult to control the navigation in accordance with a predetermined trajectory. Based on the UUV dynamics analysis and system modeling, this paper decoupled its control system into three sub-control systems, designed robust autopilot using H∞ mixed sensitivity control algorithm to generate the low-order controller to achieve independent control of three degrees of freedom. Eventually, the underwater navigation simulation results show that the proposed method can provide better control performance and the method is feasible and high efficiency in actual applications.
The Improvement of UMHexagonS Algorithm in AVS Video Coding
Authors: Zhang Xi Nan , Gong Yan Jun
Published: February 2012

To reduce the complexity of AVS pixel motion vector search, this paper proposes a improved AVS pixel motion estimation UMHexagonS algorithm. The algorithm adds the improve of advanced new array and adaptive adjustment search template. To the video sequence of different motion feature, compare with UMHexagonS algorithm, in the case of mean PSNR descend less than 0.01dB and bitrate only mean increase 0.54％, the time of pixel motion estimation is reduced by 8.72％～20.25％ and the calculated amount of pixel motion estimation is also reduced.
Uniqueness for Very Weak Solution to a Class of Elliptic Equations
Authors: Xu Xu Juan , Gu Jian Tao , Liu Xiao Li
Published: February 2012

This paper studies on the very weak solution to a class of elliptic equations , and acquire the uniqueness property for very weak solutions by means of the Hodge decomposition and others.
The Improve of HFPS Algorithm in AVS Video Coding
Authors: Zhang Xi Nan , Liu Ai Lin
Published: February 2012

To reduce the complexity of AVS sub-pixel motion vector search, this paper proposes a new improved algorithm based on little diamond window searching policies according to the law of the general video sequence motion vector focusing on the near of the initial searching point at the time of the subpixel motion estimation on the basis of deeping analysis to HFPS algorithm. Comparing with the sub-pixel HFPS algorithm search algorithm, the time of sub-pixel motion estimation can reduce 51.97％ on average and efficiently decrease the computational number of sub-pixel motion estimation on average PSNR lost less than 0.01dB to the video sequences with different motion characteristics.
Simulation of Fracture Behavior in the Microstructure of Ceramic Tool Materials
Authors: Zhou Ting Ting , Huang Chuan Zhen , Liu Han Lian , Wang Jun , Zou Bin , Zhu Hong Tao
Published: February 2012

In the paper, the Voronoi tessellation model is used to represent the microstructure of ceramic tool materials. And a finite element model based on cohesive element method has been developed to investigate the fracture behavior of the microstructure. The influences of mesh densities and cohesive parameters on the cracking patterns have been discussed. It is found that the enhancement of the grain boundary strength is beneficial for raising the fracture resistance of single-phase ceramic tool materials.
Virtual Impact Test for Aluminum-Alloy Wheel Based on Numerical Simulation Method
Authors: Chen Ji Gang , Zhang Guo Zhi
Published: February 2012

The mechanical properties of car wheel mast have high reliability requirements. The impact test for trial casting aluminum alloy wheel must be passed, which is one of the bench tests. Based the practical case, the integrated finite-element model for virtual test is established, including impact block, wheel, tire, bracket, rubber pad, the standard test load conditions are imposed, and the entire impact process was simulated by finite-element method, the velocity, displacement and kinetic energy curves of the impact block, the stress distribution and the impact force curve of change were obtained. Moreover, using in a typical case, compared with the physical impact test, the model and procedure of the finite-element numerical simulation was verified. The modeling method and calculation procedure given can guide the virtual design of aluminum-alloy wheel, the blindness of design can be reduced, and the development work efficiency can be increased.
Integrated Control of Suspension and Steering Systems Based on Vehicle Handling and Performance
Authors: Liu Wei , Shi Wen Ku , Fang De Guang , Guo Fu Xiang
Published: February 2012

In this paper, the features of electrical power steering (EPS) and semi-active suspension (SAS) systems have been carefully researched, and an integrated control strategy based on neural network theory was proposed to achieve the integrated control of EPS and SAS systems. In order to achieve the simulation of the integrated control strategy, a neural network controller of EPS and SAS systems was designed under MATLAB environment, and a passenger car virtual prototyping model including the EPS and SAS systems was established in vehicle dynamics simulation software SIMPACK. By ride comfort and handing stability simulation, the integrated control strategy was proved to be effective. The primary goal of this paper is to propose an effective and reliable integrated control strategy of EPS and SAS systems, and improve the ride comfort as well as handing stability of automobile.
A Variable Step Size Blind Equalization Algorithm Based on Gamma Distribution
Authors: Zhao Xiang , Sun Jin Yong , Tan Han Hong
Published: February 2012

A variable step size Constant Modulus Algorithm (CMA) based on the gamma distribution is implemented as solutions to optimize the problem of blind equalization. The factor of step size in blind equalization algorithm is varied with gamma variable, in terms of the characteristics of which, the algorithm can search for the globe optimal equalizer weight vector. Simulation results indicate that the convergence rate and the steady Mean Square Errors (MSE) performances of the algorithm proposed are much better than conventional CMA and modified CMA blind equalization algorithms.
The Design of Decision Supporting System in Oil Production Project of Oilfield
Authors: Sui Yi Yong , Yuan Qing Wang , Peng Tai Xiang , Yang Jian Lei , Ren Gui Shan
Published: February 2012

The compilation of oil production project of oilfield is a huge and complex decisions making process, which involves multi-properties, multi-objectives problems. Considering the fact that the traditionally empirical methods already couldn’t meet the requirements such as scientific, advanced, and economic, we divide the decision making problems in oil production project into two categories: predictable decision making and evaluation decision making. Based on the characteristics of these two types of problems, we design the decision supporting system in oil production project of oilfield, which use B/S model, composing by model base, method base, database, and user interface. This system made full use of the history data of oilfield, improved the value of data, and greatly enriched the decision making methods for oil production project compilation. It also made the decisions more reasonable and improved the quality of project.
The Forward Simulation of Tunnel Engineering Geological Exploration Based on Ansoft
Authors: Yao Li , Zhao Peng Fei , Zhao Hai Feng
Published: February 2012

This paper studies geology exploration problems of tunnel excavate process when geological conditions changed. The paper uses Beam test equipment based on AC induced polarization as a simulation model. Ansoft electric field simulation software is applied. It analyzes the electric field distribution of three-dimensional geological based on AC induced polarization, draws out potential diagram of the voltage distribution changing in geological conditions. When exciting field and geological conditions changed, the difference of exploration results is simulated. The geological prediction theory of Beam is better understood. Simulation results help to research the real-time detection of abnormal response characteristics and detection results of the interpretation.
Multi-Scale Hermitian Wavelet Envelope Spectrum Based Bearing Fault Detection
Authors: Li Hui
Published: February 2012

Hermitian wavelet is a low-oscillation, complex valued wavelet, which can detect the singularity characteristic of a signal precisely under strong background noise condition. A new method of bearing fault diagnosis based on multi-scale Hermitian wavelet envelope spectrum is proposed. The multi scale Hermitian wavelet envelope spectrum technique combines the advantages of Hermitian wavelet transform, envelope spectrum and three dimensions color map into one integrated technique. The bearing fault vibration signal is firstly decomposed using Hermitian continuous wavelet transform. Then the real and imaginary parts are obtained. In the end, the multi scale Hermitian wavelet envelope spectrum is obtained and the characteristics of the bearing fault can be recognized according to the multi-scale Hermitian wavelet envelope spectrum. The proposed method has been proved by vibration signals obtained from rolling bearing with inner or outer race fault. The experimental results verified the effectiveness of the proposed method.
The Combined Homotopy Methods for Optimizition under the Quasi-Normal Cone Condition
Authors: Gao Yun Feng
Published: February 2012

Non-convex programming problem is a hot problem in research field of optimization problems, since the interior point method is applied for solving programming problem. In this paper, we use the homotopy interior point method for solving a class of optimization problems by the existing theoretical results under quasi-norm cone condition. Contrary to this partial reverse convex constrained domain, we give the structure method of the quasi-norm cone condition, construct the combined homotopy method under quasi-norm cone condition and show some numerical examples
Study on Evaluation of the Airlines' Competitiveness with Applications in China
Authors: Li Xiao Jin , Si Qian , Deng Jian
Published: February 2012

This paper builds a competitiveness index system for airlines, utilize the thought way of Extenics and AHP, apply matter-element model into the competitiveness of airlines and conduct evaluation and analysis on the competitiveness level of sixteen domestic and foreign airlines which are relatively good. This approach reflects the competitive rating, advantages and disadvantages of airlines’ competitiveness within the evaluation range. Through the evaluation analysis, this paper shows that the competitiveness level of China's four major airlines is in a middle place compared with the competitive level of United States, Europe and other developed countries and needs to be further enhanced through improving management and other measures
Fluid Experimental Research on Dual-Vortex Interaction Instability
Authors: Liu Zhi Rong , Wang Jun Wei , Zhu Rui
Published: February 2012

A series of dual-vortex fulid visualization and interaction instability experiments are undertaken with PIV (Particle Image Velocimetry) system under various experimental parameters sets. The motion characteristics and the circulation-time curves of the dual-vortex are presented through PIV processing and analysis. The dual-vortex distance b=50mm, main wingtip angle α1=10° & side wingtip angle α2=8° are optimum experimental parameters for vortices dissipation, the most vortex strength is reduced by 30%-40%
Study of Trivariate Pseudoframes and Subspace Frames and their Applications in Solid-State Physics
Authors: Chen Zhong Yin , Chen Qing Jiang
Published: February 2012

Materials science is an interdisciplinary field applying the properties of matter to various areas of science and engineering.. In this work, the notion of the trivariate generalized multiresolut- ion structure (TGMS) of subspace is proposed. The characteristics of trivariate affine pseudoframes for subspaces is investigated. Construction of a GMS of Paley-Wiener subspace of is studied. The pyramid decomposition scheme is obtained based on such a TGMS and a sufficient condition for its existence is provided. A constructive method for affine frames of based on a TGMS is established.
3-D Image Reconstruction in Optical Coherence Tomography Systems Based on VTK in OCT Systems
Authors: Feng Yin Qi , Wang Kun
Published: February 2012

According to a ray casting algorithm，a method of 3-D image reconstruction in optical coherence tomography systems is presented. Volume data formed by a series of cross-sectional 2-D images are obtained experimentally in a traditional OCT system and a full-field OCT system. Using the ray casting algorithm, 3-D images have been reconstructed from these data base on VTK. The 3-D images rendering apparently reflect the corresponding details of samples
Finite Element Simulation for Micro-Hole Processing with Millisecond Laser
Authors: Wang Ke Dian , Liu Bin , Duan Wen Qiang , Wang Wen Jun
Published: February 2012

In this paper, ANSYS, a finite element analysis software is used to simulate the change of temperature field in micro-hole processing with millisecond laser, which determines the diameter and depth of the hole drilled. The relationship between processing parameters and the hole size is plotted, so as to achieve size control of a micro-hole processing. Compared with experimental results, simulation is effective for laser processing of micro-hole and can be referenced to choose the best processing parameters.
Rateless Codes Aided Multi-Hop Systems with Receiver Imperfections
Authors: Yang Jing , Zhu Chun Hua
Published: February 2012

In this paper, the rateless codes aided multi-hop systems with receiver imperfections including phase error, quadrature error, and I-Q gain mismatch is proposed. The bit error rate (BER) and the symbol error rate (SER) performance of the proposed systems over Rician fading channels are studied. Taken dual-hop transmission as a special case, the validity of the proposed system is substantiated by simulation results.
High Resolution LADAR Based on Scanning Distance-Imaging
Authors: Yu Miao , Ren Jian Hua , Hsu Dashsiung , Zhao Tong Gang
Published: February 2012

One kind of scanning distance-imaging system based on time-of-flight measurement is reported in this paper. With Nd:YAG Laser for light source, oscillating mirror for light beam scanning, SR620 for fly time measuring, the target tridimensional image is traced out through the software. This prototype has great distance-resolution as 15cm, angle-resolution as 1mrad ×1mrad, scan scale as 10×10°, and the detective range as 1km. The mathematical model of sampling, data mapping and coordinate transform are discussed, which used for system design. And the final range images are also given as follow
Novel Algorithm for Hand Vein Feature Extraction and Recognition with Biometrics Material Based on DEFD-SIFT Method
Authors: Wang Hua Bin , Tao Liang
Published: February 2012

Based on the DEFD-SIFT feature analysis, this paper presents a novel algorithm for hand vein feature extraction and recognition. First of all, the principle of the near-infrared hand vein image acquisition is introduced. Secondly, the SIFT feature analysis algorithm is used to extract the feature of hand vein. We designed a novel neighborhood descriptor, which is called “Double Ellipses Feature Descriptor”. The local texture feature is extracted effectively, while reducing the interference of skin region. Finally, the SIFT feature matching algorithm based on similarity measure is given and the experimental results demonstrate the high efficiency of the proposed algorithm in runtime and correct recognition rate.