bluuebunny/crossref_metadata_2025 huggingface dataset:
The Biocompatibility of Ti Alloy Improved by Nitrogen-Doped Diamond-Like Carbon Films
Authors: Baheti Wufanbieke , Li Ming Xin , Wang Fu Guo , Song Jin Ge , Xu Long Hua , Liu Bin
Published: January 2015

The nitrogen-doped diamond-like carbon film was prepared on Ti6Al4V alloy by using plasma enhanced chemical vapor deposition (PECVD) technique,and its biocompatibility was studied.The surface morphology,chemical composition and contact angle were measured by scanning electron microscope (SEM),X-ray photoelectron spectroscopy(XPS),Raman Spectrometer and contact angle measuring device. Finally, the proliferation rate and cellular morphology of 3T3-E1 osteoblast cells on different sample surfaces were tested and Image J software was used to statistically analyze the count of the adhered cells. The results showed that cell adhesion and proliferation were significantly (P<0.05) increased on nitrogen-doped diamond-like carbon films , which illustrated that N doping improved the biocompatibility of DLC films. This finding has potential clinical application value to modify titanium alloy for new bone formation.
Application of ActiveX Technique in Disaster Tolerant System
Authors: Luo Min , Liu Bang Tao , Li Yuan Bin , Li Min Jun , Deng Huan
Published: January 2015

The paper introduces a disaster tolerant system based on B/S mode and proposes a safe and effective communication protocol that combines with communicational needs. The protocol has been realized in this paper. This system has adopted remote management based on Web so that its construction is reasonable and operation is convenient. Through test,the system which is excellent in performance and stable in working is considered to be valuable for application and promotion.
An Improved Image Compression Algorithm Based on Block and Classification Scheme
Authors: Wu Chun Ming , Su Lang Fang , Yang Tao
Published: January 2015

To improve compression performance, and realize the automatic selection of compression algorithms in processing images without the prior information, the regularity relationship between compression algorithms and image features is studied, and a preprocessing scheme of block and classification based on image features has been proposed in this paper. Compression algorithms pre and post preprocessing scheme are investigated for the same 100 images. Our scheme achieves the larger peak signal to noise ratio (PSNR), which demonstrates the effectiveness of the proposed preprocessing scheme of block and classification in improving compression performance and selecting suitable algorithm to process image without the prior information.
Fuzzy Comprehensive Evaluation Model of Computer Network Security and its Application
Authors: Huang Yan , E Jia Qiang , Tao Chen , Wang Zhi Qiang
Published: January 2015

Network security assessment is a complex multi-criteria problem including both quantitative and qualitative factors. In this paper, taken the computer network security evaluation index for a research object, the judgment matrix of index weight was improved based on the fuzzy theory, and a new weight determination approach was proposed to make up the shortcomings of traditional weight determination method and highlight the fuzziness of expert judgment. Meanwhile using fuzzy theory to establish fuzzy evaluation matrix, then combine analytic hierarchy process to set up a fuzzy AHP evaluation model of the computer network security. At the final stage, a security assessment of the system of an institution’s network was to implement to demonstrate the feasibility of the evaluation model.
Elements of Pneumatic Transport
Authors: Rajczyk Jarosław , Helbrych Paweł
Published: January 2015

The article presents the issues of components for pneumatic transport. Discusses the physical characteristics of the pneumatic transport, changes in the value of pressure , density and velocity of the air. The principles of operation and construction of the suction conveyors. Discusses and proposes new solutions for suction nozzles with extended functionality. discusses the most frequently emerging issues of the pneumatic transport. Indicates the directions of the development of air transport.
Design of a Compact Dual Band-Notched Ultra-Wideband Diversity Antenna for MIMO Applications
Authors: Song Bao Jun , Zhao Hui , Xu Tong , Zhang Qin
Published: January 2015

A compact dual band-notched ultra-wideband (UWB) diversity antenna for multiple-input-multiple-output (MIMO) application is presented in this letter. The antenna consists of two tapered microstrip feeding lines and two semi-circle patches as the radiators. The C-band and wireless local area network (WLAN) for IEEE 802.11a band-notched function is achieved by etching four split-ring resonators (SRR) in the patches. The simulated and measured results show that the proposed antenna has a broadband impedance bandwidth covering the UWB band with definition of |S11|<-10dB and a dual band-notched function at C-band and WLAN band. As a multiple-input antenna, a good isolation |S21| between two ports better than -15 dB across the UWB is also achieved. The radiation patterns, peak gain, and envelope correlation coefficient are also measured and discussed.
Design of Four-Rotor Unmanned Aircraft Control System Based on ARM
Authors: Lv Chang Zhi , Hao Yun Can , Fan Di , Wan Lu
Published: January 2015

As a new type of vertical take-off and landing unmanned aerial vehicles, four-rotor unmanned aircraft has strong load capacity, simple structure, flexible operation Characteristics, so it is the preferred method of execution the air, and is widely used in military and civil field. Based on four-rotor aircraft structure and movement theory, this paper designs the aircaft control system based on ARM. Based on upper machine, the design of PID control algorithm was tested in this paper. From the results, the stability of the controller is good, and its speed control is superior to the single closed-loop.
Study on the Measuring and Positioning of the Rim Valve Hole Based on Machine Vision
Authors: Wang Fang , Ma Chao Kun , Dai Shan Qiang , Li Chang Chun
Published: January 2015

The author has designed a visual workbench to realize that the rim can rotate with the workbench. Meanwhile, the linear CCD camera records the rim’s circumference. The paper has explored the measurement method of getting the rim valve hole position using machine vision. The system can calculate the position of rim-hole and control the servo motor by image processing, characteristic recognizing and measuring to locate the position of wheel-hole automatically. And the paper has verified the accuracy of the method by experiments.
Engineering Science: Developmental History, Definition and Roles
Authors: Qiu Yong , Wei Fa Yuan , Li Jia , Jiang Rui Song
Published: January 2015

Engineering science is bridge of fundamental science and engineering. This paper introduces origin, growth and figuration of engineering science by examining its history, and defines it as science-based engineering theory, or science-abstracted engineering theory by comparing concepts related. Finally, roles, which engineering science play for a nation, are discussed including increasing productivity, providing solutions for national security, and advancing science and technology. The authors suggest more recognition of fundamental science, talent cultivation from Chinese perspective.
Experimental and Numerical Research on Voids and Cracks with Geological Radar Method
Authors: Zhou Chang , Liang Guo Qing , Li Hong Mei
Published: January 2015

In order to acquaint the application of geological penetrating radar (GPR) in tunnel lining detection elaborately, the tunnel lining model involving diseases (voids, voids filled with water, zone filled with materials and cracks) has been researched with GPR (equipped with a 800MHz antenna). And on the basis of the finite difference time domain method (FDTD), the 2-D simulation model of tunnel lining with different diseases was established with the software GPRMAX2D for further research in 800MHz and 1400MHz antennae. Comparing the GPR images of the test model and the 2-D numerical model with the actual layout settings in the tunnel lining, the following results can be obtained obviously. GPR is impressible to steel, while the lower rebar is difficult to identify for the double-layer rebar; GPR equipped with a 800MHz antenna is appropriate to monitor the void, while the accuracy of the geological radar method is related to the shape, size, depth and water condition of the voids; the accuracy of GPR is almost 50mm for the 800MHz antenna , while it is 20mm for the 1400MHz antenna and cracks can’t be identify with the 800MHz.
Influence of Rectangular Holes on Stability of Three-Layer Plates
Authors: Kipiani Gela , Rajczyk Marlena , Lausova Lenka
Published: January 2015

Grounded on the theory of thin shells and with application of generalized functions elements is solved the problem on critical compressive loading definition of three-layered rectangular plate with limited length through cut. The method of consideration of single limited length cut in parallel of one of rectangular sides in plane is spread on consideration of rectangular hole as four cuts should create the closed rectangular contour, and therefore, are simulating the hole. Due the various selections of approximation functions is proposed to also consider various types of boundary conditions.
Study of the Effects of Karst Area Beneath the Tunnel on the Stability of Surrounding Rock
Authors: Dong Li Wei , Cao Ping , Liu Jie
Published: January 2015

Geotechnical engineering in large scale is endangered by the karst areas which are close to the engineering. The stability of the tunnels is greatly affected by the sizes and locations of the karst caves. Based on a engineering example, a study of the effects of karst area beneath the tunnel on the stability of surrounding rock is conducted. It can be concluded that the displacement release of surrounding rocks and the distribution of the vertical stress in surrounding rocks are greatly affected by the sizes of the karst caves and the distance between the tunnel floor and the karst cave.
Experimental Study of Effects of Joint on Rock Fragmentation Mechanism by TBM Cutters
Authors: Li Kai Hui , Cao Ping , Liu Jie
Published: January 2015

To study the effect of rock joint parameters, the joint orientation, the filling situation of joint and the distance between the center of joint and the position of penetration on rock fragmentation mechanism by tunnel boring machines (TBM) cutters, a series of penetration tests were conducted on rock-like specimens using the modified triaxial testing machine. Data of indentation load and penetration depth during the loading process were recorded and analyzed. Results show that the filling situation of joint can significantly influence the resistance of rock to penetration. The joint interface closer to the position of penetration plays a more positive role in rock fragmentation than that farther to the position of penetration. The joint orientation can greatly affect the peak indentation load, the anti-invasive factor, the crushing work as well as modes of rock fragmentation. With the increase of joint orientation, the peak indentation load, anti-invasive factor and crushing work decrease firstly, and then increase. When joint orientation equals to 60° and 90°, they reach the minimum and maximum values, respectively.
Influence of Waterproofing Agent on Foamed Thermal Insulation Materials and its Mechanism Inquiry
Authors: Li Jing , Li Guo Zhong
Published: January 2015

Lightweight aggregates glazed hollow bead, cement, foaming agent, foam stabilizer and waterproofing agents as the main raw material, produce foamed thermal insulation materials by vibration shaping. By adding emulsified stearic acid and methyl stearate alcohol organosilicon waterproofing agent, the effects of two types of waterproofing agent on quality of water absorption of foamed thermal insulation materials were studied, and the related mechanisms were discussed. Results show that the waterproofing effect of organosilicon waterproofing agents is superior to emulsified stearic acid, when the content of emulsified stearic acid and organosilicon waterproofing agent are 7% and 4% respectively, 2h,24h water absorption rate of samples are 18.34%, 45.45% and 14.45%, 32.83%.
Discrete Element Simulation of Coal Cutting
Authors: Ji Yu Jie , Xu Bao Xin , Sun Yu Jing
Published: January 2015

In order to study coal cutting mechanism, particle discrete element theory is adopted to establish numerical modeling of coal cutting processes. The paper presents a brief overview of the constitutive model and calibration of the discrete element model by simulation of the Uniaxial test and Brazilian tests and analyze the movement of picks. The results show that coal effect mainly by internal tension and shear forces, which tension large value, accounted for the major role in the destruction of the coal. Cutting force and Normal force influence on pick largely, Lateral force is small influence on pick.
The Solution and Parameter Analysis of the Single Pile Response Subject to Lateral Load Based on Three-Parameter Subgrade Resisting Force Model
Authors: Fu Qian , Huang Jia Hao , Liang Shu Ting , Sun Xiao Qing
Published: January 2015

To further investigate the mechanism of the interaction between the response of single pile and pile-soil on the condition of lateral load, on the basis of the normal type of the coefficient of subgrade reaction, this paper reaches the transfer matrix solution of single pile subject to lateral load by combining matrix transfer method with finite element method assuming that the coefficient of subgrade reaction is constant in each finite element. With the matrix solutions obtained, a computer program is developed using MATLAB to compute the pile responses and parametric studies are carried out on the effect of the constraint conditions of pile head and tip, effect of soil properties etc. and the results are discussed in detail.
The Finite Element Simulation Analysis of Urban Subway Shield Tunnel
Authors: Zhu Feng Qi , Liu Huan Qin , Zhang Jian
Published: January 2015

Shield tunning method has been used widely in urban underground engineering. Based on a certain range of Wuhan subway shield tunnel, the subway shield tunnel segment of the internal force and deformation were studied by the load structure method and stratum structure method. Influence of the formation parameters and the parameters of the lining structure on the segment internal force and deformation was analyzed. And the tunnel construction was modeled by three-dimensional dynamic finite element method. The influence of the construction process about ground subsidence and segment stress was discussed, in order to guide urban subway tunnel construction design.
Numerical Analysis on Square CFT Stub Columns with Binding Bars under Cyclic Loading Based on OpenSEES
Authors: Wang Ying Tao , Cai Jian , Zheng Bo Zhen , Long Yue Ling
Published: January 2015

In order to study the seismic behavior of square concrete-filled steel tubular (CFT) columns with binding bars under cyclic lateral load, numerical simulation is carried out based on the finite element software OpenSEES. The influence factors of seismic performance on square CFT columns with binding bars were studied. The results indicate that the analysis results exhibit good agreement with the experiment data. The axial load level is the main factor that influences the envelope curve. The stiffness decreases with the incresing of axial load level, while the ultimate lateral load increases with the axial load level less than 0.2, and decreases with the axial load level more than 0.3. The thickness of steel tube has a significant influence on the ultimate lateral load, while has little impact on the shape of envelope curve.
Topology Optimization Design of Spacecraft Antenna Pedestal Structure under Random Excitations
Authors: Liu Hu , Zhu Ji Hong , Zhang Wei Hong
Published: January 2015

The purpose of this paper is to demonstrate a topology optimization design of the spacecraft antenna pedestal structure to save the structural weight as well as maintain the dynamic performances. The dynamic responses under random acceleration excitations are analyzed firstly and then the peaks of acceleration response are equaled to be static inertial load in the topology optimization as an expedient method. The pseudo-density based topology optimization model considering stress under inertial load as constraint is then formulated, and then further detailed design of the pedestal is carried out according to the optimized structural topology. Compared with the initial design, the optimized structure is improved with the total weight saved and both the dynamic responses and static stress satisfied.
Design and Research of Tower Foundation in Sandy Slope Terrain
Authors: Qin Li , Shi Nan , Zhang Pei Jie
Published: January 2015

This article relies on 66kV transmission line new construction design of Chifeng JingHua in the Inner Mongolian area, this paper discusses about the program of tower foundation in sandy slope terrain. Based on the original design method of steps foundation design, this paper provides a set of feasible design method, at the same time, by comparing with the design of the bored pile foundation, draw pile is more suitable for this project conclusion.
Basement Stretch and Ground Fissures Formation in Linfen Basin
Authors: Zang Ming Dong , Xu Ji Wei , Deng Ya Hong , He Jia , Qiao Jian Wei , Liu Yi
Published: January 2015

The Linfen Basin can be the most developed area of ground fissures and the associated geo-hazard in China and even in the world. Taking the Linfen Basin as the prototype, a numerical analysis with finite element method is made to study the stress and strain response characteristics of superficial ground and multistage fracture system subjected to the action of basement stretching. The germination relationship between deep structure activities and ground fissures development is revealed. Results show that the basement stretching can cause the tensile deformation of superficial ground. When this kind of action is coupled with normal dip-slipping tension of faults, it can inevitably form or aggravate the tension-shear fracturing, and establish the tectonic foundation for the development of ground fissures.
The Solar Cell Mathematical Model Simulation and Verification
Authors: Zhang Rui Lan , Li Shu Guang , Zheng Hong Xia , Zhou Jun
Published: January 2015

The output characteristics of solar cell that researched as the target is analysed at different temperatures and light intensity .Combining with the equivalent circuit of solar cell, mathematical model is established .The system is simulated through MATLAB/Simulink and the data is compared with the actual one. The experimental results show that the model can well reproduce the output characteristics curve of solar cell at arbitrary condition and the error between the model and the actual output is decreased because of the series resistance. The system can satisfy the requirements of engineering design, in addition, the system can provides theoretical basis for simulation study of solar power generation system.
3D Model of the Picks Configuration on the Cutting Head Based on Phyllotaxis Theory
Authors: Ji Yu Jie , Wan Ming
Published: January 2015

In the millions of years plants continue to develop and evolve for the competition of survice, the macroscopic and microscopic structure and morphology of plants may seem simple, but its specific functions, is man-made design unmatched. By observing the distribution of plant leaves, bionic design of the picks on cutting head based on phyllotaxis theory and establish its 3D model ,which fills its gap in the field of bionic design.
Honeycomb Structure Design Based on Finite Element Method
Authors: Wang Bin , An Peng , Jiang Huan , Zhang Zi Lei , Zhang Da Qian
Published: January 2015

The element model of a honeycomb structure is established by using ANSYS software. Then theinfluence of design parameters such as inscribed circle diameter and thicknessof honeycomb on the strength and stiffness of honeycomb structure is explored.Under a given external load condition, the honeycomb structure which satisfies the equivalent stress criteria is got by changing inscribed circle diameter,wall thickness and skin thickness of a standard structure respectively. Comparethe weight of honeycomb structure get from these three methods and generalize a method of honeycomb structure lightweight design which satisfies different requirements.
Research on the Effect of Temperature to the Characteristic of Overhead Transmission Lines
Authors: Qu Cheng Zhong , Xu Zhi Bo , Lu Ling
Published: January 2015

With the economic development,the transport capacity of the existing transmission lines can not satisfy the demand for electricity. When the line needs expansion we propose to replace the new optional wire to reach the goal line expansion without changing the existing transmission line structures premise of the original line. We should consider energy conservation, temperature, security when running on N-1 and sag expansion to the main line. To satisfy these requirements, we set up the principle of development for the proper ties of the conductors to be developed and made assessment on the newly –developed conductors in China and foreign countries in recent years.
Finite Element Analysis of a Containment Vessel Structures Based on the Multi-Layer Shell Elements
Authors: Zhang You Jia
Published: January 2015

In order to research the prestressed concrete containment structure under Strong Earthquake, the multi-layer shell elements has been used to set up 3-d finite element model , time history and the static nonlinear analysis is carried out on the structure. Nonlinear finite element of a 1/10-scale PCCV model was analyzed and the dynamic characteristics of the model, the initial stiffness, the maximum base shear and the maximal displacement on the top of the cylinder had been calculated. Research show when ground motion reached 3g, tensile stress of concrete on wall and equipment at the bottom of the valve hole have exceeded 4MPa, but tensile stress of concrete on dome have less than 0.5MPa. The finite model calculated results are in good agreement with the results of previous papers of Pseudo dynamic test. It is concluded that this containment vessel has sufficient aseismic safety. It can provide a reference for seismic design.
An Indoor Air Quality Manager Based on the Smart Mini-Car
Authors: Luo Heng , Gao Lu , Ye Xiao Yan , Jing Tong , Wang Ning , Jin Ning Jie , Yue Xin
Published: January 2015

Indoor air quality has become a major concern in the past three decades due to the air-tight structure design and usage of synthetic building materials. A number of measures have been presented in order to improve the indoor air conditions via ventilation and air conditioning systems. We distinguished ourselves by adopting a self-managed plant based method in which a mini-car is used to carry vegetation to places where air conditions are poor.
Force Acquisition for Impact Tester
Authors: Han Guo Hui , Shi Tie Lin
Published: January 2015

A force acquisition system for digital impact tester was investigated, in which structural design of bar-shaped elastic element, circuit design as well as static analysis were involved. Based on analysis of international requirements on the detection precision of digital impact tester, information concerning the precision of sensor parameters, sensors and adhesive was collected, and adhesion sites were settled through finite element analysis and optimization. Circuit design involved zero setting, temperature compensation, amplifying circuit, filter circuit and circuits to connect host computer. Loading calibration test was performed on sensors under static working condition. According to partial authoritative examination, the linearity was 0.06%, the repetitiveness was 0.01%, the retardation was 0.08%, and the sensitivity was 1.112. According to the examination conducted in some metrology institute, the total work error of impact in a digital impact tester adopting the above force acquisition system was 2% of the impact value of a standard specimen, which has already reached the precision level and met the design requirement..
Development of Portable NIR Spectrum Acquisition and Analysis Software
Authors: Liu Cui Ling , Dou Sen Lei , Hu Yu Jun
Published: January 2015

NIR spectrum is established as an independent analysis technology and applied in more fields. The demand of portable and fast analysis is impeding. Using JDSU’s MicroNIR1700 NIR spectrum engine as the hardware platform, we contrived the NIR spectrum acquisition and analysis system. The spectrum data is output from the engine through USB port. We develop the software on computer by C# language. The software has the function of spectrum acquisition, pretreatment, modeling and prediction, the result is displayed by graphs and tables. This system is tested successfully by using flour sample which lays the foundation for promoting the portable NIR acquisition and analysis system.
A New Imaging Method for Circular Trace Scanning SAR with Wide Observation
Authors: Jiang Huai , Han Min , Zhao Hui Chang
Published: January 2015

Circular Trace Scanning SAR is a new strip map mode SAR imaging in recent years, its imaging speed is fast with larger scene. This paper first establishes the imaging geometry right, by the four order approximation of the oblique distance model, combined with the series inversion method, and the removal of the coupling terms in the spectrum in the range Doppler domain, finally complete the azimuth compression. The simulation results prove the validity and feasibility of the imaging.
Optimal Design of Sensitive Structure in Gas Pendulum Tilt Sensor
Authors: Zheng Yong Hong , Peng Shi Liu , Wang Hong Wei
Published: January 2015

Optimal design of sensitive structure in gas pendulum tilt sensor was discussed. Using ANSYS software, fluid fields produced by heat source of the sensor in center were simulated. According simulated temperature field which is the key sensitive factor of the tilt sensor, optimal design of sensitive structure was discussed further. The results show that sensitivity of sensor is better when the distance between sensor wire and heat source is 0.2 R or 0.3R (R is radius of chamber). In respect to vertical place, experiment and theory show sensor has better sensitivity and linearity when installing angle is 60 ̊ while the horizontal distance between sensor wire and heat source is 0.3R.
Study on the Design Method of Ocean Bottom Seismometer Based on Field Source Characteristics and Coupling Theory
Authors: Cui Pei , Wu Yun Chao
Published: January 2015

Ocean bottom seismometers (OBS) are deployed at the interface of seawater and submarine medium for receiving the ship seismic wave signal. However, it’s difficult to extract the ship seismic wave information because of the complexity of seismic wave field source. In addition, the movement of the sea and coupling response can also lead to the same problem in the concerned frequency band. How to eliminate or reduce the external interference must be considered in the development of ocean bottom seismograph. This paper gives the basic principle of the sensor selection and structure design through the study of source characteristics and coupling theory. The improved ocean bottom seismometer can be matched with ship seismic wave signal and increase the detection distance.
Temperature and Humidity Measuring System Based on ZigBee and GPRS
Authors: Gong Mao Fa , Yin Fan Jiao , Gu Qiang , Song Bao Ye , Yu Yong Jin
Published: January 2015

It is important for modern agricultural production to measure temperature and humidity in a real time way. This paper combined the short-distance wireless communication technology ZigBee with the long-distance wireless communication technology GPRS to design a solar-powered temperature and humidity measuring system. The system is easy to install and can run in low cost, so it is especially suitable for small and medium agricultural producers.
Research on Miniature Bio-Mimetic Robot Detection System for Gastrointestinal Tract and Motion Compatibility
Authors: Zhang Chun Fen , Chen Hong Wei , Wang Bao Yong , Fan Yom Zong
Published: January 2015

Gastrointestinal micro-bionic robot checkups system in clinical applications has very broad prospects and important significance, which has become one of the hot research fields of medical equipment at home and abroad. In this paper, based on the micro machining technology, micro actuation technology, microelectronics technology, wireless communication technology, wireless power transfer technology and clinical medical technology, this study focused on the system design and the locomotion compatibility of a miniature biomimetic robotic examination system for gastrointestinal tract. The aim is to provide a new effective approach and reference for the design of robotic endoscope system. The result shows that the miniature bionic creeping robotic system runs stably and has good move performance. This generation of miniature bionic creeping robotic system is very important for the further research. Development of the gastrointestinal tract considers running checkups micro-robots its efficacy and safety analysis of the compatibility of that robot and the human gastrointestinal tract.
Fractional Extraction and Structural Characterization of Coconut Shell Hemicellulose
Authors: Zhao Feng Hui , Chen Yong , Chen Run Liu , Liu Min , Guo Yu Qiang , Fu Gui Lin
Published: January 2015

Three principal components (cellulose, lignin, and hemicellulose) of coconut shell (CS), an abundant tropical biomass, were quantified using the Van Soest method. It was observed that CS had a high content of hemicellulose (30% of the raw CS material). The present study was undertaken to investigate the extractability of hemicellulose from CS obtained by ultrasound-assisted potassium hydroxide solution with the hydrogen peroxide method. The ultrasonic treatment and sequential extractions with alkali and alkaline peroxide under optimal conditions led to a release of more than 93% of the original hemicellulose. The effects of experimental variables, including pH value, reaction temperature and time, hydrogen peroxide content, and magnesium sulfate dosage on hemicellulose content were investigated. The obtained hemicelluloses were characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), and comprehensive thermal analysis (TGA), which showed that potassium hydroxide significantly affected the yield of relatively pure hemicellulose.
A Finite Element Analysis on SAW Sensor for Torque Measuring
Authors: Wang Li Jiu , Zhang Yun Tao
Published: January 2015

When detecting torque with surface acoustic wave (SAW) resonator sensors, the real strain of the host structure is not exactly consistent with the strain of SAW resonator due to material mismatch and the finite-thickness adhesive problem. A 3-layer (host structure, adhesive, and resonator layer) model is established. Finite-element Analysis (FEA) was used to investigate the strain transfer from the metal substrate to the SAW resonator (SAWR) through a bonding layer. The results show that the values of the strain transfer rate of FEA agree well with the experimental data. It can be concluded that FEA is of great value for SAW sensor design and sensing applications.
8PSK Signals with 50% RZ Clock for Optical Access System Applications Using Phase Equalization Technique in MSPE
Authors: Shao Yu Feng , Wang Shi Kui , Wang An Rong , Shen Shi Lu , Chen Luo , Chen Fu Ping
Published: January 2015

A multi-symbol phase modulation format, the 8 phase shift keying (8PSK) with 50% return-to-zero (RZ) clock, is proposed and demonstrated in this scheme for 30-Gb/s optical access downlink transmission applications using phase equalization technique in MSPE. RZ-8PSK optical signals are generated by cascading three phase modulators and a dual-arm Mach-Zehnder modulator. Superimposed 50% RZ clock is extracted and recovered for achieving access restoration. The result show the reception performance of 50% RZ-8PSK signals with phase equalization after transmission over SMF-28 is good.
Simulation-Based Performance Degradation Prognostics of Electro-Hydraulic Servo Valve
Authors: Zhao Zi Tan , Guo Jian Bin
Published: January 2015

Simulation-based performance degradation prognostics should firstly obtain the judgment criterion to predict degradation failure, how systems or its components degenerate, and then how to display effect of degradation process on performance. In this paper, we presented a model-based performance degradation prognostic method to address this problem. For Electro-Hydraulic servo valve case, it has strict demands on performance. Degradation of the valve is propagated forward in time and influence on performance output. The proposed degradation prognostics method is illustrated through performing comprehensive simulation experiments.
Protecting Distance of Scattering between DC Transmission Line and Receiving Station of AM
Authors: Liu Xing Fa , Zhang Jian Gong , Gan Zhe Yuan , Tang Bo
Published: January 2015

In the construction of UHVDC power line in China, the national standard of reradiation interference protecting distance between UHVDC power line and receiving station of AM broadcasting needs to be renewed. In this paper, the wire-surface simulation model is used to calculate the interference. In the model, steel tower is represented as surface model, ground wire is represented as wire model, and the whole model is excitated by vertical polarization plane wave. For the deficiency of traditional solution method of protecting distance calculation, a new method is proposed. It is recommended that the whole work frequency band of receiving station should be calculated to determine the space interval which has actual protecting distance. Then the interval is gradually narrowed with dichotomy method until the interval size is within allowable value. With the first-grade receiving station of AM broadcasting as example, the reradiation interference protecting distance from UHVDC power line and station is calculated..
The Short-Term Reliability Assessment of Distribution Network Based on Conditions Dependent Element Failure Rate
Authors: Yuan Guo Xun , Lin Song , Xu Yang , Zhao Can , Dong Lei , Liu Ke Wen
Published: January 2015

Specific to the demand for the actual operation, this paper calculates short-term failure rates of various types of elements by adopting improved conditions dependent model: temperature-dependent element aging failure model, weather-dependent occasional failure model, current-dependent overload protection model, and processes a short-term reliability assessment by forward failure diffusion algorithm. Example analysis is simulated by 11kV distribution network of IEEE RBTS Bus-2 system to prove the reliability assessment model, the reliability assessment process are effective and provide on-site operation and maintenance personnel with guidance for decision making in the short-term scheduling and online operation.
Analysis and Governance of Hoist Converter Harmonic Based on Improved HHT
Authors: Zheng Jin Yan , Li Zhen Bi , Zhang Ling Zhong
Published: January 2015

Due to a variety of electrical equipment using, the grid power quality severely polluted. For current harmonic signal is generated in hoist converter, the methods is proposed based on Hilbert-Huang Transform (HHT) to detect current harmonic signal and improved Active Power Filter (APF). The simulation mode is established by MATLAB/Simulink software about shunt APF+SPWM inverter hybrid active filter device for harmonic motion detection and suppression simulation. The results show that the harmonic of hoist converter can be detected by this design method real-time and the harmonic can also be suppressed validly.
Preparation of Al-MCM-48 and Ti-MCM-48
Authors: Zhao Zhi Xi , Zhang Li Ming , Chen Ping
Published: January 2015

In system of cetyltrimethylammonium bromide (CTAB), tetraethyl orthosilicate (TEOS) and sodium hydroxide, the mesoporous sieves MCM-48 with hetero atom could be synthesized by adding different aluminum and titanium sources. The results showed that M41S family of hexagonal (MCM-41), cubic (MCM-48) and lamellar phase (MCM-50) could be synthesized respectively through hydrothermal method by adjusting the alkalinity in synthesis gel exactly.
Development and Implementation of SVPWM Three-Phase Inverter
Authors: Dong Chen Lu , Zhu Long Ji
Published: January 2015

Aim at the development and realization of SVPWM three-phase inverter control by DSP, the concrete of method and technology by DSP of SVPWM control is given, the complete hardware circuit and DSP control program is designed, the core of source program and setting method of DSP register are given. The results show that, voltage waveform output from SVPWM three-phase inverter is stability and reliability, output frequency with high control precision. The paper has good applied value for engineering development of inverter.
A Comprehensive Dispatch Management System for Distributed Generation Based on Cloud-Computing Technology
Authors: Zhang Jian Xing , Zhang Yu , Cao Zhi Hui , Liu Jin Song , Gu Xin Xin
Published: January 2015

At present, China has built a number of DG (distributed power generation) demonstration projects as part of intelligent cities, intelligent business parks, university campuses and residential areas. The interaction mechanism, among DGs-especially those with energy storage, the users and the distribution grid need to be clear; i.e. how to unify the coordination among solar power systems, small wind power generation systems, the battery energy reserve systems, and electrical vehicles, so as to optimize resources allocation, cut peak and compensate trough loads; how to enable future homes and business users has more flexibility, controllability on electricity usage thus to advance the technology development in the field of electricity usage. The above mentioned problems can be solved smoothly by researching on the comprehensive use of modern power electronic technologies, communication technologies, computer and network technologies, advanced sensor and measurement & control technology, to combine them together for monitoring, protection control, cloud computing , and management of power supply department for active distribution network after DG access, to constitute the comprehensive dispatching system based on the DG of cloud computing. Dispatching of DG for distance dispersion location and a huge number of terms, to based on the cloud computing is very cost-effective, and it is worthy of further study and application.
Study on the Characteristics of Low-Frequency Vibration of the Core of Single Phase Transformer Set Caused by GIC
Authors: Pei Xiao Ran , Liu Lian Guang
Published: January 2015

The study on characteristics of transformer vibration caused by GIC is the foundation of studies on transformer noise caused by GIC, location selection of monitoring vibration and noise. In this study, the characteristics of low-frequency vibration of the core of single phase transformer sets caused by GIC have been analyzed through building mathematical models and experimental analysis. The results show that when DC bias occurs the vibration signals contain 50 Hz and 150 Hz vibration. With the degree of DC bias the 50 Hz vibration grows by linear increase and 150 Hz vibration grows by square increase. Affected by GIC, the 50 Hz and 150 Hz vibration waveform’s phase changes with alternate 0 andπ. The characteristics of 50 Hz and 150 Hz vibration discriminate between core vibration caused by GIC and HVDC grounding currents. This study has significance for vibration monitoring of transformer faults, and can assist in determining the level of GIC.
Design and Implementation of Speech Navigation System Based on Android
Authors: Yang Li Ping , Wang Wei , Xu Da Wei
Published: January 2015

Using the TTS technology and Svox engine in the Android platform, this paper puts forward the design scheme of the speech navigation system based on Android. The Android platform and structure are introduced firstly, then the system structure and functions are detailed described, lastly the key technology and implement way is given. This system developed methods for the visually impaired application areas have certain guiding significance and the actual practical application value.
Encoding and Decoding Schemes for MIMO System Combined with Convolutional Code
Authors: Geng Jia
Published: January 2015

To introduce extra coding gain to Multi-input Multi-output (MIMO) system, how to combine MIMO and convolutional code (CC) was studied in two cases. In the first case, the type of MIMO was limited to pure spatial multiplexing. Then in the second case, the type was extended to the hybrid of spatial multiplexing and transmission diversity. Several encoding-decoding schemes were designed. For each scheme, its advantage and disadvantage were analyzed, and bit error rate performance was evaluated by simulation. Finally the scheme with best performance and acceptable complexity was elected from candidates for each case.
Adaptive Algorithm for Anti-Jamming in Broadband Communication
Authors: Cui Jian Hua , Cheng Nai Ping
Published: January 2015

This paper presents a method to suppress narrowband interference in the direct sequence spread spectrum communication based frequency domain adaptive algorithm. The method determines the interference threshold by N-sigma algorithm and calculates the cut-off condition by separating the signal. The method suppresses the narrowband interference by frequency domain batch algorithm. This paper gives a detailed design method and simulation results, and makes a performance comparison with other methods. The results show that, the method in this paper has better performance than other methods. It is suitable for narrowband interference suppression in broadband systems.
Synthesis of Alkyl Polyglycoside and its Application in the Glyphosate
Authors: Xu Guo Mei , Shi Tie Jun
Published: January 2015

Using sweet potato starch, butanol, and dodecyl alcohol as raw materials, the alkyl indican surfactant was synthesized by two-step reactions with composite catalysts of p-toluene sulfonic acid and citric acid, the synthesis conditions were investigated through orthogonal method and the structure of the product was characterized by IR and mass spectroscopy. The weeding test was also studied by adding the appropriate proportion of alkyl indican surfactant. The results showed that the best technological conditions was: reaction took place under 120 C and last for 4 h, msweet potato starch:mn-butanol: mn-dodecanol=msp:mnb:mnd=1:2:5, the content of composite catalysts was 1.6 wt% p-toluene sulfonic acid and 10.0 wt% citric acid. The weeding test demonstrated that added 1% APG into the glyphosate could killed almost all weeds in five days and had an excellent weeding efficiency. Compared with spraying glyphosate with no APG, which could decrease the amount of glyphosate used and protect the environment.
An Analog-Digital Clock DLL Control Circuit Used for High-Speed High-Resolution Digital-to-Analog Converter
Authors: Li Tie Hu , Zhang Rui Tao , Yang Wei Dong , Chen Guang Bing
Published: January 2015

An analog-digital clock delay locked loop (DLL) control circuit is proposed to detect and adjust the analog-digital clock phase difference in real time in a 14-bit 2GSPS digital-to-analog converter (DAC). To achieve a reasonable analog-digital clock phase difference, a digitally controlled delay line (DCDL) should be able to provide a total clock delay up to 1024ps. Such fine control is realized by a control block tracking and maintaining the precise phase relationship between analog and digital clock domains. The control circuit is realized by designing a digital finite state machine (FSM) carefully. The proposed circuit is implemented in 0.18μm CMOS technology. Simulation results show that the proposed circuit performs well in various conditions in high speed data transmission applications.
A New Method of Doppler Frequency and DOA Estimation Based on Gradient-Time-Delay
Authors: Sun Hong Yan , Wang Chun Yang , Yu Yan Xin , Chen Yu , Wang Xue Mei
Published: January 2015

This paper proposes that arrays of spatio-temporal data matrix was constructed by the arrays of the received signal delayed in time gradient, Meanwhile, applying the method of ESPIRT to get the twiddle factor of the received signal array element and the array element of the time and the space, finally get the final information of Doppler frequency and the information of arrival angle though applying least squares method.
Research of the VLF Atmospheric Noise Statistical Prediction
Authors: Li Guang Ming , Li Chang Jun , Li Quan Na
Published: January 2015

The nature of the vlf atmospheric noise can have a dramatic effect on the performance of the vlf receivers. To understanding how the receivers will perform in different locations and time, the key is proper predicting the critical parameters of the vlf atmospheric noise. Based on the purpose, according to the historical data and the corresponding frequency and parameter variation chart, established the data fitting algorithm to predict the critical parameters of the vlf atmospheric noise. By simulating and comparing with the measured data, testified the effectiveness of the vlf atmospheric noise prediction method. To grasp the change rule of critical vlf noise parameters with time and geographical position is helpful to improve the vlf communication effectiveness.
Research on the Effects of Iron Loss to the Maximum Wind Power Point Tracking
Authors: Xiao Hao , Gao Gui Ge , Zeng Xain Wen , Pei Ze Yang
Published: January 2015

In the traditional motor-side converter control strategy of double-fed induction generator, because of the stator resistance led to the observation of the accuracy of the stator flux is affected. Academia therefore put forward a lot of improvements, but little attention to the impact of the iron loss. Due to the iron loss exists of double-fed induction generator during operation, and the size of the iron loss change with the wind speed will led to the accuracy of Maximum Power Point Tracking. This paper presents a new control strategy and through MATLAB simulation demonstrates the effective of the strategy.
Development of RFID Reader System Based on Android
Authors: Chen Ji Hai , Li Qiu Jun
Published: January 2015

For the museum artifacts management,designs a Android RFID reader, based on ARM and ImpinjR2000. This paper provides the main hardware’s circuit design, and RFID reader application software design’s process.
The Pulse Signal Preprocessing and Feature Points Recognition Based on MATLAB
Authors: He Liang Yu , Liu Min Sheng , Chen Qi Yue
Published: January 2015

For the pulse wave signal acquired by the pulse analyzer, it’s necessary to remove the large number of noise signal by noise reduction processing. For signal noising processing using wavelet transform method in the time domain and frequency domain and the signals can characterize the ability of local information, and it is self-adaptive. Determine the main wave peak and trough points based on extreme value method and pulse wave periodicity, using the threshold method to determine the dicrotic wave starting point and dicrotic wave peaks, we also use the MATLAB programming to implement the algorithm.
Application of Halcon in Digital Image and Signal
Authors: He Yang Ming , He Yan Qiu , Xiong Guang Yao , Zhu Ming Feng
Published: January 2015

Halcon is a machine vision software. It can process all kinds of image processing problem. In this paper, Halcon is used to process moving targets detection, from which it can be seen how the software Halcon is used to process digital image. The algorithm includes region_ growing algorithm, image filtering and morphological operators, etc. The software Halcon can be used in digital signal, too. In the end, it is used to process pulse signal. The result shows that Halcon has powerful functions in digital data processing.