bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Wide-Area Automatic Switchover System Based on EMS
Authors: Dai Shi Yong , Pan Fan , Liu Fei
Published: June 2013

The traditional automatic switchover device installed in substation only uses local real-time information to make control strategies, with the logic of device predetermined, so it could not adapt to different operating modes. A new wide-area automatic switchover system based on energy manage system (EMS) is proposed in the paper. The wide-area automatic switchover modeling is established through automated modeling and the real-time rest oration control is implemented. The system solves the power supply restore under serial single power supply failure. By comprehensive use of information of the whole network, the automatic switchover can coordinate with other automatic security devices and protections. In addition, the control strategies and network security will be checked and modified in order to prevent from overload and improve security of automatic switchover strategies. The system has been used in Guangdong power grid of China.
Analysis on Storage Power Saving Technology and its Extension Influencing Factors
Authors: Wang Xiang Bing , Zhu Xiao Hong , Wang Ya Juan
Published: June 2013

The cancellation of time-of-use tariff setting policy from State Development and Reform Commission made certain impacts on the extension of storage power saving technology. The advantages and disadvantages of storage power saving technology for involved participants are analyzed. It is concluded that storage power saving technology is not on favorable moment for promotion, however, it still worth to be promoted. The conflict of electricity coal market pricing with state-fixed electricity price should be fundamentally solved by government and the compensation for existing storage power users needs extra works. Furthermore, in order to remove the obstacles in storage power saving technology promotion, it is urgent to improve the energy consumption efficiency of energy storage apparatus.
Study on Reasons of the Falling of the Overhead Line Based on Fault Tree Analysis
Authors: Wei Fei Xiang , Song Yang , Ma Xiao Xu , Qian Ying
Published: June 2013

The transmission line is an important part of the power system, its reliability will directly affect the reliability of the power system. The reliability of the overhead line plays a crucial role for the power system reliability. This paper analyze the reasons of the falling of the overhead lines, establish a fault tree, and make qualitative and quantitative analysis of the fault tree.
A Direct Method for Searching Power System Second Order Resonance Point
Authors: Lin De Qing , Yuan Xiao Dong , Li Qun , Fang Yong
Published: June 2013

The dynamic characteristics of the power system will be a sharp deterioration near the second order resonance point. In-depth study of the Power system dynamic characteristics near the second order resonance point, and then how to cause the dynamic characteristics of the system worse at the second order resonance point near the stable boundary, need to quickly search system of second order resonance point. Based on the principle of minimal expansion system method, this paper presents the direct method for search the second order resonance point in power system. For the N dimensions differential dynamic system was established in the 4N+4 dimension expansion equations. The power system second order resonance point search is changed into expanding equation fixed point solution. Significantly reduce computational load, improve the search accuracy for solving second order resonance point calculation. For in-depth study of power system dynamic characteristics near the second order resonance point have a certain value.
Transmission Network Status Monitoring Overview
Authors: Ling Hao Yi , Wang Ling Mei , Zhao Xing Yong
Published: June 2013

Transmission lines is an important part of the power system. Transmission line condition monitoring system can enhance the operational reliability of the grid line level of safety, at the same time lay the foundation for intelligent transmission line. Insulator contamination monitoring , lightning monitoring, environmental monitoring, wire breeze vibration monitoring online monitoring technology on the existing transmission line condition monitoring technologies , including comparative analysis of the far-reaching. It can reduce the workload of the artificial line inspection , to reduce the occurrence of pollution flashover to improve power supply reliability. To reduce the pollution flashover occurred to improve the reliability of power supply. Condition based maintenance decision support and sharing of information with other systems. HOMER and MATLAB simulation software , simulation , historical data analysis . Export real - time wind speed data, provide data to support the conductor galloping and aeolian vibration of monitoring and environmental monitoring.
The Development of Modular Electrical Fittings for Transmission Lines in Intelligent Distribution Network
Authors: Huang Jing Yao , Zhang Chao , He Ming Chuan , Yang Shuang , Zhao Hui Jie
Published: June 2013

Spacers, for example, this paper introduces the developing process of energy efficient transmission line modular electrical fittings in distribution network. It uses glass fiber composite materials and non-magnetic as the main material which does not produce or produce very little hysteresis and eddy current losses. It has no corona and its energy saving effect is obvious; anti-dancing, high mechanical strength. Refer to the knowledge of aerodynamics to design the structure, not only effectively prevent the connection joint of different materials connected to the wear and tear, and can effectively reduce wind noise, thus reducing friction and shock losses .It not only replaces the expensive and rare metal materials such gold, and provide simple and economical solution for upgrading the distribution network. It meets the transmission line spacers technical indicators, economic and social benefits significantly.
The Application of Risk Analysis Based on the Gray Relational Analysis in Power Engineering Comprehensive Evaluation
Authors: Ma Tong Tao , Li Cun Bin , Ren Li Na
Published: June 2013

Combined with the characteristics of power engineering projects, the paper introduces a kind of theoretical model that leads gray relational analysis and risk analysis into AHP appraisal method. This article describes the application steps of the model by a case. This article's main focus is the membership of risk index and the index weight. In the risk comprehensive evaluation model, the paper adopts the risk analysis method and gray relational analysis method to determine the membership and the weight of risk index. This model is considered to be the virtue of the subjective weight and the objective one. It can improve the accuracy of the evaluation.
Fault Analysis of Distribution Network which Contains Distributed Generation
Authors: Chen Ming Jun , Xuan Chen Zhu , Lian Xin Kai
Published: June 2013

when the photovoltaic power generation and thermoelectric power factory connect into the distribution network , the system change from one source to several sources. it will change the construction of the system and the system power flow ,and also the size and direction of short-circuit current. It is harder to prepare the grid protection devices and set value for the protection. This paper studied the complex electronic systems which contains wind farms and thermoelectric power factory, analysis the change of voltage and current of each bus when the fault happen after the photovoltaic power generation connected into the system, and also talk about how the fault location affect the system fault component .Then conduct the expression of the fault current of each line to provide the basis for the study of multiterminal supply network protection strategy.
Incentive and Punishment Mechanism Based Method Study of Power Quality Dynamic Comprehensive Evaluation
Authors: Yuan Jin Jing , Ouyang Sen , Jiang Jin Liang
Published: June 2013

A dynamic comprehensive evaluation method of power quality based on incentive and punishment mechanism is proposed. At the beginning, the index system is designed and unified. Next, the incentive and punishment mechanism model of each index is established. Then, the vertical and horizontal scatter degree method and minimal variability theory are applied to calculate the comprehensive evaluation value of all the indices on every time period and on the whole time series respectively. Finally, the realistic example demonstrates that this method can easily differentiate the quality of different evaluation objects.
Communication and Cyber Security Analysis of Advanced Metering Infrastructure of Smart Grid
Authors: Li Zhong Wei , Cheng Li , Zhang Hong Li , Tong Wei Ming
Published: June 2013

AMI (Advanced Metering Infrastructure) is the first step of the implementation of the smart grid. The communication network is the important part of AMI. The reasonable communication network architecture and effective cyber security measures are the keys of the realization of AMIs functions. The components, functions and communication network architecture are studied. Communication technologies that can be used in AMI are analyzed. Based on ZigBee, fieldbus/industrial EtherNet and GPRS, a typical AMI are constructed. The cyber security threats, communication data types and cyber security requirement of AMI are analyzed. The cyber security strategy and implementing scheme are offered. The communication standards and cyber security standards that can be referred while constructing AMI are analyzed. The necessity that publishes AMIs communication standard and cyber security is put forward.
Fault Diagnosis for Shaft System of Hydropower Unit Based on LS-SVM
Authors: Zhou Ye , Tang Shu , Pan Luo Ping , Li Ping Ping
Published: June 2013

In this paper, shaft monitoring data in condition monitoring system of hydropower units was used to build the fault classification model based on the least square support vector machine (LS-SVM). By the wavelet packet signal decomposition for unit vibration signal, setting the signal energy components as the study sample, learning of fault diagnosis classifier was conducted, to achieve the diagnosis of common faults in shaft running of hydropower unit.
The Analysis of the Thunder and Lightning Cause about the Airport Automatic Charging Station and the Lightning Model
Authors: Han Gu Yong , Wang Bao Cheng , Zhou Jun , Lu Song
Published: June 2013

Lightning is a special and spectacular phenomenon of the sound, light and electricity in the nature. Due to lightning discharge releasing a huge energy in a very short time and forming a large current and high voltage with strong destructive, it will take a great threat to people, equipment and facilities. From a long time, the lightning protection is always an important question in the electrical construction engineering design and construction, which scientists in the countries all over the world must consider in. This paper analyses the thunder and lightning causes of a civil aviation airport, according to the average annual lightning days we calculate the lightning activity intensity in some region, on this foundation, we establish the lightning threat model of the civil automatic charging station, and provide the theory basis for the lightning protection design and the analysis of the lightning threat model of the automatic charging station.
Workability and Mechanical Properties of Concret with Different Admixtures
Authors: Li Yun Feng , Han Mi Xue , Xu Li
Published: June 2013

The mineral admixtures mixed into concrete have important effects on concrete performance. The workability and mechanical properties of the concrete are studied with different dosages of admixtures, such as steel slag powder, blast furnace slag powder and fly ash. The results show that fly ash has more advantages in improving the performance of the concrete. When steel slag powder, blast furnace slag powder and fly ash, respectively, replace the amount of cement to 30%, 30%, 20%, the mechanical properties of the concrete are improved significantly.
New-Type Hybrid Active Power Filter of Microgrid
Authors: Li Sheng Qing , Li Yong An , Zeng Li Lin , He Zheng Ping
Published: June 2013

Hybrid active power filter has been used widely in the engineering application. It often be in idle and low power working state. The grid inverter can't keep in real-time rated output conditions, the output capacity of it got wasted. A kind of new-type HAPF device of microgrid was put forward. This device can realize grid-connected power generation of distributed generation and do not affect the original improve power quality function of HAPF. An improved id-iq composite instructions current detection and synthesis method was used, the simulation results were given in the end.
Optical Fiber Sensor Salt Dense On-Line Monitoring Research
Authors: Liu Gao , Wu Li Hui , Liu Bao Qiang , Zhang Hu , Zheng Jin Bei , Shen Hong
Published: June 2013

To detect the pollution level of insulators in operation, based on light energy loss theory of medium optical wave guide and mathematical modeling of least squares supporting vector machine, by a lot of contrast tests, this paper designed and developed monitoring terminal of optical sensor. Collecting live temperature, humidity luminous flux attenuation etc. and sending the collected data to data monitoring centre through GSM data communication module, the workstation of data monitoring centre could calculate to get equivalent salt deposit density (ESDD) using mathematical model, so that insulators pollution level can be detected on-line automatically and continuously.
Early Age Cracking Characteristic of Concrete with Compound Admixtures
Authors: Li Yun Feng , Zhang Dong Sheng , Xu Li
Published: June 2013

The shrinkage cracking of concrete plays an important role to the accelerated deterioration and shortening the service life of concrete structures. The mineral admixture will be a perfect component of high performance concrete and its utilization will be a valuable resource for recycling. Early age cracking characteristics of concrete with compound admixtures, such as steel slag, blast furnace slag, fly ash, are studied in this paper using plate test method. The better anti-cracking performance of concrete will be realized when blast furnace slag replacing cement at 30%, steel slag and fly ash as the equal mixture components replacing cement at 30%, three kinds of admixtures replacing cement at 30% under the proper proportion.
A Study of Clinic of Leukoaraiosis and Stereoscopy of Nuclear Magnetic Resonance
Authors: Chen Jia Jun , Yang Xiu Feng , Zhao Yun Hua , Jin Xi Ya , Li Yuan Bing , Huang Li Hong
Published: June 2013

Purpose: study neuropsychological features of patients with leukoaraiosis (LA), quantify the volume of nuclear magnetic resonance in the head by stereoscopy method and discuss its clinical significance. Method: divide into LA group and the contrast group according to MRI in the head. Quantify volume of nuclear magnetic resonance in the head in the LA group by stereoscopy method and analyze it by mini-mental state examination (MMSE), activities of daily life (ADL) and dangerous factors. Result: MSE grade of LA patients decreases obviously, indicating that LA patients have obstacles in general cognitive function. MMSE grade and ADL grade are in negative correlation. Different grades of LA are in positive correlation with its volume. Hypertension in the LA group stands at the first place and hyperlipidemia the second place. Conclusion: 1LA is closely related to hypertension. 2LA is closely related to declination of cognitive function and mainly influences cognitive functions such as memory, attention, computing ability and visual space etc; and LA is related to declination of activity ability in daily life. 3 Different grades of LA are in positive correlation with the volume and volume of LA is in positive correlation with cognitive obstacles and declining degree of activity ability of patients in daily life. 4 the relevance ratio of LA can be raised by MRI.Leukoaraiosis (LA) [1] is a group of clinical syndromes described by iconography caused by diverse pathogenesis. LA often causes declination of cognitive functions and is often regarded as an earlier sign for cerebral lesion since it mainly damages subcortex functions [2]. Stereoscopy method can calculate volume, length and superficial area of specific objects and regions [3].
An Optimal Estimation of Aerodynamic Parameters for GPS Guided Missile
Authors: Yan Li , Yang Chen , Ding Chuan Bing
Published: June 2013

The disturbance factors in the missile flight are obvious,so the analytical equations of missile longitudinal disturbance of movement is derived . The missile body longitudinal aerodynamic parameters are fitting out with wind tunnel experimental data. The equation of system state takes the aerodynamic coefficient errors interference source and GPS error sources as the state variables, and the system measurement equation adopts GPS pseudo-range measurements. In passive segment, the aerodynamic coefficients disturbing errors sources of th missile longitudinal plane is estimated optimally with extended Kalman filter. The results show that the method accelerate the convergence speed of the disturbance source errors, and improve the estimation accuracy of the perturbation errors.
Concerted Systems for Increasing the Survivability of the Aircraft against Terrorist Threats
Authors: Boşcoianu Mircea , Cioacă Cătălin , Rău Cristea Gabriel , Cîrciu Ionică
Published: June 2013

The paper explores the threat posed by terrorism in aviation domain, especially surface-to-air missile attacks against transport aircraft. While the focus of this paper is the mitigation of security risks in the aviation domain, the proposed solution based on concerted countermeasure systems discussed here may be developed in the context of homeland security policy promoting the principle of flight safety. The reception and the processing of data through the detection of signals emitted by various sources are proceeding in the absence of users interest about the form of the wave of the message. The detection of the presence / absence of the signal or the identification of its value is proceed by identifying the signal associated to each value of the message, considered a discrete variable, hence triggering of the adequate defence mechanism.
A Fault Detection Method for Attitude Sensors of Satellite
Authors: Burdusel Constantin
Published: June 2013

Any system based on data acquisition from different sensors has important characteristics of quality and fiability that are given by the detection and the isolation of the sensors faults. This paper presents two methods of fault detection, applicable in aerospace domain, used in satellite systems, and the simulation of the functionalities of the methods using Matlab. Both methods are based on the estimation of the sensors fault by analysing the differences between the measured value and the estimated one, using an EKF estimator [.
Keywords: EKF filter, fault detection, satellite sensors, t-test
Incremental Pneumo-Hydraulic Positioning Unit
Authors: Avram Mihai , Bucşan Constantin , Duminică Despina , Besnea Daniel
Published: June 2013

The paper describes the construction of an original linear pneumo-hydraulic positioning unit developed by the authors. The mathematical model that describes the functioning of the unit and the simulation results are also presented.
The Determination of the Oxygen Transfer Speed in Water in Non-Stationary Conditions
Authors: Băran Nicolae , Pătulea Alexandru Sorin , Căluşaru Ionela Mihaela
Published: June 2013

The paper presents a method for computing the oxygen transfer speed in water in non-stationary conditions. The theoretical results are verified by experimental researches performed on a new type of fine bubbles generator; the variation of O2 concentration in water is measured electrically, using an oxygen meter.
A Compact Hybrid Sound Absorber Using Flexible Micro-Perforated Panel and Piezoelectric Actuator
Authors: Zheng Wei Guang , Lei Ying Feng , Huang Qi Bai , Li Chuan Bing
Published: June 2013

This paper presents the concept of a compact hybrid sound absorber, based on a combined approach for sound absorption. A flexible micro-perforated panel (MPP) is used as the passive sound absorber for mid and high frequencies and a piezoelectric patch as the active control actuator for low frequency. The volume of this new absorber is highly reduced compare to conventional hybrid systems which employ porous layer as passive part and loudspeaker as active part. The vibration effect of the MPP in the hybrid system is also considered. Theoretical and experimental results show that the flexible MPP has the potential to dissipate more energy and can be utilized to improve absorption performance of the hybrid system by appropriately selecting its parameters.
Mechanical Analysis of Fracturing String with Double Packers in Horizontal Well
Authors: Li Zhi  Miao , Yue Qian Bei , Liu Ju Bao
Published: June 2013

The design and mechanical analysis of fracturing string was one of the key technical problems in fracturing operation. Considering contact friction and curvature effect, contact nonlinear problem of fracturing string was solved by space beam element and multidirectional contact gap element method. Contact state, contact reaction force and corresponding frictional resistance between the fracturing string and borehole or inside casing wall could be accurately described by gap element, which generated less simplification in the mechanical model and more precise calculation of force and deformation. The calculations of field examples has shown that while the distance is 10 m, 20 m or 30 m between two packers of fracturing string, maximum axial sliding displacement of the first packer is 0.19 mm and sliding displacement of the second packer is 11.17mm, 23.78mm , or 36.46 mm. The theory basis is provided for the decision of reasonable distance between two packers.
Orbital Injection Errors and Sensor Requirements for NERVA Space Launchers
Authors: Rugescu R.D. , Constantinescu Cr.E. , Barbelian M.Al. , Bogoi Alina , Dumitrache C.
Published: June 2013

The input module of the NERVA space launcher guidance system consisting of the inertial and sensor platform is responsible for the basic accuracy if the ascent trajectory and injection efficiency. The sample rate magnitude and data filtering along the real time trajectory are the only tools available for improving the guidance accuracy up to the level of requirements to secure admissible orbital injection error and the subsequent flight corridor during the orbital ascent. Analysis of the NERVA-1 flight telemetry flow from the onboard inertial platform raises the problem of the optimal selection of the onboard sample rate and of the rate of telemetry, which are not identical. The orbit injection errors are chosen from the orbit altitude constraints and subsequent accuracy requirements for the inertial sensors are derived. They show that the accuracy requirements are moderate and may be covered with almost conventional sensors. To improve the flight guidance accuracy the rocket motor chamber pressure and thrust are measured and observation of the preflight zero drift, recording noise and of the high level of embedded noise during both powered and coast atmospheric flight is performed. Simple filtering based on frequency Fourier analysis is delivered with conclusions regarding the intelligent algorithm enhancement that are developed and implemented on the next generation of flight research drone missiles RT-759M NERVA-2, right in preparation. The main rationale of that algorithm stands in the method of discriminating between false and true information on each measuring point immediately after the data are delivered by the sensors. Learning procedure from previous preflight recordings and from gradual accumulation of concurrent data streams subjected to FF spectral analysis are combined to improve data filtering, for immediate release to the next module of the autopilot. The rate of sampling is optimized from the analysis of the previous flight, inertial data records and test stand pressure and thrust records that show the level of noise. The behavior of the electronics under the dynamical loads of the rocket flight, involving overloads of more than 20 g-s and the level of vibration during the real flight and other sources of measuring errors are also focused in the research. During simulated work of the sensor platform the algorithm has been acceptably validated and prepared for real flight test performance. Information important for the NERVA autopilot design activity is structured through the multiple variance approach.
Direct Determination of the Metallic Elements in Wine Using Atomic Absorption Spectrometry
Authors: Zhu Na , Li Zhi Fen , Liu Hao , Yang Li Kun , Wang Hong Wei
Published: June 2013

This method of sample preparation for iron, copper, manganese and zinc in wine were studied in this paper. At the preparation period adopted a method using nitric acid to extract, which mostly reduced the losing of metals and saved the time. Determinate the iron, copper, manganese and zinc in wine by AFS, and the recovery is in the range of 102.4 %~107.8 %, and the relative standard deviation is in the range of 0.955 %~3.806 %.
Properties of Alumina Green Parts via Selective Laser Sintering Combined with Cold Isostatic Pressing
Authors: Liu Kai , Li Chen Hui , He Wen Ting , Shi Yu Sheng
Published: June 2013

To obtain complex shape alumina ceramic parts, a composite powder of epoxy resin binder E-06 and alumina powder were laser sintered combined with cold isostatic pressing (CIP). Experiments on selective laser sintering (SLS) and CIP were carried out to probe the influencing factors in the processes of forming alumina green parts. When laser power, scan speed, scan spacing and layer thickness were, respectively, 21 w, 1800 mm/s, 100 μm and 150 μm, the density and bending strength of alumina parts were relatively high. Following that, we experimented on different CIP maximum pressure which had different effects on densification of SLS alumina parts, the whole process in CIP was divided into two stages of I and II. Finally, the optimized SLS/CIP alumina parts were degreased and then sintered in 1600 °C for 2 h to produce crack-free alumina parts.
Research on Mountain Landslide WSN Monitoring System for Karst Area
Authors: Liu Zhen Xiang , Wang Xin , Shi Yong Heng , Zhao Meng Long
Published: June 2013

This paper, based on the origin of Karst Area landslide and the geographical conditions of Guizhou, studies the application of WSN technology on monitoring and forecast landslide and other geological disasters in Karst, and then put forward a landslide monitoring plan. We study the data acquisition layer node topology, and construct WSN monitoring system and test it under the stimulated environment. The result has shown that, the constructed monitoring system can meet the need of real time monitoring of landslide stability in Karst Area.
Reactive Postural Response in Bipodal Balance Analysis
Authors: Baritz Mihaela Ioana , Cotoros Diana
Published: June 2013

In this paper we present some considerations concerning the determination of the reactive postural response, measured and analyzed in a bipodal balance study. This study allows the emphasizing of the subjects’ postural reactions when the balance on axial direction exceeds the base of support (BOS). In the first part of the paper, we present the types of bipodal supports and we analyze the sensorial influences. In the second part we present the recording and analysis system and also the results and conclusions upon the determination of reactive postural response (RPR) in bipodal balance situations.
The Application of CCD Sensor in Fabric Defect
Authors: Xu Guo Sheng
Published: June 2013

In order to detect the fabric defects automatically, a real-time system and algorithm for the detection were developed in which the hardware part included image acquisition, signal processing and illumination device. The ring data model of defect silhouette is constructed to subsequent defects analysis. At last, examples prove that this algorithm can accomplish extraction of fabric defect silhouette preferably. The verification indicates that the design can satisfy the requirements of practical application well and make the detection flexible and convenient.
A Research on the Application of Kohonen Neural Network to the Corrosion and Testing of Vehicle Equipment
Authors: Xu An Tao , Luo Bing , Zhang Fan , Jin Fu , Zhang Tian Ru
Published: June 2013

Based directly on the neural network weights from testing and evaluating the coatings on real vehicle equipment, by inputting the values of the EIS characteristic parameter received from the real vehicle testing, memorizing the neural network weights under guideless training, it provides a quick and convenient method to evaluate the protective performance of vehicle equipment coatings, and thus the quick testing of the corrosion severity of vehicle equipment can be achieved.
Minimization of Total Processing Time in Semiconductor Photolithography Process
Authors: Park You Jin , Hwang Ha Ran
Published: June 2013

This paper focuses on a scheduling problem in photolithography process of semiconductor manufacturing. The photolithography equipment can be divided into three main parts, that is, scanner, spinner, and developer. Generally, in like manner to the other processes, the identical product types are processed at the same time in photolithography process since a certain amount of recipe change time is required whenever product type is changed. So, in this research, we consider multi-product production case with different processing times and flow recipes, and then attempt to reduce total processing time in photolithography process. From this research, we show that the total processing time can be minimized if we give a variety of input orders of lots and wafers.
The Design of Temperature Measuring System Based on ARM
Authors: Sang Jin Ge , Yu Guo Li , Wang Ya Nan , Zhang Jun
Published: June 2013

t gives a new type of Temperature Measuring System equipped with Samsung S3C2410. Chip DS18B20 is responsible for collecting temperature data, which was transmitted to the chip of S3C2410 in the way of digital signal. The hardware composition and software design of the system were discussed in detail. The experimental results indicate that the design improves the system stability and reliability.
Geothermal Parameters Test System Based on ARM S3C2440
Authors: Peng Bai , Xu Jun Ming , Zou Si Qiang
Published: June 2013

A test system for geothermal parameters is designed with S3C2440, it is an embedded system which can friendly display the test values and geothermal parameters in real time. The test theory is based on heat balance principle. A heater produce heat to induce into the ground through U buried tube. When equilibrated, the heat from the heater is equal to the heat taken away by ground. The heat taken away by ground is measured by testing the temperatures of two ends of U buried tube and the water velocity flowing through tube; the real produced heat by heater is measured by testing the current and voltage of heater. The heat power can be changed by controlling solid-state relay with PWM. The driver programs in S3C2440 for the testing sensor of temperature, current, voltage, water flow and PWM are designed with Linux; the testing values are real displayed and can be saved which interface is designed with OSS QT4.
A Dynamic Power Management Mechanism for Embedded System with Micro-Kernel Operating System
Authors: Chen Jing , Ke Yu Yung
Published: June 2013

As mobile devices of embedded systems prevail in our daily life, energy saving emerges as one very important issue and power management techniques are desirable. This paper presents the design and the implementation of a dynamic power management mechanism (DPMM) for embedded systems running micro-kernel operating systems. The DPMM is composed of policy manager, DVFS (Dynamic Voltage Frequency Scaling) controller, DPM (Dynamic Power Management) server, resource management flags, and DPM library. They are imple-mented to execute on an embedded system platform equipped with an XScale PXA270 processor and various I/O interfaces or devices running Zinix micro-kernel operating system. Testing results indicate that this DPMM effectively achieves power management in the system.
Multi-Channel Data Acquisition and CAN Communication System Based on Single-Chip Microcomputer
Authors: Wang Jian Ping , Jiao Guo Tai
Published: June 2013

Aimed at the problem that the traditional data acquisition system design with low efficiency and high cost. It is proposed that the C8051F040 microcontroller is based on the integrated A/D converter and CAN controller; utilize dynamic control simulation input quantity into the built-in A/D converter, process and store the data through the micro-processing unit, and use integrated CAN controller to transmit the data. From schematics design to the boards development, we have achieved the functions that acquisition of multi-channel data combined with CAN network communication through hardware and software debugging. The design of this product is small, powerful and wide used. It has good application and development prospects.
Design of Flexible Wing with Embedded Piezoelectric Actuator
Authors: Zhou Yu Hua , Ju Yu Tao , Zhou Chang Sheng
Published: June 2013

This paper introduces a new kind of flexible wing with embedded piezoelectric actuator as framework for Micro Air Vehicles (MAV), which was fixed spar in the previous flexible wing. This made it a controllable flexible wing because the new flexible wing can not only works as previous model without control, but also can change its wing profiles in our purpose by using the embedded piezoelectric actuator when its necessary. The mathematical model of the deformation of piezoelectric actuator under control has developed. with which the structure of the flexible wing was designed. The simulation of dynamic characteristic of the flexible wing with embedded piezoelectric actuator has been done with ANSYS software.
A New Mechanical Moving Device Based on the Polarization Navigation Method
Authors: Li Cheng Gui , Teng Ji Tao , Liu Xi Chun , Sun Yan Feng , Wei Peng
Published: June 2013

The polarization phenomenon occurs when the sunlight is scattered by atmospheric molecules. As a result, there is a polarization pattern in the sky. An amount of research shows that many nature insects can derive orientation information from this pattern, such as bees and ants. The fundamental polarization pattern in the sky is presented. The characters and the orientation mechanism of the nature insects are discussed. The basic principle of designing the polarization skylight navigation sensor is explained. The domestic and foreign relevant researches and application situation of this new navigation method are summarized in details. In the end, the characters of application fields and its application prospect are previewed.
Power Split Strategy of Plug-in Series Hybrid Electric Bus Based on Fuzzy Control
Authors: Wang Wen Wei , Lin Cheng , Ma Ke , Chen Jiao Yang
Published: June 2013

Plug-in hybrid electric vehicle has become a new global research and development hotspot with dual characteristics as electric and hybrid. Power split strategy influences fuel economy and emission performance. Selecting the plug-in series hybrid system used for bus as the research object, the power split and engine speed control strategy based on fuzzy control has been developed. The simulation results show that the strategy can improve the fuel economy and emission performance effectively.
Numerical Simulation of Bulging Process of Aluminum Alloy Sheet
Authors: Li Mao Ting , Zhang Yong , Kong Chui You
Published: June 2013

Basing on software MSC. Marc of non-linear finite element analysis, the article has studied the material flow in the process of aluminum alloy superplastic gas bulging forming. By analyzing of the thickness distribution of the molding member it confirm the danger zone in the forming process. By analyzing of pressure loading curve influence on forming part. Because the aluminum alloy is widely used in the industrial departments, it is supposed to improve the ability of forming ability of aluminum alloy by researching the superplastic forming.
Effect of the Er on Resistivity and Spreading Properties of Bi5Sb8Sn Solder Alloy
Authors: Li Shuai , Yan Yan Fu , Feng Li Fang , Wang Hong Na
Published: June 2013

In this paper a novel quaternary alloy is formed by adding a small amount of rare earth Er (RE) into Bi5Sb8Sn solder alloy to improve its technological properties. The influences of Er on the resistivity and spreading properties of the novel solder alloy were systematically investigated. Studied results show that adding 0.25~0.75wt.% RE into Bi5Sb8Sn solder alloy, the resistivity changes little,while the wettability demonstrated a significant improvement.The spreading area reaches 27.22mm2 and increases by 23% than the Bi5Sb8Sn matrix soler when the content of RE is 0.5wt.%.With increasing the content of Er ,the spreading area of solder alloy decreases, but it is still higher than that of the Bi5Sb8Sn solder alloy. It is mainly closely related to new phases with RE ,the form of compounds and thickness of interface intermetallic compounds in the Bi5Sb8SnRE solder alloy.
The Influence of Fe on the Strength and Ductility of Cu-10Sn-2Zn Based Alloys
Authors: Ding Ding , Wu Kang , Wang Li Li , Chen Xiao Hua , Wang Zi Dong
Published: June 2013

The In situ iron nanoparticle reinforced Cu10Sn2Zn alloy was fabricated by centrifugal casting in vacuum chamber with a medium frequency electrical furnace. The major challenge in development of this alloy is to fide an approach to strengthen copper alloys with the increase of ductility. In this paper, we fide an effective way to balance the strength and ductility by identifying three essential structural characteristics for nanoparticles: in-situ formation in molten metal, smallest feature size finer than 10 nanometers and coherency with surrounding matrix. The tensile strengths and the elongation of ZCuSn10Zn2+Fe1.5% were 550Mpa and 42%respectively, which were remarkably improved compared to ZCuSn10Zn2.
Preparation of Impact Resistance Epoxy Resin Encapsulating Materials
Authors: Zhang Kai , Fan Jing Hui , Ma Yan
Published: June 2013

According to research requests of encapsulating materials used in anti-impact precision electron apparatus parts, the materials system was designed on the relation of mechanics performance and techniques properties. Then epoxy resin E-51 was toughening modified with a kind of self-synthesized polyester epoxy resin which had liquid crystal groups. The results showed that the optimized epoxy resin encapsulating materials has high compression strength and favorable operating properties. The impact strength of prepared epoxy resin encapsulating materials increased 4.0 times, and the gel time at room temperature was over 100 minutes.
Study on Paraffin/Expanded Perlite Composite Phase Change Energy-Storage Materials
Authors: Li Qi Jin , Li Guo Zhong , Jiang Cong Cong
Published: June 2013

Paraffin/expanded perlite composite phase change energy-storage material (PPCM) was prepared by vacuum adsorption method with expanded perlite as adsorption material and paraffin as phase change energy-storage material. The diffused-exudative circle method was used to determine that the best adsorption quantity of expanded perlite was 65%. The phase transition process and microstructure of PPCM with the best adsorption quantity were characterized by DSC and SEM. The results shown that the internal micropores of expanded perlite particles were almost completely filled with paraffin and the expanded perlite particles became close-grained particles. The phase change temperature of PPCM was basically similar with that of paraffin and its phase change latent heat was corresponded with that of paraffin in the PPCM.
Study on Building Wall Materials System by Using Association Rule Mining
Authors: Xu Hong Sheng , Tan Qing , Li Chao
Published: June 2013

Association rule mining is to find interesting associations between itemsets in large amounts of data or related links. The new wall materials are mainly concrete, cement or fly ash, coal gangue and other industrial waste and household garbage produced by the non-clay brick, building blocks and building boards and construction techniques, materials, technology, detection means there is no specification limit. This paper presents the using association rule mining to build the building wall materials system. Experimental data sets prove that the proposed algorithm is effective and reasonable.
Simulation on Computational Fluid Dynamics of Flow Field and Pollutant Dispersion in Block of Buildings
Authors: Huang Rong , Li Kai Hua , Wang Bo
Published: June 2013

With the social development, motor vehicle exhaust has become a major source of pollution in the city today, so it is necessary to research the effect of the wind field around buildings and pollutants dispersion on human health. In this paper, we using Fluid Dynamics method to simulate the pollutants dispersion under different wind direction. The results showed that the maximum wind speed of the buildings in the same horizontal plane appeared in the entrance of the street. When the inflow velocity, wind directions are different, the air flow distribution is different in group of buildings. Pollutants are prone to accumulate in the place of low wind speed, atmospheric instability, and weak turbulence intensity. The concentration of pollutants from lower to upper gradually reduced, but it will appear opposite situation in the vortex.
The Effects of Swimmers Posture and Swimsuit on the Hydrodynamic Performance during Underwater Swimming
Authors: Chen Zhi Feng , Fang Hai Sheng , Tian Jun
Published: June 2013

Computational calculation is conducted to evaluate the effects of the swimmers posture and swimsuit on the hydrodynamic performance using the Fluent code. Both steady and unsteady models are applied on a 2D geometry. It is found that the swimmers posture and swimsuit play an important role on the hydrodynamic performance. The unsteady modeling reveals the vortex formation, development and separation behind the feet, and predicts the variation of the forces on the swimmer by time. The results provide a basis theoretically for the swimmer to understand the effects of posture and swimsuit on the resistive force, and then to provide tools for the optimization of underwater swimming.
Analysis of Torsion Vibration with Safety Navigation Countermeasures under the Condition of Rough Seas and Storms
Authors: Liu Xing Bo , Ai Wan Zheng
Published: June 2013

Rough seas can bring adversely affects to ships safety navigation. Adversely affects on ship torsion vibration caused by rough seas is analyzed, and measures to decrease these adversely affects is also put forward as to provide references for seaman in this paper.
Prestressed Modal Analysis of the Wind Turbine Rotor Based on ANSYS Workbench
Authors: Xu Zhi Qiang
Published: June 2013

The high speed rotating prestress makes wind turbine blades produce the dynamic stiffening effect, which has great influence on the strength of the blade and the resonance frequency. The geometric model of the rotor is established in the 3D drawing software. Based on the finite element software, the meshing, the algorithm selection and material properties are discussed respectively. The modal simulation results of the prestressed condition and no prestress state are compared. The dynamic stiffening effect increases the blade original natural frequency.
The Preparation and Performance Research of the Desulphurization Gypsum Plaster Material
Authors: Zhao Huan Qi , Li Guo Zhong
Published: June 2013

The cementing material is the desulfurization gypsum. The fly ash is a admixture. A moderate amount of additive is mixed. A gypsum plaster material of micro swelling and good workability, plasticity was produced. The representative two retarders, the sodium hexametaphosphate and the citric acid, were researched. The effects of the retarders on the setting times and the mechanical properties of the desulfurization gypsum were studied. The retarding effect of the citric acid is the most prominent, but its negative impact on the flexural and compressive strength of the plaster gypsum is very large. Considering the setting time and the strength, the sodium hexametaphosphate is the best retarder of the desulfurization gypsum plaster material.
The Study of the Red Mud Foam Lightweight Insulation Materials
Authors: Ma Long , Li Guo Zhong
Published: June 2013

Red mud foam lightweight insulation material was prepared by using red mud, fly ash, coal gangue and so on as raw materials by the method of foaming and sintering process. Influences of sintering temperature on thermal insulation material properties were studied. The micro-structure of samples was characterized by scanning electron microscopy (SEM) and mechanism analysis was made. The results show that in this condition, the optimum sintering temperature is 1120°C. The flexural strength of the samples is 0.41MPa, the compressive strength is 1.15MPa and the density is 479kg/m3.
Properties of Vanillin Modified Poly(vinyl Alcohol)/Gelatin Composite
Authors: Cheng Lin , Zou Qin , Zou Li Kou , Luo Yan , Kan Li Qiang , Li Yu Bao
Published: June 2013

To improve the cytocompatibility of super-hydrophilic poly (vinyl alcohol) (PVA) hydrogel, PVA/gelatin (PVA/Gel) composite was modified by vanillin (PVA/Gel/V) in this study. The properties of the composite gels were characterized by SEM, FTIR, DSC and contact angle instrument. The results show that PVA/Gel/V composite can compose a homogeneous system with the addition of vanillin, accompanying some destroy of the intra-hydrogen bonding of PVA crystal molecular chains and decrease of PVA super hydrophilicity. PVA/Gel/V composite exhibits better miscibility and hydrophobicity than pure PVA and PVA/Gel. The modified PVA/Gel/V composite may have a promising prospect for future cartilage repair.
Synthesis and Microwave Absorption Characteristics of Polyaniline
Authors: Li Ding Guo , Lu Wen Hua , Chen Cong , Rao Wei , Xiong Yong Hong
Published: June 2013

This paper aims at reporting the synthesis and microwave absorption characteristics of polyaniline (PANI). The PANI nanoparticles were synthesized by chemical oxidative polymerization method with ammonium persulfate ((NH4)2S2O8, APS) as oxidant and hydrochloric acid (HCl) for protonation of aniline. For APS/aniline mol ratio of 1, HCl concentration of 1 mol/L, reaction temperature of 5°C, the reaction time of 6h, the obtained PANI exhibits the highest value（30.9 S·cm-1）of the electrical conductivity. The structure and morphology of PANI were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrophotometer (FT-IR), ultraviolet-visible spectrophotometer (UV-Vis) analysis ways. Microwave absorbing performances were investigated using wave-guide method with vector network analyzer in 2–18 GHz. The results showed that there is a maximum absorption peak with RL= -12.63dB at 13.61GHz，the value of RL ≤−10 dB is maintained from 11.38GHz to 18GHz for the sample of the thickness for 2mm.
The Simulation of Photocatalysis Degradation of Formaldehyde Using Nano-TiO2 Based on the Diffusion Model
Authors: Li Bin , Zhang Kai Xiao , Feng Chao Yu , Zheng Xing Bin , Xie Kun , Li Yue
Published: June 2013

In this paper, the one-dimensional diffusion model about nano-TiO2 photocatalytic degradation of formaldehyde process was established ,through analyzing nano-TiO2 photocatalytic mechanism, and verifying the accuracy of the model by the experimental data combined with Fick's law. According to this model, it concluded that the degradation rate of the formaldehyde is related to the height of purification apparatus, and when the height is smaller, the degradation rate is greater. Within the same cleaning time (t = 200min), when the height is 0.15m, the rate of degradation of formaldehyde is 99%; when the height is 0.3m, the rate of degradation of formaldehyde is 88%; while the height is 0.7m , the rate is only 32%.