bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved Apriori Algorithm in the Power System Fault
Authors: Lin Li Qiang , Yan Hong Wen
Published: May 2014

For the low efficiency in generating candidate item sets of apriori algorithm, this paper presents a method based on property division to improve generating candidate item sets. Comparing the improved apriori algorithm with the other algorithm and the improved algorithm is applied to the power system accident cases in extreme climate. The experiment results show that the improved algorithm significantly improves the time efficiency of generating candidate item sets. And it can find the association rules among time, space, disasters and fault facilities in the power system accident cases in extreme climate. That is very useful in power system fault analysis.
Design and Implementation of a Compact Integrated Navigation System for Micro Multi-Propeller Multifunction Aerial Robots
Authors: Zha Chang Liu , Ding Xi Lun , Yu Yu Shu , Wang Xue Qiang
Published: May 2014

Micro Multi-propeller Multifunction Aerial Robot (MMAR) needs a low-cost, small-size, low-power and lightweight navigation system. To meet these requirements, a compact navigation system for micro MMARs is designed and implemented. The system consists of a GPS receiver, a MEMS inertial measurement unit (IMU), a barometer, a magnetometer and a dual microprocessors navigation processing platform. According to the characteristics of the sensors used, the optimized Kalman Filter (KF) is designed to implement the navigation data fusion with less computational cost. The test results show that the system’s small size, low power consumption, light weight and better dynamic accuracy can meet the requirements of micro MMAR autonomous flight.
Research of Chip Placement and Routing Algorithms for Board-Level Photoelectric Interconnection
Authors: Liu Jian , Wu Zhao Hua
Published: May 2014

This document improved genetic algorithm and Intelligent discern points algorithmin chip placement and routing for Board-level photoelectric interconnection, by comparisonofthe algorithm results to verify the effectiveness and practicality of the improved algorithm. First introduced the features of chip placement and routing for Board-level Photoelectric Interconnection. Then describes the improved method of genetic algorithms and intelligent discern points algorithms. Finally, implement algorithm by C language on VC6.0++ platform, while the data import MATLAB to displays the optimal placement and routing results. The results show that the effectiveness of improved algorithm, which has a guiding significance for the chip placement and routing.
Effectiveness of an Inorganic Corrosion Inhibitor in Pore Solution Containing Sodium Chloride
Authors: Feng Xing Guo , Dong Guang Hui , Fan Jun Yan
Published: May 2014

Combining use electrochemical measurement and weight loss testing, the inhibition efficiency of an organic inhibitor was studied in a chloride contaminated solution. The results showed that the added inhibitor can enhance the corrosion potential and decreased the corrosion current density of rebar. The weight loss testing confirmed that the inhibitor reduced the corrosion rate of rebar by 80% in the chloride containing solution. Moreover, the linear polarization results are consistent with the weight loss testing, which suggests that the former is an effective method to estimate the inhibition efficiency of inhibitors.
Behavior of Electric Vehicles Charging and Discharging and Impact on the Grid
Authors: Song Shao Jian , Wang Xiao Han
Published: May 2014

With the promotion of our country policy about electric vehicles, the development conditions of electric vehicles are improving day by day. However, the application of large-scale electric vehicles will have a direct impact on the power grid. Guilin is taken as an example to analysis the impact of models including uncontrolled charging, controlled charging and controlled charging/discharging model in different scales on the power grid using the Monte Carlo algorithm. The simulation results show that the proper number of electric vehicles involved in the controlled charging/discharging model can effectively achieve the target of peak clipping and valley filling. However, after more than a certain number, it will bring new pressure to the power grid.
Multi-Group of Dual-Frequency Pulse Waveform Design for Anti-Range Eclipse of High PRF PD Guidance Radar
Authors: Zhao Bin , Wang Zhao Fa
Published: May 2014

Range eclipse is a serious problem in high pulse repetition frequency (PRF) pulse doppler (PD) terminal guidance radar. In this paper, we propose a new scheme, which exploits multi-group of dual-frequency pulse waveform, for anti-range eclipse. Each group contains two pulse waveforms with different PRF, which has its own range region of anti-range eclipse and anti-range ambiguity simultaneously. In the scheme, only one pulse group works at a moment, which can avoid range eclipse and effectively measure target distance. According to the changing of target distance, radar switches the pulse group to other group to guarantee target in the range region of no eclipse in the tracking term. Simulation results show that this method can effectively prevent high PRF PD radar seeker from range eclipse.
Research on Unequal Grouping of Parallel Compensation Capacity in Substation
Authors: Cao Shan , Ji Yu Qi , Geng Guang Fei
Published: May 2014

For the problem of unequal grouping of parallel compensation capacity in substation, this paper proposes a new optimization method based on curve segmentation and clustering. Firstly, calculate reactive power demand curve by transformer parameters and load curve, partition this curve into several segments. Then cluster these segmentation results into K clusters by using modified FCM (fuzzy C-means clustering) algorithm, in which K means the number of capacitor groups. Take the difference between two adjacent cluster centers as the capacity of each group. Furthermore, study the relationship between segment number and grouping centers in order to get the steady grouping results. After the grouping plan is determined, take the nine-area figure as control strategy. Finally, simulating with an equivalent practical power grid and load profile, the results show both the availability and rationality of this method that power loss is less and power factor is higher compared with the equal grouping method when capacitor is divided into 3 groups.
Research of Photovoltaic Charging System with Maximum Power Point Tracking Based on DSP
Authors: Zhao Yi Zhi , Liu Qian , Zhang Qi
Published: May 2014

According to the output characteristics of photovoltaic (PV) array and battery charging characteristics, this article used DSP to design a PV charging system with maximum power point tracking (MPPT) ,and the three-state charging method was implemented on it. The incremental conductance (INC) algorithm was applied in fast-charge stage to track maximum power point. PI regulator algorithm was exploited to realize constant voltage charge in the stage of over-charge and float-charge, and the charge voltage was compensated by the sampling temperature. Experimental and simulation results indicated that this method can be used to improve the energy efficiency of PV cell, and extend the lifetime of battery.
Study on Density Functional Theory of Zn1-xMgxO Alloy
Authors: Zhang Fu Chun , Cui Hong Wei , Ruan Xing Xiang , Zhang Wei Hu
Published: May 2014

Geometric structure and electronic structures of Zn1-xMgxO alloy under different Mg doped concentrations have been investigated by performing the first-principle calculations based on density functional theory under the generalized gradient approximation (GGA). The calculated results show that there is substantial change in electronic structure of Mg doped MgxZn1-xO alloy, with the constant increase of Mg content, cell parameter a shall be on the gradual increase, with c on gradual decrease and band gap width of MgxZn1-xO alloy on the increase. The research findings show that the position of conduction band bottom is dependent on Mg 2p and Zn 4s. Mg doping results in drift of Mg 2p and Zn 4s toward high energy region, being the root cause for the increase in band gap width,the research results in the paper are in accordance with other experimental results. The above results provide theoretical guidance to the preparation of Zn1-xMgxO alloy in experiment.
Research of Harmonic Reuse by Fundamental Resonant Method
Authors: Yao Yu Qin , Wang Wen Bin
Published: May 2014

A new method to store the harmonic energy is proposed, by offering harmonic energy to DC load directly by combining the diode’s one-way electric conduction theory with the first-harmonic resonance theory. Using the PSCAD/EMTDC software to simulate the project in single phase and three phases. And it turn out that the theory is feasible.
Research of Stabilization of Voltage in Substation Based on SVC in TCR and FC Mode
Authors: Tan Xiao Long , Zhou Jia , Wang Wen Bin
Published: May 2014

Recently, SVC and STATCOM have gotten a very quick development because they can be triggered dynamically and have feedback module so that they can inspects the vacancy of the Var and compensate it quickly and dynamically. In this paper, the stabilization of voltage in substation based on SVC in TCR and FC mode has been discussed.
Design of a Magnetic Gradient Coil with High Uniformity
Authors: Jin Duo , Cheng De Fu , Wang Yan Zhang
Published: May 2014

Maxwell coil cannot meet the magnetic sensor calibration when the high uniformity of magnetic gradient is required and the space size is strictly limited. To solve this problem, a magnetic gradient coil with high uniformity was designed as magnetic sensor calibration device. Application of internal series method analyzed the magnetic field that a single axial symmetric coil generated, and then got the general characteristics of the magnetic gradient field distribution. On this basis, the structural parameters and the uniformity of magnetic gradient coil with high uniformity were calculated. Simulation analyses were carried out on the coil model and complete the design and production of magnetic gradient coil device. Finally, the data obtained from actual measurement and simulation proves the correctness of the design.
Design and Simulation of Breaking Time Sequence for DC Circuit Breaker with a Current-Limiting Inductance
Authors: Wei Si Ming , Zhang Yi Gong , Liu Huan , Dai Zhi Qiang , Du Xiao
Published: May 2014

It is great significance for development of MTDC (Multi-terminal HVDC) to build DC transmission and distribution grids. However, the relatively low impedance in DC grids makes the fault penetration much faster and deeper .Consequently, fast and reliable DC circuit breaker is needed to isolate faults. Breaking time and other parameters are important for a breaker to achieve its goals. This paper presents a DC circuit breaker with a current-limiting inductance and gets the rising and falling characteristics of fault current. Based on the characteristics, a design method of breaking time sequence will be given, as well as the calculation of current-limiting inductance and the selection principles of arresters. A 10kV DC distribution grid is modeled and simulated by PSCAD/EMTDC to verify that the method can meet the requirements of breaking fault current quickly and reliably.
Design of Program about the LED Digital Clock Based on Atmega16 Microcontroller and DS1302
Authors: Zhang Ming Chang
Published: May 2014

Clock is used to enregistering the time and the real-time data collection in the life and the system of the automatic control. The main working principle of DS1302 and programming sought are introduced on the software design. Finally, the system software interactive simulation was completed on the platform of Proteus.
Flotation Test of High Sulfur Copper Ore in the Northwest in Yunnan
Authors: Zhang Zhi Guo , Liu Quan Jun , Ran Jin Cheng
Published: May 2014

The experimental ore belongs to a kind of typical high sulfur ore,which makes it to be a refractory ore.The copper in the ore has a relative high grade which comprehensively reaches 3.78% ,with the chalcopyrite occurs the main form.After a serious of condition tests,a final flowsheet with once roughing,twice cleaning and twice scavenger is determined.Through a closed-circuit,it could obtain copper concentrate with grade of 20.91% and recovery of 91.61%
Simulation of Tracking Control Modeling of the Photovoltaic System with Maximum Power
Authors: Xie Pu , Hu Wen Lei , Liu Zheng Chun
Published: May 2014

This paper mainly studies the off grid wind solar hybrid power supply system based on the DC bus, a practical mathematical model, implemented in MATLAB software on the system modeling and simulation. Through controlling the light intensity, temperature and other environmental parameters, operating characteristics of the system, analysis of system output voltage (current), dynamic and steady-state output power parameters. On the basis of the maximum power point tracking (MPPT) problem, and the maximum power point of PV power generation system tracking (MPPT) in-depth simulation experiments, using variable step perturbation and observation method, and the corresponding simulation model is established in MATLAB, changes in the environment variable parameters of the system can make timely adjustment re operation, in the vicinity of the maximum power point, and the work efficiency and the operating characteristics of the system through the analysis of the problem.
Dual-Current Loops Control Strategy of PWM Rectifier under Unbalanced Grid Voltage Conditions
Authors: Ni Yi Feng , Zhu Yong Qiang
Published: May 2014

The unbalanced grid voltage causes the current harmonics, the fluctuation of the active power in AC side and the fluctuation of the DC voltage. The dual-current loops control strategy can slove those problems. The positive and negative sequence components of grid voltages and currents were calculated based on the symmetrical component method and were used to calculate the instantaneous power in double dq rotate coordinate, which ratate at positive and negative synchronous angular velocity respectively. The dual-current loops control strategy was finally verified in simulation by comparing with the conventional synchronous PI current control. The simulation results show the dual-current loops control strategy is effective on eliminating the fluctuation of the active power in AC side and the fluctuation of the DC voltage.
The Study on 45KW Range Extended Electric Vehicle Auxiliary Power Unit
Authors: Guo Yun Long , Wang Xu Dong , Long Jiang
Published: May 2014

Range Extended Electric Vehicle (REEV) is a vehicle in smooth transition to pure electric vehicle. According to the functional analysis to REEV, propose the overall design of auxiliary power unit, develop an APU control system. This control system is based on infineon XC164CS Single Chip Microcomputer, use modular method, design and develops the data acquisition module, IGBT driver module, CAN communication module and conducts bench experiment to the system. The bench testing shows the system has high sampling precision, fast speed, good stability and easy to debug. Basic APU strategy control plan is designed to ensure electricity generation with first constant current, then constant voltage work mode, and can perform the fault diagnosis function, meet practical requirements, and achieve the expected control purpose.
Dark Current Model of Quantum Dot Infrared Photodetectors Based on the Influence of the Drift Velocity of the Electrons
Authors: Liu Hong Mei , Yang Chun Hua , Shi Yun Long
Published: May 2014

Quantum dot infrared photodetectors (QDIPs) have already attracted more and more attention in recent years due to its superior performance. In this paper, a model for the dark current of the QDIP is built. This model supposes that the dark current in the potential barriers is equal to the dark current of the total device according to the structure of the QDIP, and the total electrons transport, the drift velocity and the mobility dependences on the electric field are also taken into account. The corresponding results show the correctness and the validity of the dark current model.
Fault Diagnosis of Analog Circuits Based on Evidence Theory
Authors: Cheng Cheng
Published: May 2014

BP neural network and evidence theory data fusion technology can be used in troubleshooting electronic equipment, from the simulation results show that the fault diagnosis method based on evidence theory and BP neural network can effectively diagnose faults in analog circuit, and it has automated intelligent characteristics.
Design of Metamaterials 340GHz Polarizing Converter
Authors: Liu Chi , Wang Xue Tian , Deng Jun
Published: May 2014

Nowadays, with the development of the high frequency and short wave radar system, the facilities are becoming more and more precision. This paper shows a very important part of the 340GHz radar system, which is the design of polarizing converter in the transceiver isolation network. Because of the big limit in the systemic error of the quasi-optical polarizing converter which is based on the principle of orthogonal polarizing isolation, here we use the latest technology – Metamaterials, to design the polarizing converter depending on its anisotropic property. Finally we find that the result of the periodicity polarization in 340GHz is good.
The Measurable Device of Even Voltage on the Basis of Single Chip Micro Compute
Authors: Gao Ying , Liu Bai Fen
Published: May 2014

At present, the ability tolerated voltage of single component is limited, so on some occasions, it can’t meet the demand of tolerated voltage of electrical equipment and thus we must make many components in series to enhance the ability of tolerating voltage.When the components of withstand voltage are used in series, we always hope every component can load the voltage equably. Because the character of component of withstand voltage is in random, even the components which are used in series are the same type, this circumstance that every component can’t load the voltage equably also can appear. Even in case one of component is damaged, it can trigger a chain reaction which results in the rest also are damaged. The purpose of research about this topic is to design a measurable device which can judge the voltage whether is equably distributed on every component in series or not on the basis of single chip microcomputer. By exerting a high voltage on many components of withstand voltage in series, then measure the voltage on every component to judge the components whether have a good effect for loading voltage equably, according to this judgment to choose the components which can load voltage equably .
Transformer Excitation Characteristics Research under DC Bias
Authors: Hu Yang , Li Hui Qi
Published: May 2014

Solar storms and power engineering HVDC, make the earth there geomagnetic induced current and direct current. If the DC current into the neutral grounding transformer, the transformer will be caused bias magnetic phenomena, changing its excitation characteristics, interfere with the normal operation of power systems and equipment. This paper considers the impact on the excitation characteristics of hysteresis effects, establishing excitation characteristics calculation model, proposes an improved graphics corresponding method to calculate and analyze the open circuit excitation characteristics of single-phase transformer in three columns under DC bias, the experimental results prove the validity of the proposed method.
Design of Swimming Pool Temperature Dot Matrix Screen Display
Authors: Yang Xue Feng
Published: May 2014

According to the need of the real-time monitoring and displaying of the environment in many areas,to put forward a method of temperature monitoring and displaying, using STC11F32XE microcontroller as the core controller, DS18B20 as temperature acquisition chip, 32X64LED dot matrix screen as a display screen,using the mothod of multi point detection method,real-time monitoring of swimming pool water temperature and room temperature, real-time displaying of Multipoint collecting information, Real time processing the detected temperature, the page display to multipoint temperature display through the wireless remote control module,the system will alarm When the water temperature is too high or too low, to remind managers of real-time processing.To design a clear temperature display for the swimming pool,real time monitoring and controlling is very convenient,after the experimental verification, the system reaches the anticipative goal,the system is an ideal and effective.
Ultrasound-Pulse Electrodeposition Preparation of Fe-Nano ZrO2 Functional Gradient Coating
Authors: Yan Shuai , Wu Meng Hua , Ning Zhi , Wang Yuan Gang
Published: May 2014

Objective On the basis of the experimental investigation of Fe-ZrO2nanocomposite coating, nanoZrO2particles were added to the bath to prepare the nanocomposite coating of Fe-ZrO2with electroplating methods and laser cladding. Methods Study the effects of nanocontent, cathodic pulse current density, duty cycle, the ultrasonic frequency content of the coating surface Nano, orthogonal optimization of process parameters. Results The results show that nanoparticles concentration 10 g/l, the cathode current density pulse 4A/dm2, the duty cycle 20%, ultrasonic frequency 180W, nanocomposite coating capacity of up to 5.5wt%. Conclusion Fe-ZrO2nanocomposite coating improved abrasion and Corrosion of the binary composite coating.
Automatic System Design for Cheque Discrimination Based on OCR Technique
Authors: Li Jie , Yang Yu Rui
Published: May 2014

Aiming at how to solve the problem of cheque image discrimination quickly and accurately,an automatic system for cheque discrimination by using Optical Character Recgnition (OCR) technique based on the features of a cheque image was designed and developed, the main functional modules and key technologies of the system were studied, and all the functional modules were organized in a good logic way,finally, the automatic system for cheque discrimination was intergratted. The results of the experimental tests showed that the system can identify the information of one cheque quickly and accurate, the discrimination results were good.
Correlation between Clinicopathology and Expression of Heat Shock Protein 72 in Human Hepatocellular Carcinoma
Authors: Fang Yan , Wang Xiao Ping , Lin Huan Ping , Xu Bing , Fang Jing Gang , Zhang Ke Pei , Yang Yi Xin
Published: May 2014

Heat shock protein 72 (HSP72) is highly expressed in cancer tissues. Recent studies indicate the possible roles of HSP72 in the development and progression of hepatocellular carcinomas but detailed information is still ambiguous. The aim of the study is to investigate the correlation between clinicopathology and immunolocalization of HSP72 in human hepatocellular carcinoma. Immunohistochemistry demonstrated that HSP72 expression in hepatocellular carcinomas with metastasis was significantly higher than those with non-metastasis. HSP72 expression was significantly associated with the presence of tumor infiltration, lymph node and remote metastasis.
The Remote PLC Control System Based on the Embedded Web Server
Authors: Xu Shu Ping , Li Jun , Zhao Yu Feng
Published: May 2014

Since the resource of the sever in embedded remote control system is limited, an approach is presented which use CGI and XML technology to realize remote monitoring computer and embedded Web server for dynamic interaction. Combined with the basic requirements of embedded remote control system, the idea of component design is proposed, the major components of system functions are defined. According to the system functional requirement, the software is designed and realized. The practice prove , the scheme realize the remote control of the transmitter by the small cost . And the system is convenient and safe. The definite reference value is offered to the offspring complex remote control system.
Virtual Coupling Based Control Methodology for Lower Extremity Exoskeleton
Authors: Cui Jin Xiang , Zhu Yan He , Xu Ben Zhou
Published: May 2014

As one of the most important examples of human-orientated system, the exoskeleton can improve the strength and endurance of the wearer. The exoskeleton has multi-degrees of freedom. As a result, a stable controller for the exoskeleton is difficult to design. The adoption of a purely positional control strategy may lead to large contact forces. Hence, an admittance control strategy is devised aimed at limiting both internal and contact forces. To verify the rationality and feasibility of the control strategy, we introduce a method utilizing virtual prototype and collaborative simulation.
Design and Analysis of a New Type of Spherical Robot
Authors: Bai Jie , Dang Jian Jun
Published: May 2014

A new type of spherical robot based on the concept of changing the barycenter of the system is presented. The robot is consist of a shell and inner driving unit inside. The driving motor can provide the torque to move forward and backward, and the other motor can control the movement of a slider which is used to change the barycenter when turning the direction. The whole system is easy to design and the plate inside can be installed with certain sensor for special tasks. The dynamic model of the robot is introduced. The simulation results which shows the accordance with the experiment is presented.
Adaptive Fuzzy Controller Design Based on Aircraft Model
Authors: Li Yu Qing , Lei Chong
Published: May 2014

According to the attitude control equation and the equations of fluid mechanics, build dynamic model .The system simulation method and the MATLAB software were used to study on the aircraft model for several different controller system, which including PID controller, T-S fuzzy controller, The adaptive fuzzy controller design. Analysis of interference signals on the performance of the aircraft control system, consider the overshoot, steady-state error, resistance to load disturbance and parameter changes adaptability, robustness. Finally, It is concluded that different controller of vehicle performance index, and then analysis from the advantages of adaptive fuzzy control in the aspect of aircraft model.
The Technology Research of State Observer Design for Second-Order Control System
Authors: Li Yi Ming
Published: May 2014

For any second-order system, so long as it can be proved that it can be controlled and observed, it can proceed to the design of the observer. The article selects any second-order system, and the first the paper writes the block diagram of transfer function, and proves its controllability and observability, and then carries pole assignment with it. Finally the article designs the observer for the system. Through the simulation software can prove that the second-order system becomes into the stable system from the unstable system through the design of observer.
Effect of Overaging Temperature on the Mechanical Properties of Ultra-High Strength Multiphase Steel
Authors: Li Zhuang , Zheng Zhen , Qiu Da Tong , Guo Li Zhe , Gao Xin , Yu Tao , Li Zhao Hua
Published: May 2014

Overaging after intercritical annealing of ultra-high strength multiphase steel was conducted in a continuous annealing simulator of the laboratory. The effect of overaging temperature on the mechanical properties of multiphase steel has been studied by observing the microstructural evolution during overaging. The results have shown that multiphase microstructures containing ferrite, martensite, bainite and retained austenite were obtained by overaging treatments after intercritical annealing in ultra-high strength steel, and overaging temperatures affected all constituents of the microstructure. UTS and YS dereased with increasing overaging temperature, and TEL decreased after overaging at 350°C. A good combination of ultimate tensile strength (1400MPa), yield strength (795MPa), and total elongation (15%) was exhibited for the specimen overaged at 250°C. This was attributed to synthetic action of all constituents of ultra-high strength steel microstructure.
Unknown Environment Mapping Based on Multiple Micro-Robots
Authors: Zhang Wen Zhao , Liu Zhi Zhuang , Zhou Wen Zhen
Published: May 2014

Currently, most mapping researches are deeply dependent on long range sensors such as sonar, laser range finders or cameras, but due to power or cost constraints, which often cannot be mounted in the sensor module. In response to the no long range sensors situation, this paper presents a method to complete indoor mapping tasks in real-time only using short range sensors installed on the multiple micro-robots. The key mapping problem needed to address in the paper is that each single robot created a map based on odometer and short distance sensor data, and then maps from multiple robots were consolidated to generate a greater coherence map. A kind of SRV mobile robots were tested in an artificial rectangular environment. The experimental results show that the multiple micro-robot system has good robustness to odometer and environmental noise.
Design of Automatic Test Platform for the Gyroscope Group Based on Pertinence Matrix
Authors: Li He Jia , Wang Xue , Xu Hai Feng , Yao Cheng , Gao Wen Ju , Wang Hui
Published: May 2014

Aiming the problem of the armored vehicle's gun control system that there are many kinds of internal devices, complex fault reasons ,but no all-around and online fault diagnosis and state inspection mean, The automatic test platform for the gyroscope group with performance test and fault diagnosis for component and circuit is designed .The platform based on dependency matrix and optimal criterion of the maximum failure feature information entropy optimize test points ,choose optimal test points design. Performance test module is created and provides test result information for fault dictionary in fault diagnosis module. Automatic test platform is able to locate the circuit component failure.The platform is tested by actual vehicle experiment, and the results prove the reliability and validity of the platform.
Transformer Winding Deformation Diagnosis by Induced Voltage Test
Authors: Wen Ding Jun , Lv Jing Shun , Zhang Xiu Bin , Hu Chun Jiang
Published: May 2014

During induction voltage test, the changes of data such as output voltage and output current reflects the changes of the equivalent parameters of the transformer. Through the analysis of testing data, diagnosis of winding deformation of the transformer can be made. Transformer condition evaluation can be provided on the basis of these data. In this paper, induction voltage test data is analyzed after a transformer tripping. Winding deformation of the transformer is judged. Relevance judgment is confirmed by disassembling inspection.
A Long Term Integration Method Based Velocity Template Detector for Dim Targets
Authors: Guo Ming Ming , Deng Xiao Bo
Published: May 2014

This report investigates a segment treatment method of long term integration. In this paper, the authors design a velocity template detector (VTD) which is combined with the hybrid coherent-incoherent integration to detect radar dim targets. Unlike most of the existing long term integration methods which are complex-algorithm and huge-computation, the proposed method is simple and easy to achieve, which is of great practical significance.
Kinetic Study for Biosorption of Cr (VI) from Aqueous Solution by Aspergillus niger
Authors: Zhang Li Fang , Jiang Chun Yang , Shao Zhao
Published: May 2014

In this study, Biosorption of Cr (VI) ions from aqueous solution by using biomass of Aspergillus niger was investigated. The effects of initial solution pH, biosorbent amount, contact time, initial concentration and temperature were explored. In batch experiments, the biosorption capacity of Cr (VI) decreased with increase in solution pH. The biosorption of Cr (VI) ions with pH range of 2.0-8.0 was found to be optimal at pH 2. Biosorption capacity of Cr (VI) ions decreased with increased biosorbent dosage. The bosorption capacity was increased with the increasing initial Cr (VI) concentration and temperature in studied range. The biosorption process followed the pseudo-second order kinetic model and the correlation coefficients from the pseudo-second order model were all higher than 0.9997 in all studied temperatures. These results suggest that the biomass of Aspergillus niger is a promising biosorbent for removal of Cr (VI) ions from the wastewater.
A Fault Diagnosis Method for In-Orbit Satellite Based on Credibility and Degree of Membership
Authors: Qin Wei , Han Hong Bo , Yan Ling Wei , Guo Yi Qi
Published: May 2014

The mistake rate of in-orbit satellite diagnosis reasoning is a problem which is difficult to solve because of the complex technique frame of satellite and the bit errors of telemetry data. This paper proposed a diagnosis reasoning method based on credibility and degree of membership. And the credibility passing algorithm and the membership function prototype were given to support the diagnosis reasoning process. The argumentation indicates that the diagnosis reasoning mistake rate can be reduced with this method.
Simulation on Optimized Intrusion Detection of Multi-Layer, Distributed and Large Differences Database
Authors: Wang Nuo , Li Yan , Yuan Li Min
Published: May 2014

Different from the traditional single databases, there is a big difference between different layers’ data of multi-level database. The differentiation of categorical attributes is small. Traditional database intrusion detection process is simply to consider the point to point data detection between the layers, without considering the similarity between the layers and ignoring the optimization for detected properties of the applied classification between the levels, resulting in lower detection accuracy. In order to avoid the above-mentioned defects of the conventional algorithm, this paper propos an intrusion detection model of multi-layered network by introducing the coarse-to-fine concept. The intrusion feature of computer database is extracted to be used as the basis for intrusion detection of database. The particle swarm distinguish tree is established to make the hierarchical processing for nodes. Through the probability operation of database intrusion detection in different layers, intrusion detection of multi-layer, distributed and large differences database can be achieved. Experimental results show that the use of the intrusion detection algorithm for multi-layer, distributed and large differences database, can increase the security of the database, ensure the safe operation of the database.
Design and Creation of the Automatic Data Testing Tools for Smart Sensor Based on CAN Bus
Authors: Qian Wei Kang , Zheng Xiao Lin
Published: May 2014

As the purpose of environmental protection, NOxsensor is driven to develop. It is built to detect the concentration of nitrogen oxides in the exhaust emissions of motor vehicles. During the development of sensor, the automatic test for the sensor ́s output message is a significant procedure. This article is aimed to design a user friendly test tool based on LabVIEW for real time testing, evaluating and error detecting of sensor data transmitted via CAN bus. Controller area network (CAN) is one of the most widely and frequently used communication protocols in automotive applications. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) is a system-design platform and development environment for a visual programming language from National Instruments. NI Company provides flexible and diverse CAN bus interface hardware and software drivers which is useful and necessary for building an automatic test system. It contains the features of configuration, displaying and decoding CAN data frames, checking CAN bus errors, testing and evaluating decoded messages, report generation, signal setting and validation.
Greenhouse Monitoring System Based on ZigBee and GPRS
Authors: Han Xiao Xia
Published: May 2014

In order to reduce costs and improve crop yields effectively, a greenhouse environment monitoring system based on ZigBee and GPRS technology is designed. In the system, ZigBee wireless sensor module is used for data acquisition of soil moisture, precipitation, nitrogen concentration, temperature and barometric pressure data etc. The information is sent to a remote monitoring center through GPRS, Instructions is regulated and take corresponding measures according to the received information. The system can collect and monitor the parameters of the greenhouse environment at a real time. This has important implications for the development of agriculture automation and agricultural production levels.
Research on EIS-Based Anomaly Detection Technique for Composite Materials
Authors: Sun Chao , Dong En Sheng , Li Yong Heng , Zhu Bing
Published: May 2014

The application of advanced composite materials in airplane is becoming more and more. Along with the increase of its service time, it may be abnormal. It needs to take an anomaly detection. The electrical impedance spectroscopy (EIS) is applied to the anomaly detection of composite material components in airplane. A uniplanar sensor with double-electrode and two carbon fiber composite samples are made, an experiment circuit is designed. In order to verify the effectiveness of the experimental circuit, the EIS of the Randles unit model circuit is measured, as well as the two composite material samples using the dual-electrode measurement method. The picture of EIS is drawn in Matlab and comparison and analysis are carried out. The preliminary experimental results indicate that the anomalies can be seen by measuring the EIS of the composite materials. It is feasible for the EIS to be applied in the anomaly detection of the composite materials in airplane.
The Structures and Melting Properties of the Al-W Mixed Clusters
Authors: Sun Jing Wei
Published: May 2014

Through the classical molecular dynamics, the melting properties of the the tungsten and aluminum mixed clusters are explored. By using simulated annealing the structure of the mixed cluster is obtained. It is found that the Al atoms tend to locate on the surface of the clusters. The melting behaviors of the clusters are analyzed in detail by the atom-resolved Lindemann index. The curves of Lindemann index show that the melting process of the can experience three steps which is not common in the melting process of the nanoclusters.
Microwave Dielectric Properties of Ca[(Li1/3Nb2/3)0.92Zr0.08]O3−δ Ceramics with Glass Addition
Authors: Xiong Gang
Published: May 2014

The effects of ZnO-B2O3-Na2O(ZBN) glass on the sinterability and microwave dielectric properties of Ca [(Li1/3Nb2/3)0.92Zr0.08]O3−δ −0.05TiO2 ceramics were investigated . ZBN glass doping can effectively reduce sintering temperatue by 100~150oC. The temperature coefficient of resonator frequency τf increased with an increase of ZBN glass content and sintering temperatue. When ZBN glass of 1.8wt% were added, the optimum microwave dielectric properties: εr=32.8, Qf =13420GHz and τf= − 4.3×10−6/oC were obtained at the sintering temperature of 1000oC.
Calibration Sources Optimization in Passive Location Systems Using Differential Calibration with TDOA and FDOA Measurements
Authors: Zhang Li , Wang Ding , Yu Hong Yi , Wu Ying
Published: May 2014

This paper derives the performance equation of differential calibration using TDOA and FDOA measurements in the presence of multiple calibration sources when the receiver positions and velocities have random errors. It analyzes the effect of error restraining by differential calibration. It proves through theoretical derivation that the location performance of differential calibration depends heavily on the calibration source amount, position distribution and measurement accuracy. Furthermore, badly selected parameters result in location failure. The theoretical results in this paper are verified by Monte Carlo simulations. The calibration source optimization is proved to be effective.
Effect of Core/Shell Ratio on Performance of Paraffin/Polyurea Phase Change Microencapsules
Authors: Luo Wu Sheng , Yu Sheng Fei , Zhou Jie Min
Published: May 2014

In this paper, paraffin/polyurea (PU) phase change microencapsules were prepared through an interfacial polymerization method using composite paraffin with solid/liquid mass ratio 3:7 as core materials, 2,4 toluene diisocyanate (TDI) and ethylenediamine (EDA) as monomers, NP-10 as an emulsifier. It was explored the effect of the monomer mass ratio mEDA: mTDIon the yield of hollow PU microcapsules, and the effect of core/shell ratio on the particle size and coating efficiency and storage-energy performance of paraffin/PU phase change microencapsules. The experimental results showed the PU yield is increasing with the increasing of EDA:TDI mass ratio until 0.5:1,then keeps the constant. Paraffin/PU phase change microencapsules prepared with the core-shell ratio of 2:1 have better performance: the melting point of 28.1°C, the enthalpy of 58.4KJ/Kg, encapsulation efficiency of 87.5%, the average particle size of 4.32μm, and the uniform particle size distribution.
Based on the Mechanical Characteristics of Wheat Biomass Detector Research
Authors: Zhu Shi Sha , Lei Xian Hua , Zhu Yan Shu , Liu Jin Gang
Published: May 2014

Biomass is an important index to reflect the situation of crop growth. It has a great significance to detect the wheat biomass quickly and nondestructively for wheat breeding and production management. In this paper, a wheat biomass detector prototype is developed based on the biomechanical characteristics of the natural growth wheat stalks, And then the accuracy of this prototype is validated.Through the analysis of data in field tests, the relevance between the resilience force of stem achieved by prototype detector and the ground biomass of wheat is more than 0.86. It means using the prototype detector to forecast the wheat biomass is feasible.
Positioning Method without Current Navigation Data
Authors: Li Ji Zhong , Wang Rui
Published: May 2014

Positioning errors were found through the analysis to AGPS positioning algorithm with mobile station (MS) clock error. These errors are engendered in the process of calculating the pseudo-range. Using fuzzy algorithm, the large positioning error of several hundred kilometers was eliminated. After this method, the objective function is quadratically related to the deviation of reference time. The objective function curve were fitted with three reference time values and determined the lowest point of curve to amend the reference time. This method removed residual positioning error.
Design of Monitoring System to Marine Diesel Engine Supply Units Based on Forcecontrol Monitoring Software
Authors: Chen Jin , Liu Shi Jie , Li Qiao , Ning Xiao Bo
Published: May 2014

In order to understand the working position of the status of marine diesel oil unit in time, reducing the failure rate and improving fuel supply efficiency, Forcecontrol monitoring system based on PLC and Configuration Software is designed. The lower computer S7-200Smart PLC is collected the signal of the system such as temperature, pressure, viscosity and flow rate sensor periodically, by means of analyzing data, outputting a control signal to control the corresponding valves opening or closing as well as various types of motor start or stop status. A Forcecontrol monitoring configuration software is used as upper computer, to execute remote control and monitoring of the system.The system can realize video surveillance of field apparatus via the Forcecontrol configuration software without adding external devices and keeping high system integration, and achieve application innovation of Forcecontrol monitoring configuration software.
Research on GPS Positioning Error and Improvement Measures for Ships
Authors: Song Hao Ran
Published: May 2014

Position technologies is the basis of maritime navigation system as a whole, almost all functions of the system are predicated on ship position accuracy. Position accuracy and timeliness is directly related to navigation systems practical value and overall performance, so locating the main source of error is the navigation system error. Insights into the causes of these errors, in marine transportation organizations, navigation safety and accident prevention has played a huge role.
Application of Linear Algebra in Real Life
Authors: Deng Ji Xia
Published: May 2014

Linear algebra is an important basic course in university mathematics, finite dimensional vector space and linear transformation theory mainly on matrix theory, and the combination of matrix. Concept in linear algebra is defined directly by the mathematical symbol, rarely by example to import. How to make students master the abstract and difficult course, first of all is to let the students find the course in our daily life, to stimulate interest in learning.
Grey Predicting Model: Rice Output of Baise City
Authors: Xu Da Ming , Li De Wang , Wang Wu Sheng
Published: May 2014

By using rice output data of Baise statistical yearbook from 1989 to 2010, based on the Grey theory and Grey forecast models, which are GM(1,1), have been adopted to predict the rice output of Baise city in this paper. So we get the GM(1,1) prediction model and predict the rice production of Baise city from 2011 to 2020. The results show that the Grey theory model in predicting rice output is feasibility and reasonable.
Security of an Attachable Blind Signature
Authors: Wu Wei Chen
Published: May 2014

This paper presents a security of an attachable blind signature by Yeh et al. An eavesdropper is able to construct the attaches message m’ from an intercepted blind document. Consequently, attachable blind signature is breakable and cannot protect privacy.
Consensus Maximum Margin Criterion for Classification of Proteomic Profile
Authors: Yang Xiao Li , Li Dong Xia
Published: May 2014

We propose a new technique for cancer diagnosis from proteomic profile, which mainly contains four steps. Firstly, the original profiles are preprocessed by baseline correction, denoising, compression and rescaling. Then, the profiles are modelled by maximum margin criterion (MMC) analysis. After that, a consensus technique is utilized to identify the discriminant features. Finally, support vector machine (SVM) is applied to classify the modelling data. To study the validity of the proposed method, it is worked on classifying two proteomic profile datasets, the normal and the cancer samples. The results show that the method is efficient.
A Novel Deduction of Stokes Parameters Based on 2-ordered Basis Matrices
Authors: Ji Jin Zu
Published: May 2014

Four two-ordered basis matrices were introduced to deduct Stokes parameter representing electromagnetic wave polarization. Two of them have algebra features similar to unity and imaginary of complex number, so an exponential function was defined which can easily express some matrix operation such as coordination rotation in 2-dimension. The other 2 basis matrices were also incorporated to deduce the Stokes parameters. The four matrices have some fatigue algebra structure which was incorporated in deduction. The coordinate transformation was converted to some matrix problems and we get a more concise result.
Resource Scheduling Simulation Research Based on Marine Operation
Authors: Lin Hua , Xie Bin
Published: May 2014

According to the characteristics of marine operation, this article designs a simulation method of marine operation resources scheduling, and improves multi-dimensional dynamic list scheduling algorithm to make it applicable to the marine resources scheduling of unit level. Simulation results are obtained through a simulation based on an anti-submarine mission. Finally analysis on the existing problem of the simulation framework combined with the actual situation is enumerated, and further study direction is put forward.