Electrical and Control Engineering & Materials Science and Manufacturing

The following sections are included:

• Editorial
• Contents

There is a coupling between EMI signal detection point and signal injection point in DAEF. The performance of the DAEF cannot reach the best without the decoupling circuit. Therefore, we need to make further research on decoupling circuit. In this paper, through the design of decoupling circuit in DAEF, the impact of decoupling circuit on the filter performance of DAEF system is revealed. It has great guiding significance to the application of digital active EMI filter.

A disturbance observer-based generalized predictive control method for a spacecraft attitude system with parametric uncertainty and external disturbance is presented. First, a nonlinear generalized predictive controller is designed based on the spacecraft attitude model; then, a disturbance observer is constructed to sense the unknown terms in the predictive control law caused by system model uncertainties. It is proven that the proposed controller can make spacecraft track the desired attitude trajectory and force the tracking error to converge to a small neighborhood of the origin. Simulation results show the effectiveness of the method.

The problem of design of exponential stability non-fragile control for uncertain systems with time-varying delay is considered in this paper. Based on the Lyapunov stability theorem, and by using linear matrix inequality approach, a new approach is obtained to design the state feedback exponential stability non-fragile controller. By introducing a new Lyapunov functional, a sufficient exponential stability condition is given in terms of linear matrix inequality. With the non-fragile controller and the linear matrix inequality Control Toolbox in MATLAB, the simulation results are easier obtained.

Laser machine has been widely used in recent years. This paper mainly introduces the structure of laser drilling machine tool; main features of the control principle; equipment debugging method and emphatically analyzes the influence between the machine performance and the laser drilling process. The control mode introduced in this paper has good generality and can be applied to other types of laser machine tools.

In order to ensure an accurate prediction of the life of the transmission system, a gray BP neural network model is created. Flexible rate adjustment factor and adaptive inertia factor are introduced to improve the optimization performance of the particle swarm optimization. Once more, the gray BP neural network model is optimized by the particle swarm optimization. Finally, the prediction model is trained for the optimal solution. Simulation results show that this method gets good convergence rate while improving the prediction accuracy.

The harmonic/interharmonic emission principle of DFIG is derived theoretically and also verified through simulation and field measurements in this paper. To deal with sample data of variable-speed wind turbines accurately and get current spectrum including harmonic and interharmonic, a rotor speed based sliding window for harmonic analysis is proposed. The proposed method is applied to simulation results and field measurements to verify the effectiveness. Compared with spectral analysis using IEC61000-4-7, the frequency spectrum got from the proposed method is more complete.

At present the pumping units are used widely in oil fields, their main problems are wasting energy, low efficiency. While a linear motor pumping unit removes many shift gears structures, turn the traditional circum rotary drive into linear reciprocation drive, which made the units have more perfect motion performance, dynamic performance, and balance performance. The low permeability oil field's production mechanism is discussed, the properties and working principle of the linear motor is also analysed, furthermore the linear motor reciprocating pump production technology scheme is proposed in this paper. The test results prove that the oil production technology is effective to improve efficiency for oil production plant because it can solve the problems of side wearing, improve energy utilization rate, extend inspection pump and repair well cycle.

This paper investigates the reduced-order modified function projective lag synchronization of chaotic systems with fully unknown parameters. Based on the parameter modulation and the adaptive control technique, the dynamical evolution of third order chaotic system can be synchronized with the projection of a fourth-order chaotic system according to desired scaling function matrix. The given scaling function can be an equilibrium point or a periodic orbit. Numerical simulations demonstrate the effectiveness of the proposed scheme.

When we do harmonic modeling of variable speed wind turbines (VSWT), the peak value of the harmonic and inter-harmonic, puzzled us. In this paper, we find the regularity of this issue and consider the impact of variable frequency. As the frequency of a certain inter-harmonic usually is not fixed and changes with the variation of rotor speed. This paper defines a new harmonic model of wind turbine by dividing harmonics into fixed frequency harmonics (FFH) and variable frequency harmonics (VFH). Simulation results are verified with actual measurement data to present the performance of this method, which verifies the validity of this model.

Health is the basis of human development. Medical and health care are closely linked to the happiness of millions of households. Information technology contributes to build better health care for the majority of resident services, reduce health care costs and save health resources. This article collects the data that based on the regional hospitals and providers of historical and applies the advanced predictive models. Auto regressive integrated moving average model (ARIMA) to predict drug demand of the area hospitals. The advanced technology to drug management for hospitals with the combination of advanced management technology and information technology, which ensure both sides of drug market benefit from the supply chain and achieve win-win situation.

In order to ensure the stable operation of the entire system, can function. Only motor normal operation but failure will cause a serious impact, real-time monitoring of the operation of the motor is needed. PLC can be prepared a powerful fault diagnostic procedures, the article describes the design process of the motor failure monitoring system based on PLC. The article presents a simple introduction to the basic content of the PLC course of development, applications, system design, and then briefly introduced the types of failure of the motor, and the final design of the motor failure monitoring system based on PLC.

The environments that the pumping units are working in, is always severe and the downhole condition is very complex, so it's difficult to diagnose the faults of the pumping units. The indicator diagram can be a good indication of the pumping unit's work conditions, it is also the main basis of fault analysis. Judging from the pumping unit's faults using intelligent algorithms is also the demand of digital oilfield. The key is how to extract the indicator diagrams' features and what kind of intelligent algorithm is applicable. In this article, we first extract seven moment invariants of the typical faults' indicator diagrams, then we use ART2 neural network to classify these moment invariants. In which way, we can recognize pumping unit faults efficiently.

This paper establishes one method based on artificial immune and neural network to resolve the problem of Reducer fault diagnosis. Firstly, a neural network model that has one hidden layer and no connection among the nodes in the same layer is constructed, and the HHT method is adopted to extract the feature vectors of original signal which are taken as the network input. Then, the structure of neural network is optimized through regulating the number of hidden layers, connection weights, etc., under the artificial immune algorithm. The case results shows that artificial immune neural network performs pretty better than BP neural network in convergence steps, time and the relevant error.

This paper introduces the structure of the double AC motors speed-regulating experimental system and control methods of the system, and describes the application of the STM32 microcontroller: hardware module design and programming. With the SVPWM technology, software flow chart based on STM32 MCU is also given. Compared with traditional speed control system, this system is highly efficient and has energy saving, low-cost, flexible and superior speed performances.

Power equipment condition monitoring diagnosis (CMD) system consists of control centre master station system, integrated processing units (IPUs), thousands of field condition monitoring devices and communication network. It is difficult to coping with these different filed devices and different communication technologies. So, we standardize the configuration file, information model and information exchange model of field conditions monitoring devices based on IEC 61850. Firstly, the specification and validation rules of configuration file is developed. Secondly, the IEC 61850 logical nodes are extended based on the function of monitoring devices. Finally, it uses IEC 61850 MMS mapping as means of communication. Using IEC 61850 would simplify implementation, reduce installation costs and reduce maintenance costs.

On the basis of direct current (DC) power flow, we have established a linear security constraints unit commitment model. In the paper, the security constrained unit commitment problem is decomposed into two sub-problems by Bender's decomposition, (1) the unit commitment problem without security constraints, and (2) the transmission overload detection sub-problem. Penalty variables are introduced into the (2) to reflect the restriction and influence of the unit commitment to transmission line. Hence complementary constraint conditions—Bender's cut correlating the two sub-problems are set up by the use of the penalty variables and generation shift factors. They form the influence mechanism that the (1) sub-problem varies according to the (2) and means to modify the optimizing direction. Therefore, an algorithm for solving the two sub-problems alternatively is proposed. The calculation results of IEEE reliability test system show that Bender's decomposition algorithm is effective in solving security constrained unit commitment problem.

The safety control method of the rotary drilling rig with crowd winch is introduced. This control system consists of crowd winch stroke limit protection and safety control function, and the pulling force detection of the main winch and safety control function.

In the process of the filament winding control system, the tension of the winding is the key parameter to control. This paper establishes a dynamic model of the tension control system, analyzes the interference factors, and designs a intelligent control method.

To investigate difference of price's dynamic characteristics between different periods in different competitive electricity market, we applied multi fractal detrended moving average analysis (MF-DMA) to analyze multifractal natures of prices on-peak and off-peak of three typical localized electricity markets, namely, Canadian Alberta, Ontario and middle Columbia markets. The results demonstrate that there are huge differences multifractal natures of the prices between different periods in different markets. It provides a new view for uncovering dynamic features of prices in different periods.

This paper introduced a 48kHz/20kW LLC resonant converter module for Intelligent Universal Transformer (IUT) applications, which can supply high-frequency electric isolation and power conversion efficiently. With the high-frequency operation, the module has high power density by reducing the volume of core and winding. Additionally, it can work efficiently because of ZVS for primary active switches and ZCS for secondary diodes operating in LLC resonant mode. Firstly, all the operating modes are analyzed, which can explain the operating principle and features of LLC-modules, and the LLC-module gains are described based on frequencies and load characteristics. Secondly, the calculation method of the winding loss and core loss of high-frequency transformer and the effect of physical factors are given. Lastly, an experimental 48kHz/20kW LLC-module with the DC-voltage 900V-400V is constructed, the physical features of LLC-module based on the tested results under different load conditions will be described and analyzed in detail.

The models, methods and algorithms for power distribution network planning are summarized. After reviewing earlier planning models, new development of the planning models are sorted out from the aspects of the complication of models, the impacts of geographic information(GIS), distributed power supply and reliability management. According to the features of planning models, corresponding planning methods are summarized and analyzed. The advantages and disadvantages, as well as, the applicability of various algorithms are discussed. Finally, the prospect of distribution network planning research in future is analyzed.

Due to the challenges confronting the existed AC power system, the research on the MTDC networks is of significant importance both theoretically and practically. This paper presents the concept of introducing the application of MTDC technology in the distribution network. A five-terminal VSC and ring-topology based DC distribution network is proposed. Control strategy based on the above configuration with emphasis on the control of the bidirectional DC/DC converter is also put forward. Finally, the advantages obtained with such a DC distribution network are demonstrated by simulations using MATLAB/Simulink in different operation modes.

The power system short circuit of the drilling platform is caused by insulation damage and misoperation, etc. If the short circuit occurs in the main switchboard's bus (or trunk), there will be a short circuit current that is many times larger than normal current, it generates mechanical stress and thermal effect that leads to the damage of the generator and other electrical equipment. It will also cause the grid voltage to be greatly reduced and affect the electric equipment, thus endanger the safety of life and drilling platform facilities. The paper will make the analysis about the short circuit current principle, calculation method and estimation method for drilling platform power system, and compare the several different calculation methods. According to the characteristic of complex structure of the power system, this paper proposes a simple and effective short circuit current calculation method.

This paper presents a novel method to measure the fault distance in resonant grounded system during a single-phase-to-ground fault. By controlling the thyristors paralleled with damping resistance of Petersen-coil, a voltage and current disturbance, which contains plenty of frequencies, will appear at the port of faulted feeder and can be extracted to calculate the fault distance with the help of fault analysis theory. Calculated impedances under different frequencies can ensure the accuracy of fault distance measurement. This method does not need to add any equipment to the system and is easy to implement. Both theoretical and simulated analysis confirms its effectiveness.

This paper develops a framework for analysis of harmonics and inter-harmonics in a doubly-fed induction generator (DFIG). To perform a detailed and accurate harmonic analysis of a DFIG in the grid side current, a modified S-transform measuring method with adjustable Gaussian window regulator is proposed. Compared to the conventional fast Fourier transform (FFT), the proposed method considers the changing of the current in terms of frequency and amplitude. The system's overall measurement performance is considerably enhanced under higher frequency resolution. The results of both simulation and experiment are presented to illustrate contributions to spectral analysis of harmonics especially inter-harmonics that the modified S-transform measuring method can make.

Heat loss is an important factor that affects the reliability of the electromagnetic induction heating system. With the example of one 15kW high-power electromagnetic induction heating system, the heat source and heat loss of this electromagnetic induction heating system were analyzed. Through theoretical calculations, the heat loss was determined, the radiator design and fan selection were also done. By using the thermal simulation software of Flotherm to simulate the system, it showed that the results can meet the design requirements compared with experimental data of the prototype and it fully achieves the aim of the system reliability.

Online monitoring is an important tool for the management of power transformer. This paper put forwards an integrated processing unit (IPU) to standardize the remote monitoring of power transformers from different manufacturers, specified in according to IEC 61850; that includes casting, neutral point DC, temperature, moisture content, gases dissolved in transformer oil, on-load tap-charger, core earthing current and transformer cooling system. In a way, the remote monitoring comprehensively provides the real-time status of the transformers under management. Practical application showed that this uniform data model has provided only the real-time data feed, it has also enable the diagnosis of fault on transformers in this integrated environment.

The measurement of system ground capacitive reactance is very important for Petersen-coil tuning in resonant grounded system. A novel and effective way of calculating the ground capacitive reactance is presented in this paper. This method uses thyristors paralled with damping resistance in Petersen-coil to momently controll the operating state of damping resistance. Current and voltage disturbances will be generated when the thyristors are intentionally controlled. As the disturbances contain plenty of frequencies, the frequency response of system will be obtained. Then, the ground capacitive reactance can be calculated. Theoretical and simulation analysis have proved the effectiveness of the method.

For a certain faulted feeder selection device equipped on the neutral un-effective grounding distribution system (NUGS), it is conventionally hard to obtain the all-around performance with sufficient on-site information as the fault condition is extremely uncertain. According to the study for conventional structure of the distribution system, an NUGS is established on the real-time digital simulator (RTDS) platform, so that the faulted feeder selection devices can thus be tested under various fault conditions. By virtue of this method, various devices can be roundly tested in a very short duration.

Starting from the structure, principle of storage battery, and the performance of the battery, the valve control type sealed lead acid battery paper introduced the operation of the maintenance and the new technology is widely used in electric power system, in order to ensure system reliable and stable operation.

In this paper, a multi-objective optimization model of current limiting scheme based on the fast and elitist non-dominated sorting in genetic algorithms (NSGA -Ⅱ) is presented. The influence on impedance matrix caused by common current limiting measure is analyzed, and the sensitivity relation between current limiting measure and node self-impedance is proposed. The key technologies of the NSGA-Ⅱare introduced, the other questions when NSGA-Ⅱis used in multi-objective optimization of current limiting scheme are also discussed. In the end, combined PSASP with MATLAB, case studies performed on IEEE 39-node network demonstrate the effectiveness of this proposed model and method.

The traditional direct torque control has a large torque ripple as the tolerance range of the hysteresis comparators has great influence in the control performance. As the tolerance size itself is a fuzzy quantity, a fuzzy logic control is used to replace the traditional hysteresis comparators. The simulation results show that the current ripple and the torque ripple are reduced tremendously and the performance of the system is improved.

Energy storage is one of the supporting technologies in the smart grid. Battery energy storage system(BESS) has developed rapidly in recent years and becomes one of main technologies for large-scale application. One demonstration project of large-scale BESS in China was introduced. And functional tests were carried out to verify the effectiveness of BESS for renewable energy (RE) generation under four work patterns. The test results showed that BESS can satisfy the requirements of the PV power system very well. The operation data was recorded and analyzed to find out the requirements of BESS in the PV power system. It was pointed out that the system scale, the technical performance, the economy and the industrialization level were the critical indices to evaluate BESS technology.

Research activities and scientific research ability have become an important index of the comprehensive strength of colleges and universities. The business systems are significant for colleges and universities. However, the public data are not “public” or not been “shared”, that caused lot of duplicate data, brought the heavy workload to management personally of scientific research. This paper is based on the Wabacus framework to design a set of relative perfect scientific research informatization management platform, which replaces the traditional scientific business management process, using cloud services technology, through the public data platform, as a centre stage for all departments of colleges and universities to provide public data services. This strengthens the daily management of scientific research work, the integration of scientific research process, and provides real and effective reference basis for policy makers, so as to enhance the ability of scientific research management and is now a trend.

In view of the advantages of traditional methods for temperature measurement in coal mine, a scheme of temperature acquiring and monitoring based on wireless sensor network technology is put forward. The high integrated chip CC2530 including microprocessor and transceiver module is adopted, the digital temperature sensor DS18B20 is employed for acquisition, a wireless network based on ZigBee protocol stack is constructed and it can realize the data transmission between active nodes and slave nodes. The communication between microprocessor and PC is achieved by serial interface. Data processing, saving, displaying or alarming can be implemented. The system demonstrates that it can acquit temperature signal accurately and transmit wirelessly, and it has high precision and strong reliability. It is appropriate for monitoring coal mine.

Detecting and tracking interesting moving targets are crucial steps in intelligent video surveillance. We proposed a combination algorithm of Frame Difference and Particle Filter accelerated by FPGA parallelism. Parallel pre-processing and post-processing are added to Frame Difference to increase the anti-interference of detection. The improved Particle Filter hardware architecture can judge the tracking and lost status of moving targets by comparing the threshold of particle weight and the number of degenerated particles. Multi-target detection and tracking are implemented by reusing detection and tracking modules. Experimental results show the proposed hardware architecture shows great detection and tracking accuracy and real-time performance.

Considering the existence of a multi-antenna eavesdropper, the secure relay beamforming (SRB) problem for simultaneous wireless information and power transfer (SWIPT) in non-regenerative multi-antenna multi-relay networks is investigated. The objective is to maximize the achievable secrecy rate subject to individual transmit power constraint at relays and the energy harvesting (EH) constraint at EH receiver. Such an optimization problem is non-convex optimization problem and no tractable solution to the problem. In this paper, the optimization problem is transformed into several convex optimization sub-problems. Therefore, the optimization problem can be handled by solving convex optimization sub-problems in an alternating fashion. The average achievable secrecy rate of our proposed AO-based SRB scheme is shown by simulation.

In view of the need of the instant access capability to the communication system in the process of dealing with emergencies, the moving communication link based on satellite communication, mobile communication and HF communication is proposed. The proposed link can improve the survivability, timeliness and coverage ability of the emergency communication system. Therefore, it becomes possible that the rapid and effective response can be made to emergencies. At first, the network construction of the proposed emergency communication system with moving communication link is described in detail. Secondly, this question, how to use the proposed link to realize the effective transmission of emergency information, is discussed. Finally, the results based on OPNET simulation model shows that the proposed scheme has strong ability of network information transmission and it can meet the demand of emergency communication.

ADI's ADIS16228 chip combines a triaxial acceleration detection and advanced time domain in addition to frequency domain signal processing functions. In this paper, we used TI's CC2530 chip as the control unit of the wireless vibration sensor. By reading the ADIS16228 vibration data, and use the built-chip RF wireless communication, simplify the external circuit, and make the sensor compact. Meanwhile, in the MATLAB we used time domain signal obtained to do frequency analysis. Compared to the frequency domain signal provided by the sensor itself, it indicated that the sensor had a high accuracy and reliability, strong practicality in real-time monitoring of vibration.

This paper designs a V2I communication system for a low-speed intelligent car based on ZigBee, which allows the car to communicate with traffic lights. After the current situation of V2X and the system structure of the low-speed intelligent car are analyzed, ZigBee is proposed for V2I communication under the low-speed situation. An on board unit and a traffic light unit are both designed in hardware and software to meet the functional requirements. CC2530 is used in the design of ZigBee module. Finally, an integrated system is formed to demonstrate that the V2I communication is feasible and efficient on this application.

Proxy signature is a kind of digital signature with special function. From the analysis of a proxy signature scheme, it was found that the scheme can not resist the attack of vicious key generation center and it is not safe. On the basis of the scheme, we proposed a modified new ID-based proxy signature scheme, during the process of user's key generation in the new scheme, it is not really on key generation center completely. We analyze the security and efficiency of the new scheme and found that the scheme is secure and efficient.

With the proportion of “empty nester” rising year by year in China, the demand of ambulance services are growing. So we proposed and implemented a remote smart alarm system which is based on the body area network (BAN). It consists of signs sensors, smart alarm module and wireless communication. Among these three parts, signs sensors collect users' physiological data and transmit it to the smart alarm module for analyzing, and if physiological data are abnormal, users could be warned. If users need first aid from medical staff, they could ask for help using fingerprint identification function of smart alarm module to achieve “Finger Alarm”. In conclusion, our system provides a new way for the research of the remote smart alarm system which is based on the BAN.

We proposed a new quantum bit commitment scheme in which secret key need not to be provided by other quantum key distribution system. We can get the bit commitment with probability p by adding a waiting time in a frame during operating the BB84 protocol. Then the measurement outcomes can be encrypted by one-time pad with the key generated by BB84 protocol. We can also obtain the redundant secret keys to encrypt other information in this quantum key distribution system. The new scheme can be used to perform routing operation by which the source can be made sure that the virtual circuits it chosen doesn't influence on other relay routes in a large-scale trusted relay-based quantum network.

In this paper, a Tactical Data Link Communication System (TDLCS) simulation model mainly consisted of frequency-hopping spread spectrum (FHSS) module has been built by using the Simulink platform in Matlab. The single tone interference signal was added into this simulator. Frequency spectrogram figures and Bit error rate (BER) curves are obtained after simulations, which indicate that the frequency-hopping (FH) module of the TDLCS has a good ability to resist single tone interference.

An interference alignment (IA) algorithm that doesn't require channel reciprocity in multiple input multiple output (MIMO) cognitive radio network (CRN) is proposed. Multiple primary users (PUs) and multiple secondary users (SUs) are considered in the network. In the primary network, the PUs perform an IA algorithm to eliminate the interference between the PUs. In the secondary network, firstly, we encode the SUs and set up to the equivalent mode after eliminate the interference between the PUs and SUs. Secondly, we establish the cost function of maximizing the total capacity and apply the gradient method on Grassmann manifold to design the optimal precoding matrices. Finally, the receiver postprocessing matrices are designed by the criterion of maximizing signal-to-interference-plus-noise. Simulation results show that the same results are provided by the proposed algorithm and the existing typical algorithms at low SNRs, but the best results are provided by the proposed algorithm at high SNRs.

Accurate coordinate mapping between whiteboard plane and computer display for the large scalewhiteboard is a big challenge. Block partition mapping is an effective method to reduce the mapping error. However, segmenting too many blocks will increase user's operation in calibration, and coordinate mapping is not even in each block. To overcome these drawbacks, apartition-based five-point coordinate conversion method is proposed in this paper. The experimental results show that using the proposed method, the mean value of coordinate mapping error is reduced by 29.2% and standard deviation is reduced by 47.6%, compared with four-point coordinate conversion.

This article, based on analysis of visual expression of household appliance's graphical interface, annotates characteristics, means of expression and the influence on product styles of visual language of graphical interface from the angle of human-machine interaction. This article, aimed at coordinating and unifying styles of software and hardware interfaces in household appliance design, quotes practical refrigerator design cases to give explanations in order to realize stylized design of the style and interface visual language of household appliance product design in Internet era.

In order to predict software defects, this paper proposes a software defect prediction method based on complex network analysis. Most of the existing evaluation methods are based on undirected, unweighted network, failing to reflect the real situation of complex software. First, method proposed in this paper abstracts software system as directed weighted network on the granularity of class. Then, based on PageRank algorithm, this paper proposes KeyNodeRank algorithm to calculate node importance in global network. Node importance can be used to predict defects of software system. Experimental results show that the proposed method has a higher accuracy in predicting software defect. It has important significance for locating software defects, testing, improving software quality and software maintenance.

This article describes the handheld terminal system based on Raspberry Pi. computer vision and artificial olfactory using the characteristic value and the concentration of volatile gases, from the collected Pork would be send via GPRS to the host computer, then return the result after analysis; For the determination of the freshness of pork, rapid, portable detection. Experiments show that: the color of the fresh pork characteristic value changing with time after slaughter, reflective of the pork enhanced; Pork of ammonia, hydrogen sulfide concentration of volatile gases with a linear metamorphic time increased, 0.621 and 0.563 respectively. Experiments verified that the terminal has good detection accuracy and operability, with 99.1% accuracy.

A simple multiple kernel learning is proposed in this paper, named simple multiple kernel learning (SMKL). Different from general multiple kernel learning (MKL), SMKL constructs a new function space spanned by multiple kernels with a group of parameters for learning problem and then defines a new inner product on this solution space with a redefined symmetric positive definite matrix. We also propose a SMKL algorithm in a general-purpose framework for classification. The SMKL algorithm has a closed-form solution for optimization procedure without additional iterative operation appeared in MKL algorithm. Our proposed SMKL relieves the computational cost of general MKL algorithms. We implement experiments on two benchmark datasets to demonstrate the benefits of the proposed method.

Vehicular ad hoc networks (VANETs) have characteristics of intermittent connectivity, high mobility of vehicle nodes and dynamic topology, which make vehicular content distribution, especially for the multimedia files among vehicles very challenging. Deploying roadside units (RSUs) is a possible solution to overcome the challenges, but it often requires a large amount of investment. Due to the stable and extensive outside parking in cities, exploiting parked vehicles as the nature infrastructure to collaboratively distribute contents for moving vehicles in urban VANETs becomes a novel method to tackle this problem. In this paper, we investigate the connectivity of the roadside parked vehicle through percolation theory. Our analysis provides a theoretical basis for applications based on outside parking for VANETs.

This paper presents an algorithm of regression prediction for RSS (Received Signal Strength) based on SVM (Support Vector Machine) with granulating information, which can be used in selecting access network in heterogeneous wireless network environment. We normalized the RSS to increase accuracy of prediction at first, then implement the regression prediction for granulating RSS using SVM. Using this method, we can predict RSS of mobile terminal in the next 2 time point, so that the mobile terminal can start handover to access another network in advance and reduce the handoff latency. Simulation results show that the algorithm can predict RSS with better accuracy.

Removing the respiratory signal is a crucial topic to the high-quality ECG. But, not all models are available in the project. The use of digital filtering, signal averaging, adaptive processing and wavelet transform to remove the respiratory interference have some problems. The ICA algorithm for cancellation of respiratory interference is proposed. It is found that this method is more available to reconstruct high-quality ECG and de-noising artifacts comparing with the wavelet transform. Three steps are performed in the paper. From the simulation aspect, and from the evolution for the ability of de-noising the respiratory signal, as well as from reconstructing ECG, the comparisons between the results using ICA and that using wavelet transform are fulfilled. It is shown that the ICA algorithm is more powerful and more effective to de-noising the respiratory signal from ECG, almost not destroying the original ECG.

In this paper, adaptive strong tracking square-root version of the cubature kalman filter (AST-SCKF) is studied for the non-cooperative maneuvering spatial target tracking problem. The bearing-only measurements model and the influence of J2 perturbation are considered. The AST-SCKF combines the SCKF with STF, and it can switch adaptively between SCKF and STF by designing the moment matching rules, which has the advantage of accuracy and robustness. AST-SCKF achieves a tradeoff between the accuracy and robustness. The simulation results show that SCKF has a better performance than AST-SCKF for non-maneuvering target tracking. However, when considering the maneuvering target tracking, AST-SCKF provides better performance on estimation and robustness.

The text in an image is an important supplements to 939696414 the image information; meanwhile it is also an important basis for image-based retrieval. For high-level semantic information, text plays a significant role at present. However, due to the complexity of background color in an image, great uncertainty and differences exist in its position, brightness, size, thickness or the space, character extraction is always a difficult task in related application. In this paper, we introduce an approach to detect the region containing characters more precisely and efficiently. It is mainly based on the sparse representation based classification (SRC) method. With many images extracted from a news-video, which may contain different types of characters, the method has succeeded in detecting text region effectively and efficiently.

As one of the important research directions of Intelligent Transportation System (ITS), Traffic Sign Recognition (TSR) has become a hot topic worldwide. Due to the wide variety of traffic signs and complexity of road traffic environment, efficiency and correct recognition rate have to be taken into consideration in the design of TSR schemes. This paper uses principal component analysis (PCA) and extreme learning machine (ELM) to recognize traffic signs. Firstly histograms of the oriented gradient (HOG) features of each traffic sign are extracted, after dimension reduction by PCA, the dimension-reduced PCA features are put into ELM to train for an optimized recognition model. Database used in the experiments is German Traffic Sign Detection Benchmark (GTSDB). Experimental results show that the proposed method is able to recognize traffic sign in real-time with a high correct recognition rate.

Each type of risk for actions of open authorization actions based on windows is analyzed thoroughly, hierarchical reasonable security management and control model is proposed to decrease risks. Finally the institutions of management and control is designed to meet higher security demand with the granularity of monitoring and control based on roles for open authorization actions.

A new-type high frequency broadband acoustic transducer was put forward in this article. Two methods which are composite materials and multi-mode coupled vibration have been used to expand the bandwidth of a high frequency acoustic transducer. With the help of ANSYS software, we get the vibration characteristic of the piezoelectric vibrator by building and analyzing the mode of piezoelectric vibrator. Then, we confirm the optimal design scheme of the piezoelectric sensitive element according to the simulation results. The simulation results show that the -3 db bandwidth of this transducer can reach 340KHz to 420KHz and its maximal transmitting sound level can reach 147.8 dB. It can expand the bandwidth of the transducer effectively.

It proposed a vibration reliability calculation method for 3 degrees of freedom non-linear random gear driven systems. Comprehensively taking the influences of time-varying meshing rigidities, tooth flank clearances, bearing clearances, contact rigidities, and other non-linear factors into account, it built a 3 degrees of freedom non-linear gear-driven system's dynamic model and wrote a set of motion differential equations by the way of lumped mass method firstly. Secondly, it solved this dynamic model by the method of fifth order adaptive variable step method, so as to obtain the system vibratory time domain and frequency domain responses. Thirdly, different probability distributions of the system random structural errors were fitted, and this was a basis for sampling calculations for this random system by the Monte Carlo method; finally, this gear-driven system's vibration reliabilities at different time under influences of different random errors were calculated.

In machining, slender bar is a kind of shaft parts which is difficult to process. Because of its low radial rigidity, it is easy to bend under cutting force when in ultrasonic vibration turning or ordinary turning. The article builds model of slender bar deflection and proceeds numerical simulated analysis based on the model. Ultrasonic vibration turning system is built and the relative experiment is preceded. Then the influence of different parameters on the deflection of slender bar will be obtained.

The fine-grained as-rolled Mg-7.83Li alloy demonstrated the elongations to failure ranging from 500 to 600% at temperatures of 473-623 K at an initial strain rate of 1.67×10^-3 s^-1. The sample for temperature-strain-rate-changing tension exhibited a taper appearance and induced considerable dynamic grain growth. Observation by scanning electron microscope revealed that there are many dimples on the fracture surface and the fracture mode is intergranular fracture. The models of number of dislocations and dislocation density inside the grain and at the grain boundary were incorporated into the calculation of constitutive equations and four modified Ruano-Wadsworth-Sherby deformation mechanism maps (DMMs) were constructed. The new DMMs gave the distribution and the variation of dislocation parameters. It was shown that grain boundary sliding accommodated by slip controlled by lattice diffusion is the dominant superplastic mechanism of the present alloy at 573 K.

Antibacterial hydroxypropyl methylcellulose (HPMC) films were prepared by incorporating cinnamaldehye microcapsules and their properties were studied. Cinnamaldehye was encapsulated by chitosan and pectin through polyelectrolyte complexation. Encapsulation efficiency was 74.1% with 1:1 ratio of core and wall materials. The micrographs show more surface irregularity in HPMC films with the addition of cinnamaldehye microcapsules. The tensile strength of HPMC films decreases with the increase of microcapsule content. The elongation at break of HPMC films is largest with 5% content of microcapsule. HPMC films incorporated with cinnamaldehye microcapsules show good antibacterial activities and 10% addition is enough for control Staphylococcus aureus and E.coli.

On the basis of experiment platform, the deformation of the inking roller and the movement behavior of the rollers, including the axial movement of the vibrator roller and the speed of vibrator roller and inking roller, are measured. The results show that a speed difference exists between the two rollers, with a significant increase of the driving roller speed, the rotation speed difference and the line speed difference between the two rollers increase, i.e., the higher the vibrator roller speed is, the larger speed difference between inking roller and vibrator roller is; with the increase of ink amount on the roller surface, the speed difference increases significantly. Through the experiment data, the characteristics of the inking roller deformation and the rollers movement behavior are analyzed.

Objective: To explore the special cytotoxicity of TGFα-SAP and bFGF-SAP on proliferating vascular smooth muscle cells(VSMCs) and endothelial cells(ECs). Methods: Conjugation of saporin to TGFαand bFGF-SAP were accomplished after derivatization of saporin,TGFαand bFGF-SAP with N-succinimidyl-3 (2-pyridyldithio) proprionate and final purification of the conjugate were achieved within Eppendorf Centrifugal Filter Tubes. Cytotoxicity assays were measured by MTS method. The influence of TGFα-SAP and bFGF-SAP on values of Thymidine incorporation into SMCs and ECs was measured by ³H-thymidine uptake, respectively. Results: Cytotoxicity assays testified that TGFα-SAP conjugation could inhibit more remarkably the proliferation of SMCs in cell culture, compared with bFGF-SAP. The values of thymidine incorporation of TGFα-SAP group (10^-9M and 10^-7M) decreased to 60.9% and 56.0% respectively of the control group, suggesting that cellular DNA synthesis obviously decreased as TGFα-SAP was added. But Saporin did not affect cellular DNA synthesis even at higher level(10^-3M). After SMCs were exposed to TGFα-SAP and bFGF-SAP at the same level (10^-9M), the values of thymidine incorporation of TGFα-SAP group decreased 29.5% compared with control group while that of bFGF-SAP group only decreased 9.86%. TGFα-SAP at higher level did not affect DNA synthesis of ECs while bFGF-SAP did. Conclusion: The results indicated that TGFα-SAP possessed more efficient and specific cytotoxicity on proliferating VSMCs than bFGF-SAP.

A serious of hydrotalcite-like compounds such as Mg-Al-LDHs, Mg-Al-Cu-LDHs, Mg-Al-Fe-LDHs and Mg-Al-Ni-LDHs were prepared by coprecipitation. The structures were characterized by X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). TGA and DTA were used to characterize their thermal stabilities. Results from XRD and FT-IR showed that the prepared hydrotalcites had a typical layered structures and the layer distances of hydrotalcites with Cu²⁺ and Ni²⁺ were increased and the weak coordination bonds existed in Mg-Al-Ni-LDH and Mg-Al-Fe-LDH. The results of TGA and DTA proved Mg-Al-Cu-LDH has a better thermal stability and there are decomposition reactions happened in Mg-Al-Ni-LDH and Mg-Al-Fe-LDH under 100℃.

Objective: To investigate the different effects of gefitinib, as a new stent coating material, on proliferation of vascular smooth muscle cells (VSMCs) and endothelial cells (ECs) compared with those of paclitaxel. Methods: Cultured VSMCs and ECs were treated with different concentrations of gefitinib and paclitaxel respectively (24h, 48h, and 72h). MTT was used to detect the growth inhibition rate of cells. Western-blot analysis was used to analyze the protein levels of EGFR and p-EGFR. Results: The low concentration of paclitaxel and gefitinib had the same inhibition rate on VSMCs at the same duration. However, with the increasing concentration and extension of time, the inhibition of gefitinib on the proliferation of VSMCs was more obvious than that of paclitaxel. In addition, The inhibition of gefitinib on the proliferation of ECs was lower than that of paclitaxel at the same concentration and duration. EGFR was expressed in both of the two cell lines, while the expression of EGFR was higher in VSMC than in EC. Treatment with gefitinib significantly suppressed the expression of P-EGFR in VSMCs. Conclusion: Both of gefitinib and paclitaxel could inhibit the proliferation of VSMCs and ECs, while the inhibition of gefitinion on the proliferation of ECs was less than the inhibition of paclitaxel. So these results provide a theoretical and experimental basis for the application of gefitinib, as a promising stent coating material, in the treatment of restenosis and thrombosis after PCI.

Understanding of the tensile strength of the solid propellant bears important applications in materials science, aerospace, defense, and other engineering disciplines. To obtain the mechanical properties of composite modified double base (CMDB) propellant under impact loading, this paper proposes an indirect tensile testing method to measure the full dynamic tensile strength of the CMDB propellant under dynamic loads. The Flattened Brazilian Disc (FBD) specimen was impacted with a 14.5mm diameter split Hopkinson bar (SHPB) system. The pulse shaping technique is used to achieve dynamic force balance, and thus eliminates the loading inertial effect and enables quasi-static stress analysis. The experimental results show that the dynamic tensile strength of the CMDB propellant is loading rate dependent. The dynamic FBD method provides an easy and cost-effective way to measure dynamic tensile strength and other brittle composite materials.

Cobalt oxide/nitrogen-doped carbon nanotubes catalysts for the oxygen reduction reaction (ORR) were fabricated using a simple chemical plating method. Scanning electron microscopy (SEM) and Energy dispersive spectrometer (EDS) was used to characterize its structure. Electrochemical method studies show that the cobalt oxide/nitrogen-doped carbon nanotubes could exhibit a high ORR activity.

According to the results of electro-superplastic experiment of 1420 Al-Li alloy, the constitutive equation for electro-superplastic was established by revising superplastic equation. The electro-superplastic bulging processes of 1420 Al-Li alloy box part were simulated using the finite element software Abaqus. Then the forming results were analyzed comparatively with superplastic forming, and the influence of pulse current parameters on forming effect was investigated. The simulation results show that the pulse current can not only reduce the load and effective stress, but also improve the wall thickness uniformity during electro-superplastic forming of 1420 Al-Li alloy. The influence law of pulse current parameters on the thickness of box part in different areas is various, but in general, when the pulse current density is 192A/mm² and pulse frequency is 150Hz, the box part has the best forming results.

In order to research the cutting mechanism and machined surface topography of sandstone material, analyzing on the high-speed milling experiments under the two conditions of Dry-cutting and Wet-cutting by PVD coating tools. The results show that, when milling the surface of sandstone materials in a large grain density of quartz at a high-speed, on the machined surface morphology and chip formation and its topography of Wet-cutting, it can get better surface quality than Dry-cutting.

The curing behaviors of two-component epoxy resin was studied by means of Direct Tensile Test (DTT) in this research at the curing condition of 14 °C. The direct tensile strength was investigated as well. Research results illustrates that the investigated two-component epoxy resin needs about 4 days to get fully cured. While it has a DTS of 5 MPa after less than 1 day curing. The tensile strength of fully cured epoxy resin is dependent on the test temperature. The direct tensile strength of fully cured epoxy resin can reach to 20 MPa. The failure strain of epoxy resin is very small and not sensitive to the temperature and displacement rate.

The stiffness of fully cured two-component epoxy resin was studied by means of Dynamic Mechanic Analysis (DMA) in this research, as well as the temperature sensitivity and frequency sensitivity. The relaxation properties was included, both one fully cured resin and oven aged resin. Research results illustrates that the investigated two-component epoxy resin behaves as a rubbery elastic material and will not give viscous permanent deformation problems at temperatures above 60 °C. The epoxy resin has bitumen-like viscoelastic properties at lower temperature, while behaves as an elastic material and show very good high temperature resistance at higher temperature. The relaxation of the original epoxy resin is far less than the relaxation percentage of bituminous binders and epoxy modified bitumen. Research results approve that the oven ageing has hardly influence on the relaxation of epoxy resin.

Surface texture and friction greatly influence road functionality and have significant effects on user's safety and comfort, vehicle operational costs and environmental sustainability. Pavement surface characteristics include micro-texture, macrotexture, mega-texture and unevenness in relation to different wavelength classes. Friction depends on both macro and microtexture; in particular pavement initial friction is influenced by many factors, including aggregate properties (shape, texture and angularity), gradation, asphalt binder content, pavement construction, etc. Moreover, surface texture and, consequently, skid resistance change over time because of many deterioration phenomena. In the light of the above, this paper focuses on the evaluation of road surface micro and macrotexture evolution in relation to asphalt mix composition. Data were carried out from a two-year monitoring of an experimental road section where four different mixes were laid. Aggregates of different petrographic nature (limestone, basalt and expanded clay) were used for mixes production. Surface characteristics were monitored by several test methods and devices. Results highlighted significant differences in texture deterioration in relation to aggregate nature.

In this paper, the software of ABAQUS (One of the universal finite element analysis software) was used to do the simulation research on the steel tube filled with steel-reinforced concrete which subjected to the eccentric load after high temperature. The effect of temperature and slenderness ratio on the mechanical properties of the composite column was studied. Meanwhile, the simplified calculation formula of the stability bearing capacity of the composite column after high temperature was derived, and the calculated results show good agreement with the simulated results.

The characters of unconventionality, unpredictable, typical catastrophic and uncontrollability of emergency incidents have caused great difficulties for emergency decision-making and management. Furthermore, in the complex situation of highly dynamic, resource scarcity, time pressing and severely uncertainty, emergency decision-making is constrained by the many factors such as limited time, limited resource and human resource etc. Therefore, it is necessary for the decision makers to explore the judgment of current emergency scenarios and future trends to make timely and accurate decision. In this paper, we use the scenario planning and multi-criteria decision-making analysis to make a real-time and effective emergency decision, under the complex situation which can avoid redundant or irrelevant information, reduce cognitive bias of decision-maker and combine different types of decision-maker's attitude to risk.

According to the present situation of underground waterproofing design of waterproof material durability far shorter than the building service life, the waterproof construction of equal life cycle with substructure is putted forward, which aims to control of seepage water leakage phenomenon and ensure the normal use of engineering with improving the waterproof construction scheme and detailed waterproof construction. With the case of a high-rise office building in Zhengzhou expansion project's deformation joint seepage management structure, some comprehensive treatment managements are put into effect, which are adding drainage wall, sealing and grouting pipe embedment and check the pressure ring, external wall waterproofing and drainage channel. The project meet water requirements after two years of testing.

Fluid-solid coupling theory and Modified Cam-clay Model are deduced and dealt with in detail. Finite element equations are introduced when the deformation is considered under Coupled Deformation and Seepage Fields. Numerical simulation is carried out during the construction of the dam based on Fluid-solid coupling theory and Modified Cam-clay Model. All the results calculated are in accordance with the general law of the dam. Those show that it is feasible for calculating the stress field and displacement field. The method adopted and those results gained by numerical method may provide reference to engineering practice.

Current correction to the Fick's second law was summarized to research chloride diffusion in concrete. Theoretical diffusion model was established especially for bonded strengthened concrete. The method to consider the impact of externally bonding to the diffusion was first put forward. Numerical simulation of chloride diffusion in a reinforced concrete beam strengthened by externally bonding was finished by ABAQUS, MATLAB PDE tool, MATLAB programming respectively. The characters of chloride diffusion were indicated in both strengthened and non-strengthened specimens. The simulation result shows externally bonding decreases the chloride concentration of steel surface and suspends it to reach the threshold value that leads to corrosion, so that the service life of RC specimens can be extended. The earlier bonding is carried out, the longer service life is achieved. This research could facilitate the durability design and life prediction of boned strengthened concrete in chloride environment as reference.

Study on the crack initiation time of the concrete brittle materials with low tensile strength under tensile loading, to know the tensile fracture mechanism and the safety assessment of monitoring of the components made of brittle materials is of great significance. In this paper, using the experimental method of combining the extensometer and Brazil disc split experiment, according to the deformation signal measured by extensometer can be a good judgment to the macroscopic crack of concrete cracking time.

The ultra-fine limestone powder can be used to replace cement or as admixture in concrete, improve the properties of concrete, reduce the dosage of cement and admixture, reduce cost, and realize the good combination of economical and environmental benefits. This paper presents the production process of ultra-fine limestone powder, compares research and application results of domestic and foreign scholars, analyzes existing problems, and provides reference for future research and application.

In this paper, an orthogonal test was used to select the optimum technological parameter of carbonated steel slag. Via orthogonal test with 5-factor and 5-level, process conditions are designed and discussed on production of a new kind of building material from BOF steel slag powder as raw materials by accelerated carbonation technology. The main measure of the orthogonal test is compressive strength which represents the mechanical property of carbonated steel slag bricks. The optimal technological parameters of carbonation bricks production were obtained by test, and the factors influencing compressive strength were analyzed, which could provide reference for improving the carbonation efficiency of the carbonated brick effectively.

In this paper, orthogonal experiment was designed pragmatically by five factors and five levels and then considering the content of f-CaO and MgO to determine the process parameters. Carbonation depth, content of free-CaO and MgO were quantitatively analyzed by phenolphthalein indicator, benzoic acid - ethanol standard titration solution and EDTA titration respectively. The volume stability of mortar was measured by autoclave test. The results show that the content of free-CaO of carbonated steel slag aggregate are effected, in the order from influence degree, by moisture, carbonated pressure, carbonated time, carbonated temperature and molding pressure. Their optimal parameters are 12wt.%, 0.15MPa, 8h, 60°C and 9MPa respectively. The specimens with the f-CaO content of more than 3wt.% are all spalled, and though 5wt% of MgO is existed in carbonated aggregate, volume stability mortar is unaffected.

A non-fitting nonlinear stress-strain constitutive equation suitable for tension and compression is set up based on concrete test data. This equation is successfully applied to nonlinear beam bending. Nonlinear bending moment-curvature is based on plane section assumption. The calculating example shows that the nonlinear bending moment-curvature equation is considerably correct for nonlinear analysis of engineering beam.

Non-linear geometric equations of bi-curvature beams, including curvatures-rotational angle equation, rotational angle-displacement equation and strain-displacement equation are derived using tensor theory. These equations established based on principle axes coordinate system of centroid are clear in mechanical concept, concise in expression form, and provide a foundation for finite element analysis of large curvature and nonlinear special beams.

A numerical model was created with program FLAC3D, and analyzed the influence of tamping energy on strengthening soft foundation disposed by dynamic drainage consolidation. The results showed that tamping has a more obvious effect on the vertical compression than the horizontal. With increase of tamping energy, the compression of both the vertical and horizontal increases gradually, but the vertical effect is more obvious than the horizontal.

The antibacterial properties of the components in building latex paint, such as latex, auxiliary materials, pigments and so on, were studied by testing the inhibitory ring and the minimal inhibitory concentration (MIC). The effect from each component on the antibacterial properties of paint film was further investigated. In this study, the antibacterial activity of 5 kinds of latex, 17 kinds of auxiliary materials and 8 kinds of pigments against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were tested. Experimental results showed that the antibacterial ring was observed in only one kind of silicone acrylic latex. Most of auxiliary materials in this study showed antibacterial effect on the two bacterial cells. None of pigment and fillers showed antibacterial effect. However, the paint films made up of the above components had no bacterial effect against E. coli and S. aureus after being dried for 7 days. The latex and auxiliary materials contained some toxic monomer and polar groups, leading to the antibacterial effect. But the antibacterial effect disappeared after crosslinking reaction during the process the formation of paint films. As a result, all these components showed little contribution to the antibacterial effect of paint films. The most effective way to improve the antibacterial effect of paint films was to add Ag-series of inorganic antibacterial materials or some organic antibacterial materials.

According to 7 high-strength reinforced RPC (reactive powder concrete) beams test-research, effects of the different longitudinal reinforcement ratio, different grades of steel bar, longitudinal reinforcement diameter and compression bar diameter of High Strength Reinforced RPC Beams cracking moment are analyzed in this paper. The formulas for calculating the resistance coefficient of plasticity in section and calculating the cracking moments of RPC beams with high strength are given. It is showing that the calculating results using this formulas have good agreement with the experimental results.

The following sections is included:

• Author Index