Applied Mechanics and Materials Vols. 511-512

Abstract: This paper described the microstructure feature of the first short circuit and the second short circuit of copper wires in the electrical equipment line fire. The cause of fire is evaluated and analyzed by the difference in microstructure between the first short circuit and the second short circuit of copper wire. It would provide scientific and favorable evidence for the department of fireman to clear up a case of fire.

Abstract: This paper presents a new approach for obstacle avoidance of small mobile robots, which combine the position sensitive detector (PSD) with digital compass. It is important for an autonomous robot to explore its surroundings in performing the task of localization and navigation for searching. Because of the complexity of the environment, one simple kind of sensors is not sufficient for robot to accomplish these tasks. In this paper, the small mobile robots are enabled to identify barriers and distinguish surroundings by using the angle signal from the digital compass which is generally mounted on the robot. Experimental results indicate that this approach based on digital compass shows great potential in autonomous robot obstacle avoidance.

Abstract: The characteristics wind field impact flight safety, trajectory keeping, and navigation performance of Micro Unmanned Aerial Vehicles (MUAV) directly. Accurate wind field measurement is a premise for MUAVs to take various pre-reactions to gust disturbance. Due to its small size, light weight, and low speed, MUAV is easily affected by gust disturbance during its flight at low altitude. Real time wind speed estimation and flight control strategy adjusting can reduce the impact of gust and enhance flight safety. This paper proposes a method of using airborne IMU, GPS, and pressure sensors to estimate wind speed. Experimental results show that this method can effectively estimate wind speed accurately, and has important application value.

Abstract: In this work we reported the design and build of a nine-axis digital output gyroscope-based percutaneous puncture ultrasonic navigation system. The proposed system includes three types of sensing elements: three-axis gyroscopes, three-axis accelerometers and three-axis magneto-resistivemagnetometers. Gyroscopes are used to measure the absolute angular rate of the carrier. Theaccelerometers are used to determine the initial attitude of system and to correct for gyroscope drift in the tilt angles (pitch, roll) determination. The magnetometers are used to determine the initial alignment in heading and to correct for gyroscope drift in the heading. The nine-axis digital output gyroscope combined with ultrasound probe can accurately collect triaxial angle changes of the ultrasound probe, Then guide the orientation of the puncture needle in the ultrasonic navigationpercutaneous puncture. The system can increase puncture accuracy.

Abstract: In this paper, a self-healing optical voltage sensor (SOVS) based on the Pockels electro-optical effect and capacitive divider of BGO crystal is reported. A special design of automatic calibrating reference voltage source is used to solve the drift problem of measurement accuracy of an optical voltage sensor that was influenced by temperature. According to the mathematic models of capacitive divider and voltage sensors based on Pockels electro-optical effect, the real-time correction principle of sensing channel parameters is introduced, and the structure design of optical voltage sensor is given out. According to the IEC 60044-7 standard, the proposed optical voltage sensor is tested. The advantages of this voltage sensor in application and some testing records in a typical 220kV substation are introduced as well. The practical operation conclusion indicates the SOVS works stably, value of measurement is correct, and the configuration is good for extend in applications.

Abstract: QoS assurance and information security are important for multimedia data transmission in wireless multimedia sensor networks. First, the status of multimedia sensor networks was introduced. Then research status of QoS assurance and information security of wireless multimedia sensor networks was surveyed, and the related open issues were also analyzed. Finally, the technology routes to solve the open issues were also studied and discussed. We argue that trusted QoS architecture considering various applications with different QoS requirements is important for wireless multimedia sensor networks. And network conditions and protocol layers must be well designed in QoS-aware secure multimedia routing mechanism to satisfy QoS requirements of multiple traffic classes. Technologies of information hiding, multimedia data resolution, and multi-routing can be used for privacy protection in wireless multimedia sensor networks.

Abstract: Several types of middle ear implants have been invented as an alternative to conventional hearing aids for the rehabilitation of sensorineural hearing loss. To study the effect of the implanted site of their actuators on human residual hearing, a human middle ear finite element model was constructed. This model was build based on a complete set of computerized tomography section images of a healthy volunteers left ear by reverse engineering technology. The result shows that the tympanic membrane driving actuator and the incus long process driving actuator produce mass loading effect prominently at high frequencies. Whereas, the incus body driving actuator generates adverse effect on residual hearing mainly at low frequencies.

Abstract: Due to the development of the wireless communication technologies, wireless sensor networks (WSNs) are becoming more and more important in Internet of Things (IOT). In this paper, we proposed a design of a WSN for the enormous constructions structural healthy monitoring. Based on the analysis of the past project about the WSN for the highway healthy monitoring, we propose a novel design that can be used to guide the design of the future WSNs for the structural healthy monitoring. The focus of the design is the hardware design and the network layer design between the hardware and the users. In this paper we consider that 1) the WSN could detect the parameters related to the structural healthy, 2) the network layer design shall be able to utilize advanced wireless communication technologies, 3) the WSNs shall be able to provide the monitoring functionality and easily be reached by the users.

Abstract: The interaction of water hyacinth area with growth is known to be strongly influenced by area size, but little is known about the interdependent role that size and time have on dynamic estimation of water hyacinth area. We report on the fusion of specially designed, satellite and GPS sensor data into area growth model as a function of area and time. We employ a multi-sensor fusion technique that is able to generate uniform data of fitting area growth model with complete control of area and time. Evidence of an overall Goodness of Fit Index of 0.9753 was obtained by using conventional statistic analysis. These findings suggest that the multi-sensor fusion technique readily supports area growth model development with highly resolution. Moreover, it was found that area growth model enjoy an appreciable advantage when it comes to harvesting water hyacinth.

Abstract: Ecological restoration of degraded wetland ecosystem can be achieved by planning experts according to ground investigation, but with low efficiencies. We report that satellite sensors, maximizing ecosystem service values and minimizing ecological restoration cost improve ecological restoration efficiency. In particular, multi-objective linear programming (MOLIP), an optimal programming, improves ecological restoration efficiency by more than 250% in the return on investment of ecological restoration, using TM satellite as area sensors. MOLIP also enables efficient introduction of ecological restoration management without introduction of planning experts and ground investigation.