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It's very important to detect the leakage of oil pipeline timely and accurately in order to reduce the losses and ensure the smooth operation of oil pipeline. However, the leakage monitoring of the pipeline is difficult because normally the pipeline is very long and is often buried underground or underwater. Brillouin optical time domain reflectometry (BOTDR), which can distributedly measure the temperature...
To effectively monitor targets of interest, it's necessary to be aware of the object's movement direction in a monitored area. For this purpose, we propose a simple and accurate movement direction estimation method to determine the movement direction of tagged object through a Radio Frequency Identification (RFID)-based system, using the variation tendency of the signal phase received by two antennas...
In order to hold the hardware cost is not the premise of improving the positioning accuracy of sensor nodes, the paper proposed the node locaLization research of the underground wireless sensor networks based on DV-Hop and Ant Colony Optimization, this method of non-ranging DV-Hop algorithm calculate the distance between unknown nodes and beacon nodes, with the method of triangular positioning algorithm...
The principle of ultrasonic distance measurement is used by the system to achieve a non-contact measurement of liquid level on the simulated infusion bottle. Infrared Emitting Diode is used to monitor the speed of infusion. The signal which has been handled appropriately can be treated to achieve the high level, the remaining liquid volume of the infusion bottle, infusion speed and the remaining time,...
The paper analyzed the character, the origin and the danger of impulse interfere in the coal mine monitoring system. The impulse interfere in monitoring system has characters of sparse, shortness, and high amplitude. According to those characters, the adaptive denoising method based on FOCUSS was proposed to eliminate the impulse interfere. In the experiment, according to the procedures proposed by...
The effects of fentanyl on the middle latency auditory evoked potential(MLAEP), including the time domain, frequency domain and AR-model parameters, in cats are studied for the purpose of exploring the possibility of measuring anesthetic depth through MLAEP and proposing some new efficient and reliable techniques for clinical use. It is demonstrated that the parameters of AR-model, A1 and argument...
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