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The origin of the early non-lethal weapons to protect themselves first and foremost, and secondly they do not want to harm innocent people, under the guidance of the design concept, the first to develop the necessary number of stun guns, while the Taser stun gun again produced by Thai Joseph gun most representative. From the first to the advent of the Taser now so popular in many countries, Tasers is unique in the field of non-lethal weapons. We believe in the future, adhering to the humanitarian spirit of the Taser will get better development, because the world will mainly develop non-lethal Taser weapons and better.

In the technical field of identification, the research of ECG technology is an emerging biometric identification technology. ECG (Electrocardiogram) signal is a kind of biological information with the features of random, uniqueness and difficult to be duplicated and forged, and is may be utilized as biological identity authentication. The characteristics of ECG signal and its feasibility as an identification method are analyzed in this paper. Also introduces the current ECG-based identification processing methods used by the domestic and foreign researchers and describes the process of its implementation. In addition, the problems existed in the research of ECG-based identification and its application prospect is also presented.

The paper briefly reviews the domestic and overseas lightning electromagnetic field data acquisition system, and the data transfer rate and data transfer approaches of lightning. Lightning data transfer approaches includes the conventional transmission systems of data collection, and three data transmission means which including the use of power system network to transmit data, the use of the Internet to transmit data and the use of satellite communications to expand the range of distribution.

This paper is about a kind of instrument which can detect the fault object by acoustic sensor detecting the object Surface acoustic signals, through the analysis of the acoustic signal of the intensity and frequency content, so determining the object if abnormal conditions occur. Design by using Piezoelectricity material as the sensing head, the signal processing circuit is based on SH79F32 microcontroller as the core, the single-chip microcomputer, integration with ADC, the analog signal from the sensor to convert them into digital signals, in the procedure, carries on processing to the signal frequency components, filter out low-frequency components, acoustic signal was finally measured on a screen display. including hardware design, production, processing, software programming, to obtain the acoustic fault detector, and to test its performance, results show successful.

The structure and principle of silicon micro-machined gyroscope used for rotating carrier is introduced. The dynamic equations of axially moving are derived by analyzing three-axis moving of MEMS three-axis simulator. The result of simulation shows three moving locus of the head of rolling airframe missile, and three output signals from silicon micro-machined gyroscope which fix on inner plate of three-axis simulator, some rules of three output signals of three moving locus are gained. The signal of the gyroscope couples the frequency of the rotating carrier which makes the coning motion, so the frequency of the coning motion is contained when detecting the frequency of the rotating carrier using the signal of the gyroscope. By analyzing the output signals using Fast Fourier Transform (FFT) algorithm, subtracting the frequency of the rotating carrier, and the relative error is only 1.25% by detecting the self-rotating frequency of the rotating carrier.