AF/PSTM was designed by our group. This system use a tiny probe to scan the subtle singles on the surface of a sample, which break the confine of the tradition diffraction limit and has a resolving power in nanometer dimension. In one scanning the system gets tow AFM image and two optic image respectively (a index image and a trans image), however index image is a relative value which show the...

Energy and environment have become critical issues for the survival and development of human beings nowadays. Since bearing the advantages of non-pollution, time-saving, flexible-investment, room-saving, wind power has good economical and social benefits. With the wind turbine becoming larger and larger, and the load it endured is also very complicated, the problem of safety in the wind turbi...

With the set up of the new time service system of low frequency time-code in our country, it is urgent need to research the method and instrument for field strength measuring of the LF time-code signal. In this paper, this problem is researched according to prevenient experience, and a small size

With the development of power electronics, harmonic, which is produced by power electronic equipments, pollutes the power system more and more seriously. Not only harmonic influences the power system and equipments, but also the power energy wasting made by harmonic is increasing. This reduces the efficiency of power energy.The structure and measure method of the current measurement equipment...

With the development of electronics, the technology of control and manage by computer have been abroad applied to all business. As the production of age, IC card that has the characteristic of big memory capacity, best privacy nature, portable and reuse, meets the power industry’s higher expectations of measure, control and manages of electrical energy. As a new tool of casher, IC card prepa...

The thesis comes from the National High-tech Research and Development Program (863 Program): the research of cognitive radio technique. With the rapid development of wireless communication, the finite spectral resource becomes more lacking in the fixed assignation mode, in which the utilization percent of spectral resource is low. Cognitive radio is defined as an intelligent wireless communica...

Since 1980\’s the increase of nonilear loads leads to serious harmonic problem. With traditional theory, which is only suitable for sine wave, power under nonsinusoidal condition, can not be defined. So it is necessary to research power measurement under nonsinusoidal condition.Model of typical harmonic sources are made in this paper. Information on this kind of sources of disturbance su...

The instrumentation industry is undergoing a variety of exciting changes as a result of the development of PCs, The PC revolution has equipped users with powerful processing and display capabilities of their own. The computer can enhance instrument functionality in any of the three areas-data acquisition, analysis, and presentation. Virtual instrument (VI) changed the ideas of traditional inst...

Noise source identification is a primary and an important task in noise control, because it can provide an effective means to test the quality and improve the noise vibration system. At present the main methods for identifing the noise source include the elimination method, sound intensity measurement method, acoustic holography method etc. Acoustic holography method belongs to the non-contac...

Digital power meter is an instrument which was used to measure voltage, current, watt, var and powerfactors of electrical network. And it takes a very important role in electrical industry. This artical tells about how to design the measurement module, IEEE802.11b based wireless networks module of a wireless power meter. And the whole artical was divided into two parts.The first part is about ...