This paper analyzes the characteristics of four kinds of possible channels in UHF RFID communication system, and makes a deep analysis on additive white Gaussian noise channel and binary symmetric channel. At the same time, it sets up the ASK modulation and demodulation simulation models of those two kinds of channels, summarizing the relationship between the bit error rate and the variety of signal to noise ratio of those two kinds of system. Finally, it concludes the optimal parameter of transmission process in the RFID system in experiments.

Effects of solar panels must be taken into account by the light intensity of its output characteristics in practical application, especially solar panels placed outdoor. So the light intensity coefficient is an important parameter to be considered. In this paper,we took the light intensity characteristics of single crystal silicon solar cell as the research object. Also,through transforming the illumination intensity which are 777.60W/m2,996.97 W/m2 and 1224.88 W/m2, we would finish researching the characteristics of the cell sheet, which included battery plate volt ampere characteristic, open circuit voltage, short circuit current and maximum output power. Also, we’ve got the relationship of Uoc-T, Isc-T and Pm-T, respectively and Put forward the better intensity theory. It would lay a solid foundation of practice for the further study on how to improve the rate of light conversion.

For the needs of laboratory equipment management, combined with development of RFID, a laboratory equipment management system is designed based on RFID. System design is briefly described. UHF RFID reader design is described in detail. The anti-collision algorithm of ISO 18000-6C protocol is partially improved, so that the reader is able to make real-time adaptations of the anti-collision algorithm using IAP according to the quantity of laboratory equipments, thus raising the efficiency of algorithm recognition. Experimental results prove that the system design has reliability, stability and certain practical value.

This article describes the overall processing technology of the ultra-long cylinder, especially the internal pull the hinge hole processing technology from the tooling, cutting tools to machining parameters are introduced in detail to solve the difficult problem of processing very long hole, cylinder machining accuracy is guaranteed.

This paper describes the work Principle of the automatic piston ring chamfering machine，It describes detailed hardware, software design of electrical control system of the machine using MCU，The system realizes functions automaticly such as loading and unloading, piston ring’s plastic, piston ring’s pressure tight, piston ring’s chamfer, stopping short positions alarm, fault alarm, and the communication between the device and host computer.