xuan hung dao

In this study, a magnetic-levitation (maglev) precise-position device will be addressed. The precise-position device will be designed to avoid friction in motion by using a non-contact track made up of permanent magnets and a bipolar active electromagnetic levitation platform. First, a nonlinear electromagnetic force will be analyzed thoroughly and the dynamic model of the precise-position device will be derived. Moreover, the levitation or landing force will produced by individual electromagnet with appropriate exciting current, which is decided according the designed control effort passing through the linear servo current amplifier and the bipolar switching circuit. Finally, the effectiveness and robustness of the proposed novel adaptive control strategy in this study is verified by microcontroller-based experimental results.

Abstract A preliminary model is introduced in this paper whereby data and its associated security properties are treated as a single atomic unit of information in a hardwareonly context. Security-tagged data allows each datum to be properly manipulated with a ...

Organically Modified Silicate (ORMOSIL) materials doped with organic dyes (Rhodamine 6G, Rhodamine B) have been prepared from sol-gel derived using Methyltrimethoxysilane (MTMS) as precursor. The synthesis process was investigated step by step using Raman spectroscopy, and the experimental results demonstrated that Methyl group bounds to silica oxide network remain in the final materials. Broadband laser emission of the materials has been obtained using 532 nm pump pulses from the second harmonic of a Q-switched Nd:YAG laser.

... Sun and Er [22] designed an optimized hybrid fuzzy PID controller combined with the fuzzy gain ... 1. This device is composed of two electromagnets, a gap sensor, a moving platform, linear ... Moreover, the air-gap between electromagnet and rail body can be measured by a gap ...