Research on a material for hydrogen purifying and flux controlling with application to space active hydrogen-masers

Hydrogen Masers with Cavity Frequency Switching Servos

The stability of the free-running hydrogen maser is limited by pulling of the unperturbed hydrogen transition frequency due to instability of the cavity resonance frequency. Zh~o automatic approaches to cavity stabiliz@zzatlon have been used successfully infield operabb atomic hydrogen masers in the past. One method is based upon the '!~pin-exchan@" tuning procedure and was wed in marers constr...

Precision measurements with atomic hydrogen masers

a new type-ii fuzzy logic based controller for non-linear dynamical systems with application to 3-psp parallel robot

abstract type-ii fuzzy logic has shown its superiority over traditional fuzzy logic when dealing with uncertainty. type-ii fuzzy logic controllers are however newer and more promising approaches that have been recently applied to various fields due to their significant contribution especially when the noise (as an important instance of uncertainty) emerges. during the design of type- i fuz...

Hydrogen Masers. I: Theory and Prospects

The discovery of the first naturally occurring high gain hydrogen recombination line (HRL) maser, in the millimeter and submillimeter spectrum of the emission line star MWC349, requires an expansion of current paradigms about HRLs. In this paper we re-examine in general the physics of non-LTE populations in recombining hydrogen and specify the conditions necessary for high-gain masing and lasin...

Clathrate hydrogen hydrate--a promising material for hydrogen storage.

Hydrogen is viewed as a promising clean fuel of the future. A low-cost hydrogen storage technology that provides a high storage capacity and fast kinetics is a critical factor in the development of a hydrogen economy for transportation. The technologies to store hydrogen can be classified into three types: compression, liquefaction, and storage in a solid material. 2] Compressing hydrogen requi...