0000000000320521

AUTHOR

A. Gailitis

showing 2 related works from this author

AC Stark shift of the ground state of atomic hydrogen

2004

An analytical expression for the second-order AC Stark shift of the ground state of atomic hydrogen is derived, which is convergent for negative as well as for positive energies of intermediate states except for the resonances. To clarify the applicability of the second-order perturbation theory, we compared results with those which are obtained by us and other authors using nonperturbative methods. It appears that values obtained for the AC Stark shift using our simple formula agree on average with Floquet-method calculations up to the field strength F=0.12 (a.u.), which corresponds to I=1015 W/cm2.

PhysicsSecond order theoryQuantum opticsPhysics and Astronomy (miscellaneous)Condensed matter physicsHydrogenGeneral EngineeringGeneral Physics and Astronomychemistry.chemical_elementField strengthsymbols.namesakeStark effectchemistrysymbolsIntermediate statePhysics::Atomic PhysicsPerturbation theoryAtomic physicsGround stateApplied Physics B: Lasers and Optics
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RF-based node system for blind navigation in running activities

2008

The system presented is oriented for use by blind adults or children in running activities at a stadium or an analogical large space. The system dynamically provides a blind person with navigation related information. Radio signal strength measurements are used in localization task. The system makes a blind person more independent in sport, eliminating the need in explicit human assistance.

EngineeringDistance measurementbusiness.industryNode (networking)Real-time computingRadio frequencySpace (commercial competition)Radio signal strengthbusinessStadiumWireless sensor networkSimulationTask (project management)2008 International Conference on Signals and Electronic Systems
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