Atomic Clocks
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. ERROR BEHAVIOR OF ATOMIC CLOCKS ABOARD GPS SATELLITES
Abstract: The signal transmission and position quality obtained by GNSS positioning directly depends on the time control. The atomic clocks aboard the satellites are responsible for this control. In this research, the satellites clock errors of GPS are studied, using data from the pseudorange, the satellite semi-major axis and the correction parameters of th
Bol. Ciênc. Geod.. Publicado em: 02/12/2019
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2. Laser cooling techniques: standard and alternated optical molasses
The technique of laser cooling, whose basic idea was proposed in 1975 [1], provided the development of many important areas like high-resolution spectroscopy [2], atomic clocks [3] and quantum gases confined in magnetic or optical traps [4, 5]. Among the techniques applied to cooling neutral atoms is the optical molasses [6] that will be explored in this wor
Rev. Bras. Ensino Fís.. Publicado em: 22/05/2017
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3. Desenvolvimento de um laser de Nd:YLF bombeado por diodo laser e duplicado em frequencia para 657 nm / Development of a diode pumped Nd:YLF laser, frency doubled to 657 nm
Atomic clocks are used today in a number of scientific and technological applications, ranging from tests of relativity, or variations of fundamental constants, to the use in navigation and telecommunication. The next generation of such high precision devices will be based on optical transitions of suitable laser cooled and trapped atoms. In this work we des
Publicado em: 2009
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4. BRAZILIAN ATOMIC TIME SCALE: A PROPOSAL TO GENERALE A BRAZILIAN COORDINALED UNIVERSAL TIME / ESCALA DE TEMPO ATÔMICO BRASILEIRA: UMA PROPOSTA PARA REALIZAÇÃO DO TEMPO UNIVERSAL COORDENADO BRASILEIRO
Neste trabalho nós procuramos uma solução para o problema: como construir uma escala de tempo atômico baseada em um pequeno grupo de relógios atômicos? Nós geramos uma escala de tempo atômico independente a partir de um conjunto de relógios atômicos, chamada ETAB1(onrj). Nós propomos que a ETAB1(ONRJ) seja usada como referência para a geração d
Publicado em: 2000
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5. DETERMINAÇÃO DE INTERVALOS ÓTIMOS PARA CALIBRAÇÃO DE RELÓGIOS / DETERMINATIO OF BEST INTERVAL FOR CLOCKS CALIBRATIONS
In this work we study the application of the Box &Jenlins methodology to series of differences between precision clocks to define what is the best interval between calibratons. We use an ensemble of preceedings that allows the automatizion of this methodology to a level where there are no more need of human´s intervention. We propose the use of variance ana
Publicado em: 1999