Penning collisions of laser-cooled metastable helium atoms

We present experimental results on the two-body loss rates in a magneto-optical trap of metastable helium atoms. Absolute rates are measured in a systematic way for several laser detunings ranging from -5 to -30 MHz and at different intensities, by monitoring the decay of the trap fluorescence. The dependence of the two-body loss rate coefficient $\beta$ on the excited state ($2^3P_2$) and metastable state ($2^3S_1$) populations is also investigated. From these results we infer a rather uniform rate constant $K_{sp}=(1{\pm}0.4)\times10^{-7}$ cm$^3$/s.Comment: 8 pages, 9 figures, Revte

Applications of blockchain technology to education policy

Blockchain technology can be applied to education, for both learners and teachers, in many innovative ways as for getting a diploma in management or for the achievements assessment, but also on formative evaluation, learning activities design and implementation, and keep tracking the whole learning processes. For this research, we will focus on analyzing the scientific production of Blockchain technology in education using bibliometric analysis. Then based on the analysis of the literature, identify some recommendations for policy in order to redesign the educational system based on the application of blockchain technology.info:eu-repo/semantics/publishedVersio

Programa de cultivo de moluscos bivalves da embrapa Meio-Norte.

bitstream/item/35061/1/Documentos1830001.pd

Controlling the cold collision shift in high precision atomic interferometry

We present here a new method based on a transfer of population by adiabatic passage that allows to prepare cold atomic samples with a well defined ratio of atomic density and atom number. This method is used to perform a measurement of the cold collision frequency shift in a laser cooled cesium clock at the percent level, which makes the evaluation of the cesium fountains accuracy at the $10^{-16}$ level realistic. With an improved set-up, the adiabatic passage would allow measurements of atom number-dependent phase shifts at the $10^{-3}$ level in high precision experiments.Comment: 4 pages, 3 figures, 2 table

Seleção de linhagens de feijão resistentes à antracnose, grãos tipo carioca e outros fenótipos desejáveis.

o objetivo desse trabalho foi identificar entre as linhagens resistentes à antracnose, oriundas de um programa de retrocruzamentos, as mais promissoras, com alta produtividade, tipo de grãos Carioca, resistência à mancha angular e porte ereto

QUALIDADE do pescado.

Características sensoriais relacionadas à qualidade do pescado; Peixe; Marisco (Ostras e mexilhões); Manipulação e conservação. Equipe técnica: Fabíola Helena dos Santos Fogaça, Angela Puchnick Legat, Alitiene Moura Lemos Pereira, Jefferson Francisco Alves Legat.bitstream/item/126323/1/qualidade-pescado.pd

Levantamento das principais espécies de moluscos bivalves capturadas no Estado do Piauí.

CBO2010

Depuration of Anomalocardia brasiliana to increase the value of shellfish collected on the Piaui Coast, Brazil.

IUFOST 2016