High magnetic field thermal-expansion and elastic properties of CeRhIn5_5

We report high magnetic field thermal-expansion and magnetostriction results on CeRhIn$_5$ single crystals. Several transitions, both first and second order, are observed when the field is applied perpendicular to the crystallographic c-axis. The magnetic field dependence of the thermal-expansion coefficient above 15 K, where the magnetic correlations are negligible, can be explained supposing an almost pure $| \pm 5/2>$ ground state doublet, in apparent contradiction with neutron scattering experiments. Although the spin-lattice interaction is relevant in this compound, the effect of the magnetic correlations on the elastic properties is relatively weak, as revealed by resonant ultrasound spectroscopy experiments.Comment: 5 pages, 6 figure

Variação genética em progênies de Pinus elliottii Engelm. var. elliottii em idade precoce.

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Maravilha: cultivar de arroz de sequeiro recomendada para a região oeste do Estado do Pará.

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Ensaio comparativo avançado de arroz de sequeiro em Alenquer, Pará - ano agrícola 1998/1999.

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Extinction time in growth models subject to binomial catastrophes

Populations are often subject to catastrophes that cause mass removal of individuals. Many stochastic growth models have been considered to explain such dynamics. Among the results reported, it has been considered whether dispersion strategies, at times of catastrophes, increase the survival probability of the population. In this paper, we contrast dispersion strategies comparing mean extinction times of the population when extinction occurs almost surely. In particular, we consider populations subject to binomial catastrophes, that is, the population size is reduced according to a binomial law when a catastrophe occurs. Our results show which is the best strategy (dispersion or non-dispersion) depending on model parameter values.Comment: 15 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:2109.1099