19,277 research outputs found
Germinação de sementes de jenipapo (Genipa americana L. - Rubiaceae) em função da temperatura e do substrato.
Resumo 334. Apresentado no 9º Congresso Brasileiro de Sementes
Estudo das populações de Eschweilera (matamatá) em uma floresta de terra firme na região de Paragominas, PA, considerando duas intensidades de colheita de madeira.
Comportamento populacional de cupiúba (Goupia glabra Aubl.) em 84 ha de floresta de terra firme na fazenda Rio Capim, Paragominas, PA.
Manilkara huberi standley (maçaranduba), em uma floresta natural na região de Paragominas, PA.
Supergiant Barocaloric Effects in Acetoxy Silicone Rubber over a Wide Temperature Range: Great Potential for Solid-state Cooling
Solid-state cooling based on caloric effects is considered a viable
alternative to replace the conventional vapor-compression refrigeration
systems. Regarding barocaloric materials, recent results show that elastomers
are promising candidates for cooling applications around room-temperature. In
the present paper, we report supergiant barocaloric effects observed in acetoxy
silicone rubber - a very popular, low-cost and environmentally friendly
elastomer. Huge values of adiabatic temperature change and reversible
isothermal entropy change were obtained upon moderate applied pressures and
relatively low strains. These huge barocaloric changes are associated both to
the polymer chains rearrangements induced by confined compression and to the
first-order structural transition. The results are comparable to the best
barocaloric materials reported so far, opening encouraging prospects for the
application of elastomers in near future solid-state cooling devices.Comment: 19 pages, 7 figures, 2 table
Nonprobabilistic teleportation of field state via cavity QED
In this article we discuss a teleportation scheme of coherent states of
cavity field. The experimental realization proposed makes use of cavity quatum
electrodynamics involving the interaction of Rydberg atoms with micromaser and
Ramsey cavities. In our scheme the Ramsey cavities and the atoms play the role
of auxiliary systems used to teleport the state from a micromaser cavity to
another. We show that, even if the correct atomic detection fails in the first
trials, one can succeed in teleportating the cavity field state if the proper
measurement occurs in a later atom
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