8,800 research outputs found
An exact master equation for the system-reservoir dynamics under the strong coupling regime and non-Markovian dynamics
In this paper we present a method to derive an exact master equation for a
bosonic system coupled to a set of other bosonic systems, which plays the role
of the reservoir, under the strong coupling regime, i.e., without resorting to
either the rotating-wave or secular approximations. Working with phase-space
distribution functions, we verify that the dynamics are separated in the
evolution of its center, which follows classical mechanics, and its shape,
which becomes distorted. This is the generalization of a result by Glauber, who
stated that coherent states remain coherent under certain circumstances,
specifically when the rotating-wave approximation and a zero-temperature
reservoir are used. We show that the counter-rotating terms generate
fluctuations that distort the vacuum state, much the same as thermal
fluctuations.Finally, we discuss conditions for non-Markovian dynamics
Comment on "Spin-1 aggregation model in one dimension"
M. Girardi and W. Figueiredo have proposed a simple model of aggregation in
one dimension to mimic the self-assembly of amphiphiles in aqueous solution
[Phys. Rev. E 62, 8344 (2000)]. We point out that interesting results can be
obtained if a different set of interactions is considered, instead of their
choice (the s=1 Ising model).Comment: Accepted for publication in Phys. Rev.
Electronic properties of curved graphene sheets
A model is proposed to study the electronic structure of slightly curved
graphene sheets with an arbitrary number of pentagon-heptagon pairs and
Stone-Wales defects based on a cosmological analogy. The disorder induced by
curvature produces characteristic patterns in the local density of states that
can be observed in scanning tunnel and transmission electron microscopy.Comment: Corrected versio
Ornithological bibliography of the Azores
Only scientific publications up to 1980 are included in this bibliography. Other old narrations containing information on Azorean ornithology are being assembled for future publication. Certain unpublished works will also be dealt with. The part for consultation has been arranged in three sections. The first presents a numbered list of papers and books in chronological
order up to 1980. Last minute alterations obliged us to eliminate some items and to use «bis» for repeated numbers in some cases. The second section consists of the list of papers under their authors in alphabetical order. Finally, the third section consists of an index of the scientific names of the species cited.
The index contains three types of entries:
- The names of the genera, in capital letters, followed by the specific and subspecific names, which lead to their numbers in the chronological list. The latter are accompanied by the relevant page numbers, in brackets. - The names of the species, in small letters in bold-faced type,
lead to the names of the genera. - The names of the subspecies, in normal small letters, lead to the genera and species. Example: Fringilla coelebs moreletti entered under FRINGILLA, coelebs and moreletti, with the
bibliographical references only under the complete name. Papers of Nºs. 17, 41, 72, 74, 76 have not been consulted by us; all other works are available in our library
Phytoseiid mites of Colombia (Acarina: Phytoseiidae).
This is the second report of the phytoseiids of Colombia. A new genus and species, Quadromalus colombiensis and Euseius ricinus n.sp. are described, bringing the total to 17 species of phytoseiids for Colombia
Aflatoxina M1 em leite: um risco para a saúde pública.
Introdução. As Aflatoxinas. A Aflatoxina M1 (AFM1). Mecanismos de contaminação do leite por AFM1. Principais efeitos tóxicos. Relação de AFB1 ingerida e a concentração de AFM1, excretada no leite. Prevenção. Métodos de detecção e qualificação de Aflatoxina M1 em leite e derivados. Legislação. Referências bibliográficas.bitstream/item/79983/1/doc67-2005.pd
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