14,279,338 research outputs found
Top-bottom mass hierarchy, puzzle and gauge coupling unification with split multiplets
A supersymmetric 5D SU(5) grand unification is considered. The SU(5) is
broken down to by the
assignment of the bulk field(s). The matter fields are located at the fixed
point(s). In the bulk, a Higgs multiplet (containing the bottom
doublet ) and the SU(5) gauge multiplet are located. At one fixed point,
(the top doublet) and the standard model matter multiplets are presented.
Because of the difference of the locations of and , one can obtain a
hierarchy between top and bottom Yukawa couplings. We also present a
possibility to understand the mass puzzle in this framework of the
split multiplet.Comment: LaTeX file of 17 pages including 3 eps figures. A note is added and
typo errors corrected. To appear in Euro. Phys. J.
Carrapato e vermes: inimigos do gado e do produtor.
bitstream/item/65290/1/CT-95-Carrapato-e-vermes.pd
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O tempo do arquivo: a decadência do museu e a poética da história
Neste artigo, estou interessado na instituição moderna do museu ocidental. Muitos museus tiveram seu começo no século XIX e persistem até hoje influenciando, além dos centros Europeus e Norte Americanos, o desenvolvimento subseqüente de outros museus pelo mundo. Não existe uma problemática única que defina o museu, assim como temos que reconhecer que eles são variados em tipo, em escala e no alcance de suas ambições
A reconnaissance of the possible donor stars to the Kepler supernova
The identity of Type Ia supernova progenitors remains a mystery, with various
lines of evidence pointing towards either accretion from a non-degenerate
companion, or the rapid merger of two degenerate stars leading to the
thermonuclear destruction of a white dwarf. In this paper we spectroscopically
scrutinize 24 of the brightest stars residing in the central 38" x 38" of the
SN 1604 (Kepler) supernova remnant to search for a possible surviving companion
star. We can rule out, with high certainty, a red giant companion star - a
progenitor indicated by some models of the supernova remnant. Furthermore, we
find no star that exhibits properties uniquely consistent with those expected
of a donor star down to L>10Lsun. While the distribution of star properties
towards the remnant are consistent with unrelated stars, we identify the most
promising candidates for further astrometric and spectroscopic follow-up. Such
a program would either discover the donor star, or place strong limits on
progenitor systems to luminosities with L<<Lsun.Comment: accepted by Ap
Citizenship Education within the process of portuguese social democratization
Propomo-nos discutir, neste texto, algumas das raízes do ideal de cidadania ao nível do debate pedagógico, tal como se desenvolveu em Portugal nos anos 60 e 70 do século XX, um período marcado pelo final do Estado Novo autoritário e pela fase inicial de construção da democracia portuguesa, que sentiu a necessidade de educar os cidadãos para o exercício pleno do seu papel, numa perspectiva crítica e participativa. É, em particular, no período revolucionário que o projecto de democratização do ensino se torna central na agenda educativa, surgindo Rui Grácio (1921-1991) como uma figura marcante, não só da reflexão sobre essa matéria como da tentativa de a concretizar no terreno educativo, por via de experiências como a unificação do ensino, o serviço cívico estudantil ou a educação cívica e politécnica. É os contornos dessa reflexão e dessa acção que procuraremos aqui delimitar
Typification of names of Clusiaceae based on material collected by August Weberbauer in Peru
August Weberbauer was a German botanist who worked for most of his life in Peru. Many species have been described based on specimens collected by him, which were mainly deposited in the Berlin herbarium (B). After the bombing of the Berlin herbarium during World War II, it was assumed that most of these types had been destroyed, duplicates rarely existed and neotypes had to be designated. However, during visits to Peruvian herbaria we rediscovered some overlooked duplicates of specimens of Clusiaceae. In the present paper, we designate lectotypes of ten names based on these Weberbauer collections and report additional duplicates found in the herbarium G. Some former incorrect typifications are corrected, and the problem of destroyed types in herbarium B, often known mainly from photos made by J. F. Macbride, is briefly discussed.492193196CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP311744/2017-62012/51781-0; 2012/15542-
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