129 research outputs found
Murcha-de-Phytomonas do coqueiro: uma ameaça à cultura no Amazonas.
Ocorrência. Sintomas. Disseminação. Controle. Controle dos insetos vetores.bitstream/item/122321/1/Folder-murcha-de-phytomonas.pd
Projeto: Monitoramento da incidência e prevalência do Moko bananeira no Estado do Amazonas.
bitstream/item/180950/1/FOL-9560-4.pd
Initial Systematic Investigations of the Landscape of Low Layer NAHE Extensions
The discovery that the number of physically consistent string vacua is on the
order of 10^500 has prompted several statistical studies of string
phenomenology. Contained here is one such study that focuses on the Weakly
Coupled Free Fermionic Heterotic String (WCFFHS) formalism. Presented are
systematic extensions of the well-known NAHE (Nanopoulos, Antoniadis, Hagelin,
Ellis) set of basis vectors, which have been shown to produce
phenomenologically realistic models. Statistics related to the number of
U(1)'s, gauge group factors, non-Abelian singlets, ST SUSYs, as well as the
gauge groups themselve are discussed for the full range of models produced as
well as models containing GUT groups only. Prior results of other large-scale
investigations are compared with these regarding the aforementioned quantities.
Statistical coupling between the gauge groups and the number of ST SUSYs is
also discussed, and it was found that for order-3 extensions there are more
models with enhanced ST SUSY when there is an exceptional group present. Also
discussed are some three-generation GUT models found in the data sets. These
models are unique because they come from basis vectors which still have a
geometric interpretation -- there are no "rank-cuts" in these models.Comment: 65 Pages, 31 Tables, 31 Figure
The N=1 superstring as a topological field theory
By "untwisting" the construction of Berkovits and Vafa, one can see that the
N=1 superstring contains a topological twisted N=2 algebra, with central charge
c^ = 2. We discuss to what extent the superstring is actually a topological
theory.Comment: 8 Pages (LaTeX). TAUP-2155-9
First Report of an OXA-23 Carbapenemase-Producing Acinetobacter baumannii Clinical Isolate Related to Tn2006 in Spain
A carbapenem-resistant Acinetobacter baumannii clinical isolate belonging to European clone II and sequence type 2 was recov-ered from a patient in the Son Espases hospital in Mallorca, Spain. Genetic analysis showed the presence of the bla OXA-23 gene in association with the widely disseminated transposon Tn2006. This is the first reported identification of A. baumannii carrying bla OXA-23 in Spain
Some Simple Criteria for Gauged R-parity
We catalog some simple conditions which are sufficient to guarantee that
R-parity survives as an unbroken gauged discrete subgroup of the continuous
gauge symmetry in certain supersymmetric extensions of the standard model.Comment: 11 pages, UFIFT-HEP-92-22. v2: TeX formatting fixed, no other change
Sigatoka-negra - doença quarentenária no Estado do Amazonas.
Em feveiro de 1998 observou-se nos bananais, às margens do Rio Solimões, a ocorrência de uma nova doença incidindo de forma severa em folhas, inclusive nos plátanos 'Pacovi' e 'Pacovã'
Ocorrência de viroses em bananais no Estado do Amazonas.
Objetivando avaliar a incidência de viroses em bananais do Amazonas, visitaram-se áreas produtoras da cultura em alguns municípios do Estado
Many faces of low mass neutralino dark matter in the unconstrained MSSM, LHC data and new signals
If all strongly interacting sparticles (the squarks and the gluinos) in an
unconstrained minimal supersymmetric standard model (MSSM) are heavier than the
corresponding mass lower limits in the minimal supergravity (mSUGRA) model,
obtained by the current LHC experiments, then the existing data allow a variety
of electroweak (EW) sectors with light sparticles yielding dark matter (DM)
relic density allowed by the WMAP data. Some of the sparticles may lie just
above the existing lower bounds from LEP and lead to many novel DM producing
mechanisms not common in mSUGRA. This is illustrated by revisiting the above
squark-gluino mass limits obtained by the ATLAS Collaboration, with an
unconstrained EW sector with masses not correlated with the strong sector.
Using their selection criteria and the corresponding cross section limits, we
find at the generator level using Pythia, that the changes in the mass limits,
if any, are by at most 10-12% in most scenarios. In some cases, however, the
relaxation of the gluino mass limits are larger (). If a subset of
the strongly interacting sparticles in an unconstrained MSSM are within the
reach of the LHC, then signals sensitive to the EW sector may be obtained. This
is illustrated by simulating the \etslash, , and \etslash signals in i) the light stop scenario and ii) the light
stop-gluino scenario with various light EW sectors allowed by the WMAP data.
Some of the more general models may be realized with non-universal scalar and
gaugino masses.Comment: 27 pages, 1 figure, references added, minor changes in text, to
appear in JHE
Situação atual da bananicultura no Estado do Amazonas. I. Aspectos fitotécnicos.
Dentre os problemas fitotécnicos mais importantes na bananicultura destacam-se a utilização de cultivares suscetíveis às principais doenças da bananeira, o uso de mudas de má qualidade, tanto no aspecto fitotécnico como fitossanitário, manejo inadequado da cultura, sem a utilização de tecnologias mínimas para condução dos bananais, etc
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