22,868 research outputs found
Controle de podridões-radiculares na cultura do feijoeiro: eficácia da aplicação de fungicidas no sulco de plantio.
O controle de podridões-radiculares via tratamento de sementes tem sido errático, com históricos de sucesso e insucesso em diversas regiões produtoras de feijão. A pulverização de fungicidas no sulco de plantio, já utilizada em outras culturas, como o algodão e a batata, surge como alternativa a este tratamento padrão. Por este motivo, diversos fungicidas foram testados quanto a sua eficiência no controle de podridões radiculares via pulverização no sulco de plantio do feijoeiro.bitstream/CNPAF/19135/1/doc_118.pdfConvênio: Embrapa Arroz e Feijão e Hokko do Brasil
Compatibilidade de fungicidas e inseticidas no tratamento de sementes do feijoeiro (Phaseolus vulgaris L.) associadas ou não a polímeros: relatório técnico.
Tratamento de sementes do feijoeiro com inseticida; Revestimento de sementes do feijoeiro tratadas com inseticidas e fungicidas; Experimento I - Qualidade fisiológica e sanitária; Experimento II - Teste de campo; Experimento III - Avaliação da eficiência de controle de adultos da mosca branca, Bemisia argentifolii; Conclusão; Referências bibliográficas; Anexos..bitstream/CNPAF/19141/1/doc_125.pdfCooperação técnica: Embrapa Arroz e Feijão & Bayer S/A
Efeito da mistura de fungicidas aplicados via fungigação no controle do mofo-branco do feijoeiro comum.
Procurando otimizar a eficácia de controle, este trabalho objetivou determinar o efeito preventivo e residual de fungicidas utilizados em mistura e aplicados via fungigação para o controle do mofo-branco do feijoeiro.bitstream/CNPAF/19129/1/pqfoco62.pd
The Power Spectrum of Galaxies in the Nearby Universe
We compute the power spectrum of galaxy density fluctuations in a recently
completed redshift survey of optically-selected galaxies in the southern
hemisphere (SSRS2). The amplitude and shape of the SSRS2 power spectrum are
consistent with results of the Center for Astrophysics redshift survey of the
northern hemisphere (CfA2), including the abrupt change of slope on a scale of
30-50Mpc/h; these results are reproducible for independent volumes of space and
variations are consistent with the errors estimated from mock surveys. Taken
together, the SSRS2 and CfA2 form a complete sample of 14,383 galaxies which
covers one-third of the sky. The power spectrum of this larger sample continues
to rise on scales up to ~ 200Mpc/h, with weak evidence for flattening on the
largest scales. The SSRS2+CfA2 power spectrum and the power spectrum
constraints implied by COBE are well-matched by an Omega*h ~ 0.2,
Omega+lambda_0=1 CDM model with minimal biasing of optically-selected galaxies.Comment: Accepted for publication in The Astrophysical Journal Letters, Sept.
23, 1994. 10 pages uuencoded compressed postscript, including two figures.
JHU-9410200
Characterizing neuromorphologic alterations with additive shape functionals
The complexity of a neuronal cell shape is known to be related to its
function. Specifically, among other indicators, a decreased complexity in the
dendritic trees of cortical pyramidal neurons has been associated with mental
retardation. In this paper we develop a procedure to address the
characterization of morphological changes induced in cultured neurons by
over-expressing a gene involved in mental retardation. Measures associated with
the multiscale connectivity, an additive image functional, are found to give a
reasonable separation criterion between two categories of cells. One category
consists of a control group and two transfected groups of neurons, and the
other, a class of cat ganglionary cells. The reported framework also identified
a trend towards lower complexity in one of the transfected groups. Such results
establish the suggested measures as an effective descriptors of cell shape
What are the Best Hierarchical Descriptors for Complex Networks?
This work reviews several hierarchical measurements of the topology of
complex networks and then applies feature selection concepts and methods in
order to quantify the relative importance of each measurement with respect to
the discrimination between four representative theoretical network models,
namely Erd\"{o}s-R\'enyi, Barab\'asi-Albert, Watts-Strogatz as well as a
geographical type of network. The obtained results confirmed that the four
models can be well-separated by using a combination of measurements. In
addition, the relative contribution of each considered feature for the overall
discrimination of the models was quantified in terms of the respective weights
in the canonical projection into two dimensions, with the traditional
clustering coefficient, hierarchical clustering coefficient and neighborhood
clustering coefficient resulting particularly effective. Interestingly, the
average shortest path length and hierarchical node degrees contributed little
for the separation of the four network models.Comment: 9 pages, 4 figure
Análise da divulgação e comercialização do Curadermite: uma tecnologia gerada pela Embrapa Tabuleiros Costeiros.
O estudo mostra que o conhecimento dos produtores e extensionistas acerca dos aspectos diferenciais do Curadermite se restringiu, praticamente, à Bahia e Sergipe, estados de maior proximidade geográfica com a Embrapa Tabuleiros Costeiros, produtora do Curadermite. Por outro lado, o esforço de divulgação da tecnologia não obteve êxito nos meios acadêmico e científico onde o curadermite é praticamente desconhecido. O trabalho tem como resultado um conjunto de indicativos que podem ser utilizados na reorientação da política de divulgação e marketing de tecnologias na Embrapa.bitstream/CPATC/19761/1/bp-28.pd
2D pattern evolution constrained by complex network dynamics
Complex networks have established themselves along the last years as being
particularly suitable and flexible for representing and modeling several
complex natural and human-made systems. At the same time in which the
structural intricacies of such networks are being revealed and understood,
efforts have also been directed at investigating how such connectivity
properties define and constrain the dynamics of systems unfolding on such
structures. However, lesser attention has been focused on hybrid systems,
\textit{i.e.} involving more than one type of network and/or dynamics. Because
several real systems present such an organization (\textit{e.g.} the dynamics
of a disease coexisting with the dynamics of the immune system), it becomes
important to address such hybrid systems. The current paper investigates a
specific system involving a diffusive (linear and non-linear) dynamics taking
place in a regular network while interacting with a complex network of
defensive agents following Erd\"os-R\'enyi and Barab\'asi-Albert graph models,
whose nodes can be displaced spatially. More specifically, the complex network
is expected to control, and if possible to extinguish, the diffusion of some
given unwanted process (\textit{e.g.} fire, oil spilling, pest dissemination,
and virus or bacteria reproduction during an infection). Two types of pattern
evolution are considered: Fick and Gray-Scott. The nodes of the defensive
network then interact with the diffusing patterns and communicate between
themselves in order to control the spreading. The main findings include the
identification of higher efficiency for the Barab\'asi-Albert control networks.Comment: 18 pages, 32 figures. A working manuscript, comments are welcome
Labels for non-individuals
Quasi-set theory is a first order theory without identity, which allows us to
cope with non-individuals in a sense. A weaker equivalence relation called
``indistinguishability'' is an extension of identity in the sense that if
is identical to then and are indistinguishable, although the
reciprocal is not always valid. The interesting point is that quasi-set theory
provides us a useful mathematical background for dealing with collections of
indistinguishable elementary quantum particles. In the present paper, however,
we show that even in quasi-set theory it is possible to label objects that are
considered as non-individuals. We intend to prove that individuality has
nothing to do with any labelling process at all, as suggested by some authors.
We discuss the physical interpretation of our results.Comment: 11 pages, no figure
Controle da mela do feijoeiro com uma estrobirulina.
O objetivo deste trabalho foi verificar a eficiência de uma nova molécula de fungicida do grupo das estrobirulinas para o controle da mela do feijoeiro.bitstream/CNPAF/17258/1/pqfoco43.pd
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