4,399 research outputs found
Manejo do nitrogênio para o arroz Irrigado: doses e parcelamento da adubação em cobertura.
bitstream/item/30961/1/Circular-86.pd
Radion production in exclusive processes at CERN LHC
In the Randall-Sundrum (RS) scenario the compactification radius of the extra
dimension is stabilized by the radion, which is a scalar field lighter than the
graviton Kaluza-Klein states. It implies that the detection of the radion will
be the first signature of the stabilized RS model. In this paper we study the
exclusive production of the radion in electromagnetic and diffractive hadron -
hadron collisions at the LHC. Our results demonstrate that the diffractive
production of radion is dominant and should be feasible of study at CERN LHC.Comment: 6 pages, 3 figures, 1 tabl
Study of the Organic Extraction and Acidic Leaching of Chars Obtained in the Pyrolysis of Plastics, Tire Rubber and Forestry Biomass Wastes
AbstractThe present work aims to perform a characterization of chars obtained in the co-pyrolysis of waste mixtures composed by plastics, tires and pine biomass, to provide knowledge about the composition, leaching behavior and risk assessment of these materials in order to define strategies for their possible valorization or safe disposal. The chars were submitted to sequential solvent extractions with organic solvents of increasing polarity that allow the recovery of significant amounts of the pyrolysis oils trapped in the crude chars improving the yield of the pyrolysis liquids. An acidic demineralization procedure was successfully applied to the chars and high efficiency removals of the majority of the heavy metals were achieved. The demineralization study also demonstrated that hazardous heavy metals such as chromium, nickel and cadmium are significantly immobilized in the char matrix, and other heavy metals of concern such as zinc and lead will not represent a leaching problem if acidic conditions were not used. The obtained chars present sufficient quality and characteristics to be used as fuel or alternatively, to be used as adsorbents or precursors of activated carbon
Exact Foldy-Wouthuysen transformation for gravitational waves and magnetic field background
We consider an exact Foldy-Wouthuysen transformation for the Dirac spinor
field on the combined background of a gravitational wave and constant uniform
magnetic field. By taking the classical limit of the spinor field Hamiltonian
we arrive at the equations of motion for the non-relativistic spinning
particle. Two different kinds of the gravitational fields are considered and in
both cases the effect of the gravitational wave on the spinor field and on the
corresponding spinning particle may be enforced by the sufficiently strong
magnetic field. This result can be relevant for the astrophysical applications
and, in principle, useful for creating the gravitational wave detectors based
on atomic physics and precise interferometry
Envelhecimento, trabalho e tempo livre: elaborando projetos de vida.
bitstream/item/71542/1/ID-30980.pd
Contribuições para o desenvolvimento da Educação Ambiental em Unidades de Conservação no Brasil a partir de programas educativos do Geoparque Naturtejo (Portugal)
O presente trabalho pretende apresentar os resultados de estudos realizados sobre programas educativos desenvolvidos no Geoparque Naturtejo (Portugal) e avaliar se os programas podem contribuir para o desenvolvimento de programas de preservação e educação ambiental em Unidades de Conservação – UC brasileiras cuja organização e sistematização de uso e ocupação tem como base o Sistema Nacional de Unidades de Conservação (SNUC). A pesquisa envolveu pesquisa documental, entrevistas com responsáveis por programas educativos do geoparque e acompanhamento de atividades de campo. A educação ambiental (EA) desenvolvida no geoparque possui três caracterÃsticas notáveis: 1. EA naturalmente inclusiva, pois busca integrar os moradores locais; 2. Os conteúdos de EA estão integrados a conteúdos do ensino formal; 3. A EA junto à s escolas e comunidades locais é muito ativa. A EA praticada nas UC brasileiras foca somente em quem as visita, geralmente excluindo a comunidade ou escolas da região; exige-se proteção local sem que a comunidade compreenda os processos relacionados ao ambiente. Embora os objetivos e finalidades de um geoparque não sejam os mesmos definidos para as UC brasileiras, consideramos que o modelo dos programas educativos do geoparque estudado poderia ser uma proposta mais efetiva para desenvolver a educação ambiental no Brasil.CAPES pelo apoio financeiro com bolsas do programa PDSE, Doutorado SanduÃche no Exterior, e à FAPESP, Proc. 2009/01741-9.info:eu-repo/semantics/publishedVersio
Plasmonic silicon Schottky photodetectors: the physics behind graphene enhanced internal photoemission
Recent experiments have shown that the plasmonic assisted internal photoemission from a metal to
silicon can be
significantly enhanced by introducing a monolayer of graphene between the two media. This is despite the limited
absorption in a monolayer of undoped graphene (
∼
Ï€
α
=
2.3
%
). Here we propose a physical model where surface plasmon polaritons
enhance the absorption in a single-layer graphene by enhancing the field along the interface. The
relatively long relaxation time in graphene allows for multiple attempts for the carrier to overcome the
Schottky barrier
and penetrate into the semiconductor. Interface disorder is crucial to overcome the momentum
mismatch in the internal photoemission process. Our results show that quantum efficiencies in
the range of few tens of percent are obtainable under reasonable experimental assumptions.
This insight may pave the way for the implementation of compact, high efficiency
silicon based
detectors for the telecom range and beyond
A method to incorporate uncertainty in the classification of remote sensing images
The aim of this paper is to investigate if the incorporation of the uncertainty
associated with the classification of surface elements into the classification of
landscape units (LUs) increases the results accuracy. To this end, a hybrid classification
method is developed, including uncertainty information in the classification
of very high spatial resolution multi-spectral satellite images, to obtain a map
of LUs. The developed classification methodology includes the following steps: (1)
a pixel-based hard classification with a probabilistic Bayesian classifier; (2) computation
of the posterior probabilities and quantification of the classification
uncertainty using an uncertainty measure; (3) image segmentation and (4) object
classification based on decision rules. The classification of the resulting objects into
LUs is performed considering a set of decision rules that incorporate the pixelbased
classification uncertainty. The proposed methodology was tested on the
classification of an IKONOS satellite image. The accuracy of the classification was
computed using an error matrix. The comparison between the results obtained
with the proposed approach and those obtained without considering the classification
uncertainty revealed a 12% increase in the overall accuracy. This shows that
the information about uncertainty can be valuable when making decisions and can
actually increase the accuracy of the classification results.info:eu-repo/semantics/publishedVersio
Assessment of the state of conservation of buildings through roof mapping using very high spatial resolution images
The assessment of the state of conservation of buildings is extremely important in urban rehabilitation. In
the case of historical towns or city centres, the pathological characterization using traditional methods is
a laborious and time consuming procedure. This study aims to show that Very High Spatial Resolution
(VHSR) multispectral images can be used to obtain information regarding the state of conservation of
roofs where, usually, building degradation starts. The study was performed with multispectral aerial
images with a spatial resolution of 0.5 m. To extract the required information, a hybrid classification
method was developed, that integrates pixel and object based classification methods, as well as information regarding the classification uncertainty. The proposed method was tested on the classification of the historical city centre of Coimbra, in Portugal, that includes over than 800 buildings. The results were then validated with the data obtained from a study conducted during 2 years by a nine element team from the University of Coimbra, using traditional methods. The study performed achieved a global classification accuracy of 78%, which proves that the state of conservation of roofs can be obtained from VHSR multispectralimages using the described methodology with a fairly good accuracy.info:eu-repo/semantics/publishedVersio
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