8,790 research outputs found
Análise do custo de produção e rentabilidade da mangueira explorada na região do Submédio São Francisco.
bitstream/CPATSA/33066/1/COT123.pd
Open Space – a collaborative process for facilitating Tourism IT partnerships
The success of IT projects depends on the success of the partnerships on which they are based. However past research by the author has identified a significant rate of failure in these partnerships, predominantly due to an overly technical mindset, leading to the question: “how do we ensure that, as technological solutions are implemented within tourism, due consideration is given to human-centred issues?” The tourism partnership literature is explored for additional insights revealing that issues connected with power, participation and normative positions play a major role. The method, Open Space, is investigated for its ability to engage stakeholders in free and open debate. This paper reports on a one-day Open Space event sponsored by two major intermediaries in the UK travel industry who wanted to consult their business partners. Both the running of the event and its results reveal how Open Space has the potential to address some of the weaknesses associated with tourism partnerships
Spin-phonon coupling in Gd(Co1/2Mn1/2)O3 perovskite
We have investigated the temperature-dependent Raman-active phonons and the
magnetic properties of Gd(Co1/2Mn1/2)O3 perovskite ceramics in the temperature
range from 40 K to 300 K. The samples crystallized in an orthorhombic distorted
simple perovskite, whose symmetry belongs to the Pnma space group. The data
reveals spin-phonon coupling near the ferromagnetic transition occurring at
around 120 K. The correlation of the Raman and magnetization data suggests that
the structural order influences the magnitude of the spin-phonon coupling.Comment: 3 Figures, suplementary materia
Generalized Involution Models for Wreath Products
We prove that if a finite group has a generalized involution model, as
defined by Bump and Ginzburg, then the wreath product also has a
generalized involution model. This extends the work of Baddeley concerning
involution models for wreath products. As an application, we construct a
Gelfand model for wreath products of the form with abelian, and
give an alternate proof of a recent result due to Adin, Postnikov, and Roichman
describing a particularly elegant Gelfand model for the wreath product \ZZ_r
\wr S_n. We conclude by discussing some notable properties of this
representation and its decomposition into irreducible constituents, proving a
conjecture of Adin, Roichman, and Postnikov's.Comment: 29 page
Pustumeira: uma nova e boa opção forrageira para áreas de sequeiro.
Qualidade da pustumeira; Onde, como e quando plantar a pustumeira?; Formas de uso da pustumeira.bitstream/item/17803/1/INT90.pd
Avanços no conhecimento da diversidade de mosca-das-frutas (Diptera: Tephritidae) no município de Belém, PA.
A preocupação com a qualidade sanitária dos produtos na fruticultura tem sido fator primordial, já que muitos frutos são consumidos ?in natura?. Esta pesquisa objetivou avaliar os avanços no conhecimento da diversidade de moscas-das-frutas (Diptera: Tephritidae) e seus hospedeiros no município de Belém, Pará. Entre outubro de 2007 e junho de 2008 foram realizadas coletas de frutos em diferentes locais da base física da Embrapa Amazônia Oriental. Frutos coletados foram quantificados, pesados e processados em bandejas plásticas contendo areia esterilizada para obtenção de pupários e adultos de moscas-das-frutas e seus parasitóides. Das 27 amostras coletadas, 62,96% apresentaram-se infestadas por mosca-das-frutas e somente cinco espécies vegetais não foram infestadas. O maior índice de infestação (28,13 pupários/kg de frutos) foi constatado no hospedeiro abiu (Pouteria caimito). A espécie de moscas-das-frutas Anastrepha obliqua Macquart é a que possui maior número de hospedeiros no município de Belém, PA.PIBIC-2011
Wind reversals in turbulent Rayleigh-Benard convection
The phenomenon of irregular cessation and subsequent reversal of the
large-scale circulation in turbulent Rayleigh-B\'enard convection is
theoretically analysed. The force and thermal balance on a single plume
detached from the thermal boundary layer yields a set of coupled nonlinear
equations, whose dynamics is related to the Lorenz equations. For Prandtl and
Rayleigh numbers in the range and 10^{7} \leq
\Ra \leq 10^{12}, the model has the following features: (i) chaotic reversals
may be exhibited at Ra ; (ii) the Reynolds number based on the
root mean square velocity scales as \Re_{rms} \sim \Ra^{[0.41 ...
0.47]} (depending on Pr), and as
(depending on Ra); and (iii) the mean reversal frequency follows an effective
scaling law \omega / (\nu L^{-2}) \sim \Pr^{-(0.64 \pm 0.01)} \Ra^{0.44 \pm
0.01}. The phase diagram of the model is sketched, and the observed
transitions are discussed.Comment: 4 pages, 5 figure
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