Página 1 dos resultados de 211 itens digitais encontrados em 0.012 segundos

Planeamento estratégico de marketing territorial e perspectivas de desenvolvimento na Região Autónoma da Madeira

Barros, Cristina Isabel Faria
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
26.02%
Num contexto em que se assiste à crescente concorrência global entre os territórios pela captação de recursos susceptíveis de incentivar o desenvolvimento (investimentos, moradores, turistas, eventos, entre outros), o planeamento estratégico ancorado a uma perspectiva de marketing territorial assume-se como uma ferramenta de gestão territorial extremamente útil e actual no processo de constituição de uma imagem eficaz do território, de modo a que se torne mais apelativa para os públicos pretendidos. Face aos condicionalismos inerentes ao quadro de inserção territorial da Região Autónoma da Madeira (insularidade, ultraperiferia, descontinuidade territorial) e, em paralelo, às oportunidades de desenvolvimento que a mesma encerra, efectua-se um diagnóstico multi-sectorial e avalia-se a percepção dos residentes e turistas relativamente às dinâmicas de desenvolvimento, qualidade de vida e satisfação global do território. Num último momento avalia-se de que maneira a Região Autónoma, enquanto destino turístico de qualidade reconhecida, tem projectado os seus produtos turísticos e através de que canais é difundida a imagem da Região. Por fim, é valorizado um instrumento de planeamento, procurando avaliar em que medida o planeamento estratégico de marketing territorial poderá contribuir para estruturar o território internamente e o integrar em espaços mais vastos...

Registro de variações ambientais dos últimos 3000 anos da Região da Ria do Mamanguá, Rio de Janeiro, utilizando marcadores orgânicos moleculares; Environmental changes of the past 3000 years in the Region of Ria do Mamanguá, Rio de Janeiro, using molecular organic markers

Spera, Amanda Mattosinhos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 14/11/2012 PT
Relevância na Pesquisa
26.02%
O presente trabalho utilizou os marcadores orgânicos moleculares (n-alcanos e alquenonas) para avaliar as mudanças no regime pluvial do continente adjacente e na temperatura da superfície do mar nos últimos 3000 anos na Região da Ria do Mamanguá, localizada no litoral sul do Rio de Janeiro. Foram analisadas também amostras de sedimentos superficiais marinhos para verificar a extensão da influência continental na área de estudo. Os resultados das amostras de sedimento superficial mostraram haver uma maior influência terrestre nas áreas mais internas do Saco do Mamanguá e da Enseada de Parati-Mirim, que recebem do continente a matéria orgânica proveniente da Serra do Mar através dos deságues dos rios e da produção dos manguezais. Já os pontos mais externos encontram-se sob uma maior influência da produtividade marinha da plataforma continental adjacente. Os parâmetros avaliados nos testemunhos permitiram a identificação de períodos com maior ou menor contribuição de matéria orgânica terrestre para a Região da Ria do Mamanguá, indicando assim períodos relativamente mais úmidos ou mais secos, respectivamente. Além disso, foi possível identificar nos dados a presença do evento Little Ice Age, caracterizado como um período mais úmido e com TSM relativamente mais baixa na região da Ria do Mamanguá.; The present study used molecular organic markers (n-alkanes and alkenones) to assess changes in rainfall patterns and in the sea surface temperature over the past 3000 years in the Region of Ria do Mamanguá...

Implementation of the Water Framework Directive in an outermost EU region : the case of Azores archipelago

Cruz, J. Virgílio; Pacheco, Dina; Costa, Sérgio; Melo, Carla; Cymbron, Raquel; Nogueira, R.; Brito, A. G.
Fonte: Bentham Open Publicador: Bentham Open
Tipo: Artigo de Revista Científica
Publicado em //2012 ENG
Relevância na Pesquisa
46.3%
The Azores Water Plan (AWP) came to force in year 2003 in order to provide a coherent set of measures to protect and enhance water resources in the archipelago. The AWP was developed according to EU Water Framework Directive (WFD) and a close relationship can be found between goals on both documents. The evaluation of results associated to AWP implementation, made possible through a consultation procedure described in the present paper, provides an indirect assessment of the implementation of the WFD in an EU outermost region such as the Azores. The analysis suggests that major constrains to the full implementation of the AWP and WFD are associated with administrative arrangements, reflected in a lack of coordination, as well as adequate funding and cost recovery and strategies for public participation and information provision. Instead, water quality monitoring is already fully operational showing a strong relationship between science and water policy.

Isolamento e caracterização do amido de castanha

Cruz, Bruno Tiago Rodrigues
Fonte: Universidade de Trás-os-Montes e Alto Douro Publicador: Universidade de Trás-os-Montes e Alto Douro
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
26.02%
Dissertação de Mestrado em Biotecnologia e Qualidade Alimentar; Neste trabalho foi desenvolvido um método suave de isolamento do amido de castanha envolvendo o descasque da castanha, a despelagem, o corte e a liofilização dos frutos de forma a diminuir o seu conteúdo de água e aumentar a sua estabilidade em termos de transformações físico-químicas e bioquímicas. Após liofilização as castanhas foram moídas, embebidas na solução de extracção (solução aquosa contendo 25 mM de bissulfito de sódio) e maceradas durante 1h à temperatura ambiente. Após este período, a mistura foi homogeneizada num homogeneizador Waring durante 3 min à potência máxima. O amido foi purificado por sedimentação, sendo o sobrenadante separado do depósito de amido e a mucilagem castanha presente na superfície removida. Este procedimento foi repetido oito vezes até não se observar a formação da camada mucilaginosa na superfície. O rendimento da purificação foi dependente da variedade de castanha e variou entre 50 a 70%, tendo sido obtido com elevado grau de pureza dado o seu elevado teor de amido, 80 a 93%, baixo teor em proteína (0,4 a 0,6%) e baixo teor de amido danificado (11 a 30%). O amido isolado das quatro variedades de castanha apresentou uma cristalinidade do tipo B. O grau de cristalinidade é dependente da percentagem de humidade dos amidos...

Jurisdiction and economic competitiveness in a european outermost region : the case of the Autonomous Region of Madeira

Correia, Miguel Silva Pinto
Fonte: Instituto Superior de Economia e Gestão Publicador: Instituto Superior de Economia e Gestão
Tipo: Dissertação de Mestrado
Publicado em /07/2012 ENG
Relevância na Pesquisa
56.37%
Master in International Economics and European Studies; Madeira, which is an Autonomous Region of Portugal and an Outermost Region of the EU, is currently facing problems regarding the sustainability of the Regional Government’s finances. The Government of the Republic was asked to provide assistance in exchange for the implementation of an austerity plan. Madeira’s International Business Center, encompassed by the International Business Center and the Industrial Free Trade Zone created in the 80s, is considered by the Regional Government as a powerful mechanism to increase economic growth, attract FDI and generate fiscal revenue in a period where the “contraction of the [Portuguese] economic activity is unprecedented”. As the power of regional authorities are limited by para-constitutional law, full fiscal autonomy from the mainland is non-existent, therefore cannot be used as a jurisdictional tool to promote development. What is its impact on the RAM’s budget, as the fiscal regime can be improved to decrease budget dependence from the Portuguese central government while maintaining the current supply of public goods and services by the Regional Government? Being an explanatory and argumentative thesis, it aims to come up with a policy proposal regarding what can be done to improve the archipelago’s economy through the Center; methodologically consisting of literature review...

A política de coesão da União Europeia para o periodo 2014-2020 e as regiões ultraperiféricas: o caso da Região autónoma da Madeira

Barreto, Zélia Liduina Caires
Fonte: Instituto Superior de Ciências Sociais e Políticas Publicador: Instituto Superior de Ciências Sociais e Políticas
Tipo: Dissertação de Mestrado
Publicado em 24/01/2014 POR
Relevância na Pesquisa
46.27%
Tese de Mestrado em Gestão e Políticas Públicas; A Região Autónoma da Madeira, enquanto Região Ultraperiférica (RUP), tem beneficiado do apoio do Fundo Europeu de Desenvolvimento Regional (FEDER), ao abrigo da política de coesão da União Europeia (UE). Este trabalho propôs-se identificar a forma de apoio da UE à Madeira, e a esta enquanto RUP, no âmbito da proposta de Regulamento do FEDER para o período de programação financeira 2014-2020, comparativamente ao Regulamento do FEDER, no período de programação 2007-2013. Concluiu-se que as alterações substanciais relacionam-se com o alinhamento da política de coesão com a Estratégia Europa 2020 e com a classificação da Madeira como região mais desenvolvida. Constatou-se uma mudança no paradigma de desenvolvimento da RAM, por um lado, em decorrência das orientações europeias e, por outro lado, em consequência das condicionantes do Programa de Ajustamento Económico de Portugal e do Programa de Ajustamento Económico e Financeiro da Madeira. A estratégia de desenvolvimento da Madeira para o horizonte 2020 compreende a intervenção do FEDER nas áreas da competitividade da economia, do desenvolvimento sustentável, da investigação, do desenvolvimento tecnológico e da inovação. Na perspetiva da europeização das políticas públicas regionais...

Effects of Temperature and Dietary Lipids on Phospholipid Fatty Acids and Membrane Fluidity in Steinernema carpocapsae

Fodor, A.; Dey, I.; Farkas, T.; Chitwood, D. J.
Fonte: Society of Nematologists Publicador: Society of Nematologists
Tipo: Artigo de Revista Científica
Publicado em /09/1994 EN
Relevância na Pesquisa
26.18%
The phospholipid composition of Steinernema carpocapsae was studied in relation to diet and culture temperature. When reared at 18 and 27.5 C on Galleria mellonella or on an artificial diet supplemented with lard, linseed oil, or fish oil as lipid sources, nematode phospholipids contained an abundance of 20-carbon polyunsaturated fatty acids, with eicosapentaenoic acid (20:5(n - 3)) predominant, regardless of the fatty acid composition of the diet. Because the level of linolenic acid (18:3(n - 3)) in nematode phospholipids was very low and because eicosapentaenoic acid was present even when its precursor (linolenic acid) was undetectable in the diet, S. carpocapsae likely produces n - 3 polyunsaturated fatty acids by de novo biosynthesis, a pathway seldom reported in eukaryotic animals. Reduction of growth temperature from 25 to 18 C increased the proportion of 20:5(n - 3) but not other polyunsaturated fatty acids. A fluorescence polarization technique revealed that vesicles produced from phospholipids of nematodes reared at 18 C were less ordered than those from nematodes reared at 27.5 C, especially in the outermost region of the bilayer. Dietary fish oil increased fluidity in the outermost region but increased rigidity in deeper regions. Therefore...

Three-Dimensional Structure of the M-region (Bare Zone) of Vertebrate Striated Muscle Myosin Filaments by Single-Particle Analysis

AL-Khayat, Hind A.; Kensler, Robert W.; Morris, Edward P.; Squire, John M.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em 12/11/2010 EN
Relevância na Pesquisa
26.07%
The rods of anti-parallel myosin molecules overlap at the centre of bipolar myosin filaments to produce an M-region (bare zone) that is free of myosin heads. Beyond the M-region edges, myosin molecules aggregate in a parallel fashion to yield the bridge regions of the myosin filaments. Adjacent myosin filaments in striated muscle A-bands are cross-linked by the M-band. Vertebrate striated muscle myosin filaments have a 3-fold rotational symmetry around their long axes. In addition, at the centre of the M-region, there are three 2-fold axes perpendicular to the filament long axis, giving the whole filament dihedral 32-point group symmetry. Here we describe the three-dimensional structure obtained by a single-particle analysis of the M-region of myosin filaments from goldfish skeletal muscle under relaxing conditions and as viewed in negative stain. This is the first single-particle reconstruction of isolated M-regions. The resulting three-dimensional reconstruction reveals details to about 55 Å resolution of the density distribution in the five main nonmyosin densities in the M-band (M6′, M4′, M1, M4 and M6) and in the myosin head crowns (P1, P2 and P3) at the M-region edges. The outermost crowns in the reconstruction were identified specifically by their close similarity to the corresponding crown levels in our previously published bridge region reconstructions. The packing of myosin molecules into the M-region structure is discussed...

Microscopic Study of 16O-16O Interaction by the Resonating Group Method

Tohsaki, Akihiro; Tanabe, Fumiya; Tamagaki, Ryozo
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
EN
Relevância na Pesquisa
25.99%
A new method for constructing the kernels of the resonating group formulation in analytic way is presented in the 16O+16O system, where the harmonic oscillator (0s)4 (0p)12 configuration is assumed for the 16O ground state. The real phase shifts calculated from a simple effective two-nucleon potential are compared with those given by the phenomenological potential. The predicted resonance energies as well as the energy eigenvalues obtained in the bound-state approximation show the rotational feature similar to the energy surfaces given by the generator coordinate method. The behavior of the relative wave functions shows that the 16O-16O interaction is characterized by the following three regions: In the innermost region (relative distance r ≲3.8 fm) the inner oscillation is completely demped due to the dominance of the Pauli principle, in the outermost region (r ≳5 fm) related to a few important surface partial waves the potential picture is valid and in the intermediate region (3.8 ≲r ≲5 fm) the effects of nuclear forces and the Pauli principle equally play important roles.

A Region Void of Irregular Satellites Around Jupiter

Haghighipour, N.; Jewitt, D.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 23/05/2008
Relevância na Pesquisa
26.06%
An interesting feature of the giant planets of our solar system is the existence of regions around these objects where no irregular satellites are observed. Surveys have shown that, around Jupiter, such a region extends from the outermost regular satellite Callisto, to the vicinity of Themisto, the innermost irregular satellite. To understand the reason for the existence of such a satellite-void region, we have studied the dynamical evolution of Jovian irregulars by numerically integrating the orbits of several hundred test particles, distributed in a region between 30 and 80 Jupiter-radii, for different values of their semimajor axes, orbital eccentricities, and inclinations. As expected, our simulations indicate that objects in or close to the influence zones of the Galilean satellites become unstable because of interactions with Ganymede and Callisto. However, these perturbations cannot account for the lack of irregular satellites in the entire region between Callisto and Themisto. It is suggested that at distances between 60 and 80 Jupiter-radii, Ganymede and Callisto may have long-term perturbative effects, which may require the integrations to be extended to times much longer than 10 Myr. The interactions of irregular satellites with protosatellites of Jupiter at the time of the formation of Jovian regulars may also be a destabilizing mechanism in this region. We present the results of our numerical simulations and discuss their applicability to similar satellite void-regions around other giant planets.; Comment: 21 pages...

Are there thin accretion disks?

Filho, Cesar Meirelles; Lima, Celso Luiz; Miyake, Hideaki
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
25.94%
Total and internal energy requirements set constraints on the allowable temperature on the disk. In a gas pressure dominated disk, they lead to a cooling rate that decreases with temperature. These findings are used to show that the flow is mildly supersonic, with the azimuthal Mach number moderately exceeding one in a large extent of the disk. Only in the narrow outermost region, of about 12% of the disk extent, the Mach number greatly exceeds one. It is also shown that, under most favorable conditions, radiation can, at the most, transport 20% of the heat produced, close to the inner radius. Far away, under the same conditions, this efficiency can rise to 100%. This result depends only on boundary conditions, being independent of the accretion rate and mass of the central object.The geometrical thin disk approximation is violated everywhere in the disk, except in the narrow region where, under the unlikely assumption of thermodynamical equilibrium or, at least, local equilibrium, the flow is indeed supersonic.; Comment: 17 pages; uses AASTeX v5.0; submitted to ApJ

Orientation Effects on the Inner Region of Dusty Torus of Active Galactic Nuclei

Kawaguchi, Toshihiro; Mori, Masao
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 27/10/2010
Relevância na Pesquisa
25.99%
A sublimation process governs the innermost region of the dusty torus of active galactic nuclei. However, the observed inner radius of the torus is systematically smaller than the expected radius by a factor of ~ 1/3. We show that the anisotropy of the emission from accretion disks resolves this conflict naturally and quantitatively. An accretion disk emits lesser radiation in the direction closer to its equatorial plane (i.e., to the torus). We find that the anisotropy makes the torus inner region closer to the central black hole and concave. Moreover, the innermost edge of the torus may connect with the outermost edge of the disk continuously. Considering the anisotropic emission of each clump in the torus, we calculate the near-infrared flux variation in response to a UV flash. For an observer at the polar angle theta_obs = 25 deg, the centroid of the time delay is found to be 37% of the delay expected in the case of isotropic illumination, which explains the observed systematic deviation.; Comment: 5 pages, 3 figures, Accepted for publication in ApJL

Application of three-body stability to globular clusters: I. The stability radius

Kennedy, Gareth F.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
25.94%
The tidal radius is commonly determined analytically by equating the tidal field of the galaxy to the gravitational potential of the cluster. Stars crossing this radius can move from orbiting the cluster centre to independently orbiting the galaxy. In this paper, the stability radius of a globular cluster is estimated using a novel approach from the theoretical standpoint of the general three-body problem. This is achieved by an analytical formula for the transition radius between stable and unstable orbits in a globular cluster. A stability analysis, outlined by Mardling, is used here to predict the occurrence of unstable stellar orbits in the outermost region of a globular cluster in a distant orbit around a galaxy. It is found that the eccentricity of the cluster-galaxy orbit has a far more significant effect on the stability radius of globular clusters than previous theoretical results of the tidal radius have found. A simple analytical formula is given for determining the transition between stable and unstable orbits, which is analogous to the tidal radius for a globular cluster. The stability radius estimate is interior to tidal radius estimates and gives the innermost region from which stars can random walk to their eventual escape from the cluster. The time-scale for this random walk process is also estimated using numerical three-body scattering experiments.; Comment: 13 pages...

X-ray Emitting Groups in the Infall Region of Abell 2199

Rines, K.; Mahdavi, A.; Geller, M. J.; Diaferio, A.; Mohr, J. J.; Wegner, G.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 06/02/2001
Relevância na Pesquisa
25.99%
Using a large redshift survey covering 95 square degrees, we demonstrate that the infall region of Abell 2199 contains Abell 2197, one or two X-ray emitting groups, and up to five additional groups identified in redshift surveys. Our survey shows that the X-ray emitting systems, located at projected radii of $1.^\circ4, 1.^\circ9$, and $5.^\circ1$ (2.2, 3.1, and $8.0 h^{-1}$Mpc), are connected kinematically to A2199. A2197 is itself an optically rich cluster; its weak X-ray emission suggests that it is much less massive than A2199. The absence of a sharp peak in the infall pattern at the position of A2197 supports this hypothesis. The outermost group is well outside the virial region of A2199 and it distorts the infall pattern in redshift space. The two X-ray emitting groups are roughly colinear, suggesting the existence of an extended ($8.0 h^{-1}$Mpc) filament. The identification of these infalling groups provides direct support of hierarchical structure formation; studies of these systems will provide insights into structure evolution. Groups in the infall regions of nearby clusters may offer a unique probe of the physics of the warm/hot ionized medium (WHIM) which is difficult to observe directly with current instruments.; Comment: 11 pages...

Bubbles in Planetary Nebulae and Clusters of Galaxies: Instabilities at Bubble Fronts

Soker, Noam
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 15/12/2003
Relevância na Pesquisa
25.94%
I study the stability of off-center low-density more or less spherical (fat) bubbles in clusters of galaxies and in planetary nebulae (PNs) to Rayleigh-Taylor (RT) instability. As the bubble expands and decelerates, the interface between the low-density bubble's interior and the dense shell formed from the accreted ambient medium is RT-stable. If, however, in a specific direction the density decreases such that this segment is accelerated by the pressure inside the bubble, then this accelerated region is RT-unstable. The outermost region, relative to the center of the system, is the most likely to become unstable because there the density gradient is the steepest. Using simple analytical analysis, I find that off-center fat bubbles in PNs are much less stable than in clusters. In PNs bubbles become unstable when they are very small relative to their distance from the center; they can be stabilized somewhat if the mass loss rate from the stellar progenitor decreases for a time, such that the negative density gradient is much shallower. In clusters fat bubbles become unstable when their size is comparable to their distance from the center. I discuss some implications of this instability in clusters and in PNs.; Comment: New Astronomy...

Solar Nebula Magnetohydrodynamics

Balbus, Steven A.; Hawley, John F.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 18/06/1999
Relevância na Pesquisa
25.99%
The dynamical state of the solar nebula depends critically upon whether or not the gas is magnetically coupled. The presence of a subthermal field will cause laminar flow to break down into turbulence. Magnetic coupling, in turn, depends upon the ionization fraction of the gas. The inner most region of the nebula ($\lesssim 0.1$ AU) is magnetically well-coupled, as is the outermost region ($\gtrsim 10$ AU). The magnetic status of intermediate scales ($\sim 1$ AU) is less certain. It is plausible that there is a zone adjacent to the inner disk in which turbulent heating self-consistently maintains the requisite ionization levels. But the region adjacent to the active outer disk is likely to be magnetically ``dead.'' Hall currents play a significant role in nebular magnetohydrodynamics. Though still occasionally argued in the literature, there is simply no evidence to support the once standard claim that differential rotation in a Keplerian disk is prone to break down into shear turbulence by nonlinear instabilities. There is abundant evidence---numerical, experimental, and analytic---in support of the stabilizing role of Coriolis forces. Hydrodynamical turbulence is almost certainly not a source of enhanced turbulence in the solar nebula...

Pareto Boundary of the Rate Region for Single-Stream MIMO Interference Channels: Linear Transceiver Design

Cao, Pan; Jorswieck, Eduard A.; Shi, Shuying
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
25.94%
We consider a multiple-input multiple-output (MIMO) interference channel (IC), where a single data stream per user is transmitted and each receiver treats interference as noise. The paper focuses on the open problem of computing the outermost boundary (so-called Pareto boundary-PB) of the achievable rate region under linear transceiver design. The Pareto boundary consists of the strict PB and non-strict PB. For the two user case, we compute the non-strict PB and the two ending points of the strict PB exactly. For the strict PB, we formulate the problem to maximize one rate while the other rate is fixed such that a strict PB point is reached. To solve this non-convex optimization problem which results from the hard-coupled two transmit beamformers, we propose an alternating optimization algorithm. Furthermore, we extend the algorithm to the multi-user scenario and show convergence. Numerical simulations illustrate that the proposed algorithm computes a sequence of well-distributed operating points that serve as a reasonable and complete inner bound of the strict PB compared with existing methods.; Comment: 16 pages, 9 figures. Accepted for publication in IEEE Tans. Signal Process. June. 2013

Reconstruction of the Structure of Accretion Disks in Dwarf Novae from the Multi-Band Light Curves of Early Superhumps

Uemura, M.; Kato, T.; Ohshima, T.; Maehara, H.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
26.42%
We propose a new method to reconstruct the structure of accretion disks in dwarf novae using multi-band light curves of early superhumps. Our model assumes that early superhumps are caused by the rotation effect of non-axisymmetrically flaring disks. We have developed a Bayesian model for this reconstruction, in which a smoother disk-structure tends to have a higher prior probability. We analyzed simultaneous optical and near-infrared photometric data of early superhumps of the dwarf nova, V455 And using this technique. The reconstructed disk has two flaring parts in the outermost region of the disk. These parts are responsible for the primary and secondary maxima of the light curves. The height-to-radius ratio is h/r=0.20-0.25 in the outermost region. In addition to the outermost flaring structures, flaring arm-like patterns can be seen in an inner region of the reconstructed disk. The overall profile of the reconstructed disk is reminiscent of the disk structure that is deformed by the tidal effect. However, an inner arm-like pattern, which is responsible for the secondary minimum in the light curve, cannot be reproduced only by the tidal effect. It implies the presence of another mechanism that deforms the disk structure. Alternatively...

On the origin of H_2CO abundance enhancements in low-mass protostars

Schöier, F. L.; Jørgensen, J. K.; van Dishoeck, E. F.; Blake, G. A.
Fonte: EDP Sciences Publicador: EDP Sciences
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /04/2004
Relevância na Pesquisa
25.99%
High angular resolution H_2CO 218 GHz line observations have been carried out toward the low-mass protostars IRAS 16293-2422 and L1448-C using the Owens Valley Millimeter Array at ~2" resolution. Simultaneous 1.37 mm continuum data reveal extended emission which is compared with that predicted by model envelopes constrained from single-dish data. For L1448-C the model density structure works well down to the 400 AU scale to which the interferometer is sensitive. For IRAS 16293-2422 , a known proto-binary object, the interferometer observations indicate that the binary has cleared much of the material in the inner part of the envelope, out to the binary separation of ~800 AU. For both sources there is excess unresolved compact emission centered on the sources, most likely due to accretion disks ≾200 AU in size with masses of ≳0.02 M_☉ (L1448-C) and ≳0.1 M_☉ (IRAS 16293-2422). The H_2CO data for both sources are dominated by emission from gas close to the positions of the continuum peaks. The morphology and velocity structure of the H_2CO array data have been used to investigate whether the abundance enhancements inferred from single-dish modelling are due to thermal evaporation of ices or due to liberation of the ice mantles by shocks in the inner envelope. For IRAS 16293-2422 the H_2CO interferometer observations indicate the presence of rotation roughly perpendicular to the large scale CO outflow. The H_2CO distribution differs from that of C^(18)O...

Sistemas de Controlo de Gestão nas PMEs dos Açores e seus determinantes

Medeiros, Miguel Botelho Tomé de
Fonte: Instituto Superior de Economia e Gestão Publicador: Instituto Superior de Economia e Gestão
Tipo: Dissertação de Mestrado
Publicado em //2012 POR
Relevância na Pesquisa
46.18%
Mestrado em Contabilidade, Fiscalidade e Finanças Empresariais; O presente trabalho empírico tem por finalidade identificar os fatores determinantes da adoção e do grau de utilização dos Sistemas de Controlo de Gestão (SCG) por parte das PME?s dos Açores, fazendo a ponte entre a Teoria da Contingência e a Teoria Institucional, em geral, e entre a incerteza da envolvente e a formação do diretor financeiro, em particular. Com base em dados recolhidos através de um inquérito por questionário, foi-nos possível corroborar as conclusões de estudos anteriores, bem como alargar o campo da literatura existente, nomeadamente por forma a abranger contextos até então inexplorados, como é o caso das Regiões Ultraperiféricas. Os resultados sugerem que, por um lado, a globalização, e por outro, a dupla insularidade dos Açores, produzem efeitos antagónicos na incerteza percecionada pelos gestores, com consequentes ramificações nos SCG adotados. De igual modo, os baixos índices de formação nas áreas de CG por parte dos diretores financeiros, derivada da escassez de oferta de ensino existente na região e dos custos acrescidos com a deslocação e manutenção em centros de ensino fora do arquipélago, explica a reduzida utilização dos SCG pelas PME?s açorianas. Apesar da originalidade e dos vários contributos teórico-práticos que o presente estudo proporciona...