20,724 research outputs found
The great good place : coworking como espaço para aprender design uma framework exploratória
Abstract : In this paper we explore a conceptual framework based on
three lines of thinking/work from Patrick Cohendet
(Underground/Middleground/Upperground), Ray Oldenburg (The Great
Good Place), and Fred Garneti (Heutagogy or Self-determined Learning).
To demonstrate the relevance and feasibility of our proposed concept, we
review the key factors and definitions of these authors and their
work. Although not a theoretical framework, the present
paper aims to help us map a part of our research work within the context
of the Doctoral Programme in Design at IADE / Universidade Europeia,
which triangulates Coworking, Design Learning, and Heutagogy or selfdetermined
modes of learning. Ultimately, the aim is to generate
new evidence on how such a model of Coworking Design Learning can
benefit and betier suit contemporary Design learners.Neste artigo, exploramos uma estrutura conceptual baseada
em três linhas de pensamento dos autores Patrick Cohendet
(Underground / Middleground / Upperground), Ray Oldenburg (The Great
Good Place) e Fred Garneti (Heutagogy or Self-determined Learning).
Para demonstrar a relevância e a viabilidade da nossa proposta
conceptual, revisitamos os principais fatores e definições destes autores e
dos seus trabalhos. Embora não constitua uma framework teórica, o
presente trabalho tem como objetivo ajudar a mapear parte do nosso
trabalho de pesquisa no contexto do Programa de Doutoramento em
Design do IADE / Universidade Europeia, que triangula Coworking,
Aprendizagem de Design e Heutagogia ou modos autodeterminados de
aprendizagem. Em última instância, o objetivo é tentar produzir novas
evidências sobre como um modelo de aprendizagem de Design baseado
em espaços de Coworking pode beneficiar e adequar-se melhor aos
actuais alunos de Design.info:eu-repo/semantics/publishedVersio
Vortex-antivortex annihilation in mesoscopic superconductors with a central pinning center
In this work we solved the time-dependent Ginzburg-Landau equations, TDGL, to
simulate two superconducting systems with different lateral sizes and with an
antidot inserted in the center. Then, by cycling the external magnetic field,
the creation and annihilation dynamics of a vortex-antivortex pair was studied
as well as the range of temperatures for which such processes could occur. We
verified that in the annihilation process both vortex and antivortex acquire an
elongated format while an accelerated motion takes place.Comment: 4 pages, 5 figures, work presented in Vortex VII
Forest vintages and carbon sequestration
In the current paper we examine the role of forest carbon sequestration benefits in optimal forest management. When carbon benefits are considered not only the forested area is relevant, but also the flow of carbon between land and the atmosphere through the carbon cycle. To account for all these impacts a multi-vintage forest setting is used, following Salo and Tahvonen (2004). The model is extended to three different carbon accounting methods to measure the benefits form carbon sequestration: carbon flow regime, tonne-year crediting and average storage. In the case of the carbon flow regime, the impact on the optimal management and allocation of land will depend upon the amount of carbon released when the forest is harvested. Under the other two accounting systems optimal steady state forest area will be increased, and in cases where optimal management imply cyclical harvesting, considering carbon benefits will always increase cycles dimension.
Radiolysis of ammonia-containing ices by energetic, heavy and highly charged ions inside dense astrophysical environments
Deeply inside dense molecular clouds and protostellar disks, the interstellar
ices are protected from stellar energetic UV photons. However, X-rays and
energetic cosmic rays can penetrate inside these regions triggering chemical
reactions, molecular dissociation and evaporation processes. We present
experimental studies on the interaction of heavy, highly charged and energetic
ions (46 MeV Ni^13+) with ammonia-containing ices in an attempt to simulate the
physical chemistry induced by heavy ion cosmic rays inside dense astrophysical
environments. The measurements were performed inside a high vacuum chamber
coupled to the heavy ion accelerator GANIL (Grand Accelerateur National d'Ions
Lourds) in Caen, France.\textit{In-situ} analysis is performed by a Fourier
transform infrared spectrometer (FTIR) at different fluences. The averaged
values for the dissociation cross section of water, ammonia and carbon monoxide
due to heavy cosmic ray ion analogs are ~2x10^{-13}, 1.4x10^{-13} and
1.9x10^{-13} cm, respectively. In the presence of a typical heavy cosmic
ray field, the estimated half life for the studied species is 2-3x10^6 years.
The ice compaction (micropore collapse) due to heavy cosmic rays seems to be at
least 3 orders of magnitude higher than the one promoted by (0.8 MeV) protons .
In the case of the irradiated H2O:NH3:CO ice, the infrared spectrum at room
temperature reveals five bands that were tentatively assigned to vibration
modes of the zwitterionic glycine (+NH3CH2COO-).Comment: Accepted to be published in Astronomy and Astrophysics; Number of
pages: 12; Number of Figures: 7; Number of Tables:
A Method to Tackle First Order Differential Equations with Liouvillian Functions in the Solution - II
We present a semi-decision procedure to tackle first order differential
equations, with Liouvillian functions in the solution (LFOODEs). As in the case
of the Prelle-Singer procedure, this method is based on the knowledge of the
integrating factor structure.Comment: 11 pages, late
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