59,282 research outputs found
Formal models for component connectors
Rutten, J.J.M.M. [Promotor]Arbab, F. [Promotor]Niqui, M. [Copromotor]Clarke, D.G. [Copromotor
Academic discourse and narratives of literacy as 'equipment for living'
In his article "Academic Discourse and Narratives of Literacy as 'Equipment for Living'" Kris Rutten discusses practices of academic discourse and argues that students entering higher education have to become part of a specific community of institutional discourse. Rutten claims that narratives of and about literacy — narratives that revolve around issues dealing with language and the acquisition of literacy — "dramatize" the tension of moving from one discourse community to another. By charting situations of "type," fictional literacy narratives can be used by students as "equipment for living" in order to reflect on confrontations and difficulties they experience in higher education. Kenneth Burke's "dramatistic pentad" is introduced as an analytical tool to study representations and interpretations of institutional discourse in fictional narratives. In a case study, the popular literacy narrative Educating Rita is analyzed and confronted with personal reflections of students. Further, Rutten discusses what can be learned from a rhetorical perspective on literacy about roles (identities) and language (institutional discourses) in higher education
Interplanetary Consequences of a Large CME
We analyze a coronal mass ejection (CME) which resulted from an intense flare
in active region AR486 on November 4, 2003. The CME propagation and speed are
studied with interplanetary scintillation images, near-Earth space mission
data, and Ulysses measurements. Together, these diverse diagnostics suggest
that the internal magnetic energy of the CME determines its interplanetary
consequences.Comment: 5 pages, 9 figures, To appear in "Magnetic Coupling between the
Interior and the Atmosphere of the Sun", eds. S.S. Hasan and R.J. Rutten,
Astrophysics and Space Science Proceedings, Springer-Verlag, Heidelberg,
Berlin, 200
Coalgebraic Modelling : Applications in Automata theory and Modal logic
Rutten, J.J.M.M. [Promotor]Venema, Y. [Copromotor]Kupke, C.A. [Copromotor
Academic Discourse and Literacy Narratives as Equipment for Living
In his article Academic Discourse and Narratives of Literacy as \u27Equipment for Living\u27 Kris Rutten discusses practices of academic discourse and argues that students entering higher education have to become part of a specific community of institutional discourse. Rutten claims that narratives of and about literacy — narratives that revolve around issues dealing with language and the acquisition of literacy — dramatize the tension of moving from one discourse community to another. By charting situations of type, fictional literacy narratives can be used by students as equipment for living in order to reflect on confrontations and difficulties they experience in higher education. Kenneth Burke\u27s dramatistic pentad is introduced as an analytical tool to study representations and interpretations of institutional discourse in fictional narratives. In a case study, the popular literacy narrative Educating Rita is analyzed and confronted with personal reflections of students. Further, Rutten discusses what can be learned from a rhetorical perspective on literacy about roles (identities) and language (institutional discourses) in higher education
SINFONI Observations of Starclusters in Starburst Galaxies
We have used ESO's new NIR IFS SINFONI during its Science Verification period
to observe the central regions of local starburst galaxies. Being Science
Verification observations, the aim was two-fold: to demonstrate SINFONI's
capabilities while obtaining information on the nature of starclusters in
starburst galaxies. The targets chosen include a number of the brighter
clusters in NGC1808 and NGC253. Here we present first results.Comment: Submitted to "Adaptive Optics-Assisted Integral-Field Spectroscopy",
Rutten R.G.M., Benn C.R., Mendez J., eds., May 2005, La Palma (Spain), New
Astr. Re
Spectropolarimetry with CRISP at the Swedish 1-m Solar Telescope
CRISP (Crisp Imaging Spectro-polarimeter), the new spectropolarimeter at the
Swedish 1-m Solar Telescope, opens a new perspective in solar polarimetry. With
better spatial resolution (0.13") than Hinode in the Fe I 6302 A line and
similar polarimetric sensitivity reached through postprocessing, CRISP
complements the SP spectropolarimeter onboard Hinode. We present some of the
data which we obtained in our June 2008 campaign and preliminary results from
LTE inversions of a pore containing umbral dots.Comment: To appear in "Magnetic Coupling between the Interior and the
Atmosphere of the Sun", eds. S.S. Hasan and R.J. Rutten, Astrophysics and
Space Science Proceedings, Springer-Verlag, Heidelberg, Berlin, 200
Horizontal supergranule-scale motions inferred from TRACE ultraviolet observations of the chromosphere
We study horizontal supergranule-scale motions revealed by TRACE observation
of the chromospheric emission, and investigate the coupling between the
chromosphere and the underlying photosphere. A highly efficient
feature-tracking technique called balltracking has been applied for the first
time to the image sequences obtained by TRACE (Transition Region and Coronal
Explorer) in the passband of white light and the three ultraviolet passbands
centered at 1700 {\AA}, 1600 {\AA}, and 1550 {\AA}. The resulting velocity
fields have been spatially smoothed and temporally averaged in order to reveal
horizontal supergranule-scale motions that may exist at the emission heights of
these passbands. We find indeed a high correlation between the horizontal
velocities derived in the white-light and ultraviolet passbands. The horizontal
velocities derived from the chromospheric and photospheric emission are
comparable in magnitude. The horizontal motions derived in the UV passbands
might indicate the existence of a supergranule-scale magnetoconvection in the
chromosphere, which may shed new light on the study of mass and energy supply
to the corona and solar wind at the height of the chromosphere. However, it is
also possible that the apparent motions reflect the chromospheric brightness
evolution as produced by acoustic shocks which might be modulated by the
photospheric granular motions in their excitation process, or advected partly
by the supergranule-scale flow towards the network while propagating upward
from the photosphere. To reach a firm conclusion, it is necessary to
investigate the role of granular motions in the excitation of shocks through
numerical modeling, and future high-cadence chromospheric magnetograms must be
scrutinized.Comment: 5 figures, accepted by Astronomy & Astrophysic
The Quiet-Sun Photosphere and Chromosphere
The overall structure and the fine structure of the solar photosphere outside
active regions are largely understood, except possibly important roles of a
turbulent near-surface dynamo at its bottom, internal gravity waves at its top,
and small-scale vorticity. Classical 1D static radiation-escape modelling has
been replaced by 3D time-dependent MHD simulations that come closer to reality.
The solar chromosphere, in contrast, remains ill-understood although its
pivotal role in coronal mass and energy loading makes it a principal research
area. Its fine structure defines its overall structure, so that hard-to-observe
and hard-to-model small-scale dynamical processes are the key to understanding.
However, both chromospheric observation and chromospheric simulation presently
mature towards the required sophistication. The open-field features seem of
greater interest than the easier-to-see closed-field features.Comment: Accepted for special issue "Astrophysical Processes on the Sun" of
Phil. Trans. Royal Soc. A, ed. C. Parnell. Note: clicking on the year in a
citation opens the corresponding ADS abstract page in the browse
Testing the Equivalence of Regular Languages
The minimal deterministic finite automaton is generally used to determine
regular languages equality. Antimirov and Mosses proposed a rewrite system for
deciding regular expressions equivalence of which Almeida et al. presented an
improved variant. Hopcroft and Karp proposed an almost linear algorithm for
testing the equivalence of two deterministic finite automata that avoids
minimisation. In this paper we improve the best-case running time, present an
extension of this algorithm to non-deterministic finite automata, and establish
a relationship between this algorithm and the one proposed in Almeida et al. We
also present some experimental comparative results. All these algorithms are
closely related with the recent coalgebraic approach to automata proposed by
Rutten
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