19,519 research outputs found
Facilitating argumentative knowledge construction with computer-supported collaboration scripts
Online discussions provide opportunities for learners to engage in argumentative debate, but learners rarely formulate well-grounded arguments or benefit individually from participating in online discussions. Learners often do not explicitly warrant their arguments and fail to construct counterarguments (incomplete formal argumentation structure), which is hypothesized to impede individual knowledge acquisition. Computer-supported scripts have been found to support learners during online discussions. Such scripts can support specific discourse activities, such as the construction of single arguments, by supporting learners in explicitly warranting their claims or in constructing specific argumentation sequences, e.g., argumentâcounterargument sequences, during online discussions. Participation in argumentative discourse is seen to promote both knowledge on argumentation and domain-specific knowledge. However, there have been few empirical investigations regarding the extent to which computer-supported collaboration scripts can foster the formal quality of argumentation and thereby facilitate the individual acquisition of knowledge. One hundred and twenty (120) students of Educational Science participated in the study with a 2Ă2-factorial design (with vs. without script for the construction of single arguments and with vs. without script for the construction of argumentation sequences) and were randomly divided into groups of three. Results indicated that the collaboration scripts could improve the formal quality of single arguments and the formal quality of argumentation sequences in online discussions. Scripts also facilitated the acquisition of knowledge on argumentation, without affecting the acquisition of domainspecific knowledge
The calculus of multivectors on noncommutative jet spaces
The Leibniz rule for derivations is invariant under cyclic permutations of
co-multiples within the arguments of derivations. We explore the implications
of this principle: in effect, we construct a class of noncommutative bundles in
which the sheaves of algebras of walks along a tesselated affine manifold form
the base, whereas the fibres are free associative algebras or, at a later
stage, such algebras quotients over the linear relation of equivalence under
cyclic shifts. The calculus of variations is developed on the infinite jet
spaces over such noncommutative bundles.
In the frames of such field-theoretic extension of the Kontsevich formal
noncommutative symplectic (super)geometry, we prove the main properties of the
Batalin--Vilkovisky Laplacian and Schouten bracket. We show as by-product that
the structures which arise in the classical variational Poisson geometry of
infinite-dimensional integrable systems do actually not refer to the graded
commutativity assumption.Comment: Talks given at Mathematics seminar (IHES, 25.11.2016) and Oberseminar
(MPIM Bonn, 2.02.2017), 23 figures, 60 page
Semantic Web Techniques to Support Interoperability in Distributed Networked Environments
We explore two Semantic Web techniques arising from ITA research into semantic alignment and interoperability in distributed networks. The first is POAF (Portable Ontology Aligned Fragments) which addresses issues relating to the portability and usage of ontology alignments. POAF uses an ontology fragmentation strategy to achieve portability, and enables subsequent usage through a form of automated ontology modularization. The second technique, SWEDER (Semantic Wrapping of Existing Data sources with Embedded Rules), is grounded in the creation of lightweight ontologies to semantically wrap existing data sources, to facilitate rapid semantic integration through representational homogeneity. The semantic integration is achieved through the creation of context ontologies which define the integrations and provide a portable definition of the integration rules in the form of embedded SPARQL construct clauses. These two Semantic Web techniques address important practical issues relevant to the potential future adoption of ontologies in distributed network environments
Ehrenfest-time dependence of counting statistics for chaotic ballistic systems
Transport properties of open chaotic ballistic systems and their statistics
can be expressed in terms of the scattering matrix connecting incoming and
outgoing wavefunctions. Here we calculate the dependence of correlation
functions of arbitrarily many pairs of scattering matrices at different
energies on the Ehrenfest time using trajectory based semiclassical methods.
This enables us to verify the prediction from effective random matrix theory
that one part of the correlation function obtains an exponential damping
depending on the Ehrenfest time, while also allowing us to obtain the
additional contribution which arises from bands of always correlated
trajectories. The resulting Ehrenfest-time dependence, responsible e.g. for
secondary gaps in the density of states of Andreev billiards, can also be seen
to have strong effects on other transport quantities like the distribution of
delay times.Comment: Refereed version. 15 pages, 14 figure
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