13,632 research outputs found
Fixed Point Theorems for Set-Valued Mappings on TVS-Cone Metric Spaces
In the context of tvs-cone metric spaces, we prove a Bishop-Phelps and a
Caristi's type theorem. These results allow us to prove a fixed point theorem
for -weak contraction according to a pseudo Hausdorff metric
defined by means of a cone metric
PLEs from virtual ethnography of social web
This article presents an exploratory research based on the virtual ethnography from an environment of research and learning including new technologies. The ethnography is a method of qualitative research of social sciences that is mainly used in the socio-cultural anthropology, where it has its theoretical basis. The target was to explore the web 2.0 and its tools. The process of participant observation is by means of a blog, other tools and virtual communities. The result is a descriptive model of the web 2.0 based on a Personal Learning Environment which developed in the ethnographic experience.Postprint (published version
Glass transition in models with controlled frustration
A class of models with self-generated disorder and controlled frustration is
studied. Between the trivial case, where frustration is not present at all, and
the limit case, where frustration is present over every length scale, a region
with local frustration is found where glassy dynamics appears. We suggest that
in this region, the mean field model might undergo a p-spin like transition,
and increasing the range of frustration, a crossover from a 1-step replica
symmetry breaking to a continuous one might be observed.Comment: 4 pages, 6 figure
Deuteron properties from muonic atom spectroscopy
Leading order () finite size corrections in muonic deuterium are
evaluated within a few body formalism for the system in muonic
deuterium and found to be sensitive to the input of the deuteron wave function.
We show that this sensitivity, taken along with the precise deuteron charge
radius determined from muonic atom spectroscopy can be used to determine the
elusive deuteron D-state probability, , for a given model of the
nucleon-nucleon (NN) potential. The radius calculated with a of 4.3\% in
the chiral NN models and about 5.7\% in the high precision NN potentials is
favoured most by the data.Comment: 14 pages, 2 figure
Segregation in hard spheres mixtures under gravity. An extension of Edwards approach with two thermodynamical parameters
We study segregation patterns in a hard sphere binary model under gravity
subject to sequences of taps. We discuss the appearance of the ``Brazil nut''
effect (where large particles move up) and the ``reverse Brazil nut'' effects
in the stationary states reached by ``tap'' dynamics. In particular, we show
that the stationary state depends only on two thermodynamical quantities: the
gravitational energy of the first and of the second species and not on the
sample history. To describe the properties of the system, we generalize
Edwards' approach by introducing a canonical distribution characterized by two
configurational temperatures, conjugate to the energies of the two species.
This is supported by Monte Carlo calculations showing that the average of
several quantities over the tap dynamics and over such distribution coincide.
The segregation problem can then be understood as an equilibrium statistical
mechanics problem with two control parameters.Comment: 7 pages, 4 figure
Guess the score, fostering collective intelligence in the class
This paper proposes the use of serious games as a tool to enhance collective intelligence of undergraduate and graduate students. The development of social skills of individuals in a group is related to the performance of the collective intelligence of the group manifested through the shared and collaborative development of intellectual tasks [1]. Guess the Score GS, is a serious game implemented by means of an online tool, created to foster the development, collaboration and engagement of students. It's has been designed with the intention of facilitating the development of individual’s social skills in a group in order to promote education of collective intelligence. This paper concludes that the design of learning activities using serious games as a support tool in education, generate awareness about of utilities of gaming in the collective learning environment and the fostering of collective intelligence education.Postprint (published version
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