9,507 research outputs found
A Fundamental Theorem for submanifolds of multiproducts of real space forms
We prove a Bonnet theorem for isometric immersions of submanifolds into the
products of an arbitrary number of simply connected real space forms. Then, we
prove the existence of associated families of minimal surfaces in such
products. Finally, in the case of , we give a
complex version of the main theorem in terms of the two canonical complex
structures of
An overview of the effect of probiotics and exercise on mood and associated health conditions
The present paper provides a review of the current knowledge relating to the health benefits of probiotics, specially focused on the effects they may have together with physical exercise on mood disorders and related chronic medical conditions. With both these conditions being a substantial contributor to the global disease burden any alternative therapy must be considered. Probiotics influence the gut microbiota through a complex network of events which can influence mechanisms leading to development of mood disorders such as depression and anxiety. Similarly, through a complex interaction between psychological and neurobiological mechanisms, exercise has been found to play a key role in mood enhancement
Minimizing makespan in flowshop with time lags
We consider the problem of minimizing the makespan in a flowshop involving
maximal and minimal time lags. Time lag constraints generalize the classical
precedence constraints between operations. We assume that such constraints are
only defined between operations of the same job. We propose a solution method
and present several extensions.Comment: 2 pages. Also available at http://hal.inria.fr/inria-0000014
An ab-initio evaluation of the local effective interactions in the familly
We used quantum chemical ab initio methods to determine the effective
parameters of Hubbard and models for the compounds (x=0
and 0.5). As for the superconducting compound we found the cobalt
orbitals above the ones by a few hundreds of meV due to the
-- hybridization of the cobalt orbitals. The correlation
strength was found to increase with the sodium content while the in-plane
AFM coupling decreases. The less correlated system was found to be the pure
, however it is still strongly correlated and very close to the Mott
transition. Indeed we found , which is the critical value for the
Mott transition in a triangular lattice. Finally, one finds the magnetic
exchanges in the layers, strongly dependant of the weak local
structural distortions
First principles calculation of the phonons modes in the hexagonal ferroelectric and paraelectric phases
The lattice dynamics of the magneto-electric compound has been
investigated using density functional calculations, both in the ferroelectric
and the paraelectric phases. The coherence between the computed and
experimental data is very good in the low temperature phase. Using group
theory, modes continuity and our calculations we were able to show that the
phonons modes observed by Raman scattering at 1200K are only compatible with
the ferroelectric space group, thus supporting the idea of a
ferroelectric to paraelectric phase transition at higher temperature. Finally
we proposed a candidate for the phonon part of the observed electro-magnon.
This mode, inactive both in Raman scattering and in Infra-Red, was shown to
strongly couple to the Mn-Mn magnetic interactions
Electronic structure of the compound from ab initio local interactions
We used fully correlated ab initio calculations to determine the effective
parameters of Hubbard and t - J models for the thermoelectric misfit compound
. As for the family the Fermi level orbitals
are the orbitals of the cobalt atoms ; the being always lower
in energy by more than 240\,meV. The electron correlation is found very large
as well as the parameters fluctuations as a function of the
structural modulation. The main consequences are a partial electrons
localization and a fluctuation of the in-plane magnetic exchange from AFM to
FM. The behavior of the Seebeck coefficient as a function of temperature is
discussed in view of the ab initio results, as well as the 496\,K phase
transition
Multidimensional Urban Segregation - Toward A Neural Network Measure
We introduce a multidimensional, neural-network approach to reveal and
measure urban segregation phenomena, based on the Self-Organizing Map algorithm
(SOM). The multidimensionality of SOM allows one to apprehend a large number of
variables simultaneously, defined on census or other types of statistical
blocks, and to perform clustering along them. Levels of segregation are then
measured through correlations between distances on the neural network and
distances on the actual geographical map. Further, the stochasticity of SOM
enables one to quantify levels of heterogeneity across census blocks. We
illustrate this new method on data available for the city of Paris.Comment: NCAA S.I. WSOM+ 201
Huellas de la dictadura en Paraguay: la polÃtica cotidiana como forma de resistencia tranquila
Metadados do Trabalho de Conclusão de Curso: Huellas de la dictadura en Paraguay: la polÃtica cotidiana como forma de resistencia tranquila, pela/o discente: Julien Marie Demelenne sob orientação: Victoria Darling do Centro de Integração e Relações Internacionais, curso de Ciência PolÃtica - Sociologia da Universidade Federal da Integração Latino-Americana (UNILA), no Repositório Institucional da UNILA (RI-UNILA).Huellas de la dictadura en Paraguay: la polÃtica cotidiana como forma de resistencia tranquil
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