2,413 research outputs found
Breadth-first serialisation of trees and rational languages
We present here the notion of breadth-first signature and its relationship
with numeration system theory. It is the serialisation into an infinite word of
an ordered infinite tree of finite degree. We study which class of languages
corresponds to which class of words and,more specifically, using a known
construction from numeration system theory, we prove that the signature of
rational languages are substitutive sequences.Comment: 15 page
Instituciones internacionales y el Derecho Internacional del Medio Ambiente: La contribución del Banco Mundial
Superconductivity as a Bose-Einstein condensation?
Bose-Einstein condensation (BEC) in two dimensions (2D) (e.g., to describe
the quasi-2D cuprates) is suggested as the possible mechanism widely believed
to underlie superconductivity in general. A crucial role is played by nonzero
center-of-mass momentum Cooper pairs (CPs) usually neglected in BCS theory.
Also vital is the unique {\it linear} dispersion relation appropriate to
weakly-coupled "bosonic" CPs moving in the Fermi sea--rather than in vacuum
where the dispersion would be quadratic but only for very strong coupling, and
for which BEC is known to be impossible in 2D.Comment: 6 pages included 3 figure
Spectrogram classification using dissimilarity space
In this work, we combine a Siamese neural network and different clustering techniques to generate a dissimilarity space that is then used to train an SVM for automated animal audio classification. The animal audio datasets used are (i) birds and (ii) cat sounds, which are freely available. We exploit different clustering methods to reduce the spectrograms in the dataset to a number of centroids that are used to generate the dissimilarity space through the Siamese network. Once computed, we use the dissimilarity space to generate a vector space representation of each pattern, which is then fed into an support vector machine (SVM) to classify a spectrogram by its dissimilarity vector. Our study shows that the proposed approach based on dissimilarity space performs well on both classification problems without ad-hoc optimization of the clustering methods. Moreover, results show that the fusion of CNN-based approaches applied to the animal audio classification problem works better than the stand-alone CNNs
Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant. Design Requirements Document (DRD)
A description and the design requirements for the 200 MWe (nominal) net output MHD Engineering Test Facility (ETF) Conceptual Design, are presented. Performance requirements for the plant are identified and process conditions are indicated at interface stations between the major systems comprising the plant. Also included are the description, functions, interfaces and requirements for each of these major systems. The lastest information (1980-1981) from the MHD technology program are integrated with elements of a conventional steam electric power generating plant
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