Dosage semi-quantitatif de l'or

LOR-OSEM: Statistical PET Reconstruction from Raw LOR Histograms

Iterative statistical reconstruction methods are becoming the standard in positron emission tomography (PET). Conventional maximum-likelihood expectation-maximization (MLEM) and ordered-subsets (OSEM) algorithms act on data which has been pre-processed into corrected, evenly-spaced histograms; however, such pre-processing corrupts the Poisson statistics. Recent advances have incorporated attenu...

Dosage de la choline en spectrophotometrie ultra-violette

Sistema de Aquisição Semi-Automática de Ontologias

This paper presents an ongoing work on ontology learning from text, focusing on the acquisition of concepts and relations. In order to do that, this work investigates approaches for ontology learning, and presents a proposal based on graphs metrics to identify concepts, and text analysis to find relations between the concepts. Resumo. Este artigo apresenta um trabalho em andamento na área de ap...

Dually quasi-De Morgan Stone semi-Heyting algebras I. Regularity

This paper is the first of a two part series. In this paper, we first prove that the variety of dually quasi-De Morgan Stone semi-Heyting algebras of level 1 satisfies the strongly blended $lor$-De Morgan law introduced in cite{Sa12}. Then, using this result and the results of cite{Sa12}, we prove our main result which gives an explicit description of simple algebras(=subdirectly irreducibles) ...

Dually quasi-De Morgan Stone semi-Heyting algebras II. Regularity

This paper is the second of a two part series. In this Part, we prove, using the description of simples obtained in Part I, that the variety $mathbf{RDQDStSH_1}$ of regular dually quasi-De Morgan Stone semi-Heyting algebras of level 1 is the join of the variety generated by the twenty 3-element $mathbf{RDQDStSH_1}$-chains and the variety of dually quasi-De Morgan Boolean semi-Heyting algebras--...