Aços API-5CT grau K55 são especificados para tubos de revestimento poços exploração óleo e gás. Eles podem ser fabricados por laminação sem costura, seguida têmpera revenimento (processo clássico). No entanto, diversos segmentos industriais têm apontado a utilização microestruturas bifásicas (ferrita-martensita) como uma alternativa melhorar relação resistência mecânica-tenac...

In this note we present a reverse isoperimetric inequality for closed convex curves, which states that if γ is a closed strictly convex plane curve with length L and enclosing an area A, then one gets L ≤ 4π(A+ |Ã|), where à denotes the oriented area of the domain enclosed by the locus of curvature centers of γ, and the equality holds if and only if γ is a circle. MSC 2000: 52A38, 52A40

We denote by Q(A) the set of all matrices with the same sign pattern as A. A matrix A has signed null-space provided there exists a set S of sign patterns such that the set of sign patterns of vectors in the null-space of à is S for each à ∈ Q(A). Some properties of matrices with signed null-spaces are investigated.

High levels of airborne particulate matter (PM) and bacteria may exist in animal housing, which can be detrimental to the health of animals and workers. The sizes of these bioaerosols determine their aerialtransport behaviors and depositions in the respiratory tracts of animals and humans. However, little is known regarding the size distribution of airborne PM and bacteria in livestock houses, ...

The à A1← X̃ B1 transitions of H2S above the barrier to linearity have been investigated with the energy resolution high enough to identify individual rotational transition lines for the first time. The rotational cooling of the cation is achieved either by the direct ionization or mass-analyzed threshold ionization MATI technique employed in the vacuum-ultraviolet laser excitation of the jet-co...

This article presents a concise overview of Unicode 3.2 and its ISO equivalent, ISO/IEC 10646. It introduces and summarizes the main features and design principles before examining the character encoding model, normalizations forms and common processes such as sorting and rendering and their relationship with Unicode. MOTS-CLÉS : Unicode, ISO/CEI 10646, formes normalisées, modèle de caractères,...

Let f be a homeomorphism of the closed annulus A that preserves the orientation, the boundary components and that has a lift f̃ to the infinite strip à which is transitive. We show that, if the rotation numbers of both boundary components of A are strictly positive, then there exists a closed nonempty unbounded set B− ⊂ à such that B− is bounded to the right, the projection of B− to A is dense, ...

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High resolution photoelectron spectra of the n-methylvinoxide anion and its deuterated isotopologue are obtained by slow electron velocity-map imaging. Transitions between the X̃(1)A' anion ground electronic state and the radical X̃(2)A" and Ã(2)A' states are observed. The major features in the spectra are attributed to transitions involving the lower energy cis conformers of the anion and neutra...

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