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Effect of WC-10%Co-4%Cr coating on the Ti-6Al-4V alloy fatigue strength
(Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 2009-05-15) [Artigo]
High strength/weight ratio and effective corrosion resistance are primary reasons to use titanium alloys replacing steel and aluminum in some aeronautical components. However, titanium alloys have poor tribological properties, ...
Wigner distribution for a class of isospectral position-dependent mass systems
(Physica Scripta, 2008-09-01) [Artigo]
In this paper, we show how to construct a general class of non-relativistic quantum systems with position-dependent masses, which are isospectral to a given system with constant mass. Then, we use this approach in order ...
A new spin-2 self-dual model in D=2+1
(Journal of High Energy Physics, 2009-09-01) [Artigo]
There are three self-dual models of massive particles of helicity + 2 (or -2) in D = 2 + 1. Each model is of first, second, and third-order in derivatives. Here we derive a new self-dual model of fourth-order, L(SD)((4)), ...
Inconsistencies of a purported probability current in the Duffin-Kemmer-Petiau theory
(Physics Letters A, 2008-09-15) [Artigo]
The Duffin-Kemmer-Petiau (DKP) equation with a square step potential is used in a simple way with polymorphic purposes. it proves adequate to refuse a proposed new current that is currently interpreted as a probability ...
Evaluation of Electrical Properties of Lap Joints for BSCCO and YBCO Tapes
(IEEE Transactions on Applied Superconductivity, 2009-06-01) [Artigo]
The joint process between tapes of coated conductors is a critical issue for the most of the applications of high temperature superconductors (HTS). Using different fabrication techniques joints of YBCO coated superconductors ...
Fault Current Limiter Using YBCO Coated Conductor-The Limiting Factor and Its Recovery Time
(IEEE Transactions on Applied Superconductivity, 2009-06-01) [Artigo]
A fault current limiter (FCL) based on an arrangement of parallel connected high temperature superconducting tapes constituting a limiter element was designed and tested in 220 V line for a fault current peak between 1 kA ...
Radial Plasma Dynamic in Sequential Pinches
(IEEE Transactions on Plasma Science, 2009-11-01) [Artigo]
Plasma dynamic and confinement characteristics were investigated with magnetic probes in a theta pinch operating with oscillatory current waveform and hydrogen gas at pressure between 45 and 150 mtorr. Current-sheath ...
Piezoelectric behavior of SrRuO(3) buffered lanthanum modified bismuth ferrite thin films grown by chemical method
(Applied Physics Letters, 2008-10-06) [Artigo]
Lanthanum modified bismuth ferrite thin film (BLFO) of pure perovskite phase was deposited on SrRuO(3)-buffered Pt/TiO(2)/SiO(2)/Si (100) substrates by soft chemical method. (111)-preferred oriented BLFO film was coherently ...
Tomada de decisão em flexibilidade de manufatura para gerenciamento de riscos operacionais no processo produtivo industrial
(2009-03-30) [Tese de doutorado]
Observam-se, nos dias atuais, nas indústrias brasileiras, a ocorrência de inúmeros problemas que afetam direta e indiretamente seus processos produtivos e que, na maioria das vezes, são desenvolvidas ações corretivas ao ...
Automatização aplicada a lançadores de foguete de sondagem para compensação da influência dos ventos
(2007-09-11) [Tese de doutorado]
As ações do responsável pela segurança de vôo, em lançamentos de foguetes, são fundamentais para minimizar riscos relacionados à vida, ao meio ambiente e a bens materiais. Nesse contexto está incluída a atividade de cálculo ...