The aerospace industry is constantly looking for innovative materials that exhibit good mechanical and corrosion properties. The 2198-T851 (Al-Cu-Li) alloy was developed to replace the conventional Al-Cu-Mg in aircraft structures. Despite the usefulness of the 2198-T851 alloy, its performance may be affected when subjected to an aggressive medium containing chloride ions. The deposition of Nb2O5 coatings by using the reactive sputtering technique on the 2198-T851 alloy surface appears as a powerful tool to improve the corrosion resistance of this material. Recently, groundbreaking research findings have demonstrated the positive effect of Nb2O5 coatings on corrosion protection of alloy 2198-T851. However, the corrosion products originated from the 2198-T851 aluminium alloy are poorly understood. The use of Raman spectroscopy and XPS techniques may help to shed some light on the corrosion products of 2198-T851 alloy. Results demonstrated the corrosion products are mainly composed by CuCl2 x H2O, CuCl, Cu2Cl(OH)3, Al(OH)3, and AlO(OH).

Biomedical engineering has been constantly looking for the development of new materials that have bioactive surfaces and that are responsible for new bone formation, induce osteoblast differentiation and present antibacterial properties. Here, we present innovative and applied research to evaluate the influence of niobium pentoxide thin films (Nb2O5) deposited on the surface of a Ti-6Al-4V alloy via the reactive sputtering technique on antibacterial activity, on the cellular proliferation of MC3T3 cells and on biomineralization capacity. Results demonstrated the reactive sputtering technique improved the cell viability, the osteogenic performance of cells involved in the osseointegration process, the ability to delay bacterial proliferation within the first six hours of contact with S. aureus as well as the capacity to promote rapid amorphous apatite formation in vitro. These findings confirm the great potential of the Ti-6Al-4V alloy functionalized with Nb2O5 for future applications in implantable devices. properties Here NbO Nb O (Nb2O5 Ti6Al4V TiAlV Ti 6Al 4V Al V activity MCT MC T MC3T viability process S vitro Nb2O devices (Nb2O

We analyze the effects of dissipation in a charged oscillator in the presence of the Aharonov-Bohm effect by using time-dependent mass (m(t)) Hamiltonians. We consider two different models for the dissipative Hamiltonian and analyze the uncertainties (Δr and Δp) and the quantum mechanical expectation value of energy (⟨E⟩) in terms of time (t), damping parameters and flux parameter (v). For the Caldirola-Kanai model, we observe that the flux parameter v decreases the energy dissipation in a quantum dot for a certain range of t.

Investigamos o emaranhamento para o estado fundamental de duas partículas sem spin, carregadas e harmonicamente acopladas em uma armadilha de Penning. Encontramos uma expressão analítica para a entropia linear, L, e analisamos o grau de emaranhamento em função da variação da constante de acoplamento e dos parâmetros da armadilha de Penning. Os resultados mostram uma competição entre o acoplamento das partículas e os parâmetros da armadilha. Relacionamos os resultados com a incerteza na posição das partículas.

We investigate the entanglement-related features of the ground state of two spinless charged particles harmonically coupled in a Penning trap. We find an analytical expression for the linear entropy, L, and analyze the entanglement properties of the ground state as the trap parameters and coupling constant changes. The results show a competition between the coupling constant and trap parameters and can also be related to the uncertainty in the position of the particles.

Neste trabalho investigamos as soluções da equação de Schrödinger de osciladores com massa dependente da posição utilizando o método algébrico de operadores escada e uma transformação canônica de ponto. Os resultados são ilustrados para um sistema onde m(x) ∝ x2. De posse das funções de onda, calculamos a informação de Fisher e a entropia de Shannon para a posição e momentum de uma partícula no estado fundamental deste sistema.

In this work we investigate the solutions of the Schrödinger equation of position-dependent mass oscillators by employing the algebraic method of ladder operators and a point canonical transformation. The results are illustrated for a system where m(x) ∝ x2. From the wave functions, we calculate the Fisher information and Shannon entropy in the position and momentum for a particle in the ground state of this system.

Pulmonary lesions compatible with adenovirus infection were detected by gross and microscopic examination of autopsy tissues children aged from 5 to 34 months. Hepatic lesions indicative of systemic infection were also found in four of the chisldren. The viral etiology was confirmed in three cases by in-situ hibridization, electro-microscopy and immunofluorescence performed in parafin-embedded tissues, and in one case by cell culture isolation of adenovirus type 2 from nasopharyngeal exudate. Routine testing by methods additional to conventional light microscopy would probably have revealed a larger number of adenovirus infections among the 1.103 autopsy records analyzed in this study.

IgM específica anti-B19 foi demonstrada nos soros de três crianças apresentando aplasia transitória de medula. Um menino de dois anos de idade vivendo no Rio de Janeiro e sendo portador de anemia falciforme, apresentou a crise durante Agosto de 1990. Dois irmãos vivendo em Santa Maria - RS, desenvolveram crise de aplasia em Maio de 1991, quando foram também diagnosticados como portadores de microesferocitose. IgM anti-B19 não foi detectada no soro de uma terceira criança, desta mesma família, a qual primeiramente apresentou crise de aplasia.

Specific anti-B19 IgM was demonstrated in sera from three children showing transient aplastic crisis. A two years-old boy living in Rio de Janeiro suffering from sickle-cell anaemia showed the crisis during August, 1990. Two siblings living in Santa Maria, RS, developed aplastic crisis during May, 1991, when they were also diagnosed for hereditary spherocytosis. For a third child from this same family, who first developed aplastic crisis no IgM anti-B19 was detected in her sera.