do Nascimento, Fellype Moshkalev, Stanislav Machida, Munemasa
Published in
Brazilian Journal of Physics

Dielectric barrier discharge (DBD) plasma jets have been studied extensively in recent years because of its wide range of applications. DBD plasmas can be produced using many different gases and can be applied to a broad variety of surfaces and substrates. This work provides comparisons of DBD plasmas generated using argon (Ar), helium (He), and ni...

da Silva, G. Pordeus Cavalcanti, A. G.
Published in
Brazilian Journal of Physics

In order to clarify the tension between estimates of the Hubble Constant (H0) from local (z ≪ 1) and global (z ≫ 1) measurements, Lima and Cunha (LC) proposed a new method to measure H0 in intermediate redshifts (z ≈ 1), which were obtained H0 = 74.1 ± 2.2 km s− 1Mpc− 1 (1σ), in full agreement to local measurements via Supernovae/Cepheid dataset. H...

Ramos, José G. Rodrigues, Clóves G. Silva, Carlos A. B. Luzzi, Roberto
Published in
Brazilian Journal of Physics

Hydrodynamics, a term apparently introduced by Daniel Bernoulli (1700–1783) to comprise hydrostatic and hydraulics, has a long history with several theoretical approaches. Here, after a descriptive introduction, we present so-called mesoscopic hydro-thermodynamics, which is also referred to as higher order generalized hydrodynamics, built within th...

Moreira Jr., E. S.
Published in
Brazilian Journal of Physics

This paper investigates further how the presence of a single reflecting plane wall modifies the usual Planckian forms in the thermodynamics of the massless scalar radiation in N-dimensional Minkowski spacetime. This is done in a rather unconventional way by integrating the energy density over space to obtain the internal energy and from that the He...

Hashemi, S.
Published in
Brazilian Journal of Physics

Using Monte Carlo simulation in NVT ensemble, the behavior of hard ellipses confined in a square with hard walls, is analyzed here. Three different aspect ratios are used for confined ellipses. It is seen that confining can create especial configurations, e.g., elastic and bridge arrangements, or some defects in nematic phases. This phenomenon depe...

Oliveira, R. R. S. Sousa, M. F.
Published in
Brazilian Journal of Physics

In this work, we study the (2 + 1)-dimensional Dirac equation for a neutral fermion with magnetic dipole moment in the presence of an electromagnetic field. Next, we explicitly determine the eigenfunctions and the relativistic energy spectrum of the fermion. As result, we verified that these eigenfunctions are written in terms of the generalized La...

Samary, Dine Ousmane Guedezounme, Sêcloka Lazare Kanfon, Antonin Danvidé
Published in
Brazilian Journal of Physics

Harmonic oscillator in noncommutative two-dimensional lattice is investigated. Using the properties of non-differential calculus and its applications to quantum mechanics, we provide the eigenvalues and eigenfunctions of the corresponding Hamiltonian. First, we consider the case of ordinary quantum mechanics, and we point out the thermodynamic prop...

Mai, Bich Dung Nguyen, Hoai Thuong Ta, Dinh Hien
Published in
Brazilian Journal of Physics

In this study, a novel ferroelectric composite consisting of triglycine sulfate and cellulose nanoparticles at different weight composition ratios was successfully synthesized. A comparative study on structure and electrophysical properties for dried and wet composite samples was carried out. The measurements of electrophysical parameters were perf...

Khan, Majid Hussain, S. S. Sheng, Z. Kamran, M.
Published in
Brazilian Journal of Physics

In the fluid description of the classical Tonks-Langmuir (TL) model [Tonks and Langmuir, Phys Rev., 34: 876, 1929], arises the “closure problem.” The continuity and the momentum equations need, in addition, a closure equation. Usually, this closure equation assumes zero ion pressure (pi = 0), or a constant ion polytropic coefficient (γi). These sim...

Lima, F. N. Lima, R. P. A. Lyra, M. L.
Published in
Brazilian Journal of Physics

Using a first-order time-dependent perturbation theory, we calculate the spontaneous emission rate of a two-level system trapped between perfectly reflecting concentric spheres. The emitter is represented by a two-level monopole coupled to a Hermitian massless scalar field satisfying Dirichlet boundary conditions in such quantum-confined low-dimens...