We address the issue of the computation of natural convection in external or partially enclosed domains, such as natural convection flow in vertical open channels or along heated vertical plates which raises the question of the proper choice of artificial boundary conditions and of their numerical implementation. To this aim we perform a singular value decomposition of the discrete Stokes opera...

We point out that argumentation presented in [Phys. Lett. A 417, 127699 (2021)], leading to the conclusion periodic systems there is a superselection principle forbidding two different Bloch states form coherent superposition of fixed phase, unjustified and false. As an example, we show operator projecting selected Wannier state can be experimentally utilized determine relative phase between su...

The Darwinian paradigm of biological evolution is based on the independence of genetic variations from selection which occurs afterwards. However, according to the phenomenon of directed mutations, some genetic variations occur mostly when the conditions favorable for their growth are created. I propose that the explanation of this phenomenon should not rely on any special 'mechanism' for the a...

3D bone reconstructions from biplanar radiographs showed an increasing interest in the last decade. Three-dimensional (3D) reconstruction process of the femur as proposed by recent works (Chaibi et al., CMBBE, 2011) relies on the identification by an operator of a few landmarks on the radiographs to initiate the procedure. Among others landmarks, the operator needs to identify the medial and la...

We introduce a method based on matrix product states (MPS) for computing spectral functions of (quasi) one-dimensional spin chains, working directly in momentum space the thermodynamic limit. simulate time evolution after applying operator to an MPS ground state by with superposition window MPS. show explicitly spin-1 Heisenberg chain that growth entanglement is smaller space, even inside two-p...

A reasonable quantum information theory for fermions must respect the parity superselection rule to comply with special of relativity and no-signaling principle. This restricts possibility any state have a superposition between even- odd-parity fermionic states. thereby characterizing set physically allowed Here we introduce operations, in congruence rule, that map states onto itself. We first ...

A variety of coherent states of the harmonic oscillator is considered. It is formed by a particular superposition of canonical coherent states. In the simplest case, these superpositions are eigenfunctions of the annihilation operator A = P (d/dx + x)/ √ 2, where P is the parity operator. Such A arises naturally in the q → −1 limit for a symmetry operator of a specific self-similar potential ob...

We investigate some of the basic features of the interaction of superpositions of coherent states of light with two-level atoms in the framework of the Jaynes-Cummings model . We compare the behaviour of the system in the case of having a coherent superposition state and a statistical mixture of coherent states as an initial field . We investigate the collapses and revivals of the atomic invers...