in this paper we investigate the behavior of solutions, stable and unstable of the solutions a second-order rational difference equation. also we will discuss about the behavior of solutions a the rational system, we show these solutions may be stable or unstable.

this paper addresses the validity of two hypotheses concerning changes of vowel quality in persian. the theory of centralization claims that there is a strong correlation between vowel duration and vowel quality. as vowel duration is shortened in unstressed contexts, the size of the vowel inventory reduces toward the center, leading to considerable overlap between different categories and a red...

We study a system of ordinary differential equations in that is used as model both population dynamics and game theory known to exhibit heteroclinic network consisting the union four types elementary cycles. show asymptotic stability for parameter values range compatible with dynamics. obtain estimates relative attractiveness each one cycles by computing their indices. For ensuring we relate pr...

Non-statistical weak measurements yield weak values that are outside the range of eigenvalues and are not rare, suggesting that weak values are a property of every preand-post-selected ensemble. They also extend the applicability and valid regime of weak values.

Excited states of a quantum system are unstable and decay into the continuum. The dynamics of the transmission quantum signal through a two-dimensional lattice with open decay channels coupled to the continuum is treated by means of a discretized effective non-Hermitian Hamiltonian. The energies and widths are treated as real and imaginary parts of complex eingenvalues for the effective Hamilto...

Background: Nowadays, cardiovascular diseases (CVDs) are among the most common causes of mortalities worldwide. Parathyroid hormone (PTH) has an important role in the pathogenesis of CVDs. The aim of the current study was to compare serum PTH levels between patients with acute myocardial infarction (MI), unstable angina, and normal coronary function. Methods: This descriptive and analytic stud...