The primordial abundances of the light nuclides produced by Big Bang Nucleosynthesis (BBN) during the first 20 minutes in the evolution of the Universe are sensitive to the universal density of baryons and to the expansion rate of the early Universe. For example, while deuterium is an excellent baryometer, helium-4 provides an accurate chronometer. Some 400 kyr later, when the cosmic background...

AIM The aim of the present study was to compare the resistance to cyclic fatigue of Hyflex® (Coltene-Whaledent, Allstatten, Switzerland) size 40 taper.04 nickel titanium instruments used in continuous rotation versus the use with a reciprocating motion. The null hypothesis was that different file motions had no influence on the lifetime of instruments subjected to a cyclic fatigue test. METHO...

We report Sr isotope anomalies in two Ca·Al-rich inclusions (EKl-4-1 and Cl) of the Allende meteoritewhichalsocontainanomaliesin 0, Mg, Ca, Ba, Nd and Sm. The Sr effects correspond to 84 Sr or 88 Sr deficits of 3.2"too and 0.8%o or to 86 Sr excesses of 1.6%o and 0.4"too. Although it cannot be ascertained in which isotope the anomalies reside, arguments based on the 8 7 Sr abundance indicate tha...

The aim of this study was to investigate the possible beneficial effects of regular physical activity on auditory reaction time and the duration of hearing in congenital visually impaired adolescents by examining some auditory performances involving perception and motor components. Forty visually impaired and 30 sighted-control adolescents, 10 to 22 years old (14.04 ± 2.77) participated in the ...

PURPOSE To verify whether the number of chewing strokes and the chewing time are influenced by dentofacial deformities in habitual free mastication. METHODS Participants were 15 patients with diagnosis of class II dentofacial deformity (GII), 15 with class III (GIII), and 15 healthy control individuals with no deformity (CG). Free habitual mastication of a cornstarch cookie was analyzed, cons...

In this work we perform an observational data analysis on the $f(R,T)$ gravity with aim of constraining parameter space model. Five different models are considered and 30 point $z-H(z)$ cosmic chronometer is used in our analysis. The $\chi^2$ statistic formulated as a difference between theoretical observed values $H(z)$ for redshift $z$. Efforts have been made to minimize order get best fit fr...

In this work, we explore how modified gravity theories based on the non-metricity scalar, known as $f(Q)$ gravity, affect propagation of gravitational waves from inspiraling binary systems. We discuss forecast constraints by considering standard siren events in two contexts: i) simulated sources black hole - neutron star systems, emitting frequency band third-generation detector represented Ein...

Thousands of debris dangerous to personnel are generated during controlled explosion warheads containing explosives. To ensure the safety people, it is necessary define a zone in which people can stay without risking their lives. A major focus modern engineering maximize operating technical equipment. In order implement above, determine kinetic energy fragments, for safe level below 17 joules (...