Abstract The Gibbs energy Δ G kp ( τ , T ) of kink pair formation on screw dislocations in bcc Nb has been determined as a function shear stress at different temperatures ⩽ 100 K using an accelerated molecular dynamics method and bond-boost potential. From ), the dependence entropy enthalpy could be obtained standard thermodynamic relations. increases with increasing stress, following phenomeno...

Dust grains play a crucial role on formation and evolution history of stars and galaxies in the early universe. We investigate the formation of dust grains in the ejecta of population III supernovae including pair–instability supernovae which are expected to occur in the early universe, applying a theory of non–steady state nucleation and grain growth. Dust formation calculations are performed ...

Time-resolved resonance Raman spectroscopy (TR3) has been used to study the effect of solvent polarity on the mechanism and nature of intermediates formed in photoinduced electron-transfer reaction between triplet flouranil ((3)FL) and tetramethylbenzene (TMB). Comparison of the TR3 spectra in polar, nonpolar, and medium polar media suggests that formation of radical anion due to electron-trans...

Physiological and behavioral consequences of formation of female-female relationships were investigated in adult squirrel monkeys. Plasma cortisol, heart rate, and behavior were evaluated during confinement in a test cage while animals were housed alone, during the first hour of isosexual pair formation, and while animals were housed as isosexual dyads. In addition, basal cortisol levels were a...

We analyze the star formation properties of a sample of 21 shell galaxies and 30 early-type galaxies members of interacting pairs, located in low density environments (Longhetti et al. 1998a, 1998b). The study is based on new models developed to interpret the information coming from ‘blue’ Hδ/FeI, H+K(CaII) and ∆4000 line-strength indices proposed by Rose (1984; 1985) and Hamilton (1985). We fi...

By using cosmological simulations, we studied the effects of galaxy interactions on the star formation activity in the local Universe. We selected galaxy pairs from the 3D galaxy distribution according to a proximity criterion. The 2D galaxy catalog was constructed by projecting the 3D total galaxy distribution and then selecting projected galaxy pairs. The analysis of the 3D galaxy pair catalo...

‎in this text we prove that in generalized shift dynamical system $(x^gamma,sigma_varphi)$‎ ‎for finite discrete $x$ with at least two elements‎, ‎infinite countable set $gamma$ and‎ ‎arbitrary map $varphi:gammatogamma$‎, ‎the following statements are equivalent‎: ‎ - the dynamical system $(x^gamma,sigma_varphi)$ is‎ li-yorke chaotic;‎ - the dynamical system $(x^gamma,sigma_varphi)$ has‎ an scr...

in the present study, a simple and sensitive extractive spectrophotometric method is described for determination of buspirone. the method is based on the reaction of buspirone and bromocresol green. the ion-pair complex was quantitatively extracted into chloroform at ph 2.3 followed by spectrophotometric determination at 415 nm. the complex was stable up to 2 days and obeyed beer's law over the...

a simple and sensitive extractive spectrophotometric method is described for determination of tropicamide. the method is based on the reaction of tropicamide and bromocresol green. the ion-paired colored complex was extracted with chloroform at ph 3. the extracted complex showed maximum absorbance at 423 nm. the complex was stable up to 2 days and obeyed beer's law over the concentration r...

It is shown how pair production itself would almost certainly prevent the astrophysical formation of macroscopic dyadospheres, hypothetical regions, extending many electron Compton wavelengths in all directions, where the electric field exceeds the critical value for microscopically rapid Schwinger pair production. Pair production is a self-regulating process that would discharge a growing elec...