Search results for "FORCES"
showing 10 items of 141 documents
Neutral-current supernova-neutrino cross sections for 204,206,208Pb calculated by Skyrme quasiparticle random-phase approximation
2019
The present work constitutes a detailed study of neutral-current (NC) supernova-neutrino scattering off the stable even-even lead isotopes 204,206,208Pb. This is a continuation of our previous work [Almosly et al., Phys. Rev. C. 94, 044614 (2016)] where we investigated charged-current processes on the same nuclei. As in the previous work, we have adopted the quasiparticle random-phase approximation (QRPA) as the theory framework and use three different Skyrme interactions to build the involved nuclear wave functions. We test the Skyrme forces by computing the location of the lowest-order isovector spin-multipole giant resonances and comparing with earlier calculations. We have computed the …
Energy level shifts of a uniformly accelerated atom in the presence of boundary conditions
2009
We discuss the radiative level shifts of an atom moving with uniform acceleration near an infinite reflecting plate. We first consider the case of a two-level system interacting with a massless scalar field in the vacuum state. The acceleration of the two-level atom is supposed in a direction parallel to the conducting plate. We evaluate the contribution of vacuum fluctuations and of the radiation reaction field to the energy shift of the atomic levels, and discuss their behaviour as a function of the atomic acceleration and of the atom-plate distance. Then, we investigate the more general case of an hydrogen atom accelerating near a perfectly reflecting plate and interacting with the elect…
New results on the Roper resonance and the P_{11} partial wave
2008
Properties of the Roper resonance, the first scalar excitation of the nucleon, are determined. Pole positions and residues of the $P_{11}$ partial wave are studied in a combined analysis of pion- and photo-induced reactions. We find the Roper pole at $\{(1371\pm7)-i(92\pm10)\}$ MeV and an elasticity of $0.61\pm 0.03$. The largest decay coupling is found for the $N\sigma$ ($\sigma=(\pi\pi)$-$S$-wave). The analysis is based on new data on $\gamma p\to p\pi^0\pi^0$ for photons in the energy range from the two-pion threshold to 820 MeV from TAPS at Mainz and from 0.4 to 1.3 GeV from Crystal Barrel at Bonn and includes further data from other experiments. The partial wave analysis excludes the p…
The effect of swinging the arms on muscle activation and production of leg force during ski skating at different skiing speeds
2016
The study investigated the effects of arm swing during leg push-off in V2-alternate/G4 skating on neuromuscular activation and force production by the leg muscles. Nine skilled cross-country skiers performed V2-alternate skating without poles at moderate, high, and maximal speeds, both with free (SWING) and restricted arm swing (NOSWING). Maximal speed was 5% greater in SWING (P<0.01), while neuromuscular activation and produced forces did not differ between techniques. At both moderate and high speed the maximal (2% and 5%, respectively) and average (both 5%) vertical force and associated impulse (10% and 14%) were greater with SWING (all P<0.05). At high speed range of motion and angular …
Lithuanian armed forces in Ilūkstė region in 1919–1920
2006
Dalį Ilūkstės apskrities lenkų ir lietuvių karinės pajėgos okupavo 1919 m. vasarą. Lenkų valdžios įstaigos nedelsdamos įtraukė 6 apskrities rytinės dalies valsčius ir Gryvos miestą į savo valstybės sudėtį ir atsisakė svarstyti šį klausimą su Latvijos atstovais. Klausimas buvo išspręstas tiktai 1920 m. liepos pradžioje, kai dėl Raudonosios armijos puolimo lenkų kariuomenė buvo priversta pasitraukti iš Ilūkstės apskrities. Tuo pasinaudojo Latvijos pusė, tuo momentu pagal savo galimybes užimdami dalį tos teritorijos. Likusią užėmė lietuviai, kurie jau nuo 1919 m. vasaros buvo rūpimoje Ilūkstės apskrities dalyje. Nors derybose tarp Latvijos ir Lietuvos buvo deklaruota, kad sienos tarp tų valsty…
A thin absorbing layer at the center of a Fabry-Pérot interferometer
1994
The influence of a dye (Rhodamin B) dissolved in solution or adsorbed at an interface at the center of a Fabry-Perot interferometer on the transmission was investigated both experimentally and theoretically. We show that (i) spectra of extremely thin films are measurable at sub-monolayer concentration (one monolayer reduces the transmission by ≃50%), (ii) the transmission is sensitive to the location of an extremely thin film within nm range and (iii) the absorption coefficient is determined quantitatively by comparison between theory and experiment thus permitting one to estimate the local concentration. The results are relevant for the use of dye probes to monitor changes of organic inter…
Weighting non-covalent forces in the molecular recognition of C60. Relevance of concave–convex complementarity
2008
The relative contributions of several weak intermolecular forces to the overall stability of the complexes formed between structurally related receptors and [60]fullerene are compared, revealing a discernible contribution from concave–convex complementarity. Viruela Martin, Pedro Manuel, Pedro.M.Viruela@uv.es ; Viruela Martin, Rafael, Rafael.Viruela@uv.es ; Orti Guillen, Enrique, Enrique.Orti@uv.es
Zagrożenie terroryzmem oraz aspekt militarny w jego zwalczaniu
2015
Don Francisco Antonio de Salcedo y Aguirre, Marquès del Vadillo ... Intendente General de lo Político, y Militar del Exercito, y Plazas de esta And…
1713
Sign.: [ ]2 Cristus a la part superior de la 1 ̇pàg.