AIMS: The properties of the broad-band emission from the high-frequency peaked BL Lac H 2356-309 (z=0.165) are investigated. METHODS: Very High Energy (VHE; E > 100 GeV) observations of H 2356-309 ...were performed with the High Energy Stereoscopic System (HESS) from 2004 through 2007. Simultaneous optical/UV and X-ray observations were made with the XMM-Newton satellite on June 12/13 and June 14/15, 2005. NRT radio observations were also contemporaneously performed in 2005. ATOM optical monitoring observations were also made in 2007. RESULTS: A strong VHE signal, ~13 sigma total, was detected by HESS after the four years HESS observations (116.8 hrs live time). The integral flux above 240 GeV is I(>240 GeV) = (3.06 +- 0.26 {stat} +- 0.61 {syst}) x 10^{-12} cm^{-2} s^{-1}, corresponding to ~1.6% of the flux observed from the Crab Nebula. A time-averaged energy spectrum is measured from 200 GeV to 2 TeV and is characterized by a power law (photon index of Gamma = 3.06 +- 0.15 {stat} +- 0.10 {syst}). Significant small-amplitude variations in the VHE flux from H 2356-309 are seen on time scales of months and years, but not on shorter time scales. No evidence for any variations in the VHE spectral slope are found within these data. The XMM-Newton X-ray measurements show a historically low X-ray state, characterized by a hard, broken-power-law spectrum on both nights. CONCLUSIONS: The broad-band spectral energy distribution (SED) of the blazar can be adequately fit using a simple one-zone synchrotron self-Compton (SSC) model. In the SSC scenario, higher VHE fluxes could be expected in the future since the observed X-ray flux is at a historically low level.
The method of molecular dynamics is used to study phase transitions and ion transport phenomena in uranium dioxide nanocrystals. The temperature dependences of uranium and oxygen diffusion ...coefficients in the range from 2280 to 3950
K are calculated separately for surface, near-surface and bulk regions of the crystals. On these dependences we have distinguished temperature intervals, which correspond to crystalline phase, superionic state and melt. The activation energies of diffusion and pre-exponential factors for these intervals are determined. The obtained results are compared with experimental data and calculations of other authors.
Jouravliova Anna, Nekrassov Vsevolod, Bonaque Maria-luisa. Romance cruelle d'Eldar Riazanov Un film «librement inspiré de ...» La Fille sans dot Réflexions sur Alexandre Ostrovski au cinéma. In: ...Revue Russe n°56, 2021. De tout faire théâtre. Alexandre Ostrovski (1823-1886) pp. 277-286.
Abstract In order to investigate a potential anticonvulsive action of sertraline (i.p.), its effects on seizures, EEG epileptiform activity and EEG amplitude increases induced by two convulsive ...agents were evaluated and compared with the effects of carbamazepine. Around 20 min following 4-aminopyridine (4-AP, 2.5 mg/kg, i.p.), tonic-clonic seizures and epileptiform activity were observed in control animals. A single sertraline pre-injection of 2.5 mg/kg, but not of 0.75 mg/kg, prevented these changes to 4-AP. Repeated daily administration of 0.75 mg/kg for one week, however, effectively inhibited the changes induced by 4-AP. The first generalized tonic-clonic seizure and EEG changes in response to pentylenetetrazole (PTZ, 50 mg/kg, i.p.) were observed near the first minute in control animals. Single sertraline doses above 5 mg/kg prevented the PTZ-induced changes. Moreover, a single carbamazepine dose of 25 mg/kg (i.p.), but not of 15 mg/kg, prevented the changes induced by the above convulsive agents. An anti-seizure action of the antidepressant sertraline is strongly suggested by these findings.
Nékrassov Victor, Aucouturier Michel. Deux lettres de Le Corbusier à Victor Nékrassov. In: Cahiers du monde russe et soviétique, vol. 21, n°2, Avril-Juin 1980. pp. 201-207.
