113 research outputs found
Flicker-noise spectroscopy in earthquake prediction research
International audienceThe problem of earthquake prediction and the methods of identification of geophysical precursory signals are discussed. To get information on the dynamics of earthquake preparation processes, fluctuations in geophysical time series are analyzed with the method of flicker-noise spectroscopy. Integral indices ? power spectra and various moments ("structural functions") ? are used as information relations. We demonstrate that the method allows us to reveal earthquake precursors
Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D" layer
The Earth's lower mantle is believed to be composed mainly of (Mg,Fe)SiO3
perovskite, with lesser amounts of (Mg,Fe)O and CaSiO3). But it has not been
possible to explain many unusual properties of the lowermost 150 km of the
mantle (the D" layer) with this mineralogy. Here, using ab initio simulations
and high-pressure experiments, we show that at pressures and temperatures of
the D" layer, MgSiO3 transforms from perovskite into a layered CaIrO3-type
post-perovskite phase. The elastic properties of the post-perovskite phase and
its stability field explain several observed puzzling properties of the D"
layer: its seismic anisotropy, the strongly undulating shear-wave discontinuity
at its top and possibly the anticorrelation between shear and bulk sound
velocities.Comment: PUBLISHED IN Nature 430, 445-448 (2004
Characteristics of the secondary electrons calibration beam of the accelerator S-25R "Pakhra"
The characteristics of the secondary electrons` calibration
quasi-monochromatic beam of the accelerator S-25R "Pakhra" of the Lebedev
Physical Institute of the Russian Academy of Sciences (LPI) on the basis of
magnet SP-57 are presented. With an electron energy in the range of 45-280 MeV,
a collimator diameter in front of the trigger counters of 3 mm and copper
Converter thicknesses of 1-3 mm, the energy resolution and beam intensity were
4.4-2.2% and around 16 e/sec, respectively
Creation and decay of eta-mesic nuclei
First experimental results on photoproduction of eta-mesic nuclei are
analyzed. In an experiment performed at the 1 GeV electron synchrotron of the
Lebedev Physical Institute, correlated pi+n pairs arising from the reaction
gamma + 12C -> N + eta(A-1) -> N + pi+ + n + (A-2) and flying transversely to
the photon beam have been observed. When the photon energy exceeds the
eta-meson production threshold, a distribution of the pi+n pairs over their
total energy is found to have a peak in the subthreshold region of the
internal-conversion process eta p -> pi+ n which signals about formation of
eta-mesic nuclei.Comment: 6 pages, 6 figures. Talk at CIPANP, May 2000, Quebe
The Carina Flare: What can fragments in the wall tell us?
CO(J=2--1) and CO(J=2--1) observations of the molecular cloud
G285.90+4.53 (Cloud~16) in the Carina Flare supershell (GSH287+04-17) with the
APEX telescope are presented. With an algorithm DENDROFIND we identify 51
fragments and compute their sizes and masses. We discuss their mass spectrum
and interpret it as being the result of the shell fragmentation process
described by the pressure assisted gravitational instability - PAGI. We
conclude that the explanation of the clump mass function needs a combination of
gravity with pressure external to the shell.Comment: 19 pages, 14 figures, accepted by A&
Clinical, morphological and molecular biological examination of the myocardium in COVID-19 patients
The presence of coronavirus-associated myocarditis remains controversial despite elevations in cardiac troponin and natriuretic peptide in many patients.Aim. To assess the morphological changes in the myocardium of patients who died due to coronavirus disease 2019 (COVID-19) and compare them with the intravital level of cardiac biomarkers.Material and methods. A total of 420 hospital charts and 77 autopsies of those who died from COVID-19 were analyzed. In 15 of 77 cases (19%) with histologically suspected myocarditis, an immunohistochemical examination of the myocardium with antibodies to CD3, CD45, CD8, CD68, CD34, Ang1, VWF, VEGF, HLA-DR, MHC1, C1q, VP1 of enteroviruses was performed, and in 8 patients with immunohistochemically confirmed myocarditis (10%) — polymerase chain reaction for SARS-CoV-2.Results. Hemorrhage, intramural thrombosis, necrosis of non-coronary origin, myocardial infarction and lymphocytic myocarditis were detected in 43%, 10%, 17%, 19% and 10% of cases, respectively, without coronavirus N and E gene sequences in the myocardium. Dysplasia, hyperplasia and hypertrophy of the vascular endothelium, expression of Ang1, VWF, VEGF, MHC1, C1q, VP1 of enteroviruses were determined in 100, 100, 87, 100, 75 and 62% of cases of myocarditis, respectively. There were no significant correlations between inflammatory biomarkers and myocarditis.Conclusion. The main morphological manifestation of COVID-19 in the myocardium is the so-called endotheliitis with dysplasia and endothelial activation, leading to hemorrhages, intramural thrombosis and necrosis. There is no convincing evidence of a direct involvement of coronavirus in myocarditis induction
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