Bulletin of the Lebedev Physics Institute
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Variation in magnesium isotopic composition during zone recrystallization of MgCl2·6H2O
Bulletin of the Lebedev Physics Institute - Tập 34 - Trang 352-356 - 2007
The variation in Mg isotopic composition during MgCl2·6H2O zone recrystallization was studied. It was shown that light isotope 24 Mg enrichment occurs at the crystal end to which the recrystallization zone moves. Isotopes 25 Mg and 26 Mg concentrate in the initial crystallization zone. When the molten zone is exposed to a de magnetic field or direct current, the separation factor increases. The da...... hiện toàn bộ
Thermo-Optical Bistability in a Compact High-Q Cavity at a Wavelength of 1550 nm
Bulletin of the Lebedev Physics Institute - Tập 50 - Trang 385-390 - 2023
The bistability effect caused by radiation absorption in mirrors of a compact high-Q cavity at a wavelength of 1550 nm is studied. The effect leads to a hysteresis of the cavity transmission when scanning the radiation frequency in different directions. The dependence of the effect on the cavity supplied power is studied, and the experimental data are compared with simulation results. The effect u...... hiện toàn bộ
Vicinal Growth as a Possible Structural Source of the Nematic Superconductivity in SrxBi2Se3
Bulletin of the Lebedev Physics Institute - Tập 47 - Trang 119-122 - 2020
The structure of the layered SrxBi2Se3 crystals characterized by the nematic superconductivity has been studied. It is shown that the higher the degree of the superconducting and structural nematicity, the stronger the deviation of the block boundary orientation from the crystal c axis. This indicates that the block grows at an angle to the basal planes, rather than along them. This growth can res...... hiện toàn bộ
Lasing from Molecular Nitrogen Ions at a Wavelength of 391.4 nm in Laser Plasma
Bulletin of the Lebedev Physics Institute - Tập 50 - Trang S1200-S1205 - 2024
We report results of experimental studies on spectral, temporal, energy and spatial characteristics of coherent radiation at a wavelength of 391.4 nm [
$${{B}^{2}}\Sigma _{u}^{ + }(0) - {{X}^{2}}\Sigma _{g}^{ + }(0)$$
transition of molecular nitrogen ion]. Lasing occurs in pure nitrogen...... hiện toàn bộ
Streamer Rest Mass and its Limit Velocity
Bulletin of the Lebedev Physics Institute - Tập 45 - Trang 136-140 - 2018
Based on the nonlinear plasma-waveguide model of the electrical breakdown of gases, experiments on neutron generation in electric discharge processes are considered. An analysis of these processes makes it possible to determine the lower limit of the streamer mass as 10−23 g and the existence of the upper limit of the streamer propagation at the level of 109 cm/s.
Correlation between parameters of the Fermi surface and the upper critical magnetic field Hc2 of magnesium diboride
Bulletin of the Lebedev Physics Institute - Tập 34 - Trang 90-92 - 2007
The temperature dependence of the upper critical magnetic field Hc2 of two-band MgB2 superconductor samples with various imperfection was studied. It was shown that the dependence of Hc2 on the residual resistivity can be described using theoretical concepts on the upper critical magnetic field of single-band superconductors. The parameters of the σ band rather than the entire Fermi surface consis...... hiện toàn bộ
On the collective excitations and the existence of the gap in the degenerate Bose gas spectrum
Bulletin of the Lebedev Physics Institute - Tập 37 Số 5 - Trang 145-151 - 2010
Quantification of cerebral aspartate concentration in vivo using proton magnetic resonance spectroscopy
Bulletin of the Lebedev Physics Institute - Tập 44 - Trang 56-60 - 2017
The 1Н MRS is a unique method allowing in vivo observation of concentrations of proton-containing chemical compounds in human tissues and organs. The main problem of this technique is the signal overlap caused by the similarity of structural fragments of variousmetabolites. To separate overlapped signals, the J-modulation technique for editing spectra, based on the spin–spin interaction can be use...... hiện toàn bộ
Investigation of Partially Polarized Isopachics Using a Rotating Polarizer
Bulletin of the Lebedev Physics Institute - Tập 50 - Trang 285-289 - 2023
The light field at the output of the Mach–Zehnder interferometer, where one of its arms contains a birefringent sample and a rotating polarizer is placed at the output, has been investigated both theoretically and experimentally. Initially unpolarized light, after passing through the interferometer, becomes partially polarized and carries information about the sample points with equal sums of prin...... hiện toàn bộ
Longitudinal development of electromagnetic showers in directional spectrometer
Bulletin of the Lebedev Physics Institute - Tập 39 - Trang 295-299 - 2012
The length of the longitudinal development of the electromagnetic shower induced by electrons with an energy of 26 GeV in a directional spectrometer consisting of a crystalline tungsten converter oriented along the 〈111〉 axis and a composite Cherenkov shower spectrometer is shorter in comparison with the length of the standard shower development by 20–30% at a converter thickness from 2.7 to 8.4 m...... hiện toàn bộ
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