1,296 research outputs found
MamÃferos del Wealdiense de Uña, cerca de Cuenca
En esta nota preliminar se dan a conocer los hallazgos realizados en el Wealdiense de Uña, en la provincia de Cuenca corresponidientes a diversos mamÃferos niesozoicos que se integran dentro de los grupos de los Pantoterios y los Multituberculados. Este es el segundo yacimiento de España de mamÃferos secutidarios, siendo el primero el de Galve, en la provincia de Teruel. La descripción definitiva de los materiales será realizada por cada cada uno de los dos firmantes; por el primero, el de Uña y por el segundo, el de Galve
A high-current hollow cathode as a source of intense line radiation in the VUV
The VUV line emission of a high-current DC hollow cathode was investigated in the wavelength region 10 nm to 100 nm. Spectra of quadruply ionised atoms could be observed. The radiance in the Al IV lines at 13 nm and 16 nm and in the He II Lyman-series was determined by a comparison with the spectral concentration of radiant intensity of the synchrotron radiation emitted by the electron storage ring BESSY. The authors found the radiance of the lines to be reproducible within +or-25%
Circular dichroism of magneto-phonon resonance in doped graphene
Polarization resolved, Raman scattering response due to E phonon in
monolayer graphene has been investigated in magnetic fields up to 29 T. The
hybridization of the E phonon with only the fundamental inter Landau
level excitation (involving the n=0 Landau level) is observed and only in one
of the two configurations of the circularly crossed polarized excitation and
scattered light. This polarization anisotropy of the magneto-phonon resonance
is shown to be inherent to relatively strongly doped graphene samples, with
carrier concentration typical for graphene deposited on SiO
Electronic excitations and electron-phonon coupling in bulk graphite through Raman scattering in high magnetic fields
We use polarized magneto-Raman scattering to study purely electronic
excitations and the electron-phonon coupling in bulk graphite. At a temperature
of 4.2 K and in magnetic fields up to 28 T we observe -point electronic
excitations involving Landau bands with and with that can be selected by controlling the angular momentum of the
excitation laser and of the scattered light. The magneto-phonon effect
involving the optical phonon and -point inter Landau bands
electronic excitations with is revealed and analyzed within a
model taking into account the full dispersion. These polarization
resolved results are explained in the frame of the Slonczewski-Weiss-McClure
(SWM) model which directly allows to quantify the electron-hole asymmetry.Comment: 13 pages, 10 figure
Cavity-enhanced optical Hall effect in two-dimensional free charge carrier gases detected at terahertz frequencies
The effect of a tunable, externally coupled Fabry-P\'{e}rot cavity to
resonantly enhance the optical Hall effect signatures at terahertz frequencies
produced by a traditional Drude-like two-dimensional electron gas is shown and
discussed in this communication. As a result, the detection of optical Hall
effect signatures at conveniently obtainable magnetic fields, for example by
neodymium permanent magnets, is demonstrated. An AlInN/GaN-based high electron
mobility transistor structure grown on a sapphire substrate is used for the
experiment. The optical Hall effect signatures and their dispersions, which are
governed by the frequency and the reflectance minima and maxima of the
externally coupled Fabry-P\'{e}rot cavity, are presented and discussed. Tuning
the externally coupled Fabry-P\'{e}rot cavity strongly modifies the optical
Hall effect signatures, which provides a new degree of freedom for optical Hall
effect experiments in addition to frequency, angle of incidence and magnetic
field direction and strength
MamÃferos del Wealdiense de Uña, cerca de Cuenca
En esta nota preliminar se dan a conocer los hallazgos realizados en el Wealdiense de Uña, en la provincia de Cuenca corresponidientes a diversos mamÃferos niesozoicos que se integran dentro de los grupos de los Pantoterios y los Multituberculados. Este es el segundo yacimiento de España de mamÃferos secutidarios, siendo el primero el de Galve, en la provincia de Teruel. La descripción definitiva de los materiales será realizada por cada cada uno de los dos firmantes; por el primero, el de Uña y por el segundo, el de Galve
Measles viral load may reflect SSPE disease progression
Subacute sclerosing panencephalitis (SSPE) is a rare, slowly progressive neurological disorder caused by the persistent infection with measles virus (MV). Despite much research into SSPE, its pathology remains obscure. We examined autopsy tissues of eight SSPE patients by real time quantitative PCR, immunohistochemistry and immunoblotting to determine viral load. MV N, M and H gene RNA could be detected in the central nervous system (CNS) of all patients and in two non-CNS tissues of one patient. The viral burden between patients differed up to four-fold by quantitative PCR and corresponded with detection of MV protein. The level of both viral RNA and antigen in the brain may correlate with disease progression
How to not induce SNAs: The insufficiency of directional force.
People respond faster to smaller numbers in their left space and to larger numbers in their right space. Here we argue that movements in space contribute to the formation of spatial-numerical associations (SNAs). We studied the impact of continuous isometric forces along the horizontal or vertical cardinal axes on SNAs while participants performed random number production and arithmetic verification tasks. Our results suggest that such isometric directional force do not suffice to induce SNAs. [Abstract copyright: Copyright: © 2023 Michirev et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Electron effective mass in AlGaN alloys determined by mid-infrared optical Hall effect
The effective electron mass parameter in Si-doped AlGaN is
determined to be from mid-infrared optical Hall
effect measurements. No significant anisotropy of the effective electron mass
parameter is found supporting theoretical predictions. Assuming a linear change
of the effective electron mass with the Al content in AlGaN alloys and
for GaN, an average effective electron mass of
can be extrapolated for AlN. The analysis of mid-infrared
spectroscopic ellipsometry measurements further confirms the two phonon mode
behavior of the E(TO) and one phonon mode behavior of the A(LO) phonon
mode in high-Al-content AlGaN alloys as seen in previous Raman scattering
studies
- …