Search results for "orbit"
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Highly Sensitive Polarization Rotation Measurement through a High‐Order Vector Beam Generated by a Metasurface
2020
The precise determination of the polarization state of light is fundamental for a vast variety of applications in remote sensing, astronomy, optics and terahertz technology, to name just a few. Typically, polarization characterization is performed by using a combination of multiple optical devices such as beam splitters, polarizers, and waveplates. Moreover, to achieve high-precision, balanced photodetectors and lock-in amplifiers are employed, thus contributing to increasing system complexity. Here, a technique for polarization rotation measurements with a dynamic range of 180° and a sensitivity of about 10−2 degrees is realized using a properly designed metasurface. Such device generates …
Structure and dynamics in liquid bismuth and Bin clusters: A density functional study
2014
Density functional/molecular dynamics simulations with more than 500 atoms have been performed on liquid bismuth at 573, 773, 923, and 1023 K and on neutral Bi clusters with up to 14 atoms. There are similar structural patterns (coordination numbers, bond angles, and ring patterns) in the liquid and the clusters, with significant differences from the rhombohedral crystalline form. We study the details of the structure (structure factor, pair, and cavity distribution functions) and dynamical properties (vibration frequencies, diffusion constants, power spectra), and compare with experimental results where available. While the three short covalent bonds typical to pnictogens are characteristi…
Dažādu autoimūnas orbitopātijas ārstēšanas taktiku izvērtējums pacientiem ar Greivsa orbitopātiju
2017
Greivsa slimība ir relatīvi bieži sastopama endokrinoloģiska patoloģija un Greivsa orbitopātija ir visbiežākā šīs slimības izpausme ārpus vairogdziedzera. Greivsa orbitopātija ir saistīta ar būtisku dzīves kvalitātes pasliktināšanos un tā var būt par iemeslu redzes zudumam, tādēļ būtiska ir adekvāta šīs slimības ārstēšana. Pētījuma uzdevumi bija noskaidrot, vai glikokortikoīdu terapija tiek piemērota pacientiem ar klīniski aktīvu Greivsa slimību (atbilstoši slimības vēsturēs fiksētajiem simptomiem un pazīmēm), kādi ir glikokortikoīdu ievades ceļi un kādas ir to ievades shēmas. Tāpat uzdevums bija salīdzināt 2000.g. un 2015.,2016. gadā pielietotās terapijas stratēģijas un izstrādāt ieteikumu…
Conformational investigation of alpha,beta-dehydropeptides. IX. N-Acetyl-(E)-alpha,beta-methylamide: stereoelectronic properties from infrared and th…
1998
The Fourier transform infrared spectra of Ac-(E)-deltaAbu-NHMe were analyzed to determine the predominant solution conformation(s) of this (E)-alpha,beta-dehydropeptide-related compound and the electron density perturbation in its amide groups. The measurements were performed in dichloromethane and acetonitrile in the region of mode vs (N-H), amide I, amide II and vs (C(alpha)=Cbeta). The equilibrium geometrical parameters, calculated by a method based on the density functional theory with the B3LYP functional and the 6-31G* basis set, were used to support spectroscopic interpretation and gain some deeper insight into the molecule. The experimental and theoretical data were compared with th…