Search results for " Polarization"
showing 8 items of 668 documents
Simultaneous polarization attraction and Raman amplification of a light beam in optical fibers
2012
International audience; In this paper, we demonstrate that it is possible to combine both Raman amplification and polarization attraction of a signal wave in a single optical fiber by means of a counterpropagating scheme. Experiments were performed near 1550 nm in a continuous wave regime and by means of a 10 Gbit ∕ s return-to-zero signal injected in a 20 kmlong low polarization mode dispersion optical fiber. Complete repolarization and 6.7 dB amplification of the signal wave was achieved by injecting a 850 mW, 1480 nm counterpropagating polarized pump wave.
First measurement of quarkonium polarization in nuclear collisions at the LHC
2021
The polarization of inclusive J/$\psi$ and $\Upsilon(1{\rm S})$ produced in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}=5.02$ TeV at the LHC is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through its decay to muon pairs in the rapidity region $2.5<y<4$ and measuring the polar and azimuthal angular distributions of the muons. The polarization parameters $\lambda_{\theta}$, $\lambda_{\phi}$ and $\lambda_{\theta\phi}$ are measured in the helicity and Collins-Soper reference frames, in the transverse momentum interval $2<p_{\rm T}<10$ GeV/$c$ and $p_{\rm T}<15$ GeV/$c$ for the J/$\psi$ and $\Upsilon(1{\rm S})$, respectively. The polarization parameter…
Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging
2006
International audience; In the field of industrial vision, the three-dimensional inspection of highly reflective metallic objects is still a delicate task. We deal with a new automated three-dimensional inspection system based on polarization analysis. We first present an extension of the shape-from-polarization method for dielectric surfaces to metallic surfaces. Then, we describe what we believe to be a new way of solving the ambiguity concerning the normal orientation with an active lighting system. Finally, applications to shape-defect detection are discussed, and the efficiency of the system to discriminate defects on specular metallic objects made by stamping and polishing is presente…
Analysis of FBG reflection spectra under uniform and non-uniform transverse loads
2019
Loads applied transversely on the external surface of waveguides change their circular cross-sectional geometry generating birefringence. Due to this effect the reflected spectrum of a Fibre Bragg grating (FBG) undergoes a splitting of the single peak of the Bragg wavelength. In this work, we employed the Transfer Matrix Method (TMM) for x- and y-polarized wave-modes to model the uniform FBG reflection spectra for uniform and non-uniform transverse loads. We also performed experimental measurements for two different transverse load scenarios. The load profiles chosen for these experiments were applied on the FBG sensor through a block of steel and a roll bearing pin. Then, the modelled and …
Degradacja wodorowa niestopowej stali jakościowej DC01
2016
Celem prowadzonych badań była ocena podatności stali DC01 na niszczenie wodorowe. Badania odporności stali DC01 na niszczące działanie wodoru zrealizowano w oparciu o próbę statycznego rozciągania (slow strain) próbek w powietrzu oraz po polaryzacji katodowej. Wodorowanie stali zrealizowano w wodnym roztworze 0,1N kwasu siarkowego(VI) z dodatkiem 2 mg/dm3 tlenku arsenu(III) jako promotora wnikania wodoru przy gęstości prądu 10 i 20 mA/cm2 w czasie od 3 do 24 godzin. Zawartość wodoru w stali przed oraz po procesie elektrolitycznego nawodorowania oznaczono przy użyciu analizatora LECO ONH836. Przedmiotem szczegółowej analizy były wyniki badań mechanicznych, natomiast ich uzupełnieniem ocena m…
Transport and extraction of radioactive ions stopped in superfluid helium
2003
A new approach to convert a high energy beam to a low energy one, which is essential for the next generation radioactive ion beam facilities, has been proposed and tested at Jyvaskyla, Finland. An open Ra-223 alpha-decay-recoil source has been used to produce radioactive ions in superfluid helium. The alpha spectra demonstrate that the recoiling Rn-219 ions have been extracted out of liquid helium. This first observation of the extraction of heavy positive ions across the superfluid helium surface was possible thanks to the high sensitivity of radioactivity detection. An efficiency of 36% was obtained for the ion extraction out of liquid helium. (C) 2003 Elsevier Science B.V. All rights res…
A Telemetry, Tracking, and Command Antennas System for Small-Satellite Applications
2019
Circularly polarized (CP) antennas are used in space applications for telemetry tracking and command (TT&
Feminisma loma Dienvidkorejā un tā ietekme uz Korejas sabiedrību 21. gadsimtā
2020
Darba nosaukums ir “Feminisma loma Dienvidkorejā un tā ietekme uz Korejas sabiedrību 21. gadsimtā’’. Saistībā ar 21. gadsimtā Korejas sabiedrībā pieaugošajiem protestiem par dzimumu jautājumiem, darbā tiks apskatīta feminisma lomas nozīmība Dienvidkorejā un tā radītās sekas. Autore vēlas atzīmēt, ka 21. gadsimts ir nodrošinājis jaunajam feminisma vilnim valstī daudz skaļāku un drosmīgāku formu, kas uz Korejas tradicionālo vērtību fona vēl vairāk polarizē dzimumus. Darba mērķis ir aplūkot un izanalizēt, kā jaunais feminisma vilnis valstī ir izraisījis sabiedrības reakciju dzimumu līdztiesības jautājumos, un tā nozīmīgumu īpaši šodien. Izšķiroša uzmanība tiek pievērsta abu dzimumu viedokļiem,…