Search results for "Enna"

Broadband printed dipole with integrated via-hole balun for WiMAX applications

2010

A broadband balanced printed dipole antenna for WiMAX applications (2.5/3.6 GHz) is presented. An integrated via-hole balun is used to feed the antenna and a Yagi-like scheme is proposed to improve the gain. The design has been optimized by means of parametric FDTD simulations. The antenna was fabricated and measured, giving a bandwidth higher than 50% and a gain higher than 4 dBi. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:52–55, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25671

Broadband space-variant Fresnel processor

2002

We present a radically new class of optical setup working with white-light illumination, namely, a chromatically compensated processor operating in the Fresnel domain. The optical configuration is a hybrid (diffractive-refractive) three-lens system that exhibits an intermediate achromatic Fresnel plane and an output image plane without chromatic distortion. As a first application of this optical arrangement we develop a parallel space-variant color pattern-recognition experiment with white light.

Noise fiber lasers

2021

In this paper, we present a brief review of the noise operation mode of fiber lasers. These lasers were studied recently by collaborative group that includes researchers, professors, and Ph.D. students from the Centro de Investigaciones en Optica, A.C. (Leon, Guanajuato, Mexico) and from the Universidad de Valencia (Valencia, Spain). Meanwhile, the pioneer works in this topic important for understanding the physics behind fiber lasers’ operation and for practical applications were done with the active participation of Dr. Evgeny Kuzin from the Instituto Nacional de Astrofisica, Optica y Electronica (Puebla, Mexico) and Dr. Georgina Beltrán-Pérez from the Benemérita Universidad Autónoma de P…

The Influence of a Magnetized Plasma Column on the Radiation Characteristics of a Strip Loop Antenna

2014

The radiation characteristics of a circular loop antenna located on the surface of an open waveguide in the form of an axially magnetized plasma column are studied using the rigorously obtained current distribution of such an antenna. The radiation resistance of the antenna excited by a time-harmonic external voltage is obtained for the case where the plasma inside the column is resonant. The distribution of the radiated power over the spatial spectrum of the excited waves is found and discussed.

Exciton description of chlorosome to baseplate excitation energy transfer in filamentous anoxygenic phototrophs and green sulfur bacteria.

2013

A description of intra-chlorosome and from chlorosome to baseplate excitation energy transfer in green sulfur bacteria and in filamentous anoxygenic phototrophs is presented. Various shapes and sizes, single and multiwalled tubes, cylindrical spirals and lamellae of the antenna elements mimicking pigment organization in chlorosomes were generated by using molecular mechanics calculations, and the absorption, LD, and CD spectra of these were predicted by using exciton theory. Calculated absorption and LD spectra were similar for all modeled antenna structures; on the contrary, CD spectra turned out to be sensitive to the size and pigment orientations in the antenna. It was observed that, bri…

Pianoforte a coda Johann Heitzmann und Sohn, Vienna 1870 c. Analisi tecnologica e contestualizzazione storica / Grand piano by Johann Heitzmann und S…

2009

Venetsian biennaali kuvataiteen kansainvälisen kentän portinvartijana ja Suomen osallistumisen problematiikka

2008

Omassa Pro gradu -tutkielmassani pureudun Suomen ja suomalaisten taiteilijoiden osallistumiseen Venetsian nykytaiteen biennaaliin, sekä siinä vallitsevaan problematiikkaan kasvavan kulttuuriviennin aikana. Seuraan mukanaolon kehitystä ja jalostumista nykyiselle tasolleen, tuoden esille sen ongelmia ja toisaalta mahdollisuuksia. Kansallisella kuvataiteen kentällä Venetsian biennaaliin osallistumiselle annetaan paljon painoarvoa, koska biennaali on yksi nykytaiteen tärkeimmistä reiteistä kansainvälisyyteen. Ongelmat eivät kuitenkaan ole pelkästään kansallisia, johtuen Suomen yhteisesiintymisestä Norjan ja Ruotsin kanssa. Tutkimuskysymyksiäni ovat: Miten määrittyy kansalliselle toimijalle bien…

INTEGRAL/SPI ground calibration

2003

Three calibration campaigns of the spectrometer SPI have been performed before launch in order to determine the instrument characteristics, such as the effective detection area, the spectral resolution and the angular resolution. Absolute determination of the effective area has been obtained from simulations and measurements. At 1 MeV, the effective area is 65 cm^2 for a point source on the optical axis, the spectral resolution ~2.3 keV. The angular resolution is better than 2.5 deg and the source separation capability about 1 deg. Some temperature dependant parameters will require permanent in-flight calibration.

Ultracompact x-ray dosimeter based on scintillators coupled to a nano-optical antenna

2017

International audience; We show that nano-optical antennas are capable of controlling the luminescence induced by the absorption of x rays into matter. The x-ray-excited luminescence from a tiny scintillation cluster coupled to a horn nano-optical antenna is highly directed and determined by the antenna’s geometrical parameters. Directionality is sufficiently high to efficiently outcouple the x-ray-excited luminescence to a narrow single-mode optical fiber, thus enabling ultracompact fiber-integrated x-ray sensors. Our nano-optically driven approach offers the possibility of x-ray profiling and dosimetry in ultra-confined environments, opening up new avenues in the fields of x-ray imaging, …

"Lato" Tadeusza Rittnera. "Ostatnie dni starej Europy" i nowoczesny teatr uczuć

2021

This is a reassessment of the work of Tadeusz Rittner, a bilingual Polish/German writer and dramatist from Galicia who won much acclaim in the early decades of the last century. This article examines his narrative and dramatic strategies by focusing on his drama Lato (Summer), published in 1913. It is a story about a timid young man who, after hearing from his doctor that he will not live much longer, turns suddenly into a bold and shameless seducer. This could be the stuff of a conventional, farcical exposure of middle class hypocrisy, yet in Rittner’s drama it becomes a fascinating study, never far from Czekhov and Witkacy, tapping all the resources of realism, irony and grotesque to show…