نتایج جستجو برای: photon polarisation

تعداد نتایج: 74348  

2016
Ane S. Fors Camilla Brekke Anthony P. Doulgeris Torbjørn Eltoft Angelika H. H. Renner Sebastian Gerland

In this study, we investigate the potential of sea ice segmentation by Cand X-band multi-polarisation synthetic aperture radar (SAR) features during late summer. Five highresolution satellite SAR scenes were recorded in the Fram Strait covering iceberg-fast first-year and old sea ice during a week with air temperatures varying around 0 C. Sea ice thickness, surface roughness and aerial photogra...

2005
Giancarlo de Gasperis Amedeo Balbi Paolo Cabella Paolo Natoli

We present ROMA, a parallel code to produce joint optimal temperature and polarisation maps out of multidetector CMB observations. ROMA is a fast, accurate and robust implementation of the iterative generalised least squares approach to map-making. We benchmark ROMA on realistic simulated data from the last, polarisation sensitive, flight of BOOMERanG.

2001
Holger Gies Christian Schubert

The string-inspired technique is used for a first calculation of the one-loop axialvector vacuum polarisation in a general constant electromagnetic field. A compact result is reached for the difference between this tensor and the corresponding vector vacuum polarisation. This result is confirmed by a Feynman diagram calculation. Its physical relevance is briefly discussed.

Journal: :The British journal of ophthalmology 2005
M Centofanti F Oddone M Parravano L Gualdi M G Bucci G Manni

AIM To evaluate changes in corneal polarisation properties and their influence on peripapillary retinal nerve fibre layer (RNFL) thickness measurements after laser assisted in situ keratomileusis (LASIK) by means of scanning laser polarimetry (SLP) with variable corneal polarisation compensator (VCC) in normal white subjects. METHODS SLP was performed by means of GDx VCC on 32 eyes of 32 norm...

2014
ESA-VILLE IMMONEN Jari Vilppola Roger C. Hardie Victor Benno Meyer-Rochow Matti Weckström

In dim light, reliable coding of visual information becomes compromised, unless the sensitivity of the visual system to light is improved by structural and functional adaptations. Thus far, many adaptations for night vision in the compound eyes of nocturnal insects have been described, but little is known about the mechanisms underlying the electrochemical signalling in their photoreceptors. In...

Journal: :npj Quantum Information 2022

Abstract Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone insufficient high-security communications. Often, knowing who transmits a message to whom and when must also be kept hidden from an adversary. Here, we experimentally demonstrate five information-theoretically secure anonymity protocols on eight user city-wide quantum network ...

2003
Carlo Baccigalupi

We review the present knowledge of the diffuse Galactic synchrotron emission in polarisation. At microwave frequencies, we assess the expected contamination to the CMB polarisation angular power spectrum, for E and B modes, as expected after the WMAP first year measurements.

Journal: :Optics express 2013
Daba Radnatarov Sergey Khripunov Sergey Kobtsev Aleksey Ivanenko Sergey Kukarin

The present work demonstrates a fibre-laser system with automatic electronic-controlled triggering of dissipative soliton generation mode. Passive mode locking based on the effect of non-linear polarisation evolution has been achieved through a polarisation controller containing a single low-voltage liquid crystal plate whose optimal wave delay was determined from analysis of inter-mode beat sp...

2004
Guo-Chin Liu Antonio da Silva

We present the estimates of the Cosmic Microwave Background (CMB) polarisation power spectrum from galaxy clusters and filaments using hydrodynamical simulations of large scale structure formation. We focus in the present study on the CMB Quadrupole induced polari-sation, which is the dominate secondary polarisation effect, and give the E and B mode power spectra between l ∼ 560 to 20000.

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