Results 21 to 30 of about 2,353,500 (291)

Electromagnetic Waves in a Rotating Frame of Reference [PDF]

, 2003
We discuss the electromagnetic measurements of rotating observers and study the propagation of electromagnetic waves in a uniformly rotating frame of reference.
Hauck, John C., Mashhoon, Bahram
core   +2 more sources

Nutation and Reference Frame [PDF]

Highlights of Astronomy, 1995
The reference frames are of fundamental importance in all kinds of the precession and nutation studies involving the theory, the coordinate transformation and the observations. The aim of this paper is to review all the frames used in such studies and to lead to a better consistency between them in order that theory and reductions of observations be ...
openaire   +1 more source

De la notion au référentiel international de politique publique. Le savant, l’expert et le politique dans la construction du vieillissement actif

Recherches Sociologiques et Anthropologiques, 2013
The goal of this article is to show how, from a simple concept, “active ageing” was gradually transformed into an international frame of reference in public policies on the subject of ageing.
Thibauld Moulaert, Jean-Philippe Viriot Durandal   +1 more
doaj   +1 more source

A Unified Global Reference Frame of Vertical Crustal Movements by Satellite Laser Ranging

Sensors, 2016
Crustal movement is one of the main factors influencing the change of the Earth system, especially in its vertical direction, which affects people’s daily life through the frequent occurrence of earthquakes, geological disasters, and so on.
Xinhui Zhu, Ren Wang, Fuping Sun, Jinling Wang   +3 more
doaj   +1 more source

Adaptive training‐feedback scheme for FDD in massive MIMO systems

IET Communications, 2023
Accurate acquisition of channel state information (CSI) is crucial but difficult in frequency division duplex (FDD) massive multiple‐input multiple‐output (MIMO) systems.
Yi Huang, Haiquan Wang, Danbei Gao, Zhijin Zhao   +3 more
doaj   +1 more source

A computational model of the referential semantics of projective prepositions [PDF]

, 2006
In this paper we present a framework for interpreting locative expressions containing the prepositions in front of and behind. These prepositions have different semantics in the viewer-centred and intrinsic frames of reference (Vandeloise, 1991).
Kelleher, John D., van Genabith, Josef
core   +2 more sources

Inner space: Reference frames [PDF]

Current Biology, 2002
How are we aware of our surroundings? Somehow, from a pair of tiny, two-dimensional pictures of the visual world – provided by our retinas – our brains are able to render the world as it is, accurately depicting the locations of both a distant mountain range and the camera we are pointing at it.
openaire   +2 more sources

Blazars define a stable celestial reference frame

Astronomy & Astrophysics
Context. Recent work has shown that optical-radio position offsets and radio position variability are inversely correlated with the optical photometric variability of active galactic nuclei (AGN).
Secrest N. J., Lambert S.
doaj   +1 more source

The Two-Wrongs model explains perception-action dissociations for illusions driven by distortions of the egocentric reference frame

Frontiers in Human Neuroscience, 2015
Several studies have demonstrated a dissociation of the effects of illusion on perception and action, with perception generally reported to be susceptible to illusions, while actions are seemingly immune.
Paul eDassonville, Scott Allan Reed
doaj   +1 more source

Concept of spatial coordinate systems, their defining and implementation as a precondition in geospatial applications [PDF]

Glasnik Srpskog Geografskog Društva, 2015
There are many users of spatial information, and quite large interest about the nature and genesis of such information. Different users found spatial information in the form of maps, plans or alphanumerical tables. Recently, there are more often
Nedeljković Zoran, Sekulić Aleksandar
doaj   +1 more source