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ON THE MODULI SPACE OF POLYGONS IN THE EUCLIDEAN PLANE
MODULI SPACE POLYGONS EUCLIDEAN PLANE
2015/10/14
ON THE MODULI SPACE OF POLYGONS IN THE EUCLIDEAN PLANE.
Space-time variations of the Umbria-Marche region instrumental seismicity
b value seismicity Apennines
2015/9/29
In the Umbria-Marche region, space and time variations concerning the b value were studied by instrumental seismicity from January 1987 to May 1999, according to the Bender method. Data were divided i...
BLIND SOURCE SEPARATION BASED ON SPACE-TIME-FREQUENCY DIVERSITY
BLIND SOURCE SEPARATION SPACE-TIME-FREQUENCY DIVERSITY
2015/9/29
We investigate the assumption that sources have disjoint support in the time domain, time-frequency domain, or frequency domain. We call such signals disjoint orthogonal. The class of signals that app...
The Margulis Invariant of Isometric Actions on Minkowski (2+1)-Space
Minkowski (2+1)-Space Isometric Actions
2015/9/29
Let E denote an a±ne space modelled on Minkowski (2+1)-space E
and let ¡ be a group of isometries whose linear part L(¡) is a purely hyperbolic
subgroup of SO0
(2;1). Margulis has deˉned ...
NONSTANDARD LORENTZ SPACE FORMS
lorentz Space form
2015/9/29
In their recent paper [8], Kulharni and Raymond show that a closed
3-manifold which admits a complete Lorentz metric of constant curvature 1
(henceforth called a complete Lorentz structure) must be ...
Local rigidity of discrete groups acting on complex hyperbolic space
complex hyperbolic space Local rigidity
2015/9/29
The superrigidity theorem of Margulis, see Zimmer [17], classifies finite dimen-sional representations of lattices in semi-simple Lie groups of real rank strictly
larger than 1. It is a fundamental ...
THE FUNDAMENTAL GROUP OF A COMPACT FLAT LORENTZ SPACE FORM IS VIRTUALLY POLYCYCLIC
lorentz Multi-loop spatial form
2015/9/29
A flat Lorentz space form is a geodesically complete Lorentzian manifold of
zero curvature. It is well known (see Auslander & Markus [3]) that such a space
M may be represented as a quotient Rw
/Γ,...
COST 271 Action - Effects of the upper atmosphere on terrestrial and Earth-space communications: introduction
upper atmosphere Space through
2015/9/14
The COST 271 Action («Effects of the Upper Atmosphere on Terrestrial and Earth-space Communications
») within the European ionospheric community has the objectives, embodied in the
Memoran...
Assessment of space plasma effectsfor satellite applications:Working Group 2 overview
effectsfor Space plasma
2015/9/14
An important part of the tasks of Working Group 2 of the COST Action 271 «Assessment of space plasma effect for satellites applications» is the assessment of novel data sources for informati...
Space plasma effects on Earth-spaceand satellite-to-satellite communications:Working Group 4 overview
Earth-spaceand satellite-to-satellite Space plasma
2015/9/14
This paper summarizes the the activities carried out by Working Group 4 of COST 271 Action. The structure of this Working Group included four Working packages that were dealing with different aspects ...
Real time monitoring for nowcasting and forecasting ionospheric space weatherin Europe with ground digisondes
ionosphere ionospheric nowcasting ionospheric forecasting space weather ionogram scaling digisonde ionospheric monitoring networks
2015/9/10
The Earth's ionosphere largely determines space weather effects on radio wave communications, navigation and
surveillance systems. Lately there has been an increasing demand for ionospheric nowcast a...
Southern-Tyrrhenian seismicity in space-time-magnitude domain
Southern-Tyrrhenian Sea statistical models aftershock sequences background seismicity
2015/9/8
An analysis is conducted on a catalogue containing more than 2000 seismic events
occurred in the southern Tyrrhenian Sea between 1988 and October 2002, as an attempt
to characterise the main seismog...
Near Earth space plasma monitoring under COST 296
Ionosphere monitoring data validation monitoring techniques campaigns dissemination
2015/8/28
This review paper presents the main achievements of the near Earth space plasma monitoring under COST 296 Action. The outputs of the COST 296 community making data, historical and real-time, standardi...
Near-Earth space plasma modelling and forecasting
Ionospheric modeling ionospheric forecasting ionospheric predictions
2015/8/28
In the frame of the European COST 296 project (Mitigation of Ionospheric Effects on Radio Systems, MIERS) in the Working Package 1.3, new ionospheric models, prediction and forecasting methods and pro...
Space Plasma Effects
ionosphere/space weather monitoring ionospheric variability ionospheric bubbles ionospheric gradients
2015/8/28
This paper summarizes the activities carried out by WP 3.1 of WG 3 of COST 296 action. The Work Package deals mostly with medium and large ionospheric structures that impacts on GNSS signals. In the r...