Search results for "Directions"

Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory

2017

We report a multi-resolution search for anisotropies in the arrival directions of cosmic rays detected at the Pierre Auger Observatory with local zenith angles up to $80^\circ$ and energies in excess of 4 EeV ($4 \times 10^{18}$ eV). This search is conducted by measuring the angular power spectrum and performing a needlet wavelet analysis in two independent energy ranges. Both analyses are complementary since the angular power spectrum achieves a better performance in identifying large-scale patterns while the needlet wavelet analysis, considering the parameters used in this work, presents a higher efficiency in detecting smaller-scale anisotropies, potentially providing directional informa…

Spatio-temporal Contrast Sensitivity in the Cardinal Directions of the Colour Space. A Review

2010

AbstractWe review the psychophysics of the spatio-temporal contrast sensitivity in the cardinal directions of the colour space and their correlation with those neural characteristics of the visual system that limit the ability to perform contrast detection or pattern-resolution tasks. We focus our attention particularly on the influence of luminance level, spatial extent and spatial location of the stimuli - factors that determine the characteristics of the physiological mechanisms underlying detection. Optical factors do obviously play a role, but we will refer to them only briefly. Contrast sensitivity measurements are often used in clinical practice as a method to detect, at their early …

Latvijas Universitātes stratēģija 2021–2027 (Saīsinātā versija)

2021

Dokuments izstrādāts Eiropas Sociālā fonda projekta “Labākas pārvaldības nodrošināšana Latvijas Universitātē” Nr. 8.2.3.0/18/A/019 ietvaros - // - The document was developed in the context of the European Social Fund project "To ensure better governance at the University of Latvia" No. 8.2.3.0/18/A/019

Osnovnye napravleniâ teolingvističeskih issledovanij v polʹskom i russkom âzykoznanii

2016

The links between the Polish and Russian linguistics are not only history but also a present fact. Theolinguistics’ development and research in the field of modern comparative linguistics led to the fact tliat at the turn of 20th -21th centuries, scientists bcgan to pay attention to the emerging problems of comparative Polish and Russian theolinguistics. A valuable contribution to the flourishing of Slavonic theolinguistics was made by the Polish researchers, who got not only accepted by the western researchers of English Theolinguistics, but also enriched it with new content, thereby giving a new start to the development of Slavonic theolinguistics. To date, the Polish and Russian theoling…

Innowacje pedagogiczne w edukacji wczesnoszkolnej

2014

Adaptive control of a class of strict-feedback time-varying nonlinear systems with unknown control coefficients

2018

Abstract In this paper, robust adaptive control of a class of strict-feedback nonlinear systems with unknown control directions is investigated. A novel Nussbaum-type function is developed and a key theorem is drawn which involves quantifying the addition of multiple Nussbaum functions with different control directions in a single inequality. Global stability of the closed-loop system and asymptotic stabilization of system output are proved. A simulation example is given to illustrate the effectiveness of the proposed control scheme.

La cultura ci salverà? Processi di touristification a base culturale nel centro storico di Palermo

2023

Negli ultimi tre decenni la cultura ha avuto un ruolo chiave nella costruzione delle politiche urbane, divenendo uno strumento decisivo nella definizione delle strategie di sviluppo economico e nell’accesso alla competizione globale che caratterizzano l’attuale regime di neoliberismo urbano (Miles e Paddison 2005). Anche nel sud Europa la cosiddetta rigenerazione a base culturale ha rappresentato e continua ancora oggi a rappresentare una vera e propria ortodossia urbana, che trova nel turismo tanto una ragione di esistenza quanto un campo di attuazione. In particolare, negli ultimi anni i centri storici di molte città sudeuropee sono stati oggetto di trasformazioni profonde in cui pratiche…

Search for signatures of magnetically-induced alignment in the arrival directions measured by the Pierre Auger Observatory

2011

We present the results of an analysis of data recorded at the Pierre Auger Observatory in which we search for groups of directionally-aligned events (or ‘multiplets’) which exhibit a correlation between arrival direc- tion and the inverse of the energy. These signatures are expected from sets of events coming from the same source after having been deflected by intervening coherent magnetic fields. The observation of several events from the same source would open the possibility to accurately reconstruct the position of the source and also measure the integral of the component of the magnetic field orthogonal to the trajectory of the cos- mic rays. We describe the largest multiplets found an…

POSSIBILITIES OF THE HEALTH CARE PERFECTION IN LATVIA

2010

Characterizing the health care system from the sustainable point of view, it is important to evaluate the operational principles of the healthy society. It is necessary to evaluate the existing problems in the health care sector and to identify further development possibilities in order to be able to perform the high healthy society standard. The Latvian financial accessibility of the health care during the last years has been explored. The article provides the analysis of main development tendencies of the medical accessibility for inhabitants, where suggestions of potentialities for their further development are given.

Observation of the cosmic-ray shadow of the Moon with IceCube

2013

We report on the observation of a significant deficit of cosmic rays from the direction of the Moon with the IceCube detector. The study of this "Moon shadow" is used to characterize the angular resolution and absolute pointing capabilities of the detector. The detection is based on data taken in two periods before the completion of the detector: between April 2008 and May 2009, when IceCube operated in a partial configuration with 40 detector strings deployed in the South Pole ice, and between May 2009 and May 2010 when the detector operated with 59 strings. Using two independent analysis methods, the Moon shadow has been observed to high significance (> 6 sigma) in both detector config…