Search results for "ORIENTATION"

A New Method of Investigation of the Orientation of Galaxies in Clusters in the Absence of Information on Their Morphological Types

2023

The analysis of the orientation of galaxies is one of the most widely used tools in the fields of extragalactic astronomy and cosmology, enabling the verification of structure formation scenarios in the universe. It is based on the statistical analysis of the distribution of angles, giving the spatial orientation of galaxies in space. In order to obtain the correct analysis results, one is obliged to take into account the Holmberg effect and the fact that galaxies are oblate spheroids, with the real axis ratio depending on the morphological type. However, most of the astronomical data available today do not contain information about the morphological types of galaxies. The analysis of suffi…

Observation et évaluation du dispositif de formation et d'insertion des jeunes de 16 à 18 ans en Bourgogne

1983

A new method to improve the prediction of the celestial pole offsets

2018

Knowledge of the Earth’s changing rotation is fundamental to positioning objects in space and on the planet. Nowadays, the Earth’s orientation in space is expressed by five Earth Orientation Parameters (EOP). Many applications in astronomy, geosciences, and space missions require accurate EOP predictions. Operational predictions are released daily by the Rapid Service/Prediction Centre of the International Earth Rotation and Reference Systems Service (IERS). The prediction procedures and performances differ for the three EOP classes: polar motion, rotation angle (UT1-UTC), and the two celestial pole offsets (CPO), dX and dY. The IERS Annual Report 2016 shows Rapid Service CPO predictions er…

Time-resolved buildup of twisted indirect exchange interaction in two-dimensional systems

2019

We study theoretically the time-domain dynamics of the spin-dependent Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between driven magnetic impurities localized in a spin-orbit-coupled two-dimensional system. Particular attention is given to the influence of the spin-orbit coupling (SOC) on the system's dynamical response to a time-dependent precessional motion of the localized magnetic moment. We show that, via the RKKY mechanism, a flip of the spin $z$ component of one localized moment affects all $x,\phantom{\rule{4pt}{0ex}}y$, and $z$ spin components of the other localized moment. The Friedel oscillations and the transient spin current triggered by the time-varying localized spin dep…

Case-studies on average-case analysis for an elementary course on algorithms

1999

Average-case algorithm analysis is usually viewed as a tough subject by students in the first courses in computer science. Traditionally, these topics are fully developed in advanced courses with a clear mathematical orientation. The work presented here is not an alternative to this, rather, it presents the analysis of algorithms (and average-case in particular) adapted to the mathematical background of students in an elementary course on algorithms or programming by using two selected case-studies.

The influence of eye movements on the temporal features of executed and imagined arm movements.

2007

The very close coordination between eye and hand indicates that eye movements are parts of the neural processes underlying the planning and control of arm movements. Eye movements are fundamental during observed actions and play a functional role in visual mental imagery. However, the role of eye movements during imagined actions is still unknown. Here, we report the timing features of eye and arm pointing movements for nine healthy participants in four conditions: Executed movements with orientation saccades (Eyes Free) or with no saccades (Eyes Motionless), and Imagined movements with Eyes Free or with Eyes Motionless. The first result was a facilitation effect of saccades upon both execu…

Keypoint descriptor matching with context-based orientation estimation

2014

Abstract This paper presents a matching strategy to improve the discriminative power of histogram-based keypoint descriptors by constraining the range of allowable dominant orientations according to the context of the scene under observation. This can be done when the descriptor uses a circular grid and quantized orientation steps, by computing or providing a global reference orientation based on the feature matches. The proposed matching strategy is compared with the standard approaches used with the SIFT and GLOH descriptors and the recent rotation invariant MROGH and LIOP descriptors. A new evaluation protocol based on an approximated overlap error is presented to provide an effective an…

Civic Participation and Gender Beliefs: An Analysis of 46 Countries

2016

Gender equality has progressed a great deal in recent decades in response to modernisation, industrialisation, and the generally rising level of education. A transformation in gender beliefs has accompanied the progress on gender equality and beliefs about gender roles have mainly changed in countries in North America and Europe, while in Muslim and Asian countries they have remained the same. The analysis in this article focuses on civic participation and investigates its relation to equalitarian gender beliefs. Multi-level regression models and data from World Values Survey (WVS) collected from 46 countries in 2005 allow depicting the relationships. The findings show that membership in ci…

Sex and Gender Equality Policies in Education in Three Southern European Societies: the cases of Andalusia and Valencian Community (Spain) and Portug…

2020

Gender mainstreaming is an international strategy in Europe relating to gender equality using an intersectional approach. It deals, specifically, with new challenges for sexuality and diversity in education. From within this context, this paper focuses on two goals. The first is to analyse sex and gender equality policies in education, since the 2000s, in three Southern European societies: Andalusia and Valencian Community, in Spain, and Portugal. The second goal is to arrive at some comparative conclusions about the recent developments in sex and gender equality policies in education in these three societies. We end with some comparative conclusions. First, there is the political orientati…

Teaching and Sexual Prejudices. New Training Needs

2013

Abstract This study focused on the future trainers’ attitude in respect of gender, sex and sexual orientation. Contrary to previous research studies, which associate to a greater knowledge a better attitude, our results shown that prejudices are still present even for graduate students. Therefore, it urges a reflection on a new teaching paradigm able to provide a plural gender identity vision. Training processes must be more than a mere intellectual education: a reflection on professional future.