Search results for "Horizon"

Is the French mobile phone cartel really a cartel?

2009

International audience; France Telecom (FT), SFR and Bouygues Telecom (BT) have been fined by France's Conseil de la Concurrence (CC) for organizing a mobile phone cartel with stable market shares (one-half, one-third and one-sixth, respectively) and for directly exchanging commercial information. While not contesting the legal decision, it is argued here that the economic reasoning is flawed. (1) As the CC made much of the firms' stable market shares, we have first followed this line of reasoning by considering that the market shares are quotas under uniform costs. Even if there is a general incentive to form a monopolistic cartel, BT was too small for it to be worth its while to join it; it i…

Zvaigžņotā Debess: 2005, Vasara

2005

Contents: In memoriam Arturs Balklavs-Grīnhofs ; Parting Words to Arturs Balklavs ; List of Publications by Prof. Dr.phys. Arturs Balklavs-Grīnhofs ; Astronomy in 25 Years of Soviet Latvia ; Man in Space: Based on newspaper “Pravda” materials ; U.Dzērvītis. Centenary of the Theory of Relativity ; A.Balklavs. Gamma Emission from the Galactic Centre ; A.Alksnis, Z.Alksne. Fewer Brown Dwarfs, More Red Ones ; A.Alksnis. New Observations of the Eruptive Variable Star V838 Mon ; A.Balklavs. Cosmic Objects in Captivating Photos – 5 ; J. Freimanis. On Polarization of Continuous Solar Spectrum ; J.Jaunbergs. The Very First Contact with Titan ; A.Millers. Biological Effects of Cosmic Rays ; J.Jansons…

Zvaigžņotā Debess: 2015, Rudens (229)

2015

Latvijas Universitāte

Criterios y sistemas de promoción profesional y ascensos y no discriminación por razón de género

2021

The legal guarantees to protect workers’ right to professional promotion and/or advancement in their profesional careers without suffering gender discrimination is a highly important issue in order to achieve an effective substantive equality between women and men in the labour relations field. To eradicate or, at least, considerably reduce the observed horizontal and vertical segregation in our labour market today, it is necessary to identify key factors such as those preventing female workers from professional promotion or, at least, those making their promotion more difficult than in the case of their male colleagues. The aim of this paper/report is to point out the main key factors that…

Influence of the concentration of oxygen on the swimming path of Brachionus plicatilis (Rotifera)

1993

Brachionus plicatilis females were maintained for > 24 hours in water where the concentration of oxygen was precisely controlled (spherical flasks with ≥ 6 mg 1−1 or < 0.5 mg 1−1; food = dead Tetraselmis sp.). Each female was randomly taken from one flask and quickly placed in an observation chamber containing the same experimental conditions. The swimming path was videotaped (5 minutes); then the size of the female was measured. The tape was analyzed by automatic tracking (25 x, y coordinates of the center of the animal, in a 512 × 512 pixels space). The swimming path was analyzed for ~45 females in both treatments. The speed (mm s−1 body length−1) was calculated for all trajectories, or o…

Piesārņojošo vielu akumulācija Latvijas mežu augšņu O horizontā: telpiskais un temporālais aspekts

2017

Augsnes piesārņojums ar smagajiem metāliem ir aktuāla problēma gan Latvijā, gan pasaulē. Bakalaura darba mērķis ir noskaidrot 11 ķīmisko elementu: Cd, Pb, Cu, Zn, V, Ni, Cr, Fe, Ca, Mg, K uzkrāšanos Latvijas priežu mežu augsnes O horizontā. Darbā izklāstīti augsnes galvenie piesārņojuma avoti, to izplatība un ietekme uz augsnes O horizontu, kā arī piesārņojuma akumulācija augsnes nedzīvajā zemsegā. Darbs sastāv no 4 galvenajām nodaļām. Pirmā nodaļa ir literatūras apskats par atmosfēras un augsnes piesārņojuma avotiem, ķīmisko elementu uzkrāšanos augsnē un to ietekmējošajiem faktoriem, atmosfēras piesārņojuma izpēti Latvijā. Otrajā nodaļā ir aprakstīti materiāli un metodes. Trešā nodaļa bals…

Modeling Atmospheric Turbulence via Rapid Distortion Theory: Spectral Tensor of Velocity and Buoyancy

2017

Abstract A spectral tensor model is presented for turbulent fluctuations of wind velocity components and temperature, assuming uniform vertical gradients in mean temperature and mean wind speed. The model is built upon rapid distortion theory (RDT) following studies by Mann and by Hanazaki and Hunt, using the eddy lifetime parameterization of Mann to make the model stationary. The buoyant spectral tensor model is driven via five parameters: the viscous dissipation rate ε, length scale of energy-containing eddies L, a turbulence anisotropy parameter , gradient Richardson number (Ri) representing the local atmospheric stability, and the rate of destruction of temperature variance . Model outp…

Hierarchical fuzzy/Lyapunov control for horizontal plane trajectory tracking of underactuated AUV

2010

A new hierarchical closed loop fuzzy control system for horizontal plane trajectory tracking of underactuated Autonomous Underwater Vehicles (AUV) is presented. A model for the AUV is formulated introducing a polar coordinates transformation for the velocities in the body fixed frame. It is employed to control the unactuated sway direction, the longitudinal position and the yaw by using the surge force and the yaw torque only. The highest level control is developed by employing a fuzzy inference system for obtaining the guidance control laws. The properties of the fuzzy system ensure forward surge velocity, fast convergence and Lyapunov's stability of the motion errors. A new low level kine…

The Macanese condominium reform under exam: for a comparative approach to the juristic "localization"

2013

First Determination of 2D Speed Distribution within the Bodies of Coronal Mass Ejections with Cross-correlation Analysis

2019

The determination of the speed of Coronal Mass Ejections (CMEs) is usually done by tracking brighter features (such as the CME front and core) in visible light coronagraphic images and by deriving unidimensional profiles of the CME speed as a function of altitude or time. Nevertheless, CMEs are usually characterized by the presence of significant density inhomogeneities propagating outward with different radial and latitudinal projected speeds, resulting in a complex evolution eventually forming the Interplanetary CME. In this work, we demonstrate for the first time how coronagraphic image sequences can be analyzed with cross-correlation technique to derive 2D maps of the almost instantaneo…