Search results for "Galileo"
showing 10 items of 30 documents
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…
Life in the Solar System?
2010
Europa, the smallest of the four moons of Jupiter discovered by Galileo Galilei, has attracted much speculation on whether it might be inhabited ever since it was observed by the Voyager probes. This is mostly due to the fact that water, or better said, water-ice, is the most evident feature of that world, with ice covering this interesting satellite completely, turning it into a smooth white ball.
SAPERE ECONOMICO E METODO SCIENTIFICO NELL’ILLUMINISMO LOMBARDO: NOTE DA “IL CAFFÈ”
2011
Economic knowledge and scientific method in the lombard enlightenment. Notes from «Il caffè». The connections, emerging between the 16th and the 18th century, between the evolution of economic knowledge and the rise of the scientific method, are important research topics for historians of economic ideas. However, further research on the application of the scientific method is still needed, especially when we come to the analysis of how economic principles took shape in Lombardy during the Enlightenment. The same need for further research concerns the debates on economic policy during the Age of Reforms in the latter half of the eighteenth century. This is even more necessary for Milanese En…
Relativistic positioning: four-dimensional numerical approach in Minkowski space-time
2011
We simulate the satellite constellations of two Global Navigation Satellite Systems: Galileo (EU) and GPS (USA). Satellite motions are described in the Schwarzschild space-time produced by an idealized spherically symmetric non rotating Earth. The trajectories are then circumferences centered at the same point as Earth. Photon motions are described in Minkowski space-time, where there is a well known relation, Coll, Ferrando & Morales-Lladosa (2010), between the emission and inertial coordinates of any event. Here, this relation is implemented in a numerical code, which is tested and applied. The first application is a detailed numerical four-dimensional analysis of the so-called emissi…
Relativistic positioning: errors due to uncertainties in the satellite world lines
2014
Global navigation satellite systems use appropriate satellite constellations to get the coordinates of an user -close to Earth- in an almost inertial reference system. We have simulated both GPS and GALILEO constellations. Uncertainties in the satellite world lines lead to dominant positioning errors. In this paper, a detailed analysis of these errors is developed inside a great region surrounding Earth. This analysis is performed in the framework of the so-called relativistic positioning systems. Our study is based on the Jacobian, J, of the transformation giving the emission coordinates in terms of the inertial ones. Around points of vanishing J, positioning errors are too large. We show …
Sachs-Wolfe at second order: the CMB bispectrum on large angular scales
2009
We calculate the Cosmic Microwave Background anisotropy bispectrum on large angular scales in the absence of primordial non-Gaussianities, assuming exact matter dominance and extending at second order the classic Sachs-Wolfe result delta T/T = Phi/3. The calculation is done in Poisson gauge. Besides intrinsic contributions calculated at last scattering, one must consider integrated effects. These are associated to lensing, and to the time dependence of the potentials (Rees-Sciama) and of the vector and tensor components of the metric generated at second order. The bispectrum is explicitly computed in the flat-sky approximation. It scales as l(-4) in the scale invariant limit and the shape d…
The GALILEO γ-ray array at the Legnaro National Laboratories
2021
Abstract GALILEO, a new 4 π high-resolution γ -detection array, based on HPGe detectors, has been developed and installed at the Legnaro National Laboratories. The GALILEO array greatly benefits from a fully-digital read-out chain, customized DAQ, and a variety of complementary detectors to improve the resolving power by the detection of particles, ions or high-energy γ -ray transitions. In this work, a full description of the array, including electronics and DAQ, is presented together with its complementary instrumentation.
Galileo, God and Mathematics
2005
This chapter explores the relationship between God and the mathematics of Galileo. In the early modern era, the mathematical sciences began to produce potential instruments of power and to supply technically and socially valuable knowledge—for use in engineering, administration, and social control. This ability to produce useful knowledge and potential instruments of power became the critical basis for the existence of the mathematical sciences. In discussing Galileo's thoughts about mathematics and the mathematical sciences, it is necessary to keep in mind that he did not codify them and that he worked—as did many early modern scholars—with conflicting epistemologies. Furthermore, there is…
Performance assessment of PPP surveys with open source software using the GNSS GPS-GLONASS-Galileo constellations
2020
In this work, the performance of the multi-GNSS (Global Navigation Satellite System) Precise Point Positioning (PPP) technique, in static mode, is analyzed. Specifically, GPS (Global Positioning System), GLONASS, and Galileo systems are considered, and quantifying the Galileo contribution is one of the main objectives. The open source software RTKLib is adopted to process the data, with precise satellite orbits and clocks from CNES (Centre National d&rsquo
MUOVERSI AI MARGINI DELL'IGNOTO. PER UNA LETTERATURA COME FONTE DI CONOSCENZA
2018
Il saggio indaga i modelli del sapere scientifico nello specifico delle opere di Galileo Galilei, Il Saggiatore, in particolare, analizzandone il registro espressivo, lo stile, le formule metaforiche che rivelano uno stile e un modello di pensiero. La prosa scientifica di Galilei, elogiata da Leopardi, diviene paradigma di chiarezza e di lucidità del discorso argomentativo e saggistico della prosa italiana