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Search Results: 1 - 10 of 64 matches for " Galileo "
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?Quién era Galileo?
Marquina, J.E.;álvarez, J.L.;
Revista mexicana de física E , 2009,
Abstract: galileo's life and scientific work, has been discussed and analyzed from many points of view. in this paper, the opinions of several authors are presented in order to show their profound divergences, as much in the philosophical as in the historical fields, that galileo provokes.
GALILEO. CD-ROM INTERACTIVO
Javier Galeano,,Juan Manuel Pastor,Ildefonso Ruiz-Tapiador,GEOMEDIA
Revista Eureka sobre Ense?anza y Divulgación de las Ciencias , 2009,
Abstract: GALILEO. CD-ROM INTERACTIVO
Quién era Galileo?
J.E. Marquina,J.L. álvarez
Revista mexicana de física E , 2009,
Abstract: La vida y obra de Galileo ha sido discutida y analizada desde una gran cantidad de puntos de vista. En este artículo se presentan las opiniones de diversos autores con la finalidad de mostrar las profundas divergencias que Galileo ha provocado en los ámbitos histórico y filosófico. Galileo's life and scientific work, has been discussed and analyzed from many points of view. In this paper, the opinions of several authors are presented in order to show their profound divergences, as much in the philosophical as in the historical fields, that Galileo provokes.
An Improved Model for Single-Frequency GPS/GALILEO Precise Point Positioning  [PDF]
Akram Afifi, Ahmed El-Rabbany
Positioning (POS) , 2015, DOI: 10.4236/pos.2015.62002
Abstract: This paper introduces a new precise point positioning (PPP) model, which combines single-fre- quency GPS/Galileo observations in between-satellite single-difference (BSSD) mode. In the absence of multipath, all receiver-related errors and biases are cancelled out when forming BSSD for a specific constellation. This leaves the satellite originating errors and atmospheric delays un- modelled. Combining GPS and Galileo observables introduces additional biases that have to be modelled, including the GPS to Galileo time offset (GGTO) and the inter-system bias. This paper models all PPP errors rigorously to improve the single-frequency GPS/Galileo PPP solution. GPSPace PPP software of Natural Resources Canada (NRCan) is modified to enable a GPS/Galileo PPP solution and to handle the newly introduced biases. A total of 12 data sets representing the GPS/Galileo measurements of six IGS-MEGX stations are processed to verify the newly developed PPP model. Precise satellite orbit and clock corrections from IGS-MEGX networks are used for both GPS and Galileo measurements. It is shown that sub-decimeter level accuracy is possible with single-frequency GPS/Galileo PPP. In addition, the PPP solution convergence time is improved from approximately 100 minutes for the un-differenced single-frequency GPS/Galileo solution to approximately 65 minutes for the BSSD counterpart when a single reference satellite is used. Moreover, an improvement in the PPP solution convergence time of 35% and 15% is obtained when one and two reference satellites are used, respectively.
Improved Between-Satellite Single-Difference Precise Point Positioning Model Using Triple GNSS Constellations: GPS, Galileo, and BeiDou  [PDF]
Akram Afifi, Ahmed El-Rabbany
Positioning (POS) , 2016, DOI: 10.4236/pos.2016.72006
Abstract: This paper introduces a new dual-frequency precise point positioning (PPP) model, which combines the observations of three different GNSS constellations, namely GPS, Galileo, and BeiDou. Our model is based on between-satellite single-difference (BSSD) linear combination, which cancels out some receiver-related biases, including receiver clock error and non-zero initial phase bias of the receiver oscillator. The reference satellite can be selected from any satellite system GPS, Galileo, and BeiDou when forming BSSD linear combinations. Natural Resources Canada’s GPS Pace PPP software is modified to enable a combined GPS, Galileo, and BeiDou PPP solution and to handle the newly introduced biases. A total of four data sets at four IGS stations are processed to verify the developed PPP model. Precise satellite orbit and clock products from the IGS-MGEX network are used to correct both of the GPS and Galileo measurements. It is shown that using the BSSD linear combinations improves the precision of the estimated parameters by about 25% compared with the GPS-only PPP solution. Additionally, the solution convergence time is reduced to 10 minutes for both BSSD scenarios, which represent about 50% improvement in comparison with the GPS-only PPP solution.
New Interpretation of Galileo’s Arthritis and Blindness  [PDF]
Alberto Zanatta, Fabio Zampieri, Maurizio Rippa Bonati, Guido Liessi, Cesare Barbieri, Scott Bolton, Cristina Basso, Gaetano Thiene
Advances in Anthropology (AA) , 2015, DOI: 10.4236/aa.2015.51005
Abstract: Galileo Galilei (1564-1642) complained of several disorders during his life, the most important of which were chronic arthritic pains and bilateral blindness. These symptoms might be results from an immune rheumatic disease, namely reactive arthritis (urethritis, uveitis, arthritis), when Galileo started suffering with an episode of fever in June 1593. Padua University owns the fifth lumbar vertebra of the great scientist and we performed a series of anthropological and radiographic analyses on it. The anthropological measurements showed that the shape of the vertebra was normal as to exclude significant diseases. The study through radiography and Computed Tomography showed only a mild arthrosis documented by small osteophytosis. Eventually the disease evolved into blindness with a pannus restricting the pupils (uveitis). These findings support the occurrence of reactive arthritis. Alternatively to urethral infection, Galileo could have suffered from Chlamydia pneumoniae infection in 1593, which was complicated by reactive arthritis a couple of weeks later. Thereafter he complained several episodes of recurrent arthritis, which eventually culminated into uveitis and bilateral blindness.\"\"
Comparison Of GPS/Galileo Single Frequency Ionospheric Models With Vertical Tec Maps
A. M. A. Farah
Artificial Satellites , 2008, DOI: 10.2478/v10018-009-0008-5
Abstract: The ionospheric delay is the major current source of potential range delay for single-frequency GNSS users (Kunches and Klobuchar, 2001). Single-frequency GNSS users are in most need of an ionospheric model to eliminate the ionospheric delay to a high degree of accuracy. GPS system uses the Klobuchar model for this task, which its coefficients are sent through the GPS navigation message to GPS users. Klobuchar model uses the Ionospheric Corrections Algorithm (ICA) (Klobuchar, 1987) designed to account for approximately 50% (rms) of the ionospheric range delay. NeQuick model is a model of the electron concentration profile that has been developed in the framework of the European Commission COST action 251. NeQuick model is being proposed for single-frequency operation in the European Galileo GNSS system (Radicella et al., 2003). A comparison study between the behaviour of the GPS Single-frequency ionospheric modelling (Klobuchar model) and the Galileo proposed approach for this task (NeQuick model) will be presented in this paper. The range delay correction by the two models has been assessed using the IGS-Global Ionospheric Maps for three different-latitude stations to reflect different geographic ionospheric activity states. The study was carried out over three different months that each of them reflects a different state of solar activity, which is a major indication for the ionospheric development state.
Reenacting Galileo’s Experiments
Paolo Palmieri
Aestimatio : Critical Reviews in the History of Science , 2010,
Abstract:
Galileo’s Instruments of Credit: Telescopes, Images, Secrecy by Mario Biagioli
Nick Wilding
Aestimatio : Critical Reviews in the History of Science , 2007,
Abstract:
Mechanics from Aristotle to Einstein by Michael J. Crowe
Peter Machamer
Aestimatio : Critical Reviews in the History of Science , 2008,
Abstract:
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