The LARASE research program. State of the art on modelling and measurements of general relativity effects in the field of the Earth: A preliminary measurement of the Lense-Thirring effect

2017 ◽  
Author(s):  
David M. Lucchesi ◽  
Carmelo Magnafico ◽  
Roberto Peron ◽  
Massimo Visco ◽  
Luciano Anselmo ◽  
...  
Keyword(s):  
General Relativity ◽  
Research Program ◽  
State Of The Art ◽  
Preliminary Measurement ◽  
The Earth

scholarly journals Testing Gravitational Theories in the Field of the Earth with the SaToR-G Experiment

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 192
Author(s):  
David Lucchesi ◽  
Luciano Anselmo ◽  
Massimo Bassan ◽  
Marco Lucente ◽  
Carmelo Magnafico ◽  
...  
Keyword(s):  
General Relativity ◽  
State Of The Art ◽  
Current Knowledge ◽  
Slow Motion ◽  
Weak Field ◽  
New Physics ◽  
The State ◽  
The Earth ◽  
Gravitational Theories ◽  
Theories Of Gravitation

A new satellite-based experiment in the field of gravitation, SaToR-G, is presented. It aims to compare the predictions of different theories of gravitation in the limit of weak-field and slow-motion. The ultimate goal of SaToR-G is searching for possible “new physics” beyond General Relativity, which represent the state-of-the-art of our current knowledge of gravitational physics. A key role in the above perspective is the theoretical and experimental framework that confines our work. To this end, we will exploit as much as possible the classical framework suggested by R.H. Dicke over fifty years ago.

Computers in Geology - 25 Years of Progress

1994 ◽  
Keyword(s):  
Computer Modeling ◽  
Quantitative Methods ◽  
State Of The Art ◽  
International Association ◽  
Mathematical Geology ◽  
25Th Anniversary ◽  
The Earth ◽  
Wide Range ◽  
History Of ◽  
Mapping Techniques

This volume vividly demonstrates the importance and increasing breadth of quantitative methods in the earth sciences. With contributions from an international cast of leading practitioners, chapters cover a wide range of state-of-the-art methods and applications, including computer modeling and mapping techniques. Many chapters also contain reviews and extensive bibliographies which serve to make this an invaluable introduction to the entire field. In addition to its detailed presentations, the book includes chapters on the history of geomathematics and on R.G.V. Eigen, the "father" of mathematical geology. Written to commemorate the 25th anniversary of the International Association for Mathematical Geology, the book will be sought after by both practitioners and researchers in all branches of geology.

Neumayer, Humboldt and the search for a global physics

2011 ◽  
Vol 123 (1) ◽  
pp. 2
Author(s):  
R.W. Home
Keyword(s):  
Dynamical System ◽  
Research Program ◽  
Scientific Investigation ◽  
Point Of View ◽  
Mineral Deposits ◽  
New Mineral ◽  
Alexander Von Humboldt ◽  
The Earth

In setting up the Flagstaff Observatory in Melbourne in 1857, the young German geophysicist Georg Neumayer brought new standards of precision to the pursuit of physics in Australia. His wide-ranging research program in geomagnetism, meteorology and oceanography was conceived within an overall approach to science associated especially with the name of Alexander von Humboldt, that saw the Earth and its oceans and atmosphere as an integrated dynamical system. Neumayer also, however, envisaged immediate practical outcomes from his work, whether in determining optimal sailing routes between Europe and Australia, or in locating new mineral deposits. From a personal point of view he regarded his seven years in Australia as, above all, a preparation for the scientific investigation of Antarctica that he dreamed in vain of undertaking.

The Use of Serpentine Earth Coils in Ground Coupled Heat Pump Systems

1984 ◽  
Vol 106 (4) ◽  
pp. 438-446
Author(s):  
P. D. Metz
Keyword(s):  
Thermal Properties ◽  
Heat Pump ◽  
Research Program ◽  
Undisturbed Soil ◽  
Heat Rejection ◽  
Term Operation ◽  
The Earth ◽  
Soil Thermal Properties ◽  
Coil Performance ◽  
Ground Coupled Heat Pump

A research program at Brookhaven National Laboratory (BNL) has studied ground coupling, i.e., the use of the earth as a heat source/sink or storage medium for solar-assisted and stand-alone heat pump systems. As part of this research program, five serpentine earth coil experiments were operated between December 1978 and September 1981. Heat was added to or removed from the earth coils according to weekly schedules based on computer simulations of solar-assisted and stand-alone, ground-coupled heat pump systems operated in the local (New York) climate. Each earth coil was operated according to a different control strategy. This paper presents experimental results from these experiments for the period December 1978 to April 1981, and compares these results to those generated by a comptuer model, GROCS, developed at BNL. The model is found to provide a reasonably good fit to the data, for the most part, using the experimental undisturbed soil thermal properties. In some cases, the use of a lower soil thermal conductivity provides a better fit, particularly during summer months when heat was added to the ground. Thus, given soil properties, GROCS can be used to predict earth coil performance. If given earth coil performance, the model can predict soil thermal properties. Serpentine earth coils are found to be suitable to provide auxiliary heat or heat rejection for solar heat pump systems. In fact, earth coil-based, stand-alone, ground-coupled heat pump systems can provide all heat needed for winter space heating and all heat rejection required for summer space cooling with no need for any auxiliary heating. Subfreezing winter operation is necessary for shallow earth coils in cold climates. No deleterious effects to the ground were observed from the long-term operation of these experiments.

scholarly journals Geomagnetism, volcanoes, global climate change, and predictability. A progress report

1994 ◽  
Vol 37 (5 Sup.) ◽  
Author(s):  
G. P. Gregori
Keyword(s):  
State Of The Art ◽  
Global Climate ◽  
Data Series ◽  
Theoretical Studies ◽  
Data Handling ◽  
Future Perspectives ◽  
Proxy Data ◽  
Interstellar Clouds ◽  
The Earth ◽  
Glacier Melting

A model is investigated, by which the encounters of the solar system with dense interstellar clouds ought to trigger either geomagnetic field reversals or excursions, that produce extra electric currents within the Earth dynamo, that cause extra Joule's heating, that supplies volcanoes and endogenous processes. Volcanoes increase the Earth degassing into the atmosphere, hence the concentration of the minor atmospheric constituents, including the greenhouse gases, hence they affect climate temperature, glacier melting, sea level and global change. This investigation implies both theoretical studies and observational data handling on different time scales, including present day phenomena, instrumental data series, historical records, proxy data, and geological and palaeontological evidences. The state of the art is briefly outlined, mentioning some already completed achievements, investigations in progress, and future perspectives.

scholarly journals Comparative study of the diachronic evolution of the geological and volcanological environments of the earth with the saturnian satellites Titan and Enceladus

2013 ◽  
Author(s):  
Ανεζίνα Σολωμονίδου
Keyword(s):  
Comparative Study ◽  
State Of The Art ◽  
The Earth

Η παρούσα διδακτορική διατριβή αφορά τη μελέτη των περιβαλλόντων του Τιτάνα και τουΕγκέλαδου, δορυφόρων του Κρόνου, μέσω της ανάλυσης δεδομένων που ανακτήθηκαν απότη διαστημική αποστολή Cassini-Huygens. Αρχικά παρουσιάζεται η επισκόπηση τηςγεωλογίας του Τιτάνα, με επίκεντρο τις γεωλογικές δομές και διεργασίες και το συσχετισμόμεταξύ της ατμόσφαιρας, της επιφάνειας και του εσωτερικού του δορυφόρου. Οιμορφοτεκτονικές δομές κατατάσσονται σε συγκεκριμένες κατηγορίες βάσει γήινων μοντέλωνσχηματισμού. Επιφανειακές περιοχές του Τιτάνα, οι οποίες θεωρούνται συνδεδεμένες με τοεσωτερικό, συγκρίθηκαν με γεωφυσικά μοντέλα παλιρροιακής στρέβλωσης καιδιαπιστώθηκε ότι συμπίπτουν σε σχέση με τη θέση, την επιφάνεια και την εσωτερικήενεργότητα. Ένα δεύτερο μέρος της διδακτορικής διατριβής παρουσιάζει την ενδελεχήανάλυση συγκεκριμένων περιοχών του Τιτάνα –όπως αυτές καθορίζονται μέσω μιαςστατιστικής μεθόδου– με επίκεντρο την επιφανειακή ανακλαστικότητα που παρουσιάζουνκαι τη χημική σύνθεση από την επεξεργασία δεδομένων του φασματογράφου Cassini/VIMS(εγγύς υπέρυθρη περιοχή του φάσματος από 0,4 έως 5 micron). Η εφαρμογή ενόςεκσυγχρονισμένου και state-of-the-art κώδικα μεταφοράς ακτινοβολίας, επέδειξε τηφασματική συμπεριφορά και το εύρος της φωτεινότητας αυτών των περιοχών. Η έρευνατριών σημαντικών περιοχών, που έχουν προταθεί ως υποψήφιες κρυοηφαιστειακές (HoteiRegio, Tui Regio και Sotra Patera), παρουσίασε ενδείξεις χρονικής μεταβολής τηςεπιφανειακής ανακλαστικότητας για δύο από αυτές σε μια χρονική περίοδο από 1-3,5 χρόνια,υποδεικνύοντας δυναμικές εξωγενείς - ενδογενείς διεργασίες, οι οποίες επηρεάζουν τηνεπιφάνεια και είναι συμβατές με φαινόμενα κρυοηφαιστεότητας στην περίπτωση της SotraPatera. Επίσης, οι διαδικασίες που σχηματίζουν την επιφάνεια του Εγκέλαδου περιγράφονταιλεπτομερειακά στη διατριβή. Σε ένα τρίτο μέρος, γήινα ανάλογα επιφανειακών εμφανίσεωνκαθώς και διεργασιών παρουσιάζονται εκτεταμένα, επισημαίνοντας ενδιαφέρουσεςομοιότητες και διαφορές μεταξύ της πυριτικής Γης και των παγωμένων δορυφόρων. Οιαστροβιολογικές συσχετίσεις αυτής της εργασίας διεξάγονται στο πλαίσιο της αναζήτησηςπεριβαλλόντων κατοικησιμότητας στο εξωτερικό ηλιακό σύστημα. Όλες οι προαναφερθείσεςμελέτες συνδέονται με την προετοιμασία των μελλοντικών διαστημικών αποστολών και τωνοργάνων τους στα συστήματα του Κρόνου και του Δία. Τέλος, συζητούνται οι δυνατότητεςεκλαΐκευσης της επιστήμης και οι προοπτικές που παρουσιάζει η συγκεκριμένη έρευνα.

scholarly journals Coordinate time in the vicinity of the Earth

1986 ◽  
Vol 114 ◽  
pp. 299-313 ◽  
Author(s):  
D. W. Allan ◽  
N. Ashby
Keyword(s):  
General Relativity ◽  
Atomic Clock ◽  
Space Vehicles ◽  
Atomic Clocks ◽  
Coordinate Time ◽  
The Earth ◽  
Frequency Comparison ◽  
New Applications ◽  
Frequency Metrology

Atomic clock accuracies continue to improve rapidly, requiring the inclusion of general relativity for unambiguous time and frequency clock comparisons. Atomic clocks are now placed on space vehicles and there are many new applications of time and frequency metrology. This paper addresses theoretical and practical limitations in the accuracy of atomic clock comparisons arising from relativity, and demonstrates that accuracies of time and frequency comparison can approach a few picoseconds and a few parts in 1016, respectively.

scholarly journals Computation of precise geoid model of Auvergne using current UNB Stokes-Helmert’s approach

2017 ◽  
Vol 47 (3) ◽  
pp. 201-229 ◽  
Author(s):  
Juraj Janák ◽  
Petr Vańiček ◽  
Ismael Foroughi ◽  
Robert Kingdon ◽  
Michael B. Sheng ◽  
...  
Keyword(s):  
State Of The Art ◽  
Gravity Anomalies ◽  
Atmospheric Effects ◽  
Practical Application ◽  
Geoid Model ◽  
Final Model ◽  
The Earth ◽  
Global Gravity ◽  
Correct Application ◽  
Downward Continuation Of Gravity

AbstractThe aim of this paper is to show a present state-of-the-art precise gravimetric geoid determination using the UNB Stokes-Helmert’s technique in a simple schematic way. A detailed description of a practical application of this technique in the Auvergne test area is also provided. In this paper, we discuss the most problematic parts of the solution: correct application of topographic and atmospheric effects including the lateral topographical density variations, downward continuation of gravity anomalies from the Earth surface to the geoid, and the optimal incorporation of the global gravity field into the final geoid model. The final model is tested on 75 GNSS/levelling points supplied with normal Molodenskij heights, which for this investigation are transformed to rigorous orthometric heights. The standard deviation of the computed geoid model is 3.3 cm without applying any artificial improvement which is the same as that of the most accurate quasigeoid.

scholarly journals Perihelion advances for the orbits of Mercury, Earth, and Pluto from extended theory of general relativity (ETGR)

2014 ◽  
Vol 92 (12) ◽  
pp. 1709-1713
Author(s):  
Luis Santiago Ridao ◽  
Rodrigo Avalos ◽  
Martín Daniel De Cicco ◽  
Mauricio Bellini
Keyword(s):  
General Relativity ◽  
Solar System ◽  
Flat Manifold ◽  
Force Component ◽  
Extended Theory ◽  
Ricci Flat ◽  
The Earth ◽  
Canonical Metric ◽  
Planetary Orbits ◽  
Good Agreement

We explore the geodesic movement on an effective four-dimensional hypersurface that is embedded in a five-dimensional Ricci-flat manifold described by a canonical metric, to applying to planetary orbits in our solar system. Some important solutions are given, which provide the standard solutions of general relativity without any extra force component. We study the perihelion advances of Mercury, the Earth, and Pluto using the extended theory of general relativity. Our results are in very good agreement with observations and show how the foliation is determinant to the value of the perihelion’s advances. Possible applications are not limited to these kinds of orbits.

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