scholarly journals The significance of determination of the absolute value of gravity in geodesy

Tehnika ◽  
2021 ◽  
Vol 76 (1) ◽  
pp. 17-24
Author(s):  
Sofija Naod
Keyword(s):  
Theoretical Basis ◽  
Absolute Gravity ◽  
Reference Systems ◽  
Global Knowledge ◽  
Earth’S Gravity Field ◽  
Absolute Value ◽  
Reference Networks ◽  
The Absolute ◽  
Gravimetric System

The gravity is used to solve geodesy's primary tasks, such as determining geoid and defining the height and gravimetric reference networks of different scales, from national to global. Knowledge of gravity is of great importance for both metrology and geodetic metrology. In addition to the historical overview of absolute gravimeters, this paper presents the theoretical basis of the most commonly used method for determining the absolute value of gravity. The principle of operation of the absolute gravimeter FG5 and the importance of international comparison of absolute gravimeters are briefly presented. An overview of the gravimetric reference systems is given, emphasizing the establishment of the International Reference Gravimetric System. The previous works concerning the absolute determination of acceleration due to Earth's gravity field in Serbia are presented. Finally, the importance of determining the absolute value of gravity from the geodetic and metrological perspective is pointed out. Both national and international significance of determining absolute gravity in defining gravimetric reference systems and the importance of absolute gravity in monitoring global phenomena are emphasized.

scholarly journals I. Experiments, by the method of Lorentz, for the further determination of the absolute value of the British association unit of resistance, with an appendix on the determination of the pitch of a standard tuning-fork

1883 ◽  
Vol 34 (220-223) ◽  
pp. 438-439
Keyword(s):  
Tuning Fork ◽  
British Association ◽  
Cavendish Laboratory ◽  
Absolute Value ◽  
The Absolute ◽  
The Difference

The experiments described in the present paper were carried out during the spring and summer months of the present year, at the Cavendish Laboratory, and are divided into three distinct series. In the first and second series, the induction coils were situated nearly in the plane of the revolving disk, as in Lorentz’s original use of the method; the difference between the two series relating only to the speed of rotation, which was varied in the proportion of 10:16.

NEW DETERMINATION OF THE ABSOLUTE VALUE OF THE RADIUM: URANIUM RATIO.1

1920 ◽  
Vol 42 (6) ◽  
pp. 1170-1177 ◽  
Author(s):  
S. C. Lind ◽  
L. D. Roberts
Keyword(s):  
Absolute Value ◽  
The Absolute

scholarly journals DIONYSOS SATELLITE OBSERVATORY AND HIGHER GEODESY LABORATORY: HISTORY AND PERSPECTIVES

2017 ◽  
Vol 50 (2) ◽  
pp. 1091
Author(s):  
A. Marinou ◽  
D. Anastasiou ◽  
X. Papanikolaou ◽  
D. Paradissis ◽  
V. Zacharis
Keyword(s):  
Gravity Field ◽  
Temporal Variations ◽  
Technological Advance ◽  
Satellite Geodesy ◽  
Research Needs ◽  
Reference Systems ◽  
Earth’S Gravity Field ◽  
Wide Range

Dionysos Satellite Observatory and Higher Geodesy Laboratory have been in operation since the 60s and their main objective is to fulfill academic and research needs, determined through the ongoing scientific and technological advance in the field of geodesy. They are involved in all scientific domains related to the determination of earth’s size and figure, as well as its temporal variations. Their field of expertise is Satellite Geodesy, (spanning a wide range of applications like reference systems, tectonic geodesy, etc.), as well as the study of the geoid and earth's gravity field.

Determination of Chemical Composition in Zircon-Refractory Material by MLD Method

2017 ◽  
Vol 726 ◽  
pp. 434-439
Author(s):  
Wei Han ◽  
Yu Bing Liu ◽  
Jian Xing Ren ◽  
Juan Juan Lu
Keyword(s):  
Chemical Composition ◽  
Refractory Material ◽  
Standard Method ◽  
National Standard ◽  
Absolute Value ◽  
X Ray ◽  
Zircon Refractory ◽  
Counting Error ◽  
The Absolute

The contents of each element in the melting glass samples of zircon-refractory material were measured by X-ray fluorescence spectrometry. The samples were melted completely with uniform intensity. Then the incident ray absorption coefficient and the MLD coefficient of the solvents and samples were extracted by using the method of equivalent wavelength. Finally the chemical composition of zircon-refractory material was determined by MLD coefficient and normalization calculation method. The results are consistent with those obtained with the national standard method and the absolute value of error is less than 0.1%. The precision is comparative with the counting error of XRF analysis and the absolute value of the standard deviation is less than 0.05%, being much higher than national standard method. At the same time, this method is simple, easy to be operated.

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