Results 11 to 20 of about 28,920,622 (304)

Corrections of proper motions in declination by using ILS data [PDF]

open access: yesSerbian Astronomical Journal, 2006
There are nowadays numerous astrometric ground{based observations of some stars referred to Hipparcos Catalogue, made at many observatories during the last century.
Damljanović G., Pejović N.
doaj   +1 more source

Systems of Reference for Personality Structure: Peseschkian & Zubiri on Systems of Reference [PDF]

open access: yesThe Global Psychotherapist, 2023
The Spanish philosopher, Xavier Zubiri, wrote a major work titled Sentient Intelligence wherein he analyzes the human act of intellective knowing.
Theodore A. Cope
doaj   +1 more source

Frequency Transition From Weak to Strong Turbulence in the Solar Wind

open access: yesFrontiers in Astronomy and Space Sciences, 2022
During a specific time window while approaching the Sun, the longitudinal speed of Parker Solar Probe matches that of the Sun’s rotation. The spacecraft therefore co-rotates with the Sun, and as long as it does so, it is immersed in the solar-wind plasma
Daniele Telloni
doaj   +1 more source

Comparison of standardized sampling and measurement reference systems for aircraft engine non-volatile particulate matter emissions

open access: yesJournal of Aerosol Science, 2020
The International Civil Aviation Organization has established new regulatory standards for emissions certification of non-volatile particulate matter (nvPM) from aircraft turbine engines.
P. Lobo   +16 more
semanticscholar   +1 more source

Comparison of Full-Reference Image Quality Models for Optimization of Image Processing Systems

open access: yesInternational Journal of Computer Vision, 2021
The performance of objective image quality assessment (IQA) models has been evaluated primarily by comparing model predictions to human quality judgments.
Keyan Ding   +3 more
semanticscholar   +1 more source

Astrometry test of MSCRED IRAF software package [PDF]

open access: yesSerbian Astronomical Journal, 2005
Astrometric properties of images obtained using MSCRED IRAF software package are investigated. CCD observations of M35 open cluster were taken in an observation run between October 10 and 17, 2004 at Belogradchick Observatory (Bulgaria) using the 60cm ...
Popescu R.   +3 more
doaj   +1 more source

The Effects of Inertial Forces on the Dynamics of Disk Galaxies

open access: yesGalaxies, 2021
When dealing with galactic dynamics, or more specifically, with galactic rotation curves, one basic assumption is always taken: the frame of reference relative to which the rotational velocities are given is assumed to be inertial.
Roy Gomel, Tomer Zimmerman
doaj   +1 more source

First Principles Description of Plasma Expansion Using the Expanding Box Model

open access: yesUniverse, 2023
Multi-scale modeling of expanding plasmas is crucial for understanding the dynamics and evolution of various astrophysical plasma systems such as the solar and stellar winds. In this context, the Expanding Box Model (EBM) provides a valuable framework to
Sebastián Echeverría-Veas   +3 more
doaj   +1 more source

Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades [PDF]

open access: yesSerbian Astronomical Journal, 2011
During the last century, there were many so-called independent latitude (IL) stations with the observations which were included into data of a few international organizations (like Bureau International de l'Heure - BIH, International Polar ...
Damljanović G., Milić I.S.
doaj   +1 more source

Reference Systems [PDF]

open access: yesInternational Astronomical Union Colloquium, 1997
AbstractA reference system is a relation connecting observables and their mathematical represententions. The principle of general relativity assures that any sort of coordinate system can be used to describe physical phenomena. Thus, any reference system is only a convention. There is no absolutely true reference system.
openaire   +1 more source

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