Study on Digital Modeling of the Virtual Near-Earth Space for Astronaut Training

A near-Earth space scene digital modeling was studied for the model simulation, which could be used to show the virtual near-Earth space scene with a high fidelity. Based on the technology of computer graphics processing, detailed analysis was proposed to study the effects of the rendering of geometry models to processing in real-time, the method of spatial movements to objects motion, and the role of spatial illumination to objects brightness, furthermore the simplified, modeling and adjustment methods of each model were demonstrated. The digital model of the HDR near-Earth space scene was established, which laid the theoretical and engineering foundation for the virtual scene simulation.

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Beacon-satellite observations of wave disturbances in the plasma of near-earth space

Kosmìčna nauka ì tehnologìâ ◽

10.15407/knit2004.02.016 ◽

2004 ◽

Vol 10 (2-3) ◽

pp. 16-21

Author(s):

O.F. Tyrnov ◽

◽

Yu.P. Fedorenko ◽

L.F. Chernogor ◽

◽

...

Keyword(s):

Satellite Observations ◽

Earth Space ◽

Near Earth Space ◽

Wave Disturbances

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Supplemental Material: The role of the westerlies and orography in Asian hydroclimate since the late Oligocene

10.1130/geol.s.12114426 ◽

2020 ◽

Author(s):

Xin Wang

Keyword(s):

Model Simulation ◽

Late Oligocene ◽

Geological Setting

Detailed description of sample analyses, geological setting, model simulation, and the data presented in the paper.<br>

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Design of X-Band SSPA Based on GaN HEMT for Telemetry Subsystem of Near-Earth Space Missions

AEU - International Journal of Electronics and Communications ◽

10.1016/j.aeue.2021.153781 ◽

2021 ◽

pp. 153781

Author(s):

Peiman Aliparast ◽

Mahmoud T. Noghani ◽

Ahad Farhadi ◽

Ali K. Horestani

Keyword(s):

Space Missions ◽

Earth Space ◽

Near Earth Space ◽

Gan Hemt ◽

X Band

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Dynamical evolution of Oort cloud comets to near-Earth space

Proceedings of the International Astronomical Union ◽

10.1017/s1743921307003055 ◽

2006 ◽

Vol 2 (S236) ◽

pp. 43-54 ◽

Cited By ~ 1

Author(s):

Olga A. Mazeeva

Keyword(s):

Dynamical Evolution ◽

Absolute Magnitude ◽

Oort Cloud ◽

Outer Solar System ◽

Earth Space ◽

Near Earth Space ◽

Long Period ◽

Order Of Magnitude ◽

Orbital Periods ◽

Stellar Perturbations

AbstractThe dynamical evolution of 2⋅105 hypothetical Oort cloud comets by the action of planetary, galactic and stellar perturbations during 2⋅109 years is studied numerically. The evolution of comet orbits from the outer (104 AU <a<5⋅104 AU, a is semimajor axes) and the inner Oort cloud (5⋅103 AU <a<104 AU) to near-Earth space is investigated separately. The distribution of the perihelion (q) passage frequency in the planetary region is obtained calculating the numbers of comets in every interval of Δ q per year. The flux of long-period (LP) comets (orbital periods P>200 yr) with perihelion distances q<1.5 AU brighter than visual absolute magnitude H10=7 is ∼ 1.5 comets per year, and ∼18 comets with H10<10.9. The ratio of all LP comets with q<1.5 AU to ‘new’ comets is ∼5. The frequency of passages of LP comets from the inner Oort cloud through region q<1.5 AU is ∼3.5⋅10−13 yr−1, that is roughly one order of magnitude less than frequency of passages of LP comets from the outer cloud (∼5.28⋅10−12 yr−1). We show that the flux of ‘new’ comets with 15<q<31 AU is higher than with q<15 AU, by a factor ∼1.7 for comets from the outer Oort cloud and, by a factor ∼7 for comets from the inner cloud. The perihelia of comets from the outer cloud previously passed through the planetary region are predominated in the Saturn-Uranus region. The majority of inner cloud comets come in the outer solar system (q>15 AU), and a small fraction (∼0.01) of them can reach orbits with q<1.5 AU. The frequency of transfer of comets from the inner cloud (a<104 AU) to the outer Oort cloud (a>104 AU), from where they are injected to the region q<1.5 AU, is ∼6⋅10−14 yr−1.

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