Optimization of Multiple Gravity Assist Trajectories with Deep Space Maneuver Using Evolutionary Algorithms

2020 ◽  
pp. 33-48
Author(s):  
H. R. Sahana ◽  
Pooja Dutt ◽  
A. K. Anilkumar
Keyword(s):  
Evolutionary Algorithms ◽  
Deep Space ◽  
Gravity Assist

scholarly journals A family of low-cost transfer orbits for rendezvous-type missions to NEAs

2006 ◽  
Vol 2 (S236) ◽  
pp. 427-434
Author(s):  
Ştefan Berinde
Keyword(s):  
Relative Velocity ◽  
Velocity Vector ◽  
Low Cost ◽  
Deep Space ◽  
Gravity Assist ◽  
Close Encounters ◽  
The Earth ◽  
Transfer Orbits ◽  
Impulsive Maneuvers

AbstractWe develop a family of transfer orbits suitable for the peculiarity of NEAs orbits. They involve one or more carefully planned deep-space maneuvers and one or more close encounters with the Earth. Basically, it is a gravity assist technique, but only Earth is used as the driving planet. In this manner, the orbit of the spacecraft stays near the Earth, as the orbits of NEAs. The idea is to obtain a large relative velocity in respect to the Earth, using these impulsive maneuvers. Next, successive rotations of this relative velocity vector due to resonant encounters with the Earth will, finally, shape the orbit of the spacecraft, in order to match the inclination and the orientation of apsidal line of the asteroid's orbit.With a velocity budget less than 9 km/s most of NEAs orbits are reachable, even highly inclined ones, or orbits with relatively large nodal distances. An example is given: a rendezvous mission to asteroid (1036) Ganymed.

C. S. Lewis and the Truth about Angels

2013 ◽  
Vol 3 (2) ◽  
pp. 97-110
Author(s):  
Janice Brown
Keyword(s):  
Renaissance Literature ◽  
Scholarly Work ◽  
Deep Space ◽  
The Subject

Lewis’s perspective on angels is apparent in The Discarded Image, his scholarly work on medieval and Renaissance literature. His preface to The Screwtape Letters reveals the seriousness with which he approaches the subject: it proposes that a mistaken view of angelic beings is more dangerous than ignorance of them. The space trilogy seeks to avert that danger. In it we are confronted by angelic eldila—inscrutable and holy beings inhabiting “deep space” who relentlessly accomplish the purposes of the Almighty. Characterized by absolute goodness and archetypal charity, they are serene yet they pulsate with energy. Lewis’s intense interest in angels is further apparent in a number of his poems. Throughout his work he depicts angels as real beings, inhabiting an actual universe, who actually participate our lives. They represent mysterious eternal realities, yet they are part of God’s daily providence.

Deep Space Telecommunications to Drive Hayabusa2 Mission

2018 ◽  
Vol 138 (1) ◽  
pp. 17-20
Author(s):  
Tomoaki TODA ◽  
Yuto TAKEI
Keyword(s):  
Deep Space

A Novel Turbo Coded Modulation Scheme for Deep Space Optical Communications

2010 ◽  
Vol E93.B (5) ◽  
pp. 1260-1263 ◽  
Author(s):  
Sangmok OH ◽  
Inho HWANG ◽  
Adrish BANERJEE ◽  
Jeong Woo LEE
Keyword(s):  
Optical Communications ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Deep Space ◽  
Turbo Coded Modulation

Opponent Center-Surround Contrast: Colour to Grey Conversion

2020 ◽  
Vol 2020 (1) ◽  
pp. 105-108
Author(s):  
Ali Alsam
Keyword(s):  
Evolutionary Algorithms ◽  
Three Dimensional ◽  
The State ◽  
Colour Space ◽  
Vision Science ◽  
State Of Art ◽  
Over Time

Vision is the science that informs us about the biological and evolutionary algorithms that our eyes, opticnerves and brains have chosen over time to see. This article is an attempt to solve the problem of colour to grey conversion, by borrowing ideas from vision science. We introduce an algorithm that measures contrast along the opponent colour directions and use the results to combine a three dimensional colour space into a grey. The results indicate that the proposed algorithm competes with the state of art algorithms.

PVT-Biomass-Battery systems optimized with evolutionary algorithms for small and highly shaded environments

2016 ◽  
pp. 568-573
Author(s):  
J.A. Fernández Fernández ◽  
P. González-Rodelas ◽  
E. Alameda-Hernández
Keyword(s):  
Evolutionary Algorithms ◽  
Battery Systems
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