Comparative Analysis and Simulation of Propulsion and Energy Systems for Satellite Communication

2020 ◽  
pp. 1061-1069
Author(s):  
Jalal Eddine Benmansour ◽  
Boulanouar Khouane ◽  
Tarek Badis
Keyword(s):  
Comparative Analysis ◽  
Satellite Communication ◽  
Energy Systems

Comparative Analysis of Integrated and Nonintegrated Fusion and Fission Energy Systems

1982 ◽  
Vol 80 (4) ◽  
pp. 700-710 ◽  
Author(s):  
K. F. Schoepf ◽  
M. Heindler ◽  
A. A. Harms
Keyword(s):  
Comparative Analysis ◽  
Energy Systems

scholarly journals Comparative analysis of fuel cell and battery energy systems for Internet of Things devices

2020 ◽  
Vol 6 ◽  
pp. 29-35
Author(s):  
Yutaro Akimoto ◽  
Hinato Takezawa ◽  
Yosuke Iijima ◽  
Shin-nosuke Suzuki ◽  
Keiichi Okajima
Keyword(s):  
Comparative Analysis ◽  
Fuel Cell ◽  
Internet Of Things ◽  
Energy Systems ◽  
Battery Energy

scholarly journals Comparative analysis and evaluation of energy policies that support and enhance investments in renewable energy systems

2015 ◽  
Author(s):  
Λύδια Σταμέλου
Keyword(s):  
Renewable Energy ◽  
Comparative Analysis ◽  
Energy Systems ◽  
Energy Policies ◽  
Renewable Energy Systems ◽  
Analysis And Evaluation

Η ταχεία ανάπτυξη τόσο στο ερευνητικό επίπεδο όσο και στο επενδυτικό για τις νέες μεθόδους προϋποθέτει την παρέμβαση του κράτους και μάλιστα με συγκεκριμένο πρόγραμμα στήριξης των ΑΠΕ. Μελετώντας τόσο την βιβλιογραφία όσο και εξετάζοντας τα εμπειρικά δεδομένα απο την πορεία των ΑΠΕ ξεχωριστά ανά κράτος, γίνεται αντιληπτό ότι υπάρχει μια σειρά εργαλείων στήριξης των ΑΠΕ όπου ο εκάστοτε διαφορετικός συνδυασμός δημιουργεί μια διαφορετική πολιτική στήριξης και έχει ξεχωριστά αποτελέσματα. Είναι σύνηθες η κάθε χώρα να υιοθετεί μέτρα τα οποία καλύπτουν και ανταποκρίνονται στις ιδιαιτερότητες της και δεν συσχετίζονται με τα μέτρα των άλλων χωρών. Γεγονός το οποίο συμβάλλει στην δημιουργία μιας σημαντικής βάσης εμπειρικών δεδομένων που μπορούν να ενισχύσουν κάθε ερευνητική ανάλυση.Οριοθετούμε την έρευνα μας στις πολιτικές στήριξης οι οποίες έχουν εφαρμοσθεί για την εγκατάσταση σύγχρονων τεχνολογιών που εκμεταλλεύονται την ηλιακή ενέργεια, δηλαδή των Φωτοβολταϊκών συστημάτων (φ/β). Η ηλιακή ενέργεια είναι μια «σταθερή» πηγή ενέργειας η οποία έχει συγκεντρώσει το ενδιαφέρον πολλών χωρών. Όπως γίνεται αντιληπτό απο την πορεία της τεχνολογικής προόδου η τεχνολογία των φωτοβολταικών εγκαταστάσεων πάρα το γεγονός ότι βαίνει συνεχώς βελτιούμενη, εντούτοις δεν έχει φτάσει στο ανώτερο δυνατό σημείο.

Comparative analysis of Luneberg spherical lens designs

2021 ◽  
Vol 8 ◽  
pp. 91-100
Author(s):  
M.P. Belyaev ◽  
Yu.G. Pasternak ◽  
V.A. Pendyurin ◽  
E.A. Rogozin ◽  
R.E. Rogozin
Keyword(s):  
Comparative Analysis ◽  
Communication Systems ◽  
Satellite Communication ◽  
Practical Importance ◽  
Effective Dielectric Constant ◽  
Cnc Machine ◽  
New Production ◽  
Technical Requirements ◽  
Artificial Environment ◽  
Luneberg Lens

Formulation of the problem. The development of modern mobile satellite communication systems dictates the need for the development of multipath antennas having: high values of the directional coefficient, low level of side lobes, a large number of scanning beams in a wide viewing sector without distortion in the azimuthal and angular planes. Multipath antenna systems based on spherical Luneberg lenses have these advantages. Despite their advantages, the spherical lenses of Luneberg did not find wide practical use due to the complexity of the design, the high cost of production, and the large mass (in some cases). Thanks to the progress in the field of artificial media, the emergence of new production methods, various designs of spherical Luneberg lenses have been developed. The use of artificial dielectrics allows you to create inexpensive, lightweight spherical Luneberg lenses. One widely used method of creating an artificial environment is to use partial air filling dielectrics. Luneberg lenses based on such media can have various designs: based on a dielectric ball with radial holes of variable diameter, from electrically small dielectric cubes of variable size, from a set of perforated dielectric disks, etc. For the manufacture of such lenses, various manufacturing technologies can be used, for example, three-dimensional printing, CNC machine. Purpose. Comparative analysis of the characteristics of two structures of the spherical Luneberg lens with the aim of working at frequencies above 9 GHz: from a set of perforated dielectric disks, from dielectric cubes of different sizes. Results. The results of comparative analysis of two designs of the spherical Luneberg lens are presented. The procedure of synthesis of each structure is considered. Design dependencies of effective dielectric constant used in development of investigated spherical lenses of Luneberg are given. Possible methods of technical implementation for each lens are considered, as well as important features that should be taken into account when designing and technical implementation. The weight of each structure was estimated. Conclusions about mechanical strength were made. Based on numerical modeling using the Weyland method, a comparison of directional properties in a wide frequency band was made. Conclusions have been drawn about the similarity and difference in directional characteristics. Practical importance. The scientific and technical results obtained in the article will be useful in choosing the design of the Luneberg lens from artificial dielectrics, depending on the specified technical requirements, and production conditions.

scholarly journals Techno-Economic Comparative Analysis between Grid-Connected and Stand-Alone Integrated Energy Systems for an Educational Institute

Evergreen ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 382-395
Author(s):  
Siva Subrahmanyam Mendu ◽  
Padmaja Appikonda ◽  
Anil Kumar Emadabathuni
Keyword(s):  
Comparative Analysis ◽  
Energy Systems ◽  
Integrated Energy Systems ◽  
Educational Institute
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