Preliminary Estimation of Launch Mass for a Direct Transfer Earth-Uranus Mission
Gisa Geoson Suseela,
Yadu Krishnan Sukumarapillai,
Hariprasad Thimmegowda,
Manjunath Nagendra,
Tamore Silviya Dhiraja,
Pavan Kalyan Devaiah
Issue:
Volume 10, Issue 4, August 2022
Pages:
89-98
Received:
25 May 2022
Accepted:
11 July 2022
Published:
24 August 2022
DOI:
10.11648/j.sr.20221004.11
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Views:
Abstract: A mission to Uranus facilitates a thorough examination of Uranus, its rings, satellites, and other planetary objects. To travel from Earth to any other planet, a variety of approaches can be used. Despite the standard gravity assist methods to reach the ice-giant Uranus, a direct transfer mission is also feasible. This work provides an overview of the preliminary estimation of the launch mass for a direct transfer mission. The departure year 2022-2030 is considered for this study. The payload and spacecraft subsystems for the proposed mission were selected based on past interplanetary missions. The estimated mass of the scientific instrument of this work was found to be 147.5 Kg. The mass of the payload is 11% of the spacecraft's dry mass. The delta-V for the various departure years is obtained using Lambert’s problem for the different time frames. Delta-V and the launch mass are calculated for a range of 15.5-8.5 years of time-of-flight. The upper limit of the time-of-flight is selected based on a Hohmann transfer. Launch mass decreases from 15.5-13.5 years of time-of-flight and then increases to a maximum value at 8.5 years. For time-of-flight of 13.5 and 12.5 years, the delta-V and the launch mass obtained are optimum, 6.7 km/s and 1700 kg, respectively. In the period selected, these minimum values are observed for the departure year 2022. The data obtained reveal the feasibility of such a mission in the near future.
Abstract: A mission to Uranus facilitates a thorough examination of Uranus, its rings, satellites, and other planetary objects. To travel from Earth to any other planet, a variety of approaches can be used. Despite the standard gravity assist methods to reach the ice-giant Uranus, a direct transfer mission is also feasible. This work provides an overview of ...
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What the Teacher Must Master to Direct the Learning Process
Neel Baez Urena,
Ramon Blanco Sanchez
Issue:
Volume 10, Issue 4, August 2022
Pages:
99-107
Received:
24 May 2022
Accepted:
15 June 2022
Published:
16 September 2022
DOI:
10.11648/j.sr.20221004.12
Downloads:
Views:
Abstract: Determining what the Mathematics teacher must master is a fundamental aspect to specify what the correct preparation of said teacher should be, which is a widely debated topic, on which there are various proposals for action, in each of which can be find positive aspects, despite the different approaches found in the specialized literature, at least there is consensus that such preparation must be composed of mathematical knowledge and didactic knowledge, which is supported by research, experiences and proposals aimed at achieving a good preparation of these professionals; several authors have specified the notion of Pedagogical Content Knowledge for the teaching of Mathematics, understanding as such the mastery of the mathematical content to be explained together with the appropriate didactic procedures to explain said content, other authors refer to the Specific Knowledge of the Content, as the “mathematical knowledge to teach”. The objective of this work is to scientifically argue the domain of epistemological and ontological characteristics of Mathematics, which can allow the teacher to establish the appropriate link between mathematical knowledge and didactic knowledge.
Abstract: Determining what the Mathematics teacher must master is a fundamental aspect to specify what the correct preparation of said teacher should be, which is a widely debated topic, on which there are various proposals for action, in each of which can be find positive aspects, despite the different approaches found in the specialized literature, at leas...
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