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Academic literature on the topic 'Yohkoh (Solar-A) Mission (Project)'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2023

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Journal articles on the topic "Yohkoh (Solar-A) Mission (Project)"

1

Doschek, G. A. "Recent Advances in EUV Solar Astronomy." International Astronomical Union Colloquium 152 (1996): 503–10. http://dx.doi.org/10.1017/s0252921100036460.

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I discuss recent advances in EUV solar astronomy. The new work is primarily a result of current solar space missions such as the Yohkoh high energy solar physics mission, as well as upcoming space missions such as the ESA Solar and Heliospheric Observatory (SOHO). I discuss spectroscopic and atomic physics work, and new results concerning solar flares that are directly relevant to stellar research.

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Hudson, Hugh S. "Spatial Resolution of Solar Total Irradiance Variability: The YOHKOH White-Light Observations." International Astronomical Union Colloquium 143 (1994): 196–205. http://dx.doi.org/10.1017/s0252921100024696.

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The observations from the ACRIM instrument on board the Solar Maximum Mission, and other recent experiments, have allowed us to study the time variations of solar irradiance. These observations identified several mechanisms, ranging from sunspots to global oscillations produced by waves trapped in the solar interior (the p-modes) that cause variations in the total irradiance. In all cases the variations have small amplitudes in integrated light from the visible photosphere. The SXT instrument on board Yohkoh has provided a new data set that can resolve some of these variations spatially. Most of these data are in the form of whole-Sun images: rate about 5 per day; effective pixel size of 4.92 arc sec; passband 28Å centered at 4310Å; data interval beginning in September, 1991 and ending in October, 1992. These observations have several advantages over ground-based observations for the characterization of solar global variability, namely the lack of atmospheric effects and the long-term stability of the instrumentation. We present an assessment of these data in the context of the existing total irradiance data, and also discuss their application to determination of the figure of the Sun, particularly measurements of the variations of the solar radius.

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3

Turck-Chieze, S., R. Bocchia, P. Boumier, M. Cantin, J. Charra, B. Cougrand, J. Cretolle, et al. "The spatial Golf project." International Astronomical Union Colloquium 147 (1994): 532–36. http://dx.doi.org/10.1017/s0252921100026543.

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AbstractThis spatial experiment is under construction and has been defined as a 2 years mission on board SOHO, a satellite dedicated to the Sun which will be launched in mid 95. The main objectives are the detection of solar low degree acoustic modes and solar gravity modes for improving our knowledge of the solar nuclear region.

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Ali, Essam, Mohamed Fanni, and Abdelfatah M. Mohamed. "Design and task management of a mobile solar station for charging flying drones." E3S Web of Conferences 167 (2020): 05004. http://dx.doi.org/10.1051/e3sconf/202016705004.

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This paper provides design and task management of the first stage of a project entitled “Fall-Army Worm (FAW) insect killer”. The project has three main stages: design and energy management stage, flying control of drone stage and detecting and killing FAW stage. The goal of this project is to detect and kill; without chemical methods; a harmful FAW insect which is rapidly spreading in Africa and Asia. This paper focuses on design of the first stage of the system, getting maximum power and controlling the energy of the system. A Photo Voltaic system with energy storage devices is proposed to be the source of power. A new algorithm to control the time scheduling of the killing and detection mission is proposed and its effects on the system’s energy and mission period are studied. A comparison between different methods for tracking the maximum power from PV panels is performed to choose the best (less time and high accuracy) method. The results of simulation indicate the effectiveness of the proposed maximum power tracking and task management system.

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Buzasi, Derek L. "Building a Large Solar Analog Sample Using K2." Proceedings of the International Astronomical Union 13, S340 (February 2018): 233–34. http://dx.doi.org/10.1017/s1743921318001230.

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AbstractWe have begun a project aimed at providing a large consistent set of well- vetted solar analogs in order to address questions of stellar rotation, activity, dynamos, and gyrochronology. We make use of the K2 mission fields to obtain precise photometric time series, supplemented by ground-based photometric and spectroscopic data for promising candidates. From this data we will derive rotation periods, spot coverages, and flare rates for a well- defined and well-calibrated sample of solar analogs.

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Neukum, G. "The Planetenteleskop Mission." International Astronomical Union Colloquium 123 (1990): 286. http://dx.doi.org/10.1017/s0252921100077149.

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AbstractThe scientific focus of the Planetenteleskop project will be on time-variable solar system phenomena (planet-magnetosphere-satellite interactions, active processes of cometary nuclei, atmospheric circulation and dynamics), on time-invariant solar system phenomena (geochemical provinces on planetary and satellite surfaces, global characteristics of primitive bodies), on planetary environments of other stars, and on general astronomical and astrophysical applications. The proposed Planetenteleskop in elliptical 24 h earth orbit will combine near-simultaneous, high-resolution spectroscopic observations, diffraction-limited imaging quality, long integration times (< 10 h) and excellent target tracking accuracy (nominally 0.05 arc sec/10 h, up to 0.02 arc sec). The excellent tracking accuracy and stability on extended objects and features is provided by a novel real-time on-board image correlation scheme. The Planetenteleskop has been studied in prephase A and phase A by industry and the involved science community in Germany in cooperation with American colleagues.

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da Silva, José Roberto Cândido, and Gefeson Mendes Pacheco. "An Extended Methodology for Sizing Solar Unmanned Aerial Vehicles: Theory and Development of a Python Framework for Design Assist." Sensors 21, no. 22 (November 12, 2021): 7541. http://dx.doi.org/10.3390/s21227541.

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There is a growing interest in using unmanned aerial vehicles (UAVs) in the most diverse application areas from agriculture to remote sensing, that determine the need to project and define mission profiles of the UAVs. In addition, solar photovoltaic energy increases the flight autonomy of this type of aircraft, forming the term Solar UAV. This study proposes an extended methodology for sizing Solar UAVs that take off from a runway. This methodology considers mission parameters such as operating location, altitude, flight speed, flight endurance, and payload to sizing the aircraft parameters, such as wingspan, area of embedded solar cells panels, runway length required for takeoff and landing, battery weight, and the total weight of the aircraft. Using the Python language, we developed a framework to apply the proposed methodology and assist in designing a Solar UAV. With this framework, it was possible to perform a sensitivity analysis of design parameters and constraints. Finally, we performed a simulation of a mission, checking the output parameters.

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A’Hearn, Michael F. "The Deep Impact Project." Highlights of Astronomy 13 (2005): 746–48. http://dx.doi.org/10.1017/s1539299600017007.

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AbstractThe Deep Impact mission aims at understanding the third dimension of a cometary nucleus, the physical and chemical properties as a function of depth below the surface. General wisdom holds that comets, because they are small and spend most of their lives far from the sun, hold primordial ices in their interiors. However, it is universally agreed that the surface layers have evolved, whether from cosmic rays while residing in the Oort cloud or from solar heating during previous perihelion passages. Clearly, in order to interpret surface observations and outgassing, we must understand how the surface layers differ from the interior. Deep Impact is the first mission to carry out a macroscopic experiment on a planetary body since the Apollo program dropped a lunar module on the moon and measured the seismic response.

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Longwe, B., M. Mganga, and N. Sinyiza. "Review of sustainable solar powered water supply system design approach by Water Mission Malawi." Water Practice and Technology 14, no. 4 (November 20, 2019): 749–63. http://dx.doi.org/10.2166/wpt.2019.079.

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Abstract Water Mission's extensive experience in designing, constructing and supporting solar-powered pumping solutions demonstrates the technological viability and cost effectiveness for delivering safe water to people, particularly in rural areas. Water Mission follows a unique design approach that uses conventional but relatively unique engineering specifications in terms of hydraulics, power requirement, water treatment and distribution, having tested them in different geographical environments. Water Mission incorporates a community-managed sustainability model into the design to ensure a longer life span for the project by promoting a well-defined maintenance and sustainability plan. This approach was applied to ten projects in 2015 in Kasungu, Lilongwe and Blantyre districts where installation, monitoring and evaluation were done and subjected to Water Mission's standards for qualification to hand them over to the beneficiary communities at the end of one year post installation. The paper is a review and discussion of the steps that Water Mission follows in its design process to come up with a sustainable project with solar energy. The paper also illustrates the non-compromise stand by Water Mission when it comes to the hand-over criteria for its projects by following and respecting the results of the prescribed evaluation test. It highlights detailed advantages and disadvantages of the design approach and presents recommendations. It is concluded that the approach can be replicated elsewhere in Malawi as a solution to water supply.

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Lindegren, Lennart. "Gaia: Astrometric performance and current status of the project." Proceedings of the International Astronomical Union 5, S261 (April 2009): 296–305. http://dx.doi.org/10.1017/s1743921309990548.

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AbstractThe scientific objectives of the Gaia mission cover areas of galactic structure and evolution, stellar astrophysics, exoplanets, solar system physics, and fundamental physics. Astrometrically, its main contribution will be the determination of millions of absolute stellar parallaxes and the establishment of a very accurate, dense and faint non-rotating optical reference frame. With a planned launch in spring 2012, the project is in its advanced implementation phase. In parallel, preparations for the scientific data processing are well under way within the Gaia Data Processing and Analysis Consortium. Final mission results are expected around 2021, but early releases of preliminary data are expected. This review summarizes the main science goals and overall organisation of the project, the measurement principle and core astrometric solution, and provide an updated overview of the expected astrometric performance.

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Books on the topic "Yohkoh (Solar-A) Mission (Project)"

1

T, Watanabe, Kosugi Takeo, Sterling Alphonse C, and Yohkoh Fifth Anniversary Symposium (1996 : Tokyo, Japan), eds. Observational plasma astrophysics: Five years of Yohkoh and beyond. Dordrecht: Kluwer Academic, 1998.

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2

International Symposium on the Yohkoh Scientific Results (1993 Sagamihara-shi, Japan). X-ray solar physics from Yohkoh: Proceedings of the International Symposium on the Yohkoh Scientific Results : February 23-25, 1993, Sagamihara Kokumin Seikatsu Center, Sagamihara, Kanagawa. Tokyo, Japan: Universal Academy Press, 1994.

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3

G.S. Vaiana Memorial Symposium (1992 Palermo, Italy). Physics of solar and stellar coronae: Proceedings of a conference of the International Astronomical Union, held in Palermo, Italy, 22-26 June, 1992. Dordrecht: Kluwer, 1993.

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4

1941-, Linsky J. L., Serio Salvatore, and International Astronomical Union, eds. Physics of solar and stellar coronae: G.S. Vaiana Memorial Symposuim : proceedings of a conference of the International Astronomical Union, held in Palermo, Italy, 22-26 June, 1992. Dordrecht: Kluwer Academic Publishers, 1993.

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5

Švestka, Zdeněk, and Yutaka Uchida, eds. The Yohkoh (Solar-A) Mission. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7.

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6

Leonard, Culhane J., and Jordan C, eds. The physics of solar flares: Proceedings of a Royal Society Discussion Meeting held on 13 and 14 March, 1991. London: Royal Society, 1991.

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7

Zdeněk, Švestka, and Uchida Y, eds. The Yohkoh (Solar-A) Mission: A series of invited contributions. Dordrecht: Kluwer Academic Publishers, 1991.

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8

(Editor), Tetsuya Watanabe, Takeo Kosugi (Editor), and Alphonse C. Sterling (Editor), eds. Observational Plasma Astrophysics: Five Years of Yohkoh and. Springer, 1998.

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9

Bentley, R. D. Magnetic Reconnection in the Solar Atmosphere: Proceedings of a Yohkoh Conference Held in Bath, England, 20-22 March 1996 (Astronomical Society of the Pacific Conference Series). Astronomical Society of the Pacific, 1996.

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10

D, Bentley R., Mariska John T, and Yohkoh Conference (1996 : Bath, Eng.), eds. Magnetic reconnection in the solar atmosphere: Proceedings of a Yohkoh conference held in Bath, England, 20-22 March 1996. San Francisco, Calif: Astronomical Society of the Pacific, 1996.

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Book chapters on the topic "Yohkoh (Solar-A) Mission (Project)"

1

Ogawara, Y., T. Takano, T. Kato, T. Kosugi, S. Tsuneta, T. Watanabe, I. Kondo, and Y. Uchida. "The SOLAR-A Mission: an Overview." In The Yohkoh (Solar-A) Mission, 1–16. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7_1.

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2

Kosugi, T., K. Makishima, T. Murakami, T. Sakao, T. Dotani, M. Inda, K. Kai, et al. "The Hard X-ray Telescope (HXT) for the SOLAR-A Mission." In The Yohkoh (Solar-A) Mission, 17–36. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7_2.

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3

Tsuneta, S., L. Acton, M. Bruner, J. Lemen, W. Brown, R. Caravalho, R. Catura, et al. "The Soft X-ray Telescope for the SOLAR-A Mission." In The Yohkoh (Solar-A) Mission, 37–67. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7_3.

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4

Yoshimori, M., K. Okudaira, Y. Hirasima, T. Igarashi, M. Akasaka, Y. Takai, K. Morimoto, et al. "The Wide Band Spectrometer on the SOLAR-A." In The Yohkoh (Solar-A) Mission, 69–88. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7_4.

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5

Culhane, J. L., E. Hiei, G. A. Doschek, A. M. Cruise, Y. Ogawara, Y. Uchida, R. D. Bentley, et al. "The Bragg Crystal Spectrometer for SOLAR-A." In The Yohkoh (Solar-A) Mission, 89–104. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7_5.

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Morrison, M. D., J. R. Lemen, L. W. Acton, R. D. Bentley, T. Kosugi, S. Tsuneta, Y. Ogawara, and T. Watanabe. "SOLAR-A Reformatted Data Files and Observing Log." In The Yohkoh (Solar-A) Mission, 105–10. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2626-7_6.

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7

Kienreich, I. W., N. Muhr, A. M. Veronig, D. Berghmans, A. De Groof, M. Temmer, B. Vršnak, and D. B. Seaton. "Solar TErrestrial Relations Observatory-A (STEREO-A) and PRoject for On-Board Autonomy 2 (PROBA2) Quadrature Observations of Reflections of Three EUV Waves from a Coronal Hole." In The PROBA2 Mission, 201–19. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-8187-4_12.

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Conference papers on the topic "Yohkoh (Solar-A) Mission (Project)"

1

Leon Delgado, Alexis, Alex Carmona Peña, Yi Qiang Ji Zhang, Arnau Torrent Duch, Jordi Grau Rifà, and Adrià Barja Peláez. "A multi-project student space association." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.060.

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The aerospace sector has always been a challenge. The complex nature of the field requires for talented, skilful engineers. And while the university does great on the development of the theoretical background, it barely gets into the practical application. This is why embracing educational activities is critical to help students develop their technical and teamwork skills in the professional sector. UPC Space Program is an engineering student association based in the Terrassa campus of the Polytechnical University of Catalonia (Spain), and formed by 5 missions and 80 members. Each mission targets a field of interest in the space sector: rocketry, UAVs for space exploration, High Altitude Balloons, rovers and CubeSats. The sharing of the common spaces by such a number of people who are working on so many and diverse projects creates a vibrant and creative environment that incites learning. Our work is aligned with the current activities in the space sector. As the exploration of the terrestrial bodies of the Solar System highly benefits from the use of rovers, our Grass mission is focused on the development of planetary exploration rovers. After achieving 10th place in the European Rover Challenge 2021, the objective is to further upgrade the vehicle for the next edition. But currently, a new exploration focus is appearing as flying vehicles are entering the stage. In this context, our Aldora mission is based around a concept mission to Titan via an autonomous plane capable of deploying scientific probes. Obviously, space exploration is not possible without the presence of space transport vehicles. In this matter, Ares mission is focused on the development of High Power amateur rockets. Currently, Ares is developing a supersonic rocket set to participate in EUROC 2022 competition. But most of the payloads carried by rockets are satellites. In this field, the Horus mission aims to investigate and optimize the manufacture of a CubeSat, along with mission performance, to create a fully operational satellite, currently set to participate in the Europe to Space competition. Finally, there is yet another way to perform space science. Our Zephyros mission works in the development of High Altitude Balloons, also developing a set of experiments to test in near-space conditions. The next objective is to achieve the first student-developed zero pressure balloon in Spain

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2

Rios, Jaime, Carlos Velazquez, Teddy Rakotomanana, Mehdi Kabir, and Jiajun Xu. "Generative Design of a Novel Additively Manufactured Solar Array System for Powering Space Equipment on the Lunar Surface." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71221.

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Abstract The moon poses harsh conditions including excessively cold 14-day nights in some locations. However, the South Pole of the moon receives sunlight 100% of the time in summer and 70% of the time in Winter. NASA is, therefore, seeking to land at the South Pole by 2024 under Artemis missions and deploy solar arrays to power landers, rovers, and other equipment in order to facilitate a sustainable presence on the moon. Artemis project also seeks to lay the groundwork for a crewed mission to the Mars. To meet the NASA needs for Artemis mission, the desired solar array system is required to cover a large surface area to maximize the capture of solar irradiance when the arrays are deployed 10 meters above the lunar terrain. Additionally, the design must be lightweight, capable of being redeployed and retracted with minimal human interaction, and can withstand lunar dust, radiation, and extreme temperatures. In the present study, a scale-down working model of the prototype (1:10th scale) is introduced with a particular emphasis on the mechanical mechanisms of telescopic boom, tower, and deployment/retraction of solar arrays. The solar arrays are encased in a cylinder that sits atop the telescopic boom and can be deployed irrespective of the boom height. This study attempts to use principles of Geometric Origami to create a novel structural design that allows for a large-diameter array to be rigid without a supporting skeletal structure. By removing the rigid supporting structure, the design becomes highly portable and easily packable and deployable. Once the design is finalized, Fusion360’s Generative Design Suite will be used to optimize the strength-to-weight ratio and manufacturability. Conducting topology optimization based on finite element modeling to meet the required criteria on the weight, strength, durability, and rigidity leads often to irregular geometries which are not possible to be fabricated using conventional manufacturing. However, additive manufacturing features the ability to develop and fabricate the proposed innovative design.

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3

Mertz, George A., Gregory S. Raffio, Kelly Kissock, and Kevin P. Hallinan. "Conceptual Design of Net Zero Energy Campus Residence." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76199.

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In response to both global and local challenges, the University of Dayton is committed to building a net-zero energy student residence, called the Eco-house. A unique aspect of the Eco-house is the degree of student involvement; in accordance with UD’s mission, interdisciplinary student teams from mechanical engineering, civil engineering and the humanities are leading the design effort. This paper discusses the conceptual design of a net-zero energy use campus residence, and the analysis completed thus far. Energy use of current student houses is analyzed to provide a baseline and to identify energy saving opportunities. The use of the whole-system inside-out approach to guide the overall design is described. Using the inside-out method as a guide, the energy impacts of occupant behavior, appliances and lights, building envelope, energy distribution systems and primary energy conversion equipment are discussed. The design of solar thermal and solar photovoltaic systems to meet the hot water and electricity requirements of the house is described. Eco-house energy use is simulated and compared to the energy use of the existing houses. The analysis shows the total source energy requirements of the Eco-house could be reduced by about 340 mmBtu per year over older baseline houses, resulting in CO2 emission reductions of about 54,000 lb per year and utility cost savings of about $3,000 per year. Detailed cost analysis and cost optimization have not been performed but are critical aspects of the UD Eco-house project, which will be performed in the future.

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Hirsch, Tobias, Camille Bachelier, Jürgen Dersch, Markus Eck, Jan Fabian Feldhoff, J. García-Barberena Labiano, Christian Gertig, David Kretschmann, and Gabriel Morin. "Guidelines for CSP Yield Analysis: Definition of Elementary Terms." In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18136.

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With the success of CSP technology in the last years more players are active in the market, inducing the need for harmonization of technical terms and methodologies. The mission of the SolarPACES “guiSmo” project which was started in 2010 is to develop a guideline for CSP yield analysis [1]. Activities carried out so far have shown that people have different understandings of many terms used in daily CSP practice. Especially for the development of guidelines, the essential terms need to be clearly defined in order to avoid inconsistencies within the same project. A first version of a nomenclature has been compiled by the “guiSmo” team and will undergo final discussion. The aim is to come to a harmonized version by Summer 2013 which will then be presented at the ASME Energy Sustainability conference. The compilation so far includes essential definitions of terms like direct normal irradiance, incident angles, heat flows, and efficiencies on a system level. The definitions presented will be discussed together with existing standards like the ISO 80000 (physical quantities and units of measurement), the ISO 9488 (Solar energy-vocabulary) and other relevant sources. Although the list of terms is primarily put together for the work in the “guiSmo” project, it might serve as a basis for standardization in the official councils. An international group of solar experts is involved in the preparation of the document in order to ensure high quality and international support for the results.

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Zuegner, Mario Andre. "Ice moon research – A phenomenon called plume." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.102.

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Based on the observations of the Cassini-Huygens space exploration mission, Saturn's moon Enceladus was found to be a very promising subject in the solar system for further exploration and follow-up research, especially focusing on the potential of extraterrestrial life and its origin. Near its South Pole, fountains, specified plumes, consisting mostly of water vapor and small salt-rich ice grains with intermittent activity were observed at the surface. With supersonic speed the water vapor is exiting the trenches known as Tiger Stripes. The driving force of these plumes are not completely understood yet. In current models, Enceladus is expected to consist of a rocky core, surrounded by an ocean of liquid water and covered by a layer of ice. The observed phenomenon is assumed to be caused by the tidal forces that act upon Enceladus. However, several models try to describe the underlying physical processes. Various investigations have recognized the astrobiological potential of Enceladus, even proposed a concept for a sample return for further research in relation to the subsurface ocean. Cassini ́s existing analysis already identified CH4, CO, CO2, simple and complex organics at an altitude of approximately 190 km which allow the assumption of supersonic speeds. That said, the goal of our experiment is to gain further indices/evidence to support the current models of the plumes. Our experiment takes place on a sounding rocket which gives access to a stable vacuum and microgravity in addition. The achieved altitude with its physical environment provides almost the conditions at Enceladus related to the gravitation. The rocket module contains a pressurized and heated water reservoir which is connected via an injection system with the evaporation chamber. On the top a convergent-divergent nozzle is welded. Furthermore a nozzle cover system and a locking mechanism are integrated. At apogee, the nozzle shall be opened and the fluid stream (assumingly made up of ice, water droplets and vapor) shall exit the module at about Mach 2. The necessary fluid-dynamic data is gathered by multiple temperature and pressure measurements at different points on the module. So, the vapor stream shall be compared to the expectations based on the models. Finally it is to mention that our project is still running and waiting for its launch. Caused through the Corona crisis and the Ukraine war the launch cycle was canceled two years in succession. With much luck the rocket will launch in March 2023.

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6

Bermejo Ballesteros, Juan, José María Vergara Pérez, Alejandro Fernández Soler, and Javier Cubas Cano. "Mubody, an astrodynamics open-source Python library focused on libration points." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.040.

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Mubody is an astrodynamics open-source Python library focused on the libration points. Such points result from the equilibrium of the gravitational forces between two massive bodies as the Sun and Earth, for example. The library is mainly intended for the generation of orbits in these regions, which is not a straightforward process, specially if perturbations are considered. Currently, the library allows to generate Lissajous orbits in the second Lagrange point of the Sun-Earth system under the influence of perturbations such as the Earth orbit eccentricity. The next milestone, as a result of a master student work, is the incorporation of Halo orbits and the expansion to all three collinear libration points from any two massive bodies of the Solar System. This tool has been developed as part of a PhD, motivated by the need of performing mission analysis in libration point regions. Nevertheless, since its creation it has also proven to be an excellent academic tool for both enhancing the library itself and using its results for further studies (collision risk, thermal analysis, formation flight control, etc). As a result, the tool has rapidly evolved, building onto the knowledge and experience that the students gather while working on their academic projects (bachelor’s degree dissertations, master theses, subjects, internships). The participation on the library development provides students with experience in orbital mechanics, software design, version control and it compels them to ensure that their work can be readily used by others as it is properly documented. The project is hosted in GitLab under a MIT licence

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7

Leemans, Adam, Martin Baker, Gunnar Tamm, Daniel Andrews, Elsa Johnson, Brendan Hickey, and Nathaniel Martins. "Energy Security Analysis for West Point Training Camps." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6682.

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The United States Military Academy has been charged with reaching Net Zero Energy consumption by 2020. Feasibility assessments to this point have neglected the field facilities used for military training, which are remote locations susceptible to power loss and subject to a higher rate structure for electricity than the rest of the installation. An energy security analysis methodology is described and applied to the training camps at West Point. This began with identifying the mission of the camps and critical power needs based on discussions with the customer, the Director of Cadet Military Training. Details of power and energy usage along with supply and delivery cost structure were provided by the utility and the facility Energy Manager. Conventional and renewable resource potentials were assessed to meet the load profile within financial constraints and funding opportunities unique to a federal government agency. The final recommendation is to incorporate three different technologies: a 50 kW photovoltaic solar system installed through a power purchase agreement, two small scale hydropower systems totaling 30 kW, and a lake based cooling system to provide air conditioning. The installation of these three systems would move the installation closer to the Net Zero Energy goal and lower the energy requirements to provide cooling. Altogether the proposed project would pay back in 16 years with an expected lifespan of 20–30 years. Batteries, generators, and pumped hydro were also examined as possible energy storage options and to shave the peak electrical load. However, the lack of on peak/off peak pricing made these options less viable. These recommendations will increase West Point’s energy security, progress towards the Net Zero Energy goal, and provide cost savings over current utility expenditures.

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Petersen, Christian, Ola Strand, Espen Sten Johansen, Dag Almar Hansen, Dag Ketil Fredheim, and Per Ohlckers. "Pact All Electric - One Step Closer to Autonomy." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207901-ms.

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Abstract E&P companies are increasingly challenged with cost-effective development or upgrade of remote fields, ensuring crew safety and regulatory requirements for reducing environmental impact. Remote operations and unmanned platforms have significantly lower CO2 emissions and lowerCAPEX and OPEX in areas of sparse infrastructure. Complete electrification of safety critical control systems is key to maintain safe production while digitization, automation and condition based maintenance reduce required on-site personnel. An all-electric wellhead- and production tree valve actuator for handling emergency situations has been developed under a Joint Industry Project by Equinor, Baker Hughes and TECHNI. PACT utilize a completely new, patent pending failsafe mechanism that is inherently safe without requirement for redundancy. PACT contains an embedded controller and sensors with extremely low power consumption rendering it well suited for solar/alternate power sources. A new super-capacitor is under development in partnership with the University of Southeast Norway, that in combination with the fastest failsafe mechanism ever ensure safety in all modes of operation, even with all lines down or consumed by flames. Electric actuators offer significant CAPEX savings over hydraulic actuators by eliminating costly hydraulic control systems and hydraulic lines as well as saving space and weight. Overall system cost is significantly lower than hydraulic systems (Equinor estimates at around USD 2million per well for an unmanned platform) while also reducing emissions and environmental impact. Globally, there are approximately 7000 offshore platforms of which 1600 are unmanned (200 in the Middle East). The existing population of unmanned platforms is undergoing continual upgrades and there are significant cost savings by using the PACT as a drop-in replacement for existing hydraulic systems, while enabling fully digitized, remote control and autonomous operations. Low power consumption, weight and a small footprint renders it equally suited for land wells, including retrofit upgrades without reinforcing infrastructure. PACT is designed to be an integral part of automated and remote-control systems and the modular technology is also being adopted for subsea trees, as well as other mission critical pressure control applications. Given the significant benefits in simplifying operations and reducing cost while improving HSSE, leading E&P companies including Equinor, Total, Aker BP and others have chosen electric operations as future technology platform for both topside and subsea operations. Embedded force-, pressure-, temperature- and vibration sensors enable data-driven, fact- and condition based maintenance. Aggregating real-time and historical data, component- and system models ensures fully remote/autonomous operation with a digital twin. The novel failsafe-mechanism fronts the most reliable action of all times while the patent pending solution ensures closing times down to 1 second. In 2020 the consortium was awarded USD 950 000 in government support funding and in May 2021 PACT won OTC Spotlight on New Technology award. The paper aims to show how the technology works and underline why it will take a place in the future of well control and production.

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