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Journal articles on the topic 'Point of sail'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Gong, Shengping, Junfeng Li, and Hexi Baoyin. "Solar sail transfer trajectory from L1 point to sub-L1 point." Aerospace Science and Technology 15, no. 7 (2011): 544–54. http://dx.doi.org/10.1016/j.ast.2010.10.003.

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2

Quarta, Alessandro A., and Giovanni Mengali. "E-Sail Optimal Trajectories to Heliostationary Points." Aerospace 10, no. 2 (2023): 194. http://dx.doi.org/10.3390/aerospace10020194.

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The aim of this paper is to investigate the performance of a robotic spacecraft, whose primary propulsion system is an electric solar wind sail (E-sail), in a mission to a heliostationary point (HP)—that is, a static equilibrium point in a heliocentric and inertial reference frame. A spacecraft placed at a given HP with zero inertial velocity maintains that heliocentric position provided the on-board thrust is able to counterbalance the Sun’s gravitational force. Due to the finite amount of storable propellant mass, a prolonged mission toward an HP may be considered as a typical application of

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3

McInnes, Colin R. "Solar sail trajectories at the lunar L2 Lagrange point." Journal of Spacecraft and Rockets 30, no. 6 (1993): 782–84. http://dx.doi.org/10.2514/3.26393.

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4

Bookless, John, and Colin McInnes. "Control of Lagrange point orbits using solar sail propulsion." Acta Astronautica 62, no. 2-3 (2008): 159–76. http://dx.doi.org/10.1016/j.actaastro.2006.12.051.

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5

Bianchi, Christian, Lorenzo Niccolai, Giovanni Mengali, and Alessandro A. Quarta. "Collinear artificial equilibrium point maintenance with a wrinkled solar sail." Aerospace Science and Technology 119 (December 2021): 107150. http://dx.doi.org/10.1016/j.ast.2021.107150.

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6

Niccolai, Lorenzo, Andrea Caruso, Alessandro A. Quarta, and Giovanni Mengali. "Artificial Collinear Lagrangian Point Maintenance With Electric Solar Wind Sail." IEEE Transactions on Aerospace and Electronic Systems 56, no. 6 (2020): 4467–77. http://dx.doi.org/10.1109/taes.2020.2990805.

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7

Huo, Mingying, He Liao, Yanfang Liu, and Naiming Qi. "The Coupled Orbit-Attitude Dynamics and Control of Electric Sail in Displaced Solar Orbits." International Journal of Aerospace Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/3812397.

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Displaced solar orbits for spacecraft propelled by electric sails are investigated. Since the propulsive thrust is induced by the sail attitude, the orbital and attitude dynamics of electric-sail-based spacecraft are coupled and required to be investigated together. However, the coupled dynamics and control of electric sails have not been discussed in most published literatures. In this paper, the equilibrium point of the coupled dynamical system in displaced orbit is obtained, and its stability is analyzed through a linearization. The results of stability analysis show that only some of the o

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8

Baoyin, Hexi, and Colin R. Mcinnes. "Solar Sail Halo Orbits at the Sun–Earth Artificial L1 Point." Celestial Mechanics and Dynamical Astronomy 94, no. 2 (2006): 155–71. http://dx.doi.org/10.1007/s10569-005-4626-3.

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9

Zhao, Lei, Changqing Yuan, Xiaoming Li, and Jingjiu He. "Multiple Spacecraft Formation Flying Control around Artificial Equilibrium Point Using Propellantless Approach." International Journal of Aerospace Engineering 2022 (May 2, 2022): 1–26. http://dx.doi.org/10.1155/2022/8719645.

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This paper demonstrates a detailed analysis of the feasibility for compact formation system around an L2-type artificial equilibrium point by means of continuous low-thrust propulsion in the hybrid form of solar sail and Coulomb force propulsion. Firstly, in view of non-ideal solar sail, the position of L2-type artificial equilibrium point and numerical periodic orbits around L2 utilized as leader’s nominal trajectory are given. Secondly, considering the external disturbances in the deep space environment, the nonlinear dynamic model of the spacecraft formation system based on the circular res

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10

Affanni, Antonio, Luca Casarsa, Ivan Scagnetto, and Francesco Trevisan. "Acquisition and integration of differential pressure measurements on sails for boat performances improvement." Acta IMEKO 12, no. 4 (2023): 1–8. http://dx.doi.org/10.21014/actaimeko.v12i4.1555.

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In this paper, we integrated within a specifically developed acquisition system, denoted as Oceanus, the measurements from a differential pressure sensor between the two sides of a sail (windward and leeward sides); experiments have been performed using a light jib sail of a 35 feet cruising-racing yacht. We analyzed the correlation between such a signal and other standard signals usually present on board such as boat speed, intensity and direction of apparent or real wind; moreover, data from Inertial Measurement Units are handled. We also considered the Target Data, which depend on the actua

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11

Quarta, Alessandro A., and Giovanni Mengali. "Solar Sail Trajectories to Earth’s Trojan Asteroids." Universe 9, no. 4 (2023): 186. http://dx.doi.org/10.3390/universe9040186.

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The recent discovery of Earth’s second Trojan asteroid (2020 XL5), which will remain in the vicinity of the Sun–[Earth+Moon] triangular Lagrangian point L4 for at least 4000 years, has attracted the attention of the scientific community as a remarkable example of those elusive objects that are the witnesses of the first phase of our Solar System. The possibility that an Earth’s Trojan asteroid (ETa) may represent a pristine record of the initial conditions of the Solar System formation makes these small objects an interesting target for a robotic exploration mission. This paper analyzes orbit-

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12

Lou, Zhangpeng, Kaitian Zhang, Yong Wang, and Qing Gao. "Active Disturbance Rejection Station-Keeping Control for Solar-Sail Libration-Point Orbits." Journal of Guidance, Control, and Dynamics 39, no. 8 (2016): 1917–21. http://dx.doi.org/10.2514/1.g001722.

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13

Ceriotti, Matteo, and Colin R. McInnes. "Natural and sail-displaced doubly-symmetric Lagrange point orbits for polar coverage." Celestial Mechanics and Dynamical Astronomy 114, no. 1-2 (2012): 151–80. http://dx.doi.org/10.1007/s10569-012-9422-2.

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14

Wang, Wei Wei, Ze Chen, Jing Bo Yu, and Man Zhou. "Numerical Simulation on the Multi-Point Forming of Sail Surfaces under Force-Displacement Separated Control." Applied Mechanics and Materials 217-219 (November 2012): 1959–63. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1959.

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The forming and springback of sail surface during the multi-point forming under force-displacement separated control (MPF-FD) was studied. Numerical simulation method was adopted to study the springback of sail surfaces with different radius, sheet thicknesses and forming forces. The results show that the springbacks on two directions influence each other. The springback on the bigger radius direction is on the leading role, and will influence that on the smaller direction. On the direction of the bigger radius, the springback is decreased with the increase of sheet thickness, forming force an

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15

Basu, Indranil, and Jeff Th M. De Hosson. "High Entropy Alloys: Ready to Set Sail?" Metals 10, no. 2 (2020): 194. http://dx.doi.org/10.3390/met10020194.

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Over the past decade, high entropy alloys (HEAs) have transcended the frontiers of material development in terms of their unprecedented structural and functional properties compared to their counterpart conventional alloys. The possibility to explore a vast compositional space further renders this area of research extremely promising in the near future for discovering society-changing materials. The introduction of HEAs has also brought forth a paradigm shift in the existing knowledge about material design and development. It is in this regard that a fundamental understanding of the metal phys

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16

Gong, Shengping, Junfeng Li, and Jules Simo. "Orbital Motions of a Solar Sail Around the L2 Earth–Moon Libration Point." Journal of Guidance, Control, and Dynamics 37, no. 4 (2014): 1349–56. http://dx.doi.org/10.2514/1.g000063.

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17

Tamakoshi, Daisuke, and Hirohisa Kojima. "Solar Sail Orbital Control Using Reflectivity Variations near the Earth–Moon L2 Point." Journal of Guidance, Control, and Dynamics 41, no. 2 (2018): 417–30. http://dx.doi.org/10.2514/1.g002679.

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18

Gao, Chen, Wei Wang, Jianping Yuan, and Linli Guo. "Hybrid Sail Displaced Orbits Around L2 Point in the Elliptic Earth-Moon System." Journal of Guidance, Control, and Dynamics 42, no. 2 (2019): 416–24. http://dx.doi.org/10.2514/1.g003748.

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19

Koblik, V., E. Polyakhova, and L. Sokolov. "Solar sail near the Sun: Point-like and extended models of radiation source." Advances in Space Research 48, no. 11 (2011): 1717–39. http://dx.doi.org/10.1016/j.asr.2011.04.024.

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20

Duan, Xun, Gerard Gómez, Josep J. Masdemont, and Xiaokui Yue. "A picture of solar-sail heteroclinic enhanced connections between Lissajous libration point orbits." Communications in Nonlinear Science and Numerical Simulation 85 (June 2020): 105252. http://dx.doi.org/10.1016/j.cnsns.2020.105252.

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21

Duan, Xun, and Xiaokui Yue. "Research on the Lissajous Trajectory Transfer of Large Area Mass Ratio Solar Sail Spacecraft." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 38, no. 5 (2020): 1054–62. http://dx.doi.org/10.1051/jnwpu/20203851054.

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Considering that the solar sail spacecraft working in the Lissajous orbit will be affected by the shadow of the earth or the solar wind, which sometime makes the spacecraft unable to work, we try to use the solar light pressure as the thrust to carry out the Lissajous orbit transfer in advance. Because the solar pressure parameters(cone angle, clock angle and solar pressure factor) will change the position of the libration points, we propose the idea of splicing the old and new libration point manifolds to transfer the escape spacecraft to the new Lissajous orbit to achieve orbit maintenance.

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22

Shmyrov, Alexander S., Vasiliy A. Shmyrov, and Dmitry V. Shymanchuk. "Controlling the orbital motion of the spacecraft near the libration point by changing the solar sail reflectivity." Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes 20, no. 2 (2024): 298–306. http://dx.doi.org/10.21638/spbu10.2024.214.

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The article considers the strategy of keeping the spacecraft in the vicinity of the unstable Lagrange point (libration point) of the Sun — Earth system. This strategy involves the use of special management. This control acts collinearly to the Sun — Earth line and ensures Lyapunov stability of the orbital motion. The implementation of such control is proposed using a solar sail. The advantages and difficulties of such a strategy are discussed.

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23

Shymanchuk, D. V., A. S. Shmyrov, and V. A. Shmyrov. "Controlled Motion of a Solar Sail in the Vicinity of a Collinear Libration Point." Astronomy Letters 46, no. 3 (2020): 185–92. http://dx.doi.org/10.1134/s1063773720030056.

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24

Hur, S. H., and A. E. Bryson. "Optimal Guidance of a Solar Sail Spacecraft to the Sun-Earth L 2 Point." IFAC Proceedings Volumes 27, no. 13 (1994): 29–34. http://dx.doi.org/10.1016/s1474-6670(17)45774-0.

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25

Quarta, Alessandro A. "Optimal Guidance for Heliocentric Orbit Cranking with E-Sail-Propelled Spacecraft." Aerospace 11, no. 6 (2024): 490. http://dx.doi.org/10.3390/aerospace11060490.

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In astrodynamics, orbit cranking is usually referred to as an interplanetary transfer strategy that exploits multiple gravity-assist maneuvers to change both the inclination and eccentricity of the spacecraft osculating orbit without changing the specific mechanical energy, that is, the semimajor axis. In the context of a solar sail-based mission, however, the concept of orbit cranking is typically referred to as a suitable guidance law that is able to (optimally) change the orbital inclination of a circular orbit of an assigned radius in a general heliocentric three-dimensional scenario. In f

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26

Yu, W., and O. L. Starinova. "Study on Displaced Orbits Below the Moon’s South Pole Near L2 Point Based on Solar Sail." Mekhatronika, Avtomatizatsiya, Upravlenie 24, no. 12 (2023): 652–59. http://dx.doi.org/10.17587/mau.24.652-659.

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This work explores displaced orbits of solar sails below the Moon’s south pole, near the L2 libration point in the Earth-Moon system. Light pressure provides acceleration for displaced orbits. These orbits enable continuous communication and observation of the Moon’s south polar region, where a lunar base is planned. Linearized dynamic equations yield analytical solutions of displaced orbits, which are either quasi-periodic or periodic. Quasi-periodic orbits have varying altitudes of hundreds of kilometers and a period of about a year, while periodic orbits have fixed altitudes аnd the same pe

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27

Yadav, Arun Kumar, Badam Singh Kushvah, and Uday Dolas. "Controlling the libration point orbits for CRTBP with non-ideal solar sail and albedo effect." Chaos, Solitons & Fractals 152 (November 2021): 111387. http://dx.doi.org/10.1016/j.chaos.2021.111387.

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28

Bowater, Laura. "The Great Pox." Microbiology Australia 37, no. 4 (2016): 202. http://dx.doi.org/10.1071/ma16066.

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The 3rd of August 1492 marked the start of one of the most significant periods of global exploration, travel and migration. Setting sail from Palos on the Portuguese coast, Christopher Columbus, sponsored by King Ferdinand and Queen Isabella of Spain, headed westward bound for the Canary Islands. From the Canaries, Columbus continued his voyage. Thirty-five days after setting sail, he reached the Bahamas. His first landing point, on a small island, known as San Salvador, was used by Columbus as a base to explore and map the islands of this New World, before he and his crew returned to Spain in

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29

Abraham, Janaki. "Setting Sail for Lakshadweep: Leela Dube and the Study of Matrilineal Kinship." Indian Journal of Gender Studies 24, no. 3 (2017): 438–54. http://dx.doi.org/10.1177/0971521517716813.

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In this article I engage with Prof. Leela Dube’s fascinating work on matriliny in Lakshadweep which addressed critical questions in anthropology/sociology and feminist studies. Her discussion about the disjuncture between codified Islamic law and practice in relation to marriage and property devolution, her elaboration on the way law was manipulated strategically, and the image of flexibility in kinship practices are all important for a contemporary understanding of matriliny and kinship in general. Similarly, her discussion of what matriliny meant for women and more broadly the intersections

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30

Wang, Hongming, Chen Li, Caibao Zuo, Junfu Yuan, and Binxin Wu. "Computational Fluid Dynamics Investigation of the Spacing of the Aerodynamic Characteristics for Multiple Wingsails on Ships." Journal of Marine Science and Engineering 12, no. 6 (2024): 985. http://dx.doi.org/10.3390/jmse12060985.

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Wind energy, as an inexhaustible energy source, has become a focal point in the development of new energy for ships. Sail-assisted technology, which leverages wind power, has been successfully applied to ship propulsion. The propulsion performance of sail-assisted ships is affected by the interference characteristics among multiple wingsails. To investigate interference characteristics, an arrangement scheme involving two-element wingsails and considering the relative wind direction angle was established. To obtain the inter-stage interference characteristics of wingsails, the Reynolds average

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31

Yakovlev, В. Н. Яковлев. "Tacking a sailing ship in the current." Russian Journal of Water Transport, no. 80 (September 19, 2024): 258–67. http://dx.doi.org/10.37890/jwt.vi80.525.

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It is impossible for a vessel to move under sail directly against the wind. In the case where the destination is directly against the wind, the sailing vessel moves on tacks, the direction of which depends on the type of sailing rig and is on average 45 degrees from the general course for ships with triangular sails. Sometimes tack movement becomes useful for moving along the general course and with a fair wind. Laying out tacks (selecting tacks and points for changing them) is not a simple task and depends on many things, including changes (maybe expected) in the strength and direction of the

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32

CAMPBELL, DOUGLAS A. "Paul in Pamphylia (Acts 13.13–14a; 14.24b–26): A Critical Note." New Testament Studies 46, no. 4 (2000): 595–602. http://dx.doi.org/10.1017/s0028688500000369.

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Acts states in 13.13–14a that Paul sailed on his outward journey from Paphos in Cyprus to Pergê in Pamphylia (Περγη), proceeding then to Pisidian Antioch – literally, Antioch-towards-Pisidia. (Pamphylia is the westernmost of two alluvial coastal shelves on the south coast of present-day Turkey; a relatively self-contained geographical area.) Acts states that John-Mark left for Jerusalem from this point after a disagreement, and also does not mention the coastal port of Attaleia (‘Ατταλεια), present-day Antalya. On the return journey, however, noted in 14.24–26a, the remaining missionaries are

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33

Shymanchuk, D. V., A. S. Shmyrov, and V. A. Shmyrov. "A Maneuver of Escape from the Vicinity of a Collinear Libration Point Using Light Pressure Forces." Письма в Астрономический журнал: Астрономия и космическая астрофизика 49, no. 9 (2023): 612–22. http://dx.doi.org/10.31857/s032001082309005x.

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The orbital motion of a spacecraft with a solar sail in the vicinity of the Sun–Earth collinear libration point is studied. The study is carried out within the Hill approximation of the circular restricted three-body problem. The collinear libration point is unstable, but instability can be a positive factor in the tasks of maneuvering in interplanetary space. This is because a small change in velocity near an unstable libration point can lead to a significant change in orbital motion. This property can be used in the development of projects to counteract the comet–asteroid hazard. A scheme fo

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34

Supriya, R., and Dr R. Jayakanth. "Realising Oneself Amidst the Chaos: An Exploration of the Innerselves of Women Protagonists in Sudha Murty’s Select Novels." International Journal of English Literature and Social Sciences 10, no. 2 (2025): 007–12. https://doi.org/10.22161/ijels.102.2.

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Every individual human being possesses certain abilities which are always unique. There is no necessity to compete with anyone’s ability to prove our individual uniqueness. It is important in life to sustain our uniqueness and never become dependent at any point in life. Sudha Murty, an eminent writer discloses her experiences and observations of society in the art of writing short stories and novels. Being a contemporary writer, her writings are a mere reflection of reality, and always had a vision in all her works. The purpose of this paper is to examine the striking similitude of the women

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35

Yanti, Eka Riski, Harits Dwi Wiratma, and Yeyen Subandi. "Upaya Dinas Pariwisata Dan Ekonomi Kreatif Kabupaten Wakatobi Dalam Meningkatkan Pariwisata Melalui Event Nasional Dan Internasional Di Kabupaten Wakatobi Tahun 2018-2022." Innovative: Journal Of Social Science Research 4, no. 2 (2024): 5432–42. https://doi.org/10.31004/innovative.v4i2.9583.

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Pada tahun 2020 Kementerian Pariwisata dan Ekonomi Kreatif atau Badan Pariwisata dan Ekonomi Kreatif Indonesia menetapkan 10 Destinasi Prioritas Pariwisata (DSP) yang diharapkan mampu menyaingi Bali serta semakin mendorong dan mengembangkan sektor pariwisata dari berbagai wilayah di Indonesia yang mampu mendorong pertumbuhan ekonomi. Salah satu dari 10 DSP adalah Wakatobi. Wakatobi merupakan suatu kabupaten yang berada di Sulawesi Tenggara dengan kekayaan alam berupa terdapat 750 spesies terumbu karang yang membuat Wakatobi dijuluki sebagai Surga Nyata Bawah laut, dan pesona budaya lainnya. Se

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36

Martínez-Sánchez, Dilan Arturo, and Giovanny Jiménez Díaz. "Hydraulic fracturing considerations: Insights from analogue models, and its viability in Colombia." Earth Sciences Research Journal 23, no. 1 (2019): 5–15. http://dx.doi.org/10.15446/esrj.v23n1.69760.

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Fracking is being considered around the world as a potential method in the hydrocarbons extraction given the increase of production in USA and Canada during the last years with its implementation. The most criticized feature of the technique of fracking is the contamination of underground waters by fluids connected through the generated and/or pre-existing fractures. This work evaluates the viability of fracking in Colombian territory based in the study of the analogue models, considering the elastic properties of the reservoir rocks using gelatin, sand and clay that apply scaled pressure (lit

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37

Mansur, Suraya, and Sari Anggaraini Harsono. "Press Release by Medco E&P Malaka on Serambi Indonesia Online News Coverage." Jurnal The Messenger 12, no. 1 (2020): 14. http://dx.doi.org/10.26623/themessenger.v12i1.1412.

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<em>The study aims to analyze the public relations work suitability of PT Medco E&amp;P Malaka related to community empowerment and social responsibility on Education and Training of 40 Acehnese Children in PPSDM-Cepu. International Standard Ambulance given for Pidie Jaya and the support from Medco E&amp;P Malaka in the event Sail Sabang 2018 conducted by the company and press-released by Serambi Indonesia online in 2018. A qualitative approach with a case study method was employed in this study. The results showed that the point of view of journalists/media is dissimilar from th

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38

Ilcev, Stojce Dimov. "The development of maritime radio communications." International Journal of Maritime History 30, no. 3 (2018): 536–43. http://dx.doi.org/10.1177/0843871418784240.

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This paper provides an historical review of maritime mobile radio communications systems as a primary means of ensuring the safety and security of ships at sea. Safety at sea has always been a priority for seamen and shippers. Distress alerts at sea caused by the blind forces of Mother Nature or, more commonly, by human factors have occurred over many centuries, as seafarers often set sail with inadequate information about their course, navigation and weather conditions. Until the late nineteenth century, only audio and visual transfers of information from point to point were used. From then o

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39

Tucci, G., S. Rihal, M. Betti, et al. "GROUND BASED 3D MODELLING (PHOTOGRAMMETRY AND TLS) - SURVEY, DOCUMENTATION AND STRUCTURAL ASSESSMENT OF XX CENTURY CULTURAL HERITAGE IN INDIA – A CASE STUDY OF THE MASONRY VAULTS IN DEHRADUN." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W11 (May 5, 2019): 1105–11. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w11-1105-2019.

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<p><strong>Abstract.</strong> The paper presents the case study of the survey of the sail vaults of the main building of the Forest Research Institute in Dehradun. The building has been acquired with photogrammetric and laser scanner techniques during the Ground Based 3D Modelling (Photogrammetry and TLS) tutorial, at the ISPRS TC V Mid-term Symposium held in Dehradun, India in November 2018. The acquired data was then used for a structural evaluation of masonry vaults. The 3D model, built using the point cloud data, has been used in an open source finite element analysis sof

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40

Shymanchuk, D. V., A. S. Shmyrov, and V. A. Shmyrov. "Stabilization of the Orbital Motion of a Solar Sail in the Vicinity of a Collinear Libration Point through a Change in Reflectivity." Astronomy Letters 48, no. 8 (2022): 469–77. http://dx.doi.org/10.1134/s1063773722080060.

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41

Olsson, Fredrik, Laura Giovannetti, Sofia Werner, and Christian Finnsgård. "A Performance Depowering Investigation for Wind Powered Cargo Ships Along a Route." Journal of Sailing Technology 5, no. 01 (2020): 47–60. http://dx.doi.org/10.5957/jst/2020.3.1.47.

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Abstract. For a sailing yacht, depowering is a set of strategies used to limit the sail force magnitude by intentionally moving away from the point of maximum forward driving force, potentially reducing the ship speed. The reasons for doing this includes among others; reduction of quasi-static heeling angle, structural integrity of masts and sails and crew comfort. For a wind powered cargo ship, time spent on a route is of utmost importance. This leads to the question whether there is a performance difference between different depowering strategies and if so, how large. In this research, a win

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42

Čalić, Ante, Zdeslav Jurić, and Marko Katalinić. "Impact of Wind-Assisted Propulsion on Fuel Savings and Propeller Efficiency: A Case Study." Journal of Marine Science and Engineering 12, no. 11 (2024): 2100. http://dx.doi.org/10.3390/jmse12112100.

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In order to meet current and future efforts to reduce fuel consumption and gas emissions, an increasing number of ships are being retrofitted with one of the wind-assisted propulsion solutions. In this paper, the effects of retrofitted wind-assisted propulsion on the efficiency of the propeller are investigated. The installed ship propeller is usually designed to operate under specific conditions; once the thrust force from the sails is added, the operating point of the propeller changes. Taking into consideration the reduced efficiency of the propeller, which is no longer operating in its opt

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43

Quarta, Alessandro A. "Augmented Hohmann Transfer for Spacecraft with Continuous-Thrust Propulsion System." Aerospace 12, no. 4 (2025): 307. https://doi.org/10.3390/aerospace12040307.

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Hohmann transfer is the classical approach used in astrodynamics to analyze the optimal bi-impulsive transfer, from the point of view of the total velocity change, between two circular, coplanar orbits of assigned radius. The Hohmann transfer is characterized by an elliptical trajectory tangent to both circular orbits at the points where the transfer begins or ends and can be used to simply model, in a Kepler problem, a possible optimal transfer of a spacecraft equipped with a high-thrust propulsion system. Recent literature has proposed a sort of extension of the Hohmann transfer to a helioce

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44

Ritter, Gerson Luis da Silva. "Water velocity estimation using inversion methods." GEOPHYSICS 75, no. 1 (2010): U1—U8. http://dx.doi.org/10.1190/1.3280232.

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It is known that the propagation velocity of sound waves in water can vary over time. For a 3D seismic survey, if data are acquired in adjacent lines but at different dates, this implies the same reflection point will be recorded at different times. To take this effect into account in seismic processing, it is necessary to measure the sound velocity in water. I have developed a 3D tomographic method that directly estimates it. It assumes a constant sound velocity for a group of shots belonging to a single sail line. Using a picked water-bottom reflection and an initial depth and velocity model

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Meireles, Lucas Gouvêa, Vivian Martins Gomes, Antônio Fernando Bertachini de Almeida Prado, and Cristiano Fiorilo de Melo. "Optimum, Suboptimal and Solar Sailing Orbital Maneuvers for a Spacecraft Orbiting the Earth." Symmetry 15, no. 2 (2023): 512. http://dx.doi.org/10.3390/sym15020512.

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The present research performs numerical studies to search for the best maneuvers, from the point of view of minimum time, to make adjustments in the semi-major axis, eccentricity and inclination of a spacecraft traveling around the Earth. For those maneuvers, low thrust propulsion is used under optimal and sub-optimal assumptions, to verify the main differences in terms of transfer time. In addition, solar sail dynamics is used. The spacecraft is assumed to have a propulsion with a fixed magnitude and that the control is based on choosing the direction of the propulsion. It is found that optim

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Herman, Gabriel. "Nikias, Epimenides and the Question of Omissions in Thucydides." Classical Quarterly 39, no. 1 (1989): 83–93. http://dx.doi.org/10.1017/s0009838800040490.

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Our starting point is a somewhat obscure incident which has lately attracted some attention. The year is 429 B.C., and the place is Athens in the third year of the Peloponnesian war. The plague, which had broken out only a year before, was still claiming its victims. Yet military operations were in full swing, and the general Phormio operating in the Corinthian gulf against a Peloponnesian fleet was able to score an impressive victory. The Lacedaemonians were deeply dissatisfied. This was the first sea-fight they had been engaged in, and they found it hard to believe that their fleet was so mu

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De Piante, Marco, Michele Midrio, Roberto Rinaldo, Ivan Scagnetto, Ruben Specogna, and Francesco Trevisan. "Sub-Gigahertz Path Loss Measurement Campaign in Marine Environment: A Case Study." Sensors 24, no. 8 (2024): 2582. http://dx.doi.org/10.3390/s24082582.

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This paper focuses on the characterization of radio propagation, and data communication in a marine environment. More specifically, we consider signal propagation when three different sub-gigahertz industrial, scientific, and medical (ISM) bands, i.e., 169 MHz, 434 MHz, and 868 MHz, are used. The main focus of the paper is to evaluate the path loss (PL), i.e., the power loss that a propagation radio wave would experience when communication occurs between a sail boat and a buoy. We describe the measurement results obtained performing three different radio power measurement campaigns, at the thr

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Torsvik, T., T. Soomere, I. Didenkulova, and A. Sheremet. "Identification of ship wake structures by a time–frequency method." Journal of Fluid Mechanics 765 (January 19, 2015): 229–51. http://dx.doi.org/10.1017/jfm.2014.734.

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AbstractThe wake of a ship that sails at relatively large Froude numbers usually contains a number of components of different nature and with different heights, lengths, timings and propagation directions. We explore the possibilities of the spectrogram representation of one-point measurements of the ship wake to identify these components and to quantify their main properties. This representation, based on the short-time Fourier transform, facilitates a reliable decomposition of the wake into constituent components and makes it possible to quantify their variations in the time–space domain and

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Yang, Jiachen, Tianlei Ni, Lin Liu, Jiabao Wen, Jingyi He, and Zhengjian Li. "The Sea Route Planning for Survey Vessel Intelligently Navigating to the Survey Lines." Sensors 22, no. 2 (2022): 482. http://dx.doi.org/10.3390/s22020482.

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Marine surveying is an important part of marine environment monitoring systems. In order to improve the accuracy of marine surveying and reduce investment in artificial stations, it is necessary to use high-precision GNSS for shipborne navigation measurements. The basic measurement is based on the survey lines that are already planned by surveyors. In response to the needs of survey vessels sailing to the survey line, a method framework for the shortest route planning is proposed. Then an intelligent navigation system for survey vessels is established, which can be applied to online navigation

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Frommer, Nicole, and Po Wen Cheng. "Sensitivity analysis of parameters impacting the performance of an energy ship using airborne wind energy." Journal of Physics: Conference Series 2767, no. 7 (2024): 072018. http://dx.doi.org/10.1088/1742-6596/2767/7/072018.

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Abstract This study assesses the impact of different model parameters on the power performance of energy ship systems using point-mass models, focusing on two operational modes. The first mode involves a kite operating in a pumping mode with adjustable tether lengths, aided by additional propellers for ship propulsion. It utilizes a quasi-steady kite model coupled with ship motion’s drag force and velocity triangles. The second mode features a kite pulling the ship, while underwater hydraulic turbines harness energy from ship velocity. Derived from a sail-based model, calculations deploy the f

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