Results 71 to 80 of about 76,745 (212)

Must Longtermists Wish Us All Dead? A Quadrilemma

Journal of Applied Philosophy, EarlyView.
ABSTRACT Longtermists assign great moral importance to making the long‐term future as good as possible, especially by ensuring the survival of humanity. We argue, to the contrary, that on assumptions that are plausible, conservative, or shared by leading longtermists, human extinction will likely augment total utility among human and non‐human animals ...
Nir Eyal, Bastian Steuwer, Shai Meiri
wiley   +1 more source

A BRIEF VISIT FROM THE FIRST INTERSTELLAR ASTEROID REVEALS A RED EXTREMELY ELONGATED BODY

Nature, 2017
None of the approximately 750,000 known asteroids and comets in the Solar System is thought to have originated outside it, despite models of the formation of planetary systems suggesting that orbital migration of giant planets ejects a large fraction of ...
K. Meech, R. Weryk, Marco Micheli, J. Kleyna, O. Hainaut, R. Jedicke, R. Wainscoat, K. Chambers, J. Keane, A. Petric, L. Denneau, E. Magnier, T. Berger, M. Huber, H. Flewelling, C. Waters, Eva Schunová-Lilly, S. Chastel   +17 more
semanticscholar   +1 more source

Magnetic field measurements during the ROSETTA flyby at asteroid (21) Lutetia [PDF]

, 2011
On July 10, 2010, the ROSETTA spacecraft performed a flyby at asteroid (21) Lutetia at a solar distance of 2.72 AU. The spacecraftâ  asteroid distance at closest approach was 3120 km.
Glassmeier, K.H., J. Müller, Auster, H., Richter, I., Glassmeier, K., Auster, H. U., Mueller, J., Motschmann, U., H.U. Auster, McKenna-Lawlor, S., C.M. Carr, S. McKenna-Lawlor, Carr, C., Carr, C.M., U. Motschmann, I. Richter, C. Koenders, Koenders, C., Müller, J., K.H. Glassmeier   +19 more
core   +1 more source

On Graphs Which Have Locally Complete 2‐Edge‐colourings and Their Relationship to Proper Circular‐Arc Graphs

Journal of Graph Theory, EarlyView.
ABSTRACT A 2‐edge‐coloured graph G $G$ is called locally complete if for each vertex v $v$, the vertices adjacent to v $v$ through edges of the same colour induce a complete subgraph in G $G$. Locally complete 2‐edge‐coloured graphs have nice properties, and there exists a polynomial algorithm to decide whether such a graph has an alternating ...
Jørgen Bang‐Jensen, Jing Huang
wiley   +1 more source

Оптимальное управление движением космического аппарата в поле притяжения астероида Эрос 433

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2019
Рассматривается алгоритм оптимизации управляемого движения космического аппарата с двигателями малой тяги в поле притяжения астероида Эрос 433. Гравитационное поле астероида имеет сложную конфигурацию.
А. Ю. Шорников
doaj   +1 more source

Real-time optimal control for irregular asteroid landings using deep neural networks [PDF]

Acta Astronautica, 2019
To improve the autonomy and intelligence of asteroid landing control, a real-time optimal control approach is proposed using deep neural networks (DNN) to achieve precise and robust soft landings on asteroids with irregular gravitational fields.
Lin Cheng, Zhenbo Wang, Yu Song, Fang-Hua Jiang   +3 more
semanticscholar   +1 more source

Method‐dependent differences in zooplankton abundance and size metrics: Microscopy vs. ZooScan

Limnology and Oceanography: Methods, EarlyView.
Abstract Image‐based approaches such as ZooScan are increasingly used for high‐throughput zooplankton monitoring. However, quantitative evaluations of methodological differences relative to conventional microscopy remain limited. In this study, zooplankton abundance and size‐based metrics obtained from microscopy and ZooScan image analysis were ...
Young Seok Jeong, Min‐Chul Jang, Min Ho Seo, Dong‐Hun Lee, Ho Young Soh   +4 more
wiley   +1 more source

A Post‐Launch Summary of the Science of NASA's Psyche Mission

AGU Advances
Astronomical observations indicate that asteroid (16) Psyche is a large, high‐density (likely >3,400 kg·m−3), metal‐rich (30–55 vol. %) asteroid. Psyche may be remnant core material or it could be a primordial, undifferentiated metal‐rich object.
Steven D. Dibb, Erik Asphaug, James F. Bell, Richard P. Binzel, William F. Bottke, Saverio Cambioni, John M. Christoph, Linda T. Elkins‐Tanton, Ralf Jaumann, David J. Lawrence, Rona Oran, Joseph G. O’Rourke, Carol Polansky, Benjamin P. Weiss, Mark Wieczorek, David. A. Williams   +15 more
doaj   +1 more source

Asteroid pairs: A complex picture [PDF]

Icarus (New York, N.Y. 1962), 2019
We studied a sample of 93 asteroid pairs, i.e., pairs of genetically related asteroids that are on highly similar heliocentric orbits. We estimated times elapsed since separation of pair members (i.e., pair age) that are between 7 × 103 yr and a few 106 ...
P. Pravec, P. Fatka, D. Vokrouhlický, P. Scheirich, J. Ďurech, D. Scheeres, P. Kušnirák, K. Hornoch, A. Galád, D. P. Pray, Y. Krugly, O. Burkhonov, S. Ehgamberdiev, J. Pollock, N. Moskovitz, A. Thirouin, J. Ortiz, N. Morales, M. Husárik, R. Inasaridze, J. Oey, D. Polishook, J. Hanuš, H. Kučáková, J. Vraštil, J. Világi, Š. Gajdoš, L. Kornoš, P. Vereš, N. Gaftonyuk, T. Hromakina, A. Sergeyev, I. Slyusarev, V. Ayvazian, W. Cooney, J. Gross, D. Terrell, F. Colás, F. Vachier, S. Slivan, B. Skiff, F. Marchis, K. Érgashev, D.-H. Kim, A. Aznar, M. Serra-Ricart, R. Behrend, R. Roy, F. Manzini, I. Molotov   +49 more
semanticscholar   +1 more source

The Stripping Method for X‐Ray Spectral Correction in ISO 4037‐1 Narrow Spectra Series (N10‐N150)

X-Ray Spectrometry, EarlyView.
ABSTRACT Spectrometry is an important tool for the characterization of X‐ray beams in ionizing radiation metrology. However, the use of solid‐state spectrometers for accurate measurements requires correction of spectral distortions caused by the interaction between photons and the detector.
Matheus Rebello do Nascimento, Josilene Cerqueria Santos, Eric Matos Macedo, Leonardo de Castro Pacífico, Luís Alexandre Gonçalves Magalhães   +4 more
wiley   +1 more source