Results 41 to 50 of about 45,387 (211)

Third derivatives of the integrable part of an asteroid Hamiltonian [PDF]

Serbian Astronomical Journal, 2007
To apply the theorem of Nekhoroshev (1977) to asteroids, one first has to check whether a necessary geometrical condition is fulfilled: either convexity, or quasi-convexity, or only a 3-jet non-degeneracy.
Pavlović R.
doaj   +1 more source

Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review

SmartBot, EarlyView.
Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen, Yixin Zhu, Mingxia Bao, Ting Zhang, Jun Wu, Jingbin Hao, Dezheng Hua, Xinhua Liu   +7 more
wiley   +1 more source

Invariant manifolds, discrete mechanics, and trajectory design for a mission to Titan [PDF]

, 2009
With an environment comparable to that of primordial Earth, a surface strewn with liquid hydrocarbon lakes, and an atmosphere denser than that of any other moon in the solar system, Saturn's largest moon Titan is a treasure trove of potential scientific ...
Campagnola, Stefano, Gawlik, Evan S., Marsden, Jerrold E., Moore, Ashley   +3 more
core  

Serendipitous ritualization: dynamics of lay connectivity in Chinese Buddhist temples and beyond Ritualisation fortuite : dynamique de la connectivité des laïques dans les temples bouddhistes chinois et au‐delà

Journal of the Royal Anthropological Institute, EarlyView.
This article contributes to rethinking the dichotomy between informal sociality and ritual formality by examining the occasional ritual encounters surrounding spirit‐tablet inscription in Chinese Buddhist temples. Rather than viewing rituals as enactments of established orders, it presents ritual engagement as a contingent process of relational ...
Yang Shen
wiley   +1 more source

Celestial Mechanics, Conformal Structures, and Gravitational Waves

, 2005
The equations of motion for $N$ non-relativistic particles attracting according to Newton's law are shown to correspond to the equations for null geodesics in a $(3N+2)$-dimensional Lorentzian, Ricci-flat, spacetime with a covariantly constant null ...
A. A. Koppel, A. P. Balachandran, B. DeWitt, C. Brans, C. Duval, C. Duval, C. Duval, C. R. Hagen, Christian Duval, D. Lynden-Bell, E. Cartan, E. Cartan, E. Prugovečki, F. Cedó, G. Burdet, G. Burdet, G. Burdet, G. T. Horowitz, G. T. Horowitz, G. W. Gibbons, G. W. Gibbons, G. W. Gibbons, G. W. Gibbons, Gary Gibbons, H. Bateman, H. P. Künzle, H. P. Künzle, H. P. Künzle, J. M. Lévy-Leblond, J. M. Lévy-Leblond, J. M. Lévy-Leblond, J. M. Souriau, J. Mestshersky, J. P. Vinti, J. S. Dowker, J. Śniatycki, L. Fehér, M. B. Green, M. Crampin, M. Le Bellac, M. Perrin, M. W. Brinkmann, M. W. Brinkmann, P. A. M. Dirac, P. Forgács, P. Horváthy, P. J. Peebles, P. Jordan, P. Jordan, P. Jordan, Péter Horváthy, R. Jackiw, R. Jackiw, S. Benenti, S. Benenti, T. Damour, T. Damour, U. Niederer, V. De Alfaro, V. Hussin, V. Hussin, W. M. Tulczyjew   +61 more
core   +1 more source

Flap Anatomies and Victorian Veils: Penetrating the Female Reproductive Interior

Gender &History, EarlyView.
ABSTRACT This article examines the reappearance in the early nineteenth century of anatomical flapbooks in the context of obstetrical education in Britain, America and France. It asks why liftable paper flaps were reintroduced at this time after their disappearance from medical atlases in the eighteenth century.
Margaret Carlyle, Marcia D. Nichols
wiley   +1 more source

Computation of asteroid proper elements: Recent advances [PDF]

Serbian Astronomical Journal, 2017
The recent advances in computation of asteroid proper elements are briefly reviewed. Although not representing real breakthroughs in computation and stability assessment of proper elements, these advances can still be considered as important improvements
Knežević Z.
doaj   +1 more source

Interaction between celestial and terrestrial reference frames and some considerations for the next VLBI-based ICRF [PDF]

, 2014
In this paper we outline several problems related to the realization of the international celestial and terrestrial reference frames ICRF and ITRF at the millimeter level of accuracy, with emphasis on ICRF issues. The main topics considered are: analysis
Lambert, Sebastien, Ma, Chopo, Malkin, Zinovy, Schuh, Harald   +3 more
core  

Good rotations

, 1998
Numerical integrations in celestial mechanics often involve the repeated computation of a rotation with a constant angle. A direct evaluation of these rotations yields a linear drift of the distance to the origin.
Danby, Dickson, Hardy, J-M. Petit, Knuth, M. Hénon, Paeth, Petit, Quinn, Rose, Shiu, Yoshida   +11 more
core   +3 more sources

Gevrey estimates for one dimensional parabolic invariant manifolds of non-hyperbolic fixed points [PDF]

, 2017
We study the Gevrey character of a natural parameterization of one dimensional invariant manifolds associated to a parabolic direction of fixed points of analytic maps, that is, a direction associated with an eigenvalue equal to $1$.
Baldomá, Inmaculada, Fontich, Ernest, Martín, Pau   +2 more
core   +3 more sources