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Your search keyword '"Wagner, R.J."' showing total 66 results
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66 results on '"Wagner, R.J."'

1. The unique geomorphology and structural geology of the Haulani crater of dwarf planet Ceres as revealed by geological mapping of equatorial quadrangle Ac-6 Haulani

Author

Krohn, K., Jaumann, R., Otto, K.A., Schulzeck, F., Neesemann, A., Nass, A., Stephan, K., Tosi, F., Wagner, R.J., Zambon, F., von der Gathen, I., Williams, D.A., Buczkowski, D.L., De Sanctis, M.C., Kersten, E., Matz, K.-D., Mest, S.C., Pieters, C.M., Preusker, F., Roatsch, T., Scully, J.E.C., Russell, C.T., and Raymond, C.A.

Published
2018
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2. Science goals and mission concept for the future exploration of Titan and Enceladus

Author

Tobie, G., Teanby, N.A., Coustenis, A., Jaumann, R., Raulin, F., Schmidt, J., Carrasco, N., Coates, A.J., Cordier, D., De Kok, R., Geppert, W.D., Lebreton, J.-P., Lefevre, A., Livengood, T.A., Mandt, K.E., Mitri, G., Nimmo, F., Nixon, C.A., Norman, L., Pappalardo, R.T., Postberg, F., Rodriguez, S., Schulze-Makuch, D., Soderblom, J.M., Solomonidou, A., Stephan, K., Stofan, E.R., Turtle, E.P., Wagner, R.J., West, R.A., and Westlake, J.H.

Published
2014
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5. From the ground up: special forces tactical facilities

Author

Wagner, R.J. and Snortland, Brad

Subjects
Integrated logistic support -- Military aspects, History, Military and naval science
Abstract

Since the initial stages of the war on terror, Special Forces has established and developed more than 75 tactical facilities, or TACFACs, in Afghanistan and Iraq. The TACFACs were established [...]

Published
2009

7. Dislocation nucleation during nanoindentation of aluminum

Author

Wagner, R.J., Ma, L., Tavazza, F., and Levine, L.E.

Subjects
Aluminum -- Electric properties, Aluminum -- Structure, Aluminum -- Thermal properties, Elasticity -- Evaluation, Finite element method -- Usage, Nucleation -- Analysis, Physics
Abstract

Multiscale simulations are performed to examine the nucleation of dislocations in a single-crystal Al sample and analyze the role of unavoidable indenter roughness. The studies have shown the underlying dislocation nucleation mechanism for atomically rough indenters is dependent on temperature, with surface nucleation favored at lower temperatures.

Published
2008

8. Preliminary Geological Map of the Ac-H-11 Sintana Quadrangle of Ceres: An Integrated Mapping Study Using Dawn Spacecraft Data

Author

Schulzeck, F., Jaumann, R., Krohn, Katrin, Williams, D.A., Buczkowski, D.L., Mest, S., Scully, J.E.C., von der Gathen, Isabel, Kersten, Elke, Matz, K.-D., Nass, A., Otto, K., Pieters, C.M., Preusker, Frank, Roatsch, T., De Sanctis, M.C., Schröder, S.E., Stephan, K., Wagner, R.J., Raymond, C.A., and Russell, C.T.

Subjects
Mapping, Sintana, Ceres, Dawn
Published
2015

9. Science goals and mission concept for the future exploration of Titan and Enceladus

Author

Tobie, G. Teanby, N.A. Coustenis, A. Jaumann, R. Raulin, F. Schmidt, J. Carrasco, N. Coates, A.J. Cordier, D. De Kok, R. Geppert, W.D. Lebreton, J.-P. Lefevre, A. Livengood, T.A. Mandt, K.E. Mitri, G. Nimmo, F. Nixon, C.A. Norman, L. Pappalardo, R.T. Postberg, F. Rodriguez, S. Schulze-Makuch, D. Soderblom, J.M. Solomonidou, A. Stephan, K. Stofan, E.R. Turtle, E.P. Wagner, R.J. West, R.A. Westlake, J.H.

Abstract

Saturn's moons, Titan and Enceladus, are two of the Solar System's most enigmatic bodies and are prime targets for future space exploration. Titan provides an analogue for many processes relevant to the Earth, more generally to outer Solar System bodies, and a growing host of newly discovered icy exoplanets. Processes represented include atmospheric dynamics, complex organic chemistry, meteorological cycles (with methane as a working fluid), astrobiology, surface liquids and lakes, geology, fluvial and aeolian erosion, and interactions with an external plasma environment. In addition, exploring Enceladus over multiple targeted flybys will give us a unique opportunity to further study the most active icy moon in our Solar System as revealed by Cassini and to analyse in situ its active plume with highly capable instrumentation addressing its complex chemistry and dynamics. Enceladus' plume likely represents the most accessible samples from an extra-terrestrial liquid water environment in the Solar system, which has far reaching implications for many areas of planetary and biological science. Titan with its massive atmosphere and Enceladus with its active plume are prime planetary objects in the Outer Solar System to perform in situ investigations. In the present paper, we describe the science goals and key measurements to be performed by a future exploration mission involving a Saturn-Titan orbiter and a Titan balloon, which was proposed to ESA in response to the call for definition of the science themes of the next Large-class mission in 2013. The mission scenario is built around three complementary science goals: (A) Titan as an Earth-like system; (B) Enceladus as an active cryovolcanic moon; and (C) Chemistry of Titan and Enceladus - clues for the origin of life. The proposed measurements would provide a step change in our understanding of planetary processes and evolution, with many orders of magnitude improvement in temporal, spatial, and chemical resolution over that which is possible with Cassini-Huygens. This mission concept builds upon the successes of Cassini-Huygens and takes advantage of previous mission heritage in both remote sensing and in situ measurement technologies. © 2014 Elsevier Ltd.

Published
2014

10. First imaging results from the Iapetus B/C flyby of the Cassini spacecraft

Author

Denk, T., Neukum, G., Roatsch, T., McEwen, A.S., Turtle, E.P., Thomas, P.C., Helfenstein, P., Wagner, R.J., Porco, C.C., Perry, J.E., Giese, B., Johnson, T.V., and Veverka, J.

Subjects
ISS, Institut für Planetenforschung, Iapetus, Cassini, Saturnian satellites
Abstract

Cassini had a relatively close flyby at Iapetus on New Year's Eve 2005. The 288 ISS images set various constraints on the origin theories of the dark/bright dichotomy, as revealed multiple surface structures at up to 740 m/pxl size.

Published
2005

11. The first six month of Iapetus observations by the Cassini ISS camera

Author

Denk, T., Neukum, G., Helfenstein, P., Thomas, P.C., Turtle, E.P., McEwen, A.S., Roatsch, T., Veverka, J., Johnson, T.V., Perry, J.E., Owen, W., Wagner, R.J., and Porco, C.C.

Subjects
ISS, Institut für Planetenforschung, Iapetus, Cassini, Saturnian satellites
Abstract

Since arrival at Saturn, Iapetus has been studied intensively by the Cassini ISS camera. The results of the first half year of observations until before the New Year's Eve flyby are described.

Published
2005

12. Martian ages from HRSC images

Author

Neukum, G., Werner, S., Van Gasselt, S., Hauber, E., Kronberg, P., Ivanov, B.A., Wagner, R.J., Hoffmann, H., Masson, Ph., Head, J.W., CRINON, Evelyne, Interactions et dynamique des environnements de surface (IDES), and Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU] Sciences of the Universe [physics]/Earth Sciences, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Published
2004

20. Dependence of InAs phonon energy on misfit-induced strain.

Author

Yang, M.J. and Wagner, R.J.

Subjects
*PHONONS, *INDIUM compounds, *QUANTUM wells
Abstract

Examines the transverse-optical (TO) phonon energy in strained indium arsenide quantum wells. Demonstration of far-infrared absorption by TO phonons; Correlation between TO phonon energy and misfit-induced biaxial tension; Determination of the phonon deformation parameters.

Published
1993
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21. Accurate determination of effective quantum well thickness: Infrared absorption by....

Author

Yang, M.J. and Wagner, R.J.

Subjects
*QUANTUM wells, *SPECTRUM analysis, *PHONON scattering
Abstract

Examines the infrared transmission spectra of aluminum antimonide (AlSb)/indium Sb/AlSb single quantum well thickness. Growth of the samples on gallium arsenide substrates; Independence of interbranch phonon scattering from well thickness; Effect of phonon lifetime on quantum well thickness.

Published
1992
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22. In situ determination of flux nonuniformities during molecular beam epitaxial growth.

Author

Shanabrook, B.V., Katzer, D.S., and Wagner, R.J.

Subjects
AMPLITUDE modulation, OSCILLATIONS, REFLECTION high energy electron diffraction
Abstract

Observes an amplitude modulation superimposed on growth induced reflection high energy electron diffraction oscillations in molecular beam epitaxial growth of GaAs, AlSb and GaSb. Relation of the modulation to nonuniform group III fluxes at the substrate; Usefulness of the phenomenon.

Published
1991
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