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840 results on '"Wang, H.-S"'

305. Large Interferometer For Exoplanets (LIFE): I. Improved exoplanet detection yield estimates for a large mid-infrared space-interferometer mission

Author

Quanz, Sascha P., Ottiger, Marcel, Fontanet, E., Kammerer, Jens, Menti, Franziska, Dannert, Felix, Gheorghe, A., Absil, O., Airapetian, Vladimir S., Alei, Eleonora, Allart, Romain, Angerhausen, Daniel, Blumenthal, S., Buchhave, Lars, Cabrera, J., Carrión-González, Óscar, Chauvin, Gaël, Danchi, William C., Dandumont, Colin, Defrère, Denis, Dorn, Caroline, Ehrenreich, David, Ertel, Steve, Fridlund, Malcolm C.V., García Muñoz, Antonio, Gascón, C., Girard, Julien H., Glauser, Adrian, Grenfell, John Lee, Guidi, Greta, Hagelberg, Janis, Helled, Ravit, Ireland, M. J., Kopparapu, Ravi K., Korth, Judith, Kozakis, Thea, Kraus, Stefan, Léger, Alain, Leedjärv, Laurits, Lichtenberg, Tim, Lillo-Box, Jorge, Linz, Hendrik, Liseau, René, Loicq, Jérôme, Mahendra, Vishal, Malbet, Fabien, Mathew, J., Mennesson, Bertrand, Meyer, Michael R., Mishra, Lokesh, Molaverdikhani, K., Noack, Lena, Pallé, Enric, Parviainen, Hannu, Quirrenbach, Andreas, Rauer, Heike, Ribas, Ignasi, Rice, M., Romagnolo, A., Rugheimer, Sarah, Schwieterman, Edward W., Serabyn, Eugene, Sharma, S., Stassun, Keivan G., Szulágyi, Judit, Wang, H. S., Wunderlich, Fabian, and Wyatt, Mark C.

Subjects
Techniques: high angular resolution, Infrared: planetary systems, Planets and satellites: terrestrial planets, Methods: numerical, Techniques: interferometric, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Planets and satellites: detection, 7. Clean energy, Telescopes
Abstract

One of the long-term goals of exoplanet science is the atmospheric characterization of dozens of small exoplanets in order to understand their diversity and search for habitable worlds and potential biosignatures. Achieving this goal requires a space mission of sufficient scale. We seek to quantify the exoplanet detection performance of a space-based mid-infrared nulling interferometer that measures the thermal emission of exoplanets. For this, we have developed an instrument simulator that considers all major astrophysical noise sources and coupled it with Monte Carlo simulations of a synthetic exoplanet population around main-sequence stars within 20 pc. This allows us to quantify the number (and types) of exoplanets that our mission concept could detect over a certain time period. Two different scenarios to distribute the observing time among the stellar targets are discussed and different apertures sizes and wavelength ranges are considered. Within a 2.5-year initial search phase, an interferometer consisting of four 2 m apertures covering a wavelength range between 4 and 18.5 μm could detect up to ~550 exoplanets with radii between 0.5 and 6 R⊕ with an integrated SNR≥7. At least ~160 of the detected exoplanets have radii ≤1.5 R⊕. Depending on the observing scenario, ~25-45 rocky exoplanets (objects with radii between 0.5 and 1.5 ⊕) orbiting within the empirical habitable zone (eHZ) of their host stars are among the detections. With four times 3.5 m aperture size, the total number of detections can increase to up to ~770, including ~60-80 rocky, eHZ planets. With four times 1 m aperture size, the maximum detection yield is ~315 exoplanets, including ≤20 rocky, eHZ planets. In terms of predicted detection yield, such a mission can compete with large single-aperture reflected light missions., arXiv

348. Study of vehicle-terrain interaction based on ANCF

Author

Li, G B and Wang, H S

Abstract

A brief review of the empirical and analytical models are presented. The pressure-sinkage relationship proposed by Bekker and the tractive performance (drawbar pull-slip) of vehicle is set up. A figure of drawbar pull vs. slip at different time and slip is illustrated. The modified Bekker soil models are integrated finite element (FE) Absolute Nodal Coordinate Formulation (ANCF) interpolations to determine the generalized forces. The paper discusses important fundamental issues that must be addressed when implementing terramechanics models into MBS algorithms in order to model complex tracked vehicle-soil interactions.

Published
2017

349. Domain wall resistance in ultrathin manganite films.

Author

Li, Qi, Hu, Y. F., and Wang, H. S.

Subjects
*FERROMAGNETIC materials, *MAGNETIC domain, *MANGANITE, *MAGNETIC properties of metallic films, *MAGNETIC properties
Abstract

Resistance related to magnetic domain walls in compressive-strained epitaxial manganite ultrathin films has been studied. The samples were demagnetized in different ways to induce either multidomain or single domain states. Very large difference in resistance was observed between the two states, which was attributed to the domain wall resistance. The magnitude of the domain wall resistance was found to be different in different manganite compounds. We have shown that large domain wall resistance can be obtained in strained ultrathin manganite films and the result cannot be simply explained by the existing models. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001
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