Results 31 to 40 of about 46,285 (150)

Attitude stability and altitude control of a variable-geometry Earth-orbiting solar sail [PDF]

, 2016
A variable-geometry solar sail for on-orbit altitude control is investigated. It is shown that, by adjusting the effective area of the sail at favorable times, it is possible to influence the length of the semi-major axis over an extended period of time.
Ceriotti, Matteo, Felicetti, Leonard, Harkness, Patrick   +2 more
core   +1 more source

A high-resolution divergence and vorticity dataset in Beijing derived from radar wind profiler mesonet measurements [PDF]

Earth System Science Data
Low-level convergence and cyclonic circulation are one of the most important dynamic variables in governing the initiation and development of convective storms.
X. Guo, J. Guo, D. Meng, Y. Sun, Z. Zhang, Z. Zhang, H. Xu, L. Zeng, J. Chen, N. Li, T. Chen   +10 more
doaj   +1 more source

Characterization of a Double Mesospheric Bore Over Europe [PDF]

, 2017
Observations of a pair of mesospheric bore disturbances that propagated through the nighttime mesosphere over Europe are presented. The observations were made at the Padua Observatory, Asiago (45.9\ub0N, 11.5\ub0E), by the Boston University all-sky ...
Baumgardner, Jeffrey L., Chau, Jorge L., Gerding, Michael, Jacobi, Christoph, Lazzarin, Monica, Mendillo, Michael, Mlynczak, Martin G., Russell, James M., Smith, Steven M., Stober, Gunter, Umbriaco, Gabriel, Umbriaco, Gabriele   +11 more
core   +1 more source

Extending bioacoustic monitoring of birds aloft through flight call localization with a three‐dimensional microphone array

Ecology and Evolution, 2016
Bioacoustic localization of bird vocalizations provides unattended observations of the location of calling individuals in many field applications. While this technique has been successful in monitoring terrestrial distributions of calling birds, no ...
Phillip M. Stepanian, Kyle G. Horton, David C. Hille, Charlotte E. Wainwright, Phillip B. Chilson, Jeffrey F. Kelly   +5 more
doaj   +1 more source

Common Visual Representations as a Source for Misconceptions of Preservice Teachers in a Geometry Connection Course [PDF]

, 2019
In this paper, we demonstrate how atypical visual representations of a triangle, square or a parallelogram may hinder students’ understanding of a median and altitude.
Henry G. Gilbert Nursery and Seed Trade Catalog Collection., Lockard, John L., Old-Fashioned Gardens.   +2 more
core   +1 more source

A Pseudopolynomial Algorithm for Alexandrov's Theorem [PDF]

, 2008
Alexandrov's Theorem states that every metric with the global topology and local geometry required of a convex polyhedron is in fact the intrinsic metric of a unique convex polyhedron.
A.D. Alexandrov, E.D. Demaine, E.D. Demaine, I. Sabitov, I. Sabitov, J.S.B. Mitchell, M. Fedorchuk   +6 more
core   +3 more sources

The Skylab radar altimeter [PDF]

, 1972
A summary of the significant hardware characteristics of the S-193 altimeter experiment portion of the 1973 Skylab Mission is presented. A detailed discussion of the altimetry, oceanographic, and instrumentation technology objectives are presented along ...
Mcgoogan, J. T., Stanley, H. R.
core   +1 more source

Stokes tomography of radio pulsar magnetospheres. I. Linear polarization

, 2010
Polarimetric studies of pulsar radio emission traditionally concentrate on how the Stokes vector (I, Q, U, V) varies with pulse longitude, with special emphasis on the position angle (PA) swing of the linearly polarized component.
A. Melatos, Blaskiewicz, Brentjens, Burn, C. T. Y. Chung, Cheng, Cheng, Cordes, Deutsch, Dyks, Dyks, Gangadhara, Gil, Gil, Gould, Graham-Smith, Han, Haverkorn, Hibschman, Johnston, Johnston, Karastergiou, Karastergiou, Kaspi, Knight, Kramer, Lorimer, Lyne, Lyne, Manchester, Manchester, McKinnon, Melatos, Melrose, Navarro, Ord, Radhakrishnan, Rankin, Rankin, Rankin, Ruderman, Smith, Stairs, Słowikowska, von Hoensbroech, Watters, Weltevrede, Xilouris, Xu   +48 more
core   +1 more source

Flux of atmospheric muons: Comparison between AIRES simulations and CAPRICE98 data [PDF]

, 2003
We report on a comparison between the flux of muons in the atmosphere measured by the CAPRICE98 experiment and simulations performed with the air shower simulation program AIRES. To reduce systematic uncertainties we have used as input the primary fluxes
A.N. Cillis, A.N. Cillis, A.N. Cillis, B. Vulpescu, E. Mocchiutti, G. Battistoni, J. Knapp, J. Kremer, J. Wentz, L.A. Anchordoqui, M. Ambriola, M. Boezio, M. Boezio, M. Boezio, M. Boezio, M. Boezio, N.N. Kalmykov, N.N. Kalmykov, N.N. Kalmykov, P. Carlson, P. Hansen, S. J. Sciutto, X. Bertou   +22 more
core   +2 more sources

Altitude-dependent polarization in radio pulsars

, 2008
Because of the corotation, the polarization angle (PA) curve of a pulsar lags the intensity profile by 4r/Rlc rad in pulse phase. I present a simple and short derivation of this delay-radius relation to show that it is not caused by the aberration ...
Backer, Barnard, Blaskiewicz, Braje, Cheng, D'Angelo, Deutsch, Dyks, Dyks, Dyks, Dyks, Dyks, Dyks, Everett, Gil, Gonthier, Gupta, Hessels, Hibschman, J. Dyks, Johnston, Karastergiou, Kijak, Komesaroff, Kramer, Krishnamohan, Kunzl, Lai, Luo, Melrose, Radhakrishnan, Radhakrishnan, Ramachandran, Rankin, Rankin, Rankin, Shitov, Spitkovsky, Takata, Thomas, von Hoensbroech, Xilouris, Xu   +42 more
core   +2 more sources