Zobrazeno 1 - 10
of 673
pro vyhledávání: '"Frazin A"'
Autor:
Frazin, Richard A.
Existing Electric Field Conjugation (EFC) methods are not suited for treating small polarization effects, referred to here as cross polarization. EFC utilizes a deformable mirror (DM) to nullify the electric fields from the host star within a \emph{d
Externí odkaz:
http://arxiv.org/abs/2410.03579
Publikováno v:
Energy Reports, Vol 6, Iss , Pp 173-178 (2020)
In this paper, we present an inductor-less direct ac–ac converter with improved nesting-type topology. Unlike existing direct ac–ac converters, the proposed ac–ac converter combines a voltage equalizer and a switched-capacitor (SC) simple conve
Externí odkaz:
https://doaj.org/article/da15ee413da74246a54ff1b9e959adf5
Publikováno v:
Energy Reports, Vol 6, Iss , Pp 257-262 (2020)
Recently, an inductor-less inverter attracts many researchers’ attention, because the inductor-less design can provide not only small size but also small electromagnetic interference (EMI). In this paper, we propose a novel step-down switched-capac
Externí odkaz:
https://doaj.org/article/2a013b864ae34fc1b30e2d2e57c410b7
Publikováno v:
Energy Reports, Vol 6, Iss , Pp 228-234 (2020)
This paper presents a novel dual-input cross-connected charge pump utilizing scavenged energy. The proposed converter has two input sources: a battery input and a scavenged energy input. Unlike existing charge pumps, the proposed converter alleviates
Externí odkaz:
https://doaj.org/article/1f2730f5d8d24719b8d8935200d537bb
Autor:
Guyon, Olivier, Norris, Barnaby, Martinod, Marc-Antoine, Ahn, Kyohoon, Tuthill, Peter, Males, Jared, Wong, Alison, Skaf, Nour, Currie, Thayne, Miller, Kelsey, Bos, Steven P., Lozi, Julien, Deo, Vincent, Vievard, Sebastien, Belikov, Ruslan, van Gorkom, Kyle, Mazin, Benjamin, Bottom, Michael, Frazin, Richard, Rodack, Alexander, Groff, Tyler, Jovanovic, Nemanja, Martinache, Frantz
High contrast imaging (HCI) systems rely on active wavefront control (WFC) to deliver deep raw contrast in the focal plane, and on calibration techniques to further enhance contrast by identifying planet light within the residual speckle halo. Both f
Externí odkaz:
http://arxiv.org/abs/2109.13958
Autor:
Ahn, Kyohoon, Guyon, Olivier, Lozi, Julien, Vievard, Sébastien, Deo, Vincent, Skaf, Nour, Belikov, Ruslan, Bos, Steven P., Bottom, Michael, Currie, Thayne, Frazin, Richard, Gorkom, Kyle V., Groff, Tyler D., Haffert, Sebastiaan Y., Jovanovic, Nemanja, Kawahara, Hajime, Kotani, Takayuki, Males, Jared R., Martinache, Frantz, Mazin, Benjamin A., Miller, Kelsey, Norris, Barnaby, Rodack, Alexander, Wong, Alison
To directly detect exoplanets and protoplanetary disks, the development of high accuracy wavefront sensing and control (WFS&C) technologies is essential, especially for ground-based Extremely Large Telescopes (ELTs). The Subaru Coronagraphic Extreme
Externí odkaz:
http://arxiv.org/abs/2109.13353
Autor:
Frazin, Richard A, Rodack, Alexander T
The leading difficulty in achieving the contrast necessary to directly image exoplanets and associated structures (eg. protoplanetary disks) at wavelengths ranging from the visible to the infrared are quasi-static speckles, and they are hard to disti
Externí odkaz:
http://arxiv.org/abs/2105.06590
One of the top remaining science challenges in astronomical optics is the direct imaging and characterization of extrasolar planets and planetary systems. Directly imaging exoplanets from ground-based observatories requires combining high-order adapt
Externí odkaz:
http://arxiv.org/abs/2105.06589
Autor:
Currie, Thayne, Pluzhnik, Eugene, Guyon, Olivier, Belikov, Ruslan, Miller, Kelsey, Bos, Steven, Males, Jared, Sirbu, Dan, Bond, Charlotte, Frazin, Richard, Groff, Tyler, Kern, Brian, Lozi, Julien, Mazin, Benjamin, Nemati, Bijan, Norris, Barnaby, Subedi, Hari, Will, Scott
Imaging planets in reflected light, a key focus of future NASA missions and ELTs, requires advanced wavefront control to maintain a deep, temporally correlated null of stellar halo -- i.e. a dark hole -- at just several diffraction beam widths. Using
Externí odkaz:
http://arxiv.org/abs/2007.14413
Autor:
Lloveras, D. G., Vásquez, A. M., Nuevo, F. A., Mac Cormack, C., Sachdeva, N., Manchester IV, W., Van der Holst, B., Frazin, R. A.
We carry out a study of the global three-dimensional (3D) structure of the electron density and temperature of the quiescent inner solar corona ($r<1.25 R_\odot$) by means of tomographic reconstructions and magnetohydrodynamic simulations. We use dif
Externí odkaz:
http://arxiv.org/abs/2004.06815