Results 31 to 40 of about 305,009 (232)

Exoplanets imaging with a Phase-Induced Amplitude Apodization Coronagraph - I. Principle

, 2004
Using 2 aspheric mirrors, it is possible to apodize a telescope beam without losing light or angular resolution: the output beam is produced by ``remapping'' the entrance beam to produce the desired light intensity distribution in a new pupil. We present
Eugene A. Pluzhnik, Frantz Martinache, Jacquinot P., Olivier Guyon, Raphael Galicher, Robert A. Woodruff, Stephen T. Ridgway   +6 more
core   +1 more source

Free massive particles with total energy E < mc^2 in curved spacetimes [PDF]

, 2002
We analyze free elementary particles with rest mass $m$ and total energy $E < m c^2$ in the Rindler wedge, outside Reissner-Nordstrom black holes and in the spacetime of relativistic (and non-relativistic) stars, and use Unruh-DeWitt-like detectors to ...
Castineiras, Jorge, Crispino, Luis C. B., Matsas, George E. A., Vanzella, Daniel A. T.   +3 more
core   +2 more sources

Study and Design of a Linear Compressor of Voice-Coil Typ

Advances in Electrical and Computer Engineering, 2009
The paper presents the design and Finite Element (FEM) analysis of a Linear compressor of voice coil type (LCVCT). This kind of linear compressor will be used in a refrigerator equipment.
VADAN, I., BALAN, H., MUNTEANU, R.
doaj   +1 more source

Tidal instability in a rotating and differentially heated ellipsoidal shell

, 2010
The stability of a rotating flow in a triaxial ellipsoidal shell with an imposed temperature difference between inner and outer boundaries is studied numerically.
Aldridge, Aurnou, Christensen, Cébron, D. Cébron, Fabijonas, Goodman, Herreman, Hindmarsh, Kerswell, Kerswell, Kerswell, King, Kumazawa, Lacaze, Lacaze, Le Bars, Le Bars, Le Bars, Le Dizès, Leweke, Lister, Lubow, M. Le Bars, Malkus, Meunier, Moore, P. Maubert, Rieutord, Ryu, Stanley, Sumita, Tilgner, Widnall, Williams   +34 more
core   +4 more sources

A systematic numerical study of the tidal instability in a rotating triaxial ellipsoid [PDF]

, 2010
The full non-linear evolution of the tidal instability is studied numerically in an ellipsoidal fluid domain relevant for planetary cores applications.
Aldridge, Bayly, Benton, Boubnov, Chan, Craik, D. Cébron, Eloy, Eloy, Gledzer, Gledzer, Gledzer, Greenspan, Haj-Hariri, Herreman, Hollerbach, Hough, J. Leontini, Kelvin, Kerswell, Kerswell, Kerswell, Lacaze, Lacaze, Lacaze, Lacaze, Lainey, Le Bars, Le Bars, Le Dizès, Le Dizès, Leblanc, Leblanc, Leweke, Leweke, Lundgren, M. Le Bars, Malkus, Mason, McAlister, Meunier, Moore, Munk, P. Le Gal, P. Maubert, Pierrehumbert, Poincaré, Potylitsin, Rieutord, Roy, Seyed-Mahmoud, Seyed-Mahmoud, Shangli, Sipp, Sipp, Thess, Touma, Vladimirov, Waleffe, Widnall, Williams   +60 more
core   +6 more sources

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

Unified pseudo-static seismic reduction factors for shallow foundations via an earth-pressure framework

Soils and Foundations
This paper presents a unified and physically consistent method for evaluating the seismic bearing capacity of shallow foundations, based on classical earth pressure theory and a reinterpretation of the failure mechanism beneath the footing.
Lysandros Pantelidis
doaj   +1 more source

The birth of spacetime atoms as the passage of time

, 2014
The view that the passage of time is physical finds expression in the classical sequential growth models of Rideout and Sorkin in which a discrete spacetime grows by the partially ordered accretion of new spacetime atoms.Comment: Article based on an ...
Dowker, Fay
core   +1 more source

Constraints to a Yukawa gravitational potential from laser data to LAGEOS satellites [PDF]

, 2002
In this paper we investigate the possibility of constraining the hypothesis of a fifth force at the length scale of two Earth's radii by investigating the effects of a Yukawa gravitational potential on the orbits of the laser--ranged LAGEOS satellites ...
Ciufolini, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Iorio, Iorio, Iorio, Iorio, Krause, Lorenzo Iorio, Lucchesi, Milani, Nordvedt, Ohanian   +14 more
core   +2 more sources

In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS

FEBS Letters, EarlyView.
We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka, Yuxi Liu, Stefano Maggi, Debnath Ghosal, Jue Wang, Prashant P. Damke, Stephen D. Carter, Wei Zhao, Sukhithasri Vijayrajratnam, Joseph P. Vogel, Carrie L. Shaffer, Grant J. Jensen   +11 more
wiley   +1 more source