Results 81 to 90 of about 9,233 (214)

Numerical Modeling of Purely Active (Plume‐Produced) Continental Rifting and Break‐Up

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract In contrast to the traditional mechanism of passive continental rifting (driven by far‐field tectonic forces), the active rifting‐to‐break‐up processes (caused by rising mantle plumes) are still poorly understood. However, most episodes of fragmentation of the last supercontinent Pangea were relatively shortly preceded (within ∼10 Myr) by the ...
Alexander Koptev, Alessio Lavecchia, Sierd Cloetingh, Michaël Pons, Enrico Marzotto, Sascha Brune, István Kovács, Magdala Tesauro, Fred Beekman, Qin Wang, Stephan V. Sobolev, Claudio Faccenna, Laurent Jolivet   +12 more
wiley   +1 more source

Improved bounds on the peak sidelobe level of binary sequences

, 2015
Schmidt proved in 2014 that if $\varepsilon>0$, almost all binary sequences of length $n$ have peak sidelobe level between $(\sqrt{2}-\varepsilon)\sqrt{n\log n}$ and $(\sqrt{2}+\varepsilon)\sqrt{n\log n}$. Because of the small gap between his upper and lower bounds, it is difficult to find improved upper bounds that hold for almost all binary ...
openaire   +2 more sources

Sub‐THz Multifunctional Metasurfaces for Independent Transmission or Reflection Phase Manipulation

Advanced Optical Materials, Volume 14, Issue 4, 27 January 2026.
This article presents a rigorous analysis, design, and characterization of a novel sub‐THz metalens and reflective metasurface. Unlike bulky optical systems, the proposed thin, planar metasurface enables dual‐band full‐space wavefront control, via low‐loss transmission and reflection phase tuning, offering compact integration and improved ...
Bilal Ouardi, Orestis Koutsos, Olivier de Sagazan, Malo Robin, Ronan Sauleau, Antonio Clemente   +5 more
wiley   +1 more source

Near‐Field Acoustic Imaging Using Fiber‐Optic Distributed Acoustic Sensing and Beamforming Techniques

Advanced Science, Volume 13, Issue 6, 30 January 2026.
This work introduces a beamforming‐based method to generate acoustic images from fiber‐optic distributed acoustic sensing (DAS) data. By performing 2D scanning around the sensing fiber, the approach enables near‐field imaging and localization of acoustic sources, even in regions distant from the fiber. A data‐driven DAS channel selection improves image
Marcelo A. Soto, Diego Badillo‐San‐Juan   +1 more
wiley   +1 more source

Optimization in the design of a 12 gigahertz low cost ground receiving system for broadcast satellites. Volume 2: Antenna system and interference [PDF]

The antenna characteristics are analyzed of a low cost mass-producible ground station to be used in broadcast satellite systems. It is found that a prime focus antenna is sufficient for a low-cost but not a low noise system.
Albernaz, J., Han, C. C., Janky, J. M., Lusignan, B. B., Ohkubo, K.   +4 more
core   +1 more source

The GALFA-HI Survey: Data Release 1

, 2011
We present the Galactic Arecibo L-Band Feed Array HI (GALFA-HI) survey, and its first full data release (DR1). GALFA-HI is a high resolution (~ 4'), large area (13000 deg^2), high spectral resolution (0.18 km/s), wide band (-700 < v_LSR < +700 km/s ...
Ayesha Begum, Begum, Carl Heiles, Chepurnov, Cordes, Cornwell, Cortés-Medellín, Destry Saul, Dickey, Eric J. Korpela, Fisher, Freudling, Gibson, Giovanelli, Goldsmith, Grcevich, Guram, Haslam, Heiles, Heiles, Heiles, Heiles, Henning, Hsu, Högbom, J. E. G. Peek, Jana Grcevich, Kevin A. Douglas, Korpela, Krco, M. E. Putman, Marko Krčo, McClure-Griffiths, McClure-Griffiths, Min-Young Lee, O'Neil, Padman, Peek, Peek, Peek, Putman, Saul, Snežana Stanimirović, Stanimirovic, Stanimirović, Staveley-Smith, Steven J. Gibson, Stil, Taylor, Terzian, Timothy Robishaw, Weaver, Winkel   +52 more
core   +1 more source

Application of adaptive antenna techniques to future commercial satellite communication [PDF]

The purpose of this contract was to identify the application of adaptive antenna technique in future operational commercial satellite communication systems and to quantify potential benefits. The contract consisted of two major subtasks.
Ersoy, L., Lee, E. A., Matthews, E. W.
core   +1 more source

Optimum coding techniques for MST radars [PDF]

, 1986
The optimum coding technique for MST (mesosphere stratosphere troposphere) radars is that which gives the lowest possible sidelobes in practice and can be implemented without too much computing power. Coding techniques are described in Farley (1985).
Sulzer, M. P., Woodman, R. F.
core   +1 more source

RF characteristics of the hoop column antenna for the land mobile satellite system mission [PDF]

A communication system using a satellite with a 118 meter diameter quad aperture antenna to provide telephone service to mobile users remotely located from the large metropolitan areas where the telephone companies are presently implementing their ...
Foldes, P.
core   +1 more source

Collaborative Beamforming for Distributed Wireless Ad Hoc Sensor Networks

, 2005
The performance of collaborative beamforming is analyzed using the theory of random arrays. The statistical average and distribution of the beampattern of randomly generated phased arrays is derived in the framework of wireless ad hoc sensor networks ...
Mitran, Patrick, Ochiai, Hideki, Poor, H. Vincent, Tarokh, Vahid   +3 more
core   +3 more sources