Results 71 to 80 of about 4,282 (222)

Novel Insights on Ocean Internal Waves: Quantitative Surface Manifestations and Upper Ocean Layer Displacements From the Surface Water Ocean Topography Mission (SWOT) Measurements

Earth and Space Science, Volume 13, Issue 2, February 2026.
Abstract The Surface Water and Ocean Topography (SWOT) mission provides unprecedented high‐resolution simultaneous observations of both sea surface height anomalies and sea surface roughness. Specifically, it enables more precise analysis of strong internal waves. Off the Amazon Shelf, in the Indonesian Seas, and near the Mascarene Ridge, internal wave
V. Cheshm Siyahi, V. Kudryavtsev, B. Chapron, F. Collard   +3 more
wiley   +1 more source

Large‐Scale Flow Toward Low‐Velocity Anomalies Reconciles Seismic and Geodynamic Constraints in the Deepest Mantle Beneath Alaska

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract Deep mantle downwellings are typically located away from the two Large Low‐Velocity Provinces (LLVPs) in Earth's mantle. Geodynamic models based on global seismic tomography generally predict that convective flow at the core‐mantle boundary spreads laterally away from downwelling regions and toward LLVPs.
Jonathan Wolf
wiley   +1 more source

Focusing Microwaves in the Fresnel Zone With a Cavity-Backed Holographic Metasurface

IEEE Access, 2018
We present the design and experimental demonstration of a cavity-backed, holographic metasurface capable of focusing microwaves in the Fresnel zone. The circular cavity consists of two stacked plates: microwaves are injected into the bottom plate via a ...
Vinay R. Gowda, Mohammadreza F. Imani, Timothy Sleasman, Okan Yurduseven, David R. Smith   +4 more
doaj   +1 more source

Wasserinduzierte lokale Redoxreaktionen an einzelnen Ti3C2Tx‐MXene‐Flocken in wässriger Umgebung

Angewandte Chemie, Volume 138, Issue 4, 22 January 2026.
Lokale Chemie einzelner Ti3C2Tx‐MXene‐Flocken und eingeschlossenes Wasser werden mittels In‐situ‐Rastertransmissionsmikroskopie (STXM) in wässriger Umgebung untersucht. Wir zeigen, dass sich durch Wasser ausgelöste Redoxreaktionen ungleichmäßig über die MXene‐Flocken verteilen, wenn diese nacheinander sauren und neutralen wässrigen Lösungen mit ...
Faidra Amargianou, Peer Bärmann, Namrata Sharma, Mailis Lounasvuori, Andreas Furchner, Ralfy Kenaz, Saptarshi Ghosh, Jan‐David Förster, Christopher Pöhlker, Markus Weigand, Tristan Petit   +10 more
wiley   +1 more source

Deabsorption Prestack Time Migration Combining Stationary-phase Method in Dip-angle Domain：A Case Study of Seismic Data from the Ganquan Block in the Ordos Basin

CT Lilun yu yingyong yanjiu
The Ganquan Loess Plateau Block in the Ordos Basin exhibits promising hydrocarbon exploration potential in its karst reservoirs. However, the seismic imaging quality obtained using conventional methods remains suboptimal due to challenges posed by thick ...
Zhenchuan WANG, Yuedong LI, Lei JIANG, Yinnan ZHE, Zhiwei LIU, Shiguang DENG, Zhengwei LI, Wenzheng RONG   +7 more
doaj   +1 more source

A MEMS-Controllable Fresnel Zone Plate for Miniaturized UV Spectrometer

Proceedings, 2017
This work presents the design and simulation of a MEMS-controllable linear motion Fresnel Zone Plate (FZP). The focal length of an FZP is a function of incident wavelength.
Elnaz Afsharipour, Pawel Glowacki, Cyrus Shafai   +2 more
doaj   +1 more source

Water‐Induced Local Redox Reactions on Individual Ti3C2Tx MXene Flakes in Aqueous Environment

Angewandte Chemie International Edition, Volume 65, Issue 4, 22 January 2026.
The local chemistry of individual Ti3C2Tx MXene flakes and confined water are investigated by in situ Scanning Transmission X‐ray Microscopy (STXM) in aqueous environment. We reveal water‐induced redox reactions non‐uniformly distributed over the MXene flakes upon sequential exposure to acidic and neutral aqueous solution containing alkali cations ...
Faidra Amargianou, Peer Bärmann, Namrata Sharma, Mailis Lounasvuori, Andreas Furchner, Ralfy Kenaz, Saptarshi Ghosh, Jan‐David Förster, Christopher Pöhlker, Markus Weigand, Tristan Petit   +10 more
wiley   +1 more source

Pattern of Inner‐Core Differential Rotation From Long‐Term Earthquake Sequences and USArray Network

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract How the differential rotation of the Earth's inner core (IC) has changed over time provides insights into the dynamics of the Earth's interior. Analyses of repeating earthquakes (doublets) have yielded different models. Here we present an event‐based investigation using individual events from long‐term earthquake sequences, which improves ...
Kaixin Wu, Xiaodong Song, Yi Yang
wiley   +1 more source

Technologies for Near-Field Focused Microwave Antennas

International Journal of Antennas and Propagation, 2017
This paper provides a review spanning different technologies used to implement near-field focused antennas at the microwave frequency band up to a few tens of GHz: arrays of microstrip patches and printed dipoles, arrays of dielectric resonator antennas,
Paolo Nepa, Alice Buffi, Andrea Michel, Giuliano Manara   +3 more
doaj   +1 more source

MRI Compatible Planar Material Acoustic Lenses

Applied Sciences, 2018
Zone plate lenses are used in many areas of physics where planar geometry is advantageous in comparison with conventional curved lenses. There are several types of zone plate lenses, such as the well-known Fresnel zone plates (FZPs) or the more recent ...
Daniel Tarrazó-Serrano, Sergio Castiñeira-Ibáñez, Eugenio Sánchez-Aparisi, Antonio Uris, Constanza Rubio   +4 more
doaj   +1 more source