Results 91 to 100 of about 27,387 (213)

2D‐RIXS: resonant inelastic X‐ray scattering microscopy with high energy and spatial resolutions

Journal of Synchrotron Radiation, Volume 33, Issue 3, Page 739-745, May 2026.
A resonant inelastic X‐ray scattering microscopy system with a spatial resolution of 1.0 µm combined with ultrahigh energy resolution in the soft X‐ray regime has been established.A two‐dimensional resonant inelastic X‐ray scattering (2D‐RIXS) microscopy system has been developed at beamline BL02U of NanoTerasu.
Kohei Yamamoto, Hakuto Suzuki, Jun Miyawaki   +2 more
wiley   +1 more source

Comparative simulations of Fresnel holography methods for atomic waveguides

New Journal of Physics, 2016
We have simulated the optical properties of micro-fabricated Fresnel zone plates (FZPs) as an alternative to spatial light modulators for producing non-trivial light potentials to trap atoms within a lensless Fresnel arrangement.
V A Henderson, P F Griffin, E Riis, A S Arnold   +3 more
doaj   +1 more source

Criteria for selecting the Paganin‐filter reconstruction parameter in X‐ray phase‐contrast tomography

Journal of Synchrotron Radiation, Volume 33, Issue 3, Page 746-758, May 2026.
The development of a criterion for near‐optimal selection of the Paganin‐filter parameter based on noise power analysis measured via an image's noise power spectrum is described.The Paganin filter, widely employed in propagation‐based phase‐contrast X‐ray computed tomography with synchrotron light, attenuates phase effects and suppresses high‐frequency
Eduardo X. Miqueles, Everton L. de Oliveira, Murilo Carvalho, David M. Paganin   +3 more
wiley   +1 more source

Fresnel zone considerations for reflection and scatter from refractive index irregularities [PDF]

, 1983
Several different echoing mechanisms are proposed to explain VHF/UHF scatter from clear air; (1) anisotropic scatter; (2) Fresnel reflection, and (3) Fresnel scatter, in order to account for the spatial (angle and range) and temporal dependence of the ...
Doviak, R. J., Zrnic, D. S.
core   +1 more source

Phase and absorbance retrieval in X‐ray holographic microscopy under weak illumination using physics‐driven neural networks

Journal of Synchrotron Radiation, Volume 33, Issue 3, Page 794-805, May 2026.
A physics‐driven deep learning model enables single‐shot retrieval of 3D phase and absorbance from shot‐noise‐limited hard X‐ray holograms. Validated on both synthetic and experimental data, it provides robust reconstruction under weak illumination.X‐ray holographic microscopy is a three‐dimensional (3D) imaging technique for nanoscale‐resolution ...
Jihwan Kim, Jun Lim, Sugeun Jo, Sungho Park, Sang Joon Lee   +4 more
wiley   +1 more source

Method and apparatus for determining electromagnetic characteristics of large surface area passive reflectors Patent [PDF]

, 1966
Apparatus for measuring backscatter and transmission characteristics of sample segment of large spherical passive ...
Kampinsky, A.
core   +1 more source

Performance Comparison between Nonidentical Segmented Exponential Concave and Nonidentical Segmented Exponential Convex Serrated CATRs

International Journal of Antennas and Propagation, 2008
This paper presented a theoretical and numerical assessment for nonidentical segmented exponential- (NISE-) convex and NISE-concave serrated plane CATRs by changing number of serrations.
T. Venkata Rama Krishna, P. Siddaiah, B. Prabhakara Rao   +2 more
doaj   +1 more source

Electrons and X‐rays for diffraction and imaging

Acta Crystallographica Section D, Volume 82, Issue 5, Page 446-456, May 2026.
The use of X‐rays and electrons for diffraction and imaging of soft biological samples is compared.A comparison is provided between the use of electrons and X‐rays for collecting diffraction data from small protein crystals and imaging data from cells and tissues.
Colin Nave, Pedro Nunes, Alistair Siebert   +2 more
wiley   +1 more source

Adsorption Preceding Wetting Front Controls Seismic Velocity

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Rock elasticity varies with both humidity and water saturation, yet their combined effects remain poorly understood, although in nature vapor adsorption and liquid infiltration occur simultaneously. Here, we present experimental data of P‐wave velocity and volume expansion in a free‐standing sandstone subject to progressive wetting.
Rui Wu, Hongpu Kang, Fuqiang Gao, Xiangyuan Peng, Shuangyong Dong, Chenxi Zhao, Bing Qiuyi Li, Kerry Leith, Qinghua Lei, Gennady Y. Gor, Paul A. Selvadurai, Xiaoping Jia   +11 more
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