Results 61 to 70 of about 4,282 (222)

Signal‐to‐noise and spatial resolution in in‐line imaging. 3. Optimization using a simple model

Journal of Synchrotron Radiation, EarlyView.
Geometrical magnification and X‐ray energy are optimized with respect to spatial resolution, contrast, noise, radiation dose and other image quality characteristics. The optimization is performed using a simple theoretical model of a homogeneous edge feature embedded in a bulk uniform sample, and the resulting generic analytical expressions for image ...
Timur E. Gureyev, David M. Paganin, Harry M. Quiney   +2 more
wiley   +1 more source

Wood zone plate fishnet metalens

EPJ Applied Metamaterials, 2015
Fresnel-zone plate lenses provide focusing performance while having low profile. Unfortunately, they usually display higher reflection losses than conventional dielectric lenses.
Orazbayev Bakhtiyar, Beruete Miguel, Navarro-Cía Miguel   +2 more
doaj   +1 more source

Defocused illumination with beam‐shaping condenser for uniform wide‐field X‐ray imaging

Journal of Synchrotron Radiation, EarlyView.
A defocused illumination method based on a beam‐shaping condenser to suppress fringe artifacts arising from rectangular aperture diffraction and sub‐grating interference is developed, providing an effective and practical approach for achieving wide‐field and uniform illumination in X‐ray microscopy.The beam‐shaping condenser (BSC) has become a key ...
Kuanqiang Zhang, Yijue Luo, Yunfan Di, Chenfei Guo, Changhao Li, Menghui He, Chao Zhang, Fangfang Peng, Wen Liu, Zhao Wu, Yong Guan, Yangchao Tian, Gang Liu   +12 more
wiley   +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

Highly Selective Toward HER or CO2RR by Regulating Cu Single and Dual Atoms on g‐C3N4

Advanced Functional Materials, Volume 36, Issue 10, 2 February 2026.
This systematic study provides insights into the design of electrocatalysts for hydrogen evolution reaction (HER) and carbon dioxide reduction (CO2RR). It serves as a useful guide for tuning catalyst architecture toward efficient multifunctional performance by varying synthetic parameters, demonstrating the impact of copper (Cu) species ranging from ...
Wan‐Ting Chen, Hung Wei Shiu, Yu‐Xun Chen, Erdembayalag Batsaikhan, Yu‐Ling Lai, Su Ling Cheng, Tohru Araki, Jyh‐Fu Lee, Michitoshi Hayashi, Yao‐Jane Hsu   +9 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

Phase Topology Stability of an Optical Vortex via an Electrically Controlled Twist‐Planar Oriented Liquid Crystal Fresnel Lens

Advanced Optical Materials, Volume 14, Issue 5, 2 February 2026.
A simple and efficient method for determining the stability of optical vortices via Fourier transform using a conventional spherical lens is presented. The theoretical and experimental results demonstrate a practical approach to directly and unambiguously measure the magnitude and sign of the topological charge of a beam without altering an ...
Elena Melnikova, Katsiaryna Pantsialeyeva, Dmitry Gorbach, Alexei Tolstik, Sergei Slussarenko Jr., Alina Karabchevsky   +5 more
wiley   +1 more source

Localizing Access Point Through Simple Gesture

IEEE Access, 2018
It is important to obtain the location of an access point (AP), such as in the scenario of finding rogue AP in public places or designing indoor positioning system based on AP locations.
Yongle Chen, Xiaojian Wang, Dan Yu, Yuli Yang, Jian Chen   +4 more
doaj   +1 more source

Fresnel incoherent correlation holography with single camera shot

Opto-Electronic Advances, 2020
Fresnel incoherent correlation holography (FINCH) is a self-interference based super-resolution three-dimensional imaging technique. FINCH in inline configuration requires an active phase modulator to record at least three phase-shifted camera shots to ...
Vijayakumar Anand, Katkus Tomas, Lundgaard Stefan, Linklater Denver P., Ivanova Elena P., Ng Soon Hock, Juodkazis Saulius   +6 more
doaj   +1 more source

Optically‐Coupled X‐Ray Computed Laminography System for High‐Speed Inspection of Lithium‐Ion Batteries

Advanced Science, Volume 13, Issue 7, 3 February 2026.
This study presents an optically coupled X‐ray computed laminography system for high‐speed inspection of lithium‐ion batteries. A scintillator serving as a virtual detector decouples spatial resolution from the X‐ray focal spot size, enabling defect detection even with large‐spot, high‐power X‐ray tubes.
Jaeyoung Im, Jun Heo, Seunguk Cheon, Jichan Kim, Sung Oh Cho   +4 more
wiley   +1 more source