Results 61 to 70 of about 186,158 (254)

Regularization Methods for Phase Retrieval and Phase Contrast Tomography

Abstract and Applied Analysis, 2015
Phase contrast tomography is a high sensitivity medical imaging technique. Several regularization methods have been used in the literature to obtain stable solutions for the phase retrieval or the phase contrast tomography problems.
Bruno Sixou
doaj   +1 more source

GARLM: Greedy Autocorrelation Retrieval Levenberg–Marquardt Algorithm for Improving Sparse Phase Retrieval

Applied Sciences, 2018
The goal of phase retrieval is to recover an unknown signal from the random measurements consisting of the magnitude of its Fourier transform. Due to the loss of the phase information, phase retrieval is considered as an ill-posed problem.
Zhuolei Xiao, Yerong Zhang, Kaixuan Zhang, Dongxu Zhao, Guan Gui   +4 more
doaj   +1 more source

Octonion Phase Retrieval

IEEE Signal Processing Letters
Signal processing over hypercomplex numbers arises in many optical imaging applications. In particular, spectral image or color stereo data are often processed using octonion algebra. Recently, the eight-band multispectral image phase recovery has gained salience, wherein it is desired to recover the eight bands from the phaseless measurements. In this
Roman Jacome, Kumar Vijay Mishra, Brian M. Sadler, Henry Arguello   +3 more
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Phase Retrieval for Nilpotent Groups

Journal of Fourier Analysis and Applications, 2023
AbstractWe study the phase retrieval property for orbits of general irreducible representations of nilpotent groups, for the classes of simply connected Lie groups, and for finite groups. We prove by induction that in the Lie group case, all irreducible representations do phase retrieval. For the finite group case, we mostly focus on p-groups. Here our
Hartmut Führ, Vignon Oussa
openaire   +4 more sources

Loss of proton‐sensing TDAG8 increases tumor progression in mouse models of colon cancer

Molecular Oncology, EarlyView.
Loss of the pH‐sensing receptor TDAG8 accelerates colorectal cancer progression in mice. Animals lacking TDAG8 expression had increased tumor growth, DNA damage, and recruitment of tumor‐associated immune cells, including macrophages, neutrophils, and monocytes.
Ermanno Malagola, Yasmine Illi, Anna Bircher, Marijn Wilmink, Rachele F. Malagutti, Solenn Ottié, Cordelia Schuler, Pedro A. Ruiz, Cheryl de Vallière, Klaus Seuwen, Gerhard Rogler, Martin Hausmann   +11 more
wiley   +1 more source

Projections and phase retrieval

Applied and Computational Harmonic Analysis, 2017
We characterize collections of orthogonal projections for which it is possible to reconstruct a vector from the magnitudes of the corresponding projections. As a result we are able to show that in an $M$-dimensional real vector space a vector can be reconstructed from the magnitudes of its projections onto a generic collection of $N \geq 2M-1 ...
openaire   +2 more sources

Stability of phase retrievable frames [PDF]

SPIE Proceedings, 2013
In this paper we study the property of phase retrievability by redundant sysems of vectors under perturbations of the frame set. Specifically we show that if a set $\fc$ of $m$ vectors in the complex Hilbert space of dimension n allows for vector reconstruction from magnitudes of its coefficients, then there is a perturbation bound $ρ$ so that any ...
openaire   +2 more sources

PAK1 activation drives divergent resistance mechanisms to aromatase inhibition and tamoxifen in a luminal: A breast cancer model

Molecular Oncology, EarlyView.
Breast cancer remains a major cause of cancer death in women, frequently developing endocrine therapy resistance. This study demonstrates that upregulated p21‐activated kinase 1 (PAK1) activity drives resistance to tamoxifen and long‐term estrogen deprivation in ER+ breast cancer models.
Luisa Schwarzmüller, Janina Müller, Efstathios‐Iason Vlachavas, Lukas Beumers, Lena Fleischhacker, Sara Burmester, Angelika Wörner, Sabine Karolus, Dominic Helm, Cindy Körner, Stefan Wiemann   +10 more
wiley   +1 more source

Low-Bit-Depth Detection for Phase Retrieval with Higher Efficiency in Holographic Data Storage

Photonics
In the past, comprehensive information was imperative for image processing, prompting a preference for high-depth cameras. However, in our research, we discovered that the abundance of image details may impede phase retrieval.
Hongjie Liu, Shujun Zheng, Yongkun Lin, Haiyang Song, Xianmiao Xu, Xiong Li, Jihong Zheng, Qiang Cao, Xiao Lin, Xiaodi Tan   +9 more
doaj   +1 more source

Complete phase retrieval of photoelectron wavepackets

New Journal of Physics, 2020
Coherent, broadband pulses of extreme ultraviolet light provide a new and exciting tool for exploring attosecond electron dynamics. Using photoelectron streaking, interferometric spectrograms can be generated that contain a wealth of information about ...
L Pedrelli, P D Keathley, L Cattaneo, F X Kärtner, U Keller   +4 more
doaj   +1 more source