Results 41 to 50 of about 58,862 (263)

Method of Range Ambiguity Suppression Combining Sparse Reconstruction and Matched Filtering

Leida xuebao, 2022
To a certain extent, SAR images are affected by range ambiguity due to antenna sidelobe characteristics and pulse operating system. The work of range ambiguity suppression focuses on SAR system design and signal processing.
Meng QI, Lijia HUANG, Xiaolan QIU, Wenyi ZHANG, Yuxin HU, Qingwei CHU   +5 more
doaj   +1 more source

$nπ$ phase ambiguity of cosmic birefringence

Physical review letters
We point out that the rotation angle $β$ of cosmic birefringence, which is a recently reported parity-violating signal in the cosmic microwave background (CMB), has a phase ambiguity of $nπ\,(n\in\mathbb{Z})$. This ambiguity has a significant impact on the interpretation of the origin of cosmic birefringence.
Naokawa, Fumihiro, Namikawa, Toshiya, Murai, Kai, Obata, Ippei, Kamada, Kohei   +4 more
openaire   +3 more sources

High‐Resolution MRI Revealed Different Etiology‐Specific Associations With Cerebral Infarction in Adult Moyamoya Vasculopathy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective High‐resolution MRI enables detailed assessment of intracranial vessel wall pathology in moyamoya vasculopathy. We aimed to classify adult moyamoya vasculopathy etiologies using high‐resolution MRI and to examine subtype‐specific associations between high‐resolution MRI features and ischemic infarction.
Guangsong Han, Jiachun Pan, Yuehui Hong, Xiaoyuan Fan, Ming Yao, Lixin Zhou, Yicheng Zhu, Feng Feng, Jun Ni   +8 more
wiley   +1 more source

Long‐Term Efficacy of Immunotherapy in Autoimmune Autonomic Ganglionopathy—A 10‐Year Follow Up Study

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Autoimmune autonomic ganglionopathy (AAG) is a rare but potentially treatable cause of severe autonomic failure. Evidence guiding long‐term immunotherapy, treatment sequencing, and residual autonomic impairment is limited. We evaluated long‐term treatment response, residual autonomic dysfunction, and relapse patterns in patients with
Giacomo Chiaro, Shiwen Koay, Gordon T. Ingle, Patricia McNamara, Laura Watson, Fion Bremner, Valeria Iodice   +6 more
wiley   +1 more source

Ambiguity Resolution for Passive 2-D Source Localization with a Uniform Circular Array

Sensors, 2018
This paper proposes two novel phase-based algorithms for the passive localization of a single source with a uniform circular array (UCA) under the case of measuring phase ambiguity based on two phase difference observation models, which are defined as ...
Jinlong Xin, Guisheng Liao, Zhiwei Yang, Haoming Shen   +3 more
doaj   +1 more source

Discrete ambiguities in phase-shift analysis [PDF]

Nuclear Physics A, 1975
In two practical examples (α-3He and α-α scattering) we investigate to what extent the elastic amplitude above the first inelastic threshold, determined from phase-shift analysis, is subject to ambiguity. We find that it is extremely difficult to determine the correct physical amplitude uniquely.
Heemskerk, A.C., Kok, L.P., Roo, M. de
openaire   +1 more source

Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading

Advanced Engineering Materials, EarlyView.
The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley   +1 more source

A Lightweight Procedural Layer for Hybrid Experimental–Computational Workflows in Materials Science

Advanced Engineering Materials, EarlyView.
We unveil a prototype hybrid‐workflow framework that fuses automatedcomputation with hands‐on experiments. Built atop pyiron, a lightweight, parameterized layer translates procedure descriptions into executable manual steps, syncing instrument settings, human interventions, and data capture in real‐time today.
Steffen Brinckmann, Sarath Menon, Raphael Röske, Johannes Steinhülb, Michael Selzer, Jan Janssen, Tilmann Hickel, Ruth Schwaiger, Jörg Neugebauer   +8 more
wiley   +1 more source

Research on the multiple subarray-pairs interferometric algorithm used in high resolution multibeam bathymetric system

Tongxin xuebao, 2010
An optimized subarray configuration was analyzed theoretically for the performance enhancement of inter-ferometric algorithm used in multibeam bathymetric system,and the relationship between phase ambiguity existed in in-terferometric algorithm and ...
ZHOU Tian1, LI Shan1, LI Hai-sen1, LIU Xiao1   +3 more
doaj   +2 more sources

Split-Band Interferometry-Assisted Phase Unwrapping for the Phase Ambiguities Correction [PDF]

Remote Sensing, 2017
Split-Band Interferometry (SBInSAR) exploits the large range bandwidth of the new generation of synthetic aperture radar (SAR) sensors to process images at subrange bandwidth. Its application to an interferometric pair leads to several lower resolution interferograms of the same scene with slightly shifted central frequencies.
Ludivine Libert, Dominique Derauw, Nicolas d'Oreye, Christian Barbier, Anne Orban   +4 more
openaire   +2 more sources