Results 81 to 90 of about 22,111 (245)

Nomarski imaging interferometry to measure the displacement field of MEMS [PDF]

, 2006
We propose to use a Nomarski imaging interferometer to measure the out-of-plane displacement field of MEMS. It is shown that the measured optical phase arises both from height and slope gradients.
Aswendt, Cusack, Dubois, Dubois, Françon, Gleyzes, Gleyzes, Gleyzes, Haque, He, Hung, Lavrik, Lessor, Montarou, Nomarski, Read, Schulz, Sheppard, Weihs   +18 more
core   +3 more sources

Food Contamination and Safety in Nigeria: A Systematic Synthesis of Heavy Metals, Microbial Pathogens, and Health Risk Metrics

Food Safety and Health, EarlyView.
This is an infographic driver of food contaminants and health effects. ABSTRACT Food safety remains a critical challenge in Nigeria due to rapid urbanization and weak regulatory enforcement. This systematic review synthesizes empirical evidence from 2015 to 2025 to characterize food contaminant profiles and associated human health risks in Nigeria ...
Cecilia Nwadiuto Obasi, Naomi A. Mogborukor, Baridoo Donatus Dooka, Polycarp Dauda Madaki, Chiara Frazzoli, Mohamed Haddad, Orish Ebere Orisakwe   +6 more
wiley   +1 more source

Segmentation-aided phase unwrapping for 3D reconstruction with airborne array-InSAR images

National Science Open
Unmanned aerial vehicle (UAV) array InSAR is a new type of single-flight 3D SAR imaging system with the advantages of high coherence and resolution. However, due to the low altitude of the platform, the elevation ambiguity of the system is smaller than ...
Zhang Xin, Hu Fengming, Xu Feng
doaj   +1 more source

Spatially resolved stress measurements in materials with polarization-sensitive optical coherence tomography: image acquisition and processing aspects

, 2011
We demonstrate that polarization-sensitive optical coherence tomography (PS-OCT) is suitable to map the stress distribution within materials in a contactless and non-destructive way. In contrast to transmission photoelasticity measurements the samples do
Arminger, Crespo, De la Torre-Ibarra, Ghiglia, Götzinger, Hee, Hitzenberger, Huang, Jacquot, Jessop, Larkin, Larkin, Leitgeb, Nordström, Oh, Park, Quiroga, Ramesh, Ruiz, Schmitt, Servin, Stifter, Stifter, Stroebel, Szkulmowska, Villa, Weickert, Weickert, Wiesauer, Wiesauer, Wiesauer   +30 more
core   +1 more source

Ameliorative Minimum Cost Flow Algorithm for Phase Unwrapping [PDF]

, 2003
Ameliorative minimum cost flow algorithm is put forward in this paper Based on MCF,. As we all know, MCF is one phase unwrapping algorithm based on network flow and it is used widely because of many merits.
Ting-chen, Jiang
core   +1 more source

Coherence‐Gated Mirau Interferometry for Single‐Shot Quantitative Phase Imaging and Motion Sensing

Laser &Photonics Reviews, EarlyView.
This paper presents a compact add‐on module converting a Mirau or other on‐axis interferometer into a single‐shot quantitative phase imaging system using coherence gating and precise optical path matching. Demonstrations include time‐resolved imaging of human cells and streaming red blood cells, visualization of evaporation dynamics in liquid mixtures,
Petr Bouchal, Martin Konečný, Zdeněk Nováček, Radim Chmelík, Zdeněk Bouchal   +4 more
wiley   +1 more source

Quantitative Assessment of Visible Nigrosome‐1 in Patients with Parkinson's Disease

Movement Disorders Clinical Practice, EarlyView.
Abstract Background The nigrosome‐1 (N1) sign on susceptibility‐weighted imaging (SWI) typically disappears in Parkinson's disease (PD), though some patients can show uni−/bilaterally preserved N1. Objective Investigating whether visible nigrosomes in PD patients differ from those of healthy subjects (HC). Methods Forty‐eight PD and 35 HC underwent 3 T‐
Maria Eugenia Caligiuri, Ilaria Chimento, Marida De Maria, Emma Biondetti, Jolanda Buonocore, Valerio Riccardo Aquila, Maria Celeste Bonacci, Emanuele Tinelli, Umberto Sabatini, Aldo Quattrone, Andrea Quattrone   +10 more
wiley   +1 more source

Phase reconstruction of spectrograms based on a model of repeated audio events

, 2015
Phase recovery of modified spectrograms is a major issue in audio signal processing applications, such as source separation. This paper introduces a novel technique for estimating the phases of components in complex mixtures within onset frames in the ...
Badeau, Roland, David, Bertrand, Magron, Paul   +2 more
core   +2 more sources

In Vivo Mapping of Catecholaminergic Loss and Iron Deposition in Huntington's Disease

Movement Disorders, EarlyView.
Abstract Background The pathophysiology of Huntington's disease (HD) remains obscure. Magnetic resonance imaging (MRI) can reveal in vivo molecular changes related to disease pathology. Objectives To investigate catecholaminergic neuronal integrity and subcortical brain iron accumulation in HD employing neuromelanin‐sensitive MRI, and quantitative ...
Edoardo R. de Natale, Heather Wilson, Efstratios Karavasilis, Athanasia Liozidou, Chrisoula Kartanou, Georgios Velonakis, Jens Kuhle, Ioannis Zalonis, Georgia Karadima, Leonidas Stefanis, Georgios Koutsis, Marios Politis   +11 more
wiley   +1 more source

Spatial Relation Awareness Module for Phase Unwrapping

Photonics
Phase unwrapping is a technique used to recover the original phase from the wrapped phase in the range (−π,π]. Various methods have been proposed for phase unwrapping.
Chiori Azuma, Tomoyoshi Ito, Tomoyoshi Shimobaba   +2 more
doaj   +1 more source