Signal dependence of inter-pixel capacitance in hybridized HgCdTe H2RG arrays for use in James Webb space telescope's NIRcam

2016 ◽  
Author(s):  
Kevan Donlon ◽  
Zoran Ninkov ◽  
Stefi Baum
Keyword(s):  
Signal Dependence

Investigation of the photoacoustic signal dependence on laser power

2007 ◽  
Author(s):  
Jan Niemi ◽  
Torbjörn Löfqvist ◽  
Per Gren
Keyword(s):  
Laser Power ◽  
Photoacoustic Signal ◽  
Signal Dependence

scholarly journals To switch or not to switch – a machine learning approach for ferroelectricity

2020 ◽  
Vol 2 (5) ◽  
pp. 2063-2072 ◽  
Author(s):  
Sabine M. Neumayer ◽  
Stephen Jesse ◽  
Gabriel Velarde ◽  
Andrei L. Kholkin ◽  
Ivan Kravchenko ◽  
...  
Keyword(s):  
Machine Learning ◽  
Measured Signal ◽  
Learning Approach ◽  
Two Dimensional ◽  
Dimensional Representation ◽  
Machine Learning Methods ◽  
Machine Learning Approach ◽  
Signal Dependence ◽  
Two Parameter

The introduced two-dimensional representation of two-parameter signal dependence allows for clear interpretation and classification of the measured signal upon using machine learning methods.

Signal Dependence on Light Modulation Frequency in Optogalvanic Spectroscopy

1999 ◽  
Vol 53 (12) ◽  
pp. 1651-1653 ◽  
Author(s):  
D. A. Rusak ◽  
J. E. Anderson ◽  
R. A. Keller ◽  
C. W. Wilkerson ◽  
E. E. Kunhardt
Keyword(s):  
Modulation Frequency ◽  
Light Modulation ◽  
Optogalvanic Spectroscopy ◽  
Signal Dependence

scholarly journals Photoacoustic Properties of Polypyrrole Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2457
Author(s):  
Peter Keša ◽  
Monika Paúrová ◽  
Michal Babič ◽  
Tomáš Heizer ◽  
Petr Matouš ◽  
...  
Keyword(s):  
Contrast Agent ◽  
Photoacoustic Imaging ◽  
Particle Surface ◽  
Photoacoustic Signal ◽  
Ammonium Persulphate ◽  
Coated Nanoparticles ◽  
Polypyrrole Nanoparticles ◽  
Signal Dependence

Photoacoustic imaging, an emerging modality, provides supplemental information to ultrasound imaging. We investigated the properties of polypyrrole nanoparticles, which considerably enhance contrast in photoacoustic images, in relation to the synthesis procedure and to their size. We prepared polypyrrole nanoparticles by water-based redox precipitation polymerization in the presence of ammonium persulphate (ratio nPy:nOxi 1:0.5, 1:1, 1:2, 1:3, 1:5) or iron(III) chloride (nPy:nOxi 1:2.3) acting as an oxidant. To stabilize growing nanoparticles, non-ionic polyvinylpyrrolidone was used. The nanoparticles were characterized and tested as a photoacoustic contrast agent in vitro on an imaging platform combining ultrasound and photoacoustic imaging. High photoacoustic signals were obtained with lower ratios of the oxidant (nPy:nAPS ≥ 1:2), which corresponded to higher number of conjugated bonds in the polymer. The increasing portion of oxidized structures probably shifted the absorption spectra towards shorter wavelengths. A strong photoacoustic signal dependence on the nanoparticle size was revealed; the signal linearly increased with particle surface. Coated nanoparticles were also tested in vivo on a mouse model. To conclude, polypyrrole nanoparticles represent a promising contrast agent for photoacoustic imaging. Variations in the preparation result in varying photoacoustic properties related to their structure and allow to optimize the nanoparticles for in vivo imaging.

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