Results 1 to 10 of about 1,397 (98)

Influence of Mie scattering on nanoparticles with different particle sizes and shapes: photometry and analytical ultracentrifugation with absorption optics [PDF]

open access: yesJournal of the Serbian Chemical Society, 2005
Nanoparticles are used in large quantities for very different applications. A precise determination of the diameter and the particle size distribution which is responsible for the application properties is therefore essential.
M. D. LECHNER
doaj   +5 more sources

Multi-Site Simultaneous Time-Resolved Photometry with a Low Cost Electro-Optics System

open access: yesSensors, 2017
Sunlight reflected off of resident space objects can be used as an optical signal for astrometric orbit determination and for deducing geometric information about the object.
Forrest Gasdia   +2 more
doaj   +3 more sources

Fast Inline Microscopic Computational Imaging

open access: yesSensors, 2022
Inline inspection is becoming an essential tool for industrial high-quality production. Unfortunately, the desired acquisition speeds and needs for high-precision imaging are often at the limit of what is physically possible, such as a large field of ...
Laurin Ginner   +2 more
doaj   +1 more source

JWST Observations of the Enigmatic Y-Dwarf WISE 1828+2650. I. Limits to a Binary Companion

open access: yesThe Astrophysical Journal, 2023
The Y-dwarf WISE 1828+2650 is one of the coldest known brown dwarfs with an effective temperature of ∼300 K. Located at a distance of just 10 pc, previous model-based estimates suggest WISE1828+2650 has a mass of ∼5–10 M _J , making it a valuable ...
Matthew De Furio   +22 more
doaj   +1 more source

Macular pigment optical density measured by heterochromatic modulation photometry. [PDF]

open access: yesPLoS ONE, 2014
PURPOSE:To psychophysically determine macular pigment optical density (MPOD) employing the heterochromatic modulation photometry (HMP) paradigm by estimating 460 nm absorption at central and peripheral retinal locations. METHODS:For the HMP measurements,
Cord Huchzermeyer   +5 more
doaj   +1 more source

Modeling and Analysis of an Echo Laser Pulse Waveform for the Orientation Determination of Space Debris

open access: yesRemote Sensing, 2020
Orientation information of space debris is required to improve the orbital prediction accuracy for mitigation or elimination of a significant threat to not only human space activities but also operational satellites.
Hyung-Chul Lim   +6 more
doaj   +1 more source

DDO68 C: The Actual Appearance of a Ghost Satellite Dwarf through Adaptive Optics at the Large Binocular Telescope

open access: yesThe Astrophysical Journal Letters, 2023
Through adaptive optics (AO) imaging with the SOUL+LUCI instrument at the Large Binocular Telescope we were able to resolve, for the first time, individual stars in the gas-rich galaxy DDO68 C. This system was already suggested to be interacting with the
Francesca Annibali   +9 more
doaj   +1 more source

Fast CCD Photometry in the Taiwan-America Occultation Survey

open access: yesOpen Astronomy, 2003
We describe the efforts of the Taiwan-America Occultation Survey (TAOS) project to develop a data acquisition and analysis scheme for fast CCD imaging photometry.
Chen W. P.   +18 more
doaj   +1 more source

Rationale for the Choice of the Ellipsoidal Reflector Parameters for Biomedical Photometers

open access: yesПриборы и методы измерений, 2021
Biomedical photometersʼ information-measuring systems with ellipsoidal reflectors have acceptable results in determining of biological tissues optical properties in the visible and near-infrared spectral range. These photometers make it possible to study
N. V. Bezuglaya   +5 more
doaj   +1 more source

Angular Photometry of Biological Tissue by Ellipsoidal Reflector Method

open access: yesПриборы и методы измерений, 2019
Angular measurements in optics of biological tissues are used for different applied spectroscopic task for roughness surface control, define of refractive index and for research of optical properties.
M. A. Bezuglyi   +3 more
doaj   +1 more source

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