Results 11 to 20 of about 2,809,534 (302)

Sleep Deprivation Does Not Influence Photic Resetting of Circadian Activity Rhythms in Drosophila

open access: yesClocks & Sleep, 2022
Previous investigations in humans and rodent animal models have assessed the interplay of sleep in the circadian system’s phase responses to nighttime light exposure.
David C. Negelspach   +3 more
doaj   +1 more source

Zebrafish Circadian Clock Entrainment and the Importance of Broad Spectral Light Sensitivity

open access: yesFrontiers in Physiology, 2020
One of the key defining features of an endogenous circadian clock is that it can be entrained or set to local time. Though a number of cues can perform this role, light is the predominant environmental signal that acts to entrain circadian pacemakers in ...
Inga A. Frøland Steindal   +2 more
doaj   +1 more source

A Straightness Error Compensation System for Topography Measurement Based on Thin Film Interferometry

open access: yesPhotonics, 2021
Straightness error compensation is a critical process for high-accuracy topography measurement. In this paper, a straightness measurement system was presented based on the principle of fringe interferometry. This system consisted of a moving optical flat
Hang Su   +4 more
doaj   +1 more source

One-Dimensional Photonic Crystals with Different Termination Layer Thicknesses and Very Narrow Bloch Surface Wave and Guided Wave Based Resonances for Sensing Applications

open access: yesPhotonics, 2022
We demonstrate an efficient sensing of both gaseous and aqueous analytes utilizing Bloch surface waves (BSWs) and guided waves (GWs) excited on a truncated one-dimensional photonic crystal (1DPhC) composed of six TiO2/SiO2 bilayers with a termination ...
Tomas Fort   +4 more
doaj   +1 more source

Flow Dynamics and Acoustics from Glottal Vibrations at Different Frequencies

open access: yesAcoustics, 2022
Glottal vibration is fundamental to breathing-related disorders and respiratory sound generation. However, responses of the flow and acoustics to glottal vibrations of different frequencies are unclear.
Jinxiang Xi   +3 more
doaj   +1 more source

Pixelwise Phase Unwrapping Based on Ordered Periods Phase Shift

open access: yesSensors, 2019
The existing phase-shift methods are effective in achieving high-speed, high-precision, high-resolution, real-time shape measurement of moving objects; however, a phase-unwrapping method that can handle the motion of target objects in a real environment ...
Satoshi Tabata   +3 more
doaj   +1 more source

Theory for the Beam Splitter in Quantum Optics: Quantum Entanglement of Photons and Their Statistics, HOM Effect

open access: yesMathematics, 2022
The theory of the beam splitter (BS) in quantum optics is well developed and based on fairly simple mathematical and physical foundations. This theory has been developed for any type of BS and is based on the constancy of the reflection coefficients R ...
Dmitry Makarov
doaj   +1 more source

Investigation of Quadrate Fresnel Zone Plates Fabricated by Femtosecond Laser Direct Writing

open access: yesApplied Sciences, 2022
The circular Fresnel zone plate (FZP) has been extensively used in micro-optics due to its outstanding focusing performance. Despite that, the curved edge of the circular zone has drawbacks limiting its use in terahertz imaging, array generator, and ...
Xiaoyan Sun   +3 more
doaj   +1 more source

Transmission Phase Control of Annular Array Transducers for Efficient Second Harmonic Generation in the Presence of a Stress-Free Boundary

open access: yesApplied Sciences, 2021
The through-transmission (TT) method is mainly used to measure the amplitude of the second harmonic from which the acoustic nonlinear parameter is determined for early damage detection of materials.
Hyunjo Jeong, Hyojeong Shin
doaj   +1 more source

Gouy phase compensation in quasi-phase matching [PDF]

open access: yes, 2008
In any focussed nonlinear interaction the focus induced phase shift, known as the Gouy phase shift, provides an imperfection in phase matching for any linearly invariant material.
Belmonte   +8 more
core   +1 more source

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