Results 81 to 90 of about 151,346 (397)

Flow structure and optical beam propagation in high-Reynolds-number gas-phase shear layers and jets [PDF]

, 2001
We report on the structure of the scalar index-of-refraction field generated by turbulent, gas-phase, incompressible and compressible shear layers and incompressible jets, and on associated beam-propagation aero-optical phenomena.
Catrakis, H. J., Dimotakis, P. E., Fourguette, D. C.   +2 more
core   +1 more source

Hyperspectral compressive wavefront sensing

High Power Laser Science and Engineering, 2023
Abstract Presented is a novel way to combine snapshot compressive imaging and lateral shearing interferometry in order to capture the spatio-spectral phase of an ultrashort laser pulse in a single shot. A deep unrolling algorithm is utilized for snapshot compressive imaging reconstruction due to its parameter efficiency and superior speed relative ...
Sunny Howard, Jannik Esslinger, Robin H. W. Wang, Peter Norreys, Andreas Döpp   +4 more
openaire   +4 more sources

Enhancing Ultrasound Power Transfer: Efficiency, Acoustics, and Future Directions

Advanced Materials, EarlyView.
Implantable devices significantly enhance healthcare but are limited by battery life. Ultrasound power transfer technology offers a promising solution for sustainable operation. This review addresses gaps in current research, particularly in sound field analysis and energy efficiency optimization.
Yi Zheng, Zhuomin Zhang, Yanhu Zhang, Qiqi Pan, Xiaodong Yan, Xuemu Li, Zhengbao Yang   +6 more
wiley   +1 more source

Assessing the growth kinetics and stoichiometry of Escherichia coli at the single‐cell level

Engineering in Life Sciences, Volume 23, Issue 1, January 2023., 2023
Abstract Microfluidic cultivation and single‐cell analysis are inherent parts of modern microbial biotechnology and microbiology. However, implementing biochemical engineering principles based on the kinetics and stoichiometry of growth in microscopic spaces remained unattained.
Katharina Smaluch, Bastian Wollenhaupt, Heiko Steinhoff, Dietrich Kohlheyer, Alexander Grünberger, Christian Dusny   +5 more
wiley   +1 more source

Precise Wavefront Correction with an Unbalanced Nulling Interferometer for Exo-Planet Imaging Coronagraphs

, 2008
Very high dynamical range coronagraphs targeting direct exo-planet detection (10^9 - 10^10 contrast) at small angular separation (few lambda/D units) usually require an input wavefront quality on the order of ten thousandths of wavelength RMS. We propose
Abe, Aime, Baba, Baudoz, Bordé, Bracewell, Brown, Codona, Evans, Fienup, Galicher, Guyon, J. Nishikawa, Kasdin, Kuchner, L. Abe, Lowman, Malbet, Mennesson, N. Murakami, Nihsikawa, Riaud, Roggenmann, Shao, T. Kotani, Tamura, Tavrov, Tolls, Zernike   +28 more
core   +1 more source

A Demonstration of Wavefront Sensing and Mirror Phasing from the Image Domain [PDF]

, 2014
In astronomy and microscopy, distortions in the wavefront affect the dynamic range of a high contrast imaging system. These aberrations are either imposed by a turbulent medium such as the atmosphere, by static or thermal aberrations in the optical path,
Cheetham, Anthony, Cvetojevic, Nick, Martinache, Frantz, Norris, Barnaby, Pope, Benjamin, Tuthill, Peter   +5 more
core   +2 more sources

Efficient Polarization-Insensitive Complex Wavefront Control Using Huygens’ Metasurfaces Based on Dielectric Resonant Meta-atoms [PDF]

, 2016
Metasurfaces have shown great promise for the control of optical wavefronts, thus opening new pathways for the development of efficient flat optics. In particular, Huygens’ metasurfaces based on all-dielectric resonant meta-atoms have already shown a ...
K. Chong, Lei Wang, I. Staude, Anthony James, J. Dominguez, Sheng Liu, G. Subramania, M. Decker, D. Neshev, I. Brener, Y. Kivshar   +10 more
semanticscholar   +1 more source

Scalable Lithium Niobate Nanoimprinting for Nonlinear Metalenses

Advanced Materials, EarlyView.
A broadband polycrystalline lithium niobate platform is developed for highly versatile and scalable fabrication of nonlinear metasurfaces. This work demonstrates simultaneous second harmonic generation and wavefront‐shaping via a metalens on this platform.
Ülle‐Linda Talts, Helena Weigand, Irene Occhiodori, Rachel Grange   +3 more
wiley   +1 more source

Adaptability analysis of travelling wavefront protection in LCC‐UHVDC transmission lines

IET Generation, Transmission & Distribution, 2023
The existing relay protections for line‐commutated converter (LCC)‐ultra high voltage DC (UHVDC) transmission lines are insufficient in protection sensitivity and operation speed. The travelling wavefront fault distance information can be used to improve
Zhongxue Chang, Chenhao Zhang, Bowen Chen, Guobing Song   +3 more
doaj   +1 more source

The coronagraphic Modal Wavefront Sensor: a hybrid focal-plane sensor for the high-contrast imaging of circumstellar environments [PDF]

, 2016
The raw coronagraphic performance of current high-contrast imaging instruments is limited by the presence of a quasi-static speckle (QSS) background, resulting from instrumental non-common path errors (NCPEs).
Keller, Christoph U., Korkiakoski, Visa, Pietrow, Alexander G. M., Snik, Frans, Wilby, Michael J.   +4 more
core   +3 more sources