Results 161 to 170 of about 38,857 (309)

Meta Shack–Hartmann wavefront sensor with large sampling density and large angular field of view: phase imaging of complex objects

Light: Science & Applications
Shack–Hartmann wavefront sensors measure the local slopes of an incoming wavefront based on the displacement of focal spots created by a lenslet array, serving as key components for adaptive optics for astronomical and biomedical imaging.
Gi-Hyun Go, Dong-gu Lee, Jaeyeon Oh, Gookho Song, Doeon Lee, Mooseok Jang   +5 more
doaj   +1 more source

Precise 3D Tracking of Highly Non‐Planar Eukaryotic Flagellar Beating Patterns Using Digital Holographic Microscopy

Small Methods, EarlyView.
The 3D beating dynamics of eukaryotic flagella drive motility, sensory functions, and resource acquisition, yet highly non‐planar beating patterns remain poorly characterized. Based on Digital Holographic Microscopy, holoV3C enables label‐free 3D reconstruction of such complex dynamics with 53 nm axial resolution, demonstrated on mouse sperm and ...
Patryk Nienaltowski, Jonasz Słomka, Federica Miano, Thomas Kiørboe, Clara Martínez‐Pérez, Tristan Colomb, Yves Emery, Roman Stocker   +7 more
wiley   +1 more source

Structural, Compositional, and Dielectric State Profiling in Label‐Free Single‐Cell Monitoring

Small Methods, EarlyView.
Label‐free single‐cell monitoring leverages distinct physical interactions to access structural, compositional, and dielectric states of cells, enabling non‐perturbative, repeatable, and information‐rich measurements across diverse biological contexts. This review organizes representative platforms by intrinsic state variables and connects measurement ...
Changi Baek, Youngho Song, Seongcheol Park, Sujin Hyung, Sang Eun Yoon, Yong Jae Shin, Soo‐Yeon Cho   +6 more
wiley   +1 more source

Comprehensive Design and Experimental Validation of 30 kV Ultra‐Fast Flexible Controllable Arresters for HVDC Systems

High Voltage, EarlyView.
ABSTRACT To effectively suppress transient overvoltages in HVDC systems, the design and experimental validation of a multi‐module series controllable arrester are presented. The voltage‐limiting performance, series voltage equalisation capability, and robustness under fault conditions in high‐voltage scenarios require further research.
Tai Yang, Xiangyu Zhang, Sihang Wu, Lei Qi, Xiang Cui   +4 more
wiley   +1 more source

Improved image reconstruction in coherent diffraction imaging using self‐seeded XFEL pulses

Journal of Synchrotron Radiation, EarlyView.
This study demonstrates that the superior coherence of narrow‐bandwidth self‐seeded X‐ray pulses significantly improves the quality and reliability of image reconstruction in coherent diffraction imaging compared with conventional broad‐bandwidth SASE pulses.
Jaeyong Shin, Junha Hwang, Sejin Kim, Sung Yun Lee, Eunyoung Park, Sangsoo Kim, Changyong Song, Daewoong Nam   +7 more
wiley   +1 more source

Shaped electrodes for adaptive X‐ray optics

Journal of Synchrotron Radiation, EarlyView.
For adaptive X‐ray optics on high‐performance beamline optical systems, we describe an approach to mirror figure and slope control using patterned, shaped electrodes to control the local curvature on a lithium niobate substrate from a single applied voltage. Longitudinally continuous electrode patterns achieve target shapes without discontinuities, and
Kenneth A. Goldberg, Francesco Marzari, Grant D. Cutler   +2 more
wiley   +1 more source

Air attenuation of high power XFEL beams

Journal of Synchrotron Radiation, EarlyView.
The transmission of air, which is used to contain X‐ray beams for radiation safety, is observed to significantly increase with X‐ray power.The Linac Coherent Light Source II, a high‐repetition‐rate X‐ray free‐electron laser (FEL), produces high average power as well as high peak power.
Philip Heimann, Andrew Rosenstrom, Ming-Fu Lin, Razib Obaid, Taran Driver, James Cryan, Shanjie Xiao, Sena MacDonald, Sayed Rokni, Alyssa Prinz, Willy Langeveld, Lin Zhang   +11 more
wiley   +1 more source

Corneal power modelling with OCT data – Thin and thick lens paraxial models versus raytracing

Acta Ophthalmologica, EarlyView.
Abstract Background Evaluating keratometric power with Zeiss index (PKZ), paraxial thick cornea power (Gullstrand [PG]) and power referenced to the front (PFV) and back vertex plane (PBV) and raytracing power (PR), and modelling the deviation from PKZ with a multivariable linear prediction model.
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Peter Hoffmann, Jascha Wendelstein   +4 more
wiley   +1 more source

A Compact Dual-Oblique-Fiber Heterodyne Phase-Shifting Point Diffraction Interferometer. [PDF]

Sensors (Basel)
Wang Y, Zhu C, Zhang W.
europepmc   +1 more source

Wavefront Refraction and Correction [PDF]

Optometry and Vision Science, 2014
Ray, Applegate, David, Atchison, Arthur, Bradley, Adrian, Bruce, Michael, Collins, Jason, Marsack, Scott, Read, Larry N, Thibos, Geunyoung, Yoon   +8 more
openaire   +2 more sources