Results 51 to 60 of about 5,609,446 (239)

Variable light source with a million-to-one intensity ratio [PDF]

, 1964
A wide range, variable intensity light source of constant color characteristics has been developed for testing and calibrating photomultiplier tubes.
Snow, W. B.
core   +1 more source

High-energy photoemission final states beyond the free-electron approximation

Nature Communications, 2023
Three-dimensional (3D) electronic band structure is fundamental for understanding a vast diversity of physical phenomena in solid-state systems, including topological phases, interlayer interactions in van der Waals materials, dimensionality-driven phase
V. N. Strocov, L. L. Lev, F. Alarab, P. Constantinou, X. Wang, T. Schmitt, T. J. Z. Stock, L. Nicolaï, J. Očenášek, J. Minár   +9 more
doaj   +1 more source

Absolute Calibration of the Auger Fluorescence Detectors [PDF]

, 2005
Absolute calibration of the Pierre Auger Observatory fluorescence detectors uses a light source at the telescope aperture. The technique accounts for the ombined effects of all detector components in a single measurement.
A C Rovero, A C Rovero, A Tamashiro, D Warner, J Brack, J Harton, L Garrard, P Bauleo, R Knapik, R Meyhandan   +9 more
core   +1 more source

High-speed X-ray ptychographic tomography

Scientific Reports, 2022
X-ray ptychography is a coherent scanning imaging technique widely used at synchrotron facilities for producing quantitative phase images beyond the resolution limit of conventional x-ray optics.
Darren Batey, Christoph Rau, Silvia Cipiccia   +2 more
doaj   +1 more source

System for the measurement of ultra-low stray light levels [PDF]

, 1978
An apparatus is described for measuring the effectiveness of stray light suppression light shields and baffle arrangements used in optical space experiments and large space telescopes.
Brealt, R. P., Fannin, B. B., Griner, D. B., Hawkins, C. A., Hunt, G. H., Hurd, W. A., Shelton, G. B., Wyman, C. L.   +7 more
core   +1 more source

Quantum reading under a local energy constraint

, 2012
Nonclassical states of light play a central role in many quantum information protocols. Their quantum features have been exploited to improve the readout of information from digital memories, modelled as arrays of microscopic beam splitters [S. Pirandola,
A. Ferraro, C. W. Helstrom, Cosmo Lupo, Gaetana Spedalieri, M. A. Nielsen, S. Guha, S. L. Braunstein, Samuel L. Braunstein, Stefano Mancini, Stefano Pirandola, T. M. Cover   +10 more
core   +1 more source

Limited-angle x-ray nano-tomography with machine-learning enabled iterative reconstruction engine

npj Computational Materials
A long-standing challenge in tomography is the ‘missing wedge’ problem, which arises when the acquisition of projection images within a certain angular range is restricted due to geometrical constraints.
Chonghang Zhao, Mingyuan Ge, Xiaogang Yang, Yong S. Chu, Hanfei Yan   +4 more
doaj   +1 more source

Determination of Angle of Refraction in X-Ray Phase-Contrast Imaging Using Geometric Optics Method

Photonics
The accurate calculation of the angle of refraction of X-rays passing through an object is essential in X-ray phase-contrast imaging. While the wave optics-based method is commonly employed to calculate the angle of refraction, it presents several ...
Jun Yang, Fangke Zong, Haoqi Tang, Yang Du, Rongchang Chen   +4 more
doaj   +1 more source

Climbing Mountains: Building a Data Capture and Correction System for JUNGFRAU 9M [PDF]

Structural Dynamics
The JUNGFRAU detector is a charge integrating, high-frame-rate, imaging detector developed by the PSI detector group, originally to support the SwissFEL Aramis beamline.
Graeme Winter, Nick E Devenish, James O'Hea, Gary Yendell   +3 more
doaj   +1 more source

A narrow-band speckle-free light source via random Raman lasing

, 2015
Currently, no light source exists which is both narrow-band and speckle-free with sufficient brightness for full-field imaging applications. Light emitting diodes (LEDs) are excellent spatially incoherent sources, but are tens of nanometers broad. Lasers
Bixler, Joel N., Cao, Hui, Dyer, Phillip N., Hokr, Brett H., Noojin, Gary D., Redding, Brandon, Rockwell, Benjamin A., Schmidt, Morgan S., Scully, Marlan O., Thomas, Robert J., Yakovlev, Vladislav V.   +10 more
core   +1 more source