Results 231 to 240 of about 339,455 (292)

Ultrastructural Analysis of <i>Pseudanthus</i> (Picrodendraceae) Pollen Using Transmission Electron Microscopy: Intraspecific, Interspecific, Intrafamilial, and Interfamilial Comparisons. [PDF]

Plants (Basel)
Till A, Ulrich S, Cantrill DJ, Grímsson F.   +3 more
europepmc   +1 more source

Nature inspired design methodology for a wide field of view achromatic metalens. [PDF]

Nanophotonics
Engelberg J, Mazurski R, Levy U.
europepmc   +1 more source

Design and performances of a compact differential pumping unit for X-ray beamlines. [PDF]

J Synchrotron Radiat
Maccarrone C, Buisson AL, Cammarata M.
europepmc   +1 more source

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Apodization of annular apertures: Strehl ratio

Applied Optics, 1988
We show that for any rotationally symmetric apodizer on the full aperture, there is a family of apodizers on the annular aperture with the same functional Strehl ratio vs defocus (W(20)) and vs spherical aberration (W(40)). However, in the latter case, the coefficients W(20) and W(40) are reduced by the factors (1 - epsilon(2)) and (1 - epsilon(2))(2 ...
J, Ojeda-Castaneda, E, Tepichin, A, Pons
openaire   +2 more sources

Aperture intensity ratio fiber-optic displacement sensor

Review of Scientific Instruments, 1987
A displacement sensor based on the ratio of fiber-optic light emitted from two fixed position optical fibers into a third, movable fiber connected to a photodetector is described. Square-wave modulated light of opposite phases produces a corresponding square wave at the detector which has zero ac amplitude at the center position and an amplitude ...
Darold Wobschall, Shahram Hejazi
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Signal-to-noise ratio of Singer product apertures

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2017
Abstract Formulae for the signal-to-noise ratio (SNR) of Singer product apertures are derived, allowing optimal Singer product apertures to be identified, and the CPU time required to decode them is quantified. This allows a systematic comparison to be made of the performance of Singer product apertures against both conventionally wrapped Singer ...
Paul M.E. Shutler, Kevin Byard
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Signal-to-noise ratio in coded aperture imaging

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2012
Abstract We present a derivation of the signal-to-noise ratio (SNR) of a cyclic difference set (CDS) based coded mask which is simpler than that given in the literature, and which applies to any distribution of flux against the mask, not just Poisson statistics as is currently the case.
Paul M.E. Shutler, Alireza Talebitaher, Stuart V. Springham   +2 more
openaire   +1 more source