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The line-spread function is directly proportional to the vertical integration of the point-spread image. The optical-transfer function (OTF) is defined as the Fourier transform of the point-spread function and is thus generally a two-dimensional complex function. Typically only a one-dimensional slice is shown (c), corresponding to the Fourier ...
The green point is a charge q lying inside the sphere at a distance p from the origin, the red point is the image of that point, having charge −qR/p, lying outside the sphere at a distance of R 2 /p from the origin. The potential produced by the two charges is zero on the surface of the sphere.
A point source as imaged by a system with negative (top), zero (center), and positive (bottom) spherical aberration. Images to the left are defocused toward the inside, images on the right toward the outside. The point spread function ( PSF) describes the response of a focused optical imaging system to a point source or point object.
An Axios/Ipsos poll found that 1 in 5 Americans don’t think they’ll ever retire — and a whopping 70% of that cohort say it’s because they simply can’t (or won’t be able to) afford it.
A point particle, ideal particle [1] or point-like particle (often spelled pointlike particle) is an idealization of particles heavily used in physics. Its defining feature is that it lacks spatial extension; being dimensionless, it does not take up space. [2] A point particle is an appropriate representation of any object whenever its size ...
want, won't and wont. Want means the act of desiring or wishing for something. Won't is a contraction for "will not", while wont is a word meaning "accustomed" or "inclined to" (as an adjective) or "habit or custom" (as a noun). Standard: He won't let me drive his car. Standard: He spent the morning reading, as he was wont to do.
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Frequency-hopping spread spectrum ( FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver. FHSS is used to avoid interference, to prevent eavesdropping, and to enable code ...