Variation on a Zernike wavefront sensor theme: Optimal use of photons

Variation around a pyramid theme: optical recombination and optimal use of photons.

We propose a new type of wave-front sensor (WFS) derived from the pyramid WFS (PWFS). This new WFS, called the flattened pyramid-WFS (FPWFS), has a reduced pyramid angle in order to optically overlap the four pupil images into an unique intensity. This map is then used to derive the phase information. In this Letter, this new WFS is compared to three existing WFSs, namely the PWFS, the modulate...

Zernike vs. Zonal Matrix Iterative Wavefront Reconstructor

Variation on a theme of Schütte

Let ≺ be a primitive recursive well-ordering on the natural numbers and assume that its order-type is greater than or equal to the prooftheoretic ordinal of the theory T. We show that the proof-theoretic strength of T is not increased if we add the negation of the statement which formalizes transfinite induction along ≺.

One Variation on Lloyd's Theme

One random spin2 XY chain that after Jordan-Wigner fermionization reduces to the extended Lloyd’s model is considered. The random-averaged one-fermion Green functions have been calculated exactly that yields thermodynamics of the spin model. PACS codes: 75.10.-b

Disciplinary Variation in the Use of Theme in Undergraduate Essays

Success in higher education depends on students’ ability to meet the writing requirements of their chosen courses, and in many cases this involves adapting to the literacy practices of particular disciplines. While research into professional academic discourse suggests that it may reflect differences in disciplinary culture and epistemology, there has been relatively little investigation of dis...