At the Venezuela National Astronomical Observatory we are carrying out variability surveys spanning many hundreds of square degrees near the celestial equator, using an 8k x 8k CCD Mosaic Camera optimized for drift-scanning on a 1m Schmidt telescope. Among the initial efforts was a project to obtain the first moderately deep, homogeneous sample of young stars over an area of ∼ 180sqr.deg. encom...

Arithmetic of K3 surfaces defined over finite fields is investigated. In particular, we show that any K3 surface X of finite height over a finite field k of characteristic p ≥ 5 has a quasi-canonical lifting Z to characteristic 0, and that for any such Z, the endormorphism algebra of the transcendental cycles V (Z), as a Hodge module, is a CM field over Q. The Tate conjecture for the product of...

Perceptual video quality considerably affects the of experience (QoE) watching television (TV) broadcasts. Viewing conditions, such as screen size and viewing distance, impact perceived quality. We performed subjective evaluation experiments on 8K (7,680×4,320) ultra-high definition (UHD) compressed videos under seven conditions (combinations 31.5-, 55-, 85-inch displays 0.75, 1.5, 3.0 H (times...

In this paper we find all the integer points on elliptic curves induced by the Diophantine triples {k − 1, k + 1, 16k − 4k} and {k − 1, k + 1, 64k− 48k + 8k} that have either rank two or 2 ≤ k ≤ 10000 (with one possible exception).

By studying modular invariance properties of some characteristic forms, we obtain twisted anomaly cancellation formulas. We apply these twisted cancellation formulas to study divisibilities on spin manifolds and congruences on spinc manifolds. Especially, we get twisted Rokhlin congruences for 8k + 4 dimensional spinc manifolds.

An overlap method for regularizing Majorana–Weyl fermions interacting with gauge fields is presented. A mod(2) index is introduced in relation to the anomalous violation of a discrete global chiral symmetry. Most of the paper is restricted to 2 dimensions but generalizations to 2+8k dimensions should be straightforward.

"!$# &%' (# ) * !+ !, )# . / ) 0 1) 2! 3 ( 45 ( 16 7 ) 8 9 ) ):<;=# ( > ) (# )?/@ ) 2! A )% . B BC D ! %E ' FB ) G# ( )BH IJ%' (# ) ) 3 BK %L 8K!$ M >B )-$ ) !$ BN F !$%O M%L P# & -$ 9# !$ %' Q !PB!$ > Y -S 6 8$ Y ) )1) Y (1)! )?

K-shell fluorescence yields of low, medium Z and rare earth elements were determined using Si(PIN) detector and HPGe detector employing reflection geometry set up. Target atoms were excited using 59.5 keV gamma rays emerging from Am-241 source of strength 300 mCi. Background radiation and multiple scattering effects were minimized by properly shielding the detector. The elemental foils of unifo...

With the growing data consumption of emerging video applications and users&#x2019; requirement for higher resolutions, up to 8K, a huge effort has been made in compression technologies. Recently, versatile coding (VVC) standardized by moving picture expert group (MPEG), providing significant improvement performance over its predecessor high efficiency (HEVC). In this paper, we provide comparati...