The giant magnetoresistance (GMR) of ferromagnetic bilayers with a superconducting contact (F1/F2/S) is calculated in ballistic and diffusive regimes. As in spin-valve, it is assumed that the magnetization in the two ferromagnetic layers F1 and F2 can be changed from parallel to antiparallel. It is shown that the GMR defined as the change of conductance between the two magnetic configurations i...

We calculate partial widths of the γγ decay of the tensor qq̄ states a2(1320), f2(1270), f2(1525), their radial excitations a2(1660), f2(1640), f2(1800) as well as F2qq̄ states. Calculations are performed in the framework of the same approach which was used before for the study of radiative decays f0(980) → γγ, a0(980) → γγ and φ(1020) → γf0(980): the assumption made is that of qq̄ structure of f0...

The chemistry of F2 and its derivatives are amenable to facile aliphatic or aromatic substitution, as well as electrophilic addition. The main limitation in the use of [18 F]F2 for radiopharmaceutical synthesis is the low specific activity achieved by the traditional methods of production. The highest specific activities, 55 GBq/μmol, for [18 F]F2 have been achieved so far by using electrical d...

A perfect polynomial over F2 is a polynomial A ∈ F2[x] that equals the sum of all its divisors. If gcd(A, x + x) = 1 then we say that A is odd. In this paper we show the non-existence of odd perfect polynomials with either three prime divisors or with at most nine prime divisors provided that all exponents are equal to 2.

Let V be an n-dimensional vector space over the finite field Fq, and [Vk] denote family of all k-dimensional subspaces V. The families F1⊆[Vk1],F2⊆[Vk2],…,Fr⊆[Vkr] are said to r-cross t-intersecting if dim⁡(F1∩F2∩⋯∩Fr)≥t for Fi∈Fi,1≤i≤r. F1, F2,…,Fr non-trivial dim⁡(∩1≤i≤r∩F∈FiF)<t. In this paper, we first determine structure with maximum product their sizes. As a consequence, partially prove o...

We described a method for long-term passive measurements of unattached fraction fp of the potential alpha energy concentration of radon progeny from a set of measured (f1, f2, f3) values, where fi=Ci/C0 (i=1, 2, 3), and C0, C1, C2 and C3 were the concentrations of 222Rn, and the airborne concentrations of 218Po, 214Pb and 214Bi, respectively. Jacobi room model parameters were randomly sampled f...