In this paper, a new structure of photonic crystal fibers (PCFs) with large negative dispersion is presented in order to compensate the positive at wavelength 1.55 μm. The proposed PCF has square lattice structure. basic cladding, it consists four rings, so that each ring number circular holes. final structure, two inner rings cladding are reshaped relative outer rings. first near core stellar ...

The goal of this research was to determine when harbor seal pup vocalizations become sufficiently distinctive to allow individual recognition. A total of 4593 calls were analyzed from 15 captive pups. Nineteen were harsh, broadband, staccato calls used in an aggressive context. The rest were tonal "mother attraction calls," having an inverted "v"- or "u"-shaped spectrogram with harmonics and a ...

The point of departure for the project “Preventing stress in knowledge work” is the realisation that in order to work on preventing stress amongst ‘knowledge workers’, a new understanding of the concept of stress and knowledge work is required. This paper explores how stress and associated mechanisms for coping in knowledge work can be understood both in terms of ambiguity, continuous identity ...

The results of immunogenetic monitoring from 1986 to 2020 the lines Anis 4593 ZSV – 236 (n = 287), Liker 5412 ZSV-585 263), and Toreador 3032 ZS-485 627) breed Sychevka cattle in Smolensk region, using red blood cell antigenic factors EAB locus groups as genetic markers are presented. As a result line crosses carried out, well introduction genes Red-and-White Holstein breed, an expansion divers...