Structural and optical properties of vacuum-deposited ZnS nanostructures

In this paper some structural, substructural and optical proper- ties of zinc sulfide nanostructures obtained by a CSVS method on bulk ZnSe are investigated. Examination of optical and substructural properties was performed by infrared spectro- scopy and X-ray diffraction, respectively. The results of these studies enabled determination of the dependence of the main structural film parameters (texture, lattice parameters, grain and X-ray scattering domain sizes, and microstrain) on the growth conditions. IR-spectral distributions of transmission coefficient T(n) for bilayered ZnS/ZnSe nanostructures are obtained. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3323

Brown bear attacks on humans : a worldwide perspective

The increasing trend of large carnivore attacks on humans not only raises human safety concerns but may also undermine large carnivore conservation efforts. Although rare, attacks by brown bears Ursus arctos are also on the rise and, although several studies have addressed this issue at local scales, information is lacking on a worldwide scale. Here, we investigated brown bear attacks (n = 664) on humans between 2000 and 2015 across most of the range inhabited by the species: North America (n = 183), Europe (n = 291), and East (n = 190). When the attacks occurred, half of the people were engaged in leisure activities and the main scenario was an encounter with a female with cubs. Attacks have increased significantly over time and were more frequent at high bear and low human population densities. There was no significant difference in the number of attacks between continents or between countries with different hunting practices. Understanding global patterns of bear attacks can help reduce dangerous encounters and, consequently, is crucial for informing wildlife managers and the public about appropriate measures to reduce this kind of conflicts in bear country.Peer reviewe

Growth kinetics and stoichiometry of ZnS films obtained by close-spaced vacuum sublimation technique

Surface roughness, stoichiometry, deposition rates and activation energy of different growth mechanisms of zinc sulfide films are investigated. The films were deposited onto glass-ceramic substrates by close-spaced vacuum sublimation technique (CSVS) at different deposition temperatures. Rutherford backscattering spectroscopy (RBS) using helium ions with 1.8 MeV energy and EDAX method were applied for determination of film thickness and stoichiometry. The effect of the deposition temperature on film properties has been studied