Utilization of ferrous-magnesium slag for production of binding materials

Utilization of Pechenganickel, Severonickel and Norilsk Nickel smelter plants ferrous-magnesium slag for production of Portland slag cement, lime-slag cement and alkali-activated slag cement has been considered. Influence of mechanical activation of ferrous-magnesium slag, in air and in carbon dioxide atmosphere, on its binding properties has been studied. It has been shown that preliminary mechanical activation in CO2 results in an increase of compressive strength of alkali-activated slag cement. Interaction between mechanically activated slag and liquid glass has been characterized using SEM and microprobe technique

Experimental study of the vidicon system for information recording using the wide-gap spark chamber of gamma - telescope gamma-I

The development of the gamma ray telescope is investigated. The wide gap spark chambers, used to identify the gamma quanta and to determine the directions of their arrival, are examined. Two systems of information recording with the spark chambers photographic and vidicon system are compared

Pulse area theorem in a single mode waveguide and its application to photon echo and optical memory in Tm3+:Y3Al5O12

We derive the area theorem for light pulses interacting with inhomogeneously broadened ensemble of two-level atoms in a single-mode optical waveguide and present its analytical solution for Gaussian-type modes, which demonstrates the significant difference from the formation of $2\pi$ pulses by plane waves. We generalize this theorem to the description of photon echo and apply it to the two-pulse (primary) echo and the revival of silenced echo (ROSE) protocol of photon echo quantum memory. For the first time, we implemented ROSE protocol in a single-mode laser-written waveguide made of an optically thin crystal $Tm^{3+}:Y_3Al_5O_{12}$. The experimental data obtained are satisfactorily explained by the developed theory. Finally, we discuss the obtained experimental results and possible applications of the derived pulse area approach

The gamma-ray telescope Gamma-1

French and Soviet specialists have designed and built the gamma-ray telescope GAMMA-1 to detect cosmic gamma rays above 50 MeV. The sensitive area of the detector is 1400 sq cm, energy resolution is 30% at 300 MeV, and angular resolution 1.2 deg at 300 MeV (and less than 20' arc when a coded aperture mask is used). Results on calibration of the qualification model and Monte-Carlo calculations are presented

Antiproton collisions with excited positronium

We present results of calculations of several processes resulting from positronium (Ps) collisions with antiprotons: antihydrogen formation, Ps breakup, and nPs-changing collisions. Calculations utilize the quantum convergent close-coupling (CCC) method and the classical trajectory Monte Carlo (CTMC) method. We identify a region of Ps principal quantum numbers nPs and Ps energies where the classical description is valid and where the CCC calculations become computationally too expensive. This allows us to present the most complete and reliable set of cross sections in a broad range of nPs and initial orbital momentum quantum numbers lPs which are necessary for experiments with antihydrogen at CERN

Синдром беспокойных ног: патогенез, диагностика, лечение. Обзор литературы

Restless leg syndrome (RLS) is a chronic sensory‑motor disorder characterized by sensory discomfort in legs, appearing or worsening during rest in the evening or night time, evoking the urge to move. Despite its wide prevalence (around 5−10% in the population) and essential influence on the quality of life, not all the physicians, specialists of the primary care and even neurologists are common with this disorder. Because of that RLS stays commonly unrecognized.Синдром беспокойных ног является хроническим сенсомоторным расстройством, которое подразумевает сенсорный дискомфорт в ногах или других частях тела, возникающий или усиливающийся в покое, в вечернее/ночное время, и вызывающий потребность в движении. Несмотря на широкую распространенность (около 5−10 % в популяции) и значимое влияние на качество жизни, врачи общей практики, специалисты первого звена и сами неврологи недостаточно осведомлены о данном заболевании, в связи с чем оно часто остается ошибочно диагностируемым состоянием

Stochastic Chemical Kinetics with Energy Parameters

International audienceAbstact: We introduce new models of energy redistribution in stochastic chemical kinetics with several molecule types and energy parameters. The main results concern the situations when there are product form measures. Using a probabilistic interpretation of the related Boltzmann equation, we find some invariant measures explicitly and prove convergence to them.Résumé : Nous introduisons de nouveaux modèles de réseaus de cinétique chimique, avec plusieurs types de molécules et de redistribution d'énergie. Les principaux résultats concernent les cas où les mesures invariantes ont une forme produit. Grâce à une interprétation probabiliste, certaines de ces mesures sont calculées explicitement et on montre qu'elles sont effectivement atteintes par convergence