A technology of drinking water decontamination from radon and its decay products

Underground water is one of the main sources of radon for households. This article focuses on the estimation and removal of radon from underground water using the technology and inorganic sorbents developed by EKSORB Ltd., Russia for liquid radioactive waste treatment in the nuclear power industry. The article presents the results of tests of a system for the removal of radon and radon daughters from water patented by EKSORB. This is achieved by filtering water through RATZIR sorbent, followed by periodic load regeneration. Over a period of three years, the plant is successful in removing radon from the water that had an initial radon content of approximately 1500 Bq/L to less than 60 Bq/L, without releasing radon to indoor/outdoor air. © 2020 Igor Voinov et al., published by Sciendo 2020

Spectroscopic Study of Arc Temperature Profiles of a Switching-off Process in a Model Chamber

A model chamber was applied to emulate a switching-off process which is very similar to those in real high-voltage circuit-breakers. The arc between moved W-Cu electrodes through a PTFE nozzle in SF6 was considered. Transparent windows in the chamber wall and a slit in the nozzle enabled an optical in-vestigation of the arc cross section several milliseconds before current zero. The side-on radiance of fluo-rine atom lines has been measured. Considering rotational symmetry of the arc the corresponding radial emission coefficients have been determined. Radial temperature profiles have been obtained with uncer-tainties below 10% considering change of window transmission and optical depth of the line radiation. The experimentally determined temperature profiles are used to validate a CFD simulation of the switch-ing-off process in the model chamber

Investigation of a Multi-Chamber System for Lightning Protection at Overhead Power Lines

A multi-chamber system with composite electrodes fitted into silicone rubber has been recently proposed for lightning protection of power lines. The arc extinction during a current pulse in the arc chamber has been studied. Optical emission spectroscopy and high speed imaging used in experiments allowed to es-timate plasma temperature and velocity of the jet. Erosion coefficients for electrode materials were esti-mated. Investigations of different materials of the arc chamber were carried out

Interaction of a free burning arc with regenerative protective layers

The possible use of protective layers made of ceramic powders for walls in thermal plasma applications is studied. A stable free burning arc of currents up to 5 kA between copper- tungsten electrodes is used to analyse the arc interaction with samples coated by mixtures of CaCO3, MgCO3, and Mg(OH)2 with plaster. By means of optical emission spectroscopy the maximum arc temperature and the radiation impact on the surfaces are estimated to be around 15000 K and 20 MWm-2, respectively. Thermographic measurements confirm the efficient protection of substrates by all layer materials. Layers containing CaCO3 lead to the lowest heating of ceramic samples which may be caused by a strong evaporation of the layer material

Blood parameters in dermatitis of various etiologies in cattle

The purpose of the research is to identify a general pattern in the change in hematological and biochemical parameters in any lesions of cattle skin.Materials and methods. The work was carried out in October-November 2021 in the conditions of farms in the Ipatovsky district of the Stavropol Territory on cattle aged 9–12 months and 90–120 kg of body weight. During the veterinary clinical examination, four groups of fve heads each were formed, one of the groups was a control. Animals of the control group had no clinical signs of dermatitis. The experimental groups of animals were divided depending on the degree of intensity of skin lesions into mild, moderate and generalized forms of manifestation of dermatitis. The results obtained were processed statistically.Results and discussion. A veterinary clinical examination of this livestock made it possible to establish the dependence in case of damage to the skin not only in changes in temperature, respiratory rate and pulse, but also in blood parameters. The body temperature of calves with a generalized form of dermatitis increased by an average of 0.5 degrees, breathing increased by six units per minute, the pulse rate increased by 15–18 beats per minute. In calves with mild and moderate manifestation of dermatitis, these parameters did not have signifcant changes and were within the normal range. From hematological indicators, hemoglobin had a general tendency to decrease with increasing intensity of the lesion or aggravation of the pathological process. Such indicators as ESR, leukocytes, neutrophils, eosinophils, on the contrary, tended to increase, especially in the generalized form. The slowdown of erythropoiesis and thrombocytopenia in the generalized form of dermatitis is presumably associated with intoxication of the body of calves. An increase in ESR, the number of eosinophils indicates an inflammatory process occurring in the animal's body. From biochemical indicators, an increase in the level of bilirubin, AST and ALT, creatinine, alkaline phosphatase indicates toxic liver damage due to intoxication of the body of calves due to inflammatory factors and decay products of affected skin cells

First πK\pi K atom lifetime and πK\pi K scattering length measurements

The results of a search for hydrogen-like atoms consisting of $\pi^{\mp}K^{\pm}$ mesons are presented. Evidence for $\pi K$ atom production by 24 GeV/c protons from CERN PS interacting with a nickel target has been seen in terms of characteristic $\pi K$ pairs from their breakup in the same target ($178 \pm 49$) and from Coulomb final state interaction ($653 \pm 42$). Using these results the analysis yields a first value for the $\pi K$ atom lifetime of $\tau=(2.5_{-1.8}^{+3.0})$ fs and a first model-independent measurement of the S-wave isospin-odd $\pi K$ scattering length $\left|a_0^-\right|=\frac{1}{3}\left|a_{1/2}-a_{3/2}\right|= \left(0.11_{-0.04}^{+0.09} \right)M_{\pi}^{-1}$ ($a_I$ for isospin $I$).Comment: 14 pages, 8 figure

New data on OZI rule violation in bar{p}p annihilation at rest

The results of a measurement of the ratio R = Y(phi pi+ pi-) / Y(omega pi+ pi-) for antiproton annihilation at rest in a gaseous and in a liquid hydrogen target are presented. It was found that the value of this ratio increases with the decreasing of the dipion mass, which demonstrates the difference in the phi and omega production mechanisms. An indication on the momentum transfer dependence of the apparent OZI rule violation for phi production from the 3S1 initial state was found.Comment: 11 pages, 3 PostScript figures, submitted to Physics Letter

Determination of ππ\pi\pi scattering lengths from measurement of π+π−\pi^+\pi^- atom lifetime

The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory.Comment: 6 pages, 6 figure

Показатели крови при дерматитах различной этиологии у крупного рогатого скота

The purpose of the research is to identify a general pattern in the change in hematological and biochemical parameters in any lesions of cattle skin.Materials and methods. The work was carried out in October-November 2021 in the conditions of farms in the Ipatovsky district of the Stavropol Territory on cattle aged 9–12 months and 90–120 kg of body weight. During the veterinary clinical examination, four groups of fve heads each were formed, one of the groups was a control. Animals of the control group had no clinical signs of dermatitis. The experimental groups of animals were divided depending on the degree of intensity of skin lesions into mild, moderate and generalized forms of manifestation of dermatitis. The results obtained were processed statistically.Results and discussion. A veterinary clinical examination of this livestock made it possible to establish the dependence in case of damage to the skin not only in changes in temperature, respiratory rate and pulse, but also in blood parameters. The body temperature of calves with a generalized form of dermatitis increased by an average of 0.5 degrees, breathing increased by six units per minute, the pulse rate increased by 15–18 beats per minute. In calves with mild and moderate manifestation of dermatitis, these parameters did not have signifcant changes and were within the normal range. From hematological indicators, hemoglobin had a general tendency to decrease with increasing intensity of the lesion or aggravation of the pathological process. Such indicators as ESR, leukocytes, neutrophils, eosinophils, on the contrary, tended to increase, especially in the generalized form. The slowdown of erythropoiesis and thrombocytopenia in the generalized form of dermatitis is presumably associated with intoxication of the body of calves. An increase in ESR, the number of eosinophils indicates an inflammatory process occurring in the animal's body. From biochemical indicators, an increase in the level of bilirubin, AST and ALT, creatinine, alkaline phosphatase indicates toxic liver damage due to intoxication of the body of calves due to inflammatory factors and decay products of affected skin cells.Цель исследований – выявление общей закономерности в изменении гематологических и биохимических показателей при любых поражениях кожного покрова крупного рогатого скота.Материалы и методы. Работа проведена в октября-ноябре 2021 г. в условиях хозяйств Ипатовского района Ставропольского края на крупном рогатом скоте в возрасте 9–12 мес. массой тела 90–120 кг. В ходе ветеринарно-клинического обследования были сформированы четыре группы по пять голов в каждой, одна из групп была контрольной. Животные контрольной группы не имели клинических признаков дерматитов. Опытные группы животных были разделены в зависимости степени интенсивности поражения кожи на слабую, среднюю и генерализованную формы проявления дерматитов. Полученные результаты обработаны статистически.Результаты и обсуждение. Ветеринарно-клинический осмотр данного поголовья позволил установить зависимость при поражении кожного покрова не только в изменениях показателей температуры, частоты дыхания и пульса, но и показателей крови. Температура тела у телят с генерализованной формой дерматита повышалась в среднем на 0,5 градуса, дыхание учащалось на шесть единиц в минуту, частота пульса возрастала на 15–18 ударов в минуту. У телят со слабым и средним проявлением дерматита данные показатели не имели значимых изменений и находились в пределах нормы. Из гематологических показателей, гемоглобин имел общую тенденцию к снижению с ростом интенсивности поражения или усугубления патологического процесса. Такие показатели как СОЭ, лейкоциты, нейтрофилы, эозинофилы, наоборот, имели тенденцию к увеличению, особенно при генерализованной форме. Замедление эритропоэза и тромбоцитопении при генерализованной форме дерматита предположительно связаны с интоксикацией организма телят. Повышение СОЭ, числа эозинофилов свидетельствует о воспалительном процессе, происходящем в организме животного. Из биохимических показателей, повышение уровня билирубина, АСТ и АЛТ, креатинина, щелочной фосфатазы свидетельствует о токсическом поражении печени вследствие интоксикации организма телят за счет воспалительных факторов и продуктов распада пораженных клеток кожи