Magnetically frustrated synthetic end member Mn2(PO4)OH in the triplite-triploidite family

The manganese end member of triplite-triploidite series of compounds, Mn2(PO4)OH, is synthesized by a hydrothermal method. Its crystal structure is refined in the space group P21/c with a = 12.411(1) Å, b = 13.323(1) Å, c = 10.014(1) Å, β = 108.16(1), V = 1573.3 Å3, Z = 8, and R = 0.0375. Evidenced in measurements of magnetization M and specific heat Cp, Mn2(PO4)OH reaches a long range antiferromagnetic order at TN = 4.6 K. As opposed to both triplite Mn2(PO4)F and triploidite-type Co2(PO4)F, the title compound is magnetically frustrated being characterized by the ratio of Curie-Weiss temperature Θ to Néel temperature TN of about 20. The large value of frustration strength Θ/TN stems from the twisted saw tooth chain geometry of corner sharing triangles of Mn polyhedra, which may be isolated within tubular fragments of a triploidite crystal structure. © 2017 The Royal Society of Chemistry.We thank E. V. Guseva for the X-ray spectral analysis of the sample and N. V. Zubkova for her help in the X-ray experiment. This work was supported by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST "MISiS" project K2-2016-066 and by RFBR projects 15-05-06742, 16-02-00021 and 17-02-00211. The work was supported by Act 211 Government of the Russian Federation, contracts 02.A03.21.0004, 02.A03.21.0006 and 02.A03.21.0011

Breaking of chalk fallen onto the floor

This problem was presented at the IPT 2022. The main goal was to find out What is the maximum height a piece of chalk might be dropped without breaking for a given surface, estimate parameters on which the height depends and suggest throwing techniques which minimize the breakage probabilit

Berry phases for the nonlocal Gross-Pitaevskii equation with a quadratic potential

A countable set of asymptotic space -- localized solutions is constructed by the complex germ method in the adiabatic approximation for the nonstationary Gross -- Pitaevskii equation with nonlocal nonlinearity and a quadratic potential. The asymptotic parameter is 1/T, where $T\gg1$ is the adiabatic evolution time. A generalization of the Berry phase of the linear Schr\"odinger equation is formulated for the Gross-Pitaevskii equation. For the solutions constructed, the Berry phases are found in explicit form.Comment: 13 pages, no figure

КЛИНИКО-ЭПИДЕМИОЛОГИЧЕСКИЕ ОСОБЕННОСТИ ГРУППОВОЙ ЗАБОЛЕВАЕМОСТИ ЭНТЕРОВИРУСНОЙ ИНФЕКЦИЕЙ КОКСАКИ А 16 У ДЕТЕЙ

Federal Service on Customers' Rights Protection and Human Well-Being Surveillance in Orenburg Region, Orenburg The authors presented the results of the clinical and epidemiological analysis of enterovirus coxsackievirus A-16 group morbidity among kindergarten children in the Orenburg region occurring in the form of the syndrome of ≪hand-foot-mouth≫ with exantem. 20 children were involved in the epidemic process, 72,2% of the children are 1—2 years old, they became a source of infection to other groups of children. The disease had a mild course and did not require special treatment.Представлены результаты клинико-эпидемиологического анализа групповой заболеваемости детей детского сада Оренбургской области энтеровирусной инфекцией Коксаки А16, протекавшей с экзантемой в виде синдрома «рука-нога-рот». В эпидемический процесс было вовлечено 20 детей, из них 72,2% детей 1—2 лет, ставших источниками распространения инфекции в другие группы детей. Заболевание имело легкое течение и не требовало специального лечения

The of method of xenon therapies in obstetrics

The purpose of work: to prove application of a method of xenon’s therapy for treatment of stress at women in during labors. Research is executed on 10 healthy volunteers - 10 women. Subsequently, after the informed consent, sessions xenon’s therapies have been executed at 11 first labor women before labors with the purpose preventive of labor’s stress, the group of the control has made 10 women. The control of gas structure of a respiratory mix was carried out by means of gas analyzer GKM-03-«INSOVT». Diagnostics of stress and adaptable reactions was spent on parameters of leukocytes formulas. Studying of jet and personal alarm was carried out by means of psychological CH.D.Spielberg's techniques - by JU.L.Khanin. Researches were carried out up to labor before procedure of xenon’s therapy and day after labor. The received results testify that procedure of xenon therapies by duration till 3 minutes is safe, the maintenance of oxygen in an inhaled mix does not fall below 21 %, and xenon’s inhalations possess antistressor effect and can be used for preventive of labor stress at women.Цель исследования: обосновать применение метода терапии ксеноном для лечения стресса у женщин в родах. Первоначально исследование было проведено на 10 женщинах-добровольцах в отделении гинекологии в день оперативного вмешательства. В дальнейшем с целью профилактики родового стресса, после информированного согласия, перед родами были проведены сеансы кислородно-ксеноновой смесью у 11 беременных первородящих женщин. Контрольная группа первородящих женщин включала 10 человек. Контроль газового состава дыхательной смеси осуществлялся с помощью газоанализатора ГКМ-ОЗ-ИНСОВТ. Диагностика стресса и адаптационных реакций проводилась по показателям лейкоцитарной формулы. Изучение реактивной и личностной тревоги осуществлялось с помощью психодиагностической методики Ч.Д. Спилберга - Ю.Л. Ханина. Исследования выполнялись до родов перед процедурой терапии ксеноном и через сутки после родов. Полученные результаты свидетельствуют о том, что процедура ксеноновой терапии длительностью до Зх минут является безопасной, т.к. содержание кислорода во вдыхаемой смеси не опускается ниже 21%, а сами ксеноновые ингаляции обладают антистрессорным эффектом и могут быть использованы для профилактики родового стресса беременных женщин

CLINICAL EPIDEMIOLOGICAL PECULIARITIES OF ENTEROVIRUS COXSACKIEVIRUS A16 GROUP MORBIDITY IN CHILDREN

Federal Service on Customers' Rights Protection and Human Well-Being Surveillance in Orenburg Region, Orenburg The authors presented the results of the clinical and epidemiological analysis of enterovirus coxsackievirus A-16 group morbidity among kindergarten children in the Orenburg region occurring in the form of the syndrome of ≪hand-foot-mouth≫ with exantem. 20 children were involved in the epidemic process, 72,2% of the children are 1—2 years old, they became a source of infection to other groups of children. The disease had a mild course and did not require special treatment