Degradation and reuse of radiative thermal protection system materials for the space shuttle

Three silicide coated columbium alloys and two cobalt alloys were subjected to identical simulated reentry profiling exposures in both static (controlled vacuum leak) and dynamic (hypersonic plasma shear) environments. Primary emphasis in the columbium alloy evaluation was on the Cb752 and C129Y alloys with a lesser amount on FS85. Commercial silicide coatings of the R512E and VH109 formulations were used. The coated specimens were intentionally defected to provide the types of coating flaws that are expected in service. Temperatures were profiled up to peak temperatures of either 2350 F or 2500 F for 15 minutes in each cycle

Variability in high-mass X-ray binaries

Strongly magnetized, accreting neutron stars show periodic and aperiodic variability over a wide range of time scales. By obtaining spectral and timing information on these different time scales, we can have a closer look into the physics of accretion close to the neutron star and the properties of the accreted material. One of the most prominent time scales is the strong pulsation, i.e., the rotation period of the neutron star itself. Over one rotation, our view of the accretion column and the X-ray producing region changes significantly. This allows us to sample different physical conditions within the column but at the same time requires that we have viewing-angle-resolved models to properly describe them. In wind-fed high-mass X-ray binaries, the main source of aperiodic variability is the clumpy stellar wind, which leads to changes in the accretion rate (i.e., luminosity) as well as absorption column. This variability allows us to study the behavior of the accretion column as a function of luminosity, as well as to investigate the structure and physical properties of the wind, which we can compare to winds in isolated stars.Comment: 6 pages, 4 figures, accepted for publication in Astronomische Nachrichten (proceedings of the XMM-Newton Workshop 2019

Avaliação do comportamento de estacas de Thitonia diversifolia (Hemsley) Gray em sistema agroflorestal na Encosta da Serra do Sudeste, RS.

O objetivo deste trabalho foi avaliar a sobrevivência e produção de biomassa de estacas com diferentes diâmetros de Thitonia diversifolia em condições de campo, fornecendo dados capazes de orientarem a utilização desta planta em sistemas Agroflorestais na região da Encosta da Serra do Sudeste, Rio Grande do Sul

Vela X-1 as a laboratory for accretion in High-Mass X-ray Binaries

Vela X-1 is an eclipsing high mass X-ray binary (HMXB) consisting of a 283s accreting X-ray pulsar in a close orbit of 8.964 days around the B0.5Ib supergiant HD77581 at a distance of just 2.4 kpc. The system is considered a prototype of wind-accreting HMXB and it has been used as a baseline in different theoretical or modelling studies. We discuss the observational properties of the system and the use of the observational data as laboratory to test recent developments in modelling the accretion process in High-Mass X-ray Binaries (e.g., Sander et al. 2018; El Mellah et al. 2018), which range from detailed descriptions of the wind acceleration to modelling of the structure of the flow of matter close to the neutron star and its variations.Comment: 4 pages, 2 figures, proceedings of the 12th INTEGRAL conference "INTEGRAL looks AHEAD to Multimessenger astronomy" in Geneva (Switzerland) on 11-15 February 201

Difficult Life Situation through the Eyes of Sports Youth

Рукопись поступила в редакцию: 23.05.2023. Принята к публикации: 28.06.2023.Received: 23.05.2023. Accepted: 28.06.2023.В статье представлены результаты исследования представленности трудной жизненной ситуации в восприятии молодежи Института физической культуры, спорта и молодежной политики УрФУ, проведенного с использованием авторского анкетирования. В новом мире у «новой молодёжи» понятие трудной жизненной ситуации меняется – от ситуации, объективно затрудняющей жизнедеятельность человека, к ситуации, субъективно представляющей затруднения для самореализации, чаще всего напрямую не имеющей отношение к человеку в моменте, скорее беспокоящей гипотетически. В целом у большей части молодежи выявлено ощущение безопасности себя в мире, в трудности у большинства ассоциируются с неопределенностью и непредсказуемостью, остальные категории связаны скорее с типовыми возрастными страхами. В итоге статьи предложен образовательный квест «Цифровая умничка», который позволит отработать навыки отслеживания сигналов небезопасности в цифровой среде, а также сформировать компетенции по управлению неопределенностью. Показана необходимость создания превентологических условий для молодежи в образовательном процессе.The article presents the results of a study of the representation of a difficult life situation in the perception of young people at the Institute of Physical Culture, Sports and Youth Policy of UrFU, conducted using the author’s survey. In the new world, the “new youth” concept of a difficult life situation changes - from a situation that objectively impedes a person’s life, to a situation that subjectively presents difficulties for self-realization, most often not directly related to a person at the moment, rather disturbing hypothetically. In general, most of the youth revealed a sense of security in the world, the majority associate difficulties with uncertainty and unpredictability, the rest of the categories are more associated with typical age-related fears. As a result of the article, the educational quest “Digital smart girl” is proposed, which will allow you to work out the skills of tracking insecurity signals in the digital environment, as well as to form competencies in managing uncertainty. The necessity of creating preventive conditions for youth in the educational process is shown

Cross-relaxation and phonon bottleneck effects on magnetization dynamics in LiYF4:Ho3+

Frequency and dc magnetic field dependences of dynamic susceptibility in diluted paramagnets LiYF$_4$:Ho$^{3+}$ have been measured at liquid helium temperatures in the ac and dc magnetic fields parallel to the symmetry axis of a tetragonal crystal lattice. Experimental data are analyzed in the framework of microscopic theory of relaxation rates in the manifold of 24 electron-nuclear sublevels of the lowest non-Kramers doublet and the first excited singlet in the Ho$^{3+}$ ground multiplet $^5I_8$ split by the crystal field of S$_4$ symmetry. The one-phonon transition probabilities were computed using electron-phonon coupling constants calculated in the framework of exchange charge model and were checked by optical piezospectroscopic measurements. The specific features observed in field dependences of the in- and out-of-phase susceptibilities (humps and dips, respectively) at the crossings (anti-crossings) of the electron-nuclear sublevels are well reproduced by simulations when the phonon bottleneck effect and the cross-spin relaxation are taken into account

Evaluation of the population of the Sverdlovsk region on drinking alcohol

During the work, the results of a survey of population of the Sverdlovsk region in relation to drinking of alcoholic beverages were analyzed. Risk groups for targeted information have been identified.В ходе работы были проанализированы результаты анкетирования жителей Свердловской области по отношению к употреблению алкогольных напитков. Установлены группы риска для целевого информирования

Weakly-nonlocal Symplectic Structures, Whitham method, and weakly-nonlocal Symplectic Structures of Hydrodynamic Type

We consider the special type of the field-theoretical Symplectic structures called weakly nonlocal. The structures of this type are in particular very common for the integrable systems like KdV or NLS. We introduce here the special class of the weakly nonlocal Symplectic structures which we call the weakly nonlocal Symplectic structures of Hydrodynamic Type. We investigate then the connection of such structures with the Whitham averaging method and propose the procedure of "averaging" of the weakly nonlocal Symplectic structures. The averaging procedure gives the weakly nonlocal Symplectic Structure of Hydrodynamic Type for the corresponding Whitham system. The procedure gives also the "action variables" corresponding to the wave numbers of $m$-phase solutions of initial system which give the additional conservation laws for the Whitham system.Comment: 64 pages, Late

Results of the hygienic price of artificial lighting in the barbershop in 2018-2020

The article deals with the problems of artificial lighting in the workplace of a hairdresser and barbershop administratorВ статье рассмотрены проблемы искусственного освещения на рабочем месте парикмахера и администратора «барбершопа