Photometric and Spectroscopic Investigation of the Dwarf Nova HS 0218+3229: A Short Review

This paper is devoted to the study of the cataclysmic variable HS 0218+3229 using the photometric and spectroscopic observations

The main manufacturers of suture materials in the Russian Federation

The article discusses the main manufacturers of suture materials in the Russian Federation, as well as the main types of manufactured suture materials. Information about the manufacturers of surgical suture materials and products are presented in the tablesВ статье рассмотрены основные производители шовных материалов в Российской Федерации, а также основные виды выпускаемых шовных материалов. Информация о производителях хирургических шовных материалов и производимой продукции представлены в таблица

Iso 9000 series international standards in quality management

The article discusses the international standards ISO 9000 series in quality management, as well as their role in the quality management system. The ISO 9000 series standards are presented in the tableВ статье рассмотрены международные стандарты ИСО серии 9000 в управлении качеством, а также их роль в системе управления качеством. Стандарты ИСО серии 9000 представлены в таблице

The 35-day cycle in the X-ray binary HZ Her/Her X-1

We present the results of modelling the 35-day superorbital changes in the B and V lightcurves and X-ray flux of HZ Her/Her X-1. The model is implemented in a computer program written in the C programming language, with a module for parameter optimisation written in Python. The model in-cludes a tilted precessing and warped accretion disc around a freely precessing neutron star. The disc is warped near its inner edge due to interaction with the rotating neutron star magnetosphere. The magnetic torque depends on the precessional phase of the neutron star. The neutron star X-ray emission flux also depends on the free precession phase, which modulates the X-ray illumi-nation of the optical star's atmosphere and the intensity of gas streams. We demonstrate that this model is able to reproduce both the optical observations of HZ Her and the behaviour of the system's 35-day X-ray cycle. © 2020 Astronomical Institute, Slovak Academy of Sciences

Adsorption of ascorbic acid from solution with the drug "Activated carbon"

The article presents data on the ability and effectiveness of the drug "Activated carbon" to adsorb ascorbic acid from the solution. The adsorption isotherm is presented.В статье изложены данные о способности и эффективности препарата «Активированный уголь» адсорбировать аскорбиновую кислоту из раствора. Представлена изотерма адсорбции

Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VIII: The Eighth Year (2015-2016)

Continuing the project described by Kato et al. (2009, arXiv:0905.1757), we collected times of superhump maxima for 128 SU UMa-type dwarf novae observed mainly during the 2015-2016 season and characterized these objects. The data have improved the distribution of orbital periods, the relation between the orbital period and the variation of superhumps, the relation between period variations and the rebrightening type in WZ Sge-type objects. Coupled with new measurements of mass ratios using growing stages of superhumps, we now have a clearer and statistically greatly improved evolutionary path near the terminal stage of evolution of cataclysmic variables. Three objects (V452 Cas, KK Tel, ASASSN-15cl) appear to have slowly growing superhumps, which is proposed to reflect the slow growth of the 3:1 resonance near the stability border. ASASSN-15sl, ASASSN-15ux, SDSS J074859.55+312512.6 and CRTS J200331.3-284941 are newly identified eclipsing SU UMa-type (or WZ Sge-type) dwarf novae. ASASSN-15cy has a short (~0.050 d) superhump period and appears to belong to EI Psc-type objects with compact secondaries having an evolved core. ASASSN-15gn, ASASSN-15hn, ASASSN-15kh and ASASSN-16bu are candidate period bouncers with superhump periods longer than 0.06 d. We have newly obtained superhump periods for 79 objects and 13 orbital periods, including periods from early superhumps. In order that the future observations will be more astrophysically beneficial and rewarding to observers, we propose guidelines how to organize observations of various superoutbursts.Comment: 123 pages, 162 figures, 119 tables, accepted for publication in PASJ (including supplementary information