The monoid of queue actions

We investigate the monoid of transformations that are induced by sequences of writing to and reading from a queue storage. We describe this monoid by means of a confluent and terminating semi-Thue system and study some of its basic algebraic properties, e.g., conjugacy. Moreover, we show that while several properties concerning its rational subsets are undecidable, their uniform membership problem is NL-complete. Furthermore, we present an algebraic characterization of this monoid's recognizable subsets. Finally, we prove that it is not Thurston-automatic

Sorption Equilibria of Heavy Metals on Polysiloxane with Grafted 2-Aminoethylpyridine Functional Groups

A new silica-based organic-inorganic hybrid material with grafted 2-aminoethylpyridine functional groups (SiAEP) has been synthesized by sol-gel method. Methods of the elemental analysis, 13С and 1H NMR spectroscopy have been used in order to find substance composition; surface-structural characteristics of the SiAEP have been defined by method of nitrogen adsorption–desorption isotherms. The effect of pH on the sorption of copper (II), nickel (II), cobalt (II), zinc (II), cadmium (II), and lead (II) ions has been studied. A selectivity order of SiAEP at рН=6.5 is as follows: Cu>Co>Zn>Ni>Pb>Cd. Sorption isotherms of heavy metal ions by SiAEP have been obtained, their mathematical processing by models of Langmuir, Freundlich, and Redlich-Peterson has been carried out. The values of the maximum uptake SiAEP capacity for Cu2+, Co2+, Zn2+, Ni2+, and Cd2+ ions have been defined to be of 2.04, 1.76, 1.46, 1.06, and 0.76 mmol/g, respectively.Золь-гель методом синтезовано новий органо-неорганічний матеріал з прищепленими 2-аміноетилпіридиновими функціональними групами (SiAEP). Методи елементного аналізу, 13С та 1H ЯМР-спектроскопії використано для визначення складу речовини; структурно-адсорбційні характеристики SiAEP визначено за ізотермами адсорбції та десорбції азоту. Вивчено вплив pH на сорбцію іонів міді (II), нікелю (II), кобальту (II), цинку (II), кадмію (II) та свинцю (II). Ряд селективності SiAEP при рН=6,5 наступний: Cu>Co>Zn>Ni>Pb>Cd. Одержано ізотерми сорбції іонів важких металів за допомогою SiAEP, виконано їхню математичну обробку за моделями Ленгмюра, Фрейндліха та Редліха-Петерсона. Величини граничної адсорбції для іонів Cu2+, Co2+, Zn2+, Ni2+ та Cd2+ виявились рівними відповідно 2,04, 1,76, 1,46, 1,06 та 0,76 ммоль/г.Золь-гель методом синтезирован новый органо-неорганический материал с привитыми 2-аминоэтилпиридиновыми функциональными группами (SiAEP). Методами элементного анализа, 13С и 1H ЯМР-спектроскопии определен состав вещества; структурно-адсорбционные характеристики SiAEP определены по изотермам адсорбции и десорбции азота. Изучено влияние pH на сорбцию ионов меди (II), никеля (II), кобальта (II), цинка (II), кадмия (II) и свинца (II). Ряд селективности SiAEP при рН=6,5 следующий: Cu>Co>Zn>Ni>Pb>Cd. Получены изотермы сорбции ионов тяжелых металлов на SiAEP, проведена их математическая обработка по моделям Лэнгмюра, Фрейндлиха и Редлиха-Петерсона. Величины максимальной сорбционной емкости SiAEP по ионам Cu2+, Co2+, Zn2+, Ni2+ и Cd2+ составили соответственно 2,04, 1,76, 1,46, 1,06 и 0,76 ммоль/г

Registration of atmospheric neutrinos with the Baikal neutrino telescope

We present first neutrino induced events observed with a deep underwater neutrino telescope. Data from 70 days effective life time of the BAIKAL prototype telescope NT-96 have been analyzed with two different methods. With the standard track reconstruction method, 9 clear upward muon candidates have been identified, in good agreement with 8.7 events expected from Monte Carlo calculations for atmospheric neutrinos. The second analysis is tailored to muons coming from close to the opposite zenith. It yields 4 events, compared to 3.5 from Monte Carlo expectations. From this we derive a 90 % upper flux limit of 1.1 * 10^-13 cm^-2 sec^-1 for muons in excess of those expected from atmospheric neutrinos with zenith angle > 150 degrees and energy > 10GeV.Comment: 20 pages, 11 figure

The Lake Baikal neutrino experiment

We rewiew the present status of the Baikal Neutrino Project and present the results of a search for high energy neutrinos with the detector intermediate stage NT-96.Comment: 3 pages, 2 figures, to appear in the Proceedings of Sixth International Workshop on Topics in Astroparticle and Underground Physics (TAUP99), September 6-10, 1999, Pais, Franc

Status of the Lake Baikal Experiment

We review the present status of the Baikal Underwater Neutrino Experiment and report on neutrino events recorded with the detector stages NT-36 and NT-96.Comment: 5 pages, 4 PostScript figures, uses here.sty and mine.sty, submitted to the Proc. of 5th Int. Workshop on Topics in Astroparticle and Underground Physics (LNGS INFN, Assergi, September 7-11, 1997

The Baikal Deep Underwater Neutrino Experiment: Results, Status, Future

We review the present status of the Baikal Underwater Neutrino Experiment and present results obtained with the various stages of the stepwise increasing detector: NT-36 (1993-95), NT-72 (1995-96) and NT-96 (1996-97). Results cover atmospheric muons, first clear neutrino events, search for neutrinos from WIMP annihilation in the center of the Earth, search for magnetic monopoles, and -- far from astroparticle physics -- limnology.Comment: Talk given at the Int. School on Nuclear Physics, Erice, Sept.199

Baikal-GVD

We present the status of the Gigaton Volume Detector in Lake Baikal (Baikal-GVD) designed for the detection of high energy neutrinos of astrophysical origin. The telescope consists of functionally independent clusters, sub-arrays of optical modules (OMs), which are connected to shore by individual electro-optical cables. During 2015 the GVD demonstration cluster, comprising 192 OMs, has been successfully operated in Lake Baikal. In 2016 this array was upgraded to baseline configuration of GVD cluster with 288 OMs arranged on eight vertical strings. Thus the instrumented water volume has been increased up to about 5.9 Mtons. The array was commissioned in early April 2016 and takes data since then. We describe the configuration and design of the 2016 array. Preliminary results obtained with data recorded in 2015 are also discussed

Promising Areas for Developing HR Managers' Competencies in the Digital Age

The rapid development of technologies is creating a new digital reality in human resource management. In the context of the transition to the digital economy and transformation of traditional classical organizations to digital ones, digital management decentralization will take place on the basis of digital technologies. The most important characteristic feature of a digital organization is interaction of the HR service with employees using mobile applications. Predictive HR analytics, employee-centered professional training, feedback not only at the vertical level but also at the horizontal level requires the development of new competencies of HR specialists. Based on the authors' research, implemented by a temporary creative team, the practice of developing managerial competencies in the process of digital transformation is analyzed using the example of HR management services in organizations at different levels of digital maturity. The study has shown understanding on the part of HR specialists that automation has a significant potential and will be in demand in all the companies, regardless of their size. The transition from a traditional organization to a digital one will require changes in the qualification requirements for HR specialists, readiness of HR specialists to acquire new digital competencies, to develop their professional skills and personal abilities

Алелопатична функція фенольних сполук плодових рослин

The data about the contents of phenolic compounds in fruit trees falls and roots (Rosaceae Juss.) is set out. It was determined that phenolic compounds are the reason of allelopathic postaction of fruit trees in orchards.Наведено дані про вміст фенольних сполук в опаді і коренях плодових рослин родини Rosaceae Juss. Показано, що фенольні сполуки є фактором алелопатичної післядії дерев у плодових садах

The research of feasible temperature modes in the ampoule channel with natural circulation

The paper presents the results of a computational analysis into the thin-wall sample cooling during in-pile irradiation in a two-body ampoule channel with heat transfer by natural convection. A two-body design of the channel makes it possible to change the channel wall heat resistance with the channel heat leak regulation by varying the gas composition and pressure inside the gap between the bodies. The purpose of the study is to determine the feasible sample cooling conditions in the considered channel. The computational analysis was based on a thermal-hydraulic code, RELAP5/MOD3.2. For the calculations, helium and nitrogen were assumed to be the filling gas for the gap between the bodies. Major regularities in the variation of irradiation temperatures have been shown depending on the power density in the channel and irradiation device structural materials, the circulation circuit height, and the channel wall heat resistance. By varying the circulation circuit height and the power density in the structural materials, it is possible to provide inside the ampoule channel the sample cooling temperatures in a range from the circumambient primary coolant temperature to the boiling temperature at a given pressure (50–331°C). With no coolant boiling on samples and with the maximum (8m) circulation circuit height, not more than 55kW (14W/g on samples) is removed when helium is used as the gap filling gas and not more than 15kW (3.7W/g on samples) is removed when nitrogen is used, while, with the minimum (1m) circulation circuit height, the respective values are not more than 10kW (2.5W/g on samples) and 5kW (1.2W/g on samples)