Tris(ethane-1,2-diamine)copper(II) bis­(trifluoro­acetate)

In the title complex, [Cu(H2NCH2CH2NH2)3](CF3COO)2, the environment of the Cu atom is distorted octa­hedral, formed by six N atoms from three chelating ethane-1,2-diamine ligands. The Cu—N distances range from 2.050 (2) to 2.300 (2) Å. This complex cation and the two trifluoro­acetate anions are connected by weak N—H⋯O and N—H⋯F hydrogen bonds, forming a three-dimensional framework. In both anions, the F atoms are disordered over two positions; in one the site-occupancy factors are 0.55 and 0.45, in the other the values are 0.69 and 0.31

The problem of cognitive-semantic grounds for verbs polysemy in English

The given article considers the problem of the cognitive and semantic basis for polysemanticism of verbs in English as one of the main mental processes that promotes changes and development of the meaning of words, the verbs in particula

Фольклорная традиция в художественном мире А. П. Чехова: часть вторая

This article continues a large study on folk tradition functioning in Chekhov’s poetics. The study subject is the forms of folklore tradition in his late stories. Much attention is paid to amusical aspect of “The Steppe”. In this case a Russian lyric song having a non-outlined composition is typologically significant. The story with its open end is like a song which allows the hero growing over himself. The main method of the article is structural-typological one.Este artículo continúa un gran estudio sobre la tradición popular que funciona en la poética de Chéjov. El tema de estudio son las formas de tradición folclórica en sus últimos cuentos. Se presta mucha atención al aspecto musical de "La Estepa". En este caso, una canción lírica rusa que tenga una composición no esbozada es tipológicamente significativa. La historia con su final abierto es como una canción que le permite al héroe crecer sobre sí mismo. El principal método del artículo es estructural-tipológico.Данная статья продолжает большое исследование о функционировании фольклорной традиции в поэтике Чехова. Предметом исследования являются формы фольклорной традиции в поздних повестях. Большое внимание уделено музыкальному аспекту повести "Степь". Типологически значима в этом случае русская лирическая песня, которая имеет неоконтуренную композицию. Повесть похожа на песню своим открытым финалом, который позволяет герою вырасти над самим собой. Основным методом статьи является структурно-типологический

Methods of the development strategy of service companies: Logistical approach

The urgency of the analyzed issue is due to lack of attention of heads of service companies to the theory and methodology of strategic management, methods and models of management decision-making in times of economic instability. The purpose of the article is to develop theoretical positions and methodical recommendations on the formation of the logistical approach to the development strategy of service companies. The leading approach to the study of this issue is the logistical approach, which allows identifying the most significant factors, carrying out the quantitative assessment of their interaction with each other and determining the extent of their influence on the parameters of the system under research. This research presents a methodology for the selection of optimal functional business strategies of service companies from the alternative, based on the use of economic and mathematical modeling techniques. The authors assess the parameters of the micro, macro and internal environment of the company, represent the company’s business profile, a general development strategy of based on the determination of optimal logistics, marketing, production, financial and human resource management strategies for individual strategic business areas. The contents of the article may be useful for managers of service companies, auto-transport enterprises in making rational decisions on the formation of the optimal business development strategy in uncertain environmental conditions. © 2016 Toymentseva et al

Teaching motor skills by means of biomechanical analysis of the motion: the physiological basis and applied information technologies

The article proves the possibility of training athletes using motor skills on the basis of biomechanical analysis of movements with application of information technologies. Motion Tracking – digital single frame shooting photography – is proposed as a method for biomechanical analysis. The relevance of this method is conditioned by the results of the study of a repulsion phase in the performing of the standing jump by athletes of different qualifications. The conclusion about the importance of an optimal model of a jump based on biomechanical analysis is given, and the formation of athletes’ skills, using information technologies and the principle of urgent information, is discussed

Using of Residual Number System as a Mathematical Basis for Software Defined Radio

Вступ. У традицiйному виглядi, програмно-визначена радiосистема (Software Defined Radio, SDR) являє собою обчислювальне ядро, обладнане приймально-передавальними блоками. З метою прискорення обчислювальних операцiй у системах SDR, пропонується у якостi математичної основи застосування системи залишкових класiв. Результати попереднiх дослiджень, що проводились рiзними групами вчених з метою пошукiв шляхiв пiдвищення продуктивностi обчислювальних засобiв, методiв органiзацiї ефективної системи виявлення та виправлення помилок, а також побудови надiйних обчислювальних комплексiв, дають можливiсть стверджувати, що в межах позицiйних систем числення не можна очiкувати принципових зрушень в даних напрямках без суттєвого збiльшення робочих частот i ускладнення апаратної частини. Перевагою пропонованого методу є те, що програмна радiосистема може складатися з декiлькох ПЛIС i обслуговувати декiлька незалежних радiоканалiв, а перепрограмування властивостей дозволяє змiнювати число i складовi процесу обробки повiдомлень в залежностi вiд поточних умов роботи. Метод дослiдження. В роздiлi проаналiзовано паралельнiсть арифметичнi операцiї у системi залишкових класiв. Цi операцiї називаються модульними, оскiльки для обробки числових значень використовують невеликi залишки дiлення на певний набiр модулiв, а для додавання i множення потрiбно лише один тактовий цикл роботи обчислювальної системи. Для перетворення чисел iз двiйкової системи у RNS використовується алгоритм, заснований на застосуваннi китайської теореми про залишки. Проте такi операцiї, як подiл, порiвняння двох чисел i виявлення знака, є складними i ресурсо-затратними в RNS. Для цих проблемних операцiй було запропоновано кiлька рiшень. Вони полягають у вiдсутностi процесу перетвореннi залишку в бiнарну систему (зворотне перетворення) шляхом застосування цифро-аналогових перетворювачiв у RNS. З iншого боку, вибiр правильного набору модулiв є ще одним важливим питанням для побудови ефективного RNS з достатнiм динамiчним дiапазоном. Результати та аналiз. Пiдводячи пiдсумки деяких результатiв, можна зазначити, що система класiв залишкiв дозволяє значно полiпшити параметри обчислювача у SDR, а особливо у функцiональному блоковi Direct Digital Synthesizers (DDS) у порiвняннi з обчислювачем, побудованим на тiй же фiзичнiй i технологiчнiй основi, але в позицiйнiй обчислювальнiй системi, а також отримання нових бiльш прогресивних конструктивних i структурних рiшень. Експериментальнi результати показують, що представленi методи дають значнi переваги для цифрових фiльтрiв у SDR, якi характеризуються високим динамiчним дiапазоном i мають велику кiлькiстю ланок, особливо коли повнi перемножувачi не доступнi у цiльовiй архiтектурi FPGA, або коли цi перемножувачi повиннi використовуватися для рiзних цiлей. Висновки. Таким чином, запропонована система вносить явнi переваги перед iснуючими системами i показує переваги продуктивностi обчислювальних операцiй i може бути використана для побудови сучасних систем зв’язку. Запропонована архiтектура зменшує розмiри конвеєру суматорiв i перемножувачiв, що є дуже важливим фактором при розробцi високошвидкiсних SDR.Introduction. In the classic view, program-defined radio system (Software Defined Radio, SDR) is a central processor, equipped with receiving and transmitting units. In order to speed up computational operations in SDR systems it is proposed to use the system of residual classes as a mathematical basis. The results of research conducted by various groups of scientists in order to find ways to improve the performance of computing tools, methods of organizing an effective system for detecting and correcting errors, as well as building reliable computer systems, make it possible to assert that, within the limits of positional number systems, no fundamental changes can be expected in these areas without a significant increase in operating frequencies and hardware complications. The advantage of this method is that a software radio system can consist of several FPGAs and serve several independent radio channels, and reprogramming the properties allows you to change the number and components of message processors depending on current operating conditions. Research method. The equations in this section show the parallel nature of the RNS, free from bit transfers. These operations are called modular, because for it takes only one clock cycle to process the numerical values. To convert numbers from the binary position number system to RNS we use an algorithm based on the application of a distributed arithmetic. However, operations such as division, comparison of two numbers, and the detection of a sign are laborious and expensive in RNS Several decisions were proposed for these problem operations. They consist in the absence of the process of converting a residue into a binary system (reverse transformation) by using digital-to-analog converters in RNS. On the other hand, choosing the right set of modules is another important issue for building an effective RNS with a sufficient dynamic range. Results and analysis. Summing up some results, it can be noted that the system of residual classes allows to significantly improve the parameters of a computer in SDR especially in functional block a Direct Digital Synthesizers (DDS) in comparison with a computer built on the same physical and technological basis, but in a positional system calculation, and also to receive new more progressive constructive and structural solutions. The experimental results shows that the presented techniques offer interesting advantages for FIR filters characterized by high dynamic range and high number of taps especially when full custom multipliers are not available in the target FPGA architecture or when they must to be used for different purposes. Conclusion. Thus, the proposed system introduces clear advantages over existing systems and shows performance advantages and can be used to build modern communication systems. The proposed architecture reduces the size of the pipeline adders and multipliers which is a very important factor in the design SDR for fast work.В статье рассмотрены принципы построения и функционирования систем, определенных программным обеспечением (Software Defned Radio, SDR). С целью ускорения вычислительных операций в системах SDR предлагается применение системы остаточных классов в качестве математической основы построения систем. Преимуществом приведенного метода является то, что программная радиосистема может состоять из нескольких ПЛИС и обслуживать несколько независимых радиоканалов, а перепрограммирование свойств позволяет изменять число и составляющие процессоры сообщений в зависимости от текущих условий роботы. Приведены проблемы формирования выходного сигнала. Описаны особенности внедрения операций прямого и обратного преобразований с позиционных на непозиционые системы исчисления. Рассмотрена структурная модель SDR с прямыми цифровыми синтезаторами частоты, ЦАП, АЦП, цифровыми фильтрами в системе остаточных классов. Рассмотрены методы преобразования системы остаточных класов в аналоговый сигнал. Рассматриваются проблемы эффективного использования площади кристалла для SDR и уменьшения задержек в формировании выходного сигнала. Полученные результаты показывают широкие возможности применения программно определенной радиосистемы в системе остаточных классов

Analysis of specialized care for patients with diabetic foot syndrome in St. Petersburg for 2010–2021

BACKGROUND: A decrease in the frequency of amputations due to diabetic foot syndrome (DFS) is one of the parameters that determine the quality of medical care for patients with diabetes mellitus.AIM: Our aim was to study the indicators characterizing medical care for patients with lower limb pathology in diabetes mellitus in St. Petersburg from 2010 to 2021.MATERIALS AND METHODS: Annual reports on the treatment of patients with DFS in city hospitals specializing in the surgical treatment of DFS and in outpatient offices «Diabetic foot» (DFO) from 2010 to 2021 were analyzed.RESULTS: The average number of patients per year admitted to the DFO was 18,527 (34,440 visits). Proportion of patients with foot ulcers — 8,9%, with Charcot’s arthropathy — less than 1%. Before 2020, the frequency of above the foot amputations decreased from 48.3% to 8.6%, hospital mortality — from 11.7 to 5.7%, the number of revascularizations increased from 37 to 642 per year. The increase in operational activity was not accompanied by a decrease in the frequency of amputations (59.3% in 2019). Of all amputations, 11.3% were patients referred from DFO. During the epidemic, the number of visits and patients admitted to the DFO decreased by 27,3% and 31%, respectively. The proportion of foot ulcers and the frequency of amputations have not changed. Inpatient care was characterized by a decrease in operational activity, a decrease in the availability of revascularization, a 2-fold increase in the proportion of high amputations and an increase in hospital mortality from 5.7% in 2019 to 14.9% in 2021.CONCLUSION: An analysis of the statistics of specialized care for patients with DFS over 12 years showed the reduction of the frequency of high amputations, but revealed an increase in the frequency of surgical interventions in DFS against the background of an almost unchanged proportion of amputations in the structure of all operations. Despite significant quantitative indicators, the outpatient service seems to be insufficiently effective in reaching the target population. The negative impact of the epidemic has led to a significant increase in the frequency of high amputations and mortality

Prerequisites for setting up management system in municipal retail trade

The relevance of the problem is determined by the number of complex problems that exist in present Samara municipal retail trade system, which is manifested in the lack of regulation, a glut of sales area, poorly developed infrastructure. The purpose of this article is to form a quantitative base for determining the municipal needs in the floor space. Leading method to study this problem is the method of empirical observations and mathematical modeling. The study results: the article contains the analysis of sales area availability on the example in the urban district and presents a quantitative method to determine predictive values for retail trade turnover. Practical significance: the paper is aimed to develop managerial decisions in the sphere of municipal trade regulation. © 2016 Suraeva et al