bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spiritual Status Related to Life Quality Of Elderly
Authors: Hannan Mujib , Hidayat Syaifurrahman 
Published: October 2021

ABSTRACT
Good spiritual owned by the elderly will help them in maintaining the relationship with God, people around, and environment, so that they can realize and know the purpose of life in the future. Elderly suffer from various health problems due to the vulnerability of many physical and mental disorders. Quality of life in the elderly can be influenced by many environmental factors. Quality of life tends to be good when the physical and psychological conditions are healthy and functioning properly. The research method used analytic correlation with cross-sectional design, the population in this study was the elderly who were more than 45 years old, the sampling technique was Simple Random Sampling with 83 samples. Analysis technique to determine the relationship betwen spiritual status with quality of life of the elderly used Spearman test. The results of this study said that most of the respondents' spiritual status can be categorized as high as 48 people (57.8%) and most of the quality of life of respondents can be categorized as good as 46 people (55.4%). In other words, it can be concluded that Spearman Rho test results indicated that Significancyp value = 0.004 (p <0.005). For the result, it means that there was a relationship between spiritual status and quality of life of elderly. Quality of life is a humans’s subjective feelings about their well-being, based on their current life experience, in which spiritual significantly is able to help the elderly and provide services to adapt with changes caused by chronic disease.
Keywords: spiritual status, life quality, elderly
Mathematical modeling of the stationary ascending swirling flows in the vicinity of contact surface
Authors: Баутин С.П. , Мезенцев А.В. , Дерябин С.Л. 
Published: October 2021

Рассмотрены стационарные трехмерные течения идеального политропного газа, примыкающие через вертикальную контактную поверхность к области покоя
в условиях действия сил тяготения и Кориолиса. Показано, что такие течения описываются решениями соответствующей начально-краевой задачи для системы
уравнений газовой динамики, которые в работе строятся в виде локально сходящихся рядов. Коэффициенты этих рядов определяются в параметрической форме
при решении систем обыкновенных дифференциальных уравнений. Параметры газа на контактной поверхности и в ее окрестности восстанавливаются численно.
This work addresses mathematical modelling of such part of ascending swirling flows
which adjoins a resting gas in the central part of the flow.
The methodology contains the formulation of the initial-boundary problems for the
system of equations of gas dynamics subject to gravity and Coriolis forces. The solutions
of the problem is presented in the form of infinite convergent series. The coefficients are
determined recurrently using the system of ordinary differential equations.
The findings of this work include a proof of the existence and uniqueness solutions
of the characteristic Cauchy problem in the standard form. These solutions describe
the corresponding part of a three-dimensional stationary ascending twisting flow.
The coefficients of the series are the solutions of the specific system of ordinary differential
equations. The initial coefficients are used for the approximate presentation of the
unknown flows.
Originality of the work is that for ascending swirling flows the mathematical problem
is posed. The solution of problem describes the flow in the vicinity of the vertical contact
surface. The existence of solution in the class of analytic functions is proved and the
required flow is approximately described.
Application of mixed non-conforming variational formulations for solving the Darcy problem
Authors: Иткина Н.Б. , Трофимова С.А. 
Published: October 2021

Предлагается и анализируется построение вычислительной схемы для задачи Дарси с тензорным коэффициентом проницаемости среды при использовании смешанной конечно-элементной аппроксимации на базе разрывного метода Галёркина. Рассматривается построение базиса для скорости в специальном функциональном пространстве Hdiv , а также базиса для давления в пространстве L 2. Проводится верификация полученной вычислительной схемы на классе задач, имеющих аналитическое решение, а также представляются результаты экспериментов с контрастным тензорным коэффициентом проницаемости среды.
We consider the construction of a computational scheme for the Darcy model with a tensor permeability coefficient. We use the mixed finite element approximation based on the discontinuous Galerkin formulation. Recently the mixed method has become one of the modern approaches for a numerical solution of the Darcy problem. The main idea
of this method is to approximate both the primary and dual variables, while searching for the critical point of the corresponding functional over the finite-element space of
admissible test functions, which can be represented as a direct sum of two or more subspaces. This approach permits us to find a solution that corresponds to the physics of the simulated processes. The advantages and disadvantages of the mixed method are discussed in this paper.
We use numerical fluxes and jump stabilization following the approach of F. Brezzi, T.J.R. Hughes, L.D. Marini and A. Masud and obtain the computational scheme that is stable at the contrast value of the tensor permeability coefficient. Two hierarchical basis systems for the velocity from
The restoration of temperature distribution in a two-dimensional domain by a tomographic method by using the results of measurements for electric resistance of oriented conductors
Authors: Деревянко В.А. , Латыпов А.Ф. 
Published: October 2021

Рассмотрена возможность использования “термометра сопротивления” для измерения распределения температуры в двумерной области. Создана математическая модель датчика, сводящаяся к решению томографической задачи. Важной особенностью модели является то, что число уравнений в системе линейных алгебраических уравнений (СЛАУ) больше числа переменных. Это позволяет уменьшить ошибки в исходных данных. Создана программа для определения решения СЛАУ с плохо обусловленной матрицей, позволяющая обрабатывать результаты измерений в реальном масштабе времени. Выполнен тестовый расчет. При малом числе ракурсов измерений получена удовлетворительная точность восстановления температуры.
Purpose. To ensure a long period of active lifetime of space vehicles, it is necessary to use effective methods and means to control physical processes leading to premature failure of on-board radio electronic equipment both at the stage of ground testing and during active operation of the spacecraft in space. Long-term testing experience for electronic equipment shows that monitoring compliance with necessary temperature conditions of onboard equipment plays the main role in ensuring reliability. Ideally, the thermal control should be performed for all elements of radio electronic units in real
time.
Method. The possibility of using a “two-dimensional resistance thermometer” for recording the thermal field of a printed circuit board of an electronic unit is considered. The principle of operation of the thermometer is based on the measurement
of integral resistances of extended mutually intersecting conductors in a medium with inhomogeneous temperature distribution. The registration of the integral resistances of
individual conductors is possible with the help of an automated measuring system by solving the tomographic problem aimed to obtain the temperature distribution on the
surface of the printed circuit board.
Result. The design of the “two-dimensional temperature sensor” is considered. The sensor is technologically compatible with the design of the printed circuit board
of the radio electronic unit. A mathematical model of the sensor is developed. It is reduced to the solution of a tomographic problem. A program for solving a system of
linear equations with an ill-conditioned matrix is developed that provides the real-time processing for measurement results. The test calculation is performed. A satisfactory
accuracy of the temperature restoration is achieved.
Conclusion. A “two-dimensional resistance thermometer” can be used to measure a two-dimensional temperature field for a printed circuit board of a radio electronic unit in real time. The mathematical model allows adapting the thermometer design to a specific radio electronic unit and selecting the required accuracy of the temperature field restoration.
An analytic method of efficiency estimation of multimedia content distribution networks
Authors: Приставка П.А. , Рябко Б.Я. 
Published: October 2021

Предложен основанный на теоретико-информационном подходе метод оценки эффективности сетей передачи данных. Метод позволяет получить априорную
оценку эффективности проектируемой сети на основе информации о ее параметрах, так как для получения оценки не требуется наличия действующей сети и
данных, получаемых в процессе ее эксплуатации. Дано описание метода, а также приведены примеры его использования для оценки эффективности сетей доставки контента и сетей на базе peer-to-peer-технологии.
Purpose. Development and investigation of the method for analytical estimation
for the efficiency of data transmission networks basing on the details of the supposed
network parameters. This method allow us to evaluate a priori comprehensive estimation
of efficiency of the network being designed without the necessity of collecting and
analyzing real world network operational data.
Methodology. A set of files to be downloaded by the network node is considered
as a subsequence of letters generated by stationary and ergodic process. Basing on the
fundamentals of Information theory the entropy efficiency was defined to characterize
a capacity of data transmission network. Informally, the value actually indicates the
growth rate of the amount of files that can be transmitted via the network depending
on a certain unit of time. To model the distribution of the probability of access to files,
Zipf’s law was used.
Findings. A general description of a method for efficiency estimation of data
transmission networks was presented in the paper. Detailed guidelines to apply the
method to the estimation of multimedia content delivery networks and file sharing P2P
networks, i. e. systems of two wide spread classes, were shown. The method was also
investigated on the software models of the systems to show the possibility of using the
method as a tool for optimal selection of network parameters.
Originality/value. The suggested information-theoretic method is aimed to analytically
estimate the efficiency of the data transmission networks. It can be used as
a strong tool to construct both new multimedia data transmission systems and optimization
of the existing services.
A reduced formulation for modelling time-harmonic electromagnetic field in the media with thin highly conductive inclusions
Authors: Шурина Э.П. , Добролюбова Д.В. , Штанько Е.И. 
Published: October 2021

При решении задач электромагнетизма в широком частотном диапазоне в областях с тонкими пластинами, оболочками и экранами численными методами возникает проблема резкого роста сеточной дискретизации вблизи внутренних структур с разномасштабными габаритными размерами. В работе предложена модификация вариационной постановки векторного метода конечных элементов, основанная на
снижении размерности модели в окрестности тонких включений, которая позволяет преодолеть эту проблему за счет специфического учета таких структур на уровне вариационной постановки. Так как редуцирование модели обычно приводит к появлению ограничений на область ее применимости, выполнено исследование
диапазона допустимых частот, контрастности электрофизических характеристик матрицы и включений, геометрических особенностей внутренней структуры, для которых предложенная модель позволяет получить корректные с точки зрения физики результаты.
Purpose. In this paper, we propose a reduced variational formulation for the Helmholtz equation for the electric field, in which thin highly conductive objects are approximated by surfaces with the equivalent surface current density. We conduct a study aimed at defining the range of application for the reduced variational formulation, focusing on highly contrasting thin objects of various geometrical shape and arrangement in a wide frequency range.
Methodology. The modelling is performed on unstructured tetrahedral meshes. Since the reduced variational formulation treats thin highly conductive objects as surfaces, no volume mesh is constructed inside of them.We compare the results obtained by the vector FEM using the proposed variational formulation with the results obtained using standard formulation.
Findings. Due to the fact that the proposed variational formulation does not require volume meshing of the thin objects, its computational cost is significantly lower.
However, the reduced formulation yields correct results in a restricted frequency range. It also imposes some limitations on the minimal contrast and maximal thickness of the
thin highly conductive objects.
Originality/value. The proposed reduced variational formulation can be applied to simulate the time-harmonic electric field in the media with thin highly conductive
inclusions of either regular or chaotic arrangement, as well as thin shielding plates or casings of various geometrical forms.
Asymptotic behaviour of dam break flow for small times
Authors: Демирель Дамла Исидичи , Яфрати Алессандро , Коробкин Александр , Йилмаз Огуз 
Published: October 2021

Двумерное импульсное течение жидкости изучается в рамках теории потенциального потока. Первоначально жидкость находится в состоянии покоя и удерживается на одной стороне вертикальной пластины. Она внезапно убирается и поток жидкости начинает течь под действием силы тяжести. Внимание уделяется особому поведению поля скоростей в нижней точке, где вертикальная свободная поверхность встречается с жестким дном. Линейная задача решается методом рядов Фурье. Решение внутренней области находится с помощью преобразования Меллина в нижней точке. Формирование струи наблюдается в нижней точке. Разрыв в верхней угловой точке исследуется с помощью Лагранжевых переменных. Для внешней задачи второго порядка используется метод декомпозиции области. Сравнение форм свободных поверхностей вблизи верхней угловой точки с решениями переднего и второго порядка показывает, что внешнее решение второго порядка имеет большее различие в вертикальной свободной поверхности, чем в горизонтальной части, по сравнению с решением ведущего порядка. Получена картина форм свободных поверхностей с использованием Лагранжевого описания для верхней части и Эйлерого описания для нижней части во втором порядке.
Two dimensional impulsive flow of a fluid is studied within the potential flow theory. Initially the fluid is at rest and is held on one side of a vertical plate. The plate is withdrawn suddenly and gravity driven flow of the fluid starts. Attention is paid to the singular behaviour of the velocity field at the bottom point, where the vertical free surface meets the rigid bottom. The linear problem is solved by the Fourier series method. An inner region solution is found using Mellin transform at the bottom point. The jet formation is observed at the bottom point. Also the discontinuity at the upper corner point is dealt with Lagrangian variables. For the second order outer problem, domain decomposition method is used. Comparison of the shapes of the free surfaces near the upper corner point with leading and second order solutions shows that the second order outer solution outer makes a larger difference in the vertical free surface than in the horizontal portion, compared with leading order solution.The complete picture of the shapes of the free surfaces using Lagrangian description for the upper part and Eulerian description for the bottom part at the second order is obtained.
Regression derivatives and their application for registration of a tsunami wave arrival by sea-level records
Authors: Агаян Сергей Мартикович , Богоутдинов Шамиль Рафекович , Иванченко Ольга Васильевна , Камаев Дмитрий Альфредович 
Published: October 2021

Структура дискретного временного ряда тесно связана со свойствами процесса, который он описывает. В рамках дискретного математического анализа имеется несколько подходов к анализу структуры дискретных рядов: геометрические меры, динамические коридоры и концепция тренда. Для дискретного временного ряда, заданного в общем случае на нерегулярной сетке, с характером тренда тесным образом связана регрессионная производная: области ее положительного (отрицательного) значения соответствуют возрастающим (убывающим) трендам, а границы между ними - экстремумам. В настоящей работе исследуются возможности применения методов дискретного математического анализа для разработки процедуры регистрации вступления волны цунами по оперативным данным измерения уровня моря.
The research addresses the possibility of application of the methods of discrete mathematical analysis to develop a procedure for recording tsunami wave arrival on the base of the operational data for measuring sea level. As a basis for constructing a tsunami wave registration procedure, this research uses a schematization of the actions of the oceanographer on-duty during visual analysis of the sea level records. The task of automatic registration of a tsunami wave by sea level recording arises in various situations of information support of the oceanographer on duty. Requirements for the processing of sea level records depend on the situation. The structure of a discrete time series is closely related to the properties of the described process. As part of the discrete mathematical analysis, there are several approaches to the analysis of the structure of discrete series: geometric measures, dynamic corridors and the trend concept. For a discrete time series, given in the general case on an irregular grid, the regression derivative is closely related to the nature of the trend: the areas of its positive (negative) values correspond to the increasing (decreasing) trends, and the boundaries between them are extremes. The content of this research is a presentation of data processing techniques using regression derivatives, constructing data processing procedures based on derivatives, as well as a demonstration of their applicability to the problem of recording tsunami wave arrival according to the measuring of sea level.
Effect of the shape of initial perturbation on a reflected long wave from a beach
Authors: Аникин Анатолий Юрьевич , Доброхотов Сергей Юрьевич 
Published: October 2021

Изучаются асимптотические решения двумерного волнового уравнения с переменной скоростью и вырождением на границе области (берега). Рассматривается задача Коши с локализованными начальными данными, отвечающая поршневой модели цунами. Приведена асимптотическая формула для решения, работающая в малой окрестности берега. Исследуется вопрос о симметрии набегающей и отраженной волн. Этот же вопрос изучается для волнового уравнения с правой частью, отвечающей распределенному по времени источнику.
The paper addresses the two-dimensional wave equation with variable velocity in a bounded domain. The velocity is assumed to degenerate on the boundary of the domain (the shore) as a square root of the distance to the boundary. We consider the Cauchy problem with localized initial data corresponding to the piston tsunami waves model. This problem is studied from the viewpoint of the asymptotic theory, where the small parameter µ is set by the ratio of the characteristic wave length to the characteristic size of the domain (the ocean). We propose an asymptotic formula for the solution working in a neighborhood of the shore of order µ . We study the symmetry between an incoming and reflected wave profiles. It turns out that profile shape does not change if the Fourier transform of the initial source function is real. This happens because the wave profile is close to an eigenfunction of the Hilbert transform. We also study the symmetry of profiles for the inhomogeneous wave equation. The right-hand side of this equation corresponds to a time spread source as opposed to instantaneous one in the piston model. This linear problem is a first step in studying more complicated system of the shallow water equations. The latter system is nonlinear, however in view of the results due to Carrier and Greenspan, its solution can be found if the solution of the linearized problem is known.
Development of Federal telecommunication and computer infrastructure for research and education
Authors: Гончар А.А. , Овсянников А.П. , Сорокин А.А. , Шабанов Б.М. , Юрченко А.В. 
Published: October 2021

Развитие национальной телекоммуникационной сети науки и образования играет ключевую роль в проведении научных исследований в современных условиях. В 2019 г. создана Национальная исследовательская компьютерная сеть (НИКС) телекоммуникационная сеть федерального масштаба, которая должна представлять национальную сеть науки и образования на международной арене. Планы развития НИКС включают организацию магистральной кольцевой инфраструктуры на территории Сибирского и Дальневосточного федеральных округов, расширение взаимодействия с региональными сетями, развитие сетевых сервисов, в том числе передачи данных с заданными требованиями по уровню обслуживания. Реализация планов позволит существенно расширить возможности информационно-телекоммуникационной инфраструктуры сферы науки и образования для проектов мегасайенс, высокопроизводительных и распределенных вычислений, искусственного интеллекта.
National research and educational network (NREN) is a key factor for modern research and education. The article considers the prospects and directions of the NREN development in the Russian Federation. In 2019, as a result of the merging of the departmental research and educational networks RUNNet and RASNet, a federal scale telecommunications network called the National research computer network (NRCN) was created. It should play the role of a NREN for the international cooperation projects. The concept of NRCN was approved at the Meeting of the Council of the Ministry of Science and Higher Education of the Russian Federation on information and telecommunication infrastructure, information security and supercomputer technologies. NRCN development plans include setting up the circle backbone infrastructure as well as deploying the federal network nodes in the Siberia and the Far East and providing effective interconnection to the present regional network nodes. The plan is intended to optimize network connectivity and to improve the quality of the data transmission as well as to implement Service Level Agreement (SLA) and variety network services for research and education. The implementation of the considered plans will significantly improve the reliability of the backbone and regional components of the NRCN, expand the potential of the IT infrastructure for research and education, focused on the MegaScience, highperformance and distributed computing, Big Data, Deep Learning and AI.