bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Hijamah (Dry Cupping) on Frozen Shoulder: A Case Study
Authors:   Research Associate, Hijamah Section, All India Institute of Ayurveda, New Delhi, India, Abid Mohammad
Published: October 2021

Frozen shoulder or adhesive capsulitis is one of the most common causes of shoulder pain and disability in the general population. Its prevalence is 2-5% in the general population and 10-20% among diabetics. It predominantly affects females and most commonly affects people between the ages of 40 and 60 years. The left shoulder is more likely to be affected, with both shoulders affected in 12% of cases. A case study is presented to illustrate the clinical presentation, aetiology, diagnosis, radiological assessment, and management of frozen shoulder through Hijamah bila shurt (dry cupping) in a 60-year-old diabetic male patient. The present case was studied for over 8 weeks; Hijamah (dry cupping) was done on prescribed points for the affected shoulder twice a week for 8 weeks, and assessment was done at baseline and every 2 weeks. This study concluded that regimental therapy Hijamah bila shurt (dry cupping) has a significant effect in reducing pain, stiffness of joints, and increasing range of motion in frozen shoulder.
Determinants of Breastfeeding Practices among Lactating Mothers in a Rural Block ofHaryana, India
Authors:   Senior Resident, Department of Community Medicine, Pandit Bhagwat Dayal Sharma PGIMS, Rohtak, Haryana, India, Choudhary Priyanka
Published: October 2021

Background: Human breast milk contributes to the physical growth of infants by meeting their nutritional needs and higher intelligence quotient by enhancing their brain development. Objective: To assess the prevalence of exclusive breastfeeding and to determine the contributing factors of exclusive breastfeeding practice in a rural area of Haryana. Methods: It was community-based cross-sectional study, conducted in a rural field practice area attached to the Department of Community Medicine of Pt BD Sharma, PGIMS, Rohtak. The study participants were infants aged 6-11 completed months and their mothers. Multistage sampling technique was used for enrolling 200 study subjects. SPSS was us for statistical analysis. Results: 119 (59.5%) infants were exclusively breastfed for 6 months. Homemakers were 1.37 times more likely to feed exclusively than working women. Women from joint families were 2.64 times more likely to feed exclusively than women from nuclear families. Exclusive breastfeeding had a statistically significant association with mode of delivery, breastfeeding counselling, motivation to feed till 2 years, receiving postnatal checkup, number of children, initiation of breastfeeding within 1 hour, and colostrum being given to infants. Infants given breastfeed within 1 hour had 1.12 times more chance of exclusive breastfeeding. Conclusion: Antenatal breastfeeding counselling and home-based postnatal visits by health workers increases the practice of colostrum administration, initiation of breastfeeding within 1 hour, and exclusive breastfeeding for 6 months. Capacity building in form of training and sensitisation of hospital staff, MPHW (F), and ASHA will help increaseexclusive breastfeeding among lactating mothers.
A Study to Assess the Knowledge an Institutional Delivery among Primi Gravida Mother’s at Selected Hospital of Jabalpur City, Madhya Pradesh
Authors:   Department of Nursing, Dr. Sarvepalli Radha Krishnan (SRK) University, Bhopal, Madhya Pradesh, India, Tiwari Jyoti
Published: October 2021

Background: The institutional delivery is being widely promoted because of its ability to promote child survival and reduce risk of maternal mortality. A woman is likely to go through pregnancy complications at the time of labor. Institutional delivery gives a safe environment for the mother to avoid any risk of medical complications during labor. Aim: The present study was to evaluate the effect of planned teaching programme on the knowledge regarding premenopausal problem of women. Subject and Methods: Total sample size consumed of 100 women and convenience sampling was used area in Jabalpur Madhya Pradesh. Data was collected using a self-structured question are purposive sampling. Results: Regarding demographic variables majority highest number of respondents were in the age group of 24-29. Majority of the respondent (49%) had higher secondary education. 57% of them were house wives, 42% were belongs to 10,001-15,000 income group, 68% were in Hindu religion, 68% were in nuclear family, 56% were residing in urban area, 32% got information from magazines, newspapers, journals or books and 76% of them had not experienced in institutional delivery before. Conclusion: It was found that self-instructional module was very effective in improving the knowledge of mothers of adolescent girls on knowledge regarding institutional delivery.
Experience and Challenges in Establishing Quarantine Facility for Suspected COVID-19 Cases: Field Briefing
Authors:   Assistant Director, Division of Parasitic Diseases, NCDC, MHFW, Govt. of India, Civil Lines, New Delhi, India, Garg Shubha
Published: October 2021

Introduction: Due to the unprecedented SARS-CoV-2 pandemic, in late January 2020, many countries in the world imposed a travel ban. Governments across the world initiated repatriation operations for stranded nationals. It was important to instantly develop quarantine facilities for evacuees. As the disease was fairly new, data on it was sparse to fulfil the requirement. Objectives: We are sharing our experience of establishing and managing India’s first quarantine facility for repatriate nationals focusing on key parameters including infection prevention and control, environmental cleaning, and bio-medical waste management along with basic living requirements. Results: The facility housed a total of 617 evacuees from China and Italy. Among them, 17 were found to be positive on initial testing and one tested positive on the 14th day of testing. 25 contacts were traced and prescribed an additional quarantine period of fourteen days in the facility, and were discharged accordingly. All evacuees were put on community surveillance. Supply of logistics, manpower management, and ensuring compliance to protocols were some of the major challenges faced, for which appropriate actions were taken. Conclusion: Impeccable collaboration and coordination among different stakeholders is the most essential ingredient for the successful operation of any quarantine facility in the context of the current pandemic.
Effect of food toys on owner-perceived quality of life of cats during a prescribed weight loss plan
Authors: Dodd Lauren E. , Werre Stephen R. , Shepherd Megan L.
Published: October 2021

OBJECTIVE

To determine the effect of a food toy on owner-perceived quality of life (QOL) of overweight cats during a weight loss plan.

ANIMALS

44 adult cats, 1 to 10 years of age with a body condition score (BCS) ≥ 7/9.

PROCEDURES

Cats were randomly assigned to the food toy or food bowl group. Cat owners completed an initial questionnaire and received a prescribed weight loss plan, bag of dry veterinary therapeutic cat food formulated for weight loss, measuring cup, and food bowl or ball-type food toy. Body weight and BCS were checked monthly. Owners completed a monthly questionnaire to assess their cat’s QOL. Low-calorie vegetables were offered to 32 cats whose owners reported disruptive food-seeking behavior.

RESULTS

Of the 44 cats in the final analysis, 29 cats either lost ≥ 2 BCS points or achieved an ideal BCS. Owner-perceived QOL was higher at the final weigh-in, compared with that at the initial weigh-in. An effect of food toy versus food bowl on owner-perceived QOL was not detected. Of the cats offered vegetables, 28 cats would eat the vegetables with a palatability additive; 4 cats ate vegetables plain.

CONCLUSIONS AND CLINICAL RELEVANCE

Owner-perceived QOL was higher at the end of the study. Feeding overweight cats by use of a ball-type food toy did not influence owner-perceived QOL. Low-calorie vegetables can successfully be added to the weight loss diet to promote satiety; albeit, a palatability additive is likely needed. Further studies regarding feeding management for cats during a weight loss plan should be explored.
Breastfeeding and diversification attitudes among Romanian mothers
Authors: Simion Anastasia , Simion Maria , Moldovan Geanina
Published: October 2021

Introduction: Recommended by the World Health Organization as the optimal way of infant feeding, maternal breast milk represents the best nourishment for the newborn baby during its first six months. The purpose of this study was to evaluate some of the Romanian mothers’ characteristics that can influence their attitude towards breastfeeding and food diversification.

Methods: A questionnaire about 32 questions, including demographics items and breastfeeding attitudes, was sent online (socializing platforms) in 2020 to mothers from all Romania districts. Our sample included at the end 1768 subjects, who fully completed the questionnaire. Statistical analysis was carried out using the GraphPad statistical software.

Results: The prevalence of breastfeeding for more than six months was only 32.18% in our group, and most of them were educated mothers who lives in urban areas (OR=2.76), were married (OR=1.98), had over 30 years old (OR=1.43) and have more than one child (OR=1.74).

Conclusions: We underline the importance of tackling in our future community interventions some of the socio-demographic characteristics of pregnant women (like groups education, good and accessible information about breastfeeding, young age, first pregnancy, or mothers from rural areas as well) in developing good habits of breastfeeding or complementary feeding, in order to improve their children health status and proper development.
The Cosine-Sine Functional Equation on Semigroups
Authors: Ebanks Bruce
Published: October 2021

The primary object of study is the “cosine-sine” functional equation f(xy) = f(x)g(y)+g(x)f(y)+h(x)h(y) for unknown functions f, g, h : S → ℂ, where S is a semigroup. The name refers to the fact that it contains both the sine and cosine addition laws. This equation has been solved on groups and on semigroups generated by their squares. Here we find the solutions on a larger class of semigroups and discuss the obstacles to finding a general solution for all semigroups. Examples are given to illustrate both the results and the obstacles.

We also discuss the special case f(xy) = f(x)g(y) + g(x)f(y) − g(x)g(y) separately, since it has an independent direct solution on a general semigroup.

We give the continuous solutions on topological semigroups for both equations.
HUBUNGAN ANTARA KUALITAS TIDUR DENGAN STABILITAS POSTURAL PADA LANSIA DI DESA KUKUH, KERAMBITAN, TABANAN
Authors: Dewanti Ni Kadek Ayu Satya , Saraswati Putu Ayu Sita , Adiputra Luh Made Indah Sri Handari , Linawati Ni Made
Published: October 2021

Lansia merupakan seseorang yang memasuki tahap usia 60 tahun ke atas. Saat memasuki tahap lansia, akan terjadinya proses degeneratif dari perubahan fisik maupun neurologis yang berkaitan dengan masalah kesehatan. Penyebab masalah kesehatan pada lansia salah satunya adalah kualitas tidur yang buruk. Kualitas tidur yang buruk dapat mempengaruhi fungsi sensorimotor pada tubuh lansia sehingga akan berdampak pada stabilitas posturalnya. Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara kualitas tidur dengan stabilitas postural pada lansia di Desa Kukuh, Kerambitan, Tabanan. Desain penelitian adalah observasional analitik dengan pendekatan cross-sectional yang dilakukan pada bulan Februari-April 2021. Pengambilan sampel dilakukan dengan teknik Purposive Sampling. Total sampel penelitian ini sebanyak 66 orang. Variabel independen yang diukur adalah kualitas tidur yang diukur menggunakan Pittsburgh Sleep Quality Index. Variabel dependen yang diukur adalah stabilitas postural yang diukur menggunakan Time Up Go Test. Uji hipotesis yang digunakan adalah chi-square untuk menganalisis hubungan antara variabel independen dengan variabel dependen. Hasil analisis data diperoleh nilai p=0,000 sehingga p<0,05. Berdasarkan hasil penelitian dan uji hipotesis tersebut dapat disimpulkan bahwa adanya hubungan antara kualitas tidur dengan stabilitas postural pada lansia di Desa Kukuh, Kerambitan, Tabanan. Sampel dengan kualitas tidur yang buruk (Global PSQI >=5) lebih dominan memiliki stabilitas postural berisiko jatuh (<=20 detik) dan sangat berisiko jatuh (<=30 detik), sedangkan sampel yang memiliki kualitas tidur yang baik (Global PSQI<5) memiliki stabilitas yang normal (<=10 detik).

Kata kunci: Lansia, Stabilitas Postural, Tidur
HUBUNGAN LATIHAN YOGA SURYANAMASKAR TERHADAP TINGKAT KECEMASAN WANITA PREMENOPAUSE DI KOTA DENPASAR
Authors: Dewi Anak Agung Istri Agung Padmi Swari , Saraswati Ni Luh Putu Gita Karunia , Juhanna Indira Vidiari , Negara Anak Agung Gede Angga Puspa
Published: October 2021

Premenopause merupakan sebuah fase yang pasti dialami oleh setiap wanita sebelum memasuki masa menopause. Ketika memasuki masa premenopause, akan timbul gejala-gejala yang berbeda pada setiap individu salah satunya adalah rasa cemas. Kecemasan merupakan respon emosional yang terdiri dari perasaan khawatir dalam menghadapi situasi tertentu. Sebagian besar orang yang mengalami kecemasan akan merasa gelisah sehingga menyebabkan gangguan tidur dan kesulitan dalam berkonsentrasi. Kecemasan dapat tanggulangi dengan beberapa cara seperti dengan melakukan latihan yoga. Adapun tujuan dilakukannya penelitian yakni untuk mengetahui hubungan latihan Yoga Suryanamaskar terhadap tingkat kecemasan wanita premenopause di Kota Denpasar. Penelitian ini menggunakan studi observasional analitik dengan rancangan cross sectional dan pengumpulan data dilakukan dengan teknik purposive sampling. Penelitian ini dilakukan di wilayah Kota Denpasar pada Desember 2020 – Februari 2021. Jumlah sampel pada penelitian ini sebesar 56 sampel yang disesuaikan dengan kriteria eksklusi dan inklusi. Pengambilan data dilakukan dengan pengisian kuesioner Hamilton Rating Scale for Anxiety (HRS-A) yang digunakan untuk mengevaluasi tingkat kecemasan pada wanita premenopause. Uji hipotesis yang digunakan adalah Kendall’s Tau-b untuk menganalisis hubungan antara Yoga Suryanamaskar dan tingkat kecemasan. Didapatkan dari uji Kendall’s Tau-b bahwa nilai p sebesar 0,02 (p<0,05). Selain itu, diperoleh pula koefisien korelasi dengan nilai -0,309. Berdasarkan hasil olah data, bisa disimpulkan bahwa terdapat hubungan yang signifikan disertai korelasi yang cukup kuat dan tidak searah antara latihan Yoga Suryanamaskar dan tingkat kecemasan wanita usia premenopause di Kota Denpasar.

Kata kunci: yoga suryanamaskar, premenopause, tingkat kecemasan
Myślenie krytyczne w ujęciu psychopedagogicznym — w kierunku poznawczej samodzielności i odpowiedzialności jednostki
Authors: Czaja-Chudyba Iwona
Published: October 2021

Critical thinking in terms of psycho‐pedagogy: towards individual cognitive independence and responsibility: The paper is devoted to the methods of recognition and development of critical thinking. In the initial part synthetically are presented the views of researchers connected with an education perspective (the definition and features of critical thinking). Within this aspect crucial appears the question: why are we afraid of criticism? What are the reasons why we do not apply it in contact with the cultural message, with the opinions and actions of people? For relatively seldom is it used as a support in discussion, in making decisions and choices. In an attempt to answer such formulated problems presented is an outline of the author’s classification for inhibitors that prevent or hinder the application of critical thinking. Here the main claim is that in the modern world of news excess and the chaos of values, critical thinking as a manifestation of cognitive self‐reliance and responsibility should become the competence characterizing each individual. Hence, the author formulates some recommendations concerning pedagogical practice. They are implied from the author’s concept of constructive criticism, the adopted the principles and methods supporting critical thinking.
Refleksja jako źródło autorytetu. Podmiotowość moralna w świetle argumentu konstytutywizmu Korsgaard
Authors: Warmbier Adriana
Published: October 2021

The authority of reflection. Moral agency in the light of Korsgaard’s constitutive arguments: In this paper I address the question as to whether Christine Korsgaard’s account of normative relations between the moral agent and the ends of her actions which constitutes her practical identity avoids falling into the trap of being just another abstract theory in moral philosophy. Proponents of constitutive arguments for the normative authority of reasons for action offer a promising approach to this meta‐ethical question by arguing that the normative authority of reasons is found within the practice of reasoning itself (in agency itself). In two constitutive arguments for the normativity of rational requirements, Korsgaard attempts first to argue that “the normative question” does not consist in looking merely for an explanation of moral practices but in asking “What justifies the claims that morality makes on us?”, and secondly to establish that the reason why ethical standards make claims on us is that they represent commands which are constitutive of having a self (the cost of violating ethical standards is the loss of practical identity). Korsgaard deals with these two arguments using her own modified version of the reflective endorsement method. She claims that the reflective structure of human consciousness establishes the normative relation we have to ourselves and that this is a relation of authority (that is the source of obligation). I argue that Korsgaard’s account of action as self‐constitution (the constitution of a practical sense of identity) fails to arrive at establishing the authority of reflection. I draw on the discussed claim that reasoned authority for our actions comes from reflective scrutiny (the test of reflection). Viewing the Kantian model of practical reason which lies at the basis of Korsgaard’s approach, I suggest the possibility of applying the Aristotelian model of practical reason as an useful framework for the reflective endorsement strategy.
Body and image
Authors: Popczyk Maria
Published: October 2021

In aesthetics, as a philosophy of art, the body of the viewer is juxtaposed with the image of the painting, before which it stands still; both body and image are considered to be independent, which is a condition of a full aesthetic experience. In the present article I demonstrate how, through phenomenology, pragmatism and the idea of incarnation, post‐Kantian aesthetic is broadened. I limit myself to three theoretical perspectives; in each of them the duality of body and image is neutralised according to different rules. Phenomenology develops the relations between consciousness and body, while in pragmatism the encounter of body and image takes place in the process of the performative creation of image. The idea of incarnation, on the other hand, develops both of these currents in two divergent approaches: a theological and an anthropological one. Bringing together perspectives, which are so different methodologically reveals the existence of a profound tie between body and image.
MOTIVASI SISWA DALAM MENGIKUTI PEMBELAJARAN PENDIDIKAN JASMANI OLAHRAGA DAN KESEHATAN (PJOK)
Authors: Devi Devi , Syaiful Bahri  , Ahmad Shiddiq
Published: October 2021

Adapun tujuan dari penelitian ini adalah untuk mengetahui seberapa besar motivasi siswa kelas V SDN Marengan Laok II  Kecamatan Kalianget Kabupaten Sumenep terhadap pembelajaran pendidikan jasmani olahraga dan kesehatan. Penelitian ini merupakan penelitian deskriptif. Metode yang digunakan adalah metode survei. Instrumen yang digunakan dalam penelitian ini adalah angket dengan skala Guttman atau skala dikotomi. Subjek penelitian yang digunakan adalah siswa kelas V SDN Marengan Laok II  yang berjumlah 52 siswa. Untuk menganalisis data digunakan statistik deskriptif dengan persentase. Hasil penelitian motivasi siswa kelas V SDN Marengan Laok II  Kecamatan Kalianget Kabupaten Sumenep dalam Mengikuti Pembelajaran Pendidikan Jasmani Olahraga dan Kesehatan secara keseluruhan diperoleh hasil pada kategori sangat tinggi 8 % (4 siswa), pada kategori tinggi diperoleh hasil 30 % (15 siswa), pada kategori sedang 24 % (12 siswa) pada kategori rendah 30 % (15 siswa) dan pada kategori sangat rendah 8% (4 siswa). Jadi dapat disimpulkan motivasi siswa kelas V SDN Marengan Laok II  Kecamatan Kalianget Kabupaten Sumenep dalam Mengikuti Pembelajaran Pendidikan Jasmani Olahraga dan Kesehatan adalah sedang.
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
Terapi Dzikir Jahar Mengurangi Kecemasan Pada Ibu Pre Operasi Sectio Caecarea
Authors: Satriyawati Arisda Candra , Hidayat Syaifurrahman , Wardita Yulia , Arifah Nor
Published: October 2021

Dhikr Jahar Therapy Reduces Anxiety in Pre-Operative Sectio Caesarea Mothers. Mothers often experience anxiety before cesarean section surgery. Non-pharmacological therapy with dhikr Jahar can be a complementary therapy option to reduce anxiety. This study aimed to explain the effect of dhikr therapy on reducing maternal anxiety levels before SC surgery. The research method uses Quasy Experiment with Pre-Post Test With Control Group Design. The respondents' determination was carried out by total sampling, namely pre-cesarean section surgery pregnant women in March-June 2019 at Garam Islamic Hospital, Kalianget (n=24). Statistical test using Paired T-Test, Wilcoxon Test, and Independent T-Test. The results of the Paired T-Test showed that there were differences in the level of anxiety of patients before SC before and before being given dhikr therapy in the intervention group (p = 0.000); there was an average decrease of 9.917. The Wilcoxon test results showed no difference (change) in the level of anxiety of patients before and before being given therapeutic communication in the control group the value (p = 0.636); the decrease that occurred was 0.83. In the Independent T-Test results, there was no difference in the level of anxiety before SC before and before being given treatment in the intervention group and the control group (p = 0.211). There is an effect of providing dhikr Jahar therapy to reduce maternal anxiety levels before SC surgery.
The problem of optimal selection of methods for studying everyday legal awareness in the Russian folk tales
Authors: Popova Iuliia
Published: October 2021

This article is dedicated to problem of optimal selection of methods for studying everyday legal awareness in the Russian folk tales. Attention is turned to the complexity of such choice due to intricacy of the empirical base. The article provides an overview of the study of Russian folk tales by the representatives of various sciences: philology, folklore studies, philosophy, culturology, and psychology. The author believes that the methods of analysis (criticism) of the written sources, generalization, comparison, and specific historical methods are optimal on the empirical stage of research. On the theoretical stage, these are the methods of abstraction, analysis, system-structural method, induction, deduction, sociocultural approach. Hermeneutical and phenomenological methods rather carry significant risks. The author demonstrates the advantages of “morphological analysis” of tales proposed by V. Y. Propp. The author outlines the result of studying the legal phenomena in the Russian folk tales, namely acquisition of objective, reliable and scientifically proven knowledge on the system of natural correlation between the reflection and translation of legal ideas of the early period in the Russian tales, as well as on the inverse determining links between legal ideas of the early period and their reflection in folklore. The article provides the original definition of legal archetype as an element of the collective unconscious, which represents a prototype of the ideas on justice, norm and extent, reward, freedom, property, essence of agreement and its force, power, and judgment. The conclusion is made that the plotline of the Russian folk tales reflect the process of establishment of legal awareness based on individualization of self-consciousness of a person. At the same time, the sociocultural approach towards studying the phenomenon of tales is considered central, since the described in Russian folk tales sociocultural reality is the determinant of the development of law in the objective sense.
Anton Chekhov Theater in the perception of Harbin Russians
Authors: Khabarova Iuliia
Published: October 2021

This article examines the criticism and publicistic writing about A. P. Chekhov’s dramaturgy and theatre conducted by the Harbin Russians in the early XX century. Russian immigrants of that time did not break ties with the native culture seeing it as a source of spiritual revival and hopes for returning to Russia. Chekhov was an integral part of their intellectual and cultural life. The ideological and aesthetic views of Harbin Russians resonated with the views of Western immigrants, although indicating certain differences. The publications of Eastern immigrants rarely contain skeptical arguments about Chekhov's role in the hierarchy of classics; for Harbin Russians, Chekhov resembles the pride of the Russian literature. The author analyzes the most characteristic articles, considering the fact that they were published in newspapers “on the occasion”. The conclusion is made that the topic  of “Eastern Immigration and the Chekhov” is poorly studied, which defines its scientific relevance, contributes to more extensive coverage of literary heritage of the white émigré, and enriches the knowledge on personality of the writer, his prose, and theater.
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.