bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of the strength of vertical cylindrical liquid storage tanks with dents in the wall
Authors: Suleimenov Ulanbator , Zhangabay Nurlan , Utelbayeva Akmaral , Azmi Murad Masrah Azrifan , Dosmakanbetova Aibarsha , Abshenov Khassen , Buganova Svetlana , Moldagaliyev Arman , Imanaliyev Kuanysh , Duissenbekov Bolat 
Published: March 2022

A multi-level mathematical model was used to estimate the stressed-strained state of a cylindrical reservoir with a defect in the wall shape in the form of a dent; the concentration of stresses in the defect zone was studied.
The proper choice of the mathematical model was verified; it has been shown that the engineering assessment of the stressed-strained state of the wall of a cylindrical tank with the variable thickness could employ ratios for a cylindrical shell with a constant wall thickness. The spread of values is 2‒10 %. This indicates the proper choice of the mathematical model, as well as the fact that it is possible, for an engineering assessment of the stressed-strained state of the wall of a cylindrical tank with variable thickness, to use the ratios for a cylindrical shell with a constant wall thickness.
The stressed-strained state of the dent zone in the tank wall was numerically estimated, which proved the assumption of significant stress concentrations in the dent zone and indicated the determining effect on the concentration of stresses in the dent zone exerted by its geometric dimensions and its depth in particular.
The concentration of stresses in the zone of dents in the tank wall was investigated in the ANSYS programming environment at different sizes of dents on the tank wall, for which two dimensionless parameters were introduced: the dimensionless radius of the dent and the dimensionless depth of the dent.
Based on the results of a numerical study into the stressed-strained state of the dent zone in the tank wall, graphic dependences were derived of the stress concentration coefficient on the dimensionless depth of the dent for various values of the dimensionless radius of dents, which does not exceed 2 % of the indicator.
Based on fitting the stress concentration curves on the dimensions of the dent and tank, a formula was derived for calculating the stress concentration coefficient as a function of the dimensionless radius ξ and the dimensionless depth ς of the dent. The resulting formula makes it possible, with known dimensionless parameters of the depth and radius of the dent, to determine the coefficients of stress concentration in the dented zone of the tank wall.
Identifying the influence of transfer learning method in developing an end-to-end automatic speech recognition system with a low data level
Authors: Mamyrbayev Orken , Alimhan Keylan , Oralbekova Dina , Bekarystankyzy Akbayan , Zhumazhanov Bagashar 
Published: March 2022

Ensuring the best quality and performance of modern speech technologies, today, is possible based on the widespread use of machine learning methods. The idea of this project is to study and implement an end-to-end system of automatic speech recognition using machine learning methods, as well as to develop new mathematical models and algorithms for solving the problem of automatic speech recognition for agglutinative (Turkic) languages.
Many research papers have shown that deep learning methods make it easier to train automatic speech recognition systems that use an end-to-end approach. This method can also train an automatic speech recognition system directly, that is, without manual work with raw signals. Despite the good recognition quality, this model has some drawbacks. These disadvantages are based on the need for a large amount of data for training. This is a serious problem for low-data languages, especially Turkic languages such as Kazakh and Azerbaijani. To solve this problem, various methods are needed to apply. Some methods are used for end-to-end speech recognition of languages belonging to the group of languages of the same family (agglutinative languages). Method for low-resource languages is transfer learning, and for large resources – multi-task learning. To increase efficiency and quickly solve the problem associated with a limited resource, transfer learning was used for the end-to-end model. The transfer learning method helped to fit a model trained on the Kazakh dataset to the Azerbaijani dataset. Thereby, two language corpora were trained simultaneously. Conducted experiments with two corpora show that transfer learning can reduce the symbol error rate, phoneme error rate (PER), by 14.23 % compared to baseline models (DNN+HMM, WaveNet, and CNC+LM). Therefore, the realized model with the transfer method can be used to recognize other low-resource languages.
Determination of the influence of the choice of the pruning procedure parameters on the learning quality of a multilayer perceptron
Authors: Galchonkov Oleg , Nevrev Alexander , Shevchuk Bohdan , Baranov Nikolay 
Published: March 2022

Pruning connections in a fully connected neural network allows to remove redundancy in the structure of the neural network and thus reduce the computational complexity of its implementation while maintaining the resulting characteristics of the classification of images entering its input. However, the issues of choosing the parameters of the pruning procedure have not been sufficiently studied at the moment. The choice essentially depends on the configuration of the neural network. However, in any neural network configuration there is one or more multilayer perceptrons. For them, it is possible to develop universal recommendations for choosing the parameters of the pruning procedure. One of the most promising methods for practical implementation is considered – the iterative pruning method, which uses preprocessing of input signals to regularize the learning process of a neural network. For a specific configuration of a multilayer perceptron and the MNIST (Modified National Institute of Standards and Technology) dataset, a database of handwritten digit samples proposed by the US National Institute of Standards and Technology as a standard when comparing image recognition methods, dependences of the classification accuracy of handwritten digits and learning rate were obtained on the learning step, pruning interval, and the number of links removed at each pruning iteration. It is shown that the best set of parameters of the learning procedure with pruning provides an increase in the quality of classification by about 1 %, compared with the worst set in the studied range. The convex nature of these dependencies allows a constructive approach to finding a neural network configuration that provides the highest classification accuracy with the minimum amount of computational costs during implementation.
Monitoring and management ion concentrations in the air of industrial and public premises
Authors: Bolibrukh Borys , Glyva Valentyn , Kasatkina Natalia , Levchenko Larysa , Tykhenko Oksana , Panova Olena , Bogatov Oleg , Petrunok Tetiana , Aznaurian Iryna , Zozulya Sergey 
Published: March 2022

This paper reports a substantiated method and a designed device for controlling the concentrations of air ions in premises in accordance with the European standards SBM 2015. The use of an ultrasonic humidifier with a capacity of 25 W for two hours increases the concentration of negative ions around the device from 240 to 560 cm-3, positive ones ‒ from 260 to 410 cm-3. The intensity of the electrostatic field of a polymeric coating decreases from 5.1 to 0.2 kV/m. The disadvantage of the humidifier is a small radius of influence (1.0–1.5 m) and the inability to control the polarity of ions. It has been experimentally established that air cooling systems (split systems) deionize the air of the premises. Degrees of deionization and dominating polarity are unpredictable and different for devices of different manufacturers and brands. To control the ion composition of the air simultaneously with the maintenance of normative relative humidity and stresses of static fields, the structure was proposed and the effectiveness of a bipolar ultrasonic air ionizer with adjusted performance and dominating polarity has been tested. The maximum productivity of the ionizer is 4,000–5,000 cm-3. The radius of exposure is 5 m (reducing the concentration of ions with a distance to 500 cm-3). To pass the ionized air through an air capacitor, the number and predominant polarity of air ions are regulated by the polarity and voltage on the covers of the capacitor. It was established that in order to service a room with an area of 50 m2, an ultrasonic emitter with a capacity of 25 W would suffice. The adjustability of the device performance makes it possible to reduce or increase the service area. The ability to purify air from suspended particles is shown. During the two hours of operation of the ionizer, the dust content decreased from 4.3–4.4 mg/m3 to 1.4–1.6 mg/m3.
Immunohistochemical diagnosis and prognosis of small cell lung cancer: the search for new strategies
Authors: Yakovtsova Irina , Yanchevskyi Olexandr , Chertenko Taisiia , Kis Andriy , Oliyinyk Andrii 
Published: March 2022

The aim: to find the optimal combination of immunohistochemical markers for differential diagnosis and prognosis of small cell lung cancer in small biopsy samples.
Materials and methods. The tumor specimens were divided into 3 groups: 1) 25 biopsy samples of small cell lung cancer before treatment; 2) 25 samples of small cell lung cancer procured from autopsies of patients, who underwent chemotherapy; 3) 15 biopsy samples of other lung tumors histologically similar to SCLC. All tumor samples were formalin fixed and paraffin embedded (FFPE). Immunohistochemical study performed with 5 primary antibodies: CD56, p16ink4A, TTF-1, CD117, Ki-67.
Results. TTF-1 was positive in all small cell lung cancer, lung adenocarcinomas and atypical carcinoids. Expression of CD56 was positive in 100 % of tumors from 1st group and 92 % of these tumors had more than 25 % of positive tumor cells. Expression of p16ink4A was significantly higher in 1st group than in the 3rd one (р<0,001). The stepwise logistic regression was used for finding the best markers for differential diagnosis of small cell lung cancer in small biopsy samples. The next combination of markers was chosen: TTF-1/CD56 (score 2–4)/p16 ink4A/CD117 (sensitivity – 80 %; specificity – 86.67 %; р<0,001) where “score 2–4” means expression of CD56 more than in 25 % tumor cells. Expression of Ki-67 was higher in the 2nd group compared with the 1st one (р<0,001).
Conclusion. Evaluation of p16 expression can be used as additional marker for differential diagnosis of small cell lung cancer. The following combination of markers: TTF-1/CD56 (score2-4)/p16 ink4A/CD117 could be useful in diagnosis of small cell lung cancer in small biopsy samples and in the choice of targeted chemotherapy. The further study in paired tumor samples of small cell lung cancer before and after chemotherapy is required to prove the significance of changes in expression of Ki-67, CD56, CD117 and p16ink4A
Carboxylic acids in the flowers of Veronica spicata L. and Veronica incana L.
Authors: Kovaleva Аlla , Ain Raal , Tetiana Ilina , Osmachko Alina , Goryacha Olga , Omelyanchik Ludmila , Koshovyi Oleh 
Published: March 2022

In the Ukrainian flora, species of Veronica L. genus (Plantaginaceae Juss.) are classified into 8 sections. Among the representatives of Pseudolysimachion W. D. J. Koch section in the Kharkiv region, Veronica spicata L. (spike speedwell) and Veronica incana L. (Veronica spicata L. subsp. incana (L.) Walters, silver speedwell) are common. Plants are used for the treatment of upper respiratory tract diseases, malignant neoplasms, gastrointestinal tract and genitourinary system disorders, diabetes mellitus.
The aim of the research was to study the carboxylic acids of flowers of Veronica spicata L. and Veronica incana L.
Materials and methods. The objects of the research were flowers of Veronica spicata L. and Veronica incana L., collected in the flowering stage in the Botanical Garden of Karazin University (Kharkiv, Ukraine) in summer 2018. The study of carboxylic acid composition was performed by chromatography-mass spectrometry on a 6890N MSD/DS Agilent Technologies chromatograph with a 5973N mass spectrometric detector. Identification of methyl esters of acids was performed using data from the mass spectrum libraries NIST 05 and Willey 2007 in a combination with programs for the identification of AMDIS and NIST; also, their retention time and the retention times of standard compounds were compared.
Results. In Veronica incana L. flowers, 37 carboxylic acids were identified and quantified, constituting 1.05 %. In Veronica spicata L. flowers, 32 carboxylic acids were identified and quantified, the total content of which was 2.75 %.
Conclusions. A higher carboxylic acid content was established in the flowers of Veronica spicata L. The fatty acid composition of Veronica incana L. flowers is characterized by a comparable content of saturated and unsaturated acids, while in Veronica spicata L. flowers, unsaturated fatty acids prevail over saturated fatty acids. The content of aromatic acids in the flowers of studied species was comparable. The characteristic carboxylic acids in the flowers of Veronica incana L. are oxalic, 3-hydroxy-2-methylglutaric, pentadecanoic, heneicosanoic, tricosanic,4-hydroxybenzoic, 4-methoxybenzoic and 3,4-dimethoxybenzoic acids; in the flowers of Veronica spicata L. – 2-hydroxy-3-methylglutaric, α-furanic and homovanillic acids
Development of a mathematical model of radio resource management of special purpose radio communication systems based on an evolutionary approach
Authors: Shyshatskyi Andrii , Ovchynnyk Volodymyr , Momotov Andrii , Protas Nadiia , Solomakha Andriy 
Published: March 2022

The object of research is a special-purpose radio communication system. A special purpose radio communication system is affected by many different destructive influences. The main ones are deliberate interference and cybernetic impact of various purposes. The above causes the search for new scientific approaches to identify and identify the destructive impact on special-purpose radio communications in order to increase the operational efficiency of special-purpose radio communications systems. In this work, the problems of developing a mathematical model for managing the radio resource of special-purpose radio communication systems based on the evolutionary approach are solved.
In the course of the research, the authors of the work used the main provisions of the theory of artificial intelligence, the theory of automation, the theory of complex technical systems, as well as general scientific methods of cognition, namely analysis and synthesis. The proposed methodological approach was developed taking into account the practical experience of the authors of this work during military conflicts of the last decade.
The research results will be useful for:
– development of new radio resource management algorithms;
– substantiation of recommendations for improving the efficiency of radio resource operational management;
– analysis of the radio-electronic situation during the conduct of hostilities (operations);
– when creating promising technologies for increasing the efficiency of radio resource operational management;
– assessment of the adequacy, reliability, sensitivity of the scientific and methodological apparatus for the operational management of the radio resource;
– development of new and improvement of existing radio resource management models.
Directions for further research will be aimed at developing a methodology for intelligent control of the radio resource of special-purpose radio communication systems.
Complex Approach to Diagnosis of Nasal Cavity and Nasopharyngeal Pathologies in Children. Initial Results
Authors: Namazova-Baranova Leyla S. , Gankovskiy Viktor A. , Zelenkova Irina V. , Gubanova Svetlana G. , Pashkov Alexander V. , Karkashadze George A. 
Published: March 2022

Background. Nasal cavity and nasopharyngeal pathology are crucial and common issue in pediatric otorhinolaryngology. One of the major reasons for the nasal breathing difficulties are adenoids, allergic rhinitis, acute rhinitis, rhinosinusitis, nasal septum deviation. All these diseases can occur individually and in combination with each other, while clinical signs can be similar.Objective. The aim of the study is study and estimate the condition of nasal breathing and sense of smell in children with different nasal and nasopharyngeal pathology.Methods. The study included 128 children, all children were divided into 3 groups comparable by gender and age. Children with confirmed acute ENT organ disease were included in the 1st group, children with allergic disease exacerbation were included in the 2nd group, and clinically healthy children (control group) were included in the 3rd group. Survey methodology: rhinomanometry (RMM), rhinoresistometry (RRM), olfactometry.Results. It was revealed that nasal resistance in children with allergic diseases exacerbation is significantly higher both before and after anemisation of nasal mucosa with a solution of nasal decongestants than in children of the control group (according to the RRM). The air flow rate increases by average of 25% in children with various ENT organs diseases, and in children with allergic diseases — by average of 43% after anemisation of the nasal mucosa. The obtained data shows the role of nasal mucosal edema in patients with allergic diseases during exacerbation. Analysis of our RMM and RRM data suggests the importance of further use of these methods in children.Conclusion. The obtained results will allow us to optimize the diagnosis approach and personalize the management of patients with various nasal cavity and nasopharynx pathologies. Nowadays, the study is ongoing.
Gluten-Free Diet in Children with Dermatologic Pathology
Authors: Opryatin Leonid A. , Borovik Tatiana E. , Murashkin Nikolay N. 
Published: March 2022

Background. Gluten-free diet (GFD) is a nutritional pattern that excludes such component of grain crops as gluten. This diet administration should be strictly regulated due to its influence on the growing child nutritional status and on the course of skin diseases. Thus, studying the effects of GFD on the course of dermatologic diseases in various patients’ groups is crucial.Objective. The aim of the study is to study the effects of GFD on nutritional status and skin condition of patients with dermatologic pathology and associated celiac disease, as well as gluten hypersensitivity.Methods. The study included children hospitalized in the dermatology department. We have used obtained anthropometric data (weight, height, body mass index (BMI)) to estimate nutritional status, all calculations were performed via programs WHO Anthro (for children under 5 years old) and WHO AntroPlus (for children over 5 years old). Weight-for-age (WAZ), height-for-age (HAZ), BMI-for-age (BAZ) z-scores were evaluated. Estimation of skin pathological process was performed via SCORAD index for patients with atopic dermatitis, PASI — for psoriasis, SALT — for alopecia, VASI — for vitiligo, LoSCAT — for scleroderma. Assessment of anthropometric measures and skin disease severity was performed at study initiation and 6 months after nutrition correction.Results. 1000 children with various dermatologic pathologies admitted to the dermatology department during the period from August 2020 to August 2021 were examined. Three patients’ groups were formed: with celiac disease, gluten hypersensitivity, and without any gluten-associated conditions. Assessment of anthropometric measures has shown positive dynamics in patients with celiac disease and gluten hypersensitivity on GFD, as well as in patients without any gluten-associated conditions on normal caloric diet according to age norms. All three groups have shown positive dynamics for skin pathologies.Conclusion. Estimation of nutritional status and skin conditions on various stages of the study has shown the importance of differentiated approach in GFD administration in dermatologic patients.
Modern Treatment Principles for Children with Primary Intestinal Lymphangiectasia: Observational Studies Systematic Review
Authors: Shukenbaeva Regina A. , Turti Tatiana V. 
Published: March 2022

Background. Primary intestinal lymphangiectasia (PIL) is severe and rare disease with poor prognosis. Its management is complex due to the lack of clinical guidelines (both Russian and international). Therefore, consideration of modern principles of this pathology treatment is still crucial, it also can improve the quality and life expectancy in these patients.Objective. The aim of the study is to schematize and unify all relevant data on PIL cases over the past 10 years, to identify modern treatment principles for provision of timely medical car. Methods. Systematic review of publications from 2011 to 2021 in PubMed database was performed. Clinical cases, observational studies, and literature reviews were included.Results. Nutrition therapy in the treatment of PIL has many advantages and it is the firstline therapy. However, modern medicine allows to help children with this pathology via somatostatin group drugs, immunosuppressants, and surgery in case of insufficient nutrition correction.Conclusion. Primary intestinal lymphangiectasia has certain scientific interest in pediatricians and gastroenterologists’ practice. Understanding of the disease, its early diagnosis and pathological process localization allow us to choose the correct diet, to determine the need for surgical intervention, and to prescribe targeted drug therapy.
COVID-19 Morbidity in Children with Bronchial Asthma and Allergies
Authors: Kobzeva Elizaveta A. , Levina Julia G. 
Published: March 2022

Background. The morbidity of new coronavirus infection remains high (in children as well). Children with bronchial asthma are not at risk this disease development and severe course of COVID-19 according to the previous studies results.Objective. The aim of the study is to compare the morbidity rate of COVID-19 among children with and without bronchial asthma between May 2020 and October 2021 with the results from the beginning of pandemics. Methods. Online questionnaires in Google form have been developed and sent to parents of 83 patients aged from 7 to 17 years who have been interviewed at the beginning of the pandemics. The main group includes 49 patients diagnosed with bronchial asthma, and the control group includes 25 children without bronchial asthma.Results. 45% (22) of patients had COVID-19 in the main group and 32% (8) — in the control group (p = 0.636). 80% of patients had mild course of disease and 20% — moderate in the main group, and 62% and 37% in the control group respectively. Febrile fever was observed in 40% of respondents in the main group and in 33% — in the control group; anosmia — in 35% in the main and in 14% — in the control group; pulse oximetry was used by 44% of patients in the main group (SpO2 94–98%) and 42% in the control group (SpO2 98–99%); 66% of patients had baseline therapy and 6% had rescue medications in the main group. No one from both groups has been hospitalized.Conclusion. Pediatric patients both with and without bronchial asthma have COVID-19 more often compared to the pandemics beginning. The disease in most cases had mild course and did not require hospitalization, aggravations of bronchial asthma were rare, and saturation values did not decrease below 94%.