bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of the mental fatigue state of an operator influenced by electromagnetic noise radiation
Authors: Sidorenko A. V. , Saladukha M. A. 
Published: January 2022

Objectives. The problem of determining the mental fatigue of the operator, which is processing the confidential information under the influence of electromagnetic noise radiation, is solved. The relevance of the problem is associated with the need to process the confidential information by the operator located in the limited space of a mobile technical system.Methods. The methods of spectral analysis theory of the results, received in the process of experimental studies the electroencephalograms, are used.Results. The results of experimental studies were obtained based on the processing and analysis of electroencephalograms recorded in standard leads Fp1, Fp2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T3, T4, T5, T6. The following quantitative parameters have been analyzed: power spectral density of delta-, theta-, alpha-, beta-, gamma-rhythms under the influence of electromagnetic noise radiation.Conclusion. The presence of mental fatigue of the operator is based on a comparative analysis of the obtained results and the data described in the scientific literature related to the occurrence of chronic mental fatigue; the fatigue caused by the military performing simulation tasks; mental fatigue caused by performing an RVP test.
Optimization of the PID coefficients for the line-follower mobile robot controller employing genetic algorithm
Authors: Kim T. Yu. , Prakapovich R. A. 
Published: January 2022

O b j e c t i v e s. To develop a control system for the movement of a mobile robot along a color-contrast line, as well as to find the values of the coefficients of a proportional-integral-differentiating (PID) controller that allows the robot to move along the line at a given speed.M e t ho d s. To adjust the values of the coefficients of the PID controller, methods of enumeration, automatic tuning and a genetic algorithm are used.Re s u l t s. A software package for tuning the PID controller of the educational mobile robot RoboCake, designed to move along a closed color-contrast line at a given speed, has been developed. The software package consists of a simulation model of the specified robot in the Simulink environment, several virtual traces-polygons and a specialized solver based on the developed genetic algorithm. With the help of the proposed fitness function, a mobile robot control system that satisfies the stated conditions is implemented. Based on the conducted model experiments, the desired values of the parameters of the PID controller are obtained.Co n c l u s i o n. A comparison of the effectiveness of various methods of tuning the PID controller is carried out. The developed software package is designed to solve the practical problem of moving a mobile robot along a color-contrast line at a speed of 1 m/s. The results obtained can be used to study methods of evolutionary tuning of stabilization systems for transport robots, ensuring their movement without overshoot.
Approach to optimizing charging infrastructure of autonomous trolleybuses for urban routes
Authors: Kovalyov М. Ya. , Rozin B. M. , Shaternik I. A. 
Published: January 2022

P u r p o s e s. When designing a system of urban electric transport that charges while driving, including autonomous trolleybuses with batteries of increased capacity, it is important to optimize the charging infrastructure for a fleet of such vehicles. The charging infrastructure of the dedicated routes consists of overhead wire sections along the routes and stationary charging stations of a given type at the terminal stops of the routes. It is designed to ensure the movement of trolleybuses and restore the charge of their batteries, consumed in the sections of autonomous running.The aim of the study is to create models and methods for developing cost-effective solutions for charging infrastructure, ensuring the functioning of the autonomous trolleybus fleet, respecting a number of specific conditions. Conditions include ensuring a specified range of autonomous trolleybus running at a given rate of energy consumption on routes, a guaranteed service life of their batteries, as well as preventing the discharge of batteries below a critical level under various operating modes during their service life.M e t ho d s. Methods of set theory, graph theory and linear approximation are used.Re s u l t s. A mathematical model has been developed for the optimization problem of the charging infrastructure of the autonomous trolleybus fleet. The total reduced annual costs for the charging infrastructure are selected as the objective function. The model is formulated as a mathematical programming problem with a quadratic objective function and linear constraints.Co n c l u s i o n. To solve the formulated problem of mathematical programming, standard solvers such as IBM ILOG CPLEX can be used, as well as, taking into account its computational complexity, the heuristic method of "swarm of particles". The solution to the problem is to select the configuration of the location of the overhead wire sections on the routes and the durations of charging the trolleybuses at the terminal stops, which determine the corresponding number of stationary charging stations at these stops.
THE ROLE OF THE INSTUMENTAL EXAMINATIONS IN DIAGNOSTICS AND STAGING OF LOCALY DISTRIBUTED STOMACH CANCER
Authors: Lazirskiy V. A. , Farzullayev N. N. 
Published: January 2022

Objective. Improvement of algorithm of diagnostics of patients with complicated stomach cancer.
Materials and methods. It was shown the analysis of results of surgical treatment of 418 patients with complicated stomach cancer, which got the hospital treatment at GI “V.T. Zaycev Institute of General and Urgent Surgery of NAMS of Ukraine “ from 2010 till 2019, aged 29 till 76.
Results. Patiens were examinated with using of combination of instrumental methods. Goal is total detal examination of pathologic process. SCT has precission of 95-97 % at detecting of cancer, definition of stage – 77-80 %. Endoscopy allows to define the location, spreading of process, to find a pathologic process at starting and precancer stages. There no any ideal oncomarker. Diagnostic precission of CA 72-4 is 28-80 % (40-46 % on the average). According to international guides [7], all patients were performed the diagnostic laparoscopy with researching of washout liquids of abdomen in uncertain cases.
Conclusion. Only complex examination of patients with stomach cancer with using combination of SCT of abdomen, FEGDS with biopsy, laparoscopy can provide total volum of examination, staging and surgical aid.
SELECTION OF SURGICAL TACTICS FOR TREATMENT OF NON-APHENIC VARICOSIS ON THE RESULTS OF US-DIAGNOSTICS OF THE VENES OF THE LOWER LIMBS
Authors: Novikova A. , Babinkina I. B. , Babinkina G. P. , Provar L. V. , Golovina О. A. 
Published: January 2022

Purpose of research. Determination of variants of the anatomical structure of non-saaphenic veins and pathological anastomoses in varicose enlargement of atypical venous basins with ultrasound Doppler of the veins of the lower extremities, including as sources of pathological venous reflux, as well as the importance of insolvent veins — perforants and non-saaphenic veins — in the formation of venous insufficiency to clarify the treatment protocol.
Materials and methods. The venous system was studied in 2348 pa tients, including both patients with various pathologies of the venous system, including those with varicose veins, and those in whom the pathology of the veins was not detected by Doppler ultrasound.
Research results and discussion. Surgical treatment for non-safenic varicose veins includes phlebectomy, sclerotherapy and Muller-Vara di minifblektomy, depending on the diameter of the affected nonsafenic vein.
Conclusions. The specialists’ understanding of the variants of nonsafenic varicose veins, as well as adherence to the full research protocol for ultrasound Doppler ultrasound of the veins, allows us to provide detailed information in order to determine the most effective treatment tactics and prevention of relapses and complications of the disease.
EXPERIMENTAL STUDY OF CLINICAL INDICATORS OF INTRATISSUE PRESSURE IN DEEP CIRCULAR BURNS AND ITS DYNAMICS DEPENDING ON THE NATURE AND VOLUME OF SURGERY
Authors: Kravtsov O. V. , Kurbanov T. A. , Kozin Yu. I. 
Published: January 2022

The purpose of research. To improve in the experiment the optimal variants of surgical tactics to eliminate the phenomena of compartment syndrome in circular deep burns on the basis of studying the dynamics of intratissue pressure.
Materials and methods. An experiment to study the effectiveness of treatment of deep circular burns of III degree, accompanied by compartment-syndrome with objectification of intra-tissue pressure was performed on 18 male WAG rats weighing 190.0-200.0 g, which were divided into three groups depending from the nature and scope of surgery.
Research results and their discussion. Based on the assessment of the dependence of the level of intratissue pressure in the tissues on the timing of modeling of deep circular burns in the experiment and tactics and volume of surgical treatment, a clear dependence of indicators in all groups of experimental animals. The primary necrectomy performed in the III main group due to the radical surgical intervention allowed to completely normalize the intratissue pressure within 24 hours.
Conclusions. 1. Clinical indicators of intratissue pressure at deep circular burns depending on time of modeling of a thermal trauma and character and volume of surgical intervention are defined in experiment. 2. It is established that primary necrectomy due to radical excision of necrotized tissues and rapid decompression contributes to the nor malization of intratissue pressure.
SURGICAL TREATMENT OF PATIENTS WITH EXTRAORGANIC TUMORS OF THE PELVIC LOCALIZATION WITH INVASION OF THE ILIAC VESSELS
Authors: Kryvorotko I. V. , Chykin A. V. , Tymchenko M. Ye. , Beresnyev S. O. , Alexandrov T. Z. 
Published: January 2022

The aim of our study was to determine the indications for expanding the scope of operations in patients with pelvic extraorgan local formations.
Materials and methods. The results of surgical treatment of 7 patients with nonorgan tumors of the pelvic localization, who underwent resection on the main vessels in connection with their involvement in the tumor process, are presented.
Results and discussion. A total of 7 interventions were performed on the iliac arteries — 2 resections with an end-to-end anastomosis and 5 prostheses (one case — the aorta resection with reconstruction with a bifurcation prosthesis).
Patients with pelvic extraorgan tumors are a special cohort of patients, due to the presence of several organs in a narrow space, which inevitably causes them to fit snugly to the tumor. Locally advanced tumor process in extraorganic tumors involving the main vessels of the pelvis and adjacent organs is not a reason to refuse surgery, and despite the complications, repeated recurrences and previous operations, are well tolerated by patients. This is especially important due to the lack of a real alternative to surgical treatment of this group of patients.
Conclusions. Surgical intervention in the treatment of pelvic inorganic tumors involving the main vessels is the only radical method of treatment. Invasion of the main arterial and venous vessels is not a contraindication to surgery in patients with pelvic tumors. Combined angioplastic interventions allow to achieve a long without recurrent period even after cytoreductive operations.
FEATURES OF SURGICAL TREATMENT OF GALLSTONE DISEASE AND PREVENTION OF ITS COMPLICATIONS
Authors: Kryzhevskii V. V. , Bilyayeva O. O. , Pavlovych Yu. V. 
Published: January 2022

The aim. To analyze the results of surgical treatment of gallstone disease (GD), methods of prevention of complications.
Materials and methods. To analyze the results of surgical treatment of gallstone disease (GD), methods of preventing complications.
Results and discussion. The data of 204 patients with GD who underwent laparoscopic cholecystectomy (LC) at the Kiev City Hospital No. 6 and the Medical Center “Universal Clinic Oberig” for 2018 were analyzed.
Conclusions. The only radical method of treatment of CD is LC. To reduce the complications of LC, it is necessary to conduct the correct selection of patients and apply bail-out strategies to overcome complex LHE.
DETERMINATION OF PAIN IN PATIENTS WITH ACUTE CALCULOUS CHOLECYSTITIS IN PATIENTS WITH CHRONIC HEPATITIS
Authors: Kolotvin A. O. , Kashtalyan M. A. , Kolotvina L. I. , Kvasnevsky O. A. , Kvasnevsky E. A. , Illina-Stognienko V. Yu. 
Published: January 2022

The aim. To establish the diagnostic value of the scale for assessing the severity of pain by determining the intensity of pain in patients with acute calculous cholecystitis in patients with chronic viral hepatitis.
Materials and methods of research. The study was conducted in the period from 2016 to 2021 in the Department of Emergency Surgery of the Military Medical Clinical Center. In the first stage, the diagnostic scheme included only surveys to identify potential risk factors for infection and anamnestic data on the presence of HCV diagnosed in the past. In the second stage, rapid tests for antigens and antibodies to HCV were introduced into the diagnostic scheme along with the survey.
Research results. Patients respond differently to pain, and the sen sation of pain is individual and subjective.
Conclusions. Quantitative assessment and registration of the inten sity of pain using a visual-analog scale can supplement the comprehensive information about the general condition of the patient, which is necessary to select the optimal treatment in emergency surgery.
FEATURES OF THE DYNAMIC OF ACUTE C-REACTIVE PROTEIN AND INDICATORS OF THE BODY’S IMMUNE SYSTEM AND THEIR RELATIONSHIP WITH THE CLINICAL PICTURE IN ELDERLY PATIENTS WITH ULCERATIVE GASTROINTESTINAL BLEEDING
Authors: Chukhriienko A. V. , Trofimov M. V. 
Published: January 2022

The aim. Improve the effectiveness of treatment of elderly patients with ulcerative gastrointestinal bleeding by studying the dynamics of the level of C-reactive protein (CRP) and immune system parameters, their relationship with the clinical picture.
Materials and methods. 35 elderly patients in the period from 2019 to 2021 (according to the WHO classification — 61-90 years) with ulcerative gastrointestinal bleeding complicated by cardiovascular pathology. The gender distribution is as follows: men — 19 (54%), women — 16 (46%). The average age of the patients was 76.3 years. This category of patients was divided according to the methods of treatment of concomitant cardiovascular pathology: group A — patients who received therapy according to the standard scheme (n = 20), B — double (n = 15). As a control category of patients (n = 50) was selected. There are relatively healthy (donors), who were similar to the study group in terms of age, gender, and the method for determining indicators.
Results. The state of local endoscopic hemostasis in group “A” was investigated: Forrest II was detected in 14 (70%) patients, Forrest III — in 6 (30%) patients; in group “B”: Forrest I — in 7 (47%) patients, Forrest II — in 8 (53%) patients. These results indicate that using of dual therapy leads to a change in the rheological properties of blood, which, in turn, leads to a decrease in the stability of local endoscopic hemostasis and an increased risk of recurrent bleeding compared with standard antihypertensive therapy (the studied groups are represented, respectively, 100% each).
Conclusions. We have analyzed the C-reactive protein, interleukin-6 and interleukin-4. The main result of the study was the identification of the dynamics of markers in groups A and B. On the seventh day, normalization of these indicators was not revealed (in group B, it was especially pronounced). But the state of the latter was influenced by the therapy of concomitant pathology in patients with cardiovascular pathology. The clinical significance of immune indicators has been proven in many clinical examples and can be one of the objective criteria for assessing the patient’s condition, predicting the disease and correcting the treatment started.
The limiting state of bodies during separation in the case of the general plane problem
Authors: Матвеева Алёна Николаевна , Матвеев Сергей Владимирович 
Published: January 2022

Работа посвящена решению общей плоской задачи, связанной с определением предельного состояния тел при отрыве. Уравнения, определяющие условия предельного состояния принимаются функциями, зависящими от среднего давления и направлений отрыва. В результате вычислений были получены характеристические уравнения для двух случаев: при достижении предельных значений отрыва двумя главными напряжениями и при достижении предельного значения отрыва одним главным напряжением. Для двух рассмотренных случаев были получены уравнения характеристик и соотношения вдоль них.
The work is devoted to the solution of the general plane problem related to the determination of the limiting state of bodies during separation. The equations defining the conditions for the limiting state are taken as functions that depend on the average pressure and directions of separation. As a result of calculations, the characteristic equations were determined for two cases: when the limiting values of separation by two main stresses are reached and when the limiting value of separation by one main stress is reached. For the two considered cases, equations of characteristics and relations along them were obtained.
Analytical solution of a class of nonlinear differential equations of the third order in the complex area
Authors: Орлов Виктор Николаевич , Мустафина Людмила Витальевна 
Published: January 2022

В работе приводится доказательство теоремы существования и единственности аналитического решения класса нелинейных дифференциальных уравнений третьего порядка, правая часть которого представлена полиномом шестой степени, в комплексной области. Расширен класс рассматриваемых уравнений за счет новой замены переменных. Получена априорная оценка аналитического приближенного решения. Представлен вариант численного эксперимента оптимизации априорных оценок с помощью апостериорных.
The article presents a proof of the theorem of the existence and uniqueness of the analytical solution of the class of nonlinear differential equations of the third order, with a polynomial right-hand side of the sixth degree, in the complex domain. The class of the considered equations has been extended by means of a new change of variables. An a priori estimate of the analytical approximate solution is obtained. A variant of the numerical experiment of optimizing a priori estimates using a posteriori estimates is presented.
On the statements of boundary conditions in models of the woven materials production
Authors: Ковалев Владимир Александрович , Мурашкин Евгений Валерьевич 
Published: January 2022

В статье обсуждаются проблемы постановка краевых задач при моделировании процессов аддитивного производства 3D материала, при учете наличия в нем дополнительных выделенных направлений (выкладки волокон в тканых материалах, арматуры в бетонных конструкциях, биоволокон в мышечной ткани и т.д.). Выводится общая форма тензорного соотношения на поверхности наращивания, при учете дополнительного выделенного направления. Определяется необходимая система независимых аргументов определяющей тензорной функции на поверхности наращивания в рассматриваемом случае. Определяется полный набор совместных рациональных инвариантов тензора напряжений и характерных директоров. Дается инвариантно-полная формулировка определяющих соотношений на поверхности наращивания. Предложены постановки краевых задач, моделирующих процессы синтеза тканых 3D материалов. Полученные дифференциальные ограничения конкретизируются для ортогональных систем координат, учитывающих геометрию процесса наращивания.
The article discusses the problem of boundary value problems in models of the additive production processes of a 3D material, taking into account the presence of additional selected directions in it (laying out fibers in woven materials, reinforcement in concrete structures, biofibers in muscle tissue, etc.). The general form of the tensor relation on the growing surface is shown, taking into account the additional selected direction. The necessary system of independent arguments of the constitutive tensor function on the growing surface in the considered case is determined. A complete set of joint rational invariants of the stress tensor and characteristic directors is determined. An invariant-complete formulation of the constitutive relations on the growing surface is given. The formulation of boundary value problems that simulate the processes of synthesis of woven 3D materials are proposed. The resulting differential constraints are specified for orthogonal coordinate systems taking account of the geometry of the growing process.
The generalized stokes integral theorem for a covariant pseudotensor field
Authors: Мурашкин Евгений Валерьевич , Радаев Юрий Николаевич 
Published: January 2022

Ориентируемые континуумы играют важную роль в микрополярной теории упругости, все реализации которой возможны только в рамках псевдотензорного формализма и представления об ориентируемом многообразии. Особенно это касается теории микрополярных гемитропных упругих сред. В настоящей работе рассматриваются различные формулировки интегральной теоремы Стокса для асимметричного ковариантного пседотензорного поля, заданного веса. Тем самым достигается распространение известной интегральной формулы Стокса на случай псевдотензоров. Последнее обстоятельство позволяет использовать, указанное обобщение для микрополярных континуумов. Исследование существенно опирается на класс специальных координатных систем.
Oriented continua play an important role in the micropolar theory of elasticity, all realizations of which are possible only within the framework of the pseudotensor formalism and the orientable manifold concept. This especially concerns the theory of micropolar hemitropic elastic media. In this paper, we consider various formulations of the Stokes integral theorem for an asymmetric covariant pseudotensor field of a given weight. This extends the well-known Stokes integral formula to the case of pseudotensors. The latter circumstance makes it possible to use the manifistated generalization for micropolar continua. The study relies heavily on the class of special coordinate systems.
Enzymatic pre-treatment of grape seeds for an oil with higher antioxidant activity
Authors: Tociu M. , Hirtopeanu A. , Stanescu M.D. 
Published: January 2022

The paper investigates the effect of the enzymatic pre-treatment of grape seeds from six Romanian cultivars on the oil extracted. The grape seeds of some white and red Romanian grape varieties were separated from winery waste, washed, dried and ground, with the oil then obtained by extraction with petroleum ether. The extraction was performed directly or after a preliminary treatment with a commercial pectin lyase. The enzymatic procedure applied was more cost effective compared to other treatments previously described in which a cocktail of enzymes was used. The quantity of the extracted oil was measured in both types of processing, with an increase being observed for pre-treated samples. The fatty acid profiles (FAPs) of the oils resulted for the treated and untreated seeds were determined. No change in the composition was noticed. The reductive power of these oils was also investigated. Compared to the untreated samples for the same variety, the enzyme pre-treatment resulted in a superior antioxidant capacity.