32 research outputs found
ЗАХИСТ КОЛЕКТОРА ТЯГОВИХ ЕЛЕКТРИЧНИХ ДВИГУНІВ ЕЛЕКТРОВОЗА ВІД ПОШКОДЖЕННЯ ДУГОВИМ РОЗРЯДОМ
No full textHigh requirements are imposed on railway transport in terms of its safety and reliability. The failure of an electric locomotive can jeopardize traffic safety, as well as lead to material and economic costs. One of the most vulnerable elements of the electric rolling stock of railways are traction electric motors, which on many electric locomotives have a significant service life. Due to significant depletion of the resource and due to difficult operating conditions, the likelihood of malfunctions in both the mechanical and electrical parts of the engine increases. Particular attention should be paid to malfunctions associated with the brush-commutator assembly of the traction electric motor. Having considered the causes of the failure of collector electric motors of various series of electric locomotives, it is clear that a significant percentage of failures is associated with damage to the brush-commutator assembly. The main reason for this pattern is the physical interaction of two contacts that move relative to each other, which creates the possibility of an electric arc between them. This paper examines the causes of arc discharge in the brush-commutator assembly of the traction electric motor of an electric locomotive, which can lead to serious damage and failures. Existing methods of diagnosing traction motors are analyzed, their advantages and disadvantages are determined. A method for detecting arc formation in the brush-commutator assembly based on measuring the intensity of ultraviolet radiation is developed. An engine protection system based on a programmable logic controller is developed. The feasibility and effectiveness of implementing such a system on electric locomotives to increase the reliability of traction electric motors and reduce operating costs is substantiated. Since on locomotives operated in Ukraine, DC electric machines are used not only to generate traction force, but also to generate excitation current, voltage for their own needs and for the operation of other units, a logical development of the topic described in the paper can be the improvement of the system for protecting auxiliary machines of electric locomotives. In the future, this would further increase the reliability and productivity of electric railway rolling stock.До залізничного транспорту висуваються високі вимоги щодо його безпеки та надійності. Вихід з ладу електровоза може ставити під загрозу безпеку руху, а також призвести до матеріальних та економічних витрат. Одними з найвразливіших елементів електричного рухомого складу залізниць є тягові електричні двигуни, які на багатьох електровозах мають значний термін експлуатації. Внаслідок значного вичерпання ресурсу та через важкі умови експлуатації збільшується імовірність виникнення несправностей як у механічній, так і в електричній частинах двигуна. Особливу увагу варто приділити несправностям, які пов’язані із щіточно-колекторним вузлом тягового електричного двигуна. Розглянувши причини виходу з ладу колекторних електричних двигунів різних серій електровозів, видно, що значний відсоток виходів з ладу пов’язаний із пошкодженням саме щіточно-колекторного вузла. Основною причиною такої закономірності є фізична взаємодія двох контактів, які рухаються один стосовно одного, що породжує можливість виникнення електричної дуги між ними. У цій роботі розглянуто причини виникнення дугового розряду в щіточно-колекторному вузлі тягового електричного двигуна електровоза, що може призводити до серйозних пошкоджень та відмов у роботі. Проаналізовано наявні методи діагностики тягових двигунів, визначено їхні переваги та недоліки. Розроблено методику виявлення утворення дуги у щіточно-колекторному вузлі на основі вимірювання інтенсивності ультрафіолетового випромінювання. Розроблено систему захисту двигуна, яка базується на програмованому логічному контролері. Обґрунтовано доцільність та ефективність впровадження такої системи на електровозах для підвищення надійності тягових електродвигунів та зниження експлуатаційних витрат. Оскільки на локомотивах, що експлуатуються в Україні, колекторні електричні машини застосовуються не лише для утворення тягового зусилля, а й для генерації струму збудження, напруги власних потреб та для роботи інших агрегатів, логічним розвитком описаної у роботі теми може стати удосконалення системи для виконання захисту допоміжних машин електровозів. У перспективі це дозволило б ще більше збільшити надійність та продуктивність роботи електрорухомого складу залізниць
Обіг аграрних розписок в Україні: актуальні проблеми правового забезпечення
No full textAgrarian receipts are the title documents used in credit legal relations of agricultural enterprises and individuals engaged in agricultural production. The article deals with the problem of legal framework of formalization, issuance, registration and circulation of agricultural receipts. The author make suggestions to improving the legislation of Ukraine concerning with the turnover of agricultural receipts.Аграрні розписки є товаророзпорядчими документами, що застосовуються у правовідносинах кредитування сільськогосподарських підприємств та фізичних осіб, що займаються сільськогосподарським виробництвом. У статті розглянуто проблеми правового забезпечення оформлення, видачі, реєстрації та обігу аграрних розписок. Внесено пропозиції з удосконалення законодавства України щодо обігу аграрних розписок
Імідж сучасної Франції як елемент «Soft power» держави на міжнародній арені.
No full textТhis article examines the image of modern France in the international arena as an instrument of the country’s Soft Power in the international arena. As the main components of this tool, the author focuses on liberal democratic values, cooperation with the former colonies, the role of the leader in Europe and the role of the mediator.У даній статті розглядається імідж сучасної Франції на міжнародній арені у якості інструменту Soft Power держави на міжнародній арені. У якості основних складових даного інструменту авторка акцентує увагу на ліберально-демократичних цінностях, співпраці із колишніми колоніями, роль лідера в Європі та ролі держави-медіатора
ФИЗИКО-ГЕОЛОГИЧЕСКИЕ МОДЕЛИ РЫХЛЫХ ОТЛОЖЕНИЙ И МЕСТОРОЖДЕНИЙ И ИХ ПРИМЕНЕНИЕ ПРИ ГЕОРАДАРНОМ ЗОНДИРОВАНИИ
No full textThe complex of geophysical methods used by the author in the rapid study of ore deposits in placers and weathering crust is briefly presented. Examples of objects and their brief petrophysical characteristics are presented. Physical and geological features of unconsolidated sediments, including various types of SCW, as well as electrical and magnetic characteristics of the underlying base rocks are considered.Коротко представлен комплекс геофизических методов, использованных автором при экспрессном изучении рудных месторождений в россыпях и корах выветривания. Представлены примеры объектов и их краткие петрофизические характеристики. Рассмотрены физико-геологические особенности неконсолидированных отложений, включая ЗКВ различных типов, а также электрические и магнитные характеристики непосредственно подстилающих их пород основания
REVIEW оf the monograph V. Yu. Lukyanova “Technical regulation in the system of the Russian legislation”
No full textObjective: to carry out a comprehensive analysis of a monograph by V.Yu. Lukyanova, devoted to one of the main elements of the legal institution of technical regulation - the technical norm.Methods: dialectic approach to the cognition of social phenomena, which enables to analyze them in historical development and functioning in the context of the integrity of objective and subjective factors; it determined the choice of the following research methods: formal-legal, comparative legal, etc. Results: the main approaches of the reviewed monograph were assessed which refer to the nature of technical norm, its position in the legislation on technical regulation. The reviewed monograph consists of an introduction, two sections, conclusion and bibliography. The introduction describes technical regulation at the modern stage of development, substantiates the topicality of the research, and briefly describes its structure. The first section is devoted to the legal nature of technical regulation. It explores such issues as: the development of concepts about the acts stipulating the mandatory requirements to products; the content of technical regulation; the forms of adopting technical regulations and their juridical force. The work also analyzes the role of technical regulation in the legislation system of the Russian Federation. In conclusion, the author proposes a systematic-parametric model of technical regulation in the Russian Federation.Scientific novelty: for the first time, the assessment is given to the provisions of the reviewed monograph, which refer to the nature of technical norm, limitations of its action both in time and space and by the circle of persons, the position in the modern Russian legislation. The conclusion is made that the monograph by V.Yu. Lukyanova should be published. Practical significance: the reviewer concludes that the monograph by V.Yu. Lukyanova can be used by specialists in the sphere of technical regulation and standardization, research workers, judicial authorities, students and post-graduate students
TEORETICAL CONTROVERSY OF ECONOMISTS AND SOCIOLOGIST HOW TO PROCEED FROM MUTUAL ACCUSATIONS TO A DIALOGUE?
No full textThe author`s approach to the theme of the artificle is focused on the research of the dialogical relationship between scientific practice and its philosophical and methodological awareness, which is subordinated to the main requirement of clear awareness of the prerequisites of the philosophical and methodological solution and constructions. The object of the research: the phenomena of scientific practice of economists and sociologists who make the intellectual environment extremely unfriendly in their mutual relations of economic science and sociology for interdisciplinary research and who receive in their discussions the term “economic imperialism” and “sociological imperialism”. The object-fild of premise is distinguished in the areas of economic and sociological knowledge. The purpose of the research: explication of the metaphors “economic imperialism” and “sociological imperialism”, which would allow to identify inefficient attitudes that oppose the dialogue of sociologists. Setting five tasks and determining the sequence in solving them help to achieve the goal. From the author`s point of view, the confrontational metaphors of “economic imperialism” and “sociological imperialism” have to replaced by the productive metaphor of inseparable and non-existent coexistence of economics and sociology, which is explicated to realistic methodological recommendations that can be used in the practice of scientific interdisciplinary social research
О распространенности углеводородов в кристаллическом фундаменте Татарского свода
No full textThe article considers the version of the possible sources of replenishment hydrocarbons sedimentary sequence Romashkinskoye field (Tatarstan, Russia), given deposit. Speaking about the structure framing the Tatar coving, features of their buildings and prerequisites to search those hydrocarbons. In the end the author says about the prospects elaboration of Romashkinskoye field.В статье рассматривается версия о возможных источниках подпитки углеводородами осадочной толщи Ромашкинского месторождения (Татарстан, РФ), которая осуществляется по тектоническим нарушениям в кристаллическом фундаменте данного месторождения. Говорится о структурах, обрамляющих Татарский свод, особенностях их строения и предпосылках для поиска в них углеводородов. Определены перспективы разработки Ромашкинского месторождения
Magnetization of a nonferromagnetic metal spacer sandwiched between two magnetically ordered layers
No full textThe exchange coupling of magnetically ordered layers (MOLs) through a nonmagnetic metallic
spacer was calculated. The induced magnetization in the spacer, taking into account the influence
of an external magnetic field, was calculated, too. This calculation shows that the energy of coupling
of the MOLs through the nonmagnetic metallic spacer is a long-periodic function of the
spacer’s thickness and magnetic field, i.e., the exchange coupling between the layers varies from
ferromagnetic to antiferromagnetic and vice versa depending on the spacer’s thickness and magnetic
field. Also this calculation shows that in nonferromagnetic spacer the induced magnetization
can undergo many complete rotations depending on distance to the boundaries with the MOLs.
Moreover, absolute value of induced magnetization nonmonotonously decays with distance from
the interfaces inside the spacer. It is shown that the character of the decay of absolute value magnetization
from the interfaces into the interior of the spacer is influenced by magnetic field.The author is grateful to Prof. V.G. Baryakhtar for
fruitful discussion of the results and to Prof. A.V.
Svidzinsky for discussion of basic aspects of the model
used in this work for calculation of the induced magnetization
of the spacer
Generalized Hermite Polynomials and Monodromy-Free Schrödinger Operators
No full textThe paper gives a review of recent progress in the classification of monodromy-free Schrödinger operators with rational potentials. We concentrate on a class of potentials constituted by generalized Hermite polynomials. These polynomials, defined as Wronskians of classic Hermite polynomials, appear in a number of mathematical physics problems as well as in the theory of random matrices and 1D SUSY quantum mechanics. Being quadratic at infinity, those potentials demonstrate localized oscillatory behavior near the origin. We derive an explicit condition of non-singularity of the corresponding potentials and estimate a localization range with respect to indices of polynomials and distribution of their zeros in the complex plane. It turns out that 1D SUSY quantum non-singular potentials come as a dressing of the harmonic oscillator by polynomial Heisenberg algebra ladder operators. To this end, all generalized Hermite polynomials are produced by appropriate periodic closure of this algebra, which leads to rational solutions of the Painlevé IV equation. We discuss the structure of the discrete spectrum of Schrödinger operators and its link to the monodromy-free condition.The work has been supported by a Russian Scientific Foundation grant 17-11-01004. The author is also grateful to the referee's remarks, which helped to improve this paper
Magnetization of a nonferromagnetic metal spacer sandwiched between two magnetically ordered layers
No full textThe exchange coupling of magnetically ordered layers (MOLs) through a nonmagnetic metallic
spacer was calculated. The induced magnetization in the spacer, taking into account the influence
of an external magnetic field, was calculated, too. This calculation shows that the energy of coupling
of the MOLs through the nonmagnetic metallic spacer is a long-periodic function of the
spacer’s thickness and magnetic field, i.e., the exchange coupling between the layers varies from
ferromagnetic to antiferromagnetic and vice versa depending on the spacer’s thickness and magnetic
field. Also this calculation shows that in nonferromagnetic spacer the induced magnetization
can undergo many complete rotations depending on distance to the boundaries with the MOLs.
Moreover, absolute value of induced magnetization nonmonotonously decays with distance from
the interfaces inside the spacer. It is shown that the character of the decay of absolute value magnetization
from the interfaces into the interior of the spacer is influenced by magnetic field.The author is grateful to Prof. V.G. Baryakhtar for
fruitful discussion of the results and to Prof. A.V.
Svidzinsky for discussion of basic aspects of the model
used in this work for calculation of the induced magnetization
of the spacer
