1,779 research outputs found
LIFE JOURNEY: MEDICAL AND SCIENTIFIC WORK OF PROFESSOR V.A. SOKOLOV
No full textThe article is dedicated to doctor of medicine, professor V.A. Sokolov. In 2017 he celebrates his eightieth birthday. Professor V.A. .Sokolov is one of the founders of polytrauma treatment in USSR and Russia. For a long time he had been heading polytrauma department at the N.V. Sklifosovsky Research Institute for Emergency Medicine. Due to his work, algorithms of life sustaining and recovery of serious patients were developed. Professor V.A. Sokolov is the author of 6 monographies and about 300 periodical papers. Besides, he is the holder of 32 patents. Some of his inventions were popularized and manufactured. He had been leading active scientific work, which resulted in 6 doctoral dissertations and 15 candidate theses. The staff of N.V. Sklifosovsky Research Institute for Emergency Medicine congratulates on the anniversary
Heat Exchange System Analysis in the Refining Process
No full textЮшкова Екатерина Александровна, аспирант кафедры «Теплотехника и теплоэнергетика», Санкт-
Петербургский горный университет, г. Санкт-Петербург; [email protected].
Лебедев Владимир Александрович, канд. техн. наук, профессор, заведующий кафедрой «Теплотехника и
теплоэнергетика», Санкт-Петербургский горный университет, г. Санкт-Петербург; [email protected]. E.A. Yushkova, [email protected],
V.A. Lebedev, [email protected].
Saint-Petersburg Mining University, Saint-Petersburg, Russian FederationСтатья посвящена вопросу термодинамической оптимизации установки первичной перегонки нефти
одного из заводов России. Оптимизация осуществляется эксергетическим методом термодинамического
анализа, который позволяет учитывать как количественные, так и качественные характеристики тепло-
вых процессов. В исследовании используются принципы и правила пинч-анализа. Таким образом, в статье решается задача оптимизации системы теплообмена установки первичной переработки нефти с использованием метода пинч-анализа и эксергии. Целью статьи является повышение энергоэффективности за счет снижения эксергетических потерь в технологических процессах переработки нефти. Эксергетический пинч-анализ установки первичной перегонки нефти показал, что существующая система теплообмена не оптимальна. Далее предложены меры для оптимизации системы теплообмена установки.
Эксергетический пинч-анализ позволяет более эффективно использовать энергию и ресурсы на НПЗ,
что актуально на сегодняшний день. The article covers thermodynamic optimization of the primary oil distillation unit at a Russian plant.
The optimization is carried out based on the exergy method of thermodynamic analysis, which allows accounting
for both quantitative and qualitative characteristics of thermal processes. The study uses the principles and rules
of pinch analysis. Thus, the article solves the problem of optimizing the heat exchange system of a primary oil
refining unit using the method of pinch analysis and exergy. The aim of the article is to increase energy efficiency
by reducing exergy losses in oil refining processes. The exergy pinch analysis of the primary oil distillation
unit shows that the existing heat exchange system is not optimal. The paper proposes measures to optimize
the installation heat exchange system. Exergy pinch analysis allows for a more efficient use of energy and
resources at refineries, which is a relevant issue
To the word with love: dedicated to the anniversary of professor V.A. Maslova
No full textThe article presents a brief essay on the scientific biography and academic career of V.A. Maslova, Doctor of Philology, Professor of the Department of German Philology of Vitebsk State University named after P.M. Masherov. Valentina Maslova is one of the best-known modern Russian linguists. She is the author of more than 700 works including classic textbooks. The sphere of V.A. Maslova’s scientific interests includes cultural linguistics, cognitive linguistics, linguistic text analysis, language philosophy, etc. Valentina Maslova has been the leader of Vitebsk school of cultural linguistics for more than 20 years. Within this period there have been implemented several funded scientific projects, PhD theses and a doctoral thesis
К решению задачи синтеза системы управления процессом дозированной подачи электродной проволоки для оборудования дуговой сварки
No full textGoal. Refinement of the methodology for the development of an effective control system for an electric drive with controlled relay-type regulators for organizing a metered feed of an electrode wire using the parameters of the arc process with the possibility of using it in design practice and practice of technological application. Methodology. The proposed method for the mathematical description (mathematical model) of the system of the developed structure electric drive - arc process with current feedback of welding with a variable structure device is based on the theory of automatic control as applied to nonlinear elements, the application of the theory of operational calculus. At the same time, a selection and description of a nonlinear node in the feedback circuit in the form of a relay element with a certain structure and subsequent linearization of this element was made. As an electric motor of the electrode wire feeder, a new development of a specialized valve electric motor is used, which is used in the system with a microprocessor controller. Results. Due to the presence of a substantially nonlinear link, the calculation of the valve electric drive system – the arc process can be found on the basis of a system of nonlinear differential equations, which is practically impossible for practical application. In this work, these complications are overcome on the basis of a rational choice of the description of the nonlinear link, its harmonic linearization and obtaining on this basis a mathematical description of the system, from which, using the methodology of operational calculus, the relations necessary for calculating the parameters of the system are determined in analytical form. Originality. The problem of calculating a rather complex problem of mathematical description of the valve electric drive system – a technological link in the form of an arc process with a substantially nonlinear link in the feedback circuit in the work is solved with the effective use of a set of methodological methods, which include as a means of representing individual links, including nonlinear links selected simplifications and solutions of the obtained differential equations using original methods of operational calculus. The proposed method (mathematical model) is tested in two directions – oscillography of a real system, as well as system simulation. Practical significance. Using the developed methods for describing the control system, it is possible to calculate its characteristics and, on their basis, select the parameters for setting the electric drive controller, which allows, without additional experimental research, to obtain the necessary character of the transfer of electrode metal, and, consequently, the quality of the result of the arc process.Проанализированы существующие системы активного влияния на перенос электродного металла при управлении процессом электродуговой сварки плавящимся электродом, в том числе, и на основе импульсной подачи электродной проволоки. Особо выделен новый способ сварки – с управляемыми параметрами движения за счёт введения в электропривод обратных связей по параметрам дугового процесса cвврки-наплавки с дозированной подачей проволоки. Рассмотрен алгоритм реализации сварки с дозированной подачей. Выбран электропривод механизма подачи, который базируется на специально разработанном быстродействующем вентильном электродвигателе с компьютеризованным регулированием. Для анализа и выбора параметров этой системы предложено рассматривать её в комплексе с дуговым процессом с применением методов гармонической линеаризации
Criteria of equivalent stress concept
No full textS.13-66At present, there exist more than 200 different criteria (Lebedev Development of the theories of strength in the mechanics of materials. Strength Mater 42(5):578-592, 2010, [1]; Pisarenko, Lebedev Deformation and Strength of Materials under Complex Stress State (in Russ.: Deformirovanie i prochnost' materialov pri slozhnom naprjazhennom sostojanii). Naukowa Dumka, Kiev, 1976, [2]; Yu Unified strength theory and its applications. Springer, Berlin, 2004, [3]).This chapter describes selected criteria which are of the significance for the later chapters and for the systematization. These criteria are written in the same manner and generalized subsequently
A new type of accelerator for charged particle cancer therapy
No full textNon-scaling Fixed Field Alternating Gradient accelerators (ns-FFAGs) show great potential for the
acceleration of protons and light ions for the treatment of certain cancers. They have unique features as they combine
techniques from the existing types of accelerators, cyclotrons and synchrotrons, and hence look to have advantages over
both for this application. However, these unique features meant that it was necessary to build one of these accelerators to
show that it works and to undertake a detailed conceptual design of a medical machine. Both of these have now been
done. This paper will describe the concepts of this type of accelerator, show results from the proof-of-principle machine
(EMMA) and described the medical machine (PAMELA)
Bible code in Bashlachev's lyrics. Book review: Gavrikov, V.A. (2021). Eschatology of Bashlachev: Monograph. Moscow, Kaluga, Venice: Bull Terrier Records. (In Russ.)
No full textThe author discusses the specifics of the book under review, describes V.A. Gavrikov main research approaches to Bashlachev's texts, and defines the methodological platform of the monograph. The fruitfulness of considering the poetic world of Bashlachev through the “bible” prism is proved. The relevance of the monograph by V.A. Gavrikov, due to the need to study the artistic ontology of Bashlachev in a linguo-poetic perspective. The main results of the study are identified, their theoretical and historical-literary significance is stated
Today's lifestyles, tomorrow's cancers: Trends in lifestyle risk factors for cancer in low- and middle-income countries
No full textBackground: The global burden of cancer is projected to increase from 13.3 to 21.4 million incident cases between 2010 and 2030 due to demographic changes alone, dominated by a growing burden in low- and middle-income countries (LMICs). Lifestyle risk factors for cancer are also changing in these countries and may further influence this burden.Design: We consider examples of changes already occurring in population-level distributions of tobacco and alcohol consumption, body weight, and reproductive lives of women to gauge the magnitude of their projected impact on cancer incidence in future decades.Results: Trends in lifestyle factors vary greatly between settings and by sex. Some common trends point to considerable increases in cancers of the (i) lung in men due to tobacco smoking; (ii) upper aerodigestive tract (UADT) due to increasing tobacco and alcohol consumption, worse in men; (iii) colon from increasing body mass index, and alcohol and tobacco consumption; and (iv) in women, breast due particularly to consistent international trends of younger age at menarche, smaller family size, and, at postmenopausal ages, increasing body weight.Conclusions: In many LMICs, the future cancer burden will be worsened by changing lifestyles. Affected common cancer sites likely to experience the largest increases are lung, colon, UADT, and breast. © The Author 2011. Published by Oxford University Press on behalf of the European Society for Medical Oncology. All rights reserved
Expanding the Applicability of the Competitive Modes Conjecture
No full textThe Competitive Modes Conjecture is a relatively new approach in the field of Dynamical Systems, aiming to understand chaos in strange attractors using Resonance Theory. Up till now, the Conjecture has only been used to study multipolynomial systems because of their simplicity. As such, the study of non-multipolynomial systems is sparse, filled with ambiguity, and lacks mathematical structure. This paper strives to rectify this dilemma, providing the mathematical background needed to rigorously apply the Competitive Modes Conjecture to a certain set of non-multipolynomial systems. Afterwards, we provide an example of this new theory in the non-multipolynomial Wimol-Banlue Attractor, something that up to this point has not been possible as far as the authors know.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Numerical Analysi
The Interaction of Molted Slag with Solid Phase of Red Sludge
No full textЛебедев Андрей Борисович, аспирант кафедры металлургии, Санкт-Петербургский горный университет, г. Санкт-Петербург; [email protected]; ORCID ID 0000-0002-5264-9317.
Утков Владимир Афанасьевич, д-р техн. наук, профессор кафедры автоматизации технологических процессов и производств, Санкт-Петербургский горный университет, г. Санкт- Петербург; [email protected]; ORCID ID 0000-0001-7845-0608.
A.B. Lebedev, [email protected],
V.A. Utkov, [email protected]
Saint-Petersburg Mining University, Saint-Petersburg, Russian FederationАктуальнейшей современной задачей цветной металлургии является замена экологически опасного складирования красного шлама (КШ), отхода производства глинозема из бокситов, его полной переработкой. Необходим поиск соответствующих промышленных технологий. Одной из них, как показала данная работа, является использование КШ при грануляции расплавленных шлаков. Граншлак устойчиво используется в больших количествах при производстве цементов, в дорожном строительстве, сельском хозяйстве и в других областях техники и технологий. Особенностью процесса получения граншлака является активное взаимодействие расплавленного металлургического шлака с охлаждающей жидкостью. Одновременно и мгновенно происходят затвердевание шлака и разрыв массы последнего в атмосфере острого пара на мелкие частицы из-за возникающих критических напряжений. Проблема состоит в том, что при грануляции шлаков, как правило, содержащих серу, в атмосферу выделяется большое количество вредных веществ: оксидов серы и в основном сероводорода. Его концентрация на рабочих площадках участков грануляции многократно превышает ПДК. Для борьбы с этим явлением в состав охлаждающей жидкости чаще всего вводят обладающие сорбционными свойствами тонкодисперсные известь или известняк, что связано с большими затратами. В данной работе изучались аналогичные свойства тонкодисперсного красного шлама. Проведены лабораторные и промышленные испытания. Обнаружено, что с его помощью концентрация сернистых газов на рабочих площадках грануляции может быть уменьшена на 2 порядка. Важно, что новый граншлак, названный в данном случае «шламошлаком», не уступает обычному по основным технологическим свойствам. Nowadays the most urgent task of non-ferrous metallurgy is the replacement of ecologically dangerous storage of red mud (RM), the withdrawal of alumina production from bauxite, by its complete processing. It is necessary to search for appropriate industrial technologies. This work has demonstrated that one of them is the use of RM for granulation of molten slags. The large amounts of granulated slag are regularly used in the production of cements, in road construction, agriculture and other fields of engineering and technology. The characteristic of the process for obtaining granulated slag is the active interaction of molten metallurgical slag with a cooling liquid. The slag solidifies and its mass breaks up in the atmosphere of the hot steam into small particles because of the emerging critical stresses. These two processes happen simultaneously and instantly. The problem is that during the granulation of slag, which usually contains sulfur, a large amount of harmful substances is released into the atmosphere, such as, sulfur oxides and, mainly, hydrogen sulfide. Its concentration on the working sites of the granulation sections is much higher than the TLV. To combat this phenomenon, fine-dispersed lime or limestone, which are characterized by their sorption properties, are usually added into the cooling liquid composition, bur it results in high expenditures. This paper examines similar properties of finely dispersed red mud. Laboratory and industrial tests have been carried out. It is found that with the help of red mud the concentration of sulfur gases on the granulation working sites can be reduced by 2 orders of magnitude. It is important that the new granulated slag, called in this case “slurry” is not inferior to the usual one according to its basic technological properties.Работа проведена при финансовой поддержке Министерства образования и науки Российской Федерации (регистрационный номер проекта 11.4098.2017/ПЧ от 01.01.2017)
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