157 Works

Growth of thick gallium oxide on the various substrates by halide vapor phase epitaxy

A.V. Kremleva, Sh.Sh. Sharofidinov, A.M. Smirnov, E. Podlesnov, M.V. Dorogov, M.A. Odnoblyudov, V.E. Bougrov & A.E. Romanov

On a configurational force driving surface growth of solids

A.B. Freidin & Y.O. Izmaylova
Surface growth of solids includes a wide variety of processes starting from additive manufacturing technologies and ending with plenty of biological problems. Model of surface growth based on the expression of the configurational force, derived from fundamental laws and entropy inequality, is offered in the present paper. A new expression for the configurational force called surface growth force, which controls growth and resorption, is used. Analysis of the applicability of the developed model was carried...

Selective laser melting of copper alloy

I.A. Polozov, E.V. Borisov, V.Sh. Sufiiarov & A.A. Popovich
Additive Manufacturing (AM) of copper and its alloys is a promising way to produce parts with complex geometries without tooling. One of the AM processes is Selective Laser Melting (SLM) technology that uses a laser beam to fuse powder layers to obtain a final part. Laser processing of copper is considered to be a challenging task due to its high thermal conductivity and poor laser absorptivity. In the present work, Cu-Cr-Zr-Ti alloy powder has been...

Physical fundamentals of thermomechanical processing in ultrafine-grained metallic materials manufacturing

А.I. Rudskoi, G.Е. Коdzhaspirov, J. Kliber, Ch. Apostolopoulos & D.A. Kitaeva
The processing of metallic materials through the application Thermomechanical Processing (TMP) has now become of major importance in the world research and industrial companies. A great attention is paid to study of mechanism TMP applied to different techniques and technological processes providing ultrafine-grained state of metal materials including submicro – and nanocrystalline ones. The main development in terms of obtaining bulk metallic materials received in the recent years, various schemes of TMP of metallic materials,...

Asymptotics of a thermal wave in one-dimensional harmonic crystal

A.M. Krivtsov, E.A. Podolskaya & V.Yu. Shubina
An asymptotic representation is obtained at large times for the thermal wavefront propagating in a one-dimensional harmonic crystal. The propagation of thermal waves from a localized thermal perturbation and the transition zone between regions with different temperatures is considered. An explicit solution is given for a number of the simplest forms of the initial temperature distribution. It is shown that during the wave evolution, the wavefront smoothes, e.g., for a power-law dependence its degree increases...

FRP helical micro screw pile with cast iron pile cap: Review

Nikolai Ivanovich Vatin, Renat Nurmukhametov, Ilizar Mirsayapov, Евгений Васюткин, Dmitriy Burin & Sergey Vasyutkin

Bearing Capacity of Reinforced Concrete T-beams with a Steel Profile

Vladimir Korsun, Георгий Швец & Natalia Vinogradova

Double Seismic Insulation System of Turbine Unit Foundation

Vladimir Tarasov

Генерирование базовых инвестиционных целей предприятия в стратегической перспективе

Николай Дмитриевич Дмитриев & Людмила Эдуардовна Дубаневич
Современные условия хозяйствования обусловливают необходимость привлечения инвестиционных вложений с целью максимизации инвестиционной эффективности. Для ее поддержания требуется определиться с инвестиционными целями предприятия. Данное исследование направлено на рассмотрение теоретических основ процесса генерирования базовых инвестиционных целей. Построение объективного исследования требует решения задач по выработке требований к генерированию стратегических целей, учитывая социальные тенденции общества. Предложено рассмотрение инвестиционной деятельности как с целью получения экономической эффективности, так и с целью развития социальных эффектов. Выявлено, что именно формирование целевых установок на...

EXPERIMENTAL STUDY AND MODELING OF PRE-DEFORMATION EFFECT ON AUSTENITE TO FERRITE TRANSFORMATION

A.A. Vasilyev, D.F. Sokolov, S.F. Sokolov & A.A. Zisman
Transformation kinetics of undeformed and deformed austenite during continuous cooling has been investigated on several industrial steels. Dimensions of both prior austenite grains and ferrite grains in ferrite-pearlite structures obtained for various states of parent austenite and cooling rates were determined. Based on the obtained experimental data a physically motivated model is formulated for the ferritic transformation with allowance for the effects of deformation and concurrent recovery of austenite. Under consideration is the deformation influence...

Non-linguistic systems as a way to make a password secure but memorable

Victoria Vorotnikova & Sergey Karlin
This article is based on the study of ways to create a secure password by integrating symbols from non-linguistic sign systems, in order to combine cryptographic strength and ease of memorization. This is relevant, as the old ways of complicating the password become obsolete, in view of their triviality and, as a result, susceptibility to hacking. Our research is based on the use of a system of symbols from various fields of interest (chemistry, programming,...

Обеспечение герметичности шиберной задвижки путем получения необходимой шероховатости седла из титанового сплава

Лев Миргородский, Сергей Александрович Любомудров, Сергей Иванович Миргородский & Ольга Юрьевна Ширипа
В статье изложены результаты исследования герметичности шиберных задвижек со стальным корпусом и седлом, изготовленным из титанового сплава ВТ6, в зависимости от режима токарной обработки торцевой поверхности седла. Установлена существенная зависимость параметров шероховатости торцевой поверхности седла Ra и Rz от скорости резания, подачи и глубины. Результаты приемочных испытаний шиберных задвижек на Усть-Каменогорском заводе промышленной арматуры показали, что седла из титанового сплава с параметрами шероховатости торцевой поверхности Ra /Rz = 0,219/1,375 и Ra /Rz = 0,226/1,189 (мкм)...

Электрогидроимпульсная вытяжка-формовка с интенсификацией течения фланца заготовки

Ксения Сергеевна Арсентьева & Вячеслав Сабайдинович Мамутов
Представлена новая технологическая схема интенсифицированной электрогидроимпульсной вытяжки- формовки листовых металлов. Основное отличие от традиционной схемы заключается в замене неподвижного прижима инерционным разглаживателем и создании увеличенного зазора между формоизменяющей матрицей и фиксирующим элементом. Предлагаемая технологическая схема характеризуется простотой конструкции и реализации в сравнении с имеющимися аналогами.

Natural isomers of fullerenes from C20 to C28

Alexander I. Melker & Aleksandra N. Matvienko
We have systematized possible ways of forming the isomers of midi-fullerenes, namely C22, C24, C26 and C28. There are three the most natural mechanisms of their obtaining: embedding carbon dimers into initial fullerenes; fusion of carbon cupolas having the same symmetry; fusion of fullerenes having compatible symmetry. The minimum energy fullerenes are obtained through the use of the first mechanism. It is worth noting that these fullerenes conserve the topological three-fold symmetry. At the same...

ASYMPTOTICAL REGIMES OF THE HYDROFRACTURING PLANAR 3D MODEL

E.V. Shel
In the proposed paper the Planar 3D model of hydraulic fracturing was investigated. All of the hydraulic fracturing equations were substituted into the mass conservation law and scaled. Nontrivial dimensionless parameters of the problem were found. Asymptotic regimes of the equation, the Radial or the Pseudo3D model, correspond to the infinitely small or the infinitely large dimensionless parameters. Thus, the limiting conditions of these models were found in the terms of the dimensionless parameters.

Natural isomers of fullerenes from C30 to C40

Alexander I. Melker, Aleksandra N. Matvienko & Maria A. Krupina
We have systematized possible ways of forming the isomers of midi-fullerenes, namely C30, C32, C34 C36, C38 and C40. Similar to the isomers of midi-fullerenes from C20 to C28, there are three the most natural mechanisms of their formation: 1) Embedding carbon dimers into initial fullerenes; 2) Fusion of carbon cupolas having the same symmetry; and 3) Fusion of fullerenes having compatible symmetry. The energies of the fullerenes calculated through the use of molecular mechanics...

3D finite element, connected with orthogonal finite functions, in modeling and investigation of elastic homogeneous and heterogeneous material

V.L. Leontiev & I.V. Efremenkov
A novel 2D finite element (FE) associated with orthogonal finite functions (OFF, orthogonal splines) was developed for the ANSYS software and was tested early. The expansion of this method is presented here. The novel 3D FE, connected with 3D OFF is proposed for modeling and investigation of the stress-strain state of homogeneous and heterogeneous elastic bodies. The accuracy of the solutions obtained with this 3D FE is as high as for the classic ANSYS 3D...

Sign Systems and Technologies in Forensic Science

Dmitriy Mokhorov & Anna Mokhorova
The problem of forming a terminological apparatus, the ratio of natural and artificial languages in Forensic Science are extremely important. Language as a system of means of expressing and transmitting information about material and ideal objects and phenomena in forensic science is not sufficiently researched but has recently received much attention in scientific literature. The collected papers study the verbal means of expression - the development and clarification of the conceptual apparatus, the formation of...

Mechanical Characteristics of High-Strength Concrete with Fly Ash and Silica Fume at Elevated Temperatures: The Influence of Heating Duration

Aleksey Baranov, Евгения Зорина & Ivan Kirian

Laser Method of Micro-Composite Materials Synthesis for New Sensor Platforms of an “Electronic Tongue”

Svetlana Kochemirovskaia & Vladimir Kochemirovsky
The information on the chemical composition of biological food mixes cannot be adequately received and submitted by traditional chemical analysis methods. The Electronic Tongue technology, composed of non-selective sensors, offers a modern language of submitting information on the composition of mixes. Sensor data are mathematically processed and visualized in the form of spatial clusters on the plane of the component coordinates chosen. At the same time the materials used for the sensors play an important...

Laser-driven metal alteration for glucose detection sensor

A. Kondrateva, V. Babyuk, D. Strekalovskaya, L. Filatov, P. Gabdullin, O. Kvashenkina, Y. Prokopenko, A. Gruzdev, K. Petruhno & A. Kuznetsov
In this work, an experimental comparison of the laser-driven alteration of nickel, copper, and steel surface efficiency was carried out. The selection of the material most suitable for non-enzymatic measurement of the glucose amount in the medium was carried with respect to surface modification efficiency. The electrooxidative activity of the fabricated structures with a modified surface was investigated with respect to the glucose addition to a 0.1 M solution NaOH by potentiostatic method. The modified...

ECONOMIC SECURITY AND INNOVATIVE COMPONENT OF A REGION: A COMPREHENSIVE ASSESSMENT

Andrey Zaytsev, Pak Khe Sun, Olga Elkina, Tatiana Tarasova & Nikolay Dmitriev

Language of AI

Daria Bylieva
In the modern world human-robot relations, language plays a significant role. One used to view language as a purely human technology, but today language is being mastered by non-humans. Chatbots, voice assistants, embodied conversational agents and robots have acquired the capacity for linguistic interaction and often present themselves as humanoid persons. Humans begin to perceive them ambivalently as they would acknowledge an Other inside the make-believe of a game. Using artificial neural nets instead of...

Open elevation WorldDEM in comparison with aerial laser scanning

Egor Grebenyuk & Anatoliy Novik

Climate-Adaptive Facades with Automatic Control System

Darya Nemova, Sergey Bochkarev & Darya Andreeva

Registration Year

  • 2022
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Resource Types

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    52

Affiliations

  • Peter the Great St. Petersburg Polytechnic University
    157
  • Institute of Problems of Mechanical Engineering
    7
  • Ioffe Institute
    6
  • ITMO University
    3
  • Graz University of Technology
    2
  • University of Patras
    2
  • Saint Petersburg Mining University
    2
  • Saint Petersburg State Electrotechnical University
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  • St Petersburg University
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  • TU Dresden
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