1,062 research outputs found

    Modeling of "groove" rolling defect on internal surface of pipes at lengthwise rolling

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    The research has been conducted in pipe forming at rolling off by lengthwise rolling mill with stub mandrel; the patterns of change in dimensionless parameters were determined, which characterize deformation in side angle depending on http://www.multitran.ru/c/m.exe?t=424995_2_1elongation ratio. The model of formation of lengthwise groove on internal surface of pipes has been proposed

    Π’Π•Π Π˜Π€Π˜ΠšΠΠ¦Π˜Π― Π­ΠšΠžΠΠžΠœΠ•Π’Π Π˜Π§Π•Π‘ΠšΠžΠ™ ΠœΠžΠ”Π•Π›Π˜ Π‘ Π£Π§Π•Π’ΠžΠœ АПРИОРНЫΠ₯ ΠžΠ“Π ΠΠΠ˜Π§Π•ΠΠ˜Π™ НА Π‘Π’Π Π£ΠšΠ’Π£Π ΠΠ«Π• ΠŸΠΠ ΠΠœΠ•Π’Π Π«

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    The article describes a method for verification of a statistical model, which, firstly, is represented by the time series of original data and, secondly, is linear in the estimated parameters. Experience in statistical calculations on real empirical data shows that the most well-known and conventionally used in the econometric modeling of mathematical-statistical methods (least squares, maximum likelihood method, and similar methods) often do not ensure successful verification of theoretically required forms of econometric models. The developed method which is called an alternative method of linear regression (AMLR) provides an account of a priori restrictions on the absolute values and signs of the parameters identified by the model. The AMLR based on the concept of best linear index, is known in the theory of statistics from the end of the 1950s. Mathematically AMLR it based on the method of principal components. The article analyzes conditions for applying the AMLR in econometric modeling and methods of transformation of the initial statistical information to ensure correct application of the developed evaluation procedures.Special problems of the proposed method are to determine the level of accuracy of approximation of the dependent variable of the model. In this regard, to assess the level of precision of the statistical model verifiable by using the AMLR, was developed an original method of decomposition of the time series on the regular and stochastic components. The author analyzes the properties of the proposed method of decomposition and gave a numerical illustration of its use in econometric calculations.Π’ ΡΡ‚Π°Ρ‚ΡŒΠ΅ описан ΠΌΠ΅Ρ‚ΠΎΠ΄ Π²Π΅Ρ€ΠΈΡ„ΠΈΠΊΠ°Ρ†ΠΈΠΈ статистичСской ΠΌΠΎΠ΄Π΅Π»ΠΈ, которая, Π²ΠΎ-ΠΏΠ΅Ρ€Π²Ρ‹Ρ…, прСдставлСна Π²Ρ€Π΅ΠΌΠ΅Π½Π½Ρ‹ΠΌΠΈ рядами исходных Π΄Π°Π½Π½Ρ‹Ρ… ΠΈ, Π²ΠΎ-Π²Ρ‚ΠΎΡ€Ρ‹Ρ…, являСтся Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΠΏΠΎ ΠΎΡ†Π΅Π½ΠΈΠ²Π°Π΅ΠΌΡ‹ΠΌ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€Π°ΠΌ. ΠžΠΏΡ‹Ρ‚ статистичСских расчСтов Π½Π° основС Ρ€Π΅Π°Π»ΡŒΠ½Ρ‹Ρ… эмпиричСских Π΄Π°Π½Π½Ρ‹Ρ… ΡΠ²ΠΈΠ΄Π΅Ρ‚Π΅Π»ΡŒΡΡ‚Π²ΡƒΠ΅Ρ‚ ΠΎ Ρ‚ΠΎΠΌ, Ρ‡Ρ‚ΠΎ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ извСстныС ΠΈ Ρ‚Ρ€Π°Π΄ΠΈΡ†ΠΈΠΎΠ½Π½ΠΎ примСняСмыС Π² ΠΏΡ€Π°ΠΊΡ‚ΠΈΠΊΠ΅ экономСтричСского модСлирования ΠΌΠ°Ρ‚Π΅ΠΌΠ°Ρ‚ΠΈΠΊΠΎ-статистичСскиС ΠΌΠ΅Ρ‚ΠΎΠ΄Ρ‹ (ΠΌΠ΅Ρ‚ΠΎΠ΄ Π½Π°ΠΈΠΌΠ΅Π½ΡŒΡˆΠΈΡ… ΠΊΠ²Π°Π΄Ρ€Π°Ρ‚ΠΎΠ², ΠΌΠ΅Ρ‚ΠΎΠ΄ максимального правдоподобия ΠΈ Π±Π»ΠΈΠ·ΠΊΠΈΠ΅ ΠΊ Π½ΠΈΠΌ ΠΌΠ΅Ρ‚ΠΎΠ΄Ρ‹) ΠΎΡ‡Π΅Π½ΡŒ часто Π½Π΅ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡŽΡ‚ ΠΎΠ±Π΅ΡΠΏΠ΅Ρ‡ΠΈΡ‚ΡŒ ΡƒΡΠΏΠ΅ΡˆΠ½ΡƒΡŽ Π²Π΅Ρ€ΠΈΡ„ΠΈΠΊΠ°Ρ†ΠΈΡŽ тСорСтичСски Ρ‚Ρ€Π΅Π±ΡƒΠ΅ΠΌΡ‹Ρ… Ρ„ΠΎΡ€ΠΌ экономСтричСских ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ. Π Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½Π½Ρ‹ΠΉ ΠΌΠ΅Ρ‚ΠΎΠ΄, Π½Π°Π·Ρ‹Π²Π°Π΅ΠΌΡ‹ΠΉ Π°Π»ΡŒΡ‚Π΅Ρ€Π½Π°Ρ‚ΠΈΠ²Π½Ρ‹ΠΌ ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΎΠΌ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ рСгрСссии (ΠΠœΠ›Π ), обСспСчиваСт ΡƒΡ‡Π΅Ρ‚ Π°ΠΏΡ€ΠΈΠΎΡ€Π½Ρ‹Ρ… ΠΎΠ³Ρ€Π°Π½ΠΈΡ‡Π΅Π½ΠΈΠΉ Π°Π±ΡΠΎΠ»ΡŽΡ‚Π½Ρ‹Ρ… Π·Π½Π°Ρ‡Π΅Π½ΠΈΠΉ ΠΈ Π·Π½Π°ΠΊΠΎΠ² ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€ΠΎΠ² ΠΈΠ΄Π΅Π½Ρ‚ΠΈΡ„ΠΈΡ†ΠΈΡ€ΡƒΠ΅ΠΌΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ. Π’ основС ΠΠœΠ›Π  Π»Π΅ΠΆΠΈΡ‚ концСпция Π½Π°ΠΈΠ»ΡƒΡ‡ΡˆΠ΅Π³ΠΎ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠ³ΠΎ индСкса, извСстная Π² Ρ‚Π΅ΠΎΡ€ΠΈΠΈ статистики с ΠΊΠΎΠ½Ρ†Π° 1950-Ρ… Π³ΠΎΠ΄ΠΎΠ². Π’ матСматичСском ΠΎΡ‚Π½ΠΎΡˆΠ΅Π½ΠΈΠΈ ΠΠœΠ›Π  основываСтся Π½Π° ΠΌΠ΅Ρ‚ΠΎΠ΄Π΅ Π³Π»Π°Π²Π½Ρ‹Ρ… ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚. ΠŸΡ€ΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡ€ΠΎΠ²Π°Π½Ρ‹ условия примСнСния ΠΠœΠ›Π  Π² экономСтричСском ΠΌΠΎΠ΄Π΅Π»ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠΈ ΠΈ ΠΌΠ΅Ρ‚ΠΎΠ΄Ρ‹ прСобразования исходной статистичСской ΠΈΠ½Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ, ΠΎΠ±Π΅ΡΠΏΠ΅Ρ‡ΠΈΠ²Π°ΡŽΡ‰ΠΈΠ΅ ΠΊΠΎΡ€Ρ€Π΅ΠΊΡ‚Π½ΠΎΡΡ‚ΡŒ примСнСния Ρ€Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½Π½ΠΎΠΉ ΠΏΡ€ΠΎΡ†Π΅Π΄ΡƒΡ€Ρ‹ оцСнивания.Π‘ΠΏΠ΅Ρ†ΠΈΠ°Π»ΡŒΠ½ΠΎΠΉ ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌΠΎΠΉ ΠΏΡ€Π΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅Ρ‚ΠΎΠ΄Π° являСтся ΠΎΠΏΡ€Π΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ уровня точности аппроксимации зависимой ΠΏΠ΅Ρ€Π΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ. Π’ связи с этим для ΠΎΡ†Π΅Π½ΠΊΠΈ уровня точности статистичСской ΠΌΠΎΠ΄Π΅Π»ΠΈ, Π²Π΅Ρ€ΠΈΡ„ΠΈΡ†ΠΈΡ€ΡƒΠ΅ΠΌΠΎΠΉ ΠΏΡ€ΠΈ ΠΏΠΎΠΌΠΎΡ‰ΠΈ ΠΠœΠ›Π , Ρ€Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½ ΠΎΡ€ΠΈΠ³ΠΈΠ½Π°Π»ΡŒΠ½Ρ‹ΠΉ ΠΌΠ΅Ρ‚ΠΎΠ΄ Π΄Π΅ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ†ΠΈΠΈ Π²Ρ€Π΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ряда Π½Π° Ρ€Π΅Π³ΡƒΠ»ΡΡ€Π½ΡƒΡŽ ΠΈ ΡΡ‚ΠΎΡ…Π°ΡΡ‚ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚Ρ‹. ΠŸΡ€ΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡ€ΠΎΠ²Π°Π½Ρ‹ свойства ΠΏΡ€Π΅Π΄Π»Π°Π³Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΌΠ΅Ρ‚ΠΎΠ΄Π° Π΄Π΅ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ†ΠΈΠΈ ΠΈ Π΄Π°Π½Π° числовая ΠΈΠ»Π»ΡŽΡΡ‚Ρ€Π°Ρ†ΠΈΡ Π΅Π³ΠΎ примСнСния Π² экономСтричСских расчСтах

    ΠžΠ±Ρ€Π°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ Π² эпоху «экономики Π·Π½Π°Π½ΠΈΠΉΒ»

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    Features of modern economy as "economy of knowledge" are defined. The changes happening in education in the conditions of strengthening of a role of knowledge in economic life of society are considered. Tasks of modern universities in production of knowledge are characterized, connection of the state, universities and business is shown. The main directions of development of modern education in the conditions of emergence of new educational technologies and pressure of market forces are proved. Proposals of rectors of higher education institutions about revival of engineering education in the Russian Federation are systematized.ΠžΠΏΡ€Π΅Π΄Π΅Π»Π΅Π½Ρ‹ особСнности соврСмСнной экономики ΠΊΠ°ΠΊ «экономики Π·Π½Π°Π½ΠΈΠΉΒ». РассмотрСны измСнСния, происходящиС Π² ΠΎΠ±Ρ€Π°Π·ΠΎΠ²Π°Π½ΠΈΠΈ Π² условиях усилСния Ρ€ΠΎΠ»ΠΈ Π·Π½Π°Π½ΠΈΠΉ Π² экономичСской ΠΆΠΈΠ·Π½ΠΈ общСства. ΠžΡ…Π°Ρ€Π°ΠΊΡ‚Π΅Ρ€ΠΈΠ·ΠΎΠ²Π°Π½Ρ‹ Π·Π°Π΄Π°Ρ‡ΠΈ соврСмСнных унивСрситСтов Π² производствС Π·Π½Π°Π½ΠΈΠΉ, ΠΏΠΎΠΊΠ°Π·Π°Π½Π° связь государства, унивСрситСтов ΠΈ бизнСса. ΠžΠ±ΠΎΡΠ½ΠΎΠ²Π°Π½Ρ‹ основныС направлСния развития соврСмСнного образования Π² условиях появлСния Π½ΠΎΠ²Ρ‹Ρ… ΠΎΠ±Ρ€Π°Π·ΠΎΠ²Π°Ρ‚Π΅Π»ΡŒΠ½Ρ‹Ρ… Ρ‚Π΅Ρ…Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ ΠΈ давлСния Ρ€Ρ‹Π½ΠΎΡ‡Π½Ρ‹Ρ… сил. БистСматизированы прСдлоТСния Ρ€Π΅ΠΊΡ‚ΠΎΡ€ΠΎΠ² Π²ΡƒΠ·ΠΎΠ² ΠΎ Π²ΠΎΠ·Ρ€ΠΎΠΆΠ΄Π΅Π½ΠΈΠΈ ΠΈΠ½ΠΆΠ΅Π½Π΅Ρ€Π½ΠΎΠ³ΠΎ образования Π² Π Π€

    Electrical discharges in the atmosphere of Venus

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    Data received from Venera 11 and 12 experiments involving the electrical activity of the atmosphere of Venus show that the electrical discharges occur in the cloud layer. Their energy is roughly the same as in terrestrial lightning, but with a pulse repetition frequency of the discharges which is much greater

    Cement-free binders for radioactive waste produced from blast-furnace slag using vortex layer activation technology

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    The paper addresses the issue of recycling granulated blast-furnace slag (gBFS) as a source for production of cement-free binder materials for further usage in rare-earth metals production for radioactive waste disposal. The use of the vortex layer activator was provided as main technique allowing to produce high-dispersed chemically activated binders. The paper examines the effect of processing conditions on the physical-chemical and mechanical properties of the resulting BFS-based cement-free materials and gBFS-based concretes

    Π•ΠΊΠΎΠ½ΠΎΠΌΡ–Ρ‡Π½Π° Π±Π΅Π·ΠΏΠ΅ΠΊΠ° суб’єктів Π³ΠΎΡΠΏΠΎΠ΄Π°Ρ€ΡŽΠ²Π°Π½Π½Ρ Π² ΡƒΠΌΠΎΠ²Π°Ρ… ΠΏΠ°Π½Π΄Π΅ΠΌΡ–Ρ— COVID-19: характСристика Π·Π°Π³Ρ€ΠΎΠ·

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    Π‘ΡƒΠ²ΠΎΡ€ΠΎΠ² Н. О. Π•ΠΊΠΎΠ½ΠΎΠΌΡ–Ρ‡Π½Π° Π±Π΅Π·ΠΏΠ΅ΠΊΠ° суб’єктів Π³ΠΎΡΠΏΠΎΠ΄Π°Ρ€ΡŽΠ²Π°Π½Π½Ρ Π² ΡƒΠΌΠΎΠ²Π°Ρ… ΠΏΠ°Π½Π΄Π΅ΠΌΡ–Ρ— COVID-19: характСристика Π·Π°Π³Ρ€ΠΎΠ· / Н. О. Π‘ΡƒΠ²ΠΎΡ€ΠΎΠ² // Бучасні ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌΠΈ ΠΏΡ€Π°Π²ΠΎΠ²ΠΎΠ³ΠΎ, Π΅ΠΊΠΎΠ½ΠΎΠΌΡ–Ρ‡Π½ΠΎΠ³ΠΎ Ρ‚Π° ΡΠΎΡ†Ρ–Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ Ρ€ΠΎΠ·Π²ΠΈΡ‚ΠΊΡƒ Π΄Π΅Ρ€ΠΆΠ°Π²ΠΈ : Ρ‚Π΅Π·ΠΈ Π΄ΠΎΠΏ. ΠœΡ–ΠΆΠ½Π°Ρ€. Π½Π°ΡƒΠΊ.-ΠΏΡ€Π°ΠΊΡ‚. ΠΊΠΎΠ½Ρ„. (ΠΌ. Π₯Π°Ρ€ΠΊΡ–Π², 27 листоп. 2020 Ρ€.). – Π₯Π°Ρ€ΠΊΡ–Π², 2020. – Π‘. 233 - 234.Π’ статті Π·Π°Π·Π½Π°Ρ‡Π°Ρ”Ρ‚ΡŒΡΡ, Ρ‰ΠΎ Π·Π°Π³Ρ€ΠΎΠ·ΠΈ Π΅ΠΊΠΎΠ½ΠΎΠΌΡ–Ρ‡Π½Ρ–ΠΉ Π±Π΅Π·ΠΏΠ΅Ρ†Ρ– суб’єктів Π³ΠΎΡΠΏΠΎΠ΄Π°Ρ€ΡŽΠ²Π°Π½Π½Ρ, які спричинСні ввСдСнням ΠΏΡ€ΠΎΡ‚ΠΈΠ΅ΠΏΡ–Π΄Π΅ΠΌΡ–Ρ‡Π½ΠΎΠ³ΠΎ ΠΊΠ°Ρ€Π°Π½Ρ‚ΠΈΠ½Ρƒ, ΠΌΠ°ΡŽΡ‚ΡŒ об’єктивний Ρ…Π°Ρ€Π°ΠΊΡ‚Π΅Ρ€, пов’язані Π· форс-ΠΌΠ°ΠΆΠΎΡ€Π½ΠΈΠΌΠΈ обставинами, Π²ΠΈΠ½ΠΈΠΊΠ»ΠΈ Ρ€Π°ΠΏΡ‚ΠΎΠ²ΠΎ Ρ– Π½Π΅ ΠΌΠΎΠ³Π»ΠΈ Π±ΡƒΡ‚ΠΈ ΠΏΠ΅Ρ€Π΅Π΄Π±Π°Ρ‡Π΅Π½Ρ–. ΠžΡΠΊΡ–Π»ΡŒΠΊΠΈ ΠΊΠ°Ρ€Π°Π½Ρ‚ΠΈΠ½ Ρ” адміністративним Π·Π°Ρ…ΠΎΠ΄ΠΎΠΌ Π΄Π΅Ρ€ΠΆΠ°Π²Π½ΠΎΠ³ΠΎ Ρ€Π΅Π³ΡƒΠ»ΡŽΠ²Π°Π½Π½Ρ, Π΄Π΅Ρ€ΠΆΠ°Π²Π° ΠΌΠ°Ρ” Ρ€ΠΎΠ·Π΄Ρ–Π»ΠΈΡ‚ΠΈ Π· суб’єктами Π³ΠΎΡΠΏΠΎΠ΄Π°Ρ€ΡŽΠ²Π°Π½Π½Ρ Ρ‚Ρ– Π²Ρ‚Ρ€Π°Ρ‚ΠΈ, Ρ‰ΠΎ Π²ΠΎΠ½ΠΈ понСсли Ρƒ зв’язку Π· ΠΉΠΎΠ³ΠΎ ввСдСнням. Π’ ΡΡ‚Π°Ρ‚ΡŒΠ΅ отмСчаСтся, Ρ‡Ρ‚ΠΎ ΡƒΠ³Ρ€ΠΎΠ·Ρ‹ экономичСской бСзопасности ΡΡƒΠ±ΡŠΠ΅ΠΊΡ‚ΠΎΠ² хозяйствования, Π²Ρ‹Π·Π²Π°Π½Π½Ρ‹Π΅ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ΠΌ противоэпидСмичСского ΠΊΠ°Ρ€Π°Π½Ρ‚ΠΈΠ½Π°, ΠΈΠΌΠ΅ΡŽΡ‰ΠΈΡ… ΠΎΠ±ΡŠΠ΅ΠΊΡ‚ΠΈΠ²Π½Ρ‹ΠΉ Ρ…Π°Ρ€Π°ΠΊΡ‚Π΅Ρ€, связанныС с форс-ΠΌΠ°ΠΆΠΎΡ€Π½Ρ‹ΠΌΠΈ ΠΎΠ±ΡΡ‚ΠΎΡΡ‚Π΅Π»ΡŒΡΡ‚Π²Π°ΠΌΠΈ Π²ΠΎΠ·Π½ΠΈΠΊΠ»ΠΈ Π²Π½Π΅Π·Π°ΠΏΠ½ΠΎ ΠΈ Π½Π΅ ΠΌΠΎΠ³Π»ΠΈ Π±Ρ‹Ρ‚ΡŒ прСдусмотрСны. ΠŸΠΎΡΠΊΠΎΠ»ΡŒΠΊΡƒ ΠΊΠ°Ρ€Π°Π½Ρ‚ΠΈΠ½ являСтся административной ΠΌΠ΅Ρ€ΠΎΠΉ государствСнного рСгулирования, государство Π΄ΠΎΠ»ΠΆΠ½ΠΎ Ρ€Π°Π·Π΄Π΅Π»ΠΈΡ‚ΡŒ с ΡΡƒΠ±ΡŠΠ΅ΠΊΡ‚Π°ΠΌΠΈ хозяйствования ΠΏΠΎΡ‚Π΅Ρ€ΠΈ, ΠΊΠΎΡ‚ΠΎΡ€Ρ‹Π΅ ΠΎΠ½ΠΈ понСсли Π² связи с Π΅Π³ΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ΠΌ. The article states that the threats to the economic security of economic entities that are caused introduction of anti-epidemic quarantine, are objective in nature, related to force majeure, arose suddenly and could not be foreseen. Because quarantine is an administrative measure of state regulation, the state must divide with business entities the losses they have incurred in connection with its introduction

    Basic principles of descriptive statistics in medical research

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    Descriptive statistics provides tools to explore, summarize and illustrate the research data. In this tutorial we discuss two main types of data – qualitative and quantitative variables, and the most common approaches to characterize data distribution numerically and graphically. This article presents two important sets of parameters – measures of the central tendency (mean, median and mode) and variation (standard deviation, quantiles) and suggests the most suitable conditions for their application. We explain the difference between the general population and random samples, that are usually analyzed in studies. The parameters which characterize the sample (for example, measures of the central tendency) are point estimates, that can differ from the respective parameters of the general population. We introduce the concept of confidence interval – the range of values, which likely includes the true value of the parameter for the general population. All concepts and definitions are illustrated with examples, which simulate the research data
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