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3. Analytical construction of regulators for oscillatory systems with liquid dampers

Author

Aliev, F. A., Aliev, N. A., and Ismailov, N. A.

Subjects
Mathematics - Dynamical Systems
Abstract

A mathematical model of oscillatory systems control with liquid dampers is considered which differs from the classical ones by replacing the first derivative of such a fractional derivative that is between numbers 0 and 2 other than unity. Using the methods of constructing Letov controllers, a control law is constructed that ensures the asymptotic stability of the closed system and minimizes the quadratic functional. The results are illustrated by a specific numerical example.

Published
2020

5. Representation of the Mittag-Leffler function through the exponential functions in the case of rational derivatives

Author

Aliev, Fikret A., Aliev, N. A., and Safarova, N. A.

Subjects
Mathematics - Classical Analysis and ODEs, Mathematics - Dynamical Systems, 33E12
Abstract

In this paper the Mittag-Leffler function is given through the exponential functions for any rational derivatives of m/n order, where m1 are natural irreducible numbers (if n=1 then m is also equal to unity). Unlike the previous papers the given formulas do not contain integrals., Comment: in Russian

Published
2019

6. Method of discretizing of fractional-derivative linear systems of ordinary differential equations with constant coefficients

Author

Aliev, Fikret A., Aliev, N. A., Velieva, N. I., Gasimova, K. G., and Mamedova, Y. V

Subjects
Mathematics - Dynamical Systems, 49J15, 49J35
Abstract

An exact discretization method is being developed for solving linear systems of ordinary fractional-derivative differential equations with constant matrix coefficients (LSOFDDECMC). It is shown that the obtained linear discrete system in this case does not have constant matrix coefficients. Further, this method is compared with the known approximate method. The above scheme is developed for arbitrary linear systems with piecewise constant perturbations. The results are applied to the discretization of linear controlled systems and are illustrated with numerical examples., Comment: in Russian

Published
2019

8. Solving the linear fractional derivatives ordinary differential equations with constant matrix coefficients

Author

Aliev, Fikret A., Aliev, N. A., Safarova, N. A., Kasimova, K. G., and Velieva, N. I

Subjects
Mathematics - Dynamical Systems
Abstract

The Cauchy problem for fractional derivatives linear systems of ordinary differential equations with constant coefficients is considered, where at first the analytic expressions are given through the matrix exponent of its corresponding solution. On the basis of the obtained results the conditions are given, providing the asymptotic stability of the initial system. The results are illustrated on the numerical example, where it is shown that when the order of the fractional derivative tends to unity, so the solution tends to the corresponding exponential function., Comment: in Russian

Published
2018

9. Transformation Mittag-Lefler function to an exponential function and its some applications to problems with a fractional derivative

Author

Aliev, Fikret A., Aliev, N. A., Safarova., N. A., and Gasimova, K. G.

Subjects
Mathematics - Dynamical Systems
Abstract

In this work at first the relation the Mittag-Lefler function to the exponential is given. The results are applied to the construction of the solution of Cauchy problem for ordinary linear operator differential equations with constant coefficients and fractional derivatives. On the example is shown that when the order of the derivatives (fractional) approaches to integers the results coincide with the classical., Comment: in Russian

Published
2018

11. A METHOD FOR THE DISCRETIZATION OF LINEAR SYSTEMS OF ORDINARY FRACTIONAL DIFFERENTIAL EQUATIONS WITH CONSTANT COEFFICIENTS

Author

Aliev, F.A., Aliev, N. A., Velieva, N.I., and Gasimova, K.G.

Subjects
Linear systems -- Methods -- Analysis, Differential equations -- Analysis -- Methods, Mathematics
Abstract

We develop an exact discretization method for the solution of linear systems of ordinary fractional differential equations with constant matrix coefficients. It is shown that, in this case, the obtained linear discrete system does not have constant matrix coefficients. The proposed method is compared with the well-known approximate method. The presented scheme is developed for any linear systems with piecewise constant perturbations. The obtained results are used for the discretization of linear controlled systems and are illustrated by numerical examples., Introduction In recent years, much attention is given to the Cauchy problem and various boundary-value problems for differential equations of fractional orders [1-11]. It is possible to show that, in [...]

Published
2021
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12. Comparative evaluation of freeze-dried and hot air-dried Spirulina Platensisextracts as green inhibitors for mild steel corrosion

Author

Seghiri, R., Rbaa, M., Rouifi, Z., Moussaif, A., Berdimurodov, E., Demir, M., Aliev, N., and Legrand, J.

Abstract

ABSTRACTSpirulina, a commercially farmed cyanobacteria, offers potential as a nontoxic corrosion inhibitor. However, traditional drying methods deteriorate its protective feature and this challenge must be overcome to enhance corrosive resistance. The present study compares the corrosive inhibitor performance of Spirulina extracts from freeze (SP1) and hot air drying (SP2). The electrochemical and microscopic techniques revealed that freeze-dried-derived Spirulina inhibited over 90% of corrosion through the chemisorption process where freeze-dried-derived Spirulina maximises the inhibitory compounds binding to steel. Polarisation measurements showed that SP1 provided higher inhibition efficiencies of over 93% at certain concentrations compared to around 88% for SP2. At the optimal concentration of 2 g/L, Rp values increased from 35.17 Ω/cm2(uninhibited) to 531.3 Ω/cm2for SP1 and 282.7 Ω/cm2for SP2. Negative ΔGadsvalues (−42.4 kJ/mol for SP2, −46.3 kJ/mol for SP1) and Langmuir isotherm fit indicated chemisorption-controlled adsorption. SEM/EDX showed SP1 and SP2 formed barrier layers inhibiting surface damage compared to blank steel. SP1 layer provided better protection. In short, through innovative applications of marine resources, greener corrosion management is enabled.

Published
2024
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17. Investigation of solutions of boundary value problems for a composite type equation with non-local boundary conditions

Author

Aliev, N. A. and Aliev, A. M.

Subjects
Mathematics - Analysis of PDEs
Abstract

Since the order of elliptic type model equation (Laplace equation) is two [1], [2], then it is natural the order of composite type model equation must be [3] [4] [5] three. At each point of the domain under consideration these equations have both real and complex characteristics. Notice that a boundary value problem for a composite type equation of second order first appeared in the paper [6]. The method for investigating the Fredholm property of boundary value problems is distinctive and belongs to one of the authors of the present paper., Comment: 6 pages

Published
2008

18. CONTROL OF THE GRADUAL COKING PROCESS

Author

Aliev N. and Maharramova T.

Subjects
coking process, technological process, oil fractions, petroleum coke, quality indicators
Abstract

At present, the policy of producing oil fractions around the world is an urgent need. In this regard, the rapid world economy development at the same time, causes its dependence on oil. At such a time, the most pressing issue is the correct and efficient resulting crude oil processing [1÷4]. Taking into account energy efficiency, certain requirements are imposed to improve the quality indicators of the obtained oil fractions [5, 6]. Given the need for petroleum coke, the such a technological process control is a very important issue., References: 1. Guseinov I.A., Melikov E.A., Khanbutaeva N.A., Efendiev I.R. Models and algorithms for a multilevel control system of primary oil refinery installations. Journal of Computer and Systems Sciences International. SP MAIK Nauka/Interperiodica, Pleiades Publishing, Ltd., 2012, Vol. 51, No. 1, pp. 148-156. 2. Guseinov I.A., Kurbanov Z.G., Melikov E.A., Efendiev A.I., Efendiev I.R. Nonstationary multistage process control in the petrochemical industry. Journal of Computer and Systems Sciences International, Pleiades Publishing, Ltd. Vol. 53, No. 4, 2014, pp. 556-564. 3. Melikov E.A. Algorithm optimization static rejimes installation of primary oil refining/Melikov E.A., Xanbutaeva N.A. National Science Review. – Chinese Academy of Sciences, Oxford University Press, Issue 4 (2), vol. 4, 2017, pp. 1459-1466. 4. Ibragimov I.A., Efendıyev I.R., Kopysitskii V.T., Melikov E.A. Desıgn prıncıples of self-learnıng automatıc-control systems for complex technologıcal processes under condıtıons of ınformatıon defıcıency. Doklady Akademıı Nauk SSSR, 1991/1/1, Mezhdunarodnaya Knıga, vol. 320, No. 6, pp. 1424-1427. 5. Aliev M.S., Maharramova T.M., Melikov E.A. Changes in world energy consumption. Ekoenergetics, Baku, 2022, No. 1, pp. 46-48. 6. Maharramova T.M., Melikov E.A. Energy saving system in vacuum unit. Ecoenergetics, Baku, 2022, No. 4, pp. 37-40. 7. Maharramova T.M., Melikov E.A. Power quality control for bitumen production. Ekoenergetics, Baku, 2022, No. 3, pp. 8-12.

Published
2023
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43. Bactericidal properties of carbamates acetylene amino alcohols

Author

ALİEV, N., ALLAMBERGENOVA, Z., and MAMYRBEKOVA, A.

Subjects
карбаматы,ацетиленовые аминоспирты,бактерицидные свойства,микроорганизмы,микробиологическая активность, Medicine, carbamate,acetylene amino alcohols,antibacterial properties,microorganisms,microbiological activity, карбаматтар,ацетилен аминспирттері,бактерицидтік қасиеттері,микроорганизмдер,микробиологиялық белсенділік, Tıp
Abstract

В работе синтезирован ряд ацетиленовых аминоспиртов, получены их фенилкарбаматы и исследована их микробиологическая активность. В качестве объектов микробиологических исследований были рассомтрены микроорганизмы: Bacillus subtilis; Botrytis cinerea, Echerchia coli, Ervinia caratovorum, Candida albicans, Fusarum solani и Helminthosporium Исследованы физико-химические и бактерицидные свойства N-фенилкарбаматов аминоспиртов ацетиленового спирта. Установлено, что указанные соединения проявляют высокую антимикробную активность против возбудителей некоторых болезней животных и расстений., In the work synthesized a number of acetylenic amino alcohols derived their phenylcarbamate and studied their microbiological activity. Microorganisms: Bacillus subtilis; Botrytis cinerea, Echerchia coli, Ervinia caratovorum, Candida albicans, Fusarum solani and Helminthosporium were considered as objects of microbiological studies. Synthesized some N-phenylcarbamate amino alcohols of acetylene alcohol and investigated their physical, chemical and microbiological properties. It was established that these compounds exhibit high antibacterial activity against pathogens of certain diseases of animals and plants., Жұмыста бірқатар ацетилен аминспирттері синтезделіп, олардың N-фенилкарбаматтары алынды және соңғыларының микробтарға қарсы әрекеті зерттелді. Микробиологиялық сынақ объектілері ретінде Bacillus subtilis; Botrytis cinerea, Echerchia coli, Ervinia caratovorum, Candida albicans, Fusarum solani және Helminthosporium сынды микроорганизмдер қарастырылды. Ацетилен қатары аминспирттерінің N-фенилкарбаматтарының физика-химиялық және бактерицидтік қасиеттері зерттелген. Аталмыш қосылыстардың жануарлар мен өсімдіктер ауруларын қоздыратын микроағзаларға қарсы пәрменділігінің жоғары екендігі көрсетілген.

Published
2018

47. ASSESSMENT OF AGRO-ECOLOGICAL CONDITION OF THE TERRITORY OF THE REPUBLIC OF TAJIKISTAN.

Author

ALIEV, N. N., CHURSIN, A. I., OKROS, A., NIȚĂ, L., MIHUȚ, Casiana, BORCEAN, A., and MĂRĂZAN, V.

Subjects
*DESERTS, *WATER quality, *WATER pollution, *MOUNTAIN ecology, *SEA level, *ZONING
Abstract

The territory of Tajikistan has unique natural and climatic conditions, and also differs in its complexities and characteristics. The article presents the division of the territory according to the geographic, geological and biological characteristics of the republic, gives an assessment of the ecological state of the territory of the Republic of Tajikistan, identifies the main problems in this area and proposes measures to eliminate them. For each of the newly created agricultural landscapes, depending on the altitude location, with certain violations, clear characteristics are given. Raise the issue of pollution of air and water basins of the republic, the sources of these pollution are given. Attention is focused on the quality of water, in connection with which the issue of the Aral Sea has been raised. Summarizing the highlighted environmental problems are noted, the required immediate measures to eliminate them. The elevation marks of the republic's relief surface range from 300 to 7500 meters above sea level. Such a range of heights in a relatively limited area, only 143.1 thousand square kilometers, predetermined a variety of natural and climatic conditions: from the sultry arid valleys of the South-West and North of the country to the high-altitude cold deserts of the Pamirs. Mountain ecosystems occupy from 600 to 7000 m above sea level. They concentrate from 70% to 80% of the species diversity of communities, as well as most of the summer pastures and forests. In the foothills and plains, semi-desert and desert zones are usually located. By geographic, geological and biological characteristics, the republic is divided into: Sughd-Zaravshan, Central-Tajikistan, South-Tajikistan, Gorno-Badakhshan ecological provinces. Thus, the territory of Tajikistan is represented by a variety of ecological provinces with unique natural and biological features. [ABSTRACT FROM AUTHOR]

Published
2021

48. The modern methodology for assessing investment lending and project financing

Author

Aliev, N. S., Разумовская, Е. А., Razumovskaya, E. A., УрФУ. Институт 'Высшая школа экономики и менеджмента', and Кафедра финансов, денежного обращения и кредита

Subjects
ПРОЕКТНОЕ ФИНАНСИРОВАНИЕ, ИНВЕСТИЦИОННЫЕ ПРОЕКТЫ, МАГИСТЕРСКАЯ ДИССЕРТАЦИЯ, РИСКИ, MASTER'S THESIS, ИНВЕСТИЦИОННОЕ КРЕДИТОВАНИЕ, PROJECT FINANCING, INVESTMENT PROJECTS, INVESTMENT LENDING, RISKS
Abstract

Выпускная квалификационная работа (магистерская диссертация) посвящена вопросам оценки потребности компании в проектном финансировании и инвестиционном кредитовании, что является условием развития экономических процессов во всей национальной экономике. Осуществление масштабных инвестиционных проектов должно быть подкреплено методологической базой, которая только формируется в России. Актуальность работы определяется высокими рисками, с которыми сопряжена реализация инвестиционного кредитования и проектного финансирования, что требует от инвестора применения всестороннего анализа и поиску путей нивелирования рисков. Graduation qualification work (master's thesis) is devoted to the assessment of the company's need for project financing and investment lending, which is a prerequisite for the development of economic processes throughout the national economy. Implementation of large-scale investment projects should be supported by a methodological base that is only being formed in Russia. The urgency of the work is determined by the high risks associated with the implementation of investment lending and project financing, which requires the investor to apply a comprehensive analysis and search for ways to level risks.

Published
2017

49. TRANSPORTATION OF A BVP INCLUDING GENERALIZED CAUCHY-RIEMANN EQUATION TO FREDHOLM INTEGRAL EQUATION.

Author

GOLANBAR, J. EBADPOUR, ALIEV, N., and JAHANSHAHI, M.

Subjects
CAUCHY-Riemann equations, LYAPUNOV functions, INTEGRAL equations, BOUNDARY value problems, MATHEMATICAL variables
Abstract

In this paper, a boundary value problem including generalized nonhomogenious Cauchy-Riemann equation with general nonlocal boundary conditions in a bounded planer region with Lyapunov line boundary is investigated. First, some states called compatibility conditions are obtained by making use of the generalized solution of Cauchy-Riemann equation. Then, the second kind of Fredholm integral equation for boundary values of the unknown of the main problem is resulted by applying and giving boundary condition. Finally, the singularities in integral kernels are removed or reduced to weak singularities by making use of the proposed method in this paper. [ABSTRACT FROM AUTHOR]

Published
2020

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