Факультет електроніки та інформаційних технологій (ЕлІТ)

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3D-друк в медицині
(Сумський державний університет, 2014) Безверха, Т.М.
На сьогоднішній день технічний процес вже дійшов до такого рівня, що те, що раніше здавалось нам неможливим та недосяжним, зараз можна втілити у повсякденному житті. Наприклад, 3D- друк, про який раніше ми могли дізнатися лише з фантастичних романів, сьогодні все це вже відбувається з нами.
3D-модель легкого позашляховика "баггі". Використання засобів SolidWorks в тривимірному моделюванні
(Сумський державний університет, 2013) Брижахін, Є.В.; Гонтарєв, А.А.
На сьогодні тривимірне моделювання вважається перспективним напрямком роботи. Вважається, що запорукою успіху в сучасному промисловому виробництві є скорочення терміну виходу продукції на ринок і зниження собівартості. До числа найбільш ефективних технологій, що дозволяють досягти цих вимог, належать так називані CAD/CAM/CAE-системи (системи автоматизованого проектування, технологічної підготовки виробництва й інженерного аналізу).
A First Principles Study of Chalcopyrite Mn-doped AlGaP2 Compounds
(Sumy State University, 2015) Kang, Byung-Sub; Song, Kie-Moon
We studied the electronic and magnetic properties for the Mn-doped chalcopyrite AlGaP2 semiconductor by using the first-principles calculations. The Mn-doped AlGaP2 yields strong half-metallic ground states. The ferromagnetic state is the most energetically favorable one. The states of host Al, Ga, or P atoms at the Fermi level are mainly a P-3p character, which mediates a strong interaction between the Mn-3d and P-3p states. The ferromagnetic ordering of dopant Mn with high magnetic moment is originated from the P(3p)-Mn(3d)-P(3p) hybridization, which is attributed by the partially filled P-3p bands. The high magnetic moment of Mn by P vacancy is produced by 4.2 μB/Mn.
A Novel Study of Electrospun Nanofibers Morphology as a Function of Polymer Solution Properties
(Sumy State University, 2013) Nasouri, K.; Haji, A.; Shoushtari, A.M.; Kaflou, A.
Electrospinning is a process of production fibers with diameters ranging from the submicron down to the nanometer size by applying a high voltage to a polymer solution. The important parameters in the morphology of electrospun polymer fibers are polymer structure, polymer solution properties, processing conditions, and ambient parameters. In the present work electrospinning of polyacrylonitrile (PAN) has been attempted to generate uniform nanofibers without beads. Electrospinning was performed at various concentrations ranging from 4 to 18 w/v%. The effects of polymer solution properties on electrospinnability of the PAN/DMF solutions have investigated. Fiber morphology was observed under a scanning electron microscopy (SEM). For the polymer electrospun from low concentration (Be<2), polymer droplets have formed. For the polymer electrospun from semi-dilute solution concentration (24. The relationship between solution viscosity and its concentration is in the form: η 0.0205C4.16 and relation between the diameter of electro-spun the PAN nanofiber and solution concentration is in the form: d 0.0326C3.45. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35141
A Review In Preparation of Electronic Ink for Electrophoretic Displays
(Sumy State University, 2014) Kholghi Eshkalak, S; Khatibzadeh, M.
Electrophoretic displays attracted a lot of attention recently due to its low cost, low weight, low power consumption and reliability. Based on these characteristics, they are going to replace the conventional paper. Electrophoretic displays are called non- emitting displays based on light particle suspensions. They behave as motion of charged particles in a dielectric fluid towards the electrodes with the opposite charge. Electrical and optical properties of electrophoretic displays suspension composition are dependent on the electronic ink that is called E- ink. Thus, key factors in determining image quality depended on electrophoretic particle properties. Enhancing the great image quality for accurate image control and faster response to the voltage applied is dependent on the very small particle size, narrow size distribution and high surface charge of particles. So a lot of research has been done on the modification of particles, surface morphology, surface charge and their stability in media. Therefore, this article reviews the studies of these topics.
A self-assembly of nanoparticles
(Sumy State University, 2014) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Бадалян, Анна Юріївна; Бадалян, Анна Юрьевна; Badalian, Anna Yuriivna; Bratash, S.O.
Nanotechnology achievements are often connected to material science because the design of a wide range of advanced nanostructured materials will reduce the size of the components of many devices. But nanoscience today is more interested in the formation of nanoassemblies and further coupling of them into the nanostructured materials.
A Stochastic Model of Stick-Slip Boundary Friction with Account for the Deformation Effect of the Shear Modulus of the Lubricant
(Allerton Press, Inc., 2010) Хоменко, Олексій Віталійович; Хоменко, Алексей Витальевич; Khomenko, Oleksii Vitaliiovych; Ляшенко, Яків Олександрович; Ляшенко, Яков Александрович; Liashenko, Yakiv Oleksandrovych
The melting of an ultrathin lubricating film during the friction of two solid atomically smooth surfaces is studied within the limits of the Lorentz model that approximates a viscoelastic medium, the deformation effect of the shear modulus being taken into account. It is shown that the action of a random force representing additive non-correlated noise results in the sustained oscillation mode that corresponds to stickslip friction. The numerical modeling of the process yields the ratios between the relaxation times at which the stick-slip mode is characterized by a high amplitude. The amplitude of stick-slip transitions is found to decrease as the shear modulus of the lubricant increases. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/18093
Abrasion Resistance of Ag/SiO2/PA6 Nanocomposite Fabrics
(Sumy State University, 2013) Fasahat, F.; Dastjerdi, R.; Dastjerdi, M.R.M.
In recent decades, polymeric nanocomposites have been widely used in chemical, automobile and aero industries due to their low weight and smoothness. Abrasion resistance is a vital property in variable ap-plications of polymeric composites. Here, to investigate the wear resistance of nylon 6 nanocomposite fab-rics, melt spun yarns were filled with different concentrations of Ag/SiO2 nanoparticles and the wear prop-erties of weft knitted nanocomposite and pure samples were evaluated. Results disclosed that the wear re-sistance of composite fabrics containing nano-particles increased considerably in comparison to pure one. Therefore, nanoparticles can play an important role in improving the nanocomposite wear resistance. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35638
Analysis of ergonomics problems contact-centers
(Sumy State University, 2016) Криводуб, Анна Сергіївна; Криводуб, Анна Сергеевна; Kryvodub, Anna Serhiivna; Шапочка, Юрій Миколайович; Шапочка, Юрий Николаевич; Shapochka, Yurii Mykolaiovych; Лавров, Євгеній Анатолійович; Лавров, Евгений Анатольевич; Lavrov, Yevhenii Anatoliiovych
The analysis of the ergonomic problems of the contact center. It allocates main factors of influence on man- operator.
Antimicrobial resistance. Causes and solving
(Sumy State University, 2018) Haykova, O.O.
One of the triumphs of modern medicine is the development of antibiotics and other antimicrobial agents. The basis of the action of antibacterial drugs is to suspend the activity of pathogens due to inhibition of metabolic-specific microorganisms. But today the development of resistance to them by microbes begins to become challenge for scientists.
Application of Nanocomposite Coatings with Different Structural Physical and Chemical Characteristics in Tissue Engineering
(Sumy State University, 2012) Rassokha, I.V.; Dubrava, T.G.; Ostankova, L.V.; Ostankov, M.V.; Gordienko, E.A.; Safonov, V.I.; Zykova, A.V.; Goltsev, A.N.
The research covers the results of experimental studies of the effect character of nanocomposite coatings with different physical and chemical parameters (type, roughness, hydrophilic-hydrophobic characteristics) on structural and functional properties (adhesive potential, phenotype, gene expression) of mesenchymal stem cells (MSCs). On the tested nanocoatings (Al2O3, ZrO2, Ta2O5) the capability of oxide coating Al2O3 to enrich the in vitro cultured bone marrow (BM) with the cells of MSCs phenotype markers as well as to increase the expression rate of ido gene in them, which may extend the spectrum of their therapeutic application in clinics, has been found. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34963
Application of simulation technologies to the investigation of the beam generating systems
(Sumy State University, 2011) Барсук, Іван Володимирович; Барсук, Иван Владимирович; Barsuk, Ivan Volodymyrovych; Бондар, Олександр В`ячеславович; Бондарь, Александр Вячеславович; Bondar, Oleksandr Viacheslavovych; Дрозденко, Олексій Олександрович; Дрозденко, Алексей Александрович; Drozdenko, Oleksii Oleksandrovych; Воробйов, Геннадій Савелійович; Воробьев, Геннадий Савельевич; Vorobiov, Hennadii Saveliiovych
A series of numerical calculations of electron beam generation in the threeelectrode electron-optical system has been performed with the help of the electromagnetic modeling FIT method both with the PBA technology. Effects of the initial blocking and ray laminarity failure have been modeled. Optimum electrode potentials have been obtained for generation of the low-energy intensive axial-symmetric electron beam with beam-crossover behind the last anode of electron gun. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20807
Basis of the Language for the Business Processes Description in Information Systems
(Sumy State University, 2016) Захарченко, Вікторія Петрівна; Захарченко, Виктория Петровна; Zakharchenko, Viktoriia Petrivna; Окопний, Руслан Петрович; Окопный, Руслан Петрович; Okopnyi, Ruslan Petrovych; Марченко, Анна Вікторівна; Марченко, Анна Викторовна; Marchenko, Anna Viktorivna; Lyubomirova, E.
The automation of business processes performance provides the computerization of management processes in information systems. It is possible to achieve this aim using the strict formal description of the automation object. The main idea of the proposed approach consists in the basic description of business processes on the basis of the formal language that allows to model, to design and to verify the program implementation of the management system and the business process model. The language for the description of the business processes performance is developed for the implementation of the main ideas of the management theory as an option of the logical-mathematical language.
Bionic eye
(Сумський державний університет, 2014) Harbuzova, Yelizaveta Antonivna; Гарбузова, Єлізавета Антонівна; Гарбузова, Елизавета Антоновна
In modern life there are a lot of diseases. Scientists and researchers from all over the world investigate these diseases and try to find the newest ways of treating them. One of such troubles is problem with eyes. Very often people lose vision because of damaging their eyes or degenerative disease, for example, age-related macular degeneration.
Biphenyl Molecules as Elements of Nanoelectronics in the Electric Field
(Sumy State University, 2012) Лопаткін, Юрій Михайлович; Лопаткин, Юрий Михайлович; Lopatkin, Yurii Mykhailovych; Шовкопляс, Оксана Анатоліївна; Шовкопляс, Оксана Анатольевна; Shovkoplias, Oksana Anatoliivna; Kondratenko, P.O.
This paper presents the results of investigations of the influence of the longitudinal and transverse electric field on the potential surface, the dipole moment and electronic spectra of the substituted biphenyl molecules that are offered for the role of the elements of nanoelectronics. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35480
Brownian Rotational Motion of Ferromagnetic Nanoparticle in Liquid
(Sumy State University, 2014) Лютий, Тарас Володимирович; Лютый, Тарас Владимирович; Liutyi, Taras Volodymyrovych; Денисов, Станіслав Іванович; Денисов, Станислав Иванович; Denysov, Stanislav Ivanovych; Reva, V.V.
Langevin and Fokker Planck equations are considered for stochastic spherical motion of the ferromagnetic fine particle with frozen magnetic moment in a viscous carrier. Special attention devotes to the correspondence between dissipative and diffusive terms of these equations. For the case when the particle moment of inertia is negligible small, the effective system of Langevin equation for spherical coordinates is obtained. This system contains two equations with additive noises and can be readily treated numerically. We confirm our analytical finding by numerical simulation.
Calculation of Current-Voltage Characteristics of the Optimized Triode with a Cold Cathode Based on the Ordered Array of Single-Wall Metallic Carbon Nanotubes
(Sumy State University, 2013) Pozdnyakov, D.V.; Borzdov, A.V.; Borzdov, V.M.
The current-voltage characteristics of a triode with the plane-parallel electrodes and a cold cathode based on the ordered array of single-wall metallic carbon nanotubes with open ends have been calculated by means of a numerical solution of both the Poisson equation and the quantum-wave equation. The topological parameters of the triode have been optimized. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35361
Calculation of the Stability of the Fiber Ring Laser with Liquid Crystal Polarization Controllers
(Sumy State University, 2018) Hnatenko, О.S.; Obozna, V.P.
To date, with the ultra-short pulse lasers are used in many areas of science and technology, including information technology. The main task of creating such lasers is to provide output radiation with the shortest pulse duration. The shortest duration pulses achieved in fiber ring lasers with nonlinear rotating polarization modes, namely 20 fs. But in such lasers, there are a number of problems: stability of operation and tuning of the mode locking. This is due to the tuning of the mode-locked by rotating the wave plates in space manually.
Characterizations of Structural Properties of ZnO Thin Films Depending on the Experimental Conditions
(Sumy State University, 2015) Курбатов, Денис Ігорович; Курбатов, Денис Игоревич; Kurbatov, Denys Ihorovych; Климов, Олексій Володимирович; Климов, Алексей Владимирович; Klymov, Oleksii Volodymyrovych; Ladnyi, D.O.
Zinc oxide (ZnO) is one of the most promising materials for the fabrication of optoelectronic devices operating in the blue and ultra-violet (UV) spectral regions, owing to its direct wide band gap (Eg ~3.37 eV) and large exciton binding energy (~60 meV).
Combined reactive/non-reactive DC magnetron sputtering of high temperature composite AlN–TiB2–TiSi2
(Elsevier, 2016) Pshyk, A.V.; Coy, L.E.; Yate, L.; Załęski, K.; Nowaczyk, G.; Jurga, J.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych
High temperature composite target AlN–TiB2–TiSi2 with heterogeneous distribution of compounds (AlN—50 wt.%; TiB2—35 wt.%; TiSi2—15 wt.%) is used for sputtering via combined reactive/non-reactive DC magnetron sputtering onto substrate materials either cylindrical polished steel (Fe, 18%—Ni, 12%—Cr, 10%—Ti) 3 mm diameter or monocrystalline silicon. The gradient coating has been produced by sequential non-reactive and reactive sputtering of the target. The structural and morphological properties of the deposited films are analyzed by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. The tribo-mechanical properties are studied by means of nanoindentation and nanowear tests. The gradient film is composed of two layers with different microstructure and elemental composition. The first layer with thickness ~200 nm is mainly based on light B, C and N as well metal elements Al, Si and Ti. The presence of very well distributed nanocrystals embedded in an amorphous matrix, with crystal sizes ranging from 5 to 40 nm is observed in the second layer ~700 nm thickness and composed of Al, Ti, Si, B, and N. Films show very flat surfaces, with roughness around 0.35 nm. The hardness, elastic modulus, elastic recovery (We), H/E⁎ ratio and H3 /E⁎2 ratio are determined as 17.55 GPa, 216.7 GPa, 60%, 0.08 and 0.12 GPa, respectively. Nanowear tests demonstrate relatively high wear resistance of the coatings. Samples show promising characteristics for hard protective adaptive coatings and diffusion barriers due to short propagation of dislocations in the amorphous matrix and the elastic and hard nature of the nanocomposite structure.