Внеуниверситетские публикации ученых БНТУ: Recent submissions
Now showing items 2541-2560 of 4461
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Thermodynamics of Multicomponent Amorphous Alloys: Theories and Experiment Comparison
(2017)On the basis of the existing thermodynamic theories of the amorphous matter (semi-empirical Miedema model and Shao theory), the integral (enthalpy and Gibbs energy) and partial molar characteristics of a multicomponent iron-based amorphous alloy are determined. It is demonstrated that for quaternary alloy Fe – 7.3 % Si – 14.2 % B – 8.26 % Ni these approaches give substantially ...2017-11-27 -
Феномен коммунизма и социал-демократизма: новое прочтение
(2017)В статье раскрываются научно-теоретические и практические аспекты коммунистической и социал-демократической идеологий, которые реализовывались на протяжении ХХ столетия. Автор рассматривает концептуальные положения коммунистической идеологии, выявляет ее прикладные формы в национально-специфических вариантах и характеризует основные черты социал-демократической идеологии. В статье ...2017-11-27 -
Организация мониторинга текущей успеваемости и посещаемости студентов
(2017)В статье рассматривается организация мониторинга текущей успеваемости и посещаемости студентов I и II курсов инженерно-педагогического факультета Белорусского национального технического университета2017-11-27 -
Свойства конструкционного бетона после пожара
(2017)Воздействие высоких температур на высокопрочный бетон приводит к проявлению хрупкого разрушения взрывного характера, которое необходимо прогнозировать и регулировать. С этой целью разработана методика на основе механики разрушения и предложены критерии оценки вязкости и хрупкости высокопрочного бетона и сталефибробетона для исключения взрывного разрушения при воздействии высоких ...2017-11-27 -
Совершенствование методики технологического проектирования состава ячеистого бетона
(2016)Предложена методика аналитического расчета величины удельного объема сухих компонентов ячеистого бетона исходя из величины истинной плотности исходных сырьевых компонентов и их соотношения в сырьевой смеси: отношения массы кремнеземистого компонента к массе вяжущего, соотношения цемента и извести, если это вяжущее смешанное. Для расчета истинной плотности смеси сухих компонентов ...2017-11-27 -
Модернизированный индекс человеческого развития
(2016)Для оценки эффективности устойчивого инновационного социально ориентированного развития экономики предложено использовать модернизированный индекс человеческого развития (ИЧР), который в отличие от традиционной методики формирования ИЧР ООН может учитывать 24 показателя жизненно важных интересов человека в социальной, экономической и экологической сферах2017-11-27 -
Экономическое стимулирование инновационной деятельности сотрудников вуза
(2016)Статья посвящена экономическому стимулированию инновационной деятельности сотрудников вуза. Проанализированы цели, приоритеты, принципы, функции и задачи кадровой политики в вузе. Разработан метод расчета величины стимулирующих премий за инновационную активность сотрудникам вуза.2017-11-24 -
Constructive Theory of Scalar Characteristic Equations of the Theory of Radiation Transport: II. Algorithms for Finding Solutions and Their Analytic Representations
(2015)We present methods for finding discrete spectra and derive analytic expressions for the eigenfunctions of scalar characteristic equations of the theory of radiation transport. We obtain new two-term recursion formulas and analytic representations for solutions of infinite tridiagonal systems of linear algebraic equations. We obtain analytic forms of the resolvents of scalar ...2017-11-23 -
Calculation of Residual Magnetic-Field Distributions upon Hysteretic Interference of a Pulsed Magnetic Field
(2015)Equations that are used for the calculation and distributions of the electrical voltage U(t) output from a magnetic-field transducer as it scans a discrete magnetic medium with recorded residual magnetic fields, which were produced in it by acting individual magnetic-field pulses with opposite-polarity surges, are reported. The distributions were obtained via the Delphi programming ...2017-11-23 -
The Shape of the Magnetic Fluid Surface above a Magnetizable Sphere in a Uniform Magnetic Field
(2015)The shape of the free surface of a magnetic fluid above a spherical ferromagnetic body immersed in it in a uniform magnetic field is investigated experimentally. The effect of the direction and magnitude of the magnetic field on the deformation characteristics of the free surface of the magnetic fluid with various magnetic properties and geometrical parameters is established.2017-11-23 -
Damping of a Solution of Linear Autonomous Difference–Differential Systems with Many Delays Using Feedback
(2015)For linear autonomous difference-differential systems with commensurable delays, the problem of damping the solution by using a linear difference-differential controller with a state feed-back is solved. A generalization of these results to linear autonomous difference-differential systems of neutral type with commensurable delays in the case of a continuous solution is proposed. ...2017-11-22 -
Erratum to: Thermo‑optic coefficients of Nd‑doped anisotropic KGd(WO4)2, YVO4 and GdVO4 laser crystals
(2016)Erratum to: Thermo‑optic coefficients of Nd‑doped anisotropic KGd(WO4)2, YVO4 and GdVO4 laser crystals / P. A. Loiko [et al.] // Applied Physics B. – 2016. – Vol. 129.2017-11-22 -
Acoustic Response to the Action of Nanosecond Laser Pulses on an In/CdTe Thin-Film Heterostructure
(2015)The photothermoacoustic method has been used for diagnostics of thermobarodynamic processes in the metal In(400 nm)/semiconductor (CdTe) thin-film system under nanosecond laser irradiation (7 ns, λ = 532 nm) in natural conditions (in air) and in a liquid medium (water). From the analysis of the data obtained, the dependence of the pressure induced in the energy-release region on ...2017-11-22 -
Luminescence of oxyfluoride glasses containing YB3+–RE3+ ions
(2016)The optical absorption and up-conversion luminescence of oxyfluoride glasses in the system SiO2–PbO–PbF2–CdF2 coactivated by Yb3+–RE3+ ions (where RE = Er, Tm, Ho, Dy, Pr, or Tb) are investigated. Excitation with a laser diode in the IR range (960 nm) gives intense green, blue, and red luminescence. The color characteristics of the up-conversion luminescence in the CIE 1931 system ...2017-11-22 -
Laser Performance of Er,Yb:YAl3(BO3)4 Crystals with Different Erbium Concentrations
(2014)The effect of erbium concentration on the laser performance of Er,Yb:YAl3(BO3)4 crystals was investigated. A maximal output power of 1.6 W in CW and 2.7 W in QCW regimes was obtained at 1522 nm.2017-11-22 -
Insensitivity of the Stationary Distribution of State Probabilities in an Open Network with Non-Active Customers
(2015)We study the stationary operation of an open queueing network with non-active customers and informational signals. The amount of work to service a claim is a random value with an arbitrary distribution. The stationary distribution of network state probabilities has a multiplicative form and is insensitive with respect to the functional form of the distribution of the work needed ...2017-11-21 -
Structure and nonlinear optical properties of novel transparent glass-ceramics based on Co2+:ZnO nanocrystals
(2016)Transparent glass-ceramics (GCs) based on Co2+:ZnO nanocrystals (mean diameter, 11 nm) are synthesized on the basis of cobalt-doped glasses of the K2O–ZnO–Al2O3–SiO2 system. For these GCs, the absorption band related to the 4A2(4F) → 4T1(4F) transition of Co2+ ions in tetrahedral sites spans until ~1.73 μm. Saturation of the absorption is demonstrated at 1.54 μm, with a saturation ...2017-11-18 -
Tm:KLu(WO4)2 microchip laser Q-switched by a graphene-based saturable absorber
(2015)We report on the first Tm-doped double tungstate microchip laser Q-switched with graphene using a Tm:KLu(WO4)2 crystal cut along the Ng dielectric axis. This laser generates a maximum average output power of 310 mW with a slope efficiency of 13%. At a repetition rate of 190 kHz the shortest pulses with 285 ns duration and 1.6 μJ energy are achieved.2017-11-18 -
Thermo-optic characterization of Yb:CaGdAlO4 laser crystal
(2014)Principal thermo-optic coefficients (TOCs), dno/dT and dne/dT, are measured for Yb:CaGdAlO4 crystal, for the first time, to our knowledge. At the wavelength of ~1 μm, they equal –7.6 and –8.6 (Ч10-6 K-1), accordingly. Thermal coefficients of the optical path (TCOP) are determined for this crystal for the principal crystal cuts (a-cut and c-cut) and light polarizations (π or σ). ...2017-11-18 -
Spectroscopy of tetragonal Eu:NaGd(WO4)2 crystal
(2016)We report on growth and detailed spectroscopic study of Eu3ю-doped tetragonal sodium gadolinium double tungstate, Eu:NaGd(WO4)2, a new promising crystal for deep-red lasers. Large-volume crystal doped with 4.9 at.% Eu is grown by Czochralski method along the [001] crystallographic direction. Absorption of Eu3ю ions is studied at room temperature (RT) and at 6 K. For the absorption ...2017-11-18