Fullerene in a magnetic field

The manuscript presents a trajectory method for describing the rotations of surface crystals such as fullerenes, nanotubes, and nanotori. This method does not require the implementation of successive rotations of the considered molecular structures around the axes of the selected basis. Therefore, it is free from the shortcomings of the approaches of Euler and Hamilton. On its basis, an efficient algorithm for calculating the motions of a magneto-susceptible fullerene in an alternating magnetic field has been developed. The nature of rotation of fullerenes in fields of various configurations has been studied

Twisted Nanotubes of Transition Metal Dichalcogenides with Split Optical Modes for Tunable Radiated Light Resonators

Synthesized micro- and nanotubes composed of transition metal dichalcogenides (TMDCs) such as MoS$_2$ are promising for many applications in nanophotonics, because they combine the abilities to emit strong exciton luminescence and to act as whispering gallery microcavities even at room temperature. In addition to tubes in the form of hollow cylinders, there is an insufficiently-studied class of twisted tubes, the flattened cross section of which rotates along the tube axis. As shown by theoretical analysis, in such nanotubes the interaction of electromagnetic waves excited at opposite sides of the cross section can cause splitting of the whispering gallery modes. By studying micro-photoluminescence spectra measured along individual MoS$_2$ tubes, it has been established that the splitting value, which controls the energies of the split modes, depends exponentially on the aspect ratio of the cross section, which varies in "breathing" tubes, while the relative intensity of the modes in a pair is determined by the angle of rotation of the cross section. These results open up the possibility of creating multifunctional tubular TMDC nanodevices that provide resonant amplification of self-emitting light at adjustable frequencies

Qualimetrical Models of Integrated Assessment of Safety of Functioning of Military and Technical Systems

В статье рассматриваются методологические вопросы построения квалиметрических моделей интегральной оценки безопасности функционирования военно-технических систем в рамках аксиоматического (нормативного) подхода к многокритериальным задачам принятия управленческих решенийIn work methodological issues of creation of qualimetrical models of integrated assessment of safety of functioning of military and technical systems within axiomatic (standard) approach to multicriteria tasks of acceptance of management decisions are considere

Numerical Modelling of the Intense Deformed Condition of the Multilayered Airfield Covering

В статье представлена модель деформирования слоистой конструкции аэродромного покрытия под воздействием нестационарного температурного поля. Установлена закономерность развития деформации слоя усиления аэродромного покрытия, свободного от внешнего механического воздействия, при нестационарном градиенте температуры с учетом термоупругих характеристик материала конструкции. Смоделирован процесс изменения напряженно-деформированного состояния (ДНС) слоистой конструкции во времени и по глубине и оценено влияние толщины асфальтобетонного слоя на динамику развития напряжений и деформаций в указанном слое. Приведен анализ результатов численного моделирования для заданных условий, которые могут быть использованы для проектирования асфальтобетонных конструкций усиления сборных аэродромных покрытий при реконструкции ВППThe lack of a rigorous mathematical model of the performance of asphalt layers increase complicates the adoption of technological solutions in the design of structures strengthening of pre-cast airfield pavements. To determine the dynamics of changes in stress-strain state of multilayer airfield pavements it is necessary to conduct numerical simulation of temperature effects on him, generalization of the results of which will determine the optimal characteristics of the coating during reconstruction and to take measures to slow down reflective cracking in asphalt layers build. As a result of the obtained regularity of the deformation reinforcement airfield pavements under the influence of non-stationary temperature field free from external mechanical impact, given the thermoelastic properties of the material of the structure; dynamics of changes of the stress state of structures in time and in depth and evaluated the influence of the thickness of the asphalt layer on the voltage. The data obtained in the settlement process, can be used to design asphalt concrete lay-ers increasing in the reconstruction of runways, prefabricated airfield pavement

The Modified Method of Direct Search in Optimising Tasks of Special Structure

В статье рассмотрен подход к решению оптимизационных задач специальной структуры: условной оптимизации вещественной нелинейной целевой функции n-мерного аргумента с неявно заданными нелинейными ограничениями. Представленный методический подход на основе модифицированного метода Хука-Дживса позволит определить оптимальные наборы значений характеристик систем военного назначения, функционирующих в различных условиях обстановки, по критерию минимальной стоимости при ограничении на требуемый уровень эффективности за располагаемое времяIn article approach to the solution of optimizing tasks of special structure is considered: conditional optimization of material nonlinear criterion function of n – measured argument with implicitly set nonlinear restrictions. The presented methodical approach, on the basis of the modified Hook-Dzhivsa’s method, will allow to determine optimum sets of values of characteristics of the military systems functioning in various conditions of a situation by criterion of the minimum cost at restriction on the demanded efficiency level for the located tim

Qualimetrical Models of Integrated Assessment of Safety of Functioning of Military and Technical Systems

В статье рассматриваются методологические вопросы построения квалиметрических моделей интегральной оценки безопасности функционирования военно-технических систем в рамках аксиоматического (нормативного) подхода к многокритериальным задачам принятия управленческих решенийIn work methodological issues of creation of qualimetrical models of integrated assessment of safety of functioning of military and technical systems within axiomatic (standard) approach to multicriteria tasks of acceptance of management decisions are considere

Numerical Study of the Passage of Natural Gas Components through C₆₀ Fullerite in the Low-Temperature Phase

The movement of natural gas components through a crystalline fragment of C60 fullerite in a simple cubic phase is numerically investigated. The methods of classical molecular physics, the Monte Carlo and Euler approaches, and a step-by-step numerical method of a high order of accuracy are used to study the effects arising from the passage of the particles through the C60 fullerite. The influence of the characteristics of incoming particles on the permeability of fullerite was analyzed using the results of the performed calculations. The application of the fast integral approach based on the smoothed spherical potential is discussed and compared with the Monte Carlo method

Adaptive Method of Consecutive Concessions at the Solution to the Problem of Vector Optimization of Characteristics of System of Engineering – Air Field Maintenance of Operations of Aircraft of the Air Forces

В статье представлен один из адаптивных методов агрегирования подсистем в единую систему инженерно-аэродромного обеспечения боевых действий авиации ВВС, позволяющий упростить требуемую от лица принимающего решение информацию при поиске наиболее предпочтительной альтернативы из областей подлежащих рассмотрению оптимальных по Парето альтернатив, при решении задачи многокритериальной оптимизации характеристик системы инженерно-аэродромного обеспечения боевых действий авиации на постоянных аэродромах ВВСIn article one of adaptive methods of aggregation of subsystems is presented to uniform system of engineering-air field maintenance of operations of aircraft of the Air Forces, allowing to simplify required on behalf of making a decision the information, by search of the most preferential alternative from areas a subject consideration optimum on Pareto alternatives, at the solution to the problem It is a lot of criteria optimization of characteristics of system of engineering-air field maintenance of operations of aircraft in constant air stations of the Air Force

The Modified Method of Direct Search in Optimising Tasks of Special Structure

В статье рассмотрен подход к решению оптимизационных задач специальной структуры: условной оптимизации вещественной нелинейной целевой функции n-мерного аргумента с неявно заданными нелинейными ограничениями. Представленный методический подход на основе модифицированного метода Хука-Дживса позволит определить оптимальные наборы значений характеристик систем военного назначения, функционирующих в различных условиях обстановки, по критерию минимальной стоимости при ограничении на требуемый уровень эффективности за располагаемое времяIn article approach to the solution of optimizing tasks of special structure is considered: conditional optimization of material nonlinear criterion function of n – measured argument with implicitly set nonlinear restrictions. The presented methodical approach, on the basis of the modified Hook-Dzhivsa’s method, will allow to determine optimum sets of values of characteristics of the military systems functioning in various conditions of a situation by criterion of the minimum cost at restriction on the demanded efficiency level for the located tim