17 research outputs found
Continuity theorems for the queueing system
In this paper continuity theorems are established for the number of losses
during a busy period of the queue. We consider an queueing
system where the service time probability distribution, slightly different in a
certain sense from the exponential distribution, is approximated by that
exponential distribution. Continuity theorems are obtained in the form of one
or two-sided stochastic inequalities. The paper shows how the bounds of these
inequalities are changed if further assumptions, associated with specific
properties of the service time distribution (precisely described in the paper),
are made. Specifically, some parametric families of service time distributions
are discussed, and the paper establishes uniform estimates (given for all
possible values of the parameter) and local estimates (where the parameter is
fixed and takes only the given value). The analysis of the paper is based on
the level crossing approach and some characterization properties of the
exponential distribution.Comment: Final revision; will be published as i
Особенности расчета освещенности, эквивалентной шуму, для тепловизионных и телевизионных систем
Запропоновано узагальнена методика розрахунку освітленості, що еквівалентна шуму, для тепловізійних і телевізійних систем, яка враховує спектральні характеристики випромінювання об’єкта й фону, пропускання атмосфери та об’єктива, чутливості приймача випромінювання.A generalized technique is proposed for calculating the noise-equivalent irradiance for thermovision and television systems. It takes into account spectral characteristics of a target, background radiation, atmospheric and a objective lens’ transmittance, as well as a detector’s sensitivity.Предложена обобщенная методика расчета освещенности, эквивалентной шуму, для тепловизионных и телевизионных систем, которая учитывает спектральные характеристики излучения объекта и фона, пропускание атмосферы и объектива, чувствительности приемника излучения
Nonlinear rotation of the polarization of the intense femtosecond laser radiation in BaF2
Efficient generation of coherent THz phonons with a strong change in frequency excited by femtosecond laser plasma formed in a bulk of quartz
Observation of thermonuclear neutrons emitted from dense femtosecond plasma at moderate intensities
Influence of processing conditions on the structure and properties of yttrium oxide ceramics
By means of "wet" chemistry method Y₂O₃ nanopowder was obtained and characterized by X-ray diffraction analysis and differential thermal analysis. Transparent samples of Y₂O₃ and Y₂O₃:Nd ceramics were produced by vacuum sintering. Granulometric and phase compositions, crystal structure, spectral-kinetic and mechanical properties of the ceramics were studied