МОДЕЛИРОВАНИЕ СИСТЕМЫ РАДИОМОНИТОРИНГА СИГНАЛОВ АДАПТИВНЫХ СИСТЕМ РАДИОСВЯЗИ КОРОТКОВОЛНОВОГО ДИАПАЗОНА

The structure of model which allows to spend an estimation of system functioning efficiency of radio monitoring system of short­wave radio communication adaptive systems in adverse conditions of influence of external jams is described.Описана структура модели, позволяющей провести оценку эффективности функционирования системы радиомониторинга сигналов адаптивных систем радиосвязи коротковолнового диапазона в неблагоприятных условиях воздействия внешних помех

Структура математической модели многопозиционной системы радиомониторинга сигналов коротковолнового диапазона

The structure of model which allows to spend an estimation of system functioning efficiency of radio monitoring system of short-wave radio communication adaptive systems in adverse conditions of influence of external jams is described.Рассмотрена математическая модель многопозиционной системы радиомониторинга коротковолнового диапазона, позволяющая провести оценку эффективности функционирования многопозиционной системы радиомониторинга сигналов коротковолнового диапазона в неблагоприятных условиях воздействия внешних помех

MODELLING OF RADIO MONITORING SYSTEM OF SHORT-WAVE RADIO COMMUNICATION ADAPTIVE SYSTEMS

The structure of model which allows to spend an estimation of system functioning efficiency of radio monitoring system of short­wave radio communication adaptive systems in adverse conditions of influence of external jams is described

Modelling of radio monitoring system of short-wave radio communication adaptive systems

The structure of model which allows to spend an estimation of system functioning efficiency of radio monitoring system of short-wave radio communication adaptive systems in adverse conditions of influence of external jams is described

Лабораторні експериментальні дослідження багатофазних сепараторів

In this paper we have characterized the vortex type separator for the four-phase mixture separation in traditional system of separation and redesign or improvement of the vortex type horizontal separator with gravity filter for minimizing the dimension and mass of the separator. There are also presented the experimental studies made on the basis of this equipment.Описано новий тип вихрового сепаратора для чотирифазної суміші. Наведено результати експериментальних досліджень

Mathematical model of gas-liquid-sand mixture separation in the four-phase separator of inertial type for subsea application

In this article the construction and mathematical model of four-phase separator is realized, which is based on inertial separation mechanism of gas-liquid-sand mixture. Also we have put the problem on the basis of this model to obtain the dependence of separator efficiency on the parameters which play a crucial role in the technological process of separating gas-oil-water-sand mixture into a solid, liquid and a gas phase

Negative magnetoresistance in indium antimonide whiskers doped with tin

Negative magnetoresistance of InSb whiskers with different impurity concentrations 4.4 × 10 ¹⁶–7.16 × 10 ¹⁷ cm −³ was studied in longitudinal magnetic field 0–14 T in the temperature range 4.2–77 K. The negative magnetoresistance reaches about 50% for InSb whiskers with impurity concentration in the vicinity to the metal–insulator transition. The negative magnetoresistance decreases to 35 and 25% for crystals with Sn concentration from the metal and dielectric side of the transition. The longitudinal magnetoresistance twice crosses the axis of the magnetic field induction for the lightly doped crystals. The behavior of the negative magnetoresistance could be explained by the existence of classical size effect, in particular boundary scattering in the subsurface whisker layer

Low-temperature magnetoresistance of GaSb whiskers

Transverse and longitudinal magnetoresistancies in n-type GaSb whiskers with different doping concentration (Te) in the vicinity to the metal-insulator transition (MIT) from metal side of the transition were studied in the temperature range 1.5–60 K and magnetic field 0–14 T. Shubnikov-de Haas oscillations in GaSb whiskers at low temperatures were revealed in magnetic field range 2–12 T. The oscillation period 0.025 T⁻¹ was found at various doping concentration in GaSb whiskers. The effective mass of electrons m c = 0.041 m ₀ and Dingle temperature of about 7.5 K were found in GaSb whiskers with impurity concentration in the vicinity to MIT. The presence of negative magnetoresistance in GaSb whiskers with the impurity concentration in the nearest approximation to MIT with resistivity ρ ₃₀₀ K = 0.0053 Ω cm was observed and associated with weak localization. Besides for the whiskers a resistance minimum was observed at temperature about 16 K that is connected with Kondo effect. Magnetoresistance studies of n-type conductivity for GaSb whiskers revealed the crossover from weak localization to antilocalization in the temperature range of 1.4–4.2 K and magnetic fields below 1 T