scholarly journals Comparative Estimation of Methods for Realization of Wide Band Communication Network in the Short Wave Range of Radio Waves

2017 ◽  
Vol 20 (3) ◽  
pp. 118
Author(s):  
I Z Klimov
Keyword(s):  
Communication Network ◽  
Wide Band ◽  
Short Wave ◽  
Radio Waves ◽  
Wave Range

Выполнен анализ вариантов построения широкополосных систем связи, отличающихся типами используемых сигналов и способами их обработки. Показано, что требуемый уровень потенциальной помехоустойчивости в многолучевом канале обеспечивает ЧР-ШПЭ. Реальный уровень помехоустойчивости соответствует потенциальному значению только при оптимальном когерентном сложении ветвей разнесения и идеальной синхронизации. На основе использования ШПС-РС с усложненной структурой может быть реализована ШСС с высоким уровнем качества передачи информации и защиты от организованных помех, в которой за счет уменьшения времени передачи радиограммы реализуется передача с частотно-временным разнесением путем повторов передачи на заданных частотах.

MONITORING OF COASTAL ECOSYSTEMS BY METHOD OF REMOTE SENSING IN THE SHORT-WAVE RANGE OF RADIO WAVES

2017 ◽  
Author(s):  
Sergej Belov ◽  
Sergej Belov ◽  
Ija Belova ◽  
Ija Belova ◽  
Stepan Falomeev ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Comparative Analysis ◽  
Short Wave ◽  
Coastal Ecosystems ◽  
Relative Accuracy ◽  
New Method ◽  
Radio Waves ◽  
Signal Noise ◽  
Order Of Magnitude ◽  
Wave Range

A new method for estimating the parameter noncoherent signal/noise K of ionospheric signal is offered. A comparative analysis is carrying out. This new method exceeds an order of magnitude widely used standard one by analytical (relative) accuracy of determining a parameter K. It has the same order as the well-known coherent methodology.

MONITORING OF COASTAL ECOSYSTEMS BY METHOD OF REMOTE SENSING IN THE SHORT-WAVE RANGE OF RADIO WAVES

2017 ◽  
Author(s):  
Sergej Belov ◽  
Sergej Belov ◽  
Ija Belova ◽  
Ija Belova ◽  
Stepan Falomeev ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Comparative Analysis ◽  
Short Wave ◽  
Coastal Ecosystems ◽  
Relative Accuracy ◽  
New Method ◽  
Radio Waves ◽  
Signal Noise ◽  
Order Of Magnitude ◽  
Wave Range

A new method for estimating the parameter noncoherent signal/noise K of ionospheric signal is offered. A comparative analysis is carrying out. This new method exceeds an order of magnitude widely used standard one by analytical (relative) accuracy of determining a parameter K. It has the same order as the well-known coherent methodology.

THE INCREASING OF DATA TRANSFER NOISE IMMUNITY IN DEPARTMENTAL COMMUNICATION SYSTEMS OF SHORT-WAVE RANGE

2018 ◽  
pp. 7-19
Author(s):  
B. G. Shadrin ◽  
◽  
D. E. Zachateyskiy ◽  
V. A. Dvoryanchikov Dvoryanchikov ◽  
◽  
...  
Keyword(s):  
Communication Systems ◽  
Noise Immunity ◽  
Data Transfer ◽  
Short Wave ◽  
Wave Range

CHANGE OF THE FRESH MUSHROOM TEXTURE IN THE PROCESS OF REFRIGERATED STORAGE AFTER PROCESSING WITH UV RADIATION

2020 ◽  
Author(s):  
В.В. Кондратенко ◽  
Н.И. Федянина ◽  
О.В. Карастоянова
Keyword(s):  
Ultraviolet Radiation ◽  
Agaricus Bisporus ◽  
Power Flow ◽  
Storage Capacity ◽  
Dose Range ◽  
Short Wave ◽  
Flow Density ◽  
Fruiting Bodies ◽  
Negative Effect ◽  
Wave Range

Исследовано влияние обработки свежих плодовых тел шампиньонов (Agaricus bisporus) ультрафиолетовым излучением в коротковолновом диапазоне С (100–280 нм) дозами 160, 320, 480, 640, 800 Дж/м2 при плотности потока мощности 2,7 · 103Дж/с · м2 на изменение качественного показателя хранимоспособности – текстуры грибов в процессе холодильного хранения. Хранение упаковок с грибами осуществляли в холодильной камере при t 4–5°С и относительной влажности воздуха 85–90%. Контроль изменения показателя хранимоспособности проводили по истечении 1, 3, 8, 13, 16, 21, 24 и 27-ми сут. В процессе хранения исследовали динамику изменения текстуры грибов, кг/см2. Установлено, что обработка в диапазоне доз до 418 Дж/м2 приводит к негативному эффекту изменения хранимоспособности и является нецелесообразной. Определено, что обработка УФ излучением в диапазоне доз 418–800 Дж/м2 приводит к увеличению хранимоспособности и достигает своего экстремума при 685 Дж/м2. При экстраполяции результатов экспериментальных данных такая тенденция отмечается, предположительно, до дозы 876 Дж/м2. Получены динамики текстуры в процессе хранения после обработки УФ излучением. Разработано математическое описание зависимости предельной хранимоспособности по показателю текстуры грибов от дозы облучения. The effect of irradiation of fresh the fruiting bodies of champignons (Agaricus bisporus) with ultraviolet radiation in the short – wave range C (100–280 nm) doses of 160, 320, 480, 640, 800 J/m2at a power flow density of 2,7 · 103 J/s · m2 on the change in the quality indicator of ability to store – the texture of mushrooms during cold storage was studied. Packages with mushrooms were stored in a refrigerator at t 4–5°C and relative humidity 85–90%. Monitoring of changes of ability to store was carried after 1, 3, 8, 13, 16, 21, 24 and 27 days. During storage, studied the dynamics of changes in the texture of mushrooms, kg/cm2. It was found that irradiation in the dose range up to 418 J/m2 leads to a negative effect of changes of ability to store and is impractical. It was determined that ultraviolet radiation in the dose range of 418– 800 J/m2leads to an increase of ability to store and reaches extreme at 685 J/m2. When extrapolating the results of experimental data, such a tendency is presumably observed up to a dose of 876 J/m2. The dynamics of the texture obtained during storage after processing with ultraviolet radiation. A mathematical description of the dependence of the maximum storage capacity in terms of the texture of mushrooms on the radiation dose is developed.

The Results of Astroclimate Observations in the Short-Wave Length Interval of the Millimeter-Wave Range on the Suffa Plateau

2017 ◽  
Vol 59 (8-9) ◽  
pp. 763-771 ◽  
Author(s):  
G. M. Bubnov ◽  
Yu. N. Artemenko ◽  
V. F. Vdovin ◽  
D. B. Danilevsky ◽  
I. I. Zinchenko ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Wave Length ◽  
Short Wave ◽  
Short Wave Length ◽  
Millimeter Wave Range ◽  
Wave Range

The investigation of the Universe by radio astronomy

1961 ◽  
Vol 16 (1) ◽  
pp. 65-68
Keyword(s):  
Wavelength Range ◽  
Radio Astronomy ◽  
Outer Space ◽  
Sunspot Cycle ◽  
Short Wave ◽  
Radio Waves ◽  
Residual Noise ◽  
The Earth ◽  
Long Wave ◽  
The Universe

Although nearly all the major advances in radio astronomy have taken place during the last fifteen years the basic discoveries were made 30 years ago. At that time Jansky realized that the residual noise in his receiving equipment had a daily sidereal variation and must be the result of radio waves reaching the earth from outer space, and Appleton in the U. K. with Breit and Tuve in America through their studies of the ionosphere laid the foundation of the radio echo techniques of radio astronomy. The radio emission from outer space can be received on earth in the wavelength range from a few millimetres to 10 or 20 metres. The short wave end is limited by absorption in the atmosphere and the long wave end by the ionosphere, and this upper limit tends to vary in sympathy with ionospheric conditions throughout the sunspot cycle. These hindrances will soon be overcome when suitable equipment can be carried in earth satellites; then it should be possible to determine the true wavelength range of these extraterrestrial emissions.

scholarly journals THE SOURCES OF RADIATION IN THE SHORT-WAVE RANGE ON THE BASIS OF II-VI HETEROLAYERS

2018 ◽  
Vol 8 (4) ◽  
pp. 4-7
Author(s):  
Mikhail Slyotov ◽  
Alexey Slyotov
Keyword(s):  
Zinc Selenide ◽  
Temperature Stability ◽  
Short Wave ◽  
High Temperature Stability ◽  
Substitution Method ◽  
Isovalent Substitution ◽  
Quantum Radiation ◽  
Donor Acceptor ◽  
Wave Range ◽  
Hexagonal Modification

The possibility of obtaining zinc selenide and zinc sulfide layers of hexagonal modification by isovalent substitution method is shown. They are characterized by intensive luminescence which is formed by the dominant annihilation of bound excitons for α-ZnSe and recombination on donor-acceptor pairs for α-ZnS. The resulting radiation covers the violet wavelength range. Quantum radiation efficiency reaches η = 10–12% for α-ZnSe and η = 5–8% for α-ZnS. The radiation is characterized by high temperature stability and repeatability of characteristics and parameters.

scholarly journals Autonomous node in the short wave radio network

2019 ◽  
Vol 29 (3) ◽  
pp. 26-32
Author(s):  
D. A. Kiba ◽  
A. S. Gudim ◽  
N. N. Liubushkina ◽  
S. G. Marushchenko
Keyword(s):  
Short Wave ◽  
Radio Networks ◽  
Network Node ◽  
Radio Network ◽  
Radio Waves ◽  
Monitoring And Control ◽  
Photovoltaic Panel ◽  
Wave Radio ◽  
Study Results ◽  
Autonomous Nodes

The paper covers questions related to the creation of the comprehensive device designed for long-term autonomous operations as part of the radio networks for various purposes in short-wave bands. Such radio networks are intended for remote monitoring and control over facilities at distances of hundreds and thousands of kilometres. The device and features of functioning of autonomous nodes in short-wave radio networks are based on daily and seasonal characteristics of distribution of radio waves, operation under conditions of self-provision with electricity and in areas of harsh climate, as well as on impossibility of their timely repair and maintenance. The authors have proposed solutions to the issue of a reliable communication channel using advanced low-energy types of angle modulation with low-value signal-to-noise ratios and the choice of the best frequency for a given time of the day for specific nodes. There is an overview of issues related to the choice of an antenna type for the autonomous radio network node, taking into account changes of working ranges. The issue of power supply to the radio network node is solved by applying the combination of a photovoltaic panel and wind generator working from a frost-resistant battery. Thermal modes for electronic equipment are provided through the use of a thermostatically controlled container. Authors have presented a possible architecture for the short-wave range radio network node. The study results include advice for developers of autonomous nodes of shortwave radio networks.

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