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

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 Design and Fabrication of Magnetic Loop Antenna for 5MHz

2021 ◽  
Vol 10 (4) ◽  
pp. 29-32
Author(s):  
Anvesh Inamdar ◽  
G.S. Mundada
Keyword(s):  
Quality Factor ◽  
High Efficiency ◽  
Signal To Noise Ratio ◽  
Magnetic Loop ◽  
Short Wave ◽  
Loop Antenna ◽  
Tank Circuit ◽  
Copper Pipe ◽  
Tuning Capacitor ◽  
Wave Range

In the short-wave range, size of the antenna become large and therefore is a major constraint. Magnetic Loop Antenna provides an advantage over other antennas in terms of a smaller size, higher quality factor and better signal to noise ratio. It works on the principle of resonance with the inductor provided by loop and external tuning capacitor operating like a tank circuit. The tunable magnetic loop antenna is designed to work in the high frequency range. The antenna consists of a circular hollow copper pipe, an inductive loop feed and a variable tuning capacitor. The antenna is tuned using variable 9-140pF capacitor paralleled with 150pF capacitor. The designed antenna is simulated using 4NEC2 software. The simulated antenna has high efficiency and quality factor of more than 1000. The real time testing show great result at 5.45MHz with bandwidth of 8KHz.

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.

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.

scholarly journals Method for automatic antenna matching with transmitter output stage

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (3) ◽  
pp. 31-39
Author(s):  
D. A. Kovalevich
Keyword(s):  
Calculation Method ◽  
Short Wave ◽  
The Body ◽  
Automatic Tuning ◽  
Output Stage ◽  
Advantages And Disadvantages ◽  
Parasitic Parameters ◽  
Wave Range ◽  
Automatic Matching

This work is devoted to the study of automatic antenna tuning units of the short-wave range. Devices of narrowband matching based on discrete sets of reactive elements are considered. A classification of the most frequently used automatic matching methods has been made. The advantages and disadvantages of each method are analyzed. Examples of using different approaches in commercially available devices are given. Particular attention  is  paid  to  the  calculation  method  of  matching,  as  the most  promising  for  use  in  modern communications. Assumptions are made about the reasons for its rare use in serial devices. Circuits have been developed to simulate the influence of parasitic parameters of the components of the matching circuit and the body of the tuning unit on the resulting standing wave ratio when using this method. Based on the simulation results,  conclusions  were  drawn  about  the  reasons  for  the  low  quality  of  the  calculation  method.  As  an alternative, a new method of automatic tuning is proposed, combining the advantages of computation and search methods,  which  is  based  on  modeling  the  search  process  using  a simulation  model.  The  conditions  for  its application in automatic antenna tuning units are determined. Acomparative analysis of the features of both the known methods of automatic tuning and the newly proposed one ismade.

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.

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