Method for Determining the Limiting Length of the Long Ethernet Twisted Pair Cable Channel

2021 ◽  
Author(s):  
A. B. Semenov
Keyword(s):  
Twisted Pair ◽  
Cable Channel

Design of hybrid cable remote power supply circuits with a coaxial element for collecting and processing information based on video surveillance systems

2021 ◽  
pp. 102-117
Author(s):  
А.Б. Семенов ◽  
К.Д. Буробина ◽  
С.А. Орлова
Keyword(s):  
Video Surveillance ◽  
Supply Voltage ◽  
Computer Control ◽  
Channel Length ◽  
Coaxial Cable ◽  
Surveillance Systems ◽  
Cross Sectional ◽  
Twisted Pair ◽  
Cable Channel ◽  
Processing Information

Обоснована перспективность применения компьютерных систем управления с централизованной структурой. На примере системы видеонаблюдения показаны возможности коаксиальных, витопарных и волоконно-оптических кабелей при построении физического уровня подобных систем. Определено место коаксиального кабеля при реализации таких структур. Рассмотрены возможности комбинированных конструкций из коаксиальной трубки и дополнительных жил питания при подключении удаленной терминального сетевого компьютерного оборудования с коаксиальным интерфейсом. Предложен метод расчета площади поперечного сечения выделенных жил питания для такого кабеля, определены их конкретные значения в зависимости от требуемого расстояния и мощности потребления терминального оборудования. Продемонстрирована целесообразность применения повышенного напряжения питания для систем уличного исполнения при протяженности тракта свыше 300 м. The prospects of using computer control systems with a centralized structure are substantiated. The possibilities of coaxial, twisted-pair and fiber-optic cables for building the physical level of modern video surveillance systems are shown. The place of the coaxial cable in the implementation of such systems is determined. The possibilities of combined structures made of a coaxial tube and additional power wires when connecting a remote TV camera are considered. A method is proposed for calculating the cross-sectional area of the separated power wires for such a cable, and their specific values are determined depending on the required distance and power consumption of the TV camera. The expediency of using increased supply voltage for street systems with a cable channel length of more than 300 m is demonstrated.

scholarly journals Calculating millimeter-wave modes of copper twisted-pair cables using transformation optics

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Ali Mohajer Hejazi ◽  
Gert-Jan Stockman ◽  
Yannick Lefevre ◽  
Vincent Ginis ◽  
Werner Coomans
Keyword(s):  
Millimeter Wave ◽  
Transformation Optics ◽  
Twisted Pair ◽  
Wave Modes

A Novel Method for Predicting Crosstalk in Lossy Twisted Pair Cable Based on Beetle Antennae Search and Implicit Wendroff FDTD Algorithm

2021 ◽  
Vol 41 (3) ◽  
pp. 208-221
Author(s):  
Jianming Zhou ◽  
Shijin Li ◽  
Wei Yan ◽  
Yanxing Ji ◽  
Zhaojuan Meng ◽  
...  
Keyword(s):  
Twisted Pair ◽  
Novel Method

scholarly journals The effect of dipole housing and feeding wires in physical phantoms for EEG

2019 ◽  
Vol 5 (1) ◽  
pp. 85-88
Author(s):  
René Machts ◽  
Alexander Hunold ◽  
Jens Haueisen
Keyword(s):  
Electric Potential ◽  
Volume Conductor ◽  
Constant Current ◽  
Twisted Pair ◽  
Eeg Data ◽  
Phantom Measurements ◽  
Average Change ◽  
Electric Potentials ◽  
The Difference ◽  
Signal Sources

AbstractCurrent dipoles are well established models in the localization of neuronal activity to electroencephalography (EEG) data. In physical phantoms, current dipoles can be used as signal sources. Current dipoles are often powered by constant current sources connected via twisted pair wires mostly consisting of copper. The poles are typically formed by platinum wires. These wires as well as the dipole housing might disturb the electric potential distributions in physical phantom measurements. We aimed to quantify this distortion by comparing simulation setups with and without the wires and the housing. The electric potential distributions were simulated using finite element method (FEM). We chose a homogenous volume conductor surrounding the dipoles, which was 100 times larger than the size of the dipoles. We calculated the difference of the electric potential at the surface of the volume conductor between the simulations with and without the connecting wires and the housing. Comparing simulations neglecting all connecting wires and the housing rod to simulations considering them, the electric potential at the surface of the volume conductor differed on average by 2.85 %. Both platinum and twisted pair copper wires had a smaller effect on the electric potentials with a maximum average change of 6.38 ppm. Consequently, source localization of measurements in physical head phantoms should consider these rods in the forward model.

Study on the Truss Support Technology for Coal Side in a Soft Broken Coal Roadway Under High Stress

2012 ◽  
Vol 524-527 ◽  
pp. 360-363
Author(s):  
Shou Yi Dong ◽  
Qi Tao Duan ◽  
Fu Lian He ◽  
Qi Li ◽  
Hong Jun Jiang
Keyword(s):  
Production Condition ◽  
High Stress ◽  
Field Investigation ◽  
Surrounding Rock ◽  
Theory Analysis ◽  
Large Section ◽  
Cable Channel ◽  
Coal Roadway ◽  
Measurement Results ◽  
Steel Truss

The coal side deformation and sliding can not be effectively controlled by use of the traditional bolt or cable support in the high stress crushed surrounding rock and large section roadway. For solving this problem, the new prestressed truss support technology is put forward, and its supporting principles of roof and two walls are stated. The mechanical model of cable-channel steel truss is established, and then the tensile strength of the cable and the maximum deflection of the channel steel are derived. By way of field investigation, mechanics theory analysis and actual production condition, the scheme is defined and applied in the replacement roadway. Measurement results of surrounding rock behavior show that the coal side displacement is no more than 254mm and the roof convergence is less than 172mm. Apparent economic and technical profits have been achieved.

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