Study on transmission attenuation of 10.6μm laser in different weather

2019 ◽  
Author(s):  
Xuan He ◽  
Bing Zhou ◽  
HeXiong Kiu ◽  
Yang Yan ◽  
Yan Zhang
Keyword(s):  
Transmission Attenuation

scholarly journals Transmission Attenuation of 110kv Asymmetric Transmission Lines Based on Measured Data

2019 ◽  
Vol 486 ◽  
pp. 012125
Author(s):  
Songling Pang ◽  
Fali Tan ◽  
Hailong Zhao ◽  
Meng Zhang ◽  
Jian Liao ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Measured Data ◽  
Asymmetric Transmission ◽  
Transmission Attenuation

Research on a simulating device for electric transmission characteristics of long-distance subsea umbilical cable

2020 ◽  
pp. 147509022092450
Author(s):  
Yufang Li ◽  
Honglin Zhao ◽  
Yongbiao Xu ◽  
Deguo Wang
Keyword(s):  
Voltage Drop ◽  
Low Cost ◽  
Signal Transmission ◽  
Transmission Characteristics ◽  
Electrical Transmission ◽  
Long Distance ◽  
The Real ◽  
Transmission Attenuation ◽  
Umbilical Cable ◽  
Attenuation Characteristics

Subsea umbilical cable is an important link to transmit power and signals in subsea production system, often lasts for tens of kilometers in deep-sea projects. It is expensive, bulky, and inconvenient to transport. In this article, a compact, low-cost umbilical cable electrical simulator is proposed, which can be equivalent to the real umbilical cable in power transmission characteristics and can adjust parameters in a certain range. By studying the electrical transmission characteristics of long umbilical cable, the calculation method of electrical transmission characteristics is determined. A simulation device for simulating the transmission characteristics of umbilical cable is designed, which can be used to simulate the umbilical cable diameter of 10 and 16 mm2. The voltage drop characteristics, signal transmission attenuation characteristics, and power carrier characteristics of the umbilical cable electrical simulation device are simulated and experimentally analyzed. The experimental results show that the voltage drop characteristics, signal transmission attenuation characteristics, and power carrier characteristics of the umbilical cable electrical simulator are in good agreement with the real umbilical cable. The simulation device of umbilical cable can well simulate the power and signal transmission characteristics of real umbilical cable.

scholarly journals Post-injection transmission attenuation measurements for PET

1988 ◽  
Vol 35 (1) ◽  
pp. 757-761 ◽  
Author(s):  
M. Daube-Witherspoon ◽  
R.E. Carson ◽  
M.V. Green
Keyword(s):  
Post Injection ◽  
Transmission Attenuation

scholarly journals Extraction of 10–30-Day Stable Components from a Boreal Atmosphere during ENSO Phases

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Kuo Wang ◽  
Guolin Feng ◽  
Yuxing Zeng ◽  
Zhengquan Li
Keyword(s):  
Time Scale ◽  
Historical Data ◽  
Science Research ◽  
Atmospheric Science ◽  
New Method ◽  
Transmission Attenuation ◽  
Atmospheric Motion ◽  
Explained Variance ◽  
Enso Phases ◽  
Actual Atmosphere

Distinguishing the predictable 10–30-day stable components (STs) in the actual atmosphere has been important in atmospheric science research. In this study, a new method for extracting 10–30-day STs was developed with the use of historical observations. We extracted and analyzed 10–30-day STs via statistical extrapolation tests. The results show that the STs are maintained uniformly at the intraseasonal time scale; the overall trends in the atmospheric motion are revealed. Comparisons between pentad-by-pentad changes in the explained variances of the 10–30-day STs under ENSO phases show that the explained variance transmission attenuation trends for El Niño and La Niña years are weaker and more continuous than those of neutral years. Data for 10–30-day STs can remain continuous and stable from one month to the next. The proposed method and results present a new means of extracting predictable STs from the atmosphere using historical data.

P15 CT-derived and 153Gd-transmission attenuation correction in myocardial perfusion SPECT

2007 ◽  
Vol 28 (3) ◽  
pp. A22-A23
Author(s):  
L. Livieratos ◽  
K.L. Adamson ◽  
R. Fernandez ◽  
M. Geraghty ◽  
S. Allen
Keyword(s):  
Myocardial Perfusion ◽  
Attenuation Correction ◽  
Myocardial Perfusion Spect ◽  
Perfusion Spect ◽  
Transmission Attenuation

CNTs/Si3N4 Composites Fabricated by Reaction Bonded Processing

2007 ◽  
Vol 336-338 ◽  
pp. 1277-1279
Author(s):  
Zhi Yong Huang ◽  
Xue Jian Liu ◽  
Xing Wei Sun ◽  
Li Ping Huang
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Xrd Analysis ◽  
Matrix Composites ◽  
Si3n4 Ceramic ◽  
Average Value ◽  
Microwave Attenuation ◽  
X Band ◽  
Sem Micrograph ◽  
Transmission Attenuation

The CNTs/Si3N4 ceramic matrix composites were prepared by the reaction bonded processing. The phase compositions, chemical compatibility, mechanical properties, and microwave attenuation properties of the composites were investigated. XRD analysis shows the composites consist mainly of the α- and β-Si3N4, with a trace of unreacted silicon. The SEM micrograph displays the fractured surface of the composites studs with intact CNTs, indicating that CNTs and Si3N4 are chemically compatible. The composites with 1.0wt.% CNTs have a strength of 280 MPa, hardness of 8.2 GPa and toughness of 2.3 MPa·m0.5. The average value of the transmission attenuation reaches 6 dB at X band, indicating the composites have a potential for application in electromagnetic adsorbing or shielding.

Tissue characterization with ballistic photons: counting scattering and/or absorption centres

2015 ◽  
Vol 23 (1) ◽  
Author(s):  
F. Corral ◽  
M. Strojnik ◽  
G. Paez
Keyword(s):  
Piezoelectric Actuator ◽  
Tissue Characterization ◽  
Total Concentration ◽  
Phase Delay ◽  
New Method ◽  
Experimental Setup ◽  
Transmission Attenuation ◽  
Pass Through ◽  
Integrated Or ◽  
Ballistic Photons

AbstractWe describe a new method to separate ballistic from the scattered photons for optical tissue characterization. It is based on the hypothesis that the scattered photons acquire a phase delay. The photons passing through the sample without scattering or absorption preserve their coherence so they may participate in interference. We implement a Mach−Zehnder experimental setup where the ballistic photons pass through the sample with the delay caused uniquely by the sample indices of refraction. We incorporate a movable mirror on the piezoelectric actuator in the sample arm to detect the amplitude of the modulation term. We present the theory that predicts the path−integrated (or total) concentration of the scattering and absorption centres. The proposed technique may characterize samples with transmission attenuation of ballistic photons by a factor of 10

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