Information entropy characteristic of the light scattering signal amplitude distribution of aerosols

2007 ◽  
Author(s):  
Fang Gu ◽  
Juan Yang ◽  
Baomin Bian ◽  
Anzhi He
Keyword(s):  
Light Scattering ◽  
Information Entropy ◽  
Signal Amplitude ◽  
Amplitude Distribution ◽  
Scattering Signal ◽  
Entropy Characteristic

Correlation between light scattering signal and tissue reversibility in rat brain exposed to hypoxia

2010 ◽  
Author(s):  
Satoko Kawauchi ◽  
Shunichi Sato ◽  
Yoichi Uozumi ◽  
Hiroshi Nawashiro ◽  
Miya Ishihara ◽  
...  
Keyword(s):  
Light Scattering ◽  
Rat Brain ◽  
Scattering Signal

scholarly journals Shaping Code in Conjunction with DCT for PAPR Reduction in Multicarrier System

2021 ◽  
Author(s):  
Younes Aimer ◽  
Boubakar Seddik Bouazza ◽  
Smail Bachir ◽  
Claude Duvanaud
Keyword(s):  
Power Amplifier ◽  
Power Efficiency ◽  
Average Power ◽  
Nonlinear Behavior ◽  
Signal Amplitude ◽  
Amplitude Distribution ◽  
Papr Reduction ◽  
Radio Link ◽  
Error Vector Magnitude ◽  
Multicarrier System

Abstract Nonlinear behavior and power efficiency of the Power Amplifier (PA) contradictorily depend on the input signal amplitude distribution. The transmitted signal in multi-carrier modulation exhibits high Peak-to-Average Power Ratio (PAPR) and large bandwidths, leading to the degradation of the radio link and additional generation out-of-band interferences, which degrade the quality of the transmission. Practical solutions exist, like a power back-off, but with unacceptable efficiency performances of the transmitter. This paper deals with efficiency and linearity improvement using a new PAPR reduction method based on the combination of Discrete Cosine Transform (DCT) and shaping technique. The main principle is to determine an optimal coding scheme according to a trade-off between coding complexity and performance benefits in the presence of PA non-linearities. Simulation and experimental results in the context of OFDM signal and using a 20W - 3.7GHz Radio-Frequency Power Amplifier (RF-PA) show an improvement on PAPR reduction of about 3.25dB. Also, the communication criteria like BER (Bit Error Rate) and EVM (Error Vector Magnitude) are improved by about one decade and a half and 8%, respectively.

scholarly journals Light-scattering signal may indicate critical time zone to rescue brain tissue after hypoxia

2011 ◽  
Vol 16 (2) ◽  
pp. 027002 ◽  
Author(s):  
Satoko Kawauchi ◽  
Shunichi Sato ◽  
Yoichi Uozumi ◽  
Hiroshi Nawashiro ◽  
Miya Ishihara ◽  
...  
Keyword(s):  
Light Scattering ◽  
Brain Tissue ◽  
Critical Time ◽  
Time Zone ◽  
Scattering Signal

Reappearance of slow mode in mixtures of polyethylene glycol and poly(sodium methacrylate)

Soft Matter ◽  
2018 ◽  
Vol 14 (24) ◽  
pp. 5039-5047
Author(s):  
Ksenija Kogej ◽  
Jaka Štirn ◽  
Jurij Reščič
Keyword(s):  
Polyethylene Glycol ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Ethylene Glycol ◽  
Slow Mode ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Scattering Signal ◽  
Sodium Methacrylate

After addition of poly(ethylene glycol) to a solution of poly(sodium methacrylate), the slow-mode dynamic light scattering signal reappears.

Acoustic Emission From Simple Upsetting of Solid Cylinders

1982 ◽  
Vol 104 (2) ◽  
pp. 145-152 ◽  
Author(s):  
David A. Dornfeld ◽  
Edward Diei
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission ◽  
Count Rate ◽  
Effective Strain ◽  
Signal Amplitude ◽  
Amplitude Distribution ◽  
Degree Of Deformation ◽  
Surface Cracking ◽  
Cumulative Count ◽  
Ae Signals

Acoustic emission (AE) generated during simple upsetting (forging) of solid cylinders contains information that could potentially be used to separate the upsetting process into a range of zones of plastic deformation and a zone of both plastic deformation and cracking. This investigation monitored the AE signals during the upsetting of cylindrical specimens of 7075-T6 Aluminum from the start of plastic deformation through eventual cracking. The count rate (N˙) and cumulative count (N) as a function of effective strain were determined. The count rate data are characterized by three distinct regions, an initial peak during yielding of the material, a period of gradual increase during the progression of plastic deformation and the accompanying changes in specimen geometry, and finally a region of rapid increase in N˙ as cracking begins. The cumulative count and rms data follow similar patterns. An analysis of the amplitude distribution of the cumulative count data over a range of strain was made, and in the region of higher amplitude emissions, changes in the distribution of up to two orders of magnitude are observed for data obtained during plastic deformation and surface cracking compared to that from the region of pure deformation only. If plotted as log count (N) versus signal amplitude, the resulting data can be fit with a line using least squares methods yielding a power law relationship sensitive to the degree of deformation.

Enhancement of Brillouin light scattering signal with anti-reflection layers on magnetic thin films

2020 ◽  
Vol 502 ◽  
pp. 166565
Author(s):  
Jinyong Jung ◽  
June-Seo Kim ◽  
Joonwoo Kim ◽  
Jaehun Cho ◽  
Chun-Yeol You
Keyword(s):  
Thin Films ◽  
Light Scattering ◽  
Magnetic Thin Films ◽  
Brillouin Light Scattering ◽  
Scattering Signal

scholarly journals Amplitude Distribution of Partial Discharge Signals on Tunnel-Installed High-Voltage Cables

2019 ◽  
Vol 9 (21) ◽  
pp. 4595 ◽  
Author(s):  
Yong Qian ◽  
Xiaoxin Chen ◽  
Yiming Zang ◽  
Hui Wang ◽  
Gehao Sheng ◽  
...  
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Current Method ◽  
Signal Amplitude ◽  
Amplitude Distribution ◽  
Xlpe Cable ◽  
Bonding Wires ◽  
Cable Laying ◽  
Cable Systems ◽  
The Cross

For 110 kV and above tunnel-installed high-voltage (HV) cross-linked poly-ethylene (XLPE) cable systems, it is a normal procedure to adopt a cross-bonding scheme. The high-frequency current method is frequently used in the cross-bonded cable systems for on-site or online partial discharge (PD) detection by monitoring the signals on the cross-bonding wires. To further study the amplitude distribution characteristics of the PD signals, a parametric characteristic admittance model of a three-phase cable system in a tunnel is established based on Tylavsky’s formulas. The model is used to calculate the amplitude distribution formula of the PD pulse current on the cross-bonding wires. In addition, the influence of cable laying and tunnel environment on the amplitude distribution is also studied. Finally, the correctness of the model and the conclusion are verified by simulation experiments and on-site tests. The results show that the signal amplitude distribution is determined by the ratio of the characteristic admittances. As the distance between the cables and the distance from the inner wall of the tunnel increase, the amplitude difference gradually decreases.

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