Independence of short time scale fluctuations of quasi-periodic oscillations and low-frequency noise in GX 5-1

1990 ◽  
Vol 361 ◽  
pp. 514 ◽  
Author(s):  
J. P. Norris ◽  
P. Hertz ◽  
K. S. Wood ◽  
B. A. Vaughan ◽  
P. F. Michelson ◽  
...  
Keyword(s):  
Time Scale ◽  
Low Frequency ◽  
Short Time Scale ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Periodic Oscillations ◽  
Short Time

The quasi-periodic oscillations and very low frequency noise of Scorpius X-1 as transient chaos - A dripping handrail?

1993 ◽  
Vol 411 ◽  
pp. L91 ◽  
Author(s):  
Jeffrey D. Scargle ◽  
Thomas Steiman-Cameron ◽  
Karl Young ◽  
David L. Donoho ◽  
James P. Crutchfield ◽  
...  
Keyword(s):  
Low Frequency ◽  
Transient Chaos ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Periodic Oscillations ◽  
Very Low Frequency

Low Frequency Noise Level Variations and Annoyance in Working Environments

1997 ◽  
Vol 16 (2) ◽  
pp. 81-87 ◽  
Author(s):  
Kjell Holmberg ◽  
Ulf Landström ◽  
Anders Kjellberg
Keyword(s):  
Noise Level ◽  
Low Frequency ◽  
Personal Control ◽  
Frequency Noise ◽  
Strongly Correlated ◽  
Low Frequency Noise ◽  
Working Environments ◽  
Independent Variable ◽  
Short Time ◽  
Made In

Indicators of noise level variations were correlated to noise annoyance in workplaces. This was made in a selected group exposed to low frequency noise. The low frequency noise group, consisting of 35 individuals, was selected from a group of 337 persons from various working environments. The noise was recorded at each person's workplace. The subjective annoyance response was rated in a questionnaire. Further questions regarding situational and individual factors were also included. The indicators were statistical countings of successive differences between discrete Leq values over short time periods. Interaction between noise level variations and other factors was also included in the study. The correlation was studied by multiple regression analysis with the rated annoyance as dependent variable. Personal control over the noise was entered into the analysis as a first independent variable. Change in R2 when entering the level variations reflected the relative importance of them in comparison to noise level. According to the results low frequency noise level variation explains about 11 percent of the annoyance variance in this material. In the study it was also found that personal control over the low frequency noise was strongly correlated to rated annoyance and that noise level was not.

scholarly journals Quasi-Periodic Oscillations in Low-Mass X-ray Binaries

1987 ◽  
Vol 125 ◽  
pp. 321-331
Author(s):  
M. van der Klis
Keyword(s):  
Neutron Star ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Periodic Oscillations ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

The properties of the rapid, persistent quasi-periodic oscillations (QPO) discovered with EXOSAT in the X-ray flux of at least 7 bright low-mass X-ray binaries are described. Particular attention is given to the various relations observed between QPO frequency and X-ray intensity, the link between QPO and the low-frequency noise in the X-ray intensity and the bimodal properties of in particular Sco X-1, GX 5-1 and Cyg X-2. The merits of the hypothesis that the QPO indicate the presence of a neutron star with a magnetosphere are considered.

Estimating the Quality of Thermionic Cathodes for Microwave Vacuum Tubes Using the Low-Frequency Noise Parameters

Vestnik MEI ◽  
2018 ◽  
Vol 5 (5) ◽  
pp. 120-127
Author(s):  
Mikhail D. Vorobyev ◽  
◽  
Dmitriy N. Yudaev ◽  
Andrey Yu. Zorin ◽  
◽  
...  
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Parameters ◽  
Thermionic Cathodes ◽  
Vacuum Tubes

Simulation of Low Frequency Noise in a CCTWT

1999 ◽  
Author(s):  
Charles K. Birdsall ◽  
J. P. Varboncoeur ◽  
P. J. Christensen
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise
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