Significant Frequency Range of Brain Wave Signals for Authentication

2015 ◽  
pp. 103-113 ◽  
Author(s):  
Preecha Tangkraingkij
Keyword(s):  
Frequency Range ◽  
Brain Wave ◽  
Significant Frequency

scholarly journals Analysis of Recognition Processes by Measurement of Brain Waves and Temperature Distributions

1992 ◽  
Vol 4 (1) ◽  
pp. 63-69
Author(s):  
Hideto Ide ◽  
◽  
Masafumi Uchida
Keyword(s):  
Temperature Distribution ◽  
Temperature Measurement ◽  
Parietal Lobe ◽  
Statistic Analysis ◽  
Frequency Range ◽  
Brain Wave ◽  
Brain Waves ◽  
The Past ◽  
Temperature Distributions ◽  
General Method

In the past, in study of the evoked brain wave, the averaging was the most general method for analysis of signal components in brain wave. Specially, the averaging was applied for several evoked brain waves on the process of recognition to the stimulation, i.e. P300. However, any information for the averaging. The averaging is difficult to evaluate the evoked brain wave because of it's characteristics. In this study, it was the purpose to reveal the frequency range, the latency and the acyive parts of brain by following two method. 1) frequency and statistic analysis of evoked brain wave 2) measurement of temperature distribution on the surface of the head. The experiment for the measurement of the evoked brain wave was applied to fifteen men whose age were from 22 to 25. After frequency and statistic analysis, and waves were obtained at about 300ms latency. This result is as same as the averaging's result. From the temperature measurement, it was considered that the recognition to the stimulation was performed at the parietal lobe.

Density-based discrimination of protein and RNA in the ribosome

1992 ◽  
Vol 50 (1) ◽  
pp. 464-465
Author(s):  
Joachim Frank
Keyword(s):  
Transfer Function ◽  
Spatial Frequency ◽  
Three Dimensional ◽  
Wiener Filter ◽  
Dark Field Image ◽  
Dark Field ◽  
Frequency Range ◽  
Bright Field ◽  
Contrast Transfer Function ◽  
Pass Filter

Cryo-electron microscopy combined with single-particle reconstruction techniques has allowed us to form a three-dimensional image of the Escherichia coli ribosome.In the interior, we observe strong density variations which may be attributed to the difference in scattering density between ribosomal RNA (rRNA) and protein. This identification can only be tentative, and lacks quantitation at this stage, because of the nature of image formation by bright field phase contrast. Apart from limiting the resolution, the contrast transfer function acts as a high-pass filter which produces edge enhancement effects that can explain at least part of the observed variations. As a step toward a more quantitative analysis, it is necessary to correct the transfer function in the low-spatial-frequency range. Unfortunately, it is in that range where Fourier components unrelated to elastic bright-field imaging are found, and a Wiener-filter type restoration would lead to incorrect results. Depending upon the thickness of the ice layer, a varying contribution to the Fourier components in the low-spatial-frequency range originates from an “inelastic dark field” image. The only prospect to obtain quantitatively interpretable images (i.e., which would allow discrimination between rRNA and protein by application of a density threshold set to the average RNA scattering density may therefore lie in the use of energy-filtering microscopes.

Evaluation of Special Hearing Aids for Deaf Children

1971 ◽  
Vol 36 (4) ◽  
pp. 527-537 ◽  
Author(s):  
Norman P. Erber
Keyword(s):  
Hearing Aids ◽  
High Frequency ◽  
Hearing Aid ◽  
Low Frequency ◽  
Acoustic Stimulation ◽  
Deaf Children ◽  
Frequency Range ◽  
Frequency Limit ◽  
Unpublished Studies ◽  
Published Research

Two types of special hearing aid have been developed recently to improve the reception of speech by profoundly deaf children. In a different way, each special system provides greater low-frequency acoustic stimulation to deaf ears than does a conventional hearing aid. One of the devices extends the low-frequency limit of amplification; the other shifts high-frequency energy to a lower frequency range. In general, previous evaluations of these special hearing aids have obtained inconsistent or inconclusive results. This paper reviews most of the published research on the use of special hearing aids by deaf children, summarizes several unpublished studies, and suggests a set of guidelines for future evaluations of special and conventional amplification systems.

LSD and Brain Wave Responses to Color

2013 ◽  
Author(s):  
Barbara B. Brown
Keyword(s):  
Brain Wave

BEHAVIOR OF FERRITES IN THE MICROWAVE FREQUENCY RANGE

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-443-C1-451 ◽  
Author(s):  
E. SCHLÖMANN
Keyword(s):  
Microwave Frequency ◽  
Frequency Range

The influence of external conditions on sound pressure in the pistonphone at the infrasound frequency range

2020 ◽  
pp. 67-72
Author(s):  
A. V. Konkov ◽  
D. V. Golovin
Keyword(s):  
Environmental Conditions ◽  
Sound Pressure ◽  
Primary Method ◽  
Frequency Range ◽  
External Conditions ◽  
Numerical Estimations

The influence of environmental conditions on a sound pressure reproduced by the primary method in the measuring chambers of the Pistonphone in the frequency range from 1 mHz to 250 Hz is estimated. Numerical estimations of influence of environmental conditions on sound pressure in pistonphone measuring chambers are given and special requirements to system of maintenance of required external conditions are specified.

The working standard of the unit of power of electromagnetic waves in the frequency range from 37,5 to 220 GHz

2020 ◽  
pp. 53-58
Author(s):  
A. V. Koudelny ◽  
I. M. Malay ◽  
V. A. Perepelkin ◽  
I. P. Chirkov
Keyword(s):  
Microwave Power ◽  
Electromagnetic Waves ◽  
Primary Standard ◽  
The State ◽  
Frequency Range ◽  
Working Standard ◽  
Extended Frequency Range ◽  
Effective Efficiency ◽  
Extended Frequency ◽  
Good Agreement

The possibility of using bolometric converters of microwave power from the State primary standard of the unit of power of electromagnetic waves in waveguide and coaxial paths GET 167-2017, which has a frequency range from 37,5 to 78,33 GHz, in an extended frequency range up to 220 GHz, is shown. Studies of semiconductor bolometric converters of microwave power in an extended frequency range have confirmed good agreement and smooth frequency characteristics of the effective efficiency factor of the converters. Based on the research results, the State working standard of the unit of power of electromagnetic waves of 0,1–10 mW in the frequency range from 37,5 to 220 GHz 3.1.ZZT.0288.2018 was approved. The technical characteristics of the working standard of the unit of power of electromagnetic oscillations in an extended frequency range from 37,5 to 220 GHz are given.

Portable Bioimpedance Spectrometer for Total Frequency Range of β-Dispersion

2013 ◽  
Vol 80 (11) ◽  
Author(s):  
Dhouha Bouchaala ◽  
Olfa Kanoun ◽  
Nabil Derbel
Keyword(s):  
Frequency Range ◽  
Total Frequency
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