Zobrazeno 1 - 5
of 5
pro vyhledávání: '"R. J. Helmer"'
Autor:
R. J. Helmer, D. R. Spiegel
Publikováno v:
American Journal of Physics. 63:554-560
We report the design and performance of a simple apparatus for measurement of shot‐noise fluctuations in the current from a vacuum photodiode illuminated with a pilot‐lamp light bulb. After calibrating the frequency‐dependent gain of the measur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c32a7541eba8fd44c5a25fdd8ad3702c
https://doi.org/10.1119/1.17867
https://doi.org/10.1119/1.17867
Autor:
R. J. Helmer
Publikováno v:
Behavior Research Methods & Instrumentation. 7:15-18
Inexpensive designs for two components of an EEG biofeedback system are described. A two-channel modulator accepts a pair of input signals for modulation of two audio carrier frequencies a musical fifth apart. Carrier suppression is obtained with a s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::828170cda49aeb667b0ab0a5edc86fce
https://doi.org/10.3758/bf03201281
https://doi.org/10.3758/bf03201281
Autor:
R. J. Helmer
Publikováno v:
Behavior Research Methods, Instruments, & Computers. 18:372-376
An instrument for generating simultaneous sinusoidal test signals m the range of 1–32 Hz for EEG equipment checkout procedures is described. A composite signal is produced by a method that separates the functions of waveform generation and control
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c7cd60478e9e9b3134cae8554e7acbf
https://doi.org/10.3758/bf03204420
https://doi.org/10.3758/bf03204420
Autor:
A. Hemmendinger, R. J. Helmer
Publikováno v:
Review of Scientific Instruments. 28:649-651
A current integrator has been built in which a servo is used to charge a capacitor in discrete amounts so as to match within certain limits the integral of an input current. By keeping the discrete charge small and the repetition rate for the increme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d06630e4d0fdb80376048e9977b6d0b2
https://doi.org/10.1063/1.1715963
https://doi.org/10.1063/1.1715963
Autor:
R. J. Helmer, Joel K. Levy
Publikováno v:
Behavior Research Methods & Instrumentation. 5:9-10
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9507ee4f9da1dc61f46afbaf9653e4ea
https://doi.org/10.3758/bf03200113
https://doi.org/10.3758/bf03200113