Zobrazeno 1 - 10
of 22
pro vyhledávání: '"I. L. Freeston"'
Autor:
I L Freeston, R C Tozer
Publikováno v:
Physiological Measurement. 16:A257-A266
The principal features of an electrical impedance tomography system using induced currents are described. Images of the distribution of conductivity in a two-dimensional phantom are obtained using an algorithm based on a sensitivity matrix. Results a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d3ae28a72f6e4951170e772956cf538
https://doi.org/10.1088/0967-3334/16/3a/024
https://doi.org/10.1088/0967-3334/16/3a/024
Publikováno v:
Journal of Medical Engineering & Technology. 19:57-61
The technique of combined magnetic and electrical stimulation of a peripheral nerve was used to determine the effectiveness of the combined stimulus and its dependence on the relative positioning of electrodes and stimulator coil along the axis of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c4868b76d02309a12bb1b3f50fd18805
https://doi.org/10.3109/03091909509030275
https://doi.org/10.3109/03091909509030275
Publikováno v:
Europe PubMed Central
Detailed investigation of abnormal heart rhythms requires electrical stimulators that can deliver sophisticated sequences of stimuli to the heart under controlled laboratory conditions. A dual-channel stimulator that provides an appropriate hardware
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a7d542b505d6887b56b61a45a88a6ed
https://doi.org/10.3109/03091909109015441
https://doi.org/10.3109/03091909109015441
Publikováno v:
Medical & Biological Engineering & Computing. 20:286-292
A series of algorithms are described which detect breaths, from the respiratory waveform obtained from indirect respiratory monitors. The major problem is that the waveform contains artefacts which must be identified as such and not identified as bre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::728b31793b323c7c0f02269b8f780951
https://doi.org/10.1007/bf02442794
https://doi.org/10.1007/bf02442794
Publikováno v:
Medical & Biological Engineering & Computing. 20:293-298
A major problem with impedance pneumography is the artefact on the respiratory waveform caused by the beating of the heart. Three filters are described for reducing the amplitude of this artefact; (i) signal averaging, (ii) analogue filtering, and (i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68621962cdbf77a1639e3fae666d4b72
https://doi.org/10.1007/bf02442795
https://doi.org/10.1007/bf02442795
Publikováno v:
Clinical Physics and Physiological Measurement. 4:403-416
The development and evaluation of a sensory electrical substitution aid for the profoundly deaf is described. The aid is a small wrist-worn device which converts sound into an electrical stimulus at the wrist. The initial aim was to give profoundly d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::543caae6c651d49757a90f98c40b68f8
https://doi.org/10.1088/0143-0815/4/4/005
https://doi.org/10.1088/0143-0815/4/4/005
Autor:
I. L. Freeston
Publikováno v:
Journal of Plasma Physics. 2:329-337
The admittance of a plane grid capacitor immersed in an ion beam plasma has been measured, and the results are in general agreement with the kinetic theory of the admittance (Buckley 1968). With a steady bias potential applied to the grids, the resul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::acc92d8f8ef77ffeb2f6ad78b921e371
https://doi.org/10.1017/s002237780000386x
https://doi.org/10.1017/s002237780000386x
Publikováno v:
Journal of Physics E: Scientific Instruments. 5:19-23
A laboratory plasma of density of the order of 3*1012 electrons/m3, electron temperature 0.15 eV mean free paths greater than 1 m, and which was designed to simulate the ionospheric plasma, is described. The plasma is formed by neutralizing an ion be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3cfe1587c90eae6e84e1292bc09c184d
https://doi.org/10.1088/0022-3735/5/1/010
https://doi.org/10.1088/0022-3735/5/1/010
Autor:
I. L. Freeston, R. K. Gupta
Publikováno v:
International Journal of Electronics. 32:623-631
A general mathematical theory is formulated to investigate the effect of displacement of the feed points on three types of linear dipole aerials, an unloaded dipole aerial, a loaded dipole aerial, and a terminated dipole aerial. The radiation propert
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89a452dc951f971ba93816b0e461dbb3
https://doi.org/10.1080/00207217208938326
https://doi.org/10.1080/00207217208938326
Autor:
I. L. Freeston, R. K. Gupta
Publikováno v:
International Journal of Electronics. 29:185-189
The radiation properties of a travelling wave antenna with displaced feed points are investigated. Expressions are derived to predict the effect of the displacement of the feed points on the far zone field strength and the radiation resistance. It is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c40639a4d4359450c3feeb284842b33
https://doi.org/10.1080/00207217008900202
https://doi.org/10.1080/00207217008900202