Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Apostolos C. Raptis"'
Autor:
Thomas W. Elmer, Apostolos C. Raptis, Sasan Bakhtiari, Nachappa Gopalsami, Eugene R. Koehl, Shaolin Liao
Publikováno v:
IEEE Transactions on Terahertz Science and Technology. 4:307-313
In this paper, we have built and tested a mixerless sub-terahertz (sub-THz) Doppler radar consisting of just a continuous wave (CW) source and a Schottky diode intensity detector based on optical interferometry technique. The reference arm features a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ec8dc8f967a4089ce5b99a0d4c699c0
https://doi.org/10.1109/tthz.2014.2307165
https://doi.org/10.1109/tthz.2014.2307165
Publikováno v:
IEEE Transactions on Nuclear Science. 60:3014-3024
Detection and identification of radioactive nuclear materials in urban searches can be fully performed with a portable gamma ray detector-spectrometer. Due to limited acquisition time and, as a consequence, low signal to noise ratio (SNR), developmen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22be0faebe6f255bb7c60815440520ac
https://doi.org/10.1109/tns.2013.2265307
https://doi.org/10.1109/tns.2013.2265307
Autor:
Alexander Heifetz, Nachappa Gopalsami, Thomas W. Elmer, Apostolos C. Raptis, Eugene R. Koehl, Shaolin Liao, K. Avers, E. Dieckman
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 61:2042-2050
We have developed two passive millimeter-wave imagers for terrestrial remote sensing: one is an integrated imaging and spectroscopy system in the 146-154-GHz range with 16 channels of 500-MHz bandwidth each, and the other is a single-channel dual-pol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29607879e64041b4dd2cbcd5835e1d35
https://doi.org/10.1109/tim.2012.2183032
https://doi.org/10.1109/tim.2012.2183032
Autor:
Nachappa Gopalsami, Eugene R. Koehl, Apostolos C. Raptis, Shaolin Liao, Thomas W. Elmer, Alexander Heifetz, Hual-Te Chien
Publikováno v:
IEEE Transactions on Plasma Science. 40:990-994
We have investigated the effect of pre-ionization by a radioactive -ray source on the atmospheric air breakdown conditions in a high-voltage spark gap. A standoff millimeter-wave (mmW) system was used to monitor the breakdown properties. A decrease i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38a83cbc83061bf15242b9d4a2a5ead7
https://doi.org/10.1109/tps.2012.2187343
https://doi.org/10.1109/tps.2012.2187343
Autor:
Apostolos C. Raptis, Thomas W. Elmer, Alan V. Sahakian, Nachappa Gopalsami, Sasan Bakhtiari, Ilya V. Mikhelson, Shaolin Liao, N. M. Cox
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 61:830-841
A compact millimeter-wave (MMW) sensor has been developed for remote monitoring of human vital signs (heart and respiration rate). The low-power homodyne transceiver operating at 94 GHz was assembled by using solid-state active and passive block-type
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ffc74ccb9a60969a88079315d028033
https://doi.org/10.1109/tim.2011.2171589
https://doi.org/10.1109/tim.2011.2171589
Autor:
P. Fiflis, Nachappa Gopalsami, Shaolin Liao, Thomas W. Elmer, Eugene R. Koehl, Alexander Heifetz, Apostolos C. Raptis, Hual-Te Chien
Publikováno v:
IEEE Geoscience and Remote Sensing Letters. 8:617-620
We present observations of microwave scattering from ambient room air ionized with a negative ion generator. The frequency dependence of the radar cross section of ionized air was measured from 26.5 to 40 GHz (Ka-band) in a bistatic mode with an Agil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47dbaa4c9f1cfa6b9e6929dcf319148a
https://doi.org/10.1109/lgrs.2010.2098016
https://doi.org/10.1109/lgrs.2010.2098016
Publikováno v:
IEEE Transactions on Biomedical Engineering. 58:1839-1845
This paper analyzes heart rate (HR) information from physiological tracings collected with a remote millimeter wave (mmW) I-Q sensor for biometric monitoring applications. A parameter optimization method based on the nonlinear Levenberg-Marquardt alg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7489639b3cd3805c935e061daec92848
https://doi.org/10.1109/tbme.2011.2122335
https://doi.org/10.1109/tbme.2011.2122335
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 56:700-709
Passive millimeter-wave systems have been used in the past to remotely map solid targets and to measure low-pressure spectral lines of stratospheric and interstellar gases; however, its application to pressure-broadened spectral line detection of ind
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b5902e93454166e83d94e7221949906
https://doi.org/10.1109/tmtt.2008.916985
https://doi.org/10.1109/tmtt.2008.916985
Autor:
Ivan Osorio, Apostolos C. Raptis, Nachappa Gopalsami, A. Martynov, Stanislav Kulikov, S. A. Buyko
Publikováno v:
IEEE Sensors Journal. 7:977-982
An implantable surface acoustic wave (SAW) microsensor has been developed for early detection and monitoring of seizures based on local temperature changes in the brain's epileptogenic zones that occur prior to and during an epileptic event. Three SA
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16366f0ebde9ad0c50e7261164976e6a
https://doi.org/10.1109/jsen.2007.895974
https://doi.org/10.1109/jsen.2007.895974
Publikováno v:
Review of Scientific Instruments. 73:259-262
Laser-based cavity ringdown techniques have demonstrated ultrahigh sensitivities for trace gas detection in the optical and infrared wavelength regions. We have investigated the applicability of the cavity ringdown technique in the millimeter wave re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b4fe78ca23c7d6ed2fc30f63dfbe107
https://doi.org/10.1063/1.1435846
https://doi.org/10.1063/1.1435846