Slow-wave directional coupler and its applications

1986 ◽  
Vol 7 (10) ◽  
pp. 1417-1427 ◽  
Author(s):  
Hiroyo Ogawa ◽  
Tatsuo Itoh
Keyword(s):  
Slow Wave ◽  
Directional Coupler

scholarly journals Forward‐wave directional coupler based on slow‐wave coupled microstrip lines

2019 ◽  
Vol 13 (14) ◽  
pp. 2486-2489
Author(s):  
Duc‐Long Luong ◽  
Giuseppe Acri ◽  
Florence Podevin ◽  
Didier Vincent ◽  
Emmanuel Pistono ◽  
...  
Keyword(s):  
Slow Wave ◽  
Directional Coupler ◽  
Forward Wave ◽  
Microstrip Lines

Sa1640 NONINVASIVE MEASUREMENT OF SMALL BOWEL SLOW WAVE ACTIVITY IN NEONATES - A PILOT STUDY

2020 ◽  
Vol 158 (6) ◽  
pp. S-364
Author(s):  
Suseela Somarajan ◽  
Nicole D. Muszynski ◽  
Aurelia s. Monk ◽  
Joseph D. Olson ◽  
Alexandra Russell ◽  
...  
Keyword(s):  
Pilot Study ◽  
Small Bowel ◽  
Slow Wave ◽  
Wave Activity ◽  
Slow Wave Activity ◽  
Noninvasive Measurement

Face and Word Recognition in Patients with Left and Right Hemispheric Lesions: Evidence from Reaction Times and ERPs

2002 ◽  
Vol 13 (1) ◽  
pp. 69-83 ◽  
Author(s):  
Stefan R. Schweinberger ◽  
Thomas Klos ◽  
Werner Sommer
Keyword(s):  
Slow Wave ◽  
Reaction Times ◽  
Memory Search ◽  
Event Related Potentials ◽  
Performance Deficits ◽  
Set Size ◽  
Left Brain ◽  
Related Potentials ◽  
Abstract Words ◽  
Left Brain Damage

Abstract: We recorded reaction times (RTs) and event-related potentials (ERPs) in patients with unilateral lesions during a memory search task. Participants memorized faces or abstract words, which were then recognized among new ones. The RT deficit found in patients with left brain damage (LBD) for words increased with memory set size, suggesting that their problem relates to memory search. In contrast, the RT deficit found in patients with RBD for faces was apparently related to perceptual encoding, a conclusion also supported by their reduced P100 ERP component. A late slow wave (720-1720 ms) was enhanced in patients, particularly to words in patients with LBD, and to faces in patients with RBD. Thus, the slow wave was largest in the conditions with most pronounced performance deficits, suggesting that it reflects deficit-related resource recruitment.

Slow Wave Activity Related to Working Memory Maintenance in the N-Back Task

2016 ◽  
Vol 30 (4) ◽  
pp. 141-154 ◽  
Author(s):  
Kira Bailey ◽  
Gregory Mlynarczyk ◽  
Robert West
Keyword(s):  
Working Memory ◽  
Slow Wave ◽  
Time Course ◽  
Relevant Information ◽  
Wave Activity ◽  
Slow Wave Activity ◽  
Response Accuracy ◽  
Functional Neuroanatomy ◽  
Stimulus Interval ◽  
Back Task

Abstract. Working memory supports our ability to maintain goal-relevant information that guides cognition in the face of distraction or competing tasks. The N-back task has been widely used in cognitive neuroscience to examine the functional neuroanatomy of working memory. Fewer studies have capitalized on the temporal resolution of event-related brain potentials (ERPs) to examine the time course of neural activity in the N-back task. The primary goal of the current study was to characterize slow wave activity observed in the response-to-stimulus interval in the N-back task that may be related to maintenance of information between trials in the task. In three experiments, we examined the effects of N-back load, interference, and response accuracy on the amplitude of the P3b following stimulus onset and slow wave activity elicited in the response-to-stimulus interval. Consistent with previous research, the amplitude of the P3b decreased as N-back load increased. Slow wave activity over the frontal and posterior regions of the scalp was sensitive to N-back load and was insensitive to interference or response accuracy. Together these findings lead to the suggestion that slow wave activity observed in the response-to-stimulus interval is related to the maintenance of information between trials in the 1-back task.

Is a frontal positive slow wave in the ERP specific for emotion-focused processing?

1996 ◽  
Author(s):  
Stefanie Maier ◽  
Oliver Diedrich ◽  
Gabriele Becker ◽  
Ewald Naumann ◽  
Dieter Bartussek
Keyword(s):  
Slow Wave ◽  
Focused Processing

Therapieschwierige Epilepsien am Beispiel der Rasmussen-Enzephalitis

2012 ◽  
Vol 12 (06) ◽  
pp. 368-370
Author(s):  
A. Merkenschlager ◽  
I. Sorge ◽  
A. Bertsche ◽  
M. K. Bernhard ◽  
F. Wegmann
Keyword(s):  
Slow Wave ◽  
Psychische Belastung ◽  
Sich Eine ◽  
Neurologische Defizite

Zusammenfassung Einleitung: Bis zu einem Drittel der Epilepsiepatienten leidet unter einer therapieschwierigen Epilepsie. Dies bedeutet eine erhebliche Belastung im Alltag, zudem können neurologische Defizite resultieren. Wieso die Patienten nicht auf die vorhandenen Therapieoptionen ansprechen, ist noch weitestgehend unklar. Die Rasmussen-Enzephalitis (RE) ist ein Beispiel für eine therapieschwierige Epilepsie. Fallbericht: Nach unauffälliger motorischer und sprachlicher Entwicklung traten im Alter von 6 Jahren bei dem Mädchen das erste Mal fokale und komplex-fokale Krampfanfälle auf. Auch unter antikonvulsiver Polytherapie konnte eine Anfallsfreiheit nicht erreicht werden. Zudem entwickelte sich eine über viele Jahre progrediente Hemiatrophia cerebri, und es zeigten sich einseitig betonte epilepsietypische EEG-Muster mit Verlangsamungen und sharp-slow-wave-Komplexen. In Zusammenschau dieser Befunde konnte die Diagnose einer Rasmussen-Enzephalitis gestellt werden. Repetitive Stoßtherapien mit Methylprednisolon und Immunglobulinen brachten kurzfristig eine Linderung der Krampfsituation, die neurologischen Defizite und die daraus resultierende enorme psychische Belastung waren jedoch progredient. Diskussion: Am ehesten wird von einer autoimmunen Reaktion als Ursache der Rasmussen Enzephalitis ausgegangen. Ein optimales medikamentöses Therapieschema dieser Epilepsie gibt es bis heute nicht. Eine frühzeitige Diagnosestellung und sofortiger Therapiebeginn lassen die Krankheit jedoch meist langsamer und weniger schwerwiegend voranschreiten. Einzig die Hemisphärektomie bringt in bis zu 85 % der Fälle eine Anfallsfreiheit. Die damit einhergehende spastische Hemiparese, Hemianopsie sowie Sprachstörungen lassen die Entscheidung zur Operation jedoch schwer fallen. Gemeinsam mit dem Patienten und seiner Familie muss eine sorgfältige Risiko-NutzenAbwägung erfolgen.

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

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