Investigation of Slow-Wave Systems Applying Versatile Electromagnetic Simulation and Design Tools

2017 ◽  
pp. 199-244
Author(s):  
Stanislovas Staras ◽  
Romanas Martavicius ◽  
Julius Skudutis ◽  
Vytautas Urbanavicius ◽  
Vladislavas Daskevicius
Keyword(s):  
Slow Wave ◽  
Electromagnetic Simulation ◽  
Design Tools

Study of effective permittivity for a multilayer substrate dipole antenna

2020 ◽  
pp. 1-6
Author(s):  
Julien Moussa H. Barakat ◽  
Fabien Ndagijimana
Keyword(s):  
Computer Aided Design ◽  
Effective Permittivity ◽  
Dipole Antenna ◽  
Integrated Systems ◽  
Electromagnetic Simulation ◽  
Design Tools ◽  
Analytic Model ◽  
Time Required ◽  
Aided Design ◽  
Multilayer Substrate

Abstract The design of integrated systems requires the knowledge of the values of the effective permittivity of the substrate. Designing antenna using computer-aided design tools is a long process that necessitates doing iterative steps to find the correct dimensions that meet specific requirements at a certain operating frequency. The objective of this work is to propose an analytic model to reduce the time required for the design. By using electromagnetic simulation, the effect of the relative permittivity and the height of the substrate on the final effective permittivity have been studied. An analytic model that helps the designer in estimating the value of the effective permittivity has been proposed.

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

Soldier-Centered Design Tools: Recent Developments, Challenges, and Paths Forward

2005 ◽  
Author(s):  
John K. Hawley ◽  
John F. Lockett ◽  
Laurel E. Allender
Keyword(s):  
Design Tools ◽  
Recent Developments

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.

Perancangan Pengkondisian Udara pada Ruangan Steril Rumah Sakit Mitra Medika dengan Standard Cleanroom Menggunakan Instalasi Ducting

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Fremmy Raymond Agustinus
Keyword(s):  
Air Conditioning ◽  
Static Pressure ◽  
Filter Medium ◽  
Positive Pressure ◽  
Design Tools ◽  
Microsoft Excel ◽  
Cooling Unit ◽  
X 24 ◽  
Air Passage ◽  
Booster Fan

Desain penyejuk udara juga dapat diterapkan di bidang kesehatan, dengan standar Cleanroom dapat diperoleh suhu, kelembaban, kenyamanan dan kebersihan yang dibutuhkan untuk ruang steril (ruang bedah). Perancangan pendingin udara dalam hal ini dilakukan dengan menentukan beban pendinginan yang diperlukan untuk ruang steril (ruang bedah), kemudian menentukan ukuran ducting, jalur ducting, dan jumlah penggunaan ducting. Desain ini menggabungkan unit split saluran yang dimodifikasi, kipas booster, filter pra, filter medium, dan filter HEPA dengan menggunakan saluran aluminium preinsulated sebagai saluran udara. Desain dilakukan dengan menggunakan perangkat lunak AutoCAD 2012, Design Tools Duct Sizer, dan Microsoft Excel. Dari hasil perhitungan dan desain didapatkan kebutuhan kapasitas 3 ruang bedah yaitu ducted ducted 100.000 BTUH sebanyak 3 unit, booster fan 3.3 - 4 Di WG sebanyak 3 unit, pre filter 24 "x 24" x 2 "6 set, filter menengah 610 x 610 x 290 mm 6 set, dan filter HEPA 1220 x 610 x 70 mm 12. Untuk ruang steril, tekanan statis yang dihasilkan oleh unit pendingin harus lebih besar daripada tekanan statis yang dihasilkan dari unit yang ada. di ruang semi steril. Dengan kata lain, ruang steril harus memiliki tekanan positif terhadap ruang semi steril. Hal ini dimaksudkan agar udara di ruang semi steril tidak masuk ke ruang steril ketika pintu antar ruangan dibuka. Desain dan perhitungan ruang bedah, suhu nyata yang diperoleh adalah 23 ° C ± 2 ° C dan kelembaban relatif yang diperoleh adalah 60% ± 2%.   Air conditioning design can also be applied in the health field, with cleanroom standard can be obtained temperature, humidity, comfort and hygiene needed for sterile room (surgical room). The design of air conditioning in this case is done by determining the cooling load required for the sterile room (surgical room), then determining the ducting size, ducting path, and the amount of ducting usage. This design combines modified ducted split unit, booster fan, pre filter, medium filter, and HEPA filter by using preinsulated aluminum duct as an air passage. The design is done by using AutoCAD 2012 software, Design Tools Duct Sizer, and Microsoft Excel. From the calculation and design result obtained the capacity requirement of 3 surgical room that is split ducted 100.000 BTUH as many as 3 units, booster fan 3.3 - 4 In WG as many as 3 units, pre filter 24"x 24" x 2" 6 sets, medium filter 610 x 610 x 290 mm 6 sets, and HEPA filter 1220 x 610 x 70 mm 12 sets. For the sterile room, the static pressure generated by the cooling unit shall be larger than the static pressure generated from the unit present in the semi sterile room. In other words, the sterile room must have positive pressure to the semi sterile room. It is intended that the air in the semi sterile room does not enter into the sterile room when the door between room opened. In this surgical room design and calculation, real temperature obtained is 23 °C ± 2 °C and the relative moisture obtained is 60% ± 2%.

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