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Die Perfectly Matched Layer Randbedingung In Der Finite Differenzen Methode Im Frequenzbereich Implementierung Und Einsatzbereiche

Die Perfectly Matched Layer Randbedingung in der Finite Differenzen Methode im Frequenzbereich  Implementierung und Einsatzbereiche PDF
Author:
Publisher: Cuvillier Verlag
ISBN: 3736911130
Size: 10.25 MB
Format: PDF, ePub, Mobi
Category : Computers
Languages : de
Pages : 246
View: 7679

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Die vorliegende Arbeit behandelt den Einsatz der Perfectly-Matched-Layer (PML) absorb­ierenden Randbedingung im Rahmen der Frequenzbereichs-Formulierung der Finiten-Differ­enzen (FDFD). Mit Hilfe von analytischen Herleitungen werden charakteristische Effekte untersucht und erklärt, insbesondere der Einfluss von PML-Randgebieten auf das Modenspektrum von Wellenleitern. Es zeigt sich, dass durch die Randbedingung künstliche PML-Moden im interessierenden Spektrum auftreten können. Dazu wird ein effektives Kriterium zur Separation der PML- von den physikalischen Moden eingeführt und verifiziert. Diese Ergebnisse sind auch für die Zeitbereichsmethode der Finiten-Differenzen (FDTD) relevant. Mit der implementierten PML-Randbedingung gelingt eine umfassende Charakterisierung rückseitenmetallisierter Koplanarleitungen (CB-CPW) bis in den Terahertzbereich (1000 GHz). Neben einer genauen Berechnung der geometrischen Dispersion und der Abstrahlungs-Dämpf­ung erlaubt das vorgestellte Verfahren erstmals eine Analyse der diversen Kopplungseffekte zwischen Grundmoden und höheren Moden. Bei der Implementation der PML im 3D-Fall wird eine speziell an die integrale FD-Formulierung angepasste Wahl der Leitfähigkeiten für gradierte PML-Ränder verwendet. Dies ermöglicht hervorragende Absorptionsniveaus im Bereich von –60 dB für 5-lagige PML. Neben Strukturen mit Abstrahlung können damit auch dreidimensionale Geometrien großen Querschnitts simuliert werden, ohne dass künstliche Hohlraumresonanzen des finiten Rechengebietes die Resultate verfälschen.

The Matched Trilogy

The Matched Trilogy PDF
Author: Allyson Braithwaite Condie
Publisher: Dutton Childrens Books
ISBN: 9780525426264
Size: 68.21 MB
Format: PDF, ePub, Docs
Category : Juvenile Fiction
Languages : en
Pages : 1322
View: 3342

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Presents the three volumes of the author's Matched trilogy that follow Cassia's growing dissatisfaction with the Society and her struggle with choosing between Xander and Ky.

Matched Asymptotic Expansions In Reaction Diffusion Theory

Matched Asymptotic Expansions in Reaction Diffusion Theory PDF
Author: J.A. Leach
Publisher: Springer Science & Business Media
ISBN: 0857293966
Size: 58.72 MB
Format: PDF
Category : Mathematics
Languages : en
Pages : 290
View: 448

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This volume contains a wealth of results and methodologies applicable to a wide range of problems arising in reaction-diffusion theory. It can be viewed both as a handbook, and as a detailed description of the methodology. The authors present new methods based on matched asymptotic expansions.

Matched

Matched PDF
Author: S. E. Lund
Publisher: S. E. Lund
ISBN: 1988265673
Size: 45.42 MB
Format: PDF, Kindle
Category : Fiction
Languages : en
Pages : 282
View: 5218

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Introducing MATCHED, a new sexy standalone romance by USA Today Bestselling Author S. E. Lund. Everyone thinks Jon is in love with India and India is in love with Jon -- everyone except Jon and India. They don't want something as crass as sex to mess up their beautiful relationship as co-owners of a tech business that's on its way to the Forbes 1,000. When India's best friend matches them both with someone chosen using her new dating app, everything changes and they must come to terms with the truth about partnerships and love. WIll their beautiful relationship survive?

Perfectly Matched Layer Pml For Computational Electromagnetics

Perfectly Matched Layer  PML  for Computational Electromagnetics PDF
Author: Jean-Pierre Bérenger
Publisher: Morgan & Claypool Publishers
ISBN: 1598290835
Size: 59.90 MB
Format: PDF, ePub
Category : Science
Languages : en
Pages : 117
View: 7566

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This lecture presents the perfectly matched layer (PML) absorbing boundary condition (ABC) used to simulate free space when solving the Maxwell equations with such finite methods as the finite difference time domain (FDTD) method or the finite element method. The frequency domain and the time domain equations are derived for the different forms of PML media, namely the split PML, the CPML, the NPML, and the uniaxial PML, in the cases of PMLs matched to isotropic, anisotropic, and dispersive media. The implementation of the PML ABC in the FDTD method is presented in detail. Propagation and reflection of waves in the discretized FDTD space are derived and discussed, with a special emphasis on the problem of evanescent waves. The optimization of the PML ABC is addressed in two typical applications of the FDTD method: first, wave-structure interaction problems, and secondly, waveguide problems. Finally, a review of the literature on the application of the PML ABC to other numerical techniques of electromagnetics and to other partial differential equations of physics is provided. In addition, a software package for computing the actual reflection from a FDTD-PML is provided. It is available here.

Miss Matched

Miss Matched PDF
Author:
Publisher: Sherry Chamblee
ISBN:
Size: 77.30 MB
Format: PDF, Mobi
Category : Fiction
Languages : en
Pages : 111
View: 6137

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After her mother’s spectacular matchmaking failures, Natalie was sure her escapades were over. She should have known better. Nothing ever stopped Anne Scott in her search for a love for her only daughter, Natalie's opinions included. Now Anne has set her sights on another guy to be her future son-in-law. Poor Tyler…Natalie almost feels sorry for him. Almost. Her mother likes him, so Natalie is determined not to like anything about him. ~~~~~~~~~~~~~~~~~~~~~~~ Tyler has never met a girl so determined to dislike him in all his life. Thing is, he can't get her out of his mind, and that's never good. Will Natalie allow her mother to continue to dictate her life? Or will she finally give in to what God really wants? Thing is, maybe this time mother really does know best. This is a Christian romance short story, at about 25,000 words.

Royally Matched

Royally Matched PDF
Author: Emma Chase
Publisher: Emma Chase, LLC
ISBN: 0997426233
Size: 69.58 MB
Format: PDF
Category : Fiction
Languages : en
Pages :
View: 7084

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Matched Winners

Matched Winners PDF
Author: Sujit Mukerjee
Publisher: Orient Blackswan
ISBN: 9788125006688
Size: 75.56 MB
Format: PDF, ePub, Docs
Category : Cricket matches
Languages : en
Pages : 195
View: 5294

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This book is a spin-off of a series of articles, many of which have appeared in newspapers. Taking famous pairs of Indian Cricket (e.g. Gavaskar and Vishwanath, Bedi and Prasanna, Ashok Mankad and Surinder Amarnath), it sets off one career against another, balancing their test performance against their domestic record but never pronouncing a verdict on which career was better. Mukherjee s book is marked by impeccable research and sharp, critical observation.

Resonance And Aspect Matched Adaptive Radar

Resonance and Aspect Matched Adaptive Radar PDF
Author: Terence William Barrett
Publisher: World Scientific
ISBN: 9814329894
Size: 57.46 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 275
View: 870

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The book describes a new form of radar for which the target response is frequency, i.e., resonance-dependent. The book provides both prototype designs and empirical results collected from a variety of targets. The new form of radar, called RAMAR (Resonance and Aspect Matched Adaptive Radar) advances radar — mere ranging and detection — to the level of RF spectroscopy, and permits an advance of spectroscopic methods from optical, through infra-red and into the RF spectral range. The book will describe how a target's response can be a function of frequency components in the transmitted signal's envelope as well as the signal's carrier.