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Seismic Wave Propagation in Stratified Media

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ISBN: 9781921536731 Year: Pages: 288 DOI: 10.26530/OAPEN_459524 Language: English
Publisher: ANU Press
Subject: Geology --- Earth Sciences
Added to DOAB on : 2012-06-14 11:46:24
License: ANU Press

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Seismic Wave Propagation in Stratified Media presents a systematic treatment of the interaction of seismic waves with Earth structure. The theoretical development is physically based and is closely tied to the nature of the seismograms observed across a wide range of distance scales – from a few kilometres as in shallow reflection work for geophysical prospecting, to many thousands of kilometres for major earthquakes. A unified framework is presented for all classes of seismic phenomena, for both body waves and surface waves. Since its first publication in 1983 this book has been an important resource for understanding the way in which seismic waves can be understood in terms of reflection and transmission properties of Earth models, and how complete theoretical seismograms can be calculated. The methods allow the development of specific approximations that allow concentration on different seismic arrivals and hence provide a direct tie to seismic observations.

One Hundred Years of General Relativity:From Genesis and Empirical Foundations to Gravitational Waves, Cosmology and Quantum Gravity

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ISBN: 9789814635134 Year: Volume: 1 Pages: 720 DOI: 10.1142/9389-vol1 Language: ENGLISH
Publisher: World Scientific Publishing Co.
Added to DOAB on : 2019-07-04 08:59:32

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The aim of this two-volume title is to give a comprehensive review of one hundred years of development of general relativity and its scientific influences. This unique title provides a broad introduction and review to the fascinating and profound subject of general relativity, its historical development, its important theoretical consequences, gravitational wave detection and applications to astrophysics and cosmology. The series focuses on five aspects of the theory:Genesis, Solutions and EnergyEmpirical FoundationsGravitational WavesCosmologyQuantum GravityThe first three topics are covered in Volume 1 and the remaining two are covered in Volume 2. While this is a two-volume title, it is designed so that each volume can be a standalone reference volume for the related topic.

One Hundred Years of General Relativity:From Genesis and Empirical Foundations to Gravitational Waves, Cosmology and Quantum Gravity

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ISBN: 9789814678506 Year: Volume: 2 Pages: 636 DOI: 10.1142/9389-vol2 Language: ENGLISH
Publisher: World Scientific Publishing Co.
Added to DOAB on : 2019-07-04 09:01:47

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The aim of this two-volume title is to give a comprehensive review of one hundred years of development of general relativity and its scientific influences. This unique title provides a broad introduction and review to the fascinating and profound subject of general relativity, its historical development, its important theoretical consequences, gravitational wave detection and applications to astrophysics and cosmology. The series focuses on five aspects of the theory:Genesis, Solutions and EnergyEmpirical FoundationsGravitational WavesCosmologyQuantum GravityThe first three topics are covered in Volume 1 and the remaining two are covered in Volume 2. While this is a two-volume title, it is designed so that each volume can be a standalone reference volume for the related topic.

Time-efficient Simulation of Surface-excited Guided Lamb Wave Propagation in Composites

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Book Series: Schriftenreihe des Instituts für Technische Mechanik, Karlsruher Institut für Technologie ISSN: 16143914 ISBN: 9783866449350 Year: Volume: 18 Pages: X, 202 p. DOI: 10.5445/KSP/1000030760 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:02:01
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The methods of time-efficient simulation of surface-excited wave propagation in plate-like multilayered composites are presented. The mathematical model of wave propagation in laminated plate based on the elasticity theory is transformed and then solved in wavenumber-frequency domain. The numerical methods for computation of inverse transform in time-space domain are developed and used for analysis of wave and energy propagation phenomena occurring in composite plates due to surface excitation.

Sleep Spindles: Breaking the Methodological Wall

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889451166 Year: Pages: 228 DOI: 10.3389/978-2-88945-116-6 Language: English
Publisher: Frontiers Media SA
Subject: Neurology --- Science (General)
Added to DOAB on : 2017-07-06 13:27:36
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In the last decade, sleep spindles have attracted steadily increasing attention. This interest is motivated by the many intriguing relationships between spindles and various diseases (e.g., schizophrenia, Parkinson, Alzheimer, autism, mental retardation), recovery processes (e.g., post brain stroke), and cognitive faculties (e.g., memory consolidation, intelligence, dream recall, sleep preservation). Nonetheless, a methodological wall has impeded the study of sleep spindles. Their investigation rests heavily on our ability to reliably and consistently identify spindle patterns from background EEG activity, a task involving many obstacles, including: a fuzzy definition of spindles, low inter-expert agreement on their scoring, lack of consensus on standard techniques for their automated detection, low reproducibility of observed characteristics and correlates, unavailability of large, standardized, high-quality databases, and inconsistencies in the methods used to evaluate the performance of automated detectors. The primary aims of this research topic were to bring together world-class researchers on a project designed to facilitate exchanges on methodological difficulties encountered in assessing sleep spindles and to promote standardized spindle-related resources. In preparing their contributions, authors were encouraged to use existing – or to propose new – publicly available resources for assessing sleep spindles. To allow fair and accurate comparison of reported results, the authors were also encouraged to validate their tools on a common benchmark. A database containing expert spindle scoring (i.e., the Montreal Archive of Sleep Studies) was made publicly available for that purpose.

Women’s Activism and "Second Wave" Feminism

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ISBN: 9781474250511 9781474250535 9781474250528 Year: Language: English
Publisher: Bloomsbury Academic Grant: Knowledge Unlatched - 102560
Subject: Gender Studies
Added to DOAB on : 2019-03-08 11:21:03
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Women’s Activism and "Second Wave" Feminism situates late 20th century feminisms within a global framework of women’s activism. Its chapters, written by leading international scholars, demonstrate how issues of heterogeneity, transnationalism, and intersectionality have transformed understandings of historical feminism. It is no longer possible to imagine that feminism has ever fostered an unproblematic sisterhood among women blind to race, ethnicity, class, sexuality, nationality and citizenship status. The chapters in this collection modify the "wave" metaphor in some cases and in others re-periodize it. By studying individual movements, they collectively address several themes that advance our understandings of the history of feminism, such as the rejection of "hegemonic" feminism by marginalized feminist groups, transnational linkages among women’s organizations, transnational flows of ideas and transnational migration.

Surface wave driven molecular low pressure plasmas for general lighting

Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731504641 Year: Volume: 10 Pages: X, 282 p. DOI: 10.5445/KSP/1000051323 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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Nowadays, compact fluorescent lamps are widely-used in general lighting applications. However, they still struggle with acceptance problems due to the hazardous mercury, which serves as the radiant component inside the lamp. The presented work deals with the development of a mercury-free, electrodeless, low pressure plasma based on a molecular filling and driven by microwaves, which may represent a viable alternative to the conventional CFLs.

Time-dependent spectrum analysis of high power gyrotrons

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochleistungsimpuls- und Mikrowellentechnik ISSN: 21922764 ISBN: 9783731503750 Year: Volume: 6 Pages: XIV, 286 p. DOI: 10.5445/KSP/1000046919 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:00
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In this work, a novel measurement system for the analysis of the gyrotron RF output spectrum was developed. It enables unprecedented time dependent measurements within a large bandwidth, dynamic range and unambiguous RF indication in the entire D-Band (110-170 GHz). Special attention was given to the investigation of parasitic RF oscillations, and the analysis of the interplay of thermal cavity expansion and ionization-based space charge neutralization at the start of long RF pulses.

Ultrasonic Guided Waves

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ISBN: 9783039282982 9783039282999 Year: Pages: 376 DOI: 10.3390/books978-3-03928-299-9 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-04-07 23:07:09
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The propagation of ultrasonic guided waves in solids is an important area of scientific inquiry, primarily due to their practical applications for nondestructive characterization of materials, such as nondestructive inspection, quality assurance testing, structural health monitoring, and providing a material state awareness. This Special Issue of Applied Sciences covers all aspects of ultrasonic guided waves (e.g., phased array transducers, meta-materials to control wave propagation characteristics, scattering, attenuation, and signal processing techniques) from the perspective of modeling, simulation, laboratory experiments, or field testing. In order to fully utilize ultrasonic guided waves for these applications, it is necessary to have a firm grasp of their requisite characteristics, which include that they are multimodal, dispersive, and are comprised of unique displacement profiles through the thickness of the waveguide.

Keywords

electromagnetic wave --- group velocity --- time-frequency domain reflectometry --- dispersive medium --- ultrasonic guided wave --- nondestructive testing --- square steel bar --- non-detection zone --- surface flaw --- Rayleigh wave --- scattering --- modified BEM --- reconstruction --- adhesive joint --- single lap joint --- non-destructive testing --- damage identification --- Lamb waves --- scanning laser vibrometry --- signal processing --- ultrasonic guided waves --- axial transmission --- ultrasonic guided waves --- fiber optics --- fiber Bragg grating --- nondestructive testing --- structural health monitoring --- pipe inspection --- partial wave method --- slowness curves --- lamb wave --- stoneley wave --- mode sorting --- acoustic leakage --- rayleigh wave --- surface waves --- elastodynamics --- guided waves --- lamb wave --- dispersion curves --- phase velocity --- group velocity --- signal processing --- SH0 mode --- circumferential scanning --- synthetic aperture focusing --- exploding reflector model --- Lamb wave --- local wavenumber --- air-coupled transducer --- wavenumber domain filtering --- hybrid and non-contact system --- signal processing --- SNR --- split-spectrum processing --- ultrasonic guided waves --- signal processing --- defect detection --- spatial domain --- array analysis --- pipeline inspection --- ultrasonic guided waves (UGWs) --- metamaterial --- resonator --- low-frequency --- lamb wave --- adaptive filtering --- leaky normalized mean square --- ultrasonic guided waves --- pipeline inspection --- SNR enhancement --- signal processing --- guided wave --- multi-wire cable --- wave structure --- contact acoustic nonlinearity --- energy transfer --- rail --- ultrasonic guided wave --- semi-analytical finite element --- single mode extraction algorithm --- defect location --- signal processing --- defect detection --- torsional wave --- power spectrum --- sliding window --- pipeline inspection --- ultrasonic guided-waves (UGWs) --- magnetostrictive patch transducer --- shear mode --- soft magnetic patch --- dynamic magnetic field optimization --- signal strength enhancement --- acoustic emission --- nondestructive testing --- leakage location --- fault diagnosis --- n/a --- lamb waves --- composite --- ultrasonic testing --- numerical modelling --- pressure vessels

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