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Factorization methods for photonics and rough surfaces

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ISBN: 9783866442566 Year: Pages: VI, 156 p. DOI: 10.5445/KSP/1000008735 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Mathematics
Added to DOAB on : 2019-07-30 20:02:01
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This thesis investigates non-destructive testing problems for rough and periodic surfaces, where the task is to determine such structures from scattered waves. Such problems are non-linear and ill-posed. We are interested in the analysis of the Factorization method applied to this class of inverse scattering problems. This method does not attempt to solve a non-linear operator equation for the unknown object but computes a binary criterion characterizing points inside and outside the structure.

Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J‑PARC)

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ISBN: 9783038974833 / 9783038974840 Year: Pages: 162 DOI: 10.3390/books978-3-03897-484-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General) --- Mathematics
Added to DOAB on : 2019-02-06 09:44:25
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The Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC) is a landmark large user-facility producing neutron and muon beams. Those beams feed over 20 beamlines hosting world-class instruments for the investigation of matter across the disciplines of materials science, solid state physics and chemistry, biological and life sciences, geology, engineering, and their wider applications. Neutron and muons can probe matter in very peculiar ways. They are sensitive to magnetism and hydrogen atoms, can penetrate materials deeply or probe surfaces, and allow one to investigate the fundamental dynamics of the materials. In the past three to four decades, neutron scattering has largely contributed to the development of modern technology, such as computers, mobile phone technology, electo-chemistry, the transportation industry, and the pharmaceutic industry. MLF is a world leader in such characterization technology and serves yearly to about 700 research experiments conducted from users of 34 countries around the world. The present book describes technical details of the proton accelerator, the neutron spallation source, the muon facility, and all the beamlines with engineering realization, specifications, and relevant examples.

Diffraction and Scattering in Launchers of Quasi-Optical Mode Converters for Gyrotrons

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochleistungsimpuls- und Mikrowellentechnik ISSN: 21922764 ISBN: 9783866448223 Year: Volume: 2 Pages: IX, 142 p. DOI: 10.5445/KSP/1000026613 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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In this work different methods for the calculation of diffraction and scattering in launchers of quasi-optical mode converters for gyrotrons are compared, ranked and extended. The extension gives the opportunity to take a tapered average radius of the waveguide antenna into account. The comparison and the extension of the fast field calculation methods for component synthesis opens the possibility to reduce diffraction and stray radiation of reliable and powerful millimeter wave sources.

The factorization method for inverse scattering from periodic inhomogeneous media

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ISBN: 9783866445505 Year: Pages: X, 152 p. DOI: 10.5445/KSP/1000019400 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Mathematics
Added to DOAB on : 2019-07-30 20:01:59
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This book addresses the identification of the shape of penetrable periodic media by means of scattered time-harmonic waves. Mathematically, this is about the determination of the support of a function which occurs in the governing equations. Our theoretical analysis shows that this problem can be strictly solved for acoustic as well as for electromagnetic radiation by the so-called Factorization Method. We apply this method to reconstruct a couple of media from numerically simulated field data.

Molecular Magnetism of Lanthanides Complexes and Networks

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ISBN: 9783038429876 9783038429883 Year: Pages: VI, 110 Language: Englisch
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Biochemistry --- Biology --- Environmental Sciences
Added to DOAB on : 2018-08-20 16:50:33
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Over the last ten years a fresh air has been blowing in the field of molecular magnetism with the re-introduction of lanthanides ions as spin carriers in magnetic molecules. The strong magnetic moment and huge magnetic anisotropy of lanthanide ions has enabled significant breakthroughs in magnetic blocking temperature and related phenomena. The chemical versatility of these ions is also a strong asset as easy substitution among the lanthanides series enables isotropic, anisotropic or solid-solutions of magnetic molecules. Additionally, their outstanding luminescent properties are key features in rationalizing the single-molecule magnet (SMM) behavior and paving the way toward production of multifunctional materials. In this book, selected examples of research on molecular magnetism of lanthanides complexes and networks are presented illustrating the current dynamism of this research field.

Investigations of Angular Light Scattering by Complex Atmospheric Particles

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ISBN: 9783731505549 Year: Pages: XVI, 230 p. DOI: 10.5445/KSP/1000056601 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Astronomy (General)
Added to DOAB on : 2019-07-30 20:01:57
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This book experimentally investigates the angular light scattering properties of three atmospherically relevant particles: ice crystals, dust particles and secondary organic aerosol particles. Key optical quantities under examination are the near-backscattering depolarisation properties and the angular light scattering function. The main question is how these parameters are related to the particle microphysical properties, such as particle size and complexity.

Outstanding Topics in Ocean Optics

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ISBN: 9783038977049 9783038977056 Year: Pages: 454 DOI: 10.3390/books978-3-03897-705-6 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Oceanography
Added to DOAB on : 2019-04-25 16:37:17
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Ocean optics is a branch of oceanography which is firmly embedded in studies of a great variety of ocean science and engineering questions. The interactive nature between radiative transfer of light and various dissolved and particulate constituents of seawater is at the core of ocean optics science and applications. The transfer of radiant solar energy has vital implications to life and climate on Earth, and the large variety of subjects of ocean optics ranges from the subtle problems of physical optics to optical remote sensing towards a better understanding of ocean biology, biogeochemistry and ecosystems and their roles in the Earth's system processes. The intention of this book is to present a collection of papers that generally share a common denominator of frontier topics in ocean optics which are unique, uncommon or outstanding in the literature, and to provide a balanced view of the extraordinary breadth of research in this field. Topics as diverse as measurements and modeling of radiative transfer, light fields, light scattering and polarization, ocean color, benthic optical properties, and the use of optics for characterizing seawater constituents are addressed in this book. The book is expected to be of interest and useful to a broad audience of professional ocean scientists, engineers and advanced students with an interest in ocean optics and applications of optical methods in oceanography.

Keywords

forward modeling --- suspended matter --- marine particles --- fractal structure --- organic carbon --- chlorophyll-a --- oceanic light field --- irradiance quartet --- apparent optical properties --- inelastic processes --- Gershun equation --- ocean euphotic zone --- phytoplankton pigments --- ocean color --- remote sensing --- MERIS --- global oceans --- light scattering --- light scattering by pure water --- light scattering by pure seawater --- anomalous properties of water --- remote-sensing reflectance --- bathymetry --- hyperspectral --- bottom mapping --- radiative transfer --- apparent optical properties --- 3D Monte Carlo numerical simulations --- downward irradiance --- upward radiance --- sea ice heterogeneity --- vertical attenuation coefficient --- melt ponds --- remote sensing --- coral reef --- sensor noise --- retrieval uncertainty --- particle dynamics --- optical properties --- suspended sediment --- phytoplankton --- PFT --- ocean colour --- satellite radiometry --- radiative transfer --- optical modelling --- vector radiative transfer --- polarization --- coupled systems --- atmosphere --- ocean --- forward modeling --- inverse problems --- marine optics --- inherent optical properties --- volume scattering function --- degree of linear polarization --- marine particles --- light scattering measurements --- LISST-VSF instrument --- ocean optics --- ocean color --- remote sensing --- radiative transfer approximation --- volume scattering function --- NASA PACE mission --- polarization --- ocean optics --- upwelling radiance distribution --- remote sensing --- remote sensing --- hyperspectral --- shallow water --- coral --- derivative --- radiative transfer --- canopy --- ocean color database --- oceanic carbon --- chromophoric dissolved organic matter --- dissolved organic carbon --- CDOM spectral slope --- ocean color remote sensing --- algorithm development --- ocean color algorithm validation --- ocean optics --- CDOM climatology --- CDOM and ENSO --- machine learning --- ocean optics --- backscattering ratio --- phytoplankton --- coated-sphere model --- bulk refractive index --- seawater component --- natural organic matter --- DOM --- FDOM --- CDOM --- Gelbstoff --- EEMS --- PARAFAC --- marine sensors --- Kallemeter --- FerryBox --- Trondheimsfjord --- Norway --- ocean optics --- light scattering --- Mueller matrix --- volume and surface integral methods

Metals Challenged by Neutron and Synchrotron Radiation

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ISBN: 9783038426790 9783038426806 Year: Pages: 288 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Mining and Metallurgy
Added to DOAB on : 2018-02-08 13:10:36
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Neutron and Synchrotron radiation methods have matured to become powerful techniques for the study of a vast range of materials, including metals. The characterization methods comprise the categories of diffraction, spectroscopy and imaging, which themselves can alter greatly in detail, to include hundreds of variants, problems and sample environments. In a similar way, their applications to metals and hard condensed matter materials cover disciplines spanning engineering, physics, chemistry, materials science and their derivatives such as geology, energy storage, etc. … The present book, “Metals Challenged by Neutron and Synchrotron Radiation” is a first compilation in Metals of 20 original and review works on research utilizing or designing those state-of-the-art techniques at modern facilities. The Editorial reviews the context of and identifies thematic links between these papers, grouping them into five interwoven themes, namely Sintering Techniques and Microstructure Evolution, Titanium Aluminides and Titanium Alloys Under Extreme Conditions, Metallic Glass and Disordered Crystals, In Situ and Time-Resolved Response to Mechanical Load and Shock, and Thin Films and Layers. This book represents a good cross-section of the status quo of neutron and synchrotron radiation with respect to questions in the metallurgical field, which by far is not exhaustive. Nor are the methods and other materials, which motivated me to the creation of a new sister-journal, entitled Quantum Beam Science. With this, I would like to thank all authors, reviewers and contributors behind the scene for the creation of this work, presenting to you a piece of interesting reading and reference literature.

Phase-Contrast and Dark-Field Imaging

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ISBN: 9783038972846 / 9783038972853 Year: Pages: 146 DOI: 10.3390/books978-3-03897-285-3 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Physics (General) --- Mathematics
Added to DOAB on : 2019-01-08 11:33:34
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The intent of this Special Issue is to provide a framework with which scientists in several different disciplines, related to phase-contrast and dark-field imaging, can illustrate their ideas and results. The articles are reviews or very recent scientific reports; they address newcomers in the field, as well as experts and professors in fields of X-ray physics, electron, and phase-contrast X-ray imaging.

Advanced Synchrotron Radiation Techniques for Nanostructured Materials

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ISBN: 9783039216802 / 9783039216819 Year: Pages: 138 DOI: 10.3390/books978-3-03921-681-9 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Mathematics --- Science (General)
Added to DOAB on : 2019-12-09 11:49:16
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Nanostructured materials exploit physical phenomena and mechanisms that cannot be derived by simply scaling down the associated bulk structures and phenomena; furthermore, new quantum effects come into play in nanosystems. The exploitation of these emerging nanoscale interactions prompts the innovative design of nanomaterials. Understanding the behavior of materials on all length scales—from the nanostructure up to the macroscopic response—is a critical challenge for materials science. Modern analytical technologies based on synchrotron radiation (SR) allow for the non-destructive investigation of the chemical, electronic, and magnetic structure of materials in any environment. SR facilities have developed revolutionary new ideas and experimental setups for characterizing nanomaterials, involving spectroscopy, diffraction, scatterings, microscopy, tomography, and all kinds of highly sophisticated combinations of such investigation techniques. This book is a collection of contributions addressing several aspects of synchrotron radiation as applied to the investigation of chemical, electronic, and magnetic structure of nanostructured materials. The results reported here provide not only an interesting and multidisciplinary overview of the chemicophysical investigations of nanostructured materials carried out by state-of-the-art SR-induced techniques, but also an exciting glance into the future perspectives of nanomaterial characterization methods.

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