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  • 1
    Keywords: Shock waves -- Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (1103 pages)
    Edition: 1st ed.
    ISBN: 9781483291451
    Language: English
    Note: Front Cover -- Shock Compression of Condensed Matter - 1991 -- Copyright Page -- Table of Contents -- Preface -- Foreword -- Photograph: Recipient of the Shock Compression Science Award, 1991 -- CHAPTER I. PLENARY -- Shock Waves and Extreme States of Matter -- Progress in Understanding Shock Deformation in Condensed Materials at the Atomic/Molecular Level: Recent Experimental Developments -- Static Compression to Multimegabar Pressures -- CHAPTER II. EQUATION OF STATE -- Shock Compression of Condensed Matter up to Gigabar Pressure Range -- Quantum Mechanical Effects on the Shock Hugoniot -- The Calculated Behaviour of Periclase (MGO) at High Temperatures and Pressures -- Equation of State of Heated Glassy Carbon -- Shock-Vaporization Studies on Zinc and Porous Carbon -- Equation of State (EOS) and Bulk Modulus under Pressure of Noble Metals and Their Alloys -- Shock Compression of Iron -- Equation of State of Gold in the High-Temperature Low-Density Regime -- The Velocity of Sound Behind Strong Shocks in Si02 -- Equation of State of Composites under High Energy Densities -- Hugoniot Measurements on a Slurry of Finely Divided Tungsten and Plastic -- Equation of State and Crushing Dynamics of Low-Density Silica Aerogels -- Shock Compression of Low-Density Microcellular Materials -- Equation-of-State from Si02 Aerogel Hugoniot Data -- Shock Characterization of Epoxy-42 Volume Percent Glass Microballoons -- Two-Variable Feature of Gruneisen Function Observed in Experimental Porous Hugoniot Data -- Shock Wave Studies of Snow -- Energy Gap of Molecular Hydrogen from Electrical Conductivity Measurements -- CHAPTER III. MOLECULAR DYNAMICS AND MONTE CARLO SIMULATIONS -- Molecular Potentials for Simulating Shock-Induced Chemistry -- Simulations of Chemically-Sustained Shock Fronts in a Model Energetic Material. , Nonlinear Dynamics of Chains Interacting with a Steady Shock Front -- Direct Monte Carlo Simulation of Chemical Equilibrium Composition of Molecular Fluid Mixtures under Shock Conditions -- Monte Carlo Simulation of 3-Body Effects in Dense Helium -- Monte Carlo Calculations of the Properties of Solid Nitromethane -- Molecular Dynamics Simulations of Shocks in Imperfect Crystal Lattices -- Molecular Dynamics Simulation of Ejection Induced by Reflection of Shockwave at Free Surface of Metals -- CHAPTER IV. PHASE TRANSITIONS -- Band Structure Calculations to Predict Phase Transformations at High Pressures -- Lindemann Melting Law for Anisentropic Crystals: Graphite → Liquid Carbon -- Experimental Check of E. I. Zababahin Hypothesis Concerning Limitation of Energy Cumulation in the Spherically Converging Shock-Wave Front in the Medium with Phase Transitions -- Macrokinetics of α-ɛPhase Transition for Some Steels under Different Conditions of Explosive Loading -- Shock Induced Polymorphic Phase Transition in a Low-Alloy Steel -- Incubation Time and Growth Pattern of Martensite under a Short Duration Stress Pulse -- Shock-Induced Martensitic Transformation of Highly Ordered Graphite -- Melting along the Hugoniots of KBr and CsBr: Optical Pyrometry-Rarefaction Overtake Experiments -- Phase Transformation of AIN by Shock Compression -- Mechanism of the Shock-Induced Phase Transition in CdS Single Crystals -- Response of Single Crystal Calcite Shocked to 40 kbar along the C-Axis -- Microstructures of Shocked Quartz -- CHAPTER V. MODELING AND SIMULATION: NONENERGETIC MATERIALS -- Theoretical Prediction of Novel Molecular Solids Formed at High Pressure -- Theory of Spectroscopy of Point Defects in Solids: Cr lmpurities -- Effective Like- and Unlike-Pair Interactions at High Pressure and High Temperature -- Stability of Shock Waves. , Overdriven Shocks in Solids and Liquids -- Hydrodynamic Theory of Shock Induced Anomalous Mass Transfer in Solids -- Irregular Shock Refractions at a Material Interface -- One Dimensional Flows with Straight Particle Velocity Contours -- Non-Steady Wave Profiles and the Fourth-Power Law -- Energy Localization in Rapidly Deforming Crystalline Solids -- Modeling Shock Waves with Dislocation Mechanics Based Constitutive Relations -- Attenuation of Two-Dimensional Axisymmetric Shock Waves in Porous AI2O3 -- Simulation of Uniaxial Stress-Strain Curves for Arbitrary Strain Rates and Confining Stress Histories -- Reverse Plasticity Effects in Free Surface Wave Profiles -- Effects of Anisotropy on Dynamic Tensile Behavior -- Partially Decoupled Explosion Cavities -- Comparative Yield Estimation via Shock Hydrodynamic Methods -- The Size of Dents in Circular Shells Resulting from Submerged Shock Waves -- Hydrocode Development on the NCUBE and the Connection Machine Hypercubes -- TOLTEC: A Multidimensional Solid Dynamics Wavecode -- Interactive Mesh Generation in Solid Dynamics Hydrocodes -- ALE Shock Calculations Using a Stabilized Serendipity Rezoning Scheme -- Calculation of Elastic-Plastic Wave Propagation on the Connection Machine -- CHAPTER VI. MODELING AND SIMULATION: ENERGETIC MATERIALS -- The Structure of Detonation Waves in Solid Explosives -- Lagrangian Analysis, Data Covariance, and the Impulse Time Integral -- Analytical Representation of the Adiabatic Equation for Detonation Products Based on Statistical Mechanics and Intermolecular Forces -- Universal Description of Energetics of Condensed Matter -- The Influence of a Slow Rate on Detonation Flow -- A Study of the Impact of Reaction Rates on Equation of State -- Munroe/Channel Effect and Weak Detonations -- Shock and Shear Effects in Explosives due to Impact. , Shock Initiation of Pentaerythritol Tetranitrate Crystals: Steric Effects due to Plastic Flow -- Sensing the Threshold for Initiation of High Explosives in Hydrodynamic Calculations -- Expansion Movement and Fracture of a Cylindrical Shell due to Internal Explosion -- Interface Instabilities Occurring during an Explosive Driven Implosion -- Computational Studies of Sympathetic Detonation between Two Axially Adjacent, Cased Charges of H6 -- CHAPTER VII. MECHANICAL PROPERTIES: MACROSCOPIC ASPECTS -- Dynamic Plasticity in Transition from Thermal Activation to Viscous Drag -- Elastic-Plastic Constitutive Relations at Large Strain -- A New Model of Rate Dependent Elastic-Plastic Flow -- The Plastic Wave Myth -- Extrapolation of the Shear Modulus to High Compressions and Negative Pressures -- Appropriate Material Softening and Failure Models for Numerical Calculations -- Experimental Study of Spalling Strength and the Hydro-Elastic Viscoplastic Constitutive Equations with Damage -- Numerical Analysis of "Thin Film" Gruneisen Test Measurements -- Criteria of Transition from Translational to Rotational Motion of Media under Shock Loading -- Deformation Behavior of Pre-Shocked Copper as a Function of Strain Rate and Temperature -- Shear Stress Prediction in Shock Loaded Copper -- Dynamic Behavior of Fully Dense Molybdenum -- The Rate Dependence of the Saturation Flow Stress of Cu and 1100 Al -- Bauschinger Effect during Shock Loading -- Dynamic Behavior of Tungsten Sintered Alloys at High Strain Rates up to 105 s-1 -- Elastic-Plastic Behavior of Shock-Loaded Fe-SiO2 Composite Materials -- The Response of Ceramic Materials to Shock Loading -- Computer Studies of the Dynamic Strength of Ceramics -- The Failure Waves and Spallations in Homogeneous Brittle Materials -- Shock-Wave Properties of High-Strength Ceramics. , Elastic Wave Dispersion in High-Strength Ceramics -- Shock Compression of Chemically Bonded Ceramics -- Applying Steinberg's Model to the Hugoniot Elastic Limit of Porous Boron Carbide Specimens -- Shear Strength of Titanium Diboride under Shock Loading Measured by Transverse Manganin Gauges -- Spallation Behavior of TiB2,SiC, and B4C under Planar Impact Tensile Stresses -- Ceramics Behavior at Stress Levels Characteristic of Ballistic Impact -- Load/Unload Hysteresis in Ceramics Measured by a Reverberation Technique -- Effect of Shock-Re-Shock on Spallation of Titanium Diboride -- Mechanical Response of a Composite Propellant to Dynamic Loading -- Dynamic Compressive Properties of an Explosive Simulant -- Constitutive Modeling of Concrete under Impact Loading -- Effect of Strain Rate and Size on Tensile Strength of Concrete -- Dynamic Response of Moist Soil to Shock Loading -- Viscosity of Water and Glycerin behind a Shock Wave Front -- CHAPTER VIII. MECHANICAL PROPERTIES: MICROSCOPIC ASPECTS -- Plane Strain Fracture in Plate Impact -- The Influence of Tungsten-Atom Transition on the Mechanical Properties of Tungsten Alloys -- An Experimental Approach to Evolution of Spallation -- Microstructural Evolution in High Strain, High Strain-Rate Deformation -- Strain Rate Dependency of Copper Recrystallization -- The Acquisition and Investigation of Submicrocrystal Structure Materials in Experiments on Loading of Metal Spheres by Spherically Converging Shock Waves -- Influence of Twinning on the Elasto-Plastic Behavior of Armco-lron -- Homogeneous Deformation of a Particulate Reinforced Metal-Matrix Composite -- Linear Relation between Shock Velocity and Pressure in Relation to the Gruneisen Parameter -- A Micromechanical Model for Granular Material and Application to Penetration of Ceramic Armor. , Pressure Induced Macro- and Micromechanical Phenomena in Planar Impacted TiB2.
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  • 2
    Publication Date: 2022-05-09
    Description: IGMAS+ is a software for 3-D modelling of potential fields and its derivatives under the condition of constraining data and independent information. It comes with tools for forward and inverse modelling. IGMAS+ has a long history starting 1988 and has seen continuous improvement since then with input by many contributors.
    Language: English
    Type: info:eu-repo/semantics/other
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  • 3
    Publication Date: 2020-02-12
    Description: The Department 93 of the State Authority for Geology, Raw Materials and Mining (LGRB) Baden-Württemberghas the task of carrying out the systematic soil survey in Baden-Württemberg, Germany’s third-largest state insouthwest Germany. The results are used, for example, in the implementation of soil protection concerns in plan-ning (regional planning, urban land-use planning and large-scale projects such as long-distance traffic routes andpower lines), in water management (water framework regulations, discharge modelling), in agriculture (cross-compliance erosion, disadvantaged areas) and in nature conservation (biotope network). In current work processes,the information source satellite-based earth observation has only been used sporadically. Nowadays free high qual-ity multispectral imagery is available from space such as from the twin Sentinel-2 (S2) sensors providing widecoverage, minimum five-day global revisit-time at 10 to 20 m spatial scale, and improved spectral characteristicsthan previous multispectral satellites. The capabilities of the S2 sensors for soil assessment (soil organic carbon,soil texture) were recently demonstrated in local areas using ground databases for calibration (Gholizadeh et al.,Castaldi et al., 2018).In this study, we evaluate the potential of satellite data of the Copernicus Mission for the assessment of area-wide, high-resolution, near-surface soil parameters (e.g. organic carbon content, clay content, soil moisture, stonecontent, soil roughness) for the Baden-Württemberg region in southeastern Germany. In particular, this work isbased on the collaborative project BopaBW supported by the Copernicus-Services program in Germany and leadby the LGRB, Freiburg. BopaBW aims at the development of a data processing concept for the derivation of ad-ditional soil information for soil maps from Copernicus satellite imagery. The aim is to elaborate the relationshipsof near-surface soil parameter and their spectral characteristics by fusing the multispectral S2 data with analyzedsoil samples of arable and vine-growing areas in Baden-Wuerttemberg and hyperspectral field and laboratory spec-trometer measurements. For calibration and validation, extensive ground truth data from soil surveys includingchemical and physical soil properties and hyperspectral field measurements are available.One of the most important cornerstones in the use of Copernicus earth observation data is the operational andlong-term availability of physically homogeneous, high-quality data. The requirements on the products for the in-tegration into the official LGRB tasks have to be defined with regard to temporal and spatial availability, qualitystandards as well as processing levels for the creation of the data processing concept. The technical implementationof the overall concept is carried out during the project in an iterative process.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
    Publication Date: 2020-10-28
    Description: We introduce a new approach for 3D joint inversion of potential fields and its derivatives under the condition of constraining data and information. The interactive 3D gravity and magnetic application IGMAS (Interactive Gravity and Magnetic Application System) has been around for more than 30 years, initially developed on a mainframe and then transferred to the first DOS PCs, before it was adapted to Linux in the ’90s and finally implemented as a cross-platform Java application with GUI called IGMAS+. The software has proven to be very fast, accurate and easy to use once a model has been established. Since 2019 IGMAS+ has been maintained and developed in the Helmholtz Centre Potsdam – GFZ German Research Centre by the staff of Section 4.5 – Basin Modelling and ID2 – eScience Centre. The analytical solution of the volume integral for the gravity and magnetic effect of a homogeneous body is based on the reduction of the three-folded integral to an integral over the bounding polyhedrons (in IGMAS polyhedrons are built by triangles). Later the algorithm has been extended to cover all elements of the gravity tensor as well. Optimized storage enables very fast inversion of densities and changes to the model geometry and this flexibility makes geometry changes easy. The geometry is updated and the gravity is recalculated immediately after each change. Because of the triangular model structure, IGMAS can handle complex structures (multi Z surfaces) like the overhangs of salt domes very well. Geophysical investigations may cover huge areas of several thousand square kilometers but also models of Applied Geophysics at a meter scale. Due to the curvature of the Earth, the use of spherical geometries and calculations is necessary. The model technique is user-friendly because it is highly interactive, operates ideally in real-time whilst conserving topology and can be used for both flat (regional) and spherical models (global) in 3D. Modeling is constrained by seismic and structural input from independent data sources and is essential toward true integration of 3D thermal modeling or even Full Waveform Inversion. We are close to the demand for treating all geophysical methods in a single model of the subsurface and aim of fulfilling most of the constraints: measurements and geological plausibility. We demonstrate the flexibility of the software by modeling: (1) the southern segment of the Central Andes which is designed to assess the relationship between the characteristics of the overriding plate and the deformation and dynamics of the subduction system; (2) the South Caribbean margin which defines the two flat-slab subductions of the Nazca Plate and the Caribbean Plate, with variable mantle density distribution implemented by voxels; (3) the North Patagonian Massif Plateau in Argentina which provides insight into the main height differences between the plateau and the surroundings; and (4) an Alpine model which interrogates the strength of the lithosphere at different locations through the Alps and their forelands.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
    Publication Date: 2021-08-21
    Description: This volume contains the results of the DESERT project running from 2000 to 2006. It opens with a review paper (DESERT Group, 2009) followed by 33 special papers, see list of content (529 pages).
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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  • 6
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-06-27
    Description: Atmospheric predictability is fundamentally limited by the upscale growth of initial small-scale, small-amplitude errors. Studying upscale error growth mechanism is essential to better understand this fundamental limitation. Upscale error growth is frequently investigated by spectral analysis. By design, however, spectral analysis is non-local. A local investigation of error growth in different flow configurations is desirable, though, to study the well-known flow dependence of error growth.We take an approach complementary to spectral analysis and apply a feature-based perspective. We have developed an automated algorithm to identify error features in gridded data and track their spatial and temporal evolution. Errors are considered in terms of potential vorticity (PV) and near the tropopause, where they maximize. A previously derived PV-error tendency equation is evaluated to quantify the different contributions to error growth in previously published upscale error growth experiments with the global prediction Model ICON from the German Weather Service. Errors in these experiments grow from very small initial-condition uncertainty (three orders of magnitude smaller than current-day uncertainty) and due to differences in the seeding of a stochastic convection scheme.Evaluation of the process specific error growth rates allows the detailed quantification of the upscale growth mechanisms. For this purpose, we integrate the growth rates over the respective area associated with an error feature. Examination of the combined growth rates of all features reproduces the previously found three-phased multi-scale upscale growth paradigm. The growth rates from a single feature, however, can substantially differ from the mean picture.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 7
    Publication Date: 2023-07-28
    Description: Forward modeling in potential field data interpretation is a valuable tool for improving the significance of geophysical interpretations since decades. It allows for model validation and discrimination, parameter and depth estimations, and accommodation of complex subsurface structures, as well as topographic corrections in both Geophysics and Geodesy. Three tasks relevant to forward modelling are in our focus: “model validation” – testing accuracy and reliability of a geological model by comparing predicted/modelled data with field observations, “inversion optimization” – improvement of the accuracy of inversion results by incorporating constraints from forward modeling, and “sensitivity analysis” – evaluation of the sensitivity of the modeled data to changes in the model parameters, which can be used to make a more informed decision on the most likely underground model. While in the early days forward modeling was characterized using simple solids, such as spheres or rectangular prisms, to represent the subsurface structure, nowadays flexible polyhedra are available to deal with complicated subsurface structures for plane and spherical model calculations. Combined with modern computer graphics, interactive forward processing is possible “on the fly” and accompanied by the visualization of the broad spectrum of diverse model constraints. This enables an interdisciplinary “model discrimination” which assists in differentiating between multiple possible forward models by comparing the predicted data from each model with the observed data. Modeling case studies on small and large (global) scales will demonstrate these workflows by the aid of a software the team developed over the last decade.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 8
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-07-12
    Description: The next frontier in radiation science is to resolve cloud-aerosol-radiation interactions at the so-called process scale, which means at one kilometer or better – a significant advance from monitoring radiation at the 20 km footprint scale as done by the NASA’s Earth Observing System radiometers. Consequently, recent missions pursue a different radiation approach. Both EarthCARE and NASA’s AOS employ radiative transfer calculations that ingest imagery-based and active remote sensing products at their native resolution to calculate radiation fields. The imagery-scale calculations are then evaluated using independent radiance observations. In a process called radiance closure, discrepancies between calculations and observations for select observation angles and wavelength ranges are used to quantify and attribute errors, and perhaps even to nudge the remote sensing products towards higher fidelity. We will explain how this approach may address remote sensing biases of aerosol and cloud parameters for inhomogeneous scenes, which are fairly small at the 20 km scale, but can no longer be ignored at 1 km. Part of the solution will likely be convolutional neural networks, which are outgrowing the stigma to be merely qualitative tools without quantitative use for atmospheric remote sensing – to the point that they are now fueling the necessary transition from single-pixel to context-aware imagery retrieval algorithms. They are starting to outperform so-called physics-based algorithms when assessed through the lens of radiance closure. We will illustrate this with real-world examples, and lay out a vision for future cloud-aerosol-radiation interaction studies from aircraft and satellites.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 9
    Publication Date: 2023-07-31
    Description: Clouds are one of the less understood Earth's system components. In the Arctic, clouds play a fundamental role in many processes, and their characterization is crucial for the understanding of regional climate, ice melting, radiative budget, and related processes. Arctic cloud optical properties are measured from ground-based and space-borne instruments, but high surface reflectance values, a widespread condition at high latitudes but in general for snow and ice-covered regions, pose severe limitations to the application of many retrieval algorithms. These aspects have been investigated based on measurements made with a UV-VIS-NIR (300-950 nm wavelength range) spectrometer at the Thule High Arctic Atmospheric Observatory (76.5° N, 68.8° W, http://www.thuleatmos-it.it/) on the northwestern coast of Greenland. Continuous measurements are available for the 2022 season (March to September). In combination with radiation transfer simulations carried out with the libRadtran package, different retrieval algorithms for estimating the cloud optical thickness (COT) have been tested and compared. In addition to the spectral measurements, the information on the cloud base height provided by a ceilometer has been included to address the challenges posed by the high reflectance surfaces. Sensitivity studies on COT retrievals in different atmospheric and surface conditions will be presented, along with a case study.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 10
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-07-07
    Description: Cryosphere-related hazards are a growing but largely neglected threat for rural settlements, agrarian land use and local livelihoods in the cold-arid Trans-Himalaya. Despite the growing number of studies on cryosphere-related hazards, the occurrence, frequency and magnitude of glacial lake outburst floods (GLOFs) are almost entirely overlooked for the region of Ladakh. Due to the small size and high elevational location of glaciers above 5200 m a.s.l. also the glacial lakes are of small size. In the recent past several GLOF events occurred which destroyed infrastructure and agricultural area. It becomes obvious that even these small glacial lakes might be a permanent threat for local livelihoods and socioeconomic development. This is even more problematic as the number and size of lakes has significantly increased over the past decades. A comprehensive inventory of glacial lakes for the entire Trans-Himalayan region of Ladakh was carried out. This includes several almost permanently ice-covered high altitude lakes. Changes in the extent and number of glacial lakes have been quantified since 1969 in order to assess the potential threat of future GLOFs in the region. The lake development of selected former reported GLOF events and disappeared glacial lakes were analysed in detail to reconstruct lake level changes which possibly indicate earlier GLOF events. Based on high temporal resolution remote sensing data, a sophisticated monitoring concept needs to be realized to indicate the development of short-lived lakes on glaciers or on debris landforms with buried ice or fast glacial lake growth.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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