5,110 Works

Stochastic cosmological inflation

Florian Kühnel

[Neue Nr. 6418] Birkenau/ Geologische Karte

G. Klemm
Geologische Karte 1: 25 000 mit Erläuterungen. Digitalisat des FID GEO (Fachinformationsdienst Geowissenschaften der festen Erde), erstellt durch das GDZ (Göttinger Digitalisierungszentrum), Karte aus dem Bestand der SUB Göttingen. Koordinaten Vorlage: E 008 40 - E 008 50 / N 049 36 - N 049 30

Current flood risk management practices in Ghana: Gaps and opportunities for improving resilience

Adrian Almoradie, Mariana Madruga De Brito, Mariele Evers, Aymar Bossa, Mawuli Lumor, Charlotte Norman, Yira Yacouba & Jean Hounkpe
This article evaluates the current gaps and describes opportunities for improving flood risk management (FRM) in Ghana, West Africa. A mixed-method participatory approach comprising questionnaires, workshops, interviews with key stakeholders, and a systematic literature review were employed. Existing problems, discourses, FRM practices, and opportunities to enhance flood resilience were identified. They provided the basis for outlining potential research directions into ways of tracking these challenges. The results show how different actors perceive FRM in Ghana....

Crystallization of metastable monoclinic carnallite, KCl·MgCl2·6H2O: missing structural link in the carnallite family

Melanie Pannach, Iris Paschke, Horst Schmidt, Daniela Freyer & Wolfgang Voigt
During evaporation of natural and synthetic K–Mg–Cl brines, the formation of almost square plate-like crystals of potassium carnallite (potassium chloride magnesium dichloride hexahydrate) was observed. A single-crystal structure analysis revealed a monoclinic cell [a = 9.251 (2), b = 9.516 (2), c = 13.217 (4) Å, β = 90.06 (2)° and space group C2/c]. The structure is isomorphous with other carnallite-type compounds, such as NH4Cl·MgCl2·6H2O. Until now, natural and synthetic carnallite, KCl·MgCl2·6H2O, was only known...

Geologische Specialkarte des Grossherzogthums Hessen und der angrenzenden Landesgebiete im Maassstabe von 1: 50000 / Mittelrheinischer Geologischer Verein: Section Herbstein-Fulda

Hans Tasche & Wilhelm Carl Julius Gutberlet
Geologische Karte 1: 50 000 mit Erläuterungen. Section Herbstein der Karte des Grossherzogtums Hessen General-Quartier-meister Stabs, Section Neuhof der topographischen Karte des Kurfürstenthum Hessen. Digitalisat des FID GEO (Fachinformationsdienst Geowissenschaften der festen Erde), erstellt durch das GDZ (Göttinger Digitalisierungszentrum), Karte aus dem Bestand der SUB Göttingen. Koordinaten Vorlage: Nullmeridian Ferro E 27 00 - E 27 20 N 50 36 - N 50 24

Geologische Specialkarte des Grossherzogthums Hessen und der angrenzenden Landesgebiete im Maassstabe von 1: 50000 / Mittelrheinischer Geologischer Verein: Section Dieburg (Darmstadt)

F. Becker & Rudolf Ludwig
Geologische Karte 1: 50 000 mit Erläuterungen. Section Dieburg (Darmstadt) der topographischen Karte des Kurfürstenthum Hessen. Digitalisat des FID GEO (Fachinformationsdienst Geowissenschaften der festen Erde), erstellt durch das GDZ (Göttinger Digitalisierungszentrum), Karte aus dem Bestand der SUB Göttingen. Koordinaten Vorlage: Nullmeridian Ferro E 26 20 - E 26 40 N 50 00 - N 49 48

Geologische Specialkarte des Grossherzogthums Hessen und der angrenzenden Landesgebiete im Maassstabe von 1: 50000 / Mittelrheinischer Geologischer Verein:Section Friedberg

Rudolf Ludwig
Geologische Karte 1: 50 000 mit Erläuterungen. Section Friedberg der topographischen Karte des Kurfürstenthum Hessen. Digitalisat des FID GEO (Fachinformationsdienst Geowissenschaften der festen Erde), erstellt durch das GDZ (Göttinger Digitalisierungszentrum), Karte aus dem Bestand der SUB Göttingen. Koordinaten Vorlage: Nullmeridian Ferro E 26 20 - E 26 40 N 50 24 - N 50 12

Geologische Specialkarte des Grossherzogthums Hessen und der angrenzenden Landesgebiete im Maassstabe von 1: 50000 / Mittelrheinischer Geologischer Verein: Section Alzey

Rudolf Ludwig
Geologische Karte 1: 50 000 mit Erläuterungen. Section Alzey der topographischen Karte des Kurfürstenthum Hessen. Digitalisat des FID GEO (Fachinformationsdienst Geowissenschaften der festen Erde), erstellt durch das GDZ (Göttinger Digitalisierungszentrum), Karte aus dem Bestand der SUB Göttingen. Koordinaten Vorlage: Nullmeridian Ferro E 26 40 - E 27 00 N 50 48 - N 50 36

Geologische Specialkarte des Grossherzogthums Hessen und der angrenzenden Landesgebiete im Maassstabe von 1: 50000 / Mittelrheinischer Geologischer Verein: Section Alsfeld

Rudolf Ludwig
Geologische Karte 1: 50 000 mit Erläuterungen. Section Alsfeld der topographischen Karte des Kurfürstenthum Hessen. Digitalisat des FID GEO (Fachinformationsdienst Geowissenschaften der festen Erde), erstellt durch das GDZ (Göttinger Digitalisierungszentrum), Karte aus dem Bestand der SUB Göttingen. Koordinaten Vorlage: Nullmeridian Ferro E 27 40 - E 27 60 N 50 48 - N 36

Flow Resistance and Energy Dissipation in Supercritical Air-Water Flows Down Vegetated Chutes

B. Scheres, H. Schüttrumpf & S. Felder
Abstract Vegetation covers on dikes and embankment dams have proven as sustainable and cost-effective surface protection against external erosion caused by hydraulic, mechanical, or climatic impacts. Determination of the hydraulic loads that act upon these covers requires the knowledge of the flow resistance. While the high-velocity flows on vegetated slopes are often aerated, the flow aeration has rarely been considered, and no direct measurements of the air-water flow properties have been conducted to date. The...

Nutrient regulation of late spring phytoplankton blooms in the midlatitude North Atlantic

Thomas J. Browning, Ali A. Al-Hashem, Mark J. Hopwood, Anja Engel, Ewan D. Wakefield & Eric P. Achterberg
The duration and magnitude of the North Atlantic spring bloom impacts both higher trophic levels and oceanic carbon sequestration. Nutrient exhaustion offers a general explanation for bloom termination, but detail on which nutrients and their relative influence on phytoplankton productivity, community structure, and physiology is lacking. Here, we address this using nutrient addition bioassay experiments conducted across the midlatitude North Atlantic in June 2017 (late spring). In four out of six experiments, phytoplankton accumulated over...

Fluid–rock interactions in the shallow Mariana forearc: carbon cycling and redox conditions

Elmar Albers, Wolfgang Bach, Frieder Klein, Catriona D. Menzies, Friedrich Lucassen & Damon A. H. Teagle
Few data exist that provide insight into pro- cesses affecting the long-term carbon cycle at shallow fore- arc depths. To better understand the mobilization of C in sediments and crust of the subducting slab, we investigated carbonate materials that originate from the subduction chan- nel at the Mariana forearc (< 20 km) and were recovered during International Ocean Discovery Program Expedition 366. Calcium carbonates occur as vein precipitates within metavolcanic and metasedimentary clasts. The clasts...

Modeling Fluid Reinjection Into an Enhanced Geothermal System

Francesco Parisio & Keita Yoshioka
Abstract The manuscript analyzes the stimulation for an Enhanced Geothermal System development in Acoculco, Mexico. Using an analytical penny-shaped hydraulic fracture model covering different propagation regimes, we computed the final fracture length and width by varying fluid properties with temperature. Our analysis indicates that for the given scenario, the fluid viscosity plays a minor role and instead flow rate and time of the stimulation are the controlling variables. We computed the fracture reopening as a...

A Critical Evaluation of Deep Blue Algorithm Derived AVHRR Aerosol Product Over China

Linlu Mei, Chuanxu Zhao, Gerrit De Leeuw, John P. Burrows, Vladimir Rozanov, HuiZheng Che, Marco Vountas, Annette Ladstätter-Weißenmayer & Xiaoye Zhang
The Deep Blue (DB) aerosol retrieval algorithm has recently been applied to Advanced Very High Resolution Radiometer (AVHRR) data to produce a first version (V001) of a global aerosol optical thickness (AOT) data set. In this paper, we critically evaluate these AVHRR AOT data over China by comparison with ground-based reference data from China Aerosol Remote Sensing Network for the period 2006–2011. The evaluation considers the impact of the surface (type and reflectance) and the...

Turritelline mass accumulations from the Lower Miocene of southern Germany: implications for tidal currents and nutrient transport within the North Alpine Foreland Basin

James H. Nebelsick, Michael Rasser, Olaf Höltke, Jeffrey R. Thompson & Ulrich Bieg
The mass occurrence of turritelline gastropod shells from the Lower Miocene of southern Germany allows for detailed studies of their palaeoecology, transport mechanisms, preservation potentials and the reconstruction of nutrient regimes. Changes in the fabric of the gastropod‐dominated beds are used to reconstruct a generally deepening environment corresponding to the Lower Miocene transgression within the Upper Molasse Sea of the North Alpine Foreland Basin. The sedimentary succession ranges from chaotically arranged, densely packed and near‐shore...

XGANDALF – extended gradient descent algorithm for lattice finding

Yaroslav Gevorkov, Oleksandr Yefanov, Anton Barty, Thomas A. White, Valerio Mariani, Wolfgang Brehm, Aleksandra Tolstikova, Rolf-Rainer Grigat & Henry N. Chapman
Serial crystallography records still diffraction patterns from single, randomly oriented crystals, then merges data from hundreds or thousands of them to form a complete data set. To process the data, the diffraction patterns must first be indexed, equivalent to determining the orientation of each crystal. A novel automatic indexing algorithm is presented, which in tests usually gives significantly higher indexing rates than alternative programs currently available for this task. The algorithm does not require prior...

Concepts for nondestructive and depth‐resolved X‐ray residual stress analysis in the near‐surface region of nearly single crystalline materials with mosaic structure

Andreas Hollmann, Matthias Meixner, Manuela Klaus & Christoph Genzel
Two evaluation concepts for nondestructive depth‐resolved X‐ray residual stress analysis in the near‐surface region of materials with cubic symmetry and nearly single crystalline structure are introduced by simulated examples. Both concepts are based on the same data acquisition strategy, which consists in the determination of lattice‐spacing depth profiles along the ⟨hkl⟩ poles by stepwise sample rotation around the scattering vector. Segmentation of these profiles parallel to the sample surface provides the lattice strain state as...

Elastic stiffness coefficients of thiourea from thermal diffuse scattering

Julia Büscher, Alessandro Mirone, Michał Stękiel, Dominik Spahr, Wolfgang Morgenroth, Eiken Haussühl, Victor Milman, Alexei Bosak, Oleh Ivashko, Martin Von Zimmermann, Ann-Christin Dippel & Björn Winkler
The complete elastic stiffness tensor of thiourea has been determined from thermal diffuse scattering (TDS) using high‐energy photons (100 keV). Comparison with earlier data confirms a very good agreement of the tensor coefficients. In contrast with established methods to obtain elastic stiffness coefficients (e.g. Brillouin spectroscopy, inelastic X‐ray or neutron scattering, ultrasound spectroscopy), their determination from TDS is faster, does not require large samples or intricate sample preparation, and is applicable to opaque crystals. Using...

Facilitated crystal handling using a simple device for evaporation reduction in microtiter plates

Tatjana Barthel, Franziska U. Huschmann, Dirk Wallacher, Christian G. Feiler, Gerhard Klebe, Manfred S. Weiss & Jan Wollenhaupt
In the past two decades, most of the steps in a macromolecular crystallography experiment have undergone tremendous development with respect to speed, feasibility and increase of throughput. The part of the experimental workflow that is still a bottleneck, despite significant efforts, involves the manipulation and harvesting of the crystals for the diffraction experiment. Here, a novel low‐cost device is presented that functions as a cover for 96‐well crystallization plates. This device enables access to the...

Delamination Detection on a Concrete Bridge Deck Using Fast Scanning Impact Echo

Johannes Fritz Scherr & Christian Ulrich Grosse
poster

About possible geophysical causes of the decade fluctuations in the length of day

Hans Greiner-Mai
report

Implementierung und Bewertung einer auf statistischen Momenten basierenden Methode zur automatischen Bestimmung der Einsatzzeiten von P- und S-Phasen

Niklas Kühne, Olaf Hellwig & Stefan Buske
Für die automatische Detektion von Erdbebenphasen in seismologischen Daten haben sich STA/LTA-Picker bewährt. In dieser Arbeit stellen wir einen alternativen Ansatz vor, der die statistischen Eigenschaften des aufgezeichneten Signals nutzt. Dafür wird die Verteilungsfunktion der gemessenen Amplituden in einem gleitenden Zeitfenster über zentrale Momente beschrieben. Insbesondere das zentrale Moment 4. Ordnung, die Wölbung oder Kurtosis, ist sensitiv gegenüber Abweichungen von der Normalverteilung. Da die Kurtosis zunimmt, sobald das Zeitfenster den Beginn einer Erdbebenphase beinhaltet, scheint...

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