496,454 Works

Dataset of hydraulic aperture and effluent element concentrations over time

Renchao Lu
Numerical results presented in the article "Numerical results presented in the paper "Modelling of dissolution-induced permeability evolution of a granite fracture under crustal conditions"

File name: 1D_model_time_outflow_1.csv
Presented in Figure 6 and Figure 7
Initial contact area ratio Rc0: 1.95%;
Initial mean mechanical aperture bm0: 9.12082 micro;

Dataset of hydraulic aperture and effluent element concentrations over time

Renchao Lu
Numerical results presented in the article "Numerical results presented in the paper "Modelling of dissolution-induced permeability evolution of a granite fracture under crustal conditions"

File name: 1D_model_time_outflow_1.csv
Presented in Figure 6 and Figure 7
Initial contact area ratio Rc0: 1.95%;
Initial mean mechanical aperture bm0: 9.12082 micro;

Results of genie3 analyis for wheat

Andrea Bräutigam
This file contains the detailed results of the genie3 analysis for wheat gene expression networks. The result of the genie3 network construction are stored in a R data object containing a matrix with target genes in columns and transcription factor genes in rows. One folder provides GO term enrichments of the biological process category for each transcription factor. A second folder provides all transcription factors associated with each GO term.

Photos from Inter-generational Workshop

Nicola Abraham
Photos from Inter-generational Workshop.

Photos from Inter-generational Workshop

Nicola Abraham
Photos from Inter-generational Workshop.

Non-Abelian sigma models from Yang–Mills theory compactified on a circle

T.A. Ivanova, O. Lechtenfeld & A.D. Popov
We consider SU(N) Yang–Mills theory on R2,1×S1, where S1 is a spatial circle. In the infrared limit of a small-circle radius the Yang–Mills action reduces to the action of a sigma model on R2,1 whose target space is a 2(N−1)-dimensional torus modulo the Weyl-group action. We argue that there is freedom in the choice of the framing of the gauge bundles, which leads to more general options. In particular, we show that this low-energy limit...

Multitemporal interpretation of remote sensing data

S. Müller, G.L.A. Mota & C.-E. Liedtke
The automated interpretation of aerial image data is a task with increasing significance for several applications, e.g. quality control and automatic updating of GIS data, automatic land use change detection, measurement of sealed areas for public authority uses, monitoring of land erosion etc. The use of additional sensors could improve the performance of the automated classification; however, because of additional costs or simple unavailability of data, this approach should be avoided. One possibility to stabilize...

Modelling and designing cryogenic hydrogen tanks for future aircraft applications

C. Winnefeld, T. Kadyk, B. Bensmann, U. Krewer & R. Hanke-Rauschenbach
In the near future, the challenges to reduce the economic and social dependency on fossil fuels must be faced increasingly. A sustainable and efficient energy supply based on renewable energies enables large-scale applications of electro-fuels for, e.g., the transport sector. The high gravimetric energy density makes liquefied hydrogen a reasonable candidate for energy storage in a light-weight application, such as aviation. Current aircraft structures are designed to accommodate jet fuel and gas turbines allowing a...

Modeling of photoluminescence in laser-based lighting systems

E. Chatzizyrli, N. Tinne, R. Lachmayer, J. Neumann & D. Kracht
The development of laser-based lighting systems has been the latest step towards a revolution in illumination technology brought about by solid-state lighting. Laser-activated remote phosphor systems produce white light sources with significantly higher luminance than LEDs. The weak point of such systems is often considered to be the conversion element. The high-intensity exciting laser beam in combination with the limited thermal conductivity of ceramic phosphor materials leads to thermal quenching, the phenomenon in which the...

Model checking and validity in propositional and modal inclusion logics

L. Hella, A. Kuusisto, A. Meier & J. Virtema
Propositional and modal inclusion logic are formalisms that belong to the family of logics based on team semantics. This article investigates the model checking and validity problems of these logics. We identify complexity bounds for both problems, covering both lax and strict team semantics. By doing so, we come close to finalising the programme that ultimately aims to classify the complexities of the basic reasoning problems for modal and propositional dependence, independence, and inclusion logics.

Microaggregates in soils

K.U. Totsche, W. Amelung, M.H. Gerzabek, G. Guggenberger, E. Klumpp, C. Knief, E. Lehndorff, R. Mikutta, S. Peth, A. Prechtel, N. Ray & I. Kögel-Knabner
All soils harbor microaggregates, i.e., compound soil structures smaller than 250 µm. These microaggregates are composed of diverse mineral, organic and biotic materials that are bound together during pedogenesis by various physical, chemical and biological processes. Consequently, microaggregates can withstand strong mechanical and physicochemical stresses and survive slaking in water, allowing them to persist in soils for several decades. Together with the physiochemical heterogeneity of their surfaces, the three-dimensional structure of microaggregates provides a large...

Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland

M.E. Hartley, E. Bali, J. Maclennan, D.A. Neave & S.A. Halldórsson
The 2014–2015 Holuhraun eruption, on the Bárðarbunga volcanic system in central Iceland, was one of the best-monitored basaltic fissure eruptions that has ever occurred, and presents a unique opportunity to link petrological and geochemical data with geophysical observations during a major rifting episode. We present major and trace element analyses of melt inclusions and matrix glasses from a suite of ten samples collected over the course of the Holuhraun eruption. The diversity of trace element...

Mechanistic insights into plasmonic photocatalysts in utilizing visible light

K.H. Leong, A.A. Aziz, L.C. Sim, P. Saravanan, M. Jang & D. Bahnemann
The utilisation of sunlight as an abundant and renewable resource has motivated the development of sustainable photocatalysts that can collectively harvest visible light. However, the bottleneck in utilising the low energy photons has led to the discovery of plasmonic photocatalysts. The presence of noble metal on the plasmonic photocatalyst enables the harvesting of visible light through the unique characteristic features of the noble metal nanomaterials. Moreover, the formation of interfaces between noble metal particles and...

Mechanistic basis for the activation of plant membrane receptor kinases by SERK-family coreceptors

U. Hohmann, J. Santiago, J. Nicolet, V. Olsson, F.M. Spiga, L.A. Hothorn, M.A. Butenko & M. Hothorn
Plant-unique membrane receptor kinases with leucine-rich repeat ectodomains (LRR-RKs) can sense small molecule, peptide, and protein ligands. Many LRR-RKs require SERK-family coreceptor kinases for high-affinity ligand binding and receptor activation. How one coreceptor can contribute to the specific binding of distinct ligands and activation of different LRR-RKs is poorly understood. Here we quantitatively analyze the contribution of SERK3 to ligand binding and activation of the brassinosteroid receptor BRI1 and the peptide hormone receptor HAESA. We...

Measurement of the nonlinear refractive index in optical thin films

M. Steinecke, M. Jupé, K. Kiedrowski & D. Ristau
Based on the z-scan method, an interferometric set-up for measuring the optical Kerr-effect was engineered and optimized. Utilizing a Mach-Zehnder configuration, the wave front deformation caused by the Kerr induced selffocusing is monitored. Fitting this deformation to a theoretical approach basing on a beam propagation model, the nonlinear refractive index is obtained. The procedure can be applied to measure the nonlinear refractive index of both, the substrate material as well as the deposited dielectric layer...

Non-perturbative semiclassical model for strong-field ionization

N.I. Shvetsov-Shilovski, M. Lein, L.B. Madsen, E. Räsänen, C. Lemell, J. Burgdörfer, D.G. Arbó & K. Tkési
Synopsis We present a non-perturbative semiclassical model for strong-field ionization that accounts for path interferences of tunnel-ionized electrons in the ionic potential within the framework of a classical trajectory Monte-Carlo representation of the phase-space dynamics.

In vivo determination of carotenoid resonance excitation profiles of Chlorella vulgaris, Haematococcus pluvialis, and Porphyridium purpureum

Matthias Koch, Ann-Kathrin Kniggendorf, Merve Meinhardt-Wollweber & Bernhard Roth
Under stress, certain species of algae produce pigments such as astaxanthin, β‐carotene, or phycoerythrin for protection against photosynthethic stress. These pigments are of high commercial demand, for example, as food additives. Measuring and maintaining stress conditions precisely are necessary for efficient pigment synthesis in algae cultures. We present resonance excitation maps of three common species of algae, Chlorella vulgaris, Haematococcus pluvialis, and Porphyridium purpureum, exploring the feasibility of resonance Raman spectroscopy for stress monitoring in...

Ice-marginal forced regressive deltas in glacial lake basins: Geomorphology, facies variability and large-scale depositional architecture

J. Winsemann, J. Lang, U. Polom, M. Loewer, J. Igel, L. Pollok & C. Brandes
This study presents a synthesis of the geomorphology, facies variability and depositional architecture of ice-marginal deltas affected by rapid lake-level change. The integration of digital elevation models, outcrop, borehole, ground-penetrating radar and high-resolution shear-wave seismic data allows for a comprehensive analysis of these delta systems and provides information about the distinct types of deltaic facies and geometries generated under different lake-level trends. The exposed delta sediments record mainly the phase of maximum lake level and...

High-resolution 3D photopolymerization assisted by upconversion nanoparticles for rapid prototyping applications

V.V. Rocheva, A.V. Koroleva, A.G. Savelyev, K.V. Khaydukov, A.N. Generalova, A.V. Nechaev, A.E. Guller, V.A. Semchishen, B.N. Chichkov & E.V. Khaydukov
Three-dimensional (3D) rapid prototyping technology based on near-infrared light-induced polymerization of photocurable compositions containing upconversion nanomaterials has been explored. For this aim, the rationally-designed core/shell upconversion nanoparticles NaYF4:Yb3+,Tm3+/NaYF4, with the distinct ultraviolet-emitting lines and unprecedentedly high near-infrared to ultraviolet conversion efficiency of η UC UV=2% η UC (UV) = 2 % have been used. The upconverted ultraviolet photons were capable to efficiently activate photoinitiators contained in light-sensitive resins under moderate intensities of NIR excitation below...

GW170608: Observation of a 19 Solar-mass Binary Black Hole Coalescence

B.P. Abbott, R. Abbott, T.D. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams & Et Al.
On 2017 June 8 at 02:01:16.49 UTC, a gravitational-wave (GW) signal from the merger of two stellar-mass blackholes was observed by the two Advanced Laser Interferometer Gravitational-Wave Observatory detectors with anetwork signal-to-noise ratio of 13. This system is the lightest black hole binary so far observed, with componentmasses of 12+7 -2M⊙7+2 -2 (90% credible intervals). These lie in the range of measured black hole masses inlow-mass X-ray binaries, thus allowing us to compare black holes...

Matching cartographic objects in spatial databases

D. Mantel & U. Lipeck
Nowadays cartographic objects of different resolutions are hold in different coexisting databases. This implies an extensive amount of work for updating an object in all resolutions. One way to reduce this is to build a multi-resolution database which holds and links different representations of the real-world objects and allows to automatically pass updates to all linked representations (requiring algorithms for propagation of updates). In order to ensure the autonomy of applications on the local databases,...

Low threshold room temperature amplified spontaneous emission in 0D, 1D and 2D quantum confined systems

P. Chhantyal, S. Naskar, T. Birr, T. Fischer, F. Lübkemann, B.N. Chichkov, D. Dorfs, N.C. Bigall & C. Reinhardt
We address optical amplification properties of quantum nanoparticles of the cadmium selenide/cadmium sulfide (CdSe/CdS) material system with different dimensionality of spatial confinement. CdSe/CdS core/shell quantum dots (QDs), core/shell quantum rods (QRs) and 5 monolayer thick core/crown nanoplatelets (NPLs) at ambient temperature are considered, exhibiting 0D, 1D and 2D spatial confinement dimensionality of the electronic system, respectively. Continuous films of all these nanoparticles are synthesised, and amplified spontaneous emission (ASE) spectra are measured under femtosecond pumping...

Long-term delivery of brain-derived neurotrophic factor (BDNF) from nanoporous silica nanoparticles improves the survival of spiral ganglion neurons in vitro

N. Schmidt, J. Schulze, D.P. Warwas, N. Ehlert, T. Lenarz, A. Warnecke & P. Behrens
Sensorineural hearing loss (SNHL) can be overcome by electrical stimulation of spiral ganglion neurons (SGNs) via a cochlear implant (CI). Restricted CI performance results from the spatial gap between the SGNs and the electrode, but the efficacy of CI is also limited by the degeneration of SGNs as one consequence of SHNL. In the healthy cochlea, the survival of SGNs is assured by endogenous neurotrophic support. Several applications of exogenous neurotrophic supply have been shown...

Local and regional drivers of the African coffee white stem borer (Monochamus leuconotus) in Uganda

T. Liebig, R. Babin, F. Ribeyre, P. Läderach, P. Van Asten, H.-M. Poehling, L. Jassogne, C. Cilas & J. Avelino
The African coffee white stem borer (CWSB) Monochamus leuconotus is a destructive pest of Arabica coffee in Africa. Documentation on outbreaks, spatiotemporal development and the relationship with different environmental conditions and coffee production system is limited. To underpin effective control measures, we studied aspects of local and regional pest drivers in Eastern Uganda. At the local scale, we (i) characterized the temporal development of CWSB and explored associations with environmental and shade-related indicators. During two...

Investigation of second harmonic generation and multispectral imaging as new contrast mechanisms in scanning laser optical tomography

L. Nolte, G.C. Antonopoulos, A. Heisterkamp, T. Ripken & H. Meyer
Scanning laser optical tomography (SLOT) is a 3D imaging technique, based on the principle of computed tomography to visualize samples up to magnitude of several centimeters. Intrinsic contrast mechanisms as absorption, scattering and autofluorescence provide information about the 3D architecture and composition of the sample. Another valuable intrinsic contrast mechanism is second harmonic generation (SHG), which is generated in noncentrosymmetric materials and commonly used to image collagen in biological samples. The angular dependence of the...

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