21,488 Works

Polymerizable Ionic Liquids for Solid-State Polymer Electrolytes

Robert Löwe, Thomas Hanemann & Andreas Hofmann
Eight new polymerizable ammonium-TFSI ionic liquids were synthesized and characterized with respect to an application in energy storage devices. The ionic liquids feature methacrylate or acrylate termination as polymerizable groups. The preparation was optimized to obtain the precursors and ionic liquids in high yield. All products were characterized by NMR and IR spectroscopy. Phase transition temperatures were obtained by DSC analysis. Density, viscosity and ionic conductivity of the ionic liquids were compared and discussed. The...

Frequent Observations from a Battery System with Subunits

Georg Steinbuß, Benedikt Rzepka, Simon Bischof, Thomas Blank & Klemens Böhm

Modelling drivers of variance and adaptation for the prediction of thermal perception and energy use in zero energy buildings

M. Schweiker
As thermal perception is a subjective "condition of mind", a high variance in observed thermal sensation votes does not come to a surprise. Literature reviews show a large number of individual and contextual influences. However, the quantification of the effect of individual drivers on thermal perception as well as thermal adaptation and their integration into thermal comfort models is still an open field of research. Still, analyses of the energy balance of zero-energy buildings (ZEB)...

Reliability of an Item Set Assessing Indoor Climate in Offices—Results From Field Studies and Laboratory Research

K. Schakib-Ekbatan, S. Lechner & M. Schweiker
Assessing building user needs and preferences is widespread and often questionnaire surveys are applied in order to assess environmental perception and satisfaction. A central question in this context is the quality of the questionnaires used, but little is known regarding their reliability. The present study addresses interdisciplinary aspects such as engineering and psychological sciences to answer the questions: Are the same item sets applicable in various settings (e.g., seasons)? Is there any difference in the...

Fluorescent thermal imaging of a non-insulated pancake coil wound from high temperature superconductor tape

R Gyuráki, T Benkel, F Schreiner, F Sirois & F Grilli

Search for long-lived particles using delayed photons in proton-proton collisions at √s = 13 TeV

A. M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, M. Jeitler, N. Krammer, I. Krätschmer, D. Liko, T. Madlener, I. Mikulec, N. Rad, J. Schieck, R. Schöfbeck, M. Spanring, D. Spitzbart, W. Waltenberger, C.-E. Wulz, M. Zarucki … & N. Woods
A search for long-lived particles decaying to photons and weakly interacting particles, using protonproton collision data at √s=13 TeV collected by the CMS experiment in 2016–2017 is presented. The data set corresponds to an integrated luminosity of 77.4 fb−1. Results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay...

Duration of classicality of an inhomogeneous quantum field with repulsive contact self-interactions

Ariel Arza, Sankha S. Chakrabarty, Seishi Enomoto, Yaqi Han & Elisa Todarello
Quantum fields with large degeneracy are often approximated as classical fields. Here, we show how the quantum and classical evolution of a highly degenerate quantum field with repulsive contact self-interactions differ fromeach other. Initially, the field is taken to be homogeneous except for a small plane-wave perturbation in only one mode. In quantum field theory, modes satisfying both momentum and energy conservation of the quasiparticles, grow exponentially with time. However, in the classical field approximation,...

Characterisation of REBCO Roebel cables

Simon J. Otten
This work concerns the characterization of high-temperature superconducting REBCO Roebel cables for use in accelerator magnets. The effects of bending, torsion and compressive stress on the cable are investigated. The second part concerns the effect of inter-strand resistance on the cable properties. A two-parameter model is proposed to describe inter-strand connections and predict the effect on AC loss and stability. Additionally, the AC loss and stability are experimentally investigated.

Characterisation of REBCO Roebel cables

Simon J. Otten

Conceptual Design of High Temperature Superconducting Toroidal Field Coils for Future Fusion Power Plants

Pattabhi Vishnuvardhan Gade
Aus der langjährigen Forschung im Bereich der magnetischen Eingrenzung sind Stellaratoren und Tokamaks entstanden, die starken und ungleichmäßigen Magnetfelder zum Einfangen der Plasmapartikel nutzen und es ihnen ermöglichen, sich frei auf bestimmten Wegen zu bewegen. Die Tokamaks haben durch ein einfacheres Spulendesign, verschachtelte magnetische Oberflächen und die Fähigkeit, mit positiver magnetischer Scherung zu arbeiten, an Bedeutung gewonnen. Derzeit plant die Europäische Union (EU), ihre Studien über Tokamak auf Demonstrationskraftwerke (EU-DEMO) auszudehnen, der Strom erzeugen können....

SEVIRI Hyper-Fast Forward Model with Application to Emissivity Retrieval

Guido Masiello, Carmine Serio, Sara Venafra, Laurent Poutier & Frank-M. Göttsche

An All-Weather Land Surface Temperature Product Based on MSG/SEVIRI Observations

João P. A. Martins, Isabel F. Trigo, Nicolas Ghilain, Carlos Jimenez, Frank-M. Göttsche, Sofia L. Ermida, Folke-S. Olesen, Françoise Gellens-Meulenberghs & Alirio Arboleda
A new all-weather land surface temperature (LST) product derived at the Satellite Application Facility on Land Surface Analysis (LSA-SAF) is presented. It is the first all-weather LST product based on visible and infrared observations combining clear-sky LST retrieved from the Spinning Enhanced Visible and Infrared Imager on Meteosat Second Generation (MSG/SEVIRI) infrared (IR) measurements with LST estimated with a land surface energy balance (EB) model to fill gaps caused by clouds. The EB model solves...

Ultrashort Pulsed Laser Surface Patterning of Titanium to Improve Osseointegration of Dental Implants

Christoph Zwahr, Alexander Welle, Tobias Weingärtner, Christiane Heinemann, Benjamin Kruppke, Nikolai Gulow, Marzellus Große Holthaus & Andrés Fabián Lasagni

A one-step biofunctionalization strategy of electrospun scaffolds enables spatially selective presentation of biological cues

Paul Wieringa, Andre Girao, Roman Truckenmuller, Alexander Welle, Silvestro Micera, Richard Van Wezel & Lorenzo Moroni
To recapitulate the heterogeneous complexity of tissues in our body with synthetic mimics of the extracellular matrix (ECM), it is important to develop methods that can easily allow the selective functionalization of defined spatial domains. Here, we introduce a facile method to functionalize microfibrillar meshes with different reactive groups able to bind biological moieties in a one-step reaction. The resulting scaffolds proved to selectively support a differential neurite growth after being seeded with dorsal root...

Charge carrier dynamics and interfaces in perovskite solar cells

Diana Paola Rueda Delgado
Organometallhalogenid-Perowskite sind hybride Halbleiter, die in jüngster Zeit aufgrund ihrer hervorragenden Halbleitereingeschaften und attraktiven optischen Eigenschaften die Aufmerksamkeit der Wissenschaft auf sich gezogen haben. Seitdem wurde die exzellente Eignung dieser Materialklasse für verschiedenste opto-elektrische Anwendungen wie z.B. Solarzellen, LEDs und Lasern unter Beweis gestellt. Die physikalischen Mechanismen, die die Grundlage für diese einzigartigen, qualitativ Hochwertigen Eigenschaften bilden, sind jedoch noch weitgehend unbekannt. Dieses Manuskript stellt eine Studie über die optischen Eigenschaften von Perowskitfilmen für den...

Optimization of the value chain of the existing free potentials of wood resources for power generation in Baden-Württemberg

Javier Parrilla-Martinez
The energy mix of Baden-Württemberg – one of the most wooded regions of Germany – could be diversified through the optimal valorisation of the existing free potentials of wood resources. Circa 17 PJ of forest residues and landscape wood raw material grow annually over the territory of this federal state. For this reason, an optimisation of the corresponding value chain for power purposes is accomplished in order to identify the most cost-efficient utilisation pathways. Firstly,...

Optimization of the value chain of the existing free potentials of wood resources for power generation in Baden-Württemberg

Javier Parrilla-Martinez
The energy mix of Baden-Württemberg – one of the most wooded regions of Germany – could be diversified through the optimal valorisation of the existing free potentials of wood resources. Circa 17 PJ of forest residues and landscape wood raw material grow annually over the territory of this federal state. For this reason, an optimisation of the corresponding value chain for power purposes is accomplished in order to identify the most cost-efficient utilisation pathways. Firstly,...

Unexpected Non-acid Drainage from Sulfidic Rock Waste

Andrea R. Gerson, Peter J. Rolley, Catherine Davis, Sandrin T. Feig, Stephen Doyle & Roger St. C. Smart

Anwendungen der Laser- Raman- Spektroskopie im Kernbrennstoffzyklus

E. Gantner, D. Steinert, M. Freudenberger & H.J. Ache

Parallel Weighted Random Sampling [in press]

Lorenz Hübschle-Schneider & Peter Sanders
Data structures for efficient sampling from a set of weighted items are an important building block of many applications. However, few parallel solutions are known. We close many of these gaps both for shared-memory and distributed-memory machines. We give efficient, fast, and practicable algorithms for sampling single items, k items with/without replacement, permutation, subset sampling, and reservoir sampling. Our output sensitive algorithm for sampling with replacement also improves the state of the art for sequential...

Tailoring the stability/aggregation of one-dimensional TiO₂(B)/titanate nanowires using surfactants

A. Selmani, J. Lützenkirchen, K. Kučanda, D. Dabić, E. Redel, I. D. Marion, D. Kralj, D. D. Jurašin & M. D. Sikirić
The increased utilization of one-dimensional (1D) TiO2 and titanate nanowires (TNWs) in various applications was the motivation behind studying their stability in this work, given that stability greatly influences both the success of the application and the environmental impact. Due to their high abundance in aqueous environments and their rich technological applicability, surfactants are among the most interesting compounds used for tailoring the stability. The aim of this paper is to determine the influence of...

Efficient HTS DC- Cable for Power Distribution in Hybrid-Electric Aircraft

Steffen Elschner, Sonja I. Schlachter, Joerg Brand, Stefan Fink, Bernhard Holzapfel, Andrej Kudymow & Severin Strauss
With respect to a substantial reduction of greenhouse gas emission, noise reduction and combustible consumption in aircraft an increasing interest in hybrid-electric propulsion systems has emerged in the last years. In the frame of a German research project we actually develop a HTS superconducting busbar system for DC currents able to join the different components as generator, motors and battery systems on the plane. Main features of this busbar system are large currents at moderate...

A high-resolution hydro power time-series model for energy systems analysis: Validated with Chinese hydro reservoirs

H. Liu, G. B. Andresen, T. Brown & M. Greiner
We expand the renewable technology model palette and present a validated high resolution hydro power time series model for energy systems analysis. Among the weather-based renewables, hydroelectricity shows unique storage-like flexibility, which is particularly important given the high variability of wind and solar power. Often limited by data availability or computational performance, a high resolution, globally applicable and validated hydro power time series model has not been available. For a demonstration, we focus on 41...

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