Books

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2019-11-08
11:05
OpenAccess [FZJ-2019-05392] Book/Dissertation / PhD Thesis

Structural uptake and retention of safety relevant radionuclides by cementitious materials
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment 480, 133 pp. () = Dissertation, RWTH Aachen University, 2019
Cement-based materials are widely used in nuclear waste management, for example for the solidification of low and intermediate level wastes, as barrier materials in nuclear waste repositories, or in certain waste containers. However, the barrier function of the applied cementitious materials with respect to the migration of safety relevant radionuclides is not completely understood. [...]
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2019-11-08
10:29
OpenAccess [FZJ-2019-05389] Book/Dissertation / PhD Thesis

Mechanische Eigenschaften von Polymer-Elektrolyt-Membran-Brennstoffzellen
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment 478, 177 pages () = Dissertation, RWTH Aachen University, 2019
The polymer electrolyte membrane (PEM) fuel cell is conventionally constructed of a plurality of thin layer components that are pressed against each other by end plates and clamping elements in order to ensure electrical contact amongst the layers and tightness of the cell’s construction. If the contact pressure is increased, the contact resistances of the layers decrease, and in turn the ohmic resistance of the cell decreases [...]
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2019-10-25
14:30
OpenAccess [FZJ-2019-05254] Book/Dissertation / PhD Thesis

Spin-orbitronics at the nanoscale: From analytical models to real materials
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Schlüsseltechnologien / Key Technologies 204, 228 pp. () = Dissertation, RWTH Aachen University, 2019
This thesis provides a theoretical description of magnetic nanostructures in inversionasymmetric environments with strong spin-orbit interaction (SOI). The theoretical concepts introduced here can be applied in the field of spin-orbitronics, which consists ofexploiting the SOI to manipulate the electron spin without external magnetic fields. [...]
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2019-10-25
13:47
OpenAccess [FZJ-2019-05253] Book/Dissertation / PhD Thesis

Current-induced magnetization switching in a model epitaxial Fe/Au bilayer
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Schlüsseltechnologien / Key Technologies 202, vi, 120, XXXVIII () = Dissertation, Univ. Duisburg, 2019
In electronics, the application of novel spintronic three-terminal memory devices is proposed to facilitate further improvements of the performance of electronic components. A promising write-mechanism in a spintronic memory is based on the purely electricalswitching of the magnetization by spin-orbit torque (SOT) that can occur, for example, at the interface of heavy metal (HM)/ferromagnetic metal (FM) bilayers.....
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2019-10-25
12:52
OpenAccess [FZJ-2019-05250] Book/Dissertation / PhD Thesis

Morphology and Degradation of High Temperature Polymer Electrolyte Fuel Cell Electrodes
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment 479, III, 162 () = Dissertation, RWTH Aachen University, 2019
The polybenzimidazole-based high-temperature polymer electrolyte fuel (HT-PEFC) has become a major topic in the clean energy field in recent years due to the appealing advantages, e.g., improved electrochemical kinetics and enhanced tolerance to carbon monoxide. However, the introduction of phosphoric acid (PA) in the membrane electrode assembly (MEA) leads to several issues, e.g., phosphate contaminations, accelerated Pt corrosion, and PA leaching [...]
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2019-10-25
10:31
OpenAccess [FZJ-2019-05242] Book/Dissertation / PhD Thesis

Massentransportphänomene in Schichtsystemen eines Elektrolyseurs
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment 477, 107 pp. () = Dissertation, RWTH Aachen University, 2019
In this work, the mass transport in layer systems of an electrolyzer is investigated. Direct and indirect examination methods were used [...]
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2019-10-25
10:12
OpenAccess [FZJ-2019-05237] Book/Dissertation / PhD Thesis

Partitioning of carbon dioxide exchange in rapidly and slowly changing ecosystems
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment 476, xvi, 95 () = Dissertation, Univ. Bonn, 2019
A key question in times of climate change is, how the biosphere responds to global change and the local land use management in regard to its carbon cycle. At the present time, the land surface acts as a sink for anthropogenic carbon dioxide (CO2) emissions. [...]
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2019-10-22
11:34
OpenAccess [FZJ-2019-05168] Book/Report

Hyperfeineigenschaften und Gitterrelaxationen von Defekten in Halbleitern und Metallen
[Juel-3731]
Jülich : Forschungszentrum Jülich, Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 3731, II, 201 p. ()
The electronic and geometrical structures, in particular the electric field gradients (EFGs), of [CdD]$^{-}$ (D=P, As, Sb) acceptor-donor pairs in Si and Ge are studied using the full potential Korringa-Kohn-Rostoker (KKR) Green's function method. Since the EFG depends very sensitively an lattice relaxations, the method is extended to treat large displacements with higher accuracy and less computing time [...]
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2019-10-22
10:55
OpenAccess [FZJ-2019-05166] Book/Report

Anwendbarkeit einer Marker-Technik zur Unterstützung von Rißwachstumsuntersuchungen in spröden und duktilen Ni-Legierungen bei 500 und 750 Grad Celsius
[Juel-3728]
Jülich : Forschungszentrum Jülich, Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 3728, 164 p. ()
The crack growth behaviour of materials for application in turbines at temperatures of 500- 750 °C has been investigated. The creep and fatigue service loadings of a real turbine clisc were simulated by introclucing hold-times [...]
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2019-10-22
10:14
OpenAccess [FZJ-2019-05165] Book/Report

Equilibrium properties and main design parameters of a long pulsed spherical torus
[Juel-3727]
Jülich : Forschungszentrum Jülich, Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 3727, 58 p. ()
At tight aspect ratios tokamak plasmas possess features not present at large aspect ratios, such as natural elongation, triangularity, a natural divertor configuration and a considerable bootstrap effect. However, the pulse duration in ST's (Spherical Tori) seems to be considerably smaller than in conventional takamaks due to the much smaller flux swing of the primary solenoid in ST's [...]
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