Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots See

The combination of semiconductor based materials with magnetic properties in so called diluted magnetic semiconductors could revolutionize the field of spintronics. Here, the charge and spin properties of such devices can be utilized for the processing and storage of data. The magnetic properties of gallium manganese arsenide (GaMnAs), which is a promising candidate for ferromagnetic ordering at room temperature, have been extensively studied over the years. Especially, the Curie temperature ...

Statistical analysis of concentration-dependent high-dimensional gene expression data See

Understanding the behavior of genes as a response to external influences, such as radiation or chemicals, on a fundamental level is one of the great challenges of modern biology. In specific, the investigation of chemically-induced toxicity is of major importance since it is crucial for the identification of biomarkers and the development of drugs. One approach to accomplish this objective utilizes toxicogenomics which is based upon the combination of toxicology and the analysis of genome-wi...

Verständnis alkalimetallspezifischer Effekte zum Steuern ausgewählter metallorganischer Reaktionen See

Eine hierarchische Modellierung der Thermoelastoplastizität und nicht-lokalen Schädigung mit adaptiver Modellwahl See

Preconditioning for hyperelasticity-based mesh optimisation See

A robust mesh optimisation method is presented that directly enforces the resulting deformation to be orientation preserving. Motivated by aspects from mathematical elasticity, the energy functional of the mesh deformation can be related to a stored energy functional of a hyperelastic material. Formulating the functional in the principal invariants of the deformation gradient allows fine grained control over the resulting deformation. Solution techniques for the arising nonconvex and highl...

Model-based prognostics for energy-constrained mobile systems operating in stochastic environments See

Due to development of novel and more efficient energy storage systems we bear witness to the dawn of a new era of mobile systems. They have become sophisticated in terms of hardware components and software applications which have made it possible to develop integrated solutions for a large number of imaginable applications ranging from electric vehicles all the way to fully autonomous systems operating in a wide variety of ecosystems, e.g., service, surveillance or bio-inspired robots. Genera...

Funktionale anorganisch/organische Hybridmaterialien für ultrasteife Hydrogele und antimikrobielle Lotusoberflächen See

Object-level fusion for surround environment perception in automated driving applications See

Driver assistance systems have increasingly relied on more sensors for new functions. As advanced driver assistance system continue to improve towards automated driving, new methods are required for processing the data in an efficient and economical manner from the sensors for such complex systems. The detection of dynamic objects is one of the most important aspects required by advanced driver assistance systems and automated driving. In this thesis, an environment model approach for the det...

Klimaanpassung in der Regionalplanung See

Seit Veröffentlichung der Deutschen Anpassungsstrategie an den Klimawandel herrscht wissenschaftlicher und planungspolitischer Konsens darüber, dass die Regionalplanung zur Implementation von Klimaanpassungsinhalten befähigt ist. Inwieweit die formelle Regionalplanung dieser Befähigung gegenwärtig nachkommt, ist zentraler Untersuchungsgegenstand dieses Artikels. Die Analyse ist eine Vollerhebung für die Regionalplanungsgebiete Deutschlands. Deren Regionalpläne werden auf Vorhandensein und V...

Age-Friendly Development of a District from the 1950s – the Südstadt in Hattingen See

The central questions of the study are: Which adaptation strategies need to be taken in order to achieve integrated urban planning in German residential districts from the 1950s and to allow the elderly a self-determined and independent life within these neighborhoods, and which conceptual approaches arise in the three fields of action “dwelling”, “residential environment” and “social”. The empirical study area is Hattingen’s Südstadt, a typical district from the 1950s. Hattingen is a mid-siz...

Co-Konfiguration von Hardware- und Systemsoftware-Produktlinien See

Hardwarearchitekturen im Kontext von Eingebetteten Systemen werden immer komplexer und bewegen sich zukünftig immer häufiger in Richtung von Multi- oder Manycore-Systemen. Damit diese Systeme ihre optimale Leistungsfähigkeit – für die oftmals speziellen Aufgaben im Kontext von Eingebetteten Systemen – ausspielen können, beschäftigen sich ganze Forschungszweige mit der anwendungsspezifischen Maßschneiderung dieser Systeme. Insbesondere die Popularität von Hardwarebeschreibungssprachen trägt da...

Beitrag zur Konfiguration von globalen Wertschöpfungsnetzwerken See

In this thesis an approach for the configuration of global networks is developed, to face new challenges posed by Industrie 4.0 and an increasing globalization. Industrie 4.0 leads to higher autonomy and self-organization of single supply chain processes. Globalization causes an increasing fragmentation und worldwide scattering of supply chain units. Until now, decisions for configuration are often enforced by strategic directions on a network level. However, the arrangement of the network st...

Natural Convection Flow of a Two-Phase Dusty Non-Newtonian Fluid Along a Vertical Surface See

The aim of this paper is to present a boundary-layer analysis of two-phase dusty non-Newtonian fluid flow along a vertical surface by using a modified power-law viscosity model. This investigation particularly reports the flow behavior of spherical particles suspended in the non-Newtonian fluid. The governing equations are transformed into nonconserved form and then solved straightforwardly by implicit finite difference method. The numerical results of rate of heat transfer, rate of shea...

Memory-aware platform description and framework for source-level embedded MPSoC software optimization See

Developing optimizing source-level transformations, consists of numerous non-trivial subtasks. Besides identifying actual optimization goals within a particular target-platform and compiler setup, the actual implementation is a tedious, error-prone and often recurring work. Providing appropriate support for this development work is a challenging task. Defining and implementing a well-suited target-platform description which can be used by a wide set of optimization techniques while being prec...

Konzeption und Konstruktion des Klosterplans von St. Gallen im Karolingischen Reichenauer Skriptorium See

Diese Dissertation unternimmt es, ganz im Sinne Droysens, den Klosterplan ‚aus seiner Zeit‘, d. h. dem frühen neunten Jahrhundert, und ‚aus sich selbst‘, d. h. seiner materiellen Überlieferung heraus zu verstehen. Das Nachzeichnen des Kultur- und Wis- senshorizonts in den karolingischen Klöstern zu jener Zeit führte im Wesentlichen zu den Ergebnissen, daß der Klosterplan ohne Hilfsgitter entstanden ist, er weder religiö- se Reformvorstellungen (Aniane) noch benediktinische Klosterregeln (RB) ...

Analysis and optimal control of a damage model with penalty See

A viscous damage model including two damage variables - a local and a nonlocal one - coupled through a penalty term is investigated on three different levels: unique solvability, behaviour as the penalization parameter approaches ∞ and optimal control. Existence, uniqueness and regularity of the solutions are proven. In particular, we give an improved result regarding spacial regularity of the nonlocal damage. Lipschitz continuity as well as Fréchet-differentiability of the solution operato...

Von temporär vernetzten Grenzflächenfilmen zu Mikrokapseln See

Durch die vielfältigen technischen Anwendungsmöglichkeiten mikroverkapselter Systeme besteht ein stetiges Interesse an neuartigen Grenzflächen- und Membranfilmen, die eine effektive Stabilisierung von Emulsionstropfen ermöglichen. Im Rahmen dieser Dissertation wurden erstmals temporär vernetzte Mikrokapseln entwickelt, charakterisiert und ihr Verhalten in externen Zentrifugal- und Scherfeldern untersucht. Im Vordergrund stand dabei der Vergleich zweier unterschiedlicher Substanzklassen, Sorbi...

Electron and nuclear spin dynamics in fluorine-doped ZnSe epilayers See

Electron spins in semiconductors are considered as candidates for quantum bits. This thesis presents a study of the spin dynamics of the strongly localized donor-bound electrons in fluorine-doped ZnSe epilayers via pump-probe Kerr rotation technique. A method exploiting the spin inertia is developed and used to measure the longitudinal spin relaxation time (T1). The excitation of the same samples with helicity-modulated laser pulses results in a transverse nuclear spin polarization, which was...

Adaptive optimal control of the signorini's problem See

In this article, we present a-posteriori error estimations in context of optimal control of contact problems; in particular of Signorini’s problem. Due to the contact side-condition, the solution operator of the underlying variational inequality is not differentiable, yet we want to apply Newton’s method. Therefore, the non-smooth problem is regularized by penalization and afterwards discretized by finite elements. We derive optimality systems for the regularized formulation in the continuous...