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Now showing items 81-90 of 997
Aufsatz
Polarization Dependent Photoinduced Supramolecular Chirality in High-Performance Azo Materials
(2021-05-11)
Here, we will show photo-induced supramolecular chirality in thin films of achiral amorphous polymers with azo groups in their side-chain. A matter of particular interest is the effect of various film thicknesses on azimuthal rotation and ellipticity of incident/transmitted polarized light. Furthermore, we investigated the temporal stability of inscribed chirality. By polarimetric measurements, we found out that the azimuthal rotation gets higher with layer thickness. In this scope, we were able to measure a very ...
Aufsatz
Arthropod Communities in Urban Agricultural Production Systems under Different Irrigation Sources in the Northern Region of Ghana
(2020-08-01)
Urban and peri-urban agricultural (UPA) production systems in West African countries do not only mitigate food and financial insecurity, they may also foster biodiversity of arthropods and partly compensate for structural losses of natural environments. However, management practices in UPA systems like irrigation may also contribute to disturbances in arthropod ecology. To fill knowledge gaps in the relationships between UPA management and arthropod populations, we compared arthropods species across different irrigation ...
Aufsatz
Deutungen: eine qualitative Studie unmittelbarer Patientenreaktionen
(2021-04-22)
Klassische psychoanalytische Deutungen stießen in den letzten Jahren vermehrt auf Kritik: Demnach würden diese Deutungen der therapeutischen Beziehung schaden, Blockaden auslösen und mit einer problematischen therapeutischen Haltung einhergehen. Anhand der Tonbandaufnahmen von 35 psychoanalytischen Sitzungen im mittleren Behandlungsverlauf, die im Rahmen der Münchner Psychotherapiestudie aufgezeichnet wurden, wurden 23 klassische Deutungen in 16 Sitzungen identifiziert und die Reaktionen der Patientinnen und Patienten ...
Aufsatz
The Covid-19 containment effects of public health measures: A spatial difference-in-differences approach
(2021-04-12)
The paper studies the containment effects of public health measures to curb the spread of Covid-19 during the first wave of the pandemic in spring 2020 in Germany. To identify the effects of six compound sets of public health measures, we employ a spatial difference-in-differences approach. We find that contact restrictions, mandatory wearing of face masks and closure of schools substantially contributed to flattening the infection curve. The significance of the impact of restaurant closure does not prove to be robust. ...
Aufsatz
First-Order Shape Derivative of the Energy for Elastic Plates with Rigid Inclusions and Interfacial Cracks
(2020-11-16)
Within the framework of Kirchhoff–Love plate theory, we analyze a variational model for elastic plates with rigid inclusions and interfacial cracks. The main feature of the model is a fully coupled nonpenetration condition that involves both the normal component of the longitudinal displacements and the normal derivative of the transverse deflection of the crack faces. Without making any artificial assumptions on the crack geometry and shape variation, we prove that the first-order shape derivative of the potential ...
Aufsatz
Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels
(2020-10-15)
We present a numerical investigation on the detection of superparamagnetic labels using a giant magnetoresistance (GMR) vortex structure. For this purpose, the Landau–Lifshitz–Gilbert equation was solved numerically applying an external z-field for the activation of the superparamagnetic label. Initially, the free layer’s magnetization change due to the stray field of the label is simulated. The electric response of the GMR sensor is calculated by applying a self-consistent spin-diffusion model to the precomputed ...
Aufsatz
German Professors’ Motivation to Act as Peer Reviewers in Accreditation and Evaluation Procedures
(2021-01-09)
Acting as a reviewer is considered a substantial part of the role-bundle of the academic profession (quality assurance (QA) and quality enhancement (QE) role). Research literature about peer review, for example, for journals and grants, shows that acting as a peer reviewer adds to an academic’s reputation. However, little is known about academics’ motivation to act as reviewers. Based on self-determination theory, the multidimensional work motivation scale (Gagné et al. 2015) is used for a survey of German professors ...
Aufsatz
Tests and academic cheating: do learning tasks influence cheating by way of negative evaluations?
(2020-04-27)
Desirable difficulties like tests were often shown to increase long-term learning. However, due to the complexity and difficulty of such tasks, they are also argued to result in negative consequences like stress, anxiety, pressure, frustration, or negative evaluations. In other studies, such consequences were, in turn, often found to increase dishonest behaviour. Hence, the present work tests the assumptions that tests as difficult learning tasks, contrary to reading, lead to more negative evaluations of the learning ...
Aufsatz
Exploiting ferroelectric and ferroelastic effects in piezoelectric energy harvesting: theoretical studies and parameter optimization
(2021-02-18)
While piezoelectric energy harvesting typically focuses on converting mechanical into electrical energy on the basis of the linear reversible piezoelectric effect, the potential of exploiting the non-linear ferroelectric effect is investigated theoretically in this paper. Due to its dissipative nature, domain switching, on the one hand, is basically avoided in order to prevent mechanical energy from being converted into heat. However, the electrical output, on the other hand, is augmented due to the increased change ...
Aufsatz
A Stable N-Heterocyclic Silylene with a 1,1′-Ferrocenediyl Backbone
(2020-10-15)
The N-heterocyclic silylene [{Fe(η⁵-C₅H4-NDipp)₂}Si] (1DippSi, Dipp=2,6-diisopropylphenyl) shows an excellent combination of pronounced thermal stability and high reactivity towards small molecules. It reacts readily with CO₂ and N₂O, respectively affording (1DippSiO₂)₂C and (1DippSiO)₂ as follow-up products of the silanone 1DippSiO. Its reactions with H₂O, NH₃, and FcPH₂ (Fc=ferrocenyl) furnish the respective oxidative addition products 1DippSi(H)X (X=OH, NH₂, PHFc). Its reaction with H₃BNH₃ unexpectedly results in ...