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Hybrid optimization schemes for quantum control
(Springer Open, 2015)
Optimal control theory is a powerful tool for solving control problems in quantum mechanics, ranging from the control of chemical reactions to the implementation of gates in a quantum computer. Gradient-based optimization methods are able to find high fidelity controls, but require considerable numerical effort and often yield highly complex solutions. We propose here to employ a two-stage optimization scheme to significantly speed up convergence and achieve simpler controls. The control is initially parametrized ...
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The Effects of Visual Discriminability and Rotation Angle on 30-Month-Olds’ Search Performance in Spatial Rotation Tasks
(Frontiers Research Foundation, 2016-10-20)
Tracking objects that are hidden and then moved is a crucial ability related to object permanence, which develops across several stages in early childhood. In spatial rotation tasks, children observe a target object that is hidden in one of two or more containers before the containers are rotated around a fixed axis. Usually, 30-month-olds fail to find the hidden object after it was rotated by 180°. We examined whether visual discriminability of the containers improves 30-month-olds’ success in this task and whether ...
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Electronic origin of bond softening and hardening in femtosecond-laser-excited magnesium
(IOP, 2014)
Many ultrafast structural phenomena in solids at high fluences are related to the hardening or softening of particular lattice vibrations at lower fluences. In this paper we relate femtosecond-laser-induced phonon frequency changes to changes in the electronic density of states, which need to be evaluated only in the electronic ground state, following phonon displacement patterns. We illustrate this relationship for a particular lattice vibration of magnesium, for which we—surprisingly—find that there is both softening ...
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Enlarging a training set for genomic selction by imputation of un-genotyped animals in populations of varying genetic architecture
(BioMed Central, 2013)
Background: The most common application of imputation is to infer genotypes of a high-density panel of markers on animals that are genotyped for a low-density panel. However, the increase in accuracy of genomic predictions resulting from an increase in the number of markers tends to reach a plateau beyond a certain density. Another application of imputation is to increase the size of the training set with un-genotyped animals. This strategy can be particularly successful when a set of closely related individuals are ...
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Can carbon payments improve profitability of traditional conventional and organic cocoa agroforests? A case study in the Eastern Region of Ghana
(2023-03-16)
This study investigates the carbon (C) sequestration of traditional cocoa agroforestry systems in the Eastern Region of Ghana and the theoretical impact of CO₂ emission rights trading on their profitability. The study was conducted in four villages of Suhum Municipality, two each with either conventional or organic cocoa cultivation systems. Profitability was calculated using net present value of net cashflow (NPV), benefit cost ratio (BCR), and modified internal rate of return (MIRR). Carbon revenues were calculated ...
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Coaching zum Spannungsfeld von Dominanz und Unterordnung – Perspektiven für eine situationsadäquate Selbstregulation
(2021-10-27)
Die Forschung widmete sich der Frage, wie Einzelcoaching dazu beiträgt, dass Coachees eine situationsadäquate Selbstregulation von Dominanz und Unterordnung gelingt. Zunächst wird die Relevanz des Themas für die Coachingpraxis und das Spannungsfeld von Dominanz und Unterordnung erörtert. Das Instrument der operationalisierten psychodynamischen Diagnostik diente als Grundlage für das Forschungsdesign. Anschließend wird die verwendete Methode beschrieben, und die Ergebnisse der Forschung werden komprimiert dargelegt. ...
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Lifetime Prediction with Combined Hygro-Thermo-Mechanical Influences on Thick Layer Adhesives
(2023-05-31)
Semi-structural bonded joints of steel components are exposed to long-term stresses in addition to water diffusion, temperature changes and varying external forces during operation. These hygro-thermomechanical loadings lead to successive degradation of stiffness and strength due to damage resulting from chemical aging and fatigue processes, causing failure of the bonded joint when its service life is reached. In the following contribution, a methodology is presented to predict the service life of hygro-thermo-mechanically ...
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Sustainable value in the fashion industry: A case study of value construction/destruction using digital twins
(2022-12-14)
New technologies—especially the emergence of digital fashion and a growing interest in creating digital twins (DTs)—are expected to alter existing value chains in the fashion industry as DT technology triggers a redesign of value creation processes. This qualitative case study demonstrates how and to what extent the development of DTs in the fashion industry addresses the sustainability needs of various stakeholders in both real-world and virtual-reality settings. The article examines the possibilities, benefits, and ...
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Stuck in between. Phenomenology’s Explanatory Dilemma and its Role in Experimental Practice
(2022-10-22)
Questions about phenomenology’s role in non-philosophical disciplines gained renewed attention. While we claim that phenomenology makes indispensable, unique contributions to different domains of scientific practice such as concept formation, experimental design, and data collection, we also contend that when it comes to explanation, phenomenological approaches face a dilemma. Either phenomenological attempts to explain conscious phenomena do not satisfy a central constraint on explanations, i.e. the asymmetry between ...