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Aufsatz
Miniaturized interferometric confocal distance sensor for surface profiling with data rates at ultrasonic frequencies
(2023-01-12)
Point-wise measuring profilometers like the tactile stylus instruments or optical sensors are established measurement tools in science and industry to measure and characterize surface textures. We present a fiber-coupled laser interferometric confocal distance sensor for surface profiling. The sensor is characterized by small geometric dimensions and by its high lateral
scanning speed. The ability to measure specularly reflecting and rough surface textures are demonstrated by performing several measurements on a ...
Aufsatz
Model-based investigations of ferroelectric energy harvesting with regard to an improvement of life span and operability
(2023-02-13)
A new ferroelectric energy harvesting concept is investigated theoretically, based on a thermo-electromechanical multiscale constitutive framework in connection with the so-called condensed method. Taking advantage of comparatively large changes of strain and polarization due to domain switching, the electric output is higher compared to what is commonly known as
piezoelectric energy harvesting. Dissipative self-heating and augmented damage accumulation, on the other hand, may impede the operability of the harvesting ...
Aufsatz
Einblicke in die Forschung – Bisheriger (Un‑)Wissensstand über den Nutzen von Supervision für Coaches und Psychotherapeut*innen
(2022-06-27)
In diesem Artikel der Zeitschrift für Psychodrama und Soziometrie (ZPS) werden die Ergebnisse aktueller Forschung zu Supervision in der Psychotherapie und im Coaching vorgestellt. Im Vordergrund steht die Frage nach dem Nutzen der Supervision für Supervisand*innen und ihre Klient*innen im jeweiligen Anwendungskontext. Relevante empirische Studien werden beschrieben, Wissenslücken betrachtet und Implikationen für zukünftige Forschung und die Praxis von Berater*innen werden abgeleitet.
Aufsatz
Lateral resolution enhanced interference microscopy using virtual annular apertures
(2023-01-27)
The lateral resolution in microscopic imaging generally depends on both, the wavelength of light and the numerical aperture of the microscope objective lens. To quantify the lateral resolution Ernst Abbe considered an optical grating illuminated by plane waves. In contrast, the Rayleigh criterion holds for two point sources or point scatterers separated by a lateral distance, which are
supposed to emit spherical waves. A portion of each spherical wave is collected by the objective lens and results in an Airy disc ...
Aufsatz
Theoretical study of spin polarization in multiphoton ionization of Xe
(2023-04-21)
Spin polarization in the multiphoton above-threshold ionization of 5p3/2- and 5p1/2-electrons of Xe with intense 395nm, circularly polarized laser pulses, is investigated theoretically. For this purpose, we solve the time-dependent Schrödinger equation on the basis of spherical spinors. We, thus, simultaneously propagate the spin-up and spin-down single-active-electron wave packets, driven by the laser pulses in the ionic potential, which includes the spin–orbit interaction explicitly. The present theoretical results ...
Aufsatz
What Helps the Unemployed to Stay Healthy? A Qualitative Study of Coping with the Negative Effects of Job Loss
(2022-05-22)
Background
A variety of empirical studies have shown the negative effects of unemployment on health. A research gap exists regarding salutogenic factors and successful coping strategies to master involuntary job loss and unemployment with the least damage to health. Hence, this study aims at generating a deeper understanding of coping with unemployment and maintaining health.
Design and methods
We conducted problem-centered guideline interviews with 21 unemployed people. For the analysis of the interviews, we ...
Rezension
Siefken, Sven T. (Hrsg.) (2021): Wahlkreisarbeit von Bundestagsabgeordneten. Parlamentarische Repräsentation in der Corona-Krise
(2023-01-11)
Rezension von Nadin Fromm zu: Siefken, Sven T. (Hrsg.) (2021): Wahlkreisarbeit von Bundestagsabgeordneten. Parlamentarische Repräsentation in der Corona-Krise. Wiesbaden: Springer VS. 150 Seiten. 54,99 €
Rezension
Hentges, Gudrun, Georg Gläser, und Julia Lingenfelder (Hrsg.) (2021): Demokratie im Zeichen von Corona
(2023-03-28)
Rezension von Klaus Moegling zu: Hentges, Gudrun, Georg Gläser, und Julia Lingenfelder (Hrsg.) (2021): Demokratie im Zeichen von Corona
Aufsatz
Potential of Fe-Mn-Al-Ni Shape Memory Alloys for Internal Prestressing of Ultra-High Performance Concrete
(2023-05-18)
Prestressing of concrete is a commonly used technique in civil engineering to achieve long spans, reduced structural thicknesses, and resource savings. However, in terms of application, complex tensioning devices are necessary, and prestress losses due to shrinkage and creep of the concrete are unfavourable in terms of sustainability. In this work, a prestressing method using novel Fe-Mn-Al-Ni shape memory alloy rebars as a tensioning system in UHPC is investigated. A generated stress of about 130 MPa was measured ...
Aufsatz
Flexible Electrochromic Device on Polycarbonate Substrate with PEDOT:PSS and Color-Neutral TiO2 as Ion Storage Layer
(2023-04-22)
Electrochromic (EC) windows on glass for thermal and glare protection in buildings, often referred to as smart (dimmable) windows, are commercially available, along with rearview mirrors or windows in aircraft cabins. Plastic-based applications, such as ski goggles, visors and car windows, that require lightweight, three-dimensional (3D) geometry and high-throughput manufacturing are still under development. To produce such EC devices (ECDs), a flexible EC film could be integrated into a back injection molding process, ...