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Aufsatz
Internal prestressing of ultra-high performance concrete using shape memory fibers
(2023-05-31)
Using shape memory fibers to reinforce concrete is a novel concept in civil engineering. Pre-stretched fibers are brought into concrete and after activating the shape memory effect, a compressive prestress state is introduced. The present work investigates this method numerically. A brief introduction to the relevant behavior of shape memory alloys is given. Fiber activation is modeled by an empirical phase transition model. Simulations are carried out by applying the Finite Element Method to solve the CAUCHY-FOURIER ...
Aufsatz
Optimal attitude maneuvers in the presence of prohibited directions
(2023-05-31)
We consider the problem of realigning a space telescope from one observation target to the next in the presence of prohibited directions. More specifically, we want to steer the space telescope – modelled as a gyrostat – from an initial attitude at rest to a final attitude at rest within a fixed time interval. During the motion, the line of sight of the telescope must be kept away from forbidden directions towards bright objects like the sun, moon or earth due to power or thermal requirements. The kinematics of the ...
Aufsatz
Influence of Mean Stress on Lifetime Prediction of Adhesive Bonds
(2023-05-31)
The importance of adhesive bonds in the field of joining technology is increasing due to their advantageous properties. One of these attributes is the possibility to reduce the weight compared to welded joints in group of components. For a safe design, the knowledge of the lifetime of these components is essential. Various methods are used for the prediction of the lifetime under cyclic loading. On the one hand there are test-based methods, on the other hand simulation-based approaches. Test-based ones are often ...
Aufsatz
Blood in milk in horned dairy cows–Exploration of incidences and prevention opportunities
(2023-07-20)
Husbandry of horned cows is one alternative to disbudding that respects the animals´ integrity. Concurrently, housing and management should be aligned with the animals' needs to minimize social interactions that can result in integument damage (ID) and udder injuries associated with blood in milk (BM). No information is available on incidences of BM, nor on specific preventive measures. Thus, this study aimed at investigating BM incidences in horned herds and testing whether compliance with guideline recommendations ...
Aufsatz
Impact of bias correction on climate change signals over central Europe and the Iberian Peninsula
(2023-07-27)
Vegetation models for climate adaptation and mitigation strategies require spatially high-resolution climate input data in which the error with respect to observations has been previously corrected. To quantify the impact of bias correction, we examine the effects of quantile-mapping bias correction on the climate change signal (CCS) of climate, extremes, and biological variables from the convective regional climate model COSMO-CLM and two dynamic vegetation models (LPJ-GUESS and CARAIB). COSMO-CLM was driven and ...
Aufsatz
The Road to Hell Is Paved With Good Intentions: How Common Practices in Scale Construction Hurt Validity
(2022-09-29)
Sound scale construction is pivotal to the measurement of psychological constructs. Common item sampling procedures emphasize aspects of reliability to the disadvantage of aspects of validity, which are less tangible. We use a health knowledge test as an example to demonstrate how item sampling strategies that focus on either factor saturation or construct coverage influence scale composition and demonstrate how to find a trade-off between these two opposing needs. More specifically, we compile three 75-item health ...
Buch
Queer Enough?
(Nomos, 2023)
The interrelationship between heteronormativity, homonormativity and hegemonic masculinity has widereaching ramifications for the representation of important moments and agents in LGBTQIAN+ history. In this study, the author examines how the films Howl, Stonewall and Milk enact the emancipation of their protagonists, while simultaneously reproducing their oppression and aestheticising their discrimination, thus making it consumable. This contradiction is emblematic of new forms of exclusion that function more subtly ...
Buch
Gefühlspolitische Selbst-Bildung. Zum kritischen Umgang mit politischen Gefühlen.
(Transcript, 2023)
Ob der Sturm auf das Kapitol in den USA, Corona-Proteste oder Verschwörungsglaube – Gefühle sind politisch und zugleich als Speicher von Wahrheit und Lebenserfahrung eine unanfechtbare Entscheidungsinstanz. Doch wie kann man kritisch mit solchen politischen Gefühlen umgehen? Auf Grundlage einer transdisziplinären Lektüre der Debatten zu »Gefühl« und »Kritik« analysiert Frederik Metje Ansätze, die beide Begriffe miteinander in Beziehung setzen. Diese Kritiken politischer Gefühle führen zu einem Ansatz der Selbst-Bildung, ...
Aufsatz
Wer leidet in der Sozialen Arbeit an Erschöpfung? Ergebnisse einer Repräsentativerhebung
(2023-06-05)
Nach der internationalen Studienlage weisen Sozialarbeitende ein hohes berufsspezifisches Risiko für die Entwicklung von Disstress, Erschöpfung und Burnout auf. Gemäß dem Modell der Arbeitsanforderungen und -ressourcen (JD-R) führen hohe oder schlechte Arbeitsanforderungen zu Erschöpfung. In Deutschland besteht ein Forschungsdefizit zur Gesundheit von Sozialarbeitenden. Ziel der Untersuchung ist es, innerhalb der Sozialen Arbeit gefährdete Personengruppen unter Berücksichtigung von berufsspezifischen Einflussfaktoren ...
Buch
Die Politische Ökonomie des Steuerstaates in Rentengesellschaften
(Nomos, 2023)
Die lateinamerikanischen Gesellschaften sind historisch von einer obszönen Ungleichheit geprägt und werden immer wieder von schweren Finanzkrisen erschüttert. Am Beispiel Argentiniens geht das Buch den systematischen Gründen für den Verzicht auf eine gezielte Besteuerung von Reichtum durch die lateinamerikanischen Regierungen der sogenannten Linkswende nach. Mit seinem rententheoretischen Zugang zu einer materialistischen Staats- und Gesellschaftstheorie des Steuerstaats leistet das Buch einen neuen Beitrag zur Debatte ...