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Aufsatz
Effect of Fibre Material and Fibre Roughness on the Pullout Behaviour of Metallic Micro Fibres Embedded in UHPC
(2020-07-14)
The use of micro fibres in Ultra-High-Performance Concrete (UHPC) as reinforcement increases tensile strength and especially improves the post-cracking behaviour. Without using fibres, the dense structure of the concrete matrix results in a brittle failure upon loading. To counteract this behaviour by fibre reinforcement, an optimal bond between fibre and cementitious matrix is essential. For the composite properties not only the initial surfaces of the materials are important, but also the bonding characteristics ...
Aufsatz
Neither per, nor tim1, nor cry2 alone are essential components of the molecular circadian clockwork in the Madeira cockroach
(2020-08-04)
Circadian clocks control rhythms in physiology and behavior entrained to 24 h light–dark cycles. Despite of conserved general schemes, molecular circadian clockworks differ between insect species. With RNA interference (RNAi) we examined an ancient circadian clockwork in a basic insect, the hemimetabolous Madeira cockroach Rhyparobia maderae. With injections of double-stranded RNA (dsRNA) of cockroach period (Rm´per), timeless 1 (Rm´tim1), or cryptochrome 2 (Rm´cry2) we searched for essential components of the clock´s ...
Aufsatz
Multi-Year High-Voltage Power System Planning Considering Active Power Curtailment
(2020-09-19)
Integrating active power curtailment (APC) of renewable energy sources (RES) in power system planning reduces necessary investments in the power system infrastructure. In current target grid planning methods, APC is considered by fixed curtailment factors without considering the provided flexibility to its full extent. Time-series-based planning methods allow the integration of the time dependency of RES and loads in power system planning, leading to substantial cost savings compared to the worst-case method. In this ...
Aufsatz
Die Entwicklung und Anwendung konfliktspezifischer Geschichtenergänzungsaufgaben als Teil der OPD-Diagnostik im Kindesalter
(2020-02-24)
Die Studie verbindet die MacArthur Story Stem Battery (MSSB) mit der Operationalisierten Psychodynamischen Diagnostik im Kindes- und Jugendalter (OPD-KJ-2). Dargestellt wird die Entwicklung und Anwendung von konfliktspezifischen Geschichtenergänzungsaufgaben für eine systematische Einschätzung der Konflikt- und Strukturachse in der Altersgruppe 2 (6–12 Jahre). Für die Achsen Konflikt und Struktur wird die Interrater-Reliabilität bestimmt. Weiterhin werden explorativ Zusammenhänge zwischen der Konflikt- und Strukturachse ...
Aufsatz
Homodinuclear Rhˡ and Irˡ Complexes Derived from Imidazolium-Benzimidazolates
(2020-11-19)
The reactions of [M(μ-Cl)(COD)]2 (M=Rh, Ir) with the conjugated mesomeric betaines 2-(3-methyl-1-imidazolium)-benzimidazolate (1aH), 2-(3-isopropyl-1-imidazolium)-benzimidazolate (1bH) and 2-(3-tert-butyl-1-imidazolium)-benzimidazolate (1cH) in equilibrium with their carbenic tautomers 1’aH, 1’bH and 1’cH were investigated. In the case of 1aH and 1bH, the homodinuclear complexes [MCl(COD){M(μ-1’a)(COD)}] and [MCl(COD){M(μ-1’b)(COD)}] were obtained, whose anionic NHC ligand 1’a− or 1’b− bridges the metal centres in a ...
Aufsatz
Kötzing, Andreas (Hrsg.): Bilder der Allmacht. Die Staatssicherheit in Film und Fernsehen, 336 S., Wallstein, Göttingen 2018.
(2020-07-13)
Die DDR war nicht gerade ein Staat, der geeignet gewesen wäre, den Glamour Hollywoods anzuziehen. Der Stasi gelang in gewisser Weise allerdings auch dies: Der Mauerbau und die besondere Lage Berlins beflügelten schnell die Fantasien von Filmschaffenden und so entstanden gerade in den 1960er Jahren eine Reihe hochkarätig besetzter Filme, in denen sich etwa Paul Newman („Der zerrissene Vorhang“, 1966) oder Richard Burton („Der Spion, der aus der Kälte kam“, 1965) mit den Machenschaften der Stasi auseinandersetzen ...
Aufsatz
Single-atom heat engine as a sensitive thermal probe
(2020-09-09)
We propose employing a quantum heat engine as a sensitive probe for thermal baths. In particular, we study a single-atom Otto engine operating in an open thermodynamic cycle. Owing to its cyclic nature, the engine is capable of translating small temperature differences between two baths into a macroscopic oscillation in a flywheel. We present analytical and numerical modeling of the quantum dynamics of the engine and estimate it to be capable of detecting temperature differences as small as 2 μK. This sensitivity can ...
Aufsatz
Microstructural and mechanical properties of dissimilar nitinol and stainless steel wire joints produced by micro electron beam welding without filler material
(2020-09-18)
Nitinol is a shape memory and superelastic alloy, respectively, and stainless steels are widely used materials in medical engineering, e.g., for implants and medical instruments. However, due to its high price and poor machinability, there is a high demand for dissimilar welding of nitinol components to stainless steel. During welding of titanium-containing alloys, like nitinol, to ferrous metals like stainless steel, intermetallic phases between titanium and iron may form. These phases are brittle and lead to rapid ...
Aufsatz
Tensions in sustainable warehousing: including the blue-collar perspective on automation and ergonomic workplace design
(2020-05-14)
In many industrial countries, demographic changes towards an aging society go hand in hand with the need for ergonomic workplaces. Therefore, it is necessary to rethink workplace designs and work processes, particularly in industrial professions, such as logistics. As logistics activities are still characterized by a high amount of manual effort, they represent a suitable field for gaining empirical insights into the implementation of automation and ergonomic practices to inform social sustainable warehousing logistics ...
Aufsatz
Different Visualizations Cause Different Strategies When Dealing With Bayesian Situations
(2020-08-21)
People often struggle with Bayesian reasoning. However, previous research showed that people’s performance (and rationality) can be supported by the way the statistical information is represented. First, research showed that using natural frequencies instead of probabilities as the format of statistical information significantly increases people’s performance in Bayesian situations. Second, research also revealed that people’s performance increases through using visualization. We have built our paper on existing ...