Zugschwellverhalten von offenen Spiralseilen

Steel wire ropes are manufactured with non‐detachable terminations such as sockets and swage terminals. Swage terminals are elegant in design and offer an entire range of alternative connectors. Cable constructions are subjected to static as well as dynamic loads. Due to non‐uniform methods of analysis, those test results cannot be directly applied to other rope constructions and terminations. Current standards define endurance loads for certain rope types. There are neither standards nor technical rules available for the common application of swage terminals. For dimension it is necessary to specify the fatigue conditions considering stress and amplitude dependent upon swage parameter and material. The termination is a considerable influence to the fatigue behaviour of steel wire ropes. This article presentes the results of the research project “comparison of fatigue properties for steel wire ropes with swage terminals manufactured from diverse materials” The project was supported by AiF, the German Federation of Industrial Research Associations “Otto von Guericke” e.V.     

Türme unter Glocken‐ und Erdbebenlast nach alter und neuer DIN 4178 und 4149

Towers under Bell and Earthquake Loads according to the old and new DIN 4178 and 4149 Due to their slenderness and their function bell towers are especially exposed to dynamic loads. These loads are the dynamic loads due to the ringing of the bells (DIN 4178 of 1978) and earthquake loads (DIN 4149 of 1981). The two for these load cases relevant codes have been updated to the current technical state of knowledge and have been published in April 2005. In this article the differences between the old and new versions of the codes are explained by two selected examples. The consequences of rehabilitation measures of the bells are also considered. It was found that the new versions of the codes lead to higher loads of the towers. To design new towers and to investigate existing ones it is therefore required to use the updated versions of the codes to obtain reliable results.     

Guerickes Versuch mit den Großen Magdeburger Halbkugeln und den Pferden

Guericke's experiment with the Great Magdeburg Hemispheres and the horses - Comments to the history and to the experiment The Magdeburg hemispheres were invented by German natural scientist and mayor of Magdeburg, Otto von Guericke, to demonstrate the existence of vacuum and the power of atmospheric pressure. The experiment with the great Magdeburg hemispheres and the horses is one of the best-known vacuum experiments in the world. In the year 1657 was the first presentation in Magdeburg, three years after the Reichstag in Regensburg 1654. In the present paper it is shown again the historical proof, based on the exchange of letters between Guericke und Schott, published in his book “Technica Curiosa”, 1664. This of course meant that the first presentation of the famous vacuum experiment with the 16 horses in Regensburg was in the year 2004, demonstrated by the Otto-von-Guericke-Gesellschaft Magdeburg. The contribution gives some basics and practical experiences of about 160 experiments.     

Self-Supervised Model Adaptation for Multimodal Semantic Segmentation

International Journal of Computer Vision - Learning to reliably perceive and understand the scene is an integral enabler for robots to operate in the real-world. This problem is inherently...     

Pinning of the Fermi Level in CuFeO2 by Polaron Formation Limiting the Photovoltage for Photochemical Water Splitting

CuFeO₂ is recognized as a potential photocathode for photo(electro)chemical water splitting. However, photocurrents with CuFeO₂‐based systems are rather low so far. In order to optimize charge carrier separation and water reduction kinetics, defined CuFeO₂/Pt, CuFeO₂/Ag, and CuFeO₂/NiO_x(OH)_y heterostructures are made in this work through a photodeposition procedure based on a 2H CuFeO₂ hexagonal nanoplatelet shaped powder. However, water splitting performance tests in a closed batch photoreactor show that these heterostructured powders exhibit limited water reduction efficiencies. To test whether Fermi level pinning intrinsically limits the water reduction capacity of CuFeO₂, the Fermi level tunability in CuFeO₂ is evaluated by creating CuFeO₂/ITO and CuFeO₂/H₂O interfaces and analyzing the electronic and chemical properties of the interfaces through photoelectron spectroscopy. The results indicate that Fermi level pinning at the Fe³⁺/Fe²⁺ electron polaron formation level may intrinsically prohibit CuFeO₂ from acquiring enough photovoltage to reach the water reduction potential. This result is complemented with density functional theory calculations as well.     

Nature and Size of Included Guest Molecule Determines Architecture of Crystalline Cyclodextrin Host Matrix

Owing to its annular shape, the cyclic hexasaccharide α-cyclodextrin (α-CD) can form inclusion complexes in aqueous solution. If these are crystallized, the guest molecules are invariably accommodated in the cavities of the host. Depending on size and molecular or ionic character of the guest, different crystal modifications are formed belonging to the herringbone or brick-type cage structures or to the channel structures. Small molecular guests lead to herringbone cages, small aromatic guests crystallize in brick-type cages whereas ionic and long molecular guests are enclosed in infinite channels. Thus, there is a clear dependence of crystal packing on the physical properties of the guest molecule. Polyiodide cocrystallizes with α-CD in different channel forms with iodine atoms arranged linearly in the channels. The packing of the channels is in tetragonal, hexagonal or sheet-like arrays, depending on counterions which are located in voids between the channels. If a α-CD is replaced by the larger β-CD (channel diameters 5 and 6.2 Å resp.), polyiodide now adopts a zigzag structure — a clear case of an influence of host matrix geometry on guest configuration.     

Auf dem Weg zur „ökonomischen Indikation“ zum Schwangerschaftsabbruch bei therapierbaren Erbleiden?

Definition of the problem:

The development of substitution therapies for enzyme defects has fundamentally improved the prognosis and quality of life of affected patients, but such treatments are extremely costly. In recessive diseases of that type, there is a high risk for future siblings of an affected child of depending on the same kind of expensive treatment.

Arguments:

With respect to the ongoing debate about the allocation of healthcare resources, prospective carrier parents resp. pregnant women tend to be urged to restrain from further children or to terminate a pregnancy with an affected fetus. Currently, such an "economic indication" for termination appears remote for legal reasons as well as under the ethical aspect of individual procreative freedom. In the near future, however, social pressure as well as possible a-priori denials of coverage by private health insurers for future children of carrier parents may undermine the decision autonomy of parents of children with treatable hereditary diseases.