In order to regenerate, knee cartilage, paradoxically, needs to be placed under mechanical stress, as happens whenever we take a step and our knees take our weight. When stimulated in this way, the cartilage cells develop receptors that are sensitive to the growth factors produced by the organism.
It is also at this very moment that they would be most receptive to medication. Working on this basis, Dominique Pioletti and Harm-Anton Klok from EPF Lausanne have developed a smart material that only releases a substance when the material is mechanically loaded.Threshold effect
The researchers then wanted to verify that it was actually the heating process resulting from the repetition of the mechanical loading that caused the dye to be released. During an initial experiment, the material was subjected to cyclic mechanical loading but the heat produced was evacuated in order to prevent any local temperature increase in the material. “This test enabled us to exclude a sponge-type function, whereby the dye was only being released as a result of the pressure,” explains Dominique Pioletti. During a second experiment, the nanoparticles were removed. The matrix heated up as expected due to the cyclic mechanical loading but none of the dye was released. The researchers concluded that the three elements of the composite material were required for the system as a whole to function as intended.Long-term prospects
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Glass's off-kilter harmonies
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Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
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Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
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At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
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