Changes between Version 436 and Version 437 of AstroTechTalk

Timestamp:

18 Oct 2019, 08:37:59 (5 years ago)

Author:

Ralph Hofferbert

Comment:

--

AstroTechTalk

@@ -31 +31 @@
 || '''11.10.2019[[BR]](11hrs, MPIA Hoersaal)''' || '''Jonathan Crass [[BR]](University of Notre Dame, USA)''' || '''Finding Earth-like planets among the noise - [[BR]]Achieving precision radial velocity measurements with single-mode fibres'''[[BR]][[BR]]Today's  radial velocity (RV) instruments for planet detection are primarily  seeing-limited instruments fed using multi-mode fibres. This design,  while previously state-of-the art, leads to systematic errors which is  beginning to limit our ability to study some of the most challenging,  and consequently most interesting planetary systems. In the era of  adaptive optics at large telescope facilities worldwide, it is now  possible to inject a diffraction-limited input into single-mode optical  fibres to feed next generation RV spectrographs. These have a reduced  instrument volume, a stable input source, and can offer improved overall  stability and precision for RV over their multi-mode fed counterparts.[[BR]][[BR]]iLocater  is a next-generation precision RV spectrograph under development for  the Large Binocular Telescope (LBT). It is one of the first astronomical  spectrographs to use single-mode fibres for precision radial velocity  measurement and will provide high resolution (R~150,000-240,000) NIR  spectra in a stable environment. Jonathan Crass will present an overview of the  instrument, its current status and novel science programs.[[BR]][[BR]]Presentation: English[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2019S2/2019-10-11_iLocator.pdf Slides: English] [[BR]]Questions: German, English ||
 || 18.10.2019 || || ||
-|| '''25.10.2019[[BR]](Time TBD, Room TBD)''' || '''Michael Boehm [[BR]](ISYS Stuttgart)''' || '''Active adjustment of supporting structures for buildings and telescopes[[BR]]'''[[BR]]Abstract[[BR]][[BR]]Presentation: German[[BR]]Slides: English [[BR]]Questions: German, English ||
+|| '''25.10.2019[[BR]](11hrs, MPIA Hoersaal)''' || '''Michael Boehm [[BR]](ISYS Stuttgart)''' || '''Ultralightweight and Adaptive Structures – a Technology for Tomorrow’s Telescopes and Instruments?'''[[BR]][[BR]] Lightweight structures have become a reality for many mass-sensitive applications, such as airplane body design, car body design, or large civil engineering structures. For passive structures, these designs present in most cases a minimum in terms of required mass under given safety limitations and user comfort constraints.[[BR]][[BR]]However, it is possible to stay within these limits and reduce the total embodied mass even further by introducing active structures, which we refer to as ''ultralightweight design''. Through their various actuators, these structures can adapt to external loads and disturbances, thus increasing the utilization of the structure and its elements, which leads to even lighter designs.[[BR]][[BR]]In light of the expected construction activities within the next 20-30 years, this can help saving millions of tons of concrete and steel and significantly reduce waste production and CO,,2,,-emissions of the construction industry. What’s more, the developed methods and ideas can also be applied to any large-scale applications where high masses are critical, such as space flights and airplanes, harbor cranes, ships and even telescopes and their instruments.[[BR]][[BR]] The talk will focus on ideas, methods and results of our research in the context of adaptive ultralightweight structures with a focus on large civil engineering structures. At the end, possible implications of this technology for telescopes and their instruments will be presented.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2019S2/2019-10-25_AdaptiveStructures.pdf Slides: English] [[BR]]Questions: German, English ||
 || 01.11.2019 || -- || All Saints ||
 || 08.11.2019 || || ||