Eine der größten Anziehungspunkte auf der Insel La Palma ist die Sternwarte. Kein anderer Ort in Europa zieht so viele Hobbyastronomen an.
One of the biggest attractions on the island of La Palma is ...the observatory No other place in Europe attracts so many hobby astronomers.
The Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) is a quasi-meridian reflecting Schmidt telescope laid down on the ground with its optical axis fixed in the meridian plane and ...the telescope will be the one that possesses the highest spectrum acquiring rate in the world. To secure its smooth operation, each component, especially the mirror system needs to be maintained in a good condition. Some equipment is needed and the operation must be considered at early stages. In this paper, a feasible approach is put forward in which the concept of human and machine cooperative work is used to assure the successful operation at lower cost. An electrical driven forklift with some special fixtures designed for this work is used for MB mirror system and a special designed crane is used for the assembly and disassembly of MA mirror system. Procedures and methodologies for the identification of assembly and disassembly sequence, special tool design, time and cost analysis, and human factors analysis of the assembly and disassembly sequence are presented.
Purpose - This paper aims to describe bridge transported servo-manipulator (BTSM) system, which was developed to overcome the limited workspace of the conventional mechanical master-slave ...manipulators in a hot cell.Design methodology approach - The BTSM system consists of four components: a transporter with a telescoping tubeset, a slave manipulator, a master manipulator, and a remote control system. The slave manipulator is able to move horizontally, transversely, and vertically by using the transporter.Findings - The performance test of the BTSM system has been carried out in terms of basic functions such as force threshold, bilateral control and force reflection characteristic.Originality value - With respect to design characteristic, the BTSM system has the novel features in that the individual motor modules or the slave manipulator can be repaired in a fully remote manner in case of catastrophic failure. Also, a 3D viewing camera facilitates remote tasks giving human operators realistic environmental information.
E-ELT: So heißt das neue Teleskop der Europäischen Südsternwarte ESO. Noch arbeiten Wissenschaftler wie Jochen Liske vom ESO in Garching am Himmelsauge der Zukunft. Das soll im kommenden Jahrzehnt in ...Betrieb gehen.
E-elt: This is the name of the new telescope of the European Southern Observatory ESO Scientists like Jochen Liske from ESO in Garching are still working on the sky eye of the future This should be up and running in the coming decade
A section of retrieved Hubble Space Telescope (HST) bi-stem thermal shields (BSTS), which experienced 8.25 years of space exposure, was analyzed for space environmental durability. The shields were ...comprised of 2 mil (0.051 mm) aluminized-Teflon® fluorinated ethylene propylene (Al-FEP) rings fused together into a circular bellows shape. As the circular thermal shields had solar, anti-solar and solar-grazing surfaces and were exposed to the space environment for a long duration, it provided a unique opportunity to study solar effects on the environmental degradation of Al-FEP, a commonly used spacecraft thermal control material. Therefore, the objective of this research was to characterize the degradation of retrieved HST BSTS Al-FEP with particular emphasis on solar effects. Data obtained included tensile properties, density (as-retrieved and after 200 3C heating), solar absorptance, and surface morphology and chemistry. The solar-facing surfaces of the thermal shields were found to be extremely embrittled and contained numerous through-thickness cracks. Tensile testing verified that near solar-facing surfaces lost their mechanical strength and elasticity, whereas the anti-solar-facing surfaces maintained their ductility. The density of the as-retrieved BSTS insulation was similar to pristine FEP. Heating at 200 3C resulted in significant increases in density for the solar-facing BSTS indicating chain scission damage, consistent with the loss of mechanical strength and elongation. The solar absorptance of the solar-grazing and the anti-solar-facing surfaces were found to be similar to pristine BSTS, whereas the solar-facing surfaces were found to have significantly increased solar absorptance. Both solar- and anti-solar-facing surfaces were microscopically textured from sweeping atomic oxygen erosion with the solar-facing surface appearing to have a more pronounced texture in spite of being exposed to a lower atomic oxygen fluence indicating a possible solar/atomic oxygen synergistic effect. These results provide valuable information on space environmental degradation of Al-FEP, particularly with respect to solar radiation effects on embrittlement.
Über 20 Staaten haben sich zu einem globalen Forschungsvorhaben zusammengetan, um das größte Radioastronomieprojekt der Erde aufzubauen und zu betreiben. Rund 3000 vernetzte Parabolantennen werden ...dann über die südliche Hemisphäre - im südliche Afrika und den Indischen Ozean (Australien/Neuseeland) verteilt sein.
Over 20 states have joined forces to form a global research project to build and operate Earth's largest radio astronomy project. Around 3000 networked parabolic antennas will then be spread across the Southern Hemisphere - in Southern Africa and the Indian Ocean (Australia / New Zealand).
E-elt: This is the name of the new telescope of the European Southern Observatory ESO Scientists like Jochen Liske from ESO in Garching are still working on the sky eye of the future This should be ...up and running in the coming decade Today it is already clear that the search for black holes will be one of the tasks of the telescope
E-ELT: So heißt das neue Teleskop der Europäischen Südsternwarte ESO. Noch arbeiten Wissenschaftler wie Jochen Liske vom ESO in Garching am Himmelsauge der Zukunft. Das soll im kommenden Jahrzehnt in Betrieb gehen. Heute steht schon fest, dass die Suche nach schwarzen Löchern eine der Aufgaben des Teleskops sein wird.
Astronomy changes the world view. In addition, an interview with Prof. Dieter Breitschwerdt, Center for Astronomy and Astrophysics, Technical University of Berlin
Die Astronomie verändert das ...Weltbild. Dazu ein Interview mit Prof. Dieter Breitschwerdt, Zentrum für Astronomie und Astrophysik, Technische Universität Berlin.
