FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1997637954> ?p ?o ?g. }

• W1997637954 abstract "We report on the casting of the first 8.4 meter diameter borosilicate honeycomb mirror at the Steward Observatory Mirror Laboratory. This blank will become the world's largest monolithic glass telescope mirror, and is the first of two mirrors for the large Binocular Telescope Project. The honeycomb 8.4 meter mirror was cast from 21 tons of E6 borosilicate glass manufactured by Ohara. This glass is melted into a mold constructed of aluminosilicate fiber to produce a honeycomb structure with roughly 20% of solid density. The 1662 hexagonal voids that form the honeycomb structure are produced by ceramic fiber boxes bolted to the bottom of the mold with SiC bolts. The furnace rotates at 6.8 rpm during the casting process to produce the F/1.14 paraboloid on the front surface. This shaping minimizes the amount of glass which must be removed during the grinding process. The front faceplate of the mirror will be 28 mm thick after generating and the back faceplate will be 25 mm. The overall thickness of the finished honeycomb blank is 89 cm at the outer edge and 44 cm at the central hole. The first 8.4 meter mirror blank was cast in January 1997. During the casting, two tons of glass leaked from the mold inside the spinning furnace. After a three month annealing cycle the furnace was opened for inspection. As a result of the leakage about 2 square meters of the faceplate near one edge of the mirror was too thin to be polished. In April 1997, an additional two tons of glass was loaded on top of the intact honeycomb structure. In June 1997, after heating slowly back to the annealing temperature, this extra glass was flash melted onto the front of the blank to assure that the faceplate was of sufficient thickness. After a further three month annealing cycle, the furnace was re-opened to reveal a superb casting with low bubble content and little trace of the fusion boundary. The blank has been removed from the furnace using a fixture glued to the upper surface of the blank. It will soon be stripped of its mold material in preparation for polishing." @default.
• W1997637954 created "2016-06-24" @default.
• W1997637954 creator A5001576208 @default.
• W1997637954 creator A5027499957 @default.
• W1997637954 creator A5050148271 @default.
• W1997637954 creator A5053546859 @default.
• W1997637954 creator A5087309464 @default.
• W1997637954 date "1998-08-25" @default.
• W1997637954 modified "2023-10-18" @default.
• W1997637954 title "<title>Casting the first 8.4-m borosilicate honeycomb mirror for the Large Binocular Telescope</title>" @default.
• W1997637954 doi "https://doi.org/10.1117/12.319295" @default.
• W1997637954 hasPublicationYear "1998" @default.
• W1997637954 type Work @default.
• W1997637954 sameAs 1997637954 @default.
• W1997637954 citedByCount "15" @default.
• W1997637954 countsByYear W19976379542012 @default.
• W1997637954 countsByYear W19976379542013 @default.
• W1997637954 countsByYear W19976379542019 @default.
• W1997637954 countsByYear W19976379542020 @default.
• W1997637954 countsByYear W19976379542022 @default.
• W1997637954 crossrefType "proceedings-article" @default.
• W1997637954 hasAuthorship W1997637954A5001576208 @default.
• W1997637954 hasAuthorship W1997637954A5027499957 @default.
• W1997637954 hasAuthorship W1997637954A5050148271 @default.
• W1997637954 hasAuthorship W1997637954A5053546859 @default.
• W1997637954 hasAuthorship W1997637954A5087309464 @default.
• W1997637954 hasConcept C120665830 @default.
• W1997637954 hasConcept C121332964 @default.
• W1997637954 hasConcept C145665481 @default.
• W1997637954 hasConcept C159985019 @default.
• W1997637954 hasConcept C16635281 @default.
• W1997637954 hasConcept C192562407 @default.
• W1997637954 hasConcept C206802598 @default.
• W1997637954 hasConcept C2779710718 @default.
• W1997637954 hasConcept C2780848835 @default.
• W1997637954 hasConceptScore W1997637954C120665830 @default.
• W1997637954 hasConceptScore W1997637954C121332964 @default.
• W1997637954 hasConceptScore W1997637954C145665481 @default.
• W1997637954 hasConceptScore W1997637954C159985019 @default.
• W1997637954 hasConceptScore W1997637954C16635281 @default.
• W1997637954 hasConceptScore W1997637954C192562407 @default.
• W1997637954 hasConceptScore W1997637954C206802598 @default.
• W1997637954 hasConceptScore W1997637954C2779710718 @default.
• W1997637954 hasConceptScore W1997637954C2780848835 @default.
• W1997637954 hasLocation W19976379541 @default.
• W1997637954 hasOpenAccess W1997637954 @default.
• W1997637954 hasPrimaryLocation W19976379541 @default.
• W1997637954 hasRelatedWork W1973101037 @default.
• W1997637954 hasRelatedWork W2029375561 @default.
• W1997637954 hasRelatedWork W2035291927 @default.
• W1997637954 hasRelatedWork W2048831471 @default.
• W1997637954 hasRelatedWork W2055119945 @default.
• W1997637954 hasRelatedWork W2060426627 @default.
• W1997637954 hasRelatedWork W244481090 @default.
• W1997637954 hasRelatedWork W3105386051 @default.
• W1997637954 hasRelatedWork W4244520042 @default.
• W1997637954 hasRelatedWork W4307080922 @default.
• W1997637954 isParatext "false" @default.
• W1997637954 isRetracted "false" @default.
• W1997637954 magId "1997637954" @default.
• W1997637954 workType "article" @default.