Matches in SemOpenAlex for { <https://semopenalex.org/work/W4255013453> ?p ?o ?g. }
Showing items 1 to 65 of
65
with 100 items per page.
- W4255013453 endingPage "443" @default.
- W4255013453 startingPage "439" @default.
- W4255013453 abstract "It is well known that Fresnel zone plates act as a lens with a focal length inversely proportional to the wavelength. At Professor Moellenstedt's Institute of Applied Physics in Tübingen, a technique has been developed to manufacture micro-zone plates electronoptically from Buckbee-Mears zone plates. These micro-zone plates have a diameter of 0·5 mm approximately, 38 zones and a focal length of 30 cm for X-rays of nearly 50 Å. Their resolving power is of the order of a few seconds of arc (Einighammer et al. , 1966). One finds, however, experimentally as well as theoretically that the sharply defined image is surrounded by a halo having a diameter of a few minutes of arc for the above-mentioned zone plates. Whereas for a point source the intensity of a halo is poor and therefore unimportant, for extended sources it becomes large as a result of the superposition of the contributions from the individual points of the source. This has been demonstrated by the photometer curves of the images of circular sources by Einighammer (1966) (Figure 1). The halo is not noticeable in case of very narrow sources (curves a and b ). With increasing diameter of the source the intensity of the halo rapidly increases (curves c and d ). For the same source the brightness distribution of the halo agrees practically with the one obtained by a pinhole camera, provided the diameter of the hole and that of the zone plate are equal; these brightness distributions are represented by the dashed lines c′ d′ in Figure 1." @default.
- W4255013453 created "2022-05-12" @default.
- W4255013453 creator A5008252593 @default.
- W4255013453 date "1968-01-01" @default.
- W4255013453 modified "2023-09-26" @default.
- W4255013453 title "X-ray picture of the Sun taken with Fresnel zone plates" @default.
- W4255013453 cites W2000421111 @default.
- W4255013453 doi "https://doi.org/10.1017/s0074180900021884" @default.
- W4255013453 hasPublicationYear "1968" @default.
- W4255013453 type Work @default.
- W4255013453 citedByCount "0" @default.
- W4255013453 crossrefType "journal-article" @default.
- W4255013453 hasAuthorship W4255013453A5008252593 @default.
- W4255013453 hasBestOaLocation W42550134531 @default.
- W4255013453 hasConcept C103783831 @default.
- W4255013453 hasConcept C120665830 @default.
- W4255013453 hasConcept C121332964 @default.
- W4255013453 hasConcept C125245961 @default.
- W4255013453 hasConcept C15336307 @default.
- W4255013453 hasConcept C184665706 @default.
- W4255013453 hasConcept C200292535 @default.
- W4255013453 hasConcept C207114421 @default.
- W4255013453 hasConcept C27753989 @default.
- W4255013453 hasConcept C2776700484 @default.
- W4255013453 hasConcept C32623475 @default.
- W4255013453 hasConcept C44870925 @default.
- W4255013453 hasConcept C62520636 @default.
- W4255013453 hasConcept C6260449 @default.
- W4255013453 hasConcept C82552819 @default.
- W4255013453 hasConcept C98444146 @default.
- W4255013453 hasConceptScore W4255013453C103783831 @default.
- W4255013453 hasConceptScore W4255013453C120665830 @default.
- W4255013453 hasConceptScore W4255013453C121332964 @default.
- W4255013453 hasConceptScore W4255013453C125245961 @default.
- W4255013453 hasConceptScore W4255013453C15336307 @default.
- W4255013453 hasConceptScore W4255013453C184665706 @default.
- W4255013453 hasConceptScore W4255013453C200292535 @default.
- W4255013453 hasConceptScore W4255013453C207114421 @default.
- W4255013453 hasConceptScore W4255013453C27753989 @default.
- W4255013453 hasConceptScore W4255013453C2776700484 @default.
- W4255013453 hasConceptScore W4255013453C32623475 @default.
- W4255013453 hasConceptScore W4255013453C44870925 @default.
- W4255013453 hasConceptScore W4255013453C62520636 @default.
- W4255013453 hasConceptScore W4255013453C6260449 @default.
- W4255013453 hasConceptScore W4255013453C82552819 @default.
- W4255013453 hasConceptScore W4255013453C98444146 @default.
- W4255013453 hasLocation W42550134531 @default.
- W4255013453 hasOpenAccess W4255013453 @default.
- W4255013453 hasPrimaryLocation W42550134531 @default.
- W4255013453 hasRelatedWork W11151578 @default.
- W4255013453 hasRelatedWork W14981178 @default.
- W4255013453 hasRelatedWork W15812849 @default.
- W4255013453 hasRelatedWork W29092641 @default.
- W4255013453 hasRelatedWork W42036400 @default.
- W4255013453 hasRelatedWork W4224448 @default.
- W4255013453 hasRelatedWork W48556664 @default.
- W4255013453 hasRelatedWork W51209491 @default.
- W4255013453 hasRelatedWork W1385 @default.
- W4255013453 hasRelatedWork W17033749 @default.
- W4255013453 hasVolume "35" @default.
- W4255013453 isParatext "false" @default.
- W4255013453 isRetracted "false" @default.
- W4255013453 workType "article" @default.