Zobrazeno 1 - 10
of 42
pro vyhledávání: '"John F. Meekins"'
Publikováno v:
Applied optics. 28(7)
Zero-order and first-order efficiencies of plane diffraction grazings over the 100-300-A band have been measured using the NRL beamline facility at the National Synchrotron Light Source. Measurements were taken at grating angles of 5, 10, and 15 deg,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::794e5da720c82888c302dee18027e4b8
https://pubmed.ncbi.nlm.nih.gov/20548666
https://pubmed.ncbi.nlm.nih.gov/20548666
Autor:
John F. Meekins
Publikováno v:
Applied optics. 28(6)
Self-supporting transmission gratings suitable for the soft x-ray and extreme ultraviolet must be reinforced by support structures which, if regularly placed, tend to produce undesirable artifacts in the diffraction plane. Because these artifacts app
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbbbf632c086ba4402a5a588ea6ef3c7
https://pubmed.ncbi.nlm.nih.gov/20548643
https://pubmed.ncbi.nlm.nih.gov/20548643
Publikováno v:
Applied optics. 26(6)
A technique is described which allows the thickness of each layer in a layered synthetic microstructure to yield a useful constant efficiency over a broad band of wavelengths, several hundred angstroms wide, in the soft x-ray and EUV wave bands.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c7497070f198c6cfe2865b62bb48c38
https://pubmed.ncbi.nlm.nih.gov/20454257
https://pubmed.ncbi.nlm.nih.gov/20454257
Autor:
John F. Meekins, S. Shulman, E. T. Byram, W. N. Johnson, Talbot A. Chubb, Gerald H. Share, M. Bonnardeau, W. D. Evans, Kent S. Wood, Daryl J. Yentis
Publikováno v:
Nature. 282:692-695
An X-ray survey of three high energy gamma-ray sources in the galactic anticenter region conducted using the large area sky survey instrument on HEAO 1 is presented. The sensitivity of this survey is highest reported, and two, and possibly three, X-r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::945a5ce5691dc75caaef891839f39d06
https://doi.org/10.1038/282692a0
https://doi.org/10.1038/282692a0
Publikováno v:
Solar Physics. 13:198-212
Solar flare spectral data, covering the wavelength range 0.7–8.5 A, are derived from the NRL Bragg crystal spectrometers aboard OSO-4. A detailed analysis of the soft X-ray spectra for the 3b flare of 16 November 1967 (2140 UT) is presented, and it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00f6c6aa035b884393400d51d427dba2
https://doi.org/10.1007/bf00963952
https://doi.org/10.1007/bf00963952
Publikováno v:
Solar Physics. 29:125-141
X-ray spectra of solar flares in the spectral range from 8.5 A to ∼ 16 A have been obtained from a Naval Research Laboratory crystal spectrometer flown on the sixth Orbiting Solar Observatory (OSO-6). A list of emission features is presented and te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::146836853c3c08ecd673603d392fe2fb
https://doi.org/10.1007/bf00153444
https://doi.org/10.1007/bf00153444
Publikováno v:
Science. 162:891-895
Two crystal spectrometers aboard the orbiting solar observatory OSO-4 cover the wavelength ranges 0.5 to 3.9 angstroms and 1.0 to 8.5 angstroms. Within this range, there appear emission lines from hydrogen-like and helium-like states of calcium, sulf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8ccbbf17b820221bd318e4657526808
https://doi.org/10.1126/science.162.3856.891
https://doi.org/10.1126/science.162.3856.891
Autor:
W. D. Evans, Meir Meidav, D. Yentis, Dror Sadeh, Talbot A. Chubb, E. T. Byram, John F. Meekins, Herbert W. Smathers, Kent S. Wood, Herbert Friedman
Publikováno v:
Nature. 278:436-438
CIRCINUS X–1 (4U1516–56) was first detected in 1969 (ref. 1) and has since been studied in X-ray, radio, and optical wavelengths. Particular interest in this source has resulted from its resemblance to Cygnus X–1—a suspected black hole. Both
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32480a4cc7f7d39256ae66012dfbe06a
https://doi.org/10.1038/278436a0
https://doi.org/10.1038/278436a0
Autor:
S. Shulman, E. T. Byram, Gerald H. Share, Herbert Friedman, J. Samimi, Kent S. Wood, D. Yentis, Talbot A. Chubb, John F. Meekins, W. D. Evans
Publikováno v:
Nature. 278:434-436
HEAO-1 observations of aperiodic variability in the galactic X-ray source GX339-4 (4U 1658-48) on time scales of tens of milliseconds to a few seconds are reported. It is shown that the overall characteristics of GX339-4 place it in the same class of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aec7efdf6e9be5753796ea5e6ce03166
https://doi.org/10.1038/278434a0
https://doi.org/10.1038/278434a0
Publikováno v:
Nature. 221:345-347
VERY condensed stars have been suggested as sources of celestial X-rays1,2 and pulsar radio emission3. The fact that the pulsar CP 0950 (ref. 4) falls within the uncertainty in the position of the X-ray source Leo XR-1 (ref. 5) could be significant a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a09720cf7e4a55eecdc23e0cffd4139d
https://doi.org/10.1038/221345a0
https://doi.org/10.1038/221345a0