Results 291 to 300 of about 727,698 (345)
Some of the next articles are maybe not open access.
Interchangeability of optical disks
SPIE Proceedings, 1991The aim of this study is to improve interchangeability to ISO standard optical disks. The compensation of the write condition and the expansion of dynamic range of servo circuits using control track data have been tried. The results were satisfactory.
Kunimaro Tanaka +5 more
openaire +2 more sources
Optic Disk Hemorrhages in Glaucoma
American Journal of Ophthalmology, 1994We evaluated the frequency and location of optic disk hemorrhages by examining morphometrically color stereo optic disk photographs of 1,505 glaucomatous eyes and 595 normal eyes. Disk hemorrhages were found in 61 of the glaucomatous eyes (4.1%) and in none of the normal eyes.
Liang Xu, Jost B. Jonas
openaire +2 more sources
Aplasia of the Optic Nerve and Disk
American Journal of Ophthalmology, 1977To clarify the nature of aplasia of the optic nerve and disk, a rare congenital anomaly defined as absence of the optic nerve and disk, retinal ganglion cells, and retinal blood vessels, we evaluated all the cases with this designation in the files.
John J. Weiter +2 more
openaire +3 more sources
The Physics Teacher, 2002
Periodic structures ranging from crystal lattices through steel rulers to radio-antenna arrays may act as diffraction gratings. Because compact disks are so familiar to our students, their use as reflection gratings has become popular.
openaire +2 more sources
Periodic structures ranging from crystal lattices through steel rulers to radio-antenna arrays may act as diffraction gratings. Because compact disks are so familiar to our students, their use as reflection gratings has become popular.
openaire +2 more sources
Optic Disk Edema in Sarcoidosis
American Journal of Ophthalmology, 1979A 24-year-old woman had bilateral optic disk edema. A granulomatous uveitis and macular edema subsequently ensued. Histologic examination of a biopsy specimen taken from an area of marked hilar adenopathy revealed noncaseating epithelioid cell tubercles.
William M. Hart, Ronald M. Burde
openaire +3 more sources
Disk caching with an optical ring
Applied Optics, 2000We propose a simple extension to the optical network of a scalable multiprocessor that optimizes page swap outs. More specifically, we propose to extend the network with an optical ring that not only transfers swapped-out pages between the local memories and the disks of the multiprocessor but also acts as a systemwide write cache for these pages. This
Enrique V. Carrera, Ricardo Bianchini
openaire +3 more sources
The Electronic Library, 1986
Descriptions of optical disk equipment usually begin with terms like CD‐ROM or WORM, leaving the reader to grope for some understanding of what the equipment does. In that frame of mind, it can be difficult to think of creative ways to use the huge capacities offered by optical disks.
openaire +2 more sources
Descriptions of optical disk equipment usually begin with terms like CD‐ROM or WORM, leaving the reader to grope for some understanding of what the equipment does. In that frame of mind, it can be difficult to think of creative ways to use the huge capacities offered by optical disks.
openaire +2 more sources
Applied Optics, 1978
The optics of a video disk player are described. The bandwidth and the playing time of a disk had been specified at 12 MHz and 30 min, respectively. A readout photodetector signal of high quality can be obtained with a well-corrected objective having a numerical aperture of at least 0.4.
Joseph J. M. Braat, G. Bouwhuis
openaire +3 more sources
The optics of a video disk player are described. The bandwidth and the playing time of a disk had been specified at 12 MHz and 30 min, respectively. A readout photodetector signal of high quality can be obtained with a well-corrected objective having a numerical aperture of at least 0.4.
Joseph J. M. Braat, G. Bouwhuis
openaire +3 more sources
Optical Disks And Supercomputers
SPIE Proceedings, 1985OPTICAL DISKS AND SUPERCOMPUTERSKenneth R. WallgrenNASA Headquarters, Code RC, Washington, DC 20546AbstractThe 1990's generation of supercomputers could perform at a computational rate in excess ofa Tera Operation Per Second (TOPS). for these very high performance supercomputers to beeffectively used requires a new generation of peripheral storage ...
openaire +2 more sources
Premastered Optical Disk By Superresolution
Conference Digest Joint International Symposium on Optical Memory and Optical Data Storage 1993, 1993Premastered optical disk by superresolution (PSR) for practical use has been achieved for the first time. The PSR disk has a phase-change material Ge2Sb2Te5 with stoichiometric composition. Superresolution results from a high contrast ratio of reflectance in the light spot between highly reflective crystal region and lowly reflective melted region.
Kouichi Yasuda +4 more
openaire +3 more sources