منابع مشابه
"Very High Alumina Basalt":
The proposal by Hubbard et al. (1) that "Very High Alumina basalt" ("VHA basalt") may represent an important primary lunar magma type neglects consideration of certain well-characterized high-magnesium highland rocks, among them spinel troctolite from Luna 20 (2) and Apollo 16 samples (3) and dunite from Apollo 17 samples (4), and the possibility that "VHA basalt" may in fact have originated by...
متن کاملLaser intrastromal keratomileusis for high myopia and myopic astigmatism.
BACKGROUND Laser intrastromal keratomileusis (LASIK) is an evolving technique which enables high degrees of myopia (> 8.0 dioptres) and myopic astigmatism to be corrected. This paper describes initial experience with this procedure. It also details the methodology, the results, the problems encountered, and discusses retreatment procedures. METHODS 51 eyes (48 primary cases and three retreatm...
متن کاملCorrection of high astigmatism using LASIK and arcuate keratotomy
We describe the case of a 47-year-old man who came to our center to be assessed for refractive surgery in 2007. The initial scan (instillation of 3 drops of cyclopentolate 1%) revealed a corrected distance visual acuity of 20/60 with +0.50 –9.50 × 10° in OD and 20/60 with +1.25 –9.50 × 165° in OS. We performed laser in situ keratomileusis (LASIK) in both eyes using a bicylindrical approach afte...
متن کاملcross cylinder ablation in lasik for high astigmatism
purpose: to evaluate the visual outcomes of cross-cylinder ablation in laser in situ keratomileusis (lasik) for eyes with high astigmatic refractive errors and low spherical component. methods: we prospectively evaluated cross cylinder lasik in patients with high astigmatic refractive error but low spherical component over a period of 2 years. all procedures were performed with the nidek ec-500...
متن کاملVery High Speed Entropy Coding
Efforts to build high-speed hardware for many different entropy coders are limited by fundamental feedback loops. Here is a method that allows for parallel compression in hardware. This parallelism results in extremely high rates, lo0 million symbolskecond or higher. The system is generalizable to any lossless or lossy system with deterministic decompression. Prototype hardware that divides the...
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ژورنال
عنوان ژورنال: Journal of the American Medical Association
سال: 1899
ISSN: 0002-9955
DOI: 10.1001/jama.1899.92450760027001g