RESUMO
Here we report successful interferometric coupling of two large telescopes with single-mode fibers. Interference fringes were obtained in the 2- to 2.3-micrometer wavelength range on the star 107 Herculis by using the two Keck 10-meter telescopes, each feeding their common interferometric focus with 300 meters of single-mode fibers. This experiment demonstrates the potential of fibers for future kilometric arrays of telescopes and is the first step toward the 'OHANA (Optical Hawaiian Array for Nanoradian Astronomy) interferometer at the Mauna Kea observatory in Hawaii. It opens the way to sensitive optical imagers with resolutions below 1 milli-arc second. Our experimental setup can be directly extended to large telescopes separated by many hundreds of meters.
Assuntos
Reabsorção Óssea/induzido quimicamente , Ácido Etidrônico/efeitos adversos , Osteíte Deformante/tratamento farmacológico , Osteólise/induzido quimicamente , Articulação do Ombro/diagnóstico por imagem , Feminino , Humanos , Pessoa de Meia-Idade , Osteíte Deformante/complicações , Osteólise/complicações , RadiografiaRESUMO
An ultrastructural and crystallographic study was done on calcium deposits obtained from a patient with the CREST syndrome. Optical microscopy showed that large calcific cutaneous deposits seemed to have developed in a dense connective tissue without any inflammatory reaction. The oldest lesions contained heterotopic bone. Electron microscopy showed that calcium deposit, in the slightly mineralized fibers, was located at the center of the elastic fibers. The calcifications were surgically removed and studies were performed on the rough products and, after heating, using x-ray crystallography, differential thermal analysis and quantitative chemical analysis. Our results showed that this cutaneous calcification is a B type carbonated apatite.
