RESUMO
We present an extreme ultraviolet (EUV) microscope using a Schwarzschild objective which is optimized for single-shot sub-micrometer imaging of laser-plasma targets. The microscope has been designed and constructed for imaging the scattering from an EUV-heated solid-density hydrogen jet. Imaging of a cryogenic hydrogen target was demonstrated using single pulses of the free-electron laser in Hamburg (FLASH) free-electron laser at a wavelength of 13.5 nm. In a single exposure, we observe a hydrogen jet with ice fragments with a spatial resolution in the sub-micrometer range. In situ EUV imaging is expected to enable novel experimental capabilities for warm dense matter studies of micrometer-sized samples in laser-plasma experiments.
RESUMO
This is a retrospective study of 142 stone-formers admitted during 1981 to a general surgical unit of a district hospital. The majority were adult non-Kuwaiti males. Contrary to expectations it was the manual workers from lower economical social strata who were commonly afflicted. The possible reasons for this are discussed. There were no specific biochemical defects in the patients' sera but of 22 patients whose 24-hour urines were examined, half had some abnormality. The majority of IVPs showed some anatomical abnormalities. Calculi were passed spontaneously in nearly half of the patients.
