10 research outputs found
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FABRICATION OF WINDOW SADDLES FOR NIF CRYOGENIC HOHLRAUMS
OAK-B135 A planar diagnostic viewing port attached to the cylindrical wall of the NIF cryogenic hohlraum requires a saddle-like transition piece. While the basic design of this window saddle is straightforward, its fabrication is not, given the scale and precision of the component. They solved the problem through the use of a two segment copper mandrel to electroform the gold window saddle. The segments were micro-machined using a combination of single-point diamond turning and single point diamond milling. These processes as well as the electroplating conditions, final machining and mandrel removal are described in this paper
High Body Mass Index in Adolescent Girls Precedes Psoriasis Hospitalization
Psoriasis is associated with being overweight, but the temporal relationship is not known. This historical cohort study tested whether severe psoriasis resulting in hospitalization in adulthood was preceded by excess increase in age-adjusted body mass index, a known risk factor in childhood for being overweight in adulthood. The study cohort was based on the Copenhagen School Health Records Register, birth years 1930 to 1984 (309,152 schoolchildren). Cases were found through the Danish National Patient Register for the period 1977 to 2001. A total of 1074 (0.36%) of the schoolchildren were identified as having psoriasis, with at least one hospital admission. Multivariate analysis demonstrated an association between excess increase in body mass index and psoriasis in females only. Being overweight in adolescence was the main factor behind this observation. The female group showed a significant association between psoriasis and body mass index at ages 12 (p=0.028) and 13 years (p=0.010). This was not the case for males or for body mass index measured at ages 11 years and below
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PROPERTIES OF SILICON CARBIDE RELEVANT TO ITS PERFORMANCE AS A COATING FOR HIGH TEMPERATURE NUCLEAR FUEL PARTICLES.
Cryogenic target development for fast ignition with Z-pinch-driven fuel assembly
We are developing an alternative approach to
indirect-drive fast ignition fusion targets in which a liquid cryogenic fuel
layer is condensed in situ from a low pressure external gas supply and confined
between a thick outer ablator shell and a thin inner shell. The shape and
surface quality of the liquid fuel layer is determined entirely by the
characteristics of the bounding shells. Liquid fuel targets of this type
have a number of potential advantages including greatly reduced temperature
control requirements and drastically reduced cost and complexity of the
cryogenic support system compared to -layed DT targets. This liquid
fuel concept is particularly appropriate for a hemispherical capsule
configuration with single-sided x-ray drive by a z-pinch source. Technology
issues for concentric-shell liquid cryogenic target development and progress
in thin inner hemispherical shell fabrication are discussed