39,945 research outputs found
Ultraviolet filter
Ultraviolet filter of thorium fluoride and cryolite on quartz bas
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Manufacturing method and performance assessment for variable lead vacuum rotors
In recent years variable lead rotors have been produced, mainly for vacuum applications, involving a multiple pass manufacturing process which is necessarily time-consuming. A faster method of manufacturing such rotors uses a full profiled disc-type milling or grinding tool but involves clearance variations along the length. These effects have been assessed by computer modelling to quantify any disadvantages. The results indicate that the effects on performance are negligible and the profiled disk tool process is suitable for such components
A combinatorial result with applications to self-interacting random walks
We give a series of combinatorial results that can be obtained from any two
collections (both indexed by ) of left and right pointing arrows
that satisfy some natural relationship. When applied to certain
self-interacting random walk couplings, these allow us to reprove some known
transience and recurrence results for some simple models. We also obtain new
results for one-dimensional multi-excited random walks and for random walks in
random environments in all dimensions
Overview of the Tevatron Collider Complex: Goals, Operations and Performance
For more than two decades the Tevatron proton-antiproton collider was the
centerpiece of the world's high energy physics program. The collider was
arguably one of the most complex research instruments ever to reach the
operation stage and is widely recognized for numerous physics discoveries and
for many technological breakthroughs. In this article we outline the historical
background that led to the construction of the Tevatron Collider, the strategy
applied to evolution of performance goals over the Tevatron's operational
history, and briefly describe operations of each accelerator in the chain and
achieved performance.Comment: Includes modifications suggested by reviewer
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