40,624 research outputs found
Thermosonic flip chip interconnection using electroplated copper column arrays
Published versio
Modelling Interdependent Cascading Failures in Real World Complex Networks using a Functional Dependency Model
Infrastructure systems are becoming increasingly complex and interdependent. As a result our ability to predict the
likelihood of large-scale failure of these systems has significantly diminished and the consequence of this is that we
now have a greatly increased risk of devastating impacts to society.
Traditionally these systems have been analysed using physically-based models. However, this approach can only
provide information for a specific network and is limited by the number of scenarios that can be tested. In an attempt
to overcome this shortcoming, many studies have used network graph theory to provide an alternative analysis
approach. This approach has tended to consider infrastructure systems in isolation, but has recently considered
the analysis of interdependent networks through combination with percolation theory. However, these studies have
focused on the analysis of synthetic networks and tend to only consider the topology of the system.
In this paper we develop a new analysis approach, based upon network theory, but accounting for the hierarchical
structure and functional dependency observed in real world infrastructure networks. We apply this method to two
real world networks, to show that it can be used to quantify the impact that failures within an electricity network have
upon a dependent water network
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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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