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Now showing items 1-10 of 177

#### Transient effects in oilfield cementing flows: Qualitative behaviour

(University of Canterbury. Mathematics and Statistics, 2007)

We present an unsteady Hele-Shaw model of the fluid-fluid displacements that take place during primary cementing of an oil well, focusing on the case where one Herschel-Bulkley fluid displaces another along a long uniform ...

#### A characterization for a set of partial partitions to define an X-tree

(University of Canterbury. Mathematics and Statistics., 2002)

Trees whose vertices are partially labelled by elements of a finite
set X provide a natural way to represent partitions of subsets of X. The condition under which a given collection of such partial partitions of X can be ...

#### Optimizing phylogenetic diversity across two trees

(University of Canterbury. Mathematics and Statistics, 2009)

We present a polynomial-time algorithm for finding an optimal set of taxa that maximizes the weighted sum of the phylogenetic diversity across two phylogenetic trees. This resolves one of the challenges proposed as part ...

#### Implementation of Unsteady Sampling Procedures for the Parallel Direct Simulation Monte Carlo Method

(University of Canterbury. Mechanical Engineering., 2008)

An unsteady sampling routine for a general parallel Direct Simulation Monte Carlo
method called PDSC is introduced, allowing the simulation of time-dependent flow
problems in the near continuum range. A post-processing ...

#### Fork-decompositions of matroids

(University of Canterbury. Mathematics and Statistics., 2004)

One of the central problems in matroid theory is Rota's conjecture
that, for all prime powers q, the class of GF(q)-representable matroids has a
finite set of excluded minors. This conjecture has been settled for q ≤ 4 ...

#### Overview of Glycemic Control in Critical Care - Relating Performance and Clinical Results

(University of Canterbury. Mathematics and Statistics.University of Canterbury. Mechanical Engineering., 2007)

Background: Hyperglycemia is prevalent in critical care and tight control can save
lives. Current ad-hoc clinical protocols require significant clinical effort and produce
highly variable results. Model-based methods can ...

#### Unicyclic Networks: Compatibility and Enumeration

(University of Canterbury. Mathematics and Statistics., 2006)

Graphs obtained from a binary leaf labelled (‘phylogenetic’)
tree by adding an edge so as to introduce a cycle provide a
useful representation of hybrid evolution in molecular evolutionary biology.
This class of graphs ...

#### Fast Computation of Supertrees for Compatible Phylogenies with Nested Taxa

(University of Canterbury. Mathematics and Statistics., 2006)

Typically, supertree methods combine a collection of source trees in which just the leaves are labeled by taxa. In such methods the resulting supertree is also leaf labeled. An underlying assumption in these methods is ...

#### Two further links between MP and ML under the Poisson Model

(University of Canterbury. Mathematics and Statistics., 2004)

Maximum parsimony and maximum likelihood are two contrasting approaches for reconstructing phylogenetic trees from sequence and character data. We establish analytic links between these methods (extending connections ...

#### Real-time optimization of an active filter's performance

(University of Canterbury. Electrical and Computer Engineering., 1994)

Recent advances in power electronics have meant
that many loads now draw a distorted current from the power
supply. For the same real power consumed, the apparent power
for the distorted load is greater than the equivalent ...