Whales as marine ecosystem engineers Roman, Joe; Estes, James A; Morissette, Lyne ...
Frontiers in ecology and the environment,
September 2014, Letnik:
12, Številka:
7
Journal Article
Recenzirano
Odprti dostop
Baleen and sperm whales, known collectively as the great whales, include the largest animals in the history of life on Earth. With high metabolic demands and large populations, whales probably had a ...strong influence on marine ecosystems before the advent of industrial whaling: as consumers of fish and invertebrates; as prey to other large-bodied predators; as reservoirs of and vertical and horizontal vectors for nutrients; and as detrital sources of energy and habitat in the deep sea. The decline in great whale numbers, estimated to be at least 66% and perhaps as high as 90%, has likely altered the structure and function of the oceans, but recovery is possible and in many cases is already underway. Future changes in the structure and function of the world's oceans can be expected with the restoration of great whale populations.
Group Coding With Complex Isometries Hye Jung Kim; Nation, James B.; Shepler, Anne V.
IEEE transactions on information theory,
2015-Jan., 2015-1-00, 20150101, Letnik:
61, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We investigate group coding for arbitrary finite groups acting linearly on vector spaces. These yield robust codes based on real or complex matrix groups. We give necessary and sufficient conditions ...for correct subgroup decoding using geometric notions of minimal length coset representatives. The infinite family of complex reflection groups G(r, 1, n) produces effective codes of arbitrarily large size that can be decoded in relatively few steps.
We introduce a generalization of symmetric (
v,
k,
λ) block designs, and show how these could potentially be used to construct projective planes of nonprime-power order.
Inherently nonfinitely based lattices Freese, Ralph; McNulty, George F.; Nation, J.B.
Annals of pure and applied logic,
06/2002, Letnik:
115, Številka:
1
Journal Article
Recenzirano
Odprti dostop
We give a general method for constructing lattices
L
whose equational theories are inherently nonfinitely based. This means that the equational class (that is, the variety) generated by
L
is locally ...finite and that
L
belongs to no locally finite finitely axiomatizable equational class. We also provide an example of a lattice which fails to be inherently nonfinitely based but whose equational theory is not finitely axiomatizable.
Term Rewrite Systems for Lattice Theory Freese, Ralph; Ježek, J.; Nation, J.B.
Journal of symbolic computation,
09/1993, Letnik:
16, Številka:
3
Journal Article
Recenzirano
Odprti dostop
It is shown that, even though there is a very well-behaved, natural normal form for lattice theory, there is no finite, convergent AC term rewrite system for the equational theory of all lattices.
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