291 research outputs found
On Quantum Algorithms for Noncommutative Hidden Subgroups
Quantum algorithms for factoring and discrete logarithm have previously been
generalized to finding hidden subgroups of finite Abelian groups. This paper
explores the possibility of extending this general viewpoint to finding hidden
subgroups of noncommutative groups. We present a quantum algorithm for the
special case of dihedral groups which determines the hidden subgroup in a
linear number of calls to the input function. We also explore the difficulties
of developing an algorithm to process the data to explicitly calculate a
generating set for the subgroup. A general framework for the noncommutative
hidden subgroup problem is discussed and we indicate future research
directions.Comment: 13 pages, no figures, LaTeX2
A Quantum Observable for the Graph Isomorphism Problem
Suppose we are given two graphs on vertices. We define an observable in
the Hilbert space \Co[(S_n \wr S_2)^m] which returns the answer ``yes'' with
certainty if the graphs are isomorphic and ``no'' with probability at least
if the graphs are not isomorphic. We do not know if this observable
is efficiently implementable.Comment: 5 pages, no figure
Evaluation of macrophyte control in 38 Florida lakes using triploid grass carp
Floridaâs large number of shallow lakes, warm climate and
long growing season have contributed to the development of
excessive growths of aquatic macrophytes that have seriously
interfered with many water use activities. The introduction
of exotic aquatic macrophyte species such as hydrilla (
Hydrilla
verticillata
) have added significantly to aquatic plant problems
in Florida lakes. The use of grass carp (
Ctenopharyngodon
idella
) can be an effective and economical control for aquatic
vegetation such as hydrilla. Early stocking rates (24 to 74
grass carp per hectare of lake area) resulted in grass carp
consumption rates that vastly exceeded the growth rates of
the aquatic plants and often resulted in the total loss of all
submersed vegetation. This study looked at 38 Florida lakes
that had been stocked with grass carp for 3 to 10 years with
stocking rates ranging from < 1 to 59 grass carp per hectare
of lake and 1 to 207 grass carp per hectare of vegetation to
determine the long term effects of grass carp on aquatic macrophyte
communities. The median PAC (percent area coverage)
value of aquatic macrophytes for the study lakes after
they were stocked with grass carp was 14% and the median
PVI (percent volume infested) value of aquatic macrophytes
was 2%. Only lakes stocked with less than 25 to 30 fish per
hectare of vegetation tended to have higher than median
PAC and PVI values. When grass carp are stocked at levels of
> 25 to 30 fish per hectare of vegetation the complete control
of aquatic vegetation can be achieved, with the exception of
a few species of plants that grass carp have extreme difficulty
consuming. If the management goal for a lake is to control
some of the problem aquatic plants while maintaining a
small population of predominately unpalatable aquatic
plants, grass carp can be stocked at approximately 25 to 30
fish per hectare of vegetation
Charles Baxterâs âGryphonâ: A Postmodernist Substitute in a Traditional Classroom
Cet article Ă©tudie la nouvelle « Gryphon » de Charles Baxter en la plaçant dans le cadre de lâhistoire intellectuelle et pĂ©dagogique allant de lâĂąge des LumiĂšres en Europe au dĂ©veloppement du postmodernisme. Le subjectivisme dâEmmanuel Kant est perçu comme le dĂ©but dâune transition de lâabsolu vers le relatif, en ce qui concerne lâĂ©valuation de ce que lâon prĂ©sente en classe comme des « faits ». Traditionnellement, cette transition kantienne se manifeste bien plus tard, au moment de lâĂ©mergence des idĂ©es postmodernistes issues de lâĂ©chec des thĂ©ories positivistes, et câest prĂ©cisĂ©ment cette transition qui est au centre des Ă©vĂšnements qui constituent le rĂ©cit. Dans le but dâillustrer la façon dont Baxter se sert de la situation en classe pour dĂ©crire une confrontation de perspectives philosophiques et pĂ©dagogiques, on sâappuiera ici sur la thĂ©orie de la rĂ©ception. Lâhistoire de Baxter ne peut ĂȘtre rĂ©duite Ă de simples oppositions de type « noir ou blanc », car lâauteur tente de reflĂ©ter lâimportante subtilitĂ© des complexitĂ©s que lâon rencontre dans les « vraies » classes
Managing Pig Feed Costs in Niche Pork Production
The rising price of corn has created increased interest in alternative feedstuffs by livestock producers, and niche market pork producers are no exception. Unfortunately, there is currently no single replacement for corn in Midwest pig diets, even at todayâs market prices. Thus, managing factors that you can more easily control is critical for continued success in pork production
SIVdrl detection in captive mandrills: are mandrills infected with a third strain of simian immunodeficiency virus?
A pol-fragment of simian immunodeficiency virus (SIV) that is highly related to SIVdrl-pol from drill monkeys (Mandrillus leucophaeus) was detected in two mandrills (Mandrillus sphinx) from Amsterdam Zoo. These captivity-born mandrills had never been in contact with drill monkeys, and were unlikely to be hybrids. Their mitochondrial haplotype suggested that they descended from founder animals in Cameroon or northern Gabon, close to the habitat of the drill. SIVdrl has once before been found in a wild-caught mandrill from the same region, indicating that mandrills are naturally infected with a SIVdrl-like virus. This suggests that mandrills are the first primate species to be infected with three strains of SIV: SIVmnd1, SIVmnd2, and SIVdrl
Feeding Bioenergy Coproducts to Swine: Crude Glycerol
Biodiesel can be produced from a variety of fats and oils. Soybean oil is the primary feedstock in Iowa. In general, soybean oil is mixed with an alcohol (usually methanol) and a catalyst. The action of the alcohol and catalyst cause the oil (triacylglyceride) molecules to be broken down into methyl esters (biodiesel) and crude glycerol. Crude glycerol is the principal co-product of biodiesel production. For every gallon of biodiesel produced, 0.7 pounds of crude glycerol are co-generated.
Biodiesel sales in the United States have increased rapidly since 1999 and annual production capacity in the U.S. is nearly 1.4 billion gallons. Iowa has 11 operating plants with 3 additional plants expected to be operational by December 2007. Production capacity in Iowa for biodiesel is 318.5 million gallons. Approximately 110,000 tons of crude glycerol could be generated annually by the biodiesel plants within Iowa
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