This paper synthesizes various works Wang tiles up to this point, including: the reduction from the Halting Problem to Wang Tiling Problem and notions around various aspects of periodicity, including minimal period, aperiodicity, and axis-aligned periodicity. Additionally it includes new work, including: a proof that a tiling can be periodic...
Weeping alkaligrass (Puccinellia distans) and Nuttall’s alkaligrass (Puccinellia
nuttalliana) infest Kentucky bluegrass seed fields of eastern Oregon. Weeping
alkaligrass is an introduced species from Eurasia, whereas Nuttall’s alkaligrass is
native to semi arid environments of western North America. These species are often
referred to collectively as ‘alkaligrass’; however, for farmers...
The time-averaged velocity field in the North Pacific was estimated in two
sets of inverse calculations. The planetary geostrophic equations were the basis for
dynamical models of the flow in each case. The inverse estimates of the circulation
were obtained by minimizing a positive-definite cost function, which measured the
inconsistency...
Published September 1998. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published September 1998. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
The purpose of this study was to determine the in-service training needs in selected subject matter areas as perceived by community nutrition educators in Kiambu District in Kenya. The study also sought to determine if there were significant relationships between selected demographic characteristics and the respondents' perceptions regarding in-service training...
Archaeological sites located on the western flanks
of the centra1 Oregon Cascades are often characterized
by the lack of temporally diagnostic artifacts and materials
suitable for radiocarbon dating. Consequently, the
temporal context of these sites remains largely unknown.
Various researchers also have suggested that these open-air
lithic sites have been...
The literature asserts that both the medical and educational
communities have forecast a potential for an AIDS
epidemic on college and university campuses. The experts
warn that without either a cure or a vaccine for AIDS, it
is only through education of "risk behaviors" that
devastation can be avoided.
A...
The United States Forest Service's Passport In Time program is designed to involve the public in archaeology on National Forest land. Three of the program's goals are: 1) allow archaeologists to conduct research they would not otherwise have the time or the budget to conduct; 2) teach the public about...