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Articles 541 - 550 of 550
Full-Text Articles in Entire DC Network
White Pine Weevil Response To Oak Overstory Girdling - Results From A 16-Year-Old Study, S.A. Katovich, F.S. Morse
White Pine Weevil Response To Oak Overstory Girdling - Results From A 16-Year-Old Study, S.A. Katovich, F.S. Morse
Aspen Bibliography
No abstract provided.
Is General Relativity An "Already Parametrized" Theory?, Charles G. Torre
Is General Relativity An "Already Parametrized" Theory?, Charles G. Torre
All Physics Faculty Publications
Beginning with the work of Dirac and of Arnowitt, Deser, and Misner in the late 1950s and early 1960s, and then after subsequent development by Kuchař, the canonical dynamical structure of general relativity has often been viewed as that of a parametrized field theory in which the many-fingered spacetime variables are hidden among the geometrodynamical field variables. This paradigm of general relativity as an "already parametrized" theory forms the basis for one of the most satisfactory resolutions of the problems of time and observables in classical and quantum gravity. However, despite decades of effort, no identification of many-fingered spacetime variables …
Ionospheric Simulation Compared With Dynamics Explorer Observations For November 22, 1981, Jan Josef Sojka, M. D. Bowline, Robert W. Schunk, J. D. Craven, L. A. Frank, J. R. Sharber, J. D. Winningham, L. H. Brace
Ionospheric Simulation Compared With Dynamics Explorer Observations For November 22, 1981, Jan Josef Sojka, M. D. Bowline, Robert W. Schunk, J. D. Craven, L. A. Frank, J. R. Sharber, J. D. Winningham, L. H. Brace
All Physics Faculty Publications
Dynamics Explorer (DE) 2 electric field and particle data have been used to constrain the inputs of a time-dependent ionospheric model (TDIM) for a simulation of the ionosphere on November 22, 1981. The simulated densities have then been critically compared with the DE 2 electron density observations. This comparison uncovers a model-data disagreement in the morning sector trough, generally good agreement of the background density in the polar cap and evening sector trough, and a difficulty in modelling the observed polar F layer patches. From this comparison, the consequences of structure in the electric field and precipitation inputs can be …
Analysis Of Experiments In Helium Microbeam Mixing, J B. Davis, R E. Benenson, David Peak
Analysis Of Experiments In Helium Microbeam Mixing, J B. Davis, R E. Benenson, David Peak
All Physics Faculty Publications
We have continued to investigate ion-beam mixing in bilay-er targets irradiated by 2-MeV He+ microbeams at room temperature. Although we have previously reported a linear dependence of interface width on dose for Cu/Al targets 1, more extensive results have not supported this conclusion, within statistical uncertainty, it appears that the interface width in Cu/Al (1) is proportional to the square root of dose, at constant dose rate, (2) is larger in Al than in Cu, for the same dose, (3) is proportional to the 1/4 power of dose rate, and (4) is absent at liquid nitrogen temperature. Calculations …
Su(3) X Su(2) X U(1)Su(3): The Residual Symmetry Of Conformal Gravity, James Thomas Wheeler
Su(3) X Su(2) X U(1)Su(3): The Residual Symmetry Of Conformal Gravity, James Thomas Wheeler
All Physics Faculty Publications
SUe 4) x SU(2) is shown to characterize the possible choices of spacetime metric constructible from the gauge fields of the conformal group. When this symmetry is broken by the choice of metric, exactly the SU(3) x SU(2) x U(l) symmetry of the standard model remains. The conformal group consists of Lorentz transformations, translations, inverse translations and dilations. Treated in the standard way, conformal symmetry fails as a unifying gauge group: dilations make the mass spectrum continuous, and the inverse translational gauge field is auxiliary. The theory reduces back to the Poincare group.
Cambial Electrical Resistance Does Not Assess Vitality Of Individual Sweetgum Trees, James R. Clark, Roger Kjelgren, J. Hushagen, J. Fiore
Cambial Electrical Resistance Does Not Assess Vitality Of Individual Sweetgum Trees, James R. Clark, Roger Kjelgren, J. Hushagen, J. Fiore
Plants, Soils, and Climate Faculty Publications
Cambial electrical resistance (CER) was assessed over a year-long period, using the Shigometer, for 109 sweetgum trees (Liquidambarstyraciflua) planted along streets in Seattle, Washington. CER decreased through the spring, reached a minimum in summer, increased through the fall and was maximal in mid-winter. The seasonal maximum was 200-600% greater than the summer minimum. CER measurements could not be related to growth parameters such as seasonal shoot increment and diameter growth.
Estimation Of Shrub Leaf Biomass Available To White-Tailed Deer, Lynn Rogers, Ronald E. Mcroberts
Estimation Of Shrub Leaf Biomass Available To White-Tailed Deer, Lynn Rogers, Ronald E. Mcroberts
Aspen Bibliography
No abstract provided.
Compositions Of Bud And Leaf Exudates Of Some Populus Species, W. Greenaway, J. May, T. Scaysbrook, F.R. Whatley
Compositions Of Bud And Leaf Exudates Of Some Populus Species, W. Greenaway, J. May, T. Scaysbrook, F.R. Whatley
Aspen Bibliography
Bud and leaf exudates from Populus alba, P. balsam ifera, P. nigra and P. tremuloides were analyzed by gas chromatography/mass spectrometry and their components were identified. For three of the four species, P. alba, P. balsam ifera and P. nigra, the bud and leaf exudates were similar within each species, though there were marked differences between species. Bud and leaf exudates of P. alba contained only hydrocarbons, those of P. balsam ifera contained primarily dihydrochalcones and those of P. nigra contained primarily caffeic acid esters. Bud and leaf exudates of P. tremuloides were different both from each other and from …
Cliff Lake Bench Research Natural Area: Problems Encountered In Monitoring Vegetation Change On Mountain Grasslands, Walter F. Mueggler
Cliff Lake Bench Research Natural Area: Problems Encountered In Monitoring Vegetation Change On Mountain Grasslands, Walter F. Mueggler
Aspen Bibliography
No abstract provided.
Armillaria Root Rot In The Canadian Prairie Provinces, K. I. Mallett
Armillaria Root Rot In The Canadian Prairie Provinces, K. I. Mallett
Aspen Bibliography
No abstract provided.