Physical Sciences and Mathematics Commons^™

The Planet, 1994, Fall, Darren Nienaber, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

A Positive Answer To The Busemann-Petty Problem In 3 Dimensions, Richard J. Gardner

Mathematics Faculty Publications

We prove that in E³ the Busemann-Petty problem, concerning central sections of centrally symmetric convex bodies, has a positive answer. Together with other results, this settles the problem in each dimension.

Landscape Pattern Response To Changes In The Pattern Generation Rules: Land-Use Legacies In Forestry, David O. Wallin, Frederick J. (Frederick John) Swanson, Barbara J. Marks

Environmental Sciences Faculty and Staff Publications

The Pacific Northwest of the United States is currently embroiled in an acrimonious debate over the management of federal forest lands. Constructive resolution of this debate will require better information on a broad range of forest management issues. This study focuses on one such issue: the development of landscape pattern in response to alternative forest cutting plans and the degree to which established landscape patterns can be changed. Dispersed cutting has been conducted on federal lands in the western United States for >40 yr, but alternative cutting plans are now being considered. To assess the effects of different disturbance processes …

Convex-Bodies With Similar Projections, Richard J. Gardner, Aljoša VolčIč

Mathematics Faculty Publications

By examining an example constructed by Petty and McKinney, we show that there are pairs of centered and coaxial bodies of revolution in E^d, d ≥ 3, whose projections onto each two-dimensional subspace are similar, but which are not themselves even affinely equivalent.

On The Busemann-Petty Problem Concerning Central Sections Of Centrally Symmetric Convex-Bodies, Richard J. Gardner

Mathematics Faculty Publications

We present a method which shows that in E³ the Busemann-Petty problem, concerning central sections of centrally symmetric convex bodies, has a positive answer. Together with other results, this settles the problem in each dimension.

The Planet, 1994, Spring, Richard Law, Derek Martin, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Intersection Bodies And The Busemann-Petty Problem, Richard J. Gardner

Mathematics Faculty Publications

It is proved that the answer to the Busemann-Petty problem concerning central sections of centrally symmetric convex bodies in d-dimensional Euclidean space E^d is negative for a given d if and only if certain centrally symmetric convex bodies exist in E^d which are not intersection bodies. It is also shown that a cylinder in E^d is an intersection body if and only if d ≤ 4, and that suitably smooth axis-convex bodies of revolution are intersection bodies when d ≤ 4. These results show that the Busemann-Petty problem has a negative answer for d ≥ 5 …

A Tale Of 2 Continents – Some Tectonic Contrasts Between The Central Andes And The North American Cordillera, As Illustrated By The Paelomagnetic Signatures, Myrl E. Beck Jr., Russ R. Burmester, Robert E. Drake, Paul D. Riley

Geology Faculty Publications

Comparison of patterns of paleomagnetic poles from orogenic belts with appropriate reference poles for the craton can help to delineate important large-scale tectonic processes. Comparison of the paleomagnetic signatures of the western Cordillera of North America and the central Andes shows that the western edges of these belts have had profoundly different Mesozoic and Cenozoic histories. Specifically, the North American Cordilleran pattern shows strong evidence of post-middle Cretaceous relative northward displacement of outboard crustal blocks, but there is almost no comparable evidence of margin-parallel displacement in the Andes. We speculate that this may largely be a consequence of a simple …

Lake Whatcom Monitoring Project 1992/1993 Report, Robin A. Matthews, Geoffrey B. Matthews

Lake Whatcom Annual Reports

This report is part of an on-going series of annual reports and special project reports that document the Lake Whatcom monitoring program.

This work is conducted by the Institute for Watershed Studies and other departments at Western Washington University. The major objective of this program is to provide long-term baseline water quality monitoring in Lake Whatcom and selected tributaries. Each section contains brief explanations about the water quality data, along with discussions of patterns observed in Lake Whatcom.

The Planet, 1994, Winter, Derek Martin, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Downstream Fining In A Mountain Stream Channel Affected By Debris Flow, Craig Emerson Cooper

WWU Graduate School Collection

Grain size of particles tend to become smaller in the downstream direction. Abrasion and selective transport are two sets of processes commonly accepted as explanations for observed trends in fining of sediment. Most recent studies have emphasized the effectiveness of selective transport in producing downstream fining in streams with abundant sediment supply. The contribution of abrasion to particle fining of the coarsest class of particles was investigated in Finney Creek, a high gradient mountain stream in northwest Washington that has a high incidence of sedimentation from debris slides and debris flows. Two dominant rock types comprise the coarsest bed material …

Mesozoic Tectonic Evolution Of The Tiefort Mountains, Ne Mojave Desert, Ca, Kirk A. Stephens

WWU Graduate School Collection

Detailed geologic mapping, petrologic and structural analyses, and U-Pb dating in the Tiefort Mountains, northern Mojave Desert, California, provide constraints on Paleozoic paleogeography and Mesozoic intra-arc tectonics. Geologic mapping in the Tiefort Mountains was used to identify metasedimentary, metaplutonic, and undeformed plutonic rocks. The metasedimentary rocks consist primarily of quartzose schists and gneisses that are correlated with the late-Precambrian Cordilleran miogeoclinal-cratonal sequence of the Johnnie Formation, Stirling Quartzite, and Wood Canyon Formation. Recognition of Precambrian augen gneiss and metasedimentary rocks with miogeoclinal protoliths provides new data on the location of the cratonal-miogeoclinal and miogeoclinal/eugeoclinal paleogeographic boundaries in the Mojave Desert. …