Physical Sciences and Mathematics Commons^™

Tr-2007004: Additive Preconditioning, Eigenspaces, And The Inverse Iteration, Victor Y. Pan, Xiaodong Yan

Computer Science Technical Reports

No abstract provided.

Tr-2007006: Realizing Substitution Instances Of Modal Theorems, Melvin Fitting

Computer Science Technical Reports

No abstract provided.

Tr-2007010: Error-Free Computations Via Floating-Point Operations, V. Y. Pan, B. Murphy, G. Qian, R. E. Rosholt

Computer Science Technical Reports

No abstract provided.

Tr-2007007: Independent Component Analysis: An Introduction, Rave Harpaz

Computer Science Technical Reports

No abstract provided.

Tr-2007009: Computations In The Null Spaces With Additive Preprocessing, Victor Y. Pan

Computer Science Technical Reports

No abstract provided.

Tr-2007014: The Schur Aggregation And Extended Iterative Refinement, V. Y. Pan, B. Murphy, R. E. Rosholt

Computer Science Technical Reports

No abstract provided.

Tr-2007015: Justification Logics And Conservative Extensions, Melvin Fitting

Computer Science Technical Reports

No abstract provided.

Tr-2007016: Symmetric Logic Of Proofs, Sergei Artemov

Computer Science Technical Reports

No abstract provided.

Tr-2007017: Linear Logic With Explicit Resources, Hirohiko Kushida

Computer Science Technical Reports

No abstract provided.

Tr-2007019: Justification Logic, Sergei Artemov

Computer Science Technical Reports

No abstract provided.

Tr-2007020: S4lp And Local Realizability, Melvin Fitting

Computer Science Technical Reports

No abstract provided.

Tr-2007025: Public Communication In Justification Logic, Bryan Renne

Computer Science Technical Reports

No abstract provided.

Middle Columbia River Aquatic Nuisance Species Survey, Robyn Draheim, Mark D. Sytsma, Rich Miller, Jeffery Cordell

Center for Lakes and Reservoirs Publications and Presentations

Aquatic nonindigenous species (ANS) in the middle Columbia and lower Snake rivers were surveyed during the summer of 2006. The project area included eight reservoirs and the free-flowing, Hanford Reach on the Columbia River. We also conducted a literature review to create a complete list of ANS for the study area.

Oregon Spartina Response Plan, Mary Pfauth, Mark Sytsma, Dennis Isaacson

Center for Lakes and Reservoirs Publications and Presentations

Four introduced, invasive species of Spartina (cordgrass) have been present in estuarine areas of the U.S. west coast for over a century. These Spartina species are ecological engineers- they cause severe alternations in the hydrology and food webs of invaded estuaries that are detrimental to native wildlife and commercial and recreational uses. Oregon has been relatively free of these weeds, with only two known infestations. One infestation was eradicated by Oregon Department of Agriculture and the other is currently under eradication by The Nature Conservancy.

Synthesis And X-Ray Crystal Structure Of [(C5ph5)Crcl(Μ-Cl)2tl]2: An Example Of The Rare M-X-Tli Linkage (X = Halide), K. Brian Davis, T. David Harris, Michael Castellani, James A. Golen, Arnold L. Rheingold

Chemistry Faculty Research

Reaction of solid TlCl with [(C5Ph5)CrCl(m-Cl)]2 in CH2Cl2 solvent yields the monomeric complex (C5Ph5)CrCl(m-Cl)2Tl in 80% isolated yield. The C5H5 and C5Me5 analogues do not react with TlCl suggesting a steric basis for the reaction of the C5Ph5 material. An X-ray crystal structure of [(C5Ph5)CrCl(m-Cl)2Tl]2•2CH2Cl2 was obtained.

The Journal Of Undergraduate Research: Volume 05

The Journal of Undergraduate Research

This is the complete issue of the South Dakota State University Journal of Undergraduate Research, Volume 5.

Joe Stell's Life, Career, & Contributions, Susan Kelly

Water Matters!

Representative Joe Stell's retirement after 20 years in the New Mexico Legislature has many people wondering: How will we fare without his knowledge and history ofNew Mexico water matters? Stell viewed one of his most important roles as that of helping new legislators get up to speed on w ater issues. We hope that Water Matters! may assist in this role by providing legislators with background information on some of the issues they will encounter. The Utton Center also wanted to acknowledge Joe Stell's outstanding service to New Mexico, and we have therefore included a brief sketch about his career, …

Grand Canyon Reveals Nautiloid Mass Kill Event (Faith & Science Update), John T. Baldwin

Perspective Digest

No abstract provided.

Development Of A High Performance Parallel Computing Platform And Its Use In The Study Of Nanostructures : Clusters, Sheets And Tubes ., S. Gowtham

Dissertations, Master's Theses and Master's Reports - Open

Small clusters of gallium oxide, technologically important high temperature ceramic, together with interaction of nucleic acid bases with graphene and small-diameter carbon nanotube are focus of first principles calculations in this work. A high performance parallel computing platform is also developed to perform these calculations at Michigan Tech. First principles calculations are based on density functional theory employing either local density or gradient-corrected approximation together with plane wave and gaussian basis sets.

The bulk Ga₂O₃ is known to be a very good candidate for fabricating electronic devices that operate at high temperatures. To explore the properties of …

In-Situ Measurement And Characterization Of Cloud Particles Using Digital In-Line Holography, Jacob P. Fugal

Dissertations, Master's Theses and Master's Reports - Open

Satellite measurement validations, climate models, atmospheric radiative transfer models and cloud models, all depend on accurate measurements of cloud particle size distributions, number densities, spatial distributions, and other parameters relevant to cloud microphysical processes. And many airborne instruments designed to measure size distributions and concentrations of cloud particles have large uncertainties in measuring number densities and size distributions of small ice crystals. HOLODEC (Holographic Detector for Clouds) is a new instrument that does not have many of these uncertainties and makes possible measurements that other probes have never made. The advantages of HOLODEC are inherent to the holographic method.

In …

First-Principles Studies Of Boron Nanostructures, Kah Chun Lau

Dissertations, Master's Theses and Master's Reports - Open

Boron is an 'electron deficient' element which has a rather fascinating chemical versatility. In the solid state, the elemental boron has neither a pure covalent nor a pure metallic character. As a result, its vast structural dimensionally and peculiar bonding features hold a unique place among other elements in the periodic table. In order to understand and properly describe these unusual bonding features, a detailed and systematic theoretical study is needed. In this work, I will show that some of the qualitative features of boron nanostructures, including clusters, sheets and nanotubes can easily be extracted from the results of first …

Evolution Of The Southern Kenya Rift From Miocene To Present With A Focus On The Magadi Area, Alexandria L. Guth

Dissertations, Master's Theses and Master's Reports - Open

The Kenya (a.k.a., Gregory) Rift is a geologically active area located within the eastern branch of the larger East African Rift System (EARS). The study area is located in the southern Kenya Rift between 1° South and the Kenya-Tanzania border (covering approximately 1.5 square degrees, semi-centered on Lake Magadi) and is predominantly filled with extrusive igneous rocks (mostly basalts, phonolites and trachytes) of Miocene age or younger. Sediments are thin, less than 1.5Ma, and are confined to small grabens. The EARS can serve both as an analogue for ancient continental rifting and as a modern laboratory to observe the geologic …

Paleoenvironmental Reconstructions From Cave Sediments Of The Moravian Karst, Czech Republic / By Pavel Sroubek., Pavel Sroubek

Dissertations, Master's Theses and Master's Reports - Open

This thesis presents a paleoclimatic/paleoenvironmental study conducted on clastic cave sediments of the Moravian Karst, Czech Republic. The study is based on environmental magnetic techniques, yet a wide range of other scientific methods was used to obtain a clearer picture of the Quaternary climate. My thesis also presents an overview of the significance of cave deposits for paleoclimatic reconstructions, explains basic environmental magnetic techniques and offers background information on the study area – a famous karst region in Central Europe with a rich history.

In Kulna Cave magnetic susceptibility variations and in particular variations in pedogenic susceptibility yield a detailed …

Research Note: The Hazardous Search For Ancestors, Gordon W. Stuart

Maine History

The following is an account of the search for an old family cemetery and the events that impacted the farm on which it was located over a 250 year period. Gordon Stuart, who recorded these events as a way of illustrating the perils and triumphs of genealogical research, is a retired hydrologist with national experience in water quality issues on forest and agriculture land. He volunteers with a lake association, a river watch group, and participates in woodlot education programs in Southern Maine.

A Coastal Transect Of Mcmurdo Dry Valleys (Antarctica) Snow And Firn: Marine And Terrestrial Influences On Glaciochemistry, B. R. Williamson, Karl J. Kreutz, Paul Andrew Mayewski, N. A.N. Bertler, Sharon B. Sneed, M. Handley, D. Introne

Earth Science Faculty Scholarship

Samples of snow and firn from accumulation zones on Clark, Commonwealth, Blue and Victoria Upper Glaciers in the McMurdo Dry Valleys (similar to 77-78 degrees S, 161-164 degrees E), Antarctica, are evaluated chemically and isotopically to determine the relative importance of local (site-specific) factors vs regional-scale influences in defining glaciochemistry. Spatial variation in snow and firn chemistry confirms documented trends within individual valleys regarding major-ion deposition relative to elevation and to distance from the coast. Sodium and methylsulfonate (MS-), for example, follow a decreasing gradient with distance from the coast along the axis of Victoria Valley (350-119 mu gL(-1) for …

Summer Temperature Trend Over The Past Two Millennia Using Air Content In Himalayan Ice, S. Hou, J. Chappellaz, J. Jouzel, P. C. Chu, V. Masson-Delmotte, Dahe Qin, D. Raynaud, Paul Andrew Mayewski, V. Y. Lipenkov, Shichang Kang

Earth Science Faculty Scholarship

Two Himalayan ice cores display a factor-two decreasing trend of air content over the past two millennia, in contrast to the relatively stable values in Greenland and Antarctica ice cores over the same period. Because the air content can be related with the relative frequency and intensity of melt phenomena, its variations along the Himalayan ice cores provide an indication of summer temperature trend. Our reconstruction point toward an unprecedented warming trend in the 20th century but does not depict the usual trends associated with "Medieval Warm Period" (MWP), or "Little Ice Age" (LIA).

Thermal Conditions At The Bed Of The Laurentide Ice Sheet In Maine During Deglaciation: Implications For Esker Formation, Roger Hooke, James Fastook

Earth Science Faculty Scholarship

The University of Maine Ice Sheet Model was used to study basal conditions during retreat of the Laurentide ice sheet in Maine. Within 150 km of the margin, basal melt rates average similar to 5 mm a(-1) during retreat. They decline over the next 100km, so areas of frozen bed develop in northern Maine during retreat. By integrating the melt rate over the drainage area typically subtended by an esker, we obtained a discharge at the margin of similar to 1.2 m(3) s(-1). While such a discharge could have moved the material in the Katahdin esker, it was likely too …

Temperature-Driven Transition From The Wigner Crystal To The Bond-Charge-Density Wave In The Quasi-One-Dimensional Quarter-Filled Band, Rahul Hardikar

Scholarship and Professional Work - LAS

It is known that within the interacting electron model Hamiltonian for the one-dimensional 14-filled band, the singlet ground state is a Wigner crystal only if the nearest-neighbor electron-electron repulsion is larger than a critical value. We show that this critical nearest-neighbor Coulomb interaction is different for each spin subspace, with the critical value decreasing with increasing spin. As a consequence, with the lowering of temperature, there can occur a transition from a Wigner crystal charge-ordered state to a spin-Peierls state that is a bond-charge-density wave with charge occupancies different from the Wigner crystal. This transition is possible because spin excitations …

Hydraulic Considerations For Pipelines Crossing Stream Channels, Jim Fogg, Heidi Hadley

United States Bureau of Land Management: Staff Publications

High flow events have the potential to damage pipelines that cross stream channels, possibly contaminating runoff. A hydrologic analysis conducted during the design of the pipeline can help determine proper placement. Flood frequency and magnitude evaluations are required for pipelines that cross at the surface. There are several methods that can be used, including reconnaissance, physiographic, analytical, and detailed methods. The method used must be appropriate for the site’s characteristics and the objectives of the analysis. Channel degradation and scour evaluations are required for pipelines crossing below the surface. Proper analysis and design can prevent future pipeline damage and reduce …

Airborne Dust Transport To The Eastern Pacific Ocean Off Southern California: Evidence From San Clemente Island, Daniel R. Muhs, James Budahn, Marith Reheis, Jossh Beann, Gary Skipp, Eric Fisher

United States Geological Survey: Staff Publications

Islands are natural dust traps, and San Clemente Island, California, is a good example. Soils on marine terraces cut into Miocene andesite on this island are clay-rich Vertisols or Alfisols with vertic properties. These soils are overlain by silt-rich mantles, 5–20 cm thick, that contrast sharply with the underlying clay-rich subsoils. The silt mantles have a mineralogy that is distinct from the island bedrock. Silt mantles are rich in quartz, which is rare in the island andesite. The clay fraction of the silt mantles is dominated by mica, also absent from local andesite, and contrasts with the subsoils, dominated by …