Digital Commons Network^™

Principal Angles And Approximation For Quaternionic Projections [Dataset], Terry A. Loring

Math and Statistics Datasets

We extend Jordan's notion of principal angles to work for two subspaces of quaternionic space, and so have a method to analyze two orthogonal projections in the matrices over the real, complex or quaternionic field (or skew field). From this we derive an algorithm to turn almost commuting projections into commuting projections that minimizes the sum of the displacements of the two projections. We quickly prove what we need using the universal real C*-algebra generated by two projections.

Order Fitting Policies For Service Systems With Pricing And Inventory Decisions, Salvador Romo-Fragoso

Open Access Dissertations

The present work is the foundation for our line of research, looking for policy solutions for: order acceptance, capacity management with interruptions, pricing, and trade-offs between different assets. The first model represents an organization choosing order fitting and pricing policies for a service company selecting between deals and regular jobs with poisson arrivals. The prices for regular jobs are exogenous, whereas winning the deals depends on pricing bids. We derived and compared optimal pricing for two distinct order acceptance policies under a setting where the server had no queue. We investigated the impact of the system parameters on the optimal …

The Near-Inertial Response To Hurricane Ivan, Ryan M. Schuster

Open Access Theses

As part of a US Naval Research Laboratory Experiment (Teague et al., 2007), fourteen Acoustic Doppler Current Profilers (ADCPs) were deployed on the northern rim of the DeSoto Canyon in 2004, as well as four Aanderaa current meters placed at approximately 950 m depth. Preceding placement of this moored array, dozens of conductivity, temperature, and depth probes (CTDs) were ship-cast in the surrounding area. At 0000 UTC on September 16, 2004, hurricane Ivan passed directly over the mooring array, leaving all fourteen moorings intact. Unprecedented measurements of currents in three dimensions and bottom temperature and pressure were recorded during storm …

Integrating Input-Output And Life Cycle Assessment: Mathematical Foundations, Randall Jackson

Regional Research Institute Technical Documents

No abstract provided.

U.S. Drought Monitor, December 17, 2013, Mark D. Svoboda

United States Agricultural Commodities in Drought Archive

Drought map of U.S. for December 17, 2013 (12/17/13) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle, Winter wheat.

Radical Cataloging: From Words To Action, Heather Lember, Suzanne Lipkin, Richard Jung Lee

Urban Library Journal

Radical cataloging seeks to give a voice to people and concepts that are difficult to access through library subject searches. This article will explore four areas of radical cataloging: cataloging rules and the inequities and hierarchical problems inherent in classification itself, the use of cataloging to further a cause, the challenges of language in subject headings; and cataloging efforts around unconventional collections, such as zines.

Counting Threshold Graphs And Finding Inertia Sets, Christopher Abraham Guzman

Theses and Dissertations

This thesis is separated into two parts: threshold graphs and inertia sets. First we present an algorithmic approach to finding the minimum rank of threshold graphs and then progress to counting the number of threshold graphs with a specific minimum rank. Second, we find an algorithmic and more automated way of determining the inertia set of graphs with seven or fewer vertices using theorems and lemmata found in previous papers. Inertia sets are a relaxation of the inverse eigenvalue problem. Instead of determining all the possible eigenvalues that can be obtained by matrices with a specific zero/nonzero pattern we restrict …

Integrating Input-Output And Life Cycle Assessment: Mathematical Foundations, Randall Jackson

Regional Research Institute Resource Documents

Input-output (IO) and Life Cycle Assessment (LCA) modeling share a strikingly similar mathematical foundation and formulation, yet melding the two frameworks is not completely straightforward. In particular, the boundaries of the two systems must be brought into alignment carefully, so as to avoid double counting. In this document, the two frameworks and their mathematical foundations are presented in brief, and the salient issues that enter into procedures integrating the two are highlighted.

Decline Curve Analysis And Enhanced Shale Oil Recovery Based On Eagle Ford Shale Data, Dieudonne K. Delaihdem

Engineering

Transient and fracture dominated flow regimes in tight permeability shale reservoirs with hydraulically fractured horizontal wells impose many unconventional challenges. These include execution of appropriate shale decline curve analysis and the optimization of hydrocarbons recovery. Additionally, short production profiles available are inadequate for accurate production decline analysis. This research assessed the effectiveness of Arps' decline curve analysis and recently established methods--power law exponential analysis, logistic growth analysis, Duong's method and the author's approach--to predict future production of horizontal wells in the Eagle Ford Shale. Simulation models investigated history matching, enhanced shale oil recovery, and drainage area beyond stimulated reservoir volume. …

Response Of Pile-Guided Floats Subjected To Dynamic Loading, Zhili Quan, N/A 权致力

Engineering

Pile-guided floats can be a desirable alternative to stationary berthing structures. Both floats and guide piles are subjected to time varying (dynamic) forces such as wind-generated waves and impacts from vessels. There is little design information available concerning the dynamic load environment to which the floats will be subjected. So far, the most widely acceptable method used in offshore structure design is the Kinetic Energy Method (KEM). It is a simplified method that is based on the conservation of energy. This approach is straightforward and easy to implement. However, in spite of its simplicity and straightforwardness, the method lacks accuracy. …

Online Social Media As A Social-Ecological Systems Research Tool: Facebook And Two Rural Alaskan Communities, Richard E. Hum

Rural Development

The earth has transitioned into the anthropocene, which is defined by complex environmental change linked to human behavior and requires new tools of analysis in order to understand shifting social-ecological system (SES) dynamics. In this work, I explore taking advantage of widespread online social media participation to develop the tools for doing so. Spatially grounded public exchanges on Facebook are examined with three goals in mind: 1) examine the types of SES content being passed through this communication medium, 2) compare community observations to relevant scientific observations, and 3) define a flexible and reproducible research method for integrating these communications …

Academic, Behavioral And Social Intervention Strategies For Elementary Children With Autistic Spectrum Disorder, Kristin Flora

Counseling

Students with Autism Spectrum Disorder (ASD) experience academic, behavioral and social challenges that can interfere with their ability to participate fully in the school environment. School districts are legally mandated to provide services to students with disabilities. This paper provides definitions of ASD, addresses some of the diagnostic testing instruments, describes theoretical approaches, and looks at three evidence-based intervention strategies that could be utilized by a school counselor and staff members to work effectively with students with autism. The first is applied behavioral analysis (ABA) which centers on teaching small, measurable units of behavior systematically. The second intervention is assistive …

Glucose Transporter-4 In Mononuclear Cells Of Sled Dogs, Theresia Maria Schnurr

Chemistry and Biochemistry

The glucose transporter-4 (GLUT4) is the glucose transporter most responsive to insulin and has been thought to exist predominately in muscle and adipose cells. There have been findings that the glucose transporter-4 isoform is also expressed in subpopulations of white blood cells such as mononuclear cells. This study was designed to validate the presence of GLUT4 in subpopulations of white blood cells of sled dogs and to investigate whether changes in GLUT4 protein levels in white blood cells might be associated with age and stage of conditioning, as it has been reported in muscle. Our initial results have shown the …

Teaching A Novel Using The Common Core State Standards, Danielle Holley

Education

The purpose of this project was to explore ways that teachers can use the newly adopted Common Core State Standards to drive their instruction while teaching a novel. I created lessons for teachers to apply to the teaching of any novel and also gave specific lessons to use while teaching the novel The Adventures of Ulysses, by Bernard Evslin. I created lessons that addressed the Common Core's English Language Arts standards in reading literature, reading informational texts, writing, speaking and listening. My goal for this project was to explore how teachers could incorporate the use of informational texts, multimedia tools, …

Bride-Stealing: A Myth Of Misogyny, Seetha Murugesan

Indigenous Studies

Bride-stealing, an explicit symbolic misogynistic action in The Iliad and The Kamba Ramayanam, is analyzed as a long-term patterned conduct of human behavior among the peoples who produced these works. The systematic pattern of bride stealing found in the epics discussed suggests that within these groups social constructs had always been in favor of female inferiority and subjugation. This places an emphasis on gender as an issue, manifested in the treatment of women by men as "others." The narrations of marginalization of women in the epics lead to a critique of the hypothesis that they are misogynistic. Here a framework …

Using The Generalized Interpolation Material Point Method For Fluid-Solid Interactions Induced By Surface Tension, Liangbiao Chen, N/A 陈 良彪

Engineering

This thesis is devoted to the development of new, Generalized Interpolation Material Point Method (GIMP)-based algorithms for handling surface tension and contact (wetting) in fluid-solid interaction (FSI) problems at small scales. In these problems, surface tension becomes so dominant that its influence on both fluids and solids must be considered. Since analytical solutions for most engineering problems are usually unavailable, numerical methods are needed to describe and predict complicated time-dependent states in the solid and fluid involved due to surface tension effects. Traditional computational methods for handling fluid-solid interactions may not be effective due to their weakness in solving large-deformation …

An Algorithm For Motion Estimation From The Tomographic Data, Alexander Katsevich, Michael Silver, Alexander Zamyatin

UCF Patents

In this paper we study local tomography (LT) in the motion contaminated case. It is shown that microlocally, away from some critical directions, LT is equivalent to a pseudo-differential operator of order one. LT also produces non-local artifacts that are of the same strength as useful singularities. If motion is not accurately known, singularities inside the object f being scanned spread in different directions. A single edge can become a double edge. In such a case the image of f looks cluttered. Based on this observation we propose an algorithm for motion estimation. We propose an empiric measure of image …

Jakobshavn Isbr�_: Velocity Variations From Hourly To Decadal Time Scales At Greenland's Fastest Tidewater Glacier, David Bryan Podrasky

Geosciences

Outlet glaciers in Greenland, and elsewhere, have recently shown large variations in terminus position and ice flux. One example is the tidewater retreat of Jakobshavn Isbr�_, which began in the late 1990s with high thinning rates, acceleration and collapse of the floating glacier tongue. The retreat has continued to the present, with glacier speeds more than doubling in two decades' time. A campaign of in-situ measurements was initiated in 2006 with the aim of determining the importance of short-term forcing as a control on the continuing evolution of the glacier. Three years of continuous GPS measurements along the centerline of …

A Departmental Focus On High Impact Undergraduate Research Experiences, Robin Kinnel, Adam W. Van Wynsberghe, Ian J. Rosenstein, Karen S. Brewer, Myriam Cotten, George C. Shields, Charles J. Borton, Sueann Z. Senior, Gregory S. Rahn, Timothy E. Elgren

Faculty Journal Articles

Undergraduate research experiences have become an integral part of the Hamilton College chemistry experience. The major premise of the chemistry department’s curriculum is that research is a powerful teaching tool. Curricular offerings have been developed and implemented to better prepare students for the independence required for successful undergraduate research experiences offered during the academic year and the summer. Administrative support has played a critical role in our ability to initiate and sustain scholarly research programs for all faculty members in the department. The research-rich curriculum is built directly upon or derived from the scholarly research agendas of our faculty members. …

Developing Guidelines For Including Mobility-Based Performance Specifications In Highway Construction Contracts, Shawn J. Larson

Theses and Dissertations

Construction zones can greatly affect the traffic flow on roadways, especially when lane closures are required. Traditionally, the Utah Department of Transportation (UDOT) has used traffic management specifications that only allow lane closures and road work to be done during predetermined hours or specifications that require a certain number of lanes to be open at all times. Recently, mobility-based work-zone traffic flow maintenance has been considered. This method requires continuous monitoring of mobility-based performance data and a mechanism to send alerts to the contractors when the mobility data does not meet the standards set by the specifications. UDOT recently tested …

A Kinetic Study Of Aqueous Calcium Carbonate, Derek Daniel Harris

Theses and Dissertations

Amorphous calcium carbonate (ACC) precipitation is modeled using particle nucleation, growth, and aggregation. The particles are tracked in terms of their radial size and particle density using direct quadrature method of moments (DQMOM). Four separate nucleation models are implemented and are compared to experimental data. In discord with a recent study, it is shown that classical nucleation, coupled with equilibrium chemistry, is in good agreement with experimental data. Novel nucleation mechanisms are presented which fit the experimental data with slightly greater accuracy. Using equilibrium chemistry it is shown that the equilibrium value of ACC is pKeq = 7.74 at 24C, …

Overcoming Cubesat Downlink Limits With Vitamin: A New Variable Coded Modulation Protocol, Thomas Sielicki

Engineering

Many space missions, including low earth orbit CubeSats, communicate in a highly dynamic environment because of variations in geometry, weather, and interference. At the same time, most missions communicate using fixed channel codes, modulations, and symbol rates, resulting in a constant data rate that does not adapt to the dynamic conditions. When conditions are good, the fixed date rate can be far below the theoretical maximum, called the Shannon limit; when conditions are bad, the fixed data rate may not work at all. To move beyond these fixed communications and achieve higher total data volume from emerging high-tech instruments, this …

Analysis Of An Oscillating Plate Coupled With Fluid, Michael J. Nash

Engineering

The mechanical vibration of an oscillating cantilever plate is studied to determine the interaction of a plate coupled with air and with water. Experimental data was collected and analyzed using multiple methods including Fast Fourier Transform, wavelet analysis, and the Hilbert-Huang Transform (HHT) to characterize the behavior of the plate. The HHT is able to process nonlinear and nonstationary signals and provides more meaningful information compared to the traditionally used Fourier transform for similar applications. The HHT was found to be appropriate and more descriptive for the analysis of coupled fluid-structure systems. Digital Particle Image Velocimetry (DPIV) was also used …

Re-Storing The Earth: A Phenomenological Study Of Living Sustainably, Jessica B. Buckley

Faculty and Staff Scholarship

Living sustainably evokes ideas of lived, bodily engagement with and perception of the earth. Yet, modern ways of thinking and speaking have slowly alienated the earth from consciousness. Using phenomenological methods, the author examines the experience of living sustainably, exploring her own background and the idea of restoring the earth to consciousness, before examining the lives of two students dedicated to living sustainably. Components of upholding the earth, in-volving humanity, perceiving differences in studying and embodying sustainability, and engaging in choices fill the experience of living sustainably.

Investigating The Effects Of Land Use On Small Mammal Populations, Emily Vincent

Student Research

Introduction
The DePauw Nature Park is an excellent site to study the effects of land use on ecosystems. The recent construction of a small farm and the recent restoration of farmland into a prairie provide sites to study how changes in land use affect ecosystems. We studied the effects of land use changes on small mammal communities at the campus farm, an old field next to the campus farm, and a restored prairie.

Hypotheses
We hypothesized that the abundance and diversity of small mammals would be highest in the restored prairie and lowest in the campus farm.

Methods
We used …

Three Dimensional Volcano-Acoustic Source Localization At Karymsky Volcano, Kamchatka, Russia, Colin Rowell

Geosciences

We test two methods of 3-D acoustic source localization on volcanic explosions and small-scale jetting events at Karymsky Volcano, Kamchatka, Russia. Recent infrasound studies have provided evidence that volcanic jets produce low-frequency aerodynamic sound (jet noise) similar to that from man-made jet engines. Man-made jets are known to produce sound through turbulence along the jet axis, but discrimination of sources along the axis of a volcanic jet requires a network of sufficient topographic relief to attain resolution in the vertical dimension. At Karymsky Volcano, the topography of an eroded edifice adjacent to the active cone provided a platform for the …

Landfast Sea Ice Formation And Deformation Near Barrow, Alaska: Variability And Implications For Ice Stability, Joshua M. Jones

Geosciences

Climate change in the Arctic is having large and far-reaching effects. Sea ice is declining in annual extent and thinning with a warming of the atmosphere and the ocean. As a result, sea ice dynamic behaviour and processes are undergoing major changes, interacting with socio-economic changes underway in the Arctic. Near Barrow, Alaska, landfast sea ice is an integral part of native lñupiaq culture and impacts the natural resource extraction and maritime industries. Events known as breakouts of the landfast ice, in which stable landfast ice becomes mobile and detaches from the coast, have been occurring more frequently in recent …

Igneous Rocks And Structures Of The Nixon Fork Mine, Alaska, And Their Relations To Ores, Brian Perttu

Geosciences

The Nixon Fork Mine is a high-grade Cu-Au skarn deposit located near the western contact of the 5 square km Late Cretaceous Mystery pluton with marble, 7 km southeast of the Iditarod-Nixon Fork (I-NF) fault. This fault strikes at ~060�, and can be traced for ~400 km, with a minimum dextral displacement of ~90 km. Close proximity suggests that the Nixon Fork deposit should have been affected by the I-NF fault. In order to assess the structural evolution, I analyzed the orientations of geologic structures. I transcribed 1172 structures from previous mapping (to assess structures) and converted 186 maps into …

Basal Shear Strength Inversions For Ice Sheets With An Application To Jakobshavn Isbræ, Greenland, Marijke Habermann

Geosciences

Satellite and in situ observations of ice sheet outlet glaciers around the turn of the 21st century showed that rapid changes in ice dynamics are possible and important for the evolution of ice sheets. When attempting to model these dynamic changes the conditions at the ice-bed interface are crucial. Inverse methods can be used to infer basal properties, such as the basal yield stress, from abundant surface velocity observations by using a physical model of ice flow. Inverse methods are very powerful, but they need to be applied with care, otherwise errors can dominate the solution. In this study we …

Seismicity, Seawater And Seasonality: New Insights Into Iceberg Calving From Yahtse Glacier, Alaska, Timothy Chester Bartholomaus

Geosciences

At many of the largest glaciers and ice sheets on Earth, more than half of the annual ice loss occurs through iceberg calving into the ocean. Calving is also responsible for the most rapid ice mass changes, both directly (through the mechanical loss of ice at the terminus) and indirectly (through dynamic thinning of upstream ice initiated by terminus retreat). Yet, the mechanisms and factors that control calving are poorly understood. Recordings of glaciogenic seismic waves, known as "icequakes," produced during iceberg calving offer opportunities for insight that cannot be gleaned through other methods. In order to better understand iceberg …