Digital Commons Network^™

Rates Of Convergence To Self-Similar Solutions Of Burgers' Equation, Joel Miller

HMC Senior Theses

Burgers’ Equation ut + cuux = νuxx is a nonlinear partial differential equation which arises in models of traffic and fluid flow. It is perhaps the simplest equation describing waves under the influence of diffusion. We consider the large time behavior of solutions with exponentially localized initial conditions, analyzing the rate of convergence to a known self similar single-hump solution. We use the Cole-Hopf Transformation to convert the problem into a heat equation problem with exponentially localized initial conditions. The solution to this problem converges to a Gaussian. We then find an optimal Gaussian approximation which is accurate to order …

Combinatorial Proofs Of Generalizations Of Sperner's Lemma, Elisha Peterson

HMC Senior Theses

In this thesis, we provide constructive proofs of serveral generalizations of Sperner's Lemma, a combinatorial result which is equivalent to the Brouwer Fixed Point Theorem. This lemma makes a statement about the number of a certain type of simplices in the triangulation of a simplex with a special labeling. We prove generalizations for polytopes with simplicial facets, for arbitrary 3-polytopes, and for polygons. We introduce a labeled graph which we call a nerve graph to prove these results. We also suggest a possible non-constructive proof for a polytopal generalization.

Finite Invariance Of Cayley Calibration Form, Yinan Song

HMC Senior Theses

In the further development of the string theory, one needs to understand 3 or 4-dimensional volume minimizing subvarieties in 7 or 8-dimensional manifolds. As one example, one would like to understand 4-dimensional volume minimizing cycles in a torus T8. The Cayley calibration form can be used to find all volume minimizing cycles in each homology class of T8. In order to apply the Cayley form to 8-dimensional tori, we need to understand the finite symmetry of the Cayley form, which has a continuous symmetry group Spin(7). We have found one finite symmetry group of order eight generated by three elements. …

A Conceptual Hydrogeological Model For The Lake Warden Recovery Catchments Esperance, Western Australia, R Short

Resource management technical reports

The National Land and Water Resource Audit (NLWRA), has identified Dryland Salinity as one of seven major themes for an audit of the nation’s land, water, vegetation and natural resource management. Within this theme, Project 3 has been developed to investigate a key catchment type and how management scenarios will impact on dryland salinity processes. The Lake Warden catchments have been chosen as one of four catchment water balance studies to be undertaken nationally. The catchment water balance analysis will be undertaken using numerical modelling by the CSIRO, Division of Land and Water.

Are The Cognitive Processes Underlying Practical Intelligence Redundant With Those Underlying Traditional Intelligence, Shari Rauscher

Masters Theses & Specialist Projects

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Anxiety And Efficacy: Are They Related To Students' Choice Of Major?, Camille Johnson

Masters Theses & Specialist Projects

Research suggests that anxiety characteristics play a role in determining the courses students choose in college. Other research suggests that efficacy may play a similar role as well. The purpose of the present study was to investigate the relationship between anxiety and efficacy and choice of major for English and mathematics majors. Ninety-nine undergraduate and graduate students from Western Kentucky University (49 males and 50 females) participated in the study. All participants were officially declared mathematics (or mathematics-related, i.e., computer science) or English majors. Instruments included a measure of mathematics anxiety, mathematics efficacy, writing efficacy, writing anxiety, facilitating anxiety, debilitating …

Thirty-Fourth Commencement 2000 (Undergraduate), Sacred Heart University

Commencement Programs

Program for the 2000 Undergraduate ceremony held May 21, 2000.

Mpi Collective Operations Over Ip Multicast, Amy Apon, H A. Chen, Y O. Carrasco

Publications

Many common implementations of Message Passing Inter- face (MPI) implement collective operations over point-to-point operations. This work examines IP multicast as a framework for collective operations. IP multicast is not reliable. If a receiver is not ready when a message is sent via IP multicast, the message is lost. Two techniques for ensuring that a message is not lost due to a slow receiving process are examined. The techniques are implemented and compared experimentally over both a shared and a switched Fast Ethernet. The average performance of collective operations is improved as a function of the number of participating processes …

Examples Of Volume-Preserving Great Circle Flows Of S3, Ryan Haskett

HMC Senior Theses

This summer Herman Gluck and Weiqing Gu proved the last step in a process that took conformal maps between two complex spaces and related them to Volume Preserving Great Circle Fibrations of S3. These fibrations, which are non-intersecting flows, break down under certain conditions. We obtained the fibrations by applying the process to different conformal maps then calculated the angles where they intersect. This paper centers around the developments in the method for converting the conformal maps and finding the critical angles. Finally, the examples are included in their various stages of completeness.

Optimal Expected Values For Cribbage Hands, Philip Martin

HMC Senior Theses

The game of Cribbage has a complex way of counting points in the hands that are dealt to each player. Each player has a choice of what cards to keep and what cards to throw into an extra hand, called the crib, that one of the players gets to count towards his score. Ideally, you could try to keep the most points possible in your hand and your crib, or, conversely, the most points in your hand with the fewest points in your opponent’s crib. To add to the fun, a final card is randomly chosen that all three hands …

Fuzzy (Granular) Levels Of Quality, With Applications To Data Mining And To Structural Integrity Of Aerospace Structures, Roberto A. Osegueda, Carlos Ferregut, Vladik Kreinovich, Seelam Seetharami, Harry Schulte

Departmental Technical Reports (CS)

Experts usually describe quality by using words from natural language such as "perfect", "good", etc. In this paper, we deduce natural numerical values corresponding to these words, and show that these values explain empirical dependencies uncovered in data mining and in the analysis of structural integrity of aerospace structures.

Oxygen-Induced Positive Spin Polarization From Fe In The Vacuum Barrier, Evgeny Y. Tsymbal, Ivan I. Oleinik, David G. Pettifor

Evgeny Tsymbal Publications

Bonding at the ferromagnet–insulator interface is an important factor which influences spin polarization of the tunneling current in ferromagnetic tunnel junctions. In this article we investigate the spin-polarized electronic structure of the (001) surface of body-centered-cubic iron covered by an oxygen overlayer, as this could reflect the mechanism of bonding and spin polarization in iron/oxide tunnel junctions. The Fe/O atomic structure is optimized using the plane-wave code CASTEP within the spin-polarized generalized-gradient approximation. The electronic structure and local densities of states are calculated using the linear muffin-tin orbital method. The results show hybridization of the iron 3d orbitals with …

Fisheries Research Report No. 120 - A 12-Month Survey Of Recreational Fishing In The Leschenault Estuary Of Western Australia During 1998, B E. Malseed, Neil R. Sumner, P C. Williamson

Fisheries Research Reports

A survey of recreational boat-based and shore-based fishing in the Leschenault Estuary was conducted between January 1998 and December 1998. The survey estimated the total annual boat-based recreational fishing effort as 33,392 fisher days, with 86% of this effort targeting blue swimmer crabs. The total annual shore-based recreational fishing effort was estimated to be 5,610 fisher days, with 88% of this effort targeting blue swimmer crabs.

The recreational blue swimmer crab catch from the Leschenault Estuary is substantial and exceeds the reported commercial catch. The estimated total recreational catch of blue swimmer crabs was 219,000 crabs or 45.7 tonnes. This …

Origin Of The Magnetic Moments In La0.65Pb0.35Mno3 Epitaxial Thin Films, C.N. Borca, R.H. Cheng, Q.L. Xu, Sy_Hwang Liou, Shane Stadler, Y.U. Idzerda, Peter A. Dowben

Peter Dowben Publications

Crystalline films of La_0.65Pb_0.35MnO₃ grown on (100) LaAlO ₃ substrates by rf sputtering have been investigated using magnetic circular dichroism and inverse photoemission spectroscopy. We find evidence for strong hybridization between unoccupied levels associated with Mn 3d and O 2p states. The oxygen atoms "pick-up" a small magnetic moment through hybridization with Mn. ©2000 American Institute of Physics

Parent Brine Of The Castile Evaporites (Upper Permian), Texas And New Mexico, Walter E. Dean, Douglas W. Kirkland, Rodger E. Denison

United States Geological Survey: Staff Publications

The Upper Permian (lower Ochoan) Castile Formation is a major evaporite sequence (~10,000 km³) of calcite, anhydrite, and halite in west Texas and southeastern New Mexico. Traditionally the Castile brine has been considered to have been derived from seawater. This tradition has recently been challenged by two versions of the closed-basin drawdown model. They call for deposition from a mixed brine, in part marine and in large part nonmarine. They propose drawdown of as much as 500 m to form a major sink for ground water issuing from the surrounding Capitan reef complex. A large fraction of the …

Structure And Magnetic Properties Of N-Containing Nd–Fe–B Alloys Prepared By Mechanical Alloying, W. Liu, Z.D. Zhang, J. Ping Liu, X.K. Sun, David J. Sellmyer

David Sellmyer Publications

The structure and magnetic properties of Nd₂Fe₁₄BN_δ -based alloys prepared by mechanical alloying have been investigated. For the Nd₁₄Fe₇₈B₈N_y series, a large amount of NdN, α-Fe, and a small Nd₂Fe₁₄B phase are observed in x-ray diffraction patterns. With increasing Nd content, the amount of the Nd₂Fe₁₄BN_δ phase increases and α-Fe decreases gradually. When x≥25 in the Nd_xFe_92-xB₈N_y systems, some amount of the N-containing, Nd-rich phase appears. Meanwhile, the content of the nitrogen …

Magnetic Properties Of Self-Assembled Co Nanowires Of Varying Length And Diameter, H. Zeng, M. Zheng, Ralph Skomski, David J. Sellmyer, Yi Liu, L. Menon, Supriyo Bandyopadhyay

David Sellmyer Publications

Ferromagnetic Co nanowires have been electrodeposited into self-assembled porous anodic alumina arrays. Due to their cylindrical shape, the nanowires exhibit perpendicular anisotropy. The coercivity, remanence ratio, and activation volumes of Co nanowires depend strongly on the length, diameter, and spacing of the nanowires. Both coercivity and thermal activation volume increase with increasing wire length, while for constant center-to-center spacing, coercivity decreases and thermal activation volume increases with increasing wire diameter. The behavior of the nanowires is explained qualitatively in terms of localized magnetization reversal.

Operational Evaluation Of A Knowledge-Based Sea Ice Classification System, Denise Gineris, Cheryl Bertoia, Mary Ruth Keller, Leen-Kiat Soh, Costas Tsatsoulis

School of Computing: Conference and Workshop Papers

ARKTOS (Advanced Reasoning Using Knowledge for Typing of Sea Ice) is a fully automated intelligent sea ice classification system. ARKTOS is in use at the U.S. National Ice Center (NIC) for daily operations related to the NIC’S task of mapping the ice covered oceans. ARKTOS incorporates image processing, input from ancillary data, and artificial intelligence (AI) to analyze and classify RADARSAT Synthetic Aperture Radar (SAR) imagery. The NIC and Naval Research Laboratory (NRL/ERIM) have been testing and evaluating ARKTOS through the freeze-up, winter, melt-out and summer seasons of the Beaufort Sea. In this paper we outline the development and evolution …

Using The Spi To Identify Drought, C. T. Agnew

Drought Network News (1994–2001)

This article was written in response to the recent analysis of drought in Turkey by Komuscu (1999). The study showed the relationship between drought duration, drought frequency, and drought time scale using the Standardized Precipitation Index (SPI).

Announcements: Spring 2000

Drought Network News (1994–2001)

Contents:

Droughts: A Global Assessment

Proceedings of the National Workshop on Dynamic Crop Simulation Modeling for Agrometeorological Advisory Services

Central and Eastern European Workshop on Drought Mitigation

11th Global Warming International Conference and Expo

GLOBE Data Set

Revisiting The Spi: Clarifying The Process, Michael J. Hayes

Drought Network News (1994–2001)

The number of applications using the Standardized Precipitation Index (SPI) around the world continues to increase (e.g., Agnew, pp. 6–12 of this newsletter, and Komuscu 1999). However, there are relatively few publications explaining the SPI, and occasional misconceptions about the index have occurred.

When the SPI was first developed by McKee et al. (1993, 1995), it was meant to address some of the limitations that exist within the Palmer Drought Index (PDI). These first publications were relatively simple introductions of the SPI to the scientific community, appearing in the Proceedings of the Eighth and Ninth Applied Climatology Conferences, respectively, sponsored …

Characteristics Of Drought In Kerala, India, K. K. Nathan

Drought Network News (1994–2001)

Kerala state in India, which is the first area of the country to experience the southwest monsoon, has a moist and wet climate. Kerala is in the extreme southwestern part of the Indian subcontinent; it borders Karnataka state in the north, Tamil Nadu in the east, and the Arabian Sea in the west (Figure 1). The entire state is one of the 35 meteorological subdivisions in India.

Kerala’s climate is tropical monsoon and tropical savanna, according to Koppen’s climatic classification (Figure 1). The state normally experiences excessive seasonal rainfall, with hot summers (except in the extreme southern districts like Trivandrum, …

Why Two Sigma? A Theoretical Justification, Hung T. Nguyen, Vladik Kreinovich, Gennady N. Solopchencko, Ching-Wang Tao

Departmental Technical Reports (CS)

For a normal distribution, the probability density is everywhere positive, so in principle, all real numbers are possible. In reality, the probability that a random variable is far away from the mean is so small that this possibility can be often safely ignored. Usually, a small real number k is picked (e.g., 2 or 3); then, with a probability P0(k)~1 (depending on k), the normally distributed random variable with mean a and standard deviation sigma belongs to the interval A=[a-k*sigma,a+k*sigma].

The actual error distribution may be non-Gaussian; hence, the probability P(k) that a random variable belongs to A differs from …

The Use Of Fuzzy Measures In Pain Relief Control, Vladik Kreinovich, Nadipuram R. Prasad

Departmental Technical Reports (CS)

Many people suffer from a continuous strong pain which is caused solely by the malfunction of the pain mechanism itself. One way to ease their pain is to electrically stimulate the spinal cord. Since the equations of pain are not known, we must use heuristic methods to find the optimal pain relief stimulation. In this paper, we show how fuzzy measures and similar nonlinear models can be used in pain relief control: they can be used to determine the parameters of the model which describes the dependence of the pain relief on the applied stimulation. Thus, fuzzy measures lead to …

Utah State University Commencement, 2000 – Main Campus, Utah State University

Commencement Programs

107th Annual Commencement of Utah State University

The Effects Of Block Scheduling On Students With Special Needs, Kimberly C. Seifring

Theses and Dissertations

This study surveyed the professionals from two schools in the southern New Jersey area regarding their views of block scheduling as well as their views on the effectiveness of block scheduling among students with special needs. A total of 243 surveys were distributed and 61 were returned. The survey questioned the teachers in regards to the changes they had to incorporate into their daily instructional time upon switching to block scheduling, the advantages and disadvantages of block scheduling, and how to ensure that students with special needs experience success while participating in a block schedule. A majority of the participants …

Instrumentation And Measurement Of Secondary Electron Emission For Spacecraft Charging, Neal Nickles, John R. Dennison

All Physics Faculty Publications

Secondary electron emission is an important physical mechanism in the problem of spacecraft charging. The NASA Space Environments and Effects branch is currently revising NASA’s strategy for mitigating damage due to spacecraft charging. In an effort to substantially improve the modeling of spacecraft charging, measurements of secondary electron emission parameters are being made. The design of the apparatus needed to measure these parameters is discussed in detail. Various measurement techniques are explained and conclusions are drawn about the suitability of the final design.

Helix Inversion In The Chiral Nematic And Isotropic Phases Of A Liquid Crystal, Benjamin P. Huff , '99, Jacob J. Krich , '00, Peter J. Collings

Physics & Astronomy Faculty Works

Measurements of the chirality (2π/pitch) in the chiral nematic phase and of a structural constant proportional to the chirality in the isotropic liquid for a system in which a helix inversion line crosses the chiral nematic to isotropic phase transition line are reported. While the chirality shows a strong temperature dependence in the chiral nematic phase, it loses all temperature dependence in the isotropic phase. In addition, the chirality in the isotropic phase is proportional to the chirality in the chiral nematic phase at the phase transition, and may in fact be continuous across the transition. While molecular field and …

Stomatal Responses In Intact Leaves: Stomatal Interactions Within An Areole, Freya W. Denne

Biology

The objective of this project was to study the interactions among adjacent stomata in response to environmental conditions. Fully expanded and intact leaves from cocklebur (Xanthium strumarium L.) plants grown in a controlled-environment greenhouse were clamped to a microscope stage for observation. Changes in stomatal apertures in response to changes in photon flux density (PFD) and evaporative demand (Δw, the water vapor mole fraction gradient between leaf and air) were measured. Increases in PFD elicited no significant coordinating responses among stomata. Responses of stomata to decreases in PFD were suggestive of coordination, but not conclusive. However, stomatal …

University Of Montana Events Tuesday, May 2, Through Monday, May 8, 2000, University Of Montana--Missoula. Office Of University Relations

University of Montana News Releases, 1928, 1956-present

No abstract provided.