Physical Sciences and Mathematics Commons^™

Tutte Polynomial In Knot Theory, David Alan Petersen

Theses Digitization Project

This thesis reviews the history of knot theory with an emphasis on the diagrammatic approach to studying knots. Also covered are the basic concepts and notions of graph theory and how these two fields are related with an example of a knot diagram and how to associate it to a graph.

Web-Based Library For Student Projects/Theses And Faculty Research Papers, Rudy Senjaya

Theses Digitization Project

The purpose of this project is to make available a Web-based Library, a web application developed for the Department of Computer Science at CSUSB to manage student projects/theses and faculty papers. The project is designed in accordance with Model-View-Controller (MVC) design pattern using the Jakarta Struts framework and iBATIS Data Mapper framework from Apache Software Foundation, JavaServer Pages (JSP), and MySQL database.

The Cohesive Element Approach To Dynamic Fragmentation: The Question Of Energy Convergence, J F. Monlinari, G Gazonas, R Raghupathy, A Rusinek, F Zhou

United States Army: Publications

The cohesive element approach is getting increasingly popular for simulations in which a large amount of cracking occurs. Naturally, a robust representation of fragmentation mechanics is contingent to an accurate description of dissipative mechanisms in form of cracking and branching. A number of cohesive law models have been proposed over the years and these can be divided into two categories: cohesive laws that are initially rigid and cohesive laws that have an initial elastic slope. This paper focuses on the initially rigid cohesive law, which is shown to successfully capture crack branching mechanisms in simulations. The paper addresses the issue …

The Wright Message, 2007, University Of Northern Iowa. Department Of Mathematics.

The Wright Message

Inside this issue:

-- Dear Department Alumni and Friends
-- 2007 - 2008 Tenure or Tenure-Track Faculty
-- New Faces in the Mathematics Department
-- Faculty Notes
-- Alumni Survey Conducted
-- Actuarial Program Thrives
-- Board of Regents Collaborative Mathematics and Science Initiative
-- TEAM News
-- DoDEA/UNI Project
-- Online Course Development
-- Math Day at UNI
-- First Millar Scholarship Awarded
-- In Memory of Paul Trafton
-- Major Gifts to the Department

Cns Connections, Winter 2007-08, University Of Northern Iowa. College Of Natural Sciences.

CNS Connections

Inside this issue:

-- Message from the Dean
-- CNS News in Short
-- Transitions
-- CNS students in the news
-- Biology professor boasts world-class collection of fiddler crabs
-- CNS projects to promote economic development under way
-- Physics building rededicated as Begeman Hall, CENN opens
-- Update from the Centers
-- Biotech goes on the road
-- Faculty research
-- UNI provides tools for successful career
-- Sustaining the UNI experience
-- Colemans endow Wilson Lectureship
-- Alumni News
-- CNS Advisory Board

Temperature-Driven Transition From The Wigner Crystal To The Bond-Charge-Density Wave In The Quasi-One-Dimensional Quarter-Filled Band, R. T. Clay, Rahul Hardikar, S. Mazumdar

Scholarship and Professional Work - LAS

It is known that within the interacting electron model Hamiltonian for the one-dimensional 1/4-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 …

Phase Diagram Of The One-Dimensional Hubbard-Holstein Model At Half And Quarter Filling, Rahul Hardikar, R. T. Clay

Scholarship and Professional Work - LAS

The Hubbard-Holstein model is one of the simplest to incorporate both electron-electron and electron-phonon interactions. In one dimension at half filling, the Holstein electron-phonon coupling promotes on-site pairs of electrons and a Peierls charge-density wave, while the Hubbard on-site Coulomb repulsion U promotes antiferromagnetic correlations and a Mott insulating state. Recent numerical studies have found a possible third intermediate phase between Peierls and Mott states. From direct calculations of charge and spin susceptibilities, we show that (i) as the electron-phonon coupling is increased, first a spin gap opens, followed by the Peierls transition. Between these two transitions, the metallic intermediate …

On The Size Of Succinct Indices, Alexander Golynski, Ankur Gupta

Scholarship and Professional Work - LAS

A succinct data structure occupies an amount of space that is close to the information-theoretic minimum plus an additional term. The latter is not necessarily a lower-order term and, in several cases, completely dominates the space occupancy both in theory and in practice. In this paper, we present several solutions to partially overcome this problem, introducing new techniques of independent interest that allow us to improve over previously known upper and lower bounds.

Comparative Investigation Of Dosimetric Tools In Imrt, Aaron Nicholas Garcia

Browse all Theses and Dissertations

Verification of the isodose distribution delivered to the planned tumor volume is required for quality assurance in the clinic. Verification in this context means ensuring that the actual dose delivered to a volume matches the dose that a computerized planning system intended that volume to receive. The computerized planning is performed by a Computerized Medical Systems (CMS) Intensity Modulated Radiation Therapy (IMRT) plan. Two methods of measuring the delivered dose are film dosimetry and diode dosimetry. This project will compare the relative isodose distribution profiles of film dosimetry and MapCheck (Sun Nuclear Corporation, a diode-based dosimetry system) to the relative …

Simple Descriptors For Modeling The Solubility Of Gases, Alcohols, And Halogenated Hydrocarbons In Water, Sule Sidigu

Browse all Theses and Dissertations

The Statmost, QSARIS, Excel, and SAS programs were used to model the solubility of gases, alcohols, and halogenated hydrocarbons in water using simple physical and topological descriptors. The alcohols were well-modeled using measures of the number of carbons, terminal methyls, and steric hindrance about the hydroxyl group. Molecular mass, boiling point, and critical volume or critical pressure were the best descriptors for the halogenated hydrocarbons. Critical pressure was the most applicable single descriptor for the gases. Molecular mass and boiling point also yielded good results for the gases and halogenated hydrocarbons when regressed together.

Gpu-Assisted Rendering Of Large Tree-Shaped Data Sets, Pallavi Ramachandra Mangalvedkar

Browse all Theses and Dissertations

Due to their complexity, medical data sets can easily comprise of several gigabytes in size. For example, geometric representations of a coronary arterial tree spanning vessels from the large proximal coronary arteries down to the capillary level consist of 6 gigabytes or more of geometry data, depending on the accuracy of the geometric representation. Visualization of such large data sets using the CPU alone can be inefficient and time consuming since they require special out-of-core techniques due to the size of the data set. The usage of the GPU can help render such data sets faster compared to CPU-based implementations …

Formation Of A Sydno[3,4- A]Indolone And Reactions Thereof, Ryan Christopher Vikan

Browse all Theses and Dissertations

In the present work, a synthetic route to the formation of a sydno[3,4- a]indolone was explored in the hope of attaining the first example of a fused-ring sydnone with an sp2-hybridized bridge. Formation of this product and exploration of its chemical behavior was anticipated to be of particular interest to the formation of NO-releasing prodrugs. A direct synthetic pathway to yield the target sydnoindolone starting from 3-(2-methoxycarbonylphenyl)sydnone and reaction with a base was proposed and explored. Attempted formation and isolation of the target sydnoindolone proved impossible under a variety of different conditions, undoubtedly due to the instability of this …

Biogeochemical Processes And Seasonal Effects In Flow-Through Mesocosm Reactors Simulating Constructed Wetlands, Sarah J. Tritschler

Browse all Theses and Dissertations

Due to their distinctive environments, constructed wetlands are utilized to remediate groundwater that has been contaminated with chlorinated ethenes (i.e. perchloroethene) and other such contaminants. This research focuses on vertical flow mesocosm reactors housed in a greenhouse at Wright State University, which simulate a constructed wetland on Wright-Patterson Air Force Base. These reactors were studied to investigate the effects of vegetation and seasonal changes on the redox parameters present. Water samples were collected from six different reactors from late September/early October 2006 until August 2007. The reactors were sampled three days in a row and this sampling was done once …

A Hybrid Approach To Retrieving Web Documents And Semantic Web Data, Trivikram Immaneni

Browse all Theses and Dissertations

The Semantic Web has been evolving into a property-linked web of RDF data, conceptually divorced from (but physically housed in) the World Wide Web of hyperlinked documents. Data Retrieval techniques are typically used to retrieve data from the Semantic Web while Information Retrieval techniques are used to retrieve documents from the Hypertext Web. Conceptually unifying the two webs enables the exploitation of their interconnections resulting in benefits to both data and document retrieval. Towards this end, we present the Unified Web model that integrates the two webs and formalizes the structure and the semantics of their interconnections. We present a …

An Experiment Using A Simple Photoassisted Fuel Cell Designed To Remediate Simulated Wastewater, John Cassidy, Faisa Touati, Kevin Mcguigan

Articles

Work in photochemistry work peaked in the 1980’s where there was the prospect of using sunlight shining on suspensions of titanium dioxide in order to catalytically cleave water into hydrogen and oxygen [1-5]. In this way a clean and efficient method of producing hydrogen as a fuel was envisaged. However, there was a requirement to use a rather high energy light to achieve the splitting and it was not as efficient with visible light[5]. Doped TiO2 layers have been used in a three electrode system for formic acid degradation[6]. In this work, the system uses an electrode coated with TiO2 …

Temperature Anomalies In The Lower Suwannee River And Tidal Creeks, Florida, 2005, Ellen A. Raabe, Elzbieta Bialkowska-Jelinska

School of Geosciences Student Publications

Temperature anomalies in coastal waters were detected with Thermal Infrared imagery of the Lower Suwannee River (LSR) and nearshore tidal marshes on Florida’s Gulf Coast. Imagery included 1.5-m-resolution day and night Thermal Infrared (TIR) and 0.75-m-resolution Color Infrared (CIR) imagery acquired on 2-3 March 2005. Coincident temperature readings were collected on the ground and used to calibrate the imagery. The Floridan aquifer is at or near the land surface in this area and bears a constant temperature signature of ~ 22 degrees Celsius. This consistent temperature contrasts sharply with ambient temperatures during winter and summer months. Temperature anomalies identified in …

Head-Elementary-Set-Free Logic Programs, Martin Gebser, Joohyung Lee, Yuliya Lierler

Computer Science Faculty Proceedings & Presentations

The recently proposed notion of an elementary set yielded a refinement of the theorem on loop formulas, telling us that the stable models of a disjunctive logic program can be characterized by the loop formulas of its elementary sets. Based on the notion of an elementary set, we propose the notion of head-elementary-set-free (HEF) programs, a more general class of disjunctive programs than head-cycle-free (HCF) programs proposed by Ben-Eiiyahu and Dechter. that can still be turned into nondisjunct:ive programs in polynomial time and space by "shifting" the head atoms into the body. We show several properties of HEF programs that …

ข่าว & สถานการณ์สิ่งแวดล้อมปี 2549

Thai Environment

No abstract provided.

สัมภาษณ์พิเศษ : ดร. อานนท์ สนิทวงศ์ ณ อยุธยา "ภาวะโลกร้อน" มหันตภัยใกล้ตัว, สิริพร แก่นสียา

Thai Environment

No abstract provided.

Hutgyi-สาละวิน, ผ่องศรี จั่นท้าว

Thai Environment

No abstract provided.

ระบบกรองและบำบัดน้ำเสียแบบเบ็ดเสร็จ แนวทางใหม่ของการจัดการคุณภาพน้ำในระบบการเลี้ยงพืชและสัตว์น้ำ แบบบูรณาการ ของสถาบันวิจัยทรัพยากรทางน้ำ, สมบัติ อินทร์คง, พอจำ อรัณยกานนท์, ชลธยา ทรงรูป, สุรพล ชุณหบัณฑิต, สมภพ รุ่งสุภา, อิทธิพร ตัณฑุวณิชย์, จิราวัฒน์ จิตรีเชาว์, เผดิมศักดิ์ จารยะพันธุ์

Thai Environment

No abstract provided.

มุมหนึ่งของเทคโนโลยีชีวภาพ...เพื่อสิ่งแวดล้อม, เบญจภรณ์ ประภักดี

Thai Environment

No abstract provided.

การจัดการขยะ : พื้นที่นำร่องเทศบาลเมืองทุ่งสง จังหวัดนครศรีธรรมราช, หนึ่งฤทัย คุ้มเสาร์

Thai Environment

No abstract provided.

แนวทางและดัชนี จัดโครงการรณรงค์เพื่ออนุรักษ์พลังงานในสถานศึกษา, เสถียร รุจิรวนิช

Thai Environment

No abstract provided.

แนะนำโครงการสถาบันวิจัยสภาวะแวดล้อม: โครงการศึกษาและกำหนด มีคุณภาพสิ่งแวดล้อมของพื้นที่พิเศษ เพื่อการท่องเที่ยวอย่างยั่งยืน หมู่เกาะช้าง พื้นที่เชื่อมโยง ระยะที่ 2, ทวีวงศ์ ศรีบุรี

Thai Environment

No abstract provided.

สิ่งแวดล้อมน่ารู้คู่โลกสวย

Thai Environment

No abstract provided.

Form Factors And Wave Functions Of Vector Mesons In Holographic Qcd, Hovhannes R. Grigoryan, Anatoly V. Radyushkin

Physics Faculty Publications

Within the framework of a holographic dual model of QCD, we develop a formalism for calculating form factors of vector mesons. We show that the holographic bound states can be described not only in terms of eigenfunctions of the equation of motion, but also in terms of conjugate wave functions that are close analogues of quantum-mechanical bound state wave functions. We derive a generalized VMD representation for form factors, and find a very specific VMD pattern, in which form factors are essentially given by contributions due to the first two bound states in the Q² -channel. We calculate electric …

Cascade Production In The Reactions 𝛾p → K⁺ K⁺(X) And 𝛾p → K⁺K⁺ Π⁻⁻(X), M. J. Amaryan, H. Bagdasaryan, S. Bültmann, S. L. Careccia, K. V. Dharmawardane, G. E. Dodge, G. Gavalian, N. Guler, C. E. Hyde-Wright, N. Kalantarians, A. Klein, S. E. Kuhn, M. R. Niroula, S. Tkachenko, L. B. Weinstein, J. Zhang, Et Al., Clas Collaboration

Physics Faculty Publications

Photoproduction of the cascade resonances has been investigated in the reactions γp → K + K +(X) and γp → K + K + π −(X). The mass splitting of the ground state (Ξ⁻,Ξ⁰) doublet is measured to be 5.4 ± 1.8 MeV/c², consistent with existing measurements. The differential (total) cross sections for the Ξ⁻ have been determined for photon beam energies from 2.75 to 3.85 (4.75) GeV and are consistent with a production mechanism of Y∗→K+Ξ⁻ through a t-channel process. The reaction γp→K+K+π−[Ξ⁰] has also been investigated to …

Cross Sections For The 𝛾p -> K*⁰ Σ⁺ Reaction At E𝛾 = 1.7-3.0 Gev, M. Amarian, H. Bagdasaryan, S. Bültmann, S. L. Careccia, G. E. Dodge, G. Gavalian, N. Guler, C. E. Hyde-Wright, A. Klein, A. V. Klimenko, S. E. Kuhn, M. R. Niroula, S. Tkachenko, L. B. Weinstein, J. Zhang, Et Al., The Clas Collaboration

Physics Faculty Publications

Differential cross sections for the reaction 𝛾p→ K*⁰Σ+ are presented in the photon energy range of 1.7 to 3.0 GeV. The K^*0 was detected by its decay products, K⁺π⁻, in the Continuous Electron Beam Accelerator Facility's large acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility. These data are the first K^*0 photoproduction cross sections ever published over a broad range of angles. Comparison with a theoretical model based on the vector and tensor K^∗-quark couplings shows good agreement with the data, except at forward angles, suggesting that …

Erratum: Cross Sections For The 𝛾p -> K*⁰ Σ⁺ Reaction At E𝛾 = 1.7-3.0 Gev (Physical Review C. 75, 042201), M. Amarian, H. Bagdasaryan, S. Bültmann, G. E. Dodge, G. Gavalian, C. E. Hyde-Wright, A. Klein, S. E. Kuhn, F. Sabatié, L. B. Weinstein, Et. Al., The Clas Collaboration

Physics Faculty Publications

No abstract provided.