Digital Commons Network^™

Theoretical Investigation Of Superconducting State Parameters Of Binary Metallic Glasses Cu_{1-C}Sn_C, Aditya M. Vora

Turkish Journal of Physics

Superconducting state parameters (SSP) viz. electron-phonon coupling strength \lambda, Coulomb pseudopotential \mu^*, transition temperature T_C, isotope effect exponent \alpha and effective interaction strength N_O V of seven Cu_{1-c} Sn_c binary metallic glasses have been reported using Ashcroft's empty core (EMC) model potential for the first time. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used in the present investigation to study the screening influence on the aforesaid properties. The T_C obtained from H-local field correction function are found in qualitative agreement with available experimental data …

Theoretical Analysis Of Acoustic Attenuation And Nonlinearity In Barium Monochalcogenides In B2 Phase, Rajendra Kumar Singh, Rishi Pal Singh, Manish Pratap Singh, Sujeet Kumar Chaurasia

Turkish Journal of Physics

Temperature dependence of ultrasonic attenuation due to phonon-phonon interaction and thermo-elastic loss have been studied in (CsCl-type) barium monochalcogenides (BaX, X= S, Se, Te), in the temperature range 50-500 K; for longitudinal and shear modes of propagation along , and directions. Second and third order elastic constants have been evaluated using electrostatic and Born repulsive potentials and taking interactions up to next nearest neighbours. Gruneisen parameters, nonlinearity constants, nonlinearity constants ratios and viscous drag due to screw and edge dislocations have also been evaluated for longitudinal and shear waves at 300 K. In the present investigation, it has been found …

Sql Injection Analysis, Detection And Prevention, Jagdish Halde

Master's Projects

Web sites are dynamic, static, and most of the time a combination of both. Web sites need protection in their database to assure security. An SQL injection attacks interactive web applications that provide database services. These applications take user inputs and use them to create an SQL query at run time. In an SQL injection attack, an attacker might insert a malicious SQL query as input to perform an unauthorized database operation. Using SQL injection attacks, an attacker can retrieve or modify confidential and sensitive information from the database. It may jeopardize the confidentiality and security of Web sites which …

Design & Evaluation Of Path-Based Reputation System For Manet Routing, Ji Li

Master's Projects

Most of the existing reputation systems in mobile ad hoc networks (MANET) consider only node reputations when selecting routes. Reputation and trust are therefore generally ensured within a one-hop distance when routing decisions are made, which often fail to provide the most reliable, trusted route. In this report, we first summarize the background studies on the security of MANET. Then, we propose a system that is based on path reputation, which is computed from reputation and trust values of each and every node in the route. The use of path reputation greatly enhances the reliability of resulting routes. The detailed …

Determination Of The Extravascular Burden Of Carbon Monoxide (Co) On Human Heart, Kinnera Erupaka

University of Kentucky Master's Theses

Noninvasive measurements of myocardial carboxymyoglobin levels (%MbCO) and oxygen tensions (PtO2) are difficult to obtain experimentally. We have developed a compartmental model which allows prediction of myocardial %MbCO levels and PtO2 for varied carbon monoxide (CO) exposures. The cardiac compartment in the model consists of vascular subcompartments which contain two tissue subcompartments varying in capillary density. Mass-balance equations for oxygen (O2) and CO are applied for all compartments. Myocardial oxygen consumption and blood flow are quantified from predictive formulas based on heart rate. Model predictions are validated with experimental data at normoxia, hypoxia, exercise and hyperoxia. CO exposures of varying …

Topology-Based Modeling And Analysis Of Orthogonal Cutting Process, Rajesh Kandibanda

University of Kentucky Master's Theses

This thesis presents the application of topology to machining at the micro and macro levels through an experimental study, modeling and analysis. Uncoated carbide tools of four different cutting edge radii and four different feed rates are used to perform orthogonal machining on AISI 1045 steel disks. The study analyzes the cutting forces, changing grain boundary parameters, micro-hardness, temperature and correlates them to the residual stresses that hold a key to the product life. This analysis helps to understand and evaluate the aspects of grain boundary engineering that influence the fatigue life of a component. The two components of residual …

Hdl Implementation And Analysis Of A Residual Register For A Floating-Point Arithmetic Unit, Akil Kaveti

University of Kentucky Master's Theses

Processors used in lower-end scientific applications like graphic cards and video game consoles have IEEE single precision floating-point hardware [23]. Double precision offers higher precision at higher implementation cost and lower performance. The need for high precision computations in these applications is not enough to justify the use double precision hardware and the extra hardware complexity needed [23]. Native-pair arithmetic offers an interesting and feasible solution to this problem. This technique invented by T. J. Dekker uses single-length floating-point numbers to represent higher precision floating-point numbers [3]. Native-pair arithmetic has been proposed by Dr. William R. Dieter and Dr. Henry …

Assessing The Demand For Weather Index Insurance In Shandong Province, China, Lisha Zhang

University of Kentucky Master's Theses

Shandong Province, renowned as China’s greatest agricultural province, is dominated by smallholders growing rain-fed crops and vulnerable to severe weather shocks that can increase poverty rates. Weather index insurance, an innovative agricultural risk management product, may be an effective mechanism to address vulnerability to catastrophic weather risk in rural regions of China, including Shandong. This project evaluated current household livelihood and risk management strategies and farmer interest in weather index insurance. Data from 174 participants were collected using a methodology that included focus groups, questionnaires, and personal interviews. Despite limited access to formal financial services, Shandong farmers generally employ informal, …

Content Preparation Of Pre-Service Agricultural Education Teachers And Its Influence On Their Content Knowledge, Amber Houck

University of Kentucky Master's Theses

Content knowledge preparation for teachers is a crucial component of the modal curriculum model for education. The purpose of this study was to determine if the amount and quality of coursework preparation of pre-service University of Kentucky agriculture teachers influences their content knowledge as defined by the Praxis II agriculture exam scores. This study concluded that there was variability in coursework preparation of pre-service agriculture teachers at the University of Kentucky. Praxis II exam scores of pre-service teachers indicated that most students are meeting an adequate content knowledge level based on the exam material. It can also be concluded that …

Role Of Dipoles In The Bulk Phosphor Layer In The Electroluminance Mechanisms Of A.C. Thin Film Electroluminescent Display Devices, Praveen Kumar Sivakumar

University of Kentucky Doctoral Dissertations

The purpose of this dissertation is to advance the understanding of SrS-based a. c. thin film electroluminescent (ACTFEL) devices. The role of traps in the bulk phosphor layer in the light emission mechanism from ACTFEL devices is studied, characterized and modeled.

Experiments were performed to observe the response of the ACTFEL devices to tailored voltage excitations. A physical model was developed to describe the optoelectronic processes taking place in the phosphor; analytical equations were written and numerically simulated to plot the flux and luminance responses of the device to similarly tailored voltage excitations.

The voltage excitation parameters such as amplitude, …

A Comparative Xeon And Cbe Performance Analysis, Randy Fort

Master's Projects

The Cell Broadband Engine is a high performance multicore processor with superb performance on certain types of problems. However, it does not perform as well running other algorithms, particularly those with heavy branching. The Intel Xeon processor is a high performance superscalar processor. It utilizes a high clock speed and deep pipelines to help it achieve superior performance. But deep pipelines can perform poorly with frequent memory accesses. This paper is a study and attempt at quantifying the types of programmatic structures that are more suitable to a particular architecture. It focuses on the issues of pipelines, memory access and …

The Prosody Of Uncertainty For Spoken Dialogue Intelligent Tutoring Systems, Bevan Jones

Master's Projects

The speech medium is more than an audio conveyance of word strings. It contains meta information about the content of the speech. The prosody of speech, pauses and intonation, adds an extra dimension of diagnostic information about the quality of a speaker's answers, suggesting an important avenue of research for spoken dialogue tutoring systems. Tutoring systems that are sensitive to such cues may employ different tutoring strategies based on detected student uncertainty, and they may be able to perform more precise assessment of the area of student difficulty. However, properly identifying the cues can be challenging, typically requiring thousands of …

Exact And Approximation Algorithms For Computing Reversal Distances In Genome Rearrangement, Euna Park

Master's Projects

Genome rearrangement is a research area capturing wide attention in molecular biology. The reversal distance problem is one of the most widely studied models of genome rearrangements in inferring the evolutionary relationship between two genomes at chromosome level. The problem of estimating reversal distance between two genomes is modeled as sorting by reversals. While the problem of sorting signed permutations can have polynomial time solutions, the problem of sorting unsigned permutations has been proven to be NP-hard [4]. This work introduces an exact greedy algorithm for sorting by reversals focusing on unsigned permutations. An improved method of producing cycle decompositions …

Bibliography Data Mining And Data Visualization, Deepthi Pullannagari

Master's Projects

Data mining is a concept of discovering meaningful patterns from large data repositories, and Data visualization is a graphical representation of data using shapes, colors and images for a better conceptualization. These two techniques have been in use for a long time now and are used together in number of fields to gain a better perception of the data. Bibliographic data is widely used in academic and scientific literature fields and this project deals with data mining and data visualization of bibliographic data downloaded from Citeseer Citation Indexing system. The downloaded metadata is extracted into the database, looking for patterns …

Online Collaborative Time Management System Using Artificial Intelligence, Anand Sivaramakrishnan

Master's Projects

Online Collaborative Time Management System is a system that will plan events and help achieve goals intelligently using Partial Order Planning. This product is similar to a social networking site, which plans events for collaborative set of people. For this masters’ project, such a system is developed. Our site allows multiple people to add items to a collaborative To-Do list. The user interface for our site allows people to add actions and preconditions to the existing system, enabling the system to grow constantly. In order to generate a sequence of actions to the most complex problems, partial order generators are …

Online Visualization Of Bibliography Using Visualization Techniques, Bharath Kumar Manur Venkataramana

Master's Projects

Visualization is a concept where we can represent some raw data in the form of graphs, images, charts, etc. which will be very helpful for the end-user to correlate and be able to understand the relationships between the data elements in a single screen. Representing the bibliographic information of the computer science journals and proceedings using Visualization technique would help user choose a particular author and navigate through the hierarchy and find out what papers the author has published, the keywords of the papers, what papers cite them, the co-authors along with the main author, and how many papers are …

Thevenin Equivalent Circuit Estimation And Application For Power System Monitoring And Protection, Mohammad M. Iftakhar

University of Kentucky Master's Theses

The Estimation of Thevenin Equivalent Parameters is useful for System Monitoring and Protection. We studied a method for estimating the Thevenin equivalent circuits. We then studied two applications including voltage stability and fault location. A study of the concepts of Voltage Stability is done in the initial part of this thesis. A Six Bus Power System Model was simulated using MATLAB SIMULINK®. Subsequently, the Thevenin Parameters were calculated. The results were then used for two purposes, to calculate the Maximum Power that can be delivered and for Fault Location.

Contents

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Journal Of Mathematics And Science: Collaborative Explorations

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Arecibo Hi Absorption Measurements Of Pulsars And The Electron Density At Intermediate Longitudes In The First Galactic Quadrant, J. M. Weisberg, S. Stanimirovic, K. Xilouris, A. Hedden,, A. De La Fuente, S. B. Anderson, F. A. Jenet

Physics and Astronomy Faculty Work

We have used the Arecibo telescope to measure the H i absorption spectra of eight pulsars. We show how kinematic distance measurements depend on the values of the Galactic constants R0 and 0, and we select our preferred current values from the literature. We then derive kinematic distances for the low-latitude pulsars in our sample and electron densities along their lines of sight. We combine these measurements with all others in the inner Galactic plane visible from Arecibo to study the electron density in this region.

Nonmonotonicity In The Quantum-Classical Transition: Chaos Induced By Quantum Effects, Arie Kapulkin, Arjendu K. Pattanayak

Physics and Astronomy Faculty Work

The classical-quantum transition for chaotic systems is understood to be accompanied by the suppression of chaotic effects as the relative h is increased. We show evidence to the contrary in the behavior of the quantum trajectory dynamics of a dissipative quantum chaotic system, the double-well Duffing oscillator. The classical limit in the case considered has regular behavior, but as the effective h is increased we see chaotic behavior. This chaos then disappears deeper into the quantum regime, which means that the quantum-classical transition in this case is nonmonotonic in h.

Controlling The Ratchet Effect For Cold Atoms, Anatole Kenfack, Jiangbin Gong, Arjendu K. Pattanayak

Physics and Astronomy Faculty Work

Low-order quantum resonances manifested by directed currents have been realized with cold atoms. Here we show that by increasing the strength of an experimentally achievable delta-kicking ratchet potential, quantum resonances of a very high order may naturally emerge and can induce larger ratchet currents than low-order resonances, with the underlying classical limit being fully chaotic. The results offer a means of controlling quantum transport of cold atoms.

Conversion Of One-Way Street Pairs To Two-Way Operations In Downtown Birmingham, Jugnu Chemmannur

All ETDs from UAB

In recent years, higher-than-ever gas prices and soaring living expenses are driv-ing people back to city centers in search of reduced travel costs and greater proximity to services. This calls for an immediate need to revive downtown areas to make them attrac-tive and increase their efficiency at accommodating a variety of transportation modes, motorized and non-motorized. To help support this revival, researchers are conducting studies countrywide to understand the effects and relevance of conversion of one-way streets to two-way opera-tions. This paper reports the findings of a study that investigated the feasibility and poten-tial impacts of street conversion options on …

Lady Griz Volleyball Media Guide, 2008, University Of Montana—Missoula. Athletics Department

Lady Griz Volleyball Media Guides, 1979-2008

Media guide created about the Lady Griz volleyball team.

A Five Year Comparison Between An Extended Year School And A Conventional Year School: Effects On Academic Achievement, Vanessa Khankeo Vandergraaf

Dissertations

The purpose of this study was to compare the academic achievement of third grade students in an extended year school to that of third grade students in a conventional school. The problem statement was that both schools were academically deficient according to the requirements of the No Child Left Behind (NCLB) Act. The comparison between the two schools used communication arts and science data from 2002-2006 Missouri Assessment Program (MAP). It also examined the effects of variables such as summer breaks, socioeconomic status, and student attendance that affect student achievement beyond adding more instructional time. Examination of research related to …

Just Add Water: Reclamation Projects And Development Fantasies In The Upper Basin Of The Colorado River, Stephen C. Strugeon

Library Faculty & Staff Publications

The history of the development of the American West is full of countless examples of promoters seeking to encourage outside investors to buy land, invest in mines, and build railroads. The history of water projects in the region is no different. Residents of communities such as Grand Junction, Colorado, recognized early on the two-fold dilemma that they faced: irrigation and reclamation projects would be critical to the economic growth of the area, and the funding for these projects would have to be obtained from sources outside the region. The promoters of such projects relied upon booster literature in order to …

Matrix Model Superpotentials And Ade Singularities, Carina Curto

Department of Mathematics: Faculty Publications

We use F. Ferrari’s methods relating matrix models to Calabi–Yau spaces in order to explain much of Intriligator and Wecht’s ADE classification of N = 1 superconformal theories which arise as RG fixed points of N = 1 SQCD theories with adjoints. We find that ADE superpotentials in the Intriligator–Wecht classification exactly match matrix model superpotentials obtained from Calabi–Yau with corresponding ADE singularities. Moreover, in the additional Ô, Â, Dˆ and Ê cases we find new singular geometries. These “hat” geometries are closely related to their ADE counterparts, but feature non-isolated singularities. As a byproduct, we give simple descriptions for …

Valuations For Spike Train Prediction, Vladimir Itskov, Carina Curto, Kenneth D. Harris

Department of Mathematics: Faculty Publications

The ultimate product of an electrophysiology experiment is often a decision on which biological hypothesis or model best explains the observed data. We outline a paradigm designed for comparison of different models, which we refer to as spike train prediction. A key ingredient of this paradigm is a prediction quality valuation that estimates how close a predicted conditional intensity function is to an actual observed spike train. Although a valuation based on log likelihood (L) is most natural, it has various complications in this context. We propose that a quadratic valuation (Q) can be used as an alternative to L. …

Simulations With Elaborated Worked Example Modeling: Beneficial Effects On Schema Acquisition, Debra K. Meier, Karl J. Reinhard, David O. Carter, David W. Brooks

Department of Entomology: Faculty Publications

Worked examples have been effective in enhancing learning outcomes, especially with novice learners. Most of this research has been conducted in laboratory settings. This study examined the impact of embedding elaborated worked example modeling in a computer simulation practice activity on learning achievement among 39 undergraduate students within a classroom environment. The students from one introductory forensic science course were randomly assigned to one of two groups that worked through computer-based simulations containing worked example modeling conditions presented in varied order. The computer software administered the modeled simulations, prior knowledge test, pretest, posttests, and a second domain test. Findings from …

An Automatic Bridge Detection Technique For Multispectral Images, D. Chaudhuri, Ashok Samal

School of Computing: Conference and Workshop Papers

Extraction of features from images has been a goal of researchers since the early days of remote sensing. While significant progress has been made in several applications, much remains to be done in the area of accurate identification of high-level features such as buildings and roads. This paper presents an approach for detecting bridges over water bodies from multispectral imagery. The multispectral image is first classified into eight land-cover types using a majority-must-be-granted logic based on the multiseed supervised classification technique. The classified image is then categorized into a trilevel image: water, concrete, and background. Bridges are then recognized in …