Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1 - 30 of 143119

Full-Text Articles in Physical Sciences and Mathematics

Real Analysis I, Ismail Nikoufar Dec 2105

Real Analysis I, Ismail Nikoufar

Ismail Nikoufar

Real Analysis slides for my graduate students.


Effect Of Head Group Size On The Photoswitching Applications Of Azobenzene Disperse Red 1 Analogues, Chris Corkery, Alexis Goulet-Hanssens, Arri Priimagi, Christopher Barrett Dec 2103

Effect Of Head Group Size On The Photoswitching Applications Of Azobenzene Disperse Red 1 Analogues, Chris Corkery, Alexis Goulet-Hanssens, Arri Priimagi, Christopher Barrett

Chris Corkery

No abstract provided.


Analysis Of Nonequilibrium Hcp Precipitate Growth In Fcc Matrices: Application To Al–Ag, Daniel Finkenstadt, Duane Johnson Nov 2029

Analysis Of Nonequilibrium Hcp Precipitate Growth In Fcc Matrices: Application To Al–Ag, Daniel Finkenstadt, Duane Johnson

Duane D. Johnson

Hexagonal-close-packed (hcp) γ-precipitates with large aspect ratios form rapidly in some face-centered cubic (fcc) solid-solutions. No model explains the observed time-dependent increase in aspect ratio, nor irregular intermediate growth shapes. We propose a nonequilibrium process involving trapezoidal offshoots (controlled only by energetics) that governs the growth behavior (kinetics) and yields nonequilibrium structures in agreement with observation. Then, combining nucleation theory and diffusion-limited growth both of secondary nuclei and ledges, we derive a general growth equation for γ-precipitates due to solute-segregation to precipitate–matrix interfaces that includes our modification of the Jones–Trivedi model for thickening to account for the slow ...


Securecoin: A Robust Secure And Effi#14;Cient Protocol For Anonymous Bitcoin Ecosystem, Maged H. Ibrahim Mar 2017

Securecoin: A Robust Secure And Effi#14;Cient Protocol For Anonymous Bitcoin Ecosystem, Maged H. Ibrahim

Maged Ibrahim

Bitcoin is the #12;rst decentralized peer-to-peer electronic
virtual asset and payment cryptocurrency, through which,
users can transact digital currency directly, without the
need for an intermediary (or authority), using a hashed
version of cryptographic public keys, as pseudonyms
called addresses. The Bitcoin ecosystem was supposed
to be anonymous and untraceable. However, transactions
from input to output addresses of the Bitcoin users are
observed to be linkable, therefore, missing unlinkability
as an important requirement of anonymity. Several pro-
tocols appeared to enhance Bitcoin users' anonymity and
to ensure unlinkability of input-output addresses, to make
input and output addresses of transactions ...


Ryan Caylor, Ryan Caylor Dec 2016

Ryan Caylor, Ryan Caylor

Matthew E. Wise

Ryan is a senior majoring in chemistry at Concordia University. He plans on graduating in the spring of 2017. After graduation Ryan plans on attending graduate school in the field of meteorology with an interest in becoming a weather man. Ryan is returning to the Pacific Northwest National Laboratory in the summer of 2015 to study the chemical composition of secondary organic aerosol particles. He is also a pitcher on the Concordia University baseball team.


Penalized Nonparametric Scalar-On-Function Regression Via Principal Coordinates, Philip T. Reiss, David L. Miller, Pei-Shien Wu, Wen-Yu Hua Dec 2016

Penalized Nonparametric Scalar-On-Function Regression Via Principal Coordinates, Philip T. Reiss, David L. Miller, Pei-Shien Wu, Wen-Yu Hua

Philip T. Reiss

A number of classical approaches to nonparametric regression have recently been extended to the case of functional predictors. This paper introduces a new method of this type, which extends intermediate-rank penalized smoothing to scalar-on-function regression. The core idea is to regress the response on leading principal coordinates defined by a relevant distance among the functional predictors, while applying a ridge penalty. Our publicly available implementation, based on generalized additive modeling software, allows for fast optimal tuning parameter selection and for extensions to multiple functional predictors, exponential family-valued responses, and mixed-effects models. In an application to signature verification data, the proposed ...


The Creation Of A Video Review Guide For The Free-Response Section Of The Advanced Placement Calculus Exam, Jeffrey Brown Dec 2016

The Creation Of A Video Review Guide For The Free-Response Section Of The Advanced Placement Calculus Exam, Jeffrey Brown

Honors Theses

The Creation of a Video Review Guide for the Free-Response Section of the Advanced Placement Calculus Exam follows the creation of a resource to help students prepare for the College Board’s Advanced Placement Calculus Exam. This project originated out of the authors personal experiences in preparing for this exam. The goal of the project was to create an accessible resource that reviews content, provides insights into the Advanced Placement exam, and creates successful habits in student responses. This paper, chronologically, details the development of the resource and a reflection on the final product and future uses.


Elasticity Of Cylindrical Black Holes, Conrad Pearson Dec 2016

Elasticity Of Cylindrical Black Holes, Conrad Pearson

Physics

Black holes are regions of strong gravity, and are often regarded as behaving like drops of fluid. When this line of thought is applied to cylindrical black holes (black cylinders), a mapping can be made between known instabilities for black cylinders and ordinary fluid cylinders. However, this known correlation is increasingly less accurate for lower spatial dimensions, and I seek to correct this discrepancy in this thesis. By considering soft solids instead of pure fluids, elastic energy can be included, which brings us closer to a direct comparison. In improving this mapping, it becomes possible to better understand the behavior ...


Common Core In Tennessee: An Analysis Of Eighth Grade Mathematics Standards, Hayley Little Dec 2016

Common Core In Tennessee: An Analysis Of Eighth Grade Mathematics Standards, Hayley Little

Honors Theses

Since their introduction in 2010, the Common Core State Standards (CCSS) have been a highly controversial topic in educational reform. Though the standards are not a product of the federal government and are not federally mandated, they do represent a push towards national academic standards in America. For states such as Tennessee, educational policies of the past pushed them to lower their academic standards in order to create the illusion of success. Those states are now some of the places that have seen the most change with the adoption of the CCSS. It still remains somewhat unclear, however, which changes ...


Mathematical Analysis Ii, Ismail Nikoufar Nov 2016

Mathematical Analysis Ii, Ismail Nikoufar

Ismail Nikoufar

No abstract provided.


Evaluation Of Physical And Structural Properties Of Biofield Energy Treated Barium Calcium Tungsten Oxide, Mahendra Trivedi Oct 2016

Evaluation Of Physical And Structural Properties Of Biofield Energy Treated Barium Calcium Tungsten Oxide, Mahendra Trivedi

Mahendra Kumar Trivedi

Barium calcium tungsten oxide (Ba2CaWO6) is known for its double perovskite-type crystal structure. The present study was designed to see the effect of biofield energy treatment on physical, atomic, and structural properties of Ba2CaWO6. In this study, Ba2CaWO6 powder sample was divided into two parts, one part was remained as untreated, denoted as control, while the other part was subjected to Mr. Trivedi’s biofield energy treatment and coded as treated. After that, the control and treated samples were analyzed using X-ray diffraction (XRD), surface area analyzer, Fourier transform infrared (FT-IR), and electron spin resonance (ESR) spectroscopy. The XRD data ...


Photonic Crystals With Alternate Arrays Of Rods And Holes In A Low Dielectric-Index Material, Dimitar L. Dimitrov Sep 2016

Photonic Crystals With Alternate Arrays Of Rods And Holes In A Low Dielectric-Index Material, Dimitar L. Dimitrov

All Graduate Works by Year: Dissertations, Theses, and Capstone Projects

This thesis theoretically deals with the propagation of electromagnetic waves (light beams) in periodically modulated dielectric material structures based on Maxwell’s equations. We are interested in novel light propagation characteristics in these man-made dielectric material structures for practical applications, especially on optical communications and computations. Since the wavelength range of light is on the same order of magnitude as the modulation periods of dielectric materials, an analogy of the light propagation in dielectric-constant modulated structures with the electron transport in solid-state crystals is used throughout my thesis by using a term “photonic crystals (PhCs)” referring to these dielectric structures ...


Prospective Doctoral Statement For The University Of Southern California's School Of Cinematic Arts Media Arts + Practice Program, Gabriel Leiner Aug 2016

Prospective Doctoral Statement For The University Of Southern California's School Of Cinematic Arts Media Arts + Practice Program, Gabriel Leiner

Gabriel Leiner

After visiting L.A. again and seeing the beautiful fountains on the University of Southern California's campus I am filled with all kinds of ideas about the future and brimming with energy. To all those at the University of Southern California's Cinematic Arts Department, thanks for reading my ideas over the past couple years and helping me to evolve and become a better person and a better writer. Starting a position as a doctoral student in the Media Arts + Practice Program in 2016 is an exciting opportunity. I've got a really positive outlook about Kiss The Water.


What's All The Fuss About Coding?, Tim Bell Aug 2016

What's All The Fuss About Coding?, Tim Bell

2009 - 2016 ACER Research Conferences

The idea of teaching ‘coding’ to school students has become popular, and the term appears in the names of many initiatives, such as Hour of Code and Code Club. But what do we really mean by ‘coding’, and why would you want every child to learn it? Won’t it be outdated soon? This paper looks at these issues, and why topics such as computer science are being taught to all students. This includes an assessment of misunderstandings around the idea of compulsory programming for every student, and the challenges that accompany the introduction of such topics into schools.


Acer Research Conference Proceedings (2016), Australian Council For Educational Research (Acer) Aug 2016

Acer Research Conference Proceedings (2016), Australian Council For Educational Research (Acer)

2009 - 2016 ACER Research Conferences

The focus of ACER’s Research Conference 2016 will be on what we are learning from research about ways of improving levels of STEM learning. Australia faces significant challenges in promoting improved science, technology, engineering and mathematics (STEM) learning in our schools. Research Conference 2016 will showcase research into what it will take to address these challenges, which include: the decline in Australian students’ mathematical and scientific ‘literacy’; the decline in STEM study in senior school; a shortage of highly qualified STEM subject teachers, and curriculum challenges. You will hear from researchers who work with teachers to engage students in ...


Silver-Polymer Nanocomposites, Anita N. Paul Aug 2016

Silver-Polymer Nanocomposites, Anita N. Paul

Electronic Theses and Dissertations

The objective of this research was the development of an efficient method for the preparation of silver-polymer nanocomposites containing finely dispersed silver nanoparticles. The surface of nanosilver was functionalized by thiolation with 2-aminoethanethiol. Amino-modified nanosilver was covalently bonded to polyacrylic acid, biodegradable polymers like acid terminated polylactic acid, ester terminated poly(DL-lactide-co-glycolide) and acid terminated poly(DL lactide-co-glycolide) in the presence of diisopropylcarbodiimide by carbodiimide method. Esterification of the carboxyl groups of Ag-polyacrylic acid by hydrochloric acid in methanol resulted in the formation of a stable colloidal dispersion of Ag nanoparticles in the polymer matrix. It was observed that not ...


Molecular Docking, Synthesis And Evaluation Of Pyrrolo[2,1-C][1,4]Benzodiazepines Derivatives As Non-Β-Lactam Β-Lactamases Inhibitors, Joseph Osamudiamen Osazee Aug 2016

Molecular Docking, Synthesis And Evaluation Of Pyrrolo[2,1-C][1,4]Benzodiazepines Derivatives As Non-Β-Lactam Β-Lactamases Inhibitors, Joseph Osamudiamen Osazee

Electronic Theses and Dissertations

Our research aim was to design, synthesize, and study the competitive enzyme inhibition kinetics of pyrrolo[2,1-c][1,4]benzodiazepine (PBD) derivatives as potential non-²-lactam ²-lactamase inhibitors. All compounds (1-13) passed the Lipinski’s rule of 5 test and were docked into the active site of TEM-1 ²-lactamase. PBD derivatives 1-7 were synthesized in high yields and tested for their potency against TEM-1 and P99 ²-lactamases. Kinetic data showed that compounds 1, 4, 5, and 7 possessed inhibitory activity against TEM-1 ranging from 4-34 %. Docking results revealed significant interactive spanning of the active site of TEM-1 by ...


Synthesis, Characterization And Biological Evaluation Of Pyrrolo[2,1-C][1,4]Benzodiazepines For Cytotoxicity And Serine Β-Lactamases Inhibition, Joel K. Annor-Gyamfi Aug 2016

Synthesis, Characterization And Biological Evaluation Of Pyrrolo[2,1-C][1,4]Benzodiazepines For Cytotoxicity And Serine Β-Lactamases Inhibition, Joel K. Annor-Gyamfi

Electronic Theses and Dissertations

Pyrrolo[2,1-c][1,4]benzodiazepine (PBD) derivatives possess cancerostatic and anti-infective properties thus making them candidates of possible antibacterial agents. ²-lactam antibiotics are vital weapons for the treatment of bacterial infections, but their existence and effectiveness has been faced with resistance from ²-lactamases. Therefore, the need for new effective antimicrobial drugs is very crucial. In this work, we synthesized in high yields, PBD analogs 13, 5 and 79 in three to four synthetic steps from commercially available L-proline and isatoic anhydride. MTT Assay was employed to test the in vitro cytotoxicity of PBD analogs 1, 2, 5 ...


Homological Characterizations Of Quasi-Complete Intersections, Jason M. Lutz Aug 2016

Homological Characterizations Of Quasi-Complete Intersections, Jason M. Lutz

Dissertations, Theses, and Student Research Papers in Mathematics

Let R be a commutative ring, (f) an ideal of R, and E = K(f; R) the Koszul complex. We investigate the structure of the Tate construction T associated with E. In particular, we study the relationship between the homology of T, the quasi-complete intersection property of ideals, and the complete intersection property of (local) rings.

Advisers: Luchezar L. Avramov and Srikanth B. Iyengar


Multilevel Models For Longitudinal Data, Aastha Khatiwada Aug 2016

Multilevel Models For Longitudinal Data, Aastha Khatiwada

Electronic Theses and Dissertations

Longitudinal data arise when individuals are measured several times during an ob- servation period and thus the data for each individual are not independent. There are several ways of analyzing longitudinal data when different treatments are com- pared. Multilevel models are used to analyze data that are clustered in some way. In this work, multilevel models are used to analyze longitudinal data from a case study. Results from other more commonly used methods are compared to multilevel models. Also, comparison in output between two software, SAS and R, is done. Finally a method consisting of fitting individual models for each ...


Feature Extraction To Improve Nowcasting Using Social Media Event Detection On Cloud Computing And Sentiment Analysis, David L. Kimmey Aug 2016

Feature Extraction To Improve Nowcasting Using Social Media Event Detection On Cloud Computing And Sentiment Analysis, David L. Kimmey

Masters' Theses

Nowcasting is defined as the prediction of the present, the very near future, and the very recent past using real-time data. Nowcasting with social media creates challenges because of the HACE characteristics of big data (i.e., heterogeneous, autonomous, complex, and evolving associations). Thus, this thesis proposes a feature extraction method to improve nowcasting with social media. The proposed social media event detection algorithm utilizes K-SPRE methodology and the results are processed with sentiment analysis. In addition, we develop a parallel algorithm of the methodology on a cloud environment, and we adapt an artificial neural network to build a predictive ...


Breaking Spaces And Forms For The Dpg Method And Applications Including Maxwell Equations, Carsten Carstensen, Leszek Demkowicz, Jay Gopalakrishnan Aug 2016

Breaking Spaces And Forms For The Dpg Method And Applications Including Maxwell Equations, Carsten Carstensen, Leszek Demkowicz, Jay Gopalakrishnan

Mathematics and Statistics Faculty Publications and Presentations

Discontinuous Petrov Galerkin (DPG) methods are made easily implementable using `broken' test spaces, i.e., spaces of functions with no continuity constraints across mesh element interfaces. Broken spaces derivable from a standard exact sequence of first order (unbroken) Sobolev spaces are of particular interest. A characterization of interface spaces that connect the broken spaces to their unbroken counterparts is provided. Stability of certain formulations using the broken spaces can be derived from the stability of analogues that use unbroken spaces. This technique is used to provide a complete error analysis of DPG methods for Maxwell equations with perfect electric boundary ...


Determining The Viability Of Recent Storms As Modern Analogues For North-Central Gulf Of Mexico Paleotempestology Through Sedimentary Analysis And Storm Surge Reconstruction, Joshua Caleb Bregy Aug 2016

Determining The Viability Of Recent Storms As Modern Analogues For North-Central Gulf Of Mexico Paleotempestology Through Sedimentary Analysis And Storm Surge Reconstruction, Joshua Caleb Bregy

Master's Theses

The northern Gulf of Mexico has been devastated by recent intense storms. Camille (1969) and Katrina (2005) are two notable hurricanes that made landfall in virtually the same location in Mississippi. However, fully understanding the risks and processes associated with hurricane impacts is impeded by a short and fragmented instrumental record. Paleotempestology could potentially use modern analogues from intense storms in this region to extend the hurricane record back to pre-observational time. Existing empirically based models can back-calculate surge heights over coastal systems as a function of transport distance, particle settling velocity, and gravitational acceleration. We collected cores in a ...


Correlation Of Polymer Performance And Hansen Solubility Parameters, Daniel Jobse Mania Aug 2016

Correlation Of Polymer Performance And Hansen Solubility Parameters, Daniel Jobse Mania

Master's Theses

Ready-to-use (RTU) grout is becoming more important to the finish and remodeling construction industry. Market research shows it is a fast-growing product that not only is creating its own space, but is beginning to supplant existing technology.

The original intent of this research was to investigate formulation parameters and how they affect grout performance. It was learned that particle size and oil absorption (OA) value are important filler properties that affect performance as much as adequate packing density and optimal pigment volume concentration (PVC) without going beyond critical PVC (CPVC).

Polymer architecture was also determined to be extremely important, but ...


Delay-Independent Stability Analysis Of Linear Time-Delay Systems Based On Frequency, Xianwei Li, Huijun Gao, Keqin Gu Aug 2016

Delay-Independent Stability Analysis Of Linear Time-Delay Systems Based On Frequency, Xianwei Li, Huijun Gao, Keqin Gu

SIUE Faculty Research, Scholarship, and Creative Activity

This paper studies strong delay-independent stability of linear time-invariant systems. It is known that delay-independent stability of time-delay systems is equivalent to some frequency-dependent linear matrix inequalities. To reduce or eliminate conservatism of stability criteria, the frequency domain is discretized into several sub-intervals, and piecewise constant Lyapunov matrices are employed to analyze the frequency-dependent stability condition. Applying the generalized Kalman–Yakubovich–Popov lemma, new necessary and sufficient criteria are then obtained for strong delay-independent stability of systems with a single delay. The effectiveness of the proposed method is illustrated by a numerical example.


Krylov Subspace Spectral Method With Multigrid For A Time-Dependent, Variable-Coefficient Partial Differential Equation, Haley Renee Dozier Aug 2016

Krylov Subspace Spectral Method With Multigrid For A Time-Dependent, Variable-Coefficient Partial Differential Equation, Haley Renee Dozier

Master's Theses

Krylov Subspace Spectral (KSS) methods are traditionally used to solve time-dependent, variable-coefficient PDEs. They are high-order accurate, component-wise methods that are efficient with variable input sizes.

This thesis will demonstrate how one can make KSS methods even more efficient by using a Multigrid-like approach for low-frequency components. The essential ingredients of Multigrid, such as restriction, residual correction, and prolongation, are adapted to the timedependent case. Then a comparison of KSS, KSS with Multigrid, KSS-EPI and standard Krylov projection methods will be demonstrated.


An Investigation Into Factors Influencing Attitude Toward A Wildlife Corridor, Erin Kubicek Aug 2016

An Investigation Into Factors Influencing Attitude Toward A Wildlife Corridor, Erin Kubicek

Dissertations & Theses in Natural Resources

Habitat fragmentation poses a serious threat to biodiversity in eastern Nebraska. Today, over 98% of Nebraska’s tall-grass prairie has been lost and what remains exists mostly as remnants less than 80 acres in size. The Prairie Corridor on Haines Branch will be one of the first human-made wildlife corridors in eastern Nebraska with expansion of prairie habitat as one of its main goals. Although still in the planning stages, the Prairie Corridor is a rare opportunity to explore public attitude toward a conservation-related program prior to its official launch. The purpose of this study is to explore the potential ...


Applications Of Discrete Mathematics For Understanding Dynamics Of Synapses And Networks In Neuroscience, Caitlyn Parmelee Aug 2016

Applications Of Discrete Mathematics For Understanding Dynamics Of Synapses And Networks In Neuroscience, Caitlyn Parmelee

Dissertations, Theses, and Student Research Papers in Mathematics

Mathematical modeling has broad applications in neuroscience whether we are modeling the dynamics of a single synapse or the dynamics of an entire network of neurons. In Part I, we model vesicle replenishment and release at the photoreceptor synapse to better understand how visual information is processed. In Part II, we explore a simple model of neural networks with the goal of discovering how network structure shapes the behavior of the network.

Vision plays an important role in how we interact with our environments. To fully understand how visual information is processed requires an understanding of the way signals are ...


An Extendable Visualization And User Interface Design For Time-Varying Multivariate Geoscience Data, Yanfu Zhou Aug 2016

An Extendable Visualization And User Interface Design For Time-Varying Multivariate Geoscience Data, Yanfu Zhou

Computer Science and Engineering: Theses, Dissertations, and Student Research

Geoscience data has unique and complex data structures, and its visualization has been challenging due to a lack of effective data models and visual representations to tackle the heterogeneity of geoscience data. In today’s big data era, the needs of visualizing geoscience data become urgent, especially driven by its potential value to human societies, such as environmental disaster prediction, urban growth simulation, and so on. In this thesis, I created a novel geoscience data visualization framework and applied interface automata theory to geoscience data visualization tasks. The framework can support heterogeneous geoscience data and facilitate data operations. The interface ...


Characterization Of Etbe + Cl And Isooctane + Cl Combustion Products Using Synchrotron Photoionization, Rong Yao Aug 2016

Characterization Of Etbe + Cl And Isooctane + Cl Combustion Products Using Synchrotron Photoionization, Rong Yao

Master's Theses

The low temperature (298 – 700 K) oxidation characterizations of a series of fuel additives (ETBE and isooctane) were studied at advanced light source in Lawrence Berkley National lab, using a multiplexed chemical kinetics photoionization mass spectrometer with tunable synchrotron radiation. Using Cl atoms as initiators in presence of oxygen, photoionization data were collected. Data analysis was performed via characterization of the reaction species photoionization spectra and kinetic traces, from which the products and also the intermediates were identified. Relevant reaction dynamics on potential energy surfaces were calculated, reaction enthalpies of each individual step were presented using the CBS-QB3 composite model ...