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Articles 1  30 of 1173
FullText Articles in Physical Sciences and Mathematics
Polyhedral Oligomeric SilsesquioxanePhosphate Glass Matrix Nanocomposites With Additional Chapter On Phosphate GlassPoly(Ethylene Terephthalate) Matrix Composites, Kyoungtae Kim
Dissertations
Preparation and characterization of tin fluorophosphate glass (Pglass) matrix nanocomposites incorporating polyhedral oligomeric silsesquioxane (POSS) were investigated on the structural, thermal, morphological, mechanical, and rheological properties. Various processes including synthesis, extrusion and sintering processes were applied to prepare the nanocomposite samples. Another application of POSS with hydrophobic functional groups on the wellstructured nanoscale silicate cage with three silanol groups was investigated to present the feasibility to use POSS molecule as a coating material on the surface of the hydrophilic inorganic glass. In addition, Poly(ethylene terephthalate) polymer matrix composites incorporating Pglass was studied to present the benefits of the Pglass ...
Computational Modeling Of Radiation Interactions With Molecular Nitrogen, Tyler Reese
Computational Modeling Of Radiation Interactions With Molecular Nitrogen, Tyler Reese
Dissertations
The ability to detect radiation through identifying secondary effects it has on its surrounding medium would extend the range at which detections could be made and would be a valuable asset to many industries. The development of such a detection instrument requires an accurate prediction of these secondary effects. This research aims to improve on existing modeling techniques and help provide a method for predicting results for an affected medium in the presence of radioactive materials. A review of radioactivity and the interactions mechanisms for emitted particles as well as a brief history of the Monte Carlo Method and its ...
A New Generation Of Functional Polyisobutylenes For Advanced Applications, Corey M. Parada
A New Generation Of Functional Polyisobutylenes For Advanced Applications, Corey M. Parada
Dissertations
Polyisobutylene (PIB) is a fully saturated, aliphatic polymer of high commercial importance due to its superior gas barrier properties and high chemical/oxidative stability. One commercial enduse for PIB is in insulated glass windows (IGU), where it acts as a gas/moisture barrier and sealant. Under certain adverse conditions, catastrophic failure of the PIB sealant may result in aesthetic and functional failure of the IGU, which necessitates replacement of the unit. Thus, there exists a need to improve current generations of thermoplastic PIB sealants to be able to withstand the harsh environments found in current realworld applications.
In the first ...
Predicted Deepwater Bathymetry From Satellite Altimetry: NonFourier Transform Alternatives, Maxsimo Salazar
Predicted Deepwater Bathymetry From Satellite Altimetry: NonFourier Transform Alternatives, Maxsimo Salazar
Dissertations
Robert Parker (1972) demonstrated the effectiveness of Fourier Transforms (FT) to compute gravitational potential anomalies caused by uneven, nonuniform layers of material. This important calculation relates the gravitational potential anomaly to seafloor topography. As outlined by Sandwell and Smith (1997), a sixstep procedure, utilizing the FT, then demonstrated how satellite altimetry measurements of marine geoid height are inverted into seafloor topography. However, FTs are not local in space and produce Gibb’s phenomenon around discontinuities. Seafloor features exhibit spatial locality and features such as seamounts and ridges often have sharp inclines. Initial tests compared the windowedFT to wavelets in reconstruction ...
Effect Of Network Structure On Free Volume And Gas Transport Properties Of ThiolEne And EpoxyAmine Networks, Ramesh Krishnan Ramakrishnan
Effect Of Network Structure On Free Volume And Gas Transport Properties Of ThiolEne And EpoxyAmine Networks, Ramesh Krishnan Ramakrishnan
Dissertations
Network parameters such as crosslink density or intermolecular interactions were used as effective parameters to control polymer chain packing or free volume and thereby control the mass transport properties of networks.
A series of polyethylene glycol (PEG) based thiolene elastomeric networks having a broad range of molecular weight between crosslinks, M_{c}, (inverse of crosslink density) was prepared. The specific volume of the networks was studied as a function of temperature and pressure using high pressure dilatometry, and the obtained PVT data was fit using SimhaSomcynsky equation of state (SS eos) analysis. Fractional free volume, quantified through SS eos analysis ...
Novel Image Descriptors And Learning Methods For Image Classification Applications, Ajit Puthenputhussery
Novel Image Descriptors And Learning Methods For Image Classification Applications, Ajit Puthenputhussery
Dissertations
Image classification is an active and rapidly expanding research area in computer vision and machine learning due to its broad applications. With the advent of big data, the need for robust image descriptors and learning methods to process a large number of images for different kinds of visual applications has greatly increased. Towards that end, this dissertation focuses on exploring new image descriptors and learning methods by incorporating important visual aspects and enhancing the feature representation in the discriminative space for advancing image classification.
First, an innovative sparse representation model using the complete marginal Fisher analysis (CMFASR) framework is proposed ...
Applications Of Big Knowledge Summarization, Ling Zheng
Applications Of Big Knowledge Summarization, Ling Zheng
Dissertations
Advanced technologies have resulted in the generation of large amounts of data ("Big Data"). The Big Knowledge derived from Big Data could be beyond humans' ability of comprehension, which will limit the effective and innovative use of Big Knowledge repository. Biomedical ontologies, which play important roles in biomedical information systems, constitute one kind of Big Knowledge repository. Biomedical ontologies typically consist of domain knowledge assertions expressed by the semantic connections between tens of thousands of concepts. Without some highlevel visual representation of Big Knowledge in biomedical ontologies, humans cannot grasp the "big picture" of those ontologies. Such Big Knowledge orientation ...
Theoretical Studies Of Photoinduced Dynamics And Topological States In Materials With Strong ElectronLattice Couplings, Linghua Zhu
Dissertations
First, we study the nonequilibrium dynamics of photoinduced phase transitions in charge ordered (CO) systems with a strong electronlattice interaction and analyze the interplay between electrons, periodic lattice distortions, and a phonon thermal reservoir. Simulations based on a tightbinding Hamiltonian and Boltzmann equations reveal partially decoupled oscillations of the electronic order parameter and the periodic lattice distortion during CO melting, which becomes more energy efficient with lower photon energy. The cooling rate of the electron system correlates with the CO gap dynamics, responsible for an order of magnitude decrease of the cooling rate upon the gap reopening. The work also ...
Geotraces And Beyond: Studies Of Trace Elements In Coastal And Open Ocean Waters With An Emphasis On The Effects Of Oxygen Depletion And Hydrothermal Plumes, Peng Ho
Dissertations
We investigated various dissolved trace element (dTE) distributions in two distinct areas: the coastal northern Gulf of Mexico and the eastern tropical Pacific Ocean.
A multiyear (2007‒2011) chemical time series of eight stations in the western Mississippi Sound (MS) and northwestern Mississippi Bight (MB) was undertaken to examine the factors affecting chemical distributions in this dynamic region. Key findings include the frequent development of bottom water hypoxia in MB during late springsummer, the likely contribution of submarine groundwater discharge (SGD) to the material flows, and observation of effects of episodic events including tropical storms and the opening of the ...
The Feasibility Of Using Inherent Optical Properties And The Apparent Optical Property Remote Sensing Reflectance To Estimate Suspended Particulate Matter, Particularly For Use In Airborne Hydrographic Surveys, Sarah Epps
Dissertations
Airborne hydrographic surveys are routinely used to create and update nautical charts around the world. This research is intended to assist in maximizing the utility of the data products made available from those surveys in accordance with the current survey–once, use–many–times initiatives. Specifically, this project evaluates the feasibility of using the data available airborne hydrographic systems that utilize bathymetric lasers and hyperspectral sensors to estimate the concentration of suspended particulate matter (SPM). SPM is sometimes also called suspended sediment. The ability to chart spatial distributions of SPM utilizing hydrographic survey systems already in operation will assist researchers ...
Probabilistic And Extremal Problems In Combinatorics, Sean English
Probabilistic And Extremal Problems In Combinatorics, Sean English
Dissertations
Graph theory as a mathematical branch has been studied rigorously for almost three centuries. In the past century, many new branches of graph theory have been proposed. One important branch of graph theory involves the study of extremal graph theory. In 1941, Turán studied one of the first extremal problems, namely trying to maximize the number of edges over all graphs which avoid having certain structures. Since then, a large body of work has been created in the study of similar problems. In this dissertation, a few different extremal problems are studied, but for hypergraphs rather than graphs. In particular ...
Adaptive Meshfree Methods For Partial Differential Equations, Jaeyoun Oh
Adaptive Meshfree Methods For Partial Differential Equations, Jaeyoun Oh
Dissertations
There are many types of adaptive methods that have been developed with different algorithm schemes and definitions for solving Partial Differential Equations (PDE). Adaptive methods have been developed in meshbased methods, and in recent years, they have been extended by using meshfree methods, such as the Radial Basis Function (RBF) collocation method and the Method of Fundamental Solutions (MFS). The purpose of this dissertation is to introduce an adaptive algorithm with a residual type of error estimator which has not been found in the literature for the adaptive MFS. Some modifications have been made in developing the algorithm schemes depending ...
Investigation Of Vaporization Enthalpies And Vapor Pressures Of Organic Compounds By Correlation Gas Chromatography, Carissa Nelson
Investigation Of Vaporization Enthalpies And Vapor Pressures Of Organic Compounds By Correlation Gas Chromatography, Carissa Nelson
Dissertations
Thermodynamic properties of organic compounds are useful to scientists and manufacturers in many areas of research and technology. This work focuses on measuring and reporting these properties on materials of commercial, environmental and scientific interest. Vaporization enthalpies and vapor pressures of several organic compounds have been studied using correlation gas chromatography (CGC) and are reported here as well as in recent publications. The CGC method allows for the indirect measurement of these properties in instances where these materials are available only in mixtures or in very small amounts.
The qualities of these measurements for any chosen target are directly related ...
The Effect Of An Historical Geology Course On Students’ Attitudes Towards Science And Their Knowledge Of Deep Time As A Threshold To Their Knowledge Of Evolution, Allan Nolan
Dissertations
In America there exists a conflict between a small group of its citizens and the concept of evolution. Researchers have studied this conflict and the ways in which teachers might approach educational methodologies that not only address evolution in a sensitive manner, but also remain legally acceptable.
This research was designed to address teaching evolution in the context of deep time – the concept that time is vast and that geology and biology operate in a timescale of hundreds of millions to billions of years. In previous peerreviewed works, it has been stated that deep time acts as a threshold concept ...
Graceful Colorings And Connection In Graphs, Alexis D. Byers
Graceful Colorings And Connection In Graphs, Alexis D. Byers
Dissertations
For a graph G of size m, a graceful labeling of G is an injective function f : V (G) →
{0, 1, . . . , m} that gives rise to a bijective function f ^{1} : E(G) → {1, 2, . . . , m} defined by f ^{1}(uv) = f (u) − f (v). A graph is graceful if it has a graceful labeling. Over the years, a number of variations of graceful labelings have been introduced, some of which have been described in terms of colorings.
A proper (vertex) coloring of a graph G is an assignment of colors to the vertices of G such that adjacent vertices ...
A 3d Simulation Of Leukocyte Adhesion In Blood Flow, TaiHsien Wu
A 3d Simulation Of Leukocyte Adhesion In Blood Flow, TaiHsien Wu
Dissertations
It has been widely acknowledged that further understanding about the dynamics between blood cells and blood flow can help us gain more knowledge about the causes of diseases and discover more effective treatments. Examples of such dynamics include red blood cell (RBC, or erythrocyte) aggregation, white blood cell (WBC, or leukocyte) margination, and WBC extravasation. WBC extravasation is an important multiplestep process in the inflammatory response and therefore has drawn considerable attention over the past two decades. In this multiplestep process, a WBC undergoes at least four steps, including capture, rolling, firm adhesion, and transmigration, and each step is influenced ...
Induced Graph Colorings, Ian Hart
Induced Graph Colorings, Ian Hart
Dissertations
An edge coloring of a nonempty graph G is an assignment of colors to the edges of G. In an unrestricted edge coloring, adjacent edges of G may be colored the same. If every two adjacent edges of G are colored differently, then this edge coloring is proper and the minimum number of colors in a proper edge coloring of G is the chromatic index χ^{/}(G) of G. A proper vertex coloring of a nontrivial graph G is an assignment of colors to the vertices of G such that every two adjacent vertices of G are colored differently. The ...
Nanojars: Versatile Platform For Pyrazole Synthesis And Chemistry, And Selective Extraction Of Anions, Basil Mohammed Ahmed
Nanojars: Versatile Platform For Pyrazole Synthesis And Chemistry, And Selective Extraction Of Anions, Basil Mohammed Ahmed
Dissertations
This work is centered around nanojars, a family of nanosized anionincarcerating agents. It addresses various aspects of nanojar chemistry, such as synthesis strategies (including green methodologies) for pyrazole ligands needed for the preparation of nanojars, characterization and study of the mechanism of assembly of nanojars, and selective extraction of anions from water using nanojars.
Nanojars are neutral, supramolecular coordination complexes of the general formula [anion⊂ {Cu(μOH)(μpz)}_{n}], formed by the reaction of Cu^{2+}, HO^{‒} and pyrazolate ions (C_{3}H_{2}N_{2}‒, pz^{‒}) in the presence of oxoanions with large hydration energy (e.g. CO_{3 ...}
Survival Analysis Using Archimedean Copulas, Xieyang Jia
Survival Analysis Using Archimedean Copulas, Xieyang Jia
Dissertations
No abstract provided.
High Performance Cloud Computing On Multicore Computers, Jianchen Shan
High Performance Cloud Computing On Multicore Computers, Jianchen Shan
Dissertations
No abstract provided.
Numerical Simulations Of Thin Viscoelastic Films, Valeria Barra
Numerical Simulations Of Thin Viscoelastic Films, Valeria Barra
Dissertations
No abstract provided.
Polymer Nanocomposites Containing High Aspect Ratio Particulates: Innovation In CoExtruded Multilayer Barrier Films, Kevin Meyers
Polymer Nanocomposites Containing High Aspect Ratio Particulates: Innovation In CoExtruded Multilayer Barrier Films, Kevin Meyers
Dissertations
Delaminated montmorillonite (MMT) clay/ maleic anhydride grafted LLDPE nanocomposite multilayer films with alternating layers of LDPE were produced through multilayer coextrusion. The MMT concentration within the nanocomposite layers was increased through annealing the films in the melt due to a mismatch in interdiffusion rates of the polymer layers. Analysis of the nanocomposite layers upon annealing revealed that the platelets impinged upon one another resulting in significant improvement in oxygen barrier in the multilayer system, exceeding the results of bulk nanocomposites.
Model analysis demonstrated that increasing the nanoplatelet aspect ratio or initial concentration in the filled layers would lead to even ...
Development Of Rules Of Attraction For Intercalated Guest Molecules Inside Of A Hydrogen Bonded Framework, Matthew Fischer
Development Of Rules Of Attraction For Intercalated Guest Molecules Inside Of A Hydrogen Bonded Framework, Matthew Fischer
Dissertations
Supramolecular chemistry has synthesized large and small molecules which host guest molecules for several decades. What started as a way to mimic of enzymes in nature, has exploded into a sea of materials such as porous coordination polymers, lowdensity metalorganic frameworks, inclusion compounds, and hydrogen bonded frameworks. We previously designed a layered framework consisting of a metal complex with coordinate covalent ligands. These ligands have peripheral carboxylic acid groups which hydrogen bond to organic pillars containing terminal amines. The layered structure is separated by these pillars, which are closedpacked, creating 1dimensional channels able to cocrystallize molecules. There is interest in ...
Cationic Ruthenium Complexes In Catalysis: The Activation Of Propargylic Alcohols Through Electronically Tuned Complexes, Matthew James Stark
Cationic Ruthenium Complexes In Catalysis: The Activation Of Propargylic Alcohols Through Electronically Tuned Complexes, Matthew James Stark
Dissertations
With increasing complexity of metal complexes, it is of worthwhile interest to pursue systematic examinations of ligand modifications to study their impact on the reactivity of a catalyst. To that end, this study aimed to understand the effect electronwithdrawing ligands conveyed to catalytic activity in the etherification of propargylic alcohols and related reactions. A number of halfsandwich ruthenium complexes bearing ligands with varying electron–withdrawing properties were synthesized and structurally characterized. Their electronic and structural properties were investigated utilizing Xray crystallography, revealing that the series of complexes did not vary significantly in structure. The complexes were studied electronically with cyclic ...
Steric Effects On The Formation Of Manganese Oxide Clusters And 2Dimensional Ammonium Formate Architectures, Carl Oberle
Steric Effects On The Formation Of Manganese Oxide Clusters And 2Dimensional Ammonium Formate Architectures, Carl Oberle
Dissertations
It has been demonstrated by the Beatty group that altering the identity of the orthosubstituent of a dianiline counterion affects the assembly and dimensionality of a cadmiumchloride layer from 2D to 0D. This work seeks to extend this finding to metal oxide and organic hydrogenbonded materials. By systematically increasing the orthosubstituent’s size on the benzoate building block of reported manganese oxide clusters, of formula Mn_{x}O_{y}(O_{2}CR)_{z}L_{w }(where R = Alkyl, L = neutral monodentate ligand), we aim to impact the selfassembly of these materials relative to their parent forms; establishing ...
Highly Symmetric Multiple BiFrames For Curve And Surface Multiresolution Processing, Khulud Ziadi
Highly Symmetric Multiple BiFrames For Curve And Surface Multiresolution Processing, Khulud Ziadi
Dissertations
Wavelets and wavelet frames are important and useful mathematical tools in numerous applications, such as signal and image processing, and numerical analysis. Recently, the theory of wavelet frames plays an essential role in signal processing, image processing, sampling theory, and harmonic analysis. However, multiwavelets and multiple frames are more flexible and have more freedom in their construction which can provide more desired properties than the scalar case, such as short compact support, orthogonality, high approximation order, and symmetry. These properties are useful in several applications, such as curve and surface noiseremoving as studied in this dissertation. Thus, the study of ...
Evolving Specialization In An AgentBased Model Without TaskSwitching Costs, Shane Meyer
Evolving Specialization In An AgentBased Model Without TaskSwitching Costs, Shane Meyer
Dissertations
This work examines the possibility of evolving the phenotypic specialization associated with division of labor in an agentbased model without taskswitching costs. The model examines two groups competing for vital resources, where members of one group are capable of sharing resources with other agents in their group. Agents attempt to collect resources which allow them to reproduce, with more resources leading to a greater number of offspring by asexual reproduction. Four variants of the model are examined, with combinations of one or two resources and the presence of a foraging risk. The presence of the foraging risk can lead to ...
Rapid Generation Of Jacobi Matrices For Measures Modified By Rational Factors, Amber Sumner
Rapid Generation Of Jacobi Matrices For Measures Modified By Rational Factors, Amber Sumner
Dissertations
Orthogonal polynomials are important throughout the fields of numerical analysis and numerical linear algebra. The Jacobi matrix J for a family of n orthogonal polynomials is an n x n tridiagonal symmetric matrix constructed from the recursion coefficients for the threeterm recurrence satisfied by the family. Every family of polynomials orthogonal with respect to a measure on a real interval [a,b] satisfies such a recurrence. Given a measure that is modified by multiplying by a rational weight function r(t), an important problem is to compute the modified Jacobi matrix Jmod corresponding to the new measure from knowledge of ...
Using AgentBased Implementation Of Active Data Bundles For Protecting Privacy In Healthcare Information Systems, Raed M. Salih
Using AgentBased Implementation Of Active Data Bundles For Protecting Privacy In Healthcare Information Systems, Raed M. Salih
Dissertations
Sharing healthcare information—including electronic health/medical records (EHRs/EMRs)—among healthcare information systems is necessary for improving the quality of healthcare. However, facilitating data exchange increases privacy threats—due to easier copying and dissemination of healthcare information.
We propose a solution that provides privacy protection for patients’ EHRs/EMRs disseminated among different authorized healthcare information systems. Our solution builds upon the existing construct named an Active Data Bundle (ADB). In the proposed solution, ADBs keep EHRs/EMRs as sensitive data; include metadata describing sensitive data and prescribing their use; and encompass a policy enforcement engine (called a virtual machine ...
A Holistic Computational Approach To Boosting The Performance Of Protein Search Engines, Majdi Ahmad Mosa Maabreh
A Holistic Computational Approach To Boosting The Performance Of Protein Search Engines, Majdi Ahmad Mosa Maabreh
Dissertations
Despite availability of several proteins search engines, due to the increasing amounts of MS/MS data and database sizes, more efficient data analysis and reduction methods are important. Improving accuracy and performance of protein identification is a main goal in the community of proteomic research. In this research, a holistic solution for improvement in search performance is developed.
Most current search engines apply the SEQUEST style of searching protein databases to define MS/MS spectra. SEQUEST involves three main phases: (i) Indexing the protein databases, (ii) Matching and Ranking the MS/MS spectra and (iii) Filtering the matches and reporting ...