Physical Sciences and Mathematics Commons^™

A Source Code Search Engine For Keyword Based Structural Relationship Search, Asheq Hamid

Computer Science and Engineering Theses

In an Object Oriented Program, we often see that a package contains several classes, a class contains several methods, a method calls other methods. We may say, there is a contains relationship between a package and a class or a calls relationship between two methods. We refer to these relationships as structural relationships. There may be other structural relationships apart from contains or calls in the source code. A software developer may sometime want to search for structural relationships within source code. She may prefer using Google like free form query to do so. To facilitate free form query based …

Optimization Of Energy Resolution In The Digital Hadron Calorimeter Using Longitudinal Weights, Jacob Russell Smith

Physics Dissertations

Particle physics seeks to describe matter in its most elementary structure. With lepton colliders; couplings of gauge bosons and heavy quarks, physics beyond the Standard Model, and properties of a recently discovered Higgs boson can be studied with very high precision. Particle Flow Algorithms (PFA), able to achieve necessary jet-energy and di-jet mass resolutions, require fine transverse and longitudinal segmentation from calorimeters. To validate digital imaging calorimetry in this context, a Digital Hadron Calorimeter (DHCAL) with single-bit (digital) readout on imbedded electronics from 1×1 cm2 pads throughout its volume has been constructed and exposed to particle beams as a large …

Atomic And Molecular Adsorptions Of Hydrogen And Oxygen On Silicon Nanotubes: An Ab Initio Study, Haoliang Chen

Physics Dissertations

A systematic ab initio study of silicon nanotubes (SiNTs) in single-walled, double-walled armchair and zigzag configurations will be presented. Electronic and structural properties of all these nanostructures have been calculated using hybrid density functional B3LYP and 3-21G* basis set as implemented in the GAUSSIAN 03/09 suite of software. The binding energy increases as diameter of the nanotube increases generally for both armchair and zigzag SiNTs. The HOMO-LUMO gaps of the armchair and zigzag SiNTs are in the range from 0.20 to 1.81 eV and do not show any metallic behavior. Radial buckling calculations indicate that the armchair SiNTs all have …

A Study Of Ecological And Physiological Roles Of The Termite Associated Verrucomicrobium (Tav) Strains Through A System Biology Approach, Jantiya Isanapong

Earth & Environmental Sciences Dissertations

Termite hindguts are populated by a dense and diverse community of microbial symbionts working in concert to transform lignocellulosic plant material and derived residues into acetate, to recycle and fix nitrogen, and to remove oxygen. Although much has been learned about the breadth of microbial diversity in the hindgut, the ecophysiological roles of its members is less understood. In this study, we present new information about the ecophysiology of microorganism Diplosphaera colotermitum strain TAV2, an autochthonous member of the Reticulitermes flavipes gut community. An integrated high-throughput approach was used to determine the transcriptomic and proteomic profiles of cells grown under …

Development Of A Mathematical Model, Vump (Vinasse Utilization For Methane Production), Lucina MáRcia-De-Mello Kuusisto

Earth & Environmental Sciences Dissertations

Environmental pollution causes ongoing problems. Many countries are faced with the dilemma of finding alternative energy sources that are cost-effective and environmentally friendly. Biofuels have received much attention of late as potential alternative fuels. Although biofuels are indeed attractive energy sources, their manufacturing also brings environmental pollution. One of the most prominent biofuels is ethanol. In the US, the main feedstock for ethanol manufacturing is corn. In Brazil, as well as in some other countries, the main raw material is sugarcane. Although ethanol presents many advantages as a biofuel, including the fact that it is manufactured from renewable resources, there …

Viewpoint Invariant Gesture Recognition And 3d Hand Pose Estimation Using Rgb-D, Paul Doliotis

Computer Science and Engineering Dissertations

The broad application domain of the work presented in this thesis is pattern classifi-cation with a focus on gesture recognition and 3D hand pose estimation. One of the main contributions of the proposed thesis is a novel method for 3D hand pose estimation using RGB-D. Hand pose estimation is formulated as a database retrieval problem. The proposed method investigates and introduces new similarity measures for similarity search in a database of RGB-D hand images. At the same time, towards making 3D hand pose estimation methods more automatic, a novel hand segmentation method is introduced which also relies on depth data. …

Motion And Rigidity Of The Caribbean Plate And Geodetic Observations Of Dominica, Lesser Antilles, Jamie Annette Miller

Earth & Environmental Sciences Dissertations

The currently accepted kinematic model of the Caribbean plate presented by DeMets et al. (2007), is based on velocities from 6 continuous and 14 campaign GPS sites. This work attempts to refine the current plate model by evaluating data from an expanded number of stations with an improved spatial distribution. As a measure to better constrain the eastern margin, a study has been conducted on the island of Dominica which includes campaign GPS data collected over the last decade. The analysis of data from 117 sites includes campaign data in addition to the data from the continuous GPS stations that …

Appalachian Delta Plain Paleoecology Of The Cretaceous Woodbine Formation At The Arlington Archosaur Site, North Texas, Derek Jason Main

Earth & Environmental Sciences Dissertations

The Arlington Archosaur Site (AAS) is a North Texas fossil locality that preserves a Mid- Cretaceous ecosystem along a low lying coastal plain. The site lies within the Cenomanian (95 Mya) rocks of the Woodbine Formation in North Arlington, Tarrant County, TX. The depositional environment of the AAS is a coastal delta plain, principally a peat bog. The vertebrates recovered from the AAS include dinosauria (ornithopod and theropod), crocodyliform, chelonian and dipnoan. A large, nearly complete crocodyliform was excavated in the summer of 2009, and proved to be a new taxon; Deltasuchus motherali. The name of the new taxon was …

Smooth Quantile Processes For Right Censored Data, Katsuhiro Uechi

Mathematics Dissertations

The development of an estimator of a quantile function Q(p) is discussed. The smooth nonparametric estimator Qn(p) of a quantile function Q(p) is defined as the solution to Fn(Qn(p)) = p, where Fn is a smooth Kaplan-Meier estimator of an unknown continuous distribution function F(x). The asymptotic properties of the smooth quantile process, n(Qn(p) - Q(p)) , based on right censored lifetimes are studied. The asymptotic properties of the bootstrap quantile process, n(Q n(p) - Q(p)) are also investigated and shown to have the same limiting distribution as the smooth quantile process. The bootstrap method to approximate the sampling distribution …

Effects Of Discrete Time Delays And Parameters Variation On Dynamical Systems, Ibrahim Oumar Diakite

Mathematics Dissertations

To understand the effects of discrete time delays and of parameters variation on certain biological system models, we first consider a Delay Differential Equation model of human immunodeficiency virus (HIV). We investigate the effects of the discrete time on the virulence of the HIV strain, and present sufficient and necessary condition for the virulence of the pathogen to change as the time delay changes. We also consider the same delay differential model for HIV infection, and we investigate analytically and numerically the stability of the endemically infected equilibrium. Our analysis shows that certain key parameters, such as the rate of …

Haplotype-Based Statistical Inference For Case-Control Genetic Association Studies With Complex Sampling, Daoying Lin

Mathematics Dissertations

With the advances in human genome research, it is now believed that the risks of many complex diseases are triggered by the interplay of genetic susceptibilities and environmental exposures. The population-based case-control study (PBCCS) is widely used to investigate the role of genetic variants and environmental exposures in the etiology of complex diseases. There are numerous ways to implement the selection process of cases and controls. In its simplest form, a simple random sampling (SRS) design is used to choose cases and controls from diseased and disease-free population, respectively. Though SRS is easy to conduct and relevant statistical methodologies are …

The Polynomial Chaos Method With Applications To Random Differential Equations, Juan Antonio Licea Salazar

Mathematics Dissertations

The role of randomness in mathematical models is of paramount importance, with emphasis placed upon the accuracy and reliability of predictions a rational approach is the use of differential equations with random parameters to describe natural phenomena. Well known methods such as Monte Carlo methods and the method of moments have been implemented to approximate the solutions to random differential equations in the last few decades. In this work, analytic solutions to a particular Riccati type dierential equation and discrete delay dierential equation with random coefficients are derived, also, due to its spectral rate of convergence and simplicity, the polynomial …

Applications And Adaptations Of A Globally Convergent Numerical Method In Inverse Problems, Aubrey Rhoden

Mathematics Dissertations

In our terminology "globally convergent numerical method" means a numerical method whose convergence to a good approximation of the correct solution is independent of the initial approximation in inverse problems. A numerical imaging algorithm has been proposed to solve a coecient inverse problem for an elliptic equation and then the algorithm is validated with the data generated by computer simulation. Previouswork in this eld was focused on the steady-state optical problem with multiple source positions moving along a straight line as well as the frequency domain problem with sweeping frequency. This work includes the steady-state thermal tomography problem with multiple …

The Generalized Two-Component Hunter-Saxton System, Byungsoo Moon

Mathematics Dissertations

This thesis is concerned with the generalized two-component Hunter-Saxton system. In the periodic setting, we study the wave-breaking phenomenon and global existence for the generalized two-component Hunter-Saxton system. We obtain a brief derivation of the model. We also briefly sketch a standard local well-posednessresult using Kato's semigroup approach. We establish a wave-breaking criterion for solutions and some interesting results of wave-breaking solutions with certain initial profiles. We demonstrate the exact blow-up rate of strong solutions. Finally, we give a sufficient condition for global solutions.

High Order Numerical Schemes For Pdes And Applications To Cfd, Huankun Fu

Mathematics Dissertations

In the past two decades, many efforts have been made in developing high-order schemes with high resolution, such as compact scheme, essentially non-oscillatory scheme (ENO), weighted essentially non-oscillatory scheme (WENO).The present dissertation comprises the analysis and numerical testing of two high order methods. The first one refers to the modification of pseudo spectral method which can be used to partial differential equations(PDEs) with non-periodic boundary conditions. The second one is in high order finite difference class and is the mixing of weighted non-oscillatory scheme and compact scheme (MWCS) with using global weights instead of local ones. Numerical tests are performed …

Numerical Studies For M-Matrix Algebraic Riccati Equations, Weichao Wang

Mathematics Dissertations

A new doubling algorithm - Alternating-Directional Doubling Algorithm (ADDA) - is developed for computing the unique minimal nonnegative solution of an M-Matrix Algebraic Riccati Equation (MARE). It is argued by both theoretical analysis and numerical experiments that ADDA is always faster than two existing doubling algorithms - SDA of Guo, Lin, and Xu (Numer. Math., 103 (2006), pp. 393-412) and SDA-ss of Bini, Meini, and Poloni (Numer. Math., 116 (2010), pp. 553-578) for the same purpose. A deflation technique is then presented for an irreducible singular M-matrix Algebraic Riccati Equation (MARE). The technique improves the rateof convergence of a doubling …

Gis Data: City Of Suffolk, Virginia Tidal Marsh Inventory, Marcia Berman, Karinna Nunez, Sharon Killeen, Tamia Rudnicky, Kory Angstadt, David Weiss, Carl H. Hershner

Data

The 2013 Tidal Marsh Inventory update for City of Suffolk, Virgnia was generated using on-screen digitizing techniques in the most recent version of ArcGIS® - ArcMap while viewing conditions observed in the most recent imagery from the Virginia Base Mapping Program (VBMP). Dominant plant community types were primarily determined during field surveys from shallow-draft boats moving along the shoreline. Land-based surveys were performed in some locations. One shapefile is developed that portrays tidal marsh areas represented as polygons. A metadata file accompanies the shapefile to define attribute accuracy, data development, and any use restrictions that pertain to the data.

Gis Data: City Of Poquoson, Virginia Tidal Marsh Inventory, Marcia Berman, Karinna Nunez, Sharon Killeen, Tamia Rudnicky, Carl H. Hershner, David Stanhope, David Weiss, Julie Bradshaw, Christine Tombleson

Data

The 2013 Tidal Marsh Inventory update for the City of Poquoson, Virginia was generated using on-screen digitizing techniques in the most recent version of ArcGIS® - ArcMap while viewing conditions observed in the most recent imagery from the Virginia Base Mapping Program (VBMP). Dominant plant community types were primarily determined during field surveys from shallow-draft boats moving along the shoreline. Land-based surveys were performed in some locations. One shapefile is developed that portrays tidal marsh areas represented as polygons. A metadata file accompanies the shapefile to define attribute accuracy, data development, and any use restrictions that pertain to the data.

Gis Data: City Of Poquoson, Virgina Shoreline Inventory Report, Marcia Berman, Karinna Nunez, Sharon Killeen, Tamia Rudnicky, Carl Hershner, David Stanhope, David Weiss, Julie Bradshaw, Christine Tombleson

Data

The Shoreline Management Model is a GIS spatial model that determines appropriate shoreline best management practices using available spatial data and decision tree logic. Available shoreline conditions used in the model include the presence or absence of tidal marshes, beaches, and forested riparian buffers, bank vegetation cover, bank height, wave exposure (fetch), nearshore water depth, and proximity of coastal development to the shoreline. The model output for shoreline best management practices is displayed in the locality Comprehensive Map Viewer. One GIS shapefile is developed that describes two arcs or lines representing practices in the upland area and practices at the …

Uniform Gaussian Bounds For Subelliptic Heat Kernels And An Application To The Total Variation Flow Of Graphs Over Carnot Groups, Luca Capogna, Giovanna Citti, Maria Manfredini

Luca Capogna

In this paper we study heat kernels associated with a Carnot group G, endowed with a family of collapsing left-invariant Riemannian metrics σε which converge in the Gromov- Hausdorff sense to a sub-Riemannian structure on G as ε→ 0. The main new contribution are Gaussian-type bounds on the heat kernel for the σε metrics which are stable as ε→0 and extend the previous time-independent estimates in [16]. As an application we study well posedness of the total variation flow of graph surfaces over a bounded domain in a step two Carnot group (G; σε ). We establish interior and boundary …

Syllabus_Lecture_Notes_Collective_Phenomena_In_Laser_Plasmas_Phy998_2_Fall_2013, Serge Y. Kalmykov

Serge Youri Kalmykov

Interaction of high-power laser radiation with rarefied, fully ionized plasmas is rich in nonlinear collective phenomena. It is essentially three-dimensional and is dominated by the excitation of various modes of plasma oscillations, most important of which are electron Langmuir waves. These waves may trap externally injected electrons or initially quiescent plasma electrons, accelerating them to GeV-scale energies. Laser pulses can also launch collisionless shocks, which may accelerate plasma ions to MeV energies. Furthermore, relativistic mass effect and electron density perturbations by the radiation pressure cause laser pulse self-focusing and filamentation, leading to the radiation pulse self-guiding over many Rayleigh lengths. …

Hydrodynamics And Morphology Of Equilibrium Tidal Freshwater Channels, Carl Friedrichs

Presentations

This presentation addresses the dynamics and morphology of near-equilibrium tidal freshwater channels. The dynamics considered are based on sectionally-averaged current velocity and a barotropic momentum balance. A series of geometries are examined which attempt to encompass generic, reasonably realistic scenarios for tidal fresh water channels found in nature. This work presents and scales the governing equations of mass and momentum conservation. An essential step in this process is the identification of key length scales, corresponding inverse length scales (or "spatial rates of change"), and dimensionless ratios to be used subsequently to determine when and where to keep or neglect various …

2011 Chesapeake Bay Sav Coverage, Sav Data Administrator, Virginia Institute Of Marine Science

Data

Abstract: The 2011 Chesapeake Bay SAV Coverage was mapped from 1:24,000 black and white aerial photography to assess water quality in the Bay. Each area of SAV was interpreted from the rectified photography and classified into one of four density classes by the percentage of cover. The SAV beds were entered into an SDE GIS fetaure class using the quality control procedures documented below. The dataset contains all SAV areas that were identified from the areas flown. Some areas that are presumed to contain no SAV were not flown. Some small beds, particularly along narrow tributaries may not have been …

Evaluating The Capabilities Of The Second Generation Pics Settling Column Floc Camera In A Muddy Tidal Estuary, York River, Virginia, Usa, Grace M. Cartwright, S. Jarrell Smith, Carl T. Friedrichs, Kelsey A. Fall

Presentations

No abstract provided.

Acoustic Scattering To Measure Dispersed Oil Droplet Size And Sediment Particle Size, Paul D. Panetta, Leslie Bland, Grace M. Cartwright, Carl T. Friedrichs

Presentations

No abstract provided.

Dual Use Of A Sediment Mixing Tank For Calibrating Acoustic Backscatter And Direct Doppler Measurement Of Settling Velocity, Grace M. Cartwright, Carl T. Friedrichs, Paul D. Panetta

Presentations

While the Acoustic Doppler Velocimeter (ADV) is designed to determine fluid velocity, it is important to recognize that it is actually the velocity of the scatterers themselves that is measured. Thus in a calibration tank designed to relate sediment-induced backscatter to sediment concentration, the vertical velocity registered by an ADV at a given point is actually the true fluid velocity plus the sediment’s settling velocity. And absent net vertical volume flux, the average vertical velocity registered by an ADV across a horizontal plane is equal to the mean sediment settling velocity. For this study, a series of ADV calibrations were …

How To Create A Two-Component Spinor, Charles G. Torre

How to... in 10 minutes or less

Let (M, g) be a spacetime, i.e., a 4-dimensional manifold M and Lorentz signature metric g. The key ingredients needed for constructing spinor fields on the spacetime are: a complex vector bundle E -> M ; an orthonormal frame on TM ; and a solder form relating sections of E to sections of TM (and tensor products thereof). We show how to create a two-component spinor field on the Schwarzschild spacetime using the DifferentialGeometry package in Maple. PDF and Maple worksheets can be downloaded from the links below.

The Octonions And The Exceptional Lie Algebra G2, Ian M. Anderson

Research Vignettes

The octonions O are an 8-dimensional non-commutative, non-associative normed real algebra. The set of all derivations of O form a real Lie algebra. It is remarkable fact, first proved by E. Cartan in 1908, that the the derivation algebra of O is the compact form of the exceptional Lie algebra G2. In this worksheet we shall verify this result of Cartan and also show that the derivation algebra of the split octonions is the split real form of G2.

PDF and Maple worksheets can be downloaded from the links below.

Higher Order Symmetries Of The Kdv Equation, Ian M. Anderson

Research Vignettes

In this worksheet we symbolically construct the formal inverse of the total derivative operator and use it to construct the recursion operator for the higher-order symmetries of the KdV equation. Using this recursion operator we generate the first 5 generalized symmetries of the KdV equation and verify that they all commute.

PDF and Maple worksheets can be downloaded from the links below.

Molecule For Electronics: A Myriad Of Opportunities Comes With Daunting Challenges, Ranjit Pati

Department of Physics Publications

Since the invention of Integrated Circuit (IC) in 1958, we have seen an unprecedented growth in Si-based electronics industry; ICs are currently used in almost all electronic gadgets. However, it is now very much clear that this era of growth we have been witnessing for the last five decades will soon hit the brick wall, once the transistor size reaches the physical limit of miniaturization.