Physical Sciences and Mathematics Commons^™

The Principle Of Linearized Stability For Size-Structured Population Models, M. El-Doma

Applications and Applied Mathematics: An International Journal (AAM)

The principle of linearized stability for size-structured population dynamics models is proved giving validity to previous stability results reported in, for example, El-Doma (2008-1). In particular, we show that if all the roots of the characteristic equation lie to the left of the imaginary axis then the steady state is locally exponentially stable, and on the other hand, if there is at least one root that lies to the right of the imaginary axis then the steady state is unstable. We also point out cases when there is resonance

Sensitivity Of The Frozen/Melted Basal Boundary To Perturbations Of Basal Traction And Geothermal Heat Flux : Isunnguata Sermia, Western Greenland, Douglas John Brinkerhoff, Toby Warren Meierbachtol, Jesse Johnson, Joel T. Harper

Computer Science Faculty Publications

A full-stress, thermomechanically coupled, numerical model is used to explore the interaction between basal thermal conditions and motion of a terrestrially terminating section of the west Greenland ice sheet. The model domain is a two-dimensional flowline profile extending from the ice divide to the margin. We use data-assimilation techniques based on the adjoint model in order to optimize the basal traction field, minimizing the difference between modeled and observed surface velocities. We monitor the sensitivity of the frozen/melted boundary (FMB) to changes in prescribed geothermal heat flux and sliding speed by applying perturbations to each of these parameters. The FMB …

Modeling 5 Years Of Subglacial Lake Activity In The Macayeal Ice Stream (Antarctica) Catchment Through Assimilation Of Icesat Laser Altimetry, Sasha P. Carter, Helen A. Fricker, Donald D. Blankenship, Jesse V. Johnson, William Lipscomb, Stephen F. Price, Duncan A. Young

Computer Science Faculty Publications

Subglacial lakes beneath Antarctica’s fast-moving ice streams are known to undergo ~1km³ volume changes on annual timescales. Focusing on the MacAyeal Ice Stream (MacIS) lake system, we create a simple model for the response of subglacial water distribution to lake discharge events through assimilation of lake volume changes estimated from Ice, Cloud and land Elevation Satellite (ICESat) laser altimetry. We construct a steady-state water transport model in which known subglacial lakes are treated as either sinks or sources depending on the ICESat-derived filling or drainingrates. The modeled volume change rates of five large subglacial lakes in the downstream portion …

High-Resolution Study Of Layering Within The Percolation And Soaked Facies Of The Greenland Ice Sheet, Joel Brown, Joel T. Harper, W. Tad Pfeffer, Neil Humphrey, John H. Bradford

Geosciences Faculty Publications

Within the percolation and soaked facies of the Greenland ice sheet, the relationship between radar-derived internal reflection horizons and the layered structure of the firm column is unclear. We conducted two small-scale ground-penetrating radar (GPR) surveys in conjunction with 10 m firm cores that we colleced within the percolation and soaked facies of the Greenland ice sheet. The two surveys were separated by the distance of about 50 km and about 340 m of elevation leading to about 40 days of difference in the duration of average annual melt. At the higher site (about 1997 ma.s.l.), which receives less melt, …

Chemistry Division, William Armstrong

Sci-Tech News

No abstract provided.

Maxwell's Equations, Part Iv, David W. Ball

Chemistry Faculty Publications

In this column, we continue our explanation of Maxwell’s equations, the seminal classical explanation of electricity and magnetism (and, ultimately, light). For those of you new to the series, consider finding the last few appearances of this column to get caught up. Alternately, you should be able to find past columns on our website, www.spectroscopymag.com and look for “The Baseline” link. Words of warning: for my own reasons, the figures are being numbered sequentially through this series of columns, which is why the first figure in this column is numbered 26. Also, we’re going to get a bit mathematical. Unfortunately …

Influence Of Ionic Mobile Phase Additives With Low Charge Delocation On The Retention Of Ionic Analytes In Reversed Phase Hplc, Cesar Florez

Seton Hall University Dissertations and Theses (ETDs)

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Single Particle And Ensemble Spectroscopy Of Conjugated Polymer Nanoparticles And Their Development For Photodynamic Therapy, Jennifer Grimland

All Dissertations

Energy transport in conjugated polymers is the combination of energy transfer and exciton diffusion. There is considerable ongoing research in this field, converging to develop better organic photovoltaics, polymer light emitting diodes (PLEDs) and organic solar cells, to name a few. One way these phenomena can be explored is by doing solution dependent studies on conjugated polymer nanoparticles. With experiments on CP dots in an aqueous solution and the addition of a water miscible organic solvent in varying concentrations, dynamics occurring in the folding process can be better understood, and also exciton and fluorescence quenching properties can be extracted as …

The Toxicity Of Carbon Nanotubes To Daphnia Magna, Aaron Edgington

All Dissertations

A particle is classified as nano in size if it has at least one dimension less than 100 nm which gives them chemical and physical characteristics that are different from the bulk material. Over the last twenty years nanotechnology has exploded as an industry. It has been estimated that there are 1000 consumer products on the market today that contain nanomaterials and 2 million jobs worldwide will be devoted directly to nanotechnology research, development, and product manufacturing by 2015. Carbon nanotubes (CNTs) can be visualized as sheets of graphene rolled into a cylinder. Carbon nanotubes small diameter (nanometer scale) and …

Mechanical And Modular Verification Condition Generation For Object-Based Software, Heather Harton

All Dissertations

The foundational goal of this work is the development of mechanizable proof rules and a verification condition generator based on those rules for modern software. The verification system will be modular so that it is possible to verify the implementation of a component relying upon only the specifications of underlying components that are reused. The system must enable full behavioral verification. The proof rules used to generate verification conditions (VCs) of correctness must be amenable to automation. While automation requires software developers to annotate implementations with assertions, it should not require assistance in the proofs. This research has led to …

Modification And Characterization Of Fluorescent Conjugated Polymer Nanoparticles For Single Molecule Detection, Yueli Zheng

All Dissertations

Single molecule tracking using fluorescent dye or nanoparticle labels has emerged as a useful technique for probing biomolecular processes. Considerable interest arises in the development of nanoparticle labels with brighter fluorescence in order to improve the spatial and temporal resolution of single molecule detection and to facilitate the application of single molecule detection methods to a wider range of intracellular processes. The McNeill laboratory recently reported that conjugated polymer nanoparticles exhibit fluorescence cross-sections roughly 10-100 times higher than other luminescent nanoparticles of similar size, excellent photostability (2.2×108 photons emitted per nanoparticle prior to photobleaching), and saturated emission rates roughly 100 …

Fractal Jackson Networks, Mahmoud Rezaei

All Dissertations

In this dissertation, Gaussian random measures that arise as limits of Jackson networks. The support of the random measure is a fractal having Hausdorff dimension delta . The variance measure is the Hausdorff measure also of dimension delta.

The Design & Implementation Of An Abstract Semantic Graph For Statement-Level Dynamic Analysis Of C++ Applications, Edward Duffy

All Dissertations

In this thesis, we describe our system, Hylian, for statement-level analysis,
both static and dynamic, of a C++ application. We begin by extending the
GNU gcc parser to generate parse trees in XML format for each of the
compilation units in a C++ application. We then provide verification that the
generated parse trees are structurally equivalent to the code in the
original C++
application. We use the generated parse trees, together with an augmented
version of the gcc test suite, to recover a grammar for the C++ dialect that
we parse. We use the recovered grammar to generate a schema …

Electrolyte Incorporation Into Composite Electrodes For Proton-Exchange Membrane Fuel Cells And Lithium-Ion Batteries, Jung Oh

All Dissertations

This dissertation describes research on the preparation and characterization of composite electrodes for use in proton-exchange membrane (PEM) fuel cells and lithium ion batteries. The general focus of the research was on high-surface-area carbon supports for platinum catalysts in fuel cells, and integration of electrolytes, particularly fluoropolymer electrolytes, into composite electrodes both batteries and fuel cells. Results are described for work in the following three specific topical areas.
1. Carbon nanofibers for use as platinum (Pt) catalyst supports in fuel cells were prepared by carbonization of electrospun acrylic fibers. The resulting carbon nanofibers were found to contain mainly micropores. Following …

Time-Interval Analysis For Radiation Monitoring, Peng Luo

All Dissertations

On-line radiation monitoring is essential to the U.S. Department of Energy (DOE) Environmental Management Science Program for assessing the impact of contaminated media at DOE sites. The goal of on-line radiation monitoring is to quickly detect small or abrupt changes in activity levels in the presence of a significant ambient background. The focus of this research is on developing effective statistical algorithms to meet the goal of on-line monitoring based on time-interval (time-difference between two consecutive radiation pulses) data. Compared to the more commonly used count data which are registered in a fixed count time, time-interval data possess the potential …

Front Matter

The Synapse: Intercollegiate science magazine

No abstract provided.

Alohamora! Unlocking Magic With The Wonders Of Science, Anna Dardick

The Synapse: Intercollegiate science magazine

No abstract provided.

In Search Of Shell Space: A Look At A Unique Sea Turtle Nesting Behavior, Mia Dawson

The Synapse: Intercollegiate science magazine

No abstract provided.

So That They May Model, Isaac H. Mcceery

The Synapse: Intercollegiate science magazine

No abstract provided.

To The Brink Of Understanding, Isaac H. Mcceery

The Synapse: Intercollegiate science magazine

No abstract provided.

Artificial Intelligence In Digital Music: Musicians Using Techology To Streamline The Creative Process, Sam Fisher

The Synapse: Intercollegiate science magazine

No abstract provided.

Medicine Through The Ages: An Incision Into Surgery's Beginnings, Anna Dardick

The Synapse: Intercollegiate science magazine

No abstract provided.

Kinship Between The Kingdoms: Horizontal Gene Transfer, Darrin Schultz, Ben Garfinkel

The Synapse: Intercollegiate science magazine

No abstract provided.

This Is Your Brain On Acetylcholine, Ksenia Vlasov

The Synapse: Intercollegiate science magazine

No abstract provided.

The Short-Term Effects Of Cortisol

The Synapse: Intercollegiate science magazine

No abstract provided.

Mike Got A Bigger Bike: Mike Rauscher On Nuclear Space Travel, Quinton Steele

The Synapse: Intercollegiate science magazine

No abstract provided.

Jay Meijia On Bipolar Disorder, Hillary Mulan

The Synapse: Intercollegiate science magazine

No abstract provided.

Synthesis And Biosynthesis Of Polyketide Natural Products, Atahualpa Pinto

Chemistry - Dissertations

Traditionally separate disciplines of a large and broad chemical spectrum, synthetic organic chemistry and biochemistry have found in the last two decades a fertile common ground in the area pertaining to the biosynthesis of natural products. Both disciplines remain indispensable in providing unique solutions on numerous questions populating the field. Our contributions to this interdisciplinary pursuit have been confined to the biosynthesis of polyketides, a therapeutically and structurally diverse class of natural products, where we employed both synthetic chemistry and biochemical techniques to validate complex metabolic processes. One such example pertained to the uncertainty surrounding the regiochemistry of dehydration and …

Characterization Of Enhanced Interferometric Gravitational Wave Detectors And Studies Of Numeric Simulations For Compact-Binary Coalescences, Larne Pekowsky

Physics - Dissertations

Gravitational waves are a consequence of the general theory of relativity. Direct detection of such waves will provide a wealth of information about physics, astronomy, and cosmology. A worldwide effort is currently underway to make the first direct detection of gravitational waves. The global network of detectors includes the Laser Interferometer Gravitational-wave Observatory (LIGO), which recently completed its sixth science run.

A particularly promising source of gravitational waves is a binary system consisting of two neutron stars and/or black holes. As the objects orbit each other they emit gravitational radiation, lose energy, and spiral inwards. This produces a characteristic ``chirp'' …

Searching For Gravitational Waves From Compact Binary Coalescence Using Ligo And Virgo Data, Collin Capano

Physics - Dissertations

This thesis describes current efforts to search for gravitational waves from compact binary coalescences (CBCs) by the LIGO Scientific Collaboration (LSC) and the Virgo Collaboration. We briefly review the physics of gravitational-wave emission and detection, describing how gravitational waves are emitted from "inspiraling" compact stellar mass objects and how the LSC and Virgo try to detect them using interferometers. Next we review the data-analysis principles used to search for potential signals in the detectors' noise. These principles are employed by ``ihope," which is the data-analysis pipeline used to search for CBCs. We describe each step in this pipeline and discuss …