Physical Sciences and Mathematics Commons^™

Performance Impact Of Different Lower-Limb Setup Positions In The Backstroke Swimming Start, Gordon E. Barkwell

Electronic Thesis and Dissertation Repository

The performance impact of different knee extension angles in the setup position for a backstroke start was evaluated using an instrumented starting surface. Ten backstroke swimmers completed maximum-effort starts in each of two setup positions: one with the knees flexed, and one with the knees extended. The start handles and touchpad were instrumented with tri-axial force plates. Activity of major hip and knee extensors was measured using surface electromyography. Body position was recorded throughout the start using two high-speed cameras. There was no difference in time to 10 m between the two conditions, indicating there is likely no advantage in …

High Performance Sparse Multivariate Polynomials: Fundamental Data Structures And Algorithms, Alex Brandt

Electronic Thesis and Dissertation Repository

Polynomials may be represented sparsely in an effort to conserve memory usage and provide a succinct and natural representation. Moreover, polynomials which are themselves sparse – have very few non-zero terms – will have wasted memory and computation time if represented, and operated on, densely. This waste is exacerbated as the number of variables increases. We provide practical implementations of sparse multivariate data structures focused on data locality and cache complexity. We look to develop high-performance algorithms and implementations of fundamental polynomial operations, using these sparse data structures, such as arithmetic (addition, subtraction, multiplication, and division) and interpolation. We revisit …

When Does The Bombieri–Vinogradov Theorem Hold For A Given Multiplicative Function?, Andrew Granville, Xuancheng Shao

Mathematics Faculty Publications

Let f and g be 1-bounded multiplicative functions for which f ✻ g = 1_.=1. The Bombieri–Vinogradov theorem holds for both f and g if and only if the Siegel–Walfisz criterion holds for both f and g, and the Bombieri–Vinogradov theorem holds for f restricted to the primes.

Statistical Mechanics Of Thermalized Ribbons And Sheets, Sourav Sanjukta Bhabesh

Dissertations - ALL

In this dissertation, we study the thermal behavior of two-dimensional sheets and ribbons. We study the effects of thermal fluctuations on the crumpling transition of elastic sheets. Existing two-dimensional sheets have a crumpling temperature which is very high and the crumpling transition has not been observed experimentally. We propose a mechanism using which one can tune this crumpling transition by changing the shape and geometry of >the sheet. We perform extensive molecular dynamics simulations by perforating the sheet with a dense array of holes and find that the critical temperature is a function of the removed area. Lastly, we look …

Redefining The Scope Of Prenylation: Discovery Of “Forbidden” Substrate Recognition And Development Of Methods Utilizing Prenylated Proteins, Melanie Jane Blanden

Dissertations - ALL

Post-translational modifications play a central role in controlling biological function and cell behavior through changes in protein structure, activity, and localization. Prenylation is one such modification wherein a 15- or 20-carbon isoprenoid group is attached to a cysteine residue near the C-terminus of a substrate protein by one of three enzymes: protein farnesyltransferase (FTase), protein geranylgeranyltransferase type I (GGTase-I) or protein geranylgeranyltransferase type II (GGTase-II, also known as Rab GGTase). These covalent modifications can aid in protein association with cellular membranes, with this localization necessary for function of many prenylated proteins. FTase and GGTase-I have been proposed to recognize a …

T16s, R2e, Blm Plat_321103_1 - Apr. 10, 1895 Survey

Township and Range Surveys - BLM

A Apr. 10, 1895, survey or plat reflecting the Township, Range and Sections of T16S, R2E, located in Monterey County, California, USA

Forensic Toxicological Screening And Confirmation Of 800+ Novel Psychoactive Substances By Lc-Qtof-Ms And 2d-Lc Analysis, Melanie N. Eckberg

FIU Electronic Theses and Dissertations

Novel psychoactive substances (NPS) represent a great challenge to toxicologists due to the ability of illicit drug manufacturers to alter NPS chemical structures quickly and with ease to circumvent legislation regulating their use. Each time a new structure is introduced, there is a possibility that it has not been previously recorded in law enforcement or scientific databases. Many toxicology laboratories use targeted analytical methods that rely on libraries of known compounds to identify drugs in samples. However, these libraries do not include large numbers of NPS which could result in non-identification or detection.

High-resolution mass spectrometry (HRMS) has been suggested …

Design And Synthesis Of Stainless-Steel Nanoparticles: Oxidation Behavior And Morphological Evolution, Laxmikant Pathade

Dissertations - ALL

The objective of my graduate research is to understand the oxidation in heterostructured transition metal-based core/alloy nanostructures and to design protocol towards the synthesis of oxidation resistant stainless-steel nanoparticles. To this effect, I employed bottom-up wet chemistry approach to synthesize multi-shell Fe/CrxNi1-x NPs, bimetallic FexCr1-x alloy NPs, and Fe/Ni core/shell NPs. I performed the morphological analysis of these NPs via transmission electron microscopes (TEM/HRTEM), structural characterization via X-ray diffraction (XRD), surface analysis via X-ray photoelectron spectroscopy (XPS), thermal property analysis via thermogravimetric analysis (TGA), organic ligand characterization using infrared spectroscopy (FTIR), and absorption spectra using UV-visible spectroscopy (UV-Vis). In chapter …

T16s, R1e, Blm Plat_315544_1 - Oct. 5, 1872 Survey

Township and Range Surveys - BLM

A Oct. 5, 1872, survey or plat reflecting the Township, Range and Sections of T16S, R1E, located in Monterey County, California, USA

Multi-Stimuli-Responsive Self-Immolative Polymer Assemblies, Rebecca E. Yardley, Elizabeth R. Gillies

Chemistry Publications

Self-immolative polymers (SIPs) undergo depolymerization in response to the cleavage of stimuli-responsive end-caps from their termini. Some classes of SIPs, including polycarbamates, have depolymerization rates that depend on environmental factors such as solvent and pH. In previous work, hydrophobic SIPs have been incorporated into amphiphilic block copolymers and used to prepare nanoassemblies. However, stimuli-responsive hydrophilic blocks have not previously been incorporated. In the current work, we synthesized amphiphilic copolymers composed of a hydrophobic polycarbamate SIP block and a hydrophilic poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) block connected by a UV light-responsive linker end-cap. It was hypothesized that after assembly of the block copolymers …

Motility-Induced Phases: Out-Of-Equilibrium Droplets, Surfaces, And Survival, Adam Edward Patch

Dissertations - ALL

Active matter represents a unique kind of out-of-equilibrium matter that is endowed with motility, the ability of each individual unit to move according to its own self-propulsion force. Objects of study in active matter include entities like birds and cells, which become particularly interesting at scales larger than the individuals, where we find emergent collective behavior like flocking and morphogenetic self-organization, respectively. One can study both microscopic and macroscopic behaviors of these particles using theory, simulation, and experiment, but largescale simulations are critically important to understanding some of the underlying statistical mechanical properties of active matter.

Motility-induced phase separation (MIPS) …

Ghrelin Processing And Maturation: Developing A Molecular-Level Framework For Hormone Activation And Biological Function, Elizabeth Rose Cleverdon

Dissertations - ALL

Ghrelin is a 28 amino acid hormone involved in appetite stimulation, maintenance of energy balance, and a range of other neuroendocrine functions. Over the course of its expression and maturation, proghrelin (the prohormone of ghrelin) undergoes a unique posttranslational modification whereby a serine side chain is esterified with octanoic acid. Proghrelin then undergoes subsequent proteolysis to yield ghrelin. This octanoylation modification has been demonstrated to be required for ghrelin to activate its cognate receptor. Since acylated ghrelin has been linked with a variety of disease states, ghrelin signaling is a prime target for inhibition and inhibitor development. Biochemical and structural …

Dispersive Transport And Drift Mobilities In Methylammonium Lead Iodide Perovskites, Brian Maynard

Dissertations - ALL

Perovskite solar cells (PSCs) have impacted the photovoltaic industry over the past decade with unprecedented boosts in photo-conversion efficiencies. Perovskites’ dramatic rise has been due to borrowed ideas and research from other types of solar cell geometries. The initial surge in perovskite research started in 2009 with the discovery of unusually long photocharge carrier lifetimes and ambipolar diffusion. These discoveries changed the geometry of the solar cell from a dye-sensitized structure to n-i-p. The work done in this dissertation focuses on thin film methyl-ammonium lead iodide perovskites in n-i-p structures made by the National Renewable Energy Laboratory and Iowa State …

Post-Orogenic Thermal History And Exhumation Of The Northern Appalachian Basin: Low-Temperature Thermochronologic Constraints, Chilisa Marie Shorten

Dissertations - ALL

Since the early development of the fission-track dating method by Price, Walker and Fleischer in the 1960’s and 1970’s, the method has evolved into a robust tool for constraining thermal histories and determining exhumation rates within the upper continental crust. Low-temperature thermochronology, notably apatite fission-track thermochronology because it has a kinetic parameter (i.e. track lengths), is commonly used to constrain the tectonic history of orogenic belts and the thermal history within sedimentary basins for hydrocarbon resource assessment. Collisional tectonics in the Paleozoic which formed of the Appalachian Orogen and the foreland basin has been a subject of considerable study. The …

Fabrication And Characterization Of Superconducting Metamaterial Resonators, Haozhi Wang

Dissertations - ALL

Superconducting circuits operated at low temperatures have led to rapid advances in quantum information processing as well as quantum optics in the microwave regime. Engineered quantum systems with a dense spectrum of modes coupled to artificial atoms, or qubits, formed from superconducting circuits offer an opportunity to explore large-scale entanglement or perform quantum simulations of many-body phenomena. Recent research efforts into artificial metamaterials have yielded microwave and optical systems with numerous counterintuitive properties, including left-handed transmission, where the group velocity and phase velocity for a wave point in opposite directions. Metamaterial resonators implemented with superconducting thin-film circuits provide a route …

Assessing Dissolved Methane And Halogen Patterns In Groundwater Of New York State, Shannon Garvin

Theses - ALL

Due to the ban on hydraulic fracturing for natural gas in New York State (NYS), it serves as an ideal location to study the natural processes that control the migration of dissolved methane and high salinity fluids found at depth. The hydrogeologic setting of NYS is analogous to that of Northern Pennsylvania where unconventional exploration has not been restricted. Halogens geochemically behave conservatively and can be found in unique proportions. Therefore, they serve as useful tracers for the natural movement of groundwater. The focus of our study is to: 1) establish a more cohesive baseline for groundwater quality data for …

Seasonally Resolved Δ18o From Pennsylvanian Mollusk Aragonite, Marie Yerill Jimenez

Theses - ALL

Use of the δ18O thermometer in deep time investigations is complicated by uncertainty in the oxygen isotopic composition of seawater and an increasing potential for diagenetic alteration with age. These concerns are particularly important when considering that δ18O values from Paleozoic marine carbonates are generally low and show a depletion trend with increasing age. Competing explanations for this trend include increasing alteration with age, evolution of seawater δ18O through time, and increasing ocean temperatures with age. Demonstrating the preservation of original mineralogy, thus eliminating diagenesis as a factor, is a primary hurdle in deconvolving potential causes. Here, we report data …

Non-Uniform Glacial Erosion In New York State Viewed Through The Lens Of Cosmogenic Nuclide Concentrations And Forward Modeling, Jennifer Nita Nair

Theses - ALL

Throughout the Pleistocene the northern hemisphere was subject to alternating ice-free and ice accumulation periods. Today’s glacial landscapes, composed of a mix of erosive and depositional geomorphological features, reflect the integrated impacts of successive Pleistocene glaciations. In North America such impacts include the formation of the Great Lakes, the reorganization of river networks and the deposition of till sheets, erratic boulders, and moraines. Nearly all of New York State was covered by ice; however, the impact of the successive glaciations on the landscape varies throughout the state. An examination of the regional topography reveals relatively undissected, streamlined landforms of the …

Rheology And Collective Behavior In Living Tissue, Michael David Czajkowski

Dissertations - ALL

Recent experiments and simulations have indicated that confluent epithelial layers, where there are no gaps or overlaps between the cells, can transition from a soft fluid-like state to a solid-like state, with dynamics that share many features with glass transitions. While a coherent picture has begun to form connecting the microscopic mechanisms that drive this transition with macroscopic observables, much less is known of its consequences in biological processes. Do tissues tune themselves to a fluid state in order to promote collective motion? Has evolution made use of the ability of tissues to tune themselves between fluid and solid states …

Evaluation Of Thermal Effects And Lattice Vibrations In Molecular Crystals, Adam Joseph Zaczek

Dissertations - ALL

The effect of temperature plays a large role in the behavior of many physical systems. While it is certainly the case that many effects of temperature can be observed macroscopically, they are often of molecular origin, and determining why these effects occur can provide insight into the nature of chemical systems as a whole. A large portion of this work is dedicated to analyzing polymorphic forms and small organic molecules with interesting thermal effects. Low-frequency spectroscopy is a very useful tool in the investigation of polymorphs, providing a method of probing a sample to investigate the possible motions and characteristics …

T16s, R1e, Blm Plat_315546_1 - Mar. 24, 1890 Survey

Township and Range Surveys - BLM

A Mar. 24, 1890, survey or plat reflecting the Township, Range and Sections of T16S, R1E, located in Monterey County, California, USA

T16s, R1e, Blm Plat_315548_1 - Apr. 10, 1895 Survey

Township and Range Surveys - BLM

A Apr. 10, 1895, survey or plat reflecting the Township, Range and Sections of T16S, R1E, located in Monterey County, California, USA

T16s, R1w, Blm Plat_380679_1 - Jan. 14, 1873 Survey

Township and Range Surveys - BLM

A Jan. 14, 1873, survey or plat reflecting the Township, Range and Sections of T16S, R1W, located in Monterey County, California, USA

T16s, R1w, Blm Plat_380681_1 - Mar. 24, 1890 Survey

Township and Range Surveys - BLM

A Mar. 24, 1890, survey or plat reflecting the Township, Range and Sections of T16S, R1W, located in Monterey County, California, USA

T16s, R2e, Blm Plat_321101_1 - Nov. 17, 1875 Survey

Township and Range Surveys - BLM

A Nov. 17, 1875, survey or plat reflecting the Township, Range and Sections of T16S, R2E, located in Monterey County, California, USA

T16s, R3e, Blm Plat_321229_1 - Nov. 22, 1875 Survey

Township and Range Surveys - BLM

A Nov. 22, 1875, survey or plat reflecting the Township, Range and Sections of T16S, R3E, located in Monterey County, California, USA

T16s, R4e, Blm Plat_320715_1 - Apr. 6, 1883 Survey

Township and Range Surveys - BLM

A Apr. 6, 1883, survey or plat reflecting the Township, Range and Sections of T16S, R4E, located in Monterey County, California, USA

T16s, R5e, Blm Plat_320834_1 - Nov. 21, 1868 Survey

Township and Range Surveys - BLM

A Nov. 21, 1868, survey or plat reflecting the Township, Range and Sections of T16S, R5E, located in Monterey County, California, USA

T16s, R6e, Blm Plat_319844_1 - Oct. 10, 1882 Survey

Township and Range Surveys - BLM

A Oct. 10, 1882, survey or plat reflecting the Township, Range and Sections of T16S, R6E, located in Monterey County, California, USA

T15s, R2&3e, T14s, R1&2e, Blm Plat_315537_1 - Apr. 17, 1961, Portion Of Fort Ord Military Reservation Boundary Survey

Township and Range Surveys - BLM

A Apr. 17, 1961, survey or plat reflecting the Township, Range and Sections of T15S, R2&3E, T14S, R1&2E, located in Monterey County, California, USA