Physical Sciences and Mathematics Commons^™

Evaluation Of A Wide Rim Phosphorylated Calix[4]Arene's Properties As A Sensory Molecule In An Er(Iii)-Pvc Membrane Sensor, Abbas Ali Zamani, Massoumeh Parinejad, Fataneh Jamali, Mohammad Reza Yaftian, Dominique Matt

Turkish Journal of Chemistry

This study concerns the evaluation of ionophoric properties of a functionalized calix[4]arene, named 5,17-bis(diphenylphosphinoyl)- 25,26,27,28-tetrapropoxycalix[4]arene (Calix), by its application as a sensing material in an erbium(III)-PVC membrane potentiometric sensor. A membrane formed by 30% PVC, 65% dioctyl phthalate (DOP) as plasticizing solvent mediator, 2% sodium tetraphenyl borate (NaTPB) as ion excluder, and 3% of Calix as ionophore shows the best performance of the sensor. The prepared sensor presents a nearly Nernstian response (a slope of 20.0 \pm 0.5 mV/decade) over a concentration range of 1 \times 10^{-7}--1 \times 10^{-3} M of erbium ions, with a limit of detection of 3.8 …

Zeeman Effect Studies Of Magnetic Fields In The Milky Way, Kristen Lynn Thompson

Theses and Dissertations--Physics and Astronomy

The interstellar medium (ISM) of our Galaxy, and of others, is pervaded by ultra low-density gas and dust, as well as magnetic fields. Embedded magnetic fields have been known to play an important role in the structure and dynamics of the ISM. However, the ability to accurately quantify these fields has plagued astronomers for many decades. Unfortunately, the experimental techniques for measuring the strength and direction of magnetic fields are few, and they are observationally challenging. The only direct method of measuring the magnetic field is through the Zeeman effect.

The goal of this dissertation is to expand upon the …

Obscuration In Active Galactic Nuclei, Robert Nikutta

Theses and Dissertations--Physics and Astronomy

All classes of Active Galactic Nuclei (AGN) are fundamentally powered by accretion of gas onto a supermassive black hole. The process converts the potential energy of the infalling matter to X-ray and ultraviolet (UV) radiation, releasing up to several 10¹² solar luminosities.

Observations show that the accreting "central engines" in AGN are surrounded by dusty matter. The dust occupies a "torus" around the AGN which is comprised of discrete clumps. If the AGN radiation is propagating through the torus on its way to an observer, it will be heavily re-processed by the dust, i.e. converted from UV to infrared …

Ultrasound-Assisted Aza-Michael Reaction In Water: A Green Procedure, Debasish Bandyopadhyay, Sanghamitra Mukherjee, Luis C. Turrubiartes, Bimal K. Banik

Chemistry Faculty Publications and Presentations

The conjugate addition of amines to conjugated alkenes (commonly known as aza-Michael reaction) constitutes a key step for the synthesis of various complex natural products, antibiotics, α-amino alcohols and chiral auxiliaries. Ultrasound-induced addition of several amines to α, β-unsaturated ketones, esters and nitriles has been carried out very efficiently in water as well as under solvent-free conditions. No catalysts or solid supports have been used in this method. Remarkable enhancement of reaction rate has been observed in water under ultrasound-induced method. This environmentally benign procedure has provided clean formation of the products with better selectivity.

Equations Of State For Amorphous And Crystalline Nickel By Means Of Molecular Dynamics Method, Soner Özgen, Levent Sonğur, İzzet Kara

Turkish Journal of Physics

There are few theoretical studies on the equation of state (EOS) for amorphous materials while much work has been carried out for crystalline systems. In this study, the EOSs for both crystal- and amorphous-structured nickel are obtained by using an anisotropic molecular dynamics method based on the Voter-Chen formalism of embedded atom method. In order to achieve the EOSs, polynomial curve fitting method has been applied to the data obtained from molecular dynamics simulations carried assuming isothermal and isobaric conditions. Isothermal bulk modulus and their pressure derivatives for both amorphous and crystal structures have also been calculated. The results are …

Archaean Zircon U-Pb Age Paradox In Juvenile Neoproterozoic Granitoids, Central North Sudan, Saharan Metacraton, Shang Cosmas, Morteani Giulio, Muharrem Satir

Turkish Journal of Earth Sciences

It has long been shown that central North Sudan with its heterogeneous isotopic composition, unlike neighbouring Archaean cratons and the Neoproterozoic Arabian-Nubian Shield, is part of the Saharan metacratonic crust that was remobilized in the Neoproterozoic. In this paper, we report an Archaean zircon U-Pb age in the Saharan Metacraton that paradoxically does not indicate the presence of an Archaean crust. The second paradox concerns geochemical data that show Archaean tonalite-trondhjemite-granodiorite (TTG) features and also post-Archaean granitoid features, yet the rocks are Neoproterozoic. The granitoids studied are from north of Delgo in the Halfa terrane. They are calc-alkaline and meta- …

Palaeoflora And Climate Of Lignite-Bearing Lower−Middle Miocene Sediments In The Seyitömer And Tunçbilek Sub-Basins, Kütahya Province, Northwest Turkey, Mehmet Serkan Akki̇raz, Funda Akgün, Torsten Utescher, Volker Wilde, Angela Anneliese Bruch, Volker Mosbrugger, Sari̇ye Duygu Üçbaş

Turkish Journal of Earth Sciences

Lower-Middle Miocene successions from Kütahya province (Seyitömer and Tunçbilek sub-basins) were analyzed to reconstruct the palaeoclimate and vegetation of the period. A rich coniferous forest formed the dominant components among sporomorphs and consisted mainly of undeterminable Pinaceae, Pinus haploxylon type, Pinus diploxylon type, Picea, Cedrus, Cathaya, Keteleeria and Podocarpus. Pollen data also indicate the presence of some fern taxa (Osmunda, Polypodiaceae, Schizeaceae) Selaginella and Lycopodium. Cupressaceae frequently occur in all samples from both sub-basins, and form part of the mixed forest assemblage. Two woody plants Castanea-Castanopsis and evergreen Quercus predominate in the assemblages as well. The reconstruction of palaeoclimate is …

The Palu-Uluova Strike-Slip Basin In The East Anatolian Fault System, Turkey: Its Transition From The Palaeotectonic To Neotectonic Stage, Serap Çolak, Ercan Aksoy, Ali̇ Koçyi̇ği̇t, Murat İnceöz

Turkish Journal of Earth Sciences

The East Anatolian fault system (EAFS) is the 80-km-wide, 700-km-long, NE-trending sinistral strike-slip fault system forming a seismically very active intracontinental transfom fault boundary. It is located between Karlıova County in the northeast and Karataş-Samandağ counties in the southwest, and forms the southeastern boundary of the Anatolian platelet. The Palu-Uluova basin is one of several strike-slip basins located along the EAFS. It is surrounded by several push-ups such as the Karaömerdağı, Mastardağı and Askerdağı push-ups caused by the complexities peculiar to strike-slip faulting. The Palu-Uluova basin consists of three sub-sections: two are NE-trending strike-slip sub-basins, the Uluova and the Palu-Kumyazı …

Testing Alternative Tectono-Stratigraphic Interpretations Of The Late Palaeozoic−Early Mesozoic Karakaya Complex In Nw Turkey: Support For An Accretionary Origin Related To Northward Subduction Of Palaeotethys, Alastair Robertson, Ti̇mur Ustaömer

Turkish Journal of Earth Sciences

Lower Carboniferous-Upper Triassic rocks of the Karakaya Complex exposed E-W across Turkey are critical to reconstructions of Palaeotethys in the Eastern Mediterranean region. Despite decades of research, the origin and emplacement of the Karakaya Complex remains controversial because it is mapped either as an overall stratigraphic succession of sedimentary olistostromes or as a stack of thrust sheets and mélange. Tectonic models include a continental rift, a back-arc rift, a marginal oceanic basin, and an accretionary prism formed by subduction of a wide ocean. Subduction is seen as either northwards or southwards. To test the alternatives, the various litho-tectonic units and …

Geology Of The Eau Claire Formation And Conasauga Group In Part Of Kentucky And Analysis Of Their Suitability As Caprocks For Deeper Co2 Sequestration, Ralph E. Bandy Iii

Theses and Dissertations--Earth and Environmental Sciences

Carbon sequestration, or carbon capture and storage (CCS), is the process of capturing anthropogenically generated CO₂, transporting the CO₂ to an injection site, and then injecting the CO₂ into suitable reservoirs for long-term storage, or sequestration. Integral to the successful sequestration of CO₂ is an understanding of the confining intervals (seals) above potential reservoirs. The purpose of this thesis research was to perform a detailed geological study of the Eau Claire Formation and equivalent parts of the Conasauga Group in part of the Ohio River Valley region in order to better evaluate its suitability as …

Nuclear Structure Of Xe-Pt Nuclei In The Framework Of Arm And Odd-Even Staggering, Harish Mohan Mittal, Vidya Devi

Turkish Journal of Physics

The asymmetric rotor model (ARM) of collective rotation is used to search for the correlation between the rotational energy with the asymmetric parameter \gamma_0 for Xe-Pt nuclei. The correspondence of the ratio ROTE/E(2_1^+) vs. R_{4/2}(=E(4_1^+)/E(2_1^+)) and \gamma_0 is used to distinguish between the axially symmetric and triaxial nuclei. The correlation between deformation parameter \beta and \gamma_0 is studied to understand the structure of the nuclei. The \gamma-band energy staggering in low-spin, low-energy spectra of even-even ^{122-124}Xe and ^{124-128}Ba nuclei is also discussed. We have compared our results with experimental data and other theoretical models.

Bianchi-V Cosmological Models With Viscous Fluid And Constant Deceleration Parameter In General Relativity, Sharad Kandalkar, Pramod Khade, Mohini Gaikwad

Turkish Journal of Physics

In this paper we discuss the variation law for Hubble's parameter, average scale factor in spatially homogenous anisotropic Bianchi Type V space-time that yields a constant value deceleration parameter. Using the law of variation for Hubble's parameter, exact solutions of Einstein's field equations are obtained for Bianchi-V space time filled with viscous fluid in two different cases where the universe exhibits power law and exponential expansion. We investigate a number of solutions with constant and time varying cosmological constant together with variable and constant bulk viscosity. We find that the constant value of deceleration parameter is reasonable for the present …

Morphological And Optical Properties Of Vacuum Evaporated Zno Thin Films, Farzana Chowdhury, S. M. Firoz Hasan, M. Sahabul Alam

Turkish Journal of Physics

ZnO thin films were deposited onto chemically and ultrasonically cleaned glass substrates by thermal evaporation in vacuum (\sim 10^{-6} mbar). The thickness of the films was measured by frequency shift of quartz crystal. The optical properties of the films have been ascertained by UV-VIS-NIR spectrophotometry in the photon wavelength range of 300--2500 nm. The effect of substrate temperature on the optical properties of the films has been investigated, where all film thickness was kept fixed at 100 \pm 10 nm. The optical transmittance spectra reveal a maximum transmittance of 88% at room temperature around photon wavelength of 2350 nm. Band …

Restricting Supervised Learning: Feature Selection And Feature Space Partition, Xiaofei Nan

Electronic Theses and Dissertations

Many supervised learning problems are considered difficult to solve either because of the redundant features or because of the structural complexity of the generative function. Redundant features increase the learning noise and therefore decrease the prediction performance. Additionally, a number of problems in various applications such as bioinformatics or image processing, whose data are sampled in a high dimensional space, suffer the curse of dimensionality, and there are not enough observations to obtain good estimates. Therefore, it is necessary to reduce such features under consideration. Another issue of supervised learning is caused by the complexity of an unknown generative model. …

Standoff Laser Interferometric Photoacoustic Spectroscopy For The Detection Of Explosives, Logan Marcus

Electronic Theses and Dissertations

There will unfortunately always be a pressing need to detect and identify explosive materials. Performing detection at a standoff distance is much safer and this is the impetus for this work. Photoacoustic spectroscopy is well suited to the task of explosive detection at a standoff distance. A detailed theory of the standoff measurement of the physical response of a system to photoacoustic excitation with an interferometric sensor has been constructed and tested. The use of this methodology to measure the standoff photoacoustic spectrum of TNT with an interferometric sensor has clearly been demonstrated. This methodology and the tested theory can …

Stochastic Modeling Of Network-Centric Epidemiological Processes, Divine Wanduku

USF Tampa Graduate Theses and Dissertations

The technological changes and educational expansion have created the heterogeneity in the human species. Clearly, this heterogeneity generates a structure in the population

dynamics, namely: citizen, permanent resident, visitor, and etc. Furthermore, as the heterogeneity in the population increases, the human mobility between meta-populations patches

also increases. Depending on spatial scales, a meta-population patch can be decomposed into sub-patches, for examples: homes, neighborhoods, towns, etc. The dynamics of human

mobility in a heterogeneous and scaled structured population is still its infancy level. We develop and investigate (1) an algorithmic two scale human mobility dynamic model for a meta-population. Moreover,the two …

Stable Isotope Analysis Of Busycon Sinistrum To Determine Fort Walton-Period Seasonality At St. Joseph Bay, Northwest Florida, Ryan Michael Harke

USF Tampa Graduate Theses and Dissertations

ABSTRACT

Recent archaeological investigations indicate that coastal Fort Walton cultures in the St. Joseph Bay region of northwest Florida emphasized marine and estuarine foraging. These late prehistoric (A.D. 1000-1500) peoples collected fish, shellfish, and other aquatic resources. At the Richardson's Hammock site (8Gu10), radiocarbon-dated to about A.D. 1300, as at dozens of other shell middens around this salty bay, large gastropods were a major subsistence component. This adaptation is in sharp contrast with that of contemporaneous inland Fort Walton societies, who relied on maize agriculture. It is unknown whether coastal groups represent separate hunter-gatherer-fisher populations or seasonal migrations by inland …

Determining The Feasibility Of Universal Access To Bus Transportation For Illinois Wesleyan University Students, Liz Kuehn '13

Outstanding Senior Seminar Papers

In a car-based society, transportation has both environmental and economic implications. However, public transportation, and programs like Universal Access that promote public transportation by providing ‘fare free’ access to specific groups in the community, can offer low cost, sustainable alternatives to car-based transportation. The basic concept behind Universal Access is that a community group contracts with the local public transit system to provide unlimited access to public transportation for individuals within the group at a negotiated cost to the group (Toor et. al 2004). The purpose of this study is to determine the feasibility of creating a Universal Access program …

Testing Irreducibility Of Trinomials Over Gf(2), Steven Hayman

Honors Projects

The focus of this paper is testing the irreducibility of polynomials over finite fields. In particular there is an emphasis on testing trinomials over the finite field GF(2). We also prove a the probability of a trinomial satisfying Swan's theorem is asymptotically 5/8 as n goes to infinity.

A Note On Horner's Method, Tian-Xiao He, P. J.-S. Shiue

Scholarship

Here we present an application of Horner's method in evaluating the sequence of Stirling numbers of the second kind. Based on the method, we also give an e_cient way to calculate the diference sequence and divided diference sequence of a polynomial, which can be applied in the Newton interpolation. Finally, we survey all of the results in Proposition 1.4.

Eulerian Polynomials And B-Splines, Tian-Xiao He

Scholarship

Here presented is the interrelationship between Eulerian polynomials, Eulerian fractions and Euler-Frobenius polynomials, Euler-Frobenius fractions, B-splines, respectively. The properties of Eulerian polynomials and Eulerian fractions and their applications in B-spline interpolation and evaluation of Riemann-zeta function values at odd integers are given. The relation between Eulerian numbers and B-spline values at knot points are also discussed.

A Discovery-Oriented Approach To Solid-Phase Peptide Synthesis, Brian Brennan, Matthew Bockman, Christopher Miedema

Scholarship

In this discovery-oriented laboratory experiment, students use solid-phase synthesis techniques to construct a dipeptide containing an unknown amino acid. Following synthesis and cleavage from the polymeric support, electrospray ionization-mass spectrometry is employed to identify the unknown amino acid that was used in the peptide coupling. This experiment, performed in two, 3-h laboratory periods, provides an opportunity for students to learn the technique of solid-phase peptide synthesis and to critically evaluate data that they generate in the laboratory. The experiment is suitable for second-semester organic chemistry students as they learn methods for the formation of amide bonds or upper-level biochemistry students …

Quantum-Dot Mode-Locked Lasers With Optical Injection, Tatiana Habruseva

Theses

In this thesis novel stabilised ultra-fast pulse sources for a range of practical applications have been developed.

Semiconductor mode-locked lasers have much promise as sources of short, low- jitter, high repetition rate pulses. Development of stabilised semiconductor sources is in a great demand for applications, such as optical telecommunications, frequency metrology, optical sampling and clock recovery. Arbitrary waveform generation, wavelength-division and orthogonal-frequency-division multiplexing techniques need wide stable frequency combs with low phase noise. A low level of pulse-to-pulse timing fluctuations is essential for clock recovery, optical sampling and optical time- division multiplexing. Therefore, this work dealing with the development of …

Iteration Digraphs, Hannah Roberts

Senior Independent Study Theses

No abstract provided.

Complexity Of Mitochondrial Genome Sequences, Brandon Toun

Undergraduate Journal of Mathematical Modeling: One + Two

The purpose of this project is to compare the complexities of different species' mitochondrial genome sequences. Using an implementation of Deflate compression algorithm from Java standard library, we were able to compress mitochondrial genomes of nine different species. The complexity of each sequence is estimated as a ratio of the original sequence length to the length of the compressed sequence. In addition, we show how a notion of topological entropy from symbolic dynamics can be used as another complexity measure of nucleotide sequences.

Overfishing Of The Common Snook, Allison Ashcroft

Undergraduate Journal of Mathematical Modeling: One + Two

The chief aim of this project is to determine if the populations of the common snook, Centropomus Undecimalis, in the Atlantic and Gulf coast are being affected by overfishing. This is established by evaluating the intrinsic rate of change for these populations and their carrying capacities. It turns out that the carrying capacity for the population of the Atlantic coast is approximately one million snook and its intrinsic rate is 0.00621, while the carrying capacity of the Gulf coast's population is 2.9 million snook and its intrinsic rate is 0.00165. The decline of both populations is most likely due …

Procedurally Generating Everything, Micah Caunter

Senior Independent Study Theses

This paper investigates using Perlin Noise in a three-dimensional environment. Perlin Noise has been previously used to simulate clouds, marble, wood, and other natural phenomena as well as to model virtual landscapes. The simulation created for the I.S. procedurally generates both static and animated textures and models virtual landscapes to create a virtual world. In order to keep up with the rapidly advancing graphics industry, the OpenGL API is utilized to generate the textures in real-time and to display the final product.

The Cumulative Impact Of Unemployment On Risks Of Acute Myocardial Infarction, Guangya Liu, Matthew E. Dupree, Linda K. George, Eric D. Peterson

Faculty Scholarship

Background: Employment instability is a major source of strain affecting an increasing number of adults in the United States. Little is known about the cumulative effect of multiple job losses and unemployment on the risks for acute myocardial infarction (AMI).

Methods: We investigated the associations between different dimensions of unemployment and the risks for AMI in US adults in a prospective cohort study of adults (N=13 451) aged 51 to 75 years in the Health and Retirement Study with biennial follow-up interviews from 1992 to 2010. Unadjusted rates of age-specific AMI were used to demonstrate observed differences by employment status, …

Technology Platform For Sampling Water With Electrolyte-Gated Organic Transistors Sensitised With Langmuiur-Deposited Calixarene Surface Layers., Delia Puzzovio, Abdullah Al Naim, Lee Hague, Mary Deasy, James P. Ward, Tim Richardson, Martin Grell

Articles

We demonstrate a technology platform that enables the development of new, surface-sensitised organic transistor sensors. We show that an organic semiconductor can still be gated by an electric double layer within the electrochemical window of water after the deposition of up to four Langmuir- Schäfer calixarene layers onto its surface. Since many calixarenes are known to selectively bind waterborne cations, this facilitates sensitising a conventional organic semiconductor with a physically deposited layer for specific cation recognition. When at least two Langmuir-Schäfer layers are deposited, these also block the electrochemical doping of the organic semiconductor, which otherwise competes with the field …

Tackling Tax Evasion: Transfer Price Manipulation, Extractive Natural Resources And A Strategy For The Southern African Customs Union, Patrick Grant Mclennan

Electronic Theses and Dissertations

An increase in the number of multinational enterprises (MNEs) has increased the attention on cross-border challenges, such as transfer price manipulation (TPM). TPM is a development issue - it undermines institutions as well as siphons money from government revenues that could be directed towards programs for human development. Pervasive corruption in the natural resource sector supports an environment where TPM can flourish. This paper develops a strategy for combating TPM within the countries of the Southern African Customs Union. It does this by 1) defining the terrain of illicit flows, both generally and specifically to the abuse of transfer pricing …