Physical Sciences and Mathematics Commons^™

Manuel Pérez-Quiñones: The Need For Diversity In Computer Science, Willa Kerkoff

The Synapse: Intercollegiate science magazine

No abstract provided.

Using Yeast To Solve The Mystery Of Amyloid Proteins, Joo Hyung Park

The Synapse: Intercollegiate science magazine

No abstract provided.

The Psychopathic Mind: The Signs, Symptoms, And Predictions Of A Brain Without Empathy, Kirsten Heuring

The Synapse: Intercollegiate science magazine

No abstract provided.

Addicted To Love: How Cocaine Hijacks Neural Circuits, James Cato

The Synapse: Intercollegiate science magazine

No abstract provided.

Coffee Through And Through: The Story Of The World's Most Popular Drink, El Mcaninch

The Synapse: Intercollegiate science magazine

No abstract provided.

Pipettes In Peril

The Synapse: Intercollegiate science magazine

No abstract provided.

Down In The Flood: The Pontchartrain Institute’S Continuing Efforts To Remediate Louisiana’S Marshes, Aaron Perles

The Synapse: Intercollegiate science magazine

No abstract provided.

Sifting Throught The Sediments Of Time: Using Thermonuclear Events To Measure Environmental Erosion Rates, Monica Dix

The Synapse: Intercollegiate science magazine

No abstract provided.

Ellie Tiley: A Year Of Research In Michael Moore's Laboratory, Cameron Moss

The Synapse: Intercollegiate science magazine

No abstract provided.

Feminism, Zika And Public Health: What The Zika Virus Teaches About The Necessity For Feminist Ideology In Public Health Policy, Jayla Johnson

The Synapse: Intercollegiate science magazine

No abstract provided.

Planet Hunters: The Search For Earthlike Worlds, Jacob Turner

The Synapse: Intercollegiate science magazine

No abstract provided.

Mann, Miller, And Edmunds: The Science Behind The Planets Of Interstellar, Jayla Johnson

The Synapse: Intercollegiate science magazine

No abstract provided.

Sleep Deprivation And The Body: How Catching Zs (Or Not) Effects Your Health, Rachael Branscomb

The Synapse: Intercollegiate science magazine

No abstract provided.

Genes, Tribes, And Morality: Can Natural Selection Explain The Oddities Of Human Behavior?, Aaron Perles

The Synapse: Intercollegiate science magazine

No abstract provided.

Did My Eighth Grade Girlfriend's Dad Cause My Psychosis? A Brain In Flames, Peter Durning

The Synapse: Intercollegiate science magazine

No abstract provided.

The Blue Plague: The Proliferation Of Cyanobacteria In Guatemala's Historic Lago Atitlan, Gaby Sarri-Tobar

The Synapse: Intercollegiate science magazine

No abstract provided.

The Psychology Of Mental Illness Stigma: Stereotypes And Solutions, Daphnis Bream

The Synapse: Intercollegiate science magazine

No abstract provided.

Crossword Corner, Rachel Dan

The Synapse: Intercollegiate science magazine

No abstract provided.

Reforming Mathematics: Why Are People Scared Of Math?, Oliver Meldrum

The Synapse: Intercollegiate science magazine

No abstract provided.

Magnetic Field Non-Uniformity Challenges In Neutron Electric Dipole Moment Experiments, Nima Nouri

Theses and Dissertations--Physics and Astronomy

A new neutron Electric Dipole Moment (nEDM) experiment was proposed to be commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source (SNS) of the Oak Ridge National Laboratory (ORNL). The underlying theme of this experiment (first conceived by Golub and Lamoreaux in 1994) is the search for new physics beyond the Standard Model of particle physics. The discovery of a non-zero nEDM would be of revolutionary importance to physics, with the discovery of such providing for evidence for new-beyond-the-Standard-Model physics required for a resolution to the unresolved puzzle of why the universe is dominated by matter, as …

Lattice Qcd Calculation Of The Momentum Fraction Carried By Quarks In The Nucleon, And The Roper Puzzle, Mingyang Sun

Theses and Dissertations--Physics and Astronomy

This thesis is concerned with the lattice QCD calculation of the momentum fraction carried by quarks in the nucleon. Particularly, the strange quark contribution, (x)_s, is calculated, as well as the ratio of the strange (x) to that of u/d in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions at small x. The disconnected insertion is known to be hard to calculate on the lattice. We adopt the overlap fermion action on several 2 + 1 flavor domain-wall fermion ensembles with a light sea quark mass which corresponds to pion …

Probing Physical Conditions In The Crab Nebula With Emission Line Analysis, Xiang Wang

Theses and Dissertations--Physics and Astronomy

We present a range of steady-state photoionization simulations, corresponding to different assumed shell geometries and compositions, of the unseen postulated rapidly expanding outer shell to the Crab Nebula. The properties of the shell are constrained by the mass that must lie within it, and by limits to the intensities of hydrogen recombination lines. In all cases the photoionization models predict very strong emission from high ionization lines that will not be emitted by the Crab’s filaments, alleviating problems with detecting these lines in the presence of light scattered from brighter parts of the Crab. The NIR [Ne VI] λ 7.652 …

Elastic Compton Scattering From Deuterium Near 100 Mev, Khayrullo Shoniyozov

Theses and Dissertations--Physics and Astronomy

Tagged photons from 81 to 116 MeV were used to measure elastic Compton scat- tering cross sections from deuterium and carbon targets at the MAX-lab facility in Lund. Scattered gamma rays were detected in three very large NaI(Tl) crystals with sufficient energy resolution to isolate deuterium elastic yields at scattering angles of 60°, 90°, 120° and 150°. Calculations indicate that back-angle Compton scattering on deuterium in this energy range is sensitive to the electric and magnetic polarizabilities of the nucleon. Results of this research were obtained with improved beam tagging system conditions compared to previous elastic Compton scattering experiments from …

A Systematic Study Of The Effect Of Spin-Orbit Interaction On Properties Of Tetravalent And Pentavalent Iridate Compounds, Jasminka Terzic

Theses and Dissertations--Physics and Astronomy

Previous studies of iridates have shown that an interplay of strong SOI, Coulomb interaction U, Hund’s rule coupling and crystalline electric fields result in unexpected insulating states with complex magnetic states. The novel J_eff =1/2 insulating state first observed in Sr₂IrO₄ is a direct consequence of such an intriguing interplay and is one of the central foci of this dissertation study.

The work presented here consists of three projects: (1) Effects of Tb doping on Sr₂IrO₄ having tetravalent Ir⁴⁺(5d⁵) ions; (2) Emergence of unexpected magnetic states in double-perovskite (Ba …

Physical And Electronic Properties Of Nanoscale 2d Materials, Mathias J. Boland

Theses and Dissertations--Physics and Astronomy

There is a great push towards reducing the size scale of both electronic components and machines. Two dimensional materials, such as graphene, are ideal candidates towards this push, as they are naturally atomically thin. In the case of nanoscale machines, the mechanical properties of the material surfaces become increasingly important. The use of laminar materials, such as graphene and MoS₂, to modify the surface properties, yet maintain nanoscale topographical features, are very attractive. Towards this goal, we have investigated the surface properties of MoS₂ at the nanoscale using Lateral Force Microscopy (LFM). In these investigations, we measure …

Chemical Ecology Of African Tephritid Fruit Flies, Ayuka T. Fombong, Donald L. Kachigamba, Baldwyn Torto

All Peer-Reviewed Publications

African Tephritid fruit flies are distributed in three main genera, Bactrocera, Ceratitis and Dacus constituting both indigenous and invasive species. They use a diverse and complex range of semiochemicals for host location and reproduction. This chapter reviews the identification of these semiochemicals and includes examples of lures developed from some of these chemicals for the management of economically important fruit fly species.

Analyses Of Mitochondrial Genes Reveal Two Sympatric But Genetically Divergent Lineages Of Rhipicephalus Appendiculatus In Kenya, Esther G. Kanduma, Joram M. Mwacharo, Naftaly W. Githaka, Peter W. Kinyanjui, Joyce N. Njuguna, Lucy M. Kamau, Edward Kariuki, Stephen Mwaura, Robert A. Skilton, Richard P. Bishop

All Peer-Reviewed Publications

Background: The ixodid tick Rhipicephalus appendiculatus transmits the apicomplexan protozoan parasite Theileria parva, which causes East coast fever (ECF), the most economically important cattle disease in eastern and southern Africa. Recent analysis of micro- and minisatellite markers showed an absence of geographical and host-associated genetic sub-structuring amongst field populations of R. appendiculatus in Kenya. To assess further the phylogenetic relationships between field and laboratory R. appendiculatus tick isolates, this study examined sequence variations at two mitochondrial genes, cytochrome c oxidase subunit I (COI) and 12S ribosomal RNA (rRNA), and the nuclear encoded ribosomal internal transcribed spacer 2 (ITS2) of the …

Role Of Microsatellite Markers In Molecular Population Genetics Of Fruit Flies With Emphasis On The Bactrocera Dorsalis Invasion Of Africa, Fathiya M. Khamis, Anna R. Malacrida

All Peer-Reviewed Publications

Microsatellites, also referred to as short tandem repeats (STRs) or simple sequence repeats (SSRs) are short sequences of tandem repeats of 1-6 bp in length in clusters of less than 150 bp flanked by sections of non-repetitive unique sequences that are scattered throughout the nuclear genome. These markers are co-dominant and hypervariable, revealing many alleles per locus; they are inherited in Mendelian fashion making them useful for detecting genetic variability within species. Once isolated and characterized, microsatellites can also be used in closely related taxa. Microsatellites can be amplified, even from highly degraded DNA, and are very simple to score. …

Ratcheting And Energetic Aspects Of Synchronization In Coupled Bursting Neurons, E. Marius Yamakou, E. Maeva Inack, F. M. Moukam Kakmeni

All Peer-Reviewed Publications

In this paper, we investigate the dynamics of two coupled bursting neurons. The Hindmarsh–Rose mathematical model of the neuron subjected to an external periodic stimulus is considered. We transform this model into that of the one-dimensional problem of a particle driven by a periodic external force under the influence of a double-well potential. We study the bifurcation structures, chaotic behavior, and the synchronization dynamics of the transformed model. Numerical simulations reveal the existence of some bifurcation structures including saddle-node, symmetry-breaking, and period-doubling route to chaos. By varying the system’s parameters, we also find thresholds for which the system remains periodic. …

Fabrication Of Multifunctional Nanostructured Porous Materials, Ahmed A. Farghaly

Theses and Dissertations

Nanostructured porous materials generally, and nanoporous noble metals specifically, have received considerable attention due to their superior chemical and physical properties over nanoparticles and bulk counterparts. This dissertation work aims to develop well-established strategies for the preparation of multifunctional nanostructured porous materials based on the combination of inorganic-chemistry, organic-chemistry and electrochemistry. The preparation strategies involved one or more of the following processes: sol-gel synthesis, co-electrodeposition, metal ions reduction, electropolymerization and dealloying or chemical etching. The study did not stop at the preparation limits but extended to investigate the reaction mechanism behind the formation of these multifunctional nanoporous structures in order …