Limitations On Protecting Information Against Quantum Adversaries, 2020 Louisiana State University

#### Limitations On Protecting Information Against Quantum Adversaries, Eneet Kaur

*LSU Doctoral Dissertations*

The aim of this thesis is to understand the fundamental limitations on secret key distillation in various settings of quantum key distribution. We first consider quantum steering, which is a resource for one-sided device-independent quantum key distribution. We introduce a conditional mutual information based quantifier for quantum steering, which we call intrinsic steerability. Next, we consider quantum non-locality, which is a resource for device-independent quantum key distribution. In this context, we introduce a quantifier, intrinsic non-locality, which is a monotone in the resource theory of Bell non-locality. Both these quantities are inspired by intrinsic information and squashed entanglement and are ...

Investigation Of The Obscure Spin State Of Ti-Doped Cdse, 2020 University of North Florida

#### Investigation Of The Obscure Spin State Of Ti-Doped Cdse, J. Dimuna, T. Boyett, I. Miotkowski, A. K. Ramdas, T. Pekarek

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

Using computational and experimental techniques, we examine the nature of the 2+ oxidation of Ti-doped CdSe. Through stoichiometry and confirmed through magnetization measurements, the weakly-doped material of Cd1-xTixSe (x = 0.0043) shows the presence of a robust spin-1 magnetic state of Ti, which is indicative of a 2+ oxidation state. Given the obscure nature of the Ti2+ state, we investigate the electronic and magnetic states using density functional theory. Using a generalized gradient approximation with an onsite potential, we determine the electronic structure, magnetic moment density, and optical properties for a supercell of CdSe with an ultra-low concentration of Ti ...

Extended Gamma Analysis Of Snr G330.2 + 1.0, 2020 University of North Florida

#### Extended Gamma Analysis Of Snr G330.2 + 1.0, Abagael Barba

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

Analyzing gamma rays is an important aspect of modern astronomy and astrophysics, for they are the most powerful bands of energy on the electromagnetic spectrum. Comprehending gamma rays allows for deeper understanding of countless phenomena within our universe, such as cosmic rays. Cosmic rays are high energy particles thought to be formed via extremely violent explosions within our universe. These accelerated particles mirror conditions present in a supernova. A supernova is what occurs when a star at least 8 times as massive as our sun reaches the end of its lifespan and bursts. These explosions are the most powerful events ...

Understanding The Spin-Glass State Through The Magnetic Properties Of Mn-Doped Znte, 2020 University of North Florida

#### Understanding The Spin-Glass State Through The Magnetic Properties Of Mn-Doped Znte, A. Alcantara, S. Barrett, D. Matev, I. Miotkowski, A. K. Ramdas, T. Pekarek

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

Magnetic measurements on the spin-glass behavior in the bulk II-VI diluted magnetic semiconductor (DMS) ZnMnTe were made on two crystals of concentrations x = 0.43 and 0.55 taken from the same boule. Magnetization and density functional theory studies have shown paramagnetic behavior in both samples between 30 and 400 K. Below 30 K, there is a prominent peak at Tc = 15 and 23.6 K for concentrations x = 0.43 and 0.55, respectively. The splitting of the field cooled (FC) and zero field cooled (ZFC) data below this peak is indicative of a transition to a spin-glass state ...

Electronic And Magnetic Order As A Function Of Doping In Mixed-Valent La1-Xsrxmn03 Thin Films, 2020 University of North Florida

#### Electronic And Magnetic Order As A Function Of Doping In Mixed-Valent La1-Xsrxmn03 Thin Films, James Payne, Dakota Brown, Calleigh Brannan, Tom Pekarek

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

The rich phase diagram in mixed-valent manganites has been intensely studied in bulk crystals as a function of chemical doping. Here we study the effect of doping in La1-xSrxMnO3 thin films by varying the Sr/La ratio between samples. These thin films are grown using ozone assisted molecular beam epitaxy with carefully controlled stoichiometry for a range of doping from x = 0.0 to x = 0.5. Our electronic measurements reveal a crossover from a Mott insulator to a metallic ground state as x is increased. In the metallic ground state we observe a metal-to-insulator transition coincident with a ferromagnetic-to-paramagnetic ...

Iceact Monitoring And Data Analysis, 2020 University of North Florida

#### Iceact Monitoring And Data Analysis, Andre Sierra Alderete

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

The goal of the IceACT project is to establish an array of small ACTs deployed at the South Pole for neutrino detection, CR composition studies and high energy gamma ray detection. The IceCube Neutrino Observatory at the South Pole has detected these massless subatomic particles called neutrinos. These high-energy astronomical messengers provide us information to investigate the most violent astrophysical sources: events like exploding stars, gamma-ray bursts, and cataclysmic phenomena involving black holes and neutron stars. In particular, these neutrinos have no charge, and can travel across the universe without being scattered by interstellar magnetic fields. The main background for ...

On Negative Eigenvalues Of The Discrete Schrödinger Operator With Non-Local Potential, 2020 National University of Uzbekistan

#### On Negative Eigenvalues Of The Discrete Schrödinger Operator With Non-Local Potential, Zahriddin Muminov, Shukhrat Lakaev

*Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences*

On the d-dimensional lattice 𝕋^{d}, *d*= 1, 2 the discrete Schrödinger operator *H*_{λµ} with non-local potential constructed via the Dirac delta function and shift operator is considered. The dependency of negative eigenvalues of the operator on the parameters is explicitly derived.

On The Number Of The Discrete Spectrum Of Two-Particle Discrete Schröodinger Operators, 2020 National University of Uzbekistan

#### On The Number Of The Discrete Spectrum Of Two-Particle Discrete Schröodinger Operators, Zahriddin Muminov, Utkir Kuljanov, Shukhrat Alladustov

*Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences*

We consider a family of discrete Schrö dinger operators *h ^{d}(k)*, where

*k*is the two-particle quasi-momentum varying in 𝕋

^{d}=(−π,π]

*, associated to a system of two-particles on the*

^{d}*d*- dimensional lattice ℤ

^{d},

*d*>1. The CwikelLieb-Rozenblum (CLR)-type estimates are written for

*h*when the Fermi surface

^{d}(k)*E*(𝔢

_{k}^{-1}_{m}(k)) of the associated dispersion relation is a one point set at em(k), the bottom of the essential spectrum. Moreover, when the Fermi surface

*E*(𝔢

_{k}^{-1}_{m}(k)) is of dimension

*d−1*or

*d−2*, we ...

Improving Photon Number Resolution In Superconducting Nanowire Single-Photon Detectors With Integrated Impedance Tapers, 2020 University of North Florida

#### Improving Photon Number Resolution In Superconducting Nanowire Single-Photon Detectors With Integrated Impedance Tapers, Bladimiro E. Valbuena

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

Simulations are run to optimize the ability to resolve the number of photons detected from the pulse height by a Superconducting Nanowire Single-Photon Detector (SNSPD). This is set up in a manner that features an impedance-matching transmission line taper that provides a characteristic impedance which transitions from kΩ to 50 Ω, with the taper providing an effective load impedance that outputs pulses with not only larger amplitudes but also showed a distinct separation for multi-photon events. The first part of this project tries to computationally match the experimental results obtained by our collaborators at MIT. Once these results are achieved ...

Reduced Dimensionality Effects In Ferromagnetic Behavior In La1-Xsrxmno3, 2020 University of North Florida

#### Reduced Dimensionality Effects In Ferromagnetic Behavior In La1-Xsrxmno3, C. A. Brennan, M. P. Warusawithana, J. Payne, D. Brown

*Showcase of Osprey Advancements in Research and Scholarship (SOARS)*

We study the magnetic properties of La1-xSrxMnO3 samples for concentrations x, 0 ≤ x ≤ 0.5. An analysis is done to accurately determine the transition temperature or critical temperature. Magnetic phase diagrams showing the various concentrations at different temperatures will be determined for our thin films. Using the phase diagrams for both bulk and thin film materials can show how reducing the dimensionality from the third dimension to approaching the second-dimension affects the phase diagram.

Studies Of Oval Tube And Fin Heat Exchangers, 2020 Embry-Riddle Aeronautical University

#### Studies Of Oval Tube And Fin Heat Exchangers, Phillip Nielsen

*Discovery Day - Prescott*

Heating Ventilation and air-conditioning (HVAC) is a system which changes the temperature of the surroundings for the purposes of cooling or heating. This system requires energy to maintain a temperature difference from the outside temperature. This is important since minimized power is one of the requirements for the system to achieve a better efficiency. Optimizing the flow over the evaporator coils is one way to increase the cooling efficiency. This will reduce the power required to have a sustainable system. Optimizing the flow to increase the energy transfer between the fins and the incoming air could result in a greater ...

Evaluation Of Neutron Skyshine Contributions During Injection At An Electron Synchrotron Facility Using Fluka, 2020 Louisiana State University and Agricultural and Mechanical College

#### Evaluation Of Neutron Skyshine Contributions During Injection At An Electron Synchrotron Facility Using Fluka, Andrew D. Hastings

*LSU Master's Theses*

The Center for Advanced Microstructures and Devices (CAMD) is a 1.5 giga-electron volt (GeV) electron synchrotron research facility under the jurisdiction of Louisiana State University (LSU). When originally constructed in 1992, CAMD was surrounded by pasture and woodland. Over the past several years, urban development of the area has found CAMD bracketed by a shopping center, apartment complex, and business offices. These developments raised concerns amongst the CAMD radiation safety personnel regarding an increased potential for public exposure to radiation. To ensure compliance with the annual public effective dose equivalent limit of 1 milli-sievert (mSv), the radiation monitoring program ...

Connecting The Nano And The Macro: A Study Of Pore Structure In Carbon Black Nanocomposites, 2020 Grand Valley State University

#### Connecting The Nano And The Macro: A Study Of Pore Structure In Carbon Black Nanocomposites, Evangalene Dreyer

*Student Scholars Day Posters*

Positronium Annihilation Lifetime Spectroscopy (or PALS) uses the lifetime of the bound state of the electron and its antiparticle, the positron (positronium), to determine the pore size, a nanoscale property. By measuring the evolution of pore size as a function of temperature one can determine the phase. Additionally, a macroscopic property called Young’s Modulus affects how much the sample is capable of stretching when a known force is applied. Thus, by measuring the pore size and Young’s Modulus, it is possible to gain a better understanding of how alterations at the microscopic level (pore size) affect the macroscopic ...

Size-Controlled Synthesis Of Nickel Nanoparticles Enclosed In Carbon Nanocages, 2020 Univeristy of Louisville

#### Size-Controlled Synthesis Of Nickel Nanoparticles Enclosed In Carbon Nanocages, Felicity Peebles, Grigorii Rudakov

*Undergraduate Arts and Research Showcase*

We have demonstrated a simple, scalable, and tunable method of obtaining densely packed Ni Nanoparticles encapsulated in Carbon Nanocages (Ni@CNCs). Using a facile method, it was shown that via a simple annealing process of precursor based on nickel acetate and citric acid, Ni@CNCs with sizes varying from 5 to 20 nm can be synthesized by changing the heating ramp rate during the synthesis from 25 to 53 °C/min. The final temperature of 600 °C was held for 10 min, and was the same for all the samples. X-Ray Diffraction (XRD) multiple peaks analysis was performed to show ...

Manipulating Magnetism In The Topological Semimetal Eucd2as2, 2020 Iowa State University and Ames Laboratory

#### Manipulating Magnetism In The Topological Semimetal Eucd2as2, Na Hyun Jo, Brinda Kuthanazhi, Yun Wu, Erik I. Timmons, Tae-Hoon Kim, Lin Zhou, Lin-Lin Wang, Benjamin G. Ueland, Andriy Palasyuk, Dominic H. Ryan, Robert J. Mcqueeney, Kyungchan Lee, Benjamin Schrunk, Anton A. Burkov, Ruslan Prozorov, Sergey L. Bud’Ko, Adam Kaminski, Paul C. Canfield

*Physics and Astronomy Publications*

EuCd2As2 is a magnetic semimetal that has the potential of manifesting nontrivial electronic states, depending on its low temperature magnetic ordering. Here, we report the successful synthesis of single crystals of EuCd2As2 that order ferromagnetically or antiferromagnetically depending on the level of band filling, thus allowing for the use of magnetism to tune the topological properties within the same host. We explored their physical properties via magnetization, electrical transport, heat capacity, and angle-resolved photoemission spectroscopy measurements and conclude that EuCd2As2 is an excellent, tunable system for exploring the interplay of magnetic ordering and topology.

Competing Pairing Interactions Responsible For The Large Upper Critical Field In A Stoichiometric Iron-Based Superconductor Cakfe4as4, 2020 University of Oxford

#### Competing Pairing Interactions Responsible For The Large Upper Critical Field In A Stoichiometric Iron-Based Superconductor Cakfe4as4, Matthew Bristow, William Knafo, Pascal Reiss, William R. Meier, Paul C. Canfield, Stephen J. Blundell, Amalia I. Coldea

*Physics and Astronomy Publications*

The upper critical field of multiband superconductors is an important quantity that can reveal details about the nature of the superconducting pairing. Here we experimentally map out the complete upper-critical-field phase diagram of a stoichiometric superconductor, CaKFe4As4, up to 90T for different orientations of the magnetic field and at temperatures down to 4.2K. The upper critical fields are extremely large, reaching values close to ∼3Tc at the lowest temperature, and the anisotropy decreases dramatically with temperature, leading to essentially isotropic superconductivity at 4.2K. We find that the temperature dependence of the upper critical field can be well described ...

Got Science? Club, 2020 University of Nebraska - Lincoln

#### Got Science? Club, Nora Husein, Randa Ismail

*Honors Expanded Learning Clubs*

Got Science? Club allows students to learn about the science that can be found in our daily lives using everyday items such as food and school supplies. Students will learn about these sciences through hands-on experiments, allowing them to truly experience the science around them.

Sulfur Dioxide From The Atmospheric Chemistry Experiment Satellite, 2020 Old Dominion University

#### Sulfur Dioxide From The Atmospheric Chemistry Experiment Satellite, Doug Cameron

*College of Sciences Posters*

The version 4.0 dataset from the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS) on SCISAT, released in March of 2019, has sulfur dioxide (SO_{2}) volume mixing ratio (VMR) profiles as a routine data product. From this dataset, global SO_{2} distributions between the altitudes of 10.5 km and 23.5 km are analyzed. The global distribution of all SO_{2} VMR data by altitude is broken down into 30° and 5° latitude zones. Seasonality of the global SO_{2} distribution is explored. Volcanic SO_{2} plumes are isolated in the dataset and compared with extinction data from ...

Giving Students A Better Understanding Of The Concepts Behind The Coriolis Force, 2020 Utah State University

#### Giving Students A Better Understanding Of The Concepts Behind The Coriolis Force, Ridge Cole

*Physics Capstone Projects*

The Coriolis force is a physical phenomenon that has proven difficult for students to understand for centuries. While the mathematical approach to teaching this phenomenon is well known and outlined, the concepts behind this force have proven to be very elusive to students. Through the use of modern technology and new ways of presenting these concepts, we hope to give students a clear understanding of the Coriolis force in the future.

Towards A Real-Time Fully-Coherent All-Sky Search For Gravitational Waves From Compact Binary Coalescences Using Particle Swarm Optimization, 2020 University of Texas at San Antonio

#### Towards A Real-Time Fully-Coherent All-Sky Search For Gravitational Waves From Compact Binary Coalescences Using Particle Swarm Optimization, M. E. Normandin, Soumya Mohanty

*Physics and Astronomy Faculty Publications and Presentations*

While a fully-coherent all-sky search is known to be optimal for detecting gravitational wave signals from compact binary coalescences, its high computational cost has limited current searches to less sensitive coincidence-based schemes. Following up on previous work that has demonstrated the effectiveness of particle swarm optimization (PSO) in reducing the computational cost of this search, we present an implementation that achieves near real-time computational speed. This is achieved by combining the search efficiency of PSO with a significantly revised and optimized numerical implementation of the underlying mathematical formalism along with additional multithreaded parallelization layers in a distributed computing framework. For ...