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Articles 1  30 of 2296
FullText Articles in Physical Sciences and Mathematics
An Airlifted Tidal Mesocosm For Oil Degradation Studies, Daniel Christopher Alt
An Airlifted Tidal Mesocosm For Oil Degradation Studies, Daniel Christopher Alt
LSU Doctoral Dissertations
Mesocosms were constructed to allow scientists to isolate variables in a microtidal marsh environment, mimicking the natural conditions found in Terrebonne Bay. The control offered by these mesocosms is given by a process control system that takes user inputs and automates water movement. Twelve mesocosms were constructed, each holding 4.02 m^{3 }(142 ft^{3}) of marsh soil and 3.88 m^{3} (137 ft^{3}) of water to give 3 experimental levels and a control, all in triplicate.
Each mesocosms that was constructed contained marsh plants in soil plugs 9 feet in diameter and 3 feet deep. These ...
Atomic Force Microscopy TipEnhanced Laser Ablation, Fan Cao
Atomic Force Microscopy TipEnhanced Laser Ablation, Fan Cao
LSU Doctoral Dissertations
In the present work, an apertureless atomic force microscope (AFM) tipenhanced laser ablation (TELA) system was developed and investigated. An AFM was coupled to an optical parametric oscillator (OPO) wavelength tunable laser for sample ablation with a submicron sampling size. The AFM was used to image the surface and hold the AFM tip 10 nm above the sample surface. The AFM tip is coated with a layer of gold with a thickness of 35 nm. The incident laser wavelength was tuned in the visible and nearinfrared (IR) region and focused on the AFM tip. With the tipenhancement effect, ablation craters ...
Composition Of Gaussian Noises From Successive Convex Integrations, Amites Dasgupta
Composition Of Gaussian Noises From Successive Convex Integrations, Amites Dasgupta
Communications on Stochastic Analysis
No abstract provided.
Random Matrices, Continuous Circular Systems And The Triangular Operator, Romuald Lenczewski
Random Matrices, Continuous Circular Systems And The Triangular Operator, Romuald Lenczewski
Communications on Stochastic Analysis
No abstract provided.
Generalized Stochastic Burgers' Equation With NonLipschitz Diffusion Coefficient, Vivek Kumar, Ankik Kumar Giri
Generalized Stochastic Burgers' Equation With NonLipschitz Diffusion Coefficient, Vivek Kumar, Ankik Kumar Giri
Communications on Stochastic Analysis
No abstract provided.
Global Strong Solutions Of The Stochastic Three Dimensional Inviscid Simplified Bardina Turbulence Model, Manil T. Mohan
Global Strong Solutions Of The Stochastic Three Dimensional Inviscid Simplified Bardina Turbulence Model, Manil T. Mohan
Communications on Stochastic Analysis
No abstract provided.
Limiting Means For Spherical Slices, Amy Peterson, Ambar Sengupta
Limiting Means For Spherical Slices, Amy Peterson, Ambar Sengupta
Communications on Stochastic Analysis
No abstract provided.
Normally Ordered Disentanglement Of MultiDimensional Schrödinger Algebra Exponentials, Luigi Accardi, Andreas Boukas
Normally Ordered Disentanglement Of MultiDimensional Schrödinger Algebra Exponentials, Luigi Accardi, Andreas Boukas
Communications on Stochastic Analysis
No abstract provided.
Exponential Inequalities For Exit Times For Stochastic NavierStokes Equations And A Class Of Evolutions, PoHan Hsu, Padamanbhan Sundar
Exponential Inequalities For Exit Times For Stochastic NavierStokes Equations And A Class Of Evolutions, PoHan Hsu, Padamanbhan Sundar
Communications on Stochastic Analysis
No abstract provided.
Predicting PostProcedural Complications Using Neural Networks On MimicIii Data, Namratha Mohan
Predicting PostProcedural Complications Using Neural Networks On MimicIii Data, Namratha Mohan
LSU Master's Theses
The primary focus of this paper is the creation of a Machine Learning based algorithm for the analysis of large health based data sets. Our input was extracted from MIMICIII, a large Health Record database of more than 40,000 patients. The main question was to predict if a patient will have complications during certain specified procedures performed in the hospital. These events are denoted by the icd9 code 996 in the individuals' health record. The output of our predictive model is a binary variable which outputs the value 1 if the patient is diagnosed with the specific complication or ...
Singularity Resolution In Anisotropic And Black Hole Spacetimes In Loop Quantum Cosmology, Sahil Saini
Singularity Resolution In Anisotropic And Black Hole Spacetimes In Loop Quantum Cosmology, Sahil Saini
LSU Doctoral Dissertations
Loop quantum cosmology (LQC) has in recent years led to successful resolution of singularities in cosmological models while agreeing with general relativity in low curvature limit. Existence of a bounce and the possibility of an effective continuum description closely approximating the quantum evolution have been notable features of this singularity resolution. The effective spacetimes of loop quantized isotropic and BianchiI models have been shown to be geodesically complete and free from strong singularities. In this dissertation, we extend these results to effective loop quantized BianchiII, BianchiIX and KantowskiSachs models with arbitrary minimally coupled matter, and also explore the possibility of ...
HighThroughput Assessment Of A Novel, ThiolAcrylate Hydrogel For Tumor Spheroid Synthesis In A Microfluidic Device, Nathan Daniel Kersker
HighThroughput Assessment Of A Novel, ThiolAcrylate Hydrogel For Tumor Spheroid Synthesis In A Microfluidic Device, Nathan Daniel Kersker
LSU Master's Theses
The extracellular environment plays an important role in regulating cell behavior. The mechanical, structural, and compositional properties of the extracellular matrix can determine the fate of the growing cells. Standard twodimensional culturing in a flask fails to represent a native cellular environment. To create the native environment suitable for cells, hydrogels were previously studied. One of the most extensively studied synthetic hydrogels was a poly(ethylene glycol diacrylate) (PEGDA) hydrogel. However, the need for UV polymerization may introduce unwanted changes in cell morphology and viability. The hydrogel being proposed was a form of a thiolacrylate hydrogel that can eliminate this ...
The Effects Of Pressure And Magnetic Field On Phase Transitions And Related Physical Properties In Solid State Caloric Materials, Ahmad Ikhwan Us Saleheen
The Effects Of Pressure And Magnetic Field On Phase Transitions And Related Physical Properties In Solid State Caloric Materials, Ahmad Ikhwan Us Saleheen
LSU Doctoral Dissertations
Solidstate caloric effects, such as the magnetocaloric (MCE) and barocaloric (BCE) effects, may be utilized in future cooling technologies that are more efficient and environmentfriendly. Large caloric effects often occur near phase transitions, especially near coupled firstorder magnetostructural transitions (MST), and are initiated by external parameters, such as magnetic field or hydrostatic pressure. In this dissertation, the effects of pressure, temperature, and magnetic field on the phase transitions in three material systems are studied in order to elucidate how the respective caloric effects are affected.
In the first study, the realization of a coupled MST in a MnNiSibased system through ...
Beam Theory For Classical And Quantum Nonlinear OpticsExposing Classical And Quantum Correlations Of TransverseSpatial Modes, Robert Nicholas Lanning
Beam Theory For Classical And Quantum Nonlinear OpticsExposing Classical And Quantum Correlations Of TransverseSpatial Modes, Robert Nicholas Lanning
LSU Doctoral Dissertations
Optics is arguably the most important branch of physics that has ever been studied. It is not only an essential ingredient of many other branches of physics that we study, it governs how we see, how we measure, and how we communicate in the modern world. And as the world continues to change, so do our tools and resources. In a relatively short amount of time, we have progressed from rudimentary tools that shape the world around us, to tools that harness the fundamental laws of nature. Unsurprisingly, the laws of nature governing optics remain paramount. This is because many ...
Longitudinal Study Of The Attitudes And Behaviors Of Environmental Education Program Participants., Kasie R. Dugas
Longitudinal Study Of The Attitudes And Behaviors Of Environmental Education Program Participants., Kasie R. Dugas
LSU Master's Theses
The goal of this longitudinal study was to measure the attitudes and behaviors of participants of the Marsh Maneuvers program over the course of the last 25 years. The goal of the Marsh Maneuvers program is to educate students into becoming environmentally literate adults. Environmental literacy is considered herein to be people possessing knowledge about and positive attitudes and behaviors towards the environment. Although students learn basic science and environmental knowledge in the classroom, true environmental literacy is believed to require more handson understanding of the material. To evaluate the effectiveness of the program, the following three objectives were completed ...
Effective Visualization Approaches For UltraHigh Dimensional Datasets, Gurminder Kaur
Effective Visualization Approaches For UltraHigh Dimensional Datasets, Gurminder Kaur
LSU Doctoral Dissertations
Multivariate informational data, which are abstract as well as complex, are becoming increasingly common in many areas such as scientific, medical, social, business, and so on. Displaying and analyzing large amounts of multivariate data with more than three variables of different types is quite challenging. Visualization of such multivariate data suffers from a high degree of clutter when the numbers of dimensions/variables and data observations become too large. We propose multiple approaches to effectively visualize large datasets of ultrahigh number of dimensions by generalizing two standard multivariate visualization methods, namely star plot and parallel coordinates plot. We refine three ...
Observation Of HighEnergy GammaRays With The Calorimetric Electron Telescope (Calet) OnBoard The International Space Station, Nicholas Wade Cannady
Observation Of HighEnergy GammaRays With The Calorimetric Electron Telescope (Calet) OnBoard The International Space Station, Nicholas Wade Cannady
LSU Doctoral Dissertations
The CALorimetric Electron Telescope (CALET) is a multiinstrument highenergy astrophysics observatory deployed to the International Space Station (ISS) in August 2015. The primary instrument is the calorimeter (CAL), which is intended for measurement of the cosmic ray electron flux in the energy range 10 GeV  20 TeV. The CAL is also sensitive to gammarays in the energy range 1 GeV  10 TeV and protons and nuclei up to PeV energies. Also present on the CALET payload are an Advanced Stellar Compass (ASC) for the fine determination of the pointing direction and the CALET Gammaray Burst Monitor (CGBM) for the observation ...
Bipartite Quantum Interactions: Entangling And Information Processing Abilities, Siddhartha Das
Bipartite Quantum Interactions: Entangling And Information Processing Abilities, Siddhartha Das
LSU Doctoral Dissertations
The aim of this thesis is to advance the theory behind quantum information processing tasks, by deriving fundamental limits on bipartite quantum interactions and dynamics. A bipartite quantum interaction corresponds to an underlying Hamiltonian that governs the physical transformation of a twobody open quantum system. Under such an interaction, the physical transformation of a bipartite quantum system is considered in the presence of a bath, which may be inaccessible to an observer. The goal is to determine entangling abilities of such arbitrary bipartite quantum interactions. Doing so provides fundamental limitations on information processing tasks, including entanglement distillation and secret key ...
Theoretical Studies Of Ultrafast Electron Dynamics In Atoms And Molecules Via HighOrder Harmonic Generation, Paul Vincent Abanador
Theoretical Studies Of Ultrafast Electron Dynamics In Atoms And Molecules Via HighOrder Harmonic Generation, Paul Vincent Abanador
LSU Doctoral Dissertations
The interaction of atoms and molecules with strong laser pulses is of fundamental interest in physics and chemistry. Notably, the process known as highorder harmonic generation (HHG) refers to the production of extremeultraviolet (XUV) light, which occurs when an ensemble of atoms or molecules is subjected to a strong infrared laser field. Characterized by an attosecond time scale (1 as = 10^{18} s), the HHG process provides the capability for experimental measurements to capture the ultrafast motion of electrons in these target atoms and molecules. The underlying physical mechanism behind this process naturally leaves imprints in the properties of the ...
A Decomposition Of A Space Of Multiple Wiener Integrals By The Difference Of Two Independent Lévy Processes In Terms Of The Lévy Laplacian, Atsushi Ishikawa
A Decomposition Of A Space Of Multiple Wiener Integrals By The Difference Of Two Independent Lévy Processes In Terms Of The Lévy Laplacian, Atsushi Ishikawa
Communications on Stochastic Analysis
No abstract provided.
An Asymptotic Comparison Of Two TimeHomogeneous Pam Models, HyunJung Kim, Sergey Vladimir Lototsky
An Asymptotic Comparison Of Two TimeHomogeneous Pam Models, HyunJung Kim, Sergey Vladimir Lototsky
Communications on Stochastic Analysis
No abstract provided.
A Stochastic Integral By A NearMartingale, Shinya Hibino, HuiHsiung Kuo, Kimiaki Saitô
A Stochastic Integral By A NearMartingale, Shinya Hibino, HuiHsiung Kuo, Kimiaki Saitô
Communications on Stochastic Analysis
No abstract provided.
Directional Malliavin Derivatives: A Characterisation Of Independence And A Generalised Chain Rule, Stefan Koch
Directional Malliavin Derivatives: A Characterisation Of Independence And A Generalised Chain Rule, Stefan Koch
Communications on Stochastic Analysis
No abstract provided.
Nonlocal Diffusions And The Quantum BlackScholes Equation: Modelling The Market Fear Factor, Will Hicks
Nonlocal Diffusions And The Quantum BlackScholes Equation: Modelling The Market Fear Factor, Will Hicks
Communications on Stochastic Analysis
No abstract provided.
Reversibility Checking For Markov Chains, P. H. Brill, Chi Ho Cheung, Myron Hlynka, Q. Jiang
Reversibility Checking For Markov Chains, P. H. Brill, Chi Ho Cheung, Myron Hlynka, Q. Jiang
Communications on Stochastic Analysis
No abstract provided.
Parametric Family Of Sdes Driven By Lévy Noise, Suprio Bhar, Barun Sarkar
Parametric Family Of Sdes Driven By Lévy Noise, Suprio Bhar, Barun Sarkar
Communications on Stochastic Analysis
No abstract provided.
Impacts Of Updated Design Rainfall Values On Louisiana Infrastructure, Mario Durbic
Impacts Of Updated Design Rainfall Values On Louisiana Infrastructure, Mario Durbic
LSU Master's Theses
The Louisiana Department of Transportation and Development (LADOTD) has a Hydraulics Manual which sets forth drainage design standards and codes for projects. The Manual contains maximum annual 24hour rainfall maps and IntensityDurationFrequency (IDF) curves for the return periods of 2, 5, 10, 25, 50, and 100 years. The Manual divides Louisiana into three regions and specifies that all of the cities within a given region should use the same estimated rainfall intensities and rainfall depths. NOAA Atlas 14, the PrecipitationFrequency Atlas of United States, contains the latest rainfall data and statistics for much of the United States and provides the ...
HighDimensional Isotope Relationships, Yuyang He
HighDimensional Isotope Relationships, Yuyang He
LSU Doctoral Dissertations
Highdimensional isotope relationships describes the relationships of two or more element or positionspecific (PS) elements in the same molecule or ion. It provides us more powerful tools to study reaction mechanisms and dynamics. Chapter 1 is about dual or multiple stable isotope relationship on δδ (or δ'δ') space. While temporal data sampled from a closedsystem can be treated by a Rayleigh Distillation Model (RDM), spatial data should be treated by a ReactionTransport Model (RTM). Here we compare the results of a closedsystem RDM to a RTM for systems with diffusional mass transfer by simulating the trajectories on nitrate's ...
Third Generation Gamma Camera Spect System, Narayan Bhusal
Third Generation Gamma Camera Spect System, Narayan Bhusal
LSU Master's Theses
Single Photon Emission Computed Tomography (SPECT) is a noninvasive imaging modality, frequently used in myocardial perfusion imaging. The biggest challenges facing the majority of clinical SPECT systems are low sensitivity, poor resolution, and the relatively high radiation dose to the patient. New generation systems (GE Discovery, DSPECT) dedicated to cardiac imaging improve sensitivity by a factor of 58. The purpose of this work is to investigate a new gamma camera design with 21 hemiellipsoid detectors each with a pinhole collimator for Cardiac SPECT for further improvement in sensitivity, resolution, imaging time, and radiation dose.
To evaluate the resolution of our ...
Using Local Fishery Monitoring To Understand SmallScale Coastal Fisheries In Tanzania, Matthew Robertson
Using Local Fishery Monitoring To Understand SmallScale Coastal Fisheries In Tanzania, Matthew Robertson
LSU Master's Theses
Nearshore marine fisheries provide the main source of protein for nearly 9 million people in the coastal villages of Tanzania, yet for decades the fisheries have shown signs of overexploitation. These fisheries are smallscale and comanaged by local coastal communities in groups known as Beach Management Units (BMUs). BMUs monitor individual fishing trip data (e.g. gear, vessel, taxa); however, these data have only been analyzed in nationally aggregated statistics and to our knowledge, are not presently used in management decision making. The present thesis aimed to identify the forms of data and information that local fishery monitoring can record ...