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Articles 1411 - 1440 of 3417
Full-Text Articles in Physical Sciences and Mathematics
Reformulations For Control Systems And Optimization Problems With Impulses, Jacob Blanton
Reformulations For Control Systems And Optimization Problems With Impulses, Jacob Blanton
LSU Doctoral Dissertations
This dissertation studies two different techniques for analyzing control systems whose dynamics include impulses, or more specifically, are measure-driven. In such systems, the state trajectories will have discontinuities corresponding to the atoms of the Borel measure driving the dynamics, and these discontinuities require further definition in order for the control system to be treated with the broad range of results available to non-impulsive systems. Both techniques considered involve a reparameterization of the system variables including state, time, and controls. The first method is that of the graph completion, which provides an explicit reparameterization of the time and state variables. The …
Extremal Problems In Matroid Connectivity, John Tyler Moss
Extremal Problems In Matroid Connectivity, John Tyler Moss
LSU Doctoral Dissertations
Matroid k-connectivity is typically defined in terms of a connectivity function. We can also say that a matroid is 2-connected if and only if for each pair of elements, there is a circuit containing both elements. Equivalently, a matroid is 2-connected if and only if each pair of elements is in a certain 2-element minor that is 2-connected. Similar results for higher connectivity had not been known. We determine a characterization of 3-connectivity that is based on the containment of small subsets in 3-connected minors from a given list of 3-connected matroids. Bixby’s Lemma is a well-known inductive tool in …
Enhancement Of Gulf Killifish, Fundulus Grandis, Fitness And Reproduction, Joshua Thomas Patterson
Enhancement Of Gulf Killifish, Fundulus Grandis, Fitness And Reproduction, Joshua Thomas Patterson
LSU Doctoral Dissertations
Gulf killifish, Fundulus grandis, shows promise for commercial development as a marine baitfish species. Significant markets for F. grandis already exist throughout the Gulf Coast, with the vast majority of supply coming from wild-harvests, which can be hampered by seasonal availability and inconsistent fish health and size. The genus Fundulus also represents an important group of model vertebrates for biological study. A recent review paper described this genus as the premier teleost model for environmental biology. New information generated as a result of the work contained in this dissertation may be more broadly applicable to sister species of F. grandis, …
Ito Formula And Girsanov Theorem On A New Ito Integral, Yun Peng
Ito Formula And Girsanov Theorem On A New Ito Integral, Yun Peng
LSU Doctoral Dissertations
The celebrated Ito theory of stochastic integration deals with stochastic integrals of adapted stochastic processes. The Ito formula and Girsanov theorem in this theory are fundamental results which are used in many applied fields, in particular, the finance and the stock markets, e.g. the Black-Scholes model. In chapter 1 we will briefly review the Ito theory. In recent years, there have been several extension of the Ito integral to stochastic integrals of non-adapted stochastic processes. In this dissertation we will study an extension initiated by Ayed and Kuo in 2008. In Chapter 2 we review this new stochastic integral and …
Some Numerical And Phenomenological Studies In Loop Quantum Cosmology, Brajesh Kumar Gupt
Some Numerical And Phenomenological Studies In Loop Quantum Cosmology, Brajesh Kumar Gupt
LSU Doctoral Dissertations
A key feature of the singularity resolution in loop quantum cosmology (LQC) is the occurrence of the quantum bounce when the spacetime curvature becomes comparable to the Planck scale. The presence of quantum bounce greatly modifies the dynamics of the early universe and can have important implications for observational signatures. Although the quantum bounce has been previously studied via numerical methods for initial conditions that correspond to large macroscopic universes at late times, a detailed study of the robustness of the quantum bounce for a generic class of initial condition has so far been missing due to severe computational challenges. …
Adopting Star Plot For Visualization Of High Dimensional Multivariate Data, Shabana Sangli
Adopting Star Plot For Visualization Of High Dimensional Multivariate Data, Shabana Sangli
LSU Master's Theses
The Star Plot is one of popular methods for visualization of multivariate data. This method displays each data record as a star-shaped icon by mapping all variables (dimensions) on radiating rays (axes) originated from a single point. The number of such icons is equal to the number of data items (records). As the number of dimensions and the size of data set increase, Star Plot visualization soon becomes too cluttered because many rays have to be accommodated within small circular area and individual icons also become too small. To overcome these problems associated with visualization of high-dimensional multivariate data, we …
Effect Of The Bp Deepwater Horizon Oil Spill On Critical Marsh Soil Microbial Functions, Jason Paul Pietroski
Effect Of The Bp Deepwater Horizon Oil Spill On Critical Marsh Soil Microbial Functions, Jason Paul Pietroski
LSU Master's Theses
On April 20, 2010, the BP Deepwater Horizon (DWH) offshore oil platform exploded releasing ~ 795 million L of southern Louisiana (LA) light sweet crude oil into the Gulf of Mexico. Approximately 7.9 million liters of dispersant, Corexit EC9500A, were applied for remediation. The effect of BP DWH crude oil and Corexit EC9500A on two marsh soil microbial processes, (mineralizable nitrogen and denitrification), were examined in the laboratory. Surface soil samples were collected from an unimpacted salt marsh site proximal to areas that suffered light to heavily oiling in Barataria Bay, LA. Additions of oil were at a ratio of …
A Study On Fairness And Latency Issues Over High Speed Networks And Data Center Networks, Lin Xue
A Study On Fairness And Latency Issues Over High Speed Networks And Data Center Networks, Lin Xue
LSU Doctoral Dissertations
Newly emerging computer networks, such as high speed networks and data center networks, have characteristics of high bandwidth and high burstiness which make it difficult to address issues such as fairness, queuing latency and link utilization. In this study, we first conduct extensive experimental evaluation of the performance of 10Gbps high speed networks. We found inter-protocol unfairness and larger queuing latency are two outstanding issues in high speed networks and data center networks. There have been several proposals to address fairness and latency issues at switch level via queuing schemes. These queuing schemes have been fairly successful in addressing either …
Particle Formation In Ambient Mass Spectrometry, Thabiso Musapelo
Particle Formation In Ambient Mass Spectrometry, Thabiso Musapelo
LSU Doctoral Dissertations
A particle sizing system was developed that couples a light scattering particle sizer with a differential mobility analyzer for particle detection and elucidation with the capability for measuring particle sizes in the range of 10 nm to 20 μm. The particle sizing system was used to investigate particle formation that is associated with several methods of atmospheric pressure ion formation used in mass spectrometry: atmospheric pressure matrix-assisted laser desorption ionization (MALDI) and inlet ionization. The methods for particle formation were 1) ultraviolet (UV) laser ablation, 2) infrared (IR) laser ablation, and 3) shock-generated particle formation. Particles formed by UV laser …
On Matroid And Polymatroid Connectivity, Dennis Wayne Hall Ii
On Matroid And Polymatroid Connectivity, Dennis Wayne Hall Ii
LSU Doctoral Dissertations
Matroids were introduced in 1935 by Hassler Whitney to provide a way to abstractly capture the dependence properties common to graphs and matrices. One important class of matroids arises by taking as objects some finite collection of one-dimensional subspaces of a vector space. If, instead, one takes as objects some finite collection of subspaces of dimensions at most k in a vector space, one gets an example of a k-polymatroid.
Connectivity is a pivotal topic of study in the endeavor to understand the structure of matroids and polymatroids. In this dissertation, we study the notion of connectivity from several …
Synthetic Routes To Therapeutic Agents Via Masked Functionalities: From Orthogonal Peptide Crosslink To Photothermal Cancer Prodrug, Chyree Shantel Batton
Synthetic Routes To Therapeutic Agents Via Masked Functionalities: From Orthogonal Peptide Crosslink To Photothermal Cancer Prodrug, Chyree Shantel Batton
LSU Doctoral Dissertations
The theonellamides are a family of compounds distinguished by their crosslinking ô-histidinoalanine (ô-HAL) residue. Part one of this dissertation details the synthesis of an orthogonally protected ô-HAL building block that will be incorporated into a total synthesis of theonellamide C. Selective deprotection of each amine and acid of this orthogonally protected building block is also demonstrated. Various reaction partners for the assembly of ô-histidinoalanine were explored. One approach involved the coupling of N-Fmoc-â-iodoalanine benzyl ester and (Nðim)-blocked histidine nucleophiles including a fused bicyclic urea and a Boc-His(Nð-Pac)-OMe. While the imidazolium salts were identified by mass spectrometry, elimination of the iodide …
Syntheses And Characterization Of Isoporphyrins And Bodipys For Pdt And Imaging, Haijun Wang
Syntheses And Characterization Of Isoporphyrins And Bodipys For Pdt And Imaging, Haijun Wang
LSU Doctoral Dissertations
This Dissertation is divided into five chapters reporting various aspects of the background to my field of study and the results obtained during my research program. Chapter 1 gives a very brief introduction to photodynamic therapy including the mechanism of the treatment, the localization of photosensitizer in tumor cells, the pathways leading to tumor death and characteristics of various photosensitizers such as porphyrin-based photosensitizers and non-porphyrin based photosensitizers. Chapter 2 reports a total synthesis of zinc(II) isoporphyrins by cyclization of b-bilene salt using á-keto esters for the macrocyclization carbon. Functionalization of the resulting zinc(II) isoporphyrins was attempted using different strategies …
Microfluidic And Nanofluidic Devices - Mixed Scale Systems For Bioanalytical Applications, Michael David Vincent
Microfluidic And Nanofluidic Devices - Mixed Scale Systems For Bioanalytical Applications, Michael David Vincent
LSU Doctoral Dissertations
Developments in the field of microfluidics and nanofluidics allow an experimenter to employ new analytical techniques. One direction in which the field is moving towards is developing new devices and or instruments on the smallest scale possible. One way in which this can be achieved is by using a combination of top-down and bottom-up technologies. Some of these top-down techniques have been used in other fields such as the use of photolithography to fabricate semiconductors. Photolithography is a top-down method used to create features normally on the micrometer scale, but in order to create nanometer size features another top-down method …
Quantum Optical Metrology, Sensing And Imaging, Kebei Jiang
Quantum Optical Metrology, Sensing And Imaging, Kebei Jiang
LSU Doctoral Dissertations
In this dissertation we begin with a brief introduction to quantum optics concentrating on the topics of the noise of quantum optical states, quantum estimation theory, quantum interferometry and the atom-field interaction. This background is necessary for understanding the discussions in later chapters. In particular, quantum interferometry, which is optical interferometry when the light source is a quantum mechanical state, plays a central role in this dissertation. In Chapter 2 we discuss the phase estimation sensitivity of quantum metrology when photon loss is present. In Chapter 3 we extend the discussion to include the phase fluctuation of the system caused …
Combinatorial Minimal Free Resolutions Of Ideals With Monomial And Binomial Generators, Trevor Mcguire
Combinatorial Minimal Free Resolutions Of Ideals With Monomial And Binomial Generators, Trevor Mcguire
LSU Doctoral Dissertations
In recent years, the combinatorial properties of monomials ideals and binomial ideals have been widely studied. In particular, combinatorial interpretations of minimal free resolutions have been given in both cases. In this present work, we will generalize existing techniques to obtain two new results. If Lambda is an integer lattice in the n-dimensional integers satisfying some mild conditions, S is the polynomial ring with n variables and R is the group algebra of S[Lambda], then the first result is resolutions of Lambda-invariant submodules of the Laurent polynomial ring in n variables as R-modules. A consequence will be the ability to …
The Contribution Of Fly Ash Components To Pcdd/F Formation, Phillip M. Potter
The Contribution Of Fly Ash Components To Pcdd/F Formation, Phillip M. Potter
LSU Doctoral Dissertations
Chlorinated aromatics undergo surface-mediated reactions with metal oxides to form environmentally persistent free radicals (EPFRs) which can further react to produce polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). Previous work using laboratory-made fly ash surrogates composed of transition metal oxides deposited on silica powder has confirmed their ability to mimic fly ash in the production of PCDD/Fs. However, little is known about the propensity of alumina and aluminosilicates to form PCDD/Fs. Cooperative catalysis between transition metals in the formation of PCDD/Fs has also seen little research. A fly ash sample containing both alumina and mullite, an aluminosilicate, was tested for PCDD/F formation …
Paleoclimatology And Paleotempestology Study Of Blue Hole, Lighthouse Reef, Belize Through Geochemical Proxies, Laura Carolyn Sorey
Paleoclimatology And Paleotempestology Study Of Blue Hole, Lighthouse Reef, Belize Through Geochemical Proxies, Laura Carolyn Sorey
LSU Master's Theses
A large Pleistocene age sinkhole, the Blue Hole on Lighthouse Reef off the coast of Belize in the Caribbean Sea is the site of a well preserved sedimentary record that serves as paleoclimatology and paleotempestology archive. The nutrient-starved surface waters of the Blue Hole and the surrounding lagoons are “fertilized” by the seasonal introduction of cool, nutrient-rich waters upwelled from the Caribbean deep water. These waters, which stimulate production of organic materials within the surface waters, carry a heightened isotopic signature that is imparted to the organics resultant from upwelling-induced production. These organics are then incorporated into the predominantly carbonate …
Failed Agricultural Impoundments: An Interdisciplinary Assessment Of Community Structure And Social Resilience, Stacy Nicole Peterson
Failed Agricultural Impoundments: An Interdisciplinary Assessment Of Community Structure And Social Resilience, Stacy Nicole Peterson
LSU Master's Theses
The remnants of the wetland reclamation era of the early 1900s are visible in the leveed, drained, and failed impoundments across the United States, and especially in coastal regions. The common themes of their history are flooding, restoration, and – sometimes - community resilience. The physical changes occurring during and after impoundment, and after failure includes subsidence, erosion, and flooding are well-documented. Here I construct an environmental history that integrates data on these physical changes with archival records, historical documents, site visits and personal interviews. The primary region of focus is ‘Delta Farms’ - a failed agricultural impoundment in Lafourche …
Scheduling In Transactional Memory Systems: Models, Algorithms, And Evaluations, Gokarna Sharma
Scheduling In Transactional Memory Systems: Models, Algorithms, And Evaluations, Gokarna Sharma
LSU Doctoral Dissertations
Transactional memory provides an alternative synchronization mechanism that removes many limitations of traditional lock-based synchronization so that concurrent program writing is easier than lock-based code in modern multicore architectures. The fundamental module in a transactional memory system is the transaction which represents a sequence of read and write operations that are performed atomically to a set of shared resources; transactions may conflict if they access the same shared resources. A transaction scheduling algorithm is used to handle these transaction conflicts and schedule appropriately the transactions. In this dissertation, we study transaction scheduling problem in several systems that differ through the …
The Effects Of Modeling Instruction In A High School Physics Classroom, Mark E. Arseneault
The Effects Of Modeling Instruction In A High School Physics Classroom, Mark E. Arseneault
LSU Master's Theses
The purpose of this research was to study my effectiveness as a high school physics teacher using a traditional approach to instruction compared to a Modeling approach. The study was conducted at a high school near Baton Rouge, Louisiana. Both groups consisted of 1 section of honors physics and 1 section of regular physics each. Conceptual understanding and problems solving gains were measured using pre/post Force Concept Inventory (FCI) and the Mechanics Baseline Test (MBT) results, respectively. Students’ level of science reasoning was also measured at the beginning of the school year only, using the Classroom Test of Scientific Reasoning …
Habitat Associations Of Lower Mississippi River Floodplain Fishes On St. Catherine Creek National Wildlife Refuge, Alonda Mccarty
Habitat Associations Of Lower Mississippi River Floodplain Fishes On St. Catherine Creek National Wildlife Refuge, Alonda Mccarty
LSU Master's Theses
Each year, floodplain habitats are inundated and dewatered throughout the lower Mississippi River during the flood pulse. Many organisms, particularly fishes, are facultative or obligate users of inundated floodplain habitats for foraging and reproduction. The abundance and distribution of these fishes are influenced by annual floods, ranging from weeks to months depending on intensity and duration of the pulse. One major consequence of anthropogenic alterations to the river has been the sequential loss of connectivity of floodplain habitats. In light of these changes, a concentrated effort has been made to restore the integrity of the LMR floodplain. An integral part …
The Development Of A Novel Silicon On Insulator Microdosimeter With Sensitive Volumes Modeled After Living Cells, Anthony P. Mazza
The Development Of A Novel Silicon On Insulator Microdosimeter With Sensitive Volumes Modeled After Living Cells, Anthony P. Mazza
LSU Master's Theses
Purpose: The purpose of this work was to test the feasibility of using a silicon on insulator microdosimeter, which mimics the size and shape of particular cells within the human body, to determine dose equivalent from a 239PuBe neutron source with uncertainty less than 10%. Methods: A batch of microdosimeters were analyzed in terms of their physical surface conditions and basic diode characteristics such as leakage current as a function of bias voltage, to select those with the best performance. A calibration protocol was developed utilizing an 241Am alpha particle source and a reference tail pulse generator. Neutron spectra were …
Dgge Analysis Of Denitrifying Bacterial Diversity In Response To Nutrients And Oil Contamination In Salt Marshes, Catalina Restrepo
Dgge Analysis Of Denitrifying Bacterial Diversity In Response To Nutrients And Oil Contamination In Salt Marshes, Catalina Restrepo
LSU Master's Theses
Salt marsh ecosystems located at the Mississippi River delta are exposed to high levels of point and nonpoint sources of nutrients such as nitrate-based fertilizers and to oil spills in the Gulf of Mexico. However, there is little information on the effects of eutrophication and oil contamination on the bacterial diversity of denitrifying bacteria in salt marsh sediments of coastal Louisiana. The effects of excess nutrients on the bacterial diversity of denitrifiers were analyzed by injecting sediment cores with high concentrations of nitrate (100μM NO3- and 20,000μM NO3-) and carbon (0% and 20% C concentration from the original sample). After …
Channel-Levee Complexes And Sediment Flux Of The Upper Indus Fan, Taylor Landry Berlin
Channel-Levee Complexes And Sediment Flux Of The Upper Indus Fan, Taylor Landry Berlin
LSU Master's Theses
The Indus Fan with a volume of 4.5 million km³ is the second largest submarine fan on Earth, only behind its neighbor to the east The Bengal Fan. It formed off the passive margin of Pakistan-India in the northern Arabian Sea. One of the more important aspects of the Indus Fan is its mostly complete sediment record of what has been eroded from the western Himalayan and Karakoram Mountains which act as the main source for the Indus River system. Since the initiation of the Himalaya about 50 Ma, sedimentation rates have fluctuated. This study attempts to calculate a new …
Does The Jigsaw Method Improve Student Conceptual Knowledge In Physical Science?, Althea Alisa Morgan
Does The Jigsaw Method Improve Student Conceptual Knowledge In Physical Science?, Althea Alisa Morgan
LSU Master's Theses
ABSTRACT The goal of my research is to determine if the Jigsaw Method has an effect on student conceptual knowledge of Physical Science in a classroom setting that predominately uses cooperative learning. The assessment instruments that were given in pretest and posttest format to assess student knowledge were the Matter Concept Inventory (MCI) and Edusoft Assessments. The research study group consisted of two sections of a ninth grade Physical Science class (N = 42) in a rural high school in Louisiana. As an intervention prior to the study, students were introduced to working in cooperative learning groups. The students in …
Cdom Optical Properties Near Dwh Site, Gulf Of Mexico: Pot Oil Spill, Zhi Li
Cdom Optical Properties Near Dwh Site, Gulf Of Mexico: Pot Oil Spill, Zhi Li
LSU Master's Theses
The Deep Water Horizon (DWH) oil spill resulted in the largest accidental release of crude oil in U.S. waters with both short- and long-term effects on the marine environment. Extensive studies conducted immediately following the oil spill in the northern Gulf of Mexico provided greater understanding of the physical processes influencing the distribution of the released oil, including the use of optical detection of polycyclic aromatic hydrocarbons (PAHs), a toxic crude oil fraction in the northern Gulf of Mexico. In this study, the optical properties of chromophoric dissolved organic matter (CDOM) and the concentrations of dissolved organic carbon (DOC) were …
Evaluation Of Stromatolites From The 3.4 Ga Kromberg Formation, Barberton Greenstone Belt, South Africa, Corey E. Shircliff
Evaluation Of Stromatolites From The 3.4 Ga Kromberg Formation, Barberton Greenstone Belt, South Africa, Corey E. Shircliff
LSU Master's Theses
Silicified sedimentary rocks from the 3.4 Ga Kromberg Formation of the Barberton Greenstone Belt in South Africa contain laminated structures that have been identified as possible stromatolites in the field. Morphological evaluation and a variety of chemical analyses are presented here, in an effort to describe the samples in a sedimentary context and consider biogenicity of these laminated forms. Two major types of laminated structures were identified in the field – domical laminates and flat-laminated samples with little to no synoptic relief. The domical sample presents the best morphological evidence for biogenicity. There are several characteristics that suggest the deposition …
The Adoption Of State Wetland Policies: How Do Wetlands Fit Within The Theoretical Framework Of Environmental Policy Determinants?, Rachel Bogart Krech
The Adoption Of State Wetland Policies: How Do Wetlands Fit Within The Theoretical Framework Of Environmental Policy Determinants?, Rachel Bogart Krech
LSU Master's Theses
Wetlands are an extremely important natural resource in the United States. They offer storm surge protection, sediment stabilization, groundwater recharging, carbon sequestration, and habitat for many species. Despite their values, wetlands have a long history of being misunderstood. It was not until the mid-1970s that scientific understanding helped transform policy from that of rapid conversion to that of conservation. By this time, the lower 48 states had already lost 53 percent of its total wetlands. The nature of wetlands and federal limitations make the management of this natural resource a primarily state-based responsibility. However, the way that states construct their …
Polonium-210 Dynamics In The Northern Gulf Of Mexico, Patrick Robert Jones
Polonium-210 Dynamics In The Northern Gulf Of Mexico, Patrick Robert Jones
LSU Master's Theses
Polonium-210 (t1/2=138 d) is the most common among the 33 known radioisotopes of Polonium found in the natural environment. It is produced by the radioactive decay of its long-lived grandparent Lead-210(t1/2=22.3 d) via Bismuth-210 (t1/2=5.012 d) and forms as part of the natural Uranium-238 decay series. The primary hazard associated with Polonium-210 is its radioactivity, as an alpha particle emitter. Marine organisms receive their maximum radioactive dose in the natural environment from Polonium-210. Polonium has been known to bioaccumulate in the marine food web and can be potentially harmful to humans via the intake of certain marine organisms. Thus it …
Selected Problems On Matroid Minors, Jesse Taylor
Selected Problems On Matroid Minors, Jesse Taylor
LSU Doctoral Dissertations
This dissertation begins with an introduction to matroids and graphs. In the first chapter, we develop matroid and graph theory definitions and preliminary results sufficient to discuss the problems presented in the later chapters. These topics include duality, connectivity, matroid minors, and Cunningham and Edmonds's tree decomposition for connected matroids. One of the most well-known excluded-minor results in matroid theory is Tutte's characterization of binary matroids. The class of binary matroids is one of the most widely studied classes of matroids, and its members have many attractive qualities. This motivates the study of matroid classes that are close to being …