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Full-Text Articles in Physical Sciences and Mathematics

A Theoretical Framework For Design Space Exploration Of Manycore Processors, Hun Jung Jan 2011

A Theoretical Framework For Design Space Exploration Of Manycore Processors, Hun Jung

Computer Science and Engineering Dissertations - Archive

As design space and workload space in multicore era are continuously expanding, it is a challenge to identify optimal design points quickly during the early stage of multicore processor design or programming phase. To meet this challenge, a thread-level modeling methodology is developed in this dissertation. The idea is to model multicore processors at the thread-level, overlooking instruction-level and microarchitectural details. Since the thread-level modeling is much coarser than the instruction-level modeling, the analysis at this level turns out to be significantly faster than that at the instruction level. This feature makes the methodology particularly amenable to fast performance evaluation …

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Performance Analysis And Resource Allocation For Multithreaded Multicore Processors, Miao Ju Jan 2011

Performance Analysis And Resource Allocation For Multithreaded Multicore Processors, Miao Ju

Computer Science and Engineering Dissertations - Archive

With ever expanding design space and workload space in multicore era, a key challenge to program a multithreaded multicore processor is how to evaluate the performance of various possible program-task-to-core mapping choices and provide effective resource allocation during the initial programming phase, when the executable program is yet to be developed. In this dissertation, we put forward a thread-level modeling methodology to meet this challenge. The idea is to model thread-level activities only and overlook the instruction-level and microarchitectural details. A model developed at this level assumes the availability of only a piece of pseudo code that contains information about …

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New Macrocyclic Glycopeptide Antibiotic For Chiral Hplc Stationary Phases And Ionic Liquids In Analytical Chemistry, Xiaotong Zhang Jan 2011

New Macrocyclic Glycopeptide Antibiotic For Chiral Hplc Stationary Phases And Ionic Liquids In Analytical Chemistry, Xiaotong Zhang

Chemistry & Biochemistry Dissertations - Archive

The main focus of this dissertation is on the development of new chiral stationary phases for HPLC and GC and the application of ionic liquids in analytical chemistry. They will be discussed separately in two parts. Enantiomeric separations continue to be of great interest to the pharmaceutical industry. It is because drug molecules of opposite chirality often possess distinctive effects in biological environments. Direct chromatography is one of the major techniques used to address the challenge of enantiomeric analysis. Macrocyclic glycopeptides are a very useful class of chiral selectors for HPLC stationary phases because of their broad enantioselectivity. A study …

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The Development Of The Catalytic Wittig Reaction, Zachary S. Nixon Jan 2011

The Development Of The Catalytic Wittig Reaction, Zachary S. Nixon

Chemistry & Biochemistry Dissertations - Archive

The formation of carbon-carbon double bonds with stereocontrol is of great importance to synthetic chemistry. The Wittig olefination involves the treatment of an aldehyde or ketone with a phosphonium ylide; yielding an alkene product with concomitant phosphine oxide byproduct. Mechanistic studies have shown that structural and electronic properties of the phosphine and halide reagent greatly influence the stereochemical outcome (E:Z) of the olefination. However, a significant limitation of the reaction is the difficulty of removing the phosphine oxide. A process catalytic in phosphine would alleviate the aforementioned concern and allow enhanced stereocontrol. Preliminary results led to the development of the …

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Slowing Dna Translocation In A Biological Protein Α-Hemolysin Ion Channel, R. Samanthi S. De Zoysa Jan 2011

Slowing Dna Translocation In A Biological Protein Α-Hemolysin Ion Channel, R. Samanthi S. De Zoysa

Chemistry & Biochemistry Dissertations - Archive

During the past decade, nanopore DNA sequencing has emerged as a revolutionary prospect towards a "$1000 genome" goal set by U.S. National Institute of Health. In the nanopore approach, electrophoretic movement of polynucleotide molecules through a nanopore would provide transient current blockades that are unique to each molecule. Since kilobase length DNA can be read directly without amplification or use of costly reagents such as enzymes and fluorescent tags, the nanopore approach can significantly reduce the sequencing cost. However, due to the rapid DNA translocation velocity through the nanopore, accurate detection of single nucleotide bases via the electrophoretically driven approach …

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Ion Exchanger Based Ion Generation And Removal Devices. Behavior And Applications, Yongjing Chen Jan 2011

Ion Exchanger Based Ion Generation And Removal Devices. Behavior And Applications, Yongjing Chen

Chemistry & Biochemistry Dissertations - Archive

Ion exchangers have many important applications. In Ion chromatography (IC), ion exchangers are used as stationary phase and used in some of the key components. The innovations that make the modern IC the most popular techniques for ion analysis are closely related to ion exchangers. Using the ion exchangers and inspired by some of the innovations in electrolytic devices of IC, the research in this dissertation mainly consists of four parts: A charge detector (ChD) is a flow-through device where a cation exchange membrane (CEM) and anion exchange membrane (AEM) separating three channels. One electrode is disposed in each of …

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Mixed Lineage Luekemia Histone Methyltransferases In Hormonal Regulation Of Hoxb9 And Target Gene Regulation, Bishakha Shrestha Jan 2011

Mixed Lineage Luekemia Histone Methyltransferases In Hormonal Regulation Of Hoxb9 And Target Gene Regulation, Bishakha Shrestha

Chemistry & Biochemistry Dissertations - Archive

Homeobox gene (HOX) genes are evolutionary conserved genes that play important roles in cell differentiation, cell proliferation and embryogenesis. HOX genes bind to the DNA via their homeodomain and act as transcription factors. Of the 39 HOX genes present in human, HOXB9 is known to be a critical player in skeletal and mammary gland development. HOXB9 also regulates renin gene expression which is a critical player in Renin-Angiotensin system. Recent studies also demonstrate that HOXB9 is critical for angiogenesis. I have investigated transcriptional regulation of HOXB9 and its potential biochemical function during cell cycle progression and tumorigenesis. My studies demonstrate …

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Solid State Light Source Based Analytical Measurement Systems For Atmospheric Particles, Shilpa Rashinkar Jan 2011

Solid State Light Source Based Analytical Measurement Systems For Atmospheric Particles, Shilpa Rashinkar

Chemistry & Biochemistry Theses - Archive

Solid-state light sources such as light-emitting diodes, use a solid semiconductor block instead of a conventional heated filament or discharge source. Such light sources are preferred in analytical instrumentation because of various environmental benefits, cost benefits and most importantly performance benefits due to their characteristic features. This thesis deals with the fabrication of solid-state light source based analytical instrumentation for measuring size distribution and spectral absorption characteristics of ambient aerosol particles and provides insights into the behavior of aerosol organic carbon concentrations determined in a continuous and automated manner. Various analytical instruments are commercially available for either measuring the particle …

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A Diffusionless Transformation Path Relating Th₃P₄ And Spinel Structure Opportunities To Synthesize Ceramic Materials At High Pressures, Arindom Goswami Jan 2011

A Diffusionless Transformation Path Relating Th₃P₄ And Spinel Structure Opportunities To Synthesize Ceramic Materials At High Pressures, Arindom Goswami

Chemistry & Biochemistry Theses - Archive

Physical properties of solids at high pressure hold the key to many interesting questions in earth and planetary sciences, as well as in applied sciences. At high pressure, most ambient-pressure materials become unstable and transform into new and denser phases. In recent years, many solids with new structure types have been realized at high pressure through experiments and predicted in numerical simulations. Some of these structures are novel and had not been seen at ambient pressure. Some possess a variety of electronic states, i.e., metallic, superconducting, or super-hard states [YAO08]. These discoveries are of high interests both for their potential …

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Bismuth-Based Oxide Semiconductors: Mild Synthesis And Practical Applications, Hari Krishna Timmaji Jan 2011

Bismuth-Based Oxide Semiconductors: Mild Synthesis And Practical Applications, Hari Krishna Timmaji

Earth & Environmental Sciences Dissertations - Archive

In this dissertation study, bismuth based oxide semiconductors were prepared using 'mild' synthesis techniques - electrodepostion and solution combustion synthesis. Potential environmental remediation and solar energy applications of the prepared oxides were evaluated. Bismuth vanadate (BiVO₄) was prepared by electrodeposition and solution combustion synthesis. A two step electrosynthesis strategy was developed and demonstrated for the first time. In the first step, a Bi film was first electrodeposited on a Pt substrate from an acidic BiCl₃ medium. Then, this film was anodically stripped in a medium containing hydrolyzed vanadium precursor, to generate Bi3+, and subsequent BiVO₄ formation by in situ precipitation. …

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Identifying Possible Hydrologic Recharge Zones In The Sangre De Cristo Aquifer On The Milliken Ranch In Las Vegas, Nm, Ian Hamilton Jan 2011

Identifying Possible Hydrologic Recharge Zones In The Sangre De Cristo Aquifer On The Milliken Ranch In Las Vegas, Nm, Ian Hamilton

Earth & Environmental Sciences Theses - Archive

Groundwater at the periphery of mountain ranges in the desert southwest has its provenance in two possible sources: local or regional flow. This study sought to identify the source of deep groundwater from wells on ranches in the Hogback area west of Las Vegas, NM, an area under scrutiny as a possible source for municipal use. Surface and groundwater samples were taken in the area and analyzed for water chemistry and stable isotope ratios of deuterium and oxygen-18. Ratio values were plotted against the Global Meteoric Water Line (GMWL) and also plotted on an interpolated map of precipitation values for …

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High Order Compact Scheme For Discontinuous Differential Equations, James Louis Thompson Jan 2011

High Order Compact Scheme For Discontinuous Differential Equations, James Louis Thompson

Mathematics Dissertations - Archive

A high order implicit second derivative compact method is given which is similar the Adams-Moulton method, but requiring only two steps for sixth order. This method is used in both predictor-corrector and Newton's method formulations, and although the compact scheme is not A-stable or stiffly stable, it's region of stability is over six times greater than the Sixth order Adams-Moulton method. This compact method has a small truncation error coefficient, and is more accurate than Enright's method within the region of stability. Fourth and sixth order explicit compact methods are derived as well, and the three step sixth order explicit …

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A Computational Framework For Human-Centered Multimodal Data Analysis, Vangelis Metsis Jan 2011

A Computational Framework For Human-Centered Multimodal Data Analysis, Vangelis Metsis

Computer Science and Engineering Dissertations - Archive

Human-Centered computing defines a field of study in which computational processes affect the human being, either through ubiquitous and pervasive use of devices or any effect that improves the human condition. Human-Centered Computing applications face serious challenges in the handling of data collection, modeling, and analysis. Traditionally, the analysis of different aspects of human well-being derives from a variety of non-interrelated methods which has made it difficult to correlate and compare the different experimental findings for an accurate assessment of the contributing factors.This dissertation describes new algorithms that enable more accurate and efficient multimodal data analysis of Human-Centered computing applications …

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A Holistic, Similarity-Based Approach For Personalized Ranking In Web Databases, Aditya Telang Jan 2011

A Holistic, Similarity-Based Approach For Personalized Ranking In Web Databases, Aditya Telang

Computer Science and Engineering Dissertations - Archive

With the advent of the Web, the notion of ``information retrieval'' has acquired a completely new connotation and currently encompasses several disciplines ranging from traditional forms of text and data retrieval in unstructured and structured repositories to retrieval of static and dynamic information from the contents of the surface and deep Web. From the point of view of the end user, a common thread that binds all these areas is to support appropriate alternatives for allowing users to specify their intent (i.e., the user input) and displaying the resulting output ranked in an order relevant to the users. In the …

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Efficient Exploration Techniques On Large Databases, Senjuti Basu Roy Jan 2011

Efficient Exploration Techniques On Large Databases, Senjuti Basu Roy

Computer Science and Engineering Dissertations - Archive

Search, retrieval, and exploration of information have become some of the most intense and principal research challenges in many enterprize and e-commerce applications off late. The mainstay of this dissertation is to analyze and investigate different aspects of online data exploration, and propose techniques to accomplish them efficiently. In particular, the results in this dissertation widen the scope of existing faceted search and recommendation systems - two upcoming fields in data exploration which are still in their infancy. Faceted search, the de facto standard for e-commerce applications, is an interface framework with the primary design goal of allowing users to …

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The Synthesis, Optical Properties And Biological Applications Of Mn2+, Cu2+ And Ag+ Doped Zns Nanoparticles, Lun Ma Jan 2011

The Synthesis, Optical Properties And Biological Applications Of Mn2+, Cu2+ And Ag+ Doped Zns Nanoparticles, Lun Ma

Physics Dissertations - Archive

As a typical wide-band gap IIB-VI semiconductor, ZnS and ZnS based materials have been extensively studied and used in a variety of applications such as electroluminescence and cathodoluminescence displays, solar cells, and other optoelectronic devices. The most attractive feature of ZnS is its ability to be doped with most transition and/or rare earth metal ions, which allows a wide range of tunable electronic and optical properties. The nanosized ZnS based particles perform unique physical and chemical properties that dramatically differ from their bulk materials due to quantum size confinement. In this dissertation, Mn2+, Cu2+ and Ag+ doped ZnS water soluble …

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Fundamental Dynamical Equations For Two And Four-Component Spinors In Galilean And Minkowski Space-Time, Randal Huegele Jan 2011

Fundamental Dynamical Equations For Two And Four-Component Spinors In Galilean And Minkowski Space-Time, Randal Huegele

Physics Dissertations - Archive

A search for new fundamental (Galilean and Poincaré invariant) dynamical equations for free elementary particles represented by spinor state functions is conducted in Galilean and Minkowski space-time. A dynamical equation is considered as fundamental if it is invariant under the symmetry operations of the group of the spacetime metric and if its state functions transform like the irreducible representations of the group of the metric. It is shown that there are no Galilean invariant equations for two-component spinor wave functions thus the Pauli equation is not fundamental. It is formally proved that the Lévy-Leblond and Schrö̈dinger equations are the only …

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A Mathematical Model For Swine Flu 2009 With Vaccination, Irfan Turk Jan 2011

A Mathematical Model For Swine Flu 2009 With Vaccination, Irfan Turk

Mathematics Theses - Archive

H1N1 influenza is one of the deadliest diseases in human's history. Swine Flu 2009 is the same virus and it was named in 2009. Vaccination is of the most common ways to control a disease. We offer a new vaccination model with recommendations from the US Centers for Disease Control and Prevention (CDC). The entire population is divided into 4 different age groups: one group with no vaccination, one group with 2 doses of vaccination, and two groups with 1 dose of vaccination. We establish that higher levels of vaccination lead to greater savings of life. We also consider the …

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Generalized Reinforcement Learning With An Application In Generic Workload Management Systems, Po-Hsiang Chiu Jan 2011

Generalized Reinforcement Learning With An Application In Generic Workload Management Systems, Po-Hsiang Chiu

Computer Science and Engineering Dissertations - Archive

Learning by trial and error and being able to form levels of abstraction from the past experience has been an important factor for sentient beings to develop intelligent behaviors and cope with an ever-changing environment. Complex control domains, in a similar way, often require the interacting agents to learn adaptive control strategies for time-varying or potentially evolving systems. This dissertation will begin by investigating an example of complex domains, Grid computing networks, through a collaborative effort in the design and implementation of a generic workload management system, PanDA-PF WMS used in the ATLAS experiment. With the incentive of boosting the …

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Delay Tolerant Lazy Release Consistency For Distributed Shared Memory In Opportunistic Networks, Chance Ray Eary Jan 2011

Delay Tolerant Lazy Release Consistency For Distributed Shared Memory In Opportunistic Networks, Chance Ray Eary

Computer Science and Engineering Theses - Archive

Opportunistic networking (ON), a concept which allows a mobile wireless device to dynamically interact with other wireless devices in its immediate vicinity, is a field with great potential to improve the utility of itinerant computational platforms. While ONs increase a device's ability to interact with its peers, the fleeting and intermittent connections between devices make many traditional computer collaboration paradigms, such as distributed shared memory (DSM), virtually untenable. DSM systems, developed for traditional networks, rely on relatively stable, consistent connections among participating nodes. In an ON, connectivity among nodes is distributed in time and space making it useful for delay …

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Sybil Defense For Online Social Networks Using Partial Graph Information, Vritant Naresh Jain Jan 2011

Sybil Defense For Online Social Networks Using Partial Graph Information, Vritant Naresh Jain

Computer Science and Engineering Theses - Archive

Online social networks (OSNs) today are proprietary, in the sense that communication between users requires the users to be part of the same OSN. This raises privacy issues and reliability concerns among users, and calls for an open, interoperable, and distributed OSN infrastructure that is similar to email and would link different OSNs together. Any decentralized system, however, is vulnerable to Sybil attacks, in which an attacker claims multiple identities, called Sybils, to overwhelm the OSNs and defeat standard techniques used to protect against attacks such as message spam. The state of the art defense against these attacks is SybilInfer, …

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Performance Tuning Of An Embedded Template Analysis Tool, Ashwin Arikere Jan 2011

Performance Tuning Of An Embedded Template Analysis Tool, Ashwin Arikere

Computer Science and Engineering Theses - Archive

As multi core processors become ubiquitous, programs must be designed to utilize the additional power at their disposal. Extracting maximum performance out of these processors requires utilizing latest parallel programming techniques as well as using the latest tools available to increase performance. This thesis delves into enhancing performance of existing programs by applying parallel techniques, utilizing performance analyzers and various other tools developed specially for multi-core system programming. We discuss these techniques and tools and also demonstrate how a Template Analysis program was modified to take advantage of the additional power a multi-core machine has over single core machines to …

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Automatic Discovery Of Significant Events From Databases, Avinash Shankar Bharadwaj Jan 2011

Automatic Discovery Of Significant Events From Databases, Avinash Shankar Bharadwaj

Computer Science and Engineering Theses - Archive

The advent of the internet has caused enormous amounts of data available online causing many significant facts to be hidden within this data. Searching for a significant fact within these large datasets is a query intensive process involving large amounts of queries which needs to be executed hence slowing the process of finding the significant facts from a large dataset. In this thesis, a novel approach has been designed exploiting the mathematical characteristics of the data present in the dataset to reduce the number of queries on the dataset. A two phased approach is considered for making fact finding more …

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Capillary Electrophoresis Separation Of Neutral Organic Compounds, Pharmaceutical Drugs, Enantiomers And Anions, Qing Feng Jan 2011

Capillary Electrophoresis Separation Of Neutral Organic Compounds, Pharmaceutical Drugs, Enantiomers And Anions, Qing Feng

Chemistry & Biochemistry Theses - Archive

The focus of this thesis is on using capillary electrophoresis (CE) with on-column UV detection in achiral and chiral separations. Chapter 1 provides a brief introduction to the principle, mechanism, meaning and application of the CE method. Chapter 2 presents the CE separation of multivalent anions by using di- and tetracationic ion pairing reagents. Two newly developed UV transparent phosphonium-based cationic reagents were evaluated as additivesto the background electrolyte of CE for the separation of multiply charged anions, including several complex anions. These cationic reagents showed moderate suppression of the electroosmotic flow (EOF), interacted with the analytes to improve their …

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Some Problems Of Integral Geometry In Advanced Imaging, Rim Gouia Jan 2011

Some Problems Of Integral Geometry In Advanced Imaging, Rim Gouia

Mathematics Dissertations - Archive

During the past decade, our society has become dependent on advanced mathematics for many of our daily needs. Mathematics is at the heart of the 21st century technologies and more specifically the emerging imaging technologies from thermoacoustic tomography (TAT) and ultrasound computed tomography (UCT) to non-destructive testing (NDT). All of these applications reconstruct the internal structure of an object from external measurements without damaging the entity under investigation. The basic mathematical idea common to such reconstruction problems is often based upon Radon integral transform.The Radon integral transform Rf puts into correspondence to agiven function f its integrals over certain subsets. …

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Climate Reconstruction Using Trace Element And Stable Isotope Signatures Preserved In An Early Late Pleistocene Stalagmite From Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, Usa, Ashley Rachelle Wright Jan 2011

Climate Reconstruction Using Trace Element And Stable Isotope Signatures Preserved In An Early Late Pleistocene Stalagmite From Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, Usa, Ashley Rachelle Wright

Earth & Environmental Sciences Theses - Archive

An early-Late Pleistocene stalagmite was recovered from Buckeye Creek Cave (37°58.57'N, 80°23.98'W), southeastern West Virginia, USA. The growth axis of stalagmite BCC-025 was sampled for δ18O, δ13C, and Sr/Ca of the calcite. A crude age model was developed using two Th-230 ages, from the top (~490 kyrBP) and bottom (~630 kyrBP) of the stalagmite. A more elaborate age model for stalagmite growth was developed using established marine isotope stage (MIS 13/14, 14/15, 15/16) boundaries. Overall, the MIS boundaries approximate the locations of major hiatuses along the axis of stalagmite growth. The proxy records developed from BCC-025 reveal less covariation and …

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On The Existence Of Totally Reflexive Modules, Kristen Ann Beck Jan 2011

On The Existence Of Totally Reflexive Modules, Kristen Ann Beck

Mathematics Dissertations - Archive

In this manuscript, we investigate the existence of non-free totally reflexive modules over two classes of commutative local (Noetherian) rings.First, we demonstrate existence over a class of local rings which are defined by a Gorenstein homomorphism. Among the corollaries to this result, we recover a theorem of Avramov, Gasharov, and Peeva (1997) concerning the existence of non-free totally reflexive modules over local rings with embedded deformations. We also give a general construction for a class of local rings which satisfy the hypotheses of our theorem, and we show it is able to produce rings without embedded deformations.The second focus of …

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Chemostratigraphy And Paleoenvironment Of The Smithwick Formation, Fort Worth Basin, San Saba County, Texas, Elisha Nichole Hughes Jan 2011

Chemostratigraphy And Paleoenvironment Of The Smithwick Formation, Fort Worth Basin, San Saba County, Texas, Elisha Nichole Hughes

Earth & Environmental Sciences Theses - Archive

The Early Pennsylvanian-Age Smithwick Formation was deposited in the tectonically active Fort Worth Basin in North Central Texas during a time of well-documented global climatic instability during the Late Paleozoic ice age. Geochemical and stable isotopic results from two cores recovered from the southwestern portion of the FWB provide paleoenvironmental insight into the conditions under which the Smithwick was deposited. Specifically, major element geochemistry and mineralogical results suggest a depositional setting grading from a carbonate-rich facies (Marble Falls and Big Saline) into a transgressive siliciclastic-dominated mudrock (Smithwick) that coarsens upward into a progradational mudrock and silt/sand sequence (Atoka and Strawn). …

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Chemostratigraphy And The Paleoceanography Of The Bossier-Haynesville Formation, East Texas Basin, Texas And La, Usa, Pukar Mainali Jan 2011

Chemostratigraphy And The Paleoceanography Of The Bossier-Haynesville Formation, East Texas Basin, Texas And La, Usa, Pukar Mainali

Earth & Environmental Sciences Theses - Archive

The fine-grained, dark, organic, calcareous Haynesville shale (Kimmeridgian), and the overlying carbonate-poor Bossier shale (Tithonian) was deposited during the warmer Jurassic period in the tectonically formed East Texas Basin. Thirteen drill cores recovered from six counties (Texas) and four parishes (Louisiana) have been studied for their geochemistry. Each core was analyzed at a 1-foot interval using a handheld x-ray fluorescence instrument, providing rapid, quantitative analysis of the following elemental concentrations: Mg, Al, S, Si, P, K, Ti, Ca, Mn, Fe, Mo, Cr, Ni, Cu, Zn, Th, Rb, U, Sr, Zr, and V. In addition, XRD analyses (10 samples from T.W. …

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Regular Algebras Related To Regular Graded Skew Clifford Algebras Of Low Global Dimension, Manizheh Nafari Jan 2011

Regular Algebras Related To Regular Graded Skew Clifford Algebras Of Low Global Dimension, Manizheh Nafari

Mathematics Dissertations - Archive

M. Artin, W. Schelter, J. Tate, and M. Van den Bergh introduced the notion of non-commutative regular algebras, and classified regular algebras of global dimension 3 on degree-one generators by using geometry (i.e., point schemes) in the late 1980s. Recently, T. Cassidy and M. Vancliff generalized the notion of a graded Clifford algebra and called it a graded skew Clifford algebra.In this thesis, we prove that all classes of quadratic regular algebras of global dimension 3 contain graded skew Clifford algebras or Ore extensions of graded skew Clifford algebras of global dimension 2. We also prove that some regular algebras …

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