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Articles 1951 - 1980 of 2429

Full-Text Articles in Physical Sciences and Mathematics

Geochemistry Of Molybdenum In The Aquia Aquifer, Maryland, Usa, Teresa Iafelice Valle Jan 2009

Geochemistry Of Molybdenum In The Aquia Aquifer, Maryland, Usa, Teresa Iafelice Valle

Earth & Environmental Sciences Theses - Archive

The present study contributes to the understanding of controls on and behavior of molybdenum (Mo) in an aquifer, and its potential as an indicator of changing redox conditions along the groundwater flowpath. The central hypothesis of the present work is that the hydrogeochemical evolution along two separate groundwater flowpaths of the Aquia Aquifer, Maryland, USA, one each on the Eastern and Western Shore of Chesapeake Bay, consists of chemical weathering and oxidation-reduction reactions that dictate the degree of Mo mobilization, as well as mineral co-precipitation/re-adsorption reactions that dictate the degree of Mo immobilization (i.e., scavenging). This hypothesis is evaluated by …

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Logistic Regression With Misclassified Covariates Using Auxiliary Data, Nathan N. Dong Jan 2009

Logistic Regression With Misclassified Covariates Using Auxiliary Data, Nathan N. Dong

Mathematics Dissertations - Archive

When standard regression methods are used, measurement errors cause a bias in parameters estimation. In dealing with discrete covariates, such measurement errors are known as misclassification and the corresponding discrete covariate is said to be misclassified. Even though the collected data may not be fully reliable, it may be possible to collect some sub-data with full precision called auxiliary data and the remaining data called primary data may contain misclassification. In this paper, in order to improve predictions from the primary data with misclassification, we propose a method based on the maximum likelihood approach; by using the prediction with auxiliary …

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Removal Of Butylene And Propylene Gas Using Biofiltration, Madhu Rani Jan 2009

Removal Of Butylene And Propylene Gas Using Biofiltration, Madhu Rani

Earth & Environmental Sciences Theses - Archive

Air pollutants are produced from a variety of anthropogenic activities such as food production, wastewater treatment plants, painting, industrial activities, and biomass combustion. Such pollutants are becoming a cause of concern worldwide because of their harmful effects on ecosystems, human health, and the atmosphere. One technology for treatment of these hazardous, odorous, and ozone-forming compounds is biofiltration. Biofilters are relatively inexpensive to install and operate, and can achieve high pollution removal efficiencies. This research was carried out to determine the removal efficiency of pollutants propylene and butylene using biofilter technology. In a biofilter column, air is passed through a packed …

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Optimal Control Approach To Image Registration, Stephen Taiwo Salako Jan 2009

Optimal Control Approach To Image Registration, Stephen Taiwo Salako

Mathematics Dissertations - Archive

The purpose of this dissertation is twofold: To present a new method of orthogonal grid generation and to investigate certain theoretical aspects of the optimal control approach to the image registration problem.In the first part of this dissertation, we will present a variational method of orthogonal grid generation which is based on the deformation method and solving Euler-Lagrange equations. Although the concept of grid generation has been studied extensively, the generation of orthogonal grids is still one of the most challenging problems of the grid generation methods.An orthogonal grid should offer significant advantages in the solution of systems of partial …

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An Integrated Framework For Qos-Aware Data Reporting In Wireless Sensor Networks, Hyun Jung Choe Jan 2009

An Integrated Framework For Qos-Aware Data Reporting In Wireless Sensor Networks, Hyun Jung Choe

Computer Science and Engineering Dissertations - Archive

Wireless sensor networks are being deployed in a wide variety of applications such as environment monitoring, smart buildings, security, machine surveillance system, and so on.The deployment of sensor networks for a specific sensing application enhances the ability to control and examine the physical environments while collecting meaningful information from the monitoring area.In densely deployed networks, the sensor nodes located in an adjacent area detect the targeted phenomena in its sensing range and report the gathered (raw or processed) data to designated sinks via single-hop or multi-hop communication paths.Although the correlation of data from proximity sensors cause overheads in terms of …

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Studies Of Enantiomeric Separations Using Capillary Electrophoresis, Man-Yung Benjamin Tong Jan 2009

Studies Of Enantiomeric Separations Using Capillary Electrophoresis, Man-Yung Benjamin Tong

Chemistry & Biochemistry Theses - Archive

The focus of this thesis is on using state-of-the-art capillary electrophoresis (CE) in enantiomeric separations. Chapter 1 provides a brief introduction to enantiomeric separations using CE. Chapters 2 through 5 presents the use of different novel chiral selectors in CE. The selector properties and strategies for developing on enantiomeric separations are considered. Chapter 2 presents an overview on the most broadly useful chiral selectors for CE enantiomeric separations, sulfated cyclodextrins. Chapter 3 presents a new chiral selector, sodium arsenyl L-(+) tartrate. This chiral selector shows enantioselectivity for many amine-containing compounds and ruthenium (II) polypyridyl complexes and produces electropherograms with short …

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Room Maps & Benchmark Problems, Nathan R. Sturtevant Jan 2009

Room Maps & Benchmark Problems, Nathan R. Sturtevant

Moving AI Lab: 2D Maps and Benchmark Problems

Contains 40 maps of size 512x512 and problem sets. Maps are divided into rooms of size 8x8, 16x16, 32x32, and 64x64. There are 10 maps and problem sets for each room size. Maps with differing room sizes are not scaled: thickness of walls and passages differs.

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Random Obstacle Maps & Benchmark Problems, Nathan R. Sturtevant Jan 2009

Random Obstacle Maps & Benchmark Problems, Nathan R. Sturtevant

Moving AI Lab: 2D Maps and Benchmark Problems

Contains 70 maps of size 512x512 and benchmark problem sets. These maps are algorithm-generated by blocking grid cells. Maps contain 10%, 15%, 20%, 25%, 30%, 35%, or 40% blocked cells. There are 10 maps and problem sets for each percentage.

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Autonomous Abstraction Of Policies Based On Policy Homomorphism, Srividhya Rajendran Jan 2009

Autonomous Abstraction Of Policies Based On Policy Homomorphism, Srividhya Rajendran

Computer Science and Engineering Dissertations - Archive

A life long learning agent performing in a complex and dynamic environment needs the ability to learn increasingly complex tasks over time. These agents over their lifetime have to learn new tasks, adapt the policies of already learned tasks and extract and reuse the knowledge gained to learn new, more complex tasks. To do this, they need methods that allow them to autonomously extract knowledge from the already learned policy instances and reuse the knowledge gained to learn related tasks in novel environments.This dissertation presents a novel approach that enables an agent to autonomously abstract reusable skills and concepts using …

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Scorpionate Supported And Unsupported Carbonyl And Ethylene Complexes Of Group 11 Metals, Mauro Fianchini Jan 2009

Scorpionate Supported And Unsupported Carbonyl And Ethylene Complexes Of Group 11 Metals, Mauro Fianchini

Chemistry & Biochemistry Dissertations - Archive

Carbon monoxide (CO) and small olefins represent perhaps the simplest, but most important ligand systems in coordination/organometallic chemistry. Simple carbonyl and ethylene compounds have started to appear in the field since the early nineteen century. Due to their peculiar electronic properties, strong bonds to late transition metal cations such as Cu¹, Ag¹, and Au¹ are generally discouraged. However, intermediates involving M-CO or M-olefin (where M = Cu¹, Ag¹, Au¹) have been claimed to be key-steps in reactions and industrial processes involving coinage metals. Unfortunately, experimental data on coinage metal complexes with CO and olefins are scarce due to the difficulty …

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Enantiomeric Separations And New Chiral Stationary Phases, Chunlei Wang Jan 2009

Enantiomeric Separations And New Chiral Stationary Phases, Chunlei Wang

Chemistry & Biochemistry Dissertations - Archive

Chirality is an important concern for biological activity because asymmetry dominates biological processes at a molecular level. After nearly thirty years of development, liquid chromatographic separations on chiral stationary phases (CSPs) have become the state-of-art technology for resolution of enanantiomeric compounds. However, with the trend in the pharmaceutical industry to replace racemate drugs with their single enantiomer forms, chiral methods are in ever increasing demand. The efficient development of enantiomeric separation methods is still challenging and time consuming. In this thesis, we present new approaches for the enantiomeric separation of two important pharmaceutical compounds, the development of three new CSPs, …

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Development Of New Chiral Selectors For Liquid Chromatography And Their Performance Relative To Established Chiral Stationary Phases (Csps), Ping Sun Jan 2009

Development Of New Chiral Selectors For Liquid Chromatography And Their Performance Relative To Established Chiral Stationary Phases (Csps), Ping Sun

Chemistry & Biochemistry Dissertations - Archive

HPLC with chiral stationary phases (CSPs) has proven to be the most widely applicable and versatile technique for enantiomeric separations. This dissertation discusses new research in three important areas of enantiomeric separations: HPLC method developments for target chiral analytes using the existing CSPs, mechanistic investigations by NMR, and development of new HPLC CSPs. Two classes of commercial chiral stationary phases (cyclodextrin-type and macrocyclic glycopeptide-type) were evaluated by separating specific groups of chiral analytes, including β-lactam compounds and ruthenium(II) polypyridyl complexes. The effects of chiral selector structures, mobile phase compositions, and analyte structures have been examined. For Ru(II) complexes, the newly …

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Autonomic Trust Management In Dynamic Systems, Brent Lagesse Jan 2009

Autonomic Trust Management In Dynamic Systems, Brent Lagesse

Computer Science and Engineering Dissertations - Archive

Research in pervasive computing is aimed at creating environments where users can seamlessly benefit from ubiquitous computing resources despite the complexity of the environment. Providing security in such systems is a difficult task since traditional security mechanisms often require significant user attention and do not scale well to large, mobile, and open environments. To combat this problem, distributed trust has been proposed to provide security in pervasive systems. While much research has been performed in the area, many vulnerabilities and insufficiencies still exist, especially in mobile ad-hoc systems that cannot support distributed trust mechanisms requiring pre-existing infrastructure and cooperation. Dynamic …

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Propagation And Generation Of Waves In Solar Atmosphere, Swati Routh Jan 2009

Propagation And Generation Of Waves In Solar Atmosphere, Swati Routh

Physics Dissertations - Archive

The fact that the temperature increases with height in the solar atmosphere has been known for many years. To maintain this temperature increase, sources of heating must be present in the atmosphere. One of the most important, and still unsolved, problems in solar physics is to identify the basic physical processes that are responsible for this heating, and explain solar activities caused by the heating. It is also observationally well-established that the solar atmosphere shows a broad range of oscillations that are different in magnetic and non-magnetic regions of the atmosphere.The oscillations are driven by propagating waves, which cause the …

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Theoretical Study Of Electronic Properties Of The Cu(001) Surface Under Conditions Of High Coverage Oxidation, Willie Burton Maddox Jan 2009

Theoretical Study Of Electronic Properties Of The Cu(001) Surface Under Conditions Of High Coverage Oxidation, Willie Burton Maddox

Physics Theses - Archive

The study of adsorption of oxygen on transition metal surface is important for the understanding of oxidation, heterogeneous catalysis, and metal corrosion. The structures formed on oxidized transition metal surfaces vary from simple adlayers of chemisorbed oxygen to more complex structures which result from the diffusion of oxygen into sub-surface regions. In this thesis, an textit{ab-initio} investigation of stability and associated physical and electronic properties of different adsorption phases of oxygen on Cu(001) as well as of the clean Cu surfaces using density functional theory in the generalized gradient approximation, is presented. All surface geometries are fully optimized. Results of …

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Analysis And Simulation In Neuron And Fibrosis Models, Humberto D. Perez Gonzalez Jan 2009

Analysis And Simulation In Neuron And Fibrosis Models, Humberto D. Perez Gonzalez

Mathematics Dissertations - Archive

In this work, we use analysis and numerical simulations to study the change of collective behaviorof two synaptically coupled square bursting systems, the effect of noise inan elliptic bursting system and foreign body reactions.For the square bursters we study its synchronization process as the strength ofcoupling increases. The two cells present chaotic bursting behaviorwhen there is no coupling. As the strength increases and past a certain value,the behavior of two cells, which are uncoupled, becomes synchronized regular burstingmotions. For the elliptic bursting phenomenon we study the distribution of the noise and its effects in the dynamics and the reliability of …

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Testing The Equality Of Regression Coefficients And A Pooling Methodology From Multiple Samples When The Data Is Multicollinear, Fransell Riley Jan 2009

Testing The Equality Of Regression Coefficients And A Pooling Methodology From Multiple Samples When The Data Is Multicollinear, Fransell Riley

Mathematics Dissertations - Archive

Testing the equality of regression coefficients between two regression equations is a common practice in statistics today. The theory and methods are sufficiently developed under ordinary least squares (OLS) estimation. However, there is no method for conducting such tests when OLS estimation is not an appropriate method. For example, when multicollinearity exists in the data.Therefore, there is a need for a method to test the equality of regression coefficients when the data is multicollinear. In this research, we will present methods for conducting such a test using ridge regression coefficient estimators and principal component estimators. We will also present a …

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A Globally Convergent Numerical Method For Coefficient Inverse Problems, Natee Pantong Jan 2009

A Globally Convergent Numerical Method For Coefficient Inverse Problems, Natee Pantong

Mathematics Dissertations - Archive

In our terminology "globally convergent numerical method" means a numerical method, whose convergence to a good approximation for the correct solution is independent of the initial approximation. A new numerical imaging algorithm of reconstruction of optical absorption coefficients from near infrared light data with a continuous-wave has been purposed to solves a coefficient inverse problem for an elliptic equation with the data generated by the source running along a straight line. A regularization process, so-called "exterior forward problem", for preprocessing data with noise on the boundary has also been purpose for the problem related to matching fluid in experiment. A …

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Adaptive Nonparametric Distribution-Free Procedures In Factorial Data Analysis, Richard Nzagong Ferim Jan 2009

Adaptive Nonparametric Distribution-Free Procedures In Factorial Data Analysis, Richard Nzagong Ferim

Mathematics Dissertations - Archive

Many statisticians have questioned the basic assumptions about underlying models which might dominate the analysis of the data in many cases. The assumption of normality without much thought is of concern to a growing group of statisticians. If wrongly assumed, the assumption of normality can lead in serious flaws in the analysis of data. It therefore becomes important to consider distribution-free procedures that don't have to rely on the normality assumption. This is where the adaptive procedures come into play. When data is skewed or light tailed, these adaptive methods produce better results than the regular Wilcoxon and parametric methods. …

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Simulations Of High-Latitude Ionosphere-Magnetosphere Region Plasma Density Structures And The AlfvéN Waves Effects, Fajer Bitar Jaafari Jan 2009

Simulations Of High-Latitude Ionosphere-Magnetosphere Region Plasma Density Structures And The AlfvéN Waves Effects, Fajer Bitar Jaafari

Physics Dissertations - Archive

O+ density structures in the polar cap ionosphere-magnetosphere region near 6000 km altitude have been observed with numerous spacecraft, with O+ densities ranging from above 10 cm-3 to lower than 0.01 cm-3. Regions with densities in the low range have been referred to as O+ density troughs [Zeng et al., 2004], or ion depletion zones [Horita et al., 1993]. Regions with high O+ densities are likely caused by processes such as soft auroral electron precipitation and transverse wave heating. In this simulation work, we use the UT Arlington Dynamic Fluid-Kinetic (DyFK) ionospheric plasma transport model to model O+ density profiles …

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Moment Calculations For Low Energy Ions In Jupiter's Magnetotail From Nasa's New Horizons Mission, Debrup Hui Jan 2009

Moment Calculations For Low Energy Ions In Jupiter's Magnetotail From Nasa's New Horizons Mission, Debrup Hui

Physics Theses - Archive

Jupiter's magnetosphere and magnetotail is the largest cohesive structure in our solar system which extends to the orbit of Saturn. One of NASA's objectives is to understand how universal bodies interact with its surroundings. The New Horizons (NH) mission is the first satellite to traverse axially through the Jovian magnetotail and obtain in-situ data. The Solar Wind Around Pluto (SWAP) instrument onboard NH measured low energy ions from 35eV to 7.5 keV in the Jovian magnetotail during its fly-by. We analyzed SWAP data from 500-1750 Jovian radii (RJ) when the spacecraft was spinning. A 3D phase-space density fitting procedure was …

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Development And Characterization Of Gas Electron Multiplier Chambers For A Digital Hadron Calorimeter In The International Linear Collider, Jacob Russell Smith Jan 2009

Development And Characterization Of Gas Electron Multiplier Chambers For A Digital Hadron Calorimeter In The International Linear Collider, Jacob Russell Smith

Physics Theses - Archive

Gas Electron Multiplier, or GEM, technology provides an attractive option for high precision jet energy measurements for future high energy physics experiments at the International Linear Collider. High voltage settings and gas mixture ratios are determined to optimize double GEM chamber gain and efficiency performance. Electronics readout using QPAO2 chipset and the analog KPIX system developed by Stanford Linear Accelerator Center are used at different stages of the development and characterization of double GEM chambers. The results presented in this thesis are performed primarily at UTA using radioactive sources and cosmic ray particles but also include results from test beam …

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The Malina Oceanographic Expedition: How Do Changes In Ice Cover, Permafrost And Uv Radiation Impact On Biodiversity And Biogeochemical Fluxes In The Arctic Ocean?, Phillippe Massicotte, Rainer Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Bélanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaëlle Chaillou, Malik Malik, Bruno Charrière, Jing Chen, Hervé Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Et. Al. Jan 2009

The Malina Oceanographic Expedition: How Do Changes In Ice Cover, Permafrost And Uv Radiation Impact On Biodiversity And Biogeochemical Fluxes In The Arctic Ocean?, Phillippe Massicotte, Rainer Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Bélanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaëlle Chaillou, Malik Malik, Bruno Charrière, Jing Chen, Hervé Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Et. Al.

Faculty Publications

The MALINA oceanographic campaign was conducted during summer 2009 to investigate the carbon stocks and the processes controlling the carbon fluxes in the Mackenzie River estuary and the Beaufort Sea. During the campaign, an extensive suite of physical, chemical and biological variables was measured across seven shelf–basin transects (south-north) to capture the meridional gradient between the estuary and the open ocean. Key variables such as temperature, absolute salinity, radiance, irradiance, nutrient concentrations, chlorophyll-a concentration, bacteria, phytoplankton and zooplankton abundance and taxonomy, and carbon stocks and fluxes were routinely measured onboard the Canadian research icebreaker CCGS Amundsen and from a barge …

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Studies Of The Performance, Stability And Reliability Of Various Configurations Of The Activated Sludge Process At Full-Scale Municipal Wastewater Treatment Plants, Michael A. Redda Dec 2008

Studies Of The Performance, Stability And Reliability Of Various Configurations Of The Activated Sludge Process At Full-Scale Municipal Wastewater Treatment Plants, Michael A. Redda

Earth & Environmental Sciences Dissertations - Archive

This research presents a performance, stability and reliability analysis of five configurations of activated sludge process, viz., conventional, contact stabilization, complete mix, extended aeration and sequencing batch reactor. Five years effluent records of carbonaceous biochemical oxygen demand (CBOD5), total suspended solids (TSS) and ammonia nitrogen (NH3-N) were used. The impact of hydraulic load classes (HLCes) and seasons on the performance of configurations were also examined. The Univariate General Linear Model with Tukey's Honestly Significant Difference was employed in the performance and stability studies. Performance was determined based on the observed lowest mean effluent concentrations, while the observed standard deviation from …

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Side-Effects Of Pesticides On The Life Cycle Of The Mite Pathogenic Fungus Neozygites Floridana, V. W. Wekesa, M. Knapp, I. Delalibera Dec 2008

Side-Effects Of Pesticides On The Life Cycle Of The Mite Pathogenic Fungus Neozygites Floridana, V. W. Wekesa, M. Knapp, I. Delalibera

All Peer-Reviewed Publications

The tomato red spider mite, Tetranychus evansi Baker and Pritchard, is an invasive species in Africa causing considerable damage to Solanaceous crops. The fungal pathogen Neozygites floridana Weiser and Muma from Brazil has been considered a potential candidate for introduction into Africa for the control of T. evansi. To be incorporated in the tomato production system, N. floridana has to be compatible with the pesticides used for the control of other pests and diseases. Pesticides used in tomatoes that might affect the fungus were therefore studied by the use of different methods. Two insecticides (Lambda-cyhalothrin and Methomyl), two acaricides (Propargite …

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North Shore Bays Benthic Mapping: Groundtruth Studies Gis Data, Robert M. Cerrato, Lee Holt Nov 2008

North Shore Bays Benthic Mapping: Groundtruth Studies Gis Data, Robert M. Cerrato, Lee Holt

SoMAS Research Data

We combined high-resolution remote sensing techniques with detailed study of the physical and faunal characteristics at point locations in different seafloor environments within the Oyster Bay- Cold Spring Harbor Complex, the Huntington-Northport Bay Complex, and Port Jefferson Harbor, including Conscience Bay. High-resolution backscatter and bathymetric maps created by side scan and multibeam sonar surveys were used to classify the seabed into provinces. Samples for macrofauna and sediment properties were collected within each province to provide "ground truth" for the acoustic maps. Oyster Bay, Huntington Harbor, and Port Jefferson Harbor were sampled at 40, 38, and 50 locations, respectively, with two …

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Microtextural Constraints On The Interplay Between Fluidrockreactions And Deformation, Alexis K. Ault, Jane Selverstone Oct 2008

Microtextural Constraints On The Interplay Between Fluidrockreactions And Deformation, Alexis K. Ault, Jane Selverstone

Geosciences Faculty Publications

Schists from two mylonitic localities in the footwall of a low-angle normal fault in the eastern Alps record different degrees of embrittlement during exhumation, depending on the extent to which fluid–rock reactions proceeded. At one site, graphitic schists preserve textural evidence for two metamorphic reactions that modified XCO2XCO2 and/or fluid volume: (1) reaction between graphite and aqueous fluid that increased XCO2XCO2 without changing the molar amount of fluid, and (2) replacement of titanite by rutile, calcite, and quartz. The latter reaction involved net consumption of increasingly CO2-rich fluid. Areas where the first reaction proceeded are associated with abundant Mode I …

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Impacts Of Land Use, Anthropogenic Disturbance, And Harvesting On An African Medicinal Liana, Lauren Mcgeoch, Ian Gordon, Johanna Schmitt Sep 2008

Impacts Of Land Use, Anthropogenic Disturbance, And Harvesting On An African Medicinal Liana, Lauren Mcgeoch, Ian Gordon, Johanna Schmitt

All Peer-Reviewed Publications

African medicinal plant species are increasingly threatened by overexploitation and habitat loss, but little is known about the conservation status and ecology of many medicinal species. Mondia whitei (Apocynaceae, formerly Asclepiadaceae), a medicinal liana found in Sub-Saharan Africa, has been subject to intensive harvesting and habitat loss. We surveyed M. whitei in Kakamega Forest, the largest of three remnant Kenyan forests known to contain the species. In 174 100 m2 plots, we quantified the status of M. whitei and investigated its relationships with land use, disturbance and harvesting. With average adult densities of 101 plants/ha, M. whitei is not locally …

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National Clean Energy Summit Closing Remarks Keynote, Michael Bloomberg Aug 2008

National Clean Energy Summit Closing Remarks Keynote, Michael Bloomberg

National Clean Energy Summit

Closing remarks

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Panel Iv: The Visible Hand: Government's Role In The Clean Energy Transformation: Opportunities To Accelerate Deployment Of Energy Efficiency And Renewable Energy, Bill Ritter, Jon Wellinghoff, Steven Chu, David Overskei, Jim Thomas Aug 2008

Panel Iv: The Visible Hand: Government's Role In The Clean Energy Transformation: Opportunities To Accelerate Deployment Of Energy Efficiency And Renewable Energy, Bill Ritter, Jon Wellinghoff, Steven Chu, David Overskei, Jim Thomas

National Clean Energy Summit

Panel discussion Moderator: John Podesta, President and CEO, Center for American Progress Action Fund

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