Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2004

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 211 - 240 of 22772

Full-Text Articles in Entire DC Network

Secondary Municipal Wastewater Treatment Using The Uasb/Solids Contact Technology, Eudomar Silva Dec 2004

Secondary Municipal Wastewater Treatment Using The Uasb/Solids Contact Technology, Eudomar Silva

LSU New Orleans Theses and Dissertations

Anaerobic pretreatment and aerobic post-treatment of municipal wastewater is being used more frequently. Recent investigations in this field using an AFBR/aeration chamber combination demonstrated the technical feasibility of this process. The investigation presented herein describes the use of a combined UASB/aeration chamber system for the treatment of municipal wastewater and attempts to demonstrate the technical feasibility of using the UASB process as both a pretreatment unit and a waste activated sludge digestion system. The results indicate that the UASB reactor has a TSS removal efficiency of about 37%. Of the solids removed by the unit, 33% were degraded by the …

Go to article

A Novel Chirp Slope Keying Modulation Scheme For Underwater Communication, Lastri Simanjuntak Dec 2004

A Novel Chirp Slope Keying Modulation Scheme For Underwater Communication, Lastri Simanjuntak

LSU New Orleans Theses and Dissertations

A digital modulation method using Chirp-Slope Keying (CSK) is developed for coherent underwater acoustic communications. Effective signal detection is a critical stage in the implementation of any communications system; we will see that CSK solves some significant challenges to reliable detection. This thesis is primarily based on analyzing the effectiveness of CSK through simulations using Matlab's Simulink for underwater communications. The procedure begins with modulating a chirp's slope by random binary data with a linear-down-slope chirp representing a 0, and a linear-up-slope chirp representing a 1. Each received symbol is demodulated by multiplying it with the exact linear-up-slope chirp and …

Go to article

Employee Satisfaction And Performance: A Study Of The Rc Hotel Company Kitchen Environment, Melissa Bradberry Sims Dec 2004

Employee Satisfaction And Performance: A Study Of The Rc Hotel Company Kitchen Environment, Melissa Bradberry Sims

LSU New Orleans Theses and Dissertations

Employee satisfaction and performance are a major determinant of the corporate culture of a property. Discussion of whether or not this statement is true within the kitchens of The Ritz Carlton Hotel in New Orleans is the basis for this study. By using the corporate mandated tools (the annual employee satisfaction survey and the employee performance appraisals) the determination of this question was confirmed. However, there were some great concerns about the validity of the two tools. The tools showed a definite relationship between the employee satisfaction survey and the performance appraisal, as well as a negative employee perception of …

Go to article

The Biology Of Spaeroma Terebrans In Lake Pontchartrain, Louisiana With Emphasis On Burrowing, Laura Lee Wilkinson Dec 2004

The Biology Of Spaeroma Terebrans In Lake Pontchartrain, Louisiana With Emphasis On Burrowing, Laura Lee Wilkinson

LSU New Orleans Theses and Dissertations

Sphaeroma terebrans (Bate 1866) is an economically and ecologically important cosmopolitan species because this isopod is found burrowed in wood and marine structures of fresh to saline water. Existing literature on S. terebrans focuses on the destruction of red mangrove (Rhizophora mangle) in India, Pakistan, and Florida. This study concentrates on S. terebrans habitat and boring preferences in bald cypress (Taxodium distichum) in Lake Pontchartrain near the Bonnet Carre Spillway, Louisiana. In addition laboratory experiments for water column distribution and substrate preferences were conducted using cypress, Styrofoam, and balsa. Results indicate that this population may be parthenogenic and that wood …

Go to article

Algorithms And Data Structures For Automated Change Detection And Classification Of Sidescan Sonar Imagery, Marlin Gendron Dec 2004

Algorithms And Data Structures For Automated Change Detection And Classification Of Sidescan Sonar Imagery, Marlin Gendron

LSU New Orleans Theses and Dissertations

During Mine Warfare (MIW) operations, MIW analysts perform change detection by visually comparing historical sidescan sonar imagery (SSI) collected by a sidescan sonar with recently collected SSI in an attempt to identify objects (which might be explosive mines) placed at sea since the last time the area was surveyed. This dissertation presents a data structure and three algorithms, developed by the author, that are part of an automated change detection and classification (ACDC) system. MIW analysts at the Naval Oceanographic Office, to reduce the amount of time to perform change detection, are currently using ACDC. The dissertation introductory chapter gives …

Go to article

Biomimetics And Host-Guest Chemistry, Jiachang Gong Dec 2004

Biomimetics And Host-Guest Chemistry, Jiachang Gong

LSU New Orleans Theses and Dissertations

In an effort to produce the tetrahedrally coordinated, catalytically active zinc center, three families of tris(2-pyridyl)methanol derivatives were synthesized and characterized. Zinc binding studies revealed that the binding behaviors of the ligands depended on the steric and electronic properties of the substituents on the pyridyl rings, as well as the functional group on the tertiary alcohol. A novel tris-pyridyl macrocyclic receptor was synthesized. The receptor possesses both hydrogen bond donors and acceptors. NMR titration experiments revealed that the receptor simultaneously bound both ammonium cation and the counter anion. The counter anion significantly influences the association between the receptor and the …

Go to article

Mechanistic Study Of Pollutant Degradation, Weixi Zheng Dec 2004

Mechanistic Study Of Pollutant Degradation, Weixi Zheng

LSU New Orleans Theses and Dissertations

Environmental pollution has been a serious concern worldwide. Many degradation methods have been developed to clean sites contaminated with pollutants. More knowledge and better understanding in this field will help to protect our environment. The goal of the research in this thesis is to gain a better understanding of the mechanism of organic pollutant degradation in Fenton reactions and sonochemical reactions. Fenton degradation uses hydroxyl radical to oxidize organic compounds. The radical is produced by catalytic decomposition of hydrogen peroxide with Fe(II). Further research has found that addition of cyclodextrins can enhance degradation efficiency of hydrophobic organic pollutants. To study …

Go to article

Study Of Bis-Imidazol-2-Ylidines As Ligands For Transition Metal Catalyzed Coupling Reactions, Stanhope Turnbull Dec 2004

Study Of Bis-Imidazol-2-Ylidines As Ligands For Transition Metal Catalyzed Coupling Reactions, Stanhope Turnbull

LSU New Orleans Theses and Dissertations

Two bis-imidazol-2-ylidine N-heterocyclic carbenes have been employed as ancillary ligands in an attempt to illustrate their utility in the palladium-mediated preparation of aryl ethers from aryl halides. Ullman-type homo-coupling of the aryl halides persistently occurred instead of ether formation. One of the well known N-heterocyclic carbenes, IPr, was employed with the same results. A variety of reaction conditions and reagents were investigated including solvents, N-heterocyclic carbene species, palladium source, alkoxide base, palladium to ligand ratio and reaction time. Reactivity of the individual N-heterocyclic carbenes as ancillary ligands in the palladium-catalyzed amination reaction of aryl halides was investigated to determine functionality …

Go to article

Voice Of The Dead, Anthony Carl Derrico Dec 2004

Voice Of The Dead, Anthony Carl Derrico

LSU New Orleans Theses and Dissertations

N/A

Go to article

Three Factor Authentication Using Java Ring And Biometrics, Jyothi Chitiprolu Dec 2004

Three Factor Authentication Using Java Ring And Biometrics, Jyothi Chitiprolu

LSU New Orleans Theses and Dissertations

Computer security is a growing field in the IT industry. One of the important aspects of the computer security is authentication. Using passwords (something you know) is one of the most common ways of authentications. But passwords have proven to provide weak level of security as they can be easily compromised. Some other ways of authenticating a user are using physical tokens, (something you possess) and biometrics, (something you are). Using any one of these techniques to secure a system always has its own set of threats. One way to make sure a system is secure is to use multiple …

Go to article

Synthetic, Structural And Thermochemical Studies Of N-Heterocyclic Carbene (Nhc) And Tertiary Phosphine Ligands In The Ni(Co)2(L)X (L-Pr3, Nhc) Systems, Parisa Mahjoor Dec 2004

Synthetic, Structural And Thermochemical Studies Of N-Heterocyclic Carbene (Nhc) And Tertiary Phosphine Ligands In The Ni(Co)2(L)X (L-Pr3, Nhc) Systems, Parisa Mahjoor

LSU New Orleans Theses and Dissertations

Carbonyl complexes of Ni(0) incorporating two N-heterocyclic carbenes of the type Ni(CO)2(NHC)2 (NHC = ICy [N, N'-bis(cyclohexylimidazol)-2-ylidene], IMes [N, N'- bis(2, 4, 6-trimethylphenyl)-imidazol)-2-ylidene]) have been prepared. The complexes Ni(CO)2(ICy)2 (8) and Ni(CO)2(IMes)2 (9) have been synthesized and characterized by single crystal X-ray diffraction. The enthalpy of substitution reactions of Ni(CO)2(NHC) (NHC = ItBu [N, N'-bis(tert-butylimidazol)-2-ylidene], IAd [N, N'-bis(1- adamentylimidazol)-2-ylidene]) with NHC and tertiary phosphine ligands leading to the formation of Ni(CO)2(L)2 (L = NHC, PR3) complexes have been determined. The solution calorimetric investigations reiterate the greater electron donating property of the NHC ligands compared to tertiary phosphines. Thermochemical studies of …

Go to article

A Comparison Of Multiple-Model Target Tracking Algorithms, Ryan Pitre Dec 2004

A Comparison Of Multiple-Model Target Tracking Algorithms, Ryan Pitre

LSU New Orleans Theses and Dissertations

There are many multiple-model (MM) target-tracking algorithms that are available but there has yet to be a comparison that includes all of them. This work compares seven of the currently most popular MM algorithms in terms of performance, credibility, and computational complexity. The algorithms to be considered are the autonomous multiple-model algorithm, generalized pseudo- Bayesian of first order, generalized pseudo-Bayesian of second order, interacting multiple-model algorithm, B-Best algorithm, Viterbi algorithm, and reweighted interacting multiple-model algorithm. The algorithms were compared using three scenarios consisting of maneuvers that were both in and out of the model set. Based on this comparison, there …

Go to article

Dynamic Website And Data Engine Generators For Distributed Enterprise/Business Architectures, Fareed Qaddoura Dec 2004

Dynamic Website And Data Engine Generators For Distributed Enterprise/Business Architectures, Fareed Qaddoura

LSU New Orleans Theses and Dissertations

Creating websites providing dynamic services is an extensive process. Intelligent systems are used to create websites with dynamic services. Current intelligent systems are hard to use and configure by the average user. The generated websites are usually custom built to solve one problem and cannot be fully customizable for users on different environments. This thesis presents a technological solution that enables the average user to create websites with dynamic services by providing a number of parameters. The website generator is a web-based application that generates all the components of the website. The components act as portlets and the generated website …

Go to article

Relationship Between The Sludge Settling Characteristics And The Parameters Of The Activated Sludge System, Jose Angel Rojas Dec 2004

Relationship Between The Sludge Settling Characteristics And The Parameters Of The Activated Sludge System, Jose Angel Rojas

LSU New Orleans Theses and Dissertations

The activated sludge process is one of the most commonly employed domestic and industrial waste treatment process. Different types of mathematical models have been proposed for design and operation of this process, most of which do not consider the relationship between the sludge settling characteristics and the aeration unit performance. This project studies the validity of a model developed by La Motta (2004b) which links the operating parameters of an activated sludge system and the classical limiting flux sludge settling theory. Favorable results were obtained demonstrating that the model predicts very similar values of the parameters of the system in …

Go to article

Shrub Expansion In Arctic Alaska: 50 Years Of Change Documented Using Aerial Photography, Ken Tape Dec 2004

Shrub Expansion In Arctic Alaska: 50 Years Of Change Documented Using Aerial Photography, Ken Tape

Geosciences

Evidence from arctic Alaska suggests that the terrestrial landscape is changing in response to warming. Between 1946 and 1951, several thousand low-altitude panchromatic oblique aerial photographs were taken as part of geologic reconnaissance and exploration of Alaska's Arctic Slope and Brooks Range. For this study, 202 of the landscapes in the old photographs were re-photographed. Comparison of the old and new photographs revealed an increase in shrub cover in the last half-century. The changes were observed over a 220,000 km2 tract of arctic tundra, and it is likely that they are more widespread. A quantitative method for comparing the photographs …

Go to article

Physical Volcanology Of A Sub-Plinian And Phreatomagmatic Eruption At Okmok Volcano, Alaska: Implications For Explosive Mafic Volcanism, Lily J. Wong Dec 2004

Physical Volcanology Of A Sub-Plinian And Phreatomagmatic Eruption At Okmok Volcano, Alaska: Implications For Explosive Mafic Volcanism, Lily J. Wong

Geosciences

The Middle Scoria Unit (M.S.) of Okmok Volcano is a basaltic andesite (̃54 wt. % SiO₂) fall deposit that is stratigraphically located between two caldera-forming eruptions (̃12,000 and 2050 y B.P.). Stratigraphy, geochemistry, vesicularity, and crystallinity data imply that the M.S. erupted in three phases that began with an initial phreatomagmatic phase followed by a sub-Plinian phase caused by rapid ascent of magma. The sequence culminates with short-lived Vulcanian eruptions that demonstrate a strong magmatic influence and a possible decrease in ascent rate. The M.S. covers ̃300 km² and averages about 2 m thick. Estimates from this work suggest a …

Go to article

Assessing The Production Of Sockeye Salmon (Oncorhynchus Nerka) At Chilkat Lake, Southeast Alaska, Using Current Trophic Conditions And The Paleolimnologic Sediment Record, David Barto Dec 2004

Assessing The Production Of Sockeye Salmon (Oncorhynchus Nerka) At Chilkat Lake, Southeast Alaska, Using Current Trophic Conditions And The Paleolimnologic Sediment Record, David Barto

Fisheries

Anadromous sockeye salmon are the only Pacific salmon that require an extensive rearing period in a lake environment. Recent studies suggest changes in lake nutrient inputs are directly related to the magnitude of annual spawning populations (escapement), and can be quantified by sediment stable isotope analysis of nitrogen ¹⁵N). Marine nitrogen supplied by returned salmon is enriched in ¹⁵N relative to the freshwater nitrogen, which is derived from atmospheric N₂ (ð¹⁵N=0 ⁰/₀₀). Recent (1987-1996) limnological investigations of Chilkat Lake, Alaska, matched to brood year escapement estimates, indicate that sockeye marine-derived phosphorus and nitrogen contributed up to 87% and 20%, respectively, …

Go to article

Relationships Among Temperature, Depth, And Abundance Of Commercially Important Fish Captured By Trawl Vessels In The Kodiak Area Of The Gulf Of Alaska, Usa, Allison Eileen Barns Dec 2004

Relationships Among Temperature, Depth, And Abundance Of Commercially Important Fish Captured By Trawl Vessels In The Kodiak Area Of The Gulf Of Alaska, Usa, Allison Eileen Barns

Fisheries

Increased understanding of the factors influencing fish distributions and abundance may improve fisheries management and stock assessment models and may provide the fishing industry with a means to reduce bycatch. I investigated the associations of ambient seawater depth and temperature with catches of commercially important species in the Gulf of Alaska. Time-depth recorders were attached to trawl nets to collect depth and temperature data during commercial bottom trawl fishing operations. The data collected from these recorders were combined with species composition data collected by onboard observers to determine associations between these physical variables and catch of fishes. Parameters for depths …

Go to article

Phylogenetic Relationships And Identification Of Juveniles Of The Genus Sebastes, Zhuozhuo Li Dec 2004

Phylogenetic Relationships And Identification Of Juveniles Of The Genus Sebastes, Zhuozhuo Li

Fisheries

The genus Sebastes is speciose and most members are distributed in the northeastern Pacific Ocean (NEP). Historically, morphology has been the basis for species identification and determination of phylogenetic relationships. However, because many Sebastes species overlap in range and are similar in morphology, especially during early life stages, morphological characters are often inadequate for species identification. This study examines the potential of using restriction site variation in the mitochondrial NADH-dehydrogenase subunits -3 and -4 and 12S and 16S ribosomal RNA genes to resolve the problems in species identification and phylogenetic relationships, particularly assignments to subgenera. Of the 71 species representing …

Go to article

Distribution And Ecology Of Exotic Plants In Wrangell-St. Elias National Park And Preserve, Alaska, Paul Christian Mckee Dec 2004

Distribution And Ecology Of Exotic Plants In Wrangell-St. Elias National Park And Preserve, Alaska, Paul Christian Mckee

Natural Resources

The distribution of exotic plants and site factors influencing their abundance on roads and trails were studied in Wrangell-St. Elias National Park and Preserve during the summer of 2003. Seventeen species of exotic plants were found in the park at 173 locations. The most common species (Taraxacum officinale, Plantago major) were present at all study sites, while some (Trifolium spp., Bromus inermis, Leucanthemum vulgare) were restricted to specific disturbance types and particular areas. Though sampling was limited to areas in which exotic plants were growing, percent cover of exotics was not a significant component of sample sites, and exotic species …

Go to article

Transient Spatiotemporal Chaos On Complex Networks, Safia Rawoot Dec 2004

Transient Spatiotemporal Chaos On Complex Networks, Safia Rawoot

Physics

Some of today's most important questions regard complex dynamical systems with many interacting components. Network models provide a means to gain insight into such systems. This thesis focuses on a network model based upon the Gray-Scott cubic autocatalytic reaction-diffusion system that manifests transient spatiotemporal chaos. Motivated by recent studies on the small-world topology discovered by Watts and Strogatz, the network's original regular ring topology was modified by the addition of a few irregular connections. The effects of these added connections on the system's transience as well on the dynamics local to the added connections were examined. It was found that …

Go to article

Synchronization In Biological Systems, Jonathan P. Klaas Dec 2004

Synchronization In Biological Systems, Jonathan P. Klaas

Physics

Synchronization, the adjustment of rhythms via coupling, is an essentially nonlinear effect in coupled dynamical systems. Synchronization is observed in many systems, for example the moon's periods of rotation and revolution, in pendulums suspended from a common support, in swarms of fireflies that flash in unison, and in biological circadian rhythms. Circadian rhythms are periodic fluctuations in multiple physiological systems that have evolved as a consequence of the daily rotation of the earth. These rhythms have been observed in organisms ranging from cyanobacteria to man. In this thesis we will present a conceptually simple model of circadian rhythms to yield …

Go to article

Soil Properties And Forest Stand Characteristics Along A Toposequence Of The Smith Lake Area Near Fairbanks, Alaska, Lijie Zhu Dec 2004

Soil Properties And Forest Stand Characteristics Along A Toposequence Of The Smith Lake Area Near Fairbanks, Alaska, Lijie Zhu

Plant, Animal and Soil Sciences

Forests, soils and their relationships were studied along a toposequence over an elevation range from 161 meters to 213 meters near Smith Lake on the University of Alaska Fairbanks campus, Fairbanks, Alaska. Forest cover type and understory species composition change along the slope from top to bottom and are related to temperature and moisture. Aspen occurs on the ridge top. Paper birch grows best on the shoulder. White spruce, which has the greatest commercial value, is the only species present on all slope positions; it grows best on shoulder and back slopes. Black spruce dominates on the wet and cold …

Go to article

Tribological Comparison Of Materials, Bing Shi Dec 2004

Tribological Comparison Of Materials, Bing Shi

Chemistry and Biochemistry

Approximately 600,000 total joint replacement surgeries are performed each year in the United States. Current artificial joint implants are mainly metal-on-plastic. The synthetic biomaterials undergo degradation through fatigue and corrosive wear from load-bearing and the aqueous ionic environment of the human body. Deposits o f inorganic salts can scratch weight-bearing surfaces, making artificial joints stiff and awkward. The excessive wear debris from polyethylene leads to osteolysis and potential loosening of the prosthesis. The lifetime for well-designed artificial joints is at most 10 to 15 years. A patient can usually have two total joint replacements during her/his lifetime. Durability is limited …

Go to article

Who's "Fat", Who's Not: Sociocultural Influences On Female Adolescent's Body Image, Lindsay Astheimer Paxton Dec 2004

Who's "Fat", Who's Not: Sociocultural Influences On Female Adolescent's Body Image, Lindsay Astheimer Paxton

Counseling

Sociocultural influences, media, parents and peers, on adolescent females' body image, as perceived by female high school students of a military related community were investigated. A body image survey was administered to 26 adolescent females. Ultimately, the research revealed that media, parents and peer groups influenced adolescent body image and significantly contributed to female students' perceptions and attitudes.

Go to article

Market Opportunities For Carbon Sequestration In Alaska, Jennifer Elizabeth Duval Dec 2004

Market Opportunities For Carbon Sequestration In Alaska, Jennifer Elizabeth Duval

Economics

Global climate change has been at the forefront of environmental concerns for the last few decades. Based on the success of the United States' sulfur dioxide cap-and-trade program, a market for greenhouse gas emissions has slowly emerged. Russia's recent ratification of the Kyoto Protocol will bring an international market into force in February 2005. This thesis examines the economic theory behind cap-and-trade markets as solutions for environmental problems and discusses the characteristics of the markets for greenhouse gas emissions. The opportunities for Alaska's participation are examined, particularly offsetting diesel emissions from rural generators with wood or alternative energies. The calculations …

Go to article

2004 Fall Commencement Program: Winona State University, Winona State University Dec 2004

2004 Fall Commencement Program: Winona State University, Winona State University

WSU Commencement Programs

This is the Winona State University Fall 2004 commencement program. Commencement was on Friday, December 17, 2004.

Go to article

Oscillatory Interlayer Exchange Coupling In [Pt/Co]N/Nio/[Co/Pt]N Multilayers With Perpendicular Anisotropy: Dependence On Nio And Pt Layer Thicknesses, Z. Y. Liu, Lanping Yue, D. J. Keavney, Shireen Adenwalla Dec 2004

Oscillatory Interlayer Exchange Coupling In [Pt/Co]N/Nio/[Co/Pt]N Multilayers With Perpendicular Anisotropy: Dependence On Nio And Pt Layer Thicknesses, Z. Y. Liu, Lanping Yue, D. J. Keavney, Shireen Adenwalla

Materials Research Science and Engineering Center: Faculty Publications

Interlayer exchange coupling has been studied in a series of [Pt( tPt Å)/Co(4 Å)]n/NiO( tNiO)/[Co(4 Å)/Pt( tPt Å)]n multilayers with perpendicular anisotropy. The coupling oscillates between antiferromagnetic and ferromagnetic as a function of tNiO with a period of ~5 Å, and the oscillatory behavior is related to the antiferromagnetic ordering of the NiO layer. This interlayer coupling between two Co/Pt multilayers is shown to occur domain by domain by magnetic force microscopy imaging. For the strongest antiferromagnetic coupling at tNiO = 11 Å, an oscillation with a period of ~6 Å is superposed …

Go to article

University Of Nebraska At Omaha, December Commencement 2004, University Of Nebraska At Omaha Dec 2004

University Of Nebraska At Omaha, December Commencement 2004, University Of Nebraska At Omaha

Commencement Programs

No abstract provided.

Go to article

A Quest For Making A Difference One Life At A Time, Tracie Farner Dempsey Dec 2004

A Quest For Making A Difference One Life At A Time, Tracie Farner Dempsey

Digitized Theses and Dissertations (prior to 2008)

A Portfolio Submitted to the Graduate Faculty of Kennesaw State University In partial fulfillment of the Requirements for the degree MASTER OF EDUCATION IN ADOLESCENT EDUCATION- Science

Go to article

First Prev Next Last