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Articles 20161 - 20190 of 25685

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Novel Algorithms For Medium/Low-Voltage Arcing Faults In Switchgear & Motor Coils: From Concept To Realization, Mandhir Singh Sahni Jul 2008

Novel Algorithms For Medium/Low-Voltage Arcing Faults In Switchgear & Motor Coils: From Concept To Realization, Mandhir Singh Sahni

Electrical Engineering Dissertations - Archive

Switchgear arcing faults have been a primary cause for concern for the manufacturing industry and safety personnel alike. The deregulation of the power industry being in full swing and ever-growing competitiveness in the distribution sector calls for the transition from preventive to predictive maintenance. Switchgear forms an integral part of the distribution system in any power system set-up. Keeping in mind the switchgear arcing faults, the transition mentioned above applies most of all to the switchgear industry. Apart from the fact that it is the primary cause of serious injuries to electrical workers worldwide, switchgear arcing faults directly affect the …

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Stepping-Stone Network Attack Kit (Sneak) For Evading Timing-Based Detection Methods Under The Cloak Of Constant Rate Multimedia Streams, Jaideep D. Padhye Jul 2008

Stepping-Stone Network Attack Kit (Sneak) For Evading Timing-Based Detection Methods Under The Cloak Of Constant Rate Multimedia Streams, Jaideep D. Padhye

Computer Science and Engineering Theses - Archive

With the advent of the Internet, network-based security threats have been constantly on the rise. The source of an attack could be traced by studying the system logs and the source IP address of the attack can be used to identify and prosecute the attacker. To avoid getting traced and to mislead the forensic investigators, attackers usually compromise weaker nodes on less secure networks and use them as stepping stones to attack the victim. This technique makes it difficult for the investigators to trace the real source of attack. Hence, it is important to research the stepping stone detection techniques …

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Efficient Processing Of Set Queries Using Bitmap Index, Muhammad Assad Safiullah Jul 2008

Efficient Processing Of Set Queries Using Bitmap Index, Muhammad Assad Safiullah

Computer Science and Engineering Theses - Archive

Growing complexity of enterprise-wide data and business processes necessitates the efficiency of complex decision support set queries. However, contemporary DBMS remain unsuccessful in handling set queries efficiently. In this thesis we propose efficient set query processing methods using bitmap index. The methods use bitmap vectors to represent attributes values in binary format. The methods test groups within a schema in a hierarchical fashion. Satisfying groups are bisected further and checked recursively while non-satisfying groups are pruned resulting in significant reduction in response times. In addition, our iterative implementation avoids the inefficiency that can be introduced by recursive implementation by reading …

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Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob Jul 2008

Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob

Electrical Engineering Theses - Archive

JPEG2000, the international standard for still image compression, uses the wavelet transform. The filters used in JPEG2000 for transformation are the 9/7 Daubechies filters and the 5/3 Le Gall filters. At present, to achieve image mirroring or rotation for images, one has to convert them back to spatial domain and proceed. This thesis presents methods by which it can be implemented in the wavelet domain, without extra computational complexity. To do so, one manipulates the transform domain coefficients so that the condition of perfect reconstruction still holds true. The thesis also discusses a method to achieve image interpolation, which would …

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Species Limits And Phylogenetic Systematic Of The Diurnal Geckos Of The Genus Gonatodes (Squamata: Sphaerodactylidae), Walter E. Schargel Jul 2008

Species Limits And Phylogenetic Systematic Of The Diurnal Geckos Of The Genus Gonatodes (Squamata: Sphaerodactylidae), Walter E. Schargel

Biology Dissertations - Archive

The genus Gonatodes (family Sphaerodactylidae) is a diverse of group of about 20 species currently recognized of mostly diurnal geckos that are collectively distributed from southern Mexico to Brazil and Bolivia, and also including most of the Caribbean Islands. The systematics of this group remains poorly studied with published contributions limited mostly to the original species descriptions, natural history notes, and a recent, yet largely incomplete, molecular phylogeny. In this work, several contributions to the systematics of this genus are made. The first chapter is a general introduction to the group. Chapter 2 is a phylogeographic study of the G. …

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How Herbivores Affect Plant Growth, Community Structure And Litter Decomposition In Alaskan Tundra: Implications For Responses To Climate Change, David R. Johnson Jul 2008

How Herbivores Affect Plant Growth, Community Structure And Litter Decomposition In Alaskan Tundra: Implications For Responses To Climate Change, David R. Johnson

Biology Dissertations - Archive

Increasing atmospheric carbon dioxide (CO2) concentrations have caused higher air temperatures in the Arctic. Because arctic organisms are temperature limited, warmer conditions lead to higher decomposition and nutrient cycling rates by soil microorganisms resulting in positive feedbacks; more CO2 is released from warmer soils thus increasing global atmospheric CO2 concentrations. Higher decomposition and nutrient cycling rates increase soil nutrient availability for plants resulting in increased net primary productivity (NPP) and shifts in community structure. If these "warmer" communities contain more woody shrubs, they may store more carbon in plant tissue, potentially offsetting increases in CO2 from decomposition. However, little is …

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Proteasomal Gene Duplications And Recruitment Of Testis Specific Expression In Drosophila, Mehran Sorourian Jul 2008

Proteasomal Gene Duplications And Recruitment Of Testis Specific Expression In Drosophila, Mehran Sorourian

Biology Theses - Archive

Proteasome is a large multisubunit complex that degrades ubiquitinated proteins in a highly regulated manner in all eukaryotes. Two subcompartments of this subunit are the 19Scap and the 20S core particle with 19S acting as regulatory subunit, it attaches at both ends of the 20Score particle harboring the catalytic domains. In D. melanogaster one third of the genes encoding for this subunit were recognized to have many male specific duplicates. In this work, we make use of the new 12 genomes sequences and show that the majority of the genes encoding for the 20S particle gave rise to at least …

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Texas Homeland Security: Trust, Communication, And Effective Working Relationships Between Regional Coordinators And Local Respondents, Bobbie Brown Jul 2008

Texas Homeland Security: Trust, Communication, And Effective Working Relationships Between Regional Coordinators And Local Respondents, Bobbie Brown

Political Science Theses - Archive

Policy implementation and intergovernmental relationships are most often examined from a federal/state perspective. This research, however, focuses on the effectiveness of working relationships between the two lower-levels of state government (i.e. regional and local jurisdictions) who implement homeland security policies in Texas. Using elite interviews conducted with the principal homeland security officials from the regional Councils of Governments and survey responses from chiefs of police across the state, this study seeks to identify what environmental, agency, and individual characteristics are associated with effective working relationships between these lower-levels of state government. Texas chose to integrate the implementation of its homeland …

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A Contextual Analysis Of A Preclassic Problematic Deposit At Blackman Eddy, Belize, Rebecca Lynn Shelton Jul 2008

A Contextual Analysis Of A Preclassic Problematic Deposit At Blackman Eddy, Belize, Rebecca Lynn Shelton

Sociology & Anthropology Theses - Archive

This thesis examines Problematic Deposit #3 from two operations in Plaza B at Blackman Eddy, Belize through a detailed contextual analysis. Due to the ambiguous nature of problematic deposits, several methods of analysis were utilized to determine the event or events associated with the cultural material and the architectural remains uncovered in the two operations. For the analysis of the ceramic assemblage, the type-variety method was first utilized to determine the relative date of PD#3. Second, a functional analysis of the partial vessels within the problematic deposit was performed and a radiometric AMS date was collected from PD#3 of 380 …

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The Acoustic Correlates Of Atr Harmony In Seven- And Nine-Vowel African Languages: A Phonetic Inquiry Into Phonological Structure, Coleen Grace Anderson Starwalt Jul 2008

The Acoustic Correlates Of Atr Harmony In Seven- And Nine-Vowel African Languages: A Phonetic Inquiry Into Phonological Structure, Coleen Grace Anderson Starwalt

Linguistics & TESOL Dissertations - Archive

This study compares eleven Niger-Congo languages with [ATR] harmony and seeks to determine especially whether the acoustic properties of the "voice quality" differences associated with [ATR] in nine-vowel languages, such as Akan, are present or absent in all, some or none of the seven-vowel languages. Of particular interest is the nature of the height 2 and 3 vowels of the nine- and degree 2 vowels of seven-vowel systems. First, this study corroborates previous work on nine-vowel systems by demonstrating that height 2 vowels [-ATR] [? ?] frequently overlap with height 3 vowels [+ATR] [e o]. Next, it considers the question …

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The Control Of Gene Expression By High Light Stress In Cyanobacteria Through The Apparent Two-Component Nbls-Rpab Signal Transduction Pair, Anthony David Kappell Jul 2008

The Control Of Gene Expression By High Light Stress In Cyanobacteria Through The Apparent Two-Component Nbls-Rpab Signal Transduction Pair, Anthony David Kappell

Biology Dissertations - Archive

In nature photosynthetic organisms including cyanobacteria are dependent upon their ability to acclimate to changes in environmental conditions including light and nutrient levels. The NblS sensor kinase of the cyanobacterium Synechococcus elongatus PCC 7942 regulates gene expression in response to a number of stress conditions including high-intensity light and nutrient limitation. NblS is known as DspA or Hik33 in the cyanobacterium Synechocystis PCC 6803. We determined that the high light-inducible hliA gene from S. elongatus is under negative control through NblS. We have identified the High Light Regulatory 1 (HLR1) sequence (two direct repeats of (G/T)TTACA(T/A)(T/A) separated by two nucleotides) …

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A Context-Aware Learning, Prediction And Mediation Framework For Resource Management In Smart Pervasive Environments, Nirmalya Roy Jul 2008

A Context-Aware Learning, Prediction And Mediation Framework For Resource Management In Smart Pervasive Environments, Nirmalya Roy

Computer Science and Engineering Dissertations - Archive

Advances in smart devices, mobile wireless communications, sensor networks, pervasive computing, machine learning, middleware and agent technologies, and human computer interfaces have made the dream of smart environments a reality. An important characteristic of such an intelligent, ubiquitous computing and communication paradigm lies in the autonomous and pro-active interaction of smart devices used for determining inhabitants' important contexts such as current and near-future locations, activities or vital signs. `Context Awareness' is perhaps the most salient feature of such an intelligent computing environment. An inhabitant's mobility and activities play a significant role in defining his contexts in and around the home. …

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Mass Spectrometry Based Proteomic Biomarker Selection And Sample Prediction, Jung Hun Oh Jul 2008

Mass Spectrometry Based Proteomic Biomarker Selection And Sample Prediction, Jung Hun Oh

Computer Science and Engineering Dissertations - Archive

High-resolution MALDI-TOF (matrix-assisted laser desorption/ionization time-of-flight) mass spectrometry has recently shown promise as a screening tool for detecting discriminatory peptide/protein patterns. The major computational obstacle in finding such patterns is the large number of mass/charge peaks (features, biomarkers, data points) in a spectrum. To tackle this problem, we have developed methods for data preprocessing and biomarker selection. The preprocessing consists of binning, baseline correction, and normalization. An algorithm, Extended Markov Blanket (EMB), is developed for biomarker detection, which combines redundant feature removal and discriminant feature selection. The biomarker selection couples with support vector machine (SVM) to achieve sample prediction from …

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Comprehensive Data Analysis For Biomarker Pattern Discovery Using Dna/Protein Microarrays, Young Bun Kim Jul 2008

Comprehensive Data Analysis For Biomarker Pattern Discovery Using Dna/Protein Microarrays, Young Bun Kim

Computer Science and Engineering Dissertations - Archive

During the last decade, the advent of microarray technology has stimulated rapid research advances in bioinformatics. Microarray data pose great challenges for computational data analysis, because of their large dimensionality (up to several tens of thousands of genes) and their small sample sizes. In order to deal with these particular characteristics of microarray data, the need and importance for feature selection techniques were realized. While a lot of research deals with classification methods and their application to microarray data, only a few approaches are explicitly designed to consider interaction among the investigated features. It is well known that the interactions …

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First-Principles Study On Hard/Soft Smco5/Co(Fe) Nanocomposite Magnetic Materials, Dangxin Wu Jul 2008

First-Principles Study On Hard/Soft Smco5/Co(Fe) Nanocomposite Magnetic Materials, Dangxin Wu

Physics Dissertations - Archive

More than a decade ago, exchange-spring permanent magnets containing soft and hard magnetic phases have been proposed to enlarge maximum energy product values through exchange coupling between the magnetically soft and hard phases. Indeed some later experiments have shown some promises in this regard. However, there are still many pending fundamental issues in the understanding and enhancement of the exchange coupling. In this dissertation, we have performed first-principles study based on the density functional theory to tackle some of these issues, including the effects of soft phase properties and interfacial conditions on the exchange coupling, using SmCo5 as hard phase …

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Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale Jul 2008

Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale

Electrical Engineering Theses - Archive

Ultra-Wideband (UWB) is an upcoming technology for short-range high data rate applications like Wireless Personal Area Networks or medium/long-range low data rate applications like sensor networks. UWB has many captivating characteristics such as very short duration pulses (order of nanoseconds), multipath channel, large instantaneous bandwidth and time hopping pulse trains resulting in coexistence with the existing narrow band users. The Ultra Wideband communication systems employ the technique of Impulse radio of transmitting short duration pulses which result in extremely wide bandwidth and many performance benefits. Since UWB systems operate in dense multipath environments, RAKE receiver is the optimum choice for …

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Silicon Carbide Nanotubes: Promises Beyond Carbon Nanotubes, Kazi Mohammad Monirul Alam Jul 2008

Silicon Carbide Nanotubes: Promises Beyond Carbon Nanotubes, Kazi Mohammad Monirul Alam

Physics Theses - Archive

First-principles calculations for the electronic and geometric structures of three different types of armchair and zigzag silicon carbide nanotubes from (3, 3) to (11, 11) and (3, 0) to (11, 0) have been performed using hybrid density functional theory and the finite cluster approximation. Full geometry and spin optimizations have been performed without any symmetry constraints. A detailed comparison of the structures and stabilities of the three types of nanotubes is presented. The dependence of the electronic band gaps on the respective tube diameters, energy density of states and dipole moments as well as Mulliken charge distributions have been investigated. …

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Research Utilization Barriers Perceived By Nurses In The Emergency Department, Yen Hai Nguyen Jul 2008

Research Utilization Barriers Perceived By Nurses In The Emergency Department, Yen Hai Nguyen

Nursing Theses - Archive

The purpose of this quantitative, descriptive study is to explore and describe Emergency Department nurses' perceived barriers to research utilization. The setting of this study takes place in the Emergency Department of a community hospital in North Central Texas. The BARRIERS to Research Utilization Scale (Funk, Champagne, Wiese, & Tornquist, 1991a) was the questionnaire used in this study. Sixteen completed questionnaires were obtained. The greatest barrier identified by this sample was that nurses do not feel they have enough authority to affect change, which is the same primary barrier found by Funk, Champagne, Wiese, and Tornquist in 1991. Implications for …

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Design Evaluation Of A Low-Tension Cable Guardrail End Terminal System, Cody S. Stolle, Karla A. Polivka, Ronald K. Faller, John R. Rohde, Dean L. Sicking, Rebecca A. Hitz, Kirk J. Molacek, John D. Reid Jul 2008

Design Evaluation Of A Low-Tension Cable Guardrail End Terminal System, Cody S. Stolle, Karla A. Polivka, Ronald K. Faller, John R. Rohde, Dean L. Sicking, Rebecca A. Hitz, Kirk J. Molacek, John D. Reid

Nebraska Department of Transportation: Research Reports

No abstract provided.

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Independent Study On Infinite Graph Theory, Martin Zimmermann Jul 2008

Independent Study On Infinite Graph Theory, Martin Zimmermann

Technical Reports

In this paper we will prove some results about infinite graphs. We show that for every linear order there is a graph with a distinguished vertex such that the edges adjacent to that vertex have the given order in any plane drawing. The other results are concerned with connectivity. We prove a generalization of a characterization of 2-­connected graphs and prove that k-­connectedness does not imply the existence of finite k­connected subgraphs for k > 2.

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Probing The 5f Electrons: A Relativistic Dft Study Of Americium Surfaces, Pratik Pankajkumar Dholabhai Jul 2008

Probing The 5f Electrons: A Relativistic Dft Study Of Americium Surfaces, Pratik Pankajkumar Dholabhai

Physics Dissertations - Archive

Surface chemistry and physics have been and continues to be very active fields of research because of the obvious scientific and technological implications and consequent importance of such research. One of the many motivations for this burgeoning effort has been the desire to understand surface corrosion, metallurgy and catalytic activity in order to address environmental concerns. In particular, such efforts are important for a group of strongly correlated and heavy fermion systems like the actinides, for which experimental work is relatively difficult to perform due to material problems and toxicity. These metals are among the most complex of the long-lived …

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Strong Navajo Marriages, Linda Skogrand, Mary Lou Mueller, Rachel Arrington, Heidi Leblanc, Davina Spotted Elk, Irine Dazyie, Reva Rosenband Jul 2008

Strong Navajo Marriages, Linda Skogrand, Mary Lou Mueller, Rachel Arrington, Heidi Leblanc, Davina Spotted Elk, Irine Dazyie, Reva Rosenband

Nutrition, Dietetics, and Food Sciences Faculty Publications

The purpose of this qualitative study, conducted in two Navajo Nation chapters, was to learn what makes Navajo marriages strong because no research has been done on this topic. Twenty-one Navajo couples (42 individuals) who felt they had strong marriages volunteered to participate in the study. Couples identifi ed the following marital strengths: (1) maintain communication, (2) nurture your relationship, (3) learn about marriage, (4) be prepared for marriage, and (5) have a strong foundation.

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Generation Of Monthly Precipitation Under Limited Data And Climate Change: An Example From The Upper Blue Nile River Basin, U. Kim, Jagath J. Kaluarachchi, V. Smakhtin Jul 2008

Generation Of Monthly Precipitation Under Limited Data And Climate Change: An Example From The Upper Blue Nile River Basin, U. Kim, Jagath J. Kaluarachchi, V. Smakhtin

Civil and Environmental Engineering Faculty Publications

This work develops a methodology to project the future precipitation in large river basins under limited data and climate change while preserving the historical temporal and spatial characteristics. The computationally simple and reliable conditional generation method (CGM) is presented and applied to generate reliable monthly precipitation data in the upper Blue Nile River Basin of Ethiopia where rain-fed agriculture is prevalent. The results showed that the temporal analysis with the CGM performs better to reproduce the historical long-term characteristics than other methods, and the spatial analysis with the CGM reproduced the historical spatial structure accurately. A 100-year time series analysis …

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Effect Of High Intensity Ultrasound On Crystallization Behavior Of Anhydrous Milk Fat, Silvana Martini, A. H. Suzuki, R. W. Hartel Jul 2008

Effect Of High Intensity Ultrasound On Crystallization Behavior Of Anhydrous Milk Fat, Silvana Martini, A. H. Suzuki, R. W. Hartel

Nutrition, Dietetics, and Food Sciences Faculty Publications

The need to eliminate trans-fatty acids from foods’ formulation resulted in the exploration of new lipid sources and alternative processing conditions that will improve the physicochemical characteristics and nutritional qualities of lipid-based foods. In general, the physicochemical characteristics of lipid networks depend on the microstructure and crystallization behavior of the system. The objective of this work was to use high intensity ultrasound (HIU) as an additional processing condition to alter the crystallization behavior of a lipid model system (anhydrous milk fat). Results show that HIU application not only decreases the induction time of crystallization (faster crystallization) at a constant crystallization …

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Economic Performance Of The 'Push-Pull' Technology For Stemborer And Striga Control In Smallholder Farming Systems In Western Kenya, Zeyaur R. Khan, Charles A.O. Midega, Esther M. Njuguna, David M. Amudavi, Japhether M. Wanyama, John A. Pickett Jul 2008

Economic Performance Of The 'Push-Pull' Technology For Stemborer And Striga Control In Smallholder Farming Systems In Western Kenya, Zeyaur R. Khan, Charles A.O. Midega, Esther M. Njuguna, David M. Amudavi, Japhether M. Wanyama, John A. Pickett

All Peer-Reviewed Publications

The 'push-pull' technology (PPT), developed in Africa, offers effective control of cereal stemborers and Striga weed in maize-based cropping systems. It involves intercropping maize with desmodium, Desmodium uncinatum, with Napier grass, Pennisetum purpureum, planted as border around this intercrop. Desmodium repels the stemborer moths (push) that are subsequently attracted to the Napier grass (pull). Desmodium also suppresses and eliminates Striga. We assessed economic performance of this technology compared to the conventional maize mono- and maize-bean intercropping systems in six districts in western Kenya over 4-7 years. Ten farmers were randomly recruited in each district and each planted three plots representing …

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Water Use Of Four Street Tree Species In Bangkok, Thailand, Roger Kjelgren, Ladawan Puangchit, Chalita Sriladda, Montathip Someechai Jun 2008

Water Use Of Four Street Tree Species In Bangkok, Thailand, Roger Kjelgren, Ladawan Puangchit, Chalita Sriladda, Montathip Someechai

Plants, Soils, and Climate Faculty Publications

Water use of four selected tree species commonly used on Bangkok streets under well-watered conditions was investigated in two studies during the mid and late periods of the characteristic monsoonal dry season. Field grown trees of Cassia fistula, Pterocarpus indicus, Lagerstroemia loudonii, and Swietenia macrophylla, were harvested as per local nursery practices, potted into 20 L containers with organic media and allowed to establish for three weeks prior to each study. Tree water use was measured gravimetrically during the cooler mid monsoonal dry period in late January, and again during the hotter late monsoonal period in late March, concurrent with …

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A Bayesian Hierarchical Model For Analysis Of Snp Diversity In Multilocus, Multipopulation Samples, Feng Guo, Dipak Dey, Kent Holsinger Jun 2008

A Bayesian Hierarchical Model For Analysis Of Snp Diversity In Multilocus, Multipopulation Samples, Feng Guo, Dipak Dey, Kent Holsinger

EEB Articles

The distribution of genetic variation among populations is conveniently measured by Wright’s FST , which is a scaled variance taking on values in [0,1]. For certain types of genetic markers, and for single-nucleotide polymorphisms (SNPs) in particular, it is reasonable to presume that allelic differences at most loci are selectively neutral. For such loci, the distribution of genetic variation among populations is determined by the size of local populations, the pattern and rate of migration among those populations, and the rate of mutation. Because the demographic parameters (population sizes and igration rates)are common across all autosomal loci, locus-specific estimates of …

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Where Is 'Community' In Community Based Forestry?, Courtney G. Flint, A. E. Luloff, James C. Finley Jun 2008

Where Is 'Community' In Community Based Forestry?, Courtney G. Flint, A. E. Luloff, James C. Finley

Sociology, Social Work and Anthropology Faculty Publications

Community-based forestry and community-based natural resource management have become increasingly common terms in both the scientific and popular press. However, as with so many other concepts currently in vogue, rarely do studies invoking them incorporate either a grounded theoretical understanding or practical inclusion of the central term: community. Community emerges through communication and interaction among people who care about each other and the place they live. In its purest form, community is marked by its multiple and often conflicting perspectives. This article draws upon recent research experience with the Ford Foundation's community-based forestry initiative to illustrate the importance of solidly …

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Requests Of Brown By Lc Classification: June 2008, Ruth E.. Souto Jun 2008

Requests Of Brown By Lc Classification: June 2008, Ruth E.. Souto

HELIN Monthly Loan Statistics

Requests of Brown from other HELIN libraries - June 2008

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Maryland's (Out Of The Trench) Experience, Pamela Bluh Jun 2008

Maryland's (Out Of The Trench) Experience, Pamela Bluh

Faculty Scholarship

This presentation is part of a program entitled "Implementing BePress' Digital Commons Institutional Repository Solution: Two Views from the Trenches" developed with the University of Georgia Law Library and presented at the CALI Conference, June 2008, Baltimore, MD.

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