Physical Sciences and Mathematics | Open Access Articles

Role Of Apolipoprotein A-1 In Defense Against Bacteria By Striped Bass (Morone Saxatilis), L. Danielle Johnston

Dissertations, Theses, and Masters Projects

No abstract provided.

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A Molecular Technique For Specific Identification Of Western Atlantic Ocean Scombrids And An Analysis Of A Larval Scombrid Assemblage Off The Kona Coast Of Hawaii, Melissa A. Paine

Dissertations, Theses, and Masters Projects

No abstract provided.

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Physiological Consequences Of High Water Flow On The Coral Montastrea Annularis (Ellis And Solander, 1786), Lawrence W. Carpenter

Dissertations, Theses, and Masters Projects

Water-flow is a vital component to the life histories of sessile marine invertebrates and essential to the structure and function of coral reefs. Recent studies have identified water-flow as an asset in the resistance to and recovery from short-term bleaching events of high irradiance and thermal increases. to determine whether the benefits of water-flow scale from the landscape level down to the flow patterns experienced over individual polyps and to quantify potential metabolic consequences, three studies were performed on Montastrea annularis (Ellis and Solander, 1786), using in situ heated bleaching flow-chambers during two saturation missions at the Aquarius underwater laboratory. …

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Developing A Stock Assessment For The Barndoor Skate (Dipturus Laevis) In The Northeast United States, Todd Gedamke

Dissertations, Theses, and Masters Projects

The barndoor skate Dipturus laevis is one of seven species in the United States Northwest Atlantic skate complex. The species received little attention until a recent article published in Science reported that the barndoor skate might be on the brink of extinction. In this study, we address not only the virtual lack of information on the life history of the species, but also develop methodologies to assist in the assessment of the barndoor skate population. to investigate the life history of the species, data were collected from 2,310 specimens caught during commercial sea scallop dredging in the southern section of …

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Development Of An Unstructured Grid, Finite Volume Eutrophication Model For The Shallow Water Coastal Bay: Application In The Lynnhaven River Inlet System, Yuepeng Li

Dissertations, Theses, and Masters Projects

The shallow water region is an important portion of the estuarine and coastal waters, since it encompasses the entire land-water margin as the buffer zone and supports one of the most productive ecosystems. When light can penetrate to the sediment, it triggers the benthic microalgae community to perform photosynthesis, resulting in a benthic-pelagic exchange flux different from that of the deeper water. This study utilized the laboratory-measured benthic flux, and a suite of well-calibrated numerical models to examine the eutrophication process in the Lynnhaven River Inlet system with special emphasis on: the role played by benthic microalgae, and nutrient budgets …

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Meta-Analysis Of Open Vs Closed Surgery Of Mandibular Condyle Fractures, Marcy Lauren Nussbaum

Theses and Dissertations

A review of the literature reveals a difference of opinion regarding whether open or closed reduction of condylar fractures produces the best results. It would be beneficial to critically analyze past studies that have directly compared the two methods in an attempt to answer this question. A Medline search for articles using the key words 'mandibular condyle fractures' and 'mandibular condyle fractures surgery' was performed. The articles chosen for the meta-analysis contained data on at least one of the following: postoperative maximum mouth opening, lateral excursion, protrusion, deviation on opening, asymmetry, and joint pain or muscle pain. Several common statistical …

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Sediment Biogeochemistry Of Northern Cascadia Margin Shallow Gas Hydrate Systems, John W. Pohlman

Dissertations, Theses, and Masters Projects

Methane contained in gas hydrate is a significant component of the global organic carbon inventory. Describing the methane sources supporting these systems and the mechanisms that control the distribution of methane in marine sediments are critical elements in evaluating the resource potential, climate change implications and geologic hazards associated with gas hydrate. The northern Cascadia margin (offshore Vancouver Island, Canada) is a convergent margin with gas hydrate-bearing cold seeps composed of both thermogenic (Barkley Canyon) and microbial (Bullseye vent) gas sources. Gas hydrate and sediment cores were collected from each of these settings to examine the sources that sustain the …

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Visualization Of Secondary Rna Structure Prediction Algorithms, Brandon Hunter

Master's Projects

This chapter introduces the secondary structure prediction problem. It describes what the secondary structure prediction problem is and why it is important. Based on the importance of the algorithm it is essential to have a clear means to visually represent the problem. Therefore, this chapter details the high level goals of the visualization. It details how the visualization will visually represent the problem through several simultaneous representations. These visual representations will be tied together in order to increase the understanding of the algorithm.

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Concept Based Document Clustering Using A Simplicial Complex, A Hypergraph, Kevin Lind

Master's Projects

This thesis evaluates the effectiveness of using a combinatorial topology structure (a simplicial complex) for document clustering. It is believed that a simplicial complex better identifies the latent concept space defined by a collection of documents than the use of hypergraphs or human categorization. The complex is constructed using groups of co-occurring words (term associations) identified using traditional data mining methods. Disjoint subsections of the complex (connect components) represent general concepts within the documents’ concept space. Documents clustered to these connect components will produce meaningful groupings. Instead, the most specific concepts (maximal simplices) are used as representative connect components to …

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Compact Representation Of Association Rule, Mien K. Siao

Master's Projects

Bitmap is an extremely efficient way of representing data, but the drawback is that the order of data is fixed in a bitmap. Granular computing is a new theory that frees the bitmap method from fixed order of data in the same manner as linear algebra frees the matrix theory from a fixed basis. To obtain meaningful information using data mining techniques has been a central idea in recent database applications [2]. One of the core techniques in data mining is to find associations (undirected association rules) between attribute values [4]. The complexity of finding associations is often very high. …

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A Meaningful Md5 Hash Collision Attack, Narayana D. Kashyap

Master's Projects

It is now proved by Wang et al., that MD5 hash is no more secure, after they proposed an attack that would generate two different messages that gives the same MD5 sum. Many conditions need to be satisfied to attain this collision. Vlastimil Klima then proposed a more efficient and faster technique to implement this attack. We use these techniques to first create a collision attack and then use these collisions to implement meaningful collisions by creating two different packages that give identical MD5 hash, but when extracted, each gives out different files with contents specified by the atacker.

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Automatic Extraction Of Keywords And Co-Occurrence Keyword Sets, Mong-Hang Vo

Master's Projects

Internet search has become an essential part of almost everyone’s daily life and work. To make wise personal and business decisions in a timely fashion, one must access the most relevant information efficiently. Because the amount of information on the Internet is enormous, it is important that a search engine ranks the information appropriately when it presents search results to users. Latent Semantic Indexing (LSI) addresses relevance ranking based on how significant a search word is in each document. Some innovative approaches of computing higher dimensional LSI (HD-LSI) were explored in this project. In traditional LSI, the term frequency-inverse document …

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Scalable Energy-Efficient Routing In Mobile Ad Hoc Network, Rashmi Kukanur

Master's Projects

The quick deployment without any existing infrastructure makes mobile ad hoc networks (MANET) a striking choice for dynamic situations such as military and rescue operations, disaster recovery, and so on and so forth. However, routing remains one of the major issues in MANET due to the highly dynamic and distributed environment. Energy consumption is also a significant issue in ad hoc networks since the nodes are battery powered. This report discusses some major dominating set based approaches to perform energy efficient routing in mobile ad hoc networks. It also presents the performance results for each of these mentioned approaches in …

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Geometry-Based Detection Of Flash Worms, Sang Soo Kim

Master's Projects

While it takes traditional internet worms hours to infect all the vulnerable hosts on the Internet, a flash worm takes seconds. Because of the rapid rate with which flash worms spread, the existing worm defense mechanisms cannot respond fast enough to detect and stop the flash worm infections. In this project, we propose a geometric-based detection mechanism that can detect the spread of flash worms in a short period of time. We tested the mechanism on various simulated flash worm traffics consisting of more than 10,000 nodes. In addition to testing on flash worm traffics, we also tested the mechanism …

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Clustering High Dimensional Data Using Svm, Tam P. Ngo

Master's Projects

The Web contains massive amount of documents from across the globe to the point where it has become impossible to classify them manually. This project’s goal is to find a new method for clustering documents that are as close to humans’ classification as possible and at the same time to reduce the size of the documents. This project uses a combination of Latent Semantic Indexing (LSI) with Singular Value Decomposition (SVD) calculation as well as Support Vector Machine (SVM) classification. With SVD, data sets are decomposed and can be truncated to reduce the data sets size. The reduced data set …

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Automated Peak Identification For Time -Of -Flight Mass Spectroscopy, Haijian Chen

Dissertations, Theses, and Masters Projects

The high throughput capabilities of protein mass fingerprints measurements have made mass spectrometry one of the standard tools for proteomic research, such as biomarker discovery. However, the analysis of large raw data sets produced by the time-of-flight (TOF) spectrometers creates a bottleneck in the discovery process. One specific challenge is the preprocessing and identification of mass peaks corresponding to important biological molecules. The accuracy of mass assignment is another limitation when comparing mass fingerprints with databases.;We have developed an automated peak picking algorithm based on a maximum likelihood approach that effectively and efficiently detects peaks in a time-of-flight secondary ion …

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Real -Time Retinex Image Enhancement: Algorithm And Architecture Optimizations, Glenn Derrick Hines

Dissertations, Theses, and Masters Projects

The field of digital image processing encompasses the study of algorithms applied to two-dimensional digital images, such as photographs, or three-dimensional signals, such as digital video. Digital image processing algorithms are generally divided into several distinct branches including image analysis, synthesis, segmentation, compression, restoration, and enhancement. One particular image enhancement algorithm that is rapidly gaining widespread acceptance as a near optimal solution for providing good visual representations of scenes is the Retinex.;The Retinex algorithm performs a non-linear transform that improves the brightness, contrast and sharpness of an image. It simultaneously provides dynamic range compression, color constancy, and color rendition. It …

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Spectroscopy, Production And Decays Of Pentaquarks, Herry Kwee

Dissertations, Theses, and Masters Projects

An extensive study of the production, decay and spectroscopy of pentaquarks has been done in this dissertation. at the time of this writing, the existence of the pentaquark has not been conclusively established. New experimental results for the pentaquark will come in the months ahead. A brief review of the current experimental status of the pentaquark is given in the Introduction. The pentaquark states are analyzed using the constituent quark model with the lowest-lying pentaquark multiplet shown to be an antidecuplet. The mass splittings within the antidecuplet emerge from spin-color and spin-flavor interactions between constituents and from hidden strangeness in …

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Optical Characterization Of Ferromagnetic Heterostructure *Interfaces And Thin Films, Haibin Zhao

Dissertations, Theses, and Masters Projects

This thesis presents optical characterizations of interfaces in ferromagnetic heterostructures and thin films used for spin polarized electronic devices. In these experiments, femtosecond laser spectroscopies are exploited to investigate the interface magnetization reversal, spin precession, and band offset, which are crucial in determining the performances of spintronic devices.;First, magnetization-induced second-harmonic-generation (MSHG) is applied to study interface magnetism in a hybrid structure containing a noncentrosymmetric semiconductor---Fe/AlGaAs. The reversal process of Fe interface layer magnetization is compared with the bulk magnetization reversal. In Fe/AlGaAs (001), the interface magnetization is found to be decoupled from the bulk magnetization based on the different switching …

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Studies In Cpt Violation And 331 Models, David L. Anderson

Dissertations, Theses, and Masters Projects

The Standard Model of particles and fields has been around for about 30 years, and has been remarkably successful. However, it is widely believed to be incomplete, and theorists have studied various extensions to the model. These extensions can take many forms. An example of this is the framework Colladay and Kostelecky have proposed for studying Lorentz and CPT violation in a natural extension of the Standard Model. We determined the first bounds on the parameters in the Higgs sector. The bounds on the CPT---even asymmetric coefficients arise from the one-loop contributions to the photon propagator, those from the CPT---even …

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Passive Available Bandwidth: Applying Self -Induced Congestion Analysis Of Application-Generated Traffic, Marcia Zangrilli Bryan

Dissertations, Theses, and Masters Projects

Monitoring end-to-end available bandwidth is critical in helping applications and users efficiently use network resources. Because the performance of distributed systems is intrinsically linked to the performance of the network, applications that have knowledge of the available bandwidth can adapt to changing network conditions and optimize their performance. A well-designed available bandwidth tool should be easily deployable and non-intrusive. While several tools have been created to actively measure the end-to-end available bandwidth of a network path, they require instrumentation at both ends of the path, and the traffic injected by these tools may affect the performance of other applications on …

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Internal Magnetic Field Distribution Of A Type Ii High Tc Superconductor With Non-Conducting Inclusions, Yuxin Dai

Dissertations, Theses, and Masters Projects

The internal magnetic field distributions for a type II superconductor (a single crystal YBa2Cu3O7-delta ) with large normal inclusions (YBa2Cu3O 7-delta) are studied. A model based on the London Equations has been successfully developed and applied to the interpretation of the pSR data on this system. In our model, these inclusions are assumed to be cylindrical in shape and infinite in length. Therefore, this model should be especially appropriate for the prediction of field distributions in single crystal superconductors in which columnar defects have been purposely introduced to enhance pinning.;muSR experiments on a large single-crystal sample of YBa2C u3O7-delta with …

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Static And Ultrafast Moke Studies Of Exchange -Biased Cobalt Systems, Keoki A. Seu

Dissertations, Theses, and Masters Projects

We have studied the exchange bias interaction in metal bilayers IrMn/Co and FeMn/Co using the static and ultrafast pump-probe Kerr effects. Experiments conducted on wedged Co samples show that the exchange bias interaction is sensitive to the buffer layers grown beneath it when the antiferromagnetic layer is FeMn. The exchange bias strength, as measured by the shift in the magnetic hysteresis loop, follows a 1/tFM dependence as reported in the literature. The time-domain pump-probe experiments reveal coherent magnetization oscillations, whose frequencies are comparable to those measured by frequency-domain FMR measurements, and they fit well to FMR equations for the frequency. …

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Uv Cure Kinetics Of Dimethacrylate Thin And Thick Samples, Yuemei Zhang

Dissertations, Theses, and Masters Projects

UV curing is using UV light as the energy source to induce the polymerization of liquid monomers and oligomers to form a solid polymer. Because UV polymerization is fast and energy-saving and a UV curable system has no VOC (volatile organic compound), this new technology has developed rapidly from thin film applications to thick sample applications. In addition, since the UV cure process can be controlled spatially and temporally, it also has an important application to make gradient materials with locally optimized properties. However, most research on UV cure is based on thin film applications, and the cure kinetics of …

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The Effect Of Workload Dependence In Systems: Experimental Evaluation, Analytic Models, And Policy Development, Qi Zhang

Dissertations, Theses, and Masters Projects

This dissertation presents an analysis of performance effects of burstiness (formalized by the autocorrelation function) in multi-tiered systems via a 3-pronged approach, i.e., experimental measurements, analytic models, and policy development. This analysis considers (a) systems with finite buffers (e.g., systems with admission control that effectively operate as closed systems) and (b) systems with infinite buffers (i.e., systems that operate as open systems).;For multi-tiered systems with a finite buffer size, experimental measurements show that if autocorrelation exists in any of the tiers in a multi-tiered system, then autocorrelation propagates to all tiers of the system. The presence of autocorrelated flows in …

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Carbon Nanosheets And Carbon Nanotubes By Rf Pecvd, Mingyao Zhu

Dissertations, Theses, and Masters Projects

A planar antenna RF plasma enhanced chemical vapor deposition apparatus was built for carbon nanostructure syntheses. When operated in inductive and capacitive plasma discharging modes, two carbon nanostructures, carbon nanotube (CNT) and carbon nanosheet (CNS), were synthesized, respectively.;A nanosphere lithography method was developed and used to prepare catalyst patterns for CNT growth. Using capacitively coupled C2H2/NH 3 plasma, randomly oriented CNT were synthesized on Ni dot patterned Si substrates. Aligned CNT arrays were grown on SiO2 coated Si substrates, using both C2H2/NH3 and CH 4/H2 capacitive plasmas.;When operated in inductive coupling mode, CNS were successfully deposited on a variety of …

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A Normal-Mixture Model With Random-Effects For Rr-Interval Data, Jessica Mckinney Ketchum

Theses and Dissertations

In many applications of random-effects models to longitudinal data, such as heart rate variability (HRV) data, a normal-mixture distribution seems to be more appropriate than the normal distribution assumption. While the random-effects methodology is well developed for several distributions in the exponential family, the case of the normal-mixture has not been dealt with adequately in the literature. The models and the estimation methods that have been proposed in the past assume the conditional model (fixing the random-effects) to be normal and allow a mixture distribution for the random effects (Xu and Hedeker, 2001, Xu, 1995). The methods proposed in this …

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Growing A Better Food System: An Analysis Of The Impact Of California School Gardens On The Sustainable Food And Food Security Movements, Michael Press

Pomona Senior Theses

In recent decades, environmental problems associated with conventional agriculture, children’s nutrition, and concern over the adequacy of the current food supply have led to the emergence of the sustainable food and food security movements. These issues have also inspired the state of California to pass legislation to place a garden in every school in the state. This thesis analyzes the accuracy of this policy’s implementation and its effects on the sustainable food and food security movements. Research found that the loss of state funding for this policy and the administrative, logistical, and informational barriers to establishing garden education programs has …

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Time-Resolved Magneto-Optical Imaging Of Superconducting Ybco Thin Films In The High-Frequency Ac Current Regime, Alexander Frey

Dissertations, Theses, and Masters Projects

No abstract provided.

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Physical Processes Behind Delta Propagation And Flood Layer Dynamics, Po River, Italy, Aaron J. Bever

Dissertations, Theses, and Masters Projects

Rivers discharge around 20 billion tonnes of sediment to the coastal ocean each year (Milliman and Syvitski, 1992). Many supply dominated rivers possess large subareal and subaqueous deltas, whose growth depends on the physical processes controlling sediment deposition or removal. There has yet to be a complete understanding of how short term processes such as settling from buoyant plumes, wave/current resuspension, and transport by currents and gravity flows, interact to produce the depositional products that develop over varying timescales. The Po River in Northern Italy forms a substantial delta in the Adriatic Sea. It has five distributary mouths, and is …

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Full-Text Articles in Physical Sciences and Mathematics

Role Of Apolipoprotein A-1 In Defense Against Bacteria By Striped Bass (Morone Saxatilis), L. Danielle Johnston

Dissertations, Theses, and Masters Projects

A Molecular Technique For Specific Identification Of Western Atlantic Ocean Scombrids And An Analysis Of A Larval Scombrid Assemblage Off The Kona Coast Of Hawaii, Melissa A. Paine

Dissertations, Theses, and Masters Projects

Physiological Consequences Of High Water Flow On The Coral Montastrea Annularis (Ellis And Solander, 1786), Lawrence W. Carpenter

Dissertations, Theses, and Masters Projects

Developing A Stock Assessment For The Barndoor Skate (Dipturus Laevis) In The Northeast United States, Todd Gedamke

Dissertations, Theses, and Masters Projects

Development Of An Unstructured Grid, Finite Volume Eutrophication Model For The Shallow Water Coastal Bay: Application In The Lynnhaven River Inlet System, Yuepeng Li

Dissertations, Theses, and Masters Projects

Meta-Analysis Of Open Vs Closed Surgery Of Mandibular Condyle Fractures, Marcy Lauren Nussbaum

Theses and Dissertations

Sediment Biogeochemistry Of Northern Cascadia Margin Shallow Gas Hydrate Systems, John W. Pohlman

Dissertations, Theses, and Masters Projects

Visualization Of Secondary Rna Structure Prediction Algorithms, Brandon Hunter

Master's Projects

Concept Based Document Clustering Using A Simplicial Complex, A Hypergraph, Kevin Lind

Master's Projects

Compact Representation Of Association Rule, Mien K. Siao

Master's Projects

A Meaningful Md5 Hash Collision Attack, Narayana D. Kashyap

Master's Projects

Automatic Extraction Of Keywords And Co-Occurrence Keyword Sets, Mong-Hang Vo

Master's Projects

Scalable Energy-Efficient Routing In Mobile Ad Hoc Network, Rashmi Kukanur

Master's Projects

Geometry-Based Detection Of Flash Worms, Sang Soo Kim

Master's Projects

Clustering High Dimensional Data Using Svm, Tam P. Ngo

Master's Projects

Automated Peak Identification For Time -Of -Flight Mass Spectroscopy, Haijian Chen

Dissertations, Theses, and Masters Projects

Real -Time Retinex Image Enhancement: Algorithm And Architecture Optimizations, Glenn Derrick Hines

Dissertations, Theses, and Masters Projects

Spectroscopy, Production And Decays Of Pentaquarks, Herry Kwee

Dissertations, Theses, and Masters Projects

Optical Characterization Of Ferromagnetic Heterostructure *Interfaces And Thin Films, Haibin Zhao

Dissertations, Theses, and Masters Projects

Studies In Cpt Violation And 331 Models, David L. Anderson

Dissertations, Theses, and Masters Projects

Passive Available Bandwidth: Applying Self -Induced Congestion Analysis Of Application-Generated Traffic, Marcia Zangrilli Bryan

Dissertations, Theses, and Masters Projects

Internal Magnetic Field Distribution Of A Type Ii High Tc Superconductor With Non-Conducting Inclusions, Yuxin Dai

Dissertations, Theses, and Masters Projects

Static And Ultrafast Moke Studies Of Exchange -Biased Cobalt Systems, Keoki A. Seu

Dissertations, Theses, and Masters Projects

Uv Cure Kinetics Of Dimethacrylate Thin And Thick Samples, Yuemei Zhang

Dissertations, Theses, and Masters Projects

The Effect Of Workload Dependence In Systems: Experimental Evaluation, Analytic Models, And Policy Development, Qi Zhang

Dissertations, Theses, and Masters Projects

Carbon Nanosheets And Carbon Nanotubes By Rf Pecvd, Mingyao Zhu

Dissertations, Theses, and Masters Projects

A Normal-Mixture Model With Random-Effects For Rr-Interval Data, Jessica Mckinney Ketchum

Theses and Dissertations

Growing A Better Food System: An Analysis Of The Impact Of California School Gardens On The Sustainable Food And Food Security Movements, Michael Press

Pomona Senior Theses

Time-Resolved Magneto-Optical Imaging Of Superconducting Ybco Thin Films In The High-Frequency Ac Current Regime, Alexander Frey

Dissertations, Theses, and Masters Projects

Physical Processes Behind Delta Propagation And Flood Layer Dynamics, Po River, Italy, Aaron J. Bever

Dissertations, Theses, and Masters Projects