Digital Commons Network^™

Abundance Of Eukaryotic Microbes In The Deep Subtropical North Atlantic, Danielle Morgan-Smith, Gerhard J. Herndl, Hendrik M. Van Aken, Alexander B. Bochdansky

OES Faculty Publications

The meso- and bathypelagic ocean comprises the largest habitat on earth, yet we know very little about the distribution and activity of protists in this environment. These small eukaryotes are responsible for controlling bacterial abundance in the surface ocean and are major players in the material and energy transfer of pelagic food webs. In this paper, we quantify microbial eukaryotes in the deep North Atlantic, as well as provide a basic characterization of eukaryote community changes through the water column. To this end, we counted organisms using 2 different approaches: (1) catalyzed reporter deposition fluorescence in situ hybridization (CARD-FISH, also …

Cascading Migrations And Implications For Vertical Fluxes In Pelagic Ecosystems, Stephen M. Bollens, Gretchen Rollwagen-Bollens, Joel A. Quenette, Alexander B. Bochdansky

OES Faculty Publications

Diel vertical migration is widespread across diverse taxa in the world's lakes and seas, yet its biogeochemical consequences are still poorly understood. The biologically mediated vertical flux of material in the ocean (also known as the "biological pump") is a matter of major interest and concern, as it is thought to play an important role in regulating ocean carbon storage, and by extension, the global carbon cycle. Recent studies spanning multiple trophic levels from fish to dinoflagellates have led us to a concept of coupled vertical migrations that we refer to as "cascading migrations". That is, migrations that …

Modern Dirty Sea Ice Characteristics And Sources: The Role Of Anchor Ice, Dennis A. Darby, Wesley B. Myers, Martin Jakobsson, Ignatius Rigor

OES Faculty Publications

Extensive dirty ice patches with up to 7 kg m^-2 sediment concentrations in layers of up to 10 cm thickness were encountered in 2005 and 2007 in numerous areas across the central Arctic. The Fe grain fingerprint determination of sources for these sampled dirty ice floes indicated both Russian and Canadian sources, with the latter dominating. The presence of benthic shells and sea weeds along with thick layers (2-10 cm) of sediment covering 5-10 m² indicates an anchor ice entrainment origin as opposed to suspension freezing for some of these floes. The anchor ice origin might explain the …

Draft Genome Sequence Of Strain Himb100, A Cultured Representative Of The Sar116 Clade Of Marine Alphaproteobacteria, Jana Grote, Cansu Bayindirli, Kristin Bergauer, Paula C. De Moraes, Huan Chen, Lindsay D'Ambrosio, Bethany Edwards, Beatriz Fernandez-Gomez, Mariam Hamisi, Dan Nguyen, Yoshimi M. Rii, Emily Saeck, Charles Schutte, Brittany Widner

OES Faculty Publications

Strain HIMB100 is a planktonic marine bacterium in the class Alphaproteobacteria. This strain is of interest because it is one of the first known isolates from a globally ubiquitous clade of marine bacteria known as SAR116 within the family Rhodospirillaceae. Here we describe preliminary features of the organism, together with the draft genome sequence and annotation. This is the second genome sequence of a member of the SAR116 clade. The 2,458,945 bp genome contains 2,334 protein-coding and 42 RNA gene

Evidence From The Florida Straits For Younger Dryas Ocean Circulation Changes, Jean Lynch-Stieglitz, Matthew W. Schmidt, William B. Curry

OES Faculty Publications

The waters passing through the Florida Straits today reflect both the western portion of the wind-driven subtropical gyre and the northward flow of the upper waters which cross the equator, compensating North Atlantic Deep Water export as part of the large-scale Atlantic meridional overturning circulation. It has been postulated from various lines of evidence that the overturning circulation was weaker during the Younger Dryas cold event of the last deglaciation. We show here that the contrast in the oxygen isotopic composition of benthic foraminiferal tests across the Florida Current is reduced during the Younger Dryas. This most likely reflects a …

Meridional Shifts In The Marine Itcz And The Tropical Hydrologic Cycle Over The Last Three Glacial Cycles, Matthew W. Schmidt, Howard J. Spero

OES Faculty Publications

Paleoproxy studies show a strong correlation between tropical climate and high-latitude temperature variability recorded in the Greenland ice cores over the last glacial cycle. In particular, abrupt cooling events in the Greenland Ice Sheet Project II δ¹⁸O ice record appear synchronous with a southward migration of the Intertropical Convergence Zone (ITCZ) in the Atlantic, a weakening of the Indian and East Asian monsoon systems, and a strengthening of the South American monsoon system. Because this high-to-low-latitude climate teleconnection significantly alters the tropical hydrologic cycle around the globe, it plays a critical role in regulating global climate on glacial-interglacial …

Florida Straits Deglacial Temperature And Salinity Change: Implications For Tropical Hydrologic Cycle Variability During The Younger Dryas, Matthew W. Schmidt, Jean Lynch-Stieglitz

OES Faculty Publications

The prevailing paradigm of abrupt climate change holds that rapid shifts associated with the most extreme climate swings of the last glacial cycle were forced by changes in the strength and northward extension of Atlantic Meridional Overturning Circulation (AMOC), resulting in an abrupt reorganization of atmospheric circulation patterns with global teleconnections. To determine the timing of tropical Atlantic atmospheric circulation changes over the past 21 ka BP, we reconstruct high resolution sea surface temperature and δ¹⁸O_SW (a proxy for surface salinity) records based on Mg/Ca ratios and oxygen isotope measurements in the planktonic foraminifera Globigerinoides ruber from …

Lithospheric Control On The Spatial Pattern Of Azores Hotspot Seafloor Anomalies: Constraints From A Model Of Plume-Triple Junction Interaction, Jennifer E. Georgen

OES Faculty Publications

The Azores hotspot is located near a plate boundary triple junction (TJ) consisting of the Terceira Rift (TER) and two branches of the Mid-Atlantic Ridge (MAR). The seafloor expression of the Azores hotspot has a complex spatial pattern. Latitudinal anomalies in seafloor depth and other data along the MAR extend farther to the south of the inferred location of the mantle heterogeneity than to the north. Longitudinal anomalies span a greater distance to the east of the MAR (along the TER) than to the west. A finite element model is used to investigate how the divergence of three plates away …

Discrimination Of Surface And Volume States In Fully Depleted Field-Effect Devices On Thick Insulator Substrates, Robert Manley

Theses

The behavior of electronic devices fabricated on thin, lightly doped semiconductor layers can be significantly influenced by very low levels of non-ideal charge states. Such devices typically operate in a fully depleted mode, and can exhibit significantly different electrical properties and characteristics than their bulk material counterparts. Traditional interpretation of device characteristics may identify the existence of such non-idealities, but fail to ascertain if the origin is from within the semiconductor layer or associated with the interfaces to adjacent dielectric materials. This leads to ambiguity in how to rectify the behavior and improve device performance. Characterizing non-idealities through electrical means …

Real-Time Traffic Estimation Using Data Expansion, Roger Lederman, Laura Wynter

Research Collection School Of Computing and Information Systems

This paper presents a method for estimating missing real-time traffic volumes on a road network using both historical and real-time traffic data. The method was developed to address urban transportation networks where a non-negligible subset of the network links do not have real-time link volumes, and where that data is needed to populate other real-time traffic analytics. Computation is split between an offline calibration and a real-time estimation phase. The offline phase determines link-to-link splitting probabilities for traffic flow propagation that are subsequently used in real-time estimation. The real-time procedure uses current traffic data and is efficient enough to scale …

Method For Rounded-Leaf Offset Definition On A Medical Linear Accelerator, Brandon Cole Mader

Theses

No abstract provided.

An Empirical Study Of Software Changes In Open Source Systems, Deel M. Baral

Theses

No abstract provided.

Dsp Implementation And Study Of Sliding Mode Control Algorithms For Power Factor Correction In Ac-Dc Converters, Elise Goff

Theses

No abstract provided.

Surface Plasmon Modes Of Curved Thin Metal Films And Curved Cylindrical Metal Nanowires, Hideaki Yamamoto

Theses

No abstract provided.

Stock-Out As It Relates To An Army Supply Chain : An Analysis Of Causes And Trends, Lucas Neidert

Theses

No abstract provided.

A Methodology For The Uncertainty Quantification And Sensitivity Analysis Of Turbulence Model Coefficients, Matthew C. Dunn

Theses

No abstract provided.

An Empirical Study And Modeling On Selected Analog Circuits Using A Metal-Ferroelectric-Semiconductor Field Effect Transistor, Mitchell Ryan Hunt

Theses

No abstract provided.

The Design State Space For Software Metrics Extraction And Analysis, Raouf Alomainy

Theses

No abstract provided.

Line And Circle Clipping Based On High Performance Gpgpu And Multithreaded Computing, Shailesh Khot

Theses

No abstract provided.

Gamte Program Fall 2011, Gamte

Georgia Association of Mathematics Teacher Educators (GAMTE) Annual Conference (2007-2019)

N/A

Editorial: Special Issue On Ubiquitous Electronic Commerce Systems, Robert H. Deng, Jari Veijalainen, Shiguo Lian, Dimitris Kanellopoulos

Research Collection School Of Computing and Information Systems

Ubiquitous computing is a post-desktop model of human-computer interaction in which information processing has been thoroughly integrated into everyday objects and activities. Emerging ubiquitous electronic commerce systems (UECS) are expected to be available anytime, anywhere, and using different official or personal computing devices. Systems and services such as digital libraries, on-line business transactions, mobile office and mobile TV are widely deployed. Users will be able to access these services anytime, anywhere, while using any computing device in a pervasive way.

Instance-Based Parameter Tuning Via Search Trajectory Similarity Clustering, Linda Lindawati, Hoong Chuin Lau, David Lo

Research Collection School Of Computing and Information Systems

This paper is concerned with automated tuning of parameters in local-search based meta-heuristics. Several generic approaches have been introduced in the literature that returns a ”one-size-fits-all” parameter configuration for all instances. This is unsatisfactory since different instances may require the algorithm to use very different parameter configurations in order to find good solutions. There have been approaches that perform instance-based automated tuning, but they are usually problem-specific. In this paper, we propose CluPaTra, a generic (problem-independent) approach to perform parameter tuning, based on CLUstering instances with similar PAtterns according to their search TRAjectories. We propose representing a search trajectory as …

Fine-Tuning Algorithm Parameters Using The Design Of Experiments Approach, Aldy Gunawan, Hoong Chuin Lau, Linda Lindawati

Research Collection School Of Computing and Information Systems

Optimizing parameter settings is an important task in algorithm design. Several automated parameter tuning procedures/configurators have been proposed in the literature, most of which work effectively when given a good initial range for the parameter values. In the Design of Experiments (DOE), a good initial range is known to lead to an optimum parameter setting. In this paper, we present a framework based on DOE to find a good initial range of parameter values for automated tuning. We use a factorial experiment design to first screen and rank all the parameters thereby allowing us to then focus on the parameter …

Different Strokes For Different Folks: A Different Standard Is Not Inherently A Double Standard, James E. Coleman Jr.

Faculty Scholarship

During the Senate’s closed confirmation hearings on President Dwight D. Eisenhower’s nomination of George E. Wilson, President of General Motors, to be Secretary of Defense, a senator asked Wilson if he would be able to make decisions as Secretary of Defense that were adverse to General Motors’ interest. Wilson replied that he would, but added he could not imagine having to make such a choice because “[f]or years I thought what was good for the country was good for General Motors and vice versa.” This bit of rhetorical bromide was reported erroneously by the press, which had been excluded from …

Mining Event Structures From Web Videos, Xiao Wu, Yi-Jie Lu, Qiang Peng, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

The article is discussing the issues of mining event structures from Web video search results using text analysis, burst detection, and clustering as with the proliferation of social media, the volume of Web videos have grown exponentially.

Anaplasmataceae As Human Pathogens : Biology, Ecology And Epidemiology, Marina E. Eremeeva, Gregory A. Dasch

Environmental Health Sciences: Faculty Publications

This review describes the biology, ecology, and epidemiology of known human pathogens in the family Anaplasmataceae that are transmitted by ticks and belong to the genus Anaplasma and genus Ehrlichia. We discuss the current status of diagnosis and surveillance of the diseases they cause, and address the challenges and new perspectives raised due to continuous recognition of new emerging human pathogens in the family Anaplasmataceae.

Archival Methods And The Veil Of Sociology, Mary Jo Deegan

Department of Sociology: Faculty Publications

Archival methods of research are crucial to reconstruct. interpret. and evaluate contributions of early sociologists that are hidden behind the veiIs of racism and sexism. Many of these founding sociologists profoundly shaped their communities and created important organizations to combat social inequality and injustice. Their lives as intellectuals were frequently controversial. which made them political anathemas to mainstream sociologists, usually white males working in prestigious universities who wanted money. fame, and prestige for the new discipline and its leaders.

In this chapter, [recount how r began a career using historical research to understand the rich. alternative history of the profession. …

Heterogeneity And Its Impact On Thermal Robustness And Attractor Density, Yuri Cantor, Bilal Khan, Kirk Dombrowski

Department of Sociology: Faculty Publications

There is considerable research relating the structure of Boolean networks to their state space dynamics. In this paper, we extend the standard model to include the effects of thermal noise, which has the potential to deflect the trajectory of a dynamical system within its state space, sending it from one stable attractor to another. We introduce a new “thermal robustness” measure, which quantifies a Boolean network’s resilience to such deflections. In particular, we investigate the impact of structural homogeneity on two dynamical properties: thermal robustness and attractor density. Through computational experiments on cyclic Boolean networks, we ascertain that as a …

The Impact Of A Wave Farm On Large Scale Sediment Transport, R Gonzalez Santamaria, Qp Zou, S Pan

School of Engineering, Computing and Mathematics

This study investigates the interactions of waves and tides at a wave farm in the southwest of England, in particular their effects on radiation stress, bottom stress, and consequently on the sediment transport and the coast adjacent to the wave-farm (the Wave Hub). In this study, an integrated complex numerical modelling system is setup at the Wave Hub site and is used to compute the wave and current fields by taking into account the wave-current interaction, as well as the sediment transport. Results show that tidal elevation and tidal currents have a significant effect on the wave height and direction …

Are We Missing Opportunities To Encourage Interest In Stem Fields?, Cathy Hall, Jeremy Dickerson, David Batts, Paul Kauffmann, Michael Bosse

Teacher Education

No abstract provided.