Other Physical Sciences and Mathematics Commons^™

Longitudinal Case-Control Study Of Mammographic Breast Tissue Subtypes, Kendra Batchelder

Electronic Theses and Dissertations

Breast density is a known risk factor for breast cancer. However, there has been limited research on potential subtypes of mammographic dense breast tissue to identify areas of active dense tissue that is structurally reorganizing and links to cancer dynamics, versus areas of passive dense tissue which remains organized. We hypothesize that the amounts of subtypes of mammographic dense tissue and the associated rate of change through time could provide insights into breast cancer risk. A retrospective study was conducted to investigate breast cancer using longitudinal screening mammograms and accompanying pathology reports collected in 2015. Patients were matched by age …

Development And Applications Of Similarity Measures For Spatial-Temporal Event And Setting Sequences, Fuyu Xu

Electronic Theses and Dissertations

Similarity or distance measures between data objects are applied frequently in many fields or domains such as geography, environmental science, biology, economics, computer science, linguistics, logic, business analytics, and statistics, among others. One area where similarity measures are particularly important is in the analysis of spatiotemporal event sequences and associated environs or settings. This dissertation focuses on developing a framework of modeling, representation, and new similarity measure construction for sequences of spatiotemporal events and corresponding settings, which can be applied to different event data types and used in different areas of data science. The first core part of this dissertation …

Survey Control With Gnss Receiver: Wpes, How Do I...? Quick Guide, Bea E. Van Dam

Non-Thesis Student Work

This document is a quick guide to establishing survey control points using a Global Navigation Satellite Systems (GNSS) receiver and processing collected point coordinate data.

The WPES Research Group uses a Trimble NetR9 GNSS reference receiver, which is reflected in the specific sequences of button presses outlined in the data profile setup, field operation, and data download sections. Readers using a different receiver may still find the general workflow overview useful and should be able to use the data post-processing section directly.

Understanding Volume Transport In The Jordan River: An Application Of The Navier-Stokes Equations, Gwyneth E. Roberts

Honors College

This study aims to characterize the circulation patterns in short and narrow estuarine systems on various temporal scales to identify the controls of material transport. In order to achieve this goal, a combination of in situ collected data and analytical modeling was used. The model is based on the horizontal Reynolds Averaged Navier-Stokes equations in the shallow water limit with scaling parameters defined from the characteristics of the estuary. The in situ measurements were used to inform a case study, seeking to understand water level variations and tidal current velocity patterns in the Jordan River and to improve understanding of …

Climatic Range Filling Of North American Trees, Benjamin Seliger

Electronic Theses and Dissertations

Understanding the degree to which species distributions are controlled by climate is crucial for forecasting biodiversity responses to climate change. Climatic equilibrium, when species are found in all places which are climatically suitable, is a fundamental assumption of species distribution models, but there is evidence in support of climate disequilibria in species ranges. Long-lived, sessile organisms such as trees may be especially vulnerable to being outpaced by climate change, and thus prone to disequilibrium. In this dissertation, I tested the degree to which North American trees are in equilibrium with their potential climatic ranges using the ‘range filling’ metric, which …

Three-Dimensional Bedrock Channel Evolution With Smoothed Particle Hydrodynamics, Nick Richmond

Electronic Theses and Dissertations

Bedrock channels are responsible for balancing and communicating tectonic and climatic signals across landscapes, but it is difficult and dangerous to observe and measure the flows responsible for removing weakly-attached blocks of bedrock from the channel boundary. Consequently, quantitative descriptions of the dynamics of bedrock removal are scarce. Detailed numerical simulation of violent flows in three dimensions has been historically challenging due to technological limitations, but advances in computational fluid dynamics aided by high-performance computing have made it practical to generate approximate solutions to the governing equations of fluid dynamics. From these numerical solutions we gain detailed knowledge of the …

Information And Data Management Program's Pi Workshop, Peggy Agouris

University of Maine Office of Research Administration: Grant Reports

The objective of this workshop is to bring together the PIs and Co-PIs currently funded by the Information and Data Management Program of the National Science Foundation to discuss and exchange ideas on the focus topics of their field, as well as to identify and elaborate on emerging themes and particular emphases for future activities.

More specifically, the researchers, along with selected industry and government invitees, cooperatively focused on:

(1) analyzing research and development issues fundamental in making progress towards new challenges imposed by such diverse data sources as the Internet, embedded and distributed sensors, and satellites;

(2) specifying areas …

Control Of Denitrification In A Permanently Ice Covered Antarctic Lake: Potential For Regulation By Bioactive Metals, Mark Wells

University of Maine Office of Research Administration: Grant Reports

Lake Bonney is a permanently ice-covered lake in the Dry ValleyÆs region of Antarctica separated into two deep lobes by a shallow (12 m) sill. Denitrification occurs in the sub-oxic, saline waters of the west lobe but not in that of the east lobe for reasons unknown. Previous work has established this disparity cannot be attributed to temperature or salinity limitations, nor by the comparative availability of organic carbon substrates. Our research objective is to determine if trace metal limitation or toxicity may be responsible for this unusual feature. The broader objective is to assess the likelihood that denitrification in …

Daniel Wolfman, 1939-1994, Izumi Shimada

Andean Past

No abstract provided.