Physical Sciences and Mathematics Commons^™

Prototype Automated Flow-Through Sensor For Measuring Waterborne Microbial Concentrations Using Bulk Fluorescence, Susan M. Savill

Graduate Masters Theses

Timely and inexpensive monitoring of microbial ecology in the world's water supplies is crucial to the study of environmental and human impact on water quality and the prevention of disease outbreaks. Current technology is lacking in its ability to accurately measure and predict the presence of possible disease pathogens in a timely and cost effective manner. This paper describes the construction and initial testing of an automated prototype water sensor intended to detect fluctuations in microbial density in real-time by using bulk fluorescence of SYBR Gold stained bacteria. The sensor is comprised of off-the-shelf hardware and an in-house designed and …

Precisely Serializable Snapshot Isolation, Stephen Anthony Revilak

Graduate Doctoral Dissertations

Snapshot Isolation (SI) is a method of database concurrency control that uses timestamps and multiversioning, in preference to pessimistic locking. Since its introduction in 1995, SI has become a popular isolation level, and has been implemented in a variety of database systems: Oracle, Postgres, Microsoft SQL Server, and others. Despite the benefits that SI offers, one of the things it cannot provide is serializability. Past approaches for serializable SI have focused on avoiding dangerous structures (or essential dangerous structures). Dangerous structures are patterns of transaction dependencies that indicate the potential for a non-serializable execution; however, the presence of dangerous structures …

Multicomponent Reactions For The Preparation Of Fluorous Taged Pyrimidines And Thiopyrimidines And Their Derivatisation To Obtain Biaryl-Substituted Heterocycles, Bruno Piqani

Graduate Masters Theses

This thesis presents a work in the field of multicomponent reactions (MCRs), one-step condensation between a fluorous tagged aldehyde, β-keto ester and urea derivatives. This process in literature is known as "Biginelli Reaction". This dissertation describes a new Biginelli reaction element, using fluorous component as a limiting agent.

Chapter one is an introduction of MCRs. A brief historical review, key principles as well as applications in different fields such as academic research, synthetic organic chemistry, and medicinal applications are presented.

Chapter two discusses the general features of the Biginelli reaction, microwave, and fluorous chemistry with a distinctive look from the …

Scaling Of Losses With Size And Wavelength In Nanoplasmonics And Metamaterials, Jacob B. Khurgin, Greg Sun

Physics Faculty Publications

We show that, for the resonant metal-dielectric structures with sub-wavelength confinement of light in all three dimensions, the loss cannot be reduced considerably below the loss of the metal itself unless one operates in the far IR and THz regions of the spectrum or below. Such high losses cannot be compensated by introducing gain due to Purcell-induced shortening of recombination times. The only way low loss optical meta-materials can be engineered is with, as yet unknown, low loss materials with negative permittivity.

Brief 2: Overcoming Fragmented Governance: The Case Of Climate Change And The Mdgs, Oran R. Young

Governance and Sustainability Issue Brief Series

Fragmented governance hampers efforts to address tightly coupled challenges, like coming to grips with climate change and fulfilling the Millennium Development Goals. The way forward is to launch programmatic initiatives focusing on adaptation to climate change and the transition to a green economy that appeal to many separate bodies as win-win opportunities.

Brief 1: Financing International Environmental Governance: Lessons From The United Nations Environment Programme, Maria Ivanova

Governance and Sustainability Issue Brief Series

Financing for the global environment is scattered among many institutions and, without an overview of total financial flows, often considered scarce. This issue brief begins an analysis of the financial landscape by focusing on the anchor institution for the global environment, the UN Environment Programme. It examines the relationship between institutional form and funding and offers insights into innovative financing.

Heterogeneity And Data Analysis, Peter J. Taylor

Working Papers on Science in a Changing World

This working paper is a discussion paper for a September 2011 meeting of the research group of Prof. Di Cook on data visualization and exploratory data analysis at Iowa State University. A taxonomy of eleven kinds of heterogeneity is presented, followed by a set of vignettes that illustrate some of the meanings and sketch some implications, then a series of images that illustrate the heterogeneities. Several of the vignettes speak to a broad contention about heterogeneity and control: In relation to modern understandings of heredity and development over the life course, research and application of resulting knowledge are untroubled by …

Heterogeneity, Control, Social Infrastructure, And Possibilities Of Participation: Their Interplay In Modern Understandings Of Heredity And In Interpretation Of Science, Peter J. Taylor

Working Papers on Science in a Changing World

This working paper is a prospectus for research, writing, and engagement. It consists of vignettes, sketches of lines of inquiry, and proposals for engagement, all of which concern modern understandings of heredity and development over the life course as well as the social interpretation of science. The various items address a range of areas of science and of its interpretation: heritability studies, the social uses of genetic information, gene-by-environment interaction, personalized medicine, IQ paradoxes, racial group membership, biobanks, and life events and difficulties research. Fresh perspectives in these areas are opened up by examining the ways that research and application …

Approach To Typicality In Quantum Systems, Shawn Dubey

Applied Physics Masters Theses Collection

The study of quantum mechanics has greatly broadened since its inception in the early twentieth century. Recent research has focused on the emergence of thermalization in quantum many-body systems. In this thesis I will demonstrate the approach to typicality--the notion that for specific sets of objects, most of the objects share a common property--in a single, many-body spins chain of spin half particles. This notion of typicality is new. But it serves as a good explanation for the emergence of thermalization.

2010 Massachusetts Recreational Boater Survey: Final Report Submitted To The Massachusetts Ocean Partnership, Dan Hellin, Jack Wiggin, Kristin Uiterwyk, Kim Starbuck, Nicholas Napoli, David Terkla, Chris Watson, Anthony Roman, Leona Roach, Tim Welch

Urban Harbors Institute Publications

The Massachusetts Ocean Management Plan (Plan) completed in 2009 recognized recreational boating as an activity with “significant actual and prospective conflicts among multiple waterway uses in Massachusetts” and included the economic value of recreational boating as a key socio-economic indicator that will be used to inform coastal management. At the time of Plan completion, statistically robust recreational boating data were identified as an important need for comprehensive ocean planning.

To fill this data gap, the 2010 Massachusetts Recreational Boater Survey gathered information on boating activity in Massachusetts’ coastal and ocean waters directly from recreational boaters. Researchers sent 10,000 surveys to …

The Implications Of Water Insecurity For Fragile And Failing States: The Case Of Pakistan, Jennifer Norins

Graduate Masters Theses

As we become more firmly established in the 21st century, the international system faces a number of increasingly more difficult challenges that pose threats to global security and human progress. Among these challenges, water scarcity and failing states have each received prominent attention in both the academic and policy realms. Water serves a number of critical purposes for human survival and socio-economic activity. The threat of water scarcity is becoming increasingly salient and the capacity of states to ensure water security, and other securities which water security supports, is being tested. Fragile and failing states also occupy significant space in …

Supersymmetric Origins Of The Properties Of Sech-Pulses And Sine-Gordon Solitons, Andrew Phillip Koller

Graduate Masters Theses

In this thesis, we show that the members of a class of reflectionless Hamiltonians, namely, Akulin's Hamiltonians, are connected via a supersymmetric (SUSY) chain. While the reflectionless property in question (vanishing reflection coefficients at all values of the spectral parameter, e.g. energy) has been mentioned in the literature for over two decades, the enabling algebraic mechanism was previously unknown. We show that the supersymmetric connection of the Akulin's Hamiltonians to a potential-free Hamiltonian is the origin of this property. As the first application for our findings, we show that the SUSY decomposition of Akulin's Hamiltonians explains a well-known effect in …

The Conservation And Habitat Ecology Of Antillean Manatees (Trichechus Manatus Manatus) In The Drowned Cayes Area Of Belize, Central America, Katherine Spencer Lacommare

Graduate Doctoral Dissertations

The Drowned Cayes area of Belize, Central America is regionally important for the conservation of Antillean manatees in the Caribbean (Lefebvre et al. 2001; Quintana-Rizzo & Reynolds 2008). These islands are increasingly threatened by human activities such as tourism, development and population growth. The objective of this dissertation is to evaluate manatee habitat use and status in this area. The 5 specific objectives are to examine manatee (1) distribution in the Drowned Cayes, (2) use of seagrass beds and forage selection, (3) resting habitat use and selection (4) response to disturbance, and (5) trends in abundance and to suggest a …

The Impact Of Modern Weathering On The Geochemistry Of A Marine Permo-Triassic Boundary Section, Jeremy Christopher Williams

Graduate Masters Theses

The Permian-Triassic Boundary (PTB) marks the end-Permian extinction, the greatest mass extinction recorded in Earth's history. The Attargoo PTB section located in Spiti Valley, Himachal Pradesh, India was situated along the north continental margin of Gondwana-land in the Neo-Tethys Ocean during the end-Permian extinction. In Spiti Valley, PTB sections such as Attargoo are exposed by a thin (~ 2cm) ferruginous layer separating the Permian black shale from Triassic Limestone. Studies that have presented geochemical data to support a theory of the end-Permian extinction lack any interpretation of post-depositional effects on Spiti Valley PTB sections. In order to accurately present a …

A Model For Relating Environmental Variation To Water Permit Violations At Thermoelectric Facilities, Seth Sheldon

Interdisciplinary Perspectives: a Graduate Student Research Showcase

A regression model is presented which relates cooling water withdrawal rates and discharge temperatures at two mid-size thermoelectric facilities to electricity demand and ambient air temperature using historical data. Both facilities employ open-loop cooling systems, which have substantial water demands. Open-loop facilities comprise roughly one third of U.S. generation capacity. High water demands put facilities and downstream aquatic habitats at risk during heat waves and droughts, and put facility managers in a position to decide between reducing their power generation and violating their permit limits. National Pollutant Discharge Elimination System (NPDES) permits place limits on cooling water withdrawals and effluent …

Super-Aggregations Of Krill And Humpback Whales In Wilhelmina Bay, Antarctic Peninsula, Douglas P. Nowacek, Ari S. Friedlaender, Patrick N. Halpin, Elliott L. Hazen, David W. Johnston, Andrew J. Read, Boris Espinasse, Meng Zhou, Yiwu Zhu

Environmental, Earth, and Ocean Sciences Faculty Publication Series

Ecological relationships of krill and whales have not been explored in the Western Antarctic Peninsula (WAP), and have only rarely been studied elsewhere in the Southern Ocean. In the austral autumn we observed an extremely high density (5.1 whales per km²) of humpback whales (Megaptera novaeangliae) feeding on a super-aggregation of Antarctic krill (Euphausia superba) in Wilhelmina Bay. The krill biomass was approximately 2 million tons, distributed over an area of 100 km² at densities of up to 2000 individuals m⁻³; reports of such ‘super-aggregations’ of krill have been absent in …

Optimization Of The Nanolens Consisting Of Coupled Metal Nanoparticles: An Analytical Approach, Greg Sun, Jacob B. Khurgin

Physics Faculty Publications

Using a simple and intuitive analytical approach, we perform optimization of a nanolens composed of coupled metal nanoparticles capable of subwavelength focusing of light inside the narrow gap separating the particles. Specifically, we optimize the structure of two nanospheres of different sizes to achieve maximum field enhancement at an off-center position in the gap. We demonstrate that the nanolens of two or more spheres acts simultaneously as an efficient antenna with large dipole and an efficient cavity with small effective volume.

Theory Of Optical Emission Enhancement By Coupled Metal Nanoparticles: An Analytical Approach, Greg Sun, Jacob B. Khurgin

Physics Faculty Publications

We present an analytical “coupled mode” model explaining enhancement of emission by an emitter placed within complexes of metal nanoparticles and apply it for an important case of an emitter placed inside the gap of two coupled Au nanospheres. This approach has dual advantages of exposing the underling physics of the enhancement and revealing a straightforward path toward optimization.

Cellulosic Biofuels: Expert Views On Prospects For Advancement, Erin D. Baker, Jeffrey M. Keisler

Management Science and Information Systems Faculty Publication Series

In this paper we structure, obtain and analyze results of an expert elicitation on the relationship between U. S. government Research & Development funding and the likelihood of achieving advances in cellulosic biofuel technologies. While there was disagreement among the experts on each of the technologies, the patterns of disagreement suggest several distinct strategies. Selective Thermal Processing appears to be the most promising path, with the main question being how much funding is required to achieve success. Thus, a staged investment in this path looks promising. With respect to gasification, there remains fundamental disagreement over whether success is possible even …

Preliminary Report: Evaluating The Potential Of Archaeogeophysical Surveying On Viking Age And Medieval Sites In Greenland, 2 – 16 August, 2010, Douglas J. Bolender, John M. Steinberg, Brian N. Damiata, John W. Schoenfelder, Kathryn Caitlin

Andrew Fiske Memorial Center for Archaeological Research Publications

The primary goal of this research is to begin to overcome biases in the Greenlandic Norse archaeological record. Assessing the establishment dates and organization of Norse sites in Greenland is difficult because substantial cultural deposits can be hidden under deep windblown sand deposits as well as later occupations. Shallow geophysical methods were used to help recover information on the nature, extent and depth of subsurface cultural deposits. Assessing these site characteristics is a first step in overcoming the bias towards the later, the larger, and the more visible sites in the archaeological record.

Norse Greenland presents a relatively visible medieval …

Summary Report: Workshop On International Environmental Governance: Grounding Policy Reform In Rigorous Analysis, Center For Governance And Sustainability At Umass Boston

Center for Governance and Sustainability Publications

From June 27 to 28, 2011, the Federal Office for the Environment of Switzerland, the Global Environmental Governance Project of the Center for Governance and Sustainability at the University of Massachusetts Boston, and the World Trade Institute at the University of Bern hosted a workshop on International Environmental Governance: Grounding Policy Reform in Rigorous Analysis. The workshop started a dialogue between academics and researchers on one hand and policymakers on the other in order to provide analytical input to the political negotiations on institutional reform in the run-up to the UN Conference on Sustainable Development in 2012.

The workshop focused …

Results Of Archaeogeophysical Surveying At The Great Friends Meeting House In Newport, Rhode Island, John M. Steinberg, Brian N. Damiata, John W. Schoenfelder, Kathryn A. Catlin, Christine Campbell

Andrew Fiske Memorial Center for Archaeological Research Publications

Archaeogeophysical surveys were carried out in October 2010 over a 30 x 50 m grid that was established immediately to the north and west of the north end of the Great Friends Meeting House (GFMH) in Newport, RI. The surveys were conducted using a Geonics EM-38 RT ground conductivity meter and a Malå X3M Ground Penetrating Radar (GPR) system that was equipped with 500 and 800 MHz antennas. In addition, a resistance survey was performed over a much smaller central area using a Geoscan RM15 resistance meter. From this work three types of geophysical anomalies have been identified: those associated …