Physical Sciences and Mathematics Commons^™

Data Mining Revision Controlled Document History Metadata For Automatic Classification, Dustin Maass

Theses and Dissertations

Version controlled documents provide a complete history of the changes to the document, including everything from what was changed to who made the change and much more. Through the use of cluster analysis and several sets of manipulated data, this research examines the revision history of Wikipedia in an attempt to find language-independent patterns that could assist in automatic page classification software. Utilizing two sample data sets and applying the aforementioned cluster analysis, no conclusive evidence was found that would indicate that such patterns exist. Our work on the software, however, does provide a foundation for more possible types of …

Origin And Provenance Of Spherules And Magnetic Grains At The Younger Dryas Boundary, Yingzhe Wu, Mukul Sharma, Malcom A. Lecompte, Mark N. Demitroff, Joshua D. Landis

Dartmouth Scholarship

One or more bolide impacts are hypothesized to have triggered the Younger Dryas cooling at ∼12.9 ka. In support of this hypothesis, varying peak abundances of magnetic grains with iridium and magnetic microspherules have been reported at the Younger Dryas boundary (YDB). We show that bulk sediment and/or magnetic grains/microspherules collected from the YDB sites in Arizona, Michigan, New Mexico, New Jersey, and Ohio have (187)Os/(188)Os ratios ≥1.0, similar to average upper continental crust (= 1.3), indicating a terrestrial origin of osmium (Os) in these samples. In contrast, bulk sediments from YDB sites in Belgium and Pennsylvania exhibit (187)Os/(188)Os ratios <<1.0 and at face value suggest mixing with extraterrestrial Os with (187)Os/(188)Os of ∼0.13. However, the Os concentration in bulk sample and magnetic grains from Belgium is 2.8 pg/g and 15 pg/g, respectively, much lower than that in average upper continental crust (=31 pg/g), indicating no meteoritic contribution. The YDB site in Pennsylvania is remarkable in yielding 2- to 5-mm diameter spherules containing minerals such as suessite (Fe-Ni silicide) that form at temperatures in excess of 2000 °C. Gross texture, mineralogy, and age of the spherules appear consistent with their formation as ejecta from an impact 12.9 ka ago. The (187)Os/(188)Os ratios of the spherules and their leachates are often low, but Os in these objects is likely terrestrially derived. The rare earth element patterns and Sr and Nd isotopes of the spherules indicate that their source lies in 1.5-Ga Quebecia terrain in the Grenville Province of northeastern North America.

The Application Of Geographic Information Technology And Ground-Penetrating Radar In The Study Of The Evolution Of The Charles River Basin, Lars E. Anderas

Graduate Masters Theses

A two-part study was conducted on the evolution of the shoreline of the Charles River basin on a city-wide scale as well as in finer detail in Magazine Beach Park, along the Cambridge shore of the river. Both parts of the study utilized geographic information technology (GIT) to integrate and analyze data from modern and historical sources, including maps, digital elevation models (DEMs), and orthographic and oblique photography. The city-scale portion of the study produced estimates of the total area of new land made within the study area since Boston's founding in 1630, 14.3 km², of which 6.5 …

Dendrochronological Analysis Of Jones Homestead

Historic Structures

Dating historical structures using dendrochronology. The Historical Structures collection consists of reports that are the result of dendochronological analysis of timbers from structures in Pennsylvania and Ohio. Contributors: Dilyard, Jeff; Wiesenberg, Nicholas

Slides: A History Of Climate Variability And Change In The American West, Kelly T. Redmond

Water, Climate and Uncertainty: Implications for Western Water Law, Policy, and Management (Summer Conference, June 11-13)

Presenter: Kelly T. Redmond, Regional Climatologist, Western Regional Climate Center (WRCC), Desert Research Institute

65 slides

Dendrochronological Analysis Of Four Sommerset Structures

Historic Structures

Dating historical structures in Somerset, Ohio 2013. The Historical Structures collection consists of reports that are the result of dendochronological analysis of timbers from structures in Pennsylvania and Ohio. Contributors: Stewart, Alexander; Wiesenberg, Nicholas; Wiles, Greg

Geotechnics And Regionalism: The Lineage Of Thought From John Wesley Powell To Benton Mackaye, Nikkilee Cataldo

Muskie School Capstones and Dissertations

John Wesley Powell and Benton MacKaye, each developed exceptionally comprehensive and innovative regional planning visions that had a great deal in common. They both were Jeffersonian idealists, who considered those who tilled the soil and worked the land for primary production a class of men above all the rest.

This paper will explore some of the fundamental theory behind the work of both Powell and MacKaye, as well as examples of the plans that they developed. It will become clear that the two men were working from very similar theoretical vantage points, though in relatively different socio-political eras. It will …

Coble And Eisenhart: Two Gettysburgians Who Led Mathematics, Darren B. Glass

Math Faculty Publications

In 1895, there were 134 students at Gettysburg College, which was then called Pennsylvania College. Of these students, two of them went on to become president of the American Mathematical Society. In this article, we look at the lives of these two men, Arthur Coble and Luther Eisenhart, and their contributions to mathematics and higher education, as well as look at what mathematics was like at Gettysburg at the end of the nineteenth century.

The Rise Of Science In Japan: 日本科学発展と原因, Mario Harper

Mario Yuuji Harper

日本の科学は第二次世界大戦から始まったと多くの人は思っている。もちろん、多くの発展は戦後に行われたのは事実。しかし、戦争以前にも「テクノロジージャパン」な考え方が非常に寿実していた。このスライドショーは日本科学発展の原因となることをいくつか見ています。

Times Of Sand: Sedimentary History And Archaeology At The Sigatoka Dunes, Fiji, Richard Roberts, Geoffrey Hope, Antoine De Biran, Patrick Nunn, Atholl Anderson, William Dickinson, David Burley, Geoffrey Clark

Richard G Roberts

No abstract provided.

Changing Policy Without Changing Law: Addressing Climate Change Under The Clean Air Act, Philip Wallach

Brookings Scholar Lecture Series

The evolution of our national climate change policy at the Environmental Protection Agency (EPA) from the 1990s-2000s, is marked by a backdrop of congressional inaction. In 2007, litigation (Massachusetts v. EPA) required the EPA to re-interpret the Clean Air Act to also apply to greenhouse gases. This presentation will include a summary of the legal arguments in that case, and the narrow Supreme Court decision that supported the petitioners; a review of the legal and practical challenges emanating from this ruling; and consideration of the EPA's impact on continuing legislative debates. The speaker will explore the impact of this decision …

Tree Ring Dating Of The Emerson Barn, Apple Creek, Ohio

Historic Structures

Dating historical structures in Wayne County, Ohio using dendrochronology. The Historical Structures collection consists of reports that are the result of dendochronological analysis of timbers from structures in Pennsylvania and Ohio. Contributors: Nash, Andy; Vargo, Lauren; Wiesenber, Nick; Wiles, Greg

Student Fact Book, Fall 2013, Thirty-Seventh Annual Edition, Wright State University, Office Of Student Information Systems, Wright State University

Wright State University Student Fact Books

The student fact book has general demographic information on all students enrolled at Wright State University for Fall Semester, 2013.