A microscopic view of the yielding transition in concentrated emulsions

We use a custom shear cell coupled to an optical microscope to investigate at the particle level the yielding transition in concentrated emulsions subjected to an oscillatory shear deformation. By performing experiments lasting thousands of cycles on samples at several volume fractions and for a variety of applied strain amplitudes, we obtain a comprehensive, microscopic picture of the yielding transition. We find that irreversible particle motion sharply increases beyond a volume-fraction dependent critical strain, which is found to be in close agreement with the strain beyond which the stress-strain relation probed in rheology experiments significantly departs from linearity. The shear-induced dynamics are very heterogenous: quiescent particles coexist with two distinct populations of mobile and `supermobile' particles. Dynamic activity exhibits spatial and temporal correlations, with rearrangements events organized in bursts of motion affecting localized regions of the sample. Analogies with other sheared soft materials and with recent work on the transition to irreversibility in sheared complex fluids are briefly discussed.Comment: 11 pages, 10 figures. Submitted to Soft Matte

Deductive and Analogical Reasoning on a Semantically Embedded Knowledge Graph

Representing knowledge as high-dimensional vectors in a continuous semantic vector space can help overcome the brittleness and incompleteness of traditional knowledge bases. We present a method for performing deductive reasoning directly in such a vector space, combining analogy, association, and deduction in a straightforward way at each step in a chain of reasoning, drawing on knowledge from diverse sources and ontologies.Comment: AGI 201

GEN MS 12 Luther I. Bonney Papers Finding Aid

Description: Luther I. Bonney was born in Turner, Maine in 1884. After graduating from Bates College in 1906, Bonney was involved in education for the rest of his life. He was a Professor of Mathematics at Middlebury College, Vermont from 1907-1927, and Dean of Portland Junior College, one of USM’s progenitor schools, from 1933 until 1958. The Papers consist of histories he wrote, poetry, WWII letters from former students, honorary degrees, and a taped 1974 interview of Bonney. Date Range: 1933-1974 Size of Collection: 0.5 ft

GEN MS 10 Harriet Sweetser Letters Finding Aid

Description: Harriet Sweester attended Gorham Normal School in the 1890s. She became a teacher and the first Administrator of Home Economics for the Maine State Department of Education. The collection contains letters Sweetser wrote home describing her daily life as a student. Date Range: 1890s Size of Collection: 0.5 ft

GEN MS 10 Harriet Sweetser Letters

Provenance: Donated by Elizabeth Sweetser Baxter in 1999. Ownership & Literary Rights: The Harriet Sweetser Letters are the physical property of the University of Southern Maine Library. Literary rights, including copyright, belong to the creator or his legal heirs and assigns. For further information, consult the Head of Special Collections. Cite as: Harriet Sweetser Letters, Special Collections, University of Southern Maine Libraries. Restrictions on access: This collection is open for research

GEN MS 18 Eleanor Humes Haney Papers Finding Aid

Description: Eleanor Humes Haney was a feminist theologian and community activist in Maine from 1979 until her death in 1999. The Papers cover issues related to her work, including feminism, anti-racism, LGBT issues, and the environment. Date Range: 1979-1999 Size of Collection: 2 ft

GEN MS 04 William W. Layton Collection Finding Aid

Description: William W. Layton is an amateur American historian and collector of historical artifacts in Virginia who donated these items in honor of the creation of the Gerald E. Talbot Collection. The Collection consists of 10 original manuscripts, an original lithograph, 2 facsimiles and 14 transcripts and/or photocopies of the manuscripts, regarding Mainers over a period of years in the 19th century, with an emphasis on William Pitt Fessenden and the U.S. Civil War. Date Range: 1800s Size of Collection: 2 ft

GEN MS 15 Francis L. Bailey Papers Finding Aid

Description: Francis L Bailey was President of Gorham State Teacher\u27s College from 1940 to 1960. The Papers consist of Certificates presented to him: Appointment as Reemployment Committeeman, Cumberland County Local Board No. 4, Maine, 1945 Je 13; Certificate of Appreciation for uncompensated Service in the Selective Service System, undated. Date Range: 1945 & undated Size of Collection: 1 ft

GEN MS 08 Walter E. Russell Papers Finding Aid

Description: Dr. Walter E. Russell Papers span the period 1874-1945, the bulk of them 1870s-1880s, consisting of writings on education and allied topics as well as his sermons. There are a small number of printed items and a photograph of the1928 School Summer Session. Russell often used printed material as scrap paper, so forms usually found in the office of an education administrator of the time occur in these Papers. Date Range: 1874-1945 Size of Collection: 2 ft

GEN MS 13 Kenneth T. H. Brooks Finding Aid

Description: Kenneth T. H. Brooks received his undergraduate degree from the University of New Hampshire and Masters and Doctoral degrees from Boston University. He served as President of Gorham State Teacher’s College from 1960-68, then continued as President of the University of Maine at Gorham from 1968-1970. He stepped down when Gorham merged with the University of Maine at Portland. He wrote See the Green and White Advancing: A History of Gorham Normal School, Teachers College, and State College 1878-1970, which was published in 1995. Kenneth Brooks died December 4, 1995. This small miscellaneous group of papers focuses on Brooks in his role as head of the Gorham teaching institution from 1960-1970. The chronological file contains honors he received from other academic institutions as well as several of his grade school and high school papers. Date Range: 1921-1971 Size of Collection: 0.25 ft