8,699 research outputs found
Stability of oscillatory gravity wave trains with energy dissipation and Benjamin-Feir instability
No full textThe Benjamin-Feir instability describes the instability of a uniform oscillatory wave train in an irrotational flow subject to small perturbation of wave number, amplitude and frequency. Their instability analysis is based on the perturbation around the second order Stokes wave which satisfies the dynamic and kinematic free-surface boundary conditions up to the second order. In the same irrotational flow and perturbation framework of the Benjamin-Feir analysis, the perturbation in the present paper is around a nonlinear oscillatorywave train which solves exactly the dynamic free-surface boundary conditionand satisfies the kinematic free-surface boundary condition up to the third or-der. It is shown that the nonlinear oscillatory wave train is stable with respectto the perturbation when the irrotational flow involves small Rayleigh energydissipation
Lydia S. Wierman letter to Thomas Earl
No full textLetter from Lydia S. Wierman to Thomas Earl of Philadelphia, care of George Forman. Wierman's letter has been truncated somewhat -- here, we have only pages 4 and 5 of what presumably is a longer letter. Weirman speaks eloquently and passionately about the life and work of her brother, abolitionist Benjamin Lundy. Page 4 of the letter opens in the midst of recounting a story by which someone crawls to safety in a wintry woods. The letter continues in a consideration of Lundy's tremendous life's work in abolitionism from Wierman's perspective. Benjamin Lundy (1789-1839) was a prominent Quaker abolitionist best known for his development of abolitionist periodicals. His Genius of Universal Emancipation was first published in 1821 from his home in Mt. Pleasant, Ohio, and enjoyed a wide circulation across the antebellum United States. In the 1820s, the young William Lloyd Garrison came to work for The Genius. Benjamin Lundy traveled widely seeking subscriptions to The Genius, giving talks a
Portrait of Benjamin D. "Don Benito" Wilson, former Mayor of Los Angeles, [s.d.]
No full textPhotographic portrait of Benjamin D. "Don Benito" Wilson, former Mayor of Los Angeles, [s.d.]. The bust of Wilson is shown in an oval frame facing straight ahead. His shoulders are slightly turned to the left. He wears an open jacket, vest and what appears to be a bowtie. He is balding at the top of his head, and is clean-shaven. According to the picture file card, Wilson was the grandfather of United States General George S. Patton
Oral History Interview: Gertrude Wilson (0384)
No full textIn her five January/February/December 1990 interviews with Barry Teicher and R. Lampman, Getrude Wilson discussed in depth her life at University Heights and relationships with and knowledge of UW faculty members from the early 1900s to the 1990s. A primary focus of Wilson?s interviews was dedicated to her experiences with University clubs, in particular the Friday Lunch Club. Wilson also provided insight into the political climate of the University during her time in Madison. Wilson detailed her family history and also discussed numerous University scandals and events. This interview was conducted for inclusion into the UW?Madison Oral History Program.
Background; University Heights in early years; English Department and first novels course; Frederick Jackson Turner; Charles Van Hise; UW golden years, 1890-1920; Benjamin Snow; Louis Kahlenberg; Scott Goodnight; Philip LaFollette; Friday lunch group; Town and gown; Marvin Rosenberry; Edward A. Birge and family; George Sellery; Glenn Frank; William Ellery Leonard; William Lorenz; Max Mason; Clarence Dykstra; Alexander Hohlfeld and German Department during WWI; Women in early years of Medical School; Discrimination; Professors; Deans Lois Mathews, Louise Troxell and Louise Nardin; Joe Hammersley; Skyrockets; William Kiekhofer; Charles Mendenhall; William Middleton; Max and Rhoda Otto; Elizabeth Raushenbush; Dorothy Sharp; Nels Sloan; Dorothy Walton; Buehl family.Same item as: https://minds.wisconsin.edu/handle/1793/6863
Public worship and practical theology in the work of Benjamin Keach (1640-1704)
No full textThe late seventeenth century was a critical and fruitful period
for the Particular Baptists of England. Severely persecuted following
the Restoration, toleration in 1689 brought its own perils.
Particular Baptists were fortunate in having several strong leaders,
especially the London trio of Hanserd Knollys, William Kiffin, and
Benjamin Keach. Such a small and severely persecuted group as the
Baptists could afford little time for academic pursuits, thus of
necessity most of their theology was practical in nature.
Benjamin Keach (1640-1704) was the most outstanding practical
theologian among the English Particular Baptists of the late
seventeenth century. This dissertation is a study of Keach, in
particular his writings on public worship and practical theology.
Although Keach was a prolific author, he has been almost completely
neglected by scholars.
After a biographical sketch of Keach, this study considers his
writings on public worship and practical theology. In the area of
worship, Keach made two outstanding contributions: First, he was the
most vocal apologist for Baptist views on Baptism of his period.
Secondly, and more importantly, his hymn writing and defense of hymn
singing broke new ground, not just for Baptists, but for English
Protestantism, in general. In addition to his contributions in these
areas, he also dealt with the laying on of hands and the sabbath day
worship controversy.
Keach's contributions to practical theology fall into two main
groups: his writings that concern religious education and those that
deal with polity. In addition to these, Keach's vigorous advocacy of
a high Calvinist soteriology are also considered under the rubric of
practical theology. Keach's most important (although not his most
positive) contribution in this area were his soteriological writings.
Although well within the bounds of orthodoxy, some of the tendencies
in Keach's soteriology were taken up by the following generation of
Baptist leaders and developed into a stultifying hyper-Calvinism that
handicapped Baptist evangelism and missions.
In the conclusion, Keach's contributions to a theory of practical
theology are considered
Wilson loops in 5d theories and S-duality
No full textWe study the action of S-duality on half-BPS Wilson loop operators in 5d theories. The duality is the statement that different massive deformations of a single 5d SCFT are described by different gauge theories, or equivalently that the SCFT points in parameter space of two gauge theories coincide. The pairs of dual theories that we study are realized by brane webs in type IIB string theory that are S-dual to each other. We focus on SU(2) SQCD theories with N ≤ 4 flavors, which are self-dual, and on SU(3) SQCD theories, which are dual to SU(2) quiver theories. From string theory engineering we predict that Wilson loops are mapped to dual Wilson loops under S-duality. We confirm the predictions with exact computations of Wilson loop VEVs, which we extract from the 5d half-index in the presence of auxiliary loop operators (also known as higher qq-characters) sourced by D3 branes placed in the brane webs. A special role is played by Wilson loops in tensor products of the (anti)fundamental representation, which provide a natural basis to express the S-duality action. The exact computations also reveal the presence of additional multiplicative factors in the duality map, in the form of background Wilson loops.We study the action of S-duality on half-BPS Wilson loop operators in 5d theories. The duality is the statement that different massive deformations of a single 5d SCFT are described by different gauge theories, or equivalently that the SCFT points in parameter space of two gauge theories coincide. The pairs of dual theories that we study are realized by brane webs in type IIB string theory that are S-dual to each other. We focus on SQCD theories with flavors, which are self-dual, and on SQCD theories, which are dual to quiver theories. From string theory engineering we predict that Wilson loops are mapped to dual Wilson loops under S-duality. We confirm the predictions with exact computations of Wilson loop VEVs, which we extract from the 5d half-index in the presence of auxiliary loop operators (also known as higher qq-characters) sourced by D3 branes placed in the brane webs. A special role is played by Wilson loops in tensor products of the (anti)fundamental representation, which provide a natural basis to express the S-duality action. The exact computations also reveal the presence of additional multiplicative factors in the duality map, in the form of background Wilson loops
Front Matter, Table of Contents, Preface, List of Authors
No full textFront Matter, Table of Contents, Preface, List of Author
Stratospheric geoengineering with black carbon aerosols
No full textI use a general circulation model of Earth's climate to simulate stratospheric geoengineering with black carbon aerosols, varying the altitude of injection, initial particle size, and whether the deposited black carbon modifies ground albedo. 1 Tg of black carbon aerosols injected into the stratosphere each year will cause significant enough surface cooling to negate anthropogenic warming if the aerosols are small (r=0.03 μm) or if the aerosols are injected into the middle stratosphere, although using small aerosols causes large regional cooling effects that would be catastrophic to agriculture. The aerosols cause significant stratospheric heating, resulting in stratospheric ozone destruction and circulation changes, most notably an increase in the Northern Hemisphere polar jet, which forms an Arctic ozone hole and forces a positive mode of the Arctic Oscillation. The hydrologic cycle is perturbed, specifically the summer monsoon system of India, Africa, and East Asia, resulting in monsoon precipitation collapse. Global primary productivity is decreased by 35.5% for the small particle case. Surface cooling causes some sea ice regrowth, but not at statistically significant levels. All of these climate impacts are exacerbated for small particle geoengineering, with high altitude geoengineering with the default particle size (r=0.08 μm) causing a reasonable amount of cooling, and large particle (r=0.15 μm) geoengineering or particle injection into the lower stratosphere causing few of these effects. The modification of ground albedo by the soot particles slightly perturbs the radiative budget but does not cause any distinguishable climate effects. The cheapest means we investigated for placing 1 Tg of black carbon aerosols into the stratosphere by diesel fuel combustion would cost 541 billion annual, or 2.0% and 0.8% of GDP, respectively. The additional carbon dioxide released from combusting diesel to produce these aerosols is about 1% of current emissions, but the additional NOx would be 17% of current sources and could further reduce the total ozone column by up to 10%. Geoengineering with carbon black, if technically feasible, would be much cheaper, costing approximately 1.3 billion annually, with few troublesome emissions factors.Ph.D.Includes bibliographical referencesIncludes vitaby Benjamin S. Kravit
More than just victims: the truth about human trafficking
No full textBenjamin S Buckland argues that the language used to debate human trafficking can cloud the issue itself. Exploitation is only one side of the story. Deep-rooted socioeconomic and political reasons explain why some people fall into illegal or forced migration channels, and tackling these fundamentals requires a new language to acknowledge the agency and ambition of trafficked persons. Copyright (c) 2008 The Author. Journal compilation (c) 2008 ippr.
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