Quasi-Einstein metrics on hypersurface families

We construct quasi-Einstein metrics on some hypersurface families. The hypersurfaces are circle bundles over the product of Fano, K\"ahler-Einstein manifolds. The quasi-Einstein metrics are related to various gradient K\"ahler-Ricci solitons constructed by Dancer and Wang and some Hermitian, non-K\"ahler, Einstein metrics constructed by Wang and Wang on the same manifolds.Comment: 11 pages, v2 expanded and references added. To appear in J. Geom. Phy

Illustrated travel: steel engravings and their use in early 19th century topographical books, with special reference to Henry Fisher & Co..

The aim of this thesis is to investigate the introduction, production and sale of steel engravings in the illustrated picture books of the first half of the nineteenth century with particular reference to the publications of Henry Fisher, who began his career in Liverpool and continued it together with his son Robert in London. By looking at the processes from the initial artist's design through to its engraving and printing, and by establishing the interaction between the artist, author, publisher and engraver, this study will lead to a better understanding of both the economics and aesthetics of print production and determine the destination of these illustrated picture books by examining the relationship between the publisher and the public. Previous work on nineteenth-century topographical steel engraving has largely had a bibliographical rather than historiographical aim and has concentrated on the classification of images into regional units. Although useful these publications are not intended to be critical and do not lead to an understanding of the contextual background necessary to explain the enormous output and consumption of topographical steel-engraved books in the 1830s and 1840s. The two leading specialist topographical print-publishers were the London firms of Fisher, Son & Co. and George Virtue. The early career of Henry Fisher as a master printer of mainly religious publications issued in numbers is examined, and this study shows how his innovative marketing, selling and distribution methods led to these being adopted by others in the publishing trade. His transition from publisher of religious numbers in Liverpool to leading publisher of illustrated topographical works in London is investigated for the first time. As no records, account books or archives appear to have survived, this dissertation is based on the substantial number of illustrated travel books with steel-engraved plates that both firms produced between 1829 and 1844 as well as correspondence from Robert Fisher to the Irish artist George Petrie, in which Fisher explains some of 'the peculiarities of our business'. The two most prolific designers of illustrations for topographical picture books in this period were Thomas Allom (1804-1872) who worked for Fisher, and William Henry Bartlett (1809-1854) who worked for Virtue. Their contribution to the field of topographical book illustration has largely passed unnoticed by art historians who question whether mass produced images can be valued as art. Allom and Bartlett are usually classified as jobbing topographical artists or, at best, as architectural draughtsmen. A secondary aim of this dissertation is to offer a counterbalance to this view and show that their art was more genuinely creative than merely reproductive and moreover that their motives for doing this work were far from being similar

A. Paul Sigurd\u27s Decision

In lieu of an abstract, below is the essay\u27s first paragraph. Well, son, I don\u27t think anyone really knew how he got it. Some said it was always his and that he was always there. Yet others said that he inherited it from his father. And many be1ieved that it was given to him by an impulsive woman - the Hester Prynne type - who, being in dire straits, had to get rid of it. A few even said that he built it himself when lie was a young man. Me? I never cared how he got it; the fact was that he had it and he was there. But I must confess I always wondered why, I mean with no boats coming into the harbor anymore. And did you know that he used to paint it white every spring? And that he used to put the light on every night? Every night it could be seen from the mainland. Going around and around and around. But why? No boats had come into the harbor for nearly twenty years

Effects of Subsurface Drainage on Pavement Performance

This report evaluates the effects of subsurface drainage features on pavement performance through a program of inspection and testing of the subsurface drainage features present in the Long-Term Pavement Performance (LTPP) SPS-1 and SPS-2 field sections. The report will be of particular interest to engineers in the public and private sectors with responsibility for the design, construction, and rehabilitation of highway pavements

On the secondary instability of Taylor-Goertler vortices to Tollmien-Schlichting waves in fully-developed flows

There are many flows of practical importance where both Tollmien-Schlichting waves and Taylor-Goertler vortices are possible causes of transition to turbulence. The effect of fully nonlinear Taylor-Goertler vortices on the growth of small amplitude Tollmien-Schlichting waves is investigated. The basic state considered is the fully developed flow between concentric cylinders driven by an azimuthal pressure gradient. It is hoped that an investigation of this problem will shed light on the more complicated external boundary layer problem where again both modes of instability exist in the presence of concave curvature. The type of Tollmein-Schlichting waves considered have the asymptotic structure of lower branch modes of plane Poisseulle flow. Whilst instabilities at lower Reynolds number are possible, the latter modes are simpler to analyze and more relevant to the boundary layer problem. The effect of fully nonlinear Taylor-Goertler vortices on both two-dimensional and three-dimensional waves is determined. It is shown that, whilst the maximum growth as a function of frequency is not greatly affected, there is a large destabilizing effect over a large range of frequencies