3,349 research outputs found
The time-dependent Born-Oppenheimer approximation
No full textWe explain why the conventional argument for deriving the time-dependent Born-Oppenheimer approximation is incomplete and review recent mathematical results, which clarify the situation and at the same time provide a systematic scheme for higher order corrections. We also present a new elementary derivation of the correct second-order time-dependent Born-Oppenheimer approximation and discuss as applications the dynamics near a conical intersection of potential surfaces and reactive scattering
Effective dynamics for Bloch electrons: Peierls substitution and beyond
No full textWe consider an electron moving in a periodic potential and subject to an additional slowly varying external electrostatic potential, phi(epsilonx), and vector potential A(epsilonx), with xis an element ofR(d) and epsilonmuch less than1. We prove that associated to an isolated family of Bloch bands there exists an almost invariant subspace of L-2(R-d) and an effective Hamiltonian governing the evolution inside this subspace to all orders in epsilon. To leading order the effective Hamiltonian is given through the Peierls substitution. We explicitly compute the first order correction. From a semiclassical analysis of this effective quantum Hamiltonian we establish the first order correction to the standard semiclassical model of solid state physics
Letter from Herbert Nicholson to Michi Weglyn, October 30, 1980
No full textA letter from Herbert Nicholson to Michi Weglyn about his experiences working with other religious figures in the Manzanar incarceration camp.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
Letter from Herbert Babbitt to Carl Hayden
No full textLetter from Herbert Babbitt to Carl T. Hayden about grazing cattle in the park boundaries
Harry Herbert Tobies Collection 2008
No full textThe collection contains essays by Harry Herbert Tobies pertaining to the history of East Prussia, particularly
Königsberg, and the Jewish community there. The essays are entitled : "Die Preussen ein baltischer Stamm;"
"Das Verhältnis zwischen Juden und Katholiken; "Israelitische Begräbnisplätze in Königsberg;" and
"Kurt Eisner : Jude oder Nichtjude." Also included is information on books published by Tobies.Harry Herbert Tobies was born on January 28, 1928, in Königsberg (Kaliningrad). Since 1954, he is an architect and
author living in Munich.Processed for digitizatio
Stationary measures and hydrodynamics of zero range processes with several species of particles
No full textWe study general zero range processes with different types of particles on a ddimensional
lattice with periodic boundary conditions. A necessary and sufficient
condition on the jump rates for the existence of stationary product measures is
established. For translation invariant jump rates we prove the hydrodynamic limit
on the Euler scale using Yau’s relative entropy method. The limit equation is
a system of conservation laws, which are hyperbolic and have a globally convex
entropy. We analyze this system in terms of entropy variables. In addition we
obtain stationary density profiles for open boundaries
Hard rod hydrodynamics and the Lévy Chentsov field
No full textWe study the hydrodynamics of the hard rod model proposed by Boldrighini, Dobrushin and Soukhov by describing the displacement of each quasiparticle with respect to the corresponding ideal gas particle as a height difference in a related field. Starting with a family of nonhomo- geneous Poisson processes contained in the position-velocity-length space R3, we show laws of large numbers for the quasiparticle positions and the length fields, and the joint convergence of the quasiparticle fluctuations to a Lévy Chentsov field. We allow variable rod lengths, including negative lengths
A History and Bibliography of George Herbert Editions
No full textA descriptive bibliography of the numerous editions together with their later issues of George Herbert's writings. The list includes separate sections of both relevant manuscripts and also ghost editions. Selections are not included in the bibliography, but the more significant ones are noted in the accompanying essay on the history of George Herbert publications. The essay traces the trends which influence both publishers and their readership over the years 1612-1993, and though the focus is on George Herbert materials, the discussion is applicable to any study of publishing history. It argues that the nineteenth-century revival of interest in Herbert at its most prominent in the Victorian period was primarily a result of a devotionalism which favoured traditional ways. Yet, it is hard to separate this devotionalism from the
bourgeoning antiquarianism of the period. Similarly, those at the head of the
revival of interest in Herbert were literary people: S. T. Coleridge, Ralph
Waldo Emerson, John Keble and the Tractarians, The Pre-Raphaelites, George
Macdonald, and A. B. Grosart. As a result the revival represented a
remarkably comprehensive interest in Herbert's works. By way of contrast, in
the twentieth century the scholarly interest in Herbert appears to have
detached itself from a devotional involvement, and as the century draws to a
close this approach fostered eagerly by the universities brings with it the idea
that Herbert's poetry is inaccessible without an expert's instruction. Thus, at a
time when there is an extraordinary flowering of books about George Herbert,
we are beginning to see the return of Herbert to obscurity, an obscurity in practice which exceeds that which he suffered in the eighteenth century. The essay also considers the variety of ornamentation employed in Herbert editions, particularly the treatments of the shape poems "The Altar" and "Easter Wings", but also the use of plates and illustrations within the text. The bibliography itself includes details of trade bindings, original prices, numbers printed, and printers' and publishers' full addresses wherever possible. There are a number of uses for this bibliography beyond its immediate purpose. Anyone interested in the history of a printing or publishing house
should find helpful data, for instance. Bibliographers who are faced with undated issues or editions of a certain author may find a parallel item in this list which has an assigned date. It is hoped, too, that other bibliographers who are investigating Herbert publications will find this a source of data. The most important purpose of the bibliography, though, is to fill a present gap in Herbert studies, namely the need for a study of the publishing history of Herbert's writings.ThesisDoctor of Philosophy (PhD
Arthrodesis in distal interphalangeal joints with Herbert screw
No full textProcesos degenerativos, inflamatorios y traumáticos alteran la estabilidad articular interfalángica, afectando significativamente la función de la mano por dolor, deformidad e inestabilidad. La artrodesis es un tratamiento exitoso, que provee disminución del dolor con aumento de la estabilidad digital. La artrodesis de articulaciones interfalángicas con tornillos de Herbert ha demostrado ser más estable que otros métodos de fijación con una tasa menor de complicaciones y una rehabilitación rápida. Es interés de los autores demostrar las ventajas que ofrece esta técnica. Objetivos: Describir la evolución clínica en pacientes sometidos a artrodesis interfalángica distal con tornillo de Herbert, midiendo tiempo de consolidación y complicaciones, y comparando los resultados con la literatura mundial. Metodos y materiales: estudio retrospectivo observacional tipo serie de casos en siete pacientes con ocho artrodesis intervenidos por el autor principal con uso de tornillo de Herbert en dos instituciones de Bogotá, evaluando como variables el tiempo de consolidación, el tiempo de seguimiento y la presentación de complicaciones. Resultados: el promedio de consolidación fue de 12 semanas (rango 10-24 semanas) con un seguimiento de 8.7 meses (5-12 meses). Hubo dos complicaciones: un retardo de consolidación (11,11%) y una lesión de lecho ungueal por protrusión de la cabeza de tornillo de Herbert (11,11%) Conclusiones: los resultados muestran similitud a los citados en la literatura mundial, con buen resultado en el tiempo de consolidación con una técnica quirúrgica sencilla y una baja tasa de complicaciones, por lo que se recomienda su uso en nuestro medio. / Abstract. Degenerative, inflammatory and traumatic process alters the interphalangeal stability, affecting the hand function by pain, deformity and instability. The arthrodesis is a successful treatment; decrease the pain with digital joint stability. The distal interphalangeal arthrodesis with Herbert screw had demonstrated more stable than other methods with complications low rate and a quick rehabilitation. The authors emphasize in the advantages of this technique. Objectives: to describe the clinical evolution of patients with Herbert screw distal interphalangeal arthrodesis, to measure fusion time and complications, and to compare the outcomes with the world literature. Methods and materials: retrospective and observational study type series of cases in seven patients with eight arthrodesis operated by the principal author in two clinics of Bogota, to measure time of fusion, time of follow-up and complications. Results: The average time of fusion was 12 weeks (10-24 weeks) with average follow-up of 8.7 months (5-12 months). Two complications were presented: retard of fusion (11, 11%) and nail deformity for head screw protrusion (11, 11%). Conclusions: the outcomes are similar with the results in the world literature, with good outcome in the fusion time, the surgical technique is simple and the complications are low, because we recommended it in our environment.Otr
1980, Robert Lawrence Balzer, wine expert and author of "Wines of California" and Herbert Cerwin
No full textPhotograph of Robert Lawrence Balzer (sitting), wine expert and author of " Wines of California", Herbert Cerwin, and an unidentified woman, Hotel Utah, Salt Lake City, Utah, 198
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