4,612 research outputs found
Letter from Alexander T. Vogelsang to Mr. Snyder regarding the Havasupai reservation with draft of proposed bill
No full textLetter from Alexander Vogelsang to Homer P. Snyder regarding land allocation for the Havasupai Tribe
Left Atrial Appendage Occlusion and Its Role in Stroke Prevention
No full textAtrial fibrillation is a frequent cardiac arrhythmia and is associated with an increased risk of cardioembolic stroke. The left atrial appendage is a finger-like extension originating from the main body of the left atrium and the main location of thrombus formation in patients with atrial fibrillation. Surgical or percutaneous left atrial appendage occlusion (LAAO) aims at preventing clot formation in the left atrial appendage. Here, we describe available surgical and percutaneous approaches to achieve LAAO and discuss the available evidence for LAAO in patients with atrial fibrillation. We discuss LAAO and its role in stroke prevention in 2 frequent scenarios of cerebrovascular medicine: LAAO as a potential alternative to oral anticoagulation in patients with a history of intracranial hemorrhage or at high risk of intracranial bleeding, and LAAO as add-on therapy to direct oral anticoagulant therapy in patients with breakthrough stroke despite anticoagulation. Finally, we provide an outlook on currently ongoing trials that will provide further evidence in the next years
Observations of conduction driven evaporation in the early rise phase of solar flares
No full text<p><b>Context:</b> The classical flare picture features a beam of electrons, which were accelerated in a site in the corona, hitting the chromosphere. The electrons are stopped in the dense chromospheric plasma, emitting bremsstrahlung in hard X-rays. The ambient material is heated by the deposited energy and expands into the magnetic flare loops, a process termed chromospheric evaporation. In this view hard X-ray emission from the chromosphere is succeeded by soft-X-ray emission from the hot plasma in the flare loop, the soft X-ray emission being a direct consequence of the impact of the non-thermal particle beam. However, observations of events exist in which a pronounced increase in soft X-ray emission is observed minutes before the onset of the hard X-ray emission. Such pre-flare emission clearly contradicts the classical flare picture.</p>
<p><b>Aims:</b> For the first time, the pre-flare phase of such solar flares is studied in detail. The aim is to understand the early rise phase of these events. We want to explain the time evolution of the observed emission by means of alternative energy transport mechanisms such as heat conduction.</p>
<p><b>Methods:</b> RHESSI events displaying pronounced pre-flare emission were analyzed in imaging and spectroscopy. The time evolution of images and full sun spectra was investigated and compared to the theoretical expectations from conduction driven chromospheric evaporation.
Results. The pre-flare phase is characterized by purely thermal emission from a coronal source with increasing emission measure and density. After this earliest phase, a small non-thermal tail to higher energies appears in the spectra, becoming more and more pronounced. However, images still only display one X-ray source, implying that this non-thermal emission is coronal. The increase of emission measure and density indicates that material is added to the coronal region. The most plausible origin is evaporated material from the chromosphere. Energy provided by a heat flux is capable of driving chromospheric evaporation. We show that the often used classical Spitzer treatment of the conductive flux is not applicable. The conductive flux is saturated. During the preflare-phase, the temperature of the coronal source remains constant or increases. Continuous heating in the corona is necessary to explain this observation.</p>
<p><b>Conclusions:</b> The observations of the pre-flare phase of four solar flares are consistent with chromospheric evaporation driven by a saturated heat flux. Additionally, continuous heating in the corona is necessary to sustain the observed temperature.</p>
LIFE AND WORK OF ALEXANDER RAUTER
No full textNamen diplomskega dela Življenje in delo Aleksandra Rauterja – duhovnika, pesnika in profesorja matematike – je bil, predstaviti Rauterjevo literarno ustvarjanje na podlagi sedmih tematskih sklopov, in sicer ljubezni, smrti, življenja, duhovnih, zgodovinskih in ljudskih pesmi ter pesmi, ki jih je pesnik posvetil pesnikom in pisateljem. Pričujoče delo prinaša strnjen pregled njegovega literarnega ustvarjanja, iskanje podobnosti in razlik med posameznimi pesniškimi zbirkami. Diplomsko delo je bilo teoretično zastavljeno, nastalo je s poglobljenim študijem literature in virov, tako da predstavlja ustvarjalen prispevek. Pri obravnavi so bile uporabljene naslednje metode: deskriptivna metoda (življenjepis Aleksandra Rauterja), komparativna metoda (primerjanje tematskih sklopov ljubezni, smrti, življenja, duhovne, zgodovinske in ljudske pesmi ter pesmi o pesnikih in pisateljih), metoda klasifikacije (umestitev literarnega ustvarjanja Aleksandra Rauterja v slovenski prostor in književnost) ter metoda sinteze in analize (analiza ugotovljenih dejstev). Pri analiziranju in sintetiziranju Rauterjevih literarnih del se je pokazalo, da so motivi zelo različni, saj je obseg njegovega zanimanja za raznovrstno tematiko zelo obsežen. Snov je pri večini pesmi vzeta iz avtorjevih doživetij in doživljanj, zato je pogosto opazna njegova refleksija. Prepoznavna sporočilnost njegovih pesmi je, da majhnim dogodkom pripiše velik pomenskozi te želi bralce svoje poezije voditi v skladu s krščanskimi vrednotami in nauki.The purpose of diploma thesis “Life and work of Alexander Rauter”, a priest, poet and professor of mathematics, was to present Rauter\u27s literary work based on seven themes. These themes are love, death, life, spiritual, historical and folk songs as well as lyrics which the poet dedicated to poets and writers. The present work provides a concise overview of his literary work as well as searching for similarities and differences between his collections of poetry. The thesis is based on theory and is the result of a thorough study of literature and other sources. The following theoretical methods were used: the descriptive method (Alexander Rauter’s curriculum vitæ), the comparative method (comparing the themes of love, death, life, spiritual, historical and folk songs and poems about poets and writers), the method of classification (classifying Alexander Rauter’s literary work in Slovene area and literature) and the method of synthesis and analysis (analysis of facts). In the analysis and synthesis of Rauter\u27s literary work is shown that the motives are very different because of his interest for a variety of topics. The subject of his poems is mostly taken from the author\u27s experience and perception and therefore his reflection is often noticeable. Recognizable characteristic of his poems is that small events are given great significance through which the author wants to lead readers of his poetry accordant with Christian values and doctrine
The poetical works of Alexander Pope, esq., to which is prefixed the life of the author,
No full textIncludes his translations of Homer, and Parnell's translation of The battle of the frogs and mice (Batrachomyomachia) corrected by Pope.Added t.-p., engr.: The poetical works of Alexander Pope, esq. Including his translation of Homer.Mode of access: Internet
The universal prayer: By the author of the Essay on man.
No full text7,[1]p. ; 2⁰.The author of the Essay on man = Alexander Pope.This edition has "Incence" in last line.Reproduction of original from the British Library.Foxon, P982Griffith, 492English Short Title Catalog, ESTCT5757.Electronic data. Farmington Hills, Mich. : Thomson Gale, 2003. Page image (PNG). Digitized image of the microfilm version produced in Woodbridge, CT by Research Publications, 1982-2002 (later known as Primary Source Microfilm, an imprint of the Gale Group)
Métricas de autor Alexander Cotte Poveda
No full textInforme de las métricas de autor del Dr. Alexander Cotte Poveda de las publicaciones indexadas en Google Académico cuyo objetivo es entregar un insumo para el fortalecimiento de las capacidades y potencialidades de los autores de la Universidad Santo Tomás en el posicionamiento y visibilidad de sus publicacionesReport of the author metrics Alexander Cotte Poveda of the publications indexed in Google Scholar whose objective is to provide an input for the strengthening of the capacities and potentialities of the authors of the Santo Tomás University in the positioning and visibility of their publications.http://unidadinvestigacion.usta.edu.c
THE MAIN CONTRIBUTION OF ALEXANDER FEINBERG 'S WORK TO UZBEK LITERATURE
No full text<p>This article discusses one of the outgoing writer Alexander Feinberg's work and his masterpiece in literature. The author of the article analyzed his work and gave his idea about Alexander Feinberg's very works.</p>
To the 70th Anniversary of Professor Alexander Pavlovich Soldatov
No full textThe paper is devoted to Alexander Pavlovich Soldatov, the well known mathematician, and his contribution to the development of scientific theories and applications. Alexander Pavlovich has turned 70 years on the January, 18th, so we give a short biographical background to his anniversary. Alexander Pavlovich Soldatov was a student of Novosibirsk State University, and graduated from with honours. He continued his education, defended a thesis in the famous V. A. Steklov Mathematical Institute of the USSR Academy of Sciences, became a Candidate of Physical and Mathematical Sciences and then Doctor habilitated of Physical and Mathematical Sciences (in Moscow State University). Today he is a professor, the Leading Researcher of Dorodnicyn Computing Centre in Federal Research Center “Computer Science and Control” of RAS, and has a title of Honored Scientist of Russia. The studies of Alexander Pavlovich in partial differential equations are well known to the specialists. He is an author of more then 170 scientific articles and four monographies. Here we give a list (not complete) of A. P. Soldatov publications for the last five years, that should help readers to see the modern interests of scientist. Alexander Pavlovich Soldatov is an excellent teacher, also he works as reviewer for mathematical journals, develops the mathematical competitions for school and university students and organizes mathematical conferences including international. In the paper we introduce the contribution of Alexander Pavlovich to the mathematics and education science, and give a short compilation of his remarkable scientific results
Asymptotics of twisted Alexander polynomials and hyperbolic volume
No full textFor a hyperbolic knot and a natural number n, we consider the Alexander polynomial twisted by the n-th symmetric power of a lift of the holonomy. We establish the asymptotic behavior of these twisted Alexander polynomials evaluated at unit complex numbers, yielding the volume of the knot exterior. More generally, we prove the asymptotic behavior for cusped hyperbolic manifolds of finite volume. The proof relies on results of Müller, and Menal-Ferrer and the last author. Using the uniformity of the convergence, we also deduce a similar asymptotic result for the Mahler measures of those polynomials
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