263,239 research outputs found
De plantarum polline
No full textCarl Julius von Fritzsche (1808-1871), Pharmazeut und Chemiker. Geb. Neustadt (Sachsen, D.) 29.10.1808, gest. Dresden 20.06.1871 (nach dem im Russischen Reich bis Februar 1918 verwendeten Julianischen Kalender eine Differenz von 12 Tagen: 17.10.1808 – 08.06.1871).- Fritzsche, Sohn des Arztes Christian Ferdinand Fritzsche, erhielt bis zu seinem 14. Lebensjahr Privatunterricht in Dresden, danach eine pharmazeutische Ausbildung bei seinem Onkel Friedrich Adolph Struve (1781-1840). 1830 wurde Fritzsche Assistent im Laboratorium des Chemikers Eilhard Mitscherlich (1794-1863) und immatrikulierte 1831 an der Philosophischen Fakultät der Universität Berlin. Hier promovierte er am 10. August 1833 mit seiner Schrift „De plantarum polline“ (Über den Pflanzenpollen; hier präsientiert) zum Dr. phil. Noch 1833 nahm Fritzsche das Angebot seines Onkels Struve an, in St. Petersburg die Leitung einer neu gegründeten Anstalt zur Herstellung künstlicher Mineralwässer zu übernehmen, und übersiedelte nach Russland. Am 24. August 1838 wählte ihn die Akademie der Wissenschaften in St. Petersburg zum Adjunkten für Chemie, was eine zusätzliche fixe Bezahlung und deutliche Reputation bedeutete. Am 06.04.1844 wurde Fritzsche überdies zum außerordentlichen, am 10.04.1852 dann sogar zum ordentlichen Akademiemitglied gewählt; 1870 verlieh man ihm den russischen erblichen Adel. 1869 erlitt Fritzsche einen Schlaganfall, von dem er sich nie wieder ganz erholte; 1870 reiste er nach Deutschland und starb 1871 im Kreis seiner Familie in Dresden. Von seinen 81 wissenschaftlichen Publikationen sind nur fünf botanischen Inhalts, die anderen behandeln rein chemische Themen. Die botanischen Publikationen sind: Beiträge zur Kenntniss des Pollens. Erstes Heft (Berlin 1832); Dissertatio de plantarum polline (Berlin 1833); Ueber den Pollen der Pflanzen und das Pollenin. In: Annalen der Physik und Chemie 108 (= 2. F., 32), 1834, S. 481-492; Ueber die Entwicklung des Pflanzeneies in seinen frühesten Zuständen und über die Bildung der Häute desselben. In: Archiv für Naturgeschichte 2, 1835, 229-232; Ueber den Pollen. In: Mémoirs de savants étrangers 3, 1837, S. 649-670.
Biographische Daten: J. H. Barnhart, Biographical notes upon botanists Vol. 2, S. 13 / ADB 8, 1878, S. 122-123 / A. B. Butlerov, Julij Fedorovič Fricše. In: Zapiski Imperatorskoj Akademii nauk 20, 1872, 190-204 / Leopoldina 7, 1871/72, S. 50 / I. Grosse, Dem Chemiker und Akademiker Carl Julius Fritzsche zum 200. Geburtstag. In: Sächsische Heimatblätter 2008 (2), S. 126-138 / R. Pfrepper, Carl Julius Fritzsche (1808-1871) – Pharmazeut und Chemiker in Dresden, Berlin und St. Petersburg. In: H. Kaden & O. Riha (Hrsg.), Studien zu Carl Julius Fritzsche (1808-1871) und Il’ja Il’ic Mecnikov (1845-1916). Quellenarbeiten in der Wissenschaftsgeschichte (= Relationes 1), Aachen 2008.
Bibliographische Daten: G. A. Pritzel, Thesaurus literaturae botanicae, No. 312
Hellmut Fritzsche
No full textIn a letter he wrote in June 2018, the month of his passing, Hellmut Fritzsche, professor emeritus at the University of Chicago, reflected on his life and marriage: “[My wife] Sybille and I were so very fortunate to have been selected in 1950 to the group of European students who were invited by the US government to come to the United States for one year. This is how we met. How immensely admirable was the generosity of the United States! We both had a rich and rewarding life. We are grateful for the opportunities given to us and for the wonderful life and inspiring circle of friends who questioned and supported us intellectually.” Those of us in that circle were richly rewarded for having experienced Hellmut’s inquisitive mind and vibrant nature
<i>Berlín 1900. Prensa, lectores y vida moderna</i> (2008) de Peter Fritzsche
No full textEntender cómo se construye (lo material) y se representa (lo simbólico) una ciudad implica adentrarnos en lecturas que logren condensar ambas miradas. Y, sobre todo, si hablamos de una ciudad que está atravesando un proceso de transición y cambios como Berlín en el año 1900; las lecturas deben ayudarnos a captar su emergencia constitutiva.
El interrogante no pasa sólo por ver la ciudad como un agente externo y desde afuera, sino también de poder sentir, vivir y habitar la ciudad desde sus protagonistas. Y es allí donde la obra de Fritzsche nos abre nuevos caminos y recorridos para conocer a la ciudad de Berlín. Hablamos de una Berlín que rompe con la idea de postal estática e inmutable para dar lugar a una ciudad moderna, dinámica y siempre en movimiento. El trabajo de Fritzsche nos invita y permite ingresar en esa efervescencia y turbulencia que transmite y transgrede la ciudad moderna. Esta gran máquina urbana viene a tambalear estructuras tradicionales, a fusionar elementos y a proponer nuevos escenarios. El autor logra de manera brillante adentrarnos al pasaje de una tranquila capital del imperio a una ciudad industrial dinámica y transformadora. Como sostiene Luis Romero, Peter Fritzsche ha escrito un fascinante estudio sobre los años anteriores a Weimar y el nazismo, que combina la dimensión urbana con la textual y explora, de manera original, las interrelaciones entre una sociedad popular en proceso de cambio y la construcción de su imaginario a través de la prensa.Facultad de Humanidades y Ciencias de la Educació
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Exchange bias effects in Fe nanoparticles embedded in an antiferromagnetic Cr2O3 matrix
No full textPowders consisting of ferromagnetic (FM) Fe nanoparticles, of about 7 nm in size, embedded in an antiferromagnetic (AFM) Cr2O3 matrix have been obtained by high-temperature reduction under a hydrogen atmosphere of a mixed Cr–Fe oxide. This FM–AFM system exhibits exchange bias effects, i.e. a loop shift (HE) and coercivity enhancement (ΔHC), when field-cooled through the N´eel temperature, TN, of Cr2O3. The exchange bias properties were measured as a function of temperature. HE and ΔHC are found to vanish at about TN(Cr2O3), indicating a good quality AFM matrix. Hence, high-temperature reduction of mixed oxides is demonstrated to be a suitable technique to develop new types of FM–AFM exchange-biased nanoparticles, from which novel applications of this phenomenon may be developed
Appunti sull’edizione di Fritzsche delle Tesmoforiazuse di Aristofane. Il caso dei vv. 953-1000 e alcune riflessioni attuali
No full textL'articolo si concentra su alcuni passaggi dell'edizione di Franz Volkmar Fritzsche delle Tesmoforiazuse di Aristofane, attraverso i quali ripercorre la storia delle principali proposte di articolazione formale del canto corale dei vv. 953-1000 della commedia (prendendo in considerazione anche quanto trasmesso dai manoscritti) e riflette su alcuni principii generali del lavoro filologico
AI, Control and Unintended Consequences: The Need for Meta-Values
No full textDue to their self-learning and evolutionary character, AI (Artificial Intelligence) systems are more prone to unintended consequences and more difficult to control than traditional sociotechnical systems. To deal with this, machine ethicists have proposed to build moral (reasoning) capacities into AI systems by designing artificial moral agents. I argue that this may well lead to more, rather than less, unintended consequences and may decrease, rather than increase, human control over such systems. Instead, I suggest, we should bring AI systems under meaningful human control by formulating a number of meta-values for their evolution. Amongst others, this requires responsible experimentation with AI systems, which may neither guarantee full control nor the prevention of all undesirable consequences, but nevertheless ensures that AI systems, and their evolution, do not get out of control.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Ethics & Philosophy of Technolog
Protecting Animals 36: Author Witi Ihimaera
No full textIn this very special episode of Knowing Animals I am joined by beloved New Zealand author Witi Ihimaera. Witi has written many books featuring nonhuman animals. He offers us a non-colonial lens through which to think about the human/nonhuman relationship
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
A remarkable "ancient" cockroach from Brazil (Insecta: Oothecariformia: Blattodea: Blattidae: Cryptocercinae)
No full textA remarkable "ancient" cockroach from Brazil (Insecta: Oothecariformia: Blattodea: Blattidae: Cryptocercinae). A new cockroach, Eurycanthablatta pugionata n. gen. n. sp. is described for the first time. The material was collected in Brazil near Manaus. The new species exhibits a sexual dimorphism previously unknown in Blattodea: The males bear a large metafemoral spine. This genus and species is the basalmost representative of Lamproblattini. The monogeneric tribe Cryptocercini with the only genus Cryptocercus Scudder, 1862 is transferred into Lamproblattini because of similar genitalic characters. The type material is housed in the Instituto Nacional de Pesquisas da Amazonia (INPA), Manaus, Brazil, and in the collections of Ingo FRITZSCHE (Wernigerode) and Oliver ZOMPRO (Kiel
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