262,314 research outputs found
Particle-Transport Analysis in Reversed Field Pinch Helical States
No full textThis Letter reports the result of a numerical study of particle transport in self-organized single helicity (SH) and quasi-SH reversed field pinch plasmas. Our code, benchmarked against experimental data, predicts a large improvement in particle transport for SH compared to the standard multiple helicity states. The contribution of neoclassical effects is noted. An estimate of the ambipolar electric field in helical states and in fully stochastic magnetic fields is given
Imaging of helical coherent structures in the Reversed Field Pinch
No full textImages obtained with soft X-ray tomography in the RFX reversed field pinch device are presented. They show that the plasma can be in two different regimes, characterized by a different degree of magnetic chaos. Evidence of a coherent helical structure emerging from the chaotic plasma core is shown. These images indicate the power of tomography, which allows the study of the dynamics of a Hamiltonian system like the magnetic field line
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
Experimental investigation of plasma topological properties in the Reversed Field Pinch
No full textA description of some topological properties of the Reversed Field Pinch (RFP) equilibrium during Quasi Single Helicity (QSH) states is presented. From experimental measurement of the soft X-ray emissivity in the RFX device, maps information on the presence and absence of a magnetic separatrix is obtained. Correlations with the level of magnetic chaos within the plasma are discussed
Herrerasauridae (Dinosauria, Saurischia) e fauna associada do sítio Predebon (Formação Santa Maria, zona de associação de Hyperodapedon), São João do Polêsine, Rio Grande do Sul (Brasil)
No full textOs sedimentos triássicos do Sítio Predebon, situado no município de São João do Polêsine, Rio Grande do Sul, sob as coordenadas 29º38’29”S/53º26’52”W se insere na Supersequência Santa Maria (Bacia do Paraná). Este sítio inclui uma típica fauna da Zona de Associação de Hyperodapedon, com pegadas e pistas de pequenos vertebrados e abundantes restos de rincossauros, podendo ser correlacionada à Formação Ischigualasto (Bacia Ischigualasto-Villa Unión), de idade carniana, na Argentina. O presente estudo tem por objetivo registrar novos restos de dinossauros para o Sítio Predebon, achados em 2001 durante o Projeto Pró-Guaíba e tombados na Seção de Paleontologia do Museu de Ciências Naturais da Secretaria Estadual do Meio Ambiente e Infraestrutura (MCN/SEMA), Porto Alegre, RS. Parte do material trata-se de duas vértebras dorsais e um sacro de um mesmo indivíduo sob o número MCN-PV 10344a,b,c, e apresenta os seguintes caracteres: (i) fossa lateral no corpo vertebral, (ii) face ventral do corpo côncava; (iii) processo espinhoso alto e largo no topo, de formato subquadrangular nas dorsais e sacrais; (iv) cristas infrapré- e infrapós-zigapofisiárias nas dorsais; (v) presença de hiposfeno e hipantro; e (vi) primeira vértebra sacral maior que a segunda, com processos transversos e costelas sacrais amplas, de formato triangular em vista dorsal. Esse conjunto de caracteres permitiu atribuir o material estudado como de um exemplar do clado Herrerasauridae, particularmente com Herrerasaurus ischigualastensis da Formação Ischigualasto. MCN-PV 10344c difere dos herrerassaurídeo Staurikosaurus pricei e Gnathovorax cabreirai da ZA de Hyperodapedon do Triássico brasileiro, em função de que St. pricei apresenta três vértebras sacrais menores e mais gráceis e processo espinhoso baixo e sem plataformas subquadrangulares no topo, enquanto G. cabrerai possui plataformas subretangulares, pouco mais alongadas ântero-posteriormente. Os demais materiais consistem em dentes isolados em forma de lâmina e serrilhados (MCN-PV 10425 e MCN-PV 10426), e foram atribuídos a Archosauriformes indet., visto que este morfótipo é observado em Herrerasauridae, Theropoda e em alguns Sauropodomorpha basais. Com relação a paleofauna do Sítio Predebon, observamos que a abundância de rincossauros e a ausência do cinodonte Exaeretodon, sugerem que o afloramento pertença a porção inferior da ZA de Hyperodapedon (“Hyperodapedon Acme Zone”).The Triassic sediments of the Predebon Site, located in the municipality of São João do Polêsine, Rio Grande do Sul, under coordinates 29º38'29"S/53º26'52"W, are part of the Santa Maria Supersequence (Paraná Basin). This outcrop includes a typical fauna of the Hyperodapedon Assemblage Zone, with footprints and tracks of small vertebrates and abundant rincosaur remains, and it is correlated to the Carnian-aged Ischigualasto Formation (Ischigualasto-Villa Unión Basin) in Argentina. The present study aim to record new dinosaur remains from the Predebon Site, found in 2001 during the Pro-Guaíba Project and deposited in the Paleontology Section of the Museu de Ciências Naturais, Secretaria Estadual do Meio Ambiente e Infraestrutura (MCN/SEMA), Porto Alegre, RS, Brazil. Part of the material consists of two dorsal vertebrae and a sacrum from the same individual under number MCN-PV 10344a,b,c, and presents the following characters: (i) lateral fossa in the vertebral body; (ii) concave ventral body face; (iii) high and broad neural spine at the top, subquadrangular in shape in the dorsals and sacrals; (iv) infrapre- and infrapost-zygapophyseal ridges in the dorsals; (v) presence of hyposphene and hypanthrum; and (vi) first sacral vertebra larger than the second, with transverse processes and broad sacral ribs, triangular in shape in dorsal view
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
Imaging of a double helical structure in the reversed field pinch
No full textX-ray tomography and Poincare reconstructions with the ORBIT code allow imaging of coherent structures emerging in a magnetized fusion plasma when chaos in the magnetic field is reduced
Author in Essay by I. A. Goncharov “Pepiniere”
No full textFeatures of the embodiment of the author’s position in the essay by I. A. Goncharov “Pepiniere” are considered. The relevance of the study is due to the poorly studied poetics of this work. A review of the scientific literature on relevant topics is performed. Methodological and theoretical definitions are given. The scientific novelty of the article is in the fact that for the first time attention is paid to artistic techniques that allow to identify the author's position in the specified literary text. The author of the article grounds her opinion from the fact that, despite the dominance of the subjective point of view, other characters’ views stand out in the work. It is concluded in the study that the text of the work represents a biographical author and author-creator. It was established that the position of the author-creator is expressed through the title, epigraphs, which are quotes, as well as through different points of view, including the author-character, the author-narrator, the characters of the work. The author of the article dwells in detail on different ways of expressing the points of view of the author-character and the author-narrator. It is proved that the point of view of the author-character and the author-narrator can intersect, they are interchanged. The author's development of the term comic “point of view” is presented in the article
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