3,725 research outputs found
Meeting with the Hebrew author Elias Hurwitz
No full textWhite paper; handpainted; on the reverse of Luftwaffe uniform pattern. Digitized posters are related to the activities of Jewish displaced persons drawn from the Records of Displaced Persons Camps and Centers in Germany (RG 294.2) Italy (RG 294.3) and Austria (RG 294.4) held by YIVO Archives. Please consult the historical note for those record groups for further information.Digital ImageDigital finding aid available
Obituary announcement about author and labor activist Sh. Mendelson
No full textBrown paper; handpainted. Digitized posters are related to the activities of Jewish displaced persons drawn from the Records of Displaced Persons Camps and Centers in Germany (RG 294.2) Italy (RG 294.3) and Austria (RG 294.4) held by YIVO Archives. Please consult the historical note for those record groups for further information.Digital ImageDigital finding aid available
Sweeping has no effect on renormalized turbulent viscosity
No full textWe perform renormalization group analysis (RG) of the Navier-Stokes equation in the presence of constant mean velocity field , and show that the renormalized viscosity is unaffected by , thus negating the ``sweeping effect", proposed by Kraichnan [Phys. Fluids {\bf 7}, 1723 (1964)] using random Galilean invariance. Using direct numerical simulation, we show that the correlation functions for and differ from each other, but the renormalized viscosity for the two cases are the same. Our numerical results are consistent with the RG calculations
Um paralelo entre o eletromagnetismo e o equivalente teleparalelo da RG
No full textDissertação (mestrado)—Universidade de Brasília, Instituto de Física, 2007.A suposicão de que cargas e correntes de matéria poderiam gerar campos chamados, em analogia ao eletromagnetismo clássico, gravito-elétrico e gravito-magnético origina-se nos primórdios da Relatividade Geral (RG). Por outro lado, o Equivalente Teleparalelo da RG (ETRG), como teoria de gauge, parece-nos o cenário ideal para a definição destes campos que corresponderiam, exatamente como o eletromagnetismo, às componentes do tensor intensidade do campo de gauge. Esta é a proposta deste trabalho: investigar a natureza dos campos gravitacionais elétrico e magnético no contexto do ETRG, analisar as equações que conduzem suas dinâmicas e estudar o comportamento destes campos sob algumas aplicações específicas, tais como a geometria de Schwarzschild e a casca massiva girante. _________________________________________________________________________________ ABSTRACTThe assumption that matter charges and currents could generate fields, called by analogy to eletromagnetism, gravito-eletric and gravito-magnetic, comes from the origin of General Relativity (RG). Besides, the Equivalente Teleparallel of GR (ETGR), as a gauge theory, seems to be the ideal scenario to define these fields, based on the gauge field strength components. This is the purpose of this work: to investigate the nature of the gravitational electric and magnetic fields in the context of ETGR, to analyze the equations that lead its dynamics and to study the behavior of these fields under some specific applications, such as the Schwarzschild geometry and the rotating mass shell.Instituto de Física (IF)Programa de Pós-Graduação em Físic
BONDING AND DYNAMICS OF CNRg AND CRg COMPLEXES
No full textAuthor Institution: Department of Chemistry, Emory University, Atlanta, GA 30322The van der Waals complexes of CN and C with rare gas atoms (Rg) are of interest from the perspectives of their bonding characteristics and predissociation dynamics. Matrix isolation data indicate that that the bonding ranges from a weak van der Waals interaction for the Ne complexes to incipient chemical bonding for Xe. The low-lying vibronic states of CN and C are interleaved, which facilitates electronic energy transfer. Consequently, electronic predissociation of CNRg and CRg complexes provides a useful means to examine the detailed dynamics of electronic energy transfer. Predissociation processes for CNRg complexes have been characterized using double resonance techniques. The final state distributions exhibit symmetry preferences that yield insights concerning the topologies of the relevant potential energy surfaces. In addition, bond energies can be deduced from the predissociation dynamics. Data for the binary complexes CNRg (Rg=Ne, Ar, Kr, and Xe) and CRg will be presented, along with theoretical analyses based on potential energy surfaces
René Géronimo Favaloro : pioneer of Cardiac Surgery
No full textDr. René G. Favaloro moved to the Cleveland Clinic in 1962 and proceeded to reshape the face of cardiac surgery as we knew it. Together with his colleagues at the Cleveland Clinic, Drs. Effler, Sones, Proudfit, Groves, Sheldon and countless others, he contributed to the double internal mammary arterymyocardial implantation by the Vineberg method, and by May 1967, he reconstructed the right coronary artery by the saphenous vein graft interposition. These landmark procedures paved the way for the aorto-coronary saphenous vein bypass graft in October 1967. Many similar breakthroughs ensued, with the application of the bypass technique to the left coronary artery, the combination of coronary artery bypass graft with left ventricular reconstruction and valve repair/replacement and finally, by December, a double bypass to the right coronary artery and anterior descending branch of the left coronary artery. In June, 1971, Dr. Favaloro decided to leave the Cleveland Clinic and return to Argentina where he created a medical centre, a teaching unit, a research department and finally an Institute of Cardiology and Cardiovascular Surgery. This was his greatest personal ambition. Over and above his brilliant mind and craft, Dr. Favaloro was a man of integrity, courage, honesty and humility, whose name will never cease to reverberate throughout the history of medicine.peer-reviewe
A non-classical synthetic strategy for organic mesocrystals
No full textMesocrystals are ordered nanoparticle superstructures, often with internal porosity, which receive much recent research interest in catalysis, energy storage, sensors, and biomedicine area. Understanding the mechanism of synthetic routes is essential for precise control of size and structure that affect the function of mesocrystals. The classical synthetic strategy of mesocrystal was formed via self-assembly of nanoparticles with a faceted inorganic core but a denser (or thicker) shell of organic molecules. However, the potential materials and synthetic handles still need to be explored to meet new applications. In this work, we develop a non-classical synthetic strategy for organic molecules, such as tetrakis (4-hydroxyphenyl) ethylene (TPE-4OH), tetrakis (4-bromophenyl) ethylene (TPE-4Br), and benzopinacole, to produce mesocrystals with composed of microrod arrays via co-solvent-induced crystal transformation. The aligned nanorods are grown epitaxially onto organic microplates, directed by small lattice mismatch between plates and rods. Thus, the present work offers general synthetic handle for establishing well-organized organic mesocrystals.Ministry of Education (MOE)Published versionThe author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This work was supported by the MOE of Singapore (RG 14/13 and RG 5/16), the National Natural Science Foundation of China (No. 21673117), recruitment Program of Global Experts, Jiangsu Provincial Foundation for Specially-Appointed Professor, start-up fund at Nanjing Tech University (39837102), SICAM Fellowship from Jiangsu National Synergetic Innovation Center for Advanced Materials, and Jiangsu Science and Technology Plan (Project No. BK20211258)
As representações do espaço e outras estratégias narrativas em dois romances de Bernardo Carvalho
No full textConselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqThis thesis is a systematic analysis of aspects related to the representation
of spatiality, as well as other narrative strategies employed by Bernardo
Carvalho in the construction of two of his novels: Mongolia (2003) and
The sun sets in São Paulo (2007). What most caught our attention in our
corpus was a certain similarity between the novels in relation to what we
may call the “work’s architecture,” since the procedures used in the
construction of the novels are in many ways alike. In both of them we have
characters who, at some point in the plot, undertake trips to unknown
places which they try to comprehend as well as represent in their
narratives through different forms and in different discursive genres (such
as travel diaries, personal letter, oral narration) present in the novels.
Another important similarity refers to the fact that the novels, at various
times, present first-person narrators who seek to always represent the
spaces from their perceptions and points of view. Another significant
characteristic – probably a trademark in Bernardo Carvalho’s style –, is
the use of the presence of writing characters who, if they are not presently
writing a novel, at least plan to or are really writing a novel, if not the
novel we are reading. We are aware that the term “space” has different
meaning and theoretical importance in various fields of knowledge as
Geography, Art Theory, Physics, Urbanism, Semiotics, Theory of
Literature and Narratology among others, nevertheless we tried to use it
in this dissertation through a transdisciplinary way, favoring approaches
concerning the fields of the Theory of Literature and Narratology.Esta tese é uma análise sistemática dos aspectos relacionados à representação
da espacialidade, assim como de algumas outras estratégias
narrativas empregadas por Bernardo Carvalho na construção de dois de
seus romances: Mongólia (2003) e O sol se põe em São Paulo (2007). O
que mais nos chamou a atenção nesse corpus foi certa semelhança entre
os dois romances naquilo que poderíamos denominar de a “arquitetura da
obra”, uma vez que os procedimentos narrativos empregados em suas
construções se aproximam em muitos aspectos. Neles, temos personagens
que, em algum momento da trama, empreendem viagens a lugares
desconhecidos, que procuram compreender e representar por meio de
diferentes gêneros discursivos (diário de viagem, carta pessoal, relato oral)
presentes nos romances. Outra semelhança importante dá-se pelo fato de
os romances, em vários momentos, apresentarem narradores em primeira
pessoa, que representam os espaços pelos quais se deslocam, quase
sempre, a partir de suas percepções e pontos de vista. Outra característica,
também significativa, certamente uma marca estilística de Bernardo
Carvalho, é a presença, em várias de suas obras, de personagens escritores
que, se não escrevem, ao menos planejam escrever ou realmente estão
escrevendo um romance, quando não, exatamente a obra que estamos
lendo. Considerando todos esses aspectos e ainda cientes de que o termo
“espaço” possui significado e importância teórica em vários campos do
conhecimento, como a Geografia, a Teoria da Arte, a Física, o Urbanismo,
a Semiótica, a Teoria da Literatura, a Narratologia, entre outros,
procuramos abordá-lo, nesta tese, sempre que possível, de maneira
transdisciplinar, privilegiando as abordagens concernentes aos campos da
Teoria da Literatura e da Narratologia
Modeling P-Rg conversions from isolated topographic features near the NORESS array
No full textUsing the T-matrix, or extended boundary condition, method, seismic-wave scattering is modelled from earth models with one-dimensional (1D) isolated topographic features. This study is motivated by observations suggesting that surface topography generates coda waves, which are relatively large-amplitude arrivals following major seismic phases. For sinusoidal periodic surfaces, large-amplitude anomalies in the surface displacement spectrum correspond to P-to-Rayleigh (P-Rg), S-to-Rayleigh (S-Rg), and other mode conversions. For isolated topographic features, these conversions still exist. Teleseismic P-Rg conversions from isolated hills were modelled in order to understand and confirm the origin of observed conversions near the NORESS array. -from Author
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