1,960 research outputs found
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Letter from Cecilia Shepperd, National Training School, to Caleb Foote, March 23, 1942
No full textLetter from Cecilia Shepperd from the National Training School in Kansas City, Missouri to Caleb Foote, writing that the school could "take care of 3 young Japanese women," and asking Foote to follow up with school president Cloyd V. Gustafson, "a strong F.O.R. man from California."Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Santa Cecilia Acatitlán: Estado de México
No full textLa información de esta miniguía se basa en los trabajos de Felipe Solís.Durante el periodo Postclásico Tardío (12OO a 1521 d.C.) se llevaron a cabo en la Cuenca de México grandes movimientos culturales y migratorios que originaron uno de los más importantes desarrollos del México antiguo: el de los mexicas. El estudio de los materiales arqueológicos recuperados en las primeras exploraciones -escultura y cerámica- , así como de las características arquitectónicas del edificio que Brasero ceremonial, parte superior del basamento se conserva, no han permitido conocer la extensión del sitio, el número de edificios que conformaban el centro, ni cuáles eran las zonas de habitación. Sin embargo, se sabe que su economía estuvo ligada a los depósitos lacustres de agua dulce o salada y a la agricultura. Se explotaron la fauna, la flora, la sal y el tequesquite, este último se utilizaba en el proceso de cocción del maíz. Se ha descubierto que Acatitlan está cultural y políticamente ligado a los mexicas, aunque no se le menciona en los textos indígenas de la época ni en las fuentes históricas de la conquista o de la Colonia, por lo cual se supone que fue abandonado antes del arribo de los españoles.</p
Cecilia Vicuña, 27th Annual ODU Literary Festival
No full textCecilia Vicuña is a Chilean poet, visual and performance artist and filmmaker, and the author of fourteen poetry books published in Europe, Latin America and the US. She performs and exhibits her work widely at national and international venues. She has an MFA from the University of Chile in Santiago, and she did her postgraduate work at the Slade School of Fine Arts, University College, London. The recipient of many honors, she received The Pennies from Heaven Award, 2002, The Anonymous Was a Woman Award, l999, The Lila Wallace-Reader’s Digest Arts International Award in l992, The Fund for Poetry Award in l995-96 and The Human Rights Award from the Fund for Free Expression in New York in l985. Her poetry has been widely anthologized, most recently in: The Book of the Book, edited by Jerome Rothenberg and Steve Clay, Granary Books, 2000 and Poems for the Millennium, edited by Jerome Rothenberg and Pierre Joris, University of California, l997. Her most recent books include Instan, Kelsey St. Press, 2002; El Templo, translated by Rosa Alcalá, Situations, New York, 2001; Cloud-Net, trans. by Rosa Alcalá, and QUIPOem/ The Precarious, The Art and Poetry of Cecilia Vicuña, edited by M. Catherine de Zegher and translated by Esther Allen, Wesleyan University Press, l997.
Recent solo performances include: University of Cambridge Contemporary Poetry Conference, England, 2002, The Museum of Modern Art, New York, 2001, The Palais des Beaux Arts, Brussels, 2001, IVAM, Valencia, 2001, Tucher Literary Salon, Berlin, 2001,Temple University, 2000, Art in General, New York, l999, Kunst museum, Berne, l998, Whitney Museum of American Art, New York, l997, St Mark’s Poetry Project, New York, l999, Whitechapel Art Gallery, London, l996, Royal Botanical Gardens, Edinburgh, l996, Institute of Contemporary Arts, Boston, l996.
Her films and videos have been exhibited at the Museum of Modern Art, New York, Museo de Arte Contemporáneo, Santiago, Art in General, New York, The Museum of PreColumbian Art, Chile, Museo Etnográfico de la Universidad de Buenos Aires, The Brooklyn Museum of Art and at the Cinarchea International Film Festival, Kiel, Germany, Museo Reina Sofia en Madrid, y Museo de Are Contemporáneo de Barcelona
Camilla [electronic resource] : or, a picture of youth. By the author of Evelina and Cecilia. In three volumes.
No full textAuthor of Evelina and Cecilia = Frances d'Arblay.Edited from imperfect title page affecting imprint.Vol. II printed by Graisberry and Campbell.Vol. III printed by H. Fitzpatrick.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Machine Learning Applications and Observation of Higgs Boson Decays into a Pair of Bottom Quarks with the ATLAS Detector
No full textThe discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is . The measurement of cross sections in exclusive regions of phase space of the production times the branching ratio is reported as well. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. The new simulation approach outperforms the default technique used by ATLAS
measurements and EFT interpretation
No full textThe analysis that led to the observation of the Higgs boson decaying into pairs of bottom quarks has been extended with further interpretation of the signal measurement. The cross sections for the production times the branching ratio have been measured in exclusive regions of phase space. These measurements have been used to search for deviations from the Standard Model predictions with an Effective Field Theory (EFT) approach. An overview of the 2018 analysis with the ATLAS detector and the EFT interpretation are presented
A progressive roadmap for expanding European digital sovereignty
No full textauthor: Cecilia Rikap, associate professor in economics and head of reserach, University College London's Institute for Innovation and Public Purpose (IIPP)In Partnership with Friedrich-Ebert-Stiftun
Approaching the CDF Top Quark Mass Legacy Measurement in the Lepton+Jets channel with the Matrix Element Method
No full textThe discovery of the bottom quark in 1977 at the Tevatron Collider triggered the search for its partner in the third fermion isospin doublet, the top quark, which was discovered 18 years later in 1995 by the CDF and D0 experiments during the Tevatron Run I. By 1990, intensive efforts by many groups at several accelerators had lifted to over 90 GeV the lower mass limit, such that since then the Tevatron became the only accelerator with high-enough energy to possibly discover this amazingly massive quark. After its discovery, the determination of top quark properties has been one of the main goals of the Fermilab Tevatron Collider, and more recently also of the Large Hadron Collider (LHC) at CERN. Since the mass value plays an important role in a large number of theoretical calculations on fundamental processes, improving the accuracy of its measurement has been at any time a goal of utmost importance.
Predominantly produced in ttbar pairs at the Tevatron through strong interactions in ppbar collisions, the top quark mass was measured for the first time by CDF with a value of 176 ± 13 GeV/c^2, showing that this particle was by far the heaviest known elementary particle. This has raised many questions on whether the top quark may play a special role in the Standard Model (SM), in particular in the electroweak symmetry breaking. Due to the huge mass and the very short lifetime (∼ 5 × 10−25 s), about six times shorter than the strong interaction timescale, the top quark decays weakly before hadronization into a W boson and a b quark , giving the chance to study the properties of a bare quark. Top quark pair events are thus characterized by the decay of their two final state W bosons. This leads the ttbar pairs to generate the experimental signatures of two jets associated with the hadronization of the bottom quarks and either a single lepton (e, μ, τ), one undetected neutrino and two light quark jets (lepton+jets channel), or four light quark jets (all-jets channel), or two leptons (ee, eμ, μμ, eτ, μτ, ττ) and two undetected neutrinos (dilepton channels). Up to now, because of its difficult experimental signatures the τ lepton was not exploited in the mass studies.
Different approaches have been followed by the Tevatron experiments to determine the top quark mass. A very powerful technique is the Matrix Element (ME) method which determines the likelihood of observing an event under both ttbar and background hypotheses. The hypotheses are determined from the entire kinematic information associated to every single event by integrating the matrix element of the process over the multidimensional phase space describing the final state. For a given sample of selected events, the parameters to be measured are then determined as those values that maximize the overall likelihood. The superior statistical sensitivity of this method, with respect to other methods based on distribution-fitting, is due to the completeness of the information exploited in each event.
Since the top quark mass is a fundamental parameter of the SM, the CDF Collaboration has decided to make a major effort in order to produce its most precise measurement as a "legacy" of the experiment. A number of improvements over previous measurements are still possible as mentioned below, noticeably comparing the signal candidates not only to the signal expectation, but also to the expectation of the dominant background process (W +jets), whose SM matrix element is now made available to the Collaboration. This thesis provides an overview of the preparatory studies to the final CDF measurement of the top quark mass. We investigate the lepton + jets channel with the full integrated luminosity of Run II (9.0 fb−1). Our analysis uses the ME method to calculate a ttbar likelihood as a bi-dimensional function of the assumed top mass mt and ∆JES. ∆JES parametrizes the uncertainty in our knowledge of the jet energy scale. It is a shift applied to all jet energies in units of the jet-dependent systematic error. By introducing this parameter into the likelihood, we can use as a constraint the known W mass to determine the optimal ∆JES and thereby reduce the final systematic error on the measured top quark mass. For the first time in CDF analyses, we include the background ME modeling in the likelihood integration, with an expected significant reduction of the systematic error of the final result.
The massive calculations required by this double ME method imposed to develop an unconventional, less time-consuming, integration method over the phase space of the events kinematics. In order to evaluate the multidimensional integrals, we employ the "Quasi Monte Carlo" (QMC) technique, based on deterministic sequences generated by choosing points approximately equally spaced in the integration space, such that equal phase space volumes contain approximately equal number of points. This technique significantly reduces the time required to integrate an event, allowing us to reduce greatly the integration time needed to reach the required precision. It also imposes extensive studies to make sure that no bias is introduced relative to a standard MC calculation.
The present thesis describes in detail the contributions given by the candidate to the massive preparation work needed to make the new analysis possible, during her 8 months long stay at Fermilab. These include selection of the candidates within looser cuts than in the past, estimate of the expected number of signal and background events, evaluation of the acceptance, model comparison of the final validation plots, optimization of the integration method and of its systematic error, and more as described in chapters 4 to 7.
Chapter 1 gives a brief introduction of top quark physics. Some previous mass measurements, as well as the refinements introduced in our analysis, are discussed.
Chapter 2 contains the description of the Tevatron accelerator complex and the CDF II detector.
Chapter 3 describes the reconstruction of the physical objects on which the event analysis relies.
The event selection is described in Chapter 4, where the complete list of the selection requirements and the estimation of the sample composition are presented, as well as the comparison between model and data.
Chapter 5 explains the ME method in detail, examining each part of the likelihood expression, and Chapter 6 deals with the QMC integration employed in the analysis.
In Chapter 7 the current status of the analysis and the future steps required to perform the measurement are described. Preliminarily to the final analysis of real data, future studies will include a calibration procedure and evaluation of systematic errors by means of pseudo-experiments. The goal of the measurement is to reach a total error of about 0.6 GeV/c^2, about 20% less than the present error of the world-averaged mass value. The candidate is planning to contribute from a distance to this final part of the measurement
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