1,720,977 research outputs found
Testing the equivalence principle in space after the MICROSCOPE mission
Get PDFTests of the weak equivalence principle (WEP) can reveal a new, composition dependent, force of nature, or disprove many models of new physics. For the first time, such a test is being successfully carried out in space by the MICROSCOPE satellite. Early results show no violation of the WEP sourced by the Earth for Pt and Ti test masses with random errors (after 8.26 d of integration time) of about 1 part in 1014 and systematic errors of the same magnitude. This result improves by about 10 times over the best ground tests with rotating torsion balances despite 70 times less sensitivity to differential accelerations, thanks to the much stronger driving signal in orbit. The measurement is limited by thermal noise from internal damping in the gold wires used for electrical grounding, related to their fabrication and clamping. This noise was shown to decrease when the spacecraft was set to rotate faster than planned. The result will improve by the end of the mission, as thermal noise decreases with more data. Not so systematic errors. We investigate major nongravitational effects and find that MICROSCOPE's "zero-check" sensor, with test masses both made of Pt, does not allow their separation from the signal. The early test reports an upper limit of systematic errors in the Pt-Ti sensor, which are not detected in the Pt-Pt one, hence would not be distinguished from a violation. Once all the integration time available is used to reduce random noise, there will be no time left to check systematics. MICROSCOPE demonstrates the huge potential of space for WEP tests of very high precision and indicates how to reach it. To realize the potential, a new experiment needs the spacecraft to be in rapid, stable rotation around the symmetry axis (by conservation of angular momentum), needs high quality state-of-the-art mechanical suspensions as in the most precise gravitational experiments on ground, and must allow multiple checks to discriminate a violation signal from systematic errors. The design of the "Galileo Galilei" (GG) experiment, aiming to test the WEP to 1 part in 1017 unites all the needed features, indicating that a quantum leap in space is possible provided the new experiment heeds the lessons of MICROSCOPE
Study of the assisted population in the specialty career in endodontics : FO UNCuyo. Mendoza
Get PDFEn epidemiología existen estudios y descripciones de la
salud y enfermedad que ocurren en una población determinada,
teniendo en cuenta una serie de “Patrones de la
enfermedad", el tiempo y lugar en donde aparece la enfermedad,
y aquellas personas con más probabilidades de
sufrirla. Estas enfermedades en endodoncia son las patologías
pulpares y periapicales. Un estudio prospectivo se
llevó a cabo en pacientes que fueron tratados durante el
período comprendido entre 2016 y 2017 en la Carrera de
Especialización de Endodoncia FO. UN Cuyo. Para este estudio
se tomaron en cuenta las siguientes variables: edad,
sexo, localidad donde reside el paciente, diente afectado,
patología presente. El objetivo de este estudio fue realizar un estudio de esta población mediante la recolección de
datos de la historia clínica diseñada para la atención de
los pacientes tratados en la Carrera de Especialización en
Endodoncia. FO UN Cuyo - 2016 – 2017In epidemiology there are studies and descriptions of the
health and disease that occur in a given population, taking
into account a series of “Patterns of the disease", the time
and place where the disease appears, and those people
most likely to suffer it. These diseases in endodontics are
the pulpal and periapical pathologies. A prospective study
was carried out on patients who were treated during
the period between 2016 and 2017 in the Endodontic
Specialization Career FO. UN Cuyo. For this study, the
following variables were taken into account: age, sex,
location where the patient resides, affected tooth, present
pathology. The objective of this study was to conduct a
study of this population through the collection of data from the clinical history designed for the care of patients
treated in the Specialization Course in Endodontics. FO UN
Cuyo -2016 - 2017Fil: Anselmi, Alberto.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Reyes, María Gimena.
Universidad Nacional de Cuyo. Facultad de Odontologí
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
"I shall be short"
Get PDFLa brevitas come scelta di comunicazione. L'esempio come insegnamento. L'autobiografia come oggetto di studio. La riservatezza come stile di vita
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dental anomalies : fused teeth, endodontic approach
Get PDFLa fusión dental es una anomalía dentaria que consiste en la unión embriológica o en fases pre-eruptivas de dos o más gérmenes dentarios adyacentes por medio de dentina con el resultado de un diente único. Se revisa el diagnóstico diferencial, las formas clínicas y el plan de tratamiento de esta anomalía.Fused teeth is a dental anomaly which consists in the union of at least two adjacent teeth by dentin, with the result of a unique teeth. Differential diagnosis, clinical patterns and treatment planning of fused teeth are reviewed.Fil: Peña, Graciela Roxana.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Reyes, María Gimena.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Anselmi, Alberto.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Barrera Borio, Maira Sol .
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: González, Ana Julieta.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Rodríguez, Alicia.
Universidad Nacional de Cuyo. Facultad de Odontologí
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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