Search results for "document."

Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV

2012

This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb[superscript −1] of pp collision data at √s = 7 TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothes…

Combination of D0 measurements of the top quark mass

2017

We present a combination of measurements of the top quark mass by the D0 experiment in the lepton+jets and dilepton channels. We use all the data collected in Run I (1992--1996) at $\sqrt s=1.8$ TeV and Run II (2001--2011) at $\sqrt s=1.96$ TeV of the Tevatron $p \bar{p}$ collider, corresponding to integrated luminosities of 0.1 fb$^{-1}$ and 9.7 fb$^{-1}$, respectively. The combined result is: $m_t = 174.95 \pm0.40\,{\rm(stat)} \pm 0.64\,{\rm(syst)}\,{\rm{GeV}}=174.95 \pm 0.75 \, {\rm{GeV}}$.

Comparison of MeSH terms and KeyWords Plus terms for more accurate classification in medical research fields. A case study in cannabis research

2021

Abstract KeyWords Plus and Medical Subject Headings (MeSH) are widely used in bibliometric studies for topic mapping. The objective of this study is to compare the two description systems in documents about cannabis research to find the concordance between systems and establish whether there is neutrality in topic mapping. A total of 25,593 articles from 1970 to 2019 were drawn from Web of Science's Core Collection and Medline and analyzed. The tidytext library, Zipf's law, topic modeling tools, the contingency coefficient, Cramer's V, and Cohen's kappa were used. The results included 10,107 MeSH terms and 28,870 KeyWords Plus terms. The Zipf distribution of the terms was different for each…

Using Topic Modeling Methods for Short-Text Data: A Comparative Analysis

2020

With the growth of online social network platforms and applications, large amounts of textual user-generated content are created daily in the form of comments, reviews, and short-text messages. As a result, users often find it challenging to discover useful information or more on the topic being discussed from such content. Machine learning and natural language processing algorithms are used to analyze the massive amount of textual social media data available online, including topic modeling techniques that have gained popularity in recent years. This paper investigates the topic modeling subject and its common application areas, methods, and tools. Also, we examine and compare five frequen…

The Phycosiphon record in the Ladrilleros-Juanchaco section (Miocene, Colombian Pacific): palaeoecological implications

2018

 Miocene rocks of the Ladrilleros-Juanchaco section, located on the NW margin of South America, contain a high diverse and abundant trace fossil assemblage. The relative abundance of Phycosiphon, together with its morphological variations, provides new insights into the environmental conditions. Detailed outcrop stratigraphic, ichnological, and geochemical analyses carried out in the section focused on the trace fossil assemblages (distribution, relative abundance), ichnofabric index, and, especially, in the general ichnological features of Phycosiphon . In addition, the detailed photographic documentation and the use of the digital image treatment technique facilitate the precise study of …

Individualized Education Plans: What Characterizes the Research?

2015

<p><em>This study illuminates the research question what characterizes the research of Special Needs Education’s (SNE’s) use of Individualized Education Plans (IEP), during the period 2010-2015? A sample of 11 relevant Norwegian publications has been analyzed by means of these criteria: Type of publication, research method(s) applied, sub-topics focused on and perspectives of SNE. Findings show (1) the amount of the research is still scarce, (2) only three researchers of PhD-level or above have participated in this sample of publications, (3) the sample demonstrates various research methods applied, although document analysis dominates, (4) there is still a need of research look…

Documentos árabes a Al-Azraq (1245-1250)

1982

Un pequeño tratado de diplomática de José Mariano Ortiz

1980

A relational model for unstructured documents

1987

The logical structure of a document is usually a tree in which the order of the nodes is important at least at some level of the tree. We call a document unstructured if its structure is a single-level ordered tree. The purpose of this paper is to present a many-sorted algebra for handling unstructured documents. The documents in the model are represented by relations. An algebra for handling documents of one type can be extended to an algebra for handling documents of several types. Further, an algebra for handling documents can be extended by the relational algebra for handling documents and relations in a common algebra. The model of this paper can be regarded as a part of a general docu…

Un museo de ciencia accesible a la sociedad. Contribución e impacto

2022

El conocimiento es objeto de investigación y discusión; la ciudadanía lo utiliza de manera crítica transformándolo en herramientas que les permiten mejorar su vida a nivel individual y colectivo. Las diferencias sociales y jerárquicas que históricamente determinaban el acceso al capital formativo se han difuminado en el último siglo, y cada vez más se consume una gran variedad de formas de cultura, independientemente del nivel social, económico o cultural. Entre los centros culturales más visitados por los y las ciudadanas encontramos los museos. Estos núcleos de conocimiento trabajan para que su finalidad comunicativa esté en sintonía con los contenidos que ofrecen y tratan de dar respuest…