1,731,057 research outputs found
TARO. A review of Colocasia esculenta and its potentials. Ed. Jaw-Kai-Wang
No full textLemordant Denis. TARO. A review of Colocasia esculenta and its potentials. Ed. Jaw-Kai-Wang. In: Journal d'agriculture traditionnelle et de botanique appliquée, 31ᵉ année, bulletin n°1-2, Janvier-juin 1984. pp. 127-128
Analysis of J/Psi production with the CMS detector at the Large Hadron Collider
No full textThe J/psi particle is a vector meson with a mass of 3096.916±0.011 MeV. It has been observed in 1974 by two experiments at Stanford and Brookhaven, and is the first bound state of a charm quark and an anticharm quark ever discovered in the history of particle physics.
Differently from lighter quarks, the charm quark is characterized by a rest mass significantly greater than the typical energy scale of Quantum Chromo Dynamics processes, which take place during the binding of the meson. This greater mass results in its constituent quarks being relatively "slow" inside it, justifying a non-relativistic description of its production process. The J/psi, along with other charm-anticharm bound states, represents an important laboratory where the theoretical models of the strong interaction are verified.
Heavy mesons are produced in copious amounts in high energy proton-proton collisions, and the recent beginning of experiments at the CERN Large Hadron Collider has given an opportunity to study the behavior of J/psi production at a center-of-mass energy of 7 TeV with the CMS detector. This detector has been designed as a general-purpose one and is capable of good performance in this kinds of studies, especially in the J/psi to mu+ mu- decay channel.
Indeed, the past 20 years have seen a revival of interest in the study of the production process of the J/psi. A measurement performed by the CDF experiment in 1992-1993 at the Tevatron p-pbar collider found the production cross-section to be larger than the theoretical prediction by a factor of 50. Consequently, the model in use at the time - the Color Singlet Model - had to be abandoned in favor of a Non-Relativistic QCD description called the Color Octet Model.
Recently, also this model has been put into discussion, as the predictions it makes on the polarization of the J/psi seem not to match experimental data by the E866, HERA-B and CDF II experiments, and even more puzzling is the fact that the E866 and HERA-B measurement are inconsistent. A possible explanation of these inconsistencies may be hidden in the different experimental conditions under which these experiments took place (mainly, the detector acceptances), and the fact that the measurements were performed in different frames of reference.
Once identified the importance of the cross-section and polarization measurements, I present the cross-section measurement performed on data taken in 2010 with the CMS detector and present the ongoing effort in measuring the J/psi polarization by the CMS collaboration - in which I have worked as a student for the purpose of this thesis.
In my thesis I introduce a frame-invariant approach which should overcome these elements and provide a clear picture of the behavior of the polarization (longitudinal, transverse or a combination of these states) as a function of transverse momentum.
The measurement requires a series of introductory steps aimed at understanding all aspects of detector response to muons, among them is the calculation of the detector acceptance for the muon pairs with Monte Carlo simulations, the study based on real data of the tracking efficiency, that of muon identification efficiency and that of trigger efficiency, the latter being one of my responsibilities during my work.
The efficiency study has been performed by the use of the "Tag and Probe" method for resonances decaying to dimuons, where a muon of the pair is required to pass a series of very tight cuts. The pairs surviving this extreme skimming have the other muon analyzed, in order to perform a statistical measurement on the relevant variable
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Supplemental material for A novel gene-set association test based on variance-gamma distribution
No full textSupplemental material for A novel gene-set association test based on variance-gamma distribution by Zhongxue Chen, Qingzhong Liu and Kai Wang in Statistical Methods in Medical Research</p
Variations on the Author
Full text link“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
Full text linkWe 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
Case_report-Supplementary_Figure-20190726 – Supplemental material for ALK or ROS1-rearranged breast metastasis from lung adenocarcinoma: a report of 2 cases
No full textSupplemental material, Case_report-Supplementary_Figure-20190726 for ALK or ROS1-rearranged breast metastasis from lung adenocarcinoma: a report of 2 cases by Xiao Wu, Hong Wang, Mei Fang, Chun Li, Yun Zeng and Kai Wang in Tumori Journal</p
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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