5,275 research outputs found
The Importance of the Nasolabial Flap
O retalho nasogeniana é uma excelente técnica reconstrutiva para reparar os defeitos do terço médio do face, sobretudo os defeitos do nariz.
Os autores descrevem neste artigo cinco casos clÃnicos de doentes que apresentavam tumores da pálpebra inferior,asa do nariz, junção nasolabial, lábio inferior e cavidade bucal, operados no Instituto Português de Oncologia Francisco Gentil de Lisboa.
Nenhum dos doentes foi submetido a um segundo tempo operatório paro correcção de defeitos secundários quer na região dadora quer na região receptora.
Os bons resultados alcançados enfatizam a importância deste retalho, quando tecnicamente bem executado
Aeolian transport of sand
Abstract.: The airborne transport of particles on a granular surface by the saltation mechanism is studied through numerical simulation of particles dragged by turbulent air flow. We calculate the saturated flux qs and show that its dependence on the wind strength u* is consistent with several empirical relations obtained from experimental measurements. We propose and explain a new relation for fluxes close to the threshold velocity ut, namely, qs=a(u*-ut)α with α≈2. We also obtain the distortion of the velocity profile of the wind due to the drag of the particles and find a novel dynamical scaling relation. We also obtain a new expression for the dependence of the height of the saltation layer as function of the strength of the win
Optimum threshold of the 4Kscore for biopsy in men with negative or indeterminate multiparametric magnetic resonance imaging
OBJECTIVE: The study aims to identify the optimal 4Kscore thresholds to determine the need for a prostate biopsy when multiparametric magnetic resonance imaging (MRI) (mpMRI) is negative or indeterminate.
MATERIALS AND METHODS: We analysed retrospective data from men in eight different institutions who underwent an mpMRI, 4Kscore and prostate biopsy for evaluation of prostate cancer. We selected men with a negative (PIRADS ≤2) or indeterminate (PIRADS 3) mpMRI. 4Kscore values were categorized into ranges of 1-7, 8-19, 20-32 and greater than 32. We evaluated the proportion of men with grade group 2 or higher (GG2+) cancer in groups defined by PIRADS and 4Kscore. We also evaluated the number of biopsies avoided and GG2+ cancer missed in each group reported depend on 4Kscore cutoff points.
RESULTS: Among 1111 men who had an mpMRI, 4Kscore and biopsy, 625 of them had PIRADS ≤3 on mpMRI: 374 negative (PIRADS ≤2) and 251 indeterminate (PIRADS 3). In men with a negative mpMRI, we found a 4Kscore cut-point of 33 resulted in an increased risk of GG2+ cancer on biopsy. In patients with an equivocal lesion on mpMRI, men with a 4Kscore cutoff ≥8 had a greater risk of GG2+ cancer on biopsy. Decision curve analysis supported the proposed cut-points in each mpMRI group.
CONCLUSIONS: In men with negative and indeterminate mpMRI, we found the best 4Kscore threshold to determine the need for biopsy to be 33 and 8 respectively. Future prospective studies in independent populations are needed to confirm these findings
Characterizing and Detecting Hateful Users on Twitter
Most current approaches to characterize and detect hate speech focus on
\textit{content} posted in Online Social Networks. They face shortcomings to
collect and annotate hateful speech due to the incompleteness and noisiness of
OSN text and the subjectivity of hate speech. These limitations are often aided
with constraints that oversimplify the problem, such as considering only tweets
containing hate-related words. In this work we partially address these issues
by shifting the focus towards \textit{users}. We develop and employ a robust
methodology to collect and annotate hateful users which does not depend
directly on lexicon and where the users are annotated given their entire
profile. This results in a sample of Twitter's retweet graph containing
users, out of which were annotated. We also collect the users
who were banned in the three months that followed the data collection. We show
that hateful users differ from normal ones in terms of their activity patterns,
word usage and as well as network structure. We obtain similar results
comparing the neighbors of hateful vs. neighbors of normal users and also
suspended users vs. active users, increasing the robustness of our analysis. We
observe that hateful users are densely connected, and thus formulate the hate
speech detection problem as a task of semi-supervised learning over a graph,
exploiting the network of connections on Twitter. We find that a node embedding
algorithm, which exploits the graph structure, outperforms content-based
approaches for the detection of both hateful ( AUC vs AUC) and
suspended users ( AUC vs AUC). Altogether, we present a
user-centric view of hate speech, paving the way for better detection and
understanding of this relevant and challenging issue.Comment: This is an extended version of the homonymous short paper to be
presented at ICWSM-18. arXiv admin note: text overlap with arXiv:1801.0031
Pretibial myxoedema: a case report with scanning electron microscopy.
Made available in DSpace on 2018-01-11T23:40:39Z (GMT). No. of bitstreams: 1
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Previous issue date: 2018-01-10bitstream/item/170810/1/Suita-17-Pretibial-myxoedema-a-case-1.pd
Gauging N=2 Supersymmetric Non-Linear -Models in the Atiyah-Ward Space-Time
We build up a class of N=2 supersymmetric non-linear -models in an
N=1 superspace based on the Atiyah-Ward space-time of (2+2)-signature metric.
We also discuss the gauging of isometries of the associated hyper-K\"ahlerian
target spaces and present the resulting gauge-covariant supersymmetric action
functional.Comment: 12 pages, latex, no figure
3-3-1 exotic quark search at CERN LEPII-LHC
The 3-3-1 electroweak model is the simplest chiral extension of the standard
model which predicts single and double charged bileptons and exotic quarks
carrying -4/3 and 5/3 units of the positron charge. In this paper we study the
possibilities of the production and decay of one of these exotic quarks at CERN
LEPII-LHC collider. For typical vector bilepton, exotic quark masses and mixing
angles we obtained between 20 and 750 events per year. Angular distributions
are also presented.Comment: 5 pages, RevTex 3.1, 9 eps figures, to appear in Phys. Rev.
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