1,720,974 research outputs found
Low-energy scales and temperature-dependent photoemission of heavy fermions
No full textWe solve the S = 1/2 Kondo lattice model within the dynamical mean field theory. Detailed predictions are made for the dependence of the lattice Kondo resonance and the conduction electron spectral density on temperature and band filling, n(c). Two low-energy scales are identified in the spectra: a renormalized hybridization pseudogap scale T*, which correlates with the single-ion Kondo scale, and a lattice Kondo scale T-0 much less than T*, which acts as the Fermi-liquid coherence scale. The lattice Kondo resonance is split into a main branch, which is pinned at the Fermi level, and whose width is set by T-0, and an upper branch at omega approximate to T*. The weight of the upper branch decreases rapidly away from n(c) = 1 and vanishes for n(c) less than or similar to 0.7 (however, the pseudogap in the conduction electron spectral density persists for all n(c)). On increasing temperature, we find that the lattice Kondo resonance vanishes on a temperature scale of order 10T(0), the same scale over which the single-ion Kondo resonance vanishes in impurity model calculations. In contrast to impurity model calculations, however, we find that the position of the lattice Kondo resonance depends strongly on temperature. The results are used to make predictions on the temperature dependence of the low-energy photoemission spectrum of metallic heavy fermions and doped Kondo, insulators. We compare our results for the photoemission spectra with available high-resolution measurements on YbInCu4 and YbAgCu4. The loss in intensity with increasing temperature, and the asymmetric lineshape of the low-energy spectra are well accounted for by our simplified S = 1/2 Kondo lattice model
SU-E-J-96: Predictive Neural Network for Parotid Glands Deformation Using IGRT and Dose Warping Systems
No full textPurpose:
Tumor shrinkage and modification of patient anatomy may occur within the weeks of therapy. Dose warping algorithm and IGRT can usefully determinate morphological variations occurring during treatments and predict possible challenge or requirement of re-planning. Using metaanalysis and developing Predictive Neural Network (PNN) is possible to collect information for perspective treatment evaluation of inappropriate dose delivery or to re-planning care course.
Methods:
23 H'N patients, treated using Tomotherapy Unit, were post-processed using deformable hybrid algorithms to generate contours evolution throughout the course. 750 MVCT were elaborated focusing on parotids. For each deformable image registration were generated deformable ROIs and re-mapped to dose grid to accumulate dose. A nomogram was developed to evaluate Volume (V) and Dose (D) variations. Using Moving Average (MA) function and PNN were identified the weeks when re-plan should be predictable.
Results:
The weekly nomogram provided the percentage of patients affected by V and D deviation respect to the first day of treatment. During 1st week of treatment 95% of patients have a ΔV=10% and ΔD=2%. In the 6th week, only 70% of cases remain inside that range. The PNN using Cluster Analysis and Support Vector Machines, highlighted the requirement of warping methods in clinical practice. Validated by 8 patients test cases, PNN allow to classify 2 statistical cluster related to original plan and re-plan requirements. MA with period of 3 and 5 days, predict days of treatment where to locate physics replan. Best statistical benefits can be achieved with evaluation in the 4th week.
Conclusion:
Body morphing and organ motion during therapy can affect to the dose distribution and induce unexpected or late toxicities. Hybrid deformable registration allows to study the time to re-plan or to adapt treatments. Monitoring large patient's database during treatments, thereby rising accuracy in nomograms, PNN and reproducibility of treatments.
The research is partially co-funded by the MoH (GR-2010-2318757) and Tecnologie Avanzate S.r.1.(Italy
Lussazione intrusiva in dentizione decidua: complicanze a lungo termine
No full text13 Maggio 2010: Emanuele, 17 mesi, si presenta in urgenza all’attenzione del reparto di “Assistenza
odontoiatrica per disabili in età evolutiva” per un trauma avvenuto in casa. All’esame obiettivo si nota una
severa lussazione intrusiva a carico dell’elemento 1 con corona vetiblo-inclinata; si propende pertanto per
l’estrazione. Il bambino non si presenta però ai follow-up.
01 febbraio 2010: in visita d’urgenza, Emanuele presenta dolore e gonfiore sia intra che extra-orale , a
seguito dei quali il pediatra ha prescritto terapia antibiotica. L’esame obiettivo mette in luce l’eruzione
dell’elemento 11 che appare ipoplasico e alterato di forma. Dal solco gengivale vestibolare fuoriesce
essudato purulento e la mucosa si presenta tumefatta. È presente un sondaggio >12 mm. Alla radiografia
endorale si apprezza una banda radiotrasparente, compatibile con una frattura. Si decide di realizzare una
chirurgia esplorativa per escludere questa diagnosi. Si evidenzia cosi la presenza di una doccia vestibolare,
ricostruita contestualmente in resina composita.
21 Aprile 2016: nuovamente in visita d’urgenza all’esame obiettivo si evidenzia una fistola vestibolare
all’elemento 11. Il test di sensibilità risulta negativo; la radiografia endorale mostra l’apice immaturo.
Diagnosi: lesione endo-perio a partenza parodontale. Pertanto si decide di trattare endodonticamente
l’elemento, utilizzando MTA, considerato il grado di formazione radicolare.
Conclusioni: nei casi di lussazione intrusiva in età molto precoce, la percentuale di complicanze che
coinvolgono la formazione ed eruzione dei denti permanenti è elevata. I genitori devono essere avvertiti
che la prognosi si potrà sciogliere solo alla comparsa in arcata degli elementi permanenti interessati
dall’evento traumatico
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
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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