1,294 research outputs found
“Sobre as mulheres, um silêncio que gritava”: duas décadas da primeira obra historiográfica sobre mulheres e Ditadura Militar no Brasil, entrevista com a professora Dra. Ana Maria Colling
Get PDFThe present interview seeks to portray and recall the more than two decades of publication of the work “The resistance of women to the Military Dictatorship in Brazil” published in 1997 by the historian Ana Maria Colling. Portraying the challenges in the field of history, as well as access to the repression documents then released, post-re-democratization, the interview merges the state of the art with the academic and intellectual trajectory of the author, which has become one of the most mentioned references in terms of thematic. I thank Professor Ana Maria Colling for kindly giving this interview, specifically for this Dossier, which is so significant nowadays.A presente entrevista busca retratar e rememorar as mais de duas décadas de publicação da obra “A resistência da mulher à Ditadura Militar no Brasil” publicado em 1997 pela Editora Rosa dos Tempos, escrita pela historiadora Ana Maria Colling. Retratando os desafios no campo da história, bem como o acesso aos documentos da repressão então liberados, pós-redemocratização, a entrevista mescla o estado da arte com a trajetória acadêmica e intelectual da autora, a qual se tornou umas das referências mais mencionadas em relação à temática ditadura e mulheres. Agradeço a professora Ana Maria Colling por ceder gentilmente essa entrevista, especificamente para este Dossiê, tão significativo e necessário nos dias atuais
Investigating partial least squares discriminant analysis and hierarchical modelling of short wave infrared hyperspectral imaging data to distinguish production area and quality of rooibos (Aspalathus linearis)
Get PDFShort wave infrared hyperspectral imaging was tested for its ability to distinguish rooibos tea (Aspalathus linearis) based on production area and quality grade, with the aim to replace time-consuming sensory analysis in the industry. The number of latent variables and model parameters of the calibration model were optimised by cross-validation. Classification error rates were used to evaluate the performance of the models in classifying rooibos based on production area and quality grade. The production area of rooibos was distinguished by applying a partial least square-discriminant analysis model with second derivative pre-processing, followed by mean centering and inclusion of nine LVs. The model could successfully distinguish between the two production areas and had a classification accuracy of 100% for the prediction set. To distinguish between different quality grades, a hierarchical model with second derivative pre-processing was developed. Grade A could be distinguished successfully from grades B, C and D (class BCD) with 100% accuracy and grade D could be distinguished from grades B and C (class BC) with 96% accuracy. However, the model was less accurate to distinguish between grade B and C samples, with prediction accuracies of 82 and 66% for B and C, respectively. Application of near infrared hyperspectral imaging therefore offers the potential to replace the use of sensory analysis in the rooibos tea industry to predict production area and quality grade of this herbal tea
Writing as improvisation of memory: Por los tiempos de Clemente Colling, by Felisberto Hernández
No full textEsta dissertação é uma tradução na íntegra e uma análise da obra Por los tiempos de Clemente Colling (1942), do escritor uruguaio Felisberto Hernández. O estudo é feito sobretudo a partir da perspectiva da improvisação musical como processo de escrita e de construção da memória. Através de uma abordagem teórico-crítica que inclui aproximações com a obra de Marcel Proust, investiga-se como o texto utiliza elementos como a fragmentação temporal, a memória involuntária e a relação entre visão, cegueira e audição para elaborar uma narrativa singular que, embora fragmentada, não é aleatória ou precária. Percorre-se também os aspectos estruturais da novela, mostrando como esse fluxo de memórias, associado a questões como a sintaxe nada ortodoxa e a atmosfera de mistério que a tudo recobre moldam a tessitura textual. Além disso, destaca-se a relação entre o autor, seus contemporâneos e a vanguarda, observando a maneira como ele reconfigura conceitos como colagem e deslocamento. Por fim, discute-se a tradução da obra como uma prática de improvisação e performanceThis dissertation presents a complete translation and an analysis of Por los tiempos de Clemente Colling (1942), a novel by the Uruguayan writer Felisberto Hernández. The study is primarily conducted from the perspective of musical improvisation as a process of writing and memory construction. Through a theoretical and critical approach – including comparisons with the work of Marcel Proust – the research examines how the text employs elements such as temporal fragmentation, involuntary memory, and the interplay between vision, blindness, and hearing to construct a singular narrative that, despite its fragmented nature, is neither random nor precarious. The study also explores the structural aspects of the novel, demonstrating how this flow of memories, combined with elements such as its unorthodox syntax and the pervasive atmosphere of mystery, shapes the textual fabric. Furthermore, the dissertation highlights the relationship between the author, his contemporaries, and the avant-garde, analyzing how he reconfigures concepts such as collage and displacement. Finally, it discusses the translation of the novel as a practice of improvisation and performanc
Design, statistical analysis and reporting standards for test accuracy studies for infectious diseases in animals: Progress, challenges and recommendations
No full textWorkplace violence in the emergency healthcare setting: balancing the needs of behavioral patients-in-crisis with the personal safety of hospital staff
Get PDFIncludes bibliographical references
Sterile neutrino fits to short baseline data
Get PDFNeutrino oscillation models involving extra mass eigenstates beyond the standard three (3+N) are fit to global short baseline experimental data. We find that 3+1 has a best fit of Δm[subscript 41][superscript 2] = 1.75 eV[superscript 2] with a Δχ[subscript null-min][superscript 2] (dof) of 52.34 (3). The 3+2 fit has a Δχ[subscript null-min][superscript 2] (dof) of 56.99 (7). For the first time, we show Bayesian credible intervals for a 3+1 model. These are found to be in agreement with frequentist intervals. The results of these new fits favor a higher Δm2 value than previous studies, which may have an impact on future sterile neutrino searches such as the Fermilab SBN program.National Science Foundation (U.S.) (Grant 1505858)National Science Foundation (U.S.) (Grant 1505855
Error probability and SINR analysis of optimum combining in Rician fading
No full textThis paper considers the analysis of optimum combining systems in the presence of both co-channel interference and thermal noise. We address the cases where either the desired-user or the interferers undergo Rician fading. Exact expressions are derived for the moment generating function of the SINR which apply for arbitrary numbers of antennas and interferers. Based on these, we obtain expressions for the symbol error probability with M-PSK. For the case where the desireduser undergoes Rician fading, we also derive exact closed-form expressions for the moments of the SINR. We show that these moments are directly related to the corresponding moments of a Rayleigh system via a simple scaling parameter, which is investigated in detail. Numerical results are presented to validate the analysis and to examine the impact of Rician fading on performance.</p
Achievable Sum Rate of MIMO MMSE Receivers: A General Analytic Framework
No full textThis paper investigates the achievable sum rate of multiple-input multiple-output (MIMO) wireless systems employing linear minimum mean-squared error (MMSE) receivers. We present a new analytic framework which exploits an interesting connection between the achievable sum rate with MMSE receivers and the ergodic mutual information achieved with optimal receivers. This simple but powerful result enables the vast prior literature on ergodic MIMO mutual information to be directly applied to the analysis of MMSE receivers. The framework is particularized to various Rayleigh and Rician channel scenarios to yield new exact closed-form expressions for the achievable sum rate, as well as simplified expressions in the asymptotic regimes of high and low signal-to-noise ratios (SNRs). These expressions lead to the discovery of key insights into the performance of MIMO MMSE receivers under practical channel conditions.</p
Optimum combining of Rician-faded signals: Analysis in the presence of interference and noise
No full textThis paper analyzes the performance of optimum
combining systems in the presence of both co-channel interference
and thermal noise, addressing the case where the desireduser
undergoes Rician fading. Exact expressions are derived for
the moment generating function of the SINR which apply for
arbitrary numbers of antennas and interferers. Based on these,
we obtain expressions for the symbol error probability with
M-PSK. We also derive exact closed-form expressions for the
moments of the SINR, and show that they are directly related
to the corresponding moments of a Rayleigh system via a simple
scaling parameter. Numerical results are presented to validate
the analysis, and to examine the impact of Rician fading
No evidence for a core deficit in developmental dyscalculia or mathematical learning disabilities
Get PDFBackground: Two hypotheses were tested regarding the characteristics of children with mathematical learning disabilities (MLD): (a) that children with MLD would have a ‘core deficit’ in basic number processing skills; and (b) that children with MLD would be at the end of a developmental continuum and have impairments in many cognitive skills. Methods: From a large sample (N = 1,303) of typically developing children, we selected a group definable as having MLD. The children were given measures of basic number processing and domain-general constructs. Differences between the observed sample and a simulated population were estimated using Cohen’s d and Bayes factors. Receiver operating characteristic curves were plotted, and the area under the curve was computed to ascertain the diagnostic power of measures. Results: Results suggest that the differences between the MLD and control group can be defined along with general characteristics of the population rather than assuming single or multiple ‘core deficits’. None of the measures of interest exceeded the diagnostic power that could be derived via simulation from the dimensional characteristics of the general population. Conclusions: There is no evidence for core deficit(s) in MLD. We suggest that future research should focus on representative samples of typical populations and on carefully tested clinical samples confirming to the criteria of international diagnostic manuals. Clinical diagnoses require that MLD is persistent and resistant to intervention, so studies would deliver results less exposed to measurement fluctuations. Uniform diagnostic criteria would also allow for the easy cross-study comparison of samples overcoming a serious limitation of the current literature
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