1,377 research outputs found
Rikke D. Giles, Roman Soldiers and the Roman Army. A Study of Military Life from Archaeological Remains, Oxford, Archaeopress, 2012 (British Archaeological Reports, British Series, 562)
No full textColling David. Rikke D. Giles, Roman Soldiers and the Roman Army. A Study of Military Life from Archaeological Remains, Oxford, Archaeopress, 2012 (British Archaeological Reports, British Series, 562). In: L'antiquité classique, Tome 84, 2015. pp. 519-520
Predictors of mathematics in primary school: Magnitude comparison, verbal and spatial working memory measures
No full textWe determined the relative importance of the so-called approximate number system (ANS), symbolic number comparison (SNC) and verbal and spatial short-term and working memory (WM) capacity for mathematics achievement in 1,254 Grade 2, 4 and 6 children. The large sample size assured high power and low false report probability and allowed us to determine effect sizes precisely. We used reading decoding as a control outcome measure to test whether findings were specific to mathematics. Bayesian analysis allowed us to provide support for both null and alternative hypotheses. We found very weak zero-order correlations between ANS measures and math achievement. These correlations were not specific to mathematics, became non-significant once intelligence was considered and ANS measures were not selected as predictors of math by regression models. In contrast, overall SNC accuracy and spatial WM measures were reliable and mostly specific predictors of math achievement. Verbal short-term and WM and SNC reaction time were predictors of both reading and math achievement. We conclude that ANS tasks are not suitable as measures of math development in school-age populations. In contrast, all other cognitive functions we studied are promising markers of mathematics development
“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
No full textThe 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
D-Zero Colling Loops
No full textThis report provides the necessary sizing for the LN{sub 2} cooling coils in the D-Zero cryostats. Natural convection from finned tubes will be the means of cooling the cryostats and their contents until such time as liquid can be made by condensing. Each cryostat will contain three separate cooling runs. Two runs will be cooldown and the other steady state. These runs will be placed in each cryostat as shown in figure 3, 4a and 4b. By assuming a 100 K tube wall temperature, tube diameter (3/4-inch) and wall thickness (0.065-inch) and the total length of tube (2 x 2940-inch + 1463-inch), the heat transfer can be calculated. Table 1 was calculated from relations in 'Handbook of Heat transfer Fundamentals' for free convection, pages 6-34 through 6-40
No evidence for a core deficit in developmental dyscalculia or mathematical learning disabilities
No full textBackground: 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
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
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)
No full textShort 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
Goodness-of-fit tests in semiparametric transformation models using the integrated regression function
No full textConsider the following semiparametric transformation model Λθ (Y) = m(X) + ε, where X is a d-dimensional covariate, Y is a univariate dependent variable and ε is an error term with zero mean and which is independent of X. We assume that m is an unknown regression function and that {Λθ : θ ∈ Θ} is a parametric family of strictly increasing functions. We use a profile likelihood estimator for the parameter θ and a local polynomial estimator for m. Our goal is to develop a new test for the parametric form of the regression functionm, which has power against local directional alternatives that converge to the null model at parametric rate, and to compare its performance to that of the test proposed by Colling and Van Keilegom (2016). The idea of the new test is to compare the integrated regression function estimated in a semiparametric way to the integrated regression function estimated under the null hypothesis. We consider two different test statistics, a Kolmogorov–Smirnov and a Cramér–von Mises type statistic, and establish the limiting distributions of these two test statistics under the null hypothesis and under a local alternative. We use a bootstrap procedure to approximate the critical values of the test statistics under the null hypothesis. Finally, a simulation study is carried out to illustrate the performance of our testing procedure, to compare this new test to the previous one and to see under which model conditions which test behaves the best. We also apply both methods on a real data set
Retificadores monofásicos e trifásicos com carga diferencial controlados por regime de deslizamento
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.Este trabalho apresenta o estudo de dois retificadores abaixadores, um monofásico e sua versão trifásica, além de elaborar o projeto e construção do retificador trifásico proposto por Colling e Barbi. As principais características destes retificadores são: empregar células de comutação tradicionais, permitir a transferência de energia em forma bidirecional, por meio da inversão dos sinais de referência, obter uma tensão de saída menor, igual ou maior que sua tensão de entrada e conseguir uma baixa THD e um elevado fator de potência para a corrente alternada na entrada. Os conversores são analizados como conexões de subconversores independentes, controlados por regime de deslizamento com esquema de comutação descentralizado. Este controle permite obter um sistema mais robusto e de fácil implementação. Na parte inicial do trabalho, faz-se uma revisão das topologias propostas, que operam com carga ligada em forma diferencial, elaboradas no Instituto de Eletrônica de Potência da UFSC. Posteriormente, apresenta-se a análise matemática, resultados de simulações numéricas dos diversos retificadores propostos e os resultados de ensaios dos retificadores, monofásico e trifásico implementados neste trabalho. This work presents the study of two step-down rectifiers, a single-phase and its three-phase version, in addition to develop the design and implementation of the three-phase rectifier proposed by Colling and Barbi. The main characteristics of these rectifiers are: to use of conventional switching cells, to allow the bidirectional energy transfer, through the inversion of the reference signal, to obtain an output voltage lower, equal or larger than the peak value of the input voltage and to achieve a reduction of input current THD and a high power factor. The converters are analyzed as a connection of independent subconverters, controlled by sliding mode with decentralized switching scheme. This control, allows to obtain a robust system and a straightforward implementation. Initially a revision of the proposed topologies that operate with differential load connected is done in the research of the Power Electronics Institute of the UFSC. Subsequently, mathematical analyses are shown, resulted from numerical simulations of the different proposed rectifiers and the experimental results of the rectifiers tests, for both, single-phase and three-phase versions implemented in this work
Felisberto Hernández: a (des) ordem da memória
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Literatura, Florianópolis, 2014.Este trabalho propõe o estudo da memória e da ruína em alguns escritos de Felisberto Hernández (1902-1964) valendo-se, para tanto, de um corpus composto principalmente pelos seguintes textos: Por los tiempos de Clemente Colling (1942), El caballo perdido (1943) e Tierras de la Memoria (1944-1965). Pretende-se neles verificar como se dá a problematização da ruína encontrada, entendida como fragmentos de tempo e espaço, ou objetos de memória, o que desencadeia a leitura benjaminiana das imagens que se abrem contrariamente para um tempo anacrônico. Este tempo disjuntivo e tensionado entre Cronos e Aion, resulta do que Jacques Rancière percebe no escritor que viaja pelos labirintos do mundo social e, mais tarde, pelos labirintos do "eu". Para tanto, proponho este estudo partindo das reflexões de Walter Benjamin, que problematiza o tempo ao escovar a história a contrapelo, e que também assim é entendida como um método de trabalho.Resumen : Este trabajo propone el estudio de la memoria e de la ruina en algunos escritos de Felisberto Hernández (1902-1964), donde se utilizará un corpus compuesto principalmente por los siguientes textos: Por los tiempos de Clemente Colling (1942), El caballo perdido (1943) e Tierras de la Memoria (1944-1965). Se pretende verificar en ellos como se da la problematización de la ruina encontrada, entendida como fragmentos de tiempo y espacio, u objetos de la memoria, lo que desencadena la lectura benjaminiana de las imágenes que se abren contrariamente para un tiempo anacrónico. Este tiempo disyuntivo y tensionado entre Cronos y Aion, resulta de lo que Jacques Rancière percibe en el escritor que viaja por los laberintos del mundo social y, más tarde, por los laberintos del "yo". Para tal, propongo este estudio partiendo de las reflexiones de Walter Benjamin, que problematiza el tiempo al cepillar la historia a contrapelo, y que también así es entendido como un método de trabajo
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