Portuguese Adaptation of Students Engagement in Schools International Scale (SESIS)

The importance of student’s engagement has been recently pointed out in research. However, there has been a lack of engagement assessment instrument, pertaining psychometric qualities. Objective: This paper presents the Portuguese adaptation of the “Student’s Engagement in School International Scale” (SESIS), drawn up from a12 countries international study (Lam et al., 2012; Lam et al., in press). Method: Psychometric properties of this scale were examined with data from 685 students from different grades (6th, 7th, 9th and 10th), from both sexes, and different regions of the country. Results: Factorial analysis of the results, with varimax rotation, lead to three different factors which explain 50.88% of the variance. The scale integrates the original 33 items, and cognitive, affective and behavioural dimensions. For the external validity study, the relationship between student’s engagement in school results and other school variables — academic performance, self-concept — was considered, and significant relations were observed, as expected. Conclusion: The data presented highlights the qualities of SESIS, as well as its usefulness for research purposes. Suggestion: It is suggested the investigation of the extension of SESIS’s three-dimensionality, in future studiesKeywords: Innovation, technology, research projects, etc. [Arial 10-point, justified alignment]

Measurement of residual stresses in dissimilar friction stir-welded aluminium and copper plates using the contour method

The longitudinal residual stresses in the friction stir-welded plates of 5A06 aluminium and pure copper were determined using the contour method. The results revealed the presence of high tensile and compressive residual stresses on the aluminium and copper sides, respectively. The residual stresses were detected on the weld zone as well as the thermo-mechanically affected zone (TMAZ) of the aluminium plate. In contrast, the compressive residual stresses in the copper plate had a much narrower width along the weld line. Peak tensile stresses up to 240 MPa were found in the TMAZ of the aluminium plate

Coleta de germoplasma de arroz no Amazonas e Acre.

Made available in DSpace on 2014-02-13T22:25:53Z (GMT). No. of bitstreams: 1 LavouraArrozeira.pdf: 2810472 bytes, checksum: 7b83068120ac389365800fd3e0f65e41 (MD5) Previous issue date: 2014-02-06198

Severe Megaloblastic Anaemia in an Infant

Vitamin B 12 or cobalamin deficiency, a rare clinical entity in pediatric age, is found most exclusively in breastfed infants, whose mothers are strictly vegetarian non-supplemented or with pernicious anaemia. In this article, the authors describe a 10-month-old infant admitted for vomiting, refusal to eat and prostration. The infant was exclusively breastfed and diffi culties in introduction of new foods were reported. Failure to thrive since 5 months of age was also noticed. Laboratory evaluation revealed severe normocytic normochromic anaemia and cobalamin defi cit. A diagnosis of α-thalassemia trait was also made. Maternal investigation showed autoimmune pernicious anaemia. This case shows the severity of vitamin B 12 deficiency and the importance of adopting adequate and precocious measures in order to prevent potentially irreversible neurologic damage

Excitons and stacking order in h-BN

The strong excitonic emission at 5.75 eV of hexagonal boron nitride (h-BN) makes this material one of the most promising candidate for light emitting devices in the far ultraviolet (UV). However, single excitons occur only in perfect monocrystals that are extremely hard to synthesize, while regular h-BN samples present a complex emission spectrum with several additional peaks. The microscopic origin of these additional emissions has not yet been understood. In this work we address this problem using an experimental and theoretical approach that combines nanometric resolved cathodoluminescence, high resolution transmission electron microscopy and state of the art theoretical spectroscopy methods. We demonstrate that emission spectra are strongly inhomogeneus within individual flakes and that additional excitons occur at structural deformations, such as faceted plane folds, that lead to local changes of the h-BN stacking order

Quantum circuits to measure scalar spin chirality

The scalar spin chirality is a three-body physical observable that plays an outstanding role both in classical magnetism, characterizing non-co-planar spin textures, and in quantum magnetism, as an order parameter for chiral spin liquids. In quantum information, the scalar spin chirality is a witness of genuine tripartite entanglement. Here we propose an indirect measurement scheme, based on the Hadamard test, to estimate the scalar spin chirality for general quantum states. We apply our method to study chirality in two types of quantum states: generic one-magnon states of a ferromagnet, and the ground state of a model with competing symmetric and antisymmetric exchange. We show a single-shot determination of the scalar chirality is possible for chirality eigenstates, via quantum phase estimation with a single auxiliary qutrit. Our approach provides a unified theory of chirality in classical and quantum magnetism.L.I.R. thanks the New Talents program of Fundação Calouste Gulbenkian for financial support. B.M. acknowledges financial support from Fundação para a Ciência e a Tecnologia (FCT)—Portugal through the Ph.D. scholarship No. SFRH/BD/08444/2020. E.F.G. acknowledges support from FCT via project CEECINST/00062/2018, and from the Digital Horizon Europe project FoQaCiA, GA No. 101070558. J.F.R. acknowledges financial support from FCT (Grant No. PTDC/FIS-MAC/2045/2021), Science National Foundation (Switzerland) Sinergia (Grant Pimag), Generalitat Valenciana funding Prometeo2021/017 and MFA/2022/045, and funding from MICIIN-Spain (Grant No. PID2019-109539GB-C41)

Quantum circuits to measure scalar spin chirality

The scalar spin chirality is a three-body physical observable that plays an outstanding role both in classical magnetism, characterizing non-coplanar spin textures, and in quantum magnetism, as an order parameter for chiral spin liquids. In quantum information, the scalar spin chirality is a witness of genuine tripartite entanglement. Here we propose an indirect measurement scheme, based on the Hadamard test, to estimate the scalar spin chirality for general quantum states. We apply our method to study chirality in two types of quantum states: generic one-magnon states of a ferromagnet, and the ground state of a model with competing symmetric and antisymmetric exchange. We show a single-shot determination of the scalar chirality is possible for chirality eigenstates, via quantum phase estimation with a single auxiliary qutrit. Our approach provides a unified theory of chirality in classical and quantum magnetism.Comment: 5 pages, 3 figure

El Tamaño y la posición de los web banners publicitarios y su recuperación de la memoria episódica : un análisis desde el enfoque del procesamiento de la información /

A partir de las investigaciones desarrolladas y de los experimentos realizados, pasamos a presentar un resumen del incremento científico de la tesis doctoral. 1) Una definición concreta y robusta del concepto de web banner publicitario. Según nosotros, el web banner es un formato publicitario construido con aplicaciones informáticas específicas, preparadas para la manipulación multimedia y para el manejo de lenguajes específicos, de forma a aumentar las calidades funcionales del banner mediante rutinas de Javascript, Dhtml y Apletts de Java. Los materiales multimedia involucrados en la construcción de los banners pueden ser de naturaleza visual y sonora. En el ámbito de los tamaños, el Interactive Advertising Bureau ha estandarizado catorce tamaños que facilitan su explotación por las redes publicitarias que operan en Internet, proporcionando al anunciante la posibilidad de colocar sus banners en los más diversos lugares de las páginas web. 2) Una taxonomía del objeto de estudio. Después de analizar profundamente el panorama actual de los banners publicitarios, pensamos que existen básicamente dos categorías de banners: los simples y los elaborados. Entendemos por banners publicitarios simples, los banners que presentan un conjunto de contenidos estáticos y/o animados con la función principal de direccionar el usuario hacia el web site del anunciante. En la categoría de los banners publicitarios elaborados, reconocemos los banners programados en Dhtml/Javascript, en Java, en Flash/Director/Generator y los banners con programación combinada. 3) Un modelo de abordaje del procesamiento de los banners desde la exposición hasta la formación, sedimentación o alteración de actitudes. La configuración de nuestra propuesta fue estudiada de forma que fuera posible plasmar un procesamiento dinámico, paralelo e independiente de las variables presentes en los distintos formatos publicitarios. En el modelo de la probabilidad de elaboración modificado no existe la distinción entre los elementos procesados por vía central o por vía periférica, pero una única vía de procesamiento generadora de diferentes intensidades de actitudes positivas, negativas o neutras, resultado de las interpretaciones y elaboraciones del sujeto frente al estimulo publicitario. 4) Un modelo de construcción de los banners publicitarios interactivos. El banner como formato publicitario es el producto del pensamiento estratégico, creativo y técnico orientado para la interpretación colectiva. 5) Un método de determinación formal de las posiciones en la pantalla. La situación de variabilidad de las pantallas y de las páginas web nos ha obligado a pensar en un marco de análisis invariable para el sistema hipermedia experimental (el cuadro pantalla). 6) Un modelo de contrastación de la eficacia cognitiva de los banners publicitarios. Las hipótesis operativas de esta investigación han sido planteadas según el binomio causa-efecto, situación que ha motivado la utilización de un diseño factorial 2x2 de grupos independientes y de tratamientos experimentales completamente aleatorizados. A modo de resumen general del incremento científico, y mediante un test de hipótesis, hemos verificado que los distintos grupos independientes recuerdan, por lo menos, una de las variables independientes de los banners publicitarios. Los sujetos experimentales recuerdan la posición del banner y, simultáneamente, el tamaño y la posición del banner publicitario. Es decir, el sujeto recuerda los artefactos comunicativos en función de su posición, siendo el tamaño directamente influenciado por la posición del artefacto en el cuadro pantalla.From de investigations developed and the tests realised, we next present an abstract of our findings. 1) A robust definition of the concept of advertising web banner. The web banner is an advertising form built with specific computing applications, prepared for multimedia handling and to utilise specific languages, in such a way to increase the functional qualities of the banner by means of Javascript, Dhtml and Java Applets routines. The multimedia materials involved in the construction of the banners may have a visual or sonorous nature. In the scope of sizes, the Interactive Advertising Bureau has standardised fourteen sizes that make easier their exploration by the advertising network which operates through Internet, providing the advertiser the possibility to locate their banners in the diverse positions of the web page. 2) A taxonomy for the object of our study. After a deep analysis of the actual panorama of advertising web banners, we think there are basically two kind of banner categories: the simple ones and the elaborated. Simple advertising web banners are those that present a whole static and/or animated content which main function is to guide the user into the web banner of the advertiser. The elaborated category include those programmed in Dhtml/Javascript, Java, Flash/Director/Generator and the banners with combined programming. 3) An approach model to banner processing from the exposure to the creation, maintaining or changing of attitudes. The configuration of our proposal was studied in such a way to make possible to model a dynamic, parallel and independent processing of the variables present at the different interactive ad formats. In the Modified Elaborated Likelihood Model there is no distinction between the elements processed by central or peripheric way, but only one processing way to generate the different intensities of positive, negative or neutral attitudes, as a result of the interpretations of the subject in front of advertising stimulus. 4) A construction model of interactive advertising web banners. The banner as an ad format is the result of strategic, creative and technical thinking oriented to collective interpretation. 5) A formal method to determine positions in the display. The diversity of display and web pages obliged us to think about an invariable benchmark to the hypermedia experimental system. 6) A checking model of ad banner cognitive effectiveness. Our study hypothesis has been made according to a cause-effect approach, which has motivated us to use factorial design 2x2 of independent groups and random experimental treatments. To make a general summary of our findings, through a test hypothesis we verified that the different independent groups remember, at least one of the independent variables of ad banners. Individuals that participated in the experiment remember web banner position and, simultaneously, it's size and position. That is, individuals remember ad banners in function of their position, and it's size is directly influenced by it's position in the display

Electric field inversion asymmetry: Rashba and Stark effects for holes in resonant tunneling devices

We report experimental evidence of excitonic spin-splitting, in addition to the conventional Zeeman effect, produced by a combination of the Rashba spin-orbit interaction, Stark shift and charge screening. The electric-field-induced modulation of the spin-splitting are studied during the charging and discharging processes of p-type GaAs/AlAs double barrier resonant tunneling diodes (RTD) under applied bias and magnetic field. The abrupt changes in the photoluminescence, with the applied bias, provide information of the charge accumulation effects on the device.Comment: 4 pages, 2 figure