How to attract volunteers to Refood´S central structure in Lisbon?

This project applies the VCW- Value Creation Wheel- to Refood, a non-profit organization based in Portugal that aims to reduce and eliminate food waste and hunger by distributing food to the ones in need. The VCW was applied to their problem: How to recruit volunteers to Refood’s central structure in Lisbon? By applying the VCW, this project was able to find three potential ways and sources of volunteers. These ideas were selected after following the creation of diversified sources of ideas and filters. They were the ones with the highest potential and a plan of action was detailed to implement them. This project highlights the major challenges when attracting volunteers, as well as the main challenges and procedures to be taken for the long-term sustainability of the solution

Sparse distributed representations as word embeddings for language understanding

Word embeddings are vector representations of words that capture semantic and syntactic similarities between them. Similar words tend to have closer vector representations in a N dimensional space considering, for instance, Euclidean distance between the points associated with the word vector representations in a continuous vector space. This property, makes word embeddings valuable in several Natural Language Processing tasks, from word analogy and similarity evaluation to the more complex text categorization, summarization or translation tasks. Typically state of the art word embeddings are dense vector representations, with low dimensionality varying from tens to hundreds of floating number dimensions, usually obtained from unsupervised learning on considerable amounts of text data by training and optimizing an objective function of a neural network. This work presents a methodology to derive word embeddings as binary sparse vectors, or word vector representations with high dimensionality, sparse representation and binary features (e.g. composed only by ones and zeros). The proposed methodology tries to overcome some disadvantages associated with state of the art approaches, namely the size of corpus needed for training the model, while presenting comparable evaluations in several Natural Language Processing tasks. Results show that high dimensionality sparse binary vectors representations, obtained from a very limited amount of training data, achieve comparable performances in similarity and categorization intrinsic tasks, whereas in analogy tasks good results are obtained only for nouns categories. Our embeddings outperformed eight state of the art word embeddings in word similarity tasks, and two word embeddings in categorization tasks.A designação word embeddings refere-se a representações vetoriais das palavras que capturam as similaridades semânticas e sintáticas entre estas. Palavras similares tendem a ser representadas por vetores próximos num espaço N dimensional considerando, por exemplo, a distância Euclidiana entre os pontos associados a estas representações vetoriais num espaço vetorial contínuo. Esta propriedade, torna as word embeddings importantes em várias tarefas de Processamento Natural da Língua, desde avaliações de analogia e similaridade entre palavras, às mais complexas tarefas de categorização, sumarização e tradução automática de texto. Tipicamente, as word embeddings são constituídas por vetores densos, de dimensionalidade reduzida. São obtidas a partir de aprendizagem não supervisionada, recorrendo a consideráveis quantidades de dados, através da otimização de uma função objetivo de uma rede neuronal. Este trabalho propõe uma metodologia para obter word embeddings constituídas por vetores binários esparsos, ou seja, representações vetoriais das palavras simultaneamente binárias (e.g. compostas apenas por zeros e uns), esparsas e com elevada dimensionalidade. A metodologia proposta tenta superar algumas desvantagens associadas às metodologias do estado da arte, nomeadamente o elevado volume de dados necessário para treinar os modelos, e simultaneamente apresentar resultados comparáveis em várias tarefas de Processamento Natural da Língua. Os resultados deste trabalho mostram que estas representações, obtidas a partir de uma quantidade limitada de dados de treino, obtêm performances consideráveis em tarefas de similaridade e categorização de palavras. Por outro lado, em tarefas de analogia de palavras apenas se obtém resultados consideráveis para a categoria gramatical dos substantivos. As word embeddings obtidas com a metodologia proposta, e comparando com o estado da arte, superaram a performance de oito word embeddings em tarefas de similaridade, e de duas word embeddings em tarefas de categorização de palavras

Relatório de estágio em bioestatística

Mestrado em Biomedicina FarmacêuticaEste relatório descreve a minha experiência de 9 meses enquanto estagiário na Eurotrials, Consultores Científicos, uma Empresa especializada em investigação clínica e consultoria científica. Este estágio desenrolou-se em duas vertentes: formação multidisciplinar e monodisciplinar. A formação multidisciplinar envolveu alguma forma de participação activa em diferentes departamentos desta Empresa, com o objectivo de obter uma perspectiva alargada do processo multidisciplinar inerente ao desenvolvimento clínico de produtos de saúde. A formação monodisciplinar concentrou-se na área de estatística médica, sendo realizada no departamento de Bioestatística da Empresa, com o objectivo de obter conhecimentos práticos de aplicação da estatística à investigação em saúde, implicando também a interiorização de conceitos estatísticos fundamentais. Este estágio permitiu-me compreender de forma mais aprofundada o trabalho multidisciplinar necessário para a realização adequada de um projecto de investigação clínica. Permitiu-me também não só adquirir conhecimentos importantes de análise estatística, mas também compreender, de forma mais clara, o papel da estatística na investigação clínica, como ferramenta essencial no planeamento do estudo, análise e interpretação dos dados obtidos.This report describes my experience of 9 months as an intern at Eurotrials, Scientific Consultants, a company devoted to clinical research and scientific consulting. This internship developed in two aspects: multidisciplinary and monodosciplinary training. Multidisciplinary training involved active participation in different departments of this Company, with the objective of obtaining a broad perspective on the multidisciplinary process of the clinical development of medical products. Monodisciplinary training was focused in medical statistics, being carried out in the Biostatistics department of the Company. The objective was to obtain practical knowledge for the application of statistics in health sciences. This implied the learning of fundamental statistical concepts. This internship allowed me to understand, in depth, the multidisciplinary work necessary for an adequate performance of a clinical research project. It also allowed me to acquire valuable knowledge in statistical analysis, as well as to clearly understand the role of statistics in clinical research, as an essential tool in study planning, analysis and interpretation of data obtained

Discretization-dependent model for weakly connected excitable media

Pattern formation has been widely observed in extended chemical and biological processes. Although the biochemical systems are highly heterogeneous, homogenized continuum approaches formed by partial differential equations have been employed frequently. Such approaches are usually justified by the difference of scales between the heterogeneities and the characteristic spatial size of the patterns. Under different conditions, for example, under weak coupling, discrete models are more adequate. However, discrete models may be less manageable, for instance, in terms of numerical implementation and mesh generation, than the associated continuum models. Here we study a model to approach discreteness which permits the computer implementation on general unstructured meshes. The model is cast as a partial differential equation but with a parameter that depends not only on heterogeneities sizes, as in the case of quasicontinuum models, but also on the discretization mesh. Therefore, we refer to it as a discretization-dependent model. We validate the approach in a generic excitable media that simulates three different phenomena: the propagation of action membrane potential in cardiac tissue, in myelinated axons of neurons, and concentration waves in chemical microemulsions.We acknowledge the support from CAPES, grant 88881.065002/2014-01 of the Brazilian program Science without borders, FAPEMIG, CNPq, UFJF, and from MINECO of Spain under the Ramon y Cajal program, grant number RYC-2012-11265Peer ReviewedPostprint (published version

Influence of the Impeller Speed on Phosphate Rock Flotation

Flotation represents, at present, the technology capable of efficiently concentrate the minerals of interest, separating them from other gangue minerals. The flotation process is based on interactions between minerals (solid phase), water (liquid phase), and air (gas phase). However, it depends on physical forces driving the system. If mineral particles do not have enough momentum during the collision with the air bubble no attachment between them occurs, and consequently no flotation. Impeller rotation speed is undoubtedly a factor that changes the hydrodynamic conditions of the flotation system playing a vital role on it. It supplies the flotation system with air by suction, produces bubbles on the base of the cell, and stirs the pulp. By keeping the mineral particles in movement, the impeller rotation avoid fast sedimentation of the particles and gives the energy required for the particles attach themselves to the bubble. Although the impeller rotation has very high importance to the flotation, it also has a negative action on the system since it is one of the greater producer of turbulence in the flotation cell. The better understand the influence of the impeller rotation speed in the phosphate rock flotation experiments using a Denver cell with 3.0L cell were carried out using phosphate rock from Copebras/CMOC mine, a magmatic deposit situated in Ouvidor/GO/Brazil. Cornstarch (600 g/t) supplied by Cargill was used as depressant and Lioflot 502-A (500 g/t), a mix of fatty acids, supplied by Miracema-Nuodex was used as collector. The conditioning time was three minutes for the depressant and two minutes for the collector and flotation time was five minutes. The pH was kept at 9 with hydrochloric acid and sodium hydroxide, both at 1%. Five different impeller speeds were tested (1000, 1150, 1300, 1450, and 1600 RPM). All tests were performed in triplicate at room temperature and using tap water. Samples of the feed, concentrate and tailings were analyzed at Copebras S/A laboratory using an X-ray Fluorescence spectrometer AXIOX MAX series DY 5001 from PANalytical. Results show that an increasing in the impeller speed until 1450 RPM produces a reduction in the P2O5 content in the concentrate. Above this value the P2O5 content raises with the impeller speed. The higher grade obtained was around 34% of P2O5 at 1600 RPM

Dynamics of a gyrostat satellite with the vector of gyrostatic moment tangent to the orbital plane

In this paper, a gyrostat satellite in a circular orbit with its gyrostatic moment tangent to the orbital plane and collinear with the orbital speed is studied regarding its equilibria, bifurcation of equilibria, and asymptotic stability conditions. In the general case, where any gyrostat angular momentum is aligned with any of the orbital coordinate frames, interesting results arose regarding its equilibria bifurcation regarding conditions near to the ones presented in this paper, namely equilibria regions outside their main regions near to the orbital plane tangent. For equilibria and bifurcation of equilibria, a symbolic-numerical method is used to obtain the polynomial equations in function of non-dimensional parameters whose roots are equivalent to the number of equilibria positions. For the asymptotic stability, the results are tested using the Lyapunov stability theory scheme

Narratives about the insertion of male teachers in the early childhood education: deviant sexualities, heteronormativity and masculinization of the education

Based on the theoretical and methodological assumptions of Oral History and Gender as an analytical category, this article analyzes the insertion of male teachers in Early Childhood Education. Two physical education teachers and two directors of the private school system participated in this study. From the memories of the deponents it was possible to perceive that the presence of men in Early Childhood Education was legitimized by the \u27need\u27 of a masculine reference for the children. Despite this, the deponents reported that they had their sexuality put under suspicion, after all, they would be breaking gender norms for the male gender

Dynamics of gyrostat satellite subject to gravitational torque: Investigation of equilibria

Dynamics of gyrostat satellite moving along a circular orbit in the central Newtonian gravitational field is investigated. A symbolic-numerical method for determining all equilibrium orientations of gyrostat satellite in the orbital coordinate system with given gyrostatic torque and given principal central moments of inertia is proposed. Conditions of equilibriums existence are obtained depending on four dimensionless parameters of the system. All bifurcational values of parameters at which there is a change of numbers of equilibrium orientations are determined. Evolution of domains in the space of parameters which correspond to various numbers of equilibria are carried out in detail. Relationship with axisymmetrical cases of satellite gyrostat is considered. It is shown that the number of equilibria of the gyrostat satellite in general case not be less than 8 and not more than 24.Исследована динамика спутника-гиростата, движущегося в центральном ньютоновом силовом поле по круговой орбите. Предложен метод определения всех положений равновесия спутника-гиростата в орбитальной системе координат при заданных значениях вектора гиростатического момента и главных центральных моментов инерции и получены условия их существования в зависимости от четырех безразмерных параметров системы. Найдены бифуркационные значения параметров, при которых изменяется число положений равновесия. Проведен детальный численный анализ эволюции областей существования различного числа равновесий в пространстве безразмерных параметров. Рассмотрена взаимосвязь полученных областей существования с областями существования равновесий осесимметричного спутника. Показано, что число положений равновесия спутника-гиростата в общем случае не превышает 24 и не может бытьменьше 8.Fundação para a Ciência e a Tecnologiainfo:eu-repo/semantics/publishedVersio

ARCHI: pipeline for light curve extraction of CHEOPS background star

High precision time series photometry from space is being used for a number of scientific cases. In this context, the recently launched CHEOPS (ESA) mission promises to bring 20 ppm precision over an exposure time of 6 hours, when targeting nearby bright stars, having in mind the detailed characterization of exoplanetary systems through transit measurements. However, the official CHEOPS (ESA) mission pipeline only provides photometry for the main target (the central star in the field). In order to explore the potential of CHEOPS photometry for all stars in the field, in this paper we present archi, an additional open-source pipeline module{\dag}to analyse the background stars present in the image. As archi uses the official Data Reduction Pipeline data as input, it is not meant to be used as independent tool to process raw CHEOPS data but, instead, to be used as an add-on to the official pipeline. We test archi using CHEOPS simulated images, and show that photometry of background stars in CHEOPS images is only slightly degraded (by a factor of 2 to 3) with respect to the main target. This opens a potential for the use of CHEOPS to produce photometric time series of several close-by targets at once, as well as to use different stars in the image to calibrate systematic errors. We also show one clear scientific application where the study of the companion light curve can be important for the understanding of the contamination on the main target.Comment: 14 pages, 13 figures, accepted for publication in MNRAS, all code available at https://github.com/Kamuish/arch

Dynamics of gyrostat satellite subject to gravitational torque: Stability analysis

Dynamics of gyrostat satellite moving along a circular orbit in the central Newtonian gravitational field is investigated. A symbolic-numerical method for determining of all equilibrium orientations of gyrostat satellite in the orbital coordinate system with given gyrostatic torque and given principal central moments of inertia is proposed. For each equilibrium orientation sufficient conditions of stability are obtained as a result of analysis of generalized energy integral used as Lyapunov’ function. Investigation of domains where stability conditions take place is provided in detail depending on four dimensionless parameters of the problem. It is shown that the number of stable equilibria of the gyrostat satellite in general case changes from 8 to 4 with the increasing the absolute value of gyrostatic torque.Исследована динамика спутника-гиростата, движущегося в центральном ньютоновом силовом поле по круговой орбите. Предложен метод определения всех положений равновесия спутника-гиростата в орбитальной системе координат при заданных значениях вектора гиростатического момента и главных центральных моментов инерции, получены условия их существования. Для каждой равновесной ориентации получены достаточные условия устойчивости с использованием в качестве функции Ляпунова обобщенного интеграла энергии. Проведен детальный численный анализ областей выполнения условий устойчивости положений равновесия в зависимости от четырех безразмерных параметров задачи. Показано, что число положений равновесия спутника-гиростата, для которых выполняются достаточные условия устойчивости, в общем случае изменяется при возрастании величины модуля гиростатического момента от 4 до 2.Fundação para a Ciência e a Tecnologiainfo:eu-repo/semantics/publishedVersio