PELESent: Cross-domain polarity classification using distant supervision

The enormous amount of texts published daily by Internet users has fostered the development of methods to analyze this content in several natural language processing areas, such as sentiment analysis. The main goal of this task is to classify the polarity of a message. Even though many approaches have been proposed for sentiment analysis, some of the most successful ones rely on the availability of large annotated corpus, which is an expensive and time-consuming process. In recent years, distant supervision has been used to obtain larger datasets. So, inspired by these techniques, in this paper we extend such approaches to incorporate popular graphic symbols used in electronic messages, the emojis, in order to create a large sentiment corpus for Portuguese. Trained on almost one million tweets, several models were tested in both same domain and cross-domain corpora. Our methods obtained very competitive results in five annotated corpora from mixed domains (Twitter and product reviews), which proves the domain-independent property of such approach. In addition, our results suggest that the combination of emoticons and emojis is able to properly capture the sentiment of a message.Comment: Accepted for publication in BRACIS 201

Systematic Review on Project Actuality

Nowadays much is written about how to manage projects, but too little on what really happens in project actuality. Project Actuality came out in the Rethinking Project Management (RPM) agenda in 2006 and it aims at understanding what really happens at project context. To be able to understand project actuality phenomenon, we first need to get a better comprehension on its definition and discover how to observe it and analyse it. This paper presents the results of the systematic review conducted to collect evidence on Project Actuality. The research focused on four search engines, in publications from 1994 to 2013. Among others, the study concludes that project actuality has been analysed by several methods and techniques, mostly on large organization and public sectors, in Northern Europe. The most common definitions, techniques, and tips were identified as well as the intent of transforming the results in knowledge.Comment: 13 pages in International Journal of Computer Science & Information Technology Vol 6 No 5 October 201

Land use, landscape fragmentation, and water quality in a small watershed

A intensidade de uso e ocupação do solo e a fragmentação da paisagem, estimadas através de técnicas de processamento de imagens de satélite, foram relacionadas a parâmetros químicos e físicos de qualidade de água, medidos em 3 pontos de captação do córrego Ponte de Terra, localizado no Distrito Federal. Os parâmetros analisados, coletados mensalmente na bacia (A = 9,8 km2), foram: a cor, a turbidez, a condutividade elétrica, a concentração de amônia, a demanda química de oxigênio (DQO) e o índice de qualidade da água (IQA). Estudou-se, também, a estacionariedade das séries históricas dos parâmetros entre os anos de 1992 e 2005, quando a bacia sofreu um processo significativo de ocupação do solo. Indicadores de intensidade de ocupação do solo (LUIm) e a fragmentação da paisagem (Fp) foram desenvolvidos e calculados para a bacia, usando-se as proporções de áreas de diferentes graus de modificação e a entropia espectral da imagem, respectivamente. Apesar do uso/ocupação do solo e da fragmentação da paisagem terem aumentado significativamente no período estudado, apenas a DQO (média das 3 captações) aumentou de forma significativa. Como a zona ripária se manteve relativamente íntegra no período estudado, é possível que ela tenha amenizado eventuais impactos à qualidade da água na bacia. _______________________________________________________________________________ ABSTRACTLand-use intensity and landscape fragmentation, estimated by digital processing of remotely-sensed images, were related to chemical and physical parameters of water, measured in 3 points of the Ponte de Terra stream (9.8 km2 of basin area), located in Brasilia, Brazil. The water quality parameters studied were the colour, turbidity, conductivity, concentration of ammonia, chemical oxygen demand (COD), and the water quality index (IQA). The stationarity of the time series of the parameters was also studied in the period between 1992 and 2005, when the basin experienced a significant occupation process. Land-use intensity (LUIm) and landscape fragmentation (Fp) indicators were developed and calculated for the basin using the proportions of different use intensity classes, and the spectral entropy of the satellite images, respectively. Despite the fact that the land-use and landscape fragmentation increased significantly in the studied period, only the COD parameter (mean of the 3 points) increased significantly. As the riparian zone remained relatively undisturbed in the period, it is possible that it buffered eventual impacts on the water quality of basin

Lattice Discretization in Quantum Scattering

The utility of lattice discretization technique is demonstrated for solving nonrelativistic quantum scattering problems and specially for the treatment of ultraviolet divergences in these problems with some potentials singular at the origin in two and three space dimensions. This shows that lattice discretization technique could be a useful tool for the numerical solution of scattering problems in general. The approach is illustrated in the case of the Dirac delta function potential.Comment: 9 page

Recomendações técnicas para o cultivo de hortaliças em agricultura familiar.

bitstream/CNPH-2009/33346/1/ct_47.pd

Experimental analysis on steel reinforced glass beams at different temperatures

This work is funded by FEDER Funds, through the Operational Programme Competitiveness Factors – COMPETE, and Portuguese Funds, through FCT - Foundation for Science and Technology, under the project PTDC/ECM/116609/2010, “S-GLASS: Structural Performance and Design Rules of Glass Beams Externally Reinforced”. In addition, The COST Action TU0905 ‘‘Structural Glass – Novel Design Methods and Next Generation Products’’ is also acknowledged.Whereas glass components were used as infill elements in the past, contemporary architectural concepts include glass components as load-bearing elements. Recent architectural trends and technological developments have brought about unprecedented opportunities in the use of glass in buildings. The increasingly daring structural applications of glass will continue to drive the development of structural glass elements with high post-failure resistances. The present work aims to explore the concepts of structural performance of glass beams and the effectiveness of an embedded steel reinforcement system. The reinforcement system consists in embedding perforated stainless steel plates in the lamination process. The experimental study focuses on the effect of thermal actions and compares the use of soft foils and stiff foils (temperature ranging from approximately 16 ºC to 85 ºC).Fundação para a Ciência e a Tecnologia (FCT

An analysis of helium primordial nucleosynthesis with a variable cosmological coupling

The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to track the influence of $G$ in the primordial nucleosynthesis. To be specific, we construct a cosmological model with varying $G$, using the Brans-Dicke theory. The greater the value of $G$ at nucleosynthesis period, the greater the abundance of helium predicted. Using the observational data for the abundance of the primordial helium, constraints for the time variation of $G$ are established