Este artigo apresenta os resultados obtidos da exploração dos vetores de características gerados de técnicas de word embedding (especificamente word2vec e wang2vec) a partir de um banco de textos na ordem do bilhão de tokens em comparação com os gerados a partir de bancos pequenos na ordem de dezenas de milhar, na aplicação de detecção de discurso de ódio na língua portuguesa. Dando continuidade às pesquisas desenvolvidas por outros autores no Brasil e em Portugal, e aproveitando os recursos e sugestões por eles disponibilizados, conseguiu-se uma melhora de até 2,5% na taxa de acerto na classificação, em relação ao estado da arte em língua portuguesa.
<p>The thermo-energetic performance of the building is closely related to its climate and, therefore, the effects of climate change can influence the environmental comfort of dwellings over the years. This research aimed to investigate the thermal performance of single-family houses built in different building systems under the influence of the climate change effects on the climate in São Paulo. For this purpose, simulations with EnergyPlus were performed considering four climatic periods: TRY (1954), 2020, 2050 and 2080. The future climate files were generated with the assistance of the CCWorldWeatherGen tool, and the progression generated for the 2020 period was compared with meteorological data measured from 2011 to 2018. The results showed that outdoor air temperature of São Paulo will increase on average of 4.23 °C up to 2100, which will cause the degree-hours for heating (GHA) indicator to decrease to 1.165,24 °Ch and the degree-hours for cooling (GHR) indicator to increase to 144,26 °Ch, according to the constructive system. Furthermore, it was observed that building façades with higher thermal capacity will be important to satisfy the user’s thermal comfort requirements. Therefore, it is necessary to consider climate change in energy efficiency solutions in buildings.</p>
The development of the civil construction industry generates major problems, such as the production of construction waste. This complication is aggravated mainly in municipalities where there is no management and disposal policy, as it is the case of Sinop, Mato Grosso (MT), Brazil. A possible solution to this environmental problem in that municipality is the application of ground waste to sand fraction as stabilizer in order to increase resistance of the regional subgrade. The latter is characterized as having a low-bearing soil capacity. Furthermore, this strategy may allow for soothing of other problems, such as granular material extraction from the environment. This paper sought answers to improve the low-bearing soil capacity in Sinop, which was granulometrically and mechanically stabilized by having natural soil mixed with two percentages of construction waste: 25% and 50%, with two compaction energies: normal and intermediate. Samples were subjected to tests for characterization and resistence. Results show relevant improvement in handling material characteristics. Natural soil, characterized as A-4 TRB, from bad to poor subgrade performance, and 12.2% CBR, with blend in three CBR cases as well as expansion, conformed to be sub-base material (CBR > 20%). Additionally, in one of the cases, it conformed to be base material (CBR > 60%). However, even though material with good resistance and bearing capacity was obtained, it was not possible to reach conclusions on its technical feasibility due to grain size not fitting ABNT NBR 15115 specification.
The combination of hot weather typical factors, such as high temperature and low relative humidity of the air, associated with the delay in concrete application due to lack of planning in concreting, are some causes of slump loss in this material. Depending on the type of work and the adopted execution methods, this loss may make both placement and compaction more difficult. Thus, consistency correction through water addition or other plasticizer additives are common. In this context, this research aimed to analyze the variations of slump loss in concrete through time and the consequences of water addition in the mixture. Therefore, it was performed a study with trace of characteristic resistance to compression correspondent to 35 MPa, analyzing 70 test specimens in a total of seven subsequent periods, from 0 min (after preparation) and 180 min. The specimens were molded according to ABNT NBR 5738 (2015) Brazilian standard and submitted to compression test after 28 days being cured, according to ABNT NBR 5739 (2018) Brazilian standard. Results showed that after 180 min, water addition caused a 68,60% increase in water to cement ratio and a 59,20% loss of resistance to compression. In summary, water addition to slump correction was observed to be an extremely harmful practice to concrete and it should be avoided or minimized.
O sistema construtivo cross-laminated timber (CLT) vem sendo aplicado com sucesso em edificações do mundo todo, e se apresenta como uma tecnologia promissora no Brasil. O objetivo desta pesquisa foi investigar o desempenho termoenergético de painéis CLT, de medula de eucalipto, para vedações verticais de edificações multifamiliares, considerando os climas de Brasília e Santa Maria. Para tanto, aplicou-se o método de simulação do Regulamento Técnico para o Nível de Eficiência Energética de Edificações Residenciais (RTQR). Os resultados de 12 combinações paramétricas simplificadas indicaram que o sistema construtivo inovador apresenta grande potencial de melhoria termoenergética em edificações multifamiliares sob os climas avaliados. Dentre as composições consideradas, os painéis CLT de 5 camadas associados à baixa absortância solar na envoltória caracterizaram a melhor configuração para se alcançar nível A de eficiência. Conclui-se que a tecnologia é adequada para as situações analisadas, sendo necessárias revisões nas normas brasileiras que limitam a difusão e avanço de sistemas leves e inovadores como o CLT.
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