7 documents found, page 1 of 1
Bi-Modal Music Emotion Recognition: Novel Lyrical Features and Dataset
Malheiro, Ricardo; Panda, Renato; Gomes, Paulo J. S.; Paiva, Rui PedroThis research addresses the role of audio and lyrics in the music emo- tion recognition. Each dimension (e.g., audio) was separately studied, as well as in a context of bimodal analysis. We perform classification by quadrant catego- ries (4 classes). Our approach is based on several audio and lyrics state-of-the-art features, as well as novel lyric features. To evaluate our approach we create a ground-truth dat...
Classification and Regression of Music Lyrics: Emotionally-Significant Features
Malheiro, Ricardo; Panda, Renato; Gomes, Paulo J. S.; Paiva, Rui PedroThis research addresses the role of lyrics in the music emotion recognition process. Our approach is based on several state of the art features complemented by novel stylistic, structural and semantic features. To evaluate our approach, we created a ground truth dataset containing 180 song lyrics, according to Russell's emotion model. We conduct four types of experiments: regression and classification by quadra...
Music Emotion Recognition from Lyrics: A Comparative Study
Malheiro, Ricardo; Panda, Renato; Gomes, Paulo J. S.; Paiva, Rui PedroWe present a study on music emotion recognition from lyrics. We start from a dataset of 764 samples (audio+lyrics) and perform feature extraction using several natural language processing techniques. Our goal is to build classifiers for the different datasets, comparing different algorithms and using feature selection. The best results (44.2% F-measure) were attained with SVMs. We also perform a bi-modal analys...
(More) About biphenyl first excited triplet state energy
Gomes, Paulo J. S.; Serpa, Carlos; Arnaut, Luís G.Biphenyl photophysics was extensively studied in the past and much attention was given to the measurement of its first excited triplet state energy. Phosphorescence and the corresponding T1 <-- S0 absorption give triplet energies that differ by 10 kcal mol-1. We revisited biphenyl photophysics using photoacoustic calorimetry (PAC), a technique that directly measures the thermochemistry and kinetics of short...
Temperature Dependence of Ultra-Exothermic Charge Recombinations13
Serpa, Carlos; Gomes, Paulo J. S.; Arnaut, Luis G.; Melo, J. Seixas de; Formosinho, Sebastião J.We measured the temperature dependence (from +32 to -50 °C) of charge-recombination rates between contact radical ion pairs in isopropyl ether. In the systems selected for this study, aromatic hydrocarbon cations are the electron acceptors and the fumaronitrile anion is the electron donor. Nearly quantitative electron transfers occur at all temperatures. The charge recombinations have excess exothermicities of ...
Electron Transfer in Supercritical Carbon Dioxide: Ultraexothermic Charge Recom...
Serpa, Carlos; Gomes, Paulo J. S.; Arnaut, Luis G.; Formosinho, Sebastião J.; Pina, João; Melo, J. Seixas deCharge-recombination rates in contact radical-ion pairs, formed between aromatic hydrocarbons and nitriles in supercritical CO2 and heptane, decrease with the exothermicity of the reactions until they reach -70 kcal mol-1, but from there on an increase is observed. The first decrease in rate is typical of the ldquoinverted regionrdquo of electron-transfer reactions. The change to an increase in the rate for ult...
1,3-Dipolar cycloaddition of azomethine ylides generated from aziridines in sup...
Gomes, Paulo J. S.; Nunes, Cláudio M.; Pais, Alberto A. C. C.; Melo, Teresa M. V. D. Pinho e; Arnaut, Luis G.The 1,3-dipolar cycloaddition of azomethine ylides with DMAD in supercritical carbon dioxide is reported. The photolysis reaction conditions were optimized with a suitable adjustment of pressure, temperature, irradiation time and co-solvent concentration leading to a more efficient reaction than in neat acetonitrile. Similar results were observed using thermal reaction conditions. Supercritical carbon dioxide w...