University of the Littoral Opal Coast

About: University of the Littoral Opal Coast is a education organization based out in Dunkirk, France. It is known for research contribution in the topics: Catalysis & Dielectric. The organization has 1242 authors who have published 2383 publications receiving 46230 citations. The organization is also known as: ULCO.

A multimodal deep learning approach for named entity recognition from social media.

Abstract: Named Entity Recognition (NER) from social media posts is a challenging task. User generated content that forms the nature of social media, is noisy and contains grammatical and linguistic errors. This noisy content makes it much harder for tasks such as named entity recognition. We propose two novel deep learning approaches utilizing multimodal deep learning and Transformers. Both of our approaches use image features from short social media posts to provide better results on the NER task. On the first approach, we extract image features using InceptionV3 and use fusion to combine textual and image features. This presents more reliable name entity recognition when the images related to the entities are provided by the user. On the second approach, we use image features combined with text and feed it into a BERT like Transformer. The experimental results, namely, the precision, recall and F1 score metrics show the superiority of our work compared to other state-of-the-art NER solutions.

Nanocrystalline LaCoO3 modified by Ag nanoparticles with improved sensitivity to H2S

Abstract: Semiconductor mixed-metal oxides with perovskite structure are of increasing interest for the application in chemical sensors. LaCoO3 has been extensively studied for its peculiar electronic and magnetic properties, but less is known of the gas sensing mechanisms of this material and its composites. In this work, nanocrystalline LaCoO3 was synthesized by sol-gel method and functionalized by Ag nanoparticles. An improved sensitivity to H2S was observed for Ag/LaCoO3 sensors, in contrast to pure LaCoO3 sensor. The Ag/LaCoO3 sensors had minimum cross-sensitivity to CO and NH3 interfering gases, which were present at higher concentrations than H2S. The role of Ag nanoparticles in the selective sensitivity of Ag/LaCoO3 nanocomposites to H2S gas were unveiled using in situ infrared (DRIFT) spectroscopy.

No feeding on Phaeocystis sp. as solitary cells (post-bloom period) by the copepod Temora longicornis in the coastal waters of the English Channel

Abstract: A Phaeocystis sp. (Prymnesiophyceae) bloom regularly occurs in April–May in the Eastern English Channel. In the literature, views are divided about the in situ appetence of copepods for this alga. In a study carried out in the coastal waters off the bay of Somme, at the end of the bloom, from 29 of April to 1 of May 1996, HPLC pigment analysis on both gut algal pigments and algal pigments from the water column shows that Temora longicornis adults did not feed on single cells of Phaeocystis sp. Alternatively, T. longicornis ingested diatoms and the gut content was correlated with the diatom biomass in the water. More, T. longicornis fed selectively on Dinophyceae and Cryptophyceae, which were scarcely present in the food environment. An inverse relationship was found between the concentration of Phaeocystis sp. in seawater and both gut content and abundance of young stages (CI–CIII copepodites) of T. longicornis. These results suggest an unfavourable impact of Phaeocystis sp. post-bloom on both feeding activity and distribution of T. longicornis.