Topic Classification for Short Texts

In the context of TV and social media surveillance, constructing models to automate topic identification of short texts is key task. This paper formalizes the topic classification as a top-K multinomial classification problem and constructs worth-to-consider models for practical usage. We describe the full data processing pipeline, discussing about dataset selection, text preprocessing, feature extraction, model selection and learning, including hyperparameter optimization. When computing time and resources are limited, we show that a classical model like SVM performs as well as an advanced deep neural network, but with shorter model training time

A new ornithopod dinosaur, Transylvanosaurus platycephalus gen. et sp. nov. (Dinosauria: Ornithischia), from the Upper Cretaceous of the Haţeg Basin, Romania

Rhabdodontid dinosaurs were a group of medium-sized iguanodontian ornithopods from the Late Cretaceous of Europe. The uppermost Cretaceous continental deposits from the Haţeg Basin of western Romania yielded a very rich assemblage of vertebrates including abundant rhabdodontid remains, which have been exclusively referred to the genus Zalmoxes thus far. Here we describe a new rhabdodontid dinosaur, Transylvanosaurus platycephalus gen. et sp. nov., from the uppermost Cretaceous of the Haţeg Basin. The holotype of the new taxon was discovered in early–late Maastrichtian strata near Pui in the eastern part of the basin and comprises the articulated basicranium and both frontals. Transylvanosaurus differs from all previously reported rhabdodontids in having particularly wide and crested frontals, elongated and straight paroccipital processes that make only a gentle lateral curve and project mostly posterolaterally, prominent and massive prootic processes that extend mainly anterolaterally and ventrally, wide and crest-like basal tubera that meet the long axis of the braincase at a very flat angle, widely splayed basipterygoid processes that extend mainly ventrolaterally and slightly anteriorly, as well as a well-developed notch on the lateral side of the basicranium that is continuous, straight, and inclined anteroventrally. Phylogenetic analyses employing two different datasets consistently recovered the new taxon within the Rhabdodontidae, at the base of the iguanodontian radiation. Based on the morphological comparisons presented herein, we propose a particularly close relationship between Transylvanosaurus and Rhabdodon from southern France, which in turn provides evidence for a more complex biogeographic history of the Rhabdodontidae than previously thought

The use of metal alloys in the manufacture of fixed prosthetic restorations

The techniques and classical methods used to make fixed prosthetic restorations may involve recycled metal alloys from previous castings. The article presents an assessment of the procedures that dental technicians apply, the principles and criteria that are at the base of their choices and decisions when they use metal alloys in fixed prosthetic restorations. Objective. The article aims at the identification of the practices used by dental technicians in Romania when manufacturing non-noble metal alloys prosthetic suprastructures. Material and method. The data collection methodology is an attribute of both quantitative and qualitative research. Results. Over 50% of the dental laboratories are using classical methods of processing metal alloys, 82% of dental technicians use non-noble alloys (Cr-Ni, Cr-Co). 60.7% apply the recycling technique by reusing alloys and 46.4% of them are reusing the materials. Defining factors for choosing recycling process are determined on "personal appreciation based on experience in the field" and "financial-economic" criteria. Discussions. Scientific studies investigating the negative effects of recycling processes used for fixed prosthetic suprastructures emphasize on microstructural and chemical changes, consequences on the mechanical strength of the materials. They underline the strength in acidic environment, significant long-term toxic contribution in relation to the acidic environment of the oral cavity. Conclusions. The predominant use of classical laboratory methods favours the over - reuse of alloys left overs from previous melts as well as materials. The effects of these techniques are drastic and the cautious use is fundamental