Utilization of Multinomial Naive Bayes Algorithm and Term Frequency Inverse Document Frequency (TF-IDF Vectorizer) in Checking the Credibility of News Tweet in the Philippines

The digitalization of news media become a good indicator of progress and signal to more threats. Media disinformation or fake news is one of these threats, and it is necessary to take any action in fighting disinformation. This paper utilizes ground truth-based annotations and TF-IDF as feature extraction for the news articles which is then used as a training data set for Multinomial Naive Bayes. The model has an accuracy of 99.46% in training and 88.98% in predicting unseen data. Tagging fake news as real news is a concerning point on the prediction that is indicated in the F1 score of 89.68%. This could lead to a negative impact. To prevent this to happen it is suggested to further improve the corpus collection, and use an ensemble machine learning to reinforce the predictio

Determination of step--edge barriers to interlayer transport from surface morphology during the initial stages of homoepitaxial growth

We use analytic formulae obtained from a simple model of crystal growth by molecular--beam epitaxy to determine step--edge barriers to interlayer transport. The method is based on information about the surface morphology at the onset of nucleation on top of first--layer islands in the submonolayer coverage regime of homoepitaxial growth. The formulae are tested using kinetic Monte Carlo simulations of a solid--on--solid model and applied to estimate step--edge barriers from scanning--tunneling microscopy data on initial stages of Fe(001), Pt(111), and Ag(111) homoepitaxy.Comment: 4 pages, a Postscript file, uuencoded and compressed. Physical Review B, Rapid Communications, in press

Exploring the Viability of Augmented Reality as a Supplementary Material for Learning Cell Biology and Photosynthesis for Grade 12 Students

Augmented reality (AR) is one of the many emerging digital technologies that specializes in gaming, medicine, entertainment, and education. AR-assisted technologies have undergone studies and were claimed to provide a better learning experience for students and lecturers who integrate its features in modern-day classrooms. An example is Google Expeditions, a cost-effective and accessible alternative; however, further research may be needed on such applications, especially when used solely as a supplement. This study assesses AR\u27s effects on Grade 12 students\u27 academic performance and motivation when used as a supplemental learning material for cell biology and photosynthesis. Assessment scores between those who used augmented reality and those who did not reveal a greater improvement in academic performance of the former group. Furthermore, students reported through the Instructional Materials Motivation Survey (IMMS) that they were motivated by the AR tours used during the experiment. These findings point to the potential benefit of integrating AR-based supplementary materials to promote student learning and motivation

Biomassa radicular em pastagens nativas do Pantanal.

O objetivo deste trabalho foi avaliar a biomassa radicular de pastagens nativas em diferentes estados de conservação. As pastagens foram classificadas em três estados de conservação em função da cobertura de plantas forrageiras: bom, moderado e degradado

Produção e qualidade das sementes dos acessos da grama-do-cerrado mantidas em banco ativo de germoplasma.

A grama-do-cerrado (Mesosetum chasea) é uma das espécies de forrageiras conservadas no Banco Ativo de Germoplasma (BAG) da Embrapa Pantanal. A escolha desta espécie se deve ao seu potencial de produção em áreas arenosas e pobres do Pantanal, porém, uma das limitações é a sua disseminação por meios de sementes, o que ainda requer diversos estudos básicos. O número de perfilhos reprodutivos (PR) por área é um dos principais determinantes da produção de sementes de plantas forrageiras, assim como a qualidade das sementes. O objetivo deste estudo foi avaliar o número de perfilhos reprodutivos sadios e não sadios, assim como o peso das sementes produzidas em diferentes acessos mantidos no BAG

Simulations of energetic beam deposition: from picoseconds to seconds

We present a new method for simulating crystal growth by energetic beam deposition. The method combines a Kinetic Monte-Carlo simulation for the thermal surface diffusion with a small scale molecular dynamics simulation of every single deposition event. We have implemented the method using the effective medium theory as a model potential for the atomic interactions, and present simulations for Ag/Ag(111) and Pt/Pt(111) for incoming energies up to 35 eV. The method is capable of following the growth of several monolayers at realistic growth rates of 1 monolayer per second, correctly accounting for both energy-induced atomic mobility and thermal surface diffusion. We find that the energy influences island and step densities and can induce layer-by-layer growth. We find an optimal energy for layer-by-layer growth (25 eV for Ag), which correlates with where the net impact-induced downward interlayer transport is at a maximum. A high step density is needed for energy induced layer-by-layer growth, hence the effect dies away at increased temperatures, where thermal surface diffusion reduces the step density. As part of the development of the method, we present molecular dynamics simulations of single atom-surface collisions on flat parts of the surface and near straight steps, we identify microscopic mechanisms by which the energy influences the growth, and we discuss the nature of the energy-induced atomic mobility

Adatom diffusion on vicinal surfaces with permeable steps

We study the behavior of single atoms on an infinite vicinal surface assuming certain degree of step permeability. Assuming complete lack of re-evaporation an ruling out nucleation the atoms will inevitably join kink sites at the steps but can do many attempts before that. Increasing the probability of step permeability or the kink spacing lead to increase of the number of steps crossed before incorporation of the atoms into kink sites. The asymmetry of the attachment-detachment kinetics (Ehrlich-Schwoebel effect) suppresses the step permeability and completely eliminates it in the extreme case of infinite Ehrlich-Schwoebel barrier. The average number of permeability events per atom scales with the average kink spacing. A negligibly small drift of the adatoms in a direction perpendicular to the steps leads to a significant asymmetry of the distribution of the permeability events the atoms thus visiting more distant steps in the direction of the drift.Comment: 12 pages, 6 figure

Self-diffusion along step bottoms on Pt(111)

First-principles total energies of periodic vicinals are used to estimate barriers for Pt-adatom diffusion along straight and kinked steps on Pt(111), and around a corner where straight steps intersect. In all cases studied, hopping diffusion has a lower barrier than concerted substitution. In conflict with simulations of dendritic Pt island formation on Pt(111), hopping from a corner site to a step whose riser is a (111)-micro facet is predicted to be more facile than to one whose riser is a (100)