Physical Sciences and Engineering

In this study, we investigated the effect of the annealing temperature on the phases and magnetic properties of iron oxide. Iron oxide nanoparticles were obtained by the thermal decomposition reaction method at different oxidation temperatures (125, 150, 200, and 250 °C). The X-ray powder diffraction data indicate the formation of three different iron oxide phases, being controlled by the annealing temperature: Fe3O4 » (Fe3O4 +α-Fe2O3) » (Fe3O4+ α-Fe2O3+β-Fe2O3).

During the months of August and September 2019, a study was conducted to evaluate the environmental impacts resulting from the disorderly expansion of the City of Godneighborhood, in the city of Manaus - AM. This study used satellite images of the PRODES project, IBGE data and environmental impact assessment method check-list. In addition, field analyses were carried out around the AdolphoDucke Forest Reserve/Amazon Museum - MUSA to identify solid waste dumped in the forest fragment area.

The prediction of the future is becoming an increasingly easy and discussed task in the literature, especially in healthcare, with predictive analyzes of medical data using the machine learning, which evolved after the development of new informed technologies that originated multiple search fields. Much dedication is fulfilled periodically to deal with an explosion of medical data, to gain knowledge of it, to predict disease, and to anticipate healing.

Objetivo: realizar revisão bibliográfica a respeito à importância do uso das redes sociais digitais na terceira idade. Método: revisão sistemática de literatura (RSL), a qual procura conhecer e analisar as contribuições culturais ou científicas do passado e presente sobre determinado assunto, tema ou problema. Para a execução da RSL foi adotado um protocolo proposto por Sampaio e Mancini (2007) que é definido em cinco etapas: Definindo a pergunta; Buscando a evidência; Revisando e selecionando os estudos; Analisando a qualidade metodológica dos estudos; e Apresentando os resultados.

This work aims to construct a computer system to aid in the early diagnosis of Chronic Kidney Disease (CKD) using noninvasive clinical data, exploring machine learning techniques. Data collection was performed at a referral center for treatment of chronic kidney disease. The database consists of 443 participants (instances), of whom 178 have no renal disease (control) and 265 have chronic kidney disease. The clinical data collected were: Gender, Age, Stature, Weight, Systolic Blood Pressure (SBP), Diastolic Blood Pressure (DBP) and Diabetes.

With the globalization and democratization of virtual networks, there has been the advancement of commercial means, citing e-commerce as an example. With all this movement and advances came a new currency, which meets the needs of today's world. The study aimed to disclose the difference in algorithms between the two main virtual currencies today: Bitcoin and Litecoin.

To handle the emissions problem and to address other issues as oil security and technology innovations, many countries have focused on renewable energy policies in combination with rapidly improving energy efficiency measures.Scholars mostly classify energy mechanism in terms of technology-push and demand pull. The literature also classifies energy policy mechanisms in terms of command-and-control and market incentive, although it doesn’t combine these mechanisms into organized categories.

This present investigation was designed to describe structure and ultra structure of ovaries of Sompat grunt Pomadasys jubelini. Sampling were done monthly in Grand-Lahou, Ebrie and Aby lagoons (Côte d’Ivoire) from January 2007 to December 2008. Histological Techniques were made using the paraffin method. Ovaries of sompat gunt are consisting of two contiguous lobes. Six stages of maturity were observed. The ovaries display a variety of colours from transparent or pink to pale yellow, orange and reddish. Ultrastructure observation showed two types of ovaries.

The present study aims at assessing the water quality index (WQI) in the surface water of Lobo river in the department of Daloa (Côte d’Ivoire). The surface water samples were subjected to comprehensive physico-chemical analysis involving major cations, anions and heavy metal.A total of sixteen physico-chemical parameters including temperature, hardness, alkalinity, dissolved oxygen, conductivity, pH, calcium, magnesium, chlorides, nitrates, sulphates and fluoride were recorded during 2012 and 2016. The study shows that water from Lobo river is acid.

In this article it is pointed out that physics has to use more than one space for describing its systems. The strong interaction needs for gluons matrices 8 dimensions. The geometry is a toroidal product from a 3- with a 5-dimensional sphere. The multiplication table is different from the octonians which serve for the spin-like triples of quasiparticles and for Gleason measurements. The weak interaction has the Heegard decays for particles which are best described by dihedrals. Gravity is best described using the Moebius transformations on a Riemannian sphere.