A Periodontite Apical (AP) representa um infeção de origem endodôntica que leva a um estado inflamatório. Inflamações crónicas, quando em nível sistémico, podem despoletar diversas doenças. ...Mediadores inflamatórios são conhecidos por levar a disfunção endotelial (ED) e por desempenhar um papel chave na iniciação e progressão da aterosclerose, a principal causa de doença coronária cardíaca (CHD). Portanto, inflamações dentárias crónicas, como a AP, poderiam fornecer um ambiente propício para eventos cardiovasculares (CVEs).Há sugestões de que AP e doenças cardiovasculares (CVDs) compartilhem patogénese e atores moleculares similares. As APs são comuns na população em geral e poderiam perpetuar a inflamação sistémica e, em troca, contribuir para o aumento da incidência de CVD. Há uma escassez de pesquisas existentes a respeito das consequências da doença endodôntica na saúde sistémica. Até o momento, poucos estudos têm investigado uma potencial correlação entre AP e CVD, e seus achados são inconclusivos.
Maciços rochosos são definidos como conjunto de blocos de rocha justapostos e articulados, limitados pelo arranjo de planos de descontinuidades (fraturas, juntas, falhas e foliações), cujas famílias ...afetam diretamente o aspecto dos maciços quanto às alternativas de métodos de lavra. A aerofotogrametria empregada no trabalho pelo uso de VANT (veículo aéreo não tripulado) foi adequada para auxiliar nas informações adquiridas com a captura das imagens aéreas e o levantamento do scan face nas bancadas norte e leste de uma pedreira para produção de agregados para a construção civil localizada na zona da mata do estado de Pernambuco. Após a criação do modelo, com o auxílio de uma ferramenta CAD e do diagnóstico das fraturas mais destacadas, com análise de estatística descritiva, projeções estereográficas pela rede de wulff; e o Diagrama de Rosetas dos planos de descontinuidades, se fez a interpretação dos blocos de partição das bancadas norte e leste do maciço estudado. O uso do vant, no trabalho, enriqueceu o tratamento dos dados levantados do scan face e propiciou a identificação dos blocos de partição, bem como outras zonas de fraqueza no maciço, que habilitam possíveis alterações na interpretação de projetos de engenharia.
When comparing topographic models generated through conventional methodology, which uses total station, with the models generated through UAV flight, aerial photogrammetry allows a larger volume of ...data that, through appropriate adjustment, provides reliable information of high precision, in addition to higher quality in the presentation of the product. The aim of this work is to compare the planimetric models produced with the purpose of verifying the progress of exploitation in multiple granite benches through the two methodologies mentioned. Hence, a survey was performed using the total station followed by the production of a model. Simultaneously, flights with different parameters were executed in order to select the Digital Surface Model (DSM) with the lowest global error, followed by the construction of another model, validated through the altimetric comparison in several points of this with the height measured in the field. Finally, it was possible to compare the two products from the theoretical width of the slopes and the one presented by the models between the foot and the projection of the crest of several points of the slopes, allowing concluding that the model generated using UAV presents greater coherence and reliability.
In fruit juice and pulp production, around 40–50% of waste generated is related to industrially processed fruit gross amount. Brazil is responsible for 57% of world market production, having the ...waste generation lost or being undervalued. Anaerobic digestion is an alternative for energetic valorization of this waste. The aim of this work is to evaluate methane generation potential of fruit waste (passion fruit peel, orange and cashew bagasse) and determine kinetic parameters for scale up. Biochemical methane potential (BMP) was evaluated in 250 mL batch reactors in mesophilic conditions for 60 days, using industrial and sewage anaerobic sludge as inocula. Kinetic parameters were determined from methane production curves, adjusting in first-order and modified Gompertz kinetic models. The best observed maximum generation potential (BMP) was 348 NmL.g−1 VS, in biogas, and 128 NmL.g−1 VS in methane, for orange bagasse with industrial sludge. Configuration methane accumulated volume presented better fit in modified Gompertz kinetic model. Fruit waste anaerobic digestion is a promising alternative for valorization and utilization of its energy potential, providing gains to productive chain.
Display omitted
•The anaerobic digestion of fruit residues was satisfactory.•he maximum potential for generation of biogas and methane was from orange with industrial sludge.•Fruit waste are better suited to the modified Gompertz model, with R2= 0.99.•The evaluated fruit residues show a high percentage of methane, it can be used for energy purposes.
Anaerobic digestion of food waste requires the addition of alkalinizer such as sodium bicarbonate (NaHCO3) which acts as a buffer in pH control, preventing accumulation of VFAs, contributing to ...increased methane production. The appropriate concentration of the alkalizer directly influences the methane generation potential of substrate. This research tested different concentrations of bicarbonate in the anaerobic digestion of food waste, using anaerobic inoculants (industrial granular sludge and flocculent sewage). Several ratios of mass percentages of NaHCO3/mass residue (%), 1.5%, 4.5%, 11%, 28%, and 111%, were tested, evaluating their effect on the methane generation potential and methane concentration in biogas in tests of biochemical potential of methane. The best methane generation potential (214 NmL CH4/g VS) and methane concentration in biogas (78%) was obtained, using 11% NaHCO3 mass/mass residue, and industrial sludge as inoculum. NaHCO3 functioned satisfactorily as a buffering agent for anaerobic digestion. The excess or the scarcity of alkalizer is harmful to anaerobic digestion, regardless of the quality of the inoculum used.
Display omitted
•NaHCO3 acts efficiently as an alkalizing and buffering agent for FW AD.•NaHCO3, 11% (m/m), provided a methane potential of 214 NmL CH4/g VS for FW AD.•NaHCO3 (11%, m/m) favored the generation of biogas with 78% methane for FW AD.•Absence or excess NaHCO3 interferes with the methane potential obtained for FW AD.
The present work estimated the accuracy of non-destructive tests in quantifying the delaminated area in CFRP samples submitted to a 4-point end notched flexure test, to evaluate the relevance of ...measuring the delamination area to calculate fracture toughness in mode II, instead of of the traditional method which evaluates the delamination length visually through the sample lateral faces. In this way, IR thermography, eddy current, ultrasonic microscopy, and X-ray computed microtomography (as reference) tests were employed. A methodological sequence based on image processing algorithms was performed to calculate the values of the delaminated areas for all NDT techniques. The first two techniques did not provide a clear separation between the defective and intact zones and are strongly influenced by edge effects. The result is different for the two last tests, which demonstrated a satisfactory definition of the delamination limit region. The ultrasonic microscopy test revealed results similar to microtomography, proving to be a promising alternative for this type of measurement. In addition, the importance of using more accurate methods in calculating the crack length is emphasized, as the traditional visual measurement can be highly susceptible to errors and does not allow evaluating potential tunneling effects or an uneven delamination front.
Display omitted
•Films on electropolished substrates have higher absorbances and are more homogeneous.•By combining absorbance and emittance, passivation results in greater solar selectivity.•SiO2 ...deposition on Mo films increased their absorbances.•The SiO2 layer increased the surface roughness of the coatings.•The SiO2 layer improved the surface homogenization of the films.
The thermal performance of solar collectors depends on the selective coverage over their absorbing plate, known as selective surfaces, which determines the heat gain and loss of the equipment. Different materials and layering arrangements can be used for the production of selective surfaces. This work proposes the production of selective surfaces of molybdenum (Mo) and silica (SiO2) evaluating the influence of the type of substrate treatment (chemical cleaning, passivation and electropolishing) on this performance. The results obtained in UV–Visible and Near Infrared Spectrophotometry showed that the surface absorptance is higher for Mo and Mo/SiO2 films on electropolished surfaces compared to treatments with acid and hexane. The highest absorptance reached was 98.10% for a Mo/SiO2 film (45.023 nm), on electropolished substrate. However, the highest solar selectivity was obtained from the Mo/SiO2 film on a passivated substrate. X-ray diffraction (XRD) exhibited peaks characteristic of the metallic Mo phase, and the presence of silica in the amorphous and crystalline phases in the form of quartz was also verified. The results obtained in Optical Profilometry and Atomic Force Microscopy (AFM) indicate that the absorptance of the samples is influenced by the roughness of the substrates.
•Is a comprehensive epidemiological survey of T. gondii infection in cattle in all Brazilian Amazon.•All the subpopulations in the state of Amazonas had herds seropositive for T. gondii.•Risk factors ...identified were number of animals for farm and presence of domestic cats.
Beef cattle farming in the Amazon region has expanded rapidly, but information on herd health is still scanty. The purpose of this study was to determine the presence of anti-Toxoplasma gondii antibodies in cattle, its spatial distribution and the risk factors associated with the infection in the state of Amazonas, Brazil. Blood samples were collected from 1073 animals on 47 farms, located in 33 municipalities in the four state subpopulations. Anti-T. gondii IgG antibodies were detected by means of the indirect fluorescent antibody test (IFAT). The overall prevalence was 30.9 % (332/1073), and seropositive animals were identified at 93.6 % farms (44/47). All the subpopulations studied in the state of Amazonas had cattle herds seropositive for T. gondii, with some areas showing higher prevalence rates. The risk factors identified in the logistic regression were number of animals (OR = 4.43) and presence of domestic cats (OR = 1.98). It is advisable to correct identified risk factors, particularly insofar as the definitive hosts of T. gondii are concerned. Attention should also focus on beef consumption, given the prevalence of T. gondii infection among cattle and the widespread clandestine slaughtering that occurs in this state.
PDF
