Study of the kinetics of martensitic transformation in the USISAR 80T microalloyed steel.

No presente trabalho, estudou-se a aplica??o de modelos cin?ticosde transforma??o martens?ticadispon?veis na literatura t?cnica a fim de modelar curvas de fra??o da fase austenita transformada em martensita para o a?o USISAR 80T, estrutural, microligado, de boa temperabilidade e considerado de boa soldabilidade. Ensaios dilatom?tricos foram realizados com taxa de aquecimento de 3?C/s at? a temperatura de austenitiza??o de 920?C, tempo de encharque de 180 segundos e taxas de resfriamento de 25?C/s, 50?C/s, 75?C/s e 100?C/s. Um dos modelos estudados apresentou boa correla??o com os dados experimentais para todas as taxas de resfriamento estudadas, sendo poss?vel ent?o a obten??o de constantes caracter?sticas da transforma??o estudada e a proposi??o de um modelo de previsibilidade para o a?o USISAR 80T.In this work, martensitic kinetic models, available in the technical literature, were studied aiming to model and to predict the austenite to martensite transformation for the USISAR 80T steel, which is a structural, microalloyed, with high hardenability and considered a great weldable steel. Dilatometrictests were performed with a heating rate of 3?C/s until 920?C, with a soaking time of 180 seconds and cooling rates of 25?C/s, 50?C/s, 75?C/s and 100?C/s.One of the studied models showed good agreement with the experimental data for all the employed cooling rates, and it was possible to determinetransformation characteristic constants and suggest a previsibility model for the USISAR 80T steel

Bentonites Modified with Phosphomolybdic Heteropolyacid (HPMo) for Biowaste to Biofuel Production

Two bentonites from Paraíba (Northeastern Brazil) were impregnated with heteropoly phosphomolybdic H3PMo12O40 (HPMo). The materials produced were characterized by various techniques such as N2 adsorption-desorption (specific surface area, SSA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA/DTG), Scanning Electron Microscopy (SEM) equipped with Dispersive Energy X-ray spectroscopy (EDS), ultraviolet-visible spectroscopy (UV-vis), acid-base titration analysis. The catalytic activity of these materials was tested in the esterification of a waste from palm oil deodorization and the main results obtained (about 93.3% of conversion) indicated that these materials have potential to act as heterogeneous solid acid catalysts. The prepared materials exhibited satisfactory catalytic performance even after a very simple recycling process in three reuse cycles, without significant loss of their activities

Association between dietary patterns and renal function in a cross-sectional study using baseline data from the ELSA-Brasil cohort

Previous analyses of the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil) identified four main dietary patterns (DP). The aim of this study was to explore the association between the previously defined DP and renal function (RF). A crosssectional study using the ELSA-Brasil baseline data was carried out. DP (‘‘traditional’’, ‘‘fruits and vegetables’’, ‘‘bakery’’, and ‘‘low sugar/low fat), metabolic syndrome (MS) using the Joint Interim Statement criteria, microalbuminuria (MA), and glomerular filtration rate (eGFR) through the CKD-EPI equation were evaluated. Abnormal RF was defined as eGFRo60 mL min–1 (1.73 m2 ) –1 and MAX3.0 mg/dL. Factors associated with RF were determined and mediation analysis was performed to investigate the association between DP, MS, and RF. A total of 15,105 participants were recruited, with a mean age of 52±9 years; 8,134 participants (54%) were females. The mediation analysis identified indirect associations between ‘‘bakery’’ and ‘‘fruits and vegetables’’, and both were associated with decreased eGFR and albuminuria in both genders, compared with ‘‘traditional’’ and ‘‘low sugar/low fat’’ patterns in the general population. There was a direct association of the ‘‘bakery’’ pattern with MA in men (OR: 1.17, 95%CI: 1.92–1.48). The ‘‘fruits and vegetables’’ pattern also showed a direct association with reduced eGFR in women (OR: 1.65, 95%CI: 1.28–2.12), although there was no significance after adjustment. The ‘‘fruits and vegetables’’ and ‘‘bakery’’ DPs were associated with renal dysfunction. The only independent, direct association was between ‘‘bakery’’ DP and MA in men, raising concerns about DP and renal damage in men

Ichthyofauna Used in Traditional Medicine in Brazil

Fish represent the group of vertebrates with the largest number of species and the largest geographic distribution; they are also used in different ways by modern civilizations. The goal of this study was to compile the current knowledge on the use of ichthyofauna in zootherapeutic practices in Brazil, including ecological and conservational commentary on the species recorded. We recorded a total of 85 species (44 fresh-water species and 41 salt-water species) used for medicinal purposes in Brazil. The three most commonly cited species were Hoplias malabaricus, Hippocampus reidi, and Electrophorus electricus. In terms of conservation status, 65% of species are in the “not evaluated” category, and 14% are in the “insufficient data” category. Three species are in the “vulnerable” category: Atlantoraja cyclophora, Balistes vetula, and Hippocampus erectus. Currently, we cannot avoid considering human pressure on the population dynamics of these species, which is an essential variable for the conservation of the species and the ecosystems in which they live and for the perpetuation of traditional medical practices

A concepção hegemônica de trabalho e sua influência na formação do pensamento pedagógico nacional e na organização do sistema educacional

A presente investigação visa estudar o modo como a concepção hegemônica de trabalho influenciou a formação do pensamento pedagógico nacional e a organização do sistema educacional. O estudo se fará a partir da República Velha. O surgimento de mercados urbanos no final do século XIX e início do século XX permitiu o aparecimento de pequenas indústrias que, em­bora desempenhando papel secundário na economia do país, onde pre­dominava a estrutura tradicional agrário-exportadora, representou certo avanço rumo à industrialização. O processo de industrialização se consoli­dou mais tarde com a Revolução de 1930, da qual surge uma “nova” ori­entação, tanto no plano teórico quanto prático, em que a educação assume um papel utilitarista, voltado aos interesses socioeconômicos do Estado Novo, implantado em 1937

Scientific production on workplace bullying/harassment in dissertations and theses in the Brazilian scenario

OBJECTIVE To analyze scientific production about workplace bullying and harassment in dissertations and theses in Brazil, with emphasis on the year of publication; educational institution; area of knowledge; professional and academic background of the authors; keywords used; and concept map organization. METHOD Bibliometric study with a quantitative approach with a sample consisting of 57 papers, 5 theses and 52 dissertations, published between 2002 and 2012. RESULTS It was found that 2012 was the year with the highest number of publications in this topic area. The region that stood out was the Southeast. The institution with the highest number of publications was the Federal University of Santa Catarina. There was a predominance of dissertations and most publications were produced by researchers focused on a multidisciplinary perspective. CONCLUSION Expanding the views regarding bullying in order to disseminate scientific production was proposed, promoting further advancement of debates and raising pertinent questions

Arterial hypertension and associated factors in patients submitted to myocardial revascularization

OBJECTIVE To identify the prevalence of arterial hypertension and associated factors in patients submitted to myocardial revascularization. METHOD Cross-sectional study using the database of a hospital in São Paulo (SP, Brazil) containing 3010 patients with coronary artery disease submitted to myocardial revascularization. A multiple logistic regression was performed to identify variables independently associated with hypertension (statistical significance: p1.3: (OR=1.37;CI:1.09-1.72). CONCLUSION A high prevalence of arterial hypertension and association with both non-modifiable and modifiable factors was observed

A multicentric evaluation of the recombinant Leishmania infantum antigen-based immunochromatographic assay for the serodiagnosis of canine visceral leishmaniasis.

Background: Visceral leishmaniasis (VL) is a serious public health challenge in Brazil and dogs are considered to be the main urban reservoir of the causative agent. The culling of animals to control VL in some countries makes the accurate diagnosis of canine VL (CVL) essential. Recombinant antigens rLci1A and rLci2B were selected from a cDNA library of Leishmania infantum amastigotes due to their strong potential as candidates in diagnostic testing for CVL. The present multicentric study aimed to evaluate the sensitivity of a prototype test using these antigens (DPPrLci1A/rLci2B) against 154 sera obtained from symptomatic dogs within three endemic areas of VL in Brazil. The specificity was evaluated using 40 serum samples from negative dogs and dogs infected with other pathogens. Sensitivity and specificity rates of DPP rLci1A/rLci2B prototype were compared to rates from other diagnostic tests currently in use by the Brazilian Ministry of Health, including DPP?LVC, EIE?LVC. Findings: DPP rLci1A/rLci2B prototype offered similar performance to that offered by DPP?LVC rapid test, as follows: sensitivity of 87% (CI 81?91) and 88% (CI 82?93) and specificity of 100% (CI 91?100) and 97% (CI 87?100), respectively for DPP rLci1A/rLci2B and DPP?LVC. When results of these two tests were considered concomitantly, sensitivity increased to 93.5% (CI 89?96). Conclusions: The recombinant antigens rLci1A and rLci2B represent promising candidates for use in a multi-antigen rapid test for CVL. The inclusion of novel antigens to the DPP rLci1A/rLci2B prototype model could offer additionally enhanced sensitivity to detect animals infected by L. infantum