Federal University of São Carlos

About: Federal University of São Carlos is a education organization based out in São Carlos, Brazil. It is known for research contribution in the topics: Population & Microstructure. The organization has 16471 authors who have published 34057 publications receiving 456654 citations. The organization is also known as: UFSCar & Federal University of São Carlos.

Effect of curing time on the properties of CAC bonded refractory castables

Abstract: This work involved an investigation of the influence of the curing time on the properties of ultra-low cement high-alumina refractory castables cured at 10 °C. The hydration level of the composition was determined through thermogravimetric tests and then compared to theoretical estimations. The samples' mechanical strength and airflow permeability were strongly affected by the curing time, varying significantly in the period between 2 h and 30 days. The consequences of these changes on the drying behavior of castables are discussed.

The X1X2Y sex chromosome system in the fish Hoplias malabaricus. I. G-, C- and chromosome replication banding

Abstract: Hoplias malabaricus, a widely distributed neotropical fish (Central America to Argentina), may represent a group of distinct species showing diversified cytotypes with respect to chromosome number, morphology and sex systems. One of these karyotypic forms is characterized by an X1X1X2X2/X1X2Y sex chromosome system, with 2n = 40 and 39 chromosomes in females and males respectively. Analyses with G-, C- and chromosome replication banding permitted a better characterization of the sex chromosomes in this cytotype. The Y chromosome, unique in males, resulted from a translocation event between two biarmed chromosomes: one similar to chromosome 6 (X1) and the other one similar to chromosome 20 (X2), the latter corresponding to a probable identification. On the basis of the observed banding patterns, the Y chromosome may represent a stable dicentric, with an inactive centromere interstitially located on its long arm. The results are also related to a specific satellite DNA subfamily, previously characterized in Hoplias malabaricus, which appears to be associated with the X1 chromosome.

Using GQM and TAM to evaluate StArt - a tool that supports Systematic Review

Abstract: Background: Although Systematic Literature Review (SLR) is a reliable way of conducting literature review, its process is laborious and composed of repetitive activities. Hence, aiming to facilitate and support the conduction of such a process, the StArt tool was developed. Objective: As any new technology should be evaluated before its use, the objective of this paper is to present an overview of this tool and describe an evaluation that was carried out aiming at characterizing its usefulness and its ease of use. Method: The evaluation, applied twice, was designed through GQM paradigm and TAM model. The participants were graduate students who had a previous knowledge on SLR and have already applied the SLR process manually. Results: In both the evaluations the results were concentrated on the answers “extremely agree” or “quite agree” both for the usefulness and for the ease of use. Conclusion: Based on the results the further actions are: improvements related to the “quite agree” answers and the conduction of an experiment for evaluating the StArt in a deeper way. Despite these needed improvements, the results provide insights that StArt indeed helps the conduction of SLR and facilitates the application of its process.

Hydrogen production through oxidative steam reforming of ethanol over Ni-based catalysts derived from La1−xCexNiO3 perovskite-type oxides

Abstract: This paper investigates the effect of lanthanum substitution by cerium oxide on the performance of La 1− x Ce x NiO 3 ( x = 0, 0.05, 0.1, 0.4, 0.7 and 1.0) perovskite-type oxide precursor for the oxidative steam reforming of ethanol. All catalysts are active and selective to hydrogen but carbon deposition occurs except for La 0.90 Ce 0.10 NiO 3 . Increasing the Ce content decreases the amount of carbon deposited, which passes through a minimum at around 10 wt% of Ce and then increases. The higher resistance to carbon formation on La 0.90 Ce 0.10 NiO 3 catalyst is due to the smaller Ni crystallite size. Furthermore, the support also plays an important role on catalyst stability during ethanol conversion reaction. The reduced La 0.9 Ce 0.1 NiO 3 sample exhibits the highest amount of oxygen vacancies, which decreases as ceria content increases. This highly mobile oxygen reacts with carbon species as soon as it forms, and thus keeps the metal surface free of carbon, inhibiting deactivation.