Florianopolis, Brazil

Federal University of Santa Catarina

Florianopolis, Brazil

The Federal University of Santa Catarina is a public university in Florianópolis, the capital city of Santa Catarina in southern Brazil. Ranked as the 4th best overall university in Latin America by the Webometrics Ranking of World Universities, it is one of the leading Latin American research universities, being the third largest university in Brazil and the fifth in Latin America, noted for its engineering school, and the only Federal University in the state of Santa Catarina. UFSC is internationally known for the quality of its courses in mechanical engineering, control engineering, sanitary engineering, electrical engineering and dentistry.The organization of its campus is done in the 11 Centers of Education , divided by field of study. Every Center of Education is divided in departments, the largest one being Department of Mechanical Engineering. The oldest is the Center of Juridic science, that is itself the department of Law, which was the first of UFSC's departments to be officially recognized in 1932. Wikipedia.

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The present invention relates to a process for the synthesis of nanostructured metallic hollow spherical particles, in which the metal is deposited onto sacrificial masks formed in a polymeric colloidal solution by the electroless autocatalytic deposition method (deposition by the present process releases only gaseous products (N2 and H2)) during the oxidation thereof, which evolve without leaving contaminants in the deposit)). The particulate material composed by nanostructured metallic hollow spherical particles with average diameter ranging from 100 nm to 5 m and low density with respect to the massic metal, and a process for compacting and sintering a green test specimen formed by the respective particulate material are also described. 1

MacHado V.G.,Federal University of Santa Catarina | Stock R.I.,Federal University of Santa Catarina | Reichardt C.,University of Marburg
Chemical Reviews | Year: 2014

A study is conducted to review the syntheses, physicochemical properties, and applications of pyridinium N-phenolate betaine dyes. The investigations are concerned with the synthesis of the pyridinium N-phenolates and related compounds. The importance of the use of standard betaine 1 and other secondary betaines for studies involving the empirical determination of solvent polarities is described. The thermo-solvatochromism, halochromism, and piezochromism of these compounds are reviewed, along with their behavior as probes in the investigation of solvent mixtures. The historical context related to the concept of solvent polarity and the use of solvatochromic compounds, including the pyridinium N-phenolates, for the investigation of the polarity of solvents, is presented.

Whirlpool Corp., Federal University of Santa Catarina and Lupatech SA | Date: 2015-12-04

The metallurgical composition comprises a main particulate metallic material, for example iron or nickel, and at least one alloy element for hardening the main metallic material, which form a structural matrix; a particulate solid lubricant, such as graphite, hexagonal boron nitride or mixture thereof; and a particulate alloy element which is capable of forming, during the sintering of the composition conformed by compaction or by injection molding, a liquid phase, agglomerating the solid lubricant in discrete particles. The composition may comprise an alloy component to stabilize the alpha-iron matrix phase, during the sintering, in order to prevent the graphite solid lubricant from being solubilized in the iron. The invention further refers to the process for obtaining a self-lubricating sintered product.

Queiroz L.P.,Federal University of Santa Catarina
Current Pain and Headache Reports | Year: 2013

Studying the epidemiology of fibromyalgia (FM) is very important to understand the impact of this disorder on persons, families and society. The recent modified 2010 classification criteria of the American College of Rheumatology (ACR), without the need of tender points palpation, allows that larger and nationwide surveys may be done, worldwide. This article reviews the prevalence and incidence studies done in the general population, in several countries/continents, the prevalence of FM in special groups/settings, the association of FM with some sociodemographic characteristics of the population, and the comorbidity of FM with others disorders, especially with headaches. © 2013 Springer Science+Business Media New York.

Castro L.B.,Federal University of Santa Catarina
Physical Review C - Nuclear Physics | Year: 2012

We address the behavior of the Dirac equation with scalar (S), vector (V), and tensor (U) interactions under the γ5 discrete chiral transformation. By using this transformation, in a simple way, we can obtain solutions for the Dirac equation with spin (Δ=VS=0) and pseudospin (Σ=V+S=0) symmetries, which includes a tensor interaction. As an application, the Dirac equation with scalar, vector, and tensor Cornell radial potentials is considered, and the correct solution to this problem is obtained. © 2012 American Physical Society.

Germana C.,Federal University of Santa Catarina
Monthly Notices of the Royal Astronomical Society: Letters | Year: 2013

Twin-peak high-frequency quasi-periodic oscillations (HF QPOs) observed in the power spectra of low-mass X-ray binaries, with either a black hole or a neutron star, have central frequencies that are typical of the orbital motion time-scale close to the compact object. Thus, twin HF QPOs might carry the fingerprint of physical effects in a strongly curved space-time. We study the azimuth phase φ(t) for orbital motion in the Schwarzschild metric and calculate the power spectra to check whether they display the features seen in the observed ones. We show that the timing of φ(t) on non-closed orbits can account for the observed twin-peak HF QPOs. The uppermost couple of peaks in frequency has the lower peak that corresponds to the azimuthal frequency νφ, the upper one to νφ + νr. The azimuth phase temporal behaviour φ(t) on a slightly eccentric orbit in the Schwarzschild metric is described by a linear function of slope νφplus an oscillating term at the relativistic radial frequency νr. We deduce that the twin-peak HF QPOs might originate from a frequency modulated signal driven by the kinematics of orbital motion in a curved space-time. © 2012 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society.

Andrade E.L.,Federal University of Santa Catarina
American journal of physiology. Renal physiology | Year: 2011

The ankyrin-repeat transient receptor potential 1 (TRPA1) has been implicated in pathological conditions of the bladder, but its role in overactive bladder (OAB) following spinal cord injury (SCI) remains unknown. In this study, using a rat SCI model, we assessed the relevance of TRPA1 in OAB induced by SCI. SCI resulted in tissue damage, inflammation, and changes in bladder contractility and in voiding behavior. Moreover, SCI caused upregulation of TRPA1 protein and mRNA levels, in bladder and in dorsal root ganglion (DRG; L6-S1), but not in corresponding segment of spinal cord. Alteration in bladder contractility following SCI was evidenced by enhancement in cinnamaldehyde-, capsaicin-, or carbachol-induced bladder contraction as well as in its spontaneous phasic activity. Of relevance to voiding behavior, SCI induced increase in the number of nonvoiding contractions (NVCs), an important parameter associated with the OAB etiology, besides alterations in other urodynamic parameters. HC-030031 (TRPA1 antagonist) treatment decreased the number and the amplitude of NVCs while the TRPA1 antisense oligodeoxynucleotide (AS-ODN) treatment normalized the spontaneous phasic activity, decreased the cinnamaldehyde-induced bladder contraction and the number of NVCs in SCI rats. In addition, the cinnamaldehyde-induced bladder contraction was reduced by exposure of the bladder preparations to HC-030031. The efficacy of TRPA1 AS-ODN treatment was confirmed by means of the reduction of TRPA1 expression in the DRG, in the corresponding segment of the spinal cord and in the bladder, specifically in detrusor muscle. The present data show that the TRPA1 activation and upregulation seem to exert an important role in OAB following SCI.

Whirlpool Corp. and Federal University of Santa Catarina | Date: 2014-07-15

The plasma reactor comprises a reaction chamber (23) connectable to a source of ionizable gases (25) and to a heating device (80), said reactor (10) being subjected to the phases of heating (A), cleaning (L) and/or surface treatment (S), cooling (R), unloading (D) and loading (C) of metallic pieces (1). The installation comprises: at least two reactors (10), each being selectively and alternately connected to: the same source of ionizable gases (25); the same vacuum source (60); the same electrical energy source (50); and to the same heating device (80), the latter being displaceable between operative positions, in each of which surrounding laterally and superiorly a respective reactor (10), while the latter is in its heating phase (A) and cleaning phase (L) and/or in the surface treatment phase (S) of the metallic pieces (1).

The present invention relates to acyl-hydrazone compounds, in particular 3,4,5-trimethoxyphenyl-hydrazide derivatives, as well as the oxadiazole analogs thereof and other similar compounds, and to the pharmaceutical use of the same for the treatment of various diseases associated with cell proliferation, such as leukemias, including acute lymphoblastic leukemia (ALL), tumours and inflammation. Acyl-hydrazones have been obtained having activity similar to that of the compound used as a standard in experiments (colchicine). The greater selectivity of the compounds according to the invention is an important feature, associated with fewer side effects than the pharmaceuticals used at present in clinical treatments. The synthetised acyl-hydrazones, more particularly the compounds 02 and 07, exhibited important anti-leukemic activity, which suggests 02 and 07 as candidates to pharmaceutical prototypes, or to pharmaceuticals for the treatment of leukemias, in particular acute lymphoblastic leukemia (ALL), tumours and other proliferative diseases, such as inflammation. The action mechanism of the most active compounds was determined by using DNA microarrays and subsequent tests indicated by the chip, besides selectivity studies in healthy human lymphocytes.

A process for the synthesis of nanostructured metallic hollow spherical particles, in which the metal is deposited onto sacrificial masks formed in a polymeric colloidal solution by the electroless autocatalytic deposition method. Deposition releases only gaseous products (N_(2 )and H_(2)) during the oxidation thereof, which evolve without leaving contaminants in the deposit. The particulate material includes nanostructured metallic hollow spherical particles with average diameter ranging from 100 nm to 5 m and low density with respect to the massic metal. A process for compacting and sintering a green test specimen are also described.

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