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Search Results: 1 - 10 of 676644 matches for " M. C. M. de Souza;Faria "
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Welding current effect on diffusible hydrogen content in flux cored arc weld metal
Bracarense A. Q.,Souza R. Lacerda de,Costa M. C. M. de Souza,Faria P. E.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: The application of flux cored arc welding (FCAW) has increased in manufacturing and fabrication. Even though FCAW is well known for its good capability in producing quality welds, few reports have been published on the cause of the relatively high diffusible hydrogen content in the weld metal and its relation with the ingredients used in the wire production and with the welding parameters (mainly welding current). This paper describes experiments where data obtained from weld metal diffusible hydrogen analysis, metal droplet collection, and high-speed recording of metal droplet transfer were used to evaluate the effect of welding current on diffusible hydrogen content in the weld metal. The results from gas chromatography analysis showed that weld metal hydrogen content indeed increased with welding current. A polynomial regressional analysis concluded that hydrogen increase with current was better described by a linear function with proportional constant of approximately 0.7 or 70%. Different from the GMA welding transfer behavior, statistical analysis showed only a small increase in metal droplet size with increasing current. The metal transfer mode remained in the globular range for currents between 100 and 150 A. The most surprising findings were with the high-speed cinematography recording. Observing the high speed movies, it was possible to see that at low current, "unmelted" flux sporadically touched the weld pool but at higher current, the flux remained touching the weld pool during the whole time of droplet formation and transfer. It is believed that since the flux has ingredients that contain hydrogen, hydrogen passes through the arc undisturbed, going to the weld bead intact and increasing the hydrogen content in the weld metal. Another important observation is regarding to droplet size. Droplet size increased with increasing current because forces from decomposed gases from the flux could sustain the droplets, retarding their transfer and allowing them to grow.
Quantifying the decay of quantum properties in single-mode states
L. A. M. Souza,M. C. Nemes,M. Fran?a Santos,J. G. Peixoto de Faria
Physics , 2007, DOI: 10.1016/j.optcom.2008.06.017
Abstract: The dissipative dynamics of Gaussian squeezed states (GSS) and coherent superposition states (CSS) are analytically obtained and compared. Time scales for sustaining different quantum properties such as squeezing, negativity of the Wigner function or photon number distribution are calculated. Some of these characteristic times also depend on initial conditions. For example, in the particular case of squeezing, we find that while the squeezing of CSS is only visible for small enough values of the field intensity, in GSS it is independent of this quantity, which may be experimentally advantageous. The asymptotic dynamics however is quite similar as revealed by the time evolution of the fidelity between states of the two classes.
Welding current effect on diffusible hydrogen content in flux cored arc weld metal
Bracarense, A. Q.;Souza, R. Lacerda de;Costa, M. C. M. de Souza;Faria, P. E.;Liu, S.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000400005
Abstract: the application of flux cored arc welding (fcaw) has increased in manufacturing and fabrication. even though fcaw is well known for its good capability in producing quality welds, few reports have been published on the cause of the relatively high diffusible hydrogen content in the weld metal and its relation with the ingredients used in the wire production and with the welding parameters (mainly welding current). this paper describes experiments where data obtained from weld metal diffusible hydrogen analysis, metal droplet collection, and high-speed recording of metal droplet transfer were used to evaluate the effect of welding current on diffusible hydrogen content in the weld metal. the results from gas chromatography analysis showed that weld metal hydrogen content indeed increased with welding current. a polynomial regressional analysis concluded that hydrogen increase with current was better described by a linear function with proportional constant of approximately 0.7 or 70%. different from the gma welding transfer behavior, statistical analysis showed only a small increase in metal droplet size with increasing current. the metal transfer mode remained in the globular range for currents between 100 and 150 a. the most surprising findings were with the high-speed cinematography recording. observing the high speed movies, it was possible to see that at low current, "unmelted" flux sporadically touched the weld pool but at higher current, the flux remained touching the weld pool during the whole time of droplet formation and transfer. it is believed that since the flux has ingredients that contain hydrogen, hydrogen passes through the arc undisturbed, going to the weld bead intact and increasing the hydrogen content in the weld metal. another important observation is regarding to droplet size. droplet size increased with increasing current because forces from decomposed gases from the flux could sustain the droplets, retarding their transfer and allowing them t
Forma??o e caracteriza??o óptica de filmes automontados de POMA/PPV
Melo, Rodrigo M.;Dantas, Noelio O.;Souza, Nara C. de;Oliveira Jr., Osvaldo N.;Faria, Roberto M.;Marletta, Alexandre;
Química Nova , 2003, DOI: 10.1590/S0100-40422003000200006
Abstract: a study is presented of the formation and optical properties of polymeric heterostructures from poly(p-phenylene vinylene) (ppv) and poly(o-methoxyaniline) (poma) produced via the self-assembly technique. poma layers were obtained in a non self-limiting process from its emeraldine salt, semiconducting form in hcl solution. thermal conversion of ppv was performed at low temperatures with the substitution of the counter-ion cl in the ppv precursor by a long sulfonic chain, the dodecylbenzenesulfonate (dbs) ion. the optical properties of ppv films converted in this way are not affected by poma, which can be used as transparent electrode of ppv luminescent devices.
Arterite de Takayasu e Gesta??o: Relato de Caso
Ximenes, M?nica de Souza Visniewski;Oliveira, Sinval Ferreira de;Machado, Ant?nio Vieira;Corrêa, Mário Dias;Couto, Júlio César de Faria;
Revista Brasileira de Ginecologia e Obstetrícia , 2000, DOI: 10.1590/S0100-72032000000200009
Abstract: takayasu's arteritis is an idiopathic occlusive inflammation of the aorta and its major branches. the disease shows a striking predilection for young women and thus is occasionally associated with pregnancy. the authors describe a case of a pregnant patient with takayasu's arteritis. the pregnancy was accompanied by a multidisciplinary group in a satisfactory way. there was only one hospitalization due to an exacerbation of the symptoms during the 32nd week of gestation, controlled by medical treatment. a vaginal delivery occurred at 37 weeks. a live infant weighing 2,750 g was delivered and the patient had an uncomplicated course.
Estudo das características antiincrustantes de materiais
Faria, Estael Araújo de;Branco, José Roberto Tavares;Campos, M?nica de Cássia Souza;Oliveira, Márcia Divina;Rolla, Maria Edith;
Rem: Revista Escola de Minas , 2006, DOI: 10.1590/S0370-44672006000200014
Abstract: the golden mussel or limnoperna fortunei is an invading organism that has caused much damage to water supply systems and hydroeletric power plants, and more recently, it is also causing damage to boat transportation in the "pantanal" waters of mato grosso. the present work, a laboratory and field study of the detachment force of the golden mussel, was carried on aiming at the understanding of its relationship with surface free energy and its components. the materials were chosen to cover an ample range of surface free energy, including materials with low surface energy, as polymers, and high surface energy, as the metallic materials. qualitatively, the performance of stainless steel and copper, tested in the laboratory and field, are consistent with respect to literature results. a linear correlation between surface free energy and mussel detachement force was verified but with a poor correlation coefficient, the strongest effect being due to hydrogen bonds.
Ionization and dissociation of the formic acid molecule by protons and electrons
Pilling, S.;Santos, A. C. F.;Boechat-Roberty, H. M.;Souza, G. G. B. de;Sant' Anna, M. M.;Barros, A. L. F.;Wolff, W.;Faria, N. V. de Castro;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000400011
Abstract: ionization and dissociation of the formic acid molecule (hcooh) by energetic charged particles have been studied for 1 kev electrons and nearly equivelocity 2 mev protons. whereas the fragmentation pattern induced by impact of electron and proton show close similarities, some distinctions in the fragmentation yields were observed for these equivelocity projectiles.
Studying Group Dynamics through Social Networks Analysis in a Medical Community  [PDF]
Ruben P. Albuquerque, Jonice Oliveira, Fabrício F. Faria, Rafael Monclar, Jano M. de Souza
Social Networking (SN) , 2014, DOI: 10.4236/sn.2014.32017
Abstract:

In 2008, the Brazilian Department of Science and Technology created the INCTs (Brazilian Science and Technology Institutes). One of them was the Cancer Control INCT. Due to its importance and considering that there are different groups working together in the same area, it is important that they collaborate intensely. Envisioning an empowerment of scientific collaboration, the BRINCA project was created to support a set of analyses of the social networks from this particular INCT. These analyses were created by mining curricular and publications bases, and identifying different types of scientific relationships and areas. We were able to observe, for instance, how the interaction is amongst researchers from related areas, which researchers were more collaborative and which ones were isolated from the network. These analyzes were used by the INCT coordination to understand and act to improve scientific collaboration.

Estado nutricional e capacidade funcional na úlcera por press?o em pacientes hospitalizados
Perrone, Francine;Paiva, Adriene Alexandra;Souza, Letícia Martins Ignácio de;Faria, Cássia da Silva;Paese, Márcia Carolina de Siqueira;Aguilar-Nascimento, José Eduardo de;Dock-Nascimento, Diana Borges;
Revista de Nutri??o , 2011, DOI: 10.1590/S1415-52732011000300006
Abstract: objective: this study investigated if pressure ulcer correlated with the nutritional status and functional capacity of hospitalized patients. methods: this cross-sectional study included 130 patients of two hospitals, 77 (59.2%) men and 53 (40.8%) women. the median age of the sample was 52 (14-85) years. seventy-two (55.4%) patients were hospitalized for clinical treatment, 40 (30.8%) for surgical treatment and 18 (13.8%) for intensive care. nutritional status was determined by subjective global assessment. the patients were then classified according to their functional capacity as bedridden or not. the number and severity of pressure ulcers was recorded. grades 3 and 4 pressure ulcer were considered severe and grades 1 and 2 were considered mild. results: the incidence of pressure ulcers in the studied population was 19.2% (n=25). pressure ulcer were not associated with gender, age and type of treatment. bedridden patients were 7.5 times more likely to have pressure ulcer (19/50; 38.0%) than those who could walk (6/80; 7.5%; or=7.5; ci95%: 2.7-20.7; p<0.001). the incidence of pressure ulcers in severely malnourished patients (20/49; 40.8%) was 10 times greater than that of better nourished patients (5/81; 6.1%; or=10.4 ci95%: 3.6-30.5; p<0.0001). according to multivariate analysis, both functional capacity (bedridden, or=9.2; ci95%: 2.8-30.1; p<0.001) and nutritional status (severe malnutrition, or=3.8; ci95%: 1.0-13.9; p=0.04) are associated with pressure ulcer. conclusion: pressure ulcers correlate directly with malnutrition and bedridden status in hospitalized patients.
Anti-inflammatory and analgesic potential of hydrolyzed extract of Agave sisalana Perrine ex Engelm., Asparagaceae
Dunder, Ricardo J.;Quaglio, Ana E. V.;Maciel, Rubens P.;Luiz-Ferreira, Anderson;Almeida, Ana C. A.;Takayama, Christiane;Faria, Felipe M. de;Souza-Brito, Alba R. M.;
Revista Brasileira de Farmacognosia , 2010, DOI: 10.1590/S0102-695X2010000300014
Abstract: the hemolytic, anti-inflammatory and antinociceptive properties from hydrolyzed extract agave sisalana perrine ex engelm., asparagaceae (heas) was evaluated on classic inflammation models. male swiss mice and male wistars rats received heas (500 mg/kg) in two administration p.o. and i.p. in saline solution 0.9%. the acid hydrolysis inhibited the hemolytic action of saponins due to the retreat of side chain sugar. the treatment of the ear induced oedema by xylene with heas significantly reduced in two routes 13±1.5 and 10±0.63 mg, respectively, p.o. and i.p., in comparison with controls 27±1.5 saline and 13.5±1.2 aas. the heas also diminished edema induced by carrageenin 43±1.58 mg (p.o.) and 17±1.26 mg (i.p.), when compared with control groups 52±1.58 mg (saline) and 10.05±1.58 (indomethacin). heas showed analgesic effects in abdominal constrictions 30.7% (p.o.), 88.7% (i.p.) comparable to that produced by (aas) 70.6%. however in granuloma cotton pellet a chronic model of inflammation just the i.p. pathway decreased granulomatous tissue (20.4±1.32 mg) compared with controls 30.5±2.53 mg (saline) and 20.2±2.18 mg (dexamethasone). these data suggest that heas has anti-inflammatory and analgesic activity on acute and chronic processes.
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