oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 13 )

2018 ( 13 )

2017 ( 17 )

2016 ( 33 )

Custom range...

Search Results: 1 - 10 of 10534 matches for " Elaine Carballo Siqueira;Monteiro "
All listed articles are free for downloading (OA Articles)
Page 1 /10534
Display every page Item
The effect of cyclic torsion on the dislocation structure of drawn mild steel
Aguilar, Maria Teresa Paulino;Corrêa, Elaine Carballo Siqueira;Monteiro, Waldemar Alfredo;Cetlin, Paulo Roberto;
Materials Research , 2006, DOI: 10.1590/S1516-14392006000300016
Abstract: cold forming is usually associated with the "work hardening" of the material being formed. the work hardening behavior of metals subject to complex processing paths is different from that in monotonic deformation. the results show that, after some initial hardening, there is a possibility that further deformation will cause softening in the material ("work softening"). recent work showed that cyclic torsion applied to drawn products causes changes in the subsequent tensile behavior of low carbon steel, and that the effect will depend on the previous "history" of the material. for annealed samples, the cyclic torsion leads to an increase in the yield strength, but does not affect the tensile strength and elongation. for the case of previously drawn bars, the cyclic deformation caused a decrease in the yield and tensile strength and an increase in the total elongation. the present paper discusses the dislocation structure changes associated with different strain paths in mild steel.
Work softening of drawn low carbon steel bars
Aguilar Maria Teresa Paulino,Corrêa Elaine Carballo Siqueira,Monteiro Waldemar Alfredo,Ferreira Nildemar Aparecido Messias
Materials Research , 2001,
Abstract: The work hardening of metals subjected to complex processing paths is different from that in monotonic deformation. Changes in the deformation mode can promote transients in the strain-hardening rate, leading to anomalous softening or hardening of the material. This paper investigates the influence of strain path changes on the tensile behavior of drawn 0.12% steel rods. Annealed or predrawn specimens were submitted to cyclic twisting and then tested in tension. The results show that the cyclic deformation causes changes in the mechanical behavior of the metal, and the effect will depend on the previous "history" of the material. Cyclic twisting causes hardening in annealed samples, but leads to softening of the drawn bars. These phenomena are in line with the corresponding substructural aspects.
Work softening of drawn low carbon steel bars
Aguilar, Maria Teresa Paulino;Corrêa, Elaine Carballo Siqueira;Monteiro, Waldemar Alfredo;Ferreira, Nildemar Aparecido Messias;Cetlin, Paulo Roberto;
Materials Research , 2001, DOI: 10.1590/S1516-14392001000200008
Abstract: the work hardening of metals subjected to complex processing paths is different from that in monotonic deformation. changes in the deformation mode can promote transients in the strain-hardening rate, leading to anomalous softening or hardening of the material. this paper investigates the influence of strain path changes on the tensile behavior of drawn 0.12% steel rods. annealed or predrawn specimens were submitted to cyclic twisting and then tested in tension. the results show that the cyclic deformation causes changes in the mechanical behavior of the metal, and the effect will depend on the previous "history" of the material. cyclic twisting causes hardening in annealed samples, but leads to softening of the drawn bars. these phenomena are in line with the corresponding substructural aspects.
Behavior of surface integrity in cylindrical plunge grinding using different cooling systems
Silva, Leonardo Roberto;Mattos, Mariana Faccio;Amaral, Lucimar Venancio;Corrêa, Elaine Carballo Siqueira;Brand?o, Joel Romano;
Materials Research , 2011, DOI: 10.1590/S1516-14392011005000022
Abstract: the superficial texture of the material can exert a decisive influence on the application and performance of the machined component. the conventional fluids used in grinding processes are environmental risk and can also be dangerous to the health. the disposal of these toxic fluids is expensive and the contamination in the proximities of the machines can present risks to the health for the personnel in the shop floor. this paper analyzes the performance of the minimum quantity lubricant (mql) technique and compares it with the conventional cooling method, developing an optimized fluid application method using a specially designed nozzle, through which a minimum amount of oil is sprayed in a compressed air flow. this paper also explores and discusses the concept of the mql in the grinding process of hardened aisi 4340 steel. the performance of the mql technique in grinding was evaluated based on an analysis of the surface integrity (roughness, microstructure and microhardness). as a result, it was realized that the mql technique provides very similar characteristics to conventional process and can be applied in industry, thus contributing to an environment friendly manufacturing.
Constituintes químicos das flores de Pterogyne nitens (Caesalpinioideae)
Regasini, Luis Octávio;Fernandes, Daniara Cristina;Castro-Gamboa, Ian;Silva, Dulce Helena Siqueira;Furlan, Maysa;Bolzani, Vanderlan da Silva;Barreiro, Eliezer Jesus;Cardoso-Lopes, Elaine Monteiro;Young, Maria Cláudia Marx;Torres, Luce Brand?o;Vellosa, José Carlos Rebuglio;Oliveira, Olga Maria Mascarenhas de;
Química Nova , 2008, DOI: 10.1590/S0100-40422008000400018
Abstract: the phytochemical investigation of the flowers of pterogyne nitens (caesalpinioideae) resulted in the isolation and identification of nine phenolic derivatives, quercetin 3-o-sophoroside, taxifolin, astilbin, ourateacatechin, caffeic, ferulic, sinapic, chlorogenic and gallic acid, besides two guanidine alkaloids, pterogynine, pterogynidine. this is the first time these compounds have been reported in p. nitens flowers. as this is a monospecific genus, these secondary metabolites may have taxonomical significance. their structures were assigned on the basis of spectroscopic analyses, including two-dimensional nmr techniques.
Conhecimento do cliente diabético em rela??o os cuidados com os pés
Barbui, Elaine Cristina;Cocco, Maria Inês Monteiro;
Revista da Escola de Enfermagem da USP , 2002, DOI: 10.1590/S0080-62342002000100014
Abstract: the objective of this research is to evaluate how much the clients that frequently went to the diabetes ambulatory, knew about their own ill, and the feet care. in the sample - diabetes type 2 - the majority were people with more than fifty years old and 71.8% were diabetics for more than ten years. so the conclusion that could be taken is that the clients knew about the care that they must have with their feet to don't have complications, but the "own care" is not well done. to insert it in the rightly on their day-by-day they must have acess to the information about diabetes, participation of the family, motivation and their own hability.
Amamenta??o na infancia e obesidade na idade escolar em famílias de alto nível socioecon?mico
Siqueira,Renata Scanferla de; Monteiro,Carlos Augusto;
Revista de Saúde Pública , 2007, DOI: 10.1590/S0034-89102007000100002
Abstract: objective: to examine the association between breastfeeding and obesity in school-age children from brazilian families of high socioeconomic status. methods: a cross-sectional study was conducted including 555 students aged six to 14 years from a private school in the city of sao paulo. obesity - the outcome variable - was defined as body mass index at or above the 85th centile plus sub scapular and triceps skin folds at or above the 90th centile using the sex and age specific standards of the us national center for health statistics. exposure was the frequency and duration of breastfeeding. potential confounders, controlled for using multiple logistic regression, included child sex, age, birthweight, and dietary and physical activity patterns, and maternal age, body mass index, schooling, and practice of sports or physical exercise. results: prevalence of obesity in the studied population was 26%. after confounder adjustment, the risk of obesity in children that had never been breastfed was twice that of other children (or=2.06; 95% ci: 1.02; 4.16). there was no dose-response effect of duration of breastfeeding on prevalence of child obesity. conclusions: children who were never breastfed showed greater prevalence of obesity at school age. the absence of a dose-response effect in the relationship between duration of breastfeeding and prevalence of obesity and the still controversial findings regarding this association reported by other authors indicate a need for further studies on the subject, in particular studies with longitudinal design.
Percep??es e motiva??es de agentes comunitários de saúde sobre o processo de trabalho em Teresina, Piauí
Costa, Elaine Monteiro da;Ferreira, Danyege Lima Araújo;
Trabalho, Educa??o e Saúde , 2011, DOI: 10.1590/S1981-77462011000300007
Abstract: community health agents (chas) are considered important for the implementation of the sus (sistema único de saúde/single health system), especially for reinforcing primary health care. their work may lead to situations that generate realization and/or experiences that are determining for motivation. this study aims to characterize the labor process of the chas in an area of teresina, state of piauí, brazil, describing their perceptions about work and their motivations. thirty-one chas took part in the study. this is an exploratory and descriptive qualitative review. in order to collect data, we used the focus group method. six focus groups were held, one per family health team belonging to the territory. the discussions were based on three guiding questions, recorded in mp4, and then transcribed and categorized. five categories were created to present and discuss the results. it was noticed that the chas have an understanding of the importance of their work, but they feel discouraged for not getting support and recognition, in certain situations, from the community, the team itself, and from the city's management. there is a desire for the appreciation of their work.
Aflatoxinas: um risco a saúde humana e animal / Aflatoxins: a risk animal and human health
Helder Ferreira,Elaine Pittner,Hermes Francisco Sanches,Marta Chagas Monteiro
Ambiência , 2006,
Abstract: O Aspergillus flavus e a subespécie próxima relacionada parasiticus têm sido reconhecidas por muito tempo como contaminadores principais de produtos organicos e inorganicos. A. flavus, um fungo comum do solo, pode infestar uma larga escala de produtos agrícolas. Algumas variedades de A. flavus produzem as aflatoxinas, que s o toxinas neoplásicas capazes de induzir neoplasia hepática em animais de laboratório. O crescimento de A. flavus e a biossíntese da aflatoxina depende da carca a, da umidade, da temperatura, do pH, da aera o e da microflora competindo. As aflatoxinas s o consideradas contaminantes naturais; cuja aproxima o ideal de controle é a preven o do crescimento do fungo e produ o das aflatoxinas nos produtos. As aflatoxinas (B1, B2, G1 e G2) s o metabólitos secundários associados à toxicidade causada por alimenta es em animais. As aflatoxinas s o relatadas como sendo hepatotóxicas, mutagênicas, imunossupressora e neoplásicas. A exposi o as aflatoxinas dietéticas é considerada um fator de risco importante para o desenvolvimento de neoplasia hepatocelular em determinadas regi es do mundo. A indu o de adutos no DNA pela aflatoxina B1 no fígado foi revista extensivamente em uma avalia o quantitativa de fatores de risco a neoplasias por aflatoxinas. As aflatoxinas s o pró-neoplásicas, reagindo com o ácido desoxirribonucléico (DNA), ácido ribonucléico (RNA) e as proteínas. Atualmente, vários avan os científicos têm sido feitos a fim de compreender a toxicologia clínica das aflatoxinas.
Les?es esportivas: um estudo com atletas do basquetebol bauruense
Dario, Bruno Estevan Siqueira;Barquilha, Gustavo;Marques, Reinaldo Monteiro;
Revista Brasileira de Ciências do Esporte , 2010, DOI: 10.1590/S0101-32892010000300014
Abstract: this study aimed to identify key injuries in basketball and its impact. in the present study the participants were 20 male basketball players aged between 13 and 15 years. the instrument used was the questionnaire and its results showed that the athletes participating in the study, all reported some type of injury. 26 lesions were identified, of which 13 in the lower limbs (50%), 13 upper limbs (50%). with the knee injuries were the most frequent patellar tendinitis 7 cases (53.85%). in the upper limb are highlighted sprains of fingers with 5 cases (38.46). this study realized the need to develop a preventive work in order to reduce the incidence of these injuries.
Page 1 /10534
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.