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Search Results: 1 - 10 of 83745 matches for " Tiago da Silva Alexandre "
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Determination of the Stabilization Time of the Solution-Air Interface for Aggregates Formed by NaC in Mixtures with SDS and PEO, Investigated by Dynamic Surface Tension Measurements  [PDF]
Grasiele Raupp, Arlindo C. Felippe, Tiago Elias Allievi Frizon, Luciano da Silva, Marcos Marques da Silva Paula, Alexandre G. Dal-Bó
Soft (Soft) , 2014, DOI: 10.4236/soft.2014.31001

The properties of mixtures of poly (ethylene oxide) (PEO) and mixed micelles formed from sodium cholate (NaC) and sodium dodecyl sulfate (SDS) in tris/HCl buffered solutions at pH 9.00 were investigated by measuring the mean surface tension. The variation in the superficial tension as a function of the time after formation of solutions containing PEO and NaC was characterized by monitoring the time required for the system to reach equilibrium between the micellar and aqueous phases. These results could serve as a reference for the minimum aging time required for solutions before any surface tension measurements can be performed.

Fatores associados à qualidade de vida em idosos com osteoartrite de joelho
Alexandre, Tiago da Silva;Cordeiro, Renata Cereda;Ramos, Luiz Roberto;
Fisioterapia e Pesquisa , 2008, DOI: 10.1590/S1809-29502008000400002
Abstract: this study inquired whether quality of life (qol) among elderly patients with knee osteoarthritis (oa) may be influenced by sociodemographic and/or clinic and functional factors. a sample of 40 elderly outpatients from a gerontological rehabilitation service in sao paulo answered the brazilian version of the 36-item short form survey (sf-36). functionality, joint stiffness and pain were assessed by the womac - western ontario and macmaster universities osteoarthritis index. further data on sociodemographic and clinical features, including pain-relieving strategies, were obtained by a complementary questionnaire. by means of linear regression analysis, an independent relationship was found between the womac functionality domain and six sf-36 domains (p<0.05). in the studied sample, poor qol was found to be correlated to difficulty in functional activities, using a gait assistive device, to present bilateral knee impairment, to resort to several means to relieve pain, as well being illiterate and living with another elderly (r=0.3; p<0.05). the most impaired functional activities were those that involve knee flexion and extension, and weight support on the affected limb. both sociodemographic and clinical, functional factors generated by oa negatively influenced qol of elderly patients with knee oa.
Factors associated to quality of life in active elderly
Alexandre,Tiago da Silva; Cordeiro,Renata Cereda; Ramos,Luiz Roberto;
Revista de Saúde Pública , 2009, DOI: 10.1590/S0034-89102009005000030
Abstract: objective: to analyze whether quality of life in active, healthy elderly individuals is influenced by functional status and sociodemographic characteristics, as well as psychological parameters. methods: study conducted in a sample of 120 active elderly subjects recruited from two open universities of the third age in the cities of s?o paulo and s?o josé dos campos (southeastern brazil) between may 2005 and april 2006. quality of life was measured using the abbreviated brazilian version of the world health organization quality of live (whoqol-bref) questionnaire. sociodemographic, clinical and functional variables were measured through crossculturally validated assessments by the mini mental state examination, geriatric depression scale, functional reach, one-leg balance test, timed up and go test, six-minute walk test, human activity profile and a complementary questionnaire. simple descriptive analyses, pearson's correlation coefficient, student's t-test for non-related samples, analyses of variance, linear regression analyses and variance inflation factor were performed. the significance level for all statistical tests was set at 0.05. results: linear regression analysis showed an independent correlation without colinearity between depressive symptoms measured by the geriatric depression scale and four domains of the whoqol-bref. not having a conjugal life implied greater perception in the social domain; developing leisure activities and having an income over five minimum wages implied greater perception in the environment domain. conclusions: functional status had no influence on the quality of life variable in the analysis models in active elderly. in contrast, psychological factors, as assessed by the geriatric depression scale, and sociodemographic characteristics, such as marital status, income and leisure activities, had an impact on quality of life.
Fatores associados à qualidade de vida de cuidadores de idosos em assistência domiciliária
Ferreira, Caroline Gomes;Alexandre, Tiago da Silva;Lemos, Naira Dutra;
Saúde e Sociedade , 2011, DOI: 10.1590/S0104-12902011000200012
Abstract: the aim of this study was to investigate whether the quality of life (qol) of caregivers of elderly individuals in home care is influenced by socio-demographic characteristics, the support network offered to the caregiver and variables related to the act of providing care. forty caregivers of elderly individuals in a home care program in the city of s?o paulo (brazil) were interviewed. qol was measured using the brazilian version of the medical outcomes study 36-item short-form health survey (sf-36). socio-demographic characteristics and variables related to the support network offered to the caregiver and to the act of providing care were obtained through a complementary questionnaire. linear regression analysis demonstrated an independent relation between greater number of hours dedicated to care and three sf-36 subscales: functional capacity, physical aspects and emotional aspects. having more than eight years of schooling denoted a better score on the general health state subscale and a worse score on the social aspects subscale. caregivers over 60 years of age achieved a worse score on the physical aspects subscale and women achieved a worse score on the pain subscale. sons/daughters or spouses who take care of their parents or partners achieved a worse score on the emotional aspects domain. caregivers who had changed their routine in order to offer care achieved a worse score on the mental health subscale. socio-demographic factors, the support network offered to the caregiver, and factors related to the dynamics of care can have a negative influence over the qol of the main caregivers of elderly individuals in home care.
Produtividade e características tecnológicas de cultivares de feij?o em resposta à calagem superficial em plantio direto
Silva, Tiago Roque Benetoli da;Lemos, Leandro Borges;Crusciol, Carlos Alexandre Costa;
Bragantia , 2011, DOI: 10.1590/S0006-87052011000100026
Abstract: the objective of this study was to evaluate the effect of liming on yield and technological characteristics common bean cultivars under no-tillage system. the study was carried out during two crop seasons, on a dystrophic red latosol, under rainfed conditions. responses were assessed using a split-plot design with four replications. the main plots were represented by the common bean cultivars (carioca, iac carioca eté, pérola, iapar 81 and campe?o 2) and the split plots were represented by the rates of dolomitic limestone (0; 1.8; 3.6 and 5.4 t ha-1). the cultivars differed in yield performance according to lime rates under no-tillage system. campe?o 2 had the best performance over the two years and iapar 81 responded linearly to the increasing lime rate on the second crop season. the interaction common bean cultivar x lime rates had an effect on the cooking time of the beans. iapar 81 presented an increase in cooking time as the rate of lime was increased along the two crop seasons. pérola had the same effect, but only on the second crop season. crude protein ranged between 210 and 230 g kg-1 and hydration ratio was close to 2. neither protein nor hydration ratio were influenced by lime rates or cultivars.
Common bean cultivars response to lime surface application under no tillage system Resposta de cultivares de feijoeiro comum à calagem superficial em semeadura direta
Tiago Roque Benetoli da Silva,Leandro Borges Lemos,Carlos Alexandre Costa Crusciol,Ciro Franco Fiorentin
Semina : Ciências Agrárias , 2012,
Abstract: Soil acidity in no tillage system, if not in high situations, can be neutralized by lime surface application, improving mineral nutrition and crop yield. Aiming to evaluate the agronomic performance of common bean cultivars, to surface lime application, in no tillage system, an experiment was conducted in Oxisol, Botucatu Municipal District, S o Paulo State, Brazil. The experimental design was a complete randomized block in split plot with four replications, where the plots were formed by common bean cultivars (Carioca, IAC Carioca Eté, Pérola, IAPAR 81 e Campe o 2) and subplots consisted of surface application of dolomitic limestone (zero, 1.8 t ha-1, 3.6 t ha-1 and 5.4 t ha-1). The surface lime application on the soil occurred in October 2002 and subsequently the sequence millet (spring) – beans (summer) – oat (autumn-winter) were planted under rainfed conditions. Bean cultivars sowing were done on December 17, 2003. It can be concluded that there is influence of cultivars and limestone surface application under no tillage, where IAPAR 81 showed better grain yield with the increase of lime rates, obtaining values of 2,025 kg ha-1 without the lime application to 2,655 kg ha-1 with 5.4 t ha-1 lime rate, obtaining 31% yield increase. A acidez do solo no sistema de semeadura direta, caso n o se encontre em situa es elevadas, pode ser resolvida com aplica o superficial de calcário, melhorando a nutri o mineral e a produtividade das culturas. Com o objetivo de avaliar o desempenho agron mico de cultivares de feijoeiro, em raz o da aplica o superficial de calcário, em semeadura direta, foi realizado um experimento num Latossolo Vermelho distrófico, em Botucatu (SP). O delineamento experimental foi o de blocos casualizados, em esquema de parcelas subdivididas com quatro repeti es, onde as parcelas foram formadas por cultivares de feij o comum (Carioca, IAC Carioca Eté, Pérola, IAPAR 81 e Campe o 2) e as subparcelas constituídas pela aplica o superficial de doses de calcário dolomítico (zero; 1,8 t ha-1; 3,6 t ha-1 e 5,4 t ha-1). A aplica o de calcário superficialmente no solo ocorreu em outubro de 2002 e posteriormente utilizou-se a sucess o milheto (primavera) – feij o (ver o) – aveia preta (outono-inverno) em condi es de sequeiro. A semeadura das cultivares de feij o foi realizada em 17 de dezembro de 2003. Pode-se concluir que existe influência da intera o dos fatores cultivares e doses de calcário aplicado superficialmente no solo em semeadura direta, onde a cultivar IAPAR 81 se destacou com aumento da produtividade de gr os a medida que houve in
Comparison of Experimental Methods to Assess the Competitive Ability of Weed Species  [PDF]
Leandro Galon, Germani Concen?o, Gismael Francisco Perin, Alexandre Ferreira da Silva, Cesar Tiago Forte, Felipe de Adelio David, Lauri Louren?o Radüz, André Luiz Radunz, André Andres, Siumar Pedro Tironi, Samara Emerim Concen?o
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.613221
Abstract: Competition between crops and weeds interfere on growth and development with harm to one or both, in different ways. To quantify these differences in competition, additive and replacement series study methods are most often used, each with different characteristics and goals. Therefore, we aimed with this work to study inter-specific competition between plants of soybean and corn against the weeds Bidens pilosa (beggartick) and Digitaria insularis (sourgrass), by two experimental methods of study: additive and replacement series (substitutive) experiments. Initial tests were performed prior to the installation of replacement series experiments to describe the intra-specific competition features for all species. For additive experiments these are unnecessary. To compare the methods of study, there were two sets of trials (an additive and a substitutive) installed under greenhouse, during the growing season 2013/14. Variables analyzed were leaf area and dry weight of shoots of crops and weeds, at 50 days after emergence. The results were analyzed according to the methods used, these being compared. It was found that the additive method supplied results most prone to be applied in the field, while the replacement series (substitutive) method was more appropriate for studies that aimed to provide detailed scientific information regarding the proportions of plants and coefficients describing the behavior of the species community.
Influência da época de semeadura e do manejo da parte aérea de milheto sobre a soja em sucess?o em plantio direto
Lemos, Leandro Borges;Nakagawa, Jo?o;Crusciol, Carlos Alexandre Costa;Chignoli Júnior, Warlei;Silva, Tiago Roque Benetoli da;
Bragantia , 2003, DOI: 10.1590/S0006-87052003000300007
Abstract: crop residues management must be adequate in no-tillage systems. winter millet has shown to produce crop residues of slow decomposition in adequate amounts. the experiment aimed to study growing millet in three sowing times (5/mar, 25/mar and 19 apr/99, under rainfed conditions, five types of crop cut management (at each flowering and no residues; at each flowering with residues; at flowering and no residues; at flowering with residues, no cut) and its effects on soybean yield, grown in succession. it was concluded that millet sown in march and cut at the time of each flowering provided the greatest amounts of crop residues. in general, millet produced large amounts of crop residues and for the 5/mar and 19/apr sowing dates, provided the greatest yields for soybean in succession.
Simula??o computacional de um processo de trefila??o para produ??o de barras redondas de a?o AISI 1045
Rocha, Alexandre da Silva;H?nisch, Stephan;Coser, Tiago Brun;Souza, Tomaz Fantin de;Soares, Carla Adriana Theis;
Rem: Revista Escola de Minas , 2011, DOI: 10.1590/S0370-44672011000500018
Abstract: in this work, the wire-drawing production step for the production of aisi 1045 steel bars was numerically simulated. different parameters necessary for the simulation were estimated based on current combined industrial drawing processes. ring compression tests were carried out and simulated aiming at the determination of the friction value to be used in the simulation. from the numerical simulation results, the capacity of the simulation for estimating the drawing forces by comparison with analytical and empirical equations was evaluated. besides this, an effort was made to simulate the residual stresses after drawing. the simulated residual stress profiles were then compared to experimental residual stresses profiles, which were obtained in a neutron diffraction experimental analysis carried out on industrial samples. based on this work, the possibility of using simulation to quantitatively calculate residual stresses after the cold drawing was discussed. the carried out analysis will be used to implement improvements in the drawing process.
Rela o entre for a de preens o manual e dificuldade no desempenho de atividades básicas de vida diária em idosos do município de S o Paulo
Tiago da Silva Alexandre,Yeda Aparecida de Oliveira Duarte,Jair Lício Ferreira dos Santos,Maria Lúcia Lebr?o
Saúde Coletiva , 2008,
Abstract: Este es un estudio de base poblacional con el objetivo de analizar la fuerza de presión manual (FPM) en ancianos dependientes e independientes en actividades básicas de vida diaria (ABVD). La muestra fue constituida por 1849 ancianos participantes del estudio SABE. Fueron evaluados la FPM y el índice de masa corporal (IMC). Los ancianos fueron divididos en independientes y dependientes. Todos los desnutridos, excepto las mujeres de 80 a os o más presentaron diferencia con relación a las medias de FPM, así como las mujeres y hombres eutróficos con 60 69 a os, mujeres con sobrepeso de 80 a os o más y hombres obesos con 70 a os o más. Los géneros presentaron diferencia en las medias de FPM teniendo los ancianos mayor FPM que las ancianas. Ancianos con o sin dependencia presentaron diferencias entre las medias de FPM
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