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Preparação e caracterização de blendas de PANI/ABS
(Universidade Federal de São Carlos, 2009-03-16)
Cristovan, Fernando Henrique
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Souza, Ernesto Chaves Pereira de
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https://lattes.cnpq.br/1505400360366643
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https://lattes.cnpq.br/5410652307562354
Polyaniline (PANI) chemical synthesis was monitored in situ by means of electrochemical impedance, open circuit potential (Voc) and mass variation. We verify that the final properties of the polymer could be practically defined after inflection point in the potential profile. The impedance data were decisive to understand this behavior, showing only a small change after inflection point. Impedance results and mass variations during the synthesis contributed to understand the induction mechanisms that occur in the initial stages of the polymerization process. Also, it was performed an investigation on the influence of different variables (temperature, monomer:oxidant molar ratio, oxidant, pH value, use of inert salts at high concentrations) in the PANI chemical synthesis process as well as in its physicochemical properties. In this work, it was estimated the characteristic points of PANI through the Voc measurements during the chemical synthesis, based on an experimental design methodology. This methodology allowed an efficient mapping of PANI synthesis process as well as its interactions with each variable previously described. The results indicated that the oxidant employed in the synthesis influences in the final chemical and physical properties of this polymer. The studies performed on the final properties of PANI were the degree of oxidation and electric resistivity. Moreover, the yield the degree of polymerization was also evaluated. The experimental design methodology was also used in order to understand the influence of the preparation conditions on the final properties of the blends in poly(acrylonitrile-butadiene-styrene) (ABS) and polyaniline obtained by the co-dissolving components in a common organic solvent. The variables evaluated were the PANI content in the blend, m-cresol:chloroform rate (solvent ratio), dopant (DBSA or CSA) and acrylonitrile content in the ABS. The results showed that these variables are able to change significantly the flexibility and electric conductivity of the blends. On the other hand, the dopant used mainly influences in the conductivity, suggesting that the DBSA is the better for the development of PANI/ABS blends more conductive. After better prepare conditions of the blends, the percolation threshold was established at around 3 wt% of PANI, forming a flexible blend with conductivity of approximately 3 S.cm-1. The optical properties of the blend films were characterized by UV Vis-NIR. The conduction mechanisms of the blends were investigated using a dc electric conductivity in the range from 80 to 320 K. Using the Mott s theory, it was found that the conductivity in the blends is a threedimensional variable range hopping mechanism. The Mott s temperature values, density of states at the Fermi energy, average hopping distance and barrier height for the blends were calculated and discussed in this work. Also, two possible technological applications were proposed to the PANI/ABS system, including: composite varistors and antistatic or electromagnetic protection of electronic devices. The varistors were prepared with 30% of PANI, which showed a low rupture voltage at around 10 V and a non linearity coefficient of approximately 9,2. On the paint shape and when deposited on cardboard, this material can be employed as protector system of electronic devices. Another important characteristic is the conductivity of this material, which is controlled by the number of paint layers deposited on the cardboard.
Logística reversa de pós-venda para alimentos derivados de carne e leite : análise dos retornos de distribuição
(Universidade Federal de São Carlos, 2009-03-16)
Chaves, Gisele de Lorena Diniz
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Alcântara, Rosane Lúcia Chicarelli
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https://lattes.cnpq.br/0319559373628489
Reverse logistics has conquered more importance and space in the companies logistics operation, mainly for its economic potential, but also for the change in the customers consumption culture and for the increase of the importance of environmental preservation. However, the lack of studies in this direction makes it difficult to visualize the advantages of the reverse logistics application. In such a way, the objective of this study is to understand the reverse flow configuration, as well as its critical points, the inherent performance measures to the process and the strategic use of after-sale reverse logistics to the reverse flows management in meat and dairy food distribution channels. Qualitative studies have been developed, in France and Brazil, with the multiple-cases study methodology. In France, two dairy manufacturers and a food retailer have been interviewed and, in Brazil, four meat and dairy manufacturers and three food retailers have been interviewed. In the thesis, the results have been presented and analyzed for each country, and they also have been compared with literature. From the results analysis, it was possible to identify that after-sale reverse logistics has a strategic use for the industrial companies. The main processes of reverse logistics used by the studied companies are the resale in original market, the resale in other markets, the landfill and the loads consolidation for manufacturer collection. The gatekeeping (mainly for the retail) and the existence of collaborative relations between the companies have been considered the most critical factors to reverse logistics management. However, the brazilian companies have affirmed that the retailers uses the coercive power, mainly, to impose to the industry a way to manage the reverse flows. Moreover, the performance measures used by the manufacturers and retail companies in the meat and dairy food distribution channel have been shown. The most used performance measures are: total reverse logistics cost, cost of returned merchandises, cost of deteriorated products, cost of pallet and packing returns, perfect order fulfillment, return percentage and return reason. With this analysis, it was possible to provide recommendations and reference parameters for reverse logistics of perishable food as the derivatives of meats and milk.
Cuidador de idosos com doença de Alzheimer: efeitos de grupos psico-educacionais e suporte domiciliar individualizado
(Universidade Federal de São Carlos, 2009-03-16)
Faleiros, Danilo Augusto de Melo
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Barham, Elizabeth Joan
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https://lattes.cnpq.br/9868595523538592
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https://lattes.cnpq.br/3495858672379185
Dementia involves the loss of cognitive functions, interfering with the execution of even the most basic tasks of everyday life. Family eldercare providers are central figures in guaranteeing the wellbeing of their elderly relatives who develop dementia. However, when such a person becomes dependent on other family members, in addition to an increase in the caregiver s domestic chores, the behavior problems that arise can have a negative impact when caregivers are not well prepared for this situation, making the caregivers more susceptible to depression and contributing to the deterioration of their own physical and psychological wellbeing, making the caregiving context even more difficult. The objective of this study was to analyze the effects of psycho-educational support groups (PEG) for people caring for a relative with Alzheimer s disease (AD), associated with individual, home visits that were either training-oriented (Experimental Group EG) or listening-oriented (Control Group CG) in nature, with respect to the participants perceptions of burden, depressive symptoms and quality of life. The nine participants were randomly assigned to either the EG and CG. The EG participants received encouragement and assistance in operationalizing the concepts learned in the PEG, which addressed strategies for managing stress and depression and provided training in some of the social skills that are useful in establishing new routines (praise, constructive criticism, and asking for help). The CG received visits of the same duration, bus focused only on listening. The participants were interviewed about their situation, but did not receive individual assistance in operationalizing the strategies presented in the PEG. At the end of the first phase of the intervention, each group received the other type of home-based intervention. The data were analyzed using nonparametric tests (Mann-Whitney and Wilcoxon). The psycho-educational groups were effective in transmitting information, but did not reduce the caregivers perceptions of burden, reporting of depressive symptoms or change their quality of life ratings. After the caregivers received the training-oriented home visits (TV), their perceptions of burden significantly decreased and their quality of life ratings increased. The listeningbased visits had no significant effects on the caregivers. Six months later, an analysis of the follow-up measures indicate that improvements in perceptions of burden, frequency of depressive symptoms and quality of life scores were maintained by those who experienced the PEG coupled with TV. In conclusion, it is clear that professionals who offer orientation programs for family members caring for elderly relatives who have AD should further invest in evaluating the influence of home visits that focus on assisting these caregivers in adjusting their managerial and coping strategies, so as to increase our knowledge of how to blend group-based and individual psycho-educational supports in order to maximize the effects of such interventions.
A pedagogia do sexo em O Ateneu: o dispositivo de sexualidade no internato da "fina flor da mocidade brasileira"
(Universidade Federal de São Carlos, 2009-03-18)
Balieiro, Fernando de Figueiredo
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Escudeiro, Richard Miskolci
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https://lattes.cnpq.br/1623888309974862
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https://lattes.cnpq.br/1754073430664136
Família Weibull de razão de chances na presença de covariáveis
(Universidade Federal de São Carlos, 2009-03-18)
Gomes, André Yoshizumi
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Louzada Neto, Francisco
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https://lattes.cnpq.br/0994050156415890
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https://lattes.cnpq.br/0876304287501690
The Weibull distribuition is a common initial choice for modeling data with monotone hazard rates. However, such distribution fails to provide a reasonable parametric _t when the hazard function is unimodal or bathtub-shaped. In this context, Cooray (2006) proposed a generalization of the Weibull family by considering the distributions of the odds of Weibull and inverse Weibull families, referred as the odd Weibull family which is not just useful for modeling unimodal and bathtub-shaped hazards, but it is also convenient for testing goodness-of-_t of Weibull and inverse Weibull as submodels. In this project we have systematically studied the odd Weibull family along with its properties, showing motivations for its utilization, inserting covariates in the model, pointing out some troubles associated with the maximum likelihood estimation and proposing interval estimation and hypothesis test construction methodologies for the model parameters. We have also compared resampling results with asymptotic ones. Coverage probability from proposed con_dence intervals and size and power of considered hypothesis tests were both analyzed as well via Monte Carlo simulation. Furthermore, we have proposed a Bayesian estimation methodology for the model parameters based in Monte Carlo Markov Chain (MCMC) simulation techniques.
Citogenética clássica e molecular em peixes neotropicais. Estudos comparativos entre bacias hidrográficas com ênfase em região de transposição de rio
(Universidade Federal de São Carlos, 2009-03-19)
Silva, Elisangela Bellafronte da
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Moreira Filho, Orlando
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https://lattes.cnpq.br/3927076022470557
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https://lattes.cnpq.br/9770317966023000
Basic and molecular cytogenetic studies were carried out in a few fish species from family Parodontidae: Apareiodon ibitiensis, A. piracicabae, A. affinis, A. vladii, Apareiodon sp. Parodon nasus and Parodon hilarii. All were collected in distinct hydrographic basins, with emphasis in a river transposition area, more specifically of the Piumhi River. Apareiodon. ibitiensis from the Upper Paraná River and Apareiodon sp. A from the São Francisco River presented the same chromosomal characteristics, as also observed in A. piracicabae in relation to Apareiodon sp. B. The presence of simple sex chromosomes of the ZZ/ZW type was verified in A. ibitiensis and Apareiodon sp., where the presence of the heterochromatin that originated the W chromosome was identified through C-band staining with propidium iodide. Fluorescent in situ hybridizations (FISH) with 18S and 5S ribosomal DNAs were performed in A. affinis, A. piracicabae and A. ibitiensis, resulting in a single chromosome pair marked with 5S rDNA in the three species, all in distinct chromosome pairs. The 18S rDNA is also present in one pair in A. affinis and A. piracicabae, but was polymeric among A. ibitiensis populations. While the 18S rDNA is more conserved in the Parodontidae species, the 5S rDNA may be considered a cytotaxonomical character for the group. FISH with pPh2004 satellite DNA isolated from P. hilarii was also performed in A. piracicabae, A. ibitiensis, A. vladii, A. affinis, Apareiodon sp. and P. nasus, but markings were only found in P. nasus. and A. affinis. When compared to other species where FISH with pPh2004 was carried out, two groups form: 1) the presence of this DNA in all the Parodon species, and 2) the absence in almost of the analyzed Apareiodon species, suggesting the maintenance of these genera. After the chromosomal characterization and confirmation of the species Apareiodon ibitiensis and Apareiodon piracicabae, besides Parodon nasus in distinct localities of the São Francisco River basin (regions of the Três Marias and the Piumhi River transposition), a cytogenetic tracking of the Parodontidae species in this hydrographic basin was made possible, which can be justified through natural (Piumhi Pantanal) and anthropogenic (Piumhi River transposition) connections between the Upper Paraná and the São Francisco River basins. Besides the Parodontidae species, Gymnotiformes species (Eigenamnnia virescens and Gymnotus sylvius) also described for the Upper Paraná basin are distributed in the São Francisco basin, and the transfer probably occurred through the Pantanal or the transposition. Cytogenetic analyses with a larger number of tools in the family Parodontidae was important for a better understanding of the evolution of this fish group, besides having been an important tool in the comparison of allopatric Parodontidae, Gymnotidae and Sternopigydae species present in the Upper Paraná and São Francisco River basins.
Características temporais da concentração de material particulado na atmosfera da cidade de São Carlos - SP
(Universidade Federal de São Carlos, 2009-03-19)
Pozza, Simone Andréa
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Coury, José Renato
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https://lattes.cnpq.br/5530984461673946
The city of São Carlos, of medium size of São Paulo State, can be considered as representative of the Brazilian Southeast area, with agricultural activities practically equivalent to the industrial ones. As part of that profile, it possesses a series of sources of atmospheric pollution that include a considerable fleet of vehicles, agricultural burns and several industrial emissions. The time evolution of this environmental pollution has been reason of concern, once it can cause damages to the human health and to the environment. The present work studied these time characteristics, specifically for the case of particulate matter (PM) suspended in the atmosphere, from experimental data and through statistical models. The concentrations of PM10, PM2.5 and PM10-2.5 in the city of São Carlos were collected and analyzed. The period of study comprises the years from 1997 to 2006 for PM10 and from 2001 to 2006 for PM2,5 and PM10-2,5. Monthly averages were used for obtaining the models and the 30 (thirty) or 6 (six) final data were used for the validation of the forecast. The selection of the best model was made considering the smallest value of AIC (Akaike Information Criterion), through the successive variation of the parameters. Of the 10 models with smaller value of AIC, was chosen the one of smaller value and other with a smaller number of parameters. In the statistical analysis, the models that did not comply with the requirements of the Shapiro-Wilk tests (normality) and of steadiness were eliminated. In the three cases the model SARIMA represented the groups of studied data better, when compared with the Holt-Winters correlation. The model found for the series of data of PM10, was the SARIMA(1,0,0)×(1,0,1)6. In the second case, the concentration of PM2.5 the best model was the SARIMA(2,1,3)×(1,0,1)6. In the third case, the concentration of PM10-2.5, the best model was the SARIMA(2,0,2)×(1,0,0)6.
Terapia Assistida por Animais (TAA) e deficiência mental : análise do desenvolvimento psicomotor
(Universidade Federal de São Carlos, 2009-03-19)
Capote, Patricia Sidorenko de Oliveira
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Costa, Maria da Piedade Resende da
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https://lattes.cnpq.br/9027626823764846
Animal-assisted therapy (AAT) is used by health professionals to promote emotional, affectivity, cognitive, social and phisical development by animal-human interaction. AAT can use different animals and be indicated for several needs, as Mental Deficiency (MD). The objective of this study was to verify the effect of animals intervention (AAT) in the psychomotor development of children with MD. The used drawing was the experimental type with control groups. Twelve children ranging from 9 to 13 years of age were divided into two groups, separate in two groups at random, control group (CG) and experimental group (EG), that frequent the same specialized school institution. The established criteria for formation of the groups were: diagnosis of MD, the same economic level and do not present animals fear. The psychomotor development was evaluated by the following instruments: Motor evaluation of Rosa Neto; structured interview for survey of the participants' emotional aspects; structured interview for survey of the psychomotor and emotional aspects directed to the responsible individuals; and field diary. The procedure for the data collection was developed in the following stages: a- groups formation (experimental group-animals and professional intervention A group; and control group: 1- professional intervention without animals B group; 2- without intervention- C group); b- initial evaluation (motor evaluation and interviews with participants and responsible individuals from the three groups); cintervention with post-fact recordings (field diary) and d- final evaluation (motor revaluation and interviews with participants and responsible individuals). AAT was executed with two small dogs. The data were analyzed in a quantitative way and represented in graphs and tables. For the qualitative analysis, it was accomplished through the recordings obtained in the field diary and analysis of the answers of the interviews. The data were analyzed in an individual way and a comparison between control and experimental groups was made. It was concluded that AAT brings benefits to individuals with MD regarding the motor development, motivation and care with living beings.
Transcendência e abertura em Ser e Tempo
(Universidade Federal de São Carlos, 2009-03-20)
Pessoa, Rodrigo Rizério de Almeida e
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Lopes, Marisa da Silva
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https://lattes.cnpq.br/5427042421727621
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https://lattes.cnpq.br/6611847538668850
Desenvolvimento de procedimentos em fluxo envolvendo reatores em fase sólida e microssistema analítico construído com LTCC (Low Temperature Co-fired Ceramics) para a determinação de analitos de interesse farmacêutico
(Universidade Federal de São Carlos, 2009-03-20)
Suarez, Willian Toito
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Fatibello Filho, Orlando
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https://lattes.cnpq.br/9859737944357808
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https://lattes.cnpq.br/6680603267238159
The employment of flow injection systems to determination of N-acetylcysteine, captopril, dipyrone and fluoxetine hydrochloride in pharmaceutical formulations was investigated. The N-acetylcysteine was determinated employing a solid-phase reactor containing Zn3(PO4)2 immobilized in a polyester resin coupled to a flow injection system. The procedure was based on the chelation of Zn(II) ions with N-acetylcysteine in the solid-phase reactor, with consequent releasing of the complex Zn(II)-N-acetylcysteine of the reactor, this complex reacted with alizarin red S (VA) in borate buffer pH 9.0 generating the complex Zn(VA-BO3)3 which absorbance was measured spectrophotometrically at 540 nm. The second developed procedure was the determination of captopril (CAP) in pharmaceutical formulations employing a solid-phase reactor containing silver chrolanilate (Ag2C6Cl2O4) immobilized in a polyester resin. In this system occured the precipitation reaction of captopril with the Ag(I), producing in the reactor an insoluble salt between the CAP and the Ag(I) due to the lower solubility of the formed salt related to Ag2C6Cl2O4. After the formation of the insoluble salt in the reactor occured the releasing of chloranilate anion, C6Cl2O4 2-, that reacted with the Fe(III) producing the complex FeC6Cl2O4 + which was monitored spectrophotometrically at 528 nm. In another procedure, the N-acetylcysteine and captopril were determined separately in a flow injection system through the on-line of the Prussian blue formation. In this procedure, the N-acetylcysteine or the captopril were oxidized by Fe(III), producing Fe(II) that reacted with hexacyanoferrate(III) in a point of flow system, generating the Prussian blue (Fe4[Fe(CN)6]3), that was monitored spectrophotometrically at 700 nm. It was also proposed a flow injection system with merging zones and intermittent flow with turbidimetric detection to determination of fluoxetine hydrochloride in pharmaceuticals. This system was based on the formation of an insoluble salt (AgCl(s)) between the AgNO3 and the chloride of the hydrochloride of the fluoxetine molecule that was turbidimetrically detected at 420 nm. Finally, two procedures were developed employing a flow injection system to determination of dipyrone in pharmaceuticals using Fe(III) as chromogenic reagent. In the first procedure, it was employed an analytical microsystem constructed with LTCC and in the second one, it was used a flow injection system with merging zones without the use of microsystem. In these systems, occured the formation on-line of an blue chromophore between Fe(III) and the dipyrone that was monitored spectrophotometrically at 622 nm.
Um programa para aprimorar envolvimento paterno : impactos no desenvolvimento do filho
(Universidade Federal de São Carlos, 2009-03-20)
Cia, Fabiana
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Barham, Elizabeth Joan
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https://lattes.cnpq.br/9868595523538592
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https://lattes.cnpq.br/5999108571365402
Children who do not have a positive, secure and affectionate relationship with their fathers, or whose fathers use rigid disciplinary practices, provide inadequate supervision and have infrequent or poor quality interactions with their children, are at greater risk for developing socio-emotional problems and for remaining at lower levels of academic achievement. However, the majority of fathers have little understanding of the importance of their involvement with their children. As such, the primary objective of this study was to evaluate a program designed to improve father involvement and to stimulate the use of parenting practices that foster children s pro-academic behaviors, using measures obtained before and after the intervention as well as one year later (follow-up). The specific objectives included: (a) the comparison of indicators of work conditions, personal and family wellbeing, father involvement and the parents social skills on the pre, post and follow-up tests among the Experimental Group 1 (EG1 composed of fathers who were randomly selected to participate in the intervention program), Experimental Group 2 (EG2 composed of randomly selected mothers who participated in the intervention program) and a Control Group (the remaining, waitlisted parents); (b) comparison of the academic achievement, self concept, behavior problems and social skills of their children at the time of the pre, post and follow-up tests, for those in the EG1, EG2 and CG; (c) examination of the strength of the correlations among these variables, and (d) analysis of parent evaluations of the topics that were addressed and the procedures used in the intervention program. At the times of the pre and post-tests, parent participants included 97 father-mother pairs (29 in the EG1, 34 in the EG2 and 34 in the CG) and 82 of these father-mother pairs at the time of the follow-up tests (24 in the EG1, 29 in the EG2 and 27 in the CG). At the time of the pre and post-tests, data were also obtained from 99 children (there were two sets of twins) 29 from the EG1, 36 from the EG2 and 34 from the CG. At the time of the pretest, these children were eight years old, on average, and 78,8% of them were in Grade 2 while the others were in Grade 1. At the time of the follow-up tests, 84 of these children were re-evaluated (24 from the EG1, 31 from the EG2 and 27 from the CG). In addition, in the first year of the study, 20 teachers (85% of whom had completed university studies) participated in the pre and pos-test phases and a second set of 12 teachers (all of whom had completed university studies) participated in the follow-up phase, given that the children had advanced to the next grade between the post-test and the follow-up. Data were collected with children from three different, public elementary-schools. The intervention program was conducted with the parents during 12 weekly sessions that were 90 120 minutes long, with the GE1 fathers and GE2 mothers. To address the objectives of this study: (a) the parents evaluated their work conditions, their personal and family wellbeing and their social skills repertoire; (b) both parents and their child evaluated the father s level of involvement as a parent; (c) the children s academic achievement, self concept and social skills were assessed; (d) both parents evaluated their child s behavior problems and social skills repertoire; (e) the teachers evaluated the children s academic achievement, behavior problems and social skills, and (f) the fathers from the EG1 and the mothers from the EG2 evaluated the intervention program. Statistical testes (ANOVA and MANOVA) were used to compare the data obtained in the three different phases of the study, for each of the three different types of informants (parents, children and teachers). Pearson correlations were used to examine the bivariate relationships among these variables. With respect to the first objective, comparisons of the results on the pre and post-intervention tests revealed that the fathers in the EG1 were significantly less stressed and there was a significant decrease in the number of disagreeable behaviors that their children presented; both the GE1 and GE2 fathers presented greater satisfaction with respect to their family-role performance, higher frequency of communication with their child, greater frequency of participation in school, cultural and leisure activities with their child, greater participation in school meetings concerning their child, more frequent contact with their child s teacher and listed a greater number of their child s behaviors that pleased them. In terms of the children s gains, a comparison of the pre and post-test results indicate that children in the EG1 presented: (a) higher scores on the Academic Achievement Test (AAT) with respect to the reading sub-test and their overall score, along with higher teacher evaluations of their academic performance; (b) a lower number of internalizing behavior problems (according to their fathers), externalizing and total problems (according to both parents); (c) social skills that were more adequate with respect to self control (for both self and father ratings) and self defense (according to the teachers), and (d) more positive teacher evaluations, across various indicators. Similarly, in comparison with the pre-test, on the post-test, children in the EG2 presented: (a) higher scores on the Academic Achievement Test (AAT) with respect to the reading sub-test and their overall score, along with higher teacher evaluations of their academic performance; (b) a lower number of externalizing and total problems (according to both parents); (c) social skills that were more adequate with respect to Cooperativeness and Self control (according to their fathers) Assertiveness in their coping strategies (according to their mothers), and Cooperation with peers (according to the teachers), and (d) more positive teacher evaluations, across various indicators. The majority of the gains obtained by the fathers and their children by the end of the intervention program were maintained or further improved at the time of the follow-up tests, with the exception of the children s self-evaluations of their social skills on the Self control factor, for which there was a significant decline between the post-test and follow-up test. With respect to the third objective, father involvement was significantly correlated with the children s academic performance, self concept, externalizing behavior problems and social skills, and measures involving the children were significantly inter-correlated. Finally, in general, the intervention program helped the fathers (EG1) and mothers (EG2) in bringing up their children. For example, some parents (22,2%) commented that it became easier for them to deal with the difficulties of parenting, while others (19%) were better able to handle their children s behavior problems, occurring either at home or at school. The parents attributed various important contributions to the intervention program: 27% changed their parenting behaviors, 19% were giving greater importance to their child s opinions and 15.9% commented that their child was more obedient. With respect to the parents acquisition of new social educational skills, 31.7% said that they learned about the importance of respecting their child s opinion and 30.2% said that they learned to set limits for their children. These results indicate the importance of educational interventions for maximizing parental involvement and, as a consequence, improving their children s social emotional development and classroom behavior.
Desenvolvimento de catalisadores para reforma e oxidação combinadas do metano
(Universidade Federal de São Carlos, 2009-03-20)
Silva, Tatiana de Freitas
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Assaf, José Mansur
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https://lattes.cnpq.br/9563312407691130
;
https://lattes.cnpq.br/4435205814755218
In this work, we studied the effects of the promoters of support (ZrO2, La2O3, CeO2, CeO2-ZrO2, CeO2-ZrO2-La2O3 and La2O3) in the nickel catalysts supported on γ-Al2O3 were studied. The supports were prepared by wet impregnation on γ- Al2O3 (Alfa Aesar) with 10% by weight of oxides of cerium, zirconium, lanthanum, ceria-zirconia, ceria-lanthanum and lanthanum-zirconium. The addition of nickel was performed by impregnation of the supports using an aqueous solution of Ni(NO3)2.6H2O (Fluka), followed by drying at 373 K for 24 hours and calcined in synthetic air (80 ml / min) at 823 K for 5 h. The samples were characterized by dispersive spectroscopy X-ray (EDX), analysis of BET, X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed Desorption (TPD), and temperature programmed oxidation (TPO). The catalysts were studied for steam reforming, partial oxidation and oxidative reforming of methane. For steam reforming, the catalysts that have two promoters and the catalyst NiLaAl presented the highest catalytic activities. In the partial oxidation the values of conversion of methane produced by different catalysts are similar. In the oxidative reforming the catalysts that have only one type of promoter and the catalyst NiCeLaAl, above 500 º C showed the best catalytic performance.
Existência de múltiplas soluções para classes de problemas elípticos com função peso mudando de sinal em domínios ilimitados
(Universidade Federal de São Carlos, 2009-03-20)
Miotto, Márcio Luís
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Miyagaki, Olímpio Hiroshi
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https://lattes.cnpq.br/2646698407526867
The aim of this work is to give some suficient conditions for the existence and multiplicity of the solutions for a class of elliptic problems with sign-changing weight function in unbounded domains, using for this variational techniques. Specifically, in the semilinear case we use the minimization arguments on the Nehari manifold. For the quasilinear case, as in the scalar case as in the system, we use the minimization arguments and a variant of the mountain pass Theorem without the Palais-Smale condition.
Habilidades sociais em profissionais com deficiência incluídos em ambiente organizacional: estudos de caso
(Universidade Federal de São Carlos, 2009-03-23)
Carvalho, Thaiz Angelino
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Almeida, Maria Amélia
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https://lattes.cnpq.br/0524792810001029
Existência de padrões com difusibilidade variável e condição de fronteira de Neumann não linear
(Universidade Federal de São Carlos, 2009-03-24)
Sônego, Maicon
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Nascimento, Arnaldo Simal do
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https://lattes.cnpq.br/6609243657130387
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https://lattes.cnpq.br/4425077751075680
In this work we study a reaction-difusion problem with nonlinear Neumann boundary condition. The objective is to present suficient conditions on the diffusion coeficient so that the problem has an stable nonconstant equilibrium solution. The main tools are some basic results of real analysis, techniques of variational calculus and properties of dynamical systems.
Pecuária leiteira: estudo de caso de transição agroecológica na Agrovila V do Assentamento Pirituba II Itapeva (SP)
(Universidade Federal de São Carlos, 2009-03-24)
Canholi, Patricia Fracarolli
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Costa, Manoel Baltasar Baptista da
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https://lattes.cnpq.br/4748534388515487
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https://lattes.cnpq.br/7961695550663129
This article discusses the ongoing agroecological transition process of dairy cattle raising in Agrovillage V of Pirituba II settlement, for which educational and methodological references have been used, all of them compatible with a sustainable rural development. The small family farming settlement is located in the mid-south region of São Paulo state, between Itapeva and Itaberá and its main activities are dairy cattle raising and conventional grain crops (corn and beans) farming. The agroecological transition was set out in 2003, as a result of interactive actions between the settled ranchers and students of Timbó Agroecology Group. Through adaptation of zootechnical and agroecological criteria to Agrovillage V dairy cattle raising, this study aims to contribute to (i) increase in environmental quality, as well as in (ii) increase in pastures and cattle productivity and (iii) socialization of the agroecological experiences of both the settled family farmers and the local rural producers. As a hypothesis, it is expected that the agrosystems biological balance is gradually reestablished, followed by gradual reduction in production costs and increase in production rates. As preliminary results, it is possible to point out that the references in use in the agroecological transition are not only contributing to the understanding of ecological principles applied to dairy cattle raising, but also to the implementation of practices, such as: isolation of Permanent Conservation Areas (APP) bordering pastures, recovery of degraded pasture areas, adoption of phytotherapic drugs to prevent mastitis, and adoption of daily sanitary procedures.
Estudo da fauna de Hymenoptera parasitóides associados a hortas orgânicas e da utilização de extratos vegetais no controle de Plutella xylostella (Lepidoptera, Plutellidae)
(Universidade Federal de São Carlos, 2009-03-25)
Onody, Helena Carolina
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Dias, Angélica Maria Penteado Martins
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https://lattes.cnpq.br/8637344058859147
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https://lattes.cnpq.br/4570932641664551
This work aimed to study the Hymenoptera parasitoids fauna in organic crops areas and the insecticidal activity of plant extracts from Allamanda cathartica (Apocynaceae) and Coriandrum sativum (Apiaceae) and the latex of Euphorbia milii (Euphorbiaceae) on Plutella xylostella (Lepidoptera, Plutellidae). During March 2006 to February 2007 twelve samples were performed using Malaise traps in each of the three studied organic crop areas. Immature Lepidoptera were also collected to verify the emergence of parasitoids. A total of 46,231 specimens, identified in 28 families were collected by Malaise trap. The most representative were Braconidae and Ichneumonidae (Ichneumonoidea), Eulophidae, Mymaridae and Pteromalidae (Chalcidoidea), Scelionidae (Platygastroidea) and Figitidae (Cynipoidea). Twenty-two subfamilies of Braconidae were identified, Microgastrinae being the most abundant in the three locations sampled. Seventeen subfamilies of Ichneumonidae were recognized and, in the three farms, the Campopleginae and Cremastinae were the most abundant. The genera Lysiphlebus, Opius, Dolichozele and Aleiodes were the most abundant of the 81 Braconidae genus identified. The results showed that the practice organic farming has positive effects on the abundance, richness and diversity Hymenoptera parasitoids fauna, but the results varied according to taxonomic level used and the type of management performed. The Braconidae and Ichneumonidae (Ichneumonoidea), Eulophidae and Encyrtidae (Chalcidoidea) were the most important parasitoids reared from the immature Lepidoptera hosts. New information on the associations between hosts and parasitoids were obtained for Hypomicrogaster (Braconidae, Microgastrinae) parasitizing larvae of Hellula phidilealis (Lepidoptera, Pyralidae), Eiphosoma (Cremastinae, Ichneumonidae) parasitizing larvae of Diaphania hyalinata (Pyralidae, Lepidoptera) and Colpotrochia (Ichneumonidae, Metopiinae) parasitizing larvae of Spodoptera eridania (Lepidoptera, Noctuidae). The tests performed with different concentrations of Allamanda cathartica and Coriandrum sativum extracts and Euphorbia milii latex affected the larval Plutella xylostella mortality.
Processamento, caracterização e determinação do perfil de polarização do Poli(fluoreto de vinilideno)
(Universidade Federal de São Carlos, 2009-03-25)
Silva, Aline Bruna da
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Gregório Filho, Rinaldo
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https://lattes.cnpq.br/5968244801228229
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https://lattes.cnpq.br/6539169612758835
This work characterized the ferroelectric polarization of the β-PVDF differentiating the individual contributions of the orientation and the crystalline phases in the remanent polarization of the PVDF. Those contributions are not known separately, because until recently the loop hysteresi was obtained only to β- PVDF from stretching the α phase films. Unoriented films exclusively in the β phase were obtained from the crystallization of PVDF from solution with N,N-dimethyl formamide at temperatures below 70ºC, some of these films were uniaxialy stretched. Also were obtained films from the uniaxial stretching of the PVDF-α from Bemberg- Folien GmbH at 80ºC and 150ºC and still unoriented samples from Bemberg in α phase, (α+β) samples from Piezotech and β sample were obtained by electrospinning. The crystalline phase, orientation and dielectric properties of the samples were determined by differential scanning calorimetry (DSC), X-Ray diffraction, Fourier transformed infrared spectroscopy (FTIR) and dielectric spectroscopy. The ferroelectric characterization was done by ramp voltage technique, in this method the electric field is applied in the form of ramps, i.e, with the relationship dE/dt equal to a constant (k). The numbers of the voltage ramps, of same polarity or reverse, is controlled, making possible the application of an arbitrary sequence of ramps, therefore the dependence of the polarization with the field can be determined in order and obtain the hysteresis loop. Through the relation between structural and ferroelectric characteristics of the samples proved that origin of permanent polarization is in the crystalline phase. The role of the interface among amorphous and crystalline phase in the metaestable polarization of the PVDF was also studied.
Investigação do potencial alelopático de Pittosporum undulatum Vent
(Universidade Federal de São Carlos, 2009-03-26)
Carpanezzi, Fernando Bertol
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Perez, Sonia Cristina Juliano Gualtieri de Andrade
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https://lattes.cnpq.br/9973185407856723
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https://lattes.cnpq.br/4260955905318492
Pittosporum undulatum Vent., an Australian tree implicated in supression of tree recruiment in many ecosystems, is found invading secondary Araucaria forests in subtropical Brazil. The first chapter of this study aimed to investigate the role of allelopathy in the invasive proccess, accessing germination and growth of Bauhinia forficata Link. in presence of secondary metabolites from cheesewood leaves. Leachates in concentrations of 20%, 15%, 10% and 5% (w/v), extracts from dry material (10%; 7,5%; 5% and 2,5%) and coumarin solutions (2,5 mM; 1,25 mM; 0,625 mM and 0,3125 mM) were prepared. Petri-dishes germination bioassays, with countings done at each 12 hours, allowed to determinate both germinabilty and germination rate; polyethylene glicol (PEG 6000) solutions were used to evaluate osmotic effects. For seedlings growth, the three highest concentrations of each solution were tested and after seven days root and shoot lenght were measured. While germinability was only sensitive to extracts from dry material, the germination rate showed a dose-dependent curve for all solutions. In seedlings, roots were the most sensitive structure and severe morfo-anatomic anomalies were observed. The main purpose of the second chapter was to investigate the use of Pittosporum undulatum Vent. (cheesewood) leaves as a possible sustainable alternative for barnyard grass control. Leachates in concentrations of 20%; 15%; 10%; 5% and 2,5% (w/v), aqueous extracts from powdered leachated and non- eachated leaves (10%; 7,5%; 5%; 2,5% and 1,25%), coumarin solutions (2,5 mM; 1,25 mM; 0,625 mM and 0,3125 mM) and Roundup Original® according to label informations were prepared. Polyethylene glycol were also used. Both germinability and germination rate were determined by germination biossays, with countings done at each 12 hours. In growth experiments, seedlings were exposed for seven days, when root and shoot length were measured. All solutions, with exception of coumarins, caused only small inhibitory effects on germination. In relation to the growth, all treatments but control caused necrose, absence of hairs and dose-dependent lenght reduction in radicles. Hipocotiles were affected by phenolic compound, extracts from non-leachated leaves and gliphosate. Although the allelopathic effects, ecophisiological aspects relative to Pittosporum undulatum still need to be cleared before its leaves can be used as a herbicide.
Equações de BBM-Burgers generalizadas: resultados de existência e convergência de soluções
(Universidade Federal de São Carlos, 2009-03-26)
Webler, Claudete Matilde
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Kondo, Cezar Issao
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https://lattes.cnpq.br/0900348462714778