Repositório RCAAP

Brasilochondria riograndensis gen. nov., sp. nov. (Copepoda, Chondracanthidae) a parasite of the flounder, Paralichthys orbignyanus (Valenciennes, 1839), is described. The new genus has a spherical head a post-mandibular "neck" and two pairs of modified biramous legs. In these respects, it resembles Argentinochondria patagonensis Etchegoin, Timi & Sardella, 2003. In the Argentine genus, however, the bulbous head has a medial constriction and the posterior of the female lacks the lateral extensions that are present in the new genus. Pseudolernentoma brasiliensis Luque & Alves, 2003, also resembles the new genus but it lacks the lateral extensions of the trunk and the latter is cylindrical rather than flat. The second leg of the new genus is small and the endopod is shorter than the exopod. The other two genera have large second legs with subequal rami.

This article proposes to estimate the growth elasticity of poverty and inequality of poverty and decompose the change in the poverty of its main determinants: growth and poverty. So, we followed a similar methodology in Besley, Burgess and Volart (2005). We used the information from PNAD's for the years 1995 to 2007, except 2000, for measures of poverty P0, P1 and P2, with data in the panel for 27 units of the federation in Brazil. Specification tests point to an estimation with elasticities varying between states. The results indicate a large inter-state disparities in growth elasticities of poverty, where the units of the federation are also the less wealthy who have lower growth elasticity of poverty. The decomposition of poverty variation indicates only the units of the federation AP, RJ, RR, RS and SP showed elasticity effect of growth above the national average, together with further growth of national income on average (for P0). Furthermore, BA, CE, MA, MS, MT, PB, PI, RN, SE and TO show elasticity growth below the national average in conjunction with lower growth in income on the national average (for P0). Very similar result is found for P1 and P2.

This article proposes to estimate the growth elasticity of poverty and inequality of poverty and decompose the change in the poverty of its main determinants: growth and poverty. So, we followed a similar methodology in Besley, Burgess and Volart (2005). We used the information from PNAD's for the years 1995 to 2007, except 2000, for measures of poverty FGT(0), FGT(1) and FGT(2), with data in the panel for 27 units of the federation in Brazil. Specification tests point to an estimation with elasticities varying between states. The results indicate a large inter-state disparities in growth elasticities of poverty, where the units of the federation are also the less wealthy who have lower growth elasticity of poverty. The decomposition of poverty variation indicates only the units of the federation AP, RJ, RR, RS and SP showed elasticity effect of growth above the national average, together with further growth of national income on average (for FGT(0)). Furthermore, BA, CE, MA, MS, MT, PB, PI, RN, SE and TO show elasticity growth below the national average in conjunction with lower growth in income on the national average (for FGT(0)). Very similar result is found for FGT(1) and FGT(2).

Using information on US domestic financial data only, we build a stochastic discount factor—SDF— and check whether it accounts for foreign markets stylized facts that escape consumption based models. By interpreting our SDF as the projection of a pricing kernel from a fully specified model in the space of returns, our results indicate that a model that accounts for the behavior of domestic assets goes a long way toward accounting for the behavior of foreign assets prices. We address predictability issues associated with the forward premium puzzle by: i) using instruments that are known to forecast excess returns in the moments restrictions associated with Euler equations, and; ii) by pricing Lustig and Verdelhan (2007)’s foreign currency portfolios. Our results indicate that the relevant state variables that explain foreign-currency market asset prices are also the driving forces behind U.S. domestic assets behavior. Keywords: Equity Premium Puzzle, Forward Premium Puzzle, Return-Based Pricing Kernel.

The chemical composition of eight commercially available of gutta-percha cones brands was determined and the results correlated with the apical seal ability. These brands were: (AnalyticÔ, DentsplyÔ, DiadentÔ, MetaÔ, ObturaÔ, OdusÔ, TanariÔ and UltimateÔ). The gutta-percha cones components (ZnO, BaSO4, gutta-percha, wax and resins) were initially obtained by Frideman et al 38 method. The composition of cones was obtained by gravimetric analysis, energy-dispersive X-ray microanalysis, X-ray diffraction and elemental analysis. The gutta-percha polymer was characterized by thermal analysis (TGA and DSC), intrinsic viscosity, gel permeation chromatography, infrared and nuclear magnetic resonance. The method described by Friedman et al 38 was appropriated to quantify gutta-percha and resin/wax components of cones, but led to overestimation of barium sulphate and zinc oxide. An average increase in the amount of barium sulfate of 3.5% in relation to the corrected BaSO4 mass value and of 43.6% in relation to cone mass was observed. Gutta-percha content range from 14.5 to 20.4% and zinc oxide from 62.8 to 84.3%. Barium sulphate was not detected in three of these brands (DentsplyÔ, OdusÔ and TanariÔ). TGA analysis shows that the inorganic residue obtained in this technique is similar of the inorganic residues observed in the gravimetric analysis. Crystal phases of gutta-percha polymer were identified by DSC. AnalyticÔ, DiadentÔ, MetaÔ, ObturaÔ, OdusÔ and TanariÔ brands presents endothermic peak characteristic of b-guttapercha. In the other two brands the polymer is present in the a-phase. Molar mass determination by viscometric analysis shows similar values of seven brands in the average of 1.0 x 105 to 1.6 x 105 g/mol, however the polymer present in the TanariÔ brand has lower molar mass (5.6 x 104 g/mol). Similar results were obtained by GPC. 11 The polymer present in the eight brands were analysed by IV and NMR, transpolyisoprene was identified as the main polymer component in the gutta-percha cones. The infiltration results of five brands (DentsplyÔ, TanariÔ, ObturaÔ, OdusÔ and AnalyticÔ ) indicates that the small amount of gutta percha and also the presence of the a-phase in the DentsplyÔ brand may be responsible for the high infiltration observed. A poor sealing ability was observed for brands with gutta-percha content lower than 16%.

This paper explores the link between environmental policy and economic growth by employing an extension of the AK Growth Model. We include a state equation for renewable natural resources. We assume that the change in environmental regulations induces costs and that economic agents also derive some utility from capital stock accumulation vis-`a-vis the environment. Using the Hopf bifurcation theorem, we show that cyclical environmental policy strategies are optimal, providing theoretical support for the Environmental Kuznets Curve.

The development of alloys that are resistant to corrosion and good wear resistance led to several studies on the electrodeposition field. With the intention of carry out alloys with good mechanic properties, associated to a high corrosion resistance, Zn-Mn alloys have been frequently studied in the last years, once they offer better anticorrosive characteristics when compared to metallic zinc films, usually used in the conventional industry. This work aimed obtain and characterize Zn-Mn alloy electrodeposited on platinum electrode and metallic cooper from solutions composed by sulfate salts from the metals previously mentioned. Zn-Mn alloys were studied by using of cyclic and linear voltammetry, and also chronoamperommetry, in which all samples were obtained in bath without agitation, room temperature, 25º C, on different current densities. The physical and morphological structure of the alloys that have been obtained were analyzed by using technique such as scanning electronic microscopy (SEM) and X-ray dispersive energy (XDE), varying parameters such as: current density applied, pH, deposition temperature and reagents concentration in the bath. In order to analyze the chemical structure of the species formed on the alloy mentioned, a x-ray diffraction (XRD) technique was used with the samples obtained in cooper electrode. From the results obtained through voltammetric analyses, it is possible to determine the potential of reduction and oxidation of Zn-Mn alloy, which occurred separately to zinc and manganese. It was possible to observe that the manganese in the alloy appears as the oxide and the zinc as an isolated metal. Through XRD analysis, it was possible to determine the phases in which the Zn-Mn species appears in the alloy, and also isolated zinc and manganese. The best results were obtained when was applied 10mA.cm-2 current density; pH 6,0; room temperature and 1:1 proportion of zinc and manganese in the electrolytic bath.

The scientific and technological advances and changes that occur in society impose the need for a comprehensive initial training, as well as a constant improvement of those that are directly linked to the teaching-learning process. Thus, the technical and scientific knowledge related to chemistry and life sciences and the field of knowledge and teaching strategies, is to add features and discussions related to specific students. It is argued in this paper, the need to expand teacher training focused on the theme of education for children, youth and adults with disabilities - specifically the education of the deaf. It is known that the teacher acts in the neurobiological changes that produce learning, but the vast majority know how the brain works, what the specific needs and activities should be planned to enable the success of the process, even in deaf students, that have specific characteristics, especially language. This study was conducted in four public schools in the state of Fortaleza. Interviews were conducted with 10 teachers and 10 interpreters, and the application of two neuropsychological tests (Rey and NEUPSILIN) to 60 students (40 deaf and 20 listeners). As a result, there was the unpreparedness of teachers to work with this audience, noticeable by the absence of specific methodologies and the difficulty of interaction, since the teachers do not master the language, in addition to sign language for lack of terms specific to the disciplines of biology and chemistry. As for the interpreters were able to identify a specific area related to the unpreparedness of the subjects of Biology and Chemistry, and an exhaustive workload. This result revealed the gap between these professionals. With regard to students, the tests indicated that the perception and memory of deaf students are subtly than the standards specified in the tests. While students in the audience, the tests indicated a small gap of perception and memory. It is believed that this knowledge provides the teacher input into the development of strategies to facilitate the learning of deaf students, respecting their characteristics, in addition to direct a constant reflection of the practice, which may lead to effecting the necessary changes, thus providing improvement in the training of professionals and thus in education.

In this work we performed ab initio calculations on two drugs, benzonidazole and mebendazole, used on the treatment of parasitic infections. The calculations were divided into obtaining the vibrational modes Raman and infrared spectra, molecular dynamics and calculation of the potential energy distribution. We developed the software PEDCALC to calculate the potential energy distribution and classify the vibrational modes. The classification of the vibrational modes is done by comparing the calculated spectra with experimental spectra and the potential energy distribution. We showed that software PEDCALC can produce accurate results of the potential energy distribution, and it is essential tool in the classification of vibrational modes of any molecule. We performed molecular dynamics calculations in the dimer of mebendazole to show the exchange of hydrogen atoms between its monomers, so we observed the dynamics of the tautomerism of this molecule.

This master's thesis investigated the flows of material and information among participants of the supply chain of pre-fabricated wooden doors. The Brazilian literature on the topic presents different studies on supply chain mapping, however, few of them discuss issues related to supply chains on the country's Northeastern region. The supply chain investigated was choosen based on previous research projects carried out by the Grupo de Pesquisa e Assessoria em Gerenciamento na Construção Civil (GERCON), a construction management research group at the Federal University of Ceará, Brazil. Previous studies carried out by GERCON researchers, on low-income housing projects, had revealed numerous problems related to wooden doors and windows. Using the results of previous studies as a starting point, this thesis studied the pre-fabricated wooden doors and their supply chain which have all of its components pre-assembled by the supplier. The use of pre-fabricated wooden doors would theoretically reduce the number of activities performed at the construction site, and would result in a shorter installation time. The two-phase research comprised a preliminary study and two in-depth case studies about pre-fabricated wooden doors. The author carried out the case studies in two high rising buildings (one residential and one commercial) in the city of Fortaleza, Brazil, in order to investigate the supply chain of pre-fabricated wooden doors. Value stream maps were developed based on direct observation of the processes involved to fabricate and install the product at the supplier‟s plant and the construction site respectively, photos, and interviews with different professionals at the plant and at the site. Wooden doors presented problems related to the installation and final product quality regardless of the type of project. Some advantages of prefabricated elements were lost due lack of trust between contractors and suppliers, lack of consideration of preconditions necessary for successful site installation, and lack of standardization and tolerance management resulted in suboptimal solutions during the installation phase. Special attention should be paid to the interfaces between the prefabricated element and the other parts of the project, current means and methods should be revisited if the project is to fully take advantage of prefabrication. The lack of open communication and low levels of trust amongst the supply chain actors result in enormous amounts of waste (e.g., rework, wasted time, unnecessary handling, unnecessary use of resources) and diminished value to the client.

The structural and thermal decomposition properties of Mg-Fe and Co-Cu-Fe hy-drotalcites (HT) have been studied through thermogravimetric analysis, X ray powder diffraction (XRD), Fourier transform infrared spectroscopy and 57Fe MÄossbauer spectroscopy. In the Mg-Fe system, the destruction of the layered structure took place at about 300 oC. The broad peaks observed in the X ray diffractograms suggests that the resultant oxides constitute a solid solution. For samples treated at temperatures higher than 500 oC the formation of the MgO and MgFe2O4 formation of the MgO and MgFe2O4 spinel phases is observed. 57Fe MÄossbauer spectroscopy was employed to monitor the Fe chemical environment for the samples annealed at different temperatures (100-900 oC). In situ XRD experiments revealed that the HTs start an interlayer contraction at about 180 oC. This phenomenon is identifed as being due to a grafting process for which the interlamellar anions attach to the layers through a covalent bond. The reconstruction of the Mg-Fe HTs was also investigated and its e±ciency depends on the thermal annealing temperature and on the Mg/Fe ratio. The structure of the reconstructed samples was found to be exactly the same as the parent structure. The in situ 57Fe MÄossbauer experiments were performed in the 100-500 oC temperature range con¯rm an increasing structural disorder in this temperature range. The quadrupolar splitting indicates that the maximum disorder occurs at 300 oC. Regarding the Co-Cu-Fe ternary system we have observed that due to the strong Jahn-Teller e®ect the Cu-Fe layered system is stabilized only in the presence of Co2+. At low Co2+ contents, additional phases are segregated in the solids. X ray patterns di®raction The structural and thermal decomposition properties of Mg-Fe and Co-Cu-Fe hydrotalcites (HT) have been studied through thermogravimetric analysis, X ray powder diffraction (XRD), Fourier transform infrared spectroscopy and 57Fe Mossbauer spectroscopy. In the Mg-Fe system, the destruction of the layered structure took place at about 300 oC. The broad peaks observed in the X ray diffractograms suggests that the resultant oxides constitute a solid solution. For samples treated at temperatures higher than 500 oC the formation of the MgO and MgFe2O4 formation of the MgO and MgFe2O4 spinel phases is observed. 57Fe Mossbauer spectroscopy was employed to monitor the Fe chemical environment for the samples annealed at different temperatures (100-900 oC). In situ XRD experiments revealed that the HTs start an interlayer contraction at about 180 oC. This phenomenon is identified as being due to a grafting process for which the interlamellar anions attach to the layers through a covalent bond. The reconstruction of the Mg-Fe HTs was also investigated and its efficiency depends on the thermal annealing temperature and on the Mg/Fe ratio. The structure of the reconstructed samples was found to be exactly the same as the parent structure. The in situ 57Fe Mossbauer experiments were performed in the 100-500 oC temperature range confirm an increasing structural disorder in this temperature range. The quadrupolar splitting indicates that the maximum disorder occurs at 300 oC. Regarding the Co-Cu-Fe ternary system we have observed that due to the strong Jahn-Teller effect the Cu-Fe layered system is stabilized only in the presence of Co2+. At low Co2+ contents, additional phases are segregated in the solids. X ray patterns diffraction show the presence of Cu(OH)2 and CuO. The decomposition process was investigated by in situ X ray, in situ Mossbauer and FTIR experiments. By increasing the temperature from 25 oC up to 180 oC we observed that the structural disorder increases. This effect has been likely attributed to the Co 2+ to Co3+ oxidation since thermal decomposition was carried out under static air atmosphere. Part of the Co3+ cations could migrate to the interlayer region, thus forming a metastable compound that still has a layered structure. Collapse of the layered structure was observed at about 200 oC. By further increasing the temperature the system becomes more crystalline and the formation of Co3O4 is observed in the X ray patterns. In Cu-rich HT, some of the carbonate anions are released at temperatures higher than 550 oC and this phenomenon is attributed to the formation of a carbonate-rich phase. The specific surface area data present its highest values in the temperature range where the collapse of the layered structure takes place.

In Brazilian roadways, which concentrate 96.2% of the passengers and 61.8% of the cargo, it is clear the deterioration of asphalt pavements caused by an increasing volume and weight of the vehicle loadings. This configuration strongly contributes to pavement distresses, specially rutting and fatigue cracking. On another hand, the State of Ceará shows a lack of paved roadways, with only 16.0% of paved roads. The Stone Matrix Asphalt (SMA) mixture appeared a few years ago as a solution for minimizing distresses on roadways with high traffic levels. Some researches, however, demonstrate that SMA mixtures with small Nominal Maximum Aggregate Sizes (NMAS) offer similar performances to SMA mixtures with usual NMAS. The objective of the present research was to design SMA mixtures with different gradations in order to study some characteristics of this type of mixture, investigating the effect (i) of the NMAS, (ii) of the percentage of aggregate passing in sieve N. 4 (4.75mm) for 12.5mm NMAS SMA mixtures and (iii) of the compaction type (Marshall × Superpave) on the mechanical behavior of the mixtures. The mixtures were evaluated by (i) resilient modulus, (ii) indirect tensile strength, (iii) fatigue life (stress controlled), (iv) resistance to moisture damage and (v) Cantabro abrasion. The results support the idea that SMA mixtures with small NMAS behave similar to those with usual NMAS. Furthermore, the 4.75mm NMAS SMA appears to be a potential solution for roadways in Ceará, considering the traffic configuration of this state.

The present work shows the study of the ultrasound irradiation influence in the electrodeposition of Ni-Fe coatings. The electrocatalytic performance of these coatings for the hydrogen evolution reaction (her) in alkaline medium was also evaluated. The Ni-Fe coatings were obtained from plating solutions containing 0.06 mol.dm-3 Ni2SO4.6H2O, 0.48 mol.dm-3 Na3C3H5O7.2H2O, 0.71 mol.dm-3 Na2CO3 and 0.16 mol.dm-3 (bath 1) and 0.04 mol.dm-3 FeSO4.7H2O (bath 2). It was also added 8.4 mL L-1 H2SO4 to maintain the pH below 1. The electrodepositions were carried out under galvanostatic control in the range of 10 mA cm-2 to 50 mA cm-2, at room temperature (≈ 28ºC) and at 55ºC in the presence and in the absence of ultrasound irradiation. All coatings were deposited on disk mild steel substrate with an exposed geometric area of 0.7 cm2. The hydrogen evolution reaction was studied in 0.5 mol.dm-3 NaOH. In all electrochemical experiments Pt was the auxiliary electrode and Hg/HgO, OH- (0,5 mol.dm-3) was the reference one. The coatings ware characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV) and the electrocatalytic properties of the Ni-Fe coating were evaluated by Tafel polarization and long-term performance tests. The results showed that the use of the ultrasound irradiation leads to an increase of the Fe content in the electrodeposits. Additionally, the coatings obtained in presence of ultrasound also present the best performance for her.

The interest for the electroplating of CuNi and its multiple layers is proportionate to the properties of these materials, such as: mechanical resistance to corrosion, mechanical (high tractive force, malleability and ductility) and magnetic properties, beyond its catalytic properties. The voltammetric results suggest that CuNi is electroplated, forming a solid solution. By cyclic voltammetry, the influence of different electrolytic bath in the electroplating of CuNi was investigated, where if it observed the formation of more noble alloys in sulphate baths and tartarate and less noble alloys in citrate and citrate/tartarate medium. Hydrodynamic experiments had been carried through, where it was verified for CuNi in sulphate and tartarate a transport of diffusional mass; for CuNi in citrate and citrate/tartarate was not observed the formation of diffusional plateau, suggesting a transport of mass by charge transference. By dispersive energy of rays-X, the atomic percentage of the constituent of the alloy was determined, where CuNi alloy in sulphate bath and tartarate present a percentage of nickel about 20% and in citrate and citrate/tartarate medium, the percentage of nickel falls espectively for 2% and 4%. By spectrometry of absorption of UV-Vis it was calculated the _ values for individual metals and CuNi, being found low values, indicating that as much the individual metals as the alloy in the different electrolytic transitions d-d type. It was made a comparative study between the electrochemical techniques (Linear Sweep Voltammetry, Chronoamperometry) and Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), for copper determination. The copper taxes determined for both methods are near, presenting small variations, where the gotten errors are distributed in a random way presenting an average value of 2,56%. The carried through statistical tests had shown that the gotten results are in a reliable band of 95%. Based in these results it is possible to affirm that the used electrochemical techniques are efficient in the copper determination, making possible, thus, the validation of these for ICP-OES.

The Productive Arrangements (PAs) when promoting specific sectors of economies are common in the world, this fact is justified by the imposition of global market witch is more competitive annually. Governments and companies has endeavored efforts and resources in collaboration and cooperation among regional players. However, the existing techniques to analyze the development generated by these policies are inefficient. In this context, was developed a methodology for monitoring and benchmarking of PAs. This methodology has the aims monitoring the companies’ development on the PAs. With a agile and transparent communication, the stakeholders interesting at development of PAs can collaborate with each other, providing essential information for the strategic positioning of all companies that makes up a market (this strategy is called competitive benchmarking). This is an innovate method of competitive benchmarking for analyzing a set of companies grouped in links of PAs. Thus, within in the highly dynamic economy, the method allows a constant monitoring of APs to proactively to diagnose gaps. That was validated for several APs, with more than 110 companies from several states of Brazil.

Most countries in the world has been increasing the use of the natural gas, motivated by the need of an environmental and versatile energy source. However, to obtain high benefits of the natural gas use, it is necessary to spread its use through alternatives that make possible high energy efficiency. Among these alternatives, the substitution of the electricity use for heating or cooling, and the PLG use in the kitchens, as well as the supply for cogeneration systems must be emphasized. The adoption of these strategies will produce effective economical environmental returns mainly in the residential and commercial sectors, if residences and commercial establishments do have access to natural gas and also information concerning the new available technologies for operation in those small scale consumption sectors. Therefore, it is fundamental that the natural gas dealers provide better acessibility to the distribution infrastructures. Considering that the decision concerning the infrastructures implantation for distribution of natural gas is strategic, the primordial objective of this work is to build a model to minimize the costs of providing of infrastructures for natural gas distribution. For this, a mathematical model was developed using binary linear programming to indicate infrastructures to be implemented which minimize the total supply costs. The software LINGO 7.0. was used to help in the solution of the problem. Three tests of the model were run which present good reults. The model led to optimal solutions even when subjected to variations of the input parameters, proving to be efficient and flexible. These variations, considered in the different sceneries, represent real situations that may happen during the operation of natural gas distribution system.

Modified gold surface with organosulfur species, 1,4-dithiane (1,4-dt) and 4- mercaptopyridine (pyS), was studied in this work. The study was carried out using the following electrochemical techniques: linear polarization with rotate disk electrode, cyclic voltammetry, differential pulse voltammetry, electrohydrodynamic impedance and electrochemical impedance spectroscopy. Other techniques also gave support, such as, atomic force microscopy (AFM), Scanning tunneling microscopy (STM), RAMAN spectroscopy and quartz crystal microbalance (QCM). For the modified gold surface with the 1,4-dt, it was observed the decrease of the redox-active [Fe(CN)6]3- species with the increase of the immersion time of the gold electrode in the modifier solution. These results suggest that the fractional coverage increases with the modification time. The electrohydrodynamic impedance results together with the MFA and MST results suggest that this surface is partially blocked presenting defects on the formed film. The RAMAN spectra suggest that those defects can be resulting of the adsorption of the different configuration of the modifier molecules (1,4-dt) on the surface ("trans" and "gauche"). The electrochemical results about the modified gold surfaces with the molecule pyS indicate an increase of the electron transfer process with the increase of the immersion time, which suggests the loss of the covering power on the modified gold surface with this species. The AFM results agree the previous results demonstrating that this surface presents larger amount of defects for longer modification times. The frequency curves variation (ΔF) versus the immersion time indicate a mass increase on the modified gold surface with the species 1,4-dt and a process desorption for the species pyS confirming the results obtained previously.

The present work presents the development of a synthesis methodology and characterization of kaolins modified chemically, leaving of natural kaolins of the northeast area of Brazil. The kaolins were modified through procedures of removal organic matter, obtaining in a sodic way, obtaining of form amoniacal, obtaining in the acid way and collation with dimethylsulfoxide. For characterization of the kaolins obtained after all the modification, techniques of X–Ray diffraction (DRX), chemical analysis (atomic absorption), thermogravimetry (TG), differential scanning calorimetry (DSC) and infrared absorption spectroscopy (FT-IR). The results obtained through the chemical analysis and of X–Ray diffraction confirmed that the composition of the kaolins was basically kaolinite and some sludges, such as, present Mica as clay mineral joined in the gray kaolin. Through the obtained results of capacity of change cationic (CTC), it was possible to evaluate and to adapt the methodologies for the obtaining of better results. The evaluation of the thermodynamic stability of the dimethylsulfoxide inserted in the structures of the kaolins it was accomplished through thermogravimetry, tends as base the method of Ozawa, where starting from the curves TG in the reasons of heating 2, 5, 7 and 10oC.min-1, it was obtained the graph of the heating reason by the reciprocal of the temperature, later he/she took place lineal regression, soon after it was obtained the coefficient angular(B), that when substituted in the expression: ? E = -18,2045.B, it is obtained the activation energy, being this a fundamental thermodynamic parameter in the evaluation of the stability. The dimethilsulfoxide inserted in the structure of the white kaolin it demonstrated more expressive values of activation energy (Ea) in relation to the inserted in the gray kaolin, denoting like this a larger thermodynamic stability, being able to in that way a better departure material to be considered in the obtaining of adsorventes of larger efficiency.

Neste trabalho foi realizado o estudo da caracterização quimica e reologica do cimento asfaltico produzido recentemente no pais, oriundo de petroleo do Campo Fazenda Alegre, no estado do Espirito Santo. Para efeito de comparação, tambem foram estudados os asfaltos da refinaria Vale do Paraiba e os estrangeiros arabe e venezuelano. Os asfaltos foram modificados por incorporação dos polimeros SBS e EVA, e os efeitos resultantes da modificação foram avaliados. Os parâmetros investigados visaram a avaliação de problemas usuais como: deformação permanente, trincas termicas e oxidação. Os polimeros foram caracterizados atraves de termogravimetria e calorimetria exloratoria diferencial e por espectroscopia no infravermelho. Os asfaltos puros e modificados foram caracterizados por espectroscopia no infravermelho, ressonância magnetica nuclear, calorimetria exploratoria diferencial, termogravimetria e cromatografia de permeação em gel. A composição quimica foi realizada atraves do fracionamento SARA e teor de enxofre. Ensaios empiricos como ponto d amolecimento, penetração e retorno elastico tambem foram realizados. As propriedades reologicas foram avaliadas através da viscosidade absoluta e de ensaios dinâmico-mecânicos. O envelhecimento oxidativo dos asfaltos foi avaliado a partir da analise dos espectros no infravermelho e de ressonância magnética nuclear, alem da variação do modulo complexo de cisalhamento dinâmico. Observou-se que os asfaltos brasileiros diferem em relação aos teores de carbonos aromáticos, quando comparados com o asfalto árabe. Alem disso, apresentam comportamento diversos frente à presença de oxigênio. Nos asfaltos modificados pos SBS, o ensaio de calorimetria exploratória diferencial mostrou uma diminuição na transição vítrea do material. A presença do SBS aumentou a resistência do asfalto ao processo oxidativo. A adição do SBS e do EVA provocou um aumento da viscosidade do asfalto de forma não linear indicando que os polímeros não são aditivos inertes. O comportamento Newtoniano não foi verificado para os ligantes modificados. Ensaios dinâmicos-mecânicos demonstraram que o SBS elevou o grau de desempenho dos ligantes. Os ensaios com as aparas da industria de calçados (EVA), indicaram uma melhoria na elasticidade do ligante.

In this work, the [Ru(bpy)(dcbpy)(TCNQ)Cl] and [Ru(bpy)(dcbpy)(TCNE)Cl] complexes, called Ru-TCNQ and Ru-TCNE, respectively, where bpy = 2,2’- bipyridine and dcbpy = 4,4’-dicarboxy-2,2’-bipyridine, were synthesized and characterized by spectroscopy and electrochemical techniques. The absorption spectra of the Ru-TCNQ and Ru-TCNE complexes showed bands assigned to metalto-ligand charge transfer transitions (MLCT). The luminescence spectra, with excitation at the MLCT, exhibited emission with maximum of intensity at 570 and 605 nm for the Ru-TCNQ and Ru-TCNE complexes, respectively. The luminescence decay of the complexes follows a biexponential law, with the Ru-TCNQ complex showing shorter lifetime than the Ru-TCNE complex. The infrared vibrational spectra of the complexes show a larger number of nitrile stretching bands, comparatively to the free ligands of coordination. These suggesting that the TCNX compounds are coordinated to the ruthenium atom. Upon coordenation, the shifts of these bands for lower energy values are indicative of the TCNX reduced form (TCNX⋅–). These results are confirmed by EPR spectra with g = 2.007 and 2.010 for Ru-TCNQ and Ru-TCNE complexes, respectively. The degree of charge transfer (Z) for the Ru-TCNQ and Ru-TCNE compounds was evaluated as 0.66 and 0.78, respectively. The RuIII/II redox potentials of the Ru-TCNQ (0.70V) and Ru-TCNE (1.30V) compounds, shifted for more positive potentials, when compared to the starting complex, cis- [Ru(dcbpy)(bpy)Cl2] (0,67V). These results inducate that the ligands acts as π-acceptor allowing a π-back-bonding interaction which imply in a thermodynamic stability of the metal in the reduced state (RuII). The data, all together, suggest that the TCNE compound presents a higher πback-bonding interaction capability than TCNQ compound.