Determinação da atividade de invertase em extratos enzimáticos.

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Alternatives of state interventionism in the sugar agroindustry: Argentina and Brazil, 1880-1938

El texto propone un análisis comparativo de las diversas alternativas de intervención estatal en la agroindustria del azúcar que se implementaron en Brasil y Argentina a partir de la década de 1880. Crisis de sobreproducción, pérdida de competencia en el mercado internacional, conflictos entre diferentes actores y zonas productoras dieron origen a arreglos institucionales en los dos países que perseguían valorizar el producto, conciliar intereses y hacer previsible el comportamiento de un mercado siempre complejo. El análisis se cierra en 1937-1938 con la inauguración de la experiencia del Estado Novo en Brasil, que profundizó el intervencionismo, y el fracaso en la Argentina de un intento de aprobar una ley que habría involucrado de manera decisiva el Estado en el desarrollo azucarero.This paper proposes a comparative analysis of the various options of State intervention in the sugar agroindustry, which were implemented in Brazil and Argentina beginning in the 1880s. Overproduction crisis, loss of international competitiveness, conflicts among the various actors and production zones, all led to new institutional arrangements in each country, as they sought to increase prices, harmonize interests and bring planning to an always complex market. The analysis closes in 1937-1938 with the start of the Estado Novo experience in Brazil, which increases state intervention, and the failure, in Argentina, of the attempt to approve a law which would involve the State decisively in the development of the sugar industry.Fil: Campi, Daniel Enrique A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán; ArgentinaFil: Pinto de Moura Filho, Héctor. Associação Biblioteca de Cultura; BrasilFil: Bravo, Maria Celia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Estudios Sociales. Universidad Nacional de Tucumán. Instituto Superior de Estudios Sociales; Argentin

Sensory profiling of complex meals : the case study of baked cod with cream and duck

Sensory analysis provides important information for developing new products and improving existing ones on the market. In fact, this science appears as a link between research and the development of innovative foods and their acceptance by the consumer [1]. The main purpose of this study is to evaluate the effectiveness of sensory methodologies for profiling of complex meals such as baked cod with cream and duck rice. Evaluation was performed with two sets of eight samples of industrial cod with cream and duck rice. Two independent trained panels of 9 and 12 judges evaluated the samples according to Quantitative Descriptive Analysis (QDA). Two independent panels of 16 untrained judges applied the Flash-Profile (FP) methodology over four sessions: attribute generation; final attribute list choice; evaluation 1 and 2. Two consumer panels evaluated the overall acceptance of each set of samples, on a sequential monadic presentation. For duck rice meals, the correlation between QDA and FP was not high (RV=0,646), and consumers preferred samples characterized by rice colour intensity, amount of duck, oiliness, bacon and chorizo in the meal. For cod with cream meals, the consumers preferred the samples characterized by amount and size of the cod pieces and intensity of cod taste, with a high correlation between FP and QDA (RV=0,860). Both sensory descriptive methodologies provide us with reliable and robust data in the characterization of complex meals. The FP methodology is relevant when working with panels of consumers to the extent that allows it to use their own lexicon of attributes. The application of external preference mapping on consumers’ response to FP emerges as a quick tool, either to describe products or to be used by food companies that have difficulties in using trained assessors’ panels. References: [1] Siegrist, M. (2008) Factors influencing public acceptance of innovative food technologies and products. Trends in Food Science & Technology, 19, 603-608

Numerical evaluation of three-dimensional scarf repairs in carbon-epoxy structures

The widespread employment of carbon-epoxy laminates in high responsibility and severely loaded applications introduces an issue regarding their handling after damage. Repair of these structures should be evaluated, instead of their disposal, for cost saving and ecological purposes. Under this perspective, the availability of efficient repair methods is essential to restore the strength of the structure. The development and validation of accurate predictive tools for the repairs behaviour are also extremely important, allowing the reduction of costs and time associated to extensive test programmes. Comparing with strap repairs, scarf repairs have the advantages of a higher efficiency and the absence of aerodynamic disturbance. This work reports on a numerical study of the tensile behaviour of three-dimensional scarf repairs in carbon-epoxy structures, using a ductile adhesive (Araldite® 2015). The finite elements analysis was performed in ABAQUS® and Cohesive Zone Modelling was used for the simulation of damage onset and growth in the adhesive layer. Trapezoidal cohesive laws in each pure mode were used to account for the ductility of the specific adhesive mentioned. A parametric study was performed on the repair width and scarf angle. The use of over-laminating plies covering the repaired region at the outer or both repair surfaces was also tested as an attempt to increase the repairs efficiency. The obtained results allowed the proposal of design principles for repairing composite structures

Single-lap joints of similar and dissimilar adherends bonded with an acrylic adhesive

In this study, the tensile strength of single-lap joints (SLJs) between similar and dissimilar adherends bonded with an acrylic adhesive was evaluated experimentally and numerically. The adherend materials included polyethylene (PE), polypropylene (PP), carbon-epoxy (CFRP), and glass-polyester (GFRP) composites. The following adherend combinations were tested: PE/PE, PE/PP, PE/CFRP, PE/GFRP, PP/PP, CFRP/CFRP, and GFRP/GFRP. One of the objectives of this work was to assess the influence of the adherends stiffness on the strength of the joints since it significantly affects the peel stresses magnitude in the adhesive layer. The experimental results were also used to validate a new mixed-mode cohesive damage model developed to simulate the adhesive layer. Thus, the experimental results were compared with numerical simulations performed in ABAQUS®, including a developed mixed-mode (I+II) cohesive damage model, based on the indirect use of fracture mechanics and implemented within interface finite elements. The cohesive laws present a trapezoidal shape with an increasing stress plateau, to reproduce the behaviour of the ductile adhesive used. A good agreement was found between the experimental and numerical results

Simulation of the nucleation of the precipitate Al3Sc in an aluminum scandium alloy using molecular dynamics and kinetic Monte Carlo method

Low density, high strength to corrosion and specific strength to weight ratio are properties that made aluminum alloys excellent materials for transportation industry. A promising way to develop ultra-high strength aluminum alloys is achieved by the addition of metallic elements with low solubility in aluminum, promoting the Al3X (X = Sc) nanoparticles formation. Moreover, Al alloys have applications in the aeronautic industry due to their enhanced mechanical properties if their specific strength to weight ratio is taken into account their specific strength to weight ratio. Our goal to study Al3Sc precipitates in Al alloys nucleation.Fundação para a Ciência e a Tecnologia (FCT) - PTDC/CTM/68160/2006; PTDC/CTM/099461/2008; SFRH/BD/87641/201

How groups react to disloyalty in the context of intergroup competition: Evaluations of group deserters and defectors

Groups strongly value loyalty, especially in the context of intergroup competition. However, research has yet to investigate how groups respond to members who leave the group or join a competing outgroup. Three studies investigated groups' reactions to defectors (Experiment 1) and deserting members (Experiments 2 and 3). Experiment 1 used a minimal group paradigm to demonstrate that defectors trigger a stronger derogation of ingroup deviants than outgroup deviants vis-à-vis normative members. Experiments 2 and 3 compared group members' responses to defection versus desertion from minimal and self-assigned groups, respectively. Experiment 3 also explored an explanation for the evaluations of disloyalty. Across studies, participants evaluated normative ingroup members more positively than defectors and deserters. Outgroup deserting and defecting members were evaluated similarly. Derogation of ingroup as compared to outgroup targets emerged only for defectors. In addition, Experiment 3 demonstrated that negativity toward the outgroup was related to stronger derogation of disloyal targets. Negative outgroup attitudes trigger stricter criteria for responding to disloyalty. Directions for future research are discussed

Do we all perceive food-related wellbeing in the same way? : results from a cross-cultural

Interest in measuring consumers' perceived wellbeing in a food-related context has been growing. Understanding how foods influence consumers' perceived wellbeing can contribute to better understand eating patterns. Culture is expected to largely influence how consumers perceive food-related wellbeing. People in different cultures have different values and are exposed to different socio-economic contexts, which make them likely to consider different criteria when evaluating food-related wellbeing. In this context, the present work aimed at investigating cross-cultural differences in perceived wellbeing of food products using a new scale. A web-based study was carried with 1332 participants in seven countries: Brazil, China, France, Portugal, Spain, Uruguay and USA. A new scale to measure wellbeing in a food-related context was constructed considering results from previous studies and other wellbeing scales. The scale contained 31 statements related to six main dimensions (general, emotional, intellectual, physical, social and spiritual). Six out of nine food concepts (apple, beef, beer, broccoli, chocolate cake, coffee, fish, French fries and milk) were presented to participants following an incomplete balanced design. For each of the concepts participants rated their degree of agreement with the 31 statements using a 7-point scale. The scores of the 31 items of the scale were significantly affected by country and food concept, as well as their interaction. Using factor analysis, the items were grouped into four main factors related to physical, intellectual and emotional aspects of food consumption. The items related to physical aspects showed the greatest differences among products, followed by those related to the intellectual aspects. Average scores of the food concepts in the four factors differed among countries. The largest differences were found for the two emotional related factors. These results provide insight on how consumers perceive different dimensions of wellbeing and stress the influence of cultural differences on the conceptualization of this construct

Development of a Solar Panel Control Strategy for Tracking Maximum Power Generation / Desenvolvimento de uma estratégia de controlo de painéis solares para rastrear a produção máxima de energia

The solar panel is an essential energy conversion component of photovoltaic (PV) systems, an indispensable key for converting clean and sustainable solar energy into electricity. Over the last few years, there has been a growing demand for renewable sources due to sustainable development and global warming.  Therefore, this work  describes  the  prototype  of an electronic supervision and control system  for  the  orientation  of  a  bench  solar  panel. The developed tracker prototype has as its core an electronic circuit based on a commercial microcontroller model Tennsy 3.0, within which the control algorithm is embedded. In addition to the controller, a supervisory software was developed to monitor solar cells’ status in real-time. The supervisory showed the angle of the solar plate and values of luminosity and acquired power. Simulations results were presented to show that the amount of energy generated can   reach 37 %.