The infusion rate of a slug of tracer into an anchor agitated 100-1iter batch mixer was characterized by a decay rate constant. This constant was then used to define a dimensionless mixing-rate number which was related to the stirrer Reynolds number. This correlationship allows the calculation of time or rotational speed needed to achieve any desired degree of uniformity of the mixture. 99mTc was used as radiotracer and the mixing process was followed by a scintillation NaI(TI) counter situated on the reactor wall near the injection point.
In this work we describe the Service Quality Multi-Agent System (SQ-MAS), a software developed using a multiagent system platform to register failures in electric power distribution networks allowing the real-time calculation of several service quality indexes supervised by the Brazilian National Electric Agency (ANEEL).We introduce some basic concepts of generic MAS in order to illustrate the complexity of the problem related with the propagation of faults across the distribution network. The main features of SQ-MAS are listed and the calculation of the monitored indexes is addressed. A case study consisting of an Operation Unit of Petrobras, at Bahia State, Brazil, is used to illustrate how the system works.
The aim of this work is to determine the porosity of concrete by means of two NDT (non-destructive testing) using digital images. In one test, the images were obtained through X-ray microtomography and for another test via digital scanner. In both of the tests, the images were processed using techniques of mathematical morphology and pixel processing. For both NDT, it was used concrete samples with 20-30 MPa of compressive strength. The results for the porosity were compared with results obtained by the standard test proposed by NBR (Norma Brasileira) 9778 (2005) showing the compatibility between two studied methods and pattern method.
In Brazil, the concrete structure is widely used in civil construction. In this field, there is a common need to reinforce the structural elements, either by increasing the load, for calculation errors, flaws in the execution or modifications of use conditions. This experimental work aims to compare two reinforcement techniques with carbon fiber blanket on reinforced concrete beams submitted to shear stress. The tests will compare the results of reinforced concrete samples without any reinforcement, with shear reinforcement using carbon fiber blanket with techniques and materials popularly spread on the market. In this case using the structural adhesive S&P 220, and with shear reinforcement using carbon fiber blanket glued with structural adhesive NVT 201E.
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