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Cardei P.,National Institute of Research Development for Machines | Popa N.,Polytechnic University of Bucharest | Voicu G.,Polytechnic University of Bucharest | Minciuna V.-S.,Polytechnic University of Bucharest | And 4 more authors.
Materiale Plastice | Year: 2015

The paper presents the results obtained by the authors for the mathematical modeling of the mechanical behaviour variation of the composite material with polymeric or elastomeric matrix and reinforced with protein fibers (CFP), depending on the concentration of the reinforced material. The mathematical model of the main mechanical properties of a composite material allows optimal approximation variants of material that is as close to that required in a particular field. The method proposed in this article is generally applied to the composite materials and is valid not only for the case of mechanical properties dependence of a single parameter (the concentration of a constituent) but in the case of dependence on several parameters, case in which the possibilities of achieving a favourable variant are much larger and more accurate. In the category of free parameters of the mathematical model can enter all the constituents' concentrations, but, in addition, also important are the technological parameters: temperature in the manufacturing process, the reinforced material granulation, the degree of stirring, pressure, etc.


Dumitrascu A.,National Institute of Research Development for Machines | Manea D.,National Institute of Research Development for Machines | Casandroiu T.,Polytechnic University of Bucharest
INMATEH - Agricultural Engineering | Year: 2015

The quality of phytosanitary treatments performed in crops is largely determined by how substances are sprayed on the plant, by the droplets size, the coverage of the plant and the reduction of drift phenomenon. The main elements responsible for the quality of working process of phytosanitary treatment machines are the nozzles, which are the principal elements of any sprayers. This explains the great variety of spraying systems. In this paper are detailed some theoretical issues regarding the spraying process through nozzles as the basis for experiments to be carried out using the machine for high precision application of phytosanitary treatments in orchards, MSL. Analysis and modeling of this process is achieved using as main working instrument the dimensional analysis theory.


Popa L.,National Institute of Research Development for Machines | Dragan R.,National Institute of Research Development for Machines | Lazar G.,National Institute of Research Development for Machines | Stefan V.,National Institute of Research Development for Machines
Scientific Papers of the Research Institute for Fruit Growing | Year: 2012

Need to increase the competitiveness of semi-subsistence farms, by valorisation of the fruits, led to research for designing of an equipment for sorting apples by size, in order to meet market requirement, pricing according to the size of the fruits.

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