National Institute of Research Development for Machines

Bucharest, Romania

National Institute of Research Development for Machines

Bucharest, Romania
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Cota C.,National Institute of Research Development for Machines | Cioica N.,National Institute of Research Development for Machines | Filip C.,Romanian Institute of Isotopic And Molecular Technology | Fechete R.,Technical University of Cluj Napoca | And 4 more authors.
AIP Conference Proceedings | Year: 2015

The effect of the nature and the content of the plasticizers (water, glycerol) on the corn starch based biodegradable packages properties (crystalline-amorphous) and also on their degradation process after absorption of distilled water were investigated by 1H NMR relaxation and 13C CP/MAS NMR spectroscopies. For this goal, a set of 14 samples with various starch/glycerol/water (mass %) ratios were prepared and investigated after extrusion process in order to establish their crystalline or amorphous character. The composition having starch/glycerol/water 68/17/15 mass % ratio was found to have a dominant amorphous character and very similar features with a commercial specimen (USA) used for the package. It was also found that this best package is extremely degraded after just one day under water absorption. The most resistant package was that with a large content of starch (78/19.5/2.5). © 2015 AIP Publishing LLC.


Cozar O.,National Institute of Research Development for Machines | Cozar O.,Academy of Romanian Scientists | Cioica N.,National Institute of Research Development for Machines | Cota C.,National Institute of Research Development for Machines | And 2 more authors.
AIP Conference Proceedings | Year: 2017

Changes in intensity of some IR and Raman bands suggest the plasticizing - antiplasticizing effects of water and glycerol contents and a small increase of amorphous/crystalline ratio, too. The nuclear magnetic relaxation data show that the amorphous/crystalline ratio depends on amylose/amylopectin mobility and also by the place of their polymer chain segments. Thus the distributions of spin-spin (T2) relaxation times and the shift toward higher values of some T2 characteristic peaks show that the increasing of water and glycerol content in the starch package materials lead to the more mobile amylose and amylopectin polymer chain segments and the prevalence of amorphous regions in the prepared native corn starch samples. © 2017 Author(s).


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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